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93 lines
4.1 KiB
Python
93 lines
4.1 KiB
Python
# -*- tab-width: 4; indent-tabs-mode: t -*-
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import avahi, dbus, dbus.glib
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ACTION_SERVICE_NEW = 'new'
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ACTION_SERVICE_REMOVED = 'removed'
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class PresenceDiscovery(object):
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def __init__(self):
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self.bus = dbus.SystemBus()
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self.server = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER), avahi.DBUS_INTERFACE_SERVER)
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self._service_browsers = {}
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self._service_type_browsers = {}
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self._service_listeners = []
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def add_service_listener(self, listener):
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self._service_listeners.append(listener)
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def start(self):
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# Always browse .local
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self.browse_domain(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC, "local")
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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)
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db.connect_to_signal('ItemNew', self.new_domain)
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def _error_handler(self, err):
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print "Error resolving: %s" % err
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def resolve_service(self, interface, protocol, name, stype, domain, reply_handler, error_handler=None):
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if not error_handler:
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error_handler = self._error_handler
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self.server.ResolveService(int(interface), int(protocol), name, stype, domain, avahi.PROTO_UNSPEC, dbus.UInt32(0), reply_handler=reply_handler, error_handler=error_handler)
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def new_service(self, interface, protocol, name, stype, domain, flags):
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# print "Found service '%s' (%d) of type '%s' in domain '%s' on %i.%i." % (name, flags, stype, domain, interface, protocol)
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for listener in self._service_listeners:
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listener(ACTION_SERVICE_NEW, interface, protocol, name, stype, domain, flags)
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def remove_service(self, interface, protocol, name, stype, domain, flags):
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# print "Service '%s' of type '%s' in domain '%s' on %i.%i disappeared." % (name, stype, domain, interface, protocol)
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for listener in self._service_listeners:
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listener(ACTION_SERVICE_REMOVED, interface, protocol, name, stype, domain, flags)
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def new_service_type(self, interface, protocol, stype, domain, flags):
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# Are we already browsing this domain for this type?
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if self._service_browsers.has_key((interface, protocol, stype, domain)):
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return
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# print "Browsing for services of type '%s' in domain '%s' on %i.%i ..." % (stype, domain, interface, protocol)
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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)
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b.connect_to_signal('ItemNew', self.new_service)
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b.connect_to_signal('ItemRemove', self.remove_service)
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self._service_browsers[(interface, protocol, stype, domain)] = b
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def browse_domain(self, interface, protocol, domain):
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# Are we already browsing this domain?
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if self._service_type_browsers.has_key((interface, protocol, domain)):
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return
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# print "Browsing domain '%s' on %i.%i ..." % (domain, interface, protocol)
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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)
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b.connect_to_signal('ItemNew', self.new_service_type)
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self._service_type_browsers[(interface, protocol, domain)] = b
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def new_domain(self,interface, protocol, domain, flags):
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if domain != "local":
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return
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self.browse_domain(interface, protocol, domain)
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class PresenceAnnounce(object):
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def __init__(self):
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self.bus = dbus.SystemBus()
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self.server = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER), avahi.DBUS_INTERFACE_SERVER)
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self._hostname = None
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def register_service(self, rs_name, rs_port, rs_service, **kwargs):
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g = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME, self.server.EntryGroupNew()), avahi.DBUS_INTERFACE_ENTRY_GROUP)
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if rs_name is None:
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if self._hostname is None:
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self._hostname = "%s:%s" % (self.server.GetHostName(), rs_port)
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rs_name = self._hostname
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info = ["%s=%s" % (k,v) for k,v in kwargs.items()]
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g.AddService(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC, 0, rs_name, rs_service,
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"", "", # domain, host (let the system figure it out)
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dbus.UInt16(rs_port), info,)
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g.Commit()
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return g
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