466 lines
12 KiB
JavaScript
466 lines
12 KiB
JavaScript
(function() {
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var JS_WS_CLIENT_TYPE = 'js-websocket';
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var JS_WS_CLIENT_VERSION = '0.0.1';
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var Protocol = window.Protocol;
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var protobuf = window.protobuf;
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var decodeIO_protobuf = window.decodeIO_protobuf;
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var decodeIO_encoder = null;
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var decodeIO_decoder = null;
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var Package = Protocol.Package;
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var Message = Protocol.Message;
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var EventEmitter = window.EventEmitter;
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var rsa = window.rsa;
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if(typeof(window) != "undefined" && typeof(sys) != 'undefined' && sys.localStorage) {
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window.localStorage = sys.localStorage;
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}
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var RES_OK = 200;
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var RES_FAIL = 500;
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var RES_OLD_CLIENT = 501;
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if (typeof Object.create !== 'function') {
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Object.create = function (o) {
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function F() {}
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F.prototype = o;
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return new F();
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};
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}
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var root = window;
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var pomelo = Object.create(EventEmitter.prototype); // object extend from object
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root.pomelo = pomelo;
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var socket = null;
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var reqId = 0;
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var callbacks = {};
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var handlers = {};
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//Map from request id to route
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var routeMap = {};
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var dict = {}; // route string to code
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var abbrs = {}; // code to route string
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var serverProtos = {};
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var clientProtos = {};
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var protoVersion = 0;
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var heartbeatInterval = 0;
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var heartbeatTimeout = 0;
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var nextHeartbeatTimeout = 0;
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var gapThreshold = 100; // heartbeat gap threashold
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var heartbeatId = null;
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var heartbeatTimeoutId = null;
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var handshakeCallback = null;
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var decode = null;
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var encode = null;
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var reconnect = false;
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var reconncetTimer = null;
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var reconnectUrl = null;
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var reconnectAttempts = 0;
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var reconnectionDelay = 5000;
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var DEFAULT_MAX_RECONNECT_ATTEMPTS = 10;
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var useCrypto;
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var handshakeBuffer = {
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'sys': {
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type: JS_WS_CLIENT_TYPE,
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version: JS_WS_CLIENT_VERSION,
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rsa: {}
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},
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'user': {
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}
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};
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var initCallback = null;
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pomelo.init = function(params, cb) {
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initCallback = cb;
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var host = params.host;
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var port = params.port;
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encode = params.encode || defaultEncode;
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decode = params.decode || defaultDecode;
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var url = 'ws://' + host;
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if(port) {
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url += ':' + port;
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}
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handshakeBuffer.user = params.user;
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if(params.encrypt) {
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useCrypto = true;
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rsa.generate(1024, "10001");
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var data = {
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rsa_n: rsa.n.toString(16),
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rsa_e: rsa.e
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}
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handshakeBuffer.sys.rsa = data;
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}
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handshakeCallback = params.handshakeCallback;
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connect(params, url, cb);
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};
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var defaultDecode = pomelo.decode = function(data) {
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//probuff decode
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var msg = Message.decode(data);
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if(msg.id > 0){
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msg.route = routeMap[msg.id];
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delete routeMap[msg.id];
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if(!msg.route){
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return;
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}
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}
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msg.body = deCompose(msg);
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return msg;
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};
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var defaultEncode = pomelo.encode = function(reqId, route, msg) {
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var type = reqId ? Message.TYPE_REQUEST : Message.TYPE_NOTIFY;
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//compress message by protobuf
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if(protobuf && clientProtos[route]) {
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msg = protobuf.encode(route, msg);
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} else if(decodeIO_encoder && decodeIO_encoder.lookup(route)) {
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var Builder = decodeIO_encoder.build(route);
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msg = new Builder(msg).encodeNB();
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} else {
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msg = Protocol.strencode(JSON.stringify(msg));
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}
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var compressRoute = 0;
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if(dict && dict[route]) {
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route = dict[route];
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compressRoute = 1;
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}
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return Message.encode(reqId, type, compressRoute, route, msg);
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};
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var connect = function(params, url, cb) {
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console.log('connect to ' + url);
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var params = params || {};
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var maxReconnectAttempts = params.maxReconnectAttempts || DEFAULT_MAX_RECONNECT_ATTEMPTS;
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reconnectUrl = url;
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//Add protobuf version
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if(window.localStorage && window.localStorage.getItem('protos') && protoVersion === 0) {
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var protos = JSON.parse(window.localStorage.getItem('protos'));
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protoVersion = protos.version || 0;
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serverProtos = protos.server || {};
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clientProtos = protos.client || {};
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if(!!protobuf) {
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protobuf.init({encoderProtos: clientProtos, decoderProtos: serverProtos});
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}
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if(!!decodeIO_protobuf) {
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decodeIO_encoder = decodeIO_protobuf.loadJson(clientProtos);
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decodeIO_decoder = decodeIO_protobuf.loadJson(serverProtos);
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}
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}
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//Set protoversion
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handshakeBuffer.sys.protoVersion = protoVersion;
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var onopen = function(event) {
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if(!!reconnect) {
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pomelo.emit('reconnect');
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}
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reset();
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var obj = Package.encode(Package.TYPE_HANDSHAKE, Protocol.strencode(JSON.stringify(handshakeBuffer)));
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send(obj);
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};
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var onmessage = function(event) {
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processPackage(Package.decode(event.data), cb);
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// new package arrived, update the heartbeat timeout
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if(heartbeatTimeout) {
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nextHeartbeatTimeout = Date.now() + heartbeatTimeout;
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}
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};
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var onerror = function(event) {
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pomelo.emit('io-error', event);
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console.error('socket error: ', event);
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};
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var onclose = function(event) {
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pomelo.emit('close',event);
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pomelo.emit('disconnect', event);
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console.error('socket close: ', event);
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if(!!params.reconnect && reconnectAttempts < maxReconnectAttempts) {
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reconnect = true;
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reconnectAttempts++;
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reconncetTimer = setTimeout(function() {
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connect(params, reconnectUrl, cb);
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}, reconnectionDelay);
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reconnectionDelay *= 2;
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}
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};
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socket = new WebSocket(url);
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socket.binaryType = 'arraybuffer';
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socket.onopen = onopen;
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socket.onmessage = onmessage;
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socket.onerror = onerror;
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socket.onclose = onclose;
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};
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pomelo.disconnect = function() {
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if(socket) {
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if(socket.disconnect) socket.disconnect();
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if(socket.close) socket.close();
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console.log('disconnect');
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socket = null;
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}
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if(heartbeatId) {
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clearTimeout(heartbeatId);
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heartbeatId = null;
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}
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if(heartbeatTimeoutId) {
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clearTimeout(heartbeatTimeoutId);
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heartbeatTimeoutId = null;
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}
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};
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var reset = function() {
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reconnect = false;
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reconnectionDelay = 1000 * 5;
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reconnectAttempts = 0;
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clearTimeout(reconncetTimer);
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};
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pomelo.request = function(route, msg, cb) {
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if(arguments.length === 2 && typeof msg === 'function') {
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cb = msg;
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msg = {};
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} else {
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msg = msg || {};
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}
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route = route || msg.route;
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if(!route) {
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return;
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}
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reqId++;
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sendMessage(reqId, route, msg);
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callbacks[reqId] = cb;
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routeMap[reqId] = route;
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};
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pomelo.notify = function(route, msg) {
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msg = msg || {};
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sendMessage(0, route, msg);
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};
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var sendMessage = function(reqId, route, msg) {
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if(useCrypto) {
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msg = JSON.stringify(msg);
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var sig = rsa.signString(msg, "sha256");
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msg = JSON.parse(msg);
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msg['__crypto__'] = sig;
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}
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if(encode) {
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msg = encode(reqId, route, msg);
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}
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var packet = Package.encode(Package.TYPE_DATA, msg);
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send(packet);
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};
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var send = function(packet) {
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socket.send(packet.buffer);
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};
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var handler = {};
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var heartbeat = function(data) {
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if(!heartbeatInterval) {
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// no heartbeat
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return;
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}
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var obj = Package.encode(Package.TYPE_HEARTBEAT);
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if(heartbeatTimeoutId) {
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clearTimeout(heartbeatTimeoutId);
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heartbeatTimeoutId = null;
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}
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if(heartbeatId) {
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// already in a heartbeat interval
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return;
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}
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heartbeatId = setTimeout(function() {
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heartbeatId = null;
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send(obj);
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nextHeartbeatTimeout = Date.now() + heartbeatTimeout;
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heartbeatTimeoutId = setTimeout(heartbeatTimeoutCb, heartbeatTimeout);
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}, heartbeatInterval);
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};
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var heartbeatTimeoutCb = function() {
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var gap = nextHeartbeatTimeout - Date.now();
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if(gap > gapThreshold) {
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heartbeatTimeoutId = setTimeout(heartbeatTimeoutCb, gap);
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} else {
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console.error('server heartbeat timeout');
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pomelo.emit('heartbeat timeout');
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pomelo.disconnect();
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}
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};
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var handshake = function(data) {
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data = JSON.parse(Protocol.strdecode(data));
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if(data.code === RES_OLD_CLIENT) {
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pomelo.emit('error', 'client version not fullfill');
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return;
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}
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if(data.code !== RES_OK) {
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pomelo.emit('error', 'handshake fail');
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return;
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}
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handshakeInit(data);
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var obj = Package.encode(Package.TYPE_HANDSHAKE_ACK);
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send(obj);
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if(initCallback) {
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initCallback(socket);
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}
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};
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var onData = function(data) {
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var msg = data;
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if(decode) {
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msg = decode(msg);
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}
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processMessage(pomelo, msg);
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};
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var onKick = function(data) {
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data = JSON.parse(Protocol.strdecode(data));
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pomelo.emit('onKick', data);
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};
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handlers[Package.TYPE_HANDSHAKE] = handshake;
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handlers[Package.TYPE_HEARTBEAT] = heartbeat;
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handlers[Package.TYPE_DATA] = onData;
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handlers[Package.TYPE_KICK] = onKick;
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var processPackage = function(msgs) {
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if(Array.isArray(msgs)) {
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for(var i=0; i<msgs.length; i++) {
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var msg = msgs[i];
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handlers[msg.type](msg.body);
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}
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} else {
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handlers[msgs.type](msgs.body);
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}
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};
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var processMessage = function(pomelo, msg) {
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if(!msg.id) {
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// server push message
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pomelo.emit(msg.route, msg.body);
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return;
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}
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//if have a id then find the callback function with the request
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var cb = callbacks[msg.id];
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delete callbacks[msg.id];
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if(typeof cb !== 'function') {
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return;
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}
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cb(msg.body);
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return;
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};
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var processMessageBatch = function(pomelo, msgs) {
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for(var i=0, l=msgs.length; i<l; i++) {
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processMessage(pomelo, msgs[i]);
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}
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};
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var deCompose = function(msg) {
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var route = msg.route;
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//Decompose route from dict
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if(msg.compressRoute) {
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if(!abbrs[route]){
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return {};
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}
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route = msg.route = abbrs[route];
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}
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if(protobuf && serverProtos[route]) {
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return protobuf.decode(route, msg.body);
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} else if(decodeIO_decoder && decodeIO_decoder.lookup(route)) {
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return decodeIO_decoder.build(route).decode(msg.body);
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} else {
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return JSON.parse(Protocol.strdecode(msg.body));
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}
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return msg;
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};
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var handshakeInit = function(data) {
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if(data.sys && data.sys.heartbeat) {
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heartbeatInterval = data.sys.heartbeat * 1000; // heartbeat interval
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heartbeatTimeout = heartbeatInterval * 2; // max heartbeat timeout
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} else {
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heartbeatInterval = 0;
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heartbeatTimeout = 0;
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}
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initData(data);
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if(typeof handshakeCallback === 'function') {
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handshakeCallback(data.user);
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}
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};
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//Initilize data used in pomelo client
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var initData = function(data) {
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if(!data || !data.sys) {
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return;
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}
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dict = data.sys.dict;
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var protos = data.sys.protos;
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//Init compress dict
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if(dict) {
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dict = dict;
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abbrs = {};
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for(var route in dict) {
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abbrs[dict[route]] = route;
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}
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}
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//Init protobuf protos
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if(protos) {
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protoVersion = protos.version || 0;
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serverProtos = protos.server || {};
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clientProtos = protos.client || {};
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//Save protobuf protos to localStorage
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window.localStorage.setItem('protos', JSON.stringify(protos));
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if(!!protobuf) {
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protobuf.init({encoderProtos: protos.client, decoderProtos: protos.server});
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}
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if(!!decodeIO_protobuf) {
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decodeIO_encoder = decodeIO_protobuf.loadJson(clientProtos);
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decodeIO_decoder = decodeIO_protobuf.loadJson(serverProtos);
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}
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}
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};
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module.exports = pomelo;
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})(); |