678 lines
24 KiB
Python
678 lines
24 KiB
Python
import avahi, dbus, dbus.glib, gobject
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import Buddy
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import Service
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import Activity
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import random
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import logging
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from sugar import env
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from sugar import util
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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 NotFoundError(Exception):
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pass
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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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@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
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in_signature="", out_signature="ao")
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def getServices(self):
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services = self._parent.get_services()
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ret = []
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for serv in services:
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ret.append(serv.object_path())
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return ret
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@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
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in_signature="s", out_signature="ao")
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def getServicesOfType(self, stype):
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services = self._parent.get_services_of_type(stype)
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ret = []
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for serv in services:
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ret.append(serv.object_path())
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return ret
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@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
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in_signature="", out_signature="ao")
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def getActivities(self):
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activities = self._parent.get_activities()
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ret = []
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for act in activities:
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ret.append(act.object_path())
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return ret
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@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
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in_signature="s", out_signature="o")
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def getActivity(self, actid):
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act = self._parent.get_activity(actid)
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if not act:
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raise NotFoundError("Not found")
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return act.object_path()
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@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
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in_signature="", out_signature="ao")
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def getBuddies(self):
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buddies = self._parent.get_buddies()
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ret = []
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for buddy in buddies:
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ret.append(buddy.object_path())
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return ret
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@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
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in_signature="s", out_signature="o")
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def getBuddyByName(self, name):
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buddy = self._parent.get_buddy_by_name(name)
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if not buddy:
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raise NotFoundError("Not found")
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return buddy.object_path()
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@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
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in_signature="s", out_signature="o")
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def getBuddyByAddress(self, addr):
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buddy = self._parent.get_buddy_by_address(addr)
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if not buddy:
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raise NotFoundError("Not found")
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return buddy.object_path()
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@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
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in_signature="", out_signature="o")
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def getOwner(self):
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owner = self._parent.get_owner()
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if not owner:
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raise NotFoundError("Not found")
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return owner.object_path()
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@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
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in_signature="os", out_signature="o")
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def joinActivity(self, activity_op, stype):
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found_activity = None
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acts = self._parent.get_activities()
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for act in acts:
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if act.object_path() == activity_op:
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found_activity = act
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break
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if not found_activity:
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raise NotFoundError("The activity %s was not found." % activity_op)
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return self._parent.join_activity(found_activity, stype)
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@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
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in_signature="ssa{ss}sis", out_signature="o")
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def shareActivity(self, activity_id, stype, properties, address, port, domain):
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if not len(address):
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address = None
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service = self._parent.share_activity(activity_id, stype, properties, address,
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port, domain)
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return service.object_path()
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@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
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in_signature="ssa{ss}sis", out_signature="o")
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def registerService(self, name, stype, properties, address, port, domain):
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if not len(address):
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address = None
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service = self._parent.register_service(name, stype, properties, address,
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port, domain)
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return service.object_path()
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@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
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in_signature="s", out_signature="")
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def registerServiceType(self, stype):
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self._parent.register_service_type(stype)
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@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
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in_signature="s", out_signature="")
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def unregisterServiceType(self, stype):
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self._parent.unregister_service_type(stype)
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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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self._session_bus = dbus.SessionBus()
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self._bus_name = dbus.service.BusName(_PRESENCE_SERVICE, bus=self._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 get_services(self):
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return self._services.values()
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def get_services_of_type(self, stype):
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ret = []
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for serv in self._services.values():
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if serv.get_type() == stype:
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ret.append(serv)
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return ret
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def get_activities(self):
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return self._activities.values()
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def get_activity(self, actid):
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if self._activities.has_key(actid):
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return self._activities[actid]
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return None
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def get_buddies(self):
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return self._buddies.values()
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def get_buddy_by_name(self, name):
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if self._buddies.has_key(name):
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return self._buddies[name]
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return None
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def get_buddy_by_address(self, address):
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for buddy in self._buddies.values():
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if buddy.get_address() == address:
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return buddy
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return None
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def get_owner(self):
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return self._owner
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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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source_addr = service.get_source_address()
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objid = self._get_next_object_id()
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if name == owner_nick and source_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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# See if we know about this service already
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key = (full_name, stype)
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if not self._services.has_key(key):
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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, source_address=address)
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self._services[key] = service
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else:
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# Already tracking this service; likely we were the one that shared it
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# in the first place, and therefore the source address would have been
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# set yet
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service = self._services[key]
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if not service.get_source_address():
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service.set_source_address(address)
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if not service.get_address():
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service.set_address(address)
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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_error_handler(self, err):
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logging.error("error resolving service: %s" % err)
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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,
|
|
name=full_name, stype=stype, domain=domain)
|
|
if not adv_list:
|
|
return False
|
|
|
|
# Get the service object; if none, we have nothing left to do
|
|
adv = adv_list[0]
|
|
if adv in self._resolve_queue:
|
|
self._resolve_queue.remove(adv)
|
|
service = adv.service()
|
|
if not service:
|
|
return False
|
|
|
|
# Decompose service name if we can
|
|
(actid, buddy_name) = Service.decompose_service_name(full_name)
|
|
|
|
# Remove the service from the buddy
|
|
try:
|
|
buddy = self._buddies[buddy_name]
|
|
except KeyError:
|
|
pass
|
|
else:
|
|
buddy.remove_service(service)
|
|
self._dbus_helper.ServiceDisappeared(service.object_path())
|
|
self._handle_remove_activity_service(service)
|
|
if not buddy.is_valid():
|
|
self._dbus_helper.BuddyDisappeared(buddy.object_path())
|
|
del self._buddies[buddy_name]
|
|
key = (service.get_full_name(), service.get_type())
|
|
del self._services[key]
|
|
return False
|
|
|
|
def _service_disappeared_cb_glue(self, interface, protocol, name, stype, domain, flags):
|
|
gobject.idle_add(self._service_disappeared_cb, interface, protocol, name, stype, domain, flags)
|
|
|
|
def _new_service_type_cb(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
|
|
|
|
# Start browsing for all services of this type in this domain
|
|
s_browser = self._mdns_service.ServiceBrowserNew(interface, protocol, stype, domain, dbus.UInt32(0))
|
|
browser_obj = dbus.Interface(self._system_bus.get_object(avahi.DBUS_NAME, s_browser),
|
|
avahi.DBUS_INTERFACE_SERVICE_BROWSER)
|
|
logging.debug("now browsing for services of type '%s' in domain '%s' on %i.%i ..." % (stype, domain, interface, protocol))
|
|
browser_obj.connect_to_signal('ItemNew', self._service_appeared_cb_glue)
|
|
browser_obj.connect_to_signal('ItemRemove', self._service_disappeared_cb_glue)
|
|
|
|
self._service_browsers[(interface, protocol, stype, domain)] = browser_obj
|
|
return False
|
|
|
|
def _new_service_type_cb_glue(self, interface, protocol, stype, domain, flags):
|
|
gobject.idle_add(self._new_service_type_cb, interface, protocol, stype, domain, flags)
|
|
|
|
def _new_domain_cb(self, interface, protocol, domain, flags=0):
|
|
"""Callback from Avahi when a new domain has been found. Start
|
|
browsing the new domain."""
|
|
# Only use .local for now...
|
|
if domain != "local":
|
|
return
|
|
|
|
# Are we already browsing this domain?
|
|
if self._service_type_browsers.has_key((interface, protocol, domain)):
|
|
return
|
|
|
|
# Start browsing this domain for the services its members offer
|
|
try:
|
|
st_browser = self._mdns_service.ServiceTypeBrowserNew(interface, protocol, domain, dbus.UInt32(0))
|
|
browser_obj = dbus.Interface(self._system_bus.get_object(avahi.DBUS_NAME, st_browser),
|
|
avahi.DBUS_INTERFACE_SERVICE_TYPE_BROWSER)
|
|
except dbus.DBusException, exc:
|
|
logging.error("got exception %s while attempting to browse domain %s on %i.%i" % (domain, interface, protocol))
|
|
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
|
|
logging.debug("now browsing domain '%s' on %i.%i ..." % (domain, interface, protocol))
|
|
browser_obj.connect_to_signal('ItemNew', self._new_service_type_cb_glue)
|
|
self._service_type_browsers[(interface, protocol, domain)] = browser_obj
|
|
return False
|
|
|
|
def _new_domain_cb_glue(self, interface, protocol, domain, flags=0):
|
|
gobject.idle_add(self._new_domain_cb, interface, protocol, domain, flags)
|
|
|
|
def join_activity(self, activity, stype):
|
|
services = activity.get_services_of_type(stype)
|
|
if not len(services):
|
|
raise NotFoundError("The service type %s was not present within the activity %s" % (stype, activity.object_path()))
|
|
act_service = services[0]
|
|
return self._share_activity(activity.get_id(), stype, act_service.get_properties(),
|
|
act_service.get_address(), act_service.get_port(), act_service.get_domain())
|
|
|
|
def share_activity(self, activity_id, stype, properties=None, address=None, port=-1, domain=u"local"):
|
|
"""Convenience function to share an activity with other buddies."""
|
|
if not util.validate_activity_id(activity_id):
|
|
raise ValueError("invalid activity id")
|
|
owner_nick = self._owner.get_name()
|
|
real_name = Service.compose_service_name(owner_nick, activity_id)
|
|
if address and type(address) != type(u""):
|
|
raise ValueError("address must be a unicode string.")
|
|
if address == None and stype.endswith('_udp'):
|
|
# Use random currently unassigned multicast address
|
|
address = u"232.%d.%d.%d" % (random.randint(0, 254), random.randint(1, 254),
|
|
random.randint(1, 254))
|
|
properties['address'] = address
|
|
properties['port'] = port
|
|
if port and port != -1 and (type(port) != type(1) or port <= 1024 or port >= 65535):
|
|
raise ValueError("port must be a number between 1024 and 65535")
|
|
|
|
logging.debug('Share activity %s, type %s, address %s, port %d, properties %s' % (activity_id, stype, address, port, properties))
|
|
return self.register_service(real_name, stype, properties, address, port, domain)
|
|
|
|
def register_service(self, name, stype, properties={}, address=None, port=-1, domain=u"local"):
|
|
"""Register a new service, advertising it to other Buddies on the network."""
|
|
(actid, person_name) = Service.decompose_service_name(name)
|
|
if self.get_owner() and person_name != self.get_owner().get_name():
|
|
raise RuntimeError("Tried to register a service that didn't have Owner nick as the service name!")
|
|
if not domain or not len(domain):
|
|
domain = u"local"
|
|
if not port or port == -1:
|
|
port = random.randint(4000, 65000)
|
|
|
|
try:
|
|
obj = self._system_bus.get_object(avahi.DBUS_NAME, self._mdns_service.EntryGroupNew())
|
|
group = dbus.Interface(obj, avahi.DBUS_INTERFACE_ENTRY_GROUP)
|
|
|
|
# Add properties; ensure they are converted to ByteArray types
|
|
# because python sometimes can't figure that out
|
|
info = dbus.Array([])
|
|
for k, v in properties.items():
|
|
info.append(dbus.types.ByteArray("%s=%s" % (k, v)))
|
|
|
|
objid = self._get_next_object_id()
|
|
service = Service.Service(self._bus_name, objid, name=name,
|
|
stype=stype, domain=domain, address=address, port=port,
|
|
properties=properties, source_address=None)
|
|
self._services[(name, stype)] = service
|
|
port = service.get_port()
|
|
|
|
logging.debug("PS: Will register service with name='%s', stype='%s'," \
|
|
" domain='%s', address='%s', port=%d, info='%s'" % (name, stype, domain, address, port, info))
|
|
group.AddService(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC, 0, dbus.String(name),
|
|
dbus.String(stype), dbus.String(domain), dbus.String(""), # let Avahi figure the 'host' out
|
|
dbus.UInt16(port), info)
|
|
group.Commit()
|
|
except dbus.exceptions.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
|
|
self.register_service_type(stype)
|
|
return service
|
|
|
|
def register_service_type(self, stype):
|
|
"""Requests that the Presence service look for and recognize
|
|
a certain mDNS service types."""
|
|
if type(stype) != type(u""):
|
|
raise ValueError("service type must be a unicode string.")
|
|
if stype in self._registered_service_types:
|
|
return
|
|
self._registered_service_types.append(stype)
|
|
|
|
# Find unresolved services that match the service type
|
|
# we're now interested in, and resolve them
|
|
resolv_list = []
|
|
|
|
# Find services of this type
|
|
resolv_list = self._find_service_adv(stype=stype)
|
|
# Request resolution for them if they aren't in-process already
|
|
for adv in resolv_list:
|
|
if adv not in self._resolve_queue:
|
|
self._resolve_queue.append(adv)
|
|
gobject.idle_add(self._resolve_service, adv)
|
|
|
|
def unregister_service_type(self, stype):
|
|
"""Stop tracking a certain mDNS service."""
|
|
if type(stype) != type(u""):
|
|
raise ValueError("service type must be a unicode string.")
|
|
if stype in self._registered_service_types:
|
|
self._registered_service_types.remove(stype)
|
|
|
|
|
|
|
|
def main():
|
|
loop = gobject.MainLoop()
|
|
ps = PresenceService()
|
|
loop.run()
|
|
|
|
if __name__ == "__main__":
|
|
main()
|