341 lines
11 KiB
JavaScript
341 lines
11 KiB
JavaScript
/*\
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title: $:/plugins/tiddlywiki/multiwikiclient/multiwikiclientadaptor.js
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type: application/javascript
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module-type: syncadaptor
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A sync adaptor module for synchronising with MultiWikiServer-compatible servers
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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var CONFIG_HOST_TIDDLER = "$:/config/multiwikiclient/host",
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DEFAULT_HOST_TIDDLER = "$protocol$//$host$/",
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BAG_STATE_TIDDLER = "$:/state/multiwikiclient/tiddlers/bag",
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REVISION_STATE_TIDDLER = "$:/state/multiwikiclient/tiddlers/revision",
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CONNECTION_STATE_TIDDLER = "$:/state/multiwikiclient/connection",
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INCOMING_UPDATES_FILTER_TIDDLER = "$:/config/multiwikiclient/incoming-updates-filter";
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var SERVER_NOT_CONNECTED = "NOT CONNECTED",
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SERVER_CONNECTING_SSE = "CONNECTING SSE",
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SERVER_CONNECTED_SSE = "CONNECTED SSE",
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SERVER_POLLING = "SERVER POLLING";
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function MultiWikiClientAdaptor(options) {
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this.wiki = options.wiki;
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this.host = this.getHost();
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this.recipe = this.wiki.getTiddlerText("$:/config/multiwikiclient/recipe");
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this.last_known_tiddler_id = $tw.utils.parseNumber(this.wiki.getTiddlerText("$:/state/multiwikiclient/recipe/last_tiddler_id","0"));
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this.logger = new $tw.utils.Logger("MultiWikiClientAdaptor");
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this.isLoggedIn = false;
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this.isReadOnly = false;
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this.logoutIsAvailable = true;
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// Compile the dirty tiddler filter
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this.incomingUpdatesFilterFn = this.wiki.compileFilter(this.wiki.getTiddlerText(INCOMING_UPDATES_FILTER_TIDDLER));
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this.setUpdateConnectionStatus(SERVER_NOT_CONNECTED);
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}
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MultiWikiClientAdaptor.prototype.setUpdateConnectionStatus = function(status) {
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this.serverUpdateConnectionStatus = status;
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this.wiki.addTiddler({
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title: CONNECTION_STATE_TIDDLER,
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text: status
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});
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};
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MultiWikiClientAdaptor.prototype.name = "multiwikiclient";
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MultiWikiClientAdaptor.prototype.supportsLazyLoading = true;
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MultiWikiClientAdaptor.prototype.setLoggerSaveBuffer = function(loggerForSaving) {
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this.logger.setSaveBuffer(loggerForSaving);
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};
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MultiWikiClientAdaptor.prototype.isReady = function() {
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return true;
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};
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MultiWikiClientAdaptor.prototype.getHost = function() {
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var text = this.wiki.getTiddlerText(CONFIG_HOST_TIDDLER,DEFAULT_HOST_TIDDLER),
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substitutions = [
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{name: "protocol", value: document.location.protocol},
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{name: "host", value: document.location.host},
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{name: "pathname", value: document.location.pathname}
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];
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for(var t=0; t<substitutions.length; t++) {
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var s = substitutions[t];
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text = $tw.utils.replaceString(text,new RegExp("\\$" + s.name + "\\$","mg"),s.value);
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}
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return text;
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};
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MultiWikiClientAdaptor.prototype.getTiddlerInfo = function(tiddler) {
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var title = tiddler.fields.title,
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revision = this.wiki.extractTiddlerDataItem(REVISION_STATE_TIDDLER,title),
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bag = this.wiki.extractTiddlerDataItem(BAG_STATE_TIDDLER,title);
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if(revision && bag) {
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return {
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title: title,
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revision: revision,
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bag: bag
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};
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} else {
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return undefined;
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}
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};
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MultiWikiClientAdaptor.prototype.getTiddlerBag = function(title) {
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return this.wiki.extractTiddlerDataItem(BAG_STATE_TIDDLER,title);
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};
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MultiWikiClientAdaptor.prototype.getTiddlerRevision = function(title) {
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return this.wiki.extractTiddlerDataItem(REVISION_STATE_TIDDLER,title);
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};
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MultiWikiClientAdaptor.prototype.setTiddlerInfo = function(title,revision,bag) {
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this.wiki.setText(BAG_STATE_TIDDLER,null,title,bag,{suppressTimestamp: true});
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this.wiki.setText(REVISION_STATE_TIDDLER,null,title,revision,{suppressTimestamp: true});
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};
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MultiWikiClientAdaptor.prototype.removeTiddlerInfo = function(title) {
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this.wiki.setText(BAG_STATE_TIDDLER,null,title,undefined,{suppressTimestamp: true});
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this.wiki.setText(REVISION_STATE_TIDDLER,null,title,undefined,{suppressTimestamp: true});
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};
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/*
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Get the current status of the server connection
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*/
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MultiWikiClientAdaptor.prototype.getStatus = function(callback) {
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// Invoke the callback if present
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if(callback) {
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callback(
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null, // Error
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true, // Is logged in
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this.username, // Username
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false, // Is read only
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true // Is anonymous
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);
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}
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};
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/*
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Get details of changed tiddlers from the server
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*/
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MultiWikiClientAdaptor.prototype.getUpdatedTiddlers = function(syncer,callback) {
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var self = this;
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// Do nothing if there's already a connection in progress.
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if(this.serverUpdateConnectionStatus !== SERVER_NOT_CONNECTED) {
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return callback(null,{
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modifications: [],
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deletions: []
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});
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}
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// Try to connect a server stream
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this.setUpdateConnectionStatus(SERVER_CONNECTING_SSE);
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this.connectServerStream({
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syncer: syncer,
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onerror: function(err) {
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self.logger.log("Error connecting SSE stream",err);
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// If the stream didn't work, try polling
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self.setUpdateConnectionStatus(SERVER_POLLING);
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self.pollServer({
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callback: function(err,changes) {
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self.setUpdateConnectionStatus(SERVER_NOT_CONNECTED);
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callback(null,changes);
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}
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});
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},
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onopen: function() {
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self.setUpdateConnectionStatus(SERVER_CONNECTED_SSE);
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// The syncer is expecting a callback but we don't have any data to send
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callback(null,{
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modifications: [],
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deletions: []
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});
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}
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});
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};
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/*
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Attempt to establish an SSE stream with the server and transfer tiddler changes. Options include:
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syncer: reference to syncer object used for storing data
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onopen: invoked when the stream is successfully opened
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onerror: invoked if there is an error
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*/
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MultiWikiClientAdaptor.prototype.connectServerStream = function(options) {
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var self = this;
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const eventSource = new EventSource("/recipes/" + this.recipe + "/events?last_known_tiddler_id=" + this.last_known_tiddler_id);
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eventSource.onerror = function(event) {
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if(options.onerror) {
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options.onerror(event);
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}
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}
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eventSource.onopen = function(event) {
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if(options.onopen) {
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options.onopen(event);
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}
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}
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eventSource.addEventListener("change", function(event) {
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const data = $tw.utils.parseJSONSafe(event.data);
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if(data) {
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console.log("SSE data",data)
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if(data.tiddler_id > self.last_known_tiddler_id) {
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self.last_known_tiddler_id = data.tiddler_id;
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}
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if(data.is_deleted) {
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self.removeTiddlerInfo(data.title);
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delete options.syncer.tiddlerInfo[data.title];
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options.syncer.logger.log("Deleting tiddler missing from server:",data.title);
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options.syncer.wiki.deleteTiddler(data.title);
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options.syncer.processTaskQueue();
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} else {
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var result = self.incomingUpdatesFilterFn.call(self.wiki,self.wiki.makeTiddlerIterator([data.title]));
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if(result.length > 0) {
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self.setTiddlerInfo(data.title,data.tiddler_id,data.bag_name);
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options.syncer.storeTiddler(data.tiddler);
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}
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}
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}
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});
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};
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/*
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Poll the server for changes. Options include:
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callback: invoked on completion as (err,changes)
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*/
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MultiWikiClientAdaptor.prototype.pollServer = function(options) {
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var self = this;
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$tw.utils.httpRequest({
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url: this.host + "recipes/" + this.recipe + "/tiddlers.json",
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data: {
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last_known_tiddler_id: this.last_known_tiddler_id,
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include_deleted: "true"
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},
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callback: function(err,data) {
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// Check for errors
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if(err) {
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return options.callback(err);
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}
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var modifications = [],
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deletions = [];
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var tiddlerInfoArray = $tw.utils.parseJSONSafe(data);
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$tw.utils.each(tiddlerInfoArray,function(tiddlerInfo) {
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if(tiddlerInfo.tiddler_id > self.last_known_tiddler_id) {
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self.last_known_tiddler_id = tiddlerInfo.tiddler_id;
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}
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if(tiddlerInfo.is_deleted) {
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deletions.push(tiddlerInfo.title);
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} else {
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modifications.push(tiddlerInfo.title);
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}
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});
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// Invoke the callback with the results
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options.callback(null,{
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modifications: modifications,
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deletions: deletions
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});
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// If Browswer Storage tiddlers were cached on reloading the wiki, add them after sync from server completes in the above callback.
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if($tw.browserStorage && $tw.browserStorage.isEnabled()) {
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$tw.browserStorage.addCachedTiddlers();
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}
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}
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});
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};
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/*
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Save a tiddler and invoke the callback with (err,adaptorInfo,revision)
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*/
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MultiWikiClientAdaptor.prototype.saveTiddler = function(tiddler,callback,options) {
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var self = this;
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if(this.isReadOnly) {
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return callback(null);
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}
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$tw.utils.httpRequest({
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url: this.host + "recipes/" + encodeURIComponent(this.recipe) + "/tiddlers/" + encodeURIComponent(tiddler.fields.title),
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type: "PUT",
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headers: {
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"Content-type": "application/json"
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},
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data: JSON.stringify(tiddler.getFieldStrings()),
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callback: function(err,data,request) {
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if(err) {
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return callback(err);
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}
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//If Browser-Storage plugin is present, remove tiddler from local storage after successful sync to the server
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if($tw.browserStorage && $tw.browserStorage.isEnabled()) {
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$tw.browserStorage.removeTiddlerFromLocalStorage(tiddler.fields.title)
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}
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// Save the details of the new revision of the tiddler
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var revision = request.getResponseHeader("X-Revision-Number"),
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bag_name = request.getResponseHeader("X-Bag-Name");
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console.log(`Saved ${tiddler.fields.title} with revision ${revision} and bag ${bag_name}`)
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// Invoke the callback
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self.setTiddlerInfo(tiddler.fields.title,revision,bag_name);
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callback(null,{bag: bag_name},revision);
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}
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});
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};
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/*
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Load a tiddler and invoke the callback with (err,tiddlerFields)
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*/
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MultiWikiClientAdaptor.prototype.loadTiddler = function(title,callback) {
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var self = this;
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$tw.utils.httpRequest({
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url: this.host + "recipes/" + encodeURIComponent(this.recipe) + "/tiddlers/" + encodeURIComponent(title),
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callback: function(err,data,request) {
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if(err === 404) {
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return callback(null,null);
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} else if(err) {
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return callback(err);
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}
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// Invoke the callback
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var revision = request.getResponseHeader("X-Revision-Number"),
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bag_name = request.getResponseHeader("X-Bag-Name");
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self.setTiddlerInfo(title,revision,bag_name);
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callback(null,$tw.utils.parseJSONSafe(data));
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}
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});
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};
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/*
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Delete a tiddler and invoke the callback with (err)
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options include:
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tiddlerInfo: the syncer's tiddlerInfo for this tiddler
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*/
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MultiWikiClientAdaptor.prototype.deleteTiddler = function(title,callback,options) {
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var self = this;
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if(this.isReadOnly) {
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return callback(null);
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}
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// If we don't have a bag it means that the tiddler hasn't been seen by the server, so we don't need to delete it
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var bag = this.getTiddlerBag(title);
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if(!bag) {
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return callback(null,options.tiddlerInfo.adaptorInfo);
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}
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// Issue HTTP request to delete the tiddler
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$tw.utils.httpRequest({
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url: this.host + "bags/" + encodeURIComponent(bag) + "/tiddlers/" + encodeURIComponent(title),
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type: "DELETE",
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callback: function(err,data,request) {
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if(err) {
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return callback(err);
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}
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self.removeTiddlerInfo(title);
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// Invoke the callback & return null adaptorInfo
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callback(null,null);
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}
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});
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};
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if($tw.browser && document.location.protocol.substr(0,4) === "http" ) {
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exports.adaptorClass = MultiWikiClientAdaptor;
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}
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})();
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