415 lines
14 KiB
Python
415 lines
14 KiB
Python
import avahi, dbus, dbus.glib, dbus.dbus_bindings, gobject
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import Buddy
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import Service
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import random
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import logging
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from sugar import env
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def _get_local_ip_address(ifname):
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"""Call Linux specific bits to retrieve our own IP address."""
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import socket
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import sys
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import fcntl
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addr = None
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SIOCGIFADDR = 0x8915
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sockfd = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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try:
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ifreq = (ifname + '\0'*32)[:32]
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result = fcntl.ioctl(sockfd.fileno(), SIOCGIFADDR, ifreq)
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addr = socket.inet_ntoa(result[20:24])
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except IOError, exc:
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print "Error getting IP address: %s" % exc
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sockfd.close()
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return addr
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class ServiceAdv(object):
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"""Wrapper class to track services from Avahi."""
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def __init__(self, interface, protocol, name, stype, domain):
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self._interface = interface
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self._protocol = protocol
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if type(name) != type(u""):
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raise ValueError("service advertisement name must be unicode.")
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self._name = name
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if type(stype) != type(u""):
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raise ValueError("service advertisement type must be unicode.")
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self._stype = stype
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if type(domain) != type(u""):
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raise ValueError("service advertisement domain must be unicode.")
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self._domain = domain
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self._service = None
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self._resolved = False
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def interface(self):
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return self._interface
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def protocol(self):
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return self._protocol
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def name(self):
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return self._name
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def stype(self):
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return self._stype
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def domain(self):
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return self._domain
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def service(self):
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return self._service
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def set_service(self, service):
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if not isinstance(service, Service.Service):
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raise ValueError("must be a valid service.")
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self._service = service
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def resolved(self):
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return self._resolved
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def set_resolved(self, resolved):
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self._resolved = resolved
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_PRESENCE_SERVICE = "org.laptop.Presence"
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_PRESENCE_DBUS_INTERFACE = "org.laptop.Presence"
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_PRESENCE_OBJECT_PATH = "/org/laptop/Presence"
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class PresenceServiceDBusHelper(dbus.service.Object):
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def __init__(self, parent, bus_name):
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self._parent = parent
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self._bus_name = bus_name
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dbus.service.Object.__init__(self, bus_name, _PRESENCE_OBJECT_PATH)
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@dbus.service.signal(_PRESENCE_DBUS_INTERFACE,
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signature="o")
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def BuddyAppeared(self, object_path):
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pass
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@dbus.service.signal(_PRESENCE_DBUS_INTERFACE,
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signature="o")
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def BuddyDisappeared(self, object_path):
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pass
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@dbus.service.signal(_PRESENCE_DBUS_INTERFACE,
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signature="o")
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def ServiceAppeared(self, object_path):
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pass
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@dbus.service.signal(_PRESENCE_DBUS_INTERFACE,
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signature="o")
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def ServiceDisappeared(self, object_path):
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pass
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@dbus.service.signal(_PRESENCE_DBUS_INTERFACE,
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signature="o")
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def ActivityAppeared(self, object_path):
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pass
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@dbus.service.signal(_PRESENCE_DBUS_INTERFACE,
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signature="o")
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def ActivityDisappeared(self, object_path):
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pass
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class PresenceService(object):
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def __init__(self):
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# interface -> IP address: interfaces we've gotten events on so far
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self._local_addrs = {}
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self._next_object_id = 0
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# Our owner object
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self._owner = None
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self._buddies = {} # nick -> Buddy
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self._services = {} # (name, type) -> Service
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self._activities = {} # activity id -> Activity
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# Keep track of stuff we're already browsing with ZC
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self._service_type_browsers = {}
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self._service_browsers = {}
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self._resolve_queue = [] # Track resolve requests
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# Resolved service list
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self._service_advs = []
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# Service types we care about resolving
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self._registered_service_types = []
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# Set up the dbus service we provide
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session_bus = dbus.SessionBus()
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self._bus_name = dbus.service.BusName(_PRESENCE_SERVICE, bus=session_bus)
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self._dbus_helper = PresenceServiceDBusHelper(self, self._bus_name)
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# Connect to Avahi for mDNS stuff
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self._system_bus = dbus.SystemBus()
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self._mdns_service = dbus.Interface(self._system_bus.get_object(avahi.DBUS_NAME,
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avahi.DBUS_PATH_SERVER), avahi.DBUS_INTERFACE_SERVER)
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# Always browse .local
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self._new_domain_cb(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC, "local")
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# Connect to Avahi and start looking for stuff
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domain_browser = self._mdns_service.DomainBrowserNew(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC,
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"", avahi.DOMAIN_BROWSER_BROWSE, dbus.UInt32(0))
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db = dbus.Interface(self._system_bus.get_object(avahi.DBUS_NAME, domain_browser), avahi.DBUS_INTERFACE_DOMAIN_BROWSER)
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db.connect_to_signal('ItemNew', self._new_domain_cb_glue)
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def _get_next_object_id(self):
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"""Increment and return the object ID counter."""
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self._next_object_id = self._next_object_id + 1
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return self._next_object_id
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def _find_service_adv(self, interface=None, protocol=None, name=None, stype=None, domain=None):
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"""Search a list of service advertisements for ones matching certain criteria."""
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adv_list = []
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for adv in self._service_advs:
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if interface and adv.interface() != interface:
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continue
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if protocol and adv.protocol() != protocol:
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continue
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if name and adv.name() != name:
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continue
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if stype and adv.stype() != stype:
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continue
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if domain and adv.domain() != domain:
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continue
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adv_list.append(adv)
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return adv_list
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def _handle_new_service_for_buddy(self, service):
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"""Deal with a new discovered service object."""
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# Once a service is resolved, we match it up to an existing buddy,
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# or create a new Buddy if this is the first service known about the buddy
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buddy_was_valid = False
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name = service.get_name()
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buddy = None
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try:
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buddy = self._buddies[name]
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buddy_was_valid = buddy.is_valid()
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service_added = buddy.add_service(service)
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if service_added:
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self._dbus_helper.ServiceAppeared(service.object_path())
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except KeyError:
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# Should this service mark the owner?
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owner_nick = env.get_nick_name()
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publisher_addr = service.get_publisher_address()
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objid = self._get_next_object_id()
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if name == owner_nick and publisher_addr in self._local_addrs.values():
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buddy = Buddy.Owner(self._bus_name, objid, service)
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self._owner = buddy
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logging.debug("Owner is '%s'." % name)
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else:
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buddy = Buddy.Buddy(self._bus_name, objid, service)
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self._buddies[name] = buddy
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self._dbus_helper.ServiceAppeared(service.object_path())
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if not buddy_was_valid and buddy.is_valid():
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self._dbus_helper.BuddyAppeared(buddy.object_path())
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return buddy
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def _handle_new_activity_service(self, service):
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# If the serivce is an activity service, merge it into our activities list
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actid = service.get_activity_id()
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if not actid:
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return
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activity = None
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if not self._activities.has_key(actid):
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objid = self._get_next_object_id()
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activity = Activity.Activity(self._bus_name, objid, service)
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self._activities[actid] = activity
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self._dbus_helper.ActivityAppeared(activity.object_path())
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else:
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activity = self._activities[actid]
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if activity:
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activity.add_service(service)
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def _handle_remove_activity_service(self, service):
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actid = service.get_activity_id()
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if not actid:
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return
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if not self._activities.has_key(actid):
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return
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activity = self._activities[actid]
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activity.remove_service(service)
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if len(activity.get_services()) == 0:
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# Kill the activity
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self._dbus_helper.ActivityDisappeared(activity.object_path())
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del self._activities[actid]
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def _resolve_service_reply_cb(self, interface, protocol, full_name, stype, domain, host, aprotocol, address, port, txt, flags):
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"""When the service discovery finally gets here, we've got enough information about the
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service to assign it to a buddy."""
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logging.debug("resolved service '%s' type '%s' domain '%s' to %s:%s" % (full_name, stype, domain, address, port))
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# If this service was previously unresolved, remove it from the
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# unresolved list
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adv_list = self._find_service_adv(interface=interface, protocol=protocol,
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name=full_name, stype=stype, domain=domain)
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if not adv_list:
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return False
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adv = adv_list[0]
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adv.set_resolved(True)
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if adv in self._resolve_queue:
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self._resolve_queue.remove(adv)
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# Update the service now that it's been resolved
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objid = self._get_next_object_id()
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service = Service.Service(self._bus_name, objid, name=full_name,
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stype=stype, domain=domain, address=address, port=port,
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properties=txt)
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adv.set_service(service)
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# Merge the service into our buddy and activity lists, if needed
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buddy = self._handle_new_service_for_buddy(service)
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if buddy and service.get_activity_id():
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self._handle_new_activity_service(service)
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return False
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def _resolve_service_reply_cb_glue(self, interface, protocol, name, stype, domain, host, aprotocol, address, port, txt, flags):
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gobject.idle_add(self._resolve_service_reply_cb, interface, protocol,
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name, stype, domain, host, aprotocol, address, port, txt, flags)
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def _resolve_service(self, adv):
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"""Resolve and lookup a ZeroConf service to obtain its address and TXT records."""
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# Ask avahi to resolve this particular service
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logging.debug('resolving service %s %s' % (adv.name(), adv.stype()))
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self._mdns_service.ResolveService(int(adv.interface()), int(adv.protocol()), adv.name(),
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adv.stype(), adv.domain(), avahi.PROTO_UNSPEC, dbus.UInt32(0),
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reply_handler=self._resolve_service_reply_cb_glue,
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error_handler=self._resolve_service_error_handler)
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return False
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def _service_appeared_cb(self, interface, protocol, full_name, stype, domain, flags):
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logging.debug("found service '%s' (%d) of type '%s' in domain '%s' on %i.%i." % (full_name, flags, stype, domain, interface, protocol))
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# Add the service to our unresolved services list
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adv_list = self._find_service_adv(interface=interface, protocol=protocol,
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name=full_name, stype=stype, domain=domain)
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adv = None
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if not adv_list:
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adv = ServiceAdv(interface=interface, protocol=protocol, name=full_name,
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stype=stype, domain=domain)
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self._service_advs.append(adv)
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else:
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adv = adv_list[0]
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# Find out the IP address of this interface, if we haven't already
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if interface not in self._local_addrs.keys():
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ifname = self._mdns_service.GetNetworkInterfaceNameByIndex(interface)
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if ifname:
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addr = _get_local_ip_address(ifname)
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if addr:
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self._local_addrs[interface] = addr
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# Decompose service name if we can
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(actid, buddy_name) = Service._decompose_service_name(full_name)
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# If we care about the service right now, resolve it
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resolve = False
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if actid is not None or stype in self._registered_service_types:
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resolve = True
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if resolve and not adv in self._resolve_queue:
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self._resolve_queue.append(adv)
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gobject.idle_add(self._resolve_service, adv)
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else:
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logging.debug("Do not resolve service '%s' of type '%s', we don't care about it." % (full_name, stype))
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return False
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def _service_appeared_cb_glue(self, interface, protocol, name, stype, domain, flags):
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gobject.idle_add(self._service_appeared_cb, interface, protocol, name, stype, domain, flags)
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def _service_disappeared_cb(self, interface, protocol, full_name, stype, domain, flags):
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logging.debug("service '%s' of type '%s' in domain '%s' on %i.%i disappeared." % (full_name, stype, domain, interface, protocol))
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# If it's an unresolved service, remove it from our unresolved list
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adv_list = self._find_service_adv(interface=interface, protocol=protocol,
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name=full_name, stype=stype, domain=domain)
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if not adv_list:
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return False
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# Get the service object; if none, we have nothing left to do
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adv = adv_list[0]
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if adv in self._resolve_queue:
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self._resolve_queue.remove(adv)
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service = adv.service()
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if not service:
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return False
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# Decompose service name if we can
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(actid, buddy_name) = Service._decompose_service_name(full_name)
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# Remove the service from the buddy
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try:
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buddy = self._buddies[buddy_name]
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except KeyError:
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pass
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else:
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buddy.remove_service(service)
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self._dbus_helper.ServiceDisappeared(service.object_path())
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self._handle_remove_activity_service(service)
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if not buddy.is_valid():
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self._dbus_helper.BuddyDisappeared(buddy.object_path())
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del self._buddies[buddy_name]
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return False
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def _service_disappeared_cb_glue(self, interface, protocol, name, stype, domain, flags):
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gobject.idle_add(self._service_disappeared_cb, interface, protocol, name, stype, domain, flags)
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def _new_service_type_cb(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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# Start browsing for all services of this type in this domain
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s_browser = self._mdns_service.ServiceBrowserNew(interface, protocol, stype, domain, dbus.UInt32(0))
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browser_obj = dbus.Interface(self._system_bus.get_object(avahi.DBUS_NAME, s_browser),
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avahi.DBUS_INTERFACE_SERVICE_BROWSER)
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logging.debug("now browsing for services of type '%s' in domain '%s' on %i.%i ..." % (stype, domain, interface, protocol))
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browser_obj.connect_to_signal('ItemNew', self._service_appeared_cb_glue)
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browser_obj.connect_to_signal('ItemRemove', self._service_disappeared_cb_glue)
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self._service_browsers[(interface, protocol, stype, domain)] = browser_obj
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return False
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def _new_service_type_cb_glue(self, interface, protocol, stype, domain, flags):
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gobject.idle_add(self._new_service_type_cb, interface, protocol, stype, domain, flags)
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def _new_domain_cb(self, interface, protocol, domain, flags=0):
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"""Callback from Avahi when a new domain has been found. Start
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browsing the new domain."""
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# Only use .local for now...
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if domain != "local":
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return
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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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# Start browsing this domain for the services its members offer
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try:
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st_browser = self._mdns_service.ServiceTypeBrowserNew(interface, protocol, domain, dbus.UInt32(0))
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browser_obj = dbus.Interface(self._system_bus.get_object(avahi.DBUS_NAME, st_browser),
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avahi.DBUS_INTERFACE_SERVICE_TYPE_BROWSER)
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except dbus.DBusException, exc:
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logging.error("got exception %s while attempting to browse domain %s on %i.%i" % (domain, interface, protocol))
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str_exc = str(exc)
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if str_exc.find("The name org.freedesktop.Avahi was not provided by any .service files") >= 0:
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raise Exception("Avahi does not appear to be running. '%s'" % str_exc)
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else:
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raise exc
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logging.debug("now browsing domain '%s' on %i.%i ..." % (domain, interface, protocol))
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browser_obj.connect_to_signal('ItemNew', self._new_service_type_cb_glue)
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self._service_type_browsers[(interface, protocol, domain)] = browser_obj
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return False
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def _new_domain_cb_glue(self, interface, protocol, domain, flags=0):
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gobject.idle_add(self._new_domain_cb, interface, protocol, domain, flags)
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def main():
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import gtk
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ps = PresenceService()
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gtk.main()
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if __name__ == "__main__":
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main()
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