Exemple #1
0
// Watch attempts to begin watching the requested location.
// Returns a watch.Interface, or an error.
func (r *Request) Watch() (watch.Interface, error) {
	if r.err != nil {
		return nil, r.err
	}
	url := r.URL().String()
	req, err := http.NewRequest(r.verb, url, r.body)
	if err != nil {
		return nil, err
	}
	client := r.client
	if client == nil {
		client = http.DefaultClient
	}
	resp, err := client.Do(req)
	if err != nil {
		// The watch stream mechanism handles many common partial data errors, so closed
		// connections can be retried in many cases.
		if util.IsProbableEOF(err) {
			return watch.NewEmptyWatch(), nil
		}
		return nil, err
	}
	if resp.StatusCode != http.StatusOK {
		if result := r.transformResponse(resp, req); result.err != nil {
			return nil, result.err
		}
		return nil, fmt.Errorf("for request '%+v', got status: %v", url, resp.StatusCode)
	}
	return watch.NewStreamWatcher(watchjson.NewDecoder(resp.Body, r.codec)), nil
}
// receive reads result from the decoder in a loop and sends down the result channel.
func (sw *StreamWatcher) receive() {
	defer close(sw.result)
	defer sw.Stop()
	defer util.HandleCrash()
	for {
		action, obj, err := sw.source.Decode()
		if err != nil {
			// Ignore expected error.
			if sw.stopping() {
				return
			}
			switch err {
			case io.EOF:
				// watch closed normally
			case io.ErrUnexpectedEOF:
				glog.V(1).Infof("Unexpected EOF during watch stream event decoding: %v", err)
			default:
				msg := "Unable to decode an event from the watch stream: %v"
				if util.IsProbableEOF(err) {
					glog.V(5).Infof(msg, err)
				} else {
					glog.Errorf(msg, err)
				}
			}
			return
		}
		sw.result <- Event{
			Type:   action,
			Object: obj,
		}
	}
}