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package sse
import (
"sync"
)
type Broadcaster struct {
mu sync.RWMutex
subscribers map[chan []byte]struct{}
}
func NewBroadcaster() *Broadcaster {
return &Broadcaster{
subscribers: make(map[chan []byte]struct{}),
}
}
func (b *Broadcaster) Subscribe() chan []byte {
ch := make(chan []byte, 64)
b.mu.Lock()
b.subscribers[ch] = struct{}{}
b.mu.Unlock()
return ch
}
func (b *Broadcaster) Unsubscribe(ch chan []byte) {
b.mu.Lock()
delete(b.subscribers, ch)
b.mu.Unlock()
close(ch)
}
func (b *Broadcaster) Publish(data []byte) {
b.mu.RLock()
defer b.mu.RUnlock()
for ch := range b.subscribers {
select {
case ch <- data:
default:
}
}
}
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