This update provides:
1) workaround around the build failures. In
summary, it forces the download of some packages during the build
process.
2) update the set of packages that should go inside the vendor
directory
3) Update the dockerfile to use go 1.10
Change-Id: I2bfd090ce0f25b0c10aa214755ae2da7e5384d60
diff --git a/vendor/github.com/gorilla/websocket/conn.go b/vendor/github.com/gorilla/websocket/conn.go
new file mode 100644
index 0000000..d2a21c1
--- /dev/null
+++ b/vendor/github.com/gorilla/websocket/conn.go
@@ -0,0 +1,1165 @@
+// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package websocket
+
+import (
+ "bufio"
+ "encoding/binary"
+ "errors"
+ "io"
+ "io/ioutil"
+ "math/rand"
+ "net"
+ "strconv"
+ "sync"
+ "time"
+ "unicode/utf8"
+)
+
+const (
+ // Frame header byte 0 bits from Section 5.2 of RFC 6455
+ finalBit = 1 << 7
+ rsv1Bit = 1 << 6
+ rsv2Bit = 1 << 5
+ rsv3Bit = 1 << 4
+
+ // Frame header byte 1 bits from Section 5.2 of RFC 6455
+ maskBit = 1 << 7
+
+ maxFrameHeaderSize = 2 + 8 + 4 // Fixed header + length + mask
+ maxControlFramePayloadSize = 125
+
+ writeWait = time.Second
+
+ defaultReadBufferSize = 4096
+ defaultWriteBufferSize = 4096
+
+ continuationFrame = 0
+ noFrame = -1
+)
+
+// Close codes defined in RFC 6455, section 11.7.
+const (
+ CloseNormalClosure = 1000
+ CloseGoingAway = 1001
+ CloseProtocolError = 1002
+ CloseUnsupportedData = 1003
+ CloseNoStatusReceived = 1005
+ CloseAbnormalClosure = 1006
+ CloseInvalidFramePayloadData = 1007
+ ClosePolicyViolation = 1008
+ CloseMessageTooBig = 1009
+ CloseMandatoryExtension = 1010
+ CloseInternalServerErr = 1011
+ CloseServiceRestart = 1012
+ CloseTryAgainLater = 1013
+ CloseTLSHandshake = 1015
+)
+
+// The message types are defined in RFC 6455, section 11.8.
+const (
+ // TextMessage denotes a text data message. The text message payload is
+ // interpreted as UTF-8 encoded text data.
+ TextMessage = 1
+
+ // BinaryMessage denotes a binary data message.
+ BinaryMessage = 2
+
+ // CloseMessage denotes a close control message. The optional message
+ // payload contains a numeric code and text. Use the FormatCloseMessage
+ // function to format a close message payload.
+ CloseMessage = 8
+
+ // PingMessage denotes a ping control message. The optional message payload
+ // is UTF-8 encoded text.
+ PingMessage = 9
+
+ // PongMessage denotes a pong control message. The optional message payload
+ // is UTF-8 encoded text.
+ PongMessage = 10
+)
+
+// ErrCloseSent is returned when the application writes a message to the
+// connection after sending a close message.
+var ErrCloseSent = errors.New("websocket: close sent")
+
+// ErrReadLimit is returned when reading a message that is larger than the
+// read limit set for the connection.
+var ErrReadLimit = errors.New("websocket: read limit exceeded")
+
+// netError satisfies the net Error interface.
+type netError struct {
+ msg string
+ temporary bool
+ timeout bool
+}
+
+func (e *netError) Error() string { return e.msg }
+func (e *netError) Temporary() bool { return e.temporary }
+func (e *netError) Timeout() bool { return e.timeout }
+
+// CloseError represents a close message.
+type CloseError struct {
+ // Code is defined in RFC 6455, section 11.7.
+ Code int
+
+ // Text is the optional text payload.
+ Text string
+}
+
+func (e *CloseError) Error() string {
+ s := []byte("websocket: close ")
+ s = strconv.AppendInt(s, int64(e.Code), 10)
+ switch e.Code {
+ case CloseNormalClosure:
+ s = append(s, " (normal)"...)
+ case CloseGoingAway:
+ s = append(s, " (going away)"...)
+ case CloseProtocolError:
+ s = append(s, " (protocol error)"...)
+ case CloseUnsupportedData:
+ s = append(s, " (unsupported data)"...)
+ case CloseNoStatusReceived:
+ s = append(s, " (no status)"...)
+ case CloseAbnormalClosure:
+ s = append(s, " (abnormal closure)"...)
+ case CloseInvalidFramePayloadData:
+ s = append(s, " (invalid payload data)"...)
+ case ClosePolicyViolation:
+ s = append(s, " (policy violation)"...)
+ case CloseMessageTooBig:
+ s = append(s, " (message too big)"...)
+ case CloseMandatoryExtension:
+ s = append(s, " (mandatory extension missing)"...)
+ case CloseInternalServerErr:
+ s = append(s, " (internal server error)"...)
+ case CloseTLSHandshake:
+ s = append(s, " (TLS handshake error)"...)
+ }
+ if e.Text != "" {
+ s = append(s, ": "...)
+ s = append(s, e.Text...)
+ }
+ return string(s)
+}
+
+// IsCloseError returns boolean indicating whether the error is a *CloseError
+// with one of the specified codes.
+func IsCloseError(err error, codes ...int) bool {
+ if e, ok := err.(*CloseError); ok {
+ for _, code := range codes {
+ if e.Code == code {
+ return true
+ }
+ }
+ }
+ return false
+}
+
+// IsUnexpectedCloseError returns boolean indicating whether the error is a
+// *CloseError with a code not in the list of expected codes.
+func IsUnexpectedCloseError(err error, expectedCodes ...int) bool {
+ if e, ok := err.(*CloseError); ok {
+ for _, code := range expectedCodes {
+ if e.Code == code {
+ return false
+ }
+ }
+ return true
+ }
+ return false
+}
+
+var (
+ errWriteTimeout = &netError{msg: "websocket: write timeout", timeout: true, temporary: true}
+ errUnexpectedEOF = &CloseError{Code: CloseAbnormalClosure, Text: io.ErrUnexpectedEOF.Error()}
+ errBadWriteOpCode = errors.New("websocket: bad write message type")
+ errWriteClosed = errors.New("websocket: write closed")
+ errInvalidControlFrame = errors.New("websocket: invalid control frame")
+)
+
+func newMaskKey() [4]byte {
+ n := rand.Uint32()
+ return [4]byte{byte(n), byte(n >> 8), byte(n >> 16), byte(n >> 24)}
+}
+
+func hideTempErr(err error) error {
+ if e, ok := err.(net.Error); ok && e.Temporary() {
+ err = &netError{msg: e.Error(), timeout: e.Timeout()}
+ }
+ return err
+}
+
+func isControl(frameType int) bool {
+ return frameType == CloseMessage || frameType == PingMessage || frameType == PongMessage
+}
+
+func isData(frameType int) bool {
+ return frameType == TextMessage || frameType == BinaryMessage
+}
+
+var validReceivedCloseCodes = map[int]bool{
+ // see http://www.iana.org/assignments/websocket/websocket.xhtml#close-code-number
+
+ CloseNormalClosure: true,
+ CloseGoingAway: true,
+ CloseProtocolError: true,
+ CloseUnsupportedData: true,
+ CloseNoStatusReceived: false,
+ CloseAbnormalClosure: false,
+ CloseInvalidFramePayloadData: true,
+ ClosePolicyViolation: true,
+ CloseMessageTooBig: true,
+ CloseMandatoryExtension: true,
+ CloseInternalServerErr: true,
+ CloseServiceRestart: true,
+ CloseTryAgainLater: true,
+ CloseTLSHandshake: false,
+}
+
+func isValidReceivedCloseCode(code int) bool {
+ return validReceivedCloseCodes[code] || (code >= 3000 && code <= 4999)
+}
+
+// BufferPool represents a pool of buffers. The *sync.Pool type satisfies this
+// interface. The type of the value stored in a pool is not specified.
+type BufferPool interface {
+ // Get gets a value from the pool or returns nil if the pool is empty.
+ Get() interface{}
+ // Put adds a value to the pool.
+ Put(interface{})
+}
+
+// writePoolData is the type added to the write buffer pool. This wrapper is
+// used to prevent applications from peeking at and depending on the values
+// added to the pool.
+type writePoolData struct{ buf []byte }
+
+// The Conn type represents a WebSocket connection.
+type Conn struct {
+ conn net.Conn
+ isServer bool
+ subprotocol string
+
+ // Write fields
+ mu chan bool // used as mutex to protect write to conn
+ writeBuf []byte // frame is constructed in this buffer.
+ writePool BufferPool
+ writeBufSize int
+ writeDeadline time.Time
+ writer io.WriteCloser // the current writer returned to the application
+ isWriting bool // for best-effort concurrent write detection
+
+ writeErrMu sync.Mutex
+ writeErr error
+
+ enableWriteCompression bool
+ compressionLevel int
+ newCompressionWriter func(io.WriteCloser, int) io.WriteCloser
+
+ // Read fields
+ reader io.ReadCloser // the current reader returned to the application
+ readErr error
+ br *bufio.Reader
+ readRemaining int64 // bytes remaining in current frame.
+ readFinal bool // true the current message has more frames.
+ readLength int64 // Message size.
+ readLimit int64 // Maximum message size.
+ readMaskPos int
+ readMaskKey [4]byte
+ handlePong func(string) error
+ handlePing func(string) error
+ handleClose func(int, string) error
+ readErrCount int
+ messageReader *messageReader // the current low-level reader
+
+ readDecompress bool // whether last read frame had RSV1 set
+ newDecompressionReader func(io.Reader) io.ReadCloser
+}
+
+func newConn(conn net.Conn, isServer bool, readBufferSize, writeBufferSize int, writeBufferPool BufferPool, br *bufio.Reader, writeBuf []byte) *Conn {
+
+ if br == nil {
+ if readBufferSize == 0 {
+ readBufferSize = defaultReadBufferSize
+ } else if readBufferSize < maxControlFramePayloadSize {
+ // must be large enough for control frame
+ readBufferSize = maxControlFramePayloadSize
+ }
+ br = bufio.NewReaderSize(conn, readBufferSize)
+ }
+
+ if writeBufferSize <= 0 {
+ writeBufferSize = defaultWriteBufferSize
+ }
+ writeBufferSize += maxFrameHeaderSize
+
+ if writeBuf == nil && writeBufferPool == nil {
+ writeBuf = make([]byte, writeBufferSize)
+ }
+
+ mu := make(chan bool, 1)
+ mu <- true
+ c := &Conn{
+ isServer: isServer,
+ br: br,
+ conn: conn,
+ mu: mu,
+ readFinal: true,
+ writeBuf: writeBuf,
+ writePool: writeBufferPool,
+ writeBufSize: writeBufferSize,
+ enableWriteCompression: true,
+ compressionLevel: defaultCompressionLevel,
+ }
+ c.SetCloseHandler(nil)
+ c.SetPingHandler(nil)
+ c.SetPongHandler(nil)
+ return c
+}
+
+// Subprotocol returns the negotiated protocol for the connection.
+func (c *Conn) Subprotocol() string {
+ return c.subprotocol
+}
+
+// Close closes the underlying network connection without sending or waiting
+// for a close message.
+func (c *Conn) Close() error {
+ return c.conn.Close()
+}
+
+// LocalAddr returns the local network address.
+func (c *Conn) LocalAddr() net.Addr {
+ return c.conn.LocalAddr()
+}
+
+// RemoteAddr returns the remote network address.
+func (c *Conn) RemoteAddr() net.Addr {
+ return c.conn.RemoteAddr()
+}
+
+// Write methods
+
+func (c *Conn) writeFatal(err error) error {
+ err = hideTempErr(err)
+ c.writeErrMu.Lock()
+ if c.writeErr == nil {
+ c.writeErr = err
+ }
+ c.writeErrMu.Unlock()
+ return err
+}
+
+func (c *Conn) read(n int) ([]byte, error) {
+ p, err := c.br.Peek(n)
+ if err == io.EOF {
+ err = errUnexpectedEOF
+ }
+ c.br.Discard(len(p))
+ return p, err
+}
+
+func (c *Conn) write(frameType int, deadline time.Time, buf0, buf1 []byte) error {
+ <-c.mu
+ defer func() { c.mu <- true }()
+
+ c.writeErrMu.Lock()
+ err := c.writeErr
+ c.writeErrMu.Unlock()
+ if err != nil {
+ return err
+ }
+
+ c.conn.SetWriteDeadline(deadline)
+ if len(buf1) == 0 {
+ _, err = c.conn.Write(buf0)
+ } else {
+ err = c.writeBufs(buf0, buf1)
+ }
+ if err != nil {
+ return c.writeFatal(err)
+ }
+ if frameType == CloseMessage {
+ c.writeFatal(ErrCloseSent)
+ }
+ return nil
+}
+
+// WriteControl writes a control message with the given deadline. The allowed
+// message types are CloseMessage, PingMessage and PongMessage.
+func (c *Conn) WriteControl(messageType int, data []byte, deadline time.Time) error {
+ if !isControl(messageType) {
+ return errBadWriteOpCode
+ }
+ if len(data) > maxControlFramePayloadSize {
+ return errInvalidControlFrame
+ }
+
+ b0 := byte(messageType) | finalBit
+ b1 := byte(len(data))
+ if !c.isServer {
+ b1 |= maskBit
+ }
+
+ buf := make([]byte, 0, maxFrameHeaderSize+maxControlFramePayloadSize)
+ buf = append(buf, b0, b1)
+
+ if c.isServer {
+ buf = append(buf, data...)
+ } else {
+ key := newMaskKey()
+ buf = append(buf, key[:]...)
+ buf = append(buf, data...)
+ maskBytes(key, 0, buf[6:])
+ }
+
+ d := time.Hour * 1000
+ if !deadline.IsZero() {
+ d = deadline.Sub(time.Now())
+ if d < 0 {
+ return errWriteTimeout
+ }
+ }
+
+ timer := time.NewTimer(d)
+ select {
+ case <-c.mu:
+ timer.Stop()
+ case <-timer.C:
+ return errWriteTimeout
+ }
+ defer func() { c.mu <- true }()
+
+ c.writeErrMu.Lock()
+ err := c.writeErr
+ c.writeErrMu.Unlock()
+ if err != nil {
+ return err
+ }
+
+ c.conn.SetWriteDeadline(deadline)
+ _, err = c.conn.Write(buf)
+ if err != nil {
+ return c.writeFatal(err)
+ }
+ if messageType == CloseMessage {
+ c.writeFatal(ErrCloseSent)
+ }
+ return err
+}
+
+func (c *Conn) prepWrite(messageType int) error {
+ // Close previous writer if not already closed by the application. It's
+ // probably better to return an error in this situation, but we cannot
+ // change this without breaking existing applications.
+ if c.writer != nil {
+ c.writer.Close()
+ c.writer = nil
+ }
+
+ if !isControl(messageType) && !isData(messageType) {
+ return errBadWriteOpCode
+ }
+
+ c.writeErrMu.Lock()
+ err := c.writeErr
+ c.writeErrMu.Unlock()
+ if err != nil {
+ return err
+ }
+
+ if c.writeBuf == nil {
+ wpd, ok := c.writePool.Get().(writePoolData)
+ if ok {
+ c.writeBuf = wpd.buf
+ } else {
+ c.writeBuf = make([]byte, c.writeBufSize)
+ }
+ }
+ return nil
+}
+
+// NextWriter returns a writer for the next message to send. The writer's Close
+// method flushes the complete message to the network.
+//
+// There can be at most one open writer on a connection. NextWriter closes the
+// previous writer if the application has not already done so.
+//
+// All message types (TextMessage, BinaryMessage, CloseMessage, PingMessage and
+// PongMessage) are supported.
+func (c *Conn) NextWriter(messageType int) (io.WriteCloser, error) {
+ if err := c.prepWrite(messageType); err != nil {
+ return nil, err
+ }
+
+ mw := &messageWriter{
+ c: c,
+ frameType: messageType,
+ pos: maxFrameHeaderSize,
+ }
+ c.writer = mw
+ if c.newCompressionWriter != nil && c.enableWriteCompression && isData(messageType) {
+ w := c.newCompressionWriter(c.writer, c.compressionLevel)
+ mw.compress = true
+ c.writer = w
+ }
+ return c.writer, nil
+}
+
+type messageWriter struct {
+ c *Conn
+ compress bool // whether next call to flushFrame should set RSV1
+ pos int // end of data in writeBuf.
+ frameType int // type of the current frame.
+ err error
+}
+
+func (w *messageWriter) fatal(err error) error {
+ if w.err != nil {
+ w.err = err
+ w.c.writer = nil
+ }
+ return err
+}
+
+// flushFrame writes buffered data and extra as a frame to the network. The
+// final argument indicates that this is the last frame in the message.
+func (w *messageWriter) flushFrame(final bool, extra []byte) error {
+ c := w.c
+ length := w.pos - maxFrameHeaderSize + len(extra)
+
+ // Check for invalid control frames.
+ if isControl(w.frameType) &&
+ (!final || length > maxControlFramePayloadSize) {
+ return w.fatal(errInvalidControlFrame)
+ }
+
+ b0 := byte(w.frameType)
+ if final {
+ b0 |= finalBit
+ }
+ if w.compress {
+ b0 |= rsv1Bit
+ }
+ w.compress = false
+
+ b1 := byte(0)
+ if !c.isServer {
+ b1 |= maskBit
+ }
+
+ // Assume that the frame starts at beginning of c.writeBuf.
+ framePos := 0
+ if c.isServer {
+ // Adjust up if mask not included in the header.
+ framePos = 4
+ }
+
+ switch {
+ case length >= 65536:
+ c.writeBuf[framePos] = b0
+ c.writeBuf[framePos+1] = b1 | 127
+ binary.BigEndian.PutUint64(c.writeBuf[framePos+2:], uint64(length))
+ case length > 125:
+ framePos += 6
+ c.writeBuf[framePos] = b0
+ c.writeBuf[framePos+1] = b1 | 126
+ binary.BigEndian.PutUint16(c.writeBuf[framePos+2:], uint16(length))
+ default:
+ framePos += 8
+ c.writeBuf[framePos] = b0
+ c.writeBuf[framePos+1] = b1 | byte(length)
+ }
+
+ if !c.isServer {
+ key := newMaskKey()
+ copy(c.writeBuf[maxFrameHeaderSize-4:], key[:])
+ maskBytes(key, 0, c.writeBuf[maxFrameHeaderSize:w.pos])
+ if len(extra) > 0 {
+ return c.writeFatal(errors.New("websocket: internal error, extra used in client mode"))
+ }
+ }
+
+ // Write the buffers to the connection with best-effort detection of
+ // concurrent writes. See the concurrency section in the package
+ // documentation for more info.
+
+ if c.isWriting {
+ panic("concurrent write to websocket connection")
+ }
+ c.isWriting = true
+
+ err := c.write(w.frameType, c.writeDeadline, c.writeBuf[framePos:w.pos], extra)
+
+ if !c.isWriting {
+ panic("concurrent write to websocket connection")
+ }
+ c.isWriting = false
+
+ if err != nil {
+ return w.fatal(err)
+ }
+
+ if final {
+ c.writer = nil
+ if c.writePool != nil {
+ c.writePool.Put(writePoolData{buf: c.writeBuf})
+ c.writeBuf = nil
+ }
+ return nil
+ }
+
+ // Setup for next frame.
+ w.pos = maxFrameHeaderSize
+ w.frameType = continuationFrame
+ return nil
+}
+
+func (w *messageWriter) ncopy(max int) (int, error) {
+ n := len(w.c.writeBuf) - w.pos
+ if n <= 0 {
+ if err := w.flushFrame(false, nil); err != nil {
+ return 0, err
+ }
+ n = len(w.c.writeBuf) - w.pos
+ }
+ if n > max {
+ n = max
+ }
+ return n, nil
+}
+
+func (w *messageWriter) Write(p []byte) (int, error) {
+ if w.err != nil {
+ return 0, w.err
+ }
+
+ if len(p) > 2*len(w.c.writeBuf) && w.c.isServer {
+ // Don't buffer large messages.
+ err := w.flushFrame(false, p)
+ if err != nil {
+ return 0, err
+ }
+ return len(p), nil
+ }
+
+ nn := len(p)
+ for len(p) > 0 {
+ n, err := w.ncopy(len(p))
+ if err != nil {
+ return 0, err
+ }
+ copy(w.c.writeBuf[w.pos:], p[:n])
+ w.pos += n
+ p = p[n:]
+ }
+ return nn, nil
+}
+
+func (w *messageWriter) WriteString(p string) (int, error) {
+ if w.err != nil {
+ return 0, w.err
+ }
+
+ nn := len(p)
+ for len(p) > 0 {
+ n, err := w.ncopy(len(p))
+ if err != nil {
+ return 0, err
+ }
+ copy(w.c.writeBuf[w.pos:], p[:n])
+ w.pos += n
+ p = p[n:]
+ }
+ return nn, nil
+}
+
+func (w *messageWriter) ReadFrom(r io.Reader) (nn int64, err error) {
+ if w.err != nil {
+ return 0, w.err
+ }
+ for {
+ if w.pos == len(w.c.writeBuf) {
+ err = w.flushFrame(false, nil)
+ if err != nil {
+ break
+ }
+ }
+ var n int
+ n, err = r.Read(w.c.writeBuf[w.pos:])
+ w.pos += n
+ nn += int64(n)
+ if err != nil {
+ if err == io.EOF {
+ err = nil
+ }
+ break
+ }
+ }
+ return nn, err
+}
+
+func (w *messageWriter) Close() error {
+ if w.err != nil {
+ return w.err
+ }
+ if err := w.flushFrame(true, nil); err != nil {
+ return err
+ }
+ w.err = errWriteClosed
+ return nil
+}
+
+// WritePreparedMessage writes prepared message into connection.
+func (c *Conn) WritePreparedMessage(pm *PreparedMessage) error {
+ frameType, frameData, err := pm.frame(prepareKey{
+ isServer: c.isServer,
+ compress: c.newCompressionWriter != nil && c.enableWriteCompression && isData(pm.messageType),
+ compressionLevel: c.compressionLevel,
+ })
+ if err != nil {
+ return err
+ }
+ if c.isWriting {
+ panic("concurrent write to websocket connection")
+ }
+ c.isWriting = true
+ err = c.write(frameType, c.writeDeadline, frameData, nil)
+ if !c.isWriting {
+ panic("concurrent write to websocket connection")
+ }
+ c.isWriting = false
+ return err
+}
+
+// WriteMessage is a helper method for getting a writer using NextWriter,
+// writing the message and closing the writer.
+func (c *Conn) WriteMessage(messageType int, data []byte) error {
+
+ if c.isServer && (c.newCompressionWriter == nil || !c.enableWriteCompression) {
+ // Fast path with no allocations and single frame.
+
+ if err := c.prepWrite(messageType); err != nil {
+ return err
+ }
+ mw := messageWriter{c: c, frameType: messageType, pos: maxFrameHeaderSize}
+ n := copy(c.writeBuf[mw.pos:], data)
+ mw.pos += n
+ data = data[n:]
+ return mw.flushFrame(true, data)
+ }
+
+ w, err := c.NextWriter(messageType)
+ if err != nil {
+ return err
+ }
+ if _, err = w.Write(data); err != nil {
+ return err
+ }
+ return w.Close()
+}
+
+// SetWriteDeadline sets the write deadline on the underlying network
+// connection. After a write has timed out, the websocket state is corrupt and
+// all future writes will return an error. A zero value for t means writes will
+// not time out.
+func (c *Conn) SetWriteDeadline(t time.Time) error {
+ c.writeDeadline = t
+ return nil
+}
+
+// Read methods
+
+func (c *Conn) advanceFrame() (int, error) {
+ // 1. Skip remainder of previous frame.
+
+ if c.readRemaining > 0 {
+ if _, err := io.CopyN(ioutil.Discard, c.br, c.readRemaining); err != nil {
+ return noFrame, err
+ }
+ }
+
+ // 2. Read and parse first two bytes of frame header.
+
+ p, err := c.read(2)
+ if err != nil {
+ return noFrame, err
+ }
+
+ final := p[0]&finalBit != 0
+ frameType := int(p[0] & 0xf)
+ mask := p[1]&maskBit != 0
+ c.readRemaining = int64(p[1] & 0x7f)
+
+ c.readDecompress = false
+ if c.newDecompressionReader != nil && (p[0]&rsv1Bit) != 0 {
+ c.readDecompress = true
+ p[0] &^= rsv1Bit
+ }
+
+ if rsv := p[0] & (rsv1Bit | rsv2Bit | rsv3Bit); rsv != 0 {
+ return noFrame, c.handleProtocolError("unexpected reserved bits 0x" + strconv.FormatInt(int64(rsv), 16))
+ }
+
+ switch frameType {
+ case CloseMessage, PingMessage, PongMessage:
+ if c.readRemaining > maxControlFramePayloadSize {
+ return noFrame, c.handleProtocolError("control frame length > 125")
+ }
+ if !final {
+ return noFrame, c.handleProtocolError("control frame not final")
+ }
+ case TextMessage, BinaryMessage:
+ if !c.readFinal {
+ return noFrame, c.handleProtocolError("message start before final message frame")
+ }
+ c.readFinal = final
+ case continuationFrame:
+ if c.readFinal {
+ return noFrame, c.handleProtocolError("continuation after final message frame")
+ }
+ c.readFinal = final
+ default:
+ return noFrame, c.handleProtocolError("unknown opcode " + strconv.Itoa(frameType))
+ }
+
+ // 3. Read and parse frame length.
+
+ switch c.readRemaining {
+ case 126:
+ p, err := c.read(2)
+ if err != nil {
+ return noFrame, err
+ }
+ c.readRemaining = int64(binary.BigEndian.Uint16(p))
+ case 127:
+ p, err := c.read(8)
+ if err != nil {
+ return noFrame, err
+ }
+ c.readRemaining = int64(binary.BigEndian.Uint64(p))
+ }
+
+ // 4. Handle frame masking.
+
+ if mask != c.isServer {
+ return noFrame, c.handleProtocolError("incorrect mask flag")
+ }
+
+ if mask {
+ c.readMaskPos = 0
+ p, err := c.read(len(c.readMaskKey))
+ if err != nil {
+ return noFrame, err
+ }
+ copy(c.readMaskKey[:], p)
+ }
+
+ // 5. For text and binary messages, enforce read limit and return.
+
+ if frameType == continuationFrame || frameType == TextMessage || frameType == BinaryMessage {
+
+ c.readLength += c.readRemaining
+ if c.readLimit > 0 && c.readLength > c.readLimit {
+ c.WriteControl(CloseMessage, FormatCloseMessage(CloseMessageTooBig, ""), time.Now().Add(writeWait))
+ return noFrame, ErrReadLimit
+ }
+
+ return frameType, nil
+ }
+
+ // 6. Read control frame payload.
+
+ var payload []byte
+ if c.readRemaining > 0 {
+ payload, err = c.read(int(c.readRemaining))
+ c.readRemaining = 0
+ if err != nil {
+ return noFrame, err
+ }
+ if c.isServer {
+ maskBytes(c.readMaskKey, 0, payload)
+ }
+ }
+
+ // 7. Process control frame payload.
+
+ switch frameType {
+ case PongMessage:
+ if err := c.handlePong(string(payload)); err != nil {
+ return noFrame, err
+ }
+ case PingMessage:
+ if err := c.handlePing(string(payload)); err != nil {
+ return noFrame, err
+ }
+ case CloseMessage:
+ closeCode := CloseNoStatusReceived
+ closeText := ""
+ if len(payload) >= 2 {
+ closeCode = int(binary.BigEndian.Uint16(payload))
+ if !isValidReceivedCloseCode(closeCode) {
+ return noFrame, c.handleProtocolError("invalid close code")
+ }
+ closeText = string(payload[2:])
+ if !utf8.ValidString(closeText) {
+ return noFrame, c.handleProtocolError("invalid utf8 payload in close frame")
+ }
+ }
+ if err := c.handleClose(closeCode, closeText); err != nil {
+ return noFrame, err
+ }
+ return noFrame, &CloseError{Code: closeCode, Text: closeText}
+ }
+
+ return frameType, nil
+}
+
+func (c *Conn) handleProtocolError(message string) error {
+ c.WriteControl(CloseMessage, FormatCloseMessage(CloseProtocolError, message), time.Now().Add(writeWait))
+ return errors.New("websocket: " + message)
+}
+
+// NextReader returns the next data message received from the peer. The
+// returned messageType is either TextMessage or BinaryMessage.
+//
+// There can be at most one open reader on a connection. NextReader discards
+// the previous message if the application has not already consumed it.
+//
+// Applications must break out of the application's read loop when this method
+// returns a non-nil error value. Errors returned from this method are
+// permanent. Once this method returns a non-nil error, all subsequent calls to
+// this method return the same error.
+func (c *Conn) NextReader() (messageType int, r io.Reader, err error) {
+ // Close previous reader, only relevant for decompression.
+ if c.reader != nil {
+ c.reader.Close()
+ c.reader = nil
+ }
+
+ c.messageReader = nil
+ c.readLength = 0
+
+ for c.readErr == nil {
+ frameType, err := c.advanceFrame()
+ if err != nil {
+ c.readErr = hideTempErr(err)
+ break
+ }
+ if frameType == TextMessage || frameType == BinaryMessage {
+ c.messageReader = &messageReader{c}
+ c.reader = c.messageReader
+ if c.readDecompress {
+ c.reader = c.newDecompressionReader(c.reader)
+ }
+ return frameType, c.reader, nil
+ }
+ }
+
+ // Applications that do handle the error returned from this method spin in
+ // tight loop on connection failure. To help application developers detect
+ // this error, panic on repeated reads to the failed connection.
+ c.readErrCount++
+ if c.readErrCount >= 1000 {
+ panic("repeated read on failed websocket connection")
+ }
+
+ return noFrame, nil, c.readErr
+}
+
+type messageReader struct{ c *Conn }
+
+func (r *messageReader) Read(b []byte) (int, error) {
+ c := r.c
+ if c.messageReader != r {
+ return 0, io.EOF
+ }
+
+ for c.readErr == nil {
+
+ if c.readRemaining > 0 {
+ if int64(len(b)) > c.readRemaining {
+ b = b[:c.readRemaining]
+ }
+ n, err := c.br.Read(b)
+ c.readErr = hideTempErr(err)
+ if c.isServer {
+ c.readMaskPos = maskBytes(c.readMaskKey, c.readMaskPos, b[:n])
+ }
+ c.readRemaining -= int64(n)
+ if c.readRemaining > 0 && c.readErr == io.EOF {
+ c.readErr = errUnexpectedEOF
+ }
+ return n, c.readErr
+ }
+
+ if c.readFinal {
+ c.messageReader = nil
+ return 0, io.EOF
+ }
+
+ frameType, err := c.advanceFrame()
+ switch {
+ case err != nil:
+ c.readErr = hideTempErr(err)
+ case frameType == TextMessage || frameType == BinaryMessage:
+ c.readErr = errors.New("websocket: internal error, unexpected text or binary in Reader")
+ }
+ }
+
+ err := c.readErr
+ if err == io.EOF && c.messageReader == r {
+ err = errUnexpectedEOF
+ }
+ return 0, err
+}
+
+func (r *messageReader) Close() error {
+ return nil
+}
+
+// ReadMessage is a helper method for getting a reader using NextReader and
+// reading from that reader to a buffer.
+func (c *Conn) ReadMessage() (messageType int, p []byte, err error) {
+ var r io.Reader
+ messageType, r, err = c.NextReader()
+ if err != nil {
+ return messageType, nil, err
+ }
+ p, err = ioutil.ReadAll(r)
+ return messageType, p, err
+}
+
+// SetReadDeadline sets the read deadline on the underlying network connection.
+// After a read has timed out, the websocket connection state is corrupt and
+// all future reads will return an error. A zero value for t means reads will
+// not time out.
+func (c *Conn) SetReadDeadline(t time.Time) error {
+ return c.conn.SetReadDeadline(t)
+}
+
+// SetReadLimit sets the maximum size for a message read from the peer. If a
+// message exceeds the limit, the connection sends a close message to the peer
+// and returns ErrReadLimit to the application.
+func (c *Conn) SetReadLimit(limit int64) {
+ c.readLimit = limit
+}
+
+// CloseHandler returns the current close handler
+func (c *Conn) CloseHandler() func(code int, text string) error {
+ return c.handleClose
+}
+
+// SetCloseHandler sets the handler for close messages received from the peer.
+// The code argument to h is the received close code or CloseNoStatusReceived
+// if the close message is empty. The default close handler sends a close
+// message back to the peer.
+//
+// The handler function is called from the NextReader, ReadMessage and message
+// reader Read methods. The application must read the connection to process
+// close messages as described in the section on Control Messages above.
+//
+// The connection read methods return a CloseError when a close message is
+// received. Most applications should handle close messages as part of their
+// normal error handling. Applications should only set a close handler when the
+// application must perform some action before sending a close message back to
+// the peer.
+func (c *Conn) SetCloseHandler(h func(code int, text string) error) {
+ if h == nil {
+ h = func(code int, text string) error {
+ message := FormatCloseMessage(code, "")
+ c.WriteControl(CloseMessage, message, time.Now().Add(writeWait))
+ return nil
+ }
+ }
+ c.handleClose = h
+}
+
+// PingHandler returns the current ping handler
+func (c *Conn) PingHandler() func(appData string) error {
+ return c.handlePing
+}
+
+// SetPingHandler sets the handler for ping messages received from the peer.
+// The appData argument to h is the PING message application data. The default
+// ping handler sends a pong to the peer.
+//
+// The handler function is called from the NextReader, ReadMessage and message
+// reader Read methods. The application must read the connection to process
+// ping messages as described in the section on Control Messages above.
+func (c *Conn) SetPingHandler(h func(appData string) error) {
+ if h == nil {
+ h = func(message string) error {
+ err := c.WriteControl(PongMessage, []byte(message), time.Now().Add(writeWait))
+ if err == ErrCloseSent {
+ return nil
+ } else if e, ok := err.(net.Error); ok && e.Temporary() {
+ return nil
+ }
+ return err
+ }
+ }
+ c.handlePing = h
+}
+
+// PongHandler returns the current pong handler
+func (c *Conn) PongHandler() func(appData string) error {
+ return c.handlePong
+}
+
+// SetPongHandler sets the handler for pong messages received from the peer.
+// The appData argument to h is the PONG message application data. The default
+// pong handler does nothing.
+//
+// The handler function is called from the NextReader, ReadMessage and message
+// reader Read methods. The application must read the connection to process
+// pong messages as described in the section on Control Messages above.
+func (c *Conn) SetPongHandler(h func(appData string) error) {
+ if h == nil {
+ h = func(string) error { return nil }
+ }
+ c.handlePong = h
+}
+
+// UnderlyingConn returns the internal net.Conn. This can be used to further
+// modifications to connection specific flags.
+func (c *Conn) UnderlyingConn() net.Conn {
+ return c.conn
+}
+
+// EnableWriteCompression enables and disables write compression of
+// subsequent text and binary messages. This function is a noop if
+// compression was not negotiated with the peer.
+func (c *Conn) EnableWriteCompression(enable bool) {
+ c.enableWriteCompression = enable
+}
+
+// SetCompressionLevel sets the flate compression level for subsequent text and
+// binary messages. This function is a noop if compression was not negotiated
+// with the peer. See the compress/flate package for a description of
+// compression levels.
+func (c *Conn) SetCompressionLevel(level int) error {
+ if !isValidCompressionLevel(level) {
+ return errors.New("websocket: invalid compression level")
+ }
+ c.compressionLevel = level
+ return nil
+}
+
+// FormatCloseMessage formats closeCode and text as a WebSocket close message.
+// An empty message is returned for code CloseNoStatusReceived.
+func FormatCloseMessage(closeCode int, text string) []byte {
+ if closeCode == CloseNoStatusReceived {
+ // Return empty message because it's illegal to send
+ // CloseNoStatusReceived. Return non-nil value in case application
+ // checks for nil.
+ return []byte{}
+ }
+ buf := make([]byte, 2+len(text))
+ binary.BigEndian.PutUint16(buf, uint16(closeCode))
+ copy(buf[2:], text)
+ return buf
+}