1. package main
    3. import (
    4.     "context"
    5.     "log"
    6.     "net/http"
    7.     "os"
    8.     "os/signal"
    9.     "syscall"
    10.     "time"
    12.     "github.com/gin-gonic/gin"
    13. )
    15. func main() {
    16.     router := gin.Default()
    17.     router.GET("/", func(c *gin.Context) {
    18.         time.Sleep(5 * time.Second)
    19.         c.String(http.StatusOK, "Welcome Gin Server")
    20.     })
    22.     srv := &http.Server{
    23.         Addr:    ":8080",
    24.         Handler: router,
    25.     }
    27.     go func() {
    28.         // service connections
    29.         if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
    30.             log.Fatalf("listen: %s\n", err)
    31.         }
    32.     }()
    34.     // Wait for interrupt signal to gracefully shutdown the server with
    35.     // a timeout of 5 seconds.
    36.     quit := make(chan os.Signal)
    37.     // kill (no param) default send syscanll.SIGTERM
    38.     // kill -2 is syscall.SIGINT
    39.     // kill -9 is syscall. SIGKILL but can"t be catch, so don't need add it
    40.     signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
    41.     <-quit
    42.     log.Println("Shutdown Server ...")
    44.     ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
    45.     defer cancel()
    46.     if err := srv.Shutdown(ctx); err != nil {
    47.         log.Fatal("Server Shutdown:", err)
    48.     }
    49.     // catching ctx.Done(). timeout of 5 seconds.
    50.     select {
    51.     case <-ctx.Done():
    52.         log.Println("timeout of 5 seconds.")
    53.     }
    54.     log.Println("Server exiting")
    55. }