misc: add objectManager class
The D-Bus ObjectManager interface is fairly recent addition to the D-Bus specification. Its purpose is to provide a standardized way to track objects dynamically coming and going for a service, and to track capabilities dynamically coming and going for those objects (by means of interfaces). This commit adds the requisite code needed to make use of the ObjectManager interface. It will ultimately be needed to implement smartcard support in the login screen. https://bugzilla.gnome.org/show_bug.cgi?id=683437
This commit is contained in:
Ray Strode
parent
4394a05243
commit
4b450bab11
@ -33,6 +33,7 @@ nobase_dist_js_DATA = \
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misc/jsParse.js \
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misc/loginManager.js \
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misc/modemManager.js \
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misc/objectManager.js \
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misc/params.js \
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misc/util.js \
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perf/core.js \
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254
js/misc/objectManager.js
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254
js/misc/objectManager.js
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@ -0,0 +1,254 @@
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// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
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const Gio = imports.gi.Gio;
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const GLib = imports.gi.GLib;
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const Lang = imports.lang;
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const Params = imports.misc.params;
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const Signals = imports.signals;
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// Specified in the D-Bus specification here:
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// http://dbus.freedesktop.org/doc/dbus-specification.html#standard-interfaces-objectmanager
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const ObjectManagerIface = <interface name="org.freedesktop.DBus.ObjectManager">
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<method name="GetManagedObjects">
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<arg name="objects" type="a{oa{sa{sv}}}" direction="out"/>
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</method>
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<signal name="InterfacesAdded">
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<arg name="objectPath" type="o"/>
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<arg name="interfaces" type="a{sa{sv}}" />
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</signal>
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<signal name="InterfacesRemoved">
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<arg name="objectPath" type="o"/>
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<arg name="interfaces" type="as" />
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</signal>
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</interface>
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const ObjectManagerInfo = Gio.DBusInterfaceInfo.new_for_xml(ObjectManagerIface);
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const ObjectManager = new Lang.Class({
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Name: 'ObjectManager',
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_init: function(params) {
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params = Params.parse(params, { connection: null,
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name: null,
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objectPath: null,
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knownInterfaces: null,
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cancellable: null,
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onLoaded: null });
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this._connection = params.connection;
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this._serviceName = params.name;
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this._managerPath = params.objectPath;
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this._cancellable = params.cancellable;
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this._managerProxy = new Gio.DBusProxy({ g_connection: this._connection,
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g_interface_name: ObjectManagerInfo.name,
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g_interface_info: ObjectManagerInfo,
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g_name: this._serviceName,
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g_object_path: this._managerPath,
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g_flags: Gio.DBusProxyFlags.NONE });
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this._interfaceInfos = {};
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this._objects = {};
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this._interfaces = {};
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this._onLoaded = params.onLoaded;
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if (params.knownInterfaces)
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this._registerInterfaces(params.knownInterfaces);
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// Start out inhibiting load until at least the proxy
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// manager is loaded and the remote objects are fetched
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this._numLoadInhibitors = 1;
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this._managerProxy.init_async(GLib.PRIORITY_DEFAULT,
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this._cancellable,
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Lang.bind(this, this._onManagerProxyLoaded));
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},
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_tryToCompleteLoad: function() {
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this._numLoadInhibitors--;
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if (this._numLoadInhibitors == 0) {
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if (this._onLoaded)
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this._onLoaded();
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}
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},
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_addInterface: function(objectPath, interfaceName, onFinished) {
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let info = this._interfaceInfos[interfaceName];
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if (!info)
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return;
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let proxy = new Gio.DBusProxy({ g_connection: this._connection,
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g_name: this._serviceName,
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g_object_path: objectPath,
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g_interface_name: interfaceName,
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g_interface_info: info,
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g_flags: Gio.DBusProxyFlags.NONE });
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proxy.init_async(GLib.PRIORITY_DEFAULT,
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this._cancellable,
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Lang.bind(this, function(initable, result) {
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let error = null;
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try {
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initable.init_finish(result);
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} catch(e) {
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logError(e, 'could not initialize proxy for interface ' + interfaceName);
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if (onFinished)
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onFinished();
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return;
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}
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let isNewObject;
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if (!this._objects[objectPath]) {
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this._objects[objectPath] = {};
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isNewObject = true;
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} else {
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isNewObject = false;
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}
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this._objects[objectPath][interfaceName] = proxy;
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if (!this._interfaces[interfaceName])
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this._interfaces[interfaceName] = [];
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this._interfaces[interfaceName].push(proxy);
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if (isNewObject)
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this.emit('object-added', objectPath);
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this.emit('interface-added', interfaceName, proxy);
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if (onFinished)
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onFinished();
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}));
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},
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_removeInterface: function(objectPath, interfaceName) {
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if (!this._objects[objectPath])
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return;
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let proxy = this._objects[objectPath][interfaceName];
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if (this._interfaces[interfaceName]) {
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let index = this._interfaces[interfaceName].indexOf(proxy);
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if (index >= 0)
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this._interfaces[interfaceName].splice(index, 1);
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if (this._interfaces[interfaceName].length == 0)
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delete this._interfaces[interfaceName];
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}
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this.emit('interface-removed', interfaceName, proxy);
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this._objects[objectPath][interfaceName] = null;
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if (Object.keys(this._objects[objectPath]).length == 0) {
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delete this._objects[objectPath];
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this.emit('object-removed', objectPath);
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}
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},
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_onManagerProxyLoaded: function(initable, result) {
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let error = null;
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try {
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initable.init_finish(result);
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} catch(e) {
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logError(e, 'could not initialize object manager for object ' + params.name);
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this._tryToCompleteLoad();
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return;
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}
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this._managerProxy.connectSignal('InterfacesAdded',
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Lang.bind(this, function(objectManager, sender, [objectPath, interfaces]) {
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let interfaceNames = Object.keys(interfaces);
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for (let i = 0; i < interfaceNames.length; i++)
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this._addInterface(objectPath, interfaceNames[i]);
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}));
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this._managerProxy.connectSignal('InterfacesRemoved',
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Lang.bind(this, function(objectManager, sender, [objectPath, interfaceNames]) {
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for (let i = 0; i < interfaceNames.length; i++)
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this._removeInterface(objectPath, interfaceNames[i]);
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}));
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if (Object.keys(this._interfaceInfos).length == 0) {
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this._tryToCompleteLoad();
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return;
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}
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this._managerProxy.GetManagedObjectsRemote(Lang.bind(this, function(result, error) {
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if (!result) {
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if (error) {
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logError(error, 'could not get remote objects for service ' + this._serviceName + ' path ' + this._managerPath);
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}
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this._tryToCompleteLoad();
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return;
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}
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let [objects] = result;
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let objectPaths = Object.keys(objects);
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for (let i = 0; i < objectPaths.length; i++) {
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let objectPath = objectPaths[i];
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let object = objects[objectPath];
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let interfaceNames = Object.getOwnPropertyNames(object);
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for (let j = 0; j < interfaceNames.length; j++) {
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let interfaceName = interfaceNames[j];
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// Prevent load from completing until the interface is loaded
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this._numLoadInhibitors++;
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this._addInterface(objectPath,
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interfaceName,
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Lang.bind(this, this._tryToCompleteLoad));
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}
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}
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this._tryToCompleteLoad();
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}));
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},
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_registerInterfaces: function(interfaces) {
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for (let i = 0; i < interfaces.length; i++) {
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let info = Gio.DBusInterfaceInfo.new_for_xml(interfaces[i]);
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this._interfaceInfos[info.name] = info;
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}
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},
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getProxy: function(objectPath, interfaceName) {
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let object = this._objects[objectPath];
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if (!object)
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return null;
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return object[interfaceName];
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},
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getProxiesForInterface: function(interfaceName) {
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let proxyList = this._interfaces[interfaceName];
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if (!proxyList)
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return [];
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return proxyList;
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},
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getAllProxies: function() {
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let proxies = [];
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let objectPaths = Object.keys(this._objects);
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for (let i = 0; i < objectPaths.length; i++) {
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let object = this._objects[objectPaths];
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let interfaceNames = Object.keys(object);
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for (let j = 0; i < interfaceNames.length; i++) {
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let interfaceName = interfaceNames[i];
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if (object[interfaceName])
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proxies.push(object(interfaceName));
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}
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}
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return proxies;
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}
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});
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Signals.addSignalMethods(ObjectManager.prototype);
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