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.ProxyObject = function(session, busConnection, busName, objectPath) {
 139         this.wampSession = session;
 140         this.busConnection = busConnection;
 141         this.busName = busName;
 142         this.objectPath = objectPath;
 143         this.interfaceProxies = {};
 144         return this;
 145 };
 146
 147
 148 cloudeebus.ProxyObject.prototype.getInterface = function(ifName) {
 149         return this.interfaceProxies[ifName];
 150 };
 151
 152
 153 cloudeebus.ProxyObject.prototype._introspect = function(successCB, errorCB) {
 154
 155         var self = this;
 156
 157         function getAllPropertiesSuccessCB(props) {
 158                 var ifProxy = self.interfaceProxies[self.propInterfaces[self.propInterfaces.length-1]];
 159                 for (var prop in props)
 160                         ifProxy[prop] = self[prop] = props[prop];
 161                 getAllPropertiesNextInterfaceCB();
 162         }
 163
 164         function getAllPropertiesNextInterfaceCB() {
 165                 self.propInterfaces.pop();
 166                 if (self.propInterfaces.length > 0)
 167                         self.callMethod("org.freedesktop.DBus.Properties",
 168                                 "GetAll",
 169                                 [self.propInterfaces[self.propInterfaces.length-1]],
 170                                 getAllPropertiesSuccessCB,
 171                                 errorCB ? errorCB : getAllPropertiesNextInterfaceCB);
 172                 else {
 173                         self.propInterfaces = null;
 174                         if (successCB)
 175                                 successCB(self);
 176                 }
 177         }
 178
 179         function introspectSuccessCB(str) {
 180                 var parser = new DOMParser();
 181                 var xmlDoc = parser.parseFromString(str, "text/xml");
 182                 var interfaces = xmlDoc.getElementsByTagName("interface");
 183                 self.propInterfaces = [];
 184                 var supportDBusProperties = false;
 185                 for (var i=0; i < interfaces.length; i++) {
 186                         var ifName = interfaces[i].attributes.getNamedItem("name").value;
 187                         self.interfaceProxies[ifName] = new cloudeebus.ProxyObject(self.wampSession, self.busConnection, self.busName, self.objectPath);
 188                         if (ifName == "org.freedesktop.DBus.Properties")
 189                                 supportDBusProperties = true;
 190                         var hasProperties = false;
 191                         var ifChild = interfaces[i].firstChild;
 192                         while (ifChild) {
 193                                 if (ifChild.nodeName == "method") {
 194                                         var nArgs = 0;
 195                                         var metChild = ifChild.firstChild;
 196                                         while (metChild) {
 197                                                 if (metChild.nodeName == "arg" &&
 198                                                         metChild.attributes.getNamedItem("direction").value == "in")
 199                                                                 nArgs++;
 200                                                 metChild = metChild.nextSibling;
 201                                         }
 202                                         var metName = ifChild.attributes.getNamedItem("name").value;
 203                                         if (!self[metName])
 204                                                 self._addMethod(ifName, metName, nArgs);
 205                                         self.interfaceProxies[ifName]._addMethod(ifName, metName, nArgs);
 206                                 }
 207                                 else if (ifChild.nodeName == "property") {
 208                                         if (!hasProperties)
 209                                                 self.propInterfaces.push(ifName);
 210                                         hasProperties = true;
 211                                 }
 212                                 ifChild = ifChild.nextSibling;
 213                         }
 214                 }
 215                 if (supportDBusProperties && self.propInterfaces.length > 0) {
 216                         self.callMethod("org.freedesktop.DBus.Properties",
 217                                 "GetAll",
 218                                 [self.propInterfaces[self.propInterfaces.length-1]],
 219                                 getAllPropertiesSuccessCB,
 220                                 errorCB ? errorCB : getAllPropertiesNextInterfaceCB);
 221                 }
 222                 else {
 223                         self.propInterfaces = null;
 224                         if (successCB)
 225                                 successCB(self);
 226                 }
 227         }
 228
 229         // call Introspect on self
 230         self.callMethod("org.freedesktop.DBus.Introspectable", "Introspect", [], introspectSuccessCB, errorCB);
 231 };
 232
 233
 234 cloudeebus.ProxyObject.prototype._addMethod = function(ifName, method, nArgs) {
 235
 236         var self = this;
 237
 238         self[method] = function() {
 239                 if (arguments.length < nArgs || arguments.length > nArgs + 2)
 240                         throw "Error: method " + method + " takes " + nArgs + " parameters, got " + arguments.length + ".";
 241                 var args = [];
 242                 var successCB = null;
 243                 var errorCB = null;
 244                 for (var i=0; i < nArgs; i++ )
 245                         args.push(arguments[i]);
 246                 if (arguments.length > nArgs)
 247                         successCB = arguments[nArgs];
 248                 if (arguments.length > nArgs + 1)
 249                         errorCB = arguments[nArgs + 1];
 250                 self.callMethod(ifName, method, args, successCB, errorCB);
 251         };
 252
 253 };
 254
 255
 256 cloudeebus.ProxyObject.prototype.callMethod = function(ifName, method, args, successCB, errorCB) {
 257
 258         var self = this;
 259
 260         function callMethodSuccessCB(str) {
 261                 if (successCB) {
 262                         try { // calling dbus hook object function for un-translated types
 263                                 successCB.apply(self, eval(str));
 264                         }
 265                         catch (e) {
 266                                 cloudeebus.log("Method callback exception: " + e);
 267                                 if (errorCB)
 268                                         errorCB(e);
 269                         }
 270                 }
 271         }
 272
 273         function callMethodErrorCB(error) {
 274                 cloudeebus.log("Error calling method: " + method + " on object: " + self.objectPath + " : " + error.desc);
 275                 if (errorCB)
 276                         errorCB(error.desc);
 277         }
 278
 279         var arglist = [
 280                 self.busConnection.name,
 281                 self.busName,
 282                 self.objectPath,
 283                 ifName,
 284                 method,
 285                 JSON.stringify(args)
 286         ];
 287
 288         // call dbusSend with bus type, destination, object, message and arguments
 289         self.wampSession.call("dbusSend", arglist).then(callMethodSuccessCB, callMethodErrorCB);
 290 };
 291
 292
 293 cloudeebus.ProxyObject.prototype.connectToSignal = function(ifName, signal, successCB, errorCB) {
 294
 295         var self = this;
 296
 297         function signalHandler(id, data) {
 298                 if (successCB) {
 299                         try { // calling dbus hook object function for un-translated types
 300                                 successCB.apply(self, eval(data));
 301                         }
 302                         catch (e) {
 303                                 cloudeebus.log("Signal handler exception: " + e);
 304                                 if (errorCB)
 305                                         errorCB(e);
 306                         }
 307                 }
 308         }
 309
 310         function connectToSignalSuccessCB(str) {
 311                 try {
 312                         self.wampSession.subscribe(str, signalHandler);
 313                 }
 314                 catch (e) {
 315                         cloudeebus.log("Subscribe error: " + e);
 316                 }
 317         }
 318
 319         function connectToSignalErrorCB(error) {
 320                 cloudeebus.log("Error connecting to signal: " + signal + " on object: " + self.objectPath + " : " + error.desc);
 321                 if (errorCB)
 322                         errorCB(error.desc);
 323         }
 324
 325         var arglist = [
 326                 self.busConnection.name,
 327                 self.busName,
 328                 self.objectPath,
 329                 ifName,
 330                 signal
 331         ];
 332
 333         // call dbusSend with bus type, destination, object, message and arguments
 334         self.wampSession.call("dbusRegister", arglist).then(connectToSignalSuccessCB, connectToSignalErrorCB);
 335 };
 336
 337
 338 cloudeebus.ProxyObject.prototype.disconnectSignal = function(ifName, signal) {
 339         try {
 340                 this.wampSession.unsubscribe(this.busConnection.name + "#" + this.busName + "#" + this.objectPath + "#" + ifName + "#" + signal);
 341         }
 342         catch (e) {
 343                 cloudeebus.log("Unsubscribe error: " + e);
 344         }
 345 };