adds basic wrapper to announce services with avahi

avahi/index.js

@@ -0,0 +1,59 @@
+var mdns   = require('mdns2'),
+    uuid   = require('node-uuid'),
+    logger = require("../logger")().addLogger('avahi')
+;
+
+/*
+ * Basic helper to announce services using mdns / avahi.
+ *
+ * client_id is an unique token used to identify this particular instance. If
+ * not given, an uuid is created.
+ * namespace is the prefix used to distinguish the services. Defaults to 'MBC'
+ */
+var avahi = exports = module.exports = function (client_id, namespace) {
+    var self = this;
+
+    self.client_id = client_id || uuid.v4();
+    self.namespace = namespace || 'MBC';
+
+    self.services = {};
+
+    return self;
+};
+
+/*
+ * Announces a service on the network.
+ *
+ * The only required parameters are 'service_name' and 'port'.
+ * The parameter 'iface' is optional and can be either something like 'eth0'
+ * or also an address like '192.168.1.7'.
+ */
+avahi.prototype.announce = function (service_name, port, iface) {
+    var self = this;
+
+    if (!port || !service_name) {
+        logger.error('announce(): service_name and port are required parameters');
+        return;
+    }
+
+    var txtRecord = {
+        namespace: self.namespace,
+        name: service_name,
+        uuid: self.client_id
+    };
+
+    var options = {
+        txtRecord: txtRecord,
+        name: service_name + '.' + self.client_id,
+    };
+
+    if (iface) {
+        options.networkInterface = iface;
+    }
+
+    var ann = mdns.createAdvertisement(mdns.tcp(self.namespace), port, options);
+    ann.start();
+
+    var ann = mdns.createAdvertisement(mdns.tcp('http'), port, options);
+    ann.start();
+};

index.js

@@ -5,4 +5,5 @@ exports = module.exports = {
     logger: require('./logger'),
     iobackends: require('./models/iobackends'),
     utils: require('./utils'),
+    avahi: require('./avahi')
 }

package.json

@@ -21,6 +21,7 @@
         "backbone-relational" : "git://github.com/inaes-tic/Backbone-relational.git#pageable-compat",
         "backbone.io"         : "git://github.com/inaes-tic/backbone.io",
         "winston"   : "0.7.x",
+        "mdns2"     : "2.1.3",
         "moment"    : "1.7.x"
     },
     "license": "agplv3",