golang API开发过程的中的自动重启方式(基于gin框架)

 func setupWatcher() (chan struct{}, error) {
  file, err := osext.Executable()
   if err != nil {
   return nil, err
   }
  log.Printf("watching %q\n", file)
   w, err := fsnotify.NewWatcher()
   if err != nil {
   return nil, err
  }
  done := make(chan struct{})
  go func() {
   select {
   case e := <-w.Events:
    log.Printf("watcher received: %+v", e)
    err := syscall.Exec(file, os.Args, os.Environ())
    if err != nil {
     log.Fatal(err)
    }
   case err := <-w.Errors:
    log.Printf("watcher error: %+v", err)
   case <-done:
    log.Print("watcher shutting down")
    return
   }
  }()
  err = w.Add(file)
  if err != nil {
   return nil, err
  }
  return done, nil
 }

if c.Bool("prod") {
   gin.SetMode(gin.ReleaseMode)
   // start route
   return routes.Routes(cnf.Server.Port)
  } else {
   gin.SetMode(gin.DebugMode)
   watcher, err := setupWatcher()
   if err != nil {
    // do something sensible
   log.Fatal(err)
  }
  defer close(watcher)
  return routes.Routes(cnf.Server.Port)
 }

package main
  
  import (
  "fmt"
  "log"
  "os"
  "syscall"
  "time"
  
  "github.com/fsnotify/fsnotify"
  "github.com/kardianos/osext"
 )
 
 func syscallExec() {
  watcher, err := setupWatcher()
  if err != nil {
   log.Fatal(err)
  }
  defer finally(watcher)
 
  fmt.Printf("current pid: %d\n", os.Getpid())
  var count = 0
 
  go func(count int) {
   for {
    fmt.Printf("> count in GO ROUTINE: %d\n", count)
    count++
    time.Sleep(1 * time.Second)
   }
  }(count)
 
  for {
   fmt.Printf("> count in MAIN: %d\n", count)
   count++
   time.Sleep(1 * time.Second)
  }
 }
 
 func finally(watcher chan struct{}) {
  // 重启时没有执行此函数
  fmt.Println("exit original exec")
  close(watcher)
 }
 
 func setupWatcher() (chan struct{}, error) {
  file, err := osext.Executable()
  if err != nil {
   return nil, err
  }
  log.Printf("watching %q\n", file)
  w, err := fsnotify.NewWatcher()
  if err != nil {
   return nil, err
  }
  done := make(chan struct{})
  go func() {
   select {
   case e := <-w.Events:
    log.Printf("watcher received: %v", e)
    err := syscall.Exec(file, os.Args, os.Environ())
    if err != nil {
     log.Fatal(err)
    }
   case err := <-w.Errors:
    log.Printf("watcher error: %+v", err)
   case <-done:
    log.Print("watcher shutting down")
    return
   }
  }()
  err = w.Add(file)
  if err != nil {
   return nil, err
  }
  return done, nil
 }