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jquery-simple-websocket

jquery simple websocket

Script này sẽ không được không được cài đặt trực tiếp. Nó là một thư viện cho các script khác để bao gồm các chỉ thị meta // @require https://update.greasyfork.org/scripts/407743/830687/jquery-simple-websocket.js

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*
* jQuery Simple Websocket
* https://github.com/jbloemendal/jquery-simple-websocket
*/

(function (factory) {
  if ('object' === typeof module && typeof 'object' === module.exports) {
      module.exports = factory(jQuery);
  } else {
      factory(jQuery);
  }
}(function($) {

    var SimpleWebSocket = function(opt) {
        if (this._isEmpty(opt, 'url')) {
            throw new Error('Missing argument, example usage: $.simpleWebSocket({ url: "ws://127.0.0.1:3000" }); ');
        } 
        this._opt = opt;

        this._ws = null;
        this._reConnectTries = 60;
        this._reConnectDeferred = null;
        this._dataType = this._prop(this._opt, 'dataType', 'json');

        this._listeners = [];

        var self = this;
        this._api = (function() {
            return {
                connect: function() {
                    return $.extend(self._api, self._reConnect.apply(self, []));
                },

                isConnected: function(callback) {
                    if (callback) {
                        callback.apply(this, [self._isConnected.apply(self, [])]);
                        return self._api;
                    } else {
                        return self._isConnected.apply(self, []);
                    }
                },

                send: function(data) {
                    return $.extend(self._api, self._send.apply(self, [data]));
                },

                listen: function(listener) {
                    return $.extend(self._api, self._listenReconnect.apply(self, [listener]));
                },

                remove: function(listener) {
                    self._remove.apply(self, [listener]);
                    return self._api;
                },

                removeAll: function() {
                    self._removeAll.apply(self, []);
                    return self._api;
                },

                close: function() {
                    self._close.apply(self, []);
                    self._reset.apply(self, []);
                    return self._api;
                }
            };
        })();

        return this._api;
    };

    SimpleWebSocket.prototype = {

        _createWebSocket: function(opt) {
            var ws = null;
            if (opt.protocols) {
                if ('undefined' === typeof window.MozWebSocket) {
                    if (window.WebSocket) {
                        ws = new WebSocket(opt.url, opt.protocols); 
                    } else {
                        throw new Error('Error, websocket could not be initialized.');
                    }
                } else {
                    ws = new MozWebSocket(opt.url, opt.protocols); 
                }
            } else {
                if ('undefined' === typeof window.MozWebSocket) {
                    if (window.WebSocket) {
                        ws =  new WebSocket(opt.url);
                    } else {
                        throw new Error('Error, websocket could not be initialized.');
                    }
                } else {
                    ws = new MozWebSocket(opt.url); 
                }
            }
            return ws;
        },

        _bindSocketEvents: function(ws, opt) {
            var self = this;
            $(ws).bind('open', opt.open)
            .bind('close', opt.close)
            .bind('message', function(event) {
                try {
                    if ('function' === typeof opt.message) {
                        if (self._dataType && 'json' === self._dataType.toLowerCase()) {
                            var json = JSON.parse(event.originalEvent.data);
                            opt.message.call(this, json);
                        } else if (self._dataType && 'xml' === self._dataType.toLowerCase()) {
                            var domParser = new DOMParser();
                            var dom = domParser.parseFromString(event.originalEvent.data, 'text/xml');
                            opt.message.call(this, dom);
                        } else {
                            opt.message.call(this, event.originalEvent.data);
                        }
                    }
                } catch (exception) {
                    if ('function' === typeof opt.error) {
                      opt.error.call(this, exception);
                    }
                }
            }).bind('error', function(exception) {
                if ('function' === typeof opt.error) {
                    opt.error.call(this, exception);
                }
            });
        },

        _webSocket: function(opt) {
           var ws = this._createWebSocket(opt);
           this._bindSocketEvents(ws, opt);

           return ws;
        },

        _getSocketEventHandler: function(attempt) {
            var self = this;
            return {
                open: function(e) {
                    var sock = this;
                    if (attempt) {
                        attempt.resolve(sock);
                    }
                },
                close: function(e) {
                    if (attempt) {
                        attempt.rejectWith(e);
                    }
                },
                message: function(message) {
                    for (var i=0, len=self._listeners.length; i<len; i++) {
                        try {
                            self._listeners[i].deferred.notify.apply(self, [message]);
                        } catch (error) {
                        }
                    }
                },
                error: function(e) {
                    self._ws = null;
                    for (var i=0, len=self._listeners.length; i<len; i++) {
                        self._listeners[i].deferred.reject.apply(self, [e]);
                    }
                    if (attempt) {
                        attempt.rejectWith.apply(self, [e]);
                    }
                }
            };
        },

        _connect: function() {
            var attempt = $.Deferred();

            if (this._ws) {
                if (2 === this._ws.readyState) {
                    // close previous socket
                    this._ws.close();
                } else if (3 === this._ws.readyState) {
                    // close previous socket
                    this._ws.close();
                } else if (0 === this._ws.readyState) {
                    return attempt.promise();
                } else if (1 === this._ws.readyState) {
                    attempt.resolve(this._ws);
                    return attempt.promise();
                }
            }

            this._ws = this._webSocket($.extend(this._opt, this._getSocketEventHandler(attempt)));

            return attempt.promise();
        },

        _reset: function() {
            this._reConnectTries = this._prop(this._opt, 'attempts', 60); // default 10min
            this._reConnectDeferred = $.Deferred();
        },

        _close: function() {
            if (this._ws) {
                this._ws.close();
                this._ws = null;
            }
        },

        _isConnected: function() {
            if (null === this._ws) {
                return false;
            } else if (1 === this._ws.readyState) {
                return true;
            }
            return false;
        },

        _reConnectTry: function() {
            var self = this;
            this._connect().done(function() {
                self._reConnectDeferred.resolve.apply(self, [self._ws]);
            }).fail(function(e) {
                self._reConnectTries--;
                if (self._reConnectTries > 0) {
                    window.setTimeout(function() {
                        self._reConnect.apply(self, []);
                    }, self._prop.apply(self, [self._opt, 'timeout', 10000]));
                } else {
                    self._reConnectDeferred.rejectWith.apply(self, [e]);
                }
            });
        },

        _reConnect: function() {
            var self = this;
            if (null === this._reConnectDeferred) {
                this._reset();
            } else if ('resolved' === this._reConnectDeferred.state()) {
                this._reset();
            } else if ('rejected' === this._reConnectDeferred.state()) {
                this._reset();
            }
            
            if (this._ws && this._ws.readyState === 1) {
                this._reConnectDeferred.resolve(this._ws);
            } else {
                this._reConnectTry();
            }

            return self._reConnectDeferred.promise.apply(self, []);
        },

        _preparePayload: function(data) {
            var payload;
            if (this._opt.dataType && 'text' === this._opt.dataType.toLowerCase()) {
                payload = data;
            } else if (this._opt.dataType && 'xml' === this._opt.dataType.toLowerCase()) {
                payload = data;
            } else if (this._opt.dataType && 'json' === this._opt.dataType.toLowerCase()) {
                payload = JSON.stringify(data);
            } else {
                payload = JSON.stringify(data); // default
            }
            return payload;
        },

        _send: function(data) {
            var self = this;
            var attempt = $.Deferred();

            (function(json) {
                self._reConnect.apply(self, []).done(function(ws) {
                    ws.send(json);
                    attempt.resolve.apply(self, [self._api]);
                }).fail(function(e) {
                    attempt.rejectWith.apply(self, [e]);
                });
            })(this._preparePayload(data));

            return attempt.promise();
        },

        _indexOfListener: function(listener) {
            for (var i=0, len=this._listeners.length; i<len; i++) {
                if (this._listeners[i].listener === listener) {
                    return i;
                }
            }
            return -1;
        },

         _isEmpty: function(obj, property) {
            if (typeof 'undefined' === obj) {
                return true;
            } else if (null === obj) {
                return true;
            } else if ('undefined' === typeof property) {
                return true;
            } else if (null === property) {
                return true;
            } else if ('' === property) {
                return true;
            } else if ('undefined' === typeof obj[property]) {
                return true;
            } else if (null === obj[property]) {
                return true;
            } 
            return false;
         },

        _prop: function(obj, property, defaultValue) {
            if (this._isEmpty(obj, property)) {
                return defaultValue;
            }
            return obj[property];
        },

        _listen: function(listener) {
            var self = this;
            var dInternal = $.Deferred();
             self._reConnect.apply(self, []).done(function() {
                 dInternal.progress(function() {
                     listener.apply(this, arguments);
                 });
                 self._remove.apply(self, [listener]);
                 self._listeners.push({ 'deferred': dInternal, 'listener': listener });
             }).fail(function(e) {
                 dInternal.reject(e);
             });
             return dInternal.promise();
        },

        _listenReconnect: function(listener) {
            var dExternal = $.Deferred();

            var self = this;
            this._listen(listener)
            .fail(function() {
                dExternal.notify(arguments);
                self._listenReconnect.apply(self, [listener]);
            }).done(function() {
                dExternal.resolve();
            });

            return dExternal.promise();
        },

        _remove: function(listener) {
            var index = this._indexOfListener(listener);
            if (0 <= index) {
                this._listeners[index].deferred.resolve();
                this._listeners.splice(index, 1);
            }
        },

        _removeAll: function() {
           for (var i=0, len=this._listeners.length; i<len; i++) {
               this._listeners[i].deferred.resolve();
           }
           this._listeners = [];
        }
     };

    $.extend({
        simpleWebSocket: function(opt) {
            return new SimpleWebSocket(opt);
        }
    });

    return $.simpleWebSocket;
}));