744 lines
19 KiB
JavaScript
744 lines
19 KiB
JavaScript
/**
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* This code is mostly from the old Etherpad. Please help us to comment this code.
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* This helps other people to understand this code better and helps them to improve it.
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* TL;DR COMMENTS ON THIS FILE ARE HIGHLY APPRECIATED
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*/
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/**
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* Copyright 2009 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS-IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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var chat = require('./chat').chat;
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var hooks = require('./pluginfw/hooks');
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// Dependency fill on init. This exists for `pad.socket` only.
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// TODO: bind directly to the socket.
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var pad = undefined;
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function getSocket() {
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return pad && pad.socket;
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}
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/** Call this when the document is ready, and a new Ace2Editor() has been created and inited.
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ACE's ready callback does not need to have fired yet.
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"serverVars" are from calling doc.getCollabClientVars() on the server. */
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function getCollabClient(ace2editor, serverVars, initialUserInfo, options, _pad)
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{
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var editor = ace2editor;
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pad = _pad; // Inject pad to avoid a circular dependency.
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var rev = serverVars.rev;
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var padId = serverVars.padId;
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var state = "IDLE";
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var stateMessage;
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var channelState = "CONNECTING";
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var appLevelDisconnectReason = null;
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var lastCommitTime = 0;
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var initialStartConnectTime = 0;
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var userId = initialUserInfo.userId;
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//var socket;
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var userSet = {}; // userId -> userInfo
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userSet[userId] = initialUserInfo;
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var caughtErrors = [];
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var caughtErrorCatchers = [];
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var caughtErrorTimes = [];
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var debugMessages = [];
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var msgQueue = [];
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var socketIOError = false;
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tellAceAboutHistoricalAuthors(serverVars.historicalAuthorData);
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tellAceActiveAuthorInfo(initialUserInfo);
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var callbacks = {
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onUserJoin: function()
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{},
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onUserLeave: function()
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{},
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onUpdateUserInfo: function()
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{},
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onChannelStateChange: function()
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{},
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onClientMessage: function()
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{},
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onInternalAction: function()
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{},
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onConnectionTrouble: function()
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{},
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onServerMessage: function()
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{}
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};
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if (browser.firefox)
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{
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// Prevent "escape" from taking effect and canceling a comet connection;
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// doesn't work if focus is on an iframe.
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$(window).bind("keydown", function(evt)
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{
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if (evt.which == 27)
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{
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evt.preventDefault()
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}
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});
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}
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editor.setProperty("userAuthor", userId);
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editor.setBaseAttributedText(serverVars.initialAttributedText, serverVars.apool);
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editor.setUserChangeNotificationCallback(wrapRecordingErrors("handleUserChanges", handleUserChanges));
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function dmesg(str)
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{
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if (typeof window.ajlog == "string") window.ajlog += str + '\n';
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debugMessages.push(str);
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}
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function handleUserChanges()
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{
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if (editor.getInInternationalComposition()) return;
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if ((!getSocket()) || channelState == "CONNECTING")
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{
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if (channelState == "CONNECTING" && (((+new Date()) - initialStartConnectTime) > 20000))
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{
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setChannelState("DISCONNECTED", "initsocketfail");
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}
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else
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{
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// check again in a bit
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setTimeout(wrapRecordingErrors("setTimeout(handleUserChanges)", handleUserChanges), 1000);
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}
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return;
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}
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var t = (+new Date());
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if (state != "IDLE")
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{
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if (state == "COMMITTING" && msgQueue.length == 0 && (t - lastCommitTime) > 20000)
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{
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// a commit is taking too long
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setChannelState("DISCONNECTED", "slowcommit");
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}
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else if (state == "COMMITTING" && msgQueue.length == 0 && (t - lastCommitTime) > 5000)
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{
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callbacks.onConnectionTrouble("SLOW");
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}
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else
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{
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// run again in a few seconds, to detect a disconnect
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setTimeout(wrapRecordingErrors("setTimeout(handleUserChanges)", handleUserChanges), 3000);
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}
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return;
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}
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var earliestCommit = lastCommitTime + 500;
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if (t < earliestCommit)
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{
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setTimeout(wrapRecordingErrors("setTimeout(handleUserChanges)", handleUserChanges), earliestCommit - t);
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return;
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}
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// apply msgQueue changeset.
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if (msgQueue.length != 0) {
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var msg;
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while (msg = msgQueue.shift()) {
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var newRev = msg.newRev;
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rev=newRev;
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if (msg.type == "ACCEPT_COMMIT")
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{
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editor.applyPreparedChangesetToBase();
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setStateIdle();
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callCatchingErrors("onInternalAction", function()
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{
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callbacks.onInternalAction("commitAcceptedByServer");
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});
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callCatchingErrors("onConnectionTrouble", function()
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{
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callbacks.onConnectionTrouble("OK");
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});
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handleUserChanges();
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}
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else if (msg.type == "NEW_CHANGES")
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{
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var changeset = msg.changeset;
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var author = (msg.author || '');
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var apool = msg.apool;
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editor.applyChangesToBase(changeset, author, apool);
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}
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}
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}
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var sentMessage = false;
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if (getSocket().realConnected && !socketIOError)
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{
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var userChangesData = editor.prepareUserChangeset();
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if (userChangesData.changeset)
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{
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lastCommitTime = t;
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state = "COMMITTING";
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stateMessage = {
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type: "USER_CHANGES",
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baseRev: rev,
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changeset: userChangesData.changeset,
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apool: userChangesData.apool
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};
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sendMessage(stateMessage);
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sentMessage = true;
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callbacks.onInternalAction("commitPerformed");
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}
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}
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else
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{
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// run again in a few seconds, to detect a reconnect
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setTimeout(wrapRecordingErrors("setTimeout(handleUserChanges)", handleUserChanges), 3000);
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}
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if (sentMessage)
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{
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// run again in a few seconds, to detect a disconnect
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setTimeout(wrapRecordingErrors("setTimeout(handleUserChanges)", handleUserChanges), 3000);
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}
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}
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function setUpSocket()
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{
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hiccupCount = 0;
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setChannelState("CONNECTED");
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doDeferredActions();
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initialStartConnectTime = +new Date();
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}
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var hiccupCount = 0;
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function sendMessage(msg)
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{
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getSocket().json.send(
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{
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type: "COLLABROOM",
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component: "pad",
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data: msg
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});
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}
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function wrapRecordingErrors(catcher, func)
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{
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return function()
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{
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try
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{
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return func.apply(this, Array.prototype.slice.call(arguments));
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}
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catch (e)
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{
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caughtErrors.push(e);
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caughtErrorCatchers.push(catcher);
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caughtErrorTimes.push(+new Date());
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//console.dir({catcher: catcher, e: e});
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throw e;
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}
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};
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}
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function callCatchingErrors(catcher, func)
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{
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try
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{
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wrapRecordingErrors(catcher, func)();
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}
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catch (e)
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{ /*absorb*/
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}
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}
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function handleMessageFromServer(evt)
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{
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if (window.console) console.log(evt);
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if (!getSocket()) return;
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if (!evt.data) return;
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var wrapper = evt;
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if (wrapper.type != "COLLABROOM" && wrapper.type != "CUSTOM") return;
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var msg = wrapper.data;
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if (msg.type == "NEW_CHANGES")
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{
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var newRev = msg.newRev;
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var changeset = msg.changeset;
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var author = (msg.author || '');
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var apool = msg.apool;
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// When inInternationalComposition, msg pushed msgQueue.
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if (msgQueue.length > 0 || editor.getInInternationalComposition()) {
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if (msgQueue.length > 0) var oldRev = msgQueue[msgQueue.length - 1].newRev;
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else oldRev = rev;
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if (newRev != (oldRev + 1))
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{
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window.console.warn("bad message revision on NEW_CHANGES: " + newRev + " not " + (oldRev + 1));
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// setChannelState("DISCONNECTED", "badmessage_newchanges");
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return;
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}
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msgQueue.push(msg);
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return;
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}
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if (newRev != (rev + 1))
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{
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window.console.warn("bad message revision on NEW_CHANGES: " + newRev + " not " + (rev + 1));
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// setChannelState("DISCONNECTED", "badmessage_newchanges");
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return;
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}
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rev = newRev;
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editor.applyChangesToBase(changeset, author, apool);
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}
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else if (msg.type == "ACCEPT_COMMIT")
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{
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var newRev = msg.newRev;
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if (msgQueue.length > 0)
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{
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if (newRev != (msgQueue[msgQueue.length - 1].newRev + 1))
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{
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window.console.warn("bad message revision on ACCEPT_COMMIT: " + newRev + " not " + (msgQueue[msgQueue.length - 1][0] + 1));
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// setChannelState("DISCONNECTED", "badmessage_acceptcommit");
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return;
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}
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msgQueue.push(msg);
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return;
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}
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if (newRev != (rev + 1))
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{
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window.console.warn("bad message revision on ACCEPT_COMMIT: " + newRev + " not " + (rev + 1));
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// setChannelState("DISCONNECTED", "badmessage_acceptcommit");
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return;
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}
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rev = newRev;
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editor.applyPreparedChangesetToBase();
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setStateIdle();
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callCatchingErrors("onInternalAction", function()
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{
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callbacks.onInternalAction("commitAcceptedByServer");
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});
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callCatchingErrors("onConnectionTrouble", function()
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{
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callbacks.onConnectionTrouble("OK");
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});
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handleUserChanges();
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}
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else if (msg.type == 'CLIENT_RECONNECT')
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{
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// When client has reconnected but there are no pending changes from other clients
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if (msg.noChanges)
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{
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socketIOError = false;
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return;
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}
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var headRev = msg.headRev;
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var newRev = msg.newRev;
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var changeset = msg.changeset;
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var author = (msg.author || '');
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var apool = msg.apool;
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if (msgQueue.length > 0)
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{
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if (newRev != (msgQueue[msgQueue.length - 1].newRev + 1))
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{
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window.console.warn("bad message revision on ACCEPT_COMMIT: " + newRev + " not " + (msgQueue[msgQueue.length - 1][0] + 1));
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// setChannelState("DISCONNECTED", "badmessage_acceptcommit");
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return;
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}
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msg.type = "NEW_CHANGES";
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msgQueue.push(msg);
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return;
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}
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if (newRev != (rev + 1))
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{
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window.console.warn("bad message revision on ACCEPT_COMMIT: " + newRev + " not " + (rev + 1));
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// setChannelState("DISCONNECTED", "badmessage_acceptcommit");
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return;
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}
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rev = newRev;
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if (author == pad.getUserId())
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{
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editor.applyPreparedChangesetToBase();
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setStateIdle();
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callCatchingErrors("onInternalAction", function()
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{
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callbacks.onInternalAction("commitAcceptedByServer");
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});
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callCatchingErrors("onConnectionTrouble", function()
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{
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callbacks.onConnectionTrouble("OK");
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});
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handleUserChanges();
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}
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else
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{
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editor.applyChangesToBase(changeset, author, apool);
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}
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if (newRev == headRev)
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{
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rev = newRev;
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socketIOError = false;
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}
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}
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else if (msg.type == "NO_COMMIT_PENDING")
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{
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if (state == "COMMITTING")
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{
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// server missed our commit message; abort that commit
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setStateIdle();
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handleUserChanges();
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}
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}
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else if (msg.type == "USER_NEWINFO")
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{
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var userInfo = msg.userInfo;
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var id = userInfo.userId;
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// Avoid a race condition when setting colors. If our color was set by a
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// query param, ignore our own "new user" message's color value.
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if (id === initialUserInfo.userId && initialUserInfo.globalUserColor)
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{
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msg.userInfo.colorId = initialUserInfo.globalUserColor;
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}
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if (userSet[id])
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{
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userSet[id] = userInfo;
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callbacks.onUpdateUserInfo(userInfo);
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}
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else
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{
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userSet[id] = userInfo;
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callbacks.onUserJoin(userInfo);
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}
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tellAceActiveAuthorInfo(userInfo);
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}
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else if (msg.type == "USER_LEAVE")
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{
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var userInfo = msg.userInfo;
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var id = userInfo.userId;
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if (userSet[id])
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{
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delete userSet[userInfo.userId];
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fadeAceAuthorInfo(userInfo);
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callbacks.onUserLeave(userInfo);
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}
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}
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else if (msg.type == "DISCONNECT_REASON")
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{
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appLevelDisconnectReason = msg.reason;
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}
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else if (msg.type == "CLIENT_MESSAGE")
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{
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callbacks.onClientMessage(msg.payload);
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}
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else if (msg.type == "CHAT_MESSAGE")
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{
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chat.addMessage(msg, true, false);
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}
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else if (msg.type == "CHAT_MESSAGES")
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{
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for(var i = msg.messages.length - 1; i >= 0; i--)
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{
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chat.addMessage(msg.messages[i], true, true);
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}
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if(!chat.gotInitalMessages)
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{
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chat.scrollDown();
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chat.gotInitalMessages = true;
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chat.historyPointer = clientVars.chatHead - msg.messages.length;
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}
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// messages are loaded, so hide the loading-ball
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$("#chatloadmessagesball").css("display", "none");
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// there are less than 100 messages or we reached the top
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if(chat.historyPointer <= 0)
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$("#chatloadmessagesbutton").css("display", "none");
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else // there are still more messages, re-show the load-button
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$("#chatloadmessagesbutton").css("display", "block");
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}
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else if (msg.type == "SERVER_MESSAGE")
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{
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callbacks.onServerMessage(msg.payload);
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}
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//HACKISH: User messages do not have "payload" but "userInfo", so that all "handleClientMessage_USER_" hooks would work, populate payload
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//FIXME: USER_* messages to have "payload" property instead of "userInfo", seems like a quite a big work
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if(msg.type.indexOf("USER_") > -1) {
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msg.payload = msg.userInfo;
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}
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hooks.callAll('handleClientMessage_' + msg.type, {payload: msg.payload});
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}
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function updateUserInfo(userInfo)
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{
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userInfo.userId = userId;
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userSet[userId] = userInfo;
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tellAceActiveAuthorInfo(userInfo);
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if (!getSocket()) return;
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sendMessage(
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{
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type: "USERINFO_UPDATE",
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userInfo: userInfo
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});
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}
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function tellAceActiveAuthorInfo(userInfo)
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{
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tellAceAuthorInfo(userInfo.userId, userInfo.colorId);
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}
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function tellAceAuthorInfo(userId, colorId, inactive)
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{
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if(typeof colorId == "number")
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{
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colorId = clientVars.colorPalette[colorId];
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}
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var cssColor = colorId;
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if (inactive)
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{
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editor.setAuthorInfo(userId, {
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bgcolor: cssColor,
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fade: 0.5
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});
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}
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else
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{
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editor.setAuthorInfo(userId, {
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bgcolor: cssColor
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});
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}
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}
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function fadeAceAuthorInfo(userInfo)
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{
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tellAceAuthorInfo(userInfo.userId, userInfo.colorId, true);
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}
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function getConnectedUsers()
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{
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return valuesArray(userSet);
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}
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function tellAceAboutHistoricalAuthors(hadata)
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{
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for (var author in hadata)
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{
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var data = hadata[author];
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if (!userSet[author])
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{
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tellAceAuthorInfo(author, data.colorId, true);
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}
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}
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}
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function setChannelState(newChannelState, moreInfo)
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{
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if (newChannelState != channelState)
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{
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channelState = newChannelState;
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callbacks.onChannelStateChange(channelState, moreInfo);
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}
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}
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function valuesArray(obj)
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{
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var array = [];
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$.each(obj, function(k, v)
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{
|
|
array.push(v);
|
|
});
|
|
return array;
|
|
}
|
|
|
|
// We need to present a working interface even before the socket
|
|
// is connected for the first time.
|
|
var deferredActions = [];
|
|
|
|
function defer(func, tag)
|
|
{
|
|
return function()
|
|
{
|
|
var that = this;
|
|
var args = arguments;
|
|
|
|
function action()
|
|
{
|
|
func.apply(that, args);
|
|
}
|
|
action.tag = tag;
|
|
if (channelState == "CONNECTING")
|
|
{
|
|
deferredActions.push(action);
|
|
}
|
|
else
|
|
{
|
|
action();
|
|
}
|
|
}
|
|
}
|
|
|
|
function doDeferredActions(tag)
|
|
{
|
|
var newArray = [];
|
|
for (var i = 0; i < deferredActions.length; i++)
|
|
{
|
|
var a = deferredActions[i];
|
|
if ((!tag) || (tag == a.tag))
|
|
{
|
|
a();
|
|
}
|
|
else
|
|
{
|
|
newArray.push(a);
|
|
}
|
|
}
|
|
deferredActions = newArray;
|
|
}
|
|
|
|
function sendClientMessage(msg)
|
|
{
|
|
sendMessage(
|
|
{
|
|
type: "CLIENT_MESSAGE",
|
|
payload: msg
|
|
});
|
|
}
|
|
|
|
function getCurrentRevisionNumber()
|
|
{
|
|
return rev;
|
|
}
|
|
|
|
function getMissedChanges()
|
|
{
|
|
var obj = {};
|
|
obj.userInfo = userSet[userId];
|
|
obj.baseRev = rev;
|
|
if (state == "COMMITTING" && stateMessage)
|
|
{
|
|
obj.committedChangeset = stateMessage.changeset;
|
|
obj.committedChangesetAPool = stateMessage.apool;
|
|
editor.applyPreparedChangesetToBase();
|
|
}
|
|
var userChangesData = editor.prepareUserChangeset();
|
|
if (userChangesData.changeset)
|
|
{
|
|
obj.furtherChangeset = userChangesData.changeset;
|
|
obj.furtherChangesetAPool = userChangesData.apool;
|
|
}
|
|
return obj;
|
|
}
|
|
|
|
function setStateIdle()
|
|
{
|
|
state = "IDLE";
|
|
callbacks.onInternalAction("newlyIdle");
|
|
schedulePerhapsCallIdleFuncs();
|
|
}
|
|
|
|
function setSocketIOError(value)
|
|
{
|
|
socketIOError = value;
|
|
}
|
|
function callWhenNotCommitting(func)
|
|
{
|
|
idleFuncs.push(func);
|
|
schedulePerhapsCallIdleFuncs();
|
|
}
|
|
|
|
var idleFuncs = [];
|
|
|
|
function schedulePerhapsCallIdleFuncs()
|
|
{
|
|
setTimeout(function()
|
|
{
|
|
if (state == "IDLE")
|
|
{
|
|
while (idleFuncs.length > 0)
|
|
{
|
|
var f = idleFuncs.shift();
|
|
f();
|
|
}
|
|
}
|
|
}, 0);
|
|
}
|
|
|
|
var self = {
|
|
setOnUserJoin: function(cb)
|
|
{
|
|
callbacks.onUserJoin = cb;
|
|
},
|
|
setOnUserLeave: function(cb)
|
|
{
|
|
callbacks.onUserLeave = cb;
|
|
},
|
|
setOnUpdateUserInfo: function(cb)
|
|
{
|
|
callbacks.onUpdateUserInfo = cb;
|
|
},
|
|
setOnChannelStateChange: function(cb)
|
|
{
|
|
callbacks.onChannelStateChange = cb;
|
|
},
|
|
setOnClientMessage: function(cb)
|
|
{
|
|
callbacks.onClientMessage = cb;
|
|
},
|
|
setOnInternalAction: function(cb)
|
|
{
|
|
callbacks.onInternalAction = cb;
|
|
},
|
|
setOnConnectionTrouble: function(cb)
|
|
{
|
|
callbacks.onConnectionTrouble = cb;
|
|
},
|
|
setOnServerMessage: function(cb)
|
|
{
|
|
callbacks.onServerMessage = cb;
|
|
},
|
|
updateUserInfo: defer(updateUserInfo),
|
|
handleMessageFromServer: handleMessageFromServer,
|
|
getConnectedUsers: getConnectedUsers,
|
|
sendClientMessage: sendClientMessage,
|
|
sendMessage: sendMessage,
|
|
getCurrentRevisionNumber: getCurrentRevisionNumber,
|
|
getMissedChanges: getMissedChanges,
|
|
callWhenNotCommitting: callWhenNotCommitting,
|
|
addHistoricalAuthors: tellAceAboutHistoricalAuthors,
|
|
setChannelState: setChannelState,
|
|
setStateIdle: setStateIdle,
|
|
setSocketIOError: setSocketIOError
|
|
};
|
|
|
|
$(document).ready(setUpSocket);
|
|
return self;
|
|
}
|
|
|
|
exports.getCollabClient = getCollabClient;
|