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conn_client.go
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conn_client.go
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package core
import (
"bytes"
"fmt"
"io"
"math/rand"
"net"
neturl "net/url"
"strings"
"github.com/bigsillybear/livego/av"
"github.com/bigsillybear/livego/protocol/amf"
log "github.com/sirupsen/logrus"
)
var (
respResult = "_result"
respError = "_error"
onStatus = "onStatus"
publishStart = "NetStream.Publish.Start"
playStart = "NetStream.Play.Start"
connectSuccess = "NetConnection.Connect.Success"
onBWDone = "onBWDone"
)
var (
ErrFail = fmt.Errorf("respone err")
)
type ConnClient struct {
done bool
transID int
url string
tcurl string
app string
title string
query string
curcmdName string
streamid uint32
conn *Conn
encoder *amf.Encoder
decoder *amf.Decoder
bytesw *bytes.Buffer
}
func NewConnClient() *ConnClient {
return &ConnClient{
transID: 1,
bytesw: bytes.NewBuffer(nil),
encoder: &amf.Encoder{},
decoder: &amf.Decoder{},
}
}
func (connClient *ConnClient) DecodeBatch(r io.Reader, ver amf.Version) (ret []interface{}, err error) {
vs, err := connClient.decoder.DecodeBatch(r, ver)
return vs, err
}
func (connClient *ConnClient) readRespMsg() error {
var err error
var rc ChunkStream
for {
if err = connClient.conn.Read(&rc); err != nil {
return err
}
if err != nil && err != io.EOF {
return err
}
switch rc.TypeID {
case 20, 17:
r := bytes.NewReader(rc.Data)
vs, _ := connClient.decoder.DecodeBatch(r, amf.AMF0)
log.Debugf("readRespMsg: vs=%v", vs)
for k, v := range vs {
switch v.(type) {
case string:
switch connClient.curcmdName {
case cmdConnect, cmdCreateStream:
if v.(string) != respResult {
return fmt.Errorf(v.(string))
}
case cmdPublish:
if v.(string) != onStatus {
return ErrFail
}
}
case float64:
switch connClient.curcmdName {
case cmdConnect, cmdCreateStream:
id := int(v.(float64))
if k == 1 {
if id != connClient.transID {
return ErrFail
}
} else if k == 3 {
connClient.streamid = uint32(id)
}
case cmdPublish:
if int(v.(float64)) != 0 {
return ErrFail
}
}
case amf.Object:
objmap := v.(amf.Object)
switch connClient.curcmdName {
case cmdConnect:
code, ok := objmap["code"]
if ok && code.(string) != connectSuccess {
return ErrFail
}
case cmdPublish:
code, ok := objmap["code"]
if ok && code.(string) != publishStart {
return ErrFail
}
}
}
}
return nil
}
}
}
func (connClient *ConnClient) writeMsg(args ...interface{}) error {
connClient.bytesw.Reset()
for _, v := range args {
if _, err := connClient.encoder.Encode(connClient.bytesw, v, amf.AMF0); err != nil {
return err
}
}
msg := connClient.bytesw.Bytes()
c := ChunkStream{
Format: 0,
CSID: 3,
Timestamp: 0,
TypeID: 20,
StreamID: connClient.streamid,
Length: uint32(len(msg)),
Data: msg,
}
connClient.conn.Write(&c)
return connClient.conn.Flush()
}
func (connClient *ConnClient) writeConnectMsg() error {
event := make(amf.Object)
event["app"] = connClient.app
event["type"] = "nonprivate"
event["flashVer"] = "FMS.3.1"
event["tcUrl"] = connClient.tcurl
connClient.curcmdName = cmdConnect
log.Debugf("writeConnectMsg: connClient.transID=%d, event=%v", connClient.transID, event)
if err := connClient.writeMsg(cmdConnect, connClient.transID, event); err != nil {
return err
}
return connClient.readRespMsg()
}
func (connClient *ConnClient) writeCreateStreamMsg() error {
connClient.transID++
connClient.curcmdName = cmdCreateStream
log.Debugf("writeCreateStreamMsg: connClient.transID=%d", connClient.transID)
if err := connClient.writeMsg(cmdCreateStream, connClient.transID, nil); err != nil {
return err
}
for {
err := connClient.readRespMsg()
if err == nil {
return err
}
if err == ErrFail {
log.Debugf("writeCreateStreamMsg readRespMsg err=%v", err)
return err
}
}
}
func (connClient *ConnClient) writePublishMsg() error {
connClient.transID++
connClient.curcmdName = cmdPublish
if err := connClient.writeMsg(cmdPublish, connClient.transID, nil, connClient.title, publishLive); err != nil {
return err
}
return connClient.readRespMsg()
}
func (connClient *ConnClient) writePlayMsg() error {
connClient.transID++
connClient.curcmdName = cmdPlay
log.Debugf("writePlayMsg: connClient.transID=%d, cmdPlay=%v, connClient.title=%v",
connClient.transID, cmdPlay, connClient.title)
if err := connClient.writeMsg(cmdPlay, 0, nil, connClient.title); err != nil {
return err
}
return connClient.readRespMsg()
}
func (connClient *ConnClient) Start(url string, method string) error {
u, err := neturl.Parse(url)
if err != nil {
return err
}
connClient.url = url
path := strings.TrimLeft(u.Path, "/")
ps := strings.SplitN(path, "/", 2)
if len(ps) != 2 {
return fmt.Errorf("u path err: %s", path)
}
connClient.app = ps[0]
connClient.title = ps[1]
connClient.query = u.RawQuery
connClient.tcurl = "rtmp://" + u.Host + "/" + connClient.app
port := ":1935"
host := u.Host
localIP := ":0"
var remoteIP string
if strings.Index(host, ":") != -1 {
host, port, err = net.SplitHostPort(host)
if err != nil {
return err
}
port = ":" + port
}
ips, err := net.LookupIP(host)
log.Debugf("ips: %v, host: %v", ips, host)
if err != nil {
log.Warning(err)
return err
}
remoteIP = ips[rand.Intn(len(ips))].String()
if strings.Index(remoteIP, ":") == -1 {
remoteIP += port
}
local, err := net.ResolveTCPAddr("tcp", localIP)
if err != nil {
log.Warning(err)
return err
}
log.Debug("remoteIP: ", remoteIP)
remote, err := net.ResolveTCPAddr("tcp", remoteIP)
if err != nil {
log.Warning(err)
return err
}
conn, err := net.DialTCP("tcp", local, remote)
if err != nil {
log.Warning(err)
return err
}
log.Debug("connection:", "local:", conn.LocalAddr(), "remote:", conn.RemoteAddr())
connClient.conn = NewConn(conn, 4*1024)
log.Debug("HandshakeClient....")
if err := connClient.conn.HandshakeClient(); err != nil {
return err
}
log.Debug("writeConnectMsg....")
if err := connClient.writeConnectMsg(); err != nil {
return err
}
log.Debug("writeCreateStreamMsg....")
if err := connClient.writeCreateStreamMsg(); err != nil {
log.Debug("writeCreateStreamMsg error", err)
return err
}
log.Debug("method control:", method, av.Publish, av.Play)
if method == av.Publish {
if err := connClient.writePublishMsg(); err != nil {
return err
}
} else if method == av.Play {
if err := connClient.writePlayMsg(); err != nil {
return err
}
}
return nil
}
func (connClient *ConnClient) Write(c ChunkStream) error {
if c.TypeID == av.TagScriptDataAmf0 ||
c.TypeID == av.TagScriptDataAmf3 {
var err error
if c.Data, err = amf.MetaDataReform(c.Data, amf.ADD); err != nil {
return err
}
c.Length = uint32(len(c.Data))
}
return connClient.conn.Write(&c)
}
func (connClient *ConnClient) Flush() error {
return connClient.conn.Flush()
}
func (connClient *ConnClient) Read(c *ChunkStream) (err error) {
return connClient.conn.Read(c)
}
func (connClient *ConnClient) GetInfo() (app string, name string, url string) {
app = connClient.app
name = connClient.title
url = connClient.url
return
}
func (connClient *ConnClient) GetStreamId() uint32 {
return connClient.streamid
}
func (connClient *ConnClient) Close(err error) {
connClient.conn.Close()
}