132 lines
4.4 KiB
JavaScript
132 lines
4.4 KiB
JavaScript
/*
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Copyright 2014 matrix.org
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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'use strict';
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/*
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This service manages where in the event stream the web client currently is,
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repolling the event stream, and provides methods to resume/pause/stop the event
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stream. This service is not responsible for parsing event data. For that, see
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the eventHandlerService.
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*/
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angular.module('eventStreamService', [])
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.factory('eventStreamService', ['$q', '$timeout', 'matrixService', 'eventHandlerService', function($q, $timeout, matrixService, eventHandlerService) {
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var END = "END";
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var START = "START";
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var TIMEOUT_MS = 5000;
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var ERR_TIMEOUT_MS = 5000;
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var settings = {
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from: "END",
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to: undefined,
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limit: undefined,
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shouldPoll: true,
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isActive: false
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};
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// interrupts the stream. Only valid if there is a stream conneciton
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// open.
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var interrupt = function(shouldPoll) {
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console.log("[EventStream] interrupt("+shouldPoll+") "+
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JSON.stringify(settings));
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settings.shouldPoll = shouldPoll;
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settings.isActive = false;
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};
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var saveStreamSettings = function() {
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localStorage.setItem("streamSettings", JSON.stringify(settings));
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};
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var startEventStream = function() {
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settings.shouldPoll = true;
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settings.isActive = true;
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var deferred = $q.defer();
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// run the stream from the latest token
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matrixService.getEventStream(settings.from, TIMEOUT_MS).then(
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function(response) {
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if (!settings.isActive) {
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console.log("[EventStream] Got response but now inactive. Dropping data.");
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return;
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}
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settings.from = response.data.end;
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console.log("[EventStream] Got response from "+settings.from+" to "+response.data.end);
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eventHandlerService.handleEvents(response.data.chunk, true);
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deferred.resolve(response);
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if (settings.shouldPoll) {
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$timeout(startEventStream, 0);
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}
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else {
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console.log("[EventStream] Stopping poll.");
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}
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},
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function(error) {
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if (error.status == 403) {
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settings.shouldPoll = false;
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}
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deferred.reject(error);
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if (settings.shouldPoll) {
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$timeout(startEventStream, ERR_TIMEOUT_MS);
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}
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else {
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console.log("[EventStream] Stopping polling.");
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}
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}
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);
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return deferred.promise;
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};
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return {
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// resume the stream from whereever it last got up to. Typically used
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// when the page is opened.
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resume: function() {
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if (settings.isActive) {
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console.log("[EventStream] Already active, ignoring resume()");
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return;
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}
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console.log("[EventStream] resume "+JSON.stringify(settings));
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return startEventStream();
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},
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// pause the stream. Resuming it will continue from the current position
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pause: function() {
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console.log("[EventStream] pause "+JSON.stringify(settings));
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// kill any running stream
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interrupt(false);
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// save the latest token
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saveStreamSettings();
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},
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// stop the stream and wipe the position in the stream. Typically used
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// when logging out / logged out.
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stop: function() {
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console.log("[EventStream] stop "+JSON.stringify(settings));
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// kill any running stream
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interrupt(false);
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// clear the latest token
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settings.from = END;
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saveStreamSettings();
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}
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};
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}]);
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