1. add cron module
2. add pool module
3. add tcgplayer background job
4. add card price model
This commit is contained in:
Jay 2019-01-16 16:53:08 +08:00
parent 6a41584aa2
commit 273278d322
68 changed files with 10668 additions and 5 deletions

3
go.mod
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@ -1,7 +1,7 @@
module git.trj.tw/golang/mtgbot module git.trj.tw/golang/mtgbot
require ( require (
git.trj.tw/golang/utils v0.0.0-20181219032659-b1a8bce04189 git.trj.tw/golang/utils v0.0.0-20190116070516-b266ebeb2d82
github.com/davecgh/go-spew v1.1.1 // indirect github.com/davecgh/go-spew v1.1.1 // indirect
github.com/gin-contrib/sse v0.0.0-20170109093832-22d885f9ecc7 // indirect github.com/gin-contrib/sse v0.0.0-20170109093832-22d885f9ecc7 // indirect
github.com/gin-gonic/gin v1.3.0 github.com/gin-gonic/gin v1.3.0
@ -13,6 +13,7 @@ require (
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
github.com/modern-go/reflect2 v1.0.1 // indirect github.com/modern-go/reflect2 v1.0.1 // indirect
github.com/pmezard/go-difflib v1.0.0 // indirect github.com/pmezard/go-difflib v1.0.0 // indirect
github.com/robfig/cron v0.0.0-20180505203441-b41be1df6967
github.com/stretchr/testify v1.2.2 // indirect github.com/stretchr/testify v1.2.2 // indirect
github.com/ugorji/go/codec v0.0.0-20181209151446-772ced7fd4c2 // indirect github.com/ugorji/go/codec v0.0.0-20181209151446-772ced7fd4c2 // indirect
golang.org/x/net v0.0.0-20181220203305-927f97764cc3 // indirect golang.org/x/net v0.0.0-20181220203305-927f97764cc3 // indirect

4
go.sum
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@ -1,5 +1,7 @@
git.trj.tw/golang/utils v0.0.0-20181219032659-b1a8bce04189 h1:KHFlWRVFd5NIsnnFSy090+k6kT7KRotxUPTsho6F9lk= git.trj.tw/golang/utils v0.0.0-20181219032659-b1a8bce04189 h1:KHFlWRVFd5NIsnnFSy090+k6kT7KRotxUPTsho6F9lk=
git.trj.tw/golang/utils v0.0.0-20181219032659-b1a8bce04189/go.mod h1:yE+qbsUsijCTdwsaQRkPT1CXYk7ftMzXsCaaYx/0QI0= git.trj.tw/golang/utils v0.0.0-20181219032659-b1a8bce04189/go.mod h1:yE+qbsUsijCTdwsaQRkPT1CXYk7ftMzXsCaaYx/0QI0=
git.trj.tw/golang/utils v0.0.0-20190116070516-b266ebeb2d82 h1:to19C8t9z6z4b1EMnMm8JIB4qDBCkBjEAhHH5yopSZ0=
git.trj.tw/golang/utils v0.0.0-20190116070516-b266ebeb2d82/go.mod h1:yE+qbsUsijCTdwsaQRkPT1CXYk7ftMzXsCaaYx/0QI0=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/gin-contrib/sse v0.0.0-20170109093832-22d885f9ecc7 h1:AzN37oI0cOS+cougNAV9szl6CVoj2RYwzS3DpUQNtlY= github.com/gin-contrib/sse v0.0.0-20170109093832-22d885f9ecc7 h1:AzN37oI0cOS+cougNAV9szl6CVoj2RYwzS3DpUQNtlY=
@ -26,6 +28,8 @@ github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9
github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0= github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/robfig/cron v0.0.0-20180505203441-b41be1df6967 h1:x7xEyJDP7Hv3LVgvWhzioQqbC/KtuUhTigKlH/8ehhE=
github.com/robfig/cron v0.0.0-20180505203441-b41be1df6967/go.mod h1:JGuDeoQd7Z6yL4zQhZ3OPEVHB7fL6Ka6skscFHfmt2k=
github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w= github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs= github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
github.com/ugorji/go/codec v0.0.0-20181209151446-772ced7fd4c2 h1:EICbibRW4JNKMcY+LsWmuwob+CRS1BmdRdjphAm9mH4= github.com/ugorji/go/codec v0.0.0-20181209151446-772ced7fd4c2 h1:EICbibRW4JNKMcY+LsWmuwob+CRS1BmdRdjphAm9mH4=

48
models/card_price.go Normal file
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@ -0,0 +1,48 @@
package models
import (
"errors"
"time"
)
// CardPrice -
type CardPrice struct {
Card string `db:"card" cc:"card"`
PriceN float32 `db:"price_n" cc:"price_n"`
PriceF float32 `db:"price_f" cc:"price_f"`
Ctime time.Time `db:"ctime" cc:"ctime"`
}
type InsertCardPriceOpts struct {
Data []CardPrice
}
// InsertCardPrice -
func InsertCardPrice(arg InsertCardPriceOpts) (err error) {
if len(arg.Data) == 0 {
return errors.New("data list is empty")
}
tmp := make([]CardPrice, 0, len(arg.Data))
for _, v := range arg.Data {
if len(v.Card) > 0 {
tmp = append(tmp, v)
}
}
query := `insert into "public"."card_price" ("card", "price_n", "price_f", "ctime") values `
insStr := ""
for i := 0; i < len(tmp); i++ {
if len(insStr) > 0 {
insStr += ","
}
insStr += " (:card, :price_n, :price_f, now()) "
}
_, err = x.NamedExec(query+insStr, tmp)
return
}

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@ -1,6 +1,7 @@
package models package models
import ( import (
"errors"
"fmt" "fmt"
"strings" "strings"
@ -28,6 +29,7 @@ type Cards struct {
Types []string `db:"types" cc:"types"` Types []string `db:"types" cc:"types"`
Subtypes []string `db:"subtypes" cc:"subtypes"` Subtypes []string `db:"subtypes" cc:"subtypes"`
Supertypes []string `db:"supertypes" cc:"supertypes"` Supertypes []string `db:"supertypes" cc:"supertypes"`
TCGPlayerID int `db:"tcgplayerid" cc:"tcgplayerid"`
} }
// order opts // order opts
@ -104,7 +106,7 @@ func ListCards(arg ListCardsOpts) (cards []*Cards, err error) {
arg.Offset = 0 arg.Offset = 0
} }
query := `select c.id, c.name, c.cmc, c.mana_cost, c.text, c.layout, c.image_url, c.loyalty, query := `select c.id, c.name, c.cmc, c.mana_cost, c.text, c.layout, c.image_url, c.loyalty,
c.type, c.number, c.power, c.toughness, c.set from "public"."cards" c` c.type, c.number, c.power, c.toughness, c.set, c.tcgplayerid from "public"."cards" c`
where := struct { where := struct {
Name string `db:"name"` Name string `db:"name"`
CMC float32 `db:"cmc"` CMC float32 `db:"cmc"`
@ -144,3 +146,18 @@ func ListCards(arg ListCardsOpts) (cards []*Cards, err error) {
} }
return return
} }
// GetCardByTCGPlayerIDs -
func GetCardByTCGPlayerIDs(ids []int) (cards []*Cards, err error) {
if len(ids) == 0 {
return nil, errors.New("ids list is empty")
}
query := `select c.id, c.name, c.cmc, c.mana_cost, c.text, c.layout, c.image_url, c.loyalty,
c.type, c.number, c.power, c.toughness, c.set, c.tcgplayerid from "public"."cards" c where c.tcgplayerid in (?)`
err = x.Select(&cards, query, ids)
if err != nil {
return nil, err
}
return
}

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@ -13,6 +13,7 @@ type Sets struct {
Code string `db:"code" cc:"code"` Code string `db:"code" cc:"code"`
Name string `db:"name" cc:"name"` Name string `db:"name" cc:"name"`
ReleaseDate time.Time `db:"release_date" cc:"release_date"` ReleaseDate time.Time `db:"release_date" cc:"release_date"`
TCGPlayerID int `db:"tcgplayerid" cc:"tcgplayerid"`
} }
// ListSetsOpts - // ListSetsOpts -

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@ -285,5 +285,48 @@ type TCGPlayerProductPrice struct {
// ListGroupProductPrice - // ListGroupProductPrice -
func (p *TCGPlayer) ListGroupProductPrice(groupID int) (prices []*TCGPlayerProductPrice, err error) { func (p *TCGPlayer) ListGroupProductPrice(groupID int) (prices []*TCGPlayerProductPrice, err error) {
return apiURL, err := p.getAPIURL(fmt.Sprintf("/pricing/group/%d", groupID), true)
if err != nil {
return nil, err
}
tmpStruct := struct {
TCGPlayerAPIRes
Results []*TCGPlayerProductPrice `json:"results"`
}{}
reqObj := RequestObject{
URL: apiURL,
Headers: p.getHeader(),
Method: "GET",
}
req, err := GetRequest(reqObj)
if err != nil {
return nil, err
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
respByte, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
err = json.Unmarshal(respByte, &tmpStruct)
if err != nil {
return nil, err
}
if tmpStruct.Success != true {
if len(tmpStruct.Errors) > 0 {
return nil, errors.New(tmpStruct.Errors[0])
}
return nil, errors.New("get product price fail")
}
return tmpStruct.Results, nil
} }

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@ -0,0 +1,12 @@
package background
import "github.com/robfig/cron"
var c *cron.Cron
// SetCronJob -
func SetCronJob() {
c = cron.New()
c.Start()
}

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@ -0,0 +1,108 @@
package background
import (
"git.trj.tw/golang/mtgbot/models"
"git.trj.tw/golang/mtgbot/modules/apiact"
"git.trj.tw/golang/mtgbot/modules/pool"
"git.trj.tw/golang/utils"
)
func runMTGPriceJob() {
api, err := apiact.NewTCGApi("v1.19.0")
if err != nil {
return
}
err = api.GetToken()
if err != nil {
return
}
numSets, err := models.CountSets(models.ListSetsOpts{})
if err != nil {
return
}
sets, err := models.ListSets(models.ListSetsOpts{
Limit: numSets,
})
if err != nil {
return
}
_ = sets
pool := pool.NewPool(5)
for _, set := range sets {
pool.Add()
go getPriceFromAPI(pool, api, set.TCGPlayerID)
}
pool.Wait()
}
func getPriceFromAPI(pool *pool.Pool, api *apiact.TCGPlayer, groupid int) {
defer pool.Done()
prices, err := api.ListGroupProductPrice(groupid)
if err != nil {
return
}
ids := make([]int, 0, len(prices))
type cPrice struct {
CardID string
PriceN float32
PriceF float32
}
cardMap := make(map[int]cPrice)
for _, v := range prices {
if utils.SliceIndex(len(ids), func(idx int) bool { return ids[idx] == v.ProductID }) == -1 {
ids = append(ids, v.ProductID)
}
s, ok := cardMap[v.ProductID]
if !ok {
s = cPrice{}
}
if v.SubTypeName == "Normal" {
s.PriceN = v.MidPrice
} else {
s.PriceF = v.MidPrice
}
cardMap[v.ProductID] = s
}
cards, err := models.GetCardByTCGPlayerIDs(ids)
if err != nil {
return
}
for _, v := range cards {
if s, ok := cardMap[v.TCGPlayerID]; ok {
s.CardID = v.ID
cardMap[v.TCGPlayerID] = s
}
}
insOpts := models.InsertCardPriceOpts{}
insOpts.Data = make([]models.CardPrice, 0, len(cardMap))
for _, v := range cardMap {
if len(v.CardID) > 0 {
insOpts.Data = append(insOpts.Data, models.CardPrice{
Card: v.CardID,
PriceN: v.PriceN,
PriceF: v.PriceF,
})
}
}
models.InsertCardPrice(insOpts)
return
}

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modules/pool/pool.go Normal file
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@ -0,0 +1,38 @@
package pool
import "sync"
// Pool -
type Pool struct {
queue chan bool
wg *sync.WaitGroup
}
// NewPool -
func NewPool(size int) *Pool {
if size < 1 {
size = 1
}
p := &Pool{
queue: make(chan bool, size),
wg: &sync.WaitGroup{},
}
return p
}
// Add -
func (p *Pool) Add() {
p.queue <- true
p.wg.Add(1)
}
// Done -
func (p *Pool) Done() {
<-p.queue
p.wg.Done()
}
// Wait -
func (p *Pool) Wait() {
p.wg.Wait()
}

BIN
mtgbot Executable file

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schema/20190116-1.sql Normal file
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@ -0,0 +1 @@
alter table card_price drop constraint card_price_pk;

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@ -2,7 +2,8 @@
"versions": [ "versions": [
{"file": "main.sql", "version": 1}, {"file": "main.sql", "version": 1},
{"file": "20190106-1.sql", "version": 2}, {"file": "20190106-1.sql", "version": 2},
{"file": "20190115-1.sql", "version": 3} {"file": "20190115-1.sql", "version": 3},
{"file": "20190116-1.sql", "version": 4}
], ],
"test": [] "test": []
} }

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@ -169,3 +169,13 @@ func CheckExists(filePath string, allowDir bool) bool {
} }
return true return true
} }
// SliceIndex -
func SliceIndex(limit int, predicate func(idx int) bool) int {
for i := 0; i < limit; i++ {
if predicate(i) {
return i
}
}
return -1
}

24
vendor/github.com/jmoiron/sqlx/.gitignore generated vendored Normal file
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@ -0,0 +1,24 @@
# Compiled Object files, Static and Dynamic libs (Shared Objects)
*.o
*.a
*.so
# Folders
_obj
_test
# Architecture specific extensions/prefixes
*.[568vq]
[568vq].out
*.cgo1.go
*.cgo2.c
_cgo_defun.c
_cgo_gotypes.go
_cgo_export.*
_testmain.go
*.exe
tags
environ

27
vendor/github.com/jmoiron/sqlx/.travis.yml generated vendored Normal file
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@ -0,0 +1,27 @@
# vim: ft=yaml sw=2 ts=2
language: go
# enable database services
services:
- mysql
- postgresql
# create test database
before_install:
- mysql -e 'CREATE DATABASE IF NOT EXISTS sqlxtest;'
- psql -c 'create database sqlxtest;' -U postgres
- go get github.com/mattn/goveralls
- export SQLX_MYSQL_DSN="travis:@/sqlxtest?parseTime=true"
- export SQLX_POSTGRES_DSN="postgres://postgres:@localhost/sqlxtest?sslmode=disable"
- export SQLX_SQLITE_DSN="$HOME/sqlxtest.db"
# go versions to test
go:
- "1.8"
- "1.9"
- "1.10.x"
# run tests w/ coverage
script:
- travis_retry $GOPATH/bin/goveralls -service=travis-ci

23
vendor/github.com/jmoiron/sqlx/LICENSE generated vendored Normal file
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@ -0,0 +1,23 @@
Copyright (c) 2013, Jason Moiron
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

187
vendor/github.com/jmoiron/sqlx/README.md generated vendored Normal file
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@ -0,0 +1,187 @@
# sqlx
[![Build Status](https://travis-ci.org/jmoiron/sqlx.svg?branch=master)](https://travis-ci.org/jmoiron/sqlx) [![Coverage Status](https://coveralls.io/repos/github/jmoiron/sqlx/badge.svg?branch=master)](https://coveralls.io/github/jmoiron/sqlx?branch=master) [![Godoc](http://img.shields.io/badge/godoc-reference-blue.svg?style=flat)](https://godoc.org/github.com/jmoiron/sqlx) [![license](http://img.shields.io/badge/license-MIT-red.svg?style=flat)](https://raw.githubusercontent.com/jmoiron/sqlx/master/LICENSE)
sqlx is a library which provides a set of extensions on go's standard
`database/sql` library. The sqlx versions of `sql.DB`, `sql.TX`, `sql.Stmt`,
et al. all leave the underlying interfaces untouched, so that their interfaces
are a superset on the standard ones. This makes it relatively painless to
integrate existing codebases using database/sql with sqlx.
Major additional concepts are:
* Marshal rows into structs (with embedded struct support), maps, and slices
* Named parameter support including prepared statements
* `Get` and `Select` to go quickly from query to struct/slice
In addition to the [godoc API documentation](http://godoc.org/github.com/jmoiron/sqlx),
there is also some [standard documentation](http://jmoiron.github.io/sqlx/) that
explains how to use `database/sql` along with sqlx.
## Recent Changes
* The [introduction](https://github.com/jmoiron/sqlx/pull/387) of `sql.ColumnType` sets the required minimum Go version to 1.8.
* sqlx/types.JsonText has been renamed to JSONText to follow Go naming conventions.
This breaks backwards compatibility, but it's in a way that is trivially fixable
(`s/JsonText/JSONText/g`). The `types` package is both experimental and not in
active development currently.
* Using Go 1.6 and below with `types.JSONText` and `types.GzippedText` can be _potentially unsafe_, **especially** when used with common auto-scan sqlx idioms like `Select` and `Get`. See [golang bug #13905](https://github.com/golang/go/issues/13905).
### Backwards Compatibility
There is no Go1-like promise of absolute stability, but I take the issue seriously
and will maintain the library in a compatible state unless vital bugs prevent me
from doing so. Since [#59](https://github.com/jmoiron/sqlx/issues/59) and
[#60](https://github.com/jmoiron/sqlx/issues/60) necessitated breaking behavior,
a wider API cleanup was done at the time of fixing. It's possible this will happen
in future; if it does, a git tag will be provided for users requiring the old
behavior to continue to use it until such a time as they can migrate.
## install
go get github.com/jmoiron/sqlx
## issues
Row headers can be ambiguous (`SELECT 1 AS a, 2 AS a`), and the result of
`Columns()` does not fully qualify column names in queries like:
```sql
SELECT a.id, a.name, b.id, b.name FROM foos AS a JOIN foos AS b ON a.parent = b.id;
```
making a struct or map destination ambiguous. Use `AS` in your queries
to give columns distinct names, `rows.Scan` to scan them manually, or
`SliceScan` to get a slice of results.
## usage
Below is an example which shows some common use cases for sqlx. Check
[sqlx_test.go](https://github.com/jmoiron/sqlx/blob/master/sqlx_test.go) for more
usage.
```go
package main
import (
"database/sql"
"fmt"
"log"
_ "github.com/lib/pq"
"github.com/jmoiron/sqlx"
)
var schema = `
CREATE TABLE person (
first_name text,
last_name text,
email text
);
CREATE TABLE place (
country text,
city text NULL,
telcode integer
)`
type Person struct {
FirstName string `db:"first_name"`
LastName string `db:"last_name"`
Email string
}
type Place struct {
Country string
City sql.NullString
TelCode int
}
func main() {
// this Pings the database trying to connect, panics on error
// use sqlx.Open() for sql.Open() semantics
db, err := sqlx.Connect("postgres", "user=foo dbname=bar sslmode=disable")
if err != nil {
log.Fatalln(err)
}
// exec the schema or fail; multi-statement Exec behavior varies between
// database drivers; pq will exec them all, sqlite3 won't, ymmv
db.MustExec(schema)
tx := db.MustBegin()
tx.MustExec("INSERT INTO person (first_name, last_name, email) VALUES ($1, $2, $3)", "Jason", "Moiron", "jmoiron@jmoiron.net")
tx.MustExec("INSERT INTO person (first_name, last_name, email) VALUES ($1, $2, $3)", "John", "Doe", "johndoeDNE@gmail.net")
tx.MustExec("INSERT INTO place (country, city, telcode) VALUES ($1, $2, $3)", "United States", "New York", "1")
tx.MustExec("INSERT INTO place (country, telcode) VALUES ($1, $2)", "Hong Kong", "852")
tx.MustExec("INSERT INTO place (country, telcode) VALUES ($1, $2)", "Singapore", "65")
// Named queries can use structs, so if you have an existing struct (i.e. person := &Person{}) that you have populated, you can pass it in as &person
tx.NamedExec("INSERT INTO person (first_name, last_name, email) VALUES (:first_name, :last_name, :email)", &Person{"Jane", "Citizen", "jane.citzen@example.com"})
tx.Commit()
// Query the database, storing results in a []Person (wrapped in []interface{})
people := []Person{}
db.Select(&people, "SELECT * FROM person ORDER BY first_name ASC")
jason, john := people[0], people[1]
fmt.Printf("%#v\n%#v", jason, john)
// Person{FirstName:"Jason", LastName:"Moiron", Email:"jmoiron@jmoiron.net"}
// Person{FirstName:"John", LastName:"Doe", Email:"johndoeDNE@gmail.net"}
// You can also get a single result, a la QueryRow
jason = Person{}
err = db.Get(&jason, "SELECT * FROM person WHERE first_name=$1", "Jason")
fmt.Printf("%#v\n", jason)
// Person{FirstName:"Jason", LastName:"Moiron", Email:"jmoiron@jmoiron.net"}
// if you have null fields and use SELECT *, you must use sql.Null* in your struct
places := []Place{}
err = db.Select(&places, "SELECT * FROM place ORDER BY telcode ASC")
if err != nil {
fmt.Println(err)
return
}
usa, singsing, honkers := places[0], places[1], places[2]
fmt.Printf("%#v\n%#v\n%#v\n", usa, singsing, honkers)
// Place{Country:"United States", City:sql.NullString{String:"New York", Valid:true}, TelCode:1}
// Place{Country:"Singapore", City:sql.NullString{String:"", Valid:false}, TelCode:65}
// Place{Country:"Hong Kong", City:sql.NullString{String:"", Valid:false}, TelCode:852}
// Loop through rows using only one struct
place := Place{}
rows, err := db.Queryx("SELECT * FROM place")
for rows.Next() {
err := rows.StructScan(&place)
if err != nil {
log.Fatalln(err)
}
fmt.Printf("%#v\n", place)
}
// Place{Country:"United States", City:sql.NullString{String:"New York", Valid:true}, TelCode:1}
// Place{Country:"Hong Kong", City:sql.NullString{String:"", Valid:false}, TelCode:852}
// Place{Country:"Singapore", City:sql.NullString{String:"", Valid:false}, TelCode:65}
// Named queries, using `:name` as the bindvar. Automatic bindvar support
// which takes into account the dbtype based on the driverName on sqlx.Open/Connect
_, err = db.NamedExec(`INSERT INTO person (first_name,last_name,email) VALUES (:first,:last,:email)`,
map[string]interface{}{
"first": "Bin",
"last": "Smuth",
"email": "bensmith@allblacks.nz",
})
// Selects Mr. Smith from the database
rows, err = db.NamedQuery(`SELECT * FROM person WHERE first_name=:fn`, map[string]interface{}{"fn": "Bin"})
// Named queries can also use structs. Their bind names follow the same rules
// as the name -> db mapping, so struct fields are lowercased and the `db` tag
// is taken into consideration.
rows, err = db.NamedQuery(`SELECT * FROM person WHERE first_name=:first_name`, jason)
}
```

217
vendor/github.com/jmoiron/sqlx/bind.go generated vendored Normal file
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package sqlx
import (
"bytes"
"database/sql/driver"
"errors"
"reflect"
"strconv"
"strings"
"github.com/jmoiron/sqlx/reflectx"
)
// Bindvar types supported by Rebind, BindMap and BindStruct.
const (
UNKNOWN = iota
QUESTION
DOLLAR
NAMED
AT
)
// BindType returns the bindtype for a given database given a drivername.
func BindType(driverName string) int {
switch driverName {
case "postgres", "pgx", "pq-timeouts", "cloudsqlpostgres":
return DOLLAR
case "mysql":
return QUESTION
case "sqlite3":
return QUESTION
case "oci8", "ora", "goracle":
return NAMED
case "sqlserver":
return AT
}
return UNKNOWN
}
// FIXME: this should be able to be tolerant of escaped ?'s in queries without
// losing much speed, and should be to avoid confusion.
// Rebind a query from the default bindtype (QUESTION) to the target bindtype.
func Rebind(bindType int, query string) string {
switch bindType {
case QUESTION, UNKNOWN:
return query
}
// Add space enough for 10 params before we have to allocate
rqb := make([]byte, 0, len(query)+10)
var i, j int
for i = strings.Index(query, "?"); i != -1; i = strings.Index(query, "?") {
rqb = append(rqb, query[:i]...)
switch bindType {
case DOLLAR:
rqb = append(rqb, '$')
case NAMED:
rqb = append(rqb, ':', 'a', 'r', 'g')
case AT:
rqb = append(rqb, '@', 'p')
}
j++
rqb = strconv.AppendInt(rqb, int64(j), 10)
query = query[i+1:]
}
return string(append(rqb, query...))
}
// Experimental implementation of Rebind which uses a bytes.Buffer. The code is
// much simpler and should be more resistant to odd unicode, but it is twice as
// slow. Kept here for benchmarking purposes and to possibly replace Rebind if
// problems arise with its somewhat naive handling of unicode.
func rebindBuff(bindType int, query string) string {
if bindType != DOLLAR {
return query
}
b := make([]byte, 0, len(query))
rqb := bytes.NewBuffer(b)
j := 1
for _, r := range query {
if r == '?' {
rqb.WriteRune('$')
rqb.WriteString(strconv.Itoa(j))
j++
} else {
rqb.WriteRune(r)
}
}
return rqb.String()
}
// In expands slice values in args, returning the modified query string
// and a new arg list that can be executed by a database. The `query` should
// use the `?` bindVar. The return value uses the `?` bindVar.
func In(query string, args ...interface{}) (string, []interface{}, error) {
// argMeta stores reflect.Value and length for slices and
// the value itself for non-slice arguments
type argMeta struct {
v reflect.Value
i interface{}
length int
}
var flatArgsCount int
var anySlices bool
meta := make([]argMeta, len(args))
for i, arg := range args {
if a, ok := arg.(driver.Valuer); ok {
arg, _ = a.Value()
}
v := reflect.ValueOf(arg)
t := reflectx.Deref(v.Type())
// []byte is a driver.Value type so it should not be expanded
if t.Kind() == reflect.Slice && t != reflect.TypeOf([]byte{}) {
meta[i].length = v.Len()
meta[i].v = v
anySlices = true
flatArgsCount += meta[i].length
if meta[i].length == 0 {
return "", nil, errors.New("empty slice passed to 'in' query")
}
} else {
meta[i].i = arg
flatArgsCount++
}
}
// don't do any parsing if there aren't any slices; note that this means
// some errors that we might have caught below will not be returned.
if !anySlices {
return query, args, nil
}
newArgs := make([]interface{}, 0, flatArgsCount)
buf := make([]byte, 0, len(query)+len(", ?")*flatArgsCount)
var arg, offset int
for i := strings.IndexByte(query[offset:], '?'); i != -1; i = strings.IndexByte(query[offset:], '?') {
if arg >= len(meta) {
// if an argument wasn't passed, lets return an error; this is
// not actually how database/sql Exec/Query works, but since we are
// creating an argument list programmatically, we want to be able
// to catch these programmer errors earlier.
return "", nil, errors.New("number of bindVars exceeds arguments")
}
argMeta := meta[arg]
arg++
// not a slice, continue.
// our questionmark will either be written before the next expansion
// of a slice or after the loop when writing the rest of the query
if argMeta.length == 0 {
offset = offset + i + 1
newArgs = append(newArgs, argMeta.i)
continue
}
// write everything up to and including our ? character
buf = append(buf, query[:offset+i+1]...)
for si := 1; si < argMeta.length; si++ {
buf = append(buf, ", ?"...)
}
newArgs = appendReflectSlice(newArgs, argMeta.v, argMeta.length)
// slice the query and reset the offset. this avoids some bookkeeping for
// the write after the loop
query = query[offset+i+1:]
offset = 0
}
buf = append(buf, query...)
if arg < len(meta) {
return "", nil, errors.New("number of bindVars less than number arguments")
}
return string(buf), newArgs, nil
}
func appendReflectSlice(args []interface{}, v reflect.Value, vlen int) []interface{} {
switch val := v.Interface().(type) {
case []interface{}:
args = append(args, val...)
case []int:
for i := range val {
args = append(args, val[i])
}
case []string:
for i := range val {
args = append(args, val[i])
}
default:
for si := 0; si < vlen; si++ {
args = append(args, v.Index(si).Interface())
}
}
return args
}

12
vendor/github.com/jmoiron/sqlx/doc.go generated vendored Normal file
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// Package sqlx provides general purpose extensions to database/sql.
//
// It is intended to seamlessly wrap database/sql and provide convenience
// methods which are useful in the development of database driven applications.
// None of the underlying database/sql methods are changed. Instead all extended
// behavior is implemented through new methods defined on wrapper types.
//
// Additions include scanning into structs, named query support, rebinding
// queries for different drivers, convenient shorthands for common error handling
// and more.
//
package sqlx

7
vendor/github.com/jmoiron/sqlx/go.mod generated vendored Normal file
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@ -0,0 +1,7 @@
module github.com/jmoiron/sqlx
require (
github.com/go-sql-driver/mysql v1.4.0
github.com/lib/pq v1.0.0
github.com/mattn/go-sqlite3 v1.9.0
)

6
vendor/github.com/jmoiron/sqlx/go.sum generated vendored Normal file
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@ -0,0 +1,6 @@
github.com/go-sql-driver/mysql v1.4.0 h1:7LxgVwFb2hIQtMm87NdgAVfXjnt4OePseqT1tKx+opk=
github.com/go-sql-driver/mysql v1.4.0/go.mod h1:zAC/RDZ24gD3HViQzih4MyKcchzm+sOG5ZlKdlhCg5w=
github.com/lib/pq v1.0.0 h1:X5PMW56eZitiTeO7tKzZxFCSpbFZJtkMMooicw2us9A=
github.com/lib/pq v1.0.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
github.com/mattn/go-sqlite3 v1.9.0 h1:pDRiWfl+++eC2FEFRy6jXmQlvp4Yh3z1MJKg4UeYM/4=
github.com/mattn/go-sqlite3 v1.9.0/go.mod h1:FPy6KqzDD04eiIsT53CuJW3U88zkxoIYsOqkbpncsNc=

356
vendor/github.com/jmoiron/sqlx/named.go generated vendored Normal file
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package sqlx
// Named Query Support
//
// * BindMap - bind query bindvars to map/struct args
// * NamedExec, NamedQuery - named query w/ struct or map
// * NamedStmt - a pre-compiled named query which is a prepared statement
//
// Internal Interfaces:
//
// * compileNamedQuery - rebind a named query, returning a query and list of names
// * bindArgs, bindMapArgs, bindAnyArgs - given a list of names, return an arglist
//
import (
"database/sql"
"errors"
"fmt"
"reflect"
"strconv"
"unicode"
"github.com/jmoiron/sqlx/reflectx"
)
// NamedStmt is a prepared statement that executes named queries. Prepare it
// how you would execute a NamedQuery, but pass in a struct or map when executing.
type NamedStmt struct {
Params []string
QueryString string
Stmt *Stmt
}
// Close closes the named statement.
func (n *NamedStmt) Close() error {
return n.Stmt.Close()
}
// Exec executes a named statement using the struct passed.
// Any named placeholder parameters are replaced with fields from arg.
func (n *NamedStmt) Exec(arg interface{}) (sql.Result, error) {
args, err := bindAnyArgs(n.Params, arg, n.Stmt.Mapper)
if err != nil {
return *new(sql.Result), err
}
return n.Stmt.Exec(args...)
}
// Query executes a named statement using the struct argument, returning rows.
// Any named placeholder parameters are replaced with fields from arg.
func (n *NamedStmt) Query(arg interface{}) (*sql.Rows, error) {
args, err := bindAnyArgs(n.Params, arg, n.Stmt.Mapper)
if err != nil {
return nil, err
}
return n.Stmt.Query(args...)
}
// QueryRow executes a named statement against the database. Because sqlx cannot
// create a *sql.Row with an error condition pre-set for binding errors, sqlx
// returns a *sqlx.Row instead.
// Any named placeholder parameters are replaced with fields from arg.
func (n *NamedStmt) QueryRow(arg interface{}) *Row {
args, err := bindAnyArgs(n.Params, arg, n.Stmt.Mapper)
if err != nil {
return &Row{err: err}
}
return n.Stmt.QueryRowx(args...)
}
// MustExec execs a NamedStmt, panicing on error
// Any named placeholder parameters are replaced with fields from arg.
func (n *NamedStmt) MustExec(arg interface{}) sql.Result {
res, err := n.Exec(arg)
if err != nil {
panic(err)
}
return res
}
// Queryx using this NamedStmt
// Any named placeholder parameters are replaced with fields from arg.
func (n *NamedStmt) Queryx(arg interface{}) (*Rows, error) {
r, err := n.Query(arg)
if err != nil {
return nil, err
}
return &Rows{Rows: r, Mapper: n.Stmt.Mapper, unsafe: isUnsafe(n)}, err
}
// QueryRowx this NamedStmt. Because of limitations with QueryRow, this is
// an alias for QueryRow.
// Any named placeholder parameters are replaced with fields from arg.
func (n *NamedStmt) QueryRowx(arg interface{}) *Row {
return n.QueryRow(arg)
}
// Select using this NamedStmt
// Any named placeholder parameters are replaced with fields from arg.
func (n *NamedStmt) Select(dest interface{}, arg interface{}) error {
rows, err := n.Queryx(arg)
if err != nil {
return err
}
// if something happens here, we want to make sure the rows are Closed
defer rows.Close()
return scanAll(rows, dest, false)
}
// Get using this NamedStmt
// Any named placeholder parameters are replaced with fields from arg.
func (n *NamedStmt) Get(dest interface{}, arg interface{}) error {
r := n.QueryRowx(arg)
return r.scanAny(dest, false)
}
// Unsafe creates an unsafe version of the NamedStmt
func (n *NamedStmt) Unsafe() *NamedStmt {
r := &NamedStmt{Params: n.Params, Stmt: n.Stmt, QueryString: n.QueryString}
r.Stmt.unsafe = true
return r
}
// A union interface of preparer and binder, required to be able to prepare
// named statements (as the bindtype must be determined).
type namedPreparer interface {
Preparer
binder
}
func prepareNamed(p namedPreparer, query string) (*NamedStmt, error) {
bindType := BindType(p.DriverName())
q, args, err := compileNamedQuery([]byte(query), bindType)
if err != nil {
return nil, err
}
stmt, err := Preparex(p, q)
if err != nil {
return nil, err
}
return &NamedStmt{
QueryString: q,
Params: args,
Stmt: stmt,
}, nil
}
func bindAnyArgs(names []string, arg interface{}, m *reflectx.Mapper) ([]interface{}, error) {
if maparg, ok := arg.(map[string]interface{}); ok {
return bindMapArgs(names, maparg)
}
return bindArgs(names, arg, m)
}
// private interface to generate a list of interfaces from a given struct
// type, given a list of names to pull out of the struct. Used by public
// BindStruct interface.
func bindArgs(names []string, arg interface{}, m *reflectx.Mapper) ([]interface{}, error) {
arglist := make([]interface{}, 0, len(names))
// grab the indirected value of arg
v := reflect.ValueOf(arg)
for v = reflect.ValueOf(arg); v.Kind() == reflect.Ptr; {
v = v.Elem()
}
err := m.TraversalsByNameFunc(v.Type(), names, func(i int, t []int) error {
if len(t) == 0 {
return fmt.Errorf("could not find name %s in %#v", names[i], arg)
}
val := reflectx.FieldByIndexesReadOnly(v, t)
arglist = append(arglist, val.Interface())
return nil
})
return arglist, err
}
// like bindArgs, but for maps.
func bindMapArgs(names []string, arg map[string]interface{}) ([]interface{}, error) {
arglist := make([]interface{}, 0, len(names))
for _, name := range names {
val, ok := arg[name]
if !ok {
return arglist, fmt.Errorf("could not find name %s in %#v", name, arg)
}
arglist = append(arglist, val)
}
return arglist, nil
}
// bindStruct binds a named parameter query with fields from a struct argument.
// The rules for binding field names to parameter names follow the same
// conventions as for StructScan, including obeying the `db` struct tags.
func bindStruct(bindType int, query string, arg interface{}, m *reflectx.Mapper) (string, []interface{}, error) {
bound, names, err := compileNamedQuery([]byte(query), bindType)
if err != nil {
return "", []interface{}{}, err
}
arglist, err := bindArgs(names, arg, m)
if err != nil {
return "", []interface{}{}, err
}
return bound, arglist, nil
}
// bindMap binds a named parameter query with a map of arguments.
func bindMap(bindType int, query string, args map[string]interface{}) (string, []interface{}, error) {
bound, names, err := compileNamedQuery([]byte(query), bindType)
if err != nil {
return "", []interface{}{}, err
}
arglist, err := bindMapArgs(names, args)
return bound, arglist, err
}
// -- Compilation of Named Queries
// Allow digits and letters in bind params; additionally runes are
// checked against underscores, meaning that bind params can have be
// alphanumeric with underscores. Mind the difference between unicode
// digits and numbers, where '5' is a digit but '五' is not.
var allowedBindRunes = []*unicode.RangeTable{unicode.Letter, unicode.Digit}
// FIXME: this function isn't safe for unicode named params, as a failing test
// can testify. This is not a regression but a failure of the original code
// as well. It should be modified to range over runes in a string rather than
// bytes, even though this is less convenient and slower. Hopefully the
// addition of the prepared NamedStmt (which will only do this once) will make
// up for the slightly slower ad-hoc NamedExec/NamedQuery.
// compile a NamedQuery into an unbound query (using the '?' bindvar) and
// a list of names.
func compileNamedQuery(qs []byte, bindType int) (query string, names []string, err error) {
names = make([]string, 0, 10)
rebound := make([]byte, 0, len(qs))
inName := false
last := len(qs) - 1
currentVar := 1
name := make([]byte, 0, 10)
for i, b := range qs {
// a ':' while we're in a name is an error
if b == ':' {
// if this is the second ':' in a '::' escape sequence, append a ':'
if inName && i > 0 && qs[i-1] == ':' {
rebound = append(rebound, ':')
inName = false
continue
} else if inName {
err = errors.New("unexpected `:` while reading named param at " + strconv.Itoa(i))
return query, names, err
}
inName = true
name = []byte{}
} else if inName && i > 0 && b == '=' {
rebound = append(rebound, ':', '=')
inName = false
continue
// if we're in a name, and this is an allowed character, continue
} else if inName && (unicode.IsOneOf(allowedBindRunes, rune(b)) || b == '_' || b == '.') && i != last {
// append the byte to the name if we are in a name and not on the last byte
name = append(name, b)
// if we're in a name and it's not an allowed character, the name is done
} else if inName {
inName = false
// if this is the final byte of the string and it is part of the name, then
// make sure to add it to the name
if i == last && unicode.IsOneOf(allowedBindRunes, rune(b)) {
name = append(name, b)
}
// add the string representation to the names list
names = append(names, string(name))
// add a proper bindvar for the bindType
switch bindType {
// oracle only supports named type bind vars even for positional
case NAMED:
rebound = append(rebound, ':')
rebound = append(rebound, name...)
case QUESTION, UNKNOWN:
rebound = append(rebound, '?')
case DOLLAR:
rebound = append(rebound, '$')
for _, b := range strconv.Itoa(currentVar) {
rebound = append(rebound, byte(b))
}
currentVar++
case AT:
rebound = append(rebound, '@', 'p')
for _, b := range strconv.Itoa(currentVar) {
rebound = append(rebound, byte(b))
}
currentVar++
}
// add this byte to string unless it was not part of the name
if i != last {
rebound = append(rebound, b)
} else if !unicode.IsOneOf(allowedBindRunes, rune(b)) {
rebound = append(rebound, b)
}
} else {
// this is a normal byte and should just go onto the rebound query
rebound = append(rebound, b)
}
}
return string(rebound), names, err
}
// BindNamed binds a struct or a map to a query with named parameters.
// DEPRECATED: use sqlx.Named` instead of this, it may be removed in future.
func BindNamed(bindType int, query string, arg interface{}) (string, []interface{}, error) {
return bindNamedMapper(bindType, query, arg, mapper())
}
// Named takes a query using named parameters and an argument and
// returns a new query with a list of args that can be executed by
// a database. The return value uses the `?` bindvar.
func Named(query string, arg interface{}) (string, []interface{}, error) {
return bindNamedMapper(QUESTION, query, arg, mapper())
}
func bindNamedMapper(bindType int, query string, arg interface{}, m *reflectx.Mapper) (string, []interface{}, error) {
if maparg, ok := arg.(map[string]interface{}); ok {
return bindMap(bindType, query, maparg)
}
return bindStruct(bindType, query, arg, m)
}
// NamedQuery binds a named query and then runs Query on the result using the
// provided Ext (sqlx.Tx, sqlx.Db). It works with both structs and with
// map[string]interface{} types.
func NamedQuery(e Ext, query string, arg interface{}) (*Rows, error) {
q, args, err := bindNamedMapper(BindType(e.DriverName()), query, arg, mapperFor(e))
if err != nil {
return nil, err
}
return e.Queryx(q, args...)
}
// NamedExec uses BindStruct to get a query executable by the driver and
// then runs Exec on the result. Returns an error from the binding
// or the query excution itself.
func NamedExec(e Ext, query string, arg interface{}) (sql.Result, error) {
q, args, err := bindNamedMapper(BindType(e.DriverName()), query, arg, mapperFor(e))
if err != nil {
return nil, err
}
return e.Exec(q, args...)
}

132
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// +build go1.8
package sqlx
import (
"context"
"database/sql"
)
// A union interface of contextPreparer and binder, required to be able to
// prepare named statements with context (as the bindtype must be determined).
type namedPreparerContext interface {
PreparerContext
binder
}
func prepareNamedContext(ctx context.Context, p namedPreparerContext, query string) (*NamedStmt, error) {
bindType := BindType(p.DriverName())
q, args, err := compileNamedQuery([]byte(query), bindType)
if err != nil {
return nil, err
}
stmt, err := PreparexContext(ctx, p, q)
if err != nil {
return nil, err
}
return &NamedStmt{
QueryString: q,
Params: args,
Stmt: stmt,
}, nil
}
// ExecContext executes a named statement using the struct passed.
// Any named placeholder parameters are replaced with fields from arg.
func (n *NamedStmt) ExecContext(ctx context.Context, arg interface{}) (sql.Result, error) {
args, err := bindAnyArgs(n.Params, arg, n.Stmt.Mapper)
if err != nil {
return *new(sql.Result), err
}
return n.Stmt.ExecContext(ctx, args...)
}
// QueryContext executes a named statement using the struct argument, returning rows.
// Any named placeholder parameters are replaced with fields from arg.
func (n *NamedStmt) QueryContext(ctx context.Context, arg interface{}) (*sql.Rows, error) {
args, err := bindAnyArgs(n.Params, arg, n.Stmt.Mapper)
if err != nil {
return nil, err
}
return n.Stmt.QueryContext(ctx, args...)
}
// QueryRowContext executes a named statement against the database. Because sqlx cannot
// create a *sql.Row with an error condition pre-set for binding errors, sqlx
// returns a *sqlx.Row instead.
// Any named placeholder parameters are replaced with fields from arg.
func (n *NamedStmt) QueryRowContext(ctx context.Context, arg interface{}) *Row {
args, err := bindAnyArgs(n.Params, arg, n.Stmt.Mapper)
if err != nil {
return &Row{err: err}
}
return n.Stmt.QueryRowxContext(ctx, args...)
}
// MustExecContext execs a NamedStmt, panicing on error
// Any named placeholder parameters are replaced with fields from arg.
func (n *NamedStmt) MustExecContext(ctx context.Context, arg interface{}) sql.Result {
res, err := n.ExecContext(ctx, arg)
if err != nil {
panic(err)
}
return res
}
// QueryxContext using this NamedStmt
// Any named placeholder parameters are replaced with fields from arg.
func (n *NamedStmt) QueryxContext(ctx context.Context, arg interface{}) (*Rows, error) {
r, err := n.QueryContext(ctx, arg)
if err != nil {
return nil, err
}
return &Rows{Rows: r, Mapper: n.Stmt.Mapper, unsafe: isUnsafe(n)}, err
}
// QueryRowxContext this NamedStmt. Because of limitations with QueryRow, this is
// an alias for QueryRow.
// Any named placeholder parameters are replaced with fields from arg.
func (n *NamedStmt) QueryRowxContext(ctx context.Context, arg interface{}) *Row {
return n.QueryRowContext(ctx, arg)
}
// SelectContext using this NamedStmt
// Any named placeholder parameters are replaced with fields from arg.
func (n *NamedStmt) SelectContext(ctx context.Context, dest interface{}, arg interface{}) error {
rows, err := n.QueryxContext(ctx, arg)
if err != nil {
return err
}
// if something happens here, we want to make sure the rows are Closed
defer rows.Close()
return scanAll(rows, dest, false)
}
// GetContext using this NamedStmt
// Any named placeholder parameters are replaced with fields from arg.
func (n *NamedStmt) GetContext(ctx context.Context, dest interface{}, arg interface{}) error {
r := n.QueryRowxContext(ctx, arg)
return r.scanAny(dest, false)
}
// NamedQueryContext binds a named query and then runs Query on the result using the
// provided Ext (sqlx.Tx, sqlx.Db). It works with both structs and with
// map[string]interface{} types.
func NamedQueryContext(ctx context.Context, e ExtContext, query string, arg interface{}) (*Rows, error) {
q, args, err := bindNamedMapper(BindType(e.DriverName()), query, arg, mapperFor(e))
if err != nil {
return nil, err
}
return e.QueryxContext(ctx, q, args...)
}
// NamedExecContext uses BindStruct to get a query executable by the driver and
// then runs Exec on the result. Returns an error from the binding
// or the query excution itself.
func NamedExecContext(ctx context.Context, e ExtContext, query string, arg interface{}) (sql.Result, error) {
q, args, err := bindNamedMapper(BindType(e.DriverName()), query, arg, mapperFor(e))
if err != nil {
return nil, err
}
return e.ExecContext(ctx, q, args...)
}

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# reflectx
The sqlx package has special reflect needs. In particular, it needs to:
* be able to map a name to a field
* understand embedded structs
* understand mapping names to fields by a particular tag
* user specified name -> field mapping functions
These behaviors mimic the behaviors by the standard library marshallers and also the
behavior of standard Go accessors.
The first two are amply taken care of by `Reflect.Value.FieldByName`, and the third is
addressed by `Reflect.Value.FieldByNameFunc`, but these don't quite understand struct
tags in the ways that are vital to most marshallers, and they are slow.
This reflectx package extends reflect to achieve these goals.

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// Package reflectx implements extensions to the standard reflect lib suitable
// for implementing marshalling and unmarshalling packages. The main Mapper type
// allows for Go-compatible named attribute access, including accessing embedded
// struct attributes and the ability to use functions and struct tags to
// customize field names.
//
package reflectx
import (
"reflect"
"runtime"
"strings"
"sync"
)
// A FieldInfo is metadata for a struct field.
type FieldInfo struct {
Index []int
Path string
Field reflect.StructField
Zero reflect.Value
Name string
Options map[string]string
Embedded bool
Children []*FieldInfo
Parent *FieldInfo
}
// A StructMap is an index of field metadata for a struct.
type StructMap struct {
Tree *FieldInfo
Index []*FieldInfo
Paths map[string]*FieldInfo
Names map[string]*FieldInfo
}
// GetByPath returns a *FieldInfo for a given string path.
func (f StructMap) GetByPath(path string) *FieldInfo {
return f.Paths[path]
}
// GetByTraversal returns a *FieldInfo for a given integer path. It is
// analogous to reflect.FieldByIndex, but using the cached traversal
// rather than re-executing the reflect machinery each time.
func (f StructMap) GetByTraversal(index []int) *FieldInfo {
if len(index) == 0 {
return nil
}
tree := f.Tree
for _, i := range index {
if i >= len(tree.Children) || tree.Children[i] == nil {
return nil
}
tree = tree.Children[i]
}
return tree
}
// Mapper is a general purpose mapper of names to struct fields. A Mapper
// behaves like most marshallers in the standard library, obeying a field tag
// for name mapping but also providing a basic transform function.
type Mapper struct {
cache map[reflect.Type]*StructMap
tagName string
tagMapFunc func(string) string
mapFunc func(string) string
mutex sync.Mutex
}
// NewMapper returns a new mapper using the tagName as its struct field tag.
// If tagName is the empty string, it is ignored.
func NewMapper(tagName string) *Mapper {
return &Mapper{
cache: make(map[reflect.Type]*StructMap),
tagName: tagName,
}
}
// NewMapperTagFunc returns a new mapper which contains a mapper for field names
// AND a mapper for tag values. This is useful for tags like json which can
// have values like "name,omitempty".
func NewMapperTagFunc(tagName string, mapFunc, tagMapFunc func(string) string) *Mapper {
return &Mapper{
cache: make(map[reflect.Type]*StructMap),
tagName: tagName,
mapFunc: mapFunc,
tagMapFunc: tagMapFunc,
}
}
// NewMapperFunc returns a new mapper which optionally obeys a field tag and
// a struct field name mapper func given by f. Tags will take precedence, but
// for any other field, the mapped name will be f(field.Name)
func NewMapperFunc(tagName string, f func(string) string) *Mapper {
return &Mapper{
cache: make(map[reflect.Type]*StructMap),
tagName: tagName,
mapFunc: f,
}
}
// TypeMap returns a mapping of field strings to int slices representing
// the traversal down the struct to reach the field.
func (m *Mapper) TypeMap(t reflect.Type) *StructMap {
m.mutex.Lock()
mapping, ok := m.cache[t]
if !ok {
mapping = getMapping(t, m.tagName, m.mapFunc, m.tagMapFunc)
m.cache[t] = mapping
}
m.mutex.Unlock()
return mapping
}
// FieldMap returns the mapper's mapping of field names to reflect values. Panics
// if v's Kind is not Struct, or v is not Indirectable to a struct kind.
func (m *Mapper) FieldMap(v reflect.Value) map[string]reflect.Value {
v = reflect.Indirect(v)
mustBe(v, reflect.Struct)
r := map[string]reflect.Value{}
tm := m.TypeMap(v.Type())
for tagName, fi := range tm.Names {
r[tagName] = FieldByIndexes(v, fi.Index)
}
return r
}
// FieldByName returns a field by its mapped name as a reflect.Value.
// Panics if v's Kind is not Struct or v is not Indirectable to a struct Kind.
// Returns zero Value if the name is not found.
func (m *Mapper) FieldByName(v reflect.Value, name string) reflect.Value {
v = reflect.Indirect(v)
mustBe(v, reflect.Struct)
tm := m.TypeMap(v.Type())
fi, ok := tm.Names[name]
if !ok {
return v
}
return FieldByIndexes(v, fi.Index)
}
// FieldsByName returns a slice of values corresponding to the slice of names
// for the value. Panics if v's Kind is not Struct or v is not Indirectable
// to a struct Kind. Returns zero Value for each name not found.
func (m *Mapper) FieldsByName(v reflect.Value, names []string) []reflect.Value {
v = reflect.Indirect(v)
mustBe(v, reflect.Struct)
tm := m.TypeMap(v.Type())
vals := make([]reflect.Value, 0, len(names))
for _, name := range names {
fi, ok := tm.Names[name]
if !ok {
vals = append(vals, *new(reflect.Value))
} else {
vals = append(vals, FieldByIndexes(v, fi.Index))
}
}
return vals
}
// TraversalsByName returns a slice of int slices which represent the struct
// traversals for each mapped name. Panics if t is not a struct or Indirectable
// to a struct. Returns empty int slice for each name not found.
func (m *Mapper) TraversalsByName(t reflect.Type, names []string) [][]int {
r := make([][]int, 0, len(names))
m.TraversalsByNameFunc(t, names, func(_ int, i []int) error {
if i == nil {
r = append(r, []int{})
} else {
r = append(r, i)
}
return nil
})
return r
}
// TraversalsByNameFunc traverses the mapped names and calls fn with the index of
// each name and the struct traversal represented by that name. Panics if t is not
// a struct or Indirectable to a struct. Returns the first error returned by fn or nil.
func (m *Mapper) TraversalsByNameFunc(t reflect.Type, names []string, fn func(int, []int) error) error {
t = Deref(t)
mustBe(t, reflect.Struct)
tm := m.TypeMap(t)
for i, name := range names {
fi, ok := tm.Names[name]
if !ok {
if err := fn(i, nil); err != nil {
return err
}
} else {
if err := fn(i, fi.Index); err != nil {
return err
}
}
}
return nil
}
// FieldByIndexes returns a value for the field given by the struct traversal
// for the given value.
func FieldByIndexes(v reflect.Value, indexes []int) reflect.Value {
for _, i := range indexes {
v = reflect.Indirect(v).Field(i)
// if this is a pointer and it's nil, allocate a new value and set it
if v.Kind() == reflect.Ptr && v.IsNil() {
alloc := reflect.New(Deref(v.Type()))
v.Set(alloc)
}
if v.Kind() == reflect.Map && v.IsNil() {
v.Set(reflect.MakeMap(v.Type()))
}
}
return v
}
// FieldByIndexesReadOnly returns a value for a particular struct traversal,
// but is not concerned with allocating nil pointers because the value is
// going to be used for reading and not setting.
func FieldByIndexesReadOnly(v reflect.Value, indexes []int) reflect.Value {
for _, i := range indexes {
v = reflect.Indirect(v).Field(i)
}
return v
}
// Deref is Indirect for reflect.Types
func Deref(t reflect.Type) reflect.Type {
if t.Kind() == reflect.Ptr {
t = t.Elem()
}
return t
}
// -- helpers & utilities --
type kinder interface {
Kind() reflect.Kind
}
// mustBe checks a value against a kind, panicing with a reflect.ValueError
// if the kind isn't that which is required.
func mustBe(v kinder, expected reflect.Kind) {
if k := v.Kind(); k != expected {
panic(&reflect.ValueError{Method: methodName(), Kind: k})
}
}
// methodName returns the caller of the function calling methodName
func methodName() string {
pc, _, _, _ := runtime.Caller(2)
f := runtime.FuncForPC(pc)
if f == nil {
return "unknown method"
}
return f.Name()
}
type typeQueue struct {
t reflect.Type
fi *FieldInfo
pp string // Parent path
}
// A copying append that creates a new slice each time.
func apnd(is []int, i int) []int {
x := make([]int, len(is)+1)
for p, n := range is {
x[p] = n
}
x[len(x)-1] = i
return x
}
type mapf func(string) string
// parseName parses the tag and the target name for the given field using
// the tagName (eg 'json' for `json:"foo"` tags), mapFunc for mapping the
// field's name to a target name, and tagMapFunc for mapping the tag to
// a target name.
func parseName(field reflect.StructField, tagName string, mapFunc, tagMapFunc mapf) (tag, fieldName string) {
// first, set the fieldName to the field's name
fieldName = field.Name
// if a mapFunc is set, use that to override the fieldName
if mapFunc != nil {
fieldName = mapFunc(fieldName)
}
// if there's no tag to look for, return the field name
if tagName == "" {
return "", fieldName
}
// if this tag is not set using the normal convention in the tag,
// then return the fieldname.. this check is done because according
// to the reflect documentation:
// If the tag does not have the conventional format,
// the value returned by Get is unspecified.
// which doesn't sound great.
if !strings.Contains(string(field.Tag), tagName+":") {
return "", fieldName
}
// at this point we're fairly sure that we have a tag, so lets pull it out
tag = field.Tag.Get(tagName)
// if we have a mapper function, call it on the whole tag
// XXX: this is a change from the old version, which pulled out the name
// before the tagMapFunc could be run, but I think this is the right way
if tagMapFunc != nil {
tag = tagMapFunc(tag)
}
// finally, split the options from the name
parts := strings.Split(tag, ",")
fieldName = parts[0]
return tag, fieldName
}
// parseOptions parses options out of a tag string, skipping the name
func parseOptions(tag string) map[string]string {
parts := strings.Split(tag, ",")
options := make(map[string]string, len(parts))
if len(parts) > 1 {
for _, opt := range parts[1:] {
// short circuit potentially expensive split op
if strings.Contains(opt, "=") {
kv := strings.Split(opt, "=")
options[kv[0]] = kv[1]
continue
}
options[opt] = ""
}
}
return options
}
// getMapping returns a mapping for the t type, using the tagName, mapFunc and
// tagMapFunc to determine the canonical names of fields.
func getMapping(t reflect.Type, tagName string, mapFunc, tagMapFunc mapf) *StructMap {
m := []*FieldInfo{}
root := &FieldInfo{}
queue := []typeQueue{}
queue = append(queue, typeQueue{Deref(t), root, ""})
QueueLoop:
for len(queue) != 0 {
// pop the first item off of the queue
tq := queue[0]
queue = queue[1:]
// ignore recursive field
for p := tq.fi.Parent; p != nil; p = p.Parent {
if tq.fi.Field.Type == p.Field.Type {
continue QueueLoop
}
}
nChildren := 0
if tq.t.Kind() == reflect.Struct {
nChildren = tq.t.NumField()
}
tq.fi.Children = make([]*FieldInfo, nChildren)
// iterate through all of its fields
for fieldPos := 0; fieldPos < nChildren; fieldPos++ {
f := tq.t.Field(fieldPos)
// parse the tag and the target name using the mapping options for this field
tag, name := parseName(f, tagName, mapFunc, tagMapFunc)
// if the name is "-", disabled via a tag, skip it
if name == "-" {
continue
}
fi := FieldInfo{
Field: f,
Name: name,
Zero: reflect.New(f.Type).Elem(),
Options: parseOptions(tag),
}
// if the path is empty this path is just the name
if tq.pp == "" {
fi.Path = fi.Name
} else {
fi.Path = tq.pp + "." + fi.Name
}
// skip unexported fields
if len(f.PkgPath) != 0 && !f.Anonymous {
continue
}
// bfs search of anonymous embedded structs
if f.Anonymous {
pp := tq.pp
if tag != "" {
pp = fi.Path
}
fi.Embedded = true
fi.Index = apnd(tq.fi.Index, fieldPos)
nChildren := 0
ft := Deref(f.Type)
if ft.Kind() == reflect.Struct {
nChildren = ft.NumField()
}
fi.Children = make([]*FieldInfo, nChildren)
queue = append(queue, typeQueue{Deref(f.Type), &fi, pp})
} else if fi.Zero.Kind() == reflect.Struct || (fi.Zero.Kind() == reflect.Ptr && fi.Zero.Type().Elem().Kind() == reflect.Struct) {
fi.Index = apnd(tq.fi.Index, fieldPos)
fi.Children = make([]*FieldInfo, Deref(f.Type).NumField())
queue = append(queue, typeQueue{Deref(f.Type), &fi, fi.Path})
}
fi.Index = apnd(tq.fi.Index, fieldPos)
fi.Parent = tq.fi
tq.fi.Children[fieldPos] = &fi
m = append(m, &fi)
}
}
flds := &StructMap{Index: m, Tree: root, Paths: map[string]*FieldInfo{}, Names: map[string]*FieldInfo{}}
for _, fi := range flds.Index {
flds.Paths[fi.Path] = fi
if fi.Name != "" && !fi.Embedded {
flds.Names[fi.Path] = fi
}
}
return flds
}

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// +build go1.8
package sqlx
import (
"context"
"database/sql"
"fmt"
"io/ioutil"
"path/filepath"
"reflect"
)
// ConnectContext to a database and verify with a ping.
func ConnectContext(ctx context.Context, driverName, dataSourceName string) (*DB, error) {
db, err := Open(driverName, dataSourceName)
if err != nil {
return db, err
}
err = db.PingContext(ctx)
return db, err
}
// QueryerContext is an interface used by GetContext and SelectContext
type QueryerContext interface {
QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
QueryxContext(ctx context.Context, query string, args ...interface{}) (*Rows, error)
QueryRowxContext(ctx context.Context, query string, args ...interface{}) *Row
}
// PreparerContext is an interface used by PreparexContext.
type PreparerContext interface {
PrepareContext(ctx context.Context, query string) (*sql.Stmt, error)
}
// ExecerContext is an interface used by MustExecContext and LoadFileContext
type ExecerContext interface {
ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error)
}
// ExtContext is a union interface which can bind, query, and exec, with Context
// used by NamedQueryContext and NamedExecContext.
type ExtContext interface {
binder
QueryerContext
ExecerContext
}
// SelectContext executes a query using the provided Queryer, and StructScans
// each row into dest, which must be a slice. If the slice elements are
// scannable, then the result set must have only one column. Otherwise,
// StructScan is used. The *sql.Rows are closed automatically.
// Any placeholder parameters are replaced with supplied args.
func SelectContext(ctx context.Context, q QueryerContext, dest interface{}, query string, args ...interface{}) error {
rows, err := q.QueryxContext(ctx, query, args...)
if err != nil {
return err
}
// if something happens here, we want to make sure the rows are Closed
defer rows.Close()
return scanAll(rows, dest, false)
}
// PreparexContext prepares a statement.
//
// The provided context is used for the preparation of the statement, not for
// the execution of the statement.
func PreparexContext(ctx context.Context, p PreparerContext, query string) (*Stmt, error) {
s, err := p.PrepareContext(ctx, query)
if err != nil {
return nil, err
}
return &Stmt{Stmt: s, unsafe: isUnsafe(p), Mapper: mapperFor(p)}, err
}
// GetContext does a QueryRow using the provided Queryer, and scans the
// resulting row to dest. If dest is scannable, the result must only have one
// column. Otherwise, StructScan is used. Get will return sql.ErrNoRows like
// row.Scan would. Any placeholder parameters are replaced with supplied args.
// An error is returned if the result set is empty.
func GetContext(ctx context.Context, q QueryerContext, dest interface{}, query string, args ...interface{}) error {
r := q.QueryRowxContext(ctx, query, args...)
return r.scanAny(dest, false)
}
// LoadFileContext exec's every statement in a file (as a single call to Exec).
// LoadFileContext may return a nil *sql.Result if errors are encountered
// locating or reading the file at path. LoadFile reads the entire file into
// memory, so it is not suitable for loading large data dumps, but can be useful
// for initializing schemas or loading indexes.
//
// FIXME: this does not really work with multi-statement files for mattn/go-sqlite3
// or the go-mysql-driver/mysql drivers; pq seems to be an exception here. Detecting
// this by requiring something with DriverName() and then attempting to split the
// queries will be difficult to get right, and its current driver-specific behavior
// is deemed at least not complex in its incorrectness.
func LoadFileContext(ctx context.Context, e ExecerContext, path string) (*sql.Result, error) {
realpath, err := filepath.Abs(path)
if err != nil {
return nil, err
}
contents, err := ioutil.ReadFile(realpath)
if err != nil {
return nil, err
}
res, err := e.ExecContext(ctx, string(contents))
return &res, err
}
// MustExecContext execs the query using e and panics if there was an error.
// Any placeholder parameters are replaced with supplied args.
func MustExecContext(ctx context.Context, e ExecerContext, query string, args ...interface{}) sql.Result {
res, err := e.ExecContext(ctx, query, args...)
if err != nil {
panic(err)
}
return res
}
// PrepareNamedContext returns an sqlx.NamedStmt
func (db *DB) PrepareNamedContext(ctx context.Context, query string) (*NamedStmt, error) {
return prepareNamedContext(ctx, db, query)
}
// NamedQueryContext using this DB.
// Any named placeholder parameters are replaced with fields from arg.
func (db *DB) NamedQueryContext(ctx context.Context, query string, arg interface{}) (*Rows, error) {
return NamedQueryContext(ctx, db, query, arg)
}
// NamedExecContext using this DB.
// Any named placeholder parameters are replaced with fields from arg.
func (db *DB) NamedExecContext(ctx context.Context, query string, arg interface{}) (sql.Result, error) {
return NamedExecContext(ctx, db, query, arg)
}
// SelectContext using this DB.
// Any placeholder parameters are replaced with supplied args.
func (db *DB) SelectContext(ctx context.Context, dest interface{}, query string, args ...interface{}) error {
return SelectContext(ctx, db, dest, query, args...)
}
// GetContext using this DB.
// Any placeholder parameters are replaced with supplied args.
// An error is returned if the result set is empty.
func (db *DB) GetContext(ctx context.Context, dest interface{}, query string, args ...interface{}) error {
return GetContext(ctx, db, dest, query, args...)
}
// PreparexContext returns an sqlx.Stmt instead of a sql.Stmt.
//
// The provided context is used for the preparation of the statement, not for
// the execution of the statement.
func (db *DB) PreparexContext(ctx context.Context, query string) (*Stmt, error) {
return PreparexContext(ctx, db, query)
}
// QueryxContext queries the database and returns an *sqlx.Rows.
// Any placeholder parameters are replaced with supplied args.
func (db *DB) QueryxContext(ctx context.Context, query string, args ...interface{}) (*Rows, error) {
r, err := db.DB.QueryContext(ctx, query, args...)
if err != nil {
return nil, err
}
return &Rows{Rows: r, unsafe: db.unsafe, Mapper: db.Mapper}, err
}
// QueryRowxContext queries the database and returns an *sqlx.Row.
// Any placeholder parameters are replaced with supplied args.
func (db *DB) QueryRowxContext(ctx context.Context, query string, args ...interface{}) *Row {
rows, err := db.DB.QueryContext(ctx, query, args...)
return &Row{rows: rows, err: err, unsafe: db.unsafe, Mapper: db.Mapper}
}
// MustBeginTx starts a transaction, and panics on error. Returns an *sqlx.Tx instead
// of an *sql.Tx.
//
// The provided context is used until the transaction is committed or rolled
// back. If the context is canceled, the sql package will roll back the
// transaction. Tx.Commit will return an error if the context provided to
// MustBeginContext is canceled.
func (db *DB) MustBeginTx(ctx context.Context, opts *sql.TxOptions) *Tx {
tx, err := db.BeginTxx(ctx, opts)
if err != nil {
panic(err)
}
return tx
}
// MustExecContext (panic) runs MustExec using this database.
// Any placeholder parameters are replaced with supplied args.
func (db *DB) MustExecContext(ctx context.Context, query string, args ...interface{}) sql.Result {
return MustExecContext(ctx, db, query, args...)
}
// BeginTxx begins a transaction and returns an *sqlx.Tx instead of an
// *sql.Tx.
//
// The provided context is used until the transaction is committed or rolled
// back. If the context is canceled, the sql package will roll back the
// transaction. Tx.Commit will return an error if the context provided to
// BeginxContext is canceled.
func (db *DB) BeginTxx(ctx context.Context, opts *sql.TxOptions) (*Tx, error) {
tx, err := db.DB.BeginTx(ctx, opts)
if err != nil {
return nil, err
}
return &Tx{Tx: tx, driverName: db.driverName, unsafe: db.unsafe, Mapper: db.Mapper}, err
}
// StmtxContext returns a version of the prepared statement which runs within a
// transaction. Provided stmt can be either *sql.Stmt or *sqlx.Stmt.
func (tx *Tx) StmtxContext(ctx context.Context, stmt interface{}) *Stmt {
var s *sql.Stmt
switch v := stmt.(type) {
case Stmt:
s = v.Stmt
case *Stmt:
s = v.Stmt
case *sql.Stmt:
s = v
default:
panic(fmt.Sprintf("non-statement type %v passed to Stmtx", reflect.ValueOf(stmt).Type()))
}
return &Stmt{Stmt: tx.StmtContext(ctx, s), Mapper: tx.Mapper}
}
// NamedStmtContext returns a version of the prepared statement which runs
// within a transaction.
func (tx *Tx) NamedStmtContext(ctx context.Context, stmt *NamedStmt) *NamedStmt {
return &NamedStmt{
QueryString: stmt.QueryString,
Params: stmt.Params,
Stmt: tx.StmtxContext(ctx, stmt.Stmt),
}
}
// PreparexContext returns an sqlx.Stmt instead of a sql.Stmt.
//
// The provided context is used for the preparation of the statement, not for
// the execution of the statement.
func (tx *Tx) PreparexContext(ctx context.Context, query string) (*Stmt, error) {
return PreparexContext(ctx, tx, query)
}
// PrepareNamedContext returns an sqlx.NamedStmt
func (tx *Tx) PrepareNamedContext(ctx context.Context, query string) (*NamedStmt, error) {
return prepareNamedContext(ctx, tx, query)
}
// MustExecContext runs MustExecContext within a transaction.
// Any placeholder parameters are replaced with supplied args.
func (tx *Tx) MustExecContext(ctx context.Context, query string, args ...interface{}) sql.Result {
return MustExecContext(ctx, tx, query, args...)
}
// QueryxContext within a transaction and context.
// Any placeholder parameters are replaced with supplied args.
func (tx *Tx) QueryxContext(ctx context.Context, query string, args ...interface{}) (*Rows, error) {
r, err := tx.Tx.QueryContext(ctx, query, args...)
if err != nil {
return nil, err
}
return &Rows{Rows: r, unsafe: tx.unsafe, Mapper: tx.Mapper}, err
}
// SelectContext within a transaction and context.
// Any placeholder parameters are replaced with supplied args.
func (tx *Tx) SelectContext(ctx context.Context, dest interface{}, query string, args ...interface{}) error {
return SelectContext(ctx, tx, dest, query, args...)
}
// GetContext within a transaction and context.
// Any placeholder parameters are replaced with supplied args.
// An error is returned if the result set is empty.
func (tx *Tx) GetContext(ctx context.Context, dest interface{}, query string, args ...interface{}) error {
return GetContext(ctx, tx, dest, query, args...)
}
// QueryRowxContext within a transaction and context.
// Any placeholder parameters are replaced with supplied args.
func (tx *Tx) QueryRowxContext(ctx context.Context, query string, args ...interface{}) *Row {
rows, err := tx.Tx.QueryContext(ctx, query, args...)
return &Row{rows: rows, err: err, unsafe: tx.unsafe, Mapper: tx.Mapper}
}
// NamedExecContext using this Tx.
// Any named placeholder parameters are replaced with fields from arg.
func (tx *Tx) NamedExecContext(ctx context.Context, query string, arg interface{}) (sql.Result, error) {
return NamedExecContext(ctx, tx, query, arg)
}
// SelectContext using the prepared statement.
// Any placeholder parameters are replaced with supplied args.
func (s *Stmt) SelectContext(ctx context.Context, dest interface{}, args ...interface{}) error {
return SelectContext(ctx, &qStmt{s}, dest, "", args...)
}
// GetContext using the prepared statement.
// Any placeholder parameters are replaced with supplied args.
// An error is returned if the result set is empty.
func (s *Stmt) GetContext(ctx context.Context, dest interface{}, args ...interface{}) error {
return GetContext(ctx, &qStmt{s}, dest, "", args...)
}
// MustExecContext (panic) using this statement. Note that the query portion of
// the error output will be blank, as Stmt does not expose its query.
// Any placeholder parameters are replaced with supplied args.
func (s *Stmt) MustExecContext(ctx context.Context, args ...interface{}) sql.Result {
return MustExecContext(ctx, &qStmt{s}, "", args...)
}
// QueryRowxContext using this statement.
// Any placeholder parameters are replaced with supplied args.
func (s *Stmt) QueryRowxContext(ctx context.Context, args ...interface{}) *Row {
qs := &qStmt{s}
return qs.QueryRowxContext(ctx, "", args...)
}
// QueryxContext using this statement.
// Any placeholder parameters are replaced with supplied args.
func (s *Stmt) QueryxContext(ctx context.Context, args ...interface{}) (*Rows, error) {
qs := &qStmt{s}
return qs.QueryxContext(ctx, "", args...)
}
func (q *qStmt) QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error) {
return q.Stmt.QueryContext(ctx, args...)
}
func (q *qStmt) QueryxContext(ctx context.Context, query string, args ...interface{}) (*Rows, error) {
r, err := q.Stmt.QueryContext(ctx, args...)
if err != nil {
return nil, err
}
return &Rows{Rows: r, unsafe: q.Stmt.unsafe, Mapper: q.Stmt.Mapper}, err
}
func (q *qStmt) QueryRowxContext(ctx context.Context, query string, args ...interface{}) *Row {
rows, err := q.Stmt.QueryContext(ctx, args...)
return &Row{rows: rows, err: err, unsafe: q.Stmt.unsafe, Mapper: q.Stmt.Mapper}
}
func (q *qStmt) ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error) {
return q.Stmt.ExecContext(ctx, args...)
}

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.db
*.test
*~
*.swp

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#!/bin/bash
set -eu
client_configure() {
sudo chmod 600 $PQSSLCERTTEST_PATH/postgresql.key
}
pgdg_repository() {
local sourcelist='sources.list.d/postgresql.list'
curl -sS 'https://www.postgresql.org/media/keys/ACCC4CF8.asc' | sudo apt-key add -
echo deb http://apt.postgresql.org/pub/repos/apt/ $(lsb_release -cs)-pgdg main $PGVERSION | sudo tee "/etc/apt/$sourcelist"
sudo apt-get -o Dir::Etc::sourcelist="$sourcelist" -o Dir::Etc::sourceparts='-' -o APT::Get::List-Cleanup='0' update
}
postgresql_configure() {
sudo tee /etc/postgresql/$PGVERSION/main/pg_hba.conf > /dev/null <<-config
local all all trust
hostnossl all pqgossltest 127.0.0.1/32 reject
hostnossl all pqgosslcert 127.0.0.1/32 reject
hostssl all pqgossltest 127.0.0.1/32 trust
hostssl all pqgosslcert 127.0.0.1/32 cert
host all all 127.0.0.1/32 trust
hostnossl all pqgossltest ::1/128 reject
hostnossl all pqgosslcert ::1/128 reject
hostssl all pqgossltest ::1/128 trust
hostssl all pqgosslcert ::1/128 cert
host all all ::1/128 trust
config
xargs sudo install -o postgres -g postgres -m 600 -t /var/lib/postgresql/$PGVERSION/main/ <<-certificates
certs/root.crt
certs/server.crt
certs/server.key
certificates
sort -VCu <<-versions ||
$PGVERSION
9.2
versions
sudo tee -a /etc/postgresql/$PGVERSION/main/postgresql.conf > /dev/null <<-config
ssl_ca_file = 'root.crt'
ssl_cert_file = 'server.crt'
ssl_key_file = 'server.key'
config
echo 127.0.0.1 postgres | sudo tee -a /etc/hosts > /dev/null
sudo service postgresql restart
}
postgresql_install() {
xargs sudo apt-get -y -o Dpkg::Options::='--force-confdef' -o Dpkg::Options::='--force-confnew' install <<-packages
postgresql-$PGVERSION
postgresql-server-dev-$PGVERSION
postgresql-contrib-$PGVERSION
packages
}
postgresql_uninstall() {
sudo service postgresql stop
xargs sudo apt-get -y --purge remove <<-packages
libpq-dev
libpq5
postgresql
postgresql-client-common
postgresql-common
packages
sudo rm -rf /var/lib/postgresql
}
megacheck_install() {
# Lock megacheck version at $MEGACHECK_VERSION to prevent spontaneous
# new error messages in old code.
go get -d honnef.co/go/tools/...
git -C $GOPATH/src/honnef.co/go/tools/ checkout $MEGACHECK_VERSION
go install honnef.co/go/tools/cmd/megacheck
megacheck --version
}
golint_install() {
go get github.com/golang/lint/golint
}
$1

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language: go
go:
- 1.8.x
- 1.9.x
- 1.10.x
- master
sudo: true
env:
global:
- PGUSER=postgres
- PQGOSSLTESTS=1
- PQSSLCERTTEST_PATH=$PWD/certs
- PGHOST=127.0.0.1
- MEGACHECK_VERSION=2017.2.2
matrix:
- PGVERSION=10
- PGVERSION=9.6
- PGVERSION=9.5
- PGVERSION=9.4
- PGVERSION=9.3
- PGVERSION=9.2
- PGVERSION=9.1
- PGVERSION=9.0
before_install:
- ./.travis.sh postgresql_uninstall
- ./.travis.sh pgdg_repository
- ./.travis.sh postgresql_install
- ./.travis.sh postgresql_configure
- ./.travis.sh client_configure
- ./.travis.sh megacheck_install
- ./.travis.sh golint_install
- go get golang.org/x/tools/cmd/goimports
before_script:
- createdb pqgotest
- createuser -DRS pqgossltest
- createuser -DRS pqgosslcert
script:
- >
goimports -d -e $(find -name '*.go') | awk '{ print } END { exit NR == 0 ? 0 : 1 }'
- go vet ./...
- megacheck -go 1.8 ./...
- golint ./...
- PQTEST_BINARY_PARAMETERS=no go test -race -v ./...
- PQTEST_BINARY_PARAMETERS=yes go test -race -v ./...

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## Contributing to pq
`pq` has a backlog of pull requests, but contributions are still very
much welcome. You can help with patch review, submitting bug reports,
or adding new functionality. There is no formal style guide, but
please conform to the style of existing code and general Go formatting
conventions when submitting patches.
### Patch review
Help review existing open pull requests by commenting on the code or
proposed functionality.
### Bug reports
We appreciate any bug reports, but especially ones with self-contained
(doesn't depend on code outside of pq), minimal (can't be simplified
further) test cases. It's especially helpful if you can submit a pull
request with just the failing test case (you'll probably want to
pattern it after the tests in
[conn_test.go](https://github.com/lib/pq/blob/master/conn_test.go).
### New functionality
There are a number of pending patches for new functionality, so
additional feature patches will take a while to merge. Still, patches
are generally reviewed based on usefulness and complexity in addition
to time-in-queue, so if you have a knockout idea, take a shot. Feel
free to open an issue discussion your proposed patch beforehand.

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Copyright (c) 2011-2013, 'pq' Contributors
Portions Copyright (C) 2011 Blake Mizerany
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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# pq - A pure Go postgres driver for Go's database/sql package
[![GoDoc](https://godoc.org/github.com/lib/pq?status.svg)](https://godoc.org/github.com/lib/pq)
[![Build Status](https://travis-ci.org/lib/pq.svg?branch=master)](https://travis-ci.org/lib/pq)
## Install
go get github.com/lib/pq
## Docs
For detailed documentation and basic usage examples, please see the package
documentation at <http://godoc.org/github.com/lib/pq>.
## Tests
`go test` is used for testing. See [TESTS.md](TESTS.md) for more details.
## Features
* SSL
* Handles bad connections for `database/sql`
* Scan `time.Time` correctly (i.e. `timestamp[tz]`, `time[tz]`, `date`)
* Scan binary blobs correctly (i.e. `bytea`)
* Package for `hstore` support
* COPY FROM support
* pq.ParseURL for converting urls to connection strings for sql.Open.
* Many libpq compatible environment variables
* Unix socket support
* Notifications: `LISTEN`/`NOTIFY`
* pgpass support
## Future / Things you can help with
* Better COPY FROM / COPY TO (see discussion in #181)
## Thank you (alphabetical)
Some of these contributors are from the original library `bmizerany/pq.go` whose
code still exists in here.
* Andy Balholm (andybalholm)
* Ben Berkert (benburkert)
* Benjamin Heatwole (bheatwole)
* Bill Mill (llimllib)
* Bjørn Madsen (aeons)
* Blake Gentry (bgentry)
* Brad Fitzpatrick (bradfitz)
* Charlie Melbye (cmelbye)
* Chris Bandy (cbandy)
* Chris Gilling (cgilling)
* Chris Walsh (cwds)
* Dan Sosedoff (sosedoff)
* Daniel Farina (fdr)
* Eric Chlebek (echlebek)
* Eric Garrido (minusnine)
* Eric Urban (hydrogen18)
* Everyone at The Go Team
* Evan Shaw (edsrzf)
* Ewan Chou (coocood)
* Fazal Majid (fazalmajid)
* Federico Romero (federomero)
* Fumin (fumin)
* Gary Burd (garyburd)
* Heroku (heroku)
* James Pozdena (jpoz)
* Jason McVetta (jmcvetta)
* Jeremy Jay (pbnjay)
* Joakim Sernbrant (serbaut)
* John Gallagher (jgallagher)
* Jonathan Rudenberg (titanous)
* Joël Stemmer (jstemmer)
* Kamil Kisiel (kisielk)
* Kelly Dunn (kellydunn)
* Keith Rarick (kr)
* Kir Shatrov (kirs)
* Lann Martin (lann)
* Maciek Sakrejda (uhoh-itsmaciek)
* Marc Brinkmann (mbr)
* Marko Tiikkaja (johto)
* Matt Newberry (MattNewberry)
* Matt Robenolt (mattrobenolt)
* Martin Olsen (martinolsen)
* Mike Lewis (mikelikespie)
* Nicolas Patry (Narsil)
* Oliver Tonnhofer (olt)
* Patrick Hayes (phayes)
* Paul Hammond (paulhammond)
* Ryan Smith (ryandotsmith)
* Samuel Stauffer (samuel)
* Timothée Peignier (cyberdelia)
* Travis Cline (tmc)
* TruongSinh Tran-Nguyen (truongsinh)
* Yaismel Miranda (ympons)
* notedit (notedit)

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# Tests
## Running Tests
`go test` is used for testing. A running PostgreSQL
server is required, with the ability to log in. The
database to connect to test with is "pqgotest," on
"localhost" but these can be overridden using [environment
variables](https://www.postgresql.org/docs/9.3/static/libpq-envars.html).
Example:
PGHOST=/run/postgresql go test
## Benchmarks
A benchmark suite can be run as part of the tests:
go test -bench .
## Example setup (Docker)
Run a postgres container:
```
docker run --expose 5432:5432 postgres
```
Run tests:
```
PGHOST=localhost PGPORT=5432 PGUSER=postgres PGSSLMODE=disable PGDATABASE=postgres go test
```

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package pq
import (
"bytes"
"database/sql"
"database/sql/driver"
"encoding/hex"
"fmt"
"reflect"
"strconv"
"strings"
)
var typeByteSlice = reflect.TypeOf([]byte{})
var typeDriverValuer = reflect.TypeOf((*driver.Valuer)(nil)).Elem()
var typeSQLScanner = reflect.TypeOf((*sql.Scanner)(nil)).Elem()
// Array returns the optimal driver.Valuer and sql.Scanner for an array or
// slice of any dimension.
//
// For example:
// db.Query(`SELECT * FROM t WHERE id = ANY($1)`, pq.Array([]int{235, 401}))
//
// var x []sql.NullInt64
// db.QueryRow('SELECT ARRAY[235, 401]').Scan(pq.Array(&x))
//
// Scanning multi-dimensional arrays is not supported. Arrays where the lower
// bound is not one (such as `[0:0]={1}') are not supported.
func Array(a interface{}) interface {
driver.Valuer
sql.Scanner
} {
switch a := a.(type) {
case []bool:
return (*BoolArray)(&a)
case []float64:
return (*Float64Array)(&a)
case []int64:
return (*Int64Array)(&a)
case []string:
return (*StringArray)(&a)
case *[]bool:
return (*BoolArray)(a)
case *[]float64:
return (*Float64Array)(a)
case *[]int64:
return (*Int64Array)(a)
case *[]string:
return (*StringArray)(a)
}
return GenericArray{a}
}
// ArrayDelimiter may be optionally implemented by driver.Valuer or sql.Scanner
// to override the array delimiter used by GenericArray.
type ArrayDelimiter interface {
// ArrayDelimiter returns the delimiter character(s) for this element's type.
ArrayDelimiter() string
}
// BoolArray represents a one-dimensional array of the PostgreSQL boolean type.
type BoolArray []bool
// Scan implements the sql.Scanner interface.
func (a *BoolArray) Scan(src interface{}) error {
switch src := src.(type) {
case []byte:
return a.scanBytes(src)
case string:
return a.scanBytes([]byte(src))
case nil:
*a = nil
return nil
}
return fmt.Errorf("pq: cannot convert %T to BoolArray", src)
}
func (a *BoolArray) scanBytes(src []byte) error {
elems, err := scanLinearArray(src, []byte{','}, "BoolArray")
if err != nil {
return err
}
if *a != nil && len(elems) == 0 {
*a = (*a)[:0]
} else {
b := make(BoolArray, len(elems))
for i, v := range elems {
if len(v) != 1 {
return fmt.Errorf("pq: could not parse boolean array index %d: invalid boolean %q", i, v)
}
switch v[0] {
case 't':
b[i] = true
case 'f':
b[i] = false
default:
return fmt.Errorf("pq: could not parse boolean array index %d: invalid boolean %q", i, v)
}
}
*a = b
}
return nil
}
// Value implements the driver.Valuer interface.
func (a BoolArray) Value() (driver.Value, error) {
if a == nil {
return nil, nil
}
if n := len(a); n > 0 {
// There will be exactly two curly brackets, N bytes of values,
// and N-1 bytes of delimiters.
b := make([]byte, 1+2*n)
for i := 0; i < n; i++ {
b[2*i] = ','
if a[i] {
b[1+2*i] = 't'
} else {
b[1+2*i] = 'f'
}
}
b[0] = '{'
b[2*n] = '}'
return string(b), nil
}
return "{}", nil
}
// ByteaArray represents a one-dimensional array of the PostgreSQL bytea type.
type ByteaArray [][]byte
// Scan implements the sql.Scanner interface.
func (a *ByteaArray) Scan(src interface{}) error {
switch src := src.(type) {
case []byte:
return a.scanBytes(src)
case string:
return a.scanBytes([]byte(src))
case nil:
*a = nil
return nil
}
return fmt.Errorf("pq: cannot convert %T to ByteaArray", src)
}
func (a *ByteaArray) scanBytes(src []byte) error {
elems, err := scanLinearArray(src, []byte{','}, "ByteaArray")
if err != nil {
return err
}
if *a != nil && len(elems) == 0 {
*a = (*a)[:0]
} else {
b := make(ByteaArray, len(elems))
for i, v := range elems {
b[i], err = parseBytea(v)
if err != nil {
return fmt.Errorf("could not parse bytea array index %d: %s", i, err.Error())
}
}
*a = b
}
return nil
}
// Value implements the driver.Valuer interface. It uses the "hex" format which
// is only supported on PostgreSQL 9.0 or newer.
func (a ByteaArray) Value() (driver.Value, error) {
if a == nil {
return nil, nil
}
if n := len(a); n > 0 {
// There will be at least two curly brackets, 2*N bytes of quotes,
// 3*N bytes of hex formatting, and N-1 bytes of delimiters.
size := 1 + 6*n
for _, x := range a {
size += hex.EncodedLen(len(x))
}
b := make([]byte, size)
for i, s := 0, b; i < n; i++ {
o := copy(s, `,"\\x`)
o += hex.Encode(s[o:], a[i])
s[o] = '"'
s = s[o+1:]
}
b[0] = '{'
b[size-1] = '}'
return string(b), nil
}
return "{}", nil
}
// Float64Array represents a one-dimensional array of the PostgreSQL double
// precision type.
type Float64Array []float64
// Scan implements the sql.Scanner interface.
func (a *Float64Array) Scan(src interface{}) error {
switch src := src.(type) {
case []byte:
return a.scanBytes(src)
case string:
return a.scanBytes([]byte(src))
case nil:
*a = nil
return nil
}
return fmt.Errorf("pq: cannot convert %T to Float64Array", src)
}
func (a *Float64Array) scanBytes(src []byte) error {
elems, err := scanLinearArray(src, []byte{','}, "Float64Array")
if err != nil {
return err
}
if *a != nil && len(elems) == 0 {
*a = (*a)[:0]
} else {
b := make(Float64Array, len(elems))
for i, v := range elems {
if b[i], err = strconv.ParseFloat(string(v), 64); err != nil {
return fmt.Errorf("pq: parsing array element index %d: %v", i, err)
}
}
*a = b
}
return nil
}
// Value implements the driver.Valuer interface.
func (a Float64Array) Value() (driver.Value, error) {
if a == nil {
return nil, nil
}
if n := len(a); n > 0 {
// There will be at least two curly brackets, N bytes of values,
// and N-1 bytes of delimiters.
b := make([]byte, 1, 1+2*n)
b[0] = '{'
b = strconv.AppendFloat(b, a[0], 'f', -1, 64)
for i := 1; i < n; i++ {
b = append(b, ',')
b = strconv.AppendFloat(b, a[i], 'f', -1, 64)
}
return string(append(b, '}')), nil
}
return "{}", nil
}
// GenericArray implements the driver.Valuer and sql.Scanner interfaces for
// an array or slice of any dimension.
type GenericArray struct{ A interface{} }
func (GenericArray) evaluateDestination(rt reflect.Type) (reflect.Type, func([]byte, reflect.Value) error, string) {
var assign func([]byte, reflect.Value) error
var del = ","
// TODO calculate the assign function for other types
// TODO repeat this section on the element type of arrays or slices (multidimensional)
{
if reflect.PtrTo(rt).Implements(typeSQLScanner) {
// dest is always addressable because it is an element of a slice.
assign = func(src []byte, dest reflect.Value) (err error) {
ss := dest.Addr().Interface().(sql.Scanner)
if src == nil {
err = ss.Scan(nil)
} else {
err = ss.Scan(src)
}
return
}
goto FoundType
}
assign = func([]byte, reflect.Value) error {
return fmt.Errorf("pq: scanning to %s is not implemented; only sql.Scanner", rt)
}
}
FoundType:
if ad, ok := reflect.Zero(rt).Interface().(ArrayDelimiter); ok {
del = ad.ArrayDelimiter()
}
return rt, assign, del
}
// Scan implements the sql.Scanner interface.
func (a GenericArray) Scan(src interface{}) error {
dpv := reflect.ValueOf(a.A)
switch {
case dpv.Kind() != reflect.Ptr:
return fmt.Errorf("pq: destination %T is not a pointer to array or slice", a.A)
case dpv.IsNil():
return fmt.Errorf("pq: destination %T is nil", a.A)
}
dv := dpv.Elem()
switch dv.Kind() {
case reflect.Slice:
case reflect.Array:
default:
return fmt.Errorf("pq: destination %T is not a pointer to array or slice", a.A)
}
switch src := src.(type) {
case []byte:
return a.scanBytes(src, dv)
case string:
return a.scanBytes([]byte(src), dv)
case nil:
if dv.Kind() == reflect.Slice {
dv.Set(reflect.Zero(dv.Type()))
return nil
}
}
return fmt.Errorf("pq: cannot convert %T to %s", src, dv.Type())
}
func (a GenericArray) scanBytes(src []byte, dv reflect.Value) error {
dtype, assign, del := a.evaluateDestination(dv.Type().Elem())
dims, elems, err := parseArray(src, []byte(del))
if err != nil {
return err
}
// TODO allow multidimensional
if len(dims) > 1 {
return fmt.Errorf("pq: scanning from multidimensional ARRAY%s is not implemented",
strings.Replace(fmt.Sprint(dims), " ", "][", -1))
}
// Treat a zero-dimensional array like an array with a single dimension of zero.
if len(dims) == 0 {
dims = append(dims, 0)
}
for i, rt := 0, dv.Type(); i < len(dims); i, rt = i+1, rt.Elem() {
switch rt.Kind() {
case reflect.Slice:
case reflect.Array:
if rt.Len() != dims[i] {
return fmt.Errorf("pq: cannot convert ARRAY%s to %s",
strings.Replace(fmt.Sprint(dims), " ", "][", -1), dv.Type())
}
default:
// TODO handle multidimensional
}
}
values := reflect.MakeSlice(reflect.SliceOf(dtype), len(elems), len(elems))
for i, e := range elems {
if err := assign(e, values.Index(i)); err != nil {
return fmt.Errorf("pq: parsing array element index %d: %v", i, err)
}
}
// TODO handle multidimensional
switch dv.Kind() {
case reflect.Slice:
dv.Set(values.Slice(0, dims[0]))
case reflect.Array:
for i := 0; i < dims[0]; i++ {
dv.Index(i).Set(values.Index(i))
}
}
return nil
}
// Value implements the driver.Valuer interface.
func (a GenericArray) Value() (driver.Value, error) {
if a.A == nil {
return nil, nil
}
rv := reflect.ValueOf(a.A)
switch rv.Kind() {
case reflect.Slice:
if rv.IsNil() {
return nil, nil
}
case reflect.Array:
default:
return nil, fmt.Errorf("pq: Unable to convert %T to array", a.A)
}
if n := rv.Len(); n > 0 {
// There will be at least two curly brackets, N bytes of values,
// and N-1 bytes of delimiters.
b := make([]byte, 0, 1+2*n)
b, _, err := appendArray(b, rv, n)
return string(b), err
}
return "{}", nil
}
// Int64Array represents a one-dimensional array of the PostgreSQL integer types.
type Int64Array []int64
// Scan implements the sql.Scanner interface.
func (a *Int64Array) Scan(src interface{}) error {
switch src := src.(type) {
case []byte:
return a.scanBytes(src)
case string:
return a.scanBytes([]byte(src))
case nil:
*a = nil
return nil
}
return fmt.Errorf("pq: cannot convert %T to Int64Array", src)
}
func (a *Int64Array) scanBytes(src []byte) error {
elems, err := scanLinearArray(src, []byte{','}, "Int64Array")
if err != nil {
return err
}
if *a != nil && len(elems) == 0 {
*a = (*a)[:0]
} else {
b := make(Int64Array, len(elems))
for i, v := range elems {
if b[i], err = strconv.ParseInt(string(v), 10, 64); err != nil {
return fmt.Errorf("pq: parsing array element index %d: %v", i, err)
}
}
*a = b
}
return nil
}
// Value implements the driver.Valuer interface.
func (a Int64Array) Value() (driver.Value, error) {
if a == nil {
return nil, nil
}
if n := len(a); n > 0 {
// There will be at least two curly brackets, N bytes of values,
// and N-1 bytes of delimiters.
b := make([]byte, 1, 1+2*n)
b[0] = '{'
b = strconv.AppendInt(b, a[0], 10)
for i := 1; i < n; i++ {
b = append(b, ',')
b = strconv.AppendInt(b, a[i], 10)
}
return string(append(b, '}')), nil
}
return "{}", nil
}
// StringArray represents a one-dimensional array of the PostgreSQL character types.
type StringArray []string
// Scan implements the sql.Scanner interface.
func (a *StringArray) Scan(src interface{}) error {
switch src := src.(type) {
case []byte:
return a.scanBytes(src)
case string:
return a.scanBytes([]byte(src))
case nil:
*a = nil
return nil
}
return fmt.Errorf("pq: cannot convert %T to StringArray", src)
}
func (a *StringArray) scanBytes(src []byte) error {
elems, err := scanLinearArray(src, []byte{','}, "StringArray")
if err != nil {
return err
}
if *a != nil && len(elems) == 0 {
*a = (*a)[:0]
} else {
b := make(StringArray, len(elems))
for i, v := range elems {
if b[i] = string(v); v == nil {
return fmt.Errorf("pq: parsing array element index %d: cannot convert nil to string", i)
}
}
*a = b
}
return nil
}
// Value implements the driver.Valuer interface.
func (a StringArray) Value() (driver.Value, error) {
if a == nil {
return nil, nil
}
if n := len(a); n > 0 {
// There will be at least two curly brackets, 2*N bytes of quotes,
// and N-1 bytes of delimiters.
b := make([]byte, 1, 1+3*n)
b[0] = '{'
b = appendArrayQuotedBytes(b, []byte(a[0]))
for i := 1; i < n; i++ {
b = append(b, ',')
b = appendArrayQuotedBytes(b, []byte(a[i]))
}
return string(append(b, '}')), nil
}
return "{}", nil
}
// appendArray appends rv to the buffer, returning the extended buffer and
// the delimiter used between elements.
//
// It panics when n <= 0 or rv's Kind is not reflect.Array nor reflect.Slice.
func appendArray(b []byte, rv reflect.Value, n int) ([]byte, string, error) {
var del string
var err error
b = append(b, '{')
if b, del, err = appendArrayElement(b, rv.Index(0)); err != nil {
return b, del, err
}
for i := 1; i < n; i++ {
b = append(b, del...)
if b, del, err = appendArrayElement(b, rv.Index(i)); err != nil {
return b, del, err
}
}
return append(b, '}'), del, nil
}
// appendArrayElement appends rv to the buffer, returning the extended buffer
// and the delimiter to use before the next element.
//
// When rv's Kind is neither reflect.Array nor reflect.Slice, it is converted
// using driver.DefaultParameterConverter and the resulting []byte or string
// is double-quoted.
//
// See http://www.postgresql.org/docs/current/static/arrays.html#ARRAYS-IO
func appendArrayElement(b []byte, rv reflect.Value) ([]byte, string, error) {
if k := rv.Kind(); k == reflect.Array || k == reflect.Slice {
if t := rv.Type(); t != typeByteSlice && !t.Implements(typeDriverValuer) {
if n := rv.Len(); n > 0 {
return appendArray(b, rv, n)
}
return b, "", nil
}
}
var del = ","
var err error
var iv interface{} = rv.Interface()
if ad, ok := iv.(ArrayDelimiter); ok {
del = ad.ArrayDelimiter()
}
if iv, err = driver.DefaultParameterConverter.ConvertValue(iv); err != nil {
return b, del, err
}
switch v := iv.(type) {
case nil:
return append(b, "NULL"...), del, nil
case []byte:
return appendArrayQuotedBytes(b, v), del, nil
case string:
return appendArrayQuotedBytes(b, []byte(v)), del, nil
}
b, err = appendValue(b, iv)
return b, del, err
}
func appendArrayQuotedBytes(b, v []byte) []byte {
b = append(b, '"')
for {
i := bytes.IndexAny(v, `"\`)
if i < 0 {
b = append(b, v...)
break
}
if i > 0 {
b = append(b, v[:i]...)
}
b = append(b, '\\', v[i])
v = v[i+1:]
}
return append(b, '"')
}
func appendValue(b []byte, v driver.Value) ([]byte, error) {
return append(b, encode(nil, v, 0)...), nil
}
// parseArray extracts the dimensions and elements of an array represented in
// text format. Only representations emitted by the backend are supported.
// Notably, whitespace around brackets and delimiters is significant, and NULL
// is case-sensitive.
//
// See http://www.postgresql.org/docs/current/static/arrays.html#ARRAYS-IO
func parseArray(src, del []byte) (dims []int, elems [][]byte, err error) {
var depth, i int
if len(src) < 1 || src[0] != '{' {
return nil, nil, fmt.Errorf("pq: unable to parse array; expected %q at offset %d", '{', 0)
}
Open:
for i < len(src) {
switch src[i] {
case '{':
depth++
i++
case '}':
elems = make([][]byte, 0)
goto Close
default:
break Open
}
}
dims = make([]int, i)
Element:
for i < len(src) {
switch src[i] {
case '{':
if depth == len(dims) {
break Element
}
depth++
dims[depth-1] = 0
i++
case '"':
var elem = []byte{}
var escape bool
for i++; i < len(src); i++ {
if escape {
elem = append(elem, src[i])
escape = false
} else {
switch src[i] {
default:
elem = append(elem, src[i])
case '\\':
escape = true
case '"':
elems = append(elems, elem)
i++
break Element
}
}
}
default:
for start := i; i < len(src); i++ {
if bytes.HasPrefix(src[i:], del) || src[i] == '}' {
elem := src[start:i]
if len(elem) == 0 {
return nil, nil, fmt.Errorf("pq: unable to parse array; unexpected %q at offset %d", src[i], i)
}
if bytes.Equal(elem, []byte("NULL")) {
elem = nil
}
elems = append(elems, elem)
break Element
}
}
}
}
for i < len(src) {
if bytes.HasPrefix(src[i:], del) && depth > 0 {
dims[depth-1]++
i += len(del)
goto Element
} else if src[i] == '}' && depth > 0 {
dims[depth-1]++
depth--
i++
} else {
return nil, nil, fmt.Errorf("pq: unable to parse array; unexpected %q at offset %d", src[i], i)
}
}
Close:
for i < len(src) {
if src[i] == '}' && depth > 0 {
depth--
i++
} else {
return nil, nil, fmt.Errorf("pq: unable to parse array; unexpected %q at offset %d", src[i], i)
}
}
if depth > 0 {
err = fmt.Errorf("pq: unable to parse array; expected %q at offset %d", '}', i)
}
if err == nil {
for _, d := range dims {
if (len(elems) % d) != 0 {
err = fmt.Errorf("pq: multidimensional arrays must have elements with matching dimensions")
}
}
}
return
}
func scanLinearArray(src, del []byte, typ string) (elems [][]byte, err error) {
dims, elems, err := parseArray(src, del)
if err != nil {
return nil, err
}
if len(dims) > 1 {
return nil, fmt.Errorf("pq: cannot convert ARRAY%s to %s", strings.Replace(fmt.Sprint(dims), " ", "][", -1), typ)
}
return elems, err
}

91
vendor/github.com/lib/pq/buf.go generated vendored Normal file
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package pq
import (
"bytes"
"encoding/binary"
"github.com/lib/pq/oid"
)
type readBuf []byte
func (b *readBuf) int32() (n int) {
n = int(int32(binary.BigEndian.Uint32(*b)))
*b = (*b)[4:]
return
}
func (b *readBuf) oid() (n oid.Oid) {
n = oid.Oid(binary.BigEndian.Uint32(*b))
*b = (*b)[4:]
return
}
// N.B: this is actually an unsigned 16-bit integer, unlike int32
func (b *readBuf) int16() (n int) {
n = int(binary.BigEndian.Uint16(*b))
*b = (*b)[2:]
return
}
func (b *readBuf) string() string {
i := bytes.IndexByte(*b, 0)
if i < 0 {
errorf("invalid message format; expected string terminator")
}
s := (*b)[:i]
*b = (*b)[i+1:]
return string(s)
}
func (b *readBuf) next(n int) (v []byte) {
v = (*b)[:n]
*b = (*b)[n:]
return
}
func (b *readBuf) byte() byte {
return b.next(1)[0]
}
type writeBuf struct {
buf []byte
pos int
}
func (b *writeBuf) int32(n int) {
x := make([]byte, 4)
binary.BigEndian.PutUint32(x, uint32(n))
b.buf = append(b.buf, x...)
}
func (b *writeBuf) int16(n int) {
x := make([]byte, 2)
binary.BigEndian.PutUint16(x, uint16(n))
b.buf = append(b.buf, x...)
}
func (b *writeBuf) string(s string) {
b.buf = append(b.buf, (s + "\000")...)
}
func (b *writeBuf) byte(c byte) {
b.buf = append(b.buf, c)
}
func (b *writeBuf) bytes(v []byte) {
b.buf = append(b.buf, v...)
}
func (b *writeBuf) wrap() []byte {
p := b.buf[b.pos:]
binary.BigEndian.PutUint32(p, uint32(len(p)))
return b.buf
}
func (b *writeBuf) next(c byte) {
p := b.buf[b.pos:]
binary.BigEndian.PutUint32(p, uint32(len(p)))
b.pos = len(b.buf) + 1
b.buf = append(b.buf, c, 0, 0, 0, 0)
}

1854
vendor/github.com/lib/pq/conn.go generated vendored Normal file

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131
vendor/github.com/lib/pq/conn_go18.go generated vendored Normal file
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// +build go1.8
package pq
import (
"context"
"database/sql"
"database/sql/driver"
"fmt"
"io"
"io/ioutil"
)
// Implement the "QueryerContext" interface
func (cn *conn) QueryContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Rows, error) {
list := make([]driver.Value, len(args))
for i, nv := range args {
list[i] = nv.Value
}
finish := cn.watchCancel(ctx)
r, err := cn.query(query, list)
if err != nil {
if finish != nil {
finish()
}
return nil, err
}
r.finish = finish
return r, nil
}
// Implement the "ExecerContext" interface
func (cn *conn) ExecContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Result, error) {
list := make([]driver.Value, len(args))
for i, nv := range args {
list[i] = nv.Value
}
if finish := cn.watchCancel(ctx); finish != nil {
defer finish()
}
return cn.Exec(query, list)
}
// Implement the "ConnBeginTx" interface
func (cn *conn) BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, error) {
var mode string
switch sql.IsolationLevel(opts.Isolation) {
case sql.LevelDefault:
// Don't touch mode: use the server's default
case sql.LevelReadUncommitted:
mode = " ISOLATION LEVEL READ UNCOMMITTED"
case sql.LevelReadCommitted:
mode = " ISOLATION LEVEL READ COMMITTED"
case sql.LevelRepeatableRead:
mode = " ISOLATION LEVEL REPEATABLE READ"
case sql.LevelSerializable:
mode = " ISOLATION LEVEL SERIALIZABLE"
default:
return nil, fmt.Errorf("pq: isolation level not supported: %d", opts.Isolation)
}
if opts.ReadOnly {
mode += " READ ONLY"
} else {
mode += " READ WRITE"
}
tx, err := cn.begin(mode)
if err != nil {
return nil, err
}
cn.txnFinish = cn.watchCancel(ctx)
return tx, nil
}
func (cn *conn) watchCancel(ctx context.Context) func() {
if done := ctx.Done(); done != nil {
finished := make(chan struct{})
go func() {
select {
case <-done:
_ = cn.cancel()
finished <- struct{}{}
case <-finished:
}
}()
return func() {
select {
case <-finished:
case finished <- struct{}{}:
}
}
}
return nil
}
func (cn *conn) cancel() error {
c, err := dial(cn.dialer, cn.opts)
if err != nil {
return err
}
defer c.Close()
{
can := conn{
c: c,
}
err = can.ssl(cn.opts)
if err != nil {
return err
}
w := can.writeBuf(0)
w.int32(80877102) // cancel request code
w.int32(cn.processID)
w.int32(cn.secretKey)
if err := can.sendStartupPacket(w); err != nil {
return err
}
}
// Read until EOF to ensure that the server received the cancel.
{
_, err := io.Copy(ioutil.Discard, c)
return err
}
}

43
vendor/github.com/lib/pq/connector.go generated vendored Normal file
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// +build go1.10
package pq
import (
"context"
"database/sql/driver"
)
// Connector represents a fixed configuration for the pq driver with a given
// name. Connector satisfies the database/sql/driver Connector interface and
// can be used to create any number of DB Conn's via the database/sql OpenDB
// function.
//
// See https://golang.org/pkg/database/sql/driver/#Connector.
// See https://golang.org/pkg/database/sql/#OpenDB.
type connector struct {
name string
}
// Connect returns a connection to the database using the fixed configuration
// of this Connector. Context is not used.
func (c *connector) Connect(_ context.Context) (driver.Conn, error) {
return (&Driver{}).Open(c.name)
}
// Driver returnst the underlying driver of this Connector.
func (c *connector) Driver() driver.Driver {
return &Driver{}
}
var _ driver.Connector = &connector{}
// NewConnector returns a connector for the pq driver in a fixed configuration
// with the given name. The returned connector can be used to create any number
// of equivalent Conn's. The returned connector is intended to be used with
// database/sql.OpenDB.
//
// See https://golang.org/pkg/database/sql/driver/#Connector.
// See https://golang.org/pkg/database/sql/#OpenDB.
func NewConnector(name string) (driver.Connector, error) {
return &connector{name: name}, nil
}

282
vendor/github.com/lib/pq/copy.go generated vendored Normal file
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package pq
import (
"database/sql/driver"
"encoding/binary"
"errors"
"fmt"
"sync"
)
var (
errCopyInClosed = errors.New("pq: copyin statement has already been closed")
errBinaryCopyNotSupported = errors.New("pq: only text format supported for COPY")
errCopyToNotSupported = errors.New("pq: COPY TO is not supported")
errCopyNotSupportedOutsideTxn = errors.New("pq: COPY is only allowed inside a transaction")
errCopyInProgress = errors.New("pq: COPY in progress")
)
// CopyIn creates a COPY FROM statement which can be prepared with
// Tx.Prepare(). The target table should be visible in search_path.
func CopyIn(table string, columns ...string) string {
stmt := "COPY " + QuoteIdentifier(table) + " ("
for i, col := range columns {
if i != 0 {
stmt += ", "
}
stmt += QuoteIdentifier(col)
}
stmt += ") FROM STDIN"
return stmt
}
// CopyInSchema creates a COPY FROM statement which can be prepared with
// Tx.Prepare().
func CopyInSchema(schema, table string, columns ...string) string {
stmt := "COPY " + QuoteIdentifier(schema) + "." + QuoteIdentifier(table) + " ("
for i, col := range columns {
if i != 0 {
stmt += ", "
}
stmt += QuoteIdentifier(col)
}
stmt += ") FROM STDIN"
return stmt
}
type copyin struct {
cn *conn
buffer []byte
rowData chan []byte
done chan bool
closed bool
sync.Mutex // guards err
err error
}
const ciBufferSize = 64 * 1024
// flush buffer before the buffer is filled up and needs reallocation
const ciBufferFlushSize = 63 * 1024
func (cn *conn) prepareCopyIn(q string) (_ driver.Stmt, err error) {
if !cn.isInTransaction() {
return nil, errCopyNotSupportedOutsideTxn
}
ci := &copyin{
cn: cn,
buffer: make([]byte, 0, ciBufferSize),
rowData: make(chan []byte),
done: make(chan bool, 1),
}
// add CopyData identifier + 4 bytes for message length
ci.buffer = append(ci.buffer, 'd', 0, 0, 0, 0)
b := cn.writeBuf('Q')
b.string(q)
cn.send(b)
awaitCopyInResponse:
for {
t, r := cn.recv1()
switch t {
case 'G':
if r.byte() != 0 {
err = errBinaryCopyNotSupported
break awaitCopyInResponse
}
go ci.resploop()
return ci, nil
case 'H':
err = errCopyToNotSupported
break awaitCopyInResponse
case 'E':
err = parseError(r)
case 'Z':
if err == nil {
ci.setBad()
errorf("unexpected ReadyForQuery in response to COPY")
}
cn.processReadyForQuery(r)
return nil, err
default:
ci.setBad()
errorf("unknown response for copy query: %q", t)
}
}
// something went wrong, abort COPY before we return
b = cn.writeBuf('f')
b.string(err.Error())
cn.send(b)
for {
t, r := cn.recv1()
switch t {
case 'c', 'C', 'E':
case 'Z':
// correctly aborted, we're done
cn.processReadyForQuery(r)
return nil, err
default:
ci.setBad()
errorf("unknown response for CopyFail: %q", t)
}
}
}
func (ci *copyin) flush(buf []byte) {
// set message length (without message identifier)
binary.BigEndian.PutUint32(buf[1:], uint32(len(buf)-1))
_, err := ci.cn.c.Write(buf)
if err != nil {
panic(err)
}
}
func (ci *copyin) resploop() {
for {
var r readBuf
t, err := ci.cn.recvMessage(&r)
if err != nil {
ci.setBad()
ci.setError(err)
ci.done <- true
return
}
switch t {
case 'C':
// complete
case 'N':
// NoticeResponse
case 'Z':
ci.cn.processReadyForQuery(&r)
ci.done <- true
return
case 'E':
err := parseError(&r)
ci.setError(err)
default:
ci.setBad()
ci.setError(fmt.Errorf("unknown response during CopyIn: %q", t))
ci.done <- true
return
}
}
}
func (ci *copyin) setBad() {
ci.Lock()
ci.cn.bad = true
ci.Unlock()
}
func (ci *copyin) isBad() bool {
ci.Lock()
b := ci.cn.bad
ci.Unlock()
return b
}
func (ci *copyin) isErrorSet() bool {
ci.Lock()
isSet := (ci.err != nil)
ci.Unlock()
return isSet
}
// setError() sets ci.err if one has not been set already. Caller must not be
// holding ci.Mutex.
func (ci *copyin) setError(err error) {
ci.Lock()
if ci.err == nil {
ci.err = err
}
ci.Unlock()
}
func (ci *copyin) NumInput() int {
return -1
}
func (ci *copyin) Query(v []driver.Value) (r driver.Rows, err error) {
return nil, ErrNotSupported
}
// Exec inserts values into the COPY stream. The insert is asynchronous
// and Exec can return errors from previous Exec calls to the same
// COPY stmt.
//
// You need to call Exec(nil) to sync the COPY stream and to get any
// errors from pending data, since Stmt.Close() doesn't return errors
// to the user.
func (ci *copyin) Exec(v []driver.Value) (r driver.Result, err error) {
if ci.closed {
return nil, errCopyInClosed
}
if ci.isBad() {
return nil, driver.ErrBadConn
}
defer ci.cn.errRecover(&err)
if ci.isErrorSet() {
return nil, ci.err
}
if len(v) == 0 {
return nil, ci.Close()
}
numValues := len(v)
for i, value := range v {
ci.buffer = appendEncodedText(&ci.cn.parameterStatus, ci.buffer, value)
if i < numValues-1 {
ci.buffer = append(ci.buffer, '\t')
}
}
ci.buffer = append(ci.buffer, '\n')
if len(ci.buffer) > ciBufferFlushSize {
ci.flush(ci.buffer)
// reset buffer, keep bytes for message identifier and length
ci.buffer = ci.buffer[:5]
}
return driver.RowsAffected(0), nil
}
func (ci *copyin) Close() (err error) {
if ci.closed { // Don't do anything, we're already closed
return nil
}
ci.closed = true
if ci.isBad() {
return driver.ErrBadConn
}
defer ci.cn.errRecover(&err)
if len(ci.buffer) > 0 {
ci.flush(ci.buffer)
}
// Avoid touching the scratch buffer as resploop could be using it.
err = ci.cn.sendSimpleMessage('c')
if err != nil {
return err
}
<-ci.done
ci.cn.inCopy = false
if ci.isErrorSet() {
err = ci.err
return err
}
return nil
}

245
vendor/github.com/lib/pq/doc.go generated vendored Normal file
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/*
Package pq is a pure Go Postgres driver for the database/sql package.
In most cases clients will use the database/sql package instead of
using this package directly. For example:
import (
"database/sql"
_ "github.com/lib/pq"
)
func main() {
connStr := "user=pqgotest dbname=pqgotest sslmode=verify-full"
db, err := sql.Open("postgres", connStr)
if err != nil {
log.Fatal(err)
}
age := 21
rows, err := db.Query("SELECT name FROM users WHERE age = $1", age)
}
You can also connect to a database using a URL. For example:
connStr := "postgres://pqgotest:password@localhost/pqgotest?sslmode=verify-full"
db, err := sql.Open("postgres", connStr)
Connection String Parameters
Similarly to libpq, when establishing a connection using pq you are expected to
supply a connection string containing zero or more parameters.
A subset of the connection parameters supported by libpq are also supported by pq.
Additionally, pq also lets you specify run-time parameters (such as search_path or work_mem)
directly in the connection string. This is different from libpq, which does not allow
run-time parameters in the connection string, instead requiring you to supply
them in the options parameter.
For compatibility with libpq, the following special connection parameters are
supported:
* dbname - The name of the database to connect to
* user - The user to sign in as
* password - The user's password
* host - The host to connect to. Values that start with / are for unix
domain sockets. (default is localhost)
* port - The port to bind to. (default is 5432)
* sslmode - Whether or not to use SSL (default is require, this is not
the default for libpq)
* fallback_application_name - An application_name to fall back to if one isn't provided.
* connect_timeout - Maximum wait for connection, in seconds. Zero or
not specified means wait indefinitely.
* sslcert - Cert file location. The file must contain PEM encoded data.
* sslkey - Key file location. The file must contain PEM encoded data.
* sslrootcert - The location of the root certificate file. The file
must contain PEM encoded data.
Valid values for sslmode are:
* disable - No SSL
* require - Always SSL (skip verification)
* verify-ca - Always SSL (verify that the certificate presented by the
server was signed by a trusted CA)
* verify-full - Always SSL (verify that the certification presented by
the server was signed by a trusted CA and the server host name
matches the one in the certificate)
See http://www.postgresql.org/docs/current/static/libpq-connect.html#LIBPQ-CONNSTRING
for more information about connection string parameters.
Use single quotes for values that contain whitespace:
"user=pqgotest password='with spaces'"
A backslash will escape the next character in values:
"user=space\ man password='it\'s valid'"
Note that the connection parameter client_encoding (which sets the
text encoding for the connection) may be set but must be "UTF8",
matching with the same rules as Postgres. It is an error to provide
any other value.
In addition to the parameters listed above, any run-time parameter that can be
set at backend start time can be set in the connection string. For more
information, see
http://www.postgresql.org/docs/current/static/runtime-config.html.
Most environment variables as specified at http://www.postgresql.org/docs/current/static/libpq-envars.html
supported by libpq are also supported by pq. If any of the environment
variables not supported by pq are set, pq will panic during connection
establishment. Environment variables have a lower precedence than explicitly
provided connection parameters.
The pgpass mechanism as described in http://www.postgresql.org/docs/current/static/libpq-pgpass.html
is supported, but on Windows PGPASSFILE must be specified explicitly.
Queries
database/sql does not dictate any specific format for parameter
markers in query strings, and pq uses the Postgres-native ordinal markers,
as shown above. The same marker can be reused for the same parameter:
rows, err := db.Query(`SELECT name FROM users WHERE favorite_fruit = $1
OR age BETWEEN $2 AND $2 + 3`, "orange", 64)
pq does not support the LastInsertId() method of the Result type in database/sql.
To return the identifier of an INSERT (or UPDATE or DELETE), use the Postgres
RETURNING clause with a standard Query or QueryRow call:
var userid int
err := db.QueryRow(`INSERT INTO users(name, favorite_fruit, age)
VALUES('beatrice', 'starfruit', 93) RETURNING id`).Scan(&userid)
For more details on RETURNING, see the Postgres documentation:
http://www.postgresql.org/docs/current/static/sql-insert.html
http://www.postgresql.org/docs/current/static/sql-update.html
http://www.postgresql.org/docs/current/static/sql-delete.html
For additional instructions on querying see the documentation for the database/sql package.
Data Types
Parameters pass through driver.DefaultParameterConverter before they are handled
by this package. When the binary_parameters connection option is enabled,
[]byte values are sent directly to the backend as data in binary format.
This package returns the following types for values from the PostgreSQL backend:
- integer types smallint, integer, and bigint are returned as int64
- floating-point types real and double precision are returned as float64
- character types char, varchar, and text are returned as string
- temporal types date, time, timetz, timestamp, and timestamptz are
returned as time.Time
- the boolean type is returned as bool
- the bytea type is returned as []byte
All other types are returned directly from the backend as []byte values in text format.
Errors
pq may return errors of type *pq.Error which can be interrogated for error details:
if err, ok := err.(*pq.Error); ok {
fmt.Println("pq error:", err.Code.Name())
}
See the pq.Error type for details.
Bulk imports
You can perform bulk imports by preparing a statement returned by pq.CopyIn (or
pq.CopyInSchema) in an explicit transaction (sql.Tx). The returned statement
handle can then be repeatedly "executed" to copy data into the target table.
After all data has been processed you should call Exec() once with no arguments
to flush all buffered data. Any call to Exec() might return an error which
should be handled appropriately, but because of the internal buffering an error
returned by Exec() might not be related to the data passed in the call that
failed.
CopyIn uses COPY FROM internally. It is not possible to COPY outside of an
explicit transaction in pq.
Usage example:
txn, err := db.Begin()
if err != nil {
log.Fatal(err)
}
stmt, err := txn.Prepare(pq.CopyIn("users", "name", "age"))
if err != nil {
log.Fatal(err)
}
for _, user := range users {
_, err = stmt.Exec(user.Name, int64(user.Age))
if err != nil {
log.Fatal(err)
}
}
_, err = stmt.Exec()
if err != nil {
log.Fatal(err)
}
err = stmt.Close()
if err != nil {
log.Fatal(err)
}
err = txn.Commit()
if err != nil {
log.Fatal(err)
}
Notifications
PostgreSQL supports a simple publish/subscribe model over database
connections. See http://www.postgresql.org/docs/current/static/sql-notify.html
for more information about the general mechanism.
To start listening for notifications, you first have to open a new connection
to the database by calling NewListener. This connection can not be used for
anything other than LISTEN / NOTIFY. Calling Listen will open a "notification
channel"; once a notification channel is open, a notification generated on that
channel will effect a send on the Listener.Notify channel. A notification
channel will remain open until Unlisten is called, though connection loss might
result in some notifications being lost. To solve this problem, Listener sends
a nil pointer over the Notify channel any time the connection is re-established
following a connection loss. The application can get information about the
state of the underlying connection by setting an event callback in the call to
NewListener.
A single Listener can safely be used from concurrent goroutines, which means
that there is often no need to create more than one Listener in your
application. However, a Listener is always connected to a single database, so
you will need to create a new Listener instance for every database you want to
receive notifications in.
The channel name in both Listen and Unlisten is case sensitive, and can contain
any characters legal in an identifier (see
http://www.postgresql.org/docs/current/static/sql-syntax-lexical.html#SQL-SYNTAX-IDENTIFIERS
for more information). Note that the channel name will be truncated to 63
bytes by the PostgreSQL server.
You can find a complete, working example of Listener usage at
http://godoc.org/github.com/lib/pq/example/listen.
*/
package pq

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package pq
import (
"bytes"
"database/sql/driver"
"encoding/binary"
"encoding/hex"
"errors"
"fmt"
"math"
"strconv"
"strings"
"sync"
"time"
"github.com/lib/pq/oid"
)
func binaryEncode(parameterStatus *parameterStatus, x interface{}) []byte {
switch v := x.(type) {
case []byte:
return v
default:
return encode(parameterStatus, x, oid.T_unknown)
}
}
func encode(parameterStatus *parameterStatus, x interface{}, pgtypOid oid.Oid) []byte {
switch v := x.(type) {
case int64:
return strconv.AppendInt(nil, v, 10)
case float64:
return strconv.AppendFloat(nil, v, 'f', -1, 64)
case []byte:
if pgtypOid == oid.T_bytea {
return encodeBytea(parameterStatus.serverVersion, v)
}
return v
case string:
if pgtypOid == oid.T_bytea {
return encodeBytea(parameterStatus.serverVersion, []byte(v))
}
return []byte(v)
case bool:
return strconv.AppendBool(nil, v)
case time.Time:
return formatTs(v)
default:
errorf("encode: unknown type for %T", v)
}
panic("not reached")
}
func decode(parameterStatus *parameterStatus, s []byte, typ oid.Oid, f format) interface{} {
switch f {
case formatBinary:
return binaryDecode(parameterStatus, s, typ)
case formatText:
return textDecode(parameterStatus, s, typ)
default:
panic("not reached")
}
}
func binaryDecode(parameterStatus *parameterStatus, s []byte, typ oid.Oid) interface{} {
switch typ {
case oid.T_bytea:
return s
case oid.T_int8:
return int64(binary.BigEndian.Uint64(s))
case oid.T_int4:
return int64(int32(binary.BigEndian.Uint32(s)))
case oid.T_int2:
return int64(int16(binary.BigEndian.Uint16(s)))
case oid.T_uuid:
b, err := decodeUUIDBinary(s)
if err != nil {
panic(err)
}
return b
default:
errorf("don't know how to decode binary parameter of type %d", uint32(typ))
}
panic("not reached")
}
func textDecode(parameterStatus *parameterStatus, s []byte, typ oid.Oid) interface{} {
switch typ {
case oid.T_char, oid.T_varchar, oid.T_text:
return string(s)
case oid.T_bytea:
b, err := parseBytea(s)
if err != nil {
errorf("%s", err)
}
return b
case oid.T_timestamptz:
return parseTs(parameterStatus.currentLocation, string(s))
case oid.T_timestamp, oid.T_date:
return parseTs(nil, string(s))
case oid.T_time:
return mustParse("15:04:05", typ, s)
case oid.T_timetz:
return mustParse("15:04:05-07", typ, s)
case oid.T_bool:
return s[0] == 't'
case oid.T_int8, oid.T_int4, oid.T_int2:
i, err := strconv.ParseInt(string(s), 10, 64)
if err != nil {
errorf("%s", err)
}
return i
case oid.T_float4, oid.T_float8:
bits := 64
if typ == oid.T_float4 {
bits = 32
}
f, err := strconv.ParseFloat(string(s), bits)
if err != nil {
errorf("%s", err)
}
return f
}
return s
}
// appendEncodedText encodes item in text format as required by COPY
// and appends to buf
func appendEncodedText(parameterStatus *parameterStatus, buf []byte, x interface{}) []byte {
switch v := x.(type) {
case int64:
return strconv.AppendInt(buf, v, 10)
case float64:
return strconv.AppendFloat(buf, v, 'f', -1, 64)
case []byte:
encodedBytea := encodeBytea(parameterStatus.serverVersion, v)
return appendEscapedText(buf, string(encodedBytea))
case string:
return appendEscapedText(buf, v)
case bool:
return strconv.AppendBool(buf, v)
case time.Time:
return append(buf, formatTs(v)...)
case nil:
return append(buf, "\\N"...)
default:
errorf("encode: unknown type for %T", v)
}
panic("not reached")
}
func appendEscapedText(buf []byte, text string) []byte {
escapeNeeded := false
startPos := 0
var c byte
// check if we need to escape
for i := 0; i < len(text); i++ {
c = text[i]
if c == '\\' || c == '\n' || c == '\r' || c == '\t' {
escapeNeeded = true
startPos = i
break
}
}
if !escapeNeeded {
return append(buf, text...)
}
// copy till first char to escape, iterate the rest
result := append(buf, text[:startPos]...)
for i := startPos; i < len(text); i++ {
c = text[i]
switch c {
case '\\':
result = append(result, '\\', '\\')
case '\n':
result = append(result, '\\', 'n')
case '\r':
result = append(result, '\\', 'r')
case '\t':
result = append(result, '\\', 't')
default:
result = append(result, c)
}
}
return result
}
func mustParse(f string, typ oid.Oid, s []byte) time.Time {
str := string(s)
// check for a 30-minute-offset timezone
if (typ == oid.T_timestamptz || typ == oid.T_timetz) &&
str[len(str)-3] == ':' {
f += ":00"
}
t, err := time.Parse(f, str)
if err != nil {
errorf("decode: %s", err)
}
return t
}
var errInvalidTimestamp = errors.New("invalid timestamp")
type timestampParser struct {
err error
}
func (p *timestampParser) expect(str string, char byte, pos int) {
if p.err != nil {
return
}
if pos+1 > len(str) {
p.err = errInvalidTimestamp
return
}
if c := str[pos]; c != char && p.err == nil {
p.err = fmt.Errorf("expected '%v' at position %v; got '%v'", char, pos, c)
}
}
func (p *timestampParser) mustAtoi(str string, begin int, end int) int {
if p.err != nil {
return 0
}
if begin < 0 || end < 0 || begin > end || end > len(str) {
p.err = errInvalidTimestamp
return 0
}
result, err := strconv.Atoi(str[begin:end])
if err != nil {
if p.err == nil {
p.err = fmt.Errorf("expected number; got '%v'", str)
}
return 0
}
return result
}
// The location cache caches the time zones typically used by the client.
type locationCache struct {
cache map[int]*time.Location
lock sync.Mutex
}
// All connections share the same list of timezones. Benchmarking shows that
// about 5% speed could be gained by putting the cache in the connection and
// losing the mutex, at the cost of a small amount of memory and a somewhat
// significant increase in code complexity.
var globalLocationCache = newLocationCache()
func newLocationCache() *locationCache {
return &locationCache{cache: make(map[int]*time.Location)}
}
// Returns the cached timezone for the specified offset, creating and caching
// it if necessary.
func (c *locationCache) getLocation(offset int) *time.Location {
c.lock.Lock()
defer c.lock.Unlock()
location, ok := c.cache[offset]
if !ok {
location = time.FixedZone("", offset)
c.cache[offset] = location
}
return location
}
var infinityTsEnabled = false
var infinityTsNegative time.Time
var infinityTsPositive time.Time
const (
infinityTsEnabledAlready = "pq: infinity timestamp enabled already"
infinityTsNegativeMustBeSmaller = "pq: infinity timestamp: negative value must be smaller (before) than positive"
)
// EnableInfinityTs controls the handling of Postgres' "-infinity" and
// "infinity" "timestamp"s.
//
// If EnableInfinityTs is not called, "-infinity" and "infinity" will return
// []byte("-infinity") and []byte("infinity") respectively, and potentially
// cause error "sql: Scan error on column index 0: unsupported driver -> Scan
// pair: []uint8 -> *time.Time", when scanning into a time.Time value.
//
// Once EnableInfinityTs has been called, all connections created using this
// driver will decode Postgres' "-infinity" and "infinity" for "timestamp",
// "timestamp with time zone" and "date" types to the predefined minimum and
// maximum times, respectively. When encoding time.Time values, any time which
// equals or precedes the predefined minimum time will be encoded to
// "-infinity". Any values at or past the maximum time will similarly be
// encoded to "infinity".
//
// If EnableInfinityTs is called with negative >= positive, it will panic.
// Calling EnableInfinityTs after a connection has been established results in
// undefined behavior. If EnableInfinityTs is called more than once, it will
// panic.
func EnableInfinityTs(negative time.Time, positive time.Time) {
if infinityTsEnabled {
panic(infinityTsEnabledAlready)
}
if !negative.Before(positive) {
panic(infinityTsNegativeMustBeSmaller)
}
infinityTsEnabled = true
infinityTsNegative = negative
infinityTsPositive = positive
}
/*
* Testing might want to toggle infinityTsEnabled
*/
func disableInfinityTs() {
infinityTsEnabled = false
}
// This is a time function specific to the Postgres default DateStyle
// setting ("ISO, MDY"), the only one we currently support. This
// accounts for the discrepancies between the parsing available with
// time.Parse and the Postgres date formatting quirks.
func parseTs(currentLocation *time.Location, str string) interface{} {
switch str {
case "-infinity":
if infinityTsEnabled {
return infinityTsNegative
}
return []byte(str)
case "infinity":
if infinityTsEnabled {
return infinityTsPositive
}
return []byte(str)
}
t, err := ParseTimestamp(currentLocation, str)
if err != nil {
panic(err)
}
return t
}
// ParseTimestamp parses Postgres' text format. It returns a time.Time in
// currentLocation iff that time's offset agrees with the offset sent from the
// Postgres server. Otherwise, ParseTimestamp returns a time.Time with the
// fixed offset offset provided by the Postgres server.
func ParseTimestamp(currentLocation *time.Location, str string) (time.Time, error) {
p := timestampParser{}
monSep := strings.IndexRune(str, '-')
// this is Gregorian year, not ISO Year
// In Gregorian system, the year 1 BC is followed by AD 1
year := p.mustAtoi(str, 0, monSep)
daySep := monSep + 3
month := p.mustAtoi(str, monSep+1, daySep)
p.expect(str, '-', daySep)
timeSep := daySep + 3
day := p.mustAtoi(str, daySep+1, timeSep)
minLen := monSep + len("01-01") + 1
isBC := strings.HasSuffix(str, " BC")
if isBC {
minLen += 3
}
var hour, minute, second int
if len(str) > minLen {
p.expect(str, ' ', timeSep)
minSep := timeSep + 3
p.expect(str, ':', minSep)
hour = p.mustAtoi(str, timeSep+1, minSep)
secSep := minSep + 3
p.expect(str, ':', secSep)
minute = p.mustAtoi(str, minSep+1, secSep)
secEnd := secSep + 3
second = p.mustAtoi(str, secSep+1, secEnd)
}
remainderIdx := monSep + len("01-01 00:00:00") + 1
// Three optional (but ordered) sections follow: the
// fractional seconds, the time zone offset, and the BC
// designation. We set them up here and adjust the other
// offsets if the preceding sections exist.
nanoSec := 0
tzOff := 0
if remainderIdx < len(str) && str[remainderIdx] == '.' {
fracStart := remainderIdx + 1
fracOff := strings.IndexAny(str[fracStart:], "-+ ")
if fracOff < 0 {
fracOff = len(str) - fracStart
}
fracSec := p.mustAtoi(str, fracStart, fracStart+fracOff)
nanoSec = fracSec * (1000000000 / int(math.Pow(10, float64(fracOff))))
remainderIdx += fracOff + 1
}
if tzStart := remainderIdx; tzStart < len(str) && (str[tzStart] == '-' || str[tzStart] == '+') {
// time zone separator is always '-' or '+' (UTC is +00)
var tzSign int
switch c := str[tzStart]; c {
case '-':
tzSign = -1
case '+':
tzSign = +1
default:
return time.Time{}, fmt.Errorf("expected '-' or '+' at position %v; got %v", tzStart, c)
}
tzHours := p.mustAtoi(str, tzStart+1, tzStart+3)
remainderIdx += 3
var tzMin, tzSec int
if remainderIdx < len(str) && str[remainderIdx] == ':' {
tzMin = p.mustAtoi(str, remainderIdx+1, remainderIdx+3)
remainderIdx += 3
}
if remainderIdx < len(str) && str[remainderIdx] == ':' {
tzSec = p.mustAtoi(str, remainderIdx+1, remainderIdx+3)
remainderIdx += 3
}
tzOff = tzSign * ((tzHours * 60 * 60) + (tzMin * 60) + tzSec)
}
var isoYear int
if isBC {
isoYear = 1 - year
remainderIdx += 3
} else {
isoYear = year
}
if remainderIdx < len(str) {
return time.Time{}, fmt.Errorf("expected end of input, got %v", str[remainderIdx:])
}
t := time.Date(isoYear, time.Month(month), day,
hour, minute, second, nanoSec,
globalLocationCache.getLocation(tzOff))
if currentLocation != nil {
// Set the location of the returned Time based on the session's
// TimeZone value, but only if the local time zone database agrees with
// the remote database on the offset.
lt := t.In(currentLocation)
_, newOff := lt.Zone()
if newOff == tzOff {
t = lt
}
}
return t, p.err
}
// formatTs formats t into a format postgres understands.
func formatTs(t time.Time) []byte {
if infinityTsEnabled {
// t <= -infinity : ! (t > -infinity)
if !t.After(infinityTsNegative) {
return []byte("-infinity")
}
// t >= infinity : ! (!t < infinity)
if !t.Before(infinityTsPositive) {
return []byte("infinity")
}
}
return FormatTimestamp(t)
}
// FormatTimestamp formats t into Postgres' text format for timestamps.
func FormatTimestamp(t time.Time) []byte {
// Need to send dates before 0001 A.D. with " BC" suffix, instead of the
// minus sign preferred by Go.
// Beware, "0000" in ISO is "1 BC", "-0001" is "2 BC" and so on
bc := false
if t.Year() <= 0 {
// flip year sign, and add 1, e.g: "0" will be "1", and "-10" will be "11"
t = t.AddDate((-t.Year())*2+1, 0, 0)
bc = true
}
b := []byte(t.Format("2006-01-02 15:04:05.999999999Z07:00"))
_, offset := t.Zone()
offset = offset % 60
if offset != 0 {
// RFC3339Nano already printed the minus sign
if offset < 0 {
offset = -offset
}
b = append(b, ':')
if offset < 10 {
b = append(b, '0')
}
b = strconv.AppendInt(b, int64(offset), 10)
}
if bc {
b = append(b, " BC"...)
}
return b
}
// Parse a bytea value received from the server. Both "hex" and the legacy
// "escape" format are supported.
func parseBytea(s []byte) (result []byte, err error) {
if len(s) >= 2 && bytes.Equal(s[:2], []byte("\\x")) {
// bytea_output = hex
s = s[2:] // trim off leading "\\x"
result = make([]byte, hex.DecodedLen(len(s)))
_, err := hex.Decode(result, s)
if err != nil {
return nil, err
}
} else {
// bytea_output = escape
for len(s) > 0 {
if s[0] == '\\' {
// escaped '\\'
if len(s) >= 2 && s[1] == '\\' {
result = append(result, '\\')
s = s[2:]
continue
}
// '\\' followed by an octal number
if len(s) < 4 {
return nil, fmt.Errorf("invalid bytea sequence %v", s)
}
r, err := strconv.ParseInt(string(s[1:4]), 8, 9)
if err != nil {
return nil, fmt.Errorf("could not parse bytea value: %s", err.Error())
}
result = append(result, byte(r))
s = s[4:]
} else {
// We hit an unescaped, raw byte. Try to read in as many as
// possible in one go.
i := bytes.IndexByte(s, '\\')
if i == -1 {
result = append(result, s...)
break
}
result = append(result, s[:i]...)
s = s[i:]
}
}
}
return result, nil
}
func encodeBytea(serverVersion int, v []byte) (result []byte) {
if serverVersion >= 90000 {
// Use the hex format if we know that the server supports it
result = make([]byte, 2+hex.EncodedLen(len(v)))
result[0] = '\\'
result[1] = 'x'
hex.Encode(result[2:], v)
} else {
// .. or resort to "escape"
for _, b := range v {
if b == '\\' {
result = append(result, '\\', '\\')
} else if b < 0x20 || b > 0x7e {
result = append(result, []byte(fmt.Sprintf("\\%03o", b))...)
} else {
result = append(result, b)
}
}
}
return result
}
// NullTime represents a time.Time that may be null. NullTime implements the
// sql.Scanner interface so it can be used as a scan destination, similar to
// sql.NullString.
type NullTime struct {
Time time.Time
Valid bool // Valid is true if Time is not NULL
}
// Scan implements the Scanner interface.
func (nt *NullTime) Scan(value interface{}) error {
nt.Time, nt.Valid = value.(time.Time)
return nil
}
// Value implements the driver Valuer interface.
func (nt NullTime) Value() (driver.Value, error) {
if !nt.Valid {
return nil, nil
}
return nt.Time, nil
}

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package pq
import (
"database/sql/driver"
"fmt"
"io"
"net"
"runtime"
)
// Error severities
const (
Efatal = "FATAL"
Epanic = "PANIC"
Ewarning = "WARNING"
Enotice = "NOTICE"
Edebug = "DEBUG"
Einfo = "INFO"
Elog = "LOG"
)
// Error represents an error communicating with the server.
//
// See http://www.postgresql.org/docs/current/static/protocol-error-fields.html for details of the fields
type Error struct {
Severity string
Code ErrorCode
Message string
Detail string
Hint string
Position string
InternalPosition string
InternalQuery string
Where string
Schema string
Table string
Column string
DataTypeName string
Constraint string
File string
Line string
Routine string
}
// ErrorCode is a five-character error code.
type ErrorCode string
// Name returns a more human friendly rendering of the error code, namely the
// "condition name".
//
// See http://www.postgresql.org/docs/9.3/static/errcodes-appendix.html for
// details.
func (ec ErrorCode) Name() string {
return errorCodeNames[ec]
}
// ErrorClass is only the class part of an error code.
type ErrorClass string
// Name returns the condition name of an error class. It is equivalent to the
// condition name of the "standard" error code (i.e. the one having the last
// three characters "000").
func (ec ErrorClass) Name() string {
return errorCodeNames[ErrorCode(ec+"000")]
}
// Class returns the error class, e.g. "28".
//
// See http://www.postgresql.org/docs/9.3/static/errcodes-appendix.html for
// details.
func (ec ErrorCode) Class() ErrorClass {
return ErrorClass(ec[0:2])
}
// errorCodeNames is a mapping between the five-character error codes and the
// human readable "condition names". It is derived from the list at
// http://www.postgresql.org/docs/9.3/static/errcodes-appendix.html
var errorCodeNames = map[ErrorCode]string{
// Class 00 - Successful Completion
"00000": "successful_completion",
// Class 01 - Warning
"01000": "warning",
"0100C": "dynamic_result_sets_returned",
"01008": "implicit_zero_bit_padding",
"01003": "null_value_eliminated_in_set_function",
"01007": "privilege_not_granted",
"01006": "privilege_not_revoked",
"01004": "string_data_right_truncation",
"01P01": "deprecated_feature",
// Class 02 - No Data (this is also a warning class per the SQL standard)
"02000": "no_data",
"02001": "no_additional_dynamic_result_sets_returned",
// Class 03 - SQL Statement Not Yet Complete
"03000": "sql_statement_not_yet_complete",
// Class 08 - Connection Exception
"08000": "connection_exception",
"08003": "connection_does_not_exist",
"08006": "connection_failure",
"08001": "sqlclient_unable_to_establish_sqlconnection",
"08004": "sqlserver_rejected_establishment_of_sqlconnection",
"08007": "transaction_resolution_unknown",
"08P01": "protocol_violation",
// Class 09 - Triggered Action Exception
"09000": "triggered_action_exception",
// Class 0A - Feature Not Supported
"0A000": "feature_not_supported",
// Class 0B - Invalid Transaction Initiation
"0B000": "invalid_transaction_initiation",
// Class 0F - Locator Exception
"0F000": "locator_exception",
"0F001": "invalid_locator_specification",
// Class 0L - Invalid Grantor
"0L000": "invalid_grantor",
"0LP01": "invalid_grant_operation",
// Class 0P - Invalid Role Specification
"0P000": "invalid_role_specification",
// Class 0Z - Diagnostics Exception
"0Z000": "diagnostics_exception",
"0Z002": "stacked_diagnostics_accessed_without_active_handler",
// Class 20 - Case Not Found
"20000": "case_not_found",
// Class 21 - Cardinality Violation
"21000": "cardinality_violation",
// Class 22 - Data Exception
"22000": "data_exception",
"2202E": "array_subscript_error",
"22021": "character_not_in_repertoire",
"22008": "datetime_field_overflow",
"22012": "division_by_zero",
"22005": "error_in_assignment",
"2200B": "escape_character_conflict",
"22022": "indicator_overflow",
"22015": "interval_field_overflow",
"2201E": "invalid_argument_for_logarithm",
"22014": "invalid_argument_for_ntile_function",
"22016": "invalid_argument_for_nth_value_function",
"2201F": "invalid_argument_for_power_function",
"2201G": "invalid_argument_for_width_bucket_function",
"22018": "invalid_character_value_for_cast",
"22007": "invalid_datetime_format",
"22019": "invalid_escape_character",
"2200D": "invalid_escape_octet",
"22025": "invalid_escape_sequence",
"22P06": "nonstandard_use_of_escape_character",
"22010": "invalid_indicator_parameter_value",
"22023": "invalid_parameter_value",
"2201B": "invalid_regular_expression",
"2201W": "invalid_row_count_in_limit_clause",
"2201X": "invalid_row_count_in_result_offset_clause",
"22009": "invalid_time_zone_displacement_value",
"2200C": "invalid_use_of_escape_character",
"2200G": "most_specific_type_mismatch",
"22004": "null_value_not_allowed",
"22002": "null_value_no_indicator_parameter",
"22003": "numeric_value_out_of_range",
"2200H": "sequence_generator_limit_exceeded",
"22026": "string_data_length_mismatch",
"22001": "string_data_right_truncation",
"22011": "substring_error",
"22027": "trim_error",
"22024": "unterminated_c_string",
"2200F": "zero_length_character_string",
"22P01": "floating_point_exception",
"22P02": "invalid_text_representation",
"22P03": "invalid_binary_representation",
"22P04": "bad_copy_file_format",
"22P05": "untranslatable_character",
"2200L": "not_an_xml_document",
"2200M": "invalid_xml_document",
"2200N": "invalid_xml_content",
"2200S": "invalid_xml_comment",
"2200T": "invalid_xml_processing_instruction",
// Class 23 - Integrity Constraint Violation
"23000": "integrity_constraint_violation",
"23001": "restrict_violation",
"23502": "not_null_violation",
"23503": "foreign_key_violation",
"23505": "unique_violation",
"23514": "check_violation",
"23P01": "exclusion_violation",
// Class 24 - Invalid Cursor State
"24000": "invalid_cursor_state",
// Class 25 - Invalid Transaction State
"25000": "invalid_transaction_state",
"25001": "active_sql_transaction",
"25002": "branch_transaction_already_active",
"25008": "held_cursor_requires_same_isolation_level",
"25003": "inappropriate_access_mode_for_branch_transaction",
"25004": "inappropriate_isolation_level_for_branch_transaction",
"25005": "no_active_sql_transaction_for_branch_transaction",
"25006": "read_only_sql_transaction",
"25007": "schema_and_data_statement_mixing_not_supported",
"25P01": "no_active_sql_transaction",
"25P02": "in_failed_sql_transaction",
// Class 26 - Invalid SQL Statement Name
"26000": "invalid_sql_statement_name",
// Class 27 - Triggered Data Change Violation
"27000": "triggered_data_change_violation",
// Class 28 - Invalid Authorization Specification
"28000": "invalid_authorization_specification",
"28P01": "invalid_password",
// Class 2B - Dependent Privilege Descriptors Still Exist
"2B000": "dependent_privilege_descriptors_still_exist",
"2BP01": "dependent_objects_still_exist",
// Class 2D - Invalid Transaction Termination
"2D000": "invalid_transaction_termination",
// Class 2F - SQL Routine Exception
"2F000": "sql_routine_exception",
"2F005": "function_executed_no_return_statement",
"2F002": "modifying_sql_data_not_permitted",
"2F003": "prohibited_sql_statement_attempted",
"2F004": "reading_sql_data_not_permitted",
// Class 34 - Invalid Cursor Name
"34000": "invalid_cursor_name",
// Class 38 - External Routine Exception
"38000": "external_routine_exception",
"38001": "containing_sql_not_permitted",
"38002": "modifying_sql_data_not_permitted",
"38003": "prohibited_sql_statement_attempted",
"38004": "reading_sql_data_not_permitted",
// Class 39 - External Routine Invocation Exception
"39000": "external_routine_invocation_exception",
"39001": "invalid_sqlstate_returned",
"39004": "null_value_not_allowed",
"39P01": "trigger_protocol_violated",
"39P02": "srf_protocol_violated",
// Class 3B - Savepoint Exception
"3B000": "savepoint_exception",
"3B001": "invalid_savepoint_specification",
// Class 3D - Invalid Catalog Name
"3D000": "invalid_catalog_name",
// Class 3F - Invalid Schema Name
"3F000": "invalid_schema_name",
// Class 40 - Transaction Rollback
"40000": "transaction_rollback",
"40002": "transaction_integrity_constraint_violation",
"40001": "serialization_failure",
"40003": "statement_completion_unknown",
"40P01": "deadlock_detected",
// Class 42 - Syntax Error or Access Rule Violation
"42000": "syntax_error_or_access_rule_violation",
"42601": "syntax_error",
"42501": "insufficient_privilege",
"42846": "cannot_coerce",
"42803": "grouping_error",
"42P20": "windowing_error",
"42P19": "invalid_recursion",
"42830": "invalid_foreign_key",
"42602": "invalid_name",
"42622": "name_too_long",
"42939": "reserved_name",
"42804": "datatype_mismatch",
"42P18": "indeterminate_datatype",
"42P21": "collation_mismatch",
"42P22": "indeterminate_collation",
"42809": "wrong_object_type",
"42703": "undefined_column",
"42883": "undefined_function",
"42P01": "undefined_table",
"42P02": "undefined_parameter",
"42704": "undefined_object",
"42701": "duplicate_column",
"42P03": "duplicate_cursor",
"42P04": "duplicate_database",
"42723": "duplicate_function",
"42P05": "duplicate_prepared_statement",
"42P06": "duplicate_schema",
"42P07": "duplicate_table",
"42712": "duplicate_alias",
"42710": "duplicate_object",
"42702": "ambiguous_column",
"42725": "ambiguous_function",
"42P08": "ambiguous_parameter",
"42P09": "ambiguous_alias",
"42P10": "invalid_column_reference",
"42611": "invalid_column_definition",
"42P11": "invalid_cursor_definition",
"42P12": "invalid_database_definition",
"42P13": "invalid_function_definition",
"42P14": "invalid_prepared_statement_definition",
"42P15": "invalid_schema_definition",
"42P16": "invalid_table_definition",
"42P17": "invalid_object_definition",
// Class 44 - WITH CHECK OPTION Violation
"44000": "with_check_option_violation",
// Class 53 - Insufficient Resources
"53000": "insufficient_resources",
"53100": "disk_full",
"53200": "out_of_memory",
"53300": "too_many_connections",
"53400": "configuration_limit_exceeded",
// Class 54 - Program Limit Exceeded
"54000": "program_limit_exceeded",
"54001": "statement_too_complex",
"54011": "too_many_columns",
"54023": "too_many_arguments",
// Class 55 - Object Not In Prerequisite State
"55000": "object_not_in_prerequisite_state",
"55006": "object_in_use",
"55P02": "cant_change_runtime_param",
"55P03": "lock_not_available",
// Class 57 - Operator Intervention
"57000": "operator_intervention",
"57014": "query_canceled",
"57P01": "admin_shutdown",
"57P02": "crash_shutdown",
"57P03": "cannot_connect_now",
"57P04": "database_dropped",
// Class 58 - System Error (errors external to PostgreSQL itself)
"58000": "system_error",
"58030": "io_error",
"58P01": "undefined_file",
"58P02": "duplicate_file",
// Class F0 - Configuration File Error
"F0000": "config_file_error",
"F0001": "lock_file_exists",
// Class HV - Foreign Data Wrapper Error (SQL/MED)
"HV000": "fdw_error",
"HV005": "fdw_column_name_not_found",
"HV002": "fdw_dynamic_parameter_value_needed",
"HV010": "fdw_function_sequence_error",
"HV021": "fdw_inconsistent_descriptor_information",
"HV024": "fdw_invalid_attribute_value",
"HV007": "fdw_invalid_column_name",
"HV008": "fdw_invalid_column_number",
"HV004": "fdw_invalid_data_type",
"HV006": "fdw_invalid_data_type_descriptors",
"HV091": "fdw_invalid_descriptor_field_identifier",
"HV00B": "fdw_invalid_handle",
"HV00C": "fdw_invalid_option_index",
"HV00D": "fdw_invalid_option_name",
"HV090": "fdw_invalid_string_length_or_buffer_length",
"HV00A": "fdw_invalid_string_format",
"HV009": "fdw_invalid_use_of_null_pointer",
"HV014": "fdw_too_many_handles",
"HV001": "fdw_out_of_memory",
"HV00P": "fdw_no_schemas",
"HV00J": "fdw_option_name_not_found",
"HV00K": "fdw_reply_handle",
"HV00Q": "fdw_schema_not_found",
"HV00R": "fdw_table_not_found",
"HV00L": "fdw_unable_to_create_execution",
"HV00M": "fdw_unable_to_create_reply",
"HV00N": "fdw_unable_to_establish_connection",
// Class P0 - PL/pgSQL Error
"P0000": "plpgsql_error",
"P0001": "raise_exception",
"P0002": "no_data_found",
"P0003": "too_many_rows",
// Class XX - Internal Error
"XX000": "internal_error",
"XX001": "data_corrupted",
"XX002": "index_corrupted",
}
func parseError(r *readBuf) *Error {
err := new(Error)
for t := r.byte(); t != 0; t = r.byte() {
msg := r.string()
switch t {
case 'S':
err.Severity = msg
case 'C':
err.Code = ErrorCode(msg)
case 'M':
err.Message = msg
case 'D':
err.Detail = msg
case 'H':
err.Hint = msg
case 'P':
err.Position = msg
case 'p':
err.InternalPosition = msg
case 'q':
err.InternalQuery = msg
case 'W':
err.Where = msg
case 's':
err.Schema = msg
case 't':
err.Table = msg
case 'c':
err.Column = msg
case 'd':
err.DataTypeName = msg
case 'n':
err.Constraint = msg
case 'F':
err.File = msg
case 'L':
err.Line = msg
case 'R':
err.Routine = msg
}
}
return err
}
// Fatal returns true if the Error Severity is fatal.
func (err *Error) Fatal() bool {
return err.Severity == Efatal
}
// Get implements the legacy PGError interface. New code should use the fields
// of the Error struct directly.
func (err *Error) Get(k byte) (v string) {
switch k {
case 'S':
return err.Severity
case 'C':
return string(err.Code)
case 'M':
return err.Message
case 'D':
return err.Detail
case 'H':
return err.Hint
case 'P':
return err.Position
case 'p':
return err.InternalPosition
case 'q':
return err.InternalQuery
case 'W':
return err.Where
case 's':
return err.Schema
case 't':
return err.Table
case 'c':
return err.Column
case 'd':
return err.DataTypeName
case 'n':
return err.Constraint
case 'F':
return err.File
case 'L':
return err.Line
case 'R':
return err.Routine
}
return ""
}
func (err Error) Error() string {
return "pq: " + err.Message
}
// PGError is an interface used by previous versions of pq. It is provided
// only to support legacy code. New code should use the Error type.
type PGError interface {
Error() string
Fatal() bool
Get(k byte) (v string)
}
func errorf(s string, args ...interface{}) {
panic(fmt.Errorf("pq: %s", fmt.Sprintf(s, args...)))
}
// TODO(ainar-g) Rename to errorf after removing panics.
func fmterrorf(s string, args ...interface{}) error {
return fmt.Errorf("pq: %s", fmt.Sprintf(s, args...))
}
func errRecoverNoErrBadConn(err *error) {
e := recover()
if e == nil {
// Do nothing
return
}
var ok bool
*err, ok = e.(error)
if !ok {
*err = fmt.Errorf("pq: unexpected error: %#v", e)
}
}
func (c *conn) errRecover(err *error) {
e := recover()
switch v := e.(type) {
case nil:
// Do nothing
case runtime.Error:
c.bad = true
panic(v)
case *Error:
if v.Fatal() {
*err = driver.ErrBadConn
} else {
*err = v
}
case *net.OpError:
c.bad = true
*err = v
case error:
if v == io.EOF || v.(error).Error() == "remote error: handshake failure" {
*err = driver.ErrBadConn
} else {
*err = v
}
default:
c.bad = true
panic(fmt.Sprintf("unknown error: %#v", e))
}
// Any time we return ErrBadConn, we need to remember it since *Tx doesn't
// mark the connection bad in database/sql.
if *err == driver.ErrBadConn {
c.bad = true
}
}

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module github.com/lib/pq

797
vendor/github.com/lib/pq/notify.go generated vendored Normal file
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package pq
// Package pq is a pure Go Postgres driver for the database/sql package.
// This module contains support for Postgres LISTEN/NOTIFY.
import (
"errors"
"fmt"
"sync"
"sync/atomic"
"time"
)
// Notification represents a single notification from the database.
type Notification struct {
// Process ID (PID) of the notifying postgres backend.
BePid int
// Name of the channel the notification was sent on.
Channel string
// Payload, or the empty string if unspecified.
Extra string
}
func recvNotification(r *readBuf) *Notification {
bePid := r.int32()
channel := r.string()
extra := r.string()
return &Notification{bePid, channel, extra}
}
const (
connStateIdle int32 = iota
connStateExpectResponse
connStateExpectReadyForQuery
)
type message struct {
typ byte
err error
}
var errListenerConnClosed = errors.New("pq: ListenerConn has been closed")
// ListenerConn is a low-level interface for waiting for notifications. You
// should use Listener instead.
type ListenerConn struct {
// guards cn and err
connectionLock sync.Mutex
cn *conn
err error
connState int32
// the sending goroutine will be holding this lock
senderLock sync.Mutex
notificationChan chan<- *Notification
replyChan chan message
}
// NewListenerConn creates a new ListenerConn. Use NewListener instead.
func NewListenerConn(name string, notificationChan chan<- *Notification) (*ListenerConn, error) {
return newDialListenerConn(defaultDialer{}, name, notificationChan)
}
func newDialListenerConn(d Dialer, name string, c chan<- *Notification) (*ListenerConn, error) {
cn, err := DialOpen(d, name)
if err != nil {
return nil, err
}
l := &ListenerConn{
cn: cn.(*conn),
notificationChan: c,
connState: connStateIdle,
replyChan: make(chan message, 2),
}
go l.listenerConnMain()
return l, nil
}
// We can only allow one goroutine at a time to be running a query on the
// connection for various reasons, so the goroutine sending on the connection
// must be holding senderLock.
//
// Returns an error if an unrecoverable error has occurred and the ListenerConn
// should be abandoned.
func (l *ListenerConn) acquireSenderLock() error {
// we must acquire senderLock first to avoid deadlocks; see ExecSimpleQuery
l.senderLock.Lock()
l.connectionLock.Lock()
err := l.err
l.connectionLock.Unlock()
if err != nil {
l.senderLock.Unlock()
return err
}
return nil
}
func (l *ListenerConn) releaseSenderLock() {
l.senderLock.Unlock()
}
// setState advances the protocol state to newState. Returns false if moving
// to that state from the current state is not allowed.
func (l *ListenerConn) setState(newState int32) bool {
var expectedState int32
switch newState {
case connStateIdle:
expectedState = connStateExpectReadyForQuery
case connStateExpectResponse:
expectedState = connStateIdle
case connStateExpectReadyForQuery:
expectedState = connStateExpectResponse
default:
panic(fmt.Sprintf("unexpected listenerConnState %d", newState))
}
return atomic.CompareAndSwapInt32(&l.connState, expectedState, newState)
}
// Main logic is here: receive messages from the postgres backend, forward
// notifications and query replies and keep the internal state in sync with the
// protocol state. Returns when the connection has been lost, is about to go
// away or should be discarded because we couldn't agree on the state with the
// server backend.
func (l *ListenerConn) listenerConnLoop() (err error) {
defer errRecoverNoErrBadConn(&err)
r := &readBuf{}
for {
t, err := l.cn.recvMessage(r)
if err != nil {
return err
}
switch t {
case 'A':
// recvNotification copies all the data so we don't need to worry
// about the scratch buffer being overwritten.
l.notificationChan <- recvNotification(r)
case 'T', 'D':
// only used by tests; ignore
case 'E':
// We might receive an ErrorResponse even when not in a query; it
// is expected that the server will close the connection after
// that, but we should make sure that the error we display is the
// one from the stray ErrorResponse, not io.ErrUnexpectedEOF.
if !l.setState(connStateExpectReadyForQuery) {
return parseError(r)
}
l.replyChan <- message{t, parseError(r)}
case 'C', 'I':
if !l.setState(connStateExpectReadyForQuery) {
// protocol out of sync
return fmt.Errorf("unexpected CommandComplete")
}
// ExecSimpleQuery doesn't need to know about this message
case 'Z':
if !l.setState(connStateIdle) {
// protocol out of sync
return fmt.Errorf("unexpected ReadyForQuery")
}
l.replyChan <- message{t, nil}
case 'N', 'S':
// ignore
default:
return fmt.Errorf("unexpected message %q from server in listenerConnLoop", t)
}
}
}
// This is the main routine for the goroutine receiving on the database
// connection. Most of the main logic is in listenerConnLoop.
func (l *ListenerConn) listenerConnMain() {
err := l.listenerConnLoop()
// listenerConnLoop terminated; we're done, but we still have to clean up.
// Make sure nobody tries to start any new queries by making sure the err
// pointer is set. It is important that we do not overwrite its value; a
// connection could be closed by either this goroutine or one sending on
// the connection -- whoever closes the connection is assumed to have the
// more meaningful error message (as the other one will probably get
// net.errClosed), so that goroutine sets the error we expose while the
// other error is discarded. If the connection is lost while two
// goroutines are operating on the socket, it probably doesn't matter which
// error we expose so we don't try to do anything more complex.
l.connectionLock.Lock()
if l.err == nil {
l.err = err
}
l.cn.Close()
l.connectionLock.Unlock()
// There might be a query in-flight; make sure nobody's waiting for a
// response to it, since there's not going to be one.
close(l.replyChan)
// let the listener know we're done
close(l.notificationChan)
// this ListenerConn is done
}
// Listen sends a LISTEN query to the server. See ExecSimpleQuery.
func (l *ListenerConn) Listen(channel string) (bool, error) {
return l.ExecSimpleQuery("LISTEN " + QuoteIdentifier(channel))
}
// Unlisten sends an UNLISTEN query to the server. See ExecSimpleQuery.
func (l *ListenerConn) Unlisten(channel string) (bool, error) {
return l.ExecSimpleQuery("UNLISTEN " + QuoteIdentifier(channel))
}
// UnlistenAll sends an `UNLISTEN *` query to the server. See ExecSimpleQuery.
func (l *ListenerConn) UnlistenAll() (bool, error) {
return l.ExecSimpleQuery("UNLISTEN *")
}
// Ping the remote server to make sure it's alive. Non-nil error means the
// connection has failed and should be abandoned.
func (l *ListenerConn) Ping() error {
sent, err := l.ExecSimpleQuery("")
if !sent {
return err
}
if err != nil {
// shouldn't happen
panic(err)
}
return nil
}
// Attempt to send a query on the connection. Returns an error if sending the
// query failed, and the caller should initiate closure of this connection.
// The caller must be holding senderLock (see acquireSenderLock and
// releaseSenderLock).
func (l *ListenerConn) sendSimpleQuery(q string) (err error) {
defer errRecoverNoErrBadConn(&err)
// must set connection state before sending the query
if !l.setState(connStateExpectResponse) {
panic("two queries running at the same time")
}
// Can't use l.cn.writeBuf here because it uses the scratch buffer which
// might get overwritten by listenerConnLoop.
b := &writeBuf{
buf: []byte("Q\x00\x00\x00\x00"),
pos: 1,
}
b.string(q)
l.cn.send(b)
return nil
}
// ExecSimpleQuery executes a "simple query" (i.e. one with no bindable
// parameters) on the connection. The possible return values are:
// 1) "executed" is true; the query was executed to completion on the
// database server. If the query failed, err will be set to the error
// returned by the database, otherwise err will be nil.
// 2) If "executed" is false, the query could not be executed on the remote
// server. err will be non-nil.
//
// After a call to ExecSimpleQuery has returned an executed=false value, the
// connection has either been closed or will be closed shortly thereafter, and
// all subsequently executed queries will return an error.
func (l *ListenerConn) ExecSimpleQuery(q string) (executed bool, err error) {
if err = l.acquireSenderLock(); err != nil {
return false, err
}
defer l.releaseSenderLock()
err = l.sendSimpleQuery(q)
if err != nil {
// We can't know what state the protocol is in, so we need to abandon
// this connection.
l.connectionLock.Lock()
// Set the error pointer if it hasn't been set already; see
// listenerConnMain.
if l.err == nil {
l.err = err
}
l.connectionLock.Unlock()
l.cn.c.Close()
return false, err
}
// now we just wait for a reply..
for {
m, ok := <-l.replyChan
if !ok {
// We lost the connection to server, don't bother waiting for a
// a response. err should have been set already.
l.connectionLock.Lock()
err := l.err
l.connectionLock.Unlock()
return false, err
}
switch m.typ {
case 'Z':
// sanity check
if m.err != nil {
panic("m.err != nil")
}
// done; err might or might not be set
return true, err
case 'E':
// sanity check
if m.err == nil {
panic("m.err == nil")
}
// server responded with an error; ReadyForQuery to follow
err = m.err
default:
return false, fmt.Errorf("unknown response for simple query: %q", m.typ)
}
}
}
// Close closes the connection.
func (l *ListenerConn) Close() error {
l.connectionLock.Lock()
if l.err != nil {
l.connectionLock.Unlock()
return errListenerConnClosed
}
l.err = errListenerConnClosed
l.connectionLock.Unlock()
// We can't send anything on the connection without holding senderLock.
// Simply close the net.Conn to wake up everyone operating on it.
return l.cn.c.Close()
}
// Err returns the reason the connection was closed. It is not safe to call
// this function until l.Notify has been closed.
func (l *ListenerConn) Err() error {
return l.err
}
var errListenerClosed = errors.New("pq: Listener has been closed")
// ErrChannelAlreadyOpen is returned from Listen when a channel is already
// open.
var ErrChannelAlreadyOpen = errors.New("pq: channel is already open")
// ErrChannelNotOpen is returned from Unlisten when a channel is not open.
var ErrChannelNotOpen = errors.New("pq: channel is not open")
// ListenerEventType is an enumeration of listener event types.
type ListenerEventType int
const (
// ListenerEventConnected is emitted only when the database connection
// has been initially initialized. The err argument of the callback
// will always be nil.
ListenerEventConnected ListenerEventType = iota
// ListenerEventDisconnected is emitted after a database connection has
// been lost, either because of an error or because Close has been
// called. The err argument will be set to the reason the database
// connection was lost.
ListenerEventDisconnected
// ListenerEventReconnected is emitted after a database connection has
// been re-established after connection loss. The err argument of the
// callback will always be nil. After this event has been emitted, a
// nil pq.Notification is sent on the Listener.Notify channel.
ListenerEventReconnected
// ListenerEventConnectionAttemptFailed is emitted after a connection
// to the database was attempted, but failed. The err argument will be
// set to an error describing why the connection attempt did not
// succeed.
ListenerEventConnectionAttemptFailed
)
// EventCallbackType is the event callback type. See also ListenerEventType
// constants' documentation.
type EventCallbackType func(event ListenerEventType, err error)
// Listener provides an interface for listening to notifications from a
// PostgreSQL database. For general usage information, see section
// "Notifications".
//
// Listener can safely be used from concurrently running goroutines.
type Listener struct {
// Channel for receiving notifications from the database. In some cases a
// nil value will be sent. See section "Notifications" above.
Notify chan *Notification
name string
minReconnectInterval time.Duration
maxReconnectInterval time.Duration
dialer Dialer
eventCallback EventCallbackType
lock sync.Mutex
isClosed bool
reconnectCond *sync.Cond
cn *ListenerConn
connNotificationChan <-chan *Notification
channels map[string]struct{}
}
// NewListener creates a new database connection dedicated to LISTEN / NOTIFY.
//
// name should be set to a connection string to be used to establish the
// database connection (see section "Connection String Parameters" above).
//
// minReconnectInterval controls the duration to wait before trying to
// re-establish the database connection after connection loss. After each
// consecutive failure this interval is doubled, until maxReconnectInterval is
// reached. Successfully completing the connection establishment procedure
// resets the interval back to minReconnectInterval.
//
// The last parameter eventCallback can be set to a function which will be
// called by the Listener when the state of the underlying database connection
// changes. This callback will be called by the goroutine which dispatches the
// notifications over the Notify channel, so you should try to avoid doing
// potentially time-consuming operations from the callback.
func NewListener(name string,
minReconnectInterval time.Duration,
maxReconnectInterval time.Duration,
eventCallback EventCallbackType) *Listener {
return NewDialListener(defaultDialer{}, name, minReconnectInterval, maxReconnectInterval, eventCallback)
}
// NewDialListener is like NewListener but it takes a Dialer.
func NewDialListener(d Dialer,
name string,
minReconnectInterval time.Duration,
maxReconnectInterval time.Duration,
eventCallback EventCallbackType) *Listener {
l := &Listener{
name: name,
minReconnectInterval: minReconnectInterval,
maxReconnectInterval: maxReconnectInterval,
dialer: d,
eventCallback: eventCallback,
channels: make(map[string]struct{}),
Notify: make(chan *Notification, 32),
}
l.reconnectCond = sync.NewCond(&l.lock)
go l.listenerMain()
return l
}
// NotificationChannel returns the notification channel for this listener.
// This is the same channel as Notify, and will not be recreated during the
// life time of the Listener.
func (l *Listener) NotificationChannel() <-chan *Notification {
return l.Notify
}
// Listen starts listening for notifications on a channel. Calls to this
// function will block until an acknowledgement has been received from the
// server. Note that Listener automatically re-establishes the connection
// after connection loss, so this function may block indefinitely if the
// connection can not be re-established.
//
// Listen will only fail in three conditions:
// 1) The channel is already open. The returned error will be
// ErrChannelAlreadyOpen.
// 2) The query was executed on the remote server, but PostgreSQL returned an
// error message in response to the query. The returned error will be a
// pq.Error containing the information the server supplied.
// 3) Close is called on the Listener before the request could be completed.
//
// The channel name is case-sensitive.
func (l *Listener) Listen(channel string) error {
l.lock.Lock()
defer l.lock.Unlock()
if l.isClosed {
return errListenerClosed
}
// The server allows you to issue a LISTEN on a channel which is already
// open, but it seems useful to be able to detect this case to spot for
// mistakes in application logic. If the application genuinely does't
// care, it can check the exported error and ignore it.
_, exists := l.channels[channel]
if exists {
return ErrChannelAlreadyOpen
}
if l.cn != nil {
// If gotResponse is true but error is set, the query was executed on
// the remote server, but resulted in an error. This should be
// relatively rare, so it's fine if we just pass the error to our
// caller. However, if gotResponse is false, we could not complete the
// query on the remote server and our underlying connection is about
// to go away, so we only add relname to l.channels, and wait for
// resync() to take care of the rest.
gotResponse, err := l.cn.Listen(channel)
if gotResponse && err != nil {
return err
}
}
l.channels[channel] = struct{}{}
for l.cn == nil {
l.reconnectCond.Wait()
// we let go of the mutex for a while
if l.isClosed {
return errListenerClosed
}
}
return nil
}
// Unlisten removes a channel from the Listener's channel list. Returns
// ErrChannelNotOpen if the Listener is not listening on the specified channel.
// Returns immediately with no error if there is no connection. Note that you
// might still get notifications for this channel even after Unlisten has
// returned.
//
// The channel name is case-sensitive.
func (l *Listener) Unlisten(channel string) error {
l.lock.Lock()
defer l.lock.Unlock()
if l.isClosed {
return errListenerClosed
}
// Similarly to LISTEN, this is not an error in Postgres, but it seems
// useful to distinguish from the normal conditions.
_, exists := l.channels[channel]
if !exists {
return ErrChannelNotOpen
}
if l.cn != nil {
// Similarly to Listen (see comment in that function), the caller
// should only be bothered with an error if it came from the backend as
// a response to our query.
gotResponse, err := l.cn.Unlisten(channel)
if gotResponse && err != nil {
return err
}
}
// Don't bother waiting for resync if there's no connection.
delete(l.channels, channel)
return nil
}
// UnlistenAll removes all channels from the Listener's channel list. Returns
// immediately with no error if there is no connection. Note that you might
// still get notifications for any of the deleted channels even after
// UnlistenAll has returned.
func (l *Listener) UnlistenAll() error {
l.lock.Lock()
defer l.lock.Unlock()
if l.isClosed {
return errListenerClosed
}
if l.cn != nil {
// Similarly to Listen (see comment in that function), the caller
// should only be bothered with an error if it came from the backend as
// a response to our query.
gotResponse, err := l.cn.UnlistenAll()
if gotResponse && err != nil {
return err
}
}
// Don't bother waiting for resync if there's no connection.
l.channels = make(map[string]struct{})
return nil
}
// Ping the remote server to make sure it's alive. Non-nil return value means
// that there is no active connection.
func (l *Listener) Ping() error {
l.lock.Lock()
defer l.lock.Unlock()
if l.isClosed {
return errListenerClosed
}
if l.cn == nil {
return errors.New("no connection")
}
return l.cn.Ping()
}
// Clean up after losing the server connection. Returns l.cn.Err(), which
// should have the reason the connection was lost.
func (l *Listener) disconnectCleanup() error {
l.lock.Lock()
defer l.lock.Unlock()
// sanity check; can't look at Err() until the channel has been closed
select {
case _, ok := <-l.connNotificationChan:
if ok {
panic("connNotificationChan not closed")
}
default:
panic("connNotificationChan not closed")
}
err := l.cn.Err()
l.cn.Close()
l.cn = nil
return err
}
// Synchronize the list of channels we want to be listening on with the server
// after the connection has been established.
func (l *Listener) resync(cn *ListenerConn, notificationChan <-chan *Notification) error {
doneChan := make(chan error)
go func(notificationChan <-chan *Notification) {
for channel := range l.channels {
// If we got a response, return that error to our caller as it's
// going to be more descriptive than cn.Err().
gotResponse, err := cn.Listen(channel)
if gotResponse && err != nil {
doneChan <- err
return
}
// If we couldn't reach the server, wait for notificationChan to
// close and then return the error message from the connection, as
// per ListenerConn's interface.
if err != nil {
for range notificationChan {
}
doneChan <- cn.Err()
return
}
}
doneChan <- nil
}(notificationChan)
// Ignore notifications while synchronization is going on to avoid
// deadlocks. We have to send a nil notification over Notify anyway as
// we can't possibly know which notifications (if any) were lost while
// the connection was down, so there's no reason to try and process
// these messages at all.
for {
select {
case _, ok := <-notificationChan:
if !ok {
notificationChan = nil
}
case err := <-doneChan:
return err
}
}
}
// caller should NOT be holding l.lock
func (l *Listener) closed() bool {
l.lock.Lock()
defer l.lock.Unlock()
return l.isClosed
}
func (l *Listener) connect() error {
notificationChan := make(chan *Notification, 32)
cn, err := newDialListenerConn(l.dialer, l.name, notificationChan)
if err != nil {
return err
}
l.lock.Lock()
defer l.lock.Unlock()
err = l.resync(cn, notificationChan)
if err != nil {
cn.Close()
return err
}
l.cn = cn
l.connNotificationChan = notificationChan
l.reconnectCond.Broadcast()
return nil
}
// Close disconnects the Listener from the database and shuts it down.
// Subsequent calls to its methods will return an error. Close returns an
// error if the connection has already been closed.
func (l *Listener) Close() error {
l.lock.Lock()
defer l.lock.Unlock()
if l.isClosed {
return errListenerClosed
}
if l.cn != nil {
l.cn.Close()
}
l.isClosed = true
// Unblock calls to Listen()
l.reconnectCond.Broadcast()
return nil
}
func (l *Listener) emitEvent(event ListenerEventType, err error) {
if l.eventCallback != nil {
l.eventCallback(event, err)
}
}
// Main logic here: maintain a connection to the server when possible, wait
// for notifications and emit events.
func (l *Listener) listenerConnLoop() {
var nextReconnect time.Time
reconnectInterval := l.minReconnectInterval
for {
for {
err := l.connect()
if err == nil {
break
}
if l.closed() {
return
}
l.emitEvent(ListenerEventConnectionAttemptFailed, err)
time.Sleep(reconnectInterval)
reconnectInterval *= 2
if reconnectInterval > l.maxReconnectInterval {
reconnectInterval = l.maxReconnectInterval
}
}
if nextReconnect.IsZero() {
l.emitEvent(ListenerEventConnected, nil)
} else {
l.emitEvent(ListenerEventReconnected, nil)
l.Notify <- nil
}
reconnectInterval = l.minReconnectInterval
nextReconnect = time.Now().Add(reconnectInterval)
for {
notification, ok := <-l.connNotificationChan
if !ok {
// lost connection, loop again
break
}
l.Notify <- notification
}
err := l.disconnectCleanup()
if l.closed() {
return
}
l.emitEvent(ListenerEventDisconnected, err)
time.Sleep(time.Until(nextReconnect))
}
}
func (l *Listener) listenerMain() {
l.listenerConnLoop()
close(l.Notify)
}

6
vendor/github.com/lib/pq/oid/doc.go generated vendored Normal file
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// Package oid contains OID constants
// as defined by the Postgres server.
package oid
// Oid is a Postgres Object ID.
type Oid uint32

93
vendor/github.com/lib/pq/oid/gen.go generated vendored Normal file
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@ -0,0 +1,93 @@
// +build ignore
// Generate the table of OID values
// Run with 'go run gen.go'.
package main
import (
"database/sql"
"fmt"
"log"
"os"
"os/exec"
"strings"
_ "github.com/lib/pq"
)
// OID represent a postgres Object Identifier Type.
type OID struct {
ID int
Type string
}
// Name returns an upper case version of the oid type.
func (o OID) Name() string {
return strings.ToUpper(o.Type)
}
func main() {
datname := os.Getenv("PGDATABASE")
sslmode := os.Getenv("PGSSLMODE")
if datname == "" {
os.Setenv("PGDATABASE", "pqgotest")
}
if sslmode == "" {
os.Setenv("PGSSLMODE", "disable")
}
db, err := sql.Open("postgres", "")
if err != nil {
log.Fatal(err)
}
rows, err := db.Query(`
SELECT typname, oid
FROM pg_type WHERE oid < 10000
ORDER BY oid;
`)
if err != nil {
log.Fatal(err)
}
oids := make([]*OID, 0)
for rows.Next() {
var oid OID
if err = rows.Scan(&oid.Type, &oid.ID); err != nil {
log.Fatal(err)
}
oids = append(oids, &oid)
}
if err = rows.Err(); err != nil {
log.Fatal(err)
}
cmd := exec.Command("gofmt")
cmd.Stderr = os.Stderr
w, err := cmd.StdinPipe()
if err != nil {
log.Fatal(err)
}
f, err := os.Create("types.go")
if err != nil {
log.Fatal(err)
}
cmd.Stdout = f
err = cmd.Start()
if err != nil {
log.Fatal(err)
}
fmt.Fprintln(w, "// Code generated by gen.go. DO NOT EDIT.")
fmt.Fprintln(w, "\npackage oid")
fmt.Fprintln(w, "const (")
for _, oid := range oids {
fmt.Fprintf(w, "T_%s Oid = %d\n", oid.Type, oid.ID)
}
fmt.Fprintln(w, ")")
fmt.Fprintln(w, "var TypeName = map[Oid]string{")
for _, oid := range oids {
fmt.Fprintf(w, "T_%s: \"%s\",\n", oid.Type, oid.Name())
}
fmt.Fprintln(w, "}")
w.Close()
cmd.Wait()
}

343
vendor/github.com/lib/pq/oid/types.go generated vendored Normal file
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@ -0,0 +1,343 @@
// Code generated by gen.go. DO NOT EDIT.
package oid
const (
T_bool Oid = 16
T_bytea Oid = 17
T_char Oid = 18
T_name Oid = 19
T_int8 Oid = 20
T_int2 Oid = 21
T_int2vector Oid = 22
T_int4 Oid = 23
T_regproc Oid = 24
T_text Oid = 25
T_oid Oid = 26
T_tid Oid = 27
T_xid Oid = 28
T_cid Oid = 29
T_oidvector Oid = 30
T_pg_ddl_command Oid = 32
T_pg_type Oid = 71
T_pg_attribute Oid = 75
T_pg_proc Oid = 81
T_pg_class Oid = 83
T_json Oid = 114
T_xml Oid = 142
T__xml Oid = 143
T_pg_node_tree Oid = 194
T__json Oid = 199
T_smgr Oid = 210
T_index_am_handler Oid = 325
T_point Oid = 600
T_lseg Oid = 601
T_path Oid = 602
T_box Oid = 603
T_polygon Oid = 604
T_line Oid = 628
T__line Oid = 629
T_cidr Oid = 650
T__cidr Oid = 651
T_float4 Oid = 700
T_float8 Oid = 701
T_abstime Oid = 702
T_reltime Oid = 703
T_tinterval Oid = 704
T_unknown Oid = 705
T_circle Oid = 718
T__circle Oid = 719
T_money Oid = 790
T__money Oid = 791
T_macaddr Oid = 829
T_inet Oid = 869
T__bool Oid = 1000
T__bytea Oid = 1001
T__char Oid = 1002
T__name Oid = 1003
T__int2 Oid = 1005
T__int2vector Oid = 1006
T__int4 Oid = 1007
T__regproc Oid = 1008
T__text Oid = 1009
T__tid Oid = 1010
T__xid Oid = 1011
T__cid Oid = 1012
T__oidvector Oid = 1013
T__bpchar Oid = 1014
T__varchar Oid = 1015
T__int8 Oid = 1016
T__point Oid = 1017
T__lseg Oid = 1018
T__path Oid = 1019
T__box Oid = 1020
T__float4 Oid = 1021
T__float8 Oid = 1022
T__abstime Oid = 1023
T__reltime Oid = 1024
T__tinterval Oid = 1025
T__polygon Oid = 1027
T__oid Oid = 1028
T_aclitem Oid = 1033
T__aclitem Oid = 1034
T__macaddr Oid = 1040
T__inet Oid = 1041
T_bpchar Oid = 1042
T_varchar Oid = 1043
T_date Oid = 1082
T_time Oid = 1083
T_timestamp Oid = 1114
T__timestamp Oid = 1115
T__date Oid = 1182
T__time Oid = 1183
T_timestamptz Oid = 1184
T__timestamptz Oid = 1185
T_interval Oid = 1186
T__interval Oid = 1187
T__numeric Oid = 1231
T_pg_database Oid = 1248
T__cstring Oid = 1263
T_timetz Oid = 1266
T__timetz Oid = 1270
T_bit Oid = 1560
T__bit Oid = 1561
T_varbit Oid = 1562
T__varbit Oid = 1563
T_numeric Oid = 1700
T_refcursor Oid = 1790
T__refcursor Oid = 2201
T_regprocedure Oid = 2202
T_regoper Oid = 2203
T_regoperator Oid = 2204
T_regclass Oid = 2205
T_regtype Oid = 2206
T__regprocedure Oid = 2207
T__regoper Oid = 2208
T__regoperator Oid = 2209
T__regclass Oid = 2210
T__regtype Oid = 2211
T_record Oid = 2249
T_cstring Oid = 2275
T_any Oid = 2276
T_anyarray Oid = 2277
T_void Oid = 2278
T_trigger Oid = 2279
T_language_handler Oid = 2280
T_internal Oid = 2281
T_opaque Oid = 2282
T_anyelement Oid = 2283
T__record Oid = 2287
T_anynonarray Oid = 2776
T_pg_authid Oid = 2842
T_pg_auth_members Oid = 2843
T__txid_snapshot Oid = 2949
T_uuid Oid = 2950
T__uuid Oid = 2951
T_txid_snapshot Oid = 2970
T_fdw_handler Oid = 3115
T_pg_lsn Oid = 3220
T__pg_lsn Oid = 3221
T_tsm_handler Oid = 3310
T_anyenum Oid = 3500
T_tsvector Oid = 3614
T_tsquery Oid = 3615
T_gtsvector Oid = 3642
T__tsvector Oid = 3643
T__gtsvector Oid = 3644
T__tsquery Oid = 3645
T_regconfig Oid = 3734
T__regconfig Oid = 3735
T_regdictionary Oid = 3769
T__regdictionary Oid = 3770
T_jsonb Oid = 3802
T__jsonb Oid = 3807
T_anyrange Oid = 3831
T_event_trigger Oid = 3838
T_int4range Oid = 3904
T__int4range Oid = 3905
T_numrange Oid = 3906
T__numrange Oid = 3907
T_tsrange Oid = 3908
T__tsrange Oid = 3909
T_tstzrange Oid = 3910
T__tstzrange Oid = 3911
T_daterange Oid = 3912
T__daterange Oid = 3913
T_int8range Oid = 3926
T__int8range Oid = 3927
T_pg_shseclabel Oid = 4066
T_regnamespace Oid = 4089
T__regnamespace Oid = 4090
T_regrole Oid = 4096
T__regrole Oid = 4097
)
var TypeName = map[Oid]string{
T_bool: "BOOL",
T_bytea: "BYTEA",
T_char: "CHAR",
T_name: "NAME",
T_int8: "INT8",
T_int2: "INT2",
T_int2vector: "INT2VECTOR",
T_int4: "INT4",
T_regproc: "REGPROC",
T_text: "TEXT",
T_oid: "OID",
T_tid: "TID",
T_xid: "XID",
T_cid: "CID",
T_oidvector: "OIDVECTOR",
T_pg_ddl_command: "PG_DDL_COMMAND",
T_pg_type: "PG_TYPE",
T_pg_attribute: "PG_ATTRIBUTE",
T_pg_proc: "PG_PROC",
T_pg_class: "PG_CLASS",
T_json: "JSON",
T_xml: "XML",
T__xml: "_XML",
T_pg_node_tree: "PG_NODE_TREE",
T__json: "_JSON",
T_smgr: "SMGR",
T_index_am_handler: "INDEX_AM_HANDLER",
T_point: "POINT",
T_lseg: "LSEG",
T_path: "PATH",
T_box: "BOX",
T_polygon: "POLYGON",
T_line: "LINE",
T__line: "_LINE",
T_cidr: "CIDR",
T__cidr: "_CIDR",
T_float4: "FLOAT4",
T_float8: "FLOAT8",
T_abstime: "ABSTIME",
T_reltime: "RELTIME",
T_tinterval: "TINTERVAL",
T_unknown: "UNKNOWN",
T_circle: "CIRCLE",
T__circle: "_CIRCLE",
T_money: "MONEY",
T__money: "_MONEY",
T_macaddr: "MACADDR",
T_inet: "INET",
T__bool: "_BOOL",
T__bytea: "_BYTEA",
T__char: "_CHAR",
T__name: "_NAME",
T__int2: "_INT2",
T__int2vector: "_INT2VECTOR",
T__int4: "_INT4",
T__regproc: "_REGPROC",
T__text: "_TEXT",
T__tid: "_TID",
T__xid: "_XID",
T__cid: "_CID",
T__oidvector: "_OIDVECTOR",
T__bpchar: "_BPCHAR",
T__varchar: "_VARCHAR",
T__int8: "_INT8",
T__point: "_POINT",
T__lseg: "_LSEG",
T__path: "_PATH",
T__box: "_BOX",
T__float4: "_FLOAT4",
T__float8: "_FLOAT8",
T__abstime: "_ABSTIME",
T__reltime: "_RELTIME",
T__tinterval: "_TINTERVAL",
T__polygon: "_POLYGON",
T__oid: "_OID",
T_aclitem: "ACLITEM",
T__aclitem: "_ACLITEM",
T__macaddr: "_MACADDR",
T__inet: "_INET",
T_bpchar: "BPCHAR",
T_varchar: "VARCHAR",
T_date: "DATE",
T_time: "TIME",
T_timestamp: "TIMESTAMP",
T__timestamp: "_TIMESTAMP",
T__date: "_DATE",
T__time: "_TIME",
T_timestamptz: "TIMESTAMPTZ",
T__timestamptz: "_TIMESTAMPTZ",
T_interval: "INTERVAL",
T__interval: "_INTERVAL",
T__numeric: "_NUMERIC",
T_pg_database: "PG_DATABASE",
T__cstring: "_CSTRING",
T_timetz: "TIMETZ",
T__timetz: "_TIMETZ",
T_bit: "BIT",
T__bit: "_BIT",
T_varbit: "VARBIT",
T__varbit: "_VARBIT",
T_numeric: "NUMERIC",
T_refcursor: "REFCURSOR",
T__refcursor: "_REFCURSOR",
T_regprocedure: "REGPROCEDURE",
T_regoper: "REGOPER",
T_regoperator: "REGOPERATOR",
T_regclass: "REGCLASS",
T_regtype: "REGTYPE",
T__regprocedure: "_REGPROCEDURE",
T__regoper: "_REGOPER",
T__regoperator: "_REGOPERATOR",
T__regclass: "_REGCLASS",
T__regtype: "_REGTYPE",
T_record: "RECORD",
T_cstring: "CSTRING",
T_any: "ANY",
T_anyarray: "ANYARRAY",
T_void: "VOID",
T_trigger: "TRIGGER",
T_language_handler: "LANGUAGE_HANDLER",
T_internal: "INTERNAL",
T_opaque: "OPAQUE",
T_anyelement: "ANYELEMENT",
T__record: "_RECORD",
T_anynonarray: "ANYNONARRAY",
T_pg_authid: "PG_AUTHID",
T_pg_auth_members: "PG_AUTH_MEMBERS",
T__txid_snapshot: "_TXID_SNAPSHOT",
T_uuid: "UUID",
T__uuid: "_UUID",
T_txid_snapshot: "TXID_SNAPSHOT",
T_fdw_handler: "FDW_HANDLER",
T_pg_lsn: "PG_LSN",
T__pg_lsn: "_PG_LSN",
T_tsm_handler: "TSM_HANDLER",
T_anyenum: "ANYENUM",
T_tsvector: "TSVECTOR",
T_tsquery: "TSQUERY",
T_gtsvector: "GTSVECTOR",
T__tsvector: "_TSVECTOR",
T__gtsvector: "_GTSVECTOR",
T__tsquery: "_TSQUERY",
T_regconfig: "REGCONFIG",
T__regconfig: "_REGCONFIG",
T_regdictionary: "REGDICTIONARY",
T__regdictionary: "_REGDICTIONARY",
T_jsonb: "JSONB",
T__jsonb: "_JSONB",
T_anyrange: "ANYRANGE",
T_event_trigger: "EVENT_TRIGGER",
T_int4range: "INT4RANGE",
T__int4range: "_INT4RANGE",
T_numrange: "NUMRANGE",
T__numrange: "_NUMRANGE",
T_tsrange: "TSRANGE",
T__tsrange: "_TSRANGE",
T_tstzrange: "TSTZRANGE",
T__tstzrange: "_TSTZRANGE",
T_daterange: "DATERANGE",
T__daterange: "_DATERANGE",
T_int8range: "INT8RANGE",
T__int8range: "_INT8RANGE",
T_pg_shseclabel: "PG_SHSECLABEL",
T_regnamespace: "REGNAMESPACE",
T__regnamespace: "_REGNAMESPACE",
T_regrole: "REGROLE",
T__regrole: "_REGROLE",
}

93
vendor/github.com/lib/pq/rows.go generated vendored Normal file
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@ -0,0 +1,93 @@
package pq
import (
"math"
"reflect"
"time"
"github.com/lib/pq/oid"
)
const headerSize = 4
type fieldDesc struct {
// The object ID of the data type.
OID oid.Oid
// The data type size (see pg_type.typlen).
// Note that negative values denote variable-width types.
Len int
// The type modifier (see pg_attribute.atttypmod).
// The meaning of the modifier is type-specific.
Mod int
}
func (fd fieldDesc) Type() reflect.Type {
switch fd.OID {
case oid.T_int8:
return reflect.TypeOf(int64(0))
case oid.T_int4:
return reflect.TypeOf(int32(0))
case oid.T_int2:
return reflect.TypeOf(int16(0))
case oid.T_varchar, oid.T_text:
return reflect.TypeOf("")
case oid.T_bool:
return reflect.TypeOf(false)
case oid.T_date, oid.T_time, oid.T_timetz, oid.T_timestamp, oid.T_timestamptz:
return reflect.TypeOf(time.Time{})
case oid.T_bytea:
return reflect.TypeOf([]byte(nil))
default:
return reflect.TypeOf(new(interface{})).Elem()
}
}
func (fd fieldDesc) Name() string {
return oid.TypeName[fd.OID]
}
func (fd fieldDesc) Length() (length int64, ok bool) {
switch fd.OID {
case oid.T_text, oid.T_bytea:
return math.MaxInt64, true
case oid.T_varchar, oid.T_bpchar:
return int64(fd.Mod - headerSize), true
default:
return 0, false
}
}
func (fd fieldDesc) PrecisionScale() (precision, scale int64, ok bool) {
switch fd.OID {
case oid.T_numeric, oid.T__numeric:
mod := fd.Mod - headerSize
precision = int64((mod >> 16) & 0xffff)
scale = int64(mod & 0xffff)
return precision, scale, true
default:
return 0, 0, false
}
}
// ColumnTypeScanType returns the value type that can be used to scan types into.
func (rs *rows) ColumnTypeScanType(index int) reflect.Type {
return rs.colTyps[index].Type()
}
// ColumnTypeDatabaseTypeName return the database system type name.
func (rs *rows) ColumnTypeDatabaseTypeName(index int) string {
return rs.colTyps[index].Name()
}
// ColumnTypeLength returns the length of the column type if the column is a
// variable length type. If the column is not a variable length type ok
// should return false.
func (rs *rows) ColumnTypeLength(index int) (length int64, ok bool) {
return rs.colTyps[index].Length()
}
// ColumnTypePrecisionScale should return the precision and scale for decimal
// types. If not applicable, ok should be false.
func (rs *rows) ColumnTypePrecisionScale(index int) (precision, scale int64, ok bool) {
return rs.colTyps[index].PrecisionScale()
}

169
vendor/github.com/lib/pq/ssl.go generated vendored Normal file
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package pq
import (
"crypto/tls"
"crypto/x509"
"io/ioutil"
"net"
"os"
"os/user"
"path/filepath"
)
// ssl generates a function to upgrade a net.Conn based on the "sslmode" and
// related settings. The function is nil when no upgrade should take place.
func ssl(o values) (func(net.Conn) (net.Conn, error), error) {
verifyCaOnly := false
tlsConf := tls.Config{}
switch mode := o["sslmode"]; mode {
// "require" is the default.
case "", "require":
// We must skip TLS's own verification since it requires full
// verification since Go 1.3.
tlsConf.InsecureSkipVerify = true
// From http://www.postgresql.org/docs/current/static/libpq-ssl.html:
//
// Note: For backwards compatibility with earlier versions of
// PostgreSQL, if a root CA file exists, the behavior of
// sslmode=require will be the same as that of verify-ca, meaning the
// server certificate is validated against the CA. Relying on this
// behavior is discouraged, and applications that need certificate
// validation should always use verify-ca or verify-full.
if sslrootcert, ok := o["sslrootcert"]; ok {
if _, err := os.Stat(sslrootcert); err == nil {
verifyCaOnly = true
} else {
delete(o, "sslrootcert")
}
}
case "verify-ca":
// We must skip TLS's own verification since it requires full
// verification since Go 1.3.
tlsConf.InsecureSkipVerify = true
verifyCaOnly = true
case "verify-full":
tlsConf.ServerName = o["host"]
case "disable":
return nil, nil
default:
return nil, fmterrorf(`unsupported sslmode %q; only "require" (default), "verify-full", "verify-ca", and "disable" supported`, mode)
}
err := sslClientCertificates(&tlsConf, o)
if err != nil {
return nil, err
}
err = sslCertificateAuthority(&tlsConf, o)
if err != nil {
return nil, err
}
sslRenegotiation(&tlsConf)
return func(conn net.Conn) (net.Conn, error) {
client := tls.Client(conn, &tlsConf)
if verifyCaOnly {
err := sslVerifyCertificateAuthority(client, &tlsConf)
if err != nil {
return nil, err
}
}
return client, nil
}, nil
}
// sslClientCertificates adds the certificate specified in the "sslcert" and
// "sslkey" settings, or if they aren't set, from the .postgresql directory
// in the user's home directory. The configured files must exist and have
// the correct permissions.
func sslClientCertificates(tlsConf *tls.Config, o values) error {
// user.Current() might fail when cross-compiling. We have to ignore the
// error and continue without home directory defaults, since we wouldn't
// know from where to load them.
user, _ := user.Current()
// In libpq, the client certificate is only loaded if the setting is not blank.
//
// https://github.com/postgres/postgres/blob/REL9_6_2/src/interfaces/libpq/fe-secure-openssl.c#L1036-L1037
sslcert := o["sslcert"]
if len(sslcert) == 0 && user != nil {
sslcert = filepath.Join(user.HomeDir, ".postgresql", "postgresql.crt")
}
// https://github.com/postgres/postgres/blob/REL9_6_2/src/interfaces/libpq/fe-secure-openssl.c#L1045
if len(sslcert) == 0 {
return nil
}
// https://github.com/postgres/postgres/blob/REL9_6_2/src/interfaces/libpq/fe-secure-openssl.c#L1050:L1054
if _, err := os.Stat(sslcert); os.IsNotExist(err) {
return nil
} else if err != nil {
return err
}
// In libpq, the ssl key is only loaded if the setting is not blank.
//
// https://github.com/postgres/postgres/blob/REL9_6_2/src/interfaces/libpq/fe-secure-openssl.c#L1123-L1222
sslkey := o["sslkey"]
if len(sslkey) == 0 && user != nil {
sslkey = filepath.Join(user.HomeDir, ".postgresql", "postgresql.key")
}
if len(sslkey) > 0 {
if err := sslKeyPermissions(sslkey); err != nil {
return err
}
}
cert, err := tls.LoadX509KeyPair(sslcert, sslkey)
if err != nil {
return err
}
tlsConf.Certificates = []tls.Certificate{cert}
return nil
}
// sslCertificateAuthority adds the RootCA specified in the "sslrootcert" setting.
func sslCertificateAuthority(tlsConf *tls.Config, o values) error {
// In libpq, the root certificate is only loaded if the setting is not blank.
//
// https://github.com/postgres/postgres/blob/REL9_6_2/src/interfaces/libpq/fe-secure-openssl.c#L950-L951
if sslrootcert := o["sslrootcert"]; len(sslrootcert) > 0 {
tlsConf.RootCAs = x509.NewCertPool()
cert, err := ioutil.ReadFile(sslrootcert)
if err != nil {
return err
}
if !tlsConf.RootCAs.AppendCertsFromPEM(cert) {
return fmterrorf("couldn't parse pem in sslrootcert")
}
}
return nil
}
// sslVerifyCertificateAuthority carries out a TLS handshake to the server and
// verifies the presented certificate against the CA, i.e. the one specified in
// sslrootcert or the system CA if sslrootcert was not specified.
func sslVerifyCertificateAuthority(client *tls.Conn, tlsConf *tls.Config) error {
err := client.Handshake()
if err != nil {
return err
}
certs := client.ConnectionState().PeerCertificates
opts := x509.VerifyOptions{
DNSName: client.ConnectionState().ServerName,
Intermediates: x509.NewCertPool(),
Roots: tlsConf.RootCAs,
}
for i, cert := range certs {
if i == 0 {
continue
}
opts.Intermediates.AddCert(cert)
}
_, err = certs[0].Verify(opts)
return err
}

14
vendor/github.com/lib/pq/ssl_go1.7.go generated vendored Normal file
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// +build go1.7
package pq
import "crypto/tls"
// Accept renegotiation requests initiated by the backend.
//
// Renegotiation was deprecated then removed from PostgreSQL 9.5, but
// the default configuration of older versions has it enabled. Redshift
// also initiates renegotiations and cannot be reconfigured.
func sslRenegotiation(conf *tls.Config) {
conf.Renegotiation = tls.RenegotiateFreelyAsClient
}

20
vendor/github.com/lib/pq/ssl_permissions.go generated vendored Normal file
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// +build !windows
package pq
import "os"
// sslKeyPermissions checks the permissions on user-supplied ssl key files.
// The key file should have very little access.
//
// libpq does not check key file permissions on Windows.
func sslKeyPermissions(sslkey string) error {
info, err := os.Stat(sslkey)
if err != nil {
return err
}
if info.Mode().Perm()&0077 != 0 {
return ErrSSLKeyHasWorldPermissions
}
return nil
}

8
vendor/github.com/lib/pq/ssl_renegotiation.go generated vendored Normal file
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// +build !go1.7
package pq
import "crypto/tls"
// Renegotiation is not supported by crypto/tls until Go 1.7.
func sslRenegotiation(*tls.Config) {}

9
vendor/github.com/lib/pq/ssl_windows.go generated vendored Normal file
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// +build windows
package pq
// sslKeyPermissions checks the permissions on user-supplied ssl key files.
// The key file should have very little access.
//
// libpq does not check key file permissions on Windows.
func sslKeyPermissions(string) error { return nil }

76
vendor/github.com/lib/pq/url.go generated vendored Normal file
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package pq
import (
"fmt"
"net"
nurl "net/url"
"sort"
"strings"
)
// ParseURL no longer needs to be used by clients of this library since supplying a URL as a
// connection string to sql.Open() is now supported:
//
// sql.Open("postgres", "postgres://bob:secret@1.2.3.4:5432/mydb?sslmode=verify-full")
//
// It remains exported here for backwards-compatibility.
//
// ParseURL converts a url to a connection string for driver.Open.
// Example:
//
// "postgres://bob:secret@1.2.3.4:5432/mydb?sslmode=verify-full"
//
// converts to:
//
// "user=bob password=secret host=1.2.3.4 port=5432 dbname=mydb sslmode=verify-full"
//
// A minimal example:
//
// "postgres://"
//
// This will be blank, causing driver.Open to use all of the defaults
func ParseURL(url string) (string, error) {
u, err := nurl.Parse(url)
if err != nil {
return "", err
}
if u.Scheme != "postgres" && u.Scheme != "postgresql" {
return "", fmt.Errorf("invalid connection protocol: %s", u.Scheme)
}
var kvs []string
escaper := strings.NewReplacer(` `, `\ `, `'`, `\'`, `\`, `\\`)
accrue := func(k, v string) {
if v != "" {
kvs = append(kvs, k+"="+escaper.Replace(v))
}
}
if u.User != nil {
v := u.User.Username()
accrue("user", v)
v, _ = u.User.Password()
accrue("password", v)
}
if host, port, err := net.SplitHostPort(u.Host); err != nil {
accrue("host", u.Host)
} else {
accrue("host", host)
accrue("port", port)
}
if u.Path != "" {
accrue("dbname", u.Path[1:])
}
q := u.Query()
for k := range q {
accrue(k, q.Get(k))
}
sort.Strings(kvs) // Makes testing easier (not a performance concern)
return strings.Join(kvs, " "), nil
}

24
vendor/github.com/lib/pq/user_posix.go generated vendored Normal file
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// Package pq is a pure Go Postgres driver for the database/sql package.
// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris rumprun
package pq
import (
"os"
"os/user"
)
func userCurrent() (string, error) {
u, err := user.Current()
if err == nil {
return u.Username, nil
}
name := os.Getenv("USER")
if name != "" {
return name, nil
}
return "", ErrCouldNotDetectUsername
}

27
vendor/github.com/lib/pq/user_windows.go generated vendored Normal file
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// Package pq is a pure Go Postgres driver for the database/sql package.
package pq
import (
"path/filepath"
"syscall"
)
// Perform Windows user name lookup identically to libpq.
//
// The PostgreSQL code makes use of the legacy Win32 function
// GetUserName, and that function has not been imported into stock Go.
// GetUserNameEx is available though, the difference being that a
// wider range of names are available. To get the output to be the
// same as GetUserName, only the base (or last) component of the
// result is returned.
func userCurrent() (string, error) {
pw_name := make([]uint16, 128)
pwname_size := uint32(len(pw_name)) - 1
err := syscall.GetUserNameEx(syscall.NameSamCompatible, &pw_name[0], &pwname_size)
if err != nil {
return "", ErrCouldNotDetectUsername
}
s := syscall.UTF16ToString(pw_name)
u := filepath.Base(s)
return u, nil
}

23
vendor/github.com/lib/pq/uuid.go generated vendored Normal file
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package pq
import (
"encoding/hex"
"fmt"
)
// decodeUUIDBinary interprets the binary format of a uuid, returning it in text format.
func decodeUUIDBinary(src []byte) ([]byte, error) {
if len(src) != 16 {
return nil, fmt.Errorf("pq: unable to decode uuid; bad length: %d", len(src))
}
dst := make([]byte, 36)
dst[8], dst[13], dst[18], dst[23] = '-', '-', '-', '-'
hex.Encode(dst[0:], src[0:4])
hex.Encode(dst[9:], src[4:6])
hex.Encode(dst[14:], src[6:8])
hex.Encode(dst[19:], src[8:10])
hex.Encode(dst[24:], src[10:16])
return dst, nil
}

22
vendor/github.com/robfig/cron/.gitignore generated vendored Normal file
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# Compiled Object files, Static and Dynamic libs (Shared Objects)
*.o
*.a
*.so
# Folders
_obj
_test
# Architecture specific extensions/prefixes
*.[568vq]
[568vq].out
*.cgo1.go
*.cgo2.c
_cgo_defun.c
_cgo_gotypes.go
_cgo_export.*
_testmain.go
*.exe

1
vendor/github.com/robfig/cron/.travis.yml generated vendored Normal file
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language: go

21
vendor/github.com/robfig/cron/LICENSE generated vendored Normal file
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Copyright (C) 2012 Rob Figueiredo
All Rights Reserved.
MIT LICENSE
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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vendor/github.com/robfig/cron/README.md generated vendored Normal file
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[![GoDoc](http://godoc.org/github.com/robfig/cron?status.png)](http://godoc.org/github.com/robfig/cron)
[![Build Status](https://travis-ci.org/robfig/cron.svg?branch=master)](https://travis-ci.org/robfig/cron)
# cron
Documentation here: https://godoc.org/github.com/robfig/cron

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vendor/github.com/robfig/cron/constantdelay.go generated vendored Normal file
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package cron
import "time"
// ConstantDelaySchedule represents a simple recurring duty cycle, e.g. "Every 5 minutes".
// It does not support jobs more frequent than once a second.
type ConstantDelaySchedule struct {
Delay time.Duration
}
// Every returns a crontab Schedule that activates once every duration.
// Delays of less than a second are not supported (will round up to 1 second).
// Any fields less than a Second are truncated.
func Every(duration time.Duration) ConstantDelaySchedule {
if duration < time.Second {
duration = time.Second
}
return ConstantDelaySchedule{
Delay: duration - time.Duration(duration.Nanoseconds())%time.Second,
}
}
// Next returns the next time this should be run.
// This rounds so that the next activation time will be on the second.
func (schedule ConstantDelaySchedule) Next(t time.Time) time.Time {
return t.Add(schedule.Delay - time.Duration(t.Nanosecond())*time.Nanosecond)
}

259
vendor/github.com/robfig/cron/cron.go generated vendored Normal file
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package cron
import (
"log"
"runtime"
"sort"
"time"
)
// Cron keeps track of any number of entries, invoking the associated func as
// specified by the schedule. It may be started, stopped, and the entries may
// be inspected while running.
type Cron struct {
entries []*Entry
stop chan struct{}
add chan *Entry
snapshot chan []*Entry
running bool
ErrorLog *log.Logger
location *time.Location
}
// Job is an interface for submitted cron jobs.
type Job interface {
Run()
}
// The Schedule describes a job's duty cycle.
type Schedule interface {
// Return the next activation time, later than the given time.
// Next is invoked initially, and then each time the job is run.
Next(time.Time) time.Time
}
// Entry consists of a schedule and the func to execute on that schedule.
type Entry struct {
// The schedule on which this job should be run.
Schedule Schedule
// The next time the job will run. This is the zero time if Cron has not been
// started or this entry's schedule is unsatisfiable
Next time.Time
// The last time this job was run. This is the zero time if the job has never
// been run.
Prev time.Time
// The Job to run.
Job Job
}
// byTime is a wrapper for sorting the entry array by time
// (with zero time at the end).
type byTime []*Entry
func (s byTime) Len() int { return len(s) }
func (s byTime) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
func (s byTime) Less(i, j int) bool {
// Two zero times should return false.
// Otherwise, zero is "greater" than any other time.
// (To sort it at the end of the list.)
if s[i].Next.IsZero() {
return false
}
if s[j].Next.IsZero() {
return true
}
return s[i].Next.Before(s[j].Next)
}
// New returns a new Cron job runner, in the Local time zone.
func New() *Cron {
return NewWithLocation(time.Now().Location())
}
// NewWithLocation returns a new Cron job runner.
func NewWithLocation(location *time.Location) *Cron {
return &Cron{
entries: nil,
add: make(chan *Entry),
stop: make(chan struct{}),
snapshot: make(chan []*Entry),
running: false,
ErrorLog: nil,
location: location,
}
}
// A wrapper that turns a func() into a cron.Job
type FuncJob func()
func (f FuncJob) Run() { f() }
// AddFunc adds a func to the Cron to be run on the given schedule.
func (c *Cron) AddFunc(spec string, cmd func()) error {
return c.AddJob(spec, FuncJob(cmd))
}
// AddJob adds a Job to the Cron to be run on the given schedule.
func (c *Cron) AddJob(spec string, cmd Job) error {
schedule, err := Parse(spec)
if err != nil {
return err
}
c.Schedule(schedule, cmd)
return nil
}
// Schedule adds a Job to the Cron to be run on the given schedule.
func (c *Cron) Schedule(schedule Schedule, cmd Job) {
entry := &Entry{
Schedule: schedule,
Job: cmd,
}
if !c.running {
c.entries = append(c.entries, entry)
return
}
c.add <- entry
}
// Entries returns a snapshot of the cron entries.
func (c *Cron) Entries() []*Entry {
if c.running {
c.snapshot <- nil
x := <-c.snapshot
return x
}
return c.entrySnapshot()
}
// Location gets the time zone location
func (c *Cron) Location() *time.Location {
return c.location
}
// Start the cron scheduler in its own go-routine, or no-op if already started.
func (c *Cron) Start() {
if c.running {
return
}
c.running = true
go c.run()
}
// Run the cron scheduler, or no-op if already running.
func (c *Cron) Run() {
if c.running {
return
}
c.running = true
c.run()
}
func (c *Cron) runWithRecovery(j Job) {
defer func() {
if r := recover(); r != nil {
const size = 64 << 10
buf := make([]byte, size)
buf = buf[:runtime.Stack(buf, false)]
c.logf("cron: panic running job: %v\n%s", r, buf)
}
}()
j.Run()
}
// Run the scheduler. this is private just due to the need to synchronize
// access to the 'running' state variable.
func (c *Cron) run() {
// Figure out the next activation times for each entry.
now := c.now()
for _, entry := range c.entries {
entry.Next = entry.Schedule.Next(now)
}
for {
// Determine the next entry to run.
sort.Sort(byTime(c.entries))
var timer *time.Timer
if len(c.entries) == 0 || c.entries[0].Next.IsZero() {
// If there are no entries yet, just sleep - it still handles new entries
// and stop requests.
timer = time.NewTimer(100000 * time.Hour)
} else {
timer = time.NewTimer(c.entries[0].Next.Sub(now))
}
for {
select {
case now = <-timer.C:
now = now.In(c.location)
// Run every entry whose next time was less than now
for _, e := range c.entries {
if e.Next.After(now) || e.Next.IsZero() {
break
}
go c.runWithRecovery(e.Job)
e.Prev = e.Next
e.Next = e.Schedule.Next(now)
}
case newEntry := <-c.add:
timer.Stop()
now = c.now()
newEntry.Next = newEntry.Schedule.Next(now)
c.entries = append(c.entries, newEntry)
case <-c.snapshot:
c.snapshot <- c.entrySnapshot()
continue
case <-c.stop:
timer.Stop()
return
}
break
}
}
}
// Logs an error to stderr or to the configured error log
func (c *Cron) logf(format string, args ...interface{}) {
if c.ErrorLog != nil {
c.ErrorLog.Printf(format, args...)
} else {
log.Printf(format, args...)
}
}
// Stop stops the cron scheduler if it is running; otherwise it does nothing.
func (c *Cron) Stop() {
if !c.running {
return
}
c.stop <- struct{}{}
c.running = false
}
// entrySnapshot returns a copy of the current cron entry list.
func (c *Cron) entrySnapshot() []*Entry {
entries := []*Entry{}
for _, e := range c.entries {
entries = append(entries, &Entry{
Schedule: e.Schedule,
Next: e.Next,
Prev: e.Prev,
Job: e.Job,
})
}
return entries
}
// now returns current time in c location
func (c *Cron) now() time.Time {
return time.Now().In(c.location)
}

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vendor/github.com/robfig/cron/doc.go generated vendored Normal file
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/*
Package cron implements a cron spec parser and job runner.
Usage
Callers may register Funcs to be invoked on a given schedule. Cron will run
them in their own goroutines.
c := cron.New()
c.AddFunc("0 30 * * * *", func() { fmt.Println("Every hour on the half hour") })
c.AddFunc("@hourly", func() { fmt.Println("Every hour") })
c.AddFunc("@every 1h30m", func() { fmt.Println("Every hour thirty") })
c.Start()
..
// Funcs are invoked in their own goroutine, asynchronously.
...
// Funcs may also be added to a running Cron
c.AddFunc("@daily", func() { fmt.Println("Every day") })
..
// Inspect the cron job entries' next and previous run times.
inspect(c.Entries())
..
c.Stop() // Stop the scheduler (does not stop any jobs already running).
CRON Expression Format
A cron expression represents a set of times, using 6 space-separated fields.
Field name | Mandatory? | Allowed values | Allowed special characters
---------- | ---------- | -------------- | --------------------------
Seconds | Yes | 0-59 | * / , -
Minutes | Yes | 0-59 | * / , -
Hours | Yes | 0-23 | * / , -
Day of month | Yes | 1-31 | * / , - ?
Month | Yes | 1-12 or JAN-DEC | * / , -
Day of week | Yes | 0-6 or SUN-SAT | * / , - ?
Note: Month and Day-of-week field values are case insensitive. "SUN", "Sun",
and "sun" are equally accepted.
Special Characters
Asterisk ( * )
The asterisk indicates that the cron expression will match for all values of the
field; e.g., using an asterisk in the 5th field (month) would indicate every
month.
Slash ( / )
Slashes are used to describe increments of ranges. For example 3-59/15 in the
1st field (minutes) would indicate the 3rd minute of the hour and every 15
minutes thereafter. The form "*\/..." is equivalent to the form "first-last/...",
that is, an increment over the largest possible range of the field. The form
"N/..." is accepted as meaning "N-MAX/...", that is, starting at N, use the
increment until the end of that specific range. It does not wrap around.
Comma ( , )
Commas are used to separate items of a list. For example, using "MON,WED,FRI" in
the 5th field (day of week) would mean Mondays, Wednesdays and Fridays.
Hyphen ( - )
Hyphens are used to define ranges. For example, 9-17 would indicate every
hour between 9am and 5pm inclusive.
Question mark ( ? )
Question mark may be used instead of '*' for leaving either day-of-month or
day-of-week blank.
Predefined schedules
You may use one of several pre-defined schedules in place of a cron expression.
Entry | Description | Equivalent To
----- | ----------- | -------------
@yearly (or @annually) | Run once a year, midnight, Jan. 1st | 0 0 0 1 1 *
@monthly | Run once a month, midnight, first of month | 0 0 0 1 * *
@weekly | Run once a week, midnight between Sat/Sun | 0 0 0 * * 0
@daily (or @midnight) | Run once a day, midnight | 0 0 0 * * *
@hourly | Run once an hour, beginning of hour | 0 0 * * * *
Intervals
You may also schedule a job to execute at fixed intervals, starting at the time it's added
or cron is run. This is supported by formatting the cron spec like this:
@every <duration>
where "duration" is a string accepted by time.ParseDuration
(http://golang.org/pkg/time/#ParseDuration).
For example, "@every 1h30m10s" would indicate a schedule that activates after
1 hour, 30 minutes, 10 seconds, and then every interval after that.
Note: The interval does not take the job runtime into account. For example,
if a job takes 3 minutes to run, and it is scheduled to run every 5 minutes,
it will have only 2 minutes of idle time between each run.
Time zones
All interpretation and scheduling is done in the machine's local time zone (as
provided by the Go time package (http://www.golang.org/pkg/time).
Be aware that jobs scheduled during daylight-savings leap-ahead transitions will
not be run!
Thread safety
Since the Cron service runs concurrently with the calling code, some amount of
care must be taken to ensure proper synchronization.
All cron methods are designed to be correctly synchronized as long as the caller
ensures that invocations have a clear happens-before ordering between them.
Implementation
Cron entries are stored in an array, sorted by their next activation time. Cron
sleeps until the next job is due to be run.
Upon waking:
- it runs each entry that is active on that second
- it calculates the next run times for the jobs that were run
- it re-sorts the array of entries by next activation time.
- it goes to sleep until the soonest job.
*/
package cron

380
vendor/github.com/robfig/cron/parser.go generated vendored Normal file
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@ -0,0 +1,380 @@
package cron
import (
"fmt"
"math"
"strconv"
"strings"
"time"
)
// Configuration options for creating a parser. Most options specify which
// fields should be included, while others enable features. If a field is not
// included the parser will assume a default value. These options do not change
// the order fields are parse in.
type ParseOption int
const (
Second ParseOption = 1 << iota // Seconds field, default 0
Minute // Minutes field, default 0
Hour // Hours field, default 0
Dom // Day of month field, default *
Month // Month field, default *
Dow // Day of week field, default *
DowOptional // Optional day of week field, default *
Descriptor // Allow descriptors such as @monthly, @weekly, etc.
)
var places = []ParseOption{
Second,
Minute,
Hour,
Dom,
Month,
Dow,
}
var defaults = []string{
"0",
"0",
"0",
"*",
"*",
"*",
}
// A custom Parser that can be configured.
type Parser struct {
options ParseOption
optionals int
}
// Creates a custom Parser with custom options.
//
// // Standard parser without descriptors
// specParser := NewParser(Minute | Hour | Dom | Month | Dow)
// sched, err := specParser.Parse("0 0 15 */3 *")
//
// // Same as above, just excludes time fields
// subsParser := NewParser(Dom | Month | Dow)
// sched, err := specParser.Parse("15 */3 *")
//
// // Same as above, just makes Dow optional
// subsParser := NewParser(Dom | Month | DowOptional)
// sched, err := specParser.Parse("15 */3")
//
func NewParser(options ParseOption) Parser {
optionals := 0
if options&DowOptional > 0 {
options |= Dow
optionals++
}
return Parser{options, optionals}
}
// Parse returns a new crontab schedule representing the given spec.
// It returns a descriptive error if the spec is not valid.
// It accepts crontab specs and features configured by NewParser.
func (p Parser) Parse(spec string) (Schedule, error) {
if len(spec) == 0 {
return nil, fmt.Errorf("Empty spec string")
}
if spec[0] == '@' && p.options&Descriptor > 0 {
return parseDescriptor(spec)
}
// Figure out how many fields we need
max := 0
for _, place := range places {
if p.options&place > 0 {
max++
}
}
min := max - p.optionals
// Split fields on whitespace
fields := strings.Fields(spec)
// Validate number of fields
if count := len(fields); count < min || count > max {
if min == max {
return nil, fmt.Errorf("Expected exactly %d fields, found %d: %s", min, count, spec)
}
return nil, fmt.Errorf("Expected %d to %d fields, found %d: %s", min, max, count, spec)
}
// Fill in missing fields
fields = expandFields(fields, p.options)
var err error
field := func(field string, r bounds) uint64 {
if err != nil {
return 0
}
var bits uint64
bits, err = getField(field, r)
return bits
}
var (
second = field(fields[0], seconds)
minute = field(fields[1], minutes)
hour = field(fields[2], hours)
dayofmonth = field(fields[3], dom)
month = field(fields[4], months)
dayofweek = field(fields[5], dow)
)
if err != nil {
return nil, err
}
return &SpecSchedule{
Second: second,
Minute: minute,
Hour: hour,
Dom: dayofmonth,
Month: month,
Dow: dayofweek,
}, nil
}
func expandFields(fields []string, options ParseOption) []string {
n := 0
count := len(fields)
expFields := make([]string, len(places))
copy(expFields, defaults)
for i, place := range places {
if options&place > 0 {
expFields[i] = fields[n]
n++
}
if n == count {
break
}
}
return expFields
}
var standardParser = NewParser(
Minute | Hour | Dom | Month | Dow | Descriptor,
)
// ParseStandard returns a new crontab schedule representing the given standardSpec
// (https://en.wikipedia.org/wiki/Cron). It differs from Parse requiring to always
// pass 5 entries representing: minute, hour, day of month, month and day of week,
// in that order. It returns a descriptive error if the spec is not valid.
//
// It accepts
// - Standard crontab specs, e.g. "* * * * ?"
// - Descriptors, e.g. "@midnight", "@every 1h30m"
func ParseStandard(standardSpec string) (Schedule, error) {
return standardParser.Parse(standardSpec)
}
var defaultParser = NewParser(
Second | Minute | Hour | Dom | Month | DowOptional | Descriptor,
)
// Parse returns a new crontab schedule representing the given spec.
// It returns a descriptive error if the spec is not valid.
//
// It accepts
// - Full crontab specs, e.g. "* * * * * ?"
// - Descriptors, e.g. "@midnight", "@every 1h30m"
func Parse(spec string) (Schedule, error) {
return defaultParser.Parse(spec)
}
// getField returns an Int with the bits set representing all of the times that
// the field represents or error parsing field value. A "field" is a comma-separated
// list of "ranges".
func getField(field string, r bounds) (uint64, error) {
var bits uint64
ranges := strings.FieldsFunc(field, func(r rune) bool { return r == ',' })
for _, expr := range ranges {
bit, err := getRange(expr, r)
if err != nil {
return bits, err
}
bits |= bit
}
return bits, nil
}
// getRange returns the bits indicated by the given expression:
// number | number "-" number [ "/" number ]
// or error parsing range.
func getRange(expr string, r bounds) (uint64, error) {
var (
start, end, step uint
rangeAndStep = strings.Split(expr, "/")
lowAndHigh = strings.Split(rangeAndStep[0], "-")
singleDigit = len(lowAndHigh) == 1
err error
)
var extra uint64
if lowAndHigh[0] == "*" || lowAndHigh[0] == "?" {
start = r.min
end = r.max
extra = starBit
} else {
start, err = parseIntOrName(lowAndHigh[0], r.names)
if err != nil {
return 0, err
}
switch len(lowAndHigh) {
case 1:
end = start
case 2:
end, err = parseIntOrName(lowAndHigh[1], r.names)
if err != nil {
return 0, err
}
default:
return 0, fmt.Errorf("Too many hyphens: %s", expr)
}
}
switch len(rangeAndStep) {
case 1:
step = 1
case 2:
step, err = mustParseInt(rangeAndStep[1])
if err != nil {
return 0, err
}
// Special handling: "N/step" means "N-max/step".
if singleDigit {
end = r.max
}
default:
return 0, fmt.Errorf("Too many slashes: %s", expr)
}
if start < r.min {
return 0, fmt.Errorf("Beginning of range (%d) below minimum (%d): %s", start, r.min, expr)
}
if end > r.max {
return 0, fmt.Errorf("End of range (%d) above maximum (%d): %s", end, r.max, expr)
}
if start > end {
return 0, fmt.Errorf("Beginning of range (%d) beyond end of range (%d): %s", start, end, expr)
}
if step == 0 {
return 0, fmt.Errorf("Step of range should be a positive number: %s", expr)
}
return getBits(start, end, step) | extra, nil
}
// parseIntOrName returns the (possibly-named) integer contained in expr.
func parseIntOrName(expr string, names map[string]uint) (uint, error) {
if names != nil {
if namedInt, ok := names[strings.ToLower(expr)]; ok {
return namedInt, nil
}
}
return mustParseInt(expr)
}
// mustParseInt parses the given expression as an int or returns an error.
func mustParseInt(expr string) (uint, error) {
num, err := strconv.Atoi(expr)
if err != nil {
return 0, fmt.Errorf("Failed to parse int from %s: %s", expr, err)
}
if num < 0 {
return 0, fmt.Errorf("Negative number (%d) not allowed: %s", num, expr)
}
return uint(num), nil
}
// getBits sets all bits in the range [min, max], modulo the given step size.
func getBits(min, max, step uint) uint64 {
var bits uint64
// If step is 1, use shifts.
if step == 1 {
return ^(math.MaxUint64 << (max + 1)) & (math.MaxUint64 << min)
}
// Else, use a simple loop.
for i := min; i <= max; i += step {
bits |= 1 << i
}
return bits
}
// all returns all bits within the given bounds. (plus the star bit)
func all(r bounds) uint64 {
return getBits(r.min, r.max, 1) | starBit
}
// parseDescriptor returns a predefined schedule for the expression, or error if none matches.
func parseDescriptor(descriptor string) (Schedule, error) {
switch descriptor {
case "@yearly", "@annually":
return &SpecSchedule{
Second: 1 << seconds.min,
Minute: 1 << minutes.min,
Hour: 1 << hours.min,
Dom: 1 << dom.min,
Month: 1 << months.min,
Dow: all(dow),
}, nil
case "@monthly":
return &SpecSchedule{
Second: 1 << seconds.min,
Minute: 1 << minutes.min,
Hour: 1 << hours.min,
Dom: 1 << dom.min,
Month: all(months),
Dow: all(dow),
}, nil
case "@weekly":
return &SpecSchedule{
Second: 1 << seconds.min,
Minute: 1 << minutes.min,
Hour: 1 << hours.min,
Dom: all(dom),
Month: all(months),
Dow: 1 << dow.min,
}, nil
case "@daily", "@midnight":
return &SpecSchedule{
Second: 1 << seconds.min,
Minute: 1 << minutes.min,
Hour: 1 << hours.min,
Dom: all(dom),
Month: all(months),
Dow: all(dow),
}, nil
case "@hourly":
return &SpecSchedule{
Second: 1 << seconds.min,
Minute: 1 << minutes.min,
Hour: all(hours),
Dom: all(dom),
Month: all(months),
Dow: all(dow),
}, nil
}
const every = "@every "
if strings.HasPrefix(descriptor, every) {
duration, err := time.ParseDuration(descriptor[len(every):])
if err != nil {
return nil, fmt.Errorf("Failed to parse duration %s: %s", descriptor, err)
}
return Every(duration), nil
}
return nil, fmt.Errorf("Unrecognized descriptor: %s", descriptor)
}

158
vendor/github.com/robfig/cron/spec.go generated vendored Normal file
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@ -0,0 +1,158 @@
package cron
import "time"
// SpecSchedule specifies a duty cycle (to the second granularity), based on a
// traditional crontab specification. It is computed initially and stored as bit sets.
type SpecSchedule struct {
Second, Minute, Hour, Dom, Month, Dow uint64
}
// bounds provides a range of acceptable values (plus a map of name to value).
type bounds struct {
min, max uint
names map[string]uint
}
// The bounds for each field.
var (
seconds = bounds{0, 59, nil}
minutes = bounds{0, 59, nil}
hours = bounds{0, 23, nil}
dom = bounds{1, 31, nil}
months = bounds{1, 12, map[string]uint{
"jan": 1,
"feb": 2,
"mar": 3,
"apr": 4,
"may": 5,
"jun": 6,
"jul": 7,
"aug": 8,
"sep": 9,
"oct": 10,
"nov": 11,
"dec": 12,
}}
dow = bounds{0, 6, map[string]uint{
"sun": 0,
"mon": 1,
"tue": 2,
"wed": 3,
"thu": 4,
"fri": 5,
"sat": 6,
}}
)
const (
// Set the top bit if a star was included in the expression.
starBit = 1 << 63
)
// Next returns the next time this schedule is activated, greater than the given
// time. If no time can be found to satisfy the schedule, return the zero time.
func (s *SpecSchedule) Next(t time.Time) time.Time {
// General approach:
// For Month, Day, Hour, Minute, Second:
// Check if the time value matches. If yes, continue to the next field.
// If the field doesn't match the schedule, then increment the field until it matches.
// While incrementing the field, a wrap-around brings it back to the beginning
// of the field list (since it is necessary to re-verify previous field
// values)
// Start at the earliest possible time (the upcoming second).
t = t.Add(1*time.Second - time.Duration(t.Nanosecond())*time.Nanosecond)
// This flag indicates whether a field has been incremented.
added := false
// If no time is found within five years, return zero.
yearLimit := t.Year() + 5
WRAP:
if t.Year() > yearLimit {
return time.Time{}
}
// Find the first applicable month.
// If it's this month, then do nothing.
for 1<<uint(t.Month())&s.Month == 0 {
// If we have to add a month, reset the other parts to 0.
if !added {
added = true
// Otherwise, set the date at the beginning (since the current time is irrelevant).
t = time.Date(t.Year(), t.Month(), 1, 0, 0, 0, 0, t.Location())
}
t = t.AddDate(0, 1, 0)
// Wrapped around.
if t.Month() == time.January {
goto WRAP
}
}
// Now get a day in that month.
for !dayMatches(s, t) {
if !added {
added = true
t = time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, t.Location())
}
t = t.AddDate(0, 0, 1)
if t.Day() == 1 {
goto WRAP
}
}
for 1<<uint(t.Hour())&s.Hour == 0 {
if !added {
added = true
t = time.Date(t.Year(), t.Month(), t.Day(), t.Hour(), 0, 0, 0, t.Location())
}
t = t.Add(1 * time.Hour)
if t.Hour() == 0 {
goto WRAP
}
}
for 1<<uint(t.Minute())&s.Minute == 0 {
if !added {
added = true
t = t.Truncate(time.Minute)
}
t = t.Add(1 * time.Minute)
if t.Minute() == 0 {
goto WRAP
}
}
for 1<<uint(t.Second())&s.Second == 0 {
if !added {
added = true
t = t.Truncate(time.Second)
}
t = t.Add(1 * time.Second)
if t.Second() == 0 {
goto WRAP
}
}
return t
}
// dayMatches returns true if the schedule's day-of-week and day-of-month
// restrictions are satisfied by the given time.
func dayMatches(s *SpecSchedule, t time.Time) bool {
var (
domMatch bool = 1<<uint(t.Day())&s.Dom > 0
dowMatch bool = 1<<uint(t.Weekday())&s.Dow > 0
)
if s.Dom&starBit > 0 || s.Dow&starBit > 0 {
return domMatch && dowMatch
}
return domMatch || dowMatch
}

10
vendor/modules.txt vendored
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@ -1,4 +1,4 @@
# git.trj.tw/golang/utils v0.0.0-20181219032659-b1a8bce04189 # git.trj.tw/golang/utils v0.0.0-20190116070516-b266ebeb2d82
git.trj.tw/golang/utils git.trj.tw/golang/utils
# github.com/gin-contrib/sse v0.0.0-20170109093832-22d885f9ecc7 # github.com/gin-contrib/sse v0.0.0-20170109093832-22d885f9ecc7
github.com/gin-contrib/sse github.com/gin-contrib/sse
@ -9,14 +9,22 @@ github.com/gin-gonic/gin/json
github.com/gin-gonic/gin/render github.com/gin-gonic/gin/render
# github.com/golang/protobuf v1.2.0 # github.com/golang/protobuf v1.2.0
github.com/golang/protobuf/proto github.com/golang/protobuf/proto
# github.com/jmoiron/sqlx v1.2.0
github.com/jmoiron/sqlx
github.com/jmoiron/sqlx/reflectx
# github.com/json-iterator/go v1.1.5 # github.com/json-iterator/go v1.1.5
github.com/json-iterator/go github.com/json-iterator/go
# github.com/lib/pq v1.0.0
github.com/lib/pq
github.com/lib/pq/oid
# github.com/mattn/go-isatty v0.0.4 # github.com/mattn/go-isatty v0.0.4
github.com/mattn/go-isatty github.com/mattn/go-isatty
# github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd # github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd
github.com/modern-go/concurrent github.com/modern-go/concurrent
# github.com/modern-go/reflect2 v1.0.1 # github.com/modern-go/reflect2 v1.0.1
github.com/modern-go/reflect2 github.com/modern-go/reflect2
# github.com/robfig/cron v0.0.0-20180505203441-b41be1df6967
github.com/robfig/cron
# github.com/ugorji/go/codec v0.0.0-20181209151446-772ced7fd4c2 # github.com/ugorji/go/codec v0.0.0-20181209151446-772ced7fd4c2
github.com/ugorji/go/codec github.com/ugorji/go/codec
# golang.org/x/sys v0.0.0-20181221143128-b4a75ba826a6 # golang.org/x/sys v0.0.0-20181221143128-b4a75ba826a6