yjs-server/dist/socket-ops.js

An extensible websocket server for the Yjs collaborative editing framework. Compatible with y-websocket.

import { CloseReason } from './types.js';
import { CONNECTING, invariant, OPEN } from './internal.js';
export const send = (conn, m) => {
    try {
        invariant(conn.readyState === OPEN || conn.readyState === CONNECTING, 'conn is not open');
        conn.send(m, (err) => {
            if (err)
                conn.close(CloseReason.INTERNAL_ERROR);
        });
    }
    catch (e) {
        conn.close(CloseReason.INTERNAL_ERROR);
    }
};
export const keepAlive = (conn, pingTimeout, logger) => {
    let isAlive = true;
    const pingInterval = setInterval(() => {
        try {
            if (isAlive) {
                isAlive = false;
                conn.ping();
            }
            else {
                clearInterval(pingInterval);
                conn.terminate();
            }
        }
        catch (err) {
            logger.error({ err }, 'error during keep alive');
            conn.terminate();
            clearInterval(pingInterval);
        }
    }, pingTimeout);
    conn.on('pong', () => {
        isAlive = true;
    });
    conn.addEventListener('close', () => {
        clearInterval(pingInterval);
    });
};