backendless-rt-client/lib/session.js

Backendless RT Client for connect to Backendless RT Server

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;
var _regenerator = _interopRequireDefault(require("@babel/runtime/regenerator"));
var _asyncToGenerator2 = _interopRequireDefault(require("@babel/runtime/helpers/asyncToGenerator"));
var _classCallCheck2 = _interopRequireDefault(require("@babel/runtime/helpers/classCallCheck"));
var _createClass2 = _interopRequireDefault(require("@babel/runtime/helpers/createClass"));
var _constants = require("./constants");
var _socket = _interopRequireDefault(require("./socket"));
var INCREASE_RECONNECTION_TIMEOUT_STEP = 10;
var INITIAL_RECONNECTION_TIMEOUT = 200;
var MAX_RECONNECTION_TIMEOUT = 60 * 1000; // a minute

var wait = function wait(milliseconds) {
  return new Promise(function (resolve) {
    return setTimeout(resolve, milliseconds);
  });
};
var RTSession = exports["default"] = /*#__PURE__*/function () {
  function RTSession(config, dispatch, onDisconnect) {
    (0, _classCallCheck2["default"])(this, RTSession);
    this.config = config;
    this.dispatch = dispatch;
    this.onDisconnect = onDisconnect;
    this.connectAttempt = 0;
    this.socketPromise = this.connect();
  }
  return (0, _createClass2["default"])(RTSession, [{
    key: "terminate",
    value: function terminate() {
      if (!this.terminated) {
        this.terminated = true;
        this.dispatch = function () {
          //if sessions has been terminated don't need to dispatch any events
        };
        this.socketPromise.then(function (rtSocket) {
          if (rtSocket) {
            rtSocket.close();
          }
        });
      }
    }
  }, {
    key: "getSocket",
    value: function getSocket() {
      var _this = this;
      return this.socketPromise.then(function (rtSocket) {
        if (_this.terminated) {
          return new Promise(function () {
            //return unresolvable promise for preventing errors
            //this connection session has been terminated and a new one will be created if it necessary
          });
        }
        return rtSocket;
      });
    }
  }, {
    key: "getConnectionId",
    value: function () {
      var _getConnectionId = (0, _asyncToGenerator2["default"])(/*#__PURE__*/_regenerator["default"].mark(function _callee() {
        var _socket$ioSocket;
        var socket;
        return _regenerator["default"].wrap(function (_context) {
          while (1) switch (_context.prev = _context.next) {
            case 0:
              _context.next = 1;
              return this.getSocket();
            case 1:
              socket = _context.sent;
              return _context.abrupt("return", (socket === null || socket === void 0 || (_socket$ioSocket = socket.ioSocket) === null || _socket$ioSocket === void 0 || (_socket$ioSocket = _socket$ioSocket.io) === null || _socket$ioSocket === void 0 || (_socket$ioSocket = _socket$ioSocket.engine) === null || _socket$ioSocket === void 0 ? void 0 : _socket$ioSocket.id) || null);
            case 2:
            case "end":
              return _context.stop();
          }
        }, _callee, this);
      }));
      function getConnectionId() {
        return _getConnectionId.apply(this, arguments);
      }
      return getConnectionId;
    }()
  }, {
    key: "connect",
    value: function connect() {
      var _this2 = this;
      if (this.terminated) {
        return;
      }
      this.connectAttempt = this.connectAttempt + 1;
      var nextReconnectionTimeout = this.getNextReconnectionTimeout();
      this.onConnecting();
      if (this.connectAttempt > 1) {
        this.onReconnectAttempt(this.connectAttempt - 1, nextReconnectionTimeout);
      }
      return _socket["default"].connect(this.config, this.onSocketDisconnect.bind(this)).then(function (rtSocket) {
        _this2.connectAttempt = 0;
        _this2.onConnect();
        return rtSocket;
      })["catch"](function (error) {
        _this2.onConnectError(error);
        if (!_this2.terminated) {
          // wait for 400|800|1600|...|MAX_RECONNECTION_TIMEOUT milliseconds
          return wait(nextReconnectionTimeout).then(function () {
            return _this2.connect();
          });
        }
      });
    }
  }, {
    key: "getNextReconnectionTimeout",
    value: function getNextReconnectionTimeout() {
      var factor = Math.ceil(this.connectAttempt / INCREASE_RECONNECTION_TIMEOUT_STEP);
      var timeout = INITIAL_RECONNECTION_TIMEOUT * Math.pow(2, factor);
      return Math.min(timeout, MAX_RECONNECTION_TIMEOUT);
    }
  }, {
    key: "onSocketDisconnect",
    value: function onSocketDisconnect(reason) {
      this.dispatch(_constants.NativeSocketEvents.DISCONNECT, reason);
      if (!this.terminated) {
        this.terminate();
        this.onDisconnect();
      }
    }
  }, {
    key: "onConnecting",
    value: function onConnecting() {
      this.dispatch(_constants.NativeSocketEvents.CONNECTING);
    }
  }, {
    key: "onConnect",
    value: function onConnect() {
      this.dispatch(_constants.NativeSocketEvents.CONNECT);
    }
  }, {
    key: "onConnectError",
    value: function onConnectError(error) {
      this.dispatch(_constants.NativeSocketEvents.CONNECT_ERROR, error && error.message || error);
    }
  }, {
    key: "onReconnectAttempt",
    value: function onReconnectAttempt(attempt, timeout) {
      this.dispatch(_constants.NativeSocketEvents.RECONNECT_ATTEMPT, attempt, timeout);
    }
  }]);
}();