Fix status code when server timeout (#14)

* Fix status code when server timeout

Signed-off-by: taniwa <taniwa@yahoo-corp.jp>

* fix response body

Signed-off-by: taniwa <taniwa@yahoo-corp.jp>

fix

---------

Signed-off-by: taniwa <taniwa@yahoo-corp.jp>

router/router.go

@@ -30,7 +30,7 @@ import (
 	"github.com/kpango/glg"
 )
 
-//New returns Routed ServeMux
+// New returns Routed ServeMux
 func New(cfg config.Config, h handler.Handler) *http.ServeMux {
 
 	http.DefaultTransport.(*http.Transport).MaxIdleConnsPerHost = 32
@@ -76,6 +76,10 @@ func routing(m []string, t time.Duration, h handler.Func) http.Handler {
 						}
 						return
 					case <-ctx.Done():
+						http.Error(w,
+							fmt.Sprintf("Error: Handler Time Out by server.timeout\t%s",
+								http.StatusText(http.StatusServiceUnavailable)),
+							http.StatusServiceUnavailable)
 						glg.Errorf("Handler Time Out: %v", time.Since(start))
 						return
 					}

router/router_test.go

@@ -5,7 +5,7 @@ Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
 
-    http://www.apache.org/licenses/LICENSE-2.0
+	http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
@@ -383,6 +383,45 @@ func Test_routing(t *testing.T) {
 				},
 			}
 		}(),
+		func() test {
+			testStr := "test string"
+			want := 503
+
+			timeoutSec := time.Second * 1
+			waitSec := time.Second * 10
+
+			return test{
+				name: "Check status code is 503 when timeout",
+				args: args{
+					m: []string{
+						http.MethodGet,
+					},
+					t: timeoutSec,
+					h: func(rw http.ResponseWriter, r *http.Request) error {
+						time.Sleep(waitSec)
+						_, err := rw.Write([]byte(testStr))
+						return err
+					},
+				},
+				checkFunc: func(server http.Handler) error {
+					request := httptest.NewRequest(http.MethodGet, "/", nil)
+					record := httptest.NewRecorder()
+					server.ServeHTTP(record, request)
+					response := record.Result()
+
+					defer response.Body.Close()
+					fmt.Println("response.StatusCode: ", response.StatusCode)
+
+					// check status code
+					got := response.StatusCode
+					if got != want {
+						return fmt.Errorf("Status code is invalid: request: %v  got: %v  want: %v", request, got, want)
+					}
+
+					return nil
+				},
+			}
+		}(),
 		func() test {
 			timeoutSec := time.Second * 1
 			want := io.ErrClosedPipe