Example #1
0
func (l Logger) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
	for _, rule := range l.Rules {
		if httpserver.Path(r.URL.Path).Matches(rule.PathScope) {
			// Record the response
			responseRecorder := httpserver.NewResponseRecorder(w)

			// Attach the Replacer we'll use so that other middlewares can
			// set their own placeholders if they want to.
			rep := httpserver.NewReplacer(r, responseRecorder, CommonLogEmptyValue)
			responseRecorder.Replacer = rep

			// Bon voyage, request!
			status, err := l.Next.ServeHTTP(responseRecorder, r)

			if status >= 400 {
				// There was an error up the chain, but no response has been written yet.
				// The error must be handled here so the log entry will record the response size.
				if l.ErrorFunc != nil {
					l.ErrorFunc(responseRecorder, r, status)
				} else {
					// Default failover error handler
					responseRecorder.WriteHeader(status)
					fmt.Fprintf(responseRecorder, "%d %s", status, http.StatusText(status))
				}
				status = 0
			}

			// Write log entry
			rule.Log.Println(rep.Replace(rule.Format))

			return status, err
		}
	}
	return l.Next.ServeHTTP(w, r)
}
Example #2
0
func TestReverseProxy(t *testing.T) {
	log.SetOutput(ioutil.Discard)
	defer log.SetOutput(os.Stderr)

	var requestReceived bool
	backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		requestReceived = true
		w.Write([]byte("Hello, client"))
	}))
	defer backend.Close()

	// set up proxy
	p := &Proxy{
		Next:      httpserver.EmptyNext, // prevents panic in some cases when test fails
		Upstreams: []Upstream{newFakeUpstream(backend.URL, false)},
	}

	// create request and response recorder
	r, err := http.NewRequest("GET", "/", nil)
	if err != nil {
		t.Fatalf("Failed to create request: %v", err)
	}
	w := httptest.NewRecorder()

	p.ServeHTTP(w, r)

	if !requestReceived {
		t.Error("Expected backend to receive request, but it didn't")
	}

	// Make sure {upstream} placeholder is set
	rr := httpserver.NewResponseRecorder(httptest.NewRecorder())
	rr.Replacer = httpserver.NewReplacer(r, rr, "-")

	p.ServeHTTP(rr, r)

	if got, want := rr.Replacer.Replace("{upstream}"), backend.URL; got != want {
		t.Errorf("Expected custom placeholder {upstream} to be set (%s), but it wasn't; got: %s", want, got)
	}
}