All files / src/networkWrapper/protocols socketio.js

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'use strict';
 
const
  RTWrapper = require('./abstract/realtime');
 
class SocketIO extends RTWrapper {
 
  constructor(options = {}) {
    super(options);
 
    Iif (typeof this.host !== 'string' || this.host === '') {
      throw new Error('options.host is required');
    }
 
    this.socket = null;
    this.forceDisconnect = false;
    this.eventsWrapper = {};
  }
 
  /**
   *
   * @returns {Promise<any>}
   */
  connect () {
    return new Promise((resolve, reject) => {
      super.connect();
 
      this.socket = window.io((this.ssl ? 'https://' : 'http://') + this.host + ':' + this.port, {
        reconnection: this.autoReconnect,
        reconnectionDelay: this.reconnectionDelay,
        forceNew: true
      });
 
      this.socket.on('connect', () => resolve(this.clientConnected()));
      this.socket.on('connect_error', error => {
        this.clientNetworkError(error);
        reject(error);
      });
 
      this.socket.on('disconnect', () => {
        if (this.forceDisconnect) {
          this.clientDisconnected();
        } else {
          const error = new Error('An error occurred, kuzzle may not be ready yet');
          error.status = 500;
 
          this.clientNetworkError(error);
          reject(error);
        }
 
        this.forceDisconnect = false;
      });
 
    });
  }
 
  /**
   * Registers a callback on an event.
   *
   * @param {string} event
   * @param {function} callback
   * @param {boolean} once
   */
  addListener (event, callback, once = false) {
    this._addEventWrapper(event, callback, once);
    super.addListener(event, callback, once);
 
    return this;
  }
 
  prependListener (event, callback, once = false) {
    this._addEventWrapper(event, callback, once);
    return super.prependListener(event, callback, once);
  }
 
  /**
   * Unregisters a callback from an event.
   *
   * @param {string} event
   * @param {function} callback
   */
  removeListener (event, callback) {
    Eif (this.eventsWrapper[event]) {
      this.eventsWrapper[event].listeners.delete(callback);
 
      if (this.eventsWrapper[event].listeners.size === 0) {
        this.socket.off(event, this.eventsWrapper[event].wrapper);
        delete this.eventsWrapper[event];
      }
 
      super.removeListener(event, callback);
    }
 
    return this;
  }
 
  /**
   * Unregisters all listeners either from an event, or from all events
   *
   * @param {string} [event]
   */
  removeAllListeners (event) {
    if (event !== undefined) {
      Eif (this.eventsWrapper[event] !== undefined) {
        for (const listener of this.eventsWrapper[event].listeners) {
          this.removeListener(event, listener);
        }
      }
    } else {
      for (const _event of Object.keys(this.eventsWrapper)) {
        this.removeAllListeners(_event);
      }
    }
 
    return this;
  }
 
  /**
   * Sends a payload to the connected server
   *
   * @param {Object} payload
   */
  send(payload) {
    this.socket.emit('kuzzle', payload);
  }
 
  /**
   * Closes the connection
   */
  close () {
    this.forceDisconnect = true;
    this.state = 'offline';
    this.socket.close();
    this.socket = null;
    super.close();
  }
 
  _addEventWrapper (event, callback, once = false) {
    if (!this.eventsWrapper[event]) {
      const wrapper = (...args) => this.emit(event, ...args);
 
      this.eventsWrapper[event] = {
        wrapper,
        listeners: new Set()
      };
 
      if (['connect', 'connect_error', 'disconnect'].indexOf(event) === -1) {
        if (once) {
          this.socket.once(event, wrapper);
        } else {
          this.socket.on(event, wrapper);
        }
      }
    }
 
    this.eventsWrapper[event].listeners.add(callback);
  }
}
 
module.exports = SocketIO;