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# -*- tab-width: 4; indent-tabs-mode: t -*-
import avahi, dbus, dbus.glib
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)
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)
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()]
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()
return g
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