Enable errcheck linter (#646)

.golangci.yaml

@@ -175,7 +175,6 @@ linters-settings:
 linters:
   enable-all: true
   disable:
-    - errcheck
     - gochecknoglobals
     - gocyclo
     - lll

bridge/slack/slack.go

@@ -195,16 +195,16 @@ func (b *Bslack) Send(msg config.Message) (string, error) {
 
 	// Use webhook to send the message
 	if b.GetString(outgoingWebhookConfig) != "" {
-		return b.sendWebhook(msg)
+		return "", b.sendWebhook(msg)
 	}
 	return b.sendRTM(msg)
 }
 
 // sendWebhook uses the configured WebhookURL to send the message
-func (b *Bslack) sendWebhook(msg config.Message) (string, error) {
+func (b *Bslack) sendWebhook(msg config.Message) error {
 	// Skip events.
 	if msg.Event != "" {
-		return "", nil
+		return nil
 	}
 
 	if b.GetBool(useNickPrefixConfig) {
@@ -259,9 +259,9 @@ func (b *Bslack) sendWebhook(msg config.Message) (string, error) {
 	}
 	if err := b.mh.Send(matterMessage); err != nil {
 		b.Log.Errorf("Failed to send message via webhook: %#v", err)
-		return "", err
+		return err
 	}
-	return "", nil
+	return nil
 }
 
 func (b *Bslack) sendRTM(msg config.Message) (string, error) {
@@ -317,7 +317,7 @@ func (b *Bslack) sendRTM(msg config.Message) (string, error) {
 	return b.postMessage(&msg, channelInfo)
 }
 
-func (b *Bslack) updateTopicOrPurpose(msg *config.Message, channelInfo *slack.Channel) (bool, error) {
+func (b *Bslack) updateTopicOrPurpose(msg *config.Message, channelInfo *slack.Channel) error {
 	var updateFunc func(channelID string, value string) (*slack.Channel, error)
 
 	incomingChangeType, text := b.extractTopicOrPurpose(msg.Text)
@@ -328,15 +328,15 @@ func (b *Bslack) updateTopicOrPurpose(msg *config.Message, channelInfo *slack.Ch
 		updateFunc = b.rtm.SetPurposeOfConversation
 	default:
 		b.Log.Errorf("Unhandled type received from extractTopicOrPurpose: %s", incomingChangeType)
-		return true, nil
+		return nil
 	}
 	for {
 		_, err := updateFunc(channelInfo.ID, text)
 		if err == nil {
-			return true, nil
+			return nil
 		}
 		if err = b.handleRateLimit(err); err != nil {
-			return true, err
+			return err
 		}
 	}
 }
@@ -348,7 +348,7 @@ func (b *Bslack) handleTopicOrPurpose(msg *config.Message, channelInfo *slack.Ch
 	}
 
 	if b.GetBool("SyncTopic") {
-		return b.updateTopicOrPurpose(msg, channelInfo)
+		return true, b.updateTopicOrPurpose(msg, channelInfo)
 	}
 
 	// Pass along to normal message handlers.

bridge/sshchat/sshchat.go

@@ -30,9 +30,10 @@ func (b *Bsshchat) Connect() error {
 			b.r = bufio.NewScanner(r)
 			b.w = w
 			b.r.Scan()
-			w.Write([]byte("/theme mono\r\n"))
-			b.handleSSHChat()
-			return nil
+			if _, handleErr := w.Write([]byte("/theme mono\r\n")); handleErr != nil {
+				return handleErr
+			}
+			return b.handleSSHChat()
 		})
 	}()
 	if err != nil {
@@ -59,7 +60,9 @@ func (b *Bsshchat) Send(msg config.Message) (string, error) {
 	b.Log.Debugf("=> Receiving %#v", msg)
 	if msg.Extra != nil {
 		for _, rmsg := range helper.HandleExtra(&msg, b.General) {
-			b.w.Write([]byte(rmsg.Username + rmsg.Text + "\r\n"))
+			if _, err := b.w.Write([]byte(rmsg.Username + rmsg.Text + "\r\n")); err != nil {
+				b.Log.Errorf("Could not send extra message: %#v", err)
+			}
 		}
 		if len(msg.Extra["file"]) > 0 {
 			for _, f := range msg.Extra["file"] {
@@ -73,13 +76,15 @@ func (b *Bsshchat) Send(msg config.Message) (string, error) {
 						msg.Text = fi.Comment + ": " + fi.URL
 					}
 				}
-				b.w.Write([]byte(msg.Username + msg.Text))
+				if _, err := b.w.Write([]byte(msg.Username + msg.Text)); err != nil {
+					b.Log.Errorf("Could not send file message: %#v", err)
+				}
 			}
 			return "", nil
 		}
 	}
-	b.w.Write([]byte(msg.Username + msg.Text + "\r\n"))
-	return "", nil
+	_, err := b.w.Write([]byte(msg.Username + msg.Text + "\r\n"))
+	return "", err
 }
 
 /*

matterbridge.go

@@ -28,9 +28,12 @@ func main() {
 	flagGops := flag.Bool("gops", false, "enable gops agent")
 	flag.Parse()
 	if *flagGops {
-		agent.Listen(agent.Options{})
+		if err := agent.Listen(agent.Options{}); err != nil {
+			flog.Errorf("failed to start gops agent: %#v", err)
+		} else {
 			defer agent.Close()
 		}
+	}
 	if *flagVersion {
 		fmt.Printf("version: %s %s\n", version, githash)
 		return

matterclient/helpers.go

@@ -263,8 +263,7 @@ func (m *MMClient) sendWSRequest(action string, data map[string]interface{}) err
 	req.Data = data
 	m.WsSequence++
 	m.log.Debugf("sendWsRequest %#v", req)
-	m.WsClient.WriteJSON(req)
-	return nil
+	return m.WsClient.WriteJSON(req)
 }
 
 func supportedVersion(version string) bool {

matterclient/matterclient.go

@@ -208,7 +208,9 @@ func (m *MMClient) StatusLoop() {
 			return
 		}
 		if m.WsConnected {
-			m.checkAlive()
+			if err := m.checkAlive(); err != nil {
+				log.Errorf("Connection is not alive: %#v", err)
+			}
 			select {
 			case <-m.WsPingChan:
 				m.log.Debug("WS PONG received")

matterclient/messages.go

@@ -53,7 +53,9 @@ func (m *MMClient) parseMessage(rmsg *Message) {
 			m.UpdateUser(user["id"].(string))
 		}
 	case "group_added":
-		m.UpdateChannels()
+		if err := m.UpdateChannels(); err != nil {
+			m.log.Errorf("failed to update channels: %#v", err)
+		}
 		/*
 			case model.ACTION_USER_REMOVED:
 				m.handleWsActionUserRemoved(&rmsg)
@@ -186,7 +188,9 @@ func (m *MMClient) SendDirectMessageProps(toUserId string, msg string, props map
 	channelName := model.GetDMNameFromIds(toUserId, m.User.Id)
 
 	// update our channels
-	m.UpdateChannels()
+	if err := m.UpdateChannels(); err != nil {
+		m.log.Errorf("failed to update channels: %#v", err)
+	}
 
 	// build & send the message
 	msg = strings.Replace(msg, "\r", "", -1)