logs: removed all log.Errors unhelpful to users

Let's save log.Error for things the user can take action on.
Moved all our diagnostics to log.Debug. We can ideally reduce them
even further.

net/swarm/swarm_listen.go

@@ -33,7 +33,7 @@ func (s *Swarm) listen(addrs []ma.Multiaddr) error {
 				retErr.Errors = make([]error, len(addrs))
 			}
 			retErr.Errors[i] = err
-			log.Errorf("Failed to listen on: %s - %s", addr, err)
+			log.Debugf("Failed to listen on: %s - %s", addr, err)
 		}
 	}
 
@@ -122,7 +122,7 @@ func (s *Swarm) connHandler(c *ps.Conn) *Conn {
 
 	sc, err := s.newConnSetup(ctx, c)
 	if err != nil {
-		log.Error(err)
+		log.Debug(err)
 		log.Event(ctx, "newConnHandlerDisconnect", lgbl.NetConn(c.NetConn()), lgbl.Error(err))
 		c.Close() // boom. close it.
 		return nil

net/swarm/swarm_test.go

@@ -22,25 +22,25 @@ func EchoStreamHandler(stream inet.Stream) {
 
 		// pull out the ipfs conn
 		c := stream.Conn()
-		log.Debugf("%s ponging to %s", c.LocalPeer(), c.RemotePeer())
+		log.Infof("%s ponging to %s", c.LocalPeer(), c.RemotePeer())
 
 		buf := make([]byte, 4)
 
 		for {
 			if _, err := stream.Read(buf); err != nil {
 				if err != io.EOF {
-					log.Error("ping receive error:", err)
+					log.Info("ping receive error:", err)
 				}
 				return
 			}
 
 			if !bytes.Equal(buf, []byte("ping")) {
-				log.Errorf("ping receive error: ping != %s %v", buf, buf)
+				log.Infof("ping receive error: ping != %s %v", buf, buf)
 				return
 			}
 
 			if _, err := stream.Write([]byte("pong")); err != nil {
-				log.Error("pond send error:", err)
+				log.Info("pond send error:", err)
 				return
 			}
 		}

protocol/mux.go

@@ -24,7 +24,6 @@ type streamHandlerMap map[ID]inet.StreamHandler
 // It contains the handlers for each protocol accepted.
 // It dispatches handlers for streams opened by remote peers.
 type Mux struct {
-
 	lock           sync.RWMutex
 	handlers       streamHandlerMap
 	defaultHandler inet.StreamHandler
@@ -50,13 +49,11 @@ func (m *Mux) Protocols() []ID {
 // readHeader reads the stream and returns the next Handler function
 // according to the muxer encoding.
 func (m *Mux) readHeader(s io.Reader) (ID, inet.StreamHandler, error) {
-	// log.Error("ReadProtocolHeader")
 	p, err := ReadHeader(s)
 	if err != nil {
 		return "", nil, err
 	}
 
-	// log.Debug("readHeader got:", p)
 	m.lock.RLock()
 	defer m.lock.RUnlock()
 	h, found := m.handlers[p]

test/backpressure/backpressure_test.go

@@ -66,9 +66,9 @@ a problem.
 			// our request handler. can do stuff here. we
 			// simulate something taking time by waiting
 			// on requestHandled
-			log.Error("request worker handling...")
+			log.Debug("request worker handling...")
 			<-requestHandled
-			log.Error("request worker done!")
+			log.Debug("request worker done!")
 			receiverRatelimit <- struct{}{} // release
 		}()
 	}