reuse structs when reading Requests, Responses and Headers

base/content.go

@@ -0,0 +1,45 @@
+package base
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"strconv"
+)
+
+func contentRead(rb *bufio.Reader, header Header) ([]byte, error) {
+	cls, ok := header["Content-Length"]
+	if !ok || len(cls) != 1 {
+		return nil, nil
+	}
+
+	cl, err := strconv.ParseInt(cls[0], 10, 64)
+	if err != nil {
+		return nil, fmt.Errorf("invalid Content-Length")
+	}
+
+	if cl > rtspMaxContentLength {
+		return nil, fmt.Errorf("Content-Length exceeds %d", rtspMaxContentLength)
+	}
+
+	ret := make([]byte, cl)
+	n, err := io.ReadFull(rb, ret)
+	if err != nil && n != len(ret) {
+		return nil, err
+	}
+
+	return ret, nil
+}
+
+func contentWrite(bw *bufio.Writer, content []byte) error {
+	if len(content) == 0 {
+		return nil
+	}
+
+	_, err := bw.Write(content)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

base/header.go

@@ -34,32 +34,30 @@ type HeaderValue []string
 // Header is a RTSP reader, present in both Requests and Responses.
 type Header map[string]HeaderValue
 
-func headerRead(rb *bufio.Reader) (Header, error) {
-	h := make(Header)
-
+func (h Header) read(rb *bufio.Reader) error {
 	for {
 		byt, err := rb.ReadByte()
 		if err != nil {
-			return nil, err
+			return err
 		}
 
 		if byt == '\r' {
 			err := readByteEqual(rb, '\n')
 			if err != nil {
-				return nil, err
+				return err
 			}
 
 			break
 		}
 
 		if len(h) >= headerMaxEntryCount {
-			return nil, fmt.Errorf("headers count exceeds %d", headerMaxEntryCount)
+			return fmt.Errorf("headers count exceeds %d", headerMaxEntryCount)
 		}
 
 		key := string([]byte{byt})
 		byts, err := readBytesLimited(rb, ':', headerMaxKeyLength-1)
 		if err != nil {
-			return nil, err
+			return err
 		}
 		key += string(byts[:len(byts)-1])
 		key = headerKeyNormalize(key)
@@ -69,7 +67,7 @@ func headerRead(rb *bufio.Reader) (Header, error) {
 		for {
 			byt, err := rb.ReadByte()
 			if err != nil {
-				return nil, err
+				return err
 			}
 
 			if byt != ' ' {
@@ -80,23 +78,23 @@ func headerRead(rb *bufio.Reader) (Header, error) {
 
 		byts, err = readBytesLimited(rb, '\r', headerMaxValueLength)
 		if err != nil {
-			return nil, err
+			return err
 		}
 		val := string(byts[:len(byts)-1])
 
 		if len(val) == 0 {
-			return nil, fmt.Errorf("empty header value")
+			return fmt.Errorf("empty header value")
 		}
 
 		err = readByteEqual(rb, '\n')
 		if err != nil {
-			return nil, err
+			return err
 		}
 
 		h[key] = append(h[key], val)
 	}
 
-	return h, nil
+	return nil
 }
 
 func (h Header) write(wb *bufio.Writer) error {

base/header_test.go

@@ -93,9 +93,10 @@ var casesHeader = []struct {
 func TestHeaderRead(t *testing.T) {
 	for _, c := range casesHeader {
 		t.Run(c.name, func(t *testing.T) {
-			req, err := headerRead(bufio.NewReader(bytes.NewBuffer(c.dec)))
+			h := make(Header)
+			err := h.read(bufio.NewReader(bytes.NewBuffer(c.dec)))
 			require.NoError(t, err)
-			require.Equal(t, c.header, req)
+			require.Equal(t, c.header, h)
 		})
 	}
 }

base/interleavedframe.go

@@ -11,8 +11,8 @@ const (
 	interleavedFrameMagicByte = 0x24
 )
 
-// ReadInterleavedFrameOrResponse reads an InterleavedFrame or a Response.
-func ReadInterleavedFrameOrResponse(frame *InterleavedFrame, br *bufio.Reader) (interface{}, error) {
+// ReadInterleavedFrameOrRequest reads an InterleavedFrame or a Response.
+func ReadInterleavedFrameOrRequest(frame *InterleavedFrame, req *Request, br *bufio.Reader) (interface{}, error) {
 	b, err := br.ReadByte()
 	if err != nil {
 		return nil, err
@@ -27,11 +27,15 @@ func ReadInterleavedFrameOrResponse(frame *InterleavedFrame, br *bufio.Reader) (
 		return frame, err
 	}
 
-	return ReadResponse(br)
+	err = req.Read(br)
+	if err != nil {
+		return nil, err
+	}
+	return req, nil
 }
 
-// ReadInterleavedFrameOrRequest reads an InterleavedFrame or a Response.
-func ReadInterleavedFrameOrRequest(frame *InterleavedFrame, br *bufio.Reader) (interface{}, error) {
+// ReadInterleavedFrameOrResponse reads an InterleavedFrame or a Response.
+func ReadInterleavedFrameOrResponse(frame *InterleavedFrame, res *Response, br *bufio.Reader) (interface{}, error) {
 	b, err := br.ReadByte()
 	if err != nil {
 		return nil, err
@@ -46,7 +50,11 @@ func ReadInterleavedFrameOrRequest(frame *InterleavedFrame, br *bufio.Reader) (i
 		return frame, err
 	}
 
-	return ReadRequest(br)
+	err = res.Read(br)
+	if err != nil {
+		return nil, err
+	}
+	return res, nil
 }
 
 // InterleavedFrame is an interleaved frame, and allows to transfer binary data

base/request.go

@@ -53,66 +53,65 @@ type Request struct {
 	SkipResponse bool
 }
 
-// ReadRequest reads a request.
-func ReadRequest(rb *bufio.Reader) (*Request, error) {
-	req := &Request{}
-
+// Read reads a request.
+func (req *Request) Read(rb *bufio.Reader) error {
 	byts, err := readBytesLimited(rb, ' ', requestMaxLethodLength)
 	if err != nil {
-		return nil, err
+		return err
 	}
 	req.Method = Method(byts[:len(byts)-1])
 
 	if req.Method == "" {
-		return nil, fmt.Errorf("empty method")
+		return fmt.Errorf("empty method")
 	}
 
 	byts, err = readBytesLimited(rb, ' ', requestMaxPathLength)
 	if err != nil {
-		return nil, err
+		return err
 	}
 	rawUrl := string(byts[:len(byts)-1])
 
 	if rawUrl == "" {
-		return nil, fmt.Errorf("empty url")
+		return fmt.Errorf("empty url")
 	}
 
 	ur, err := url.Parse(rawUrl)
 	if err != nil {
-		return nil, fmt.Errorf("unable to parse url (%v)", rawUrl)
+		return fmt.Errorf("unable to parse url (%v)", rawUrl)
 	}
 	req.Url = ur
 
 	if req.Url.Scheme != "rtsp" {
-		return nil, fmt.Errorf("invalid url scheme (%v)", rawUrl)
+		return fmt.Errorf("invalid url scheme (%v)", rawUrl)
 	}
 
 	byts, err = readBytesLimited(rb, '\r', requestMaxProtocolLength)
 	if err != nil {
-		return nil, err
+		return err
 	}
 	proto := string(byts[:len(byts)-1])
 
 	if proto != rtspProtocol10 {
-		return nil, fmt.Errorf("expected '%s', got '%s'", rtspProtocol10, proto)
+		return fmt.Errorf("expected '%s', got '%s'", rtspProtocol10, proto)
 	}
 
 	err = readByteEqual(rb, '\n')
 	if err != nil {
-		return nil, err
+		return err
 	}
 
-	req.Header, err = headerRead(rb)
+	req.Header = make(Header)
+	err = req.Header.read(rb)
 	if err != nil {
-		return nil, err
+		return err
 	}
 
-	req.Content, err = readContent(rb, req.Header)
+	req.Content, err = contentRead(rb, req.Header)
 	if err != nil {
-		return nil, err
+		return err
 	}
 
-	return req, nil
+	return nil
 }
 
 // Write writes a request.
@@ -139,7 +138,7 @@ func (req Request) Write(bw *bufio.Writer) error {
 		return err
 	}
 
-	err = writeContent(bw, req.Content)
+	err = contentWrite(bw, req.Content)
 	if err != nil {
 		return err
 	}

base/request_test.go

@@ -12,7 +12,7 @@ import (
 var casesRequest = []struct {
 	name string
 	byts []byte
-	req  *Request
+	req  Request
 }{
 	{
 		"options",
@@ -21,7 +21,7 @@ var casesRequest = []struct {
 			"Proxy-Require: gzipped-messages\r\n" +
 			"Require: implicit-play\r\n" +
 			"\r\n"),
-		&Request{
+		Request{
 			Method: "OPTIONS",
 			Url:    &url.URL{Scheme: "rtsp", Host: "example.com", Path: "/media.mp4"},
 			Header: Header{
@@ -36,7 +36,7 @@ var casesRequest = []struct {
 		[]byte("DESCRIBE rtsp://example.com/media.mp4 RTSP/1.0\r\n" +
 			"CSeq: 2\r\n" +
 			"\r\n"),
-		&Request{
+		Request{
 			Method: "DESCRIBE",
 			Url:    &url.URL{Scheme: "rtsp", Host: "example.com", Path: "/media.mp4"},
 			Header: Header{
@@ -64,7 +64,7 @@ var casesRequest = []struct {
 			"a=recvonly\n" +
 			"m=audio 3456 RTP/AVP 0\n" +
 			"m=video 2232 RTP/AVP 31\n"),
-		&Request{
+		Request{
 			Method: "ANNOUNCE",
 			Url:    &url.URL{Scheme: "rtsp", Host: "example.com", Path: "/media.mp4"},
 			Header: Header{
@@ -98,7 +98,7 @@ var casesRequest = []struct {
 			"\r\n" +
 			"packets_received\n" +
 			"jitter\n"),
-		&Request{
+		Request{
 			Method: "GET_PARAMETER",
 			Url:    &url.URL{Scheme: "rtsp", Host: "example.com", Path: "/media.mp4"},
 			Header: Header{
@@ -115,9 +115,10 @@ var casesRequest = []struct {
 }
 
 func TestRequestRead(t *testing.T) {
+	var req Request
 	for _, c := range casesRequest {
 		t.Run(c.name, func(t *testing.T) {
-			req, err := ReadRequest(bufio.NewReader(bytes.NewBuffer(c.byts)))
+			err := req.Read(bufio.NewReader(bytes.NewBuffer(c.byts)))
 			require.NoError(t, err)
 			require.Equal(t, c.req, req)
 		})

base/response.go

@@ -132,58 +132,57 @@ type Response struct {
 	Content []byte
 }
 
-// ReadResponse reads a response.
-func ReadResponse(rb *bufio.Reader) (*Response, error) {
-	res := &Response{}
-
+// Read reads a response.
+func (res *Response) Read(rb *bufio.Reader) error {
 	byts, err := readBytesLimited(rb, ' ', 255)
 	if err != nil {
-		return nil, err
+		return err
 	}
 	proto := string(byts[:len(byts)-1])
 
 	if proto != rtspProtocol10 {
-		return nil, fmt.Errorf("expected '%s', got '%s'", rtspProtocol10, proto)
+		return fmt.Errorf("expected '%s', got '%s'", rtspProtocol10, proto)
 	}
 
 	byts, err = readBytesLimited(rb, ' ', 4)
 	if err != nil {
-		return nil, err
+		return err
 	}
 	statusCodeStr := string(byts[:len(byts)-1])
 
 	statusCode64, err := strconv.ParseInt(statusCodeStr, 10, 32)
 	if err != nil {
-		return nil, fmt.Errorf("unable to parse status code")
+		return fmt.Errorf("unable to parse status code")
 	}
 	res.StatusCode = StatusCode(statusCode64)
 
 	byts, err = readBytesLimited(rb, '\r', 255)
 	if err != nil {
-		return nil, err
+		return err
 	}
 	res.StatusMessage = string(byts[:len(byts)-1])
 
 	if len(res.StatusMessage) == 0 {
-		return nil, fmt.Errorf("empty status")
+		return fmt.Errorf("empty status")
 	}
 
 	err = readByteEqual(rb, '\n')
 	if err != nil {
-		return nil, err
+		return err
 	}
 
-	res.Header, err = headerRead(rb)
+	res.Header = make(Header)
+	err = res.Header.read(rb)
 	if err != nil {
-		return nil, err
+		return err
 	}
 
-	res.Content, err = readContent(rb, res.Header)
+	res.Content, err = contentRead(rb, res.Header)
 	if err != nil {
-		return nil, err
+		return err
 	}
 
-	return res, nil
+	return nil
 }
 
 // Write writes a Response.
@@ -208,7 +207,7 @@ func (res Response) Write(bw *bufio.Writer) error {
 		return err
 	}
 
-	err = writeContent(bw, res.Content)
+	err = contentWrite(bw, res.Content)
 	if err != nil {
 		return err
 	}

base/response_test.go

@@ -11,7 +11,7 @@ import (
 var casesResponse = []struct {
 	name string
 	byts []byte
-	res  *Response
+	res  Response
 }{
 	{
 		"ok with single header",
@@ -20,7 +20,7 @@ var casesResponse = []struct {
 			"Public: DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE\r\n" +
 			"\r\n",
 		),
-		&Response{
+		Response{
 			StatusCode:    StatusOK,
 			StatusMessage: "OK",
 			Header: Header{
@@ -39,7 +39,7 @@ var casesResponse = []struct {
 			"WWW-Authenticate: Basic realm=\"4419b63f5e51\"\r\n" +
 			"\r\n",
 		),
-		&Response{
+		Response{
 			StatusCode:    StatusOK,
 			StatusMessage: "OK",
 			Header: Header{
@@ -78,7 +78,7 @@ var casesResponse = []struct {
 			"a=AvgBitRate:integer;65790\n" +
 			"a=StreamName:string;\"hinted audio track\"\n",
 		),
-		&Response{
+		Response{
 			StatusCode:    200,
 			StatusMessage: "OK",
 			Header: Header{
@@ -109,9 +109,10 @@ var casesResponse = []struct {
 }
 
 func TestResponseRead(t *testing.T) {
+	var res Response
 	for _, c := range casesResponse {
 		t.Run(c.name, func(t *testing.T) {
-			res, err := ReadResponse(bufio.NewReader(bytes.NewBuffer(c.byts)))
+			err := res.Read(bufio.NewReader(bytes.NewBuffer(c.byts)))
 			require.NoError(t, err)
 			require.Equal(t, c.res, res)
 		})

base/utils.go

@@ -3,8 +3,6 @@ package base
 import (
 	"bufio"
 	"fmt"
-	"io"
-	"strconv"
 )
 
 const (
@@ -38,40 +36,3 @@ func readBytesLimited(rb *bufio.Reader, delim byte, n int) ([]byte, error) {
 	}
 	return nil, fmt.Errorf("buffer length exceeds %d", n)
 }
-
-func readContent(rb *bufio.Reader, header Header) ([]byte, error) {
-	cls, ok := header["Content-Length"]
-	if !ok || len(cls) != 1 {
-		return nil, nil
-	}
-
-	cl, err := strconv.ParseInt(cls[0], 10, 64)
-	if err != nil {
-		return nil, fmt.Errorf("invalid Content-Length")
-	}
-
-	if cl > rtspMaxContentLength {
-		return nil, fmt.Errorf("Content-Length exceeds %d", rtspMaxContentLength)
-	}
-
-	ret := make([]byte, cl)
-	n, err := io.ReadFull(rb, ret)
-	if err != nil && n != len(ret) {
-		return nil, err
-	}
-
-	return ret, nil
-}
-
-func writeContent(bw *bufio.Writer, content []byte) error {
-	if len(content) == 0 {
-		return nil
-	}
-
-	_, err := bw.Write(content)
-	if err != nil {
-		return err
-	}
-
-	return nil
-}

connclient.go

@@ -184,9 +184,10 @@ func (c *ConnClient) NetConn() net.Conn {
 
 func (c *ConnClient) readFrameTCPOrResponse() (interface{}, error) {
 	frame := c.tcpFrames.next()
+	res := base.Response{}
 
 	c.conf.Conn.SetReadDeadline(time.Now().Add(c.conf.ReadTimeout))
-	return base.ReadInterleavedFrameOrResponse(frame, c.br)
+	return base.ReadInterleavedFrameOrResponse(frame, &res, c.br)
 }
 
 // ReadFrameTCP reads an InterleavedFrame.
@@ -735,7 +736,8 @@ func (c *ConnClient) LoopUDP() error {
 	go func() {
 		for {
 			c.conf.Conn.SetReadDeadline(time.Now().Add(clientUDPKeepalivePeriod + c.conf.ReadTimeout))
-			_, err := base.ReadResponse(c.br)
+			var res base.Response
+			err := res.Read(c.br)
 			if err != nil {
 				readDone <- err
 				return

connserver.go

@@ -73,18 +73,27 @@ func (s *ConnServer) NetConn() net.Conn {
 
 // ReadRequest reads a Request.
 func (s *ConnServer) ReadRequest() (*base.Request, error) {
+	req := &base.Request{}
+
 	s.conf.Conn.SetReadDeadline(time.Time{}) // disable deadline
-	return base.ReadRequest(s.br)
+	err := req.Read(s.br)
+	if err != nil {
+		return nil, err
+	}
+
+	return req, nil
 }
 
 // ReadFrameTCPOrRequest reads an InterleavedFrame or a Request.
 func (s *ConnServer) ReadFrameTCPOrRequest(timeout bool) (interface{}, error) {
+	frame := s.tcpFrames.next()
+	req := base.Request{}
+
 	if timeout {
 		s.conf.Conn.SetReadDeadline(time.Now().Add(s.conf.ReadTimeout))
 	}
 
-	frame := s.tcpFrames.next()
-	return base.ReadInterleavedFrameOrRequest(frame, s.br)
+	return base.ReadInterleavedFrameOrRequest(frame, &req, s.br)
 }
 
 // WriteResponse writes a Response.