egroupware/api/js/webodf/collab/backend/pullbox/OperationRouter.js

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/**
* Copyright (C) 2013 KO GmbH <copyright@kogmbh.com>
*
* @licstart
* This file is part of WebODF.
*
* WebODF is free software: you can redistribute it and/or modify it
* under the terms of the GNU Affero General Public License (GNU AGPL)
* as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* WebODF is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with WebODF. If not, see <http://www.gnu.org/licenses/>.
* @licend
*
* @source: http://www.webodf.org/
* @source: https://github.com/kogmbh/WebODF/
*/
/*global define, runtime, core, ops*/
define("webodf/editor/backend/pullbox/OperationRouter", [], function () {
"use strict";
// TODO: these eventid strings should be defined at OperationRouter interface
var /**@const @type {!string}*/
EVENT_BEFORESAVETOFILE = "beforeSaveToFile",
/**@const @type {!string}*/
EVENT_SAVEDTOFILE = "savedToFile",
/**@const @type {!string}*/
EVENT_HASLOCALUNSYNCEDOPERATIONSCHANGED = "hasLocalUnsyncedOperationsChanged",
/**@const @type {!string}*/
EVENT_HASSESSIONHOSTCONNECTIONCHANGED = "hasSessionHostConnectionChanged";
runtime.loadClass("ops.OperationTransformer");
runtime.loadClass("core.EventNotifier");
/**
* route operations in a networked collaborative manner.
*
* incoming operations (from controller) are sent to a server,
* who will distribute them.
*
* incoming operations (from the server are played on the DOM.
*/
/**
* @constructor
* @implements ops.OperationRouter
*/
return function PullBoxOperationRouter(sessionId, memberId, server, odfContainer, errorCallback) {
var operationFactory,
/**@type{function(!ops.Operation):boolean}*/
playbackFunction,
idleTimeout = null,
syncOpsTimeout = null,
/**@type{!boolean}*/
isInstantSyncRequested = false,
/**@type{!boolean}*/
isPlayingUnplayedServerOpSpecs = false,
/**@type{!boolean}*/
isSyncCallRunning = false,
/**@type{!boolean}*/
hasError = false,
/**@type{!boolean}*/
syncingBlocked = false,
/** @type {!string} id of latest op stack state known on the server */
lastServerSeq = "",
/** @type {!Array.<!Function>} sync request callbacks created since the last sync call to the server */
syncRequestCallbacksQueue = [],
/** @type {!Array.<!Object>} ops created since the last sync call to the server */
unsyncedClientOpspecQueue = [],
/** @type {!Array.<!Object>} ops already received from the server but not yet applied */
unplayedServerOpspecQueue = [],
/** @type {!Array.<!Function>} sync request callbacks which should be called after the received ops have been applied server */
uncalledSyncRequestCallbacksQueue = [],
/**@type{!boolean}*/
hasLocalUnsyncedOps = false,
/**@type{!boolean}*/
hasSessionHostConnection = true,
eventNotifier = new core.EventNotifier([
EVENT_BEFORESAVETOFILE,
EVENT_SAVEDTOFILE,
EVENT_HASLOCALUNSYNCEDOPERATIONSCHANGED,
EVENT_HASSESSIONHOSTCONNECTIONCHANGED,
ops.OperationRouter.signalProcessingBatchStart,
ops.OperationRouter.signalProcessingBatchEnd
]),
/**@type{!boolean} tells if any local ops have been modifying ops */
hasPushedModificationOps = false,
operationTransformer = new ops.OperationTransformer(),
/**@const*/replayTime = 500,
/**@const*/syncOpsDelay = 3000,
/**@const*/idleDelay = 5000;
/**
* @return {undefined}
*/
function updateHasLocalUnsyncedOpsState() {
var hasLocalUnsyncedOpsNow = (unsyncedClientOpspecQueue.length > 0);
// no change?
if (hasLocalUnsyncedOps === hasLocalUnsyncedOpsNow) {
return;
}
hasLocalUnsyncedOps = hasLocalUnsyncedOpsNow;
eventNotifier.emit(EVENT_HASLOCALUNSYNCEDOPERATIONSCHANGED, hasLocalUnsyncedOps);
}
/**
* @param {!boolean} hasConnection
* @return {undefined}
*/
function updateHasSessionHostConnectionState(hasConnection) {
// no change?
if (hasSessionHostConnection === hasConnection) {
return;
}
hasSessionHostConnection = hasConnection;
eventNotifier.emit(EVENT_HASSESSIONHOSTCONNECTIONCHANGED, hasSessionHostConnection);
}
/**
* @return {undefined}
*/
function playUnplayedServerOpSpecs() {
/**
* @return {undefined}
*/
function doPlayUnplayedServerOpSpecs() {
var opspec, op, startTime, i;
isPlayingUnplayedServerOpSpecs = false;
// take start time
startTime = Date.now();
eventNotifier.emit(ops.OperationRouter.signalProcessingBatchStart, {});
// apply as much as possible in the given time
while (unplayedServerOpspecQueue.length > 0) {
// time over?
if (Date.now() - startTime > replayTime) {
break;
}
opspec = unplayedServerOpspecQueue.shift();
// use factory to create an instance, and playback!
op = operationFactory.create(opspec);
runtime.log(" op in: "+runtime.toJson(opspec));
if (op !== null) {
if (!playbackFunction(op)) {
eventNotifier.emit(ops.OperationRouter.signalProcessingBatchEnd, {});
hasError = true;
errorCallback("opExecutionFailure");
return;
}
} else {
eventNotifier.emit(ops.OperationRouter.signalProcessingBatchEnd, {});
hasError = true;
runtime.log("ignoring invalid incoming opspec: " + opspec);
errorCallback("unknownOpReceived");
return;
}
}
eventNotifier.emit(ops.OperationRouter.signalProcessingBatchEnd, {});
// still unplayed opspecs?
if (unplayedServerOpspecQueue.length > 0) {
// let other events be handled. then continue
isPlayingUnplayedServerOpSpecs = true;
runtime.getWindow().setTimeout(doPlayUnplayedServerOpSpecs, 1);
} else {
// finally call all the callbacks waiting for that sync!
for (i = 0; i < uncalledSyncRequestCallbacksQueue.length; i += 1) {
uncalledSyncRequestCallbacksQueue[i]();
}
uncalledSyncRequestCallbacksQueue = [];
}
}
if (isPlayingUnplayedServerOpSpecs) {
return;
}
doPlayUnplayedServerOpSpecs();
}
/**
* @param {Array.<!Object>} opspecs
* @param {Array.<!Function>} callbacks
* @return {undefined}
*/
function receiveOpSpecsFromNetwork(opspecs, callbacks) {
// append to existing unplayed
unplayedServerOpspecQueue = unplayedServerOpspecQueue.concat(opspecs);
uncalledSyncRequestCallbacksQueue = uncalledSyncRequestCallbacksQueue.concat(callbacks);
}
/**
* Transforms the unsynced client ops and the server ops,
* applies the server ops after transformation
* @param {Array.<!Object>} serverOpspecs
* @return {!boolean}
*/
function handleOpsSyncConflict(serverOpspecs) {
var i,
transformResult;
if (! serverOpspecs) {
// TODO: proper error message, stop working
runtime.BrowserRuntime$assert(false, "no opspecs received!");
return false;
} // TODO: more checking of proper content in serverOpspecs
transformResult = operationTransformer.transform(unsyncedClientOpspecQueue, /**@type{!Array.<!Object>}*/(serverOpspecs));
if (!transformResult) {
return false;
}
// store transformed server ops
for (i = 0; i < transformResult.opSpecsB.length; i += 1) {
unplayedServerOpspecQueue.push(transformResult.opSpecsB[i]);
}
// store opspecs of all transformed client opspecs
unsyncedClientOpspecQueue = [];
for (i = 0; i < transformResult.opSpecsA.length; i += 1) {
unsyncedClientOpspecQueue.push(transformResult.opSpecsA[i]);
}
return true;
}
/**
* @return {undefined}
*/
function syncOps() {
var syncedClientOpspecs,
syncRequestCallbacksArray;
/**
* @return {undefined}
*/
function startSyncOpsTimeout() {
idleTimeout = null;
syncOpsTimeout = runtime.getWindow().setTimeout(function() {
syncOpsTimeout = null;
syncOps();
}, syncOpsDelay);
}
if (isSyncCallRunning || hasError) {
return;
}
// TODO: hack, remove
if (syncingBlocked) {
return;
}
runtime.log("OperationRouter: sending sync_ops call");
// no more instant pull request in any case
isInstantSyncRequested = false;
// set lock
isSyncCallRunning = true;
// take specs from queue, if any
syncedClientOpspecs = unsyncedClientOpspecQueue;
unsyncedClientOpspecQueue = [];
syncRequestCallbacksArray = syncRequestCallbacksQueue;
syncRequestCallbacksQueue = [];
server.call({
command: 'sync_ops',
args: {
es_id: sessionId,
member_id: memberId,
seq_head: String(lastServerSeq),
client_ops: syncedClientOpspecs
}
}, function(responseData) {
var response,
/**@type{!boolean}*/
hasUnresolvableConflict = false;
updateHasSessionHostConnectionState(true);
if (syncingBlocked) {
return;
}
try {
response = /** @type{{result:string, head_seq:string, ops:Array.<!Object>}} */(runtime.fromJson(responseData));
} catch (e) {
hasError = true;
runtime.log("Could not parse reply: "+responseData);
errorCallback("unknownServerReply");
return;
}
// TODO: hack, remove
runtime.log("sync_ops reply: " + responseData);
// just new ops?
if (response.result === "new_ops") {
if (response.ops.length > 0) {
// no new locally in the meantime?
if (unsyncedClientOpspecQueue.length === 0) {
receiveOpSpecsFromNetwork(response.ops, syncRequestCallbacksArray);
} else {
// transform server ops against new local ones and apply,
// transform and send new local ops to server
runtime.log("meh, have new ops locally meanwhile, have to do transformations.");
hasUnresolvableConflict = !handleOpsSyncConflict(response.ops);
syncRequestCallbacksQueue = syncRequestCallbacksArray.concat(syncRequestCallbacksQueue);
}
// and note server state
lastServerSeq = response.head_seq;
} else {
receiveOpSpecsFromNetwork([], syncRequestCallbacksArray);
}
} else if (response.result === "added") {
runtime.log("All added to server");
receiveOpSpecsFromNetwork([], syncRequestCallbacksArray);
// note server state
lastServerSeq = response.head_seq;
updateHasLocalUnsyncedOpsState();
} else if (response.result === "conflict") {
// put the send ops back into the outgoing queue
unsyncedClientOpspecQueue = syncedClientOpspecs.concat(unsyncedClientOpspecQueue);
syncRequestCallbacksQueue = syncRequestCallbacksArray.concat(syncRequestCallbacksQueue);
// transform server ops against new local ones and apply,
// transform and request new send new local ops to server
runtime.log("meh, server has new ops meanwhile, have to do transformations.");
hasUnresolvableConflict = !handleOpsSyncConflict(response.ops);
// and note server state
lastServerSeq = response.head_seq;
// try again instantly
if (!hasUnresolvableConflict) {
isInstantSyncRequested = true;
}
} else if (response.result === "error") {
runtime.log("server reports an error: "+response.error);
hasError = true;
errorCallback(
response.error === "ENOSESSION" ? "sessionDoesNotExist":
response.error === "ENOMEMBER" ? "notMemberOfSession":
"unknownServerReply"
);
} else {
hasError = true;
runtime.log("Unexpected result on sync-ops call: "+response.result);
errorCallback("unknownServerReply");
}
if (hasError) {
return;
}
// unlock
isSyncCallRunning = false;
if (hasUnresolvableConflict) {
hasError = true;
errorCallback("unresolvableConflictingOps");
} else {
// prepare next sync
if (isInstantSyncRequested) {
syncOps();
} else {
// nothing on client to sync?
if (unsyncedClientOpspecQueue.length === 0) {
idleTimeout = runtime.getWindow().setTimeout(startSyncOpsTimeout, idleDelay);
} else {
startSyncOpsTimeout();
}
}
playUnplayedServerOpSpecs();
}
}, function() {
runtime.log("meh, server cannot be reached ATM.");
// signal connection problem, but do not give up for now
updateHasSessionHostConnectionState(false);
// put the (not) send ops back into the outgoing queue
unsyncedClientOpspecQueue = syncedClientOpspecs.concat(unsyncedClientOpspecQueue);
syncRequestCallbacksQueue = syncRequestCallbacksArray.concat(syncRequestCallbacksQueue);
// unlock
isSyncCallRunning = false;
// nothing on client to sync?
if (unsyncedClientOpspecQueue.length === 0) {
idleTimeout = runtime.getWindow().setTimeout(startSyncOpsTimeout, idleDelay);
} else {
startSyncOpsTimeout();
}
playUnplayedServerOpSpecs();
});
}
function triggerPushingOps() {
// disable any idle timeout
if (idleTimeout) {
runtime.clearTimeout(idleTimeout);
idleTimeout = null;
}
// enable syncOps timeout, if needed
if (!syncOpsTimeout && !isSyncCallRunning) {
runtime.log("OperationRouter: opsSync requested for pushing");
syncOpsTimeout = runtime.getWindow().setTimeout(function() {
syncOpsTimeout = null;
syncOps();
}, syncOpsDelay);
}
}
/**
* @param {!Funtion} cb
* @return {undefined}
*/
function requestInstantOpsSync(cb) {
// register callback
syncRequestCallbacksQueue.push(cb);
// disable any idle timeout
if (idleTimeout) {
runtime.clearTimeout(idleTimeout);
idleTimeout = null;
}
// disable any syncOps timeout
if (syncOpsTimeout) {
runtime.clearTimeout(syncOpsTimeout);
syncOpsTimeout = null;
}
runtime.log("OperationRouter: instant opsSync requested");
isInstantSyncRequested = true;
syncOps();
}
this.requestReplay = function (done_cb) {
requestInstantOpsSync(done_cb);
};
/**
* Sets the factory to use to create operation instances from operation specs.
*
* @param {!ops.OperationFactory} f
* @return {undefined}
*/
this.setOperationFactory = function (f) {
operationFactory = f;
};
/**
* Sets the method which should be called to apply operations.
*
* @param {!function(!ops.Operation):boolean} playback_func
* @return {undefined}
*/
this.setPlaybackFunction = function (playback_func) {
playbackFunction = playback_func;
};
/**
* Brings the locally created operations into the game.
*
* @param {!Array.<!ops.Operation>} operations
* @return {undefined}
*/
this.push = function (operations) {
var i, op, opspec,
timestamp = Date.now();
if (hasError) {
return;
}
// TODO: should be an assert in the future
// there needs to be a flag telling that processing is happening,
// and thus any input should be dropped in the sessioncontroller
// ideally also have some UI element showing the processing state
if (unplayedServerOpspecQueue.length > 0) {
return;
}
eventNotifier.emit(ops.OperationRouter.signalProcessingBatchStart, {});
for (i = 0; i < operations.length; i += 1) {
op = operations[i];
opspec = op.spec();
// note if any local ops modified
hasPushedModificationOps = hasPushedModificationOps || op.isEdit;
// add timestamp TODO: improve the useless recreation of the op
opspec.timestamp = timestamp;
op = operationFactory.create(opspec);
// apply locally
if (!playbackFunction(op)) {
hasError = true;
errorCallback("opExecutionFailure");
return;
}
// send to server
unsyncedClientOpspecQueue.push(opspec);
}
triggerPushingOps();
updateHasLocalUnsyncedOpsState();
eventNotifier.emit(ops.OperationRouter.signalProcessingBatchEnd, {});
};
/**
* Requests a gracefull shutdown of the Operation Router.
* Buffered operations shall be sent to the server.
* A callback is called on success.
*/
this.close = function (cb) {
function cbDoneSaving(err) {
eventNotifier.emit(EVENT_SAVEDTOFILE, null);
cb(err);
}
function cbSuccess(fileData) {
server.writeSessionStateToFile(sessionId, memberId, lastServerSeq, fileData, cbDoneSaving);
}
function doClose() {
syncingBlocked = true;
if (hasPushedModificationOps) {
eventNotifier.emit(EVENT_BEFORESAVETOFILE, null);
odfContainer.createByteArray(cbSuccess, cbDoneSaving);
} else {
cb();
}
}
if (hasError) {
cb();
} else if (hasLocalUnsyncedOps) {
requestInstantOpsSync(doClose);
} else {
doClose();
}
};
/**
* @param {!string} eventId
* @param {!Function} cb
* @return {undefined}
*/
this.subscribe = function (eventId, cb) {
eventNotifier.subscribe(eventId, cb);
};
/**
* @param {!string} eventId
* @param {!Function} cb
* @return {undefined}
*/
this.unsubscribe = function (eventId, cb) {
eventNotifier.unsubscribe(eventId, cb);
};
/**
* @return {!boolean}
*/
this.hasLocalUnsyncedOps = function () {
return hasLocalUnsyncedOps;
};
/**
* @return {!boolean}
*/
this.hasSessionHostConnection = function () {
return hasSessionHostConnection;
};
};
});