reinit

backend/sse/sse.go

@@ -0,0 +1,48 @@
+package sse
+
+import (
+	"encoding/json"
+	"log"
+	"sync"
+)
+
+var (
+	clients      = make(map[string]map[chan string]bool) // checklist uuid → set of client channels
+	clientsMutex sync.Mutex
+)
+
+// RegisterClient registers a new SSE client
+func RegisterClient(uuid string, ch chan string) {
+	clientsMutex.Lock()
+	if clients[uuid] == nil {
+		clients[uuid] = make(map[chan string]bool)
+	}
+	clients[uuid][ch] = true
+	clientsMutex.Unlock()
+}
+
+// UnregisterClient removes an SSE client
+func UnregisterClient(uuid string, ch chan string) {
+	clientsMutex.Lock()
+	delete(clients[uuid], ch)
+	clientsMutex.Unlock()
+}
+
+// Broadcast sends a message to all SSE clients for a checklist
+func Broadcast(uuid string, msg interface{}) {
+	js, _ := json.Marshal(msg)
+	log.Printf("Broadcasting to %s: %s", uuid, string(js))
+	clientsMutex.Lock()
+	clientCount := len(clients[uuid])
+	log.Printf("Number of SSE clients for %s: %d", uuid, clientCount)
+	for ch := range clients[uuid] {
+		select {
+		case ch <- string(js):
+			log.Printf("Message sent to client")
+		default:
+			log.Printf("Channel full, skipping message")
+			// skip if channel is full (consider logging in prod!)
+		}
+	}
+	clientsMutex.Unlock()
+}