149 lines
2.5 KiB
Go
149 lines
2.5 KiB
Go
package main
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import (
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"context"
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"deploy/pkg/config"
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"deploy/pkg/logger"
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"deploy/pkg/server"
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"deploy/pkg/tools"
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"flag"
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"fmt"
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"log"
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"net/http"
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"os"
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"os/signal"
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"syscall"
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"time"
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"github.com/sirupsen/logrus"
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"gopkg.in/fsnotify.v1"
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)
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var cfgPath string = "./config.yml"
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func main() {
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flag.StringVar(&cfgPath, "c", "./config.yml", "config yaml path")
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flag.Parse()
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if !tools.CheckExists(cfgPath, false) {
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log.Fatal(fmt.Errorf("config file not exists"))
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}
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// lock for service running
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// buffer count 5
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reloadChan := make(chan struct{}, 5)
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// lock for main lock
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lock := make(chan os.Signal, 1)
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signal.Notify(lock, syscall.SIGTERM, syscall.SIGINT, syscall.SIGKILL)
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watcher, err := fsnotify.NewWatcher()
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if err != nil {
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log.Fatal(err)
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}
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defer watcher.Close()
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go func() {
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for {
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select {
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case event, ok := <-watcher.Events:
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if !ok {
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// channel closed
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return
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}
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if event.Op&fsnotify.Write == fsnotify.Write {
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// send reload channel
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reloadChan <- struct{}{}
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}
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case err, ok := <-watcher.Errors:
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if !ok {
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// channel closed
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return
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}
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log.Fatal(err)
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}
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}
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}()
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if err := watcher.Add(cfgPath); err != nil {
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log.Fatal(err)
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}
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go runService(reloadChan)
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<-lock
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close(reloadChan)
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}
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func runService(reload <-chan struct{}) {
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lastReload := time.Now()
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log := logger.NewLogger(nil)
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var svc *http.Server
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// infinity loop
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for {
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if svc == nil {
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svc = startServer(log)
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}
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select {
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case _, ok := <-reload:
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if !ok {
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// channel closed exit program
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if err := stopServer(svc); err != nil {
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log.Fatal(err)
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return
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}
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}
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if time.Since(lastReload).Seconds() < float64(2*time.Second) {
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break
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}
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lastReload = time.Now()
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if err := stopServer(svc); err != nil {
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log.Fatal(err)
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}
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svc = nil
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}
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}
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}
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func startServer(log *logrus.Logger) *http.Server {
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cfg, err := config.Load(cfgPath)
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if err != nil {
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log.Fatal(err)
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}
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engine := server.NewServer(log)
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// set routes
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if err := engine.SetRoutes(cfg.Listens); err != nil {
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log.Fatal(err)
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}
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svc := &http.Server{
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Addr: fmt.Sprintf(":%d", cfg.Server.Port),
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Handler: engine.Engine,
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}
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go func() {
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if err := svc.ListenAndServe(); err != nil && err != http.ErrServerClosed {
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log.Fatal(err)
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}
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}()
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return svc
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}
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func stopServer(svc *http.Server) error {
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ctx, cancel := context.WithTimeout(context.Background(), time.Second*1)
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defer cancel()
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if err := svc.Shutdown(ctx); err != nil {
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return err
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}
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return nil
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}
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