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dbus.js
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dbus.js
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var
DOM = require('com.izaakschroeder.dom'),
util = require('util'),
dbus = require('./build/Release/dbus'),
EventEmitter = require('events').EventEmitter;
/**
* DBus
* This wraps a bus object.
*/
function DBus(bus, destination) {
switch(typeof bus) {
case "number":
this.backend = dbus.get(bus);
break;
case "object":
this.backend = bus;
break;
}
this.destination = destination;
var self = this;
process.on("exit", function() {
self.close();
})
}
DBus.SYSTEM = dbus.DBUS_BUS_SYSTEM;
DBus.SESSION = dbus.DBUS_BUS_SESSION;
DBus.get = function(bus, destination) {
return new DBus(bus, destination);
}
DBus.system = DBus.get.bind(undefined, DBus.SYSTEM);
DBus.session = DBus.get.bind(undefined, DBus.SESSION);
DBus.prototype.close = function() {
this.backend.close();
}
DBus.prototype.object = function(path) {
return new DBusObject(this, path);
}
/**
* DBusObject
* Wraps a DBus object.
*
*/
function DBusObject(bus, path) {
EventEmitter.call(this);
this.bus = bus;
this.path = path;
this.introspection = undefined;
var self = this;
//Call the C++ code to register the object path and appropriate callback
bus.backend.registerObjectPath(path, (function(message) {
//Look at the type of message
switch(message.type) {
case dbus.DBUS_MESSAGE_TYPE_SIGNAL: //If it's a signal
//Emit it
var args = [(message.interface+"."+message.member).toLowerCase()];
Array.prototype.push.apply(args, message.arguments);
this.emit.apply(this, args);
break;
case dbus.DBUS_MESSAGE_TYPE_ERROR:
this.emit("error");
default:
break;
}
delete message;
}).bind(this))
}
util.inherits(DBusObject, EventEmitter);
DBusObject.prototype.introspect = function(callback) {
if (this.introspection)
return this.introspection;
var self = this, message = dbus.methodCall(this.bus.destination, this.path, "org.freedesktop.DBus.Introspectable", "Introspect");
this.bus.backend.send(message, -1, function(response) {
DOM.parse(response.arguments[0], function(doc) {
var res = { interfaces: { } };
doc.querySelectorAll("interface").forEach(function(iface) {
var out = {
name: iface.getAttribute("name"),
methods: [ ],
signals: [ ]
};
iface.querySelectorAll("method").forEach(function(method) {
var m = {
name: method.getAttribute("name"),
inputs: [ ],
outputs: [ ]
};
method.querySelectorAll("arg[direction=in]").forEach(function(arg) {
m.inputs.push({ name: arg.getAttribute("name"), type: arg.getAttribute("type") })
})
method.querySelectorAll("arg[direction=out]").forEach(function(arg) {
m.outputs.push({ name: arg.getAttribute("name"), type: arg.getAttribute("type") })
})
out.methods.push(m);
})
iface.querySelectorAll("signal").forEach(function(signal) {
var m = {
name: signal.getAttribute("name"),
arguments: [ ]
};
signal.querySelectorAll("arg").forEach(function(arg) {
m.arguments.push({ name: arg.getAttribute("name"), type: arg.getAttribute("type") })
})
out.signals.push(m);
})
res.interfaces[out.name] = out;
})
self.introspection = res;
callback(res);
});
})
}
DBusObject.prototype.as = function(interfaceName) {
return new DBusProxy(this, interfaceName);
}
function DBusProxy(object, interfaceName) {
if (typeof interfaceName !== "string")
throw new TypeError("Interface must be a string!");
EventEmitter.call(this);
var self = this;
this.bus = object.bus;
this.interfaceName = interfaceName;
this.object = object;
object.introspect(function(data) {
var dbusInterface = data.interfaces[interfaceName];
if (typeof dbusInterface === "undefined")
throw new Error("Unable to get interface "+interfaceName+"!");
dbusInterface.methods.forEach(function(method) {
var name = method.name;
name = name.charAt(0).toLowerCase() + name.slice(1);
self[name] = function() {
var message = dbus.methodCall(self.bus.destination, object.path, dbusInterface.name, method.name), callback = arguments[arguments.length - 1];
if (typeof callback !== "function")
throw new TypeError("Callback must be a function!");
message.signature = method.inputs.map(function(i) { return i.type }).join("");
message.arguments = Array.prototype.slice.call(arguments, 0, -1);
self.bus.backend.send(message, -1, (function(callback, reply) {
switch(reply.type) {
case dbus.DBUS_MESSAGE_TYPE_METHOD_RETURN:
var results = !reply.arguments ? [] : Array.prototype.slice.call(reply.arguments).map(function(arg, i) {
var signature = method.outputs[i];
if (signature.type === "o") {
return self.bus.object(arg);
}
return arg;
});
results.unshift(undefined);
callback.apply(undefined, results);
break;
case dbus.DBUS_MESSAGE_TYPE_ERROR:
callback(reply.error);
break;
case dbus.DBUS_MESSAGE_TYPE_INVALID:
case dbus.DBUS_MESSAGE_TYPE_METHOD_CALL:
case dbus.DBUS_MESSAGE_TYPE_SIGNAL:
console.log("INVALID");
break;
}
}).bind(undefined, callback))
}
})
self.emit("ready");
})
}
util.inherits(DBusProxy, EventEmitter)
DBusProxy.prototype.on = function(method, listener) {
var self = this, event = (this.interfaceName+"."+method).toLowerCase();
this.object.on(event, function() {
var args = [method];
Array.prototype.push.apply(args, arguments);
self.emit.apply(self, args);
})
return EventEmitter.prototype.on.apply(this, arguments);
}
module.exports = DBus;