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graceful-shutdown.go
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/
graceful-shutdown.go
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// +build go1.8
package main
import (
"context"
"fmt"
"net/http"
"os"
"os/signal"
"syscall"
"time"
"github.com/wangyysde/sysadmLog"
"github.com/wangyysde/sysadmServer"
)
func main() {
router := sysadmServer.Default()
router.GET("/", func(c *sysadmServer.Context) {
time.Sleep(5 * time.Second)
c.String(http.StatusOK, "Welcome sysadmServer")
})
srv := &http.Server{
Addr: ":8080",
Handler: router,
}
// Initializing the server in a goroutine so that
// it won't block the graceful shutdown handling below
go func() {
if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
sysadmLog.Log(fmt.Sprintf("listen: %s\n", err),"fatal")
}
}()
// Wait for interrupt signal to gracefully shutdown the server with
// a timeout of 5 seconds.
quit := make(chan os.Signal, 1)
// kill (no param) default send syscall.SIGTERM
// kill -2 is syscall.SIGINT
// kill -9 is syscall.SIGKILL but can't be catch, so don't need add it
signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
<-quit
sysadmLog.Log("Shutting down server...","info")
// The context is used to inform the server it has 5 seconds to finish
// the request it is currently handling
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
if err := srv.Shutdown(ctx); err != nil {
sysadmLog.Log(fmt.Sprintf("Server forced to shutdown:%s",err),"fatal")
}
sysadmLog.Log("Server exiting")
}