Method setupWebsocket

packages/rtm-api/src/RTMClient.ts:552–573

* Set up method for the client's websocket instance. This method will attach event listeners.

(url: string)

   * Set up method for the client's websocket instance. This method will attach event listeners.
   */
  private setupWebsocket(url: string): void {
    // initialize the websocket
    const options: WebSocket.ClientOptions = Object.assign(
      {
        perMessageDeflate: false,
      },
      this.tlsConfig,
    );
    if (this.agentConfig !== undefined) {
      options.agent = this.agentConfig;
    }
    this.websocket = new WebSocket(url, options);

    // attach event listeners
    this.websocket.addEventListener('open', event => this.stateMachine.handle('websocket open', event));
    this.websocket.addEventListener('close', event => this.stateMachine.handle('websocket close', event));
    this.websocket.addEventListener('error', (event) => {
      this.logger.error(`A websocket error occurred: ${event.message}`);
      this.emit('error', websocketErrorWithOriginal(event.error));
    });
    this.websocket.addEventListener('message', this.onWebsocketMessage.bind(this));
  }

  /**
   * Tear down method for the client's websocket instance. This method undoes the work in setupWebsocket(url).