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golang graceful server shutdown example
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package main | |
import ( | |
"context" | |
"flag" | |
"fmt" | |
"log" | |
"net/http" | |
"os" | |
"os/signal" | |
"time" | |
) | |
const ( | |
service = "fooapi" | |
) | |
var ( | |
port = flag.Int("port", 3333, "http port to listen on") | |
shutdownTimeout = flag.Duration("shutdown-timeout", 10*time.Second, | |
"shutdown timeout (5s,5m,5h) before connections are cancelled") | |
) | |
func main() { | |
flag.Parse() | |
mux := http.NewServeMux() | |
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { | |
w.WriteHeader(200) | |
}) | |
srv := &http.Server{ | |
Addr: fmt.Sprintf(":%d", *port), | |
Handler: mux, | |
} | |
stop := make(chan os.Signal) | |
signal.Notify(stop, os.Interrupt) | |
go func() { | |
log.Printf("%s listening on 0.0.0.0:%d with %v timeout", service, *port, *shutdownTimeout) | |
if err := srv.ListenAndServe(); err != nil { | |
if err != http.ErrServerClosed { | |
log.Fatal(err) | |
} | |
} | |
}() | |
<-stop | |
log.Printf("%s shutting down ...\n", service) | |
ctx, cancel := context.WithTimeout(context.Background(), *shutdownTimeout) | |
defer cancel() | |
if err := srv.Shutdown(ctx); err != nil { | |
log.Fatal(err) | |
} | |
log.Printf("%s down\n", service) | |
} |
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