ghostream/stream/srt/srt.go

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// Package srt serves a SRT server
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package srt
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// #include <srt/srt.h>
import "C"
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import (
"log"
"net"
"strconv"
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"strings"
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"github.com/haivision/srtgo"
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"gitlab.crans.org/nounous/ghostream/auth"
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)
var (
clientDataChannels map[string][]chan Packet
)
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// Options holds web package configuration
type Options struct {
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Enabled bool
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ListenAddress string
MaxClients int
}
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// Packet contains the necessary data to broadcast events like stream creating, packet receiving or stream closing.
type Packet struct {
Data []byte
PacketType string
StreamName string
}
// Split host and port from listen address
func splitHostPort(hostport string) (string, uint16) {
host, portS, err := net.SplitHostPort(hostport)
if err != nil {
log.Fatalf("Failed to split host and port from %s", hostport)
}
if host == "" {
host = "0.0.0.0"
}
port64, err := strconv.ParseUint(portS, 10, 16)
if err != nil {
log.Fatalf("Port is not a integer: %s", err)
}
return host, uint16(port64)
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}
// GetNumberConnectedSessions get the number of currently connected clients
func GetNumberConnectedSessions(streamID string) int {
return len(clientDataChannels[streamID])
}
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// Serve SRT server
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func Serve(cfg *Options, authBackend auth.Backend, forwardingChannel, webrtcChannel chan Packet) {
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if !cfg.Enabled {
// SRT is not enabled, ignore
return
}
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// Start SRT in listening mode
log.Printf("SRT server listening on %s", cfg.ListenAddress)
host, port := splitHostPort(cfg.ListenAddress)
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sck := srtgo.NewSrtSocket(host, port, nil)
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if err := sck.Listen(cfg.MaxClients); err != nil {
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log.Fatal("Unable to listen for SRT clients:", err)
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}
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clientDataChannels = make(map[string][]chan Packet)
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for {
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// Wait for new connection
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s, err := sck.Accept()
if err != nil {
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// Something wrong happenned
continue
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}
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// streamid can be "name:password" for streamer or "name" for viewer
streamID, err := s.GetSockOptString(C.SRTO_STREAMID)
if err != nil {
log.Print("Failed to get socket streamid")
continue
}
split := strings.Split(streamID, ":")
if clientDataChannels[streamID] == nil {
clientDataChannels[streamID] = make([]chan Packet, 0, cfg.MaxClients)
}
if len(split) > 1 {
// password was provided so it is a streamer
name, password := split[0], split[1]
if authBackend != nil {
// check password
if ok, err := authBackend.Login(name, password); !ok || err != nil {
log.Printf("Failed to authenticate for stream %s", name)
s.Close()
continue
}
}
go handleStreamer(s, name, clientDataChannels, forwardingChannel, webrtcChannel)
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} else {
// password was not provided so it is a viewer
name := split[0]
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dataChannel := make(chan Packet, 4096)
clientDataChannels[streamID] = append(clientDataChannels[streamID], dataChannel)
go handleViewer(s, name, dataChannel, clientDataChannels)
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}
}
}