First commit

hub.go

@@ -0,0 +1,45 @@
+package main
+
+import "sync"
+
+// Hub diffuse les messages reçus aux navigateurs connectés en direct (SSE).
+type Hub struct {
+	mu   sync.RWMutex
+	subs map[chan *Entry]struct{}
+}
+
+func NewHub() *Hub {
+	return &Hub{subs: make(map[chan *Entry]struct{})}
+}
+
+func (h *Hub) Subscribe() chan *Entry {
+	ch := make(chan *Entry, 1024)
+	h.mu.Lock()
+	h.subs[ch] = struct{}{}
+	h.mu.Unlock()
+	return ch
+}
+
+func (h *Hub) Unsubscribe(ch chan *Entry) {
+	h.mu.Lock()
+	delete(h.subs, ch)
+	h.mu.Unlock()
+}
+
+// Publish ne bloque jamais : un client trop lent perd simplement des messages.
+func (h *Hub) Publish(e *Entry) {
+	h.mu.RLock()
+	defer h.mu.RUnlock()
+	for ch := range h.subs {
+		select {
+		case ch <- e:
+		default:
+		}
+	}
+}
+
+func (h *Hub) Count() int {
+	h.mu.RLock()
+	defer h.mu.RUnlock()
+	return len(h.subs)
+}