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WebSocketGateway,
WebSocketServer,
SubscribeMessage,
OnGatewayConnection,
OnGatewayDisconnect,
MessageBody,
ConnectedSocket,
} from '@nestjs/websockets';
import { Server, Socket } from 'socket.io';
import { Logger, UseGuards } from '@nestjs/common';
import { Notification } from '../entities';
interface AuthenticatedSocket extends Socket {
userId?: string;
tenantId?: string;
}
@WebSocketGateway({
namespace: '/notifications',
cors: {
origin: process.env.FRONTEND_URL || '*',
credentials: true,
},
})
export class NotificationsGateway
implements OnGatewayConnection, OnGatewayDisconnect
{
@WebSocketServer()
server: Server;
private readonly logger = new Logger(NotificationsGateway.name);
// Map: "tenantId:userId" -> Set of socket IDs
private userSockets = new Map<string, Set<string>>();
// Map: socket ID -> user key
private socketUsers = new Map<string, string>();
handleConnection(client: AuthenticatedSocket) {
try {
const userId = this.extractUserId(client);
const tenantId = this.extractTenantId(client);
if (!userId || !tenantId) {
this.logger.warn(`Client ${client.id} connected without auth, disconnecting`);
client.disconnect();
return;
}
client.userId = userId;
client.tenantId = tenantId;
const userKey = `${tenantId}:${userId}`;
// Add to user sockets map
if (!this.userSockets.has(userKey)) {
this.userSockets.set(userKey, new Set());
}
this.userSockets.get(userKey)!.add(client.id);
// Add to socket users map
this.socketUsers.set(client.id, userKey);
// Join rooms
client.join(`tenant:${tenantId}`);
client.join(`user:${userId}`);
this.logger.debug(
`User ${userId} connected from tenant ${tenantId} (socket: ${client.id})`,
);
// Send connection confirmation
client.emit('connected', {
socketId: client.id,
userId,
tenantId,
});
} catch (error) {
this.logger.error(`Connection error: ${error.message}`);
client.disconnect();
}
}
handleDisconnect(client: AuthenticatedSocket) {
const userKey = this.socketUsers.get(client.id);
if (userKey) {
const sockets = this.userSockets.get(userKey);
if (sockets) {
sockets.delete(client.id);
if (sockets.size === 0) {
this.userSockets.delete(userKey);
}
}
this.socketUsers.delete(client.id);
}
this.logger.debug(`Client ${client.id} disconnected`);
}
/**
* Emit notification to a specific user
*/
async emitToUser(
tenantId: string,
userId: string,
notification: Partial<Notification>,
): Promise<number> {
const userKey = `${tenantId}:${userId}`;
const socketIds = this.userSockets.get(userKey);
if (!socketIds || socketIds.size === 0) {
this.logger.debug(`No active sockets for user ${userId}`);
return 0;
}
for (const socketId of socketIds) {
this.server.to(socketId).emit('notification:created', notification);
}
this.logger.debug(
`Emitted notification to user ${userId} (${socketIds.size} sockets)`,
);
return socketIds.size;
}
/**
* Emit to all users in a tenant
*/
async emitToTenant(
tenantId: string,
event: string,
data: any,
): Promise<void> {
this.server.to(`tenant:${tenantId}`).emit(event, data);
this.logger.debug(`Emitted ${event} to tenant ${tenantId}`);
}
/**
* Emit notification read event to sync across devices
*/
@SubscribeMessage('notification:read')
handleMarkAsRead(
@ConnectedSocket() client: AuthenticatedSocket,
@MessageBody() payload: { notificationId: string },
): void {
if (!client.userId || !client.tenantId) {
return;
}
const userKey = `${client.tenantId}:${client.userId}`;
const socketIds = this.userSockets.get(userKey);
if (socketIds) {
// Broadcast to all other sockets of the same user
for (const socketId of socketIds) {
if (socketId !== client.id) {
this.server.to(socketId).emit('notification:read', payload);
}
}
}
this.logger.debug(
`User ${client.userId} marked notification ${payload.notificationId} as read`,
);
}
/**
* Handle mark all as read
*/
@SubscribeMessage('notification:read-all')
handleMarkAllAsRead(@ConnectedSocket() client: AuthenticatedSocket): void {
if (!client.userId || !client.tenantId) {
return;
}
const userKey = `${client.tenantId}:${client.userId}`;
const socketIds = this.userSockets.get(userKey);
if (socketIds) {
for (const socketId of socketIds) {
if (socketId !== client.id) {
this.server.to(socketId).emit('notification:read-all', {});
}
}
}
this.logger.debug(`User ${client.userId} marked all notifications as read`);
}
/**
* Handle client requesting unread count
*/
@SubscribeMessage('notification:get-unread-count')
handleGetUnreadCount(
@ConnectedSocket() client: AuthenticatedSocket,
): { event: string } {
// The actual count will be fetched by the service and emitted back
return { event: 'notification:unread-count-requested' };
}
/**
* Emit unread count update to user
*/
async emitUnreadCount(
tenantId: string,
userId: string,
count: number,
): Promise<void> {
const userKey = `${tenantId}:${userId}`;
const socketIds = this.userSockets.get(userKey);
if (socketIds) {
for (const socketId of socketIds) {
this.server.to(socketId).emit('notification:unread-count', { count });
}
}
}
/**
* Emit notification deleted event
*/
async emitNotificationDeleted(
tenantId: string,
userId: string,
notificationId: string,
): Promise<void> {
const userKey = `${tenantId}:${userId}`;
const socketIds = this.userSockets.get(userKey);
if (socketIds) {
for (const socketId of socketIds) {
this.server
.to(socketId)
.emit('notification:deleted', { notificationId });
}
}
}
/**
* Get connected users count
*/
getConnectedUsersCount(): number {
return this.userSockets.size;
}
/**
* Get total socket connections
*/
getTotalConnections(): number {
return this.socketUsers.size;
}
/**
* Check if user is online
*/
isUserOnline(tenantId: string, userId: string): boolean {
const userKey = `${tenantId}:${userId}`;
const sockets = this.userSockets.get(userKey);
return sockets !== undefined && sockets.size > 0;
}
private extractUserId(client: Socket): string | null {
return (
(client.handshake.auth?.userId as string) ||
(client.handshake.query?.userId as string) ||
null
);
}
private extractTenantId(client: Socket): string | null {
return (
(client.handshake.auth?.tenantId as string) ||
(client.handshake.query?.tenantId as string) ||
null
);
}
}
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