Function createDestroyer

src/utils.ts:524–546

(server: http.Server)

 * @return a function that destroys all connections and closes the server
 */
export function createDestroyer(server: http.Server): () => Promise<void> {
  const connections = new Set<Socket>();

  server.on("connection", (conn) => {
    connections.add(conn);
    conn.once("close", () => connections.delete(conn));
  });

  // Make calling destroyer again just noop but return the same promise.
  let destroyPromise: Promise<void> | undefined = undefined;
  return function destroyer() {
    if (!destroyPromise) {
      destroyPromise = new Promise((resolve, reject) => {
        server.close((err) => {
          if (err) return reject(err);
          resolve();
        });
        connections.forEach((socket) => socket.destroy());
      });
    }
    return destroyPromise;
  };
}

/**
 * Returns the given date formatted as `YYYY-mm-dd HH:mm:ss`.