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// Copyright 2020, Chef. All rights reserved.
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// https://github.com/q191201771/lal
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//
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// Use of this source code is governed by a MIT-style license
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// that can be found in the License file.
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//
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// Author: Chef (191201771@qq.com)
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package rtsp
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import (
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"context"
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"fmt"
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"net"
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"net/url"
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"time"
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"github.com/q191201771/lal/pkg/base"
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"github.com/q191201771/lal/pkg/rtprtcp"
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"github.com/q191201771/lal/pkg/sdp"
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"github.com/q191201771/naza/pkg/connection"
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"github.com/q191201771/naza/pkg/nazahttp"
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"github.com/q191201771/naza/pkg/nazalog"
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"github.com/q191201771/naza/pkg/nazanet"
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)
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const (
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pullReadBufSize = 256
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)
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type PullSessionObserver interface {
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BaseInSessionObserver
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}
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type PullSessionOption struct {
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PullTimeoutMS int // 从调用Pull函数，到收到rtsp play response（接收音视频数据的前一步）的超时时间
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}
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var defaultPullSessionOption = PullSessionOption{
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PullTimeoutMS: 10000,
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}
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type PullSession struct {
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baseInSession *BaseInSession
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UniqueKey string // const after ctor
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option PullSessionOption // const after ctor
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CmdConn connection.Connection
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cseq int
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sessionID string
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rawURL string
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host string // without port
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hostport string
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pathWithQuery string
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}
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type ModPullSessionOption func(option *PullSessionOption)
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func NewPullSession(observer PullSessionObserver, modOptions ...ModPullSessionOption) *PullSession {
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option := defaultPullSessionOption
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for _, fn := range modOptions {
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fn(&option)
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}
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uk := base.GenUniqueKey(base.UKPRTSPPullSession)
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s := &PullSession{
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UniqueKey: uk,
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option: option,
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}
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baseInSession := &BaseInSession{
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UniqueKey: uk,
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stat: base.StatPub{
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StatSession: base.StatSession{
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Protocol: base.ProtocolRTSP,
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SessionID: uk,
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StartTime: time.Now().Format("2006-01-02 15:04:05.999"),
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},
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},
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observer: observer,
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cmdSession: s,
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}
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s.baseInSession = baseInSession
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nazalog.Infof("[%s] lifecycle new rtsp PullSession. session=%p", uk, s)
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return s
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}
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func (session *PullSession) Pull(rawURL string) error {
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var (
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ctx context.Context
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cancel context.CancelFunc
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)
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if session.option.PullTimeoutMS == 0 {
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ctx, cancel = context.WithCancel(context.Background())
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} else {
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ctx, cancel = context.WithTimeout(context.Background(), time.Duration(session.option.PullTimeoutMS)*time.Millisecond)
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}
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defer cancel()
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return session.pullContext(ctx, rawURL)
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}
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func (session *PullSession) Write(channel int, b []byte) error {
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return nil
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}
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func (session *PullSession) Dispose() error {
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return nil
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}
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func (session *PullSession) pullContext(ctx context.Context, rawURL string) error {
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errChan := make(chan error, 1)
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go func() {
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if err := session.connect(rawURL); err != nil {
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errChan <- err
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return
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}
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if err := session.writeOptions(); err != nil {
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errChan <- err
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return
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}
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if err := session.writeDescribe(); err != nil {
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errChan <- err
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return
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}
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if err := session.writeSetup(); err != nil {
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errChan <- err
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return
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}
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if err := session.writePlay(); err != nil {
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errChan <- err
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return
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}
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errChan <- nil
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}()
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select {
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case <-ctx.Done():
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return ctx.Err()
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case err := <-errChan:
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if err != nil {
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return err
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}
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}
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dummy := make([]byte, 1) // 用于接收TCP对端关闭FIN信号
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_, err := session.CmdConn.Read(dummy)
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return err
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}
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func (session *PullSession) connect(rawURL string) error {
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// # 从 url 中解析 host uri addr
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u, err := url.Parse(rawURL)
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if err != nil {
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return err
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}
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if u.Scheme != "rtsp" {
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return ErrRTSP
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}
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session.rawURL = rawURL
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if u.RawQuery == "" {
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session.pathWithQuery = u.Path
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} else {
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session.pathWithQuery = fmt.Sprintf("%s?%s", u.Path, u.RawQuery)
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}
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// TODO chef: 检查其他协议pull session这块的处理
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host, _, err := net.SplitHostPort(u.Host)
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if err == nil {
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session.host = host
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session.hostport = u.Host
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} else {
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session.host = u.Host
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session.hostport = net.JoinHostPort(u.Host, fmt.Sprintf("%d", DefaultRTSPPort))
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}
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nazalog.Debugf("[%s] > tcp connect.", session.UniqueKey)
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// # 建立连接
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conn, err := net.Dial("tcp", session.hostport)
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if err != nil {
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return err
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}
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session.CmdConn = connection.New(conn, func(option *connection.Option) {
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option.ReadBufSize = pullReadBufSize
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})
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return nil
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}
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func (session *PullSession) writeOptions() error {
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session.cseq++
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req := PackRequestOptions(session.rawURL, session.cseq)
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nazalog.Debugf("[%s] > write options.", session.UniqueKey)
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if _, err := session.CmdConn.Write([]byte(req)); err != nil {
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return err
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}
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ctx, err := nazahttp.ReadHTTPResponseMessage(session.CmdConn)
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if err != nil {
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return err
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}
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nazalog.Debugf("[%s] < read response. %s", session.UniqueKey, ctx.StatusCode)
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return nil
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}
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func (session *PullSession) writeDescribe() error {
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session.cseq++
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req := PackRequestDescribe(session.rawURL, session.cseq)
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nazalog.Debugf("[%s] > write describe.", session.UniqueKey)
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if _, err := session.CmdConn.Write([]byte(req)); err != nil {
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return err
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}
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ctx, err := nazahttp.ReadHTTPResponseMessage(session.CmdConn)
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if err != nil {
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return err
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}
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nazalog.Debugf("[%s] < read response. code=%s, body=%s", session.UniqueKey, ctx.StatusCode, string(ctx.Body))
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sdpCtx, err := sdp.ParseSDP2LogicContext(ctx.Body)
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if err != nil {
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return err
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}
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session.baseInSession.InitWithSDP(ctx.Body, sdpCtx)
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return nil
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}
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func (session *PullSession) writeSetup() error {
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if session.baseInSession.sdpLogicCtx.VideoAControl != "" {
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if err := session.writeOneSetup(session.baseInSession.sdpLogicCtx.VideoAControl); err != nil {
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return err
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}
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}
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if session.baseInSession.sdpLogicCtx.AudioAControl != "" {
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if err := session.writeOneSetup(session.baseInSession.sdpLogicCtx.AudioAControl); err != nil {
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return err
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}
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}
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return nil
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}
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func (session *PullSession) writeOneSetup(aControl string) error {
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setupURI := fmt.Sprintf("%s/%s", session.rawURL, aControl)
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rtpC, rtpPort, rtcpC, rtcpPort, err := availUDPConnPool.Acquire2()
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if err != nil {
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return err
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}
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session.cseq++
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req := PackRequestSetup(setupURI, session.cseq, session.sessionID, int(rtpPort), int(rtcpPort))
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nazalog.Debugf("[%s] > write setup.", session.UniqueKey)
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if _, err := session.CmdConn.Write([]byte(req)); err != nil {
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return err
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}
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ctx, err := nazahttp.ReadHTTPResponseMessage(session.CmdConn)
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if err != nil {
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return err
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}
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nazalog.Debugf("[%s] < read response. code=%s, ctx=%+v", session.UniqueKey, ctx.StatusCode, ctx)
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session.sessionID = ctx.Headers[HeaderFieldSession]
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srvRTPPort, srvRTCPPort, err := parseServerPort(ctx.Headers[HeaderFieldTransport])
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if err != nil {
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return err
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}
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rtpConn, err := nazanet.NewUDPConnection(func(option *nazanet.UDPConnectionOption) {
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option.Conn = rtpC
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option.RAddr = net.JoinHostPort(session.host, fmt.Sprintf("%d", srvRTPPort))
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option.MaxReadPacketSize = rtprtcp.MaxRTPRTCPPacketSize
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})
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if err != nil {
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return err
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}
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rtcpConn, err := nazanet.NewUDPConnection(func(option *nazanet.UDPConnectionOption) {
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option.Conn = rtcpC
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option.RAddr = net.JoinHostPort(session.host, fmt.Sprintf("%d", srvRTCPPort))
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option.MaxReadPacketSize = rtprtcp.MaxRTPRTCPPacketSize
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})
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if err != nil {
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return err
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}
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if err := session.baseInSession.SetupWithConn(setupURI, rtpConn, rtcpConn); err != nil {
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return err
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}
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return nil
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}
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func (session *PullSession) writePlay() error {
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session.cseq++
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req := PackRequestPlay(session.rawURL, session.cseq, session.sessionID)
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nazalog.Debugf("[%s] > write play.", session.UniqueKey)
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if _, err := session.CmdConn.Write([]byte(req)); err != nil {
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return err
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}
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ctx, err := nazahttp.ReadHTTPResponseMessage(session.CmdConn)
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if err != nil {
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return err
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}
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nazalog.Debugf("[%s] < read response. %s", session.UniqueKey, ctx.StatusCode)
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return nil
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}
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