43 lines
766 B
Go
43 lines
766 B
Go
package main
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import (
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"encoding/json"
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"sync"
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)
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// Broker is a simple in-memory pub/sub for SSE events.
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type Broker struct {
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mu sync.Mutex
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clients map[chan []byte]struct{}
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}
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func newBroker() *Broker {
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return &Broker{clients: make(map[chan []byte]struct{})}
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}
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func (b *Broker) subscribe() chan []byte {
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ch := make(chan []byte, 8)
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b.mu.Lock()
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b.clients[ch] = struct{}{}
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b.mu.Unlock()
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return ch
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}
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func (b *Broker) unsubscribe(ch chan []byte) {
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b.mu.Lock()
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delete(b.clients, ch)
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b.mu.Unlock()
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close(ch)
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}
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func (b *Broker) publish(event string, data any) {
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payload, _ := json.Marshal(map[string]any{"event": event, "data": data})
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b.mu.Lock()
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defer b.mu.Unlock()
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for ch := range b.clients {
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select {
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case ch <- payload:
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default:
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}
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}
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}
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