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conn.go
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conn.go
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// Copyright 2013, zhangpeihao All rights reserved.
package gortmp
import (
"bufio"
"bytes"
"encoding/binary"
"errors"
"github.com/zhangpeihao/goamf"
"github.com/zhangpeihao/log"
"io"
"net"
"sync"
"sync/atomic"
"time"
)
// Conn
//
// Common connection functions
type Conn interface {
Close()
Send(message *Message) error
CreateChunkStream(ID uint32) (*OutboundChunkStream, error)
CloseChunkStream(ID uint32)
NewTransactionID() uint32
CreateMediaChunkStream() (*OutboundChunkStream, error)
CloseMediaChunkStream(id uint32)
SetStreamBufferSize(streamId uint32, size uint32)
OutboundChunkStream(id uint32) (chunkStream *OutboundChunkStream, found bool)
InboundChunkStream(id uint32) (chunkStream *InboundChunkStream, found bool)
SetWindowAcknowledgementSize()
SetPeerBandwidth(peerBandwidth uint32, limitType byte)
SetChunkSize(chunkSize uint32)
SendUserControlMessage(eventId uint16)
}
// Connection handler
type ConnHandler interface {
// Received message
OnReceived(conn Conn, message *Message)
// Received command
OnReceivedRtmpCommand(conn Conn, command *Command)
// Connection closed
OnClosed(conn Conn)
}
// conn
//
// To maintain all chunk streams in one network connection.
type conn struct {
// Chunk streams
outChunkStreams map[uint32]*OutboundChunkStream
inChunkStreams map[uint32]*InboundChunkStream
// High-priority send message buffer.
// Protocol control messages are sent with highest priority.
highPriorityMessageQueue chan *Message
highPriorityMessage *Message
highPriorityMessageOffset int
// Middle-priority send message buffer.
middlePriorityMessageQueue chan *Message
middlePriorityMessage *Message
middlePriorityMessageOffset int
// Low-priority send message buffer.
// the video message is assigned the lowest priority.
lowPriorityMessageQueue chan *Message
lowPriorityMessage *Message
lowPriorityMessageOffset int
// Chunk size
inChunkSize uint32
outChunkSize uint32
outChunkSizeTemp uint32
// Bytes counter(For window ack)
inBytes uint32
outBytes uint32
// Previous window acknowledgement inbytes
inBytesPreWindow uint32
// Window size
inWindowSize uint32
outWindowSize uint32
// Bandwidth
inBandwidth uint32
outBandwidth uint32
// Bandwidth Limit
inBandwidthLimit uint8
outBandwidthLimit uint8
// Media chunk stream ID
mediaChunkStreamIDAllocator []bool
mediaChunkStreamIDAllocatorLocker sync.Mutex
// Closed
closed bool
// Handler
handler ConnHandler
// Network connection
c net.Conn
br *bufio.Reader
bw *bufio.Writer
// Last transaction ID
lastTransactionID uint32
// Error
err error
}
// Create new connection
func NewConn(c net.Conn, br *bufio.Reader, bw *bufio.Writer, handler ConnHandler, maxChannelNumber int) Conn {
conn := &conn{
c: c,
br: br,
bw: bw,
outChunkStreams: make(map[uint32]*OutboundChunkStream),
inChunkStreams: make(map[uint32]*InboundChunkStream),
highPriorityMessageQueue: make(chan *Message, DEFAULT_HIGH_PRIORITY_BUFFER_SIZE),
middlePriorityMessageQueue: make(chan *Message, DEFAULT_MIDDLE_PRIORITY_BUFFER_SIZE),
lowPriorityMessageQueue: make(chan *Message, DEFAULT_LOW_PRIORITY_BUFFER_SIZE),
inChunkSize: DEFAULT_CHUNK_SIZE,
outChunkSize: DEFAULT_CHUNK_SIZE,
inWindowSize: DEFAULT_WINDOW_SIZE,
outWindowSize: DEFAULT_WINDOW_SIZE,
inBandwidth: DEFAULT_WINDOW_SIZE,
outBandwidth: DEFAULT_WINDOW_SIZE,
inBandwidthLimit: BINDWIDTH_LIMIT_DYNAMIC,
outBandwidthLimit: BINDWIDTH_LIMIT_DYNAMIC,
handler: handler,
mediaChunkStreamIDAllocator: make([]bool, maxChannelNumber),
}
// Create "Protocol control chunk stream"
conn.outChunkStreams[CS_ID_PROTOCOL_CONTROL] = NewOutboundChunkStream(CS_ID_PROTOCOL_CONTROL)
// Create "Command message chunk stream"
conn.outChunkStreams[CS_ID_COMMAND] = NewOutboundChunkStream(CS_ID_COMMAND)
// Create "User control chunk stream"
conn.outChunkStreams[CS_ID_USER_CONTROL] = NewOutboundChunkStream(CS_ID_USER_CONTROL)
go conn.sendLoop()
go conn.readLoop()
return conn
}
// Send high priority message in continuous chunks
func (conn *conn) sendMessage(message *Message) {
chunkStream, found := conn.outChunkStreams[message.ChunkStreamID]
if !found {
logger.ModulePrintf(logHandler, log.LOG_LEVEL_WARNING,
"Can not found chunk strem id %d", message.ChunkStreamID)
// Error
return
}
// message.Dump(">>>")
header := chunkStream.NewOutboundHeader(message)
_, err := header.Write(conn.bw)
if err != nil {
conn.error(err, "sendMessage write header")
return
}
// header.Dump(">>>")
if header.MessageLength > conn.outChunkSize {
// chunkStream.lastHeader = nil
// Split into some chunk
_, err = CopyNToNetwork(conn.bw, message.Buf, int64(conn.outChunkSize))
if err != nil {
conn.error(err, "sendMessage copy buffer")
return
}
remain := header.MessageLength - conn.outChunkSize
// Type 3 chunk
for {
err = conn.bw.WriteByte(byte(0xc0 | byte(header.ChunkStreamID)))
if err != nil {
conn.error(err, "sendMessage Type 3 chunk header")
return
}
if remain > conn.outChunkSize {
_, err = CopyNToNetwork(conn.bw, message.Buf, int64(conn.outChunkSize))
if err != nil {
conn.error(err, "sendMessage copy split buffer 1")
return
}
remain -= conn.outChunkSize
} else {
_, err = CopyNToNetwork(conn.bw, message.Buf, int64(remain))
if err != nil {
conn.error(err, "sendMessage copy split buffer 2")
return
}
break
}
}
} else {
_, err = CopyNToNetwork(conn.bw, message.Buf, int64(header.MessageLength))
if err != nil {
conn.error(err, "sendMessage copy buffer")
return
}
}
err = FlushToNetwork(conn.bw)
if err != nil {
conn.error(err, "sendMessage Flush 3")
return
}
if message.ChunkStreamID == CS_ID_PROTOCOL_CONTROL &&
message.Type == SET_CHUNK_SIZE &&
conn.outChunkSizeTemp != 0 {
// Set chunk size
conn.outChunkSize = conn.outChunkSizeTemp
conn.outChunkSizeTemp = 0
}
}
func (conn *conn) checkAndSendHighPriorityMessage() {
for len(conn.highPriorityMessageQueue) > 0 {
message := <-conn.highPriorityMessageQueue
conn.sendMessage(message)
}
}
// send loop
func (conn *conn) sendLoop() {
defer func() {
if r := recover(); r != nil {
if conn.err == nil {
conn.err = r.(error)
}
}
conn.Close()
}()
for !conn.closed {
select {
case message := <-conn.highPriorityMessageQueue:
// Send all high priority messages
conn.sendMessage(message)
case message := <-conn.middlePriorityMessageQueue:
// Send one middle priority messages
conn.sendMessage(message)
conn.checkAndSendHighPriorityMessage()
case message := <-conn.lowPriorityMessageQueue:
// Check high priority message queue first
conn.checkAndSendHighPriorityMessage()
conn.sendMessage(message)
case <-time.After(time.Second):
// Check close
}
}
}
// read loop
func (conn *conn) readLoop() {
defer func() {
if r := recover(); r != nil {
if conn.err == nil {
conn.err = r.(error)
logger.ModulePrintf(logHandler, log.LOG_LEVEL_WARNING,
"readLoop panic:", conn.err)
}
}
conn.Close()
conn.handler.OnClosed(conn)
}()
var found bool
var chunkstream *InboundChunkStream
var remain uint32
for !conn.closed {
// Read base header
n, vfmt, csi, err := ReadBaseHeader(conn.br)
CheckError(err, "ReadBaseHeader")
conn.inBytes += uint32(n)
// Get chunk stream
chunkstream, found = conn.inChunkStreams[csi]
if !found || chunkstream == nil {
logger.ModulePrintf(logHandler, log.LOG_LEVEL_TRACE, "New stream 1 csi: %d, fmt: %d\n", csi, vfmt)
chunkstream = NewInboundChunkStream(csi)
conn.inChunkStreams[csi] = chunkstream
}
// Read header
header := &Header{}
n, err = header.ReadHeader(conn.br, vfmt, csi, chunkstream.lastHeader)
CheckError(err, "ReadHeader")
if !found {
logger.ModulePrintf(logHandler, log.LOG_LEVEL_TRACE, "New stream 2 csi: %d, fmt: %d, header: %+v\n", csi, vfmt, header)
}
conn.inBytes += uint32(n)
var absoluteTimestamp uint32
var message *Message
switch vfmt {
case HEADER_FMT_FULL:
chunkstream.lastHeader = header
absoluteTimestamp = header.Timestamp
case HEADER_FMT_SAME_STREAM:
// A new message with same stream ID
if chunkstream.lastHeader == nil {
logger.ModulePrintf(logHandler, log.LOG_LEVEL_WARNING,
"A new message with fmt: %d, csi: %d\n", vfmt, csi)
header.Dump("err")
} else {
header.MessageStreamID = chunkstream.lastHeader.MessageStreamID
}
chunkstream.lastHeader = header
absoluteTimestamp = chunkstream.lastInAbsoluteTimestamp + header.Timestamp
case HEADER_FMT_SAME_LENGTH_AND_STREAM:
// A new message with same stream ID, message length and message type
if chunkstream.lastHeader == nil {
logger.ModulePrintf(logHandler, log.LOG_LEVEL_WARNING,
"A new message with fmt: %d, csi: %d\n", vfmt, csi)
header.Dump("err")
}
header.MessageStreamID = chunkstream.lastHeader.MessageStreamID
header.MessageLength = chunkstream.lastHeader.MessageLength
header.MessageTypeID = chunkstream.lastHeader.MessageTypeID
chunkstream.lastHeader = header
absoluteTimestamp = chunkstream.lastInAbsoluteTimestamp + header.Timestamp
case HEADER_FMT_CONTINUATION:
if chunkstream.receivedMessage != nil {
// Continuation the previous unfinished message
message = chunkstream.receivedMessage
}
if chunkstream.lastHeader == nil {
logger.ModulePrintf(logHandler, log.LOG_LEVEL_WARNING,
"A new message with fmt: %d, csi: %d\n", vfmt, csi)
header.Dump("err")
} else {
header.MessageStreamID = chunkstream.lastHeader.MessageStreamID
header.MessageLength = chunkstream.lastHeader.MessageLength
header.MessageTypeID = chunkstream.lastHeader.MessageTypeID
header.Timestamp = chunkstream.lastHeader.Timestamp
}
chunkstream.lastHeader = header
absoluteTimestamp = chunkstream.lastInAbsoluteTimestamp
}
if message == nil {
// New message
message = &Message{
ChunkStreamID: csi,
Type: header.MessageTypeID,
Timestamp: header.RealTimestamp(),
Size: header.MessageLength,
StreamID: header.MessageStreamID,
Buf: new(bytes.Buffer),
IsInbound: true,
AbsoluteTimestamp: absoluteTimestamp,
}
}
chunkstream.lastInAbsoluteTimestamp = absoluteTimestamp
// Read data
remain = message.Remain()
var n64 int64
if remain <= conn.inChunkSize {
// One chunk message
for {
// n64, err = CopyNFromNetwork(message.Buf, conn.br, int64(remain))
n64, err = io.CopyN(message.Buf, conn.br, int64(remain))
if err == nil {
conn.inBytes += uint32(n64)
if remain <= uint32(n64) {
break
} else {
remain -= uint32(n64)
logger.ModulePrintf(logHandler, log.LOG_LEVEL_TRACE,
"Message continue copy remain: %d\n", remain)
continue
}
}
netErr, ok := err.(net.Error)
if !ok || !netErr.Temporary() {
CheckError(err, "Read data 1")
}
logger.ModulePrintf(logHandler, log.LOG_LEVEL_TRACE,
"Message copy blocked!\n")
}
// Finished message
conn.received(message)
chunkstream.receivedMessage = nil
} else {
// Unfinish
logger.ModulePrintf(logHandler, log.LOG_LEVEL_DEBUG,
"Unfinish message(remain: %d, chunksize: %d)\n", remain, conn.inChunkSize)
remain = conn.inChunkSize
for {
// n64, err = CopyNFromNetwork(message.Buf, conn.br, int64(remain))
n64, err = io.CopyN(message.Buf, conn.br, int64(remain))
if err == nil {
conn.inBytes += uint32(n64)
if remain <= uint32(n64) {
break
} else {
remain -= uint32(n64)
logger.ModulePrintf(logHandler, log.LOG_LEVEL_TRACE,
"Unfinish message continue copy remain: %d\n", remain)
continue
}
break
}
netErr, ok := err.(net.Error)
if !ok || !netErr.Temporary() {
CheckError(err, "Read data 2")
}
logger.ModulePrintf(logHandler, log.LOG_LEVEL_TRACE,
"Unfinish message copy blocked!\n")
}
chunkstream.receivedMessage = message
}
// Check window
if conn.inBytes > (conn.inBytesPreWindow + conn.inWindowSize) {
// Send window acknowledgement
ackmessage := NewMessage(CS_ID_PROTOCOL_CONTROL, ACKNOWLEDGEMENT, 0, absoluteTimestamp+1, nil)
err = binary.Write(ackmessage.Buf, binary.BigEndian, conn.inBytes)
CheckError(err, "ACK Message write data")
conn.inBytesPreWindow = conn.inBytes
conn.Send(ackmessage)
}
}
}
func (conn *conn) error(err error, desc string) {
logger.ModulePrintf(logHandler, log.LOG_LEVEL_TRACE,
"Conn %s err: %s\n", desc, err.Error())
if conn.err == nil {
conn.err = err
}
conn.Close()
}
func (conn *conn) Close() {
// panic(errors.New("Closed"))
conn.closed = true
conn.c.Close()
}
// Send a message by channel
func (conn *conn) Send(message *Message) error {
csiType := (message.ChunkStreamID % 6)
if csiType == CS_ID_PROTOCOL_CONTROL || csiType == CS_ID_COMMAND {
// High priority
conn.highPriorityMessageQueue <- message
return nil
}
if message.Type == VIDEO_TYPE {
// Low priority
conn.lowPriorityMessageQueue <- message
return nil
}
conn.middlePriorityMessageQueue <- message
return nil
}
func (conn *conn) CreateChunkStream(id uint32) (*OutboundChunkStream, error) {
chunkStream, found := conn.outChunkStreams[id]
if found {
return nil, errors.New("Chunk stream existed")
}
chunkStream = NewOutboundChunkStream(id)
conn.outChunkStreams[id] = chunkStream
return chunkStream, nil
}
func (conn *conn) CloseChunkStream(id uint32) {
delete(conn.outChunkStreams, id)
}
func (conn *conn) CreateMediaChunkStream() (*OutboundChunkStream, error) {
var newChunkStreamID uint32
conn.mediaChunkStreamIDAllocatorLocker.Lock()
for index, occupited := range conn.mediaChunkStreamIDAllocator {
if !occupited {
newChunkStreamID = uint32((index+1)*6 + 2)
logger.ModulePrintf(logHandler, log.LOG_LEVEL_DEBUG,
"index: %d, newChunkStreamID: %d\n", index, newChunkStreamID)
// since allocate a newChunkStreamID, why not set the cocupited to true
conn.mediaChunkStreamIDAllocator[index] = true
break
}
}
conn.mediaChunkStreamIDAllocatorLocker.Unlock()
if newChunkStreamID == 0 {
return nil, errors.New("No more chunk stream ID to allocate")
}
chunkSteam, err := conn.CreateChunkStream(newChunkStreamID)
if err != nil {
conn.CloseMediaChunkStream(newChunkStreamID)
return nil, err
}
return chunkSteam, nil
}
func (conn *conn) OutboundChunkStream(id uint32) (chunkStream *OutboundChunkStream, found bool) {
chunkStream, found = conn.outChunkStreams[id]
return
}
func (conn *conn) InboundChunkStream(id uint32) (chunkStream *InboundChunkStream, found bool) {
chunkStream, found = conn.inChunkStreams[id]
return
}
func (conn *conn) CloseMediaChunkStream(id uint32) {
// and the id is not the index of Allocator slice
index := (id - 2) / 6 - 1
conn.mediaChunkStreamIDAllocatorLocker.Lock()
conn.mediaChunkStreamIDAllocator[index] = false
conn.mediaChunkStreamIDAllocatorLocker.Unlock()
conn.CloseChunkStream(id)
}
func (conn *conn) NewTransactionID() uint32 {
return atomic.AddUint32(&conn.lastTransactionID, 1)
}
func (conn *conn) received(message *Message) {
message.Dump("<<<")
tmpBuf := make([]byte, 4)
var err error
var subType byte
var dataSize uint32
var timestamp uint32
var timestampExt byte
if message.Type == AGGREGATE_MESSAGE_TYPE {
// Byte stream order
// Sub message type 1 byte
// Data size 3 bytes, big endian
// Timestamp 3 bytes
// Timestamp extend 1 byte, result = (result >>> 8) | ((result & 0x000000ff) << 24);
// 3 bytes ignored
// Data
// Previous tag size 4 bytes
var firstAggregateTimestamp uint32
for message.Buf.Len() > 0 {
// Sub type
subType, err = message.Buf.ReadByte()
if err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::received() AGGREGATE_MESSAGE_TYPE read sub type err:", err)
return
}
// data size
_, err = io.ReadAtLeast(message.Buf, tmpBuf[1:], 3)
if err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::received() AGGREGATE_MESSAGE_TYPE read data size err:", err)
return
}
dataSize = binary.BigEndian.Uint32(tmpBuf)
// Timestamp
_, err = io.ReadAtLeast(message.Buf, tmpBuf[1:], 3)
if err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::received() AGGREGATE_MESSAGE_TYPE read timestamp err:", err)
return
}
timestamp = binary.BigEndian.Uint32(tmpBuf)
// Timestamp extend
timestampExt, err = message.Buf.ReadByte()
if err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::received() AGGREGATE_MESSAGE_TYPE read timestamp extend err:", err)
return
}
timestamp |= (uint32(timestampExt) << 24)
if firstAggregateTimestamp == 0 {
firstAggregateTimestamp = timestamp
}
// Ignore 3 bytes
_, err = io.ReadAtLeast(message.Buf, tmpBuf[1:], 3)
if err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::received() AGGREGATE_MESSAGE_TYPE read ignore bytes err:", err)
return
}
subMessage := NewMessage(message.ChunkStreamID, subType, message.StreamID, 0, nil)
subMessage.Timestamp = 0
subMessage.IsInbound = true
subMessage.Size = dataSize
subMessage.AbsoluteTimestamp = message.AbsoluteTimestamp
// Data
_, err = io.CopyN(subMessage.Buf, message.Buf, int64(dataSize))
if err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::received() AGGREGATE_MESSAGE_TYPE copy data err:", err)
return
}
// Recursion
conn.received(subMessage)
// Previous tag size
if message.Buf.Len() >= 4 {
_, err = io.ReadAtLeast(message.Buf, tmpBuf, 4)
if err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::received() AGGREGATE_MESSAGE_TYPE read previous tag size err:", err)
return
}
tmpBuf[0] = 0
} else {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::received() AGGREGATE_MESSAGE_TYPE miss previous tag size")
break
}
}
} else {
switch message.ChunkStreamID {
case CS_ID_PROTOCOL_CONTROL:
switch message.Type {
case SET_CHUNK_SIZE:
conn.invokeSetChunkSize(message)
case ABORT_MESSAGE:
conn.invokeAbortMessage(message)
case ACKNOWLEDGEMENT:
conn.invokeAcknowledgement(message)
case USER_CONTROL_MESSAGE:
conn.invokeUserControlMessage(message)
case WINDOW_ACKNOWLEDGEMENT_SIZE:
conn.invokeWindowAcknowledgementSize(message)
case SET_PEER_BANDWIDTH:
conn.invokeSetPeerBandwidth(message)
default:
logger.ModulePrintf(logHandler, log.LOG_LEVEL_TRACE,
"Unkown message type %d in Protocol control chunk stream!\n", message.Type)
}
case CS_ID_COMMAND:
if message.StreamID == 0 {
cmd := &Command{}
var err error
var transactionID float64
var object interface{}
switch message.Type {
case COMMAND_AMF3:
cmd.IsFlex = true
_, err = message.Buf.ReadByte()
if err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"Read first in flex commad err:", err)
return
}
fallthrough
case COMMAND_AMF0:
cmd.Name, err = amf.ReadString(message.Buf)
if err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"AMF0 Read name err:", err)
return
}
transactionID, err = amf.ReadDouble(message.Buf)
if err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"AMF0 Read transactionID err:", err)
return
}
cmd.TransactionID = uint32(transactionID)
for message.Buf.Len() > 0 {
object, err = amf.ReadValue(message.Buf)
if err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"AMF0 Read object err:", err)
return
}
cmd.Objects = append(cmd.Objects, object)
}
default:
logger.ModulePrintf(logHandler, log.LOG_LEVEL_TRACE,
"Unkown message type %d in Command chunk stream!\n", message.Type)
}
conn.invokeCommand(cmd)
} else {
conn.handler.OnReceived(conn, message)
}
default:
conn.handler.OnReceived(conn, message)
}
}
}
func (conn *conn) invokeSetChunkSize(message *Message) {
if err := binary.Read(message.Buf, binary.BigEndian, &conn.inChunkSize); err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::invokeSetChunkSize err:", err)
}
logger.ModulePrintf(logHandler, log.LOG_LEVEL_TRACE,
"conn::invokeSetChunkSize() conn.inChunkSize = %d\n", conn.inChunkSize)
}
func (conn *conn) invokeAbortMessage(message *Message) {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_TRACE,
"conn::invokeAbortMessage()")
}
func (conn *conn) invokeAcknowledgement(message *Message) {
logger.ModulePrintf(logHandler, log.LOG_LEVEL_TRACE,
"conn::invokeAcknowledgement(): % 2x\n", message.Buf.Bytes())
}
// User Control Message
//
// The client or the server sends this message to notify the peer about
// the user control events. This message carries Event type and Event
// data.
// +------------------------------+-------------------------
// | Event Type ( 2- bytes ) | Event Data
// +------------------------------+-------------------------
// Figure 5 Pay load for the ‘User Control Message’.
//
//
// The first 2 bytes of the message data are used to identify the Event
// type. Event type is followed by Event data. Size of Event data field
// is variable.
//
//
// The client or the server sends this message to notify the peer about
// the user control events. For information about the message format,
// refer to the User Control Messages section in the RTMP Message
// Foramts draft.
//
// The following user control event types are supported:
// +---------------+--------------------------------------------------+
// | Event | Description |
// +---------------+--------------------------------------------------+
// |Stream Begin | The server sends this event to notify the client |
// | (=0) | that a stream has become functional and can be |
// | | used for communication. By default, this event |
// | | is sent on ID 0 after the application connect |
// | | command is successfully received from the |
// | | client. The event data is 4-byte and represents |
// | | the stream ID of the stream that became |
// | | functional. |
// +---------------+--------------------------------------------------+
// | Stream EOF | The server sends this event to notify the client |
// | (=1) | that the playback of data is over as requested |
// | | on this stream. No more data is sent without |
// | | issuing additional commands. The client discards |
// | | the messages received for the stream. The |
// | | 4 bytes of event data represent the ID of the |
// | | stream on which playback has ended. |
// +---------------+--------------------------------------------------+
// | StreamDry | The server sends this event to notify the client |
// | (=2) | that there is no more data on the stream. If the |
// | | server does not detect any message for a time |
// | | period, it can notify the subscribed clients |
// | | that the stream is dry. The 4 bytes of event |
// | | data represent the stream ID of the dry stream. |
// +---------------+--------------------------------------------------+
// | SetBuffer | The client sends this event to inform the server |
// | Length (=3) | of the buffer size (in milliseconds) that is |
// | | used to buffer any data coming over a stream. |
// | | This event is sent before the server starts |
// | | processing the stream. The first 4 bytes of the |
// | | event data represent the stream ID and the next |
// | | 4 bytes represent the buffer length, in |
// | | milliseconds. |
// +---------------+--------------------------------------------------+
// | StreamIs | The server sends this event to notify the client |
// | Recorded (=4) | that the stream is a recorded stream. The |
// | | 4 bytes event data represent the stream ID of |
// | | the recorded stream. |
// +---------------+--------------------------------------------------+
// | PingRequest | The server sends this event to test whether the |
// | (=6) | client is reachable. Event data is a 4-byte |
// | | timestamp, representing the local server time |
// | | when the server dispatched the command. The |
// | | client responds with kMsgPingResponse on |
// | | receiving kMsgPingRequest. |
// +---------------+--------------------------------------------------+
// | PingResponse | The client sends this event to the server in |
// | (=7) | response to the ping request. The event data is |
// | | a 4-byte timestamp, which was received with the |
// | | kMsgPingRequest request. |
// +---------------+--------------------------------------------------+
func (conn *conn) invokeUserControlMessage(message *Message) {
var eventType uint16
err := binary.Read(message.Buf, binary.BigEndian, &eventType)
if err != nil {
logger.ModulePrintf(logHandler, log.LOG_LEVEL_WARNING,
"conn::invokeUserControlMessage() read event type err: %s\n", err.Error())
return
}
switch eventType {
case EVENT_STREAM_BEGIN:
logger.ModulePrintln(logHandler, log.LOG_LEVEL_TRACE, "conn::invokeUserControlMessage() EVENT_STREAM_BEGIN")
case EVENT_STREAM_EOF:
logger.ModulePrintln(logHandler, log.LOG_LEVEL_TRACE, "conn::invokeUserControlMessage() EVENT_STREAM_EOF")
case EVENT_STREAM_DRY:
logger.ModulePrintln(logHandler, log.LOG_LEVEL_TRACE, "conn::invokeUserControlMessage() EVENT_STREAM_DRY")
case EVENT_SET_BUFFER_LENGTH:
logger.ModulePrintln(logHandler, log.LOG_LEVEL_TRACE, "conn::invokeUserControlMessage() EVENT_SET_BUFFER_LENGTH")
case EVENT_STREAM_IS_RECORDED:
logger.ModulePrintln(logHandler, log.LOG_LEVEL_TRACE, "conn::invokeUserControlMessage() EVENT_STREAM_IS_RECORDED")
case EVENT_PING_REQUEST:
// Respond ping
// Get server timestamp
var serverTimestamp uint32
err = binary.Read(message.Buf, binary.BigEndian, &serverTimestamp)
if err != nil {
logger.ModulePrintf(logHandler, log.LOG_LEVEL_WARNING,
"conn::invokeUserControlMessage() read serverTimestamp err: %s\n", err.Error())
return
}
respmessage := NewMessage(CS_ID_PROTOCOL_CONTROL, USER_CONTROL_MESSAGE, 0, message.Timestamp+1, nil)
respEventType := uint16(EVENT_PING_RESPONSE)
if err = binary.Write(respmessage.Buf, binary.BigEndian, &respEventType); err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::invokeUserControlMessage() write event type err:", err)
return
}
if err = binary.Write(respmessage.Buf, binary.BigEndian, &serverTimestamp); err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::invokeUserControlMessage() write streamId err:", err)
return
}
logger.ModulePrintln(logHandler, log.LOG_LEVEL_TRACE, "conn::invokeUserControlMessage() Ping response")
conn.Send(respmessage)
case EVENT_PING_RESPONSE:
logger.ModulePrintln(logHandler, log.LOG_LEVEL_TRACE, "conn::invokeUserControlMessage() EVENT_PING_RESPONSE")
case EVENT_REQUEST_VERIFY:
logger.ModulePrintln(logHandler, log.LOG_LEVEL_TRACE, "conn::invokeUserControlMessage() EVENT_REQUEST_VERIFY")
case EVENT_RESPOND_VERIFY:
logger.ModulePrintln(logHandler, log.LOG_LEVEL_TRACE, "conn::invokeUserControlMessage() EVENT_RESPOND_VERIFY")
case EVENT_BUFFER_EMPTY:
logger.ModulePrintln(logHandler, log.LOG_LEVEL_TRACE, "conn::invokeUserControlMessage() EVENT_BUFFER_EMPTY")
case EVENT_BUFFER_READY:
logger.ModulePrintln(logHandler, log.LOG_LEVEL_TRACE, "conn::invokeUserControlMessage() EVENT_BUFFER_READY")
default:
logger.ModulePrintf(logHandler, log.LOG_LEVEL_TRACE, "conn::invokeUserControlMessage() Unknown user control message :0x%x\n", eventType)
}
}
func (conn *conn) invokeWindowAcknowledgementSize(message *Message) {
var size uint32
var err error
if err = binary.Read(message.Buf, binary.BigEndian, &size); err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::invokeWindowAcknowledgementSize read window size err:", err)
return
}
conn.inWindowSize = size
logger.ModulePrintf(logHandler, log.LOG_LEVEL_TRACE,
"conn::invokeWindowAcknowledgementSize() conn.inWindowSize = %d\n", conn.inWindowSize)
}
func (conn *conn) invokeSetPeerBandwidth(message *Message) {
var err error
var size uint32
if err = binary.Read(message.Buf, binary.BigEndian, &conn.inBandwidth); err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::invokeSetPeerBandwidth read window size err:", err)
return
}
conn.inBandwidth = size
var limit byte
if limit, err = message.Buf.ReadByte(); err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::invokeSetPeerBandwidth read limit err:", err)
return
}
conn.inBandwidthLimit = uint8(limit)
logger.ModulePrintf(logHandler, log.LOG_LEVEL_TRACE,
"conn.inBandwidthLimit = %d/n", conn.inBandwidthLimit)
}
func (conn *conn) invokeCommand(cmd *Command) {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_TRACE,
"conn::invokeCommand()")
conn.handler.OnReceivedRtmpCommand(conn, cmd)
}
func (conn *conn) SetStreamBufferSize(streamId uint32, size uint32) {
logger.ModulePrintf(logHandler, log.LOG_LEVEL_TRACE,
"conn::SetStreamBufferSize(streamId: %d, size: %d)\n", streamId, size)
message := NewMessage(CS_ID_PROTOCOL_CONTROL, USER_CONTROL_MESSAGE, 0, 1, nil)
eventType := uint16(EVENT_SET_BUFFER_LENGTH)
if err := binary.Write(message.Buf, binary.BigEndian, &eventType); err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::SetStreamBufferSize write event type err:", err)
return
}
if err := binary.Write(message.Buf, binary.BigEndian, &streamId); err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::SetStreamBufferSize write streamId err:", err)
return
}
if err := binary.Write(message.Buf, binary.BigEndian, &size); err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::SetStreamBufferSize write size err:", err)
return
}
conn.Send(message)
}
func (conn *conn) SetChunkSize(size uint32) {
logger.ModulePrintf(logHandler, log.LOG_LEVEL_TRACE,
"conn::SetChunkSize(size: %d)\n", size)
message := NewMessage(CS_ID_PROTOCOL_CONTROL, SET_CHUNK_SIZE, 0, 0, nil)
if err := binary.Write(message.Buf, binary.BigEndian, &size); err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::SetChunkSize write event type err:", err)
return
}
conn.outChunkSizeTemp = size
conn.Send(message)
}
func (conn *conn) SetWindowAcknowledgementSize() {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_TRACE,
"conn::SetWindowAcknowledgementSize")
// Request window acknowledgement size
message := NewMessage(CS_ID_PROTOCOL_CONTROL, WINDOW_ACKNOWLEDGEMENT_SIZE, 0, 0, nil)
if err := binary.Write(message.Buf, binary.BigEndian, &conn.outWindowSize); err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::SetWindowAcknowledgementSize write window size err:", err)
return
}
message.Size = uint32(message.Buf.Len())
conn.Send(message)
}
func (conn *conn) SetPeerBandwidth(peerBandwidth uint32, limitType byte) {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_TRACE,
"conn::SetPeerBandwidth")
// Request window acknowledgement size
message := NewMessage(CS_ID_PROTOCOL_CONTROL, SET_PEER_BANDWIDTH, 0, 0, nil)
if err := binary.Write(message.Buf, binary.BigEndian, &peerBandwidth); err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::SetPeerBandwidth write peerBandwidth err:", err)
return
}
if err := message.Buf.WriteByte(limitType); err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::SetPeerBandwidth write limitType err:", err)
return
}
message.Size = uint32(message.Buf.Len())
conn.Send(message)
}
func (conn *conn) SendUserControlMessage(eventId uint16) {
logger.ModulePrintf(logHandler, log.LOG_LEVEL_TRACE,
"conn::SendUserControlMessage")
message := NewMessage(CS_ID_PROTOCOL_CONTROL, USER_CONTROL_MESSAGE, 0, 0, nil)
if err := binary.Write(message.Buf, binary.BigEndian, &eventId); err != nil {
logger.ModulePrintln(logHandler, log.LOG_LEVEL_WARNING,
"conn::SendUserControlMessage write event type err:", err)
return
}
conn.Send(message)
}