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/**
* SSE Stream Writer
* Interface for writing to SSE stream (compatible with Hono StreamingApi)
*/
interface SSEStreamWriter {
write: (data: string) => Promise<unknown>;
}
/**
* SSE Client Connection
* Represents a single client connection for Server-Sent Events
*/
interface SSEClient {
id: string;
stream: SSEStreamWriter;
userId: string;
connectedAt: number;
}
/**
* SSE Event Manager
* Manages all active SSE connections and broadcasts events to clients
* Implements singleton pattern for global event broadcasting
*/
class SSEEventManager {
private clients: Map<string, SSEClient> = new Map();
private pingInterval: NodeJS.Timeout | null = null;
// Track whether ping interval has been started (lazy initialization for Cloudflare Workers)
private pingIntervalStarted = false;
/**
* Register a new SSE client connection
*/
addClient(id: string, stream: SSEStreamWriter, userId: string): void {
// Start ping interval lazily on first client connection
// This avoids setInterval in global scope (not allowed in Cloudflare Workers)
if (!this.pingIntervalStarted) {
this.startPingInterval();
this.pingIntervalStarted = true;
}
this.clients.set(id, {
id,
stream,
userId,
connectedAt: Date.now(),
});
}
/**
* Remove a client connection
*/
removeClient(id: string): void {
const client = this.clients.get(id);
if (client) {
// Stream cleanup is handled by Hono
this.clients.delete(id);
}
}
/**
* Broadcast an event to all connected clients
*/
async broadcast(event: SSEEventData): Promise<void> {
const message = this.formatSSEMessage(event);
const failedClients: string[] = [];
// Send to all clients in parallel
await Promise.all(
Array.from(this.clients.entries()).map(async ([clientId, client]) => {
try {
await client.stream.write(message);
} catch (error) {
console.error(`[SSE] Failed to send to client ${clientId}:`, error);
failedClients.push(clientId);
}
}),
);
// Clean up failed clients
for (const clientId of failedClients) {
this.removeClient(clientId);
}
}
/**
* Broadcast an event to a specific user's connections
*/
async broadcastToUser(userId: string, event: SSEEventData): Promise<void> {
const message = this.formatSSEMessage(event);
const failedClients: string[] = [];
// Send to user's clients in parallel
await Promise.all(
Array.from(this.clients.entries())
.filter(([, client]) => client.userId === userId)
.map(async ([clientId, client]) => {
try {
await client.stream.write(message);
} catch (error) {
console.error(`[SSE] Failed to send to client ${clientId}:`, error);
failedClients.push(clientId);
}
}),
);
// Clean up failed clients
for (const clientId of failedClients) {
this.removeClient(clientId);
}
}
/**
* Format SSE message according to the SSE protocol
*/
private formatSSEMessage(event: SSEEventData): string {
const data = JSON.stringify(event);
return `event: message\ndata: ${data}\n\n`;
}
/**
* Send periodic ping to keep connections alive
*/
private startPingInterval(): void {
// Send ping every 30 seconds
this.pingInterval = setInterval(() => {
void this.broadcast({
type: 'ping',
timestamp: Date.now(),
});
}, 30 * 1000);
// Allow process to exit even if interval is active (e.g. in tests)
this.pingInterval.unref();
}
/**
* Stop ping interval (for cleanup)
*/
stopPingInterval(): void {
if (this.pingInterval) {
clearInterval(this.pingInterval);
this.pingInterval = null;
}
}
/**
* Get number of active connections
*/
getClientCount(): number {
return this.clients.size;
}
/**
* Get client IDs for a specific user
*/
getUserClients(userId: string): string[] {
return Array.from(this.clients.values())
.filter((client) => client.userId === userId)
.map((client) => client.id);
}
}
// Export singleton instance
export const sseEventManager = new SSEEventManager();
/**
* Helper function to emit an event to all clients
*/
export function emitSSEEvent(
type: SSEEventType,
data?: Record<string, unknown>,
): void {
void sseEventManager.broadcast({
type,
timestamp: Date.now(),
data,
});
}
/**
* Helper function to emit an event to a specific user
*/
export function emitSSEEventToUser(
userId: string,
type: SSEEventType,
data?: Record<string, unknown>,
): void {
void sseEventManager.broadcastToUser(userId, {
type,
timestamp: Date.now(),
data,
});
}
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