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registry.go
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registry.go
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package main
import (
"fmt"
"log/slog"
"sync"
"github.com/google/uuid"
"github.com/pion/webrtc/v4"
)
// keep track of which channels are being used
// only permit one publisher per channel
type Registry struct {
sync.Mutex
channels map[string]*Channel
}
type Channel struct {
LocalTrack *webrtc.TrackLocalStaticRTP
Publisher *Publisher
Subscribers map[string]*Subscriber
}
type Publisher struct {
ID string
}
type Subscriber struct {
ID string
QuitChan chan struct{}
}
func NewRegistry() *Registry {
r := &Registry{}
r.channels = make(map[string]*Channel)
return r
}
func (r *Registry) AddPublisher(channelName string, localTrack *webrtc.TrackLocalStaticRTP) error {
r.Lock()
defer r.Unlock()
var channel *Channel
var ok bool
p := Publisher{}
p.ID = uuid.NewString()
if channel, ok = r.channels[channelName]; ok {
if channel.Publisher != nil {
return fmt.Errorf("channel %q is already in use", channelName)
}
channel.LocalTrack = localTrack
channel.Publisher = &p
} else {
channel = &Channel{
LocalTrack: localTrack,
Publisher: &p,
Subscribers: make(map[string]*Subscriber),
}
r.channels[channelName] = channel
}
slog.Info("publisher added", "channel", channelName)
return nil
}
func (r *Registry) NewSubscriber() *Subscriber {
s := &Subscriber{}
s.QuitChan = make(chan struct{})
s.ID = uuid.NewString()
return s
}
func (r *Registry) AddSubscriber(channelName string, s *Subscriber) error {
r.Lock()
defer r.Unlock()
var channel *Channel
var ok bool
if channel, ok = r.channels[channelName]; ok && channel.Publisher != nil {
channel.Subscribers[s.ID] = s
slog.Info("subscriber added", "channel", channelName, "subscriber_count", len(channel.Subscribers))
} else {
return fmt.Errorf("channel %q not ready", channelName)
}
return nil
}
func (r *Registry) RemovePublisher(channelName string) {
r.Lock()
defer r.Unlock()
if channel, ok := r.channels[channelName]; ok {
channel.Publisher = nil
// tell all subscribers to quit
for _, s := range channel.Subscribers {
close(s.QuitChan)
}
slog.Info("publisher removed", "channel", channelName)
}
}
func (r *Registry) RemoveSubscriber(channelName string, id string) {
r.Lock()
defer r.Unlock()
if channel, ok := r.channels[channelName]; ok {
delete(channel.Subscribers, id)
slog.Info("subscriber removed", "channel", channelName, "subscriber_count", len(channel.Subscribers))
}
}
func (r *Registry) GetChannels() []string {
r.Lock()
defer r.Unlock()
channels := make([]string, 0)
for name, c := range r.channels {
if c.Publisher != nil {
channels = append(channels, name)
}
}
return channels
}
func (r *Registry) GetChannel(channelName string) *Channel {
r.Lock()
defer r.Unlock()
for name, c := range r.channels {
if name == channelName && c.Publisher != nil {
return c
}
}
return nil
}