Function isClientLockable

packages/socket.io-cluster-engine/lib/engine.ts:113–132

(
  client: Socket,
  transportName: string,
  lockType: "read" | "write",
)

};

function isClientLockable(
  client: Socket,
  transportName: string,
  lockType: "read" | "write",
) {
  switch (transportName) {
    case "polling":
      return (
        client.transport.name === "polling" &&
        (lockType === "write" || !client.transport.writable)
      );
    case "websocket":
    case "webtransport":
      return (
        client.transport.name === "polling" &&
        !client.upgrading &&
        !client.upgraded
      );
  }
}

function isValidSessionId(str: string) {
  return typeof str === "string" && str.length === 20;