init

app/websocket/notifications/hub.go

@@ -0,0 +1,136 @@
+package notifications
+
+import (
+	"encoding/json"
+	"sync"
+	"time"
+
+	"goravel/app/models"
+)
+
+type NotificationHub struct {
+	clients    map[uint]map[*notificationClient]bool
+	register   chan *notificationClient
+	unregister chan *notificationClient
+	broadcast  chan *models.Notification
+	mu         sync.RWMutex
+}
+
+var hubInstance = newNotificationHub()
+
+func init() {
+	go hubInstance.run()
+}
+
+func Hub() *NotificationHub {
+	return hubInstance
+}
+
+func newNotificationHub() *NotificationHub {
+	return &NotificationHub{
+		clients:    make(map[uint]map[*notificationClient]bool),
+		register:   make(chan *notificationClient),
+		unregister: make(chan *notificationClient),
+		broadcast:  make(chan *models.Notification, 100),
+	}
+}
+
+func (h *NotificationHub) run() {
+	for {
+		select {
+		case client := <-h.register:
+			h.addClient(client)
+		case client := <-h.unregister:
+			h.removeClient(client)
+		case notification := <-h.broadcast:
+			h.dispatch(notification)
+		}
+	}
+}
+
+func (h *NotificationHub) addClient(client *notificationClient) {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+
+	if _, ok := h.clients[client.adminID]; !ok {
+		h.clients[client.adminID] = make(map[*notificationClient]bool)
+	}
+	h.clients[client.adminID][client] = true
+}
+
+func (h *NotificationHub) removeClient(client *notificationClient) {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+
+	if adminClients, ok := h.clients[client.adminID]; ok {
+		if _, exists := adminClients[client]; exists {
+			delete(adminClients, client)
+			close(client.send)
+		}
+		if len(adminClients) == 0 {
+			delete(h.clients, client.adminID)
+		}
+	}
+}
+
+func (h *NotificationHub) dispatch(notification *models.Notification) {
+	payload := h.payload(notification)
+	data, err := json.Marshal(payload)
+	if err != nil {
+		return
+	}
+
+	if notification.ReceiverID == nil {
+		h.mu.RLock()
+		defer h.mu.RUnlock()
+		for _, adminClients := range h.clients {
+			for client := range adminClients {
+				client.send <- data
+			}
+		}
+		return
+	}
+
+	h.mu.RLock()
+	defer h.mu.RUnlock()
+	if adminClients, ok := h.clients[*notification.ReceiverID]; ok {
+		for client := range adminClients {
+			client.send <- data
+		}
+	}
+}
+
+func (h *NotificationHub) payload(notification *models.Notification) map[string]any {
+	var readAt *string
+	if notification.ReadAt != nil {
+		formatted := notification.ReadAt.Format(time.RFC3339)
+		readAt = &formatted
+	}
+
+	var receiver uint
+	if notification.ReceiverID != nil {
+		receiver = *notification.ReceiverID
+	}
+
+	var sender uint
+	if notification.SenderID != nil {
+		sender = *notification.SenderID
+	}
+
+	return map[string]any{
+		"id":          notification.ID,
+		"title":       notification.Title,
+		"content":     notification.Content,
+		"type":        notification.Type,
+		"sender_id":   sender,
+		"receiver_id": receiver,
+		"is_read":     notification.IsRead,
+		"read_at":     readAt,
+		"created_at":  notification.CreatedAt.Format(time.RFC3339),
+	}
+}
+
+func (h *NotificationHub) Broadcast(notification *models.Notification) {
+	h.broadcast <- notification
+}
+