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: "0.2"};
  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         return this;
 144 };
 145
 146
 147 cloudeebus.ProxyObject.prototype._introspect = function(successCB, errorCB) {
 148
 149         var self = this;
 150
 151         function getAllPropertiesSuccessCB(props) {
 152                 for (var prop in props)
 153                         self[prop] = props[prop];
 154                 getAllPropertiesNextInterfaceCB();
 155         }
 156
 157         function getAllPropertiesNextInterfaceCB() {
 158                 if (self.propInterfaces.length > 0)
 159                         self.callMethod("org.freedesktop.DBus.Properties",
 160                                 "GetAll",
 161                                 [self.propInterfaces.pop()],
 162                                 getAllPropertiesSuccessCB,
 163                                 errorCB ? errorCB : getAllPropertiesNextInterfaceCB);
 164                 else {
 165                         self.propInterfaces = null;
 166                         if (successCB)
 167                                 successCB(self);
 168                 }
 169         }
 170
 171         function introspectSuccessCB(str) {
 172                 var parser = new DOMParser();
 173                 var xmlDoc = parser.parseFromString(str, "text/xml");
 174                 var interfaces = xmlDoc.getElementsByTagName("interface");
 175                 self.propInterfaces = [];
 176                 var supportDBusProperties = false;
 177                 for (var i=0; i < interfaces.length; i++) {
 178                         var ifName = interfaces[i].attributes.getNamedItem("name").value;
 179                         if (ifName == "org.freedesktop.DBus.Properties")
 180                                 supportDBusProperties = true;
 181                         var hasProperties = false;
 182                         var ifChild = interfaces[i].firstChild;
 183                         while (ifChild) {
 184                                 if (ifChild.nodeName == "method") {
 185                                         var nArgs = 0;
 186                                         var metChild = ifChild.firstChild;
 187                                         while (metChild) {
 188                                                 if (metChild.nodeName == "arg" &&
 189                                                         metChild.attributes.getNamedItem("direction").value == "in")
 190                                                                 nArgs++;
 191                                                 metChild = metChild.nextSibling;
 192                                         }
 193                                         self._addMethod(ifName,
 194                                                         ifChild.attributes.getNamedItem("name").value,
 195                                                         nArgs);
 196                                 }
 197                                 else if (ifChild.nodeName == "property") {
 198                                         if (!hasProperties)
 199                                                 self.propInterfaces.push(ifName);
 200                                         hasProperties = true;
 201                                 }
 202                                 ifChild = ifChild.nextSibling;
 203                         }
 204                 }
 205                 if (supportDBusProperties && self.propInterfaces.length > 0) {
 206                         self.callMethod("org.freedesktop.DBus.Properties",
 207                                 "GetAll",
 208                                 [self.propInterfaces.pop()],
 209                                 getAllPropertiesSuccessCB,
 210                                 errorCB ? errorCB : getAllPropertiesNextInterfaceCB);
 211                 }
 212                 else {
 213                         self.propInterfaces = null;
 214                         if (successCB)
 215                                 successCB(self);
 216                 }
 217         }
 218
 219         // call Introspect on self
 220         self.callMethod("org.freedesktop.DBus.Introspectable", "Introspect", [], introspectSuccessCB, errorCB);
 221 };
 222
 223
 224 cloudeebus.ProxyObject.prototype._addMethod = function(ifName, method, nArgs) {
 225
 226         var self = this;
 227
 228         self[method] = function() {
 229                 if (arguments.length < nArgs || arguments.length > nArgs + 2)
 230                         throw "Error: method " + method + " takes " + nArgs + " parameters, got " + arguments.length + ".";
 231                 var args = [];
 232                 var successCB = null;
 233                 var errorCB = null;
 234                 for (var i=0; i < nArgs; i++ )
 235                         args.push(arguments[i]);
 236                 if (arguments.length > nArgs)
 237                         successCB = arguments[nArgs];
 238                 if (arguments.length > nArgs + 1)
 239                         errorCB = arguments[nArgs + 1];
 240                 self.callMethod(ifName, method, args, successCB, errorCB);
 241         };
 242
 243 };
 244
 245
 246 cloudeebus.ProxyObject.prototype.callMethod = function(ifName, method, args, successCB, errorCB) {
 247
 248         var self = this;
 249
 250         function callMethodSuccessCB(str) {
 251                 if (successCB) {
 252                         try { // calling dbus hook object function for un-translated types
 253                                 successCB.apply(self, eval(str));
 254                         }
 255                         catch (e) {
 256                                 cloudeebus.log("Method callback exception: " + e);
 257                                 if (errorCB)
 258                                         errorCB(e);
 259                         }
 260                 }
 261         }
 262
 263         function callMethodErrorCB(error) {
 264                 cloudeebus.log("Error calling method: " + method + " on object: " + self.objectPath + " : " + error.desc);
 265                 if (errorCB)
 266                         errorCB(error.desc);
 267         }
 268
 269         var arglist = [
 270                 self.busConnection.name,
 271                 self.busName,
 272                 self.objectPath,
 273                 ifName,
 274                 method,
 275                 JSON.stringify(args)
 276         ];
 277
 278         // call dbusSend with bus type, destination, object, message and arguments
 279         self.wampSession.call("dbusSend", arglist).then(callMethodSuccessCB, callMethodErrorCB);
 280 };
 281
 282
 283 cloudeebus.ProxyObject.prototype.connectToSignal = function(ifName, signal, successCB, errorCB) {
 284
 285         var self = this;
 286
 287         function signalHandler(id, data) {
 288                 if (successCB) {
 289                         try { // calling dbus hook object function for un-translated types
 290                                 successCB.apply(self, eval(data));
 291                         }
 292                         catch (e) {
 293                                 cloudeebus.log("Signal handler exception: " + e);
 294                                 if (errorCB)
 295                                         errorCB(e);
 296                         }
 297                 }
 298         }
 299
 300         function connectToSignalSuccessCB(str) {
 301                 try {
 302                         self.wampSession.subscribe(str, signalHandler);
 303                 }
 304                 catch (e) {
 305                         cloudeebus.log("Subscribe error: " + e);
 306                 }
 307         }
 308
 309         function connectToSignalErrorCB(error) {
 310                 cloudeebus.log("Error connecting to signal: " + signal + " on object: " + self.objectPath + " : " + error.desc);
 311                 if (errorCB)
 312                         errorCB(error.desc);
 313         }
 314
 315         var arglist = [
 316                 self.busConnection.name,
 317                 self.busName,
 318                 self.objectPath,
 319                 ifName,
 320                 signal
 321         ];
 322
 323         // call dbusSend with bus type, destination, object, message and arguments
 324         self.wampSession.call("dbusRegister", arglist).then(connectToSignalSuccessCB, connectToSignalErrorCB);
 325 };
 326
 327
 328 cloudeebus.ProxyObject.prototype.disconnectSignal = function(ifName, signal) {
 329         try {
 330                 this.wampSession.unsubscribe(this.busName + "#" + this.objectPath + "#" + ifName + "#" + signal);
 331         }
 332         catch (e) {
 333                 cloudeebus.log("Unsubscribe error: " + e);
 334         }
 335 };