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* WebSocket upgrade handler for socket routes
* Uses ws package for WebSocket handshake
*/
import type { IncomingMessage } from 'http';
import type { Duplex } from 'stream';
import type { WebSocket } from 'ws';
import { WebSocketServer } from 'ws';
import { SOCKET_BASE_PATH } from '../../shared/constants.js';
import type { ApiClient, SocketEmitter, VitekApp } from '../shared/vitek-app.js';
export interface SocketEntry {
pattern: string;
params: string[];
file: string;
regex: RegExp;
handler: (ctx: VitekSocketContext) => void | (() => void);
}
export interface VitekSocketContext {
socket: WebSocket;
req: IncomingMessage;
params: Record<string, string>;
path: string;
/** Present when the app is run with shared context (dev, preview, production with vitek-serve). Use to call the REST API internally. */
api?: ApiClient;
}
/** Optional logger for socket events (connect, disconnect, message received/emitted). Uses same config as request logging. */
export interface SocketLogger {
socketConnected(path: string, pattern?: string): void;
socketDisconnected(path: string, pattern?: string): void;
socketMessageReceived(path: string, pattern?: string, data?: unknown): void;
socketMessageEmitted(path: string, data?: unknown): void;
}
export interface CreateSocketHandlerOptions {
sockets: SocketEntry[];
socketBasePath?: string;
/** When provided, the handler populates shared.sockets (emit) and passes shared.api into the user handler as ctx.api. */
shared?: VitekApp;
/** When provided and app has request logging enabled, logs connect/disconnect/received/emitted. */
logger?: SocketLogger;
}
/**
* Extracts pathname from request URL (without query string)
*/
function getPathname(req: IncomingMessage): string {
const url = req.url ?? '/';
const q = url.indexOf('?');
return q >= 0 ? url.slice(0, q) : url;
}
/**
* Matches a path against socket routes and returns the matched socket with extracted params
*/
function matchSocket(
sockets: SocketEntry[],
pathname: string
): { socket: SocketEntry; params: Record<string, string> } | null {
for (const socket of sockets) {
const match = pathname.match(socket.regex);
if (match) {
const params: Record<string, string> = {};
socket.params.forEach((name, i) => {
params[name] = match[i + 1] ?? '';
});
return { socket, params };
}
}
return null;
}
/** WebSocket OPEN state for safe send */
const WS_OPEN = 1;
/**
* Creates an HTTP upgrade handler for WebSocket connections.
* Registers with server.on('upgrade', handler).
* Does not intercept /__vite (Vite HMR) or paths outside socketBasePath.
* When options.shared is provided, populates shared.sockets (emit) and passes shared.api into the user handler as ctx.api.
*/
function fullSocketPath(basePath: string, pattern: string): string {
return pattern === '' ? basePath : `${basePath}/${pattern}`;
}
export function createSocketHandler(options: CreateSocketHandlerOptions): (req: IncomingMessage, socket: Duplex, head: Buffer) => void {
const { sockets, socketBasePath = SOCKET_BASE_PATH, shared, logger } = options;
if (sockets.length === 0) {
return () => {};
}
const registry = new Map<string, Set<WebSocket>>();
const emitter: SocketEmitter = {
emit(path: string, data: string | Buffer | object) {
logger?.socketMessageEmitted(fullSocketPath(socketBasePath, path), data);
const set = registry.get(path);
if (!set) return;
const payload =
typeof data === 'object' && data !== null && !Buffer.isBuffer(data)
? JSON.stringify(data)
: (data as string | Buffer);
for (const ws of set) {
if (ws.readyState === WS_OPEN) ws.send(payload);
}
},
};
if (shared) {
shared.sockets = emitter;
}
const wss = new WebSocketServer({ noServer: true });
return (req: IncomingMessage, socket: Duplex, head: Buffer) => {
const pathname = getPathname(req);
if (pathname.startsWith('/__vite')) {
return;
}
if (!pathname.startsWith(socketBasePath)) {
return;
}
const subPath = pathname.slice(socketBasePath.length) || '/';
const matched = matchSocket(sockets, subPath);
if (!matched) {
socket.destroy();
return;
}
const { socket: socketEntry, params } = matched;
const pattern = socketEntry.pattern;
wss.handleUpgrade(req, socket, head, (ws: WebSocket) => {
let set = registry.get(pattern);
Eif (!set) {
set = new Set();
registry.set(pattern, set);
}
set.add(ws);
logger?.socketConnected(pathname, pattern);
ws.on('message', (data: Buffer | ArrayBuffer | Buffer[]) => {
logger?.socketMessageReceived(pathname, pattern, data);
});
const removeFromRegistry = () => {
const s = registry.get(pattern);
if (s) {
s.delete(ws);
if (s.size === 0) registry.delete(pattern);
}
};
const cleanup = socketEntry.handler({
socket: ws,
req,
params,
path: pathname,
api: shared?.api,
});
const onClose = () => {
logger?.socketDisconnected(pathname, pattern);
removeFromRegistry();
if (typeof cleanup === 'function') cleanup();
};
ws.on('close', onClose);
});
};
}
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