enable errcheck (#2201)

.golangci.yml

@@ -15,13 +15,49 @@ linters:
   - unconvert
   - wastedassign
   - whitespace
-  disable:
-  - errcheck
 
 issues:
   exclude-use-default: false
 
 linters-settings:
+  errcheck:
+    exclude-functions:
+    - io.Copy
+    - (io.Closer).Close
+    - (io.Writer).Write
+    - (hash.Hash).Write
+    - (net.Conn).Close
+    - (net.Conn).SetReadDeadline
+    - (net.Conn).SetWriteDeadline
+    - (*net.TCPConn).SetKeepAlive
+    - (*net.TCPConn).SetKeepAlivePeriod
+    - (*net.TCPConn).SetNoDelay
+    - (net.Listener).Close
+    - (net.PacketConn).Close
+    - (net.PacketConn).SetReadDeadline
+    - (net.PacketConn).SetWriteDeadline
+    - (net/http.ResponseWriter).Write
+    - (*net/http.Server).Serve
+    - (*net/http.Server).ServeTLS
+    - (*net/http.Server).Shutdown
+    - os.Chdir
+    - os.Mkdir
+    - os.MkdirAll
+    - os.Remove
+    - os.RemoveAll
+    - os.Setenv
+    - os.Unsetenv
+    - (*os.File).WriteString
+    - (*os.File).Close
+    - (github.com/datarhei/gosrt.Conn).Close
+    - (github.com/datarhei/gosrt.Conn).SetReadDeadline
+    - (github.com/datarhei/gosrt.Conn).SetWriteDeadline
+    - (*github.com/bluenviron/gortsplib/v3.Client).Close
+    - (*github.com/bluenviron/gortsplib/v3.Server).Close
+    - (*github.com/bluenviron/gortsplib/v3.ServerSession).Close
+    - (*github.com/bluenviron/gortsplib/v3.ServerStream).Close
+    - (*github.com/bluenviron/gortsplib/v3.ServerConn).Close
+
   govet:
     enable-all: true
     disable:

internal/conf/conf.go

@@ -45,7 +45,8 @@ func loadFromFile(fpath string, conf *Conf) (bool, error) {
 	// other configuration files are not
 	if fpath == "mediamtx.yml" || fpath == "rtsp-simple-server.yml" {
 		if _, err := os.Stat(fpath); errors.Is(err, os.ErrNotExist) {
-			conf.UnmarshalJSON(nil) // load defaults
+			// load defaults
+			conf.UnmarshalJSON(nil) //nolint:errcheck
 			return false, nil
 		}
 	}
@@ -294,7 +295,8 @@ func (conf *Conf) Check() error {
 		pconf := conf.Paths[name]
 		if pconf == nil {
 			pconf = &PathConf{}
-			pconf.UnmarshalJSON(nil) // fill defaults
+			// load defaults
+			pconf.UnmarshalJSON(nil) //nolint:errcheck
 			conf.Paths[name] = pconf
 		}
 

internal/conf/env/env.go

@@ -117,7 +117,8 @@ func loadEnvInternal(env map[string]string, prefix string, rv reflect.Value) err
 			if nv == zero {
 				nv = reflect.New(rt.Elem().Elem())
 				if unm, ok := nv.Interface().(json.Unmarshaler); ok {
-					unm.UnmarshalJSON(nil) // load defaults
+					// load defaults
+					unm.UnmarshalJSON(nil) //nolint:errcheck
 				}
 				rv.SetMapIndex(reflect.ValueOf(mapKeyLower), nv)
 			}

internal/confwatcher/confwatcher.go

@@ -51,7 +51,7 @@ func New(confPath string) (*ConfWatcher, error) {
 
 	err = inner.Add(parentPath)
 	if err != nil {
-		inner.Close()
+		inner.Close() //nolint:errcheck
 		return nil, err
 	}
 
@@ -120,7 +120,7 @@ outer:
 	}
 
 	close(w.signal)
-	w.inner.Close()
+	w.inner.Close() //nolint:errcheck
 }
 
 // Watch returns a channel that is called after the configuration file has changed.

internal/core/api.go

@@ -236,7 +236,7 @@ func newAPI(
 	}
 
 	router := gin.New()
-	router.SetTrustedProxies(nil)
+	router.SetTrustedProxies(nil) //nolint:errcheck
 
 	group := router.Group("/")
 
@@ -387,7 +387,7 @@ func (a *api) onConfigPathsAdd(ctx *gin.Context) {
 	newConfPath := &conf.PathConf{}
 
 	// load default values
-	newConfPath.UnmarshalJSON([]byte("{}"))
+	newConfPath.UnmarshalJSON([]byte("{}")) //nolint:errcheck
 
 	fillStruct(newConfPath, in)
 

internal/core/api_test.go

@@ -265,13 +265,14 @@ func TestAPIPathsList(t *testing.T) {
 		require.NoError(t, err)
 		defer source.Close()
 
-		source.WritePacketRTP(media0, &rtp.Packet{
+		err = source.WritePacketRTP(media0, &rtp.Packet{
 			Header: rtp.Header{
 				Version:     2,
 				PayloadType: 96,
 			},
 			Payload: []byte{0x01, 0x02, 0x03, 0x04},
 		})
+		require.NoError(t, err)
 
 		var out pathList
 		httpRequest(t, hc, http.MethodGet, "http://localhost:9997/v2/paths/list", nil, &out)
@@ -618,7 +619,7 @@ func TestAPIProtocolList(t *testing.T) {
 							0x00, 0x00, 0x03, 0x00, 0xf0, 0x3c, 0x60, 0xc9, 0x20,
 						},*/
 
-						source.WritePacketRTP(medi, &rtp.Packet{
+						err = source.WritePacketRTP(medi, &rtp.Packet{
 							Header: rtp.Header{
 								Version:        2,
 								Marker:         true,
@@ -632,6 +633,7 @@ func TestAPIProtocolList(t *testing.T) {
 								0x05,
 							},
 						})
+						require.NoError(t, err)
 					}
 				}()
 
@@ -654,7 +656,7 @@ func TestAPIProtocolList(t *testing.T) {
 
 				time.Sleep(500 * time.Millisecond)
 
-				source.WritePacketRTP(medi, &rtp.Packet{
+				err = source.WritePacketRTP(medi, &rtp.Packet{
 					Header: rtp.Header{
 						Version:        2,
 						Marker:         true,
@@ -665,6 +667,7 @@ func TestAPIProtocolList(t *testing.T) {
 					},
 					Payload: []byte{0x01, 0x02, 0x03, 0x04},
 				})
+				require.NoError(t, err)
 
 				<-c.incomingTrack
 
@@ -686,7 +689,9 @@ func TestAPIProtocolList(t *testing.T) {
 
 				err = w.WriteH26x(track, 0, 0, true, [][]byte{{1}})
 				require.NoError(t, err)
-				bw.Flush()
+
+				err = bw.Flush()
+				require.NoError(t, err)
 
 				time.Sleep(500 * time.Millisecond)
 			}
@@ -898,7 +903,7 @@ func TestAPIProtocolGet(t *testing.T) {
 							0x00, 0x00, 0x03, 0x00, 0xf0, 0x3c, 0x60, 0xc9, 0x20,
 						},*/
 
-						source.WritePacketRTP(medi, &rtp.Packet{
+						err := source.WritePacketRTP(medi, &rtp.Packet{
 							Header: rtp.Header{
 								Version:        2,
 								Marker:         true,
@@ -912,6 +917,7 @@ func TestAPIProtocolGet(t *testing.T) {
 								0x05,
 							},
 						})
+						require.NoError(t, err)
 					}
 				}()
 
@@ -934,7 +940,7 @@ func TestAPIProtocolGet(t *testing.T) {
 
 				time.Sleep(500 * time.Millisecond)
 
-				source.WritePacketRTP(medi, &rtp.Packet{
+				err = source.WritePacketRTP(medi, &rtp.Packet{
 					Header: rtp.Header{
 						Version:        2,
 						Marker:         true,
@@ -945,6 +951,7 @@ func TestAPIProtocolGet(t *testing.T) {
 					},
 					Payload: []byte{0x01, 0x02, 0x03, 0x04},
 				})
+				require.NoError(t, err)
 
 				<-c.incomingTrack
 
@@ -966,7 +973,9 @@ func TestAPIProtocolGet(t *testing.T) {
 
 				err = w.WriteH26x(track, 0, 0, true, [][]byte{{1}})
 				require.NoError(t, err)
-				bw.Flush()
+
+				err = bw.Flush()
+				require.NoError(t, err)
 
 				time.Sleep(500 * time.Millisecond)
 			}
@@ -1237,9 +1246,9 @@ func TestAPIProtocolKick(t *testing.T) {
 
 				err = w.WriteH26x(track, 0, 0, true, [][]byte{{1}})
 				require.NoError(t, err)
-				bw.Flush()
 
-				// time.Sleep(500 * time.Millisecond)
+				err = bw.Flush()
+				require.NoError(t, err)
 			}
 
 			var pa string

internal/core/core.go

@@ -206,7 +206,7 @@ func (p *Core) createResources(initial bool) error {
 		// on Linux, try to raise the number of file descriptors that can be opened
 		// to allow the maximum possible number of clients
 		// do not check for errors
-		rlimit.Raise()
+		rlimit.Raise() //nolint:errcheck
 
 		gin.SetMode(gin.ReleaseMode)
 

internal/core/hls_http_server.go

@@ -63,7 +63,7 @@ func newHLSHTTPServer( //nolint:dupl
 	}
 
 	router := gin.New()
-	router.SetTrustedProxies(trustedProxies.ToTrustedProxies())
+	router.SetTrustedProxies(trustedProxies.ToTrustedProxies()) //nolint:errcheck
 
 	router.NoRoute(s.onRequest)
 

internal/core/hls_manager_test.go

@@ -143,7 +143,7 @@ func TestHLSRead(t *testing.T) {
 	time.Sleep(500 * time.Millisecond)
 
 	for i := 0; i < 2; i++ {
-		source.WritePacketRTP(medi, &rtp.Packet{
+		err = source.WritePacketRTP(medi, &rtp.Packet{
 			Header: rtp.Header{
 				Version:        2,
 				Marker:         true,
@@ -156,6 +156,7 @@ func TestHLSRead(t *testing.T) {
 				0x05, 0x02, 0x03, 0x04, // IDR
 			},
 		})
+		require.NoError(t, err)
 	}
 
 	hc := &http.Client{Transport: &http.Transport{}}

internal/core/hls_source_test.go

@@ -87,7 +87,7 @@ func (ts *testHLSManager) onSegment1(ctx *gin.Context) {
 
 	w := mpegts.NewWriter(ctx.Writer, []*mpegts.Track{track1, track2})
 
-	w.WriteMPEG4Audio(track2, 1*90000, [][]byte{{1, 2, 3, 4}})
+	w.WriteMPEG4Audio(track2, 1*90000, [][]byte{{1, 2, 3, 4}}) //nolint:errcheck
 }
 
 func (ts *testHLSManager) onSegment2(ctx *gin.Context) {
@@ -97,14 +97,14 @@ func (ts *testHLSManager) onSegment2(ctx *gin.Context) {
 
 	w := mpegts.NewWriter(ctx.Writer, []*mpegts.Track{track1, track2})
 
-	w.WriteH26x(track1, 2*90000, 2*90000, true, [][]byte{
+	w.WriteH26x(track1, 2*90000, 2*90000, true, [][]byte{ //nolint:errcheck
 		{7, 1, 2, 3}, // SPS
 		{8},          // PPS
 	})
 
-	w.WriteMPEG4Audio(track2, 2*90000, [][]byte{{1, 2, 3, 4}})
+	w.WriteMPEG4Audio(track2, 2*90000, [][]byte{{1, 2, 3, 4}}) //nolint:errcheck
 
-	w.WriteH26x(track1, 2*90000, 2*90000, true, [][]byte{
+	w.WriteH26x(track1, 2*90000, 2*90000, true, [][]byte{ //nolint:errcheck
 		{5}, // IDR
 	})
 }

internal/core/metrics.go

@@ -45,7 +45,7 @@ func newMetrics(
 	}
 
 	router := gin.New()
-	router.SetTrustedProxies(nil)
+	router.SetTrustedProxies(nil) //nolint:errcheck
 
 	router.GET("/metrics", m.onMetrics)
 
@@ -215,7 +215,7 @@ func (m *metrics) onMetrics(ctx *gin.Context) {
 	}
 
 	ctx.Writer.WriteHeader(http.StatusOK)
-	io.WriteString(ctx.Writer, out)
+	io.WriteString(ctx.Writer, out) //nolint:errcheck
 }
 
 // pathManagerSet is called by pathManager.

internal/core/rtmp_conn.go

@@ -164,7 +164,16 @@ func (c *rtmpConn) run() {
 		}()
 	}
 
-	err := func() error {
+	err := c.runInner()
+
+	c.ctxCancel()
+
+	c.parent.closeConn(c)
+
+	c.Log(logger.Info, "closed (%v)", err)
+}
+
+func (c *rtmpConn) runInner() error {
 	readerErr := make(chan error)
 	go func() {
 		readerErr <- c.runReader()
@@ -180,13 +189,6 @@ func (c *rtmpConn) run() {
 		<-readerErr
 		return errors.New("terminated")
 	}
-	}()
-
-	c.ctxCancel()
-
-	c.parent.closeConn(c)
-
-	c.Log(logger.Info, "closed (%v)", err)
 }
 
 func (c *rtmpConn) runReader() error {

internal/core/rtmp_listener.go

@@ -31,7 +31,12 @@ func newRTMPListener(
 func (l *rtmpListener) run() {
 	defer l.wg.Done()
 
-	err := func() error {
+	err := l.runInner()
+
+	l.parent.acceptError(err)
+}
+
+func (l *rtmpListener) runInner() error {
 	for {
 		conn, err := l.ln.Accept()
 		if err != nil {
@@ -40,7 +45,4 @@ func (l *rtmpListener) run() {
 
 		l.parent.newConn(conn)
 	}
-	}()
-
-	l.parent.acceptError(err)
 }

internal/core/rtsp_source_test.go

@@ -117,7 +117,7 @@ func TestRTSPSource(t *testing.T) {
 
 			err = s.Start()
 			require.NoError(t, err)
-			defer s.Wait()
+			defer s.Wait() //nolint:errcheck
 			defer s.Close()
 
 			if source == "udp" || source == "tcp" {
@@ -212,7 +212,7 @@ func TestRTSPSourceNoPassword(t *testing.T) {
 	}
 	err = s.Start()
 	require.NoError(t, err)
-	defer s.Wait()
+	defer s.Wait() //nolint:errcheck
 	defer s.Close()
 
 	p, ok := newInstance("rtmp: no\n" +
@@ -268,7 +268,7 @@ func TestRTSPSourceRange(t *testing.T) {
 			}
 			err := s.Start()
 			require.NoError(t, err)
-			defer s.Wait()
+			defer s.Wait() //nolint:errcheck
 			defer s.Close()
 
 			var addConf string

internal/core/srt_listener.go

@@ -32,7 +32,12 @@ func newSRTListener(
 func (l *srtListener) run() {
 	defer l.wg.Done()
 
-	err := func() error {
+	err := l.runInner()
+
+	l.parent.acceptError(err)
+}
+
+func (l *srtListener) runInner() error {
 	for {
 		var sconn *srtConn
 		conn, _, err := l.ln.Accept(func(req srt.ConnRequest) srt.ConnType {
@@ -54,7 +59,4 @@ func (l *srtListener) run() {
 
 		sconn.setConn(conn)
 	}
-	}()
-
-	l.parent.acceptError(err)
 }

internal/core/srt_server_test.go

@@ -50,7 +50,9 @@ func TestSRTServer(t *testing.T) {
 		},
 	})
 	require.NoError(t, err)
-	bw.Flush()
+
+	err = bw.Flush()
+	require.NoError(t, err)
 
 	time.Sleep(500 * time.Millisecond)
 
@@ -71,7 +73,9 @@ func TestSRTServer(t *testing.T) {
 		},
 	})
 	require.NoError(t, err)
-	bw.Flush()
+
+	err = bw.Flush()
+	require.NoError(t, err)
 
 	r, err := mpegts.NewReader(reader)
 	require.NoError(t, err)

internal/core/srt_source_test.go

@@ -51,13 +51,17 @@ func TestSRTSource(t *testing.T) {
 			},
 		})
 		require.NoError(t, err)
-		bw.Flush()
+
+		err = bw.Flush()
+		require.NoError(t, err)
 
 		<-connected
 
 		err = w.WriteH26x(track, 0, 0, true, [][]byte{{5, 2}})
 		require.NoError(t, err)
-		bw.Flush()
+
+		err = bw.Flush()
+		require.NoError(t, err)
 
 		<-done
 	}()

internal/core/udp_source_test.go

@@ -55,13 +55,17 @@ func TestUDPSource(t *testing.T) {
 			},
 		})
 		require.NoError(t, err)
-		bw.Flush()
+
+		err = bw.Flush()
+		require.NoError(t, err)
 
 		<-connected
 
 		err = w.WriteH26x(track, 0, 0, true, [][]byte{{5, 2}})
 		require.NoError(t, err)
-		bw.Flush()
+
+		err = bw.Flush()
+		require.NoError(t, err)
 	}()
 
 	medias, baseURL, _, err := c.Describe(u)

internal/core/webrtc_http_server.go

@@ -67,7 +67,7 @@ func newWebRTCHTTPServer( //nolint:dupl
 	}
 
 	router := gin.New()
-	router.SetTrustedProxies(trustedProxies.ToTrustedProxies())
+	router.SetTrustedProxies(trustedProxies.ToTrustedProxies()) //nolint:errcheck
 	router.NoRoute(s.onRequest)
 
 	network, address := restrictNetwork("tcp", address)

internal/core/webrtc_manager_test.go

@@ -242,7 +242,7 @@ func TestWebRTCRead(t *testing.T) {
 
 			time.Sleep(500 * time.Millisecond)
 
-			source.WritePacketRTP(medi, &rtp.Packet{
+			err = source.WritePacketRTP(medi, &rtp.Packet{
 				Header: rtp.Header{
 					Version:        2,
 					Marker:         true,
@@ -253,6 +253,7 @@ func TestWebRTCRead(t *testing.T) {
 				},
 				Payload: []byte{3},
 			})
+			require.NoError(t, err)
 
 			trak := <-c.incomingTrack
 
@@ -289,7 +290,7 @@ func TestWebRTCReadNotFound(t *testing.T) {
 		ICEServers: iceServers,
 	})
 	require.NoError(t, err)
-	defer pc.Close()
+	defer pc.Close() //nolint:errcheck
 
 	_, err = pc.AddTransceiverFromKind(webrtc.RTPCodecTypeVideo)
 	require.NoError(t, err)

internal/core/webrtc_outgoing_track.go

@@ -47,7 +47,10 @@ func newWebRTCOutgoingTrackVideo(medias media.Medias) (*webRTCOutgoingTrack, err
 			PayloadType:    105,
 			PayloadMaxSize: webrtcPayloadMaxSize,
 		}
-		encoder.Init()
+		err = encoder.Init()
+		if err != nil {
+			return nil, err
+		}
 
 		return &webRTCOutgoingTrack{
 			media:  videoMedia,
@@ -66,7 +69,7 @@ func newWebRTCOutgoingTrackVideo(medias media.Medias) (*webRTCOutgoingTrack, err
 				}
 
 				for _, pkt := range packets {
-					webRTCTrak.WriteRTP(pkt)
+					webRTCTrak.WriteRTP(pkt) //nolint:errcheck
 				}
 
 				return nil
@@ -94,7 +97,10 @@ func newWebRTCOutgoingTrackVideo(medias media.Medias) (*webRTCOutgoingTrack, err
 			PayloadType:    96,
 			PayloadMaxSize: webrtcPayloadMaxSize,
 		}
-		encoder.Init()
+		err = encoder.Init()
+		if err != nil {
+			return nil, err
+		}
 
 		return &webRTCOutgoingTrack{
 			media:  videoMedia,
@@ -113,7 +119,7 @@ func newWebRTCOutgoingTrackVideo(medias media.Medias) (*webRTCOutgoingTrack, err
 				}
 
 				for _, pkt := range packets {
-					webRTCTrak.WriteRTP(pkt)
+					webRTCTrak.WriteRTP(pkt) //nolint:errcheck
 				}
 
 				return nil
@@ -141,7 +147,10 @@ func newWebRTCOutgoingTrackVideo(medias media.Medias) (*webRTCOutgoingTrack, err
 			PayloadType:    96,
 			PayloadMaxSize: webrtcPayloadMaxSize,
 		}
-		encoder.Init()
+		err = encoder.Init()
+		if err != nil {
+			return nil, err
+		}
 
 		return &webRTCOutgoingTrack{
 			media:  videoMedia,
@@ -160,7 +169,7 @@ func newWebRTCOutgoingTrackVideo(medias media.Medias) (*webRTCOutgoingTrack, err
 				}
 
 				for _, pkt := range packets {
-					webRTCTrak.WriteRTP(pkt)
+					webRTCTrak.WriteRTP(pkt) //nolint:errcheck
 				}
 
 				return nil
@@ -188,7 +197,10 @@ func newWebRTCOutgoingTrackVideo(medias media.Medias) (*webRTCOutgoingTrack, err
 			PayloadType:    96,
 			PayloadMaxSize: webrtcPayloadMaxSize,
 		}
-		encoder.Init()
+		err = encoder.Init()
+		if err != nil {
+			return nil, err
+		}
 
 		var lastPTS time.Duration
 		firstNALUReceived := false
@@ -220,7 +232,7 @@ func newWebRTCOutgoingTrackVideo(medias media.Medias) (*webRTCOutgoingTrack, err
 				}
 
 				for _, pkt := range packets {
-					webRTCTrak.WriteRTP(pkt)
+					webRTCTrak.WriteRTP(pkt) //nolint:errcheck
 				}
 
 				return nil
@@ -255,7 +267,7 @@ func newWebRTCOutgoingTrackAudio(medias media.Medias) (*webRTCOutgoingTrack, err
 			track:  webRTCTrak,
 			cb: func(unit formatprocessor.Unit) error {
 				for _, pkt := range unit.GetRTPPackets() {
-					webRTCTrak.WriteRTP(pkt)
+					webRTCTrak.WriteRTP(pkt) //nolint:errcheck
 				}
 
 				return nil
@@ -285,7 +297,7 @@ func newWebRTCOutgoingTrackAudio(medias media.Medias) (*webRTCOutgoingTrack, err
 			track:  webRTCTrak,
 			cb: func(unit formatprocessor.Unit) error {
 				for _, pkt := range unit.GetRTPPackets() {
-					webRTCTrak.WriteRTP(pkt)
+					webRTCTrak.WriteRTP(pkt) //nolint:errcheck
 				}
 
 				return nil
@@ -322,7 +334,7 @@ func newWebRTCOutgoingTrackAudio(medias media.Medias) (*webRTCOutgoingTrack, err
 			track:  webRTCTrak,
 			cb: func(unit formatprocessor.Unit) error {
 				for _, pkt := range unit.GetRTPPackets() {
-					webRTCTrak.WriteRTP(pkt)
+					webRTCTrak.WriteRTP(pkt) //nolint:errcheck
 				}
 
 				return nil

internal/externalcmd/cmd_unix.go

@@ -50,7 +50,7 @@ func (e *Cmd) runOSSpecific() error {
 
 	select {
 	case <-e.terminate:
-		syscall.Kill(cmd.Process.Pid, syscall.SIGINT)
+		syscall.Kill(cmd.Process.Pid, syscall.SIGINT) //nolint:errcheck
 		<-cmdDone
 		return errTerminated
 

internal/formatprocessor/generic_test.go

@@ -13,7 +13,8 @@ func TestGenericRemovePadding(t *testing.T) {
 		PayloadTyp: 96,
 		RTPMa:      "private/90000",
 	}
-	forma.Init()
+	err := forma.Init()
+	require.NoError(t, err)
 
 	p, err := New(1472, forma, false, nil)
 	require.NoError(t, err)

internal/formatprocessor/h264_test.go

@@ -30,7 +30,8 @@ func TestH264DynamicParams(t *testing.T) {
 			RTPPackets: []*rtp.Packet{pkts[0]},
 		},
 	}
-	p.Process(data, true)
+	err = p.Process(data, true)
+	require.NoError(t, err)
 
 	require.Equal(t, [][]byte{
 		{byte(h264.NALUTypeIDR)},
@@ -38,31 +39,37 @@ func TestH264DynamicParams(t *testing.T) {
 
 	pkts, err = enc.Encode([][]byte{{7, 4, 5, 6}}, 0) // SPS
 	require.NoError(t, err)
-	p.Process(&UnitH264{
+
+	err = p.Process(&UnitH264{
 		BaseUnit: BaseUnit{
 			RTPPackets: []*rtp.Packet{pkts[0]},
 		},
 	}, false)
+	require.NoError(t, err)
 
 	pkts, err = enc.Encode([][]byte{{8, 1}}, 0) // PPS
 	require.NoError(t, err)
-	p.Process(&UnitH264{
+
+	err = p.Process(&UnitH264{
 		BaseUnit: BaseUnit{
 			RTPPackets: []*rtp.Packet{pkts[0]},
 		},
 	}, false)
+	require.NoError(t, err)
 
 	require.Equal(t, []byte{7, 4, 5, 6}, forma.SPS)
 	require.Equal(t, []byte{8, 1}, forma.PPS)
 
 	pkts, err = enc.Encode([][]byte{{byte(h264.NALUTypeIDR)}}, 0)
 	require.NoError(t, err)
+
 	data = &UnitH264{
 		BaseUnit: BaseUnit{
 			RTPPackets: []*rtp.Packet{pkts[0]},
 		},
 	}
-	p.Process(data, true)
+	err = p.Process(data, true)
+	require.NoError(t, err)
 
 	require.Equal(t, [][]byte{
 		{0x07, 4, 5, 6},
@@ -127,7 +134,9 @@ func TestH264OversizedPackets(t *testing.T) {
 				RTPPackets: []*rtp.Packet{pkt},
 			},
 		}
-		p.Process(data, false)
+		err := p.Process(data, false)
+		require.NoError(t, err)
+
 		out = append(out, data.RTPPackets...)
 	}
 
@@ -190,7 +199,8 @@ func TestH264EmptyPacket(t *testing.T) {
 		},
 	}
 
-	p.Process(unit, false)
+	err = p.Process(unit, false)
+	require.NoError(t, err)
 
 	// if all NALUs have been removed, no RTP packets must be generated.
 	require.Equal(t, []*rtp.Packet(nil), unit.RTPPackets)

internal/formatprocessor/h265_test.go

@@ -29,7 +29,8 @@ func TestH265DynamicParams(t *testing.T) {
 			RTPPackets: []*rtp.Packet{pkts[0]},
 		},
 	}
-	p.Process(data, true)
+	err = p.Process(data, true)
+	require.NoError(t, err)
 
 	require.Equal(t, [][]byte{
 		{byte(h265.NALUType_CRA_NUT) << 1, 0},
@@ -37,27 +38,33 @@ func TestH265DynamicParams(t *testing.T) {
 
 	pkts, err = enc.Encode([][]byte{{byte(h265.NALUType_VPS_NUT) << 1, 1, 2, 3}}, 0)
 	require.NoError(t, err)
-	p.Process(&UnitH265{
+
+	err = p.Process(&UnitH265{
 		BaseUnit: BaseUnit{
 			RTPPackets: []*rtp.Packet{pkts[0]},
 		},
 	}, false)
+	require.NoError(t, err)
 
 	pkts, err = enc.Encode([][]byte{{byte(h265.NALUType_SPS_NUT) << 1, 4, 5, 6}}, 0)
 	require.NoError(t, err)
-	p.Process(&UnitH265{
+
+	err = p.Process(&UnitH265{
 		BaseUnit: BaseUnit{
 			RTPPackets: []*rtp.Packet{pkts[0]},
 		},
 	}, false)
+	require.NoError(t, err)
 
 	pkts, err = enc.Encode([][]byte{{byte(h265.NALUType_PPS_NUT) << 1, 7, 8, 9}}, 0)
 	require.NoError(t, err)
-	p.Process(&UnitH265{
+
+	err = p.Process(&UnitH265{
 		BaseUnit: BaseUnit{
 			RTPPackets: []*rtp.Packet{pkts[0]},
 		},
 	}, false)
+	require.NoError(t, err)
 
 	require.Equal(t, []byte{byte(h265.NALUType_VPS_NUT) << 1, 1, 2, 3}, forma.VPS)
 	require.Equal(t, []byte{byte(h265.NALUType_SPS_NUT) << 1, 4, 5, 6}, forma.SPS)
@@ -65,12 +72,14 @@ func TestH265DynamicParams(t *testing.T) {
 
 	pkts, err = enc.Encode([][]byte{{byte(h265.NALUType_CRA_NUT) << 1, 0}}, 0)
 	require.NoError(t, err)
+
 	data = &UnitH265{
 		BaseUnit: BaseUnit{
 			RTPPackets: []*rtp.Packet{pkts[0]},
 		},
 	}
-	p.Process(data, true)
+	err = p.Process(data, true)
+	require.NoError(t, err)
 
 	require.Equal(t, [][]byte{
 		{byte(h265.NALUType_VPS_NUT) << 1, 1, 2, 3},
@@ -124,7 +133,9 @@ func TestH265OversizedPackets(t *testing.T) {
 				RTPPackets: []*rtp.Packet{pkt},
 			},
 		}
-		p.Process(data, false)
+		err = p.Process(data, false)
+		require.NoError(t, err)
+
 		out = append(out, data.RTPPackets...)
 	}
 
@@ -187,7 +198,8 @@ func TestH265EmptyPacket(t *testing.T) {
 		},
 	}
 
-	p.Process(unit, false)
+	err = p.Process(unit, false)
+	require.NoError(t, err)
 
 	// if all NALUs have been removed, no RTP packets must be generated.
 	require.Equal(t, []*rtp.Packet(nil), unit.RTPPackets)

internal/httpserv/handler_logger.go

@@ -35,7 +35,7 @@ func (w *loggerWriter) WriteHeader(statusCode int) {
 func (w *loggerWriter) dump() string {
 	var buf bytes.Buffer
 	fmt.Fprintf(&buf, "%s %d %s\n", "HTTP/1.1", w.status, http.StatusText(w.status))
-	w.w.Header().Write(&buf)
+	w.w.Header().Write(&buf) //nolint:errcheck
 	buf.Write([]byte("\n"))
 	if w.buf.Len() > 0 {
 		fmt.Fprintf(&buf, "(body of %d bytes)", w.buf.Len())

internal/logger/destination_file.go

@@ -27,7 +27,7 @@ func (d *destinationFile) log(t time.Time, level Level, format string, args ...i
 	writeTime(&d.buf, t, false)
 	writeLevel(&d.buf, level, false)
 	writeContent(&d.buf, format, args)
-	d.file.Write(d.buf.Bytes())
+	d.file.Write(d.buf.Bytes()) //nolint:errcheck
 }
 
 func (d *destinationFile) close() {

internal/logger/destination_stdout.go

@@ -25,7 +25,7 @@ func (d *destinationStdout) log(t time.Time, level Level, format string, args ..
 	writeTime(&d.buf, t, d.useColor)
 	writeLevel(&d.buf, level, d.useColor)
 	writeContent(&d.buf, format, args)
-	os.Stdout.Write(d.buf.Bytes())
+	os.Stdout.Write(d.buf.Bytes()) //nolint:errcheck
 }
 
 func (d *destinationStdout) close() {

internal/rtmp/bytecounter/writer_test.go

@@ -13,6 +13,7 @@ func TestWriter(t *testing.T) {
 	w := NewWriter(&buf)
 	w.SetCount(100)
 
-	w.Write(bytes.Repeat([]byte{0x01}, 64))
+	_, err := w.Write(bytes.Repeat([]byte{0x01}, 64))
+	require.NoError(t, err)
 	require.Equal(t, uint64(100+64), w.Count())
 }

internal/rtmp/conn_test.go

@@ -490,6 +490,6 @@ func BenchmarkRead(b *testing.B) {
 	conn := newNoHandshakeConn(&buf)
 
 	for n := 0; n < b.N; n++ {
-		conn.Read()
+		conn.Read() //nolint:errcheck
 	}
 }

internal/rtmp/message/readwriter.go

@@ -44,9 +44,12 @@ func (rw *ReadWriter) Read() (Message, error) {
 		rw.w.SetAcknowledgeValue(tmsg.Value)
 
 	case *UserControlPingRequest:
-		rw.w.Write(&UserControlPingResponse{
+		err := rw.w.Write(&UserControlPingResponse{
 			ServerTime: tmsg.ServerTime,
 		})
+		if err != nil {
+			return nil, err
+		}
 	}
 
 	return msg, nil

internal/rtmp/rawmessage/reader.go

@@ -266,7 +266,7 @@ func (r *Reader) Read() (*Message, error) {
 			r.chunkStreams[chunkStreamID] = rc
 		}
 
-		r.br.UnreadByte()
+		r.br.UnreadByte() //nolint:errcheck
 
 		msg, err := rc.readMessage(typ)
 		if err != nil {

internal/webrtcpc/pc.go

@@ -90,7 +90,7 @@ func New(
 
 // Close closes the connection.
 func (co *PeerConnection) Close() {
-	co.PeerConnection.Close()
+	co.PeerConnection.Close() //nolint:errcheck
 	<-co.closed
 }
 

internal/websocket/serverconn.go

@@ -57,7 +57,7 @@ func NewServerConn(w http.ResponseWriter, req *http.Request) (*ServerConn, error
 
 // Close closes a ServerConn.
 func (c *ServerConn) Close() {
-	c.wc.Close()
+	c.wc.Close() //nolint:errcheck
 	close(c.terminate)
 }
 
@@ -67,10 +67,10 @@ func (c *ServerConn) RemoteAddr() net.Addr {
 }
 
 func (c *ServerConn) run() {
-	c.wc.SetReadDeadline(time.Now().Add(pingInterval + pingTimeout))
+	c.wc.SetReadDeadline(time.Now().Add(pingInterval + pingTimeout)) //nolint:errcheck
 
 	c.wc.SetPongHandler(func(string) error {
-		c.wc.SetReadDeadline(time.Now().Add(pingInterval + pingTimeout))
+		c.wc.SetReadDeadline(time.Now().Add(pingInterval + pingTimeout)) //nolint:errcheck
 		return nil
 	})
 
@@ -80,13 +80,13 @@ func (c *ServerConn) run() {
 	for {
 		select {
 		case byts := <-c.write:
-			c.wc.SetWriteDeadline(time.Now().Add(writeTimeout))
+			c.wc.SetWriteDeadline(time.Now().Add(writeTimeout)) //nolint:errcheck
 			err := c.wc.WriteMessage(websocket.TextMessage, byts)
 			c.writeErr <- err
 
 		case <-pingTicker.C:
-			c.wc.SetWriteDeadline(time.Now().Add(writeTimeout))
-			c.wc.WriteMessage(websocket.PingMessage, nil)
+			c.wc.SetWriteDeadline(time.Now().Add(writeTimeout)) //nolint:errcheck
+			c.wc.WriteMessage(websocket.PingMessage, nil)       //nolint:errcheck
 
 		case <-c.terminate:
 			return

internal/websocket/serverconn_test.go

@@ -37,7 +37,7 @@ func TestServerConn(t *testing.T) {
 	c, res, err := websocket.DefaultDialer.Dial("ws://localhost:6344/", nil)
 	require.NoError(t, err)
 	defer res.Body.Close()
-	defer c.Close()
+	defer c.Close() //nolint:errcheck
 
 	c.SetPingHandler(func(msg string) error {
 		close(pingReceived)
@@ -49,7 +49,8 @@ func TestServerConn(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, "testing", msg)
 
-	c.ReadMessage()
+	_, _, err = c.ReadMessage()
+	require.Error(t, err)
 
 	<-pingReceived
 }

internal/whip/link_header.go

@@ -16,7 +16,7 @@ func quoteCredential(v string) string {
 
 func unquoteCredential(v string) string {
 	var s string
-	json.Unmarshal([]byte("\""+v+"\""), &s)
+	json.Unmarshal([]byte("\""+v+"\""), &s) //nolint:errcheck
 	return s
 }