more informative broker error messages (close #26)

client/rendezvous.go

@@ -69,13 +69,21 @@ func (bc *BrokerChannel) Negotiate(offer *webrtc.SessionDescription) (
 	}
 	defer resp.Body.Close()
 	log.Printf("BrokerChannel Response:\n%s\n\n", resp.Status)
-	if http.StatusOK != resp.StatusCode {
-		return nil, errors.New("no answer from broker.")
-	}
+
+	switch resp.StatusCode {
+	case http.StatusOK:
 		body, err := ioutil.ReadAll(resp.Body)
 		if nil != err {
 			return nil, err
 		}
 		answer := webrtc.DeserializeSessionDescription(string(body))
 		return answer, nil
+
+	case http.StatusServiceUnavailable:
+		return nil, errors.New("No snowflake proxies currently available.")
+	case http.StatusBadRequest:
+		return nil, errors.New("You sent an invalid offer in the request.")
+	default:
+		return nil, errors.New("Unexpected error, no answer.")
+	}
 }

client/webrtc.go

@@ -237,7 +237,7 @@ func (c *webRTCConn) sendOfferToBroker() {
 		"\nFront URL:  ", frontDomain)
 	answer, err := c.broker.Negotiate(offer)
 	if nil != err || nil == answer {
-		log.Printf("BrokerChannel error: %s", err)
+		log.Printf("BrokerChannel Error: %s", err)
 		answer = nil
 	}
 	c.answerChannel <- answer