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server.go
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server.go
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package chat
import (
"context"
"crypto/tls"
"errors"
"fmt"
"log"
"strings"
"sync"
"time"
"github.com/mengelbart/moqtransport"
)
var (
errUnknownChat = errors.New("unknwon chat id")
)
type Server struct {
chatRooms map[string]*room
peers map[*moqtransport.Peer]string
nextTrackID uint64
lock sync.Mutex
moq *moqtransport.Server
}
func NewServer(tlsConfig *tls.Config) *Server {
s := &Server{
chatRooms: map[string]*room{},
peers: map[*moqtransport.Peer]string{},
nextTrackID: 1,
lock: sync.Mutex{},
moq: &moqtransport.Server{
Handler: nil,
TLSConfig: tlsConfig,
},
}
s.moq.Handler = moqtransport.PeerHandler(moqtransport.PeerHandlerFunc(s.peerHandler()))
return s
}
func (s *Server) ListenQUIC(ctx context.Context, addr string) error {
return s.moq.ListenQUIC(ctx, addr)
}
func (s *Server) ListenWebTransport(ctx context.Context, addr string) error {
return s.moq.ListenWebTransport(ctx, addr)
}
func (s *Server) peerHandler() moqtransport.PeerHandlerFunc {
return func(p *moqtransport.Peer) {
var name string
p.OnAnnouncement(func(namespace string) error {
uri := strings.SplitN(namespace, "/", 3)
if len(uri) < 3 {
return errors.New("invalid announcement")
}
moq_chat, id, username := uri[0], uri[1], uri[2]
if moq_chat != "moq-chat" {
return errors.New("invalid moq-chat namespace")
}
name = username
if _, ok := s.chatRooms[id]; !ok {
s.chatRooms[id] = newChat(id)
}
return s.chatRooms[id].join(name, p)
})
p.OnSubscription(func(trackname string, t *moqtransport.SendTrack) (uint64, time.Duration, error) {
if len(name) == 0 {
// Subscribe requires a username which has to be announced
// before subscribing
return 0, 0, errors.New("subscribe without prior announcement")
}
namespace := strings.SplitN(trackname, "/", 3)
if len(namespace) < 2 {
return 0, 0, errors.New("invalid trackname")
}
moq_chat, id := namespace[0], namespace[1]
if moq_chat != "moq-chat" {
return 0, 0, errors.New("invalid moq-chat namespace")
}
r, ok := s.chatRooms[id]
if !ok {
return 0, 0, errUnknownChat
}
if len(namespace) == 2 {
go func() {
// TODO: Improve synchronization (buffer objects before
// subscription finished)
time.Sleep(100 * time.Millisecond)
s.chatRooms[id].subscribe(name, t)
}()
return 0, 0, nil
}
username := namespace[2]
r.lock.Lock()
defer r.lock.Unlock()
log.Printf("subscribing user %v to publisher %v", name, username)
if err := r.publishers[username].subscribe(name, t); err != nil {
return 0, 0, err
}
s.nextTrackID += 1
return s.nextTrackID, time.Duration(0), nil
})
}
}
type chatMessage struct {
sender string
content string
}
func (m *chatMessage) MarshalBinary() (data []byte, err error) {
return []byte(fmt.Sprintf("%v says: %v\n", m.sender, m.content)), nil
}
type subscriber struct {
name string
track *moqtransport.SendTrack
}