Method attemptAcknowledgePong

packages/rtm-api/src/KeepAlive.ts:239–255

* Determines if a giving incoming event can be treated as an acknowledgement for the outstanding ping, and then * clears the ping if so. * @param event incoming slack event

(_type: string, event: { [key: string]: unknown })

   * @param event incoming slack event
   */
  private attemptAcknowledgePong(_type: string, event: { [key: string]: unknown }): void {
    if (this.client === undefined) {
      const error = new Error('no client found');
      (error as CodedError).code = ErrorCode.KeepAliveInconsistentState;
      throw error;
    }

    if (this.lastPing !== undefined && event.reply_to !== undefined && (event.reply_to as number) >= this.lastPing) {
      // this message is a reply that acks the previous ping, clear the last ping
      this.logger.debug('received pong, clearing pong timer');
      delete this.lastPing;

      // signal that this pong is done being handled
      this.clearPreviousPongTimer();
      this.client.off('slack_event', this.attemptAcknowledgePong);
    }
  }
}