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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * How does the clients engine work?
+ *
+ * - We use 2 files - commands.json and commands-syncing.json.
+ *
+ * - At sync upload time, we attempt a rename of commands.json to
+ * commands-syncing.json, and ignore errors (helps for crash during sync!).
+ * - We load commands-syncing.json and stash the contents in
+ * _currentlySyncingCommands which lives for the duration of the upload process.
+ * - We use _currentlySyncingCommands to build the outgoing records
+ * - Immediately after successful upload, we delete commands-syncing.json from
+ * disk (and clear _currentlySyncingCommands). We reconcile our local records
+ * with what we just wrote in the server, and add failed IDs commands
+ * back in commands.json
+ * - Any time we need to "save" a command for future syncs, we load
+ * commands.json, update it, and write it back out.
+ */
+
+this.EXPORTED_SYMBOLS = [
+ "ClientEngine",
+ "ClientsRec"
+];
+
+var {classes: Cc, interfaces: Ci, utils: Cu} = Components;
+
+Cu.import("resource://services-common/async.js");
+Cu.import("resource://services-common/stringbundle.js");
+Cu.import("resource://services-sync/constants.js");
+Cu.import("resource://services-sync/engines.js");
+Cu.import("resource://services-sync/record.js");
+Cu.import("resource://services-sync/resource.js");
+Cu.import("resource://services-sync/util.js");
+Cu.import("resource://gre/modules/Services.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "fxAccounts",
+ "resource://gre/modules/FxAccounts.jsm");
+
+const CLIENTS_TTL = 1814400; // 21 days
+const CLIENTS_TTL_REFRESH = 604800; // 7 days
+const STALE_CLIENT_REMOTE_AGE = 604800; // 7 days
+
+const SUPPORTED_PROTOCOL_VERSIONS = ["1.1", "1.5"];
+
+function hasDupeCommand(commands, action) {
+ if (!commands) {
+ return false;
+ }
+ return commands.some(other => other.command == action.command &&
+ Utils.deepEquals(other.args, action.args));
+}
+
+this.ClientsRec = function ClientsRec(collection, id) {
+ CryptoWrapper.call(this, collection, id);
+}
+ClientsRec.prototype = {
+ __proto__: CryptoWrapper.prototype,
+ _logName: "Sync.Record.Clients",
+ ttl: CLIENTS_TTL
+};
+
+Utils.deferGetSet(ClientsRec,
+ "cleartext",
+ ["name", "type", "commands",
+ "version", "protocols",
+ "formfactor", "os", "appPackage", "application", "device",
+ "fxaDeviceId"]);
+
+
+this.ClientEngine = function ClientEngine(service) {
+ SyncEngine.call(this, "Clients", service);
+
+ // Reset the last sync timestamp on every startup so that we fetch all clients
+ this.resetLastSync();
+}
+ClientEngine.prototype = {
+ __proto__: SyncEngine.prototype,
+ _storeObj: ClientStore,
+ _recordObj: ClientsRec,
+ _trackerObj: ClientsTracker,
+ allowSkippedRecord: false,
+
+ // Always sync client data as it controls other sync behavior
+ get enabled() {
+ return true;
+ },
+
+ get lastRecordUpload() {
+ return Svc.Prefs.get(this.name + ".lastRecordUpload", 0);
+ },
+ set lastRecordUpload(value) {
+ Svc.Prefs.set(this.name + ".lastRecordUpload", Math.floor(value));
+ },
+
+ get remoteClients() {
+ // return all non-stale clients for external consumption.
+ return Object.values(this._store._remoteClients).filter(v => !v.stale);
+ },
+
+ remoteClientExists(id) {
+ let client = this._store._remoteClients[id];
+ return !!(client && !client.stale);
+ },
+
+ // Aggregate some stats on the composition of clients on this account
+ get stats() {
+ let stats = {
+ hasMobile: this.localType == DEVICE_TYPE_MOBILE,
+ names: [this.localName],
+ numClients: 1,
+ };
+
+ for (let id in this._store._remoteClients) {
+ let {name, type, stale} = this._store._remoteClients[id];
+ if (!stale) {
+ stats.hasMobile = stats.hasMobile || type == DEVICE_TYPE_MOBILE;
+ stats.names.push(name);
+ stats.numClients++;
+ }
+ }
+
+ return stats;
+ },
+
+ /**
+ * Obtain information about device types.
+ *
+ * Returns a Map of device types to integer counts.
+ */
+ get deviceTypes() {
+ let counts = new Map();
+
+ counts.set(this.localType, 1);
+
+ for (let id in this._store._remoteClients) {
+ let record = this._store._remoteClients[id];
+ if (record.stale) {
+ continue; // pretend "stale" records don't exist.
+ }
+ let type = record.type;
+ if (!counts.has(type)) {
+ counts.set(type, 0);
+ }
+
+ counts.set(type, counts.get(type) + 1);
+ }
+
+ return counts;
+ },
+
+ get localID() {
+ // Generate a random GUID id we don't have one
+ let localID = Svc.Prefs.get("client.GUID", "");
+ return localID == "" ? this.localID = Utils.makeGUID() : localID;
+ },
+ set localID(value) {
+ Svc.Prefs.set("client.GUID", value);
+ },
+
+ get brandName() {
+ let brand = new StringBundle("chrome://branding/locale/brand.properties");
+ return brand.get("brandShortName");
+ },
+
+ get localName() {
+ let name = Utils.getDeviceName();
+ // If `getDeviceName` returns the default name, set the pref. FxA registers
+ // the device before syncing, so we don't need to update the registration
+ // in this case.
+ Svc.Prefs.set("client.name", name);
+ return name;
+ },
+ set localName(value) {
+ Svc.Prefs.set("client.name", value);
+ // Update the registration in the background.
+ fxAccounts.updateDeviceRegistration().catch(error => {
+ this._log.warn("failed to update fxa device registration", error);
+ });
+ },
+
+ get localType() {
+ return Utils.getDeviceType();
+ },
+ set localType(value) {
+ Svc.Prefs.set("client.type", value);
+ },
+
+ getClientName(id) {
+ if (id == this.localID) {
+ return this.localName;
+ }
+ let client = this._store._remoteClients[id];
+ return client ? client.name : "";
+ },
+
+ getClientFxaDeviceId(id) {
+ if (this._store._remoteClients[id]) {
+ return this._store._remoteClients[id].fxaDeviceId;
+ }
+ return null;
+ },
+
+ isMobile: function isMobile(id) {
+ if (this._store._remoteClients[id])
+ return this._store._remoteClients[id].type == DEVICE_TYPE_MOBILE;
+ return false;
+ },
+
+ _readCommands() {
+ let cb = Async.makeSpinningCallback();
+ Utils.jsonLoad("commands", this, commands => cb(null, commands));
+ return cb.wait() || {};
+ },
+
+ /**
+ * Low level function, do not use directly (use _addClientCommand instead).
+ */
+ _saveCommands(commands) {
+ let cb = Async.makeSpinningCallback();
+ Utils.jsonSave("commands", this, commands, error => {
+ if (error) {
+ this._log.error("Failed to save JSON outgoing commands", error);
+ }
+ cb();
+ });
+ cb.wait();
+ },
+
+ _prepareCommandsForUpload() {
+ let cb = Async.makeSpinningCallback();
+ Utils.jsonMove("commands", "commands-syncing", this).catch(() => {}) // Ignore errors
+ .then(() => {
+ Utils.jsonLoad("commands-syncing", this, commands => cb(null, commands));
+ });
+ return cb.wait() || {};
+ },
+
+ _deleteUploadedCommands() {
+ delete this._currentlySyncingCommands;
+ Async.promiseSpinningly(
+ Utils.jsonRemove("commands-syncing", this).catch(err => {
+ this._log.error("Failed to delete syncing-commands file", err);
+ })
+ );
+ },
+
+ _addClientCommand(clientId, command) {
+ const allCommands = this._readCommands();
+ const clientCommands = allCommands[clientId] || [];
+ if (hasDupeCommand(clientCommands, command)) {
+ return;
+ }
+ allCommands[clientId] = clientCommands.concat(command);
+ this._saveCommands(allCommands);
+ },
+
+ _syncStartup: function _syncStartup() {
+ // Reupload new client record periodically.
+ if (Date.now() / 1000 - this.lastRecordUpload > CLIENTS_TTL_REFRESH) {
+ this._tracker.addChangedID(this.localID);
+ this.lastRecordUpload = Date.now() / 1000;
+ }
+ SyncEngine.prototype._syncStartup.call(this);
+ },
+
+ _processIncoming() {
+ // Fetch all records from the server.
+ this.lastSync = 0;
+ this._incomingClients = {};
+ try {
+ SyncEngine.prototype._processIncoming.call(this);
+ // Since clients are synced unconditionally, any records in the local store
+ // that don't exist on the server must be for disconnected clients. Remove
+ // them, so that we don't upload records with commands for clients that will
+ // never see them. We also do this to filter out stale clients from the
+ // tabs collection, since showing their list of tabs is confusing.
+ for (let id in this._store._remoteClients) {
+ if (!this._incomingClients[id]) {
+ this._log.info(`Removing local state for deleted client ${id}`);
+ this._removeRemoteClient(id);
+ }
+ }
+ // Bug 1264498: Mobile clients don't remove themselves from the clients
+ // collection when the user disconnects Sync, so we mark as stale clients
+ // with the same name that haven't synced in over a week.
+ // (Note we can't simply delete them, or we re-apply them next sync - see
+ // bug 1287687)
+ delete this._incomingClients[this.localID];
+ let names = new Set([this.localName]);
+ for (let id in this._incomingClients) {
+ let record = this._store._remoteClients[id];
+ if (!names.has(record.name)) {
+ names.add(record.name);
+ continue;
+ }
+ let remoteAge = AsyncResource.serverTime - this._incomingClients[id];
+ if (remoteAge > STALE_CLIENT_REMOTE_AGE) {
+ this._log.info(`Hiding stale client ${id} with age ${remoteAge}`);
+ record.stale = true;
+ }
+ }
+ } finally {
+ this._incomingClients = null;
+ }
+ },
+
+ _uploadOutgoing() {
+ this._currentlySyncingCommands = this._prepareCommandsForUpload();
+ const clientWithPendingCommands = Object.keys(this._currentlySyncingCommands);
+ for (let clientId of clientWithPendingCommands) {
+ if (this._store._remoteClients[clientId] || this.localID == clientId) {
+ this._modified.set(clientId, 0);
+ }
+ }
+ SyncEngine.prototype._uploadOutgoing.call(this);
+ },
+
+ _onRecordsWritten(succeeded, failed) {
+ // Reconcile the status of the local records with what we just wrote on the
+ // server
+ for (let id of succeeded) {
+ const commandChanges = this._currentlySyncingCommands[id];
+ if (id == this.localID) {
+ if (this.localCommands) {
+ this.localCommands = this.localCommands.filter(command => !hasDupeCommand(commandChanges, command));
+ }
+ } else {
+ const clientRecord = this._store._remoteClients[id];
+ if (!commandChanges || !clientRecord) {
+ // should be impossible, else we wouldn't have been writing it.
+ this._log.warn("No command/No record changes for a client we uploaded");
+ continue;
+ }
+ // fixup the client record, so our copy of _remoteClients matches what we uploaded.
+ clientRecord.commands = this._store.createRecord(id);
+ // we could do better and pass the reference to the record we just uploaded,
+ // but this will do for now
+ }
+ }
+
+ // Re-add failed commands
+ for (let id of failed) {
+ const commandChanges = this._currentlySyncingCommands[id];
+ if (!commandChanges) {
+ continue;
+ }
+ this._addClientCommand(id, commandChanges);
+ }
+
+ this._deleteUploadedCommands();
+
+ // Notify other devices that their own client collection changed
+ const idsToNotify = succeeded.reduce((acc, id) => {
+ if (id == this.localID) {
+ return acc;
+ }
+ const fxaDeviceId = this.getClientFxaDeviceId(id);
+ return fxaDeviceId ? acc.concat(fxaDeviceId) : acc;
+ }, []);
+ if (idsToNotify.length > 0) {
+ this._notifyCollectionChanged(idsToNotify);
+ }
+ },
+
+ _notifyCollectionChanged(ids) {
+ const message = {
+ version: 1,
+ command: "sync:collection_changed",
+ data: {
+ collections: ["clients"]
+ }
+ };
+ fxAccounts.notifyDevices(ids, message, NOTIFY_TAB_SENT_TTL_SECS);
+ },
+
+ _syncFinish() {
+ // Record histograms for our device types, and also write them to a pref
+ // so non-histogram telemetry (eg, UITelemetry) has easy access to them.
+ for (let [deviceType, count] of this.deviceTypes) {
+ let hid;
+ let prefName = this.name + ".devices.";
+ switch (deviceType) {
+ case "desktop":
+ hid = "WEAVE_DEVICE_COUNT_DESKTOP";
+ prefName += "desktop";
+ break;
+ case "mobile":
+ hid = "WEAVE_DEVICE_COUNT_MOBILE";
+ prefName += "mobile";
+ break;
+ default:
+ this._log.warn(`Unexpected deviceType "${deviceType}" recording device telemetry.`);
+ continue;
+ }
+ Services.telemetry.getHistogramById(hid).add(count);
+ Svc.Prefs.set(prefName, count);
+ }
+ SyncEngine.prototype._syncFinish.call(this);
+ },
+
+ _reconcile: function _reconcile(item) {
+ // Every incoming record is reconciled, so we use this to track the
+ // contents of the collection on the server.
+ this._incomingClients[item.id] = item.modified;
+
+ if (!this._store.itemExists(item.id)) {
+ return true;
+ }
+ // Clients are synced unconditionally, so we'll always have new records.
+ // Unfortunately, this will cause the scheduler to use the immediate sync
+ // interval for the multi-device case, instead of the active interval. We
+ // work around this by updating the record during reconciliation, and
+ // returning false to indicate that the record doesn't need to be applied
+ // later.
+ this._store.update(item);
+ return false;
+ },
+
+ // Treat reset the same as wiping for locally cached clients
+ _resetClient() {
+ this._wipeClient();
+ },
+
+ _wipeClient: function _wipeClient() {
+ SyncEngine.prototype._resetClient.call(this);
+ delete this.localCommands;
+ this._store.wipe();
+ const logRemoveError = err => this._log.warn("Could not delete json file", err);
+ Async.promiseSpinningly(
+ Utils.jsonRemove("commands", this).catch(logRemoveError)
+ .then(Utils.jsonRemove("commands-syncing", this).catch(logRemoveError))
+ );
+ },
+
+ removeClientData: function removeClientData() {
+ let res = this.service.resource(this.engineURL + "/" + this.localID);
+ res.delete();
+ },
+
+ // Override the default behavior to delete bad records from the server.
+ handleHMACMismatch: function handleHMACMismatch(item, mayRetry) {
+ this._log.debug("Handling HMAC mismatch for " + item.id);
+
+ let base = SyncEngine.prototype.handleHMACMismatch.call(this, item, mayRetry);
+ if (base != SyncEngine.kRecoveryStrategy.error)
+ return base;
+
+ // It's a bad client record. Save it to be deleted at the end of the sync.
+ this._log.debug("Bad client record detected. Scheduling for deletion.");
+ this._deleteId(item.id);
+
+ // Neither try again nor error; we're going to delete it.
+ return SyncEngine.kRecoveryStrategy.ignore;
+ },
+
+ /**
+ * A hash of valid commands that the client knows about. The key is a command
+ * and the value is a hash containing information about the command such as
+ * number of arguments and description.
+ */
+ _commands: {
+ resetAll: { args: 0, desc: "Clear temporary local data for all engines" },
+ resetEngine: { args: 1, desc: "Clear temporary local data for engine" },
+ wipeAll: { args: 0, desc: "Delete all client data for all engines" },
+ wipeEngine: { args: 1, desc: "Delete all client data for engine" },
+ logout: { args: 0, desc: "Log out client" },
+ displayURI: { args: 3, desc: "Instruct a client to display a URI" },
+ },
+
+ /**
+ * Sends a command+args pair to a specific client.
+ *
+ * @param command Command string
+ * @param args Array of arguments/data for command
+ * @param clientId Client to send command to
+ */
+ _sendCommandToClient: function sendCommandToClient(command, args, clientId) {
+ this._log.trace("Sending " + command + " to " + clientId);
+
+ let client = this._store._remoteClients[clientId];
+ if (!client) {
+ throw new Error("Unknown remote client ID: '" + clientId + "'.");
+ }
+ if (client.stale) {
+ throw new Error("Stale remote client ID: '" + clientId + "'.");
+ }
+
+ let action = {
+ command: command,
+ args: args,
+ };
+
+ this._log.trace("Client " + clientId + " got a new action: " + [command, args]);
+ this._addClientCommand(clientId, action);
+ this._tracker.addChangedID(clientId);
+ },
+
+ /**
+ * Check if the local client has any remote commands and perform them.
+ *
+ * @return false to abort sync
+ */
+ processIncomingCommands: function processIncomingCommands() {
+ return this._notify("clients:process-commands", "", function() {
+ if (!this.localCommands) {
+ return true;
+ }
+
+ const clearedCommands = this._readCommands()[this.localID];
+ const commands = this.localCommands.filter(command => !hasDupeCommand(clearedCommands, command));
+
+ let URIsToDisplay = [];
+ // Process each command in order.
+ for (let rawCommand of commands) {
+ let {command, args} = rawCommand;
+ this._log.debug("Processing command: " + command + "(" + args + ")");
+
+ let engines = [args[0]];
+ switch (command) {
+ case "resetAll":
+ engines = null;
+ // Fallthrough
+ case "resetEngine":
+ this.service.resetClient(engines);
+ break;
+ case "wipeAll":
+ engines = null;
+ // Fallthrough
+ case "wipeEngine":
+ this.service.wipeClient(engines);
+ break;
+ case "logout":
+ this.service.logout();
+ return false;
+ case "displayURI":
+ let [uri, clientId, title] = args;
+ URIsToDisplay.push({ uri, clientId, title });
+ break;
+ default:
+ this._log.debug("Received an unknown command: " + command);
+ break;
+ }
+ // Add the command to the "cleared" commands list
+ this._addClientCommand(this.localID, rawCommand)
+ }
+ this._tracker.addChangedID(this.localID);
+
+ if (URIsToDisplay.length) {
+ this._handleDisplayURIs(URIsToDisplay);
+ }
+
+ return true;
+ })();
+ },
+
+ /**
+ * Validates and sends a command to a client or all clients.
+ *
+ * Calling this does not actually sync the command data to the server. If the
+ * client already has the command/args pair, it won't receive a duplicate
+ * command.
+ *
+ * @param command
+ * Command to invoke on remote clients
+ * @param args
+ * Array of arguments to give to the command
+ * @param clientId
+ * Client ID to send command to. If undefined, send to all remote
+ * clients.
+ */
+ sendCommand: function sendCommand(command, args, clientId) {
+ let commandData = this._commands[command];
+ // Don't send commands that we don't know about.
+ if (!commandData) {
+ this._log.error("Unknown command to send: " + command);
+ return;
+ }
+ // Don't send a command with the wrong number of arguments.
+ else if (!args || args.length != commandData.args) {
+ this._log.error("Expected " + commandData.args + " args for '" +
+ command + "', but got " + args);
+ return;
+ }
+
+ if (clientId) {
+ this._sendCommandToClient(command, args, clientId);
+ } else {
+ for (let [id, record] of Object.entries(this._store._remoteClients)) {
+ if (!record.stale) {
+ this._sendCommandToClient(command, args, id);
+ }
+ }
+ }
+ },
+
+ /**
+ * Send a URI to another client for display.
+ *
+ * A side effect is the score is increased dramatically to incur an
+ * immediate sync.
+ *
+ * If an unknown client ID is specified, sendCommand() will throw an
+ * Error object.
+ *
+ * @param uri
+ * URI (as a string) to send and display on the remote client
+ * @param clientId
+ * ID of client to send the command to. If not defined, will be sent
+ * to all remote clients.
+ * @param title
+ * Title of the page being sent.
+ */
+ sendURIToClientForDisplay: function sendURIToClientForDisplay(uri, clientId, title) {
+ this._log.info("Sending URI to client: " + uri + " -> " +
+ clientId + " (" + title + ")");
+ this.sendCommand("displayURI", [uri, this.localID, title], clientId);
+
+ this._tracker.score += SCORE_INCREMENT_XLARGE;
+ },
+
+ /**
+ * Handle a bunch of received 'displayURI' commands.
+ *
+ * Interested parties should observe the "weave:engine:clients:display-uris"
+ * topic. The callback will receive an array as the subject parameter
+ * containing objects with the following keys:
+ *
+ * uri URI (string) that is requested for display.
+ * clientId ID of client that sent the command.
+ * title Title of page that loaded URI (likely) corresponds to.
+ *
+ * The 'data' parameter to the callback will not be defined.
+ *
+ * @param uris
+ * An array containing URI objects to display
+ * @param uris[].uri
+ * String URI that was received
+ * @param uris[].clientId
+ * ID of client that sent URI
+ * @param uris[].title
+ * String title of page that URI corresponds to. Older clients may not
+ * send this.
+ */
+ _handleDisplayURIs: function _handleDisplayURIs(uris) {
+ Svc.Obs.notify("weave:engine:clients:display-uris", uris);
+ },
+
+ _removeRemoteClient(id) {
+ delete this._store._remoteClients[id];
+ this._tracker.removeChangedID(id);
+ },
+};
+
+function ClientStore(name, engine) {
+ Store.call(this, name, engine);
+}
+ClientStore.prototype = {
+ __proto__: Store.prototype,
+
+ _remoteClients: {},
+
+ create(record) {
+ this.update(record);
+ },
+
+ update: function update(record) {
+ if (record.id == this.engine.localID) {
+ // Only grab commands from the server; local name/type always wins
+ this.engine.localCommands = record.commands;
+ } else {
+ this._remoteClients[record.id] = record.cleartext;
+ }
+ },
+
+ createRecord: function createRecord(id, collection) {
+ let record = new ClientsRec(collection, id);
+
+ const commandsChanges = this.engine._currentlySyncingCommands ?
+ this.engine._currentlySyncingCommands[id] :
+ [];
+
+ // Package the individual components into a record for the local client
+ if (id == this.engine.localID) {
+ let cb = Async.makeSpinningCallback();
+ fxAccounts.getDeviceId().then(id => cb(null, id), cb);
+ try {
+ record.fxaDeviceId = cb.wait();
+ } catch(error) {
+ this._log.warn("failed to get fxa device id", error);
+ }
+ record.name = this.engine.localName;
+ record.type = this.engine.localType;
+ record.version = Services.appinfo.version;
+ record.protocols = SUPPORTED_PROTOCOL_VERSIONS;
+
+ // Substract the commands we recorded that we've already executed
+ if (commandsChanges && commandsChanges.length &&
+ this.engine.localCommands && this.engine.localCommands.length) {
+ record.commands = this.engine.localCommands.filter(command => !hasDupeCommand(commandsChanges, command));
+ }
+
+ // Optional fields.
+ record.os = Services.appinfo.OS; // "Darwin"
+ record.appPackage = Services.appinfo.ID;
+ record.application = this.engine.brandName // "Nightly"
+
+ // We can't compute these yet.
+ // record.device = ""; // Bug 1100723
+ // record.formfactor = ""; // Bug 1100722
+ } else {
+ record.cleartext = this._remoteClients[id];
+
+ // Add the commands we have to send
+ if (commandsChanges && commandsChanges.length) {
+ const recordCommands = record.cleartext.commands || [];
+ const newCommands = commandsChanges.filter(command => !hasDupeCommand(recordCommands, command));
+ record.cleartext.commands = recordCommands.concat(newCommands);
+ }
+
+ if (record.cleartext.stale) {
+ // It's almost certainly a logic error for us to upload a record we
+ // consider stale, so make log noise, but still remove the flag.
+ this._log.error(`Preparing to upload record ${id} that we consider stale`);
+ delete record.cleartext.stale;
+ }
+ }
+
+ return record;
+ },
+
+ itemExists(id) {
+ return id in this.getAllIDs();
+ },
+
+ getAllIDs: function getAllIDs() {
+ let ids = {};
+ ids[this.engine.localID] = true;
+ for (let id in this._remoteClients)
+ ids[id] = true;
+ return ids;
+ },
+
+ wipe: function wipe() {
+ this._remoteClients = {};
+ },
+};
+
+function ClientsTracker(name, engine) {
+ Tracker.call(this, name, engine);
+ Svc.Obs.add("weave:engine:start-tracking", this);
+ Svc.Obs.add("weave:engine:stop-tracking", this);
+}
+ClientsTracker.prototype = {
+ __proto__: Tracker.prototype,
+
+ _enabled: false,
+
+ observe: function observe(subject, topic, data) {
+ switch (topic) {
+ case "weave:engine:start-tracking":
+ if (!this._enabled) {
+ Svc.Prefs.observe("client.name", this);
+ this._enabled = true;
+ }
+ break;
+ case "weave:engine:stop-tracking":
+ if (this._enabled) {
+ Svc.Prefs.ignore("client.name", this);
+ this._enabled = false;
+ }
+ break;
+ case "nsPref:changed":
+ this._log.debug("client.name preference changed");
+ this.addChangedID(Svc.Prefs.get("client.GUID"));
+ this.score += SCORE_INCREMENT_XLARGE;
+ break;
+ }
+ }
+};
generated by cgit v1.2.3 (git 2.26.2) at 2024-11-11 08:19:11 +0000