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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const { classes: Cc, interfaces: Ci, results: Cr, utils: Cu } = Components;
Cu.import('resource://gre/modules/Services.jsm');
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/MulticastDNS.jsm");
const DNSSERVICEDISCOVERY_CID = Components.ID("{f9346d98-f27a-4e89-b744-493843416480}");
const DNSSERVICEDISCOVERY_CONTRACT_ID = "@mozilla.org/toolkit/components/mdnsresponder/dns-sd;1";
const DNSSERVICEINFO_CONTRACT_ID = "@mozilla.org/toolkit/components/mdnsresponder/dns-info;1";
function log(aMsg) {
dump("-*- nsDNSServiceDiscovery.js : " + aMsg + "\n");
}
function generateUuid() {
var uuidGenerator = Components.classes["@mozilla.org/uuid-generator;1"].
getService(Ci.nsIUUIDGenerator);
return uuidGenerator.generateUUID().toString();
}
// Helper class to transform return objects to correct type.
function ListenerWrapper(aListener, aMdns) {
this.listener = aListener;
this.mdns = aMdns;
this.discoveryStarting = false;
this.stopDiscovery = false;
this.registrationStarting = false;
this.stopRegistration = false;
this.uuid = generateUuid();
}
ListenerWrapper.prototype = {
// Helper function for transforming an Object into nsIDNSServiceInfo.
makeServiceInfo: function (aServiceInfo) {
let serviceInfo = Cc[DNSSERVICEINFO_CONTRACT_ID].createInstance(Ci.nsIDNSServiceInfo);
for (let name of ['host', 'address', 'port', 'serviceName', 'serviceType']) {
try {
serviceInfo[name] = aServiceInfo[name];
} catch (e) {
// ignore exceptions
}
}
let attributes;
try {
attributes = _toPropertyBag2(aServiceInfo.attributes);
} catch (err) {
// Ignore unset attributes in object.
log("Caught unset attributes error: " + err + " - " + err.stack);
attributes = Cc['@mozilla.org/hash-property-bag;1']
.createInstance(Ci.nsIWritablePropertyBag2);
}
serviceInfo.attributes = attributes;
return serviceInfo;
},
/* transparent types */
onDiscoveryStarted: function(aServiceType) {
this.discoveryStarting = false;
this.listener.onDiscoveryStarted(aServiceType);
if (this.stopDiscovery) {
this.mdns.stopDiscovery(aServiceType, this);
}
},
onDiscoveryStopped: function(aServiceType) {
this.listener.onDiscoveryStopped(aServiceType);
},
onStartDiscoveryFailed: function(aServiceType, aErrorCode) {
log('onStartDiscoveryFailed: ' + aServiceType + ' (' + aErrorCode + ')');
this.discoveryStarting = false;
this.stopDiscovery = true;
this.listener.onStartDiscoveryFailed(aServiceType, aErrorCode);
},
onStopDiscoveryFailed: function(aServiceType, aErrorCode) {
log('onStopDiscoveryFailed: ' + aServiceType + ' (' + aErrorCode + ')');
this.listener.onStopDiscoveryFailed(aServiceType, aErrorCode);
},
/* transform types */
onServiceFound: function(aServiceInfo) {
this.listener.onServiceFound(this.makeServiceInfo(aServiceInfo));
},
onServiceLost: function(aServiceInfo) {
this.listener.onServiceLost(this.makeServiceInfo(aServiceInfo));
},
onServiceRegistered: function(aServiceInfo) {
this.registrationStarting = false;
this.listener.onServiceRegistered(this.makeServiceInfo(aServiceInfo));
if (this.stopRegistration) {
this.mdns.unregisterService(aServiceInfo, this);
}
},
onServiceUnregistered: function(aServiceInfo) {
this.listener.onServiceUnregistered(this.makeServiceInfo(aServiceInfo));
},
onServiceResolved: function(aServiceInfo) {
this.listener.onServiceResolved(this.makeServiceInfo(aServiceInfo));
},
onRegistrationFailed: function(aServiceInfo, aErrorCode) {
log('onRegistrationFailed: (' + aErrorCode + ')');
this.registrationStarting = false;
this.stopRegistration = true;
this.listener.onRegistrationFailed(this.makeServiceInfo(aServiceInfo), aErrorCode);
},
onUnregistrationFailed: function(aServiceInfo, aErrorCode) {
log('onUnregistrationFailed: (' + aErrorCode + ')');
this.listener.onUnregistrationFailed(this.makeServiceInfo(aServiceInfo), aErrorCode);
},
onResolveFailed: function(aServiceInfo, aErrorCode) {
log('onResolveFailed: (' + aErrorCode + ')');
this.listener.onResolveFailed(this.makeServiceInfo(aServiceInfo), aErrorCode);
}
};
function nsDNSServiceDiscovery() {
log("nsDNSServiceDiscovery");
this.mdns = new MulticastDNS();
}
nsDNSServiceDiscovery.prototype = {
classID: DNSSERVICEDISCOVERY_CID,
QueryInterface: XPCOMUtils.generateQI([Ci.nsISupportsWeakReference, Ci.nsIDNSServiceDiscovery]),
startDiscovery: function(aServiceType, aListener) {
log("startDiscovery");
let listener = new ListenerWrapper(aListener, this.mdns);
listener.discoveryStarting = true;
this.mdns.startDiscovery(aServiceType, listener);
return {
QueryInterface: XPCOMUtils.generateQI([Ci.nsICancelable]),
cancel: (function() {
if (this.discoveryStarting || this.stopDiscovery) {
this.stopDiscovery = true;
return;
}
this.mdns.stopDiscovery(aServiceType, listener);
}).bind(listener)
};
},
registerService: function(aServiceInfo, aListener) {
log("registerService");
let listener = new ListenerWrapper(aListener, this.mdns);
listener.registrationStarting = true;
this.mdns.registerService(aServiceInfo, listener);
return {
QueryInterface: XPCOMUtils.generateQI([Ci.nsICancelable]),
cancel: (function() {
if (this.registrationStarting || this.stopRegistration) {
this.stopRegistration = true;
return;
}
this.mdns.unregisterService(aServiceInfo, listener);
}).bind(listener)
};
},
resolveService: function(aServiceInfo, aListener) {
log("resolveService");
this.mdns.resolveService(aServiceInfo, new ListenerWrapper(aListener));
}
};
this.NSGetFactory = XPCOMUtils.generateNSGetFactory([nsDNSServiceDiscovery]);
function _toPropertyBag2(obj)
{
if (obj.QueryInterface) {
return obj.QueryInterface(Ci.nsIPropertyBag2);
}
let result = Cc['@mozilla.org/hash-property-bag;1']
.createInstance(Ci.nsIWritablePropertyBag2);
for (let name in obj) {
result.setPropertyAsAString(name, obj[name]);
}
return result;
}
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