if err != nil {
						panic(err)
					}

					var eventId = envelope.GetEventType().String()

					switch envelope.GetEventType() {
					case events.Envelope_HttpStart:
						eventId += envelope.GetHttpStart().GetPeerType().String()
					case events.Envelope_HttpStop:
						eventId += envelope.GetHttpStop().GetPeerType().String()
					case events.Envelope_Heartbeat:
					case events.Envelope_ValueMetric:
						eventId += envelope.GetValueMetric().GetName()
					case events.Envelope_CounterEvent:
						eventId += envelope.GetCounterEvent().GetName()
					default:
						panic("Unexpected message type")

					}

					if envelope.GetOrigin() != origin {
						panic("origin not as expected")
					}

					func() {
						lock.Lock()
						defer lock.Unlock()
						receivedEvents[eventId] = true
					}()
				}
					var eventId = envelope.GetEventType().String()

					tracker := eventTracker{eventType: eventId}

					switch envelope.GetEventType() {
					case events.Envelope_HttpStart:
						tracker.name = envelope.GetHttpStart().GetPeerType().String()
					case events.Envelope_HttpStop:
						tracker.name = envelope.GetHttpStop().GetPeerType().String()
					case events.Envelope_Heartbeat:
						tracker.name = envelope.GetHeartbeat().GetControlMessageIdentifier().String()
					case events.Envelope_ValueMetric:
						tracker.name = envelope.GetValueMetric().GetName()
					case events.Envelope_CounterEvent:
						tracker.name = envelope.GetCounterEvent().GetName()
					default:
						panic("Unexpected message type")

					}

					if envelope.GetOrigin() != strings.Join(origin, "/") {
						panic("origin not as expected")
					}

					func() {
						lock.Lock()
						defer lock.Unlock()
						receivedEvents = append(receivedEvents, tracker)
					}()
				}