merge

1 files changed, 106 insertions, 0 deletions

diff --git a/sugar/p2p/presence.py b/sugar/p2p/presence.py
new file mode 100644
index 0000000..9cb297e
--- /dev/null
+++ b/sugar/p2p/presence.py
@@ -0,0 +1,106 @@
+# -*- tab-width: 4; indent-tabs-mode: t -*- 
+
+import avahi, dbus, dbus.glib, dbus.dbus_bindings
+
+ACTION_SERVICE_NEW = 'new'
+ACTION_SERVICE_REMOVED = 'removed'
+
+class PresenceDiscovery(object):
+	def __init__(self):
+		self.bus = dbus.SystemBus()
+		self.server = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER), avahi.DBUS_INTERFACE_SERVER)
+		self._service_browsers = {}
+		self._service_type_browsers = {}
+		self._service_listeners = []
+
+	def add_service_listener(self, listener):
+		self._service_listeners.append(listener)
+
+	def start(self):
+		# Always browse .local
+		self.browse_domain(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC, "local")
+		db = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME, self.server.DomainBrowserNew(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC, "", avahi.DOMAIN_BROWSER_BROWSE, dbus.UInt32(0))), avahi.DBUS_INTERFACE_DOMAIN_BROWSER)
+		db.connect_to_signal('ItemNew', self.new_domain)	
+
+	def _error_handler(self, err):
+		print "Error resolving: %s" % err
+
+	def resolve_service(self, interface, protocol, name, stype, domain, reply_handler, error_handler=None):
+		if not error_handler:
+			error_handler = self._error_handler
+		self.server.ResolveService(int(interface), int(protocol), name, stype, domain, avahi.PROTO_UNSPEC, dbus.UInt32(0), reply_handler=reply_handler, error_handler=error_handler)
+
+	def new_service(self, interface, protocol, name, stype, domain, flags):
+#		print "Found service '%s' (%d) of type '%s' in domain '%s' on %i.%i." % (name, flags, stype, domain, interface, protocol)
+		for listener in self._service_listeners:
+			listener(ACTION_SERVICE_NEW, interface, protocol, name, stype, domain, flags)
+
+	def remove_service(self, interface, protocol, name, stype, domain, flags):
+#		print "Service '%s' of type '%s' in domain '%s' on %i.%i disappeared." % (name, stype, domain, interface, protocol)
+		for listener in self._service_listeners:
+			listener(ACTION_SERVICE_REMOVED, interface, protocol, name, stype, domain, flags)
+ 
+	def new_service_type(self, interface, protocol, stype, domain, flags):
+		# Are we already browsing this domain for this type? 
+		if self._service_browsers.has_key((interface, protocol, stype, domain)):
+			return
+
+#		print "Browsing for services of type '%s' in domain '%s' on %i.%i ..." % (stype, domain, interface, protocol)
+
+		b = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME, self.server.ServiceBrowserNew(interface, protocol, stype, domain, dbus.UInt32(0))),  avahi.DBUS_INTERFACE_SERVICE_BROWSER)
+		b.connect_to_signal('ItemNew', self.new_service)
+		b.connect_to_signal('ItemRemove', self.remove_service)
+
+		self._service_browsers[(interface, protocol, stype, domain)] = b
+
+	def browse_domain(self, interface, protocol, domain):
+		# Are we already browsing this domain?
+		if self._service_type_browsers.has_key((interface, protocol, domain)):
+			return
+
+#		print "Browsing domain '%s' on %i.%i ..." % (domain, interface, protocol)
+    
+		try:
+			b = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME, self.server.ServiceTypeBrowserNew(interface, protocol, domain, dbus.UInt32(0))),  avahi.DBUS_INTERFACE_SERVICE_TYPE_BROWSER)
+		except dbus.DBusException, exc:
+			str_exc = str(exc)
+			if str_exc.find("The name org.freedesktop.Avahi was not provided by any .service files") >= 0:
+				raise Exception("Avahi does not appear to be running.  '%s'" % str_exc)
+			else:
+				raise exc
+		b.connect_to_signal('ItemNew', self.new_service_type)
+
+		self._service_type_browsers[(interface, protocol, domain)] = b
+
+	def new_domain(self, interface, protocol, domain, flags):
+		if domain != "local":
+			return
+		self.browse_domain(interface, protocol, domain)
+
+
+class PresenceAnnounce(object):
+	def __init__(self):
+		self.bus = dbus.SystemBus()
+		self.server = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER), avahi.DBUS_INTERFACE_SERVER)
+		self._hostname = None
+
+	def register_service(self, rs_name, rs_port, rs_service, **kwargs):
+		g = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME, self.server.EntryGroupNew()), avahi.DBUS_INTERFACE_ENTRY_GROUP)
+		if rs_name is None:
+			if self._hostname is None:
+				self._hostname = "%s:%s" % (self.server.GetHostName(), rs_port)
+				rs_name = self._hostname
+
+		info = ["%s=%s" % (k, v) for k, v in kwargs.items()]
+		try:
+			g.AddService(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC, 0, rs_name, rs_service,
+					"", "", # domain, host (let the system figure it out)
+					dbus.UInt16(rs_port), info,)
+			g.Commit()
+		except dbus.dbus_bindings.DBusException, exc:
+			# FIXME: ignore local name collisions, since that means
+			# the zeroconf service is already registered.  Ideally we
+			# should un-register it an re-register with the correct info
+			if str(exc) == "Local name collision":
+				pass
+		return g