Пример #1
0
func TestHTTPClusterClientDoDeadlineExceedContext(t *testing.T) {
	fakeURL := url.URL{}
	tr := newFakeTransport()
	tr.finishCancel <- struct{}{}
	c := &httpClusterClient{
		clientFactory: newHTTPClientFactory(tr, DefaultCheckRedirect, 0),
		endpoints:     []url.URL{fakeURL},
	}

	errc := make(chan error)
	go func() {
		ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond)
		defer cancel()
		_, _, err := c.Do(ctx, &fakeAction{})
		errc <- err
	}()

	select {
	case err := <-errc:
		if err != context.DeadlineExceeded {
			t.Errorf("err = %+v, want %+v", err, context.DeadlineExceeded)
		}
	case <-time.After(time.Second):
		t.Fatalf("unexpected timeout when waitting for request to deadline exceed")
	}
}
Пример #2
0
func ExampleWithTimeout() {
	// Pass a context with a timeout to tell a blocking function that it
	// should abandon its work after the timeout elapses.
	ctx, _ := context.WithTimeout(context.Background(), 100*time.Millisecond)
	select {
	case <-time.After(200 * time.Millisecond):
		fmt.Println("overslept")
	case <-ctx.Done():
		fmt.Println(ctx.Err()) // prints "context deadline exceeded"
	}
	// Output:
	// context deadline exceeded
}
Пример #3
0
func (c *simpleHTTPClient) Do(ctx context.Context, act httpAction) (*http.Response, []byte, error) {
	req := act.HTTPRequest(c.endpoint)

	if err := printcURL(req); err != nil {
		return nil, nil, err
	}

	hctx, hcancel := context.WithCancel(ctx)
	if c.headerTimeout > 0 {
		hctx, hcancel = context.WithTimeout(ctx, c.headerTimeout)
	}
	defer hcancel()

	reqcancel := requestCanceler(c.transport, req)

	rtchan := make(chan roundTripResponse, 1)
	go func() {
		resp, err := c.transport.RoundTrip(req)
		rtchan <- roundTripResponse{resp: resp, err: err}
		close(rtchan)
	}()

	var resp *http.Response
	var err error

	select {
	case rtresp := <-rtchan:
		resp, err = rtresp.resp, rtresp.err
	case <-hctx.Done():
		// cancel and wait for request to actually exit before continuing
		reqcancel()
		rtresp := <-rtchan
		resp = rtresp.resp
		switch {
		case ctx.Err() != nil:
			err = ctx.Err()
		case hctx.Err() != nil:
			err = fmt.Errorf("client: endpoint %s exceeded header timeout", c.endpoint.String())
		default:
			panic("failed to get error from context")
		}
	}

	// always check for resp nil-ness to deal with possible
	// race conditions between channels above
	defer func() {
		if resp != nil {
			resp.Body.Close()
		}
	}()

	if err != nil {
		return nil, nil, err
	}

	var body []byte
	done := make(chan struct{})
	go func() {
		body, err = ioutil.ReadAll(resp.Body)
		done <- struct{}{}
	}()

	select {
	case <-ctx.Done():
		resp.Body.Close()
		<-done
		return nil, nil, ctx.Err()
	case <-done:
	}

	return resp, body, err
}