/
week03.go
79 lines (70 loc) · 1.9 KB
/
week03.go
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package main
import (
"context"
"fmt"
"github.com/pkg/errors"
"golang.org/x/sync/errgroup"
"log"
"net/http"
"os"
"os/signal"
"syscall"
)
// 1. 基于 errgroup 实现一个 http server 的启动和关闭 ,
// 以及 linux signal 信号的注册和处理,要保证能够一个退出,全部注销退出。
func ServeApp(ctx context.Context) error {
mux := http.NewServeMux()
mux.HandleFunc("/", func(resp http.ResponseWriter, req *http.Request) {
fmt.Fprintln(resp, "hello, gopher")
})
addr := "0.0.0.0:8080"
return serve(ctx, addr, mux)
}
func serveDebug(ctx context.Context) error {
addr := "127.0.0.1:8001"
return serve(ctx, addr, http.DefaultServeMux)
}
func serve(ctx context.Context, addr string, handler http.Handler) error {
s := http.Server{
Addr: addr,
Handler: handler,
}
go func() {
<-ctx.Done()
s.Shutdown(context.Background())
log.Println(fmt.Sprintf("shutdown server: %s", addr))
}()
log.Printf("start server: %s", addr)
return s.ListenAndServe()
}
func signalListener(ctx context.Context, ) error {
notifyCh :=make(chan os.Signal, 1)
signal.Notify(notifyCh, syscall.SIGINT, syscall.SIGTERM)
log.Println("awaiting signal")
sign := <- notifyCh
log.Printf("receive signal: %s", sign)
return errors.New("process killed")
}
func main() {
g, ctx := errgroup.WithContext(context.Background())
g.Go(func() error {
return serveDebug(ctx)
})
g.Go(func() error {
return ServeApp(ctx)
})
g.Go(func() error {
return signalListener(ctx)
})
if err := g.Wait(); err != nil {
log.Println("server error")
}
}
// output below
// 2021/09/19 19:41:39 start server: 127.0.0.1:8001
// 2021/09/19 19:41:39 start server: 0.0.0.0:8080
// 2021/09/19 19:41:39 awaiting signal
// 2021/09/19 19:41:42 receive signal: interrupt
// 2021/09/19 19:41:42 shutdown server: 0.0.0.0:8080
// 2021/09/19 19:41:42 shutdown server: 127.0.0.1:8001
// 2021/09/19 19:41:42 server error