Graceful Shutdown inn Golang - amazon-web-services

Question

I am trying to add Graceful shut down in one of my server.
I know the code is working.
I was hoping that after redeployment of the server, first the graceful shutdown work and then the server would restart .
But it is not happening.
Can you all tell me the possibile reason's.
done := make(chan bool, 1)
quit := make(chan os.Signal, 1)
signal.Notify(quit, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
signal.Notify(quit, syscall.SIGHUP, syscall.SIGQUIT)
signal.Notify(quit, syscall.SIGILL, syscall.SIGTRAP)
signal.Notify(quit, syscall.SIGABRT, syscall.SIGBUS, syscall.SIGFPE)
go func() {
BootUpLog("before <-quit")
syscall.Kill(syscall.Getpid(), syscall.SIGTERM)
<-quit
BootUpLog("shutting down")
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
server.SetKeepAlivesEnabled(false)
if err := server.Shutdown(ctx); err != nil {
BootUpLog(fmt.Sprintf("Error in graceful shutdown of the server: %v", err))
}
close(done)
}()
if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
BootUpLog(fmt.Sprintf("shut down with error: %v", err))
}
<-done
BootUpLog("Shutdown gracefully.")
}
Here the log "before <-quit" is printing .
And after redeploymet it is not receiving any signal in the <-quit channel.

Answer 1

Could there be a problem with your BootUpLog() implementation? The following works for me (main.go):
package main
import (
"context"
"fmt"
"html"
"net/http"
"os"
"os/signal"
"syscall"
)
func main() {
fmt.Println("starting up")
quit := make(chan os.Signal, 1)
signal.Notify(quit, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
signal.Notify(quit, syscall.SIGHUP, syscall.SIGQUIT)
signal.Notify(quit, syscall.SIGILL, syscall.SIGTRAP)
signal.Notify(quit, syscall.SIGABRT, syscall.SIGBUS, syscall.SIGFPE)
server := &http.Server{
Addr: ":8080",
}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Hello, %q", html.EscapeString(r.URL.Path))
})
down := make(chan struct{})
go func() {
defer close(down)
err := server.ListenAndServe()
fmt.Println("shutting down: ", err)
}()
go func() {
fmt.Println("before <- quit")
syscall.Kill(syscall.Getpid(), syscall.SIGTERM)
fmt.Println("after signal sent")
<-quit
fmt.Println("after signal received")
server.Shutdown(context.Background())
}()
<-down
}
Running it:
$ go run main.go
starting up
before <- quit
after signal sent
after signal received
shutting down: http: Server closed