Add interceptor tests

internal/test/mock_stream.go

@@ -41,6 +41,7 @@ type RTPWithError struct {
 // RTCPWithError is used to send a batch of rtcp packets or an error on a channel
 type RTCPWithError struct {
 	Packets []rtcp.Packet
+	Attr    interceptor.Attributes
 	Err     error
 }
 
@@ -107,21 +108,21 @@ func NewMockStream(info *interceptor.StreamInfo, i interceptor.Interceptor) *Moc
 	go func() {
 		buf := make([]byte, 1500)
 		for {
-			i, _, err := s.rtcpReader.Read(buf, interceptor.Attributes{})
+			i, attr, err := s.rtcpReader.Read(buf, interceptor.Attributes{})
 			if err != nil {
 				if !errors.Is(err, io.EOF) {
-					s.rtcpInModified <- RTCPWithError{Err: err}
+					s.rtcpInModified <- RTCPWithError{Attr: attr, Err: err}
 				}
 				return
 			}
 
 			pkts, err := rtcp.Unmarshal(buf[:i])
 			if err != nil {
-				s.rtcpInModified <- RTCPWithError{Err: err}
+				s.rtcpInModified <- RTCPWithError{Attr: attr, Err: err}
 				return
 			}
 
-			s.rtcpInModified <- RTCPWithError{Packets: pkts}
+			s.rtcpInModified <- RTCPWithError{Attr: attr, Packets: pkts}
 		}
 	}()
 	go func() {

pkg/ccfb/history.go

@@ -31,7 +31,7 @@ type sentPacket struct {
 	departure time.Time
 }
 
-type history struct {
+type historyList struct {
 	lock          sync.Mutex
 	size          int
 	evictList     *list.List
@@ -40,8 +40,8 @@ type history struct {
 	ackedSeqNr    *sequencenumber.Unwrapper
 }
 
-func newHistory(size int) *history {
-	return &history{
+func newHistoryList(size int) *historyList {
+	return &historyList{
 		lock:          sync.Mutex{},
 		size:          size,
 		evictList:     list.New(),
@@ -51,7 +51,7 @@ func newHistory(size int) *history {
 	}
 }
 
-func (h *history) add(seqNr uint16, size uint16, departure time.Time) error {
+func (h *historyList) add(seqNr uint16, size uint16, departure time.Time) error {
 	h.lock.Lock()
 	defer h.lock.Unlock()
 
@@ -76,7 +76,7 @@ func (h *history) add(seqNr uint16, size uint16, departure time.Time) error {
 }
 
 // Must be called while holding the lock
-func (h *history) removeOldest() {
+func (h *historyList) removeOldest() {
 	if ent := h.evictList.Front(); ent != nil {
 		v := h.evictList.Remove(ent)
 		if sp, ok := v.(sentPacket); ok {
@@ -85,7 +85,7 @@ func (h *history) removeOldest() {
 	}
 }
 
-func (h *history) getReportForAck(al acknowledgementList) PacketReportList {
+func (h *historyList) getReportForAck(al acknowledgementList) PacketReportList {
 	h.lock.Lock()
 	defer h.lock.Unlock()
 

pkg/ccfb/history_test.go

@@ -10,7 +10,7 @@ import (
 
 func TestHistory(t *testing.T) {
 	t.Run("errorOnDecreasingSeqNr", func(t *testing.T) {
-		h := newHistory(200)
+		h := newHistoryList(200)
 		assert.NoError(t, h.add(10, 1200, time.Now()))
 		assert.NoError(t, h.add(11, 1200, time.Now()))
 		assert.Error(t, h.add(9, 1200, time.Now()))
@@ -84,7 +84,7 @@ func TestHistory(t *testing.T) {
 		}
 		for i, tc := range cases {
 			t.Run(fmt.Sprintf("%v", i), func(t *testing.T) {
-				h := newHistory(200)
+				h := newHistoryList(200)
 				for _, op := range tc.outgoing {
 					assert.NoError(t, h.add(op.seqNr, op.size, op.ts))
 				}
@@ -97,7 +97,7 @@ func TestHistory(t *testing.T) {
 	})
 
 	t.Run("garbageCollection", func(t *testing.T) {
-		h := newHistory(200)
+		h := newHistoryList(200)
 
 		for i := uint16(0); i < 300; i++ {
 			assert.NoError(t, h.add(i, 1200, time.Time{}.Add(time.Duration(i)*time.Millisecond)))

pkg/ccfb/interceptor.go

@@ -15,8 +15,48 @@ type ccfbAttributesKeyType uint32
 
 const CCFBAttributesKey ccfbAttributesKeyType = iota
 
+type history interface {
+	add(seqNr uint16, size uint16, departure time.Time) error
+	getReportForAck(al acknowledgementList) PacketReportList
+}
+
 type Option func(*Interceptor) error
 
+func HistorySize(size int) Option {
+	return func(i *Interceptor) error {
+		i.historySize = size
+		return nil
+	}
+}
+
+func timeFactory(f func() time.Time) Option {
+	return func(i *Interceptor) error {
+		i.timestamp = f
+		return nil
+	}
+}
+
+func historyFactory(f func(int) history) Option {
+	return func(i *Interceptor) error {
+		i.historyFactory = f
+		return nil
+	}
+}
+
+func ccfbConverterFactory(f func(ts time.Time, feedback *rtcp.CCFeedbackReport) (time.Time, map[uint32]acknowledgementList)) Option {
+	return func(i *Interceptor) error {
+		i.convertCCFB = f
+		return nil
+	}
+}
+
+func twccConverterFactory(f func(ts time.Time, feedback *rtcp.TransportLayerCC) (time.Time, map[uint32]acknowledgementList)) Option {
+	return func(i *Interceptor) error {
+		i.convertTWCC = f
+		return nil
+	}
+}
+
 type InterceptorFactory struct {
 	opts []Option
 }
@@ -30,8 +70,15 @@ func NewInterceptor(opts ...Option) (*InterceptorFactory, error) {
 func (f *InterceptorFactory) NewInterceptor(_ string) (interceptor.Interceptor, error) {
 	i := &Interceptor{
 		NoOp:          interceptor.NoOp{},
+		lock:          sync.Mutex{},
 		timestamp:     time.Now,
-		ssrcToHistory: make(map[uint32]*history),
+		convertCCFB:   convertCCFB,
+		convertTWCC:   convertTWCC,
+		ssrcToHistory: make(map[uint32]history),
+		historySize:   200,
+		historyFactory: func(size int) history {
+			return newHistoryList(size)
+		},
 	}
 	for _, opt := range f.opts {
 		if err := opt(i); err != nil {
@@ -43,9 +90,13 @@ func (f *InterceptorFactory) NewInterceptor(_ string) (interceptor.Interceptor,
 
 type Interceptor struct {
 	interceptor.NoOp
-	lock          sync.Mutex
-	timestamp     func() time.Time
-	ssrcToHistory map[uint32]*history
+	lock           sync.Mutex
+	timestamp      func() time.Time
+	convertCCFB    func(ts time.Time, feedback *rtcp.CCFeedbackReport) (time.Time, map[uint32]acknowledgementList)
+	convertTWCC    func(ts time.Time, feedback *rtcp.TransportLayerCC) (time.Time, map[uint32]acknowledgementList)
+	ssrcToHistory  map[uint32]history
+	historySize    int
+	historyFactory func(int) history
 }
 
 // BindLocalStream implements interceptor.Interceptor.
@@ -67,7 +118,7 @@ func (i *Interceptor) BindLocalStream(info *interceptor.StreamInfo, writer inter
 	if useTWCC {
 		ssrc = 0
 	}
-	i.ssrcToHistory[ssrc] = newHistory(200)
+	i.ssrcToHistory[ssrc] = i.historyFactory(i.historySize)
 
 	return interceptor.RTPWriterFunc(func(header *rtp.Header, payload []byte, attributes interceptor.Attributes) (int, error) {
 		i.lock.Lock()
@@ -109,14 +160,18 @@ func (i *Interceptor) BindRTCPReader(reader interceptor.RTCPReader) interceptor.
 		pktReportLists := map[uint32]*PacketReportList{}
 
 		pkts, err := attr.GetRTCPPackets(buf)
+		if err != nil {
+			return n, attr, err
+		}
 		for _, pkt := range pkts {
 			var reportLists map[uint32]acknowledgementList
 			var reportDeparture time.Time
 			switch fb := pkt.(type) {
 			case *rtcp.CCFeedbackReport:
-				reportDeparture, reportLists = convertCCFB(now, fb)
+				reportDeparture, reportLists = i.convertCCFB(now, fb)
 			case *rtcp.TransportLayerCC:
-				reportDeparture, reportLists = convertTWCC(now, fb)
+				reportDeparture, reportLists = i.convertTWCC(now, fb)
+			default:
 			}
 			for ssrc, reportList := range reportLists {
 				prl := i.ssrcToHistory[ssrc].getReportForAck(reportList)