cloudeebus/cloudeebus.js

   1 /******************************************************************************
   2  * Copyright 2012 Intel Corporation.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  *****************************************************************************/
  16
  17
  18
  19 /*****************************************************************************/
  20
  21 var dbus = { // hook object for dbus types not translated by python-json
  22                 Double: function(value, level) {
  23                         return value;
  24                 }
  25 };
  26
  27
  28
  29 /*****************************************************************************/
  30
  31 var cloudeebus = window.cloudeebus = {version: "0.3.1"};
  32
  33 cloudeebus.reset = function() {
  34         cloudeebus.sessionBus = null;
  35         cloudeebus.systemBus = null;
  36         cloudeebus.wampSession = null;
  37         cloudeebus.uri = null;
  38 };
  39
  40
  41 cloudeebus.log = function(msg) {
  42 };
  43
  44
  45 cloudeebus.connect = function(uri, manifest, successCB, errorCB) {
  46         cloudeebus.reset();
  47         cloudeebus.uri = uri;
  48
  49         function onCloudeebusVersionCheckCB(version) {
  50                 if (cloudeebus.version == version) {
  51                         cloudeebus.log("Connected to " + cloudeebus.uri);
  52                         if (successCB)
  53                                 successCB();
  54                 } else {
  55                         var errorMsg = "Cloudeebus server version " + version + " and client version " + cloudeebus.version + " mismatch";
  56                         cloudeebus.log(errorMsg);
  57                         if (errorCB)
  58                                 errorCB(errorMsg);
  59                 }
  60         }
  61
  62         function onWAMPSessionAuthErrorCB(error) {
  63                 cloudeebus.log("Authentication error: " + error.desc);
  64                 if (errorCB)
  65                         errorCB(error.desc);
  66         }
  67
  68         function onWAMPSessionAuthenticatedCB(permissions) {
  69                 cloudeebus.sessionBus = new cloudeebus.BusConnection("session", cloudeebus.wampSession);
  70                 cloudeebus.systemBus = new cloudeebus.BusConnection("system", cloudeebus.wampSession);
  71                 cloudeebus.wampSession.call("getVersion").then(onCloudeebusVersionCheckCB, errorCB);
  72         }
  73
  74         function onWAMPSessionChallengedCB(challenge) {
  75                 var signature = cloudeebus.wampSession.authsign(challenge, manifest.key);
  76                 cloudeebus.wampSession.auth(signature).then(onWAMPSessionAuthenticatedCB, onWAMPSessionAuthErrorCB);
  77         }
  78
  79         function onWAMPSessionConnectedCB(session) {
  80                 cloudeebus.wampSession = session;
  81                 if (manifest)
  82                         cloudeebus.wampSession.authreq(
  83                                         manifest.name,
  84                                         {permissions: JSON.stringify(manifest.permissions)}
  85                                 ).then(onWAMPSessionChallengedCB, onWAMPSessionAuthErrorCB);
  86                 else
  87                         cloudeebus.wampSession.authreq().then(function() {
  88                                 cloudeebus.wampSession.auth().then(onWAMPSessionAuthenticatedCB, onWAMPSessionAuthErrorCB);
  89                                 }, onWAMPSessionAuthErrorCB);
  90         }
  91
  92         function onWAMPSessionErrorCB(code, reason) {
  93                 if (code == ab.CONNECTION_UNSUPPORTED) {
  94                         cloudeebus.log("Browser is not supported");
  95                 }
  96                 else {
  97                         cloudeebus.log("Failed to open session, code = " + code + ", reason = " + reason);
  98                 }
  99                 if (errorCB)
 100                         errorCB(reason);
 101         }
 102
 103         return ab.connect(cloudeebus.uri, onWAMPSessionConnectedCB, onWAMPSessionErrorCB);
 104 };
 105
 106
 107 cloudeebus.SessionBus = function() {
 108         return cloudeebus.sessionBus;
 109 };
 110
 111
 112 cloudeebus.SystemBus = function() {
 113         return cloudeebus.systemBus;
 114 };
 115
 116
 117
 118 /*****************************************************************************/
 119
 120 cloudeebus.BusConnection = function(name, session) {
 121         this.name = name;
 122         this.wampSession = session;
 123         return this;
 124 };
 125
 126
 127 cloudeebus.BusConnection.prototype.getObject = function(busName, objectPath, introspectCB, errorCB) {
 128         var proxy = new cloudeebus.ProxyObject(this.wampSession, this, busName, objectPath);
 129         if (introspectCB)
 130                 proxy._introspect(introspectCB, errorCB);
 131         return proxy;
 132 };
 133
 134
 135
 136 /*****************************************************************************/
 137
 138 cloudeebus.Request = function(proxy, onsuccess, onerror) {
 139         this.proxy = proxy;
 140         this.error = null;
 141         this.result = null;
 142         this.onsuccess = onsuccess;
 143         this.onerror = onerror;
 144     return this;
 145 };
 146
 147 cloudeebus.Request.prototype.then = function(onsuccess, onerror) {
 148         this.onsuccess = onsuccess;
 149         this.onerror = onerror;
 150         return this;
 151 };
 152
 153
 154
 155 /*****************************************************************************/
 156
 157 cloudeebus.ProxyObject = function(session, busConnection, busName, objectPath) {
 158         this.wampSession = session;
 159         this.busConnection = busConnection;
 160         this.busName = busName;
 161         this.objectPath = objectPath;
 162         this.interfaceProxies = {};
 163         return this;
 164 };
 165
 166
 167 cloudeebus.ProxyObject.prototype.getInterface = function(ifName) {
 168         return this.interfaceProxies[ifName];
 169 };
 170
 171
 172 cloudeebus.ProxyObject.prototype._introspect = function(successCB, errorCB) {
 173
 174         var self = this;
 175
 176         function getAllPropertiesSuccessCB(props) {
 177                 var ifProxy = self.interfaceProxies[self.propInterfaces[self.propInterfaces.length-1]];
 178                 for (var prop in props)
 179                         ifProxy[prop] = self[prop] = props[prop];
 180                 getAllPropertiesNextInterfaceCB();
 181         }
 182
 183         function getAllPropertiesNextInterfaceCB() {
 184                 self.propInterfaces.pop();
 185                 if (self.propInterfaces.length > 0)
 186                         self.callMethod("org.freedesktop.DBus.Properties",
 187                                 "GetAll",
 188                                 [self.propInterfaces[self.propInterfaces.length-1]]).then(getAllPropertiesSuccessCB,
 189                                 errorCB ? errorCB : getAllPropertiesNextInterfaceCB);
 190                 else {
 191                         self.propInterfaces = null;
 192                         if (successCB)
 193                                 successCB(self);
 194                 }
 195         }
 196
 197         function introspectSuccessCB(str) {
 198                 var parser = new DOMParser();
 199                 var xmlDoc = parser.parseFromString(str, "text/xml");
 200                 var interfaces = xmlDoc.getElementsByTagName("interface");
 201                 self.propInterfaces = [];
 202                 var supportDBusProperties = false;
 203                 for (var i=0; i < interfaces.length; i++) {
 204                         var ifName = interfaces[i].attributes.getNamedItem("name").value;
 205                         self.interfaceProxies[ifName] = new cloudeebus.ProxyObject(self.wampSession, self.busConnection, self.busName, self.objectPath);
 206                         if (ifName == "org.freedesktop.DBus.Properties")
 207                                 supportDBusProperties = true;
 208                         var hasProperties = false;
 209                         var ifChild = interfaces[i].firstChild;
 210                         while (ifChild) {
 211                                 if (ifChild.nodeName == "method") {
 212                                         var nArgs = 0;
 213                                         var metChild = ifChild.firstChild;
 214                                         while (metChild) {
 215                                                 if (metChild.nodeName == "arg" &&
 216                                                         metChild.attributes.getNamedItem("direction").value == "in")
 217                                                                 nArgs++;
 218                                                 metChild = metChild.nextSibling;
 219                                         }
 220                                         var metName = ifChild.attributes.getNamedItem("name").value;
 221                                         if (!self[metName])
 222                                                 self._addMethod(ifName, metName, nArgs);
 223                                         self.interfaceProxies[ifName]._addMethod(ifName, metName, nArgs);
 224                                 }
 225                                 else if (ifChild.nodeName == "property") {
 226                                         if (!hasProperties)
 227                                                 self.propInterfaces.push(ifName);
 228                                         hasProperties = true;
 229                                 }
 230                                 ifChild = ifChild.nextSibling;
 231                         }
 232                 }
 233                 if (supportDBusProperties && self.propInterfaces.length > 0) {
 234                         self.callMethod("org.freedesktop.DBus.Properties",
 235                                 "GetAll",
 236                                 [self.propInterfaces[self.propInterfaces.length-1]]).then(getAllPropertiesSuccessCB,
 237                                 errorCB ? errorCB : getAllPropertiesNextInterfaceCB);
 238                 }
 239                 else {
 240                         self.propInterfaces = null;
 241                         if (successCB)
 242                                 successCB(self);
 243                 }
 244         }
 245
 246         // call Introspect on self
 247         self.callMethod("org.freedesktop.DBus.Introspectable", "Introspect", []).then(introspectSuccessCB, errorCB);
 248 };
 249
 250
 251 cloudeebus.ProxyObject.prototype._addMethod = function(ifName, method, nArgs) {
 252
 253         var self = this;
 254
 255         self[method] = function() {
 256                 var args = [];
 257                 for (var i=0; i < nArgs; i++ )
 258                         args.push(arguments[i]);
 259                 return self.callMethod(ifName, method, args);
 260         };
 261 };
 262
 263 cloudeebus.ProxyObject.prototype.callMethod = function(ifName, method, args) {
 264
 265         var self = this;
 266         var request = new cloudeebus.Request(this);
 267
 268         function callMethodSuccessCB(str) {
 269                 request.result = eval(str);
 270                 if (request.onsuccess) {
 271                         try { // calling dbus hook object function for un-translated types
 272                                 request.onsuccess.apply(request, request.result);
 273                         }
 274                         catch (e) {
 275                                 cloudeebus.log("Method callback exception: " + e);
 276                                 request.error = e;
 277                                 if (request.onerror)
 278                                         request.onerror.apply(request, e);
 279                         }
 280                 }
 281         }
 282
 283         function callMethodErrorCB(error) {
 284                 cloudeebus.log("Error calling method: " + method + " on object: " + self.objectPath + " : " + error.desc);
 285                 request.error = error.desc;
 286                 if (request.onerror)
 287                         request.onerror.apply(request, request.error);
 288         }
 289
 290         var arglist = [
 291                 self.busConnection.name,
 292                 self.busName,
 293                 self.objectPath,
 294                 ifName,
 295                 method,
 296                 JSON.stringify(args)
 297         ];
 298
 299         // call dbusSend with bus type, destination, object, message and arguments
 300         self.wampSession.call("dbusSend", arglist).then(callMethodSuccessCB, callMethodErrorCB);
 301         return request;
 302 };
 303
 304
 305 cloudeebus.ProxyObject.prototype.connectToSignal = function(ifName, signal, successCB, errorCB) {
 306
 307         var self = this;
 308
 309         function signalHandler(id, data) {
 310                 if (successCB) {
 311                         try { // calling dbus hook object function for un-translated types
 312                                 successCB.apply(self, eval(data));
 313                         }
 314                         catch (e) {
 315                                 cloudeebus.log("Signal handler exception: " + e);
 316                                 if (errorCB)
 317                                         errorCB(e);
 318                         }
 319                 }
 320         }
 321
 322         function connectToSignalSuccessCB(str) {
 323                 try {
 324                         self.wampSession.subscribe(str, signalHandler);
 325                 }
 326                 catch (e) {
 327                         cloudeebus.log("Subscribe error: " + e);
 328                 }
 329         }
 330
 331         function connectToSignalErrorCB(error) {
 332                 cloudeebus.log("Error connecting to signal: " + signal + " on object: " + self.objectPath + " : " + error.desc);
 333                 if (errorCB)
 334                         errorCB(error.desc);
 335         }
 336
 337         var arglist = [
 338                 self.busConnection.name,
 339                 self.busName,
 340                 self.objectPath,
 341                 ifName,
 342                 signal
 343         ];
 344
 345         // call dbusSend with bus type, destination, object, message and arguments
 346         self.wampSession.call("dbusRegister", arglist).then(connectToSignalSuccessCB, connectToSignalErrorCB);
 347 };
 348
 349
 350 cloudeebus.ProxyObject.prototype.disconnectSignal = function(ifName, signal) {
 351         try {
 352                 this.wampSession.unsubscribe(this.busConnection.name + "#" + this.busName + "#" + this.objectPath + "#" + ifName + "#" + signal);
 353         }
 354         catch (e) {
 355                 cloudeebus.log("Unsubscribe error: " + e);
 356         }
 357 };