sugar-toolkit-gtk3/services/presence/Service.py

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import avahi
import sys, os
sys.path.insert(0, os.path.abspath("../../"))
from sugar import util
import dbus, dbus.service
import random
import logging
import gobject
def compose_service_name(name, activity_id):
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if type(name) == type(""):
name = unicode(name)
if not name:
raise ValueError("name must be a valid string.")
if not activity_id:
return name
if type(name) != type(u""):
raise ValueError("name must be in unicode.")
composed = "%s [%s]" % (name, activity_id)
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return composed
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def decompose_service_name(name):
"""Break a service name into the name and activity ID, if we can."""
if type(name) != type(u""):
raise ValueError("name must be a valid unicode string.")
name_len = len(name)
if name_len < util.ACTIVITY_ID_LEN + 5:
return (None, name)
# check for activity id end marker
if name[name_len - 1] != "]":
return (None, name)
start = name_len - 1 - util.ACTIVITY_ID_LEN
end = name_len - 1
# check for activity id start marker
if name[start - 1] != "[" or name[start - 2] != " ":
return (None, name)
activity_id = name[start:end]
if not util.validate_activity_id(activity_id):
return (None, name)
return (activity_id, name[:start - 2])
def _one_dict_differs(dict1, dict2):
diff_keys = []
for key, value in dict1.items():
if not dict2.has_key(key) or dict2[key] != value:
diff_keys.append(key)
return diff_keys
def _dicts_differ(dict1, dict2):
diff_keys = []
diff1 = _one_dict_differs(dict1, dict2)
diff2 = _one_dict_differs(dict2, dict1)
for key in diff2:
if key not in diff1:
diff_keys.append(key)
diff_keys += diff1
return diff_keys
def _convert_properties_to_dbus_byte_array(props):
# Ensure properties are converted to ByteArray types
# because python sometimes can't figure that out
info = dbus.Array([], signature="aay")
for k, v in props.items():
info.append(dbus.types.ByteArray("%s=%s" % (k, v)))
return info
_ACTIVITY_ID_TAG = "ActivityID"
SERVICE_DBUS_INTERFACE = "org.laptop.Presence.Service"
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SERVICE_DBUS_OBJECT_PATH = "/org/laptop/Presence/Services/"
class ServiceDBusHelper(dbus.service.Object):
"""Handle dbus requests and signals for Service objects"""
def __init__(self, parent, bus_name, object_path):
self._parent = parent
self._bus_name = bus_name
self._object_path = object_path
dbus.service.Object.__init__(self, bus_name, self._object_path)
@dbus.service.signal(SERVICE_DBUS_INTERFACE,
signature="as")
def PublishedValueChanged(self, keylist):
pass
@dbus.service.method(SERVICE_DBUS_INTERFACE,
in_signature="", out_signature="a{sv}")
def getProperties(self):
"""Return service properties."""
pary = {}
pary['name'] = self._parent.get_name()
pary['type'] = self._parent.get_type()
pary['domain'] = self._parent.get_domain()
actid = self._parent.get_activity_id()
if actid:
pary['activityId'] = actid
port = self._parent.get_port()
if port:
pary['port'] = self._parent.get_port()
addr = self._parent.get_address()
if addr:
pary['address'] = addr
source_addr = self._parent.get_source_address()
if source_addr:
pary['sourceAddress'] = source_addr
return pary
@dbus.service.method(SERVICE_DBUS_INTERFACE,
in_signature="s")
def getPublishedValue(self, key):
"""Return the value belonging to the requested key from the
service's TXT records."""
val = self._parent.get_one_property(key)
if not val:
raise KeyError("Value was not found.")
return val
@dbus.service.method(SERVICE_DBUS_INTERFACE,
in_signature="", out_signature="a{sv}")
def getPublishedValues(self):
pary = {}
props = self._parent.get_properties()
for key, value in props.items():
pary[key] = str(value)
return dbus.Dictionary(pary)
@dbus.service.method(SERVICE_DBUS_INTERFACE,
sender_keyword="sender")
def setPublishedValue(self, key, value, sender):
self._parent.set_property(key, value, sender)
@dbus.service.method(SERVICE_DBUS_INTERFACE,
in_signature="a{sv}", sender_keyword="sender")
def setPublishedValues(self, values, sender):
if not self._parent.is_local():
raise ValueError("Service was not not registered by requesting process!")
self._parent.set_properties(values, sender)
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class Service(gobject.GObject):
"""Encapsulates information about a specific ZeroConf/mDNS
service as advertised on the network."""
__gsignals__ = {
'property-changed': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT]))
}
def __init__(self, bus_name, object_id, name, stype, domain=u"local",
address=None, port=-1, properties=None, source_address=None,
local_publisher=None):
gobject.GObject.__init__(self)
if not bus_name:
raise ValueError("DBus bus name must be valid")
if not object_id or type(object_id) != type(1):
raise ValueError("object id must be a valid number")
# Validate immutable options
if name and type(name) != type(u""):
raise ValueError("name must be unicode.")
if not name or not len(name):
raise ValueError("must specify a valid service name.")
if stype and type(stype) != type(u""):
raise ValueError("service type must be in unicode.")
if not stype or not len(stype):
raise ValueError("must specify a valid service type.")
if not stype.endswith("._tcp") and not stype.endswith("._udp"):
raise ValueError("must specify a TCP or UDP service type.")
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if type(domain) != type(u""):
raise ValueError("domain must be in unicode.")
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if domain and domain != "local":
raise ValueError("must use the 'local' domain (for now).")
# ID of the D-Bus connection that published this service, if any.
# We only let the local publisher modify the service.
self._local_publisher = local_publisher
self._avahi_entry_group = None
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(actid, real_name) = decompose_service_name(name)
self._name = real_name
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self._full_name = name
self._stype = stype
self._domain = domain
self._port = -1
self.set_port(port)
self._properties = {}
self._dbus_helper = None
self._internal_set_properties(properties)
# Source address is the unicast source IP
self._source_address = None
if source_address is not None:
self.set_source_address(source_address)
# Address is the published address, could be multicast or unicast
self._address = None
if self._properties.has_key('address'):
self.set_address(self._properties['address'])
elif address is not None:
self.set_address(address)
self._properties['address'] = address
# Ensure that an ActivityID tag, if given, matches
# what we expect from the service type
if self._properties.has_key(_ACTIVITY_ID_TAG):
prop_actid = self._properties[_ACTIVITY_ID_TAG]
if (prop_actid and not actid) or (prop_actid != actid):
raise ValueError("ActivityID property specified, but the " \
"service names's activity ID didn't match it: %s," \
" %s" % (prop_actid, actid))
self._activity_id = actid
if actid and not self._properties.has_key(_ACTIVITY_ID_TAG):
self._properties[_ACTIVITY_ID_TAG] = actid
self._owner = None
# register ourselves with dbus
self._object_id = object_id
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self._object_path = SERVICE_DBUS_OBJECT_PATH + str(self._object_id)
self._dbus_helper = ServiceDBusHelper(self, bus_name, self._object_path)
def object_path(self):
return dbus.ObjectPath(self._object_path)
def get_owner(self):
return self._owner
def set_owner(self, owner):
if self._owner is not None:
raise RuntimeError("Can only set a service's owner once")
self._owner = owner
def is_local(self):
if self._local_publisher is not None:
return True
return False
def get_name(self):
"""Return the service's name, usually that of the
buddy who provides it."""
return self._name
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def get_full_name(self):
return self._full_name
def get_one_property(self, key):
"""Return one property of the service, or None
if the property was not found. Cannot distinguish
between lack of a property, and a property value that
actually is None."""
if key in self._properties.keys():
return self._properties[key]
return None
def get_properties(self):
"""Return a python dictionary of all the service's
properties."""
return self._properties
def __emit_properties_changed_signal(self, keys):
if self._dbus_helper:
self._dbus_helper.PublishedValueChanged(keys)
self.emit('property-changed', keys)
def set_property(self, key, value, sender=None):
"""Set one service property"""
if not self._local_publisher:
raise ValueError("Service was not not registered by requesting process!")
if sender is not None and self._local_publisher != sender:
raise ValueError("Service was not not registered by requesting process!")
if type(key) != type(u""):
raise ValueError("Key must be a unicode string.")
if type(value) != type(u"") and type(value) != type(True):
raise ValueError("Key must be a unicode string or a boolean.")
# Ignore setting the key to it's current value
if self._properties.has_key(key):
if self._properties[key] == value:
return
# Blank value means remove key
remove = False
if type(value) == type(u"") and len(value) == 0:
remove = True
if type(value) == type(False) and value == False:
remove = True
if remove:
# If the key wasn't present, return without error
if self._properties.has_key(key):
del self._properties[key]
else:
# Otherwise set it
if type(value) == type(True):
value = ""
self._properties[key] = value
# if the service is locally published already, update the TXT records
if self._local_publisher and self._avahi_entry_group:
self.__internal_update_avahi_properties()
self.__emit_properties_changed_signal([key])
def set_properties(self, properties, sender=None, from_network=False):
"""Set all service properties in one call"""
if sender is not None and self._local_publisher != sender:
raise ValueError("Service was not not registered by requesting process!")
self._internal_set_properties(properties, from_network)
def _internal_set_properties(self, properties, from_network=False):
"""Set the service's properties from either an Avahi
TXT record (a list of lists of integers), or a
python dictionary."""
if type(properties) != type({}):
raise ValueError("Properties must be a dictionary.")
# Make sure the properties are actually different
diff_keys = _dicts_differ(self._properties, properties)
if len(diff_keys) == 0:
return
self._properties = {}
# Set key/value pairs on internal property list
for key, value in properties.items():
if len(key) == 0:
continue
tmp_key = key
tmp_val = value
if type(tmp_key) != type(u""):
tmp_key = unicode(tmp_key)
if type(tmp_val) != type(u""):
tmp_val = unicode(tmp_val)
self._properties[tmp_key] = tmp_val
# if the service is locally published already, update the TXT records
if self._local_publisher and self._avahi_entry_group and not from_network:
self.__internal_update_avahi_properties()
self.__emit_properties_changed_signal(diff_keys)
def __internal_update_avahi_properties(self):
info = _convert_properties_to_dbus_byte_array(self._properties)
self._avahi_entry_group.UpdateServiceTxt(avahi.IF_UNSPEC,
avahi.PROTO_UNSPEC, 0,
dbus.String(self._full_name), dbus.String(self._stype),
dbus.String(self._domain), info)
def get_type(self):
"""Return the service's service type."""
return self._stype
def get_activity_id(self):
"""Return the activity ID this service is associated with, if any."""
return self._activity_id
def get_port(self):
return self._port
def set_port(self, port):
if type(port) != type(1) or (port <= 1024 and port > 65536):
raise ValueError("must specify a valid port number between 1024 and 65536.")
self._port = port
def get_source_address(self):
return self._source_address
def set_source_address(self, address):
if not address or type(address) != type(u""):
raise ValueError("address must be unicode")
self._source_address = address
def get_address(self):
return self._address
def set_address(self, address):
if not address or type(address) != type(u""):
raise ValueError("address must be a unicode string")
self._address = address
self._properties['address'] = address
def get_domain(self):
"""Return the ZeroConf/mDNS domain the service was found in."""
return self._domain
def register(self, system_bus, avahi_service):
if self._avahi_entry_group is not None:
raise RuntimeError("Service already registered!")
obj = system_bus.get_object(avahi.DBUS_NAME, avahi_service.EntryGroupNew())
self._avahi_entry_group = dbus.Interface(obj, avahi.DBUS_INTERFACE_ENTRY_GROUP)
info = _convert_properties_to_dbus_byte_array(self._properties)
logging.debug("Will register service with name='%s', stype='%s'," \
" domain='%s', address='%s', port=%d, info='%s'" % (self._full_name,
self._stype, self._domain, self._address, self._port, info))
self._avahi_entry_group.AddService(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC, 0,
dbus.String(self._full_name), dbus.String(self._stype),
dbus.String(self._domain), dbus.String(""), # let Avahi figure the 'host' out
dbus.UInt16(self._port), info)
self._avahi_entry_group.connect_to_signal('StateChanged', self.__entry_group_changed_cb)
self._avahi_entry_group.Commit()
def __entry_group_changed_cb(self, state, error):
logging.debug("** %s.%s Entry group changed: state %s, error %s" % (self._full_name, self._stype, state, error))
def unregister(self, sender):
# Refuse to unregister if we can't get the dbus connection this request
# came from for some reason
if not sender:
raise RuntimeError("Service registration request must have a sender.")
if not self._local_publisher:
raise ValueError("Service was not a local service provided by this laptop!")
if sender is not None and self._local_publisher != sender:
raise ValueError("Service was not registered by requesting process!")
if not self._avahi_entry_group:
raise ValueError("Service was not registered by requesting process!")
self._avahi_entry_group.Free()
del self._avahi_entry_group
self._avahi_entry_group = None
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#################################################################
# Tests
#################################################################
import unittest
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__objid_seq = 0
def _next_objid():
global __objid_seq
__objid_seq = __objid_seq + 1
return __objid_seq
class ServiceTestCase(unittest.TestCase):
_DEF_NAME = u"foobar"
_DEF_STYPE = u"_foo._bar._tcp"
_DEF_DOMAIN = u"local"
_DEF_ADDRESS = u"1.1.1.1"
_DEF_PORT = 1234
_DEF_PROPS = {'foobar': 'baz'}
_STR_TEST_ARGS = [None, 0, [], {}]
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def __init__(self, name):
self._bus = dbus.SessionBus()
self._bus_name = dbus.service.BusName('org.laptop.Presence', bus=self._bus)
unittest.TestCase.__init__(self, name)
def __del__(self):
del self._bus_name
del self._bus
def _test_init_fail(self, name, stype, domain, address, port, properties, fail_msg):
"""Test something we expect to fail."""
try:
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objid = _next_objid()
service = Service(self._bus_name, objid, name, stype, domain, address,
port, properties)
except ValueError, exc:
pass
else:
self.fail("expected a ValueError for %s." % fail_msg)
def testName(self):
for item in self._STR_TEST_ARGS:
self._test_init_fail(item, self._DEF_STYPE, self._DEF_DOMAIN, self._DEF_ADDRESS,
self._DEF_PORT, self._DEF_PROPS, "invalid name")
def testType(self):
for item in self._STR_TEST_ARGS:
self._test_init_fail(self._DEF_NAME, item, self._DEF_DOMAIN, self._DEF_ADDRESS,
self._DEF_PORT, self._DEF_PROPS, "invalid service type")
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self._test_init_fail(self._DEF_NAME, u"_bork._foobar", self._DEF_DOMAIN, self._DEF_ADDRESS,
self._DEF_PORT, self._DEF_PROPS, "invalid service type")
def testDomain(self):
for item in self._STR_TEST_ARGS:
self._test_init_fail(self._DEF_NAME, self._DEF_STYPE, item, self._DEF_ADDRESS,
self._DEF_PORT, self._DEF_PROPS, "invalid domain")
# Only accept local for now
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self._test_init_fail(self._DEF_NAME, self._DEF_STYPE, u"foobar", self._DEF_ADDRESS,
self._DEF_PORT, self._DEF_PROPS, "invalid domain")
# Make sure "" works
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objid = _next_objid()
service = Service(self._bus_name, objid, self._DEF_NAME, self._DEF_STYPE, u"",
self._DEF_ADDRESS, self._DEF_PORT, self._DEF_PROPS)
assert service, "Empty domain was not accepted!"
def testAddress(self):
self._test_init_fail(self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN, [],
self._DEF_PORT, self._DEF_PROPS, "invalid address")
self._test_init_fail(self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN, {},
self._DEF_PORT, self._DEF_PROPS, "invalid address")
self._test_init_fail(self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN, 1234,
self._DEF_PORT, self._DEF_PROPS, "invalid address")
def testPort(self):
self._test_init_fail(self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN, self._DEF_ADDRESS,
[], self._DEF_PROPS, "invalid port")
self._test_init_fail(self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN, self._DEF_ADDRESS,
{}, self._DEF_PROPS, "invalid port")
self._test_init_fail(self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN, self._DEF_ADDRESS,
"adf", self._DEF_PROPS, "invalid port")
def testGoodInit(self):
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objid = _next_objid()
service = Service(self._bus_name, objid, self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN,
self._DEF_ADDRESS, self._DEF_PORT, self._DEF_PROPS)
assert service.get_name() == self._DEF_NAME, "service name wasn't correct after init."
assert service.get_type() == self._DEF_STYPE, "service type wasn't correct after init."
assert service.get_domain() == "local", "service domain wasn't correct after init."
assert service.get_address() == self._DEF_ADDRESS, "service address wasn't correct after init."
assert service.get_port() == self._DEF_PORT, "service port wasn't correct after init."
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assert service.object_path() == SERVICE_DBUS_OBJECT_PATH + str(objid)
value = service.get_one_property('foobar')
assert value and value == 'baz', "service property wasn't correct after init."
def testAvahiProperties(self):
props = [[111, 114, 103, 46, 102, 114, 101, 101, 100, 101, 115, 107, 116, 111, 112, 46, 65, 118, 97, 104, 105, 46, 99, 111, 111, 107, 105, 101, 61, 50, 54, 48, 49, 53, 52, 51, 57, 53, 50]]
key = "org.freedesktop.Avahi.cookie"
expected_value = "2601543952"
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objid = _next_objid()
service = Service(self._bus_name, objid, self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN,
self._DEF_ADDRESS, self._DEF_PORT, props)
value = service.get_one_property(key)
assert value and value == expected_value, "service properties weren't correct after init."
value = service.get_one_property('bork')
assert not value, "service properties weren't correct after init."
def testBoolProperty(self):
props = [[111, 114, 103, 46, 102, 114, 101, 101, 100, 101, 115, 107, 116, 111, 112, 46, 65, 118, 97, 104, 105, 46, 99, 111, 111, 107, 105, 101]]
key = "org.freedesktop.Avahi.cookie"
expected_value = True
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objid = _next_objid()
service = Service(self._bus_name, objid, self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN, self._DEF_ADDRESS,
self._DEF_PORT, props)
value = service.get_one_property(key)
assert value is not None and value == expected_value, "service properties weren't correct after init."
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def testActivityService(self):
# Valid group service type, non-multicast address
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actid = "4569a71b80805aa96a847f7ac1c407327b3ec2b4"
name = compose_service_name("Tommy", actid)
# Valid activity service name, None address
objid = _next_objid()
service = Service(self._bus_name, objid, name, self._DEF_STYPE, self._DEF_DOMAIN, None,
self._DEF_PORT, self._DEF_PROPS)
assert service.get_address() == None, "address was not None as expected!"
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assert service.get_activity_id() == actid, "activity id was different than expected!"
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# Valid activity service name and multicast address, ensure it works
mc_addr = u"224.0.0.34"
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objid = _next_objid()
service = Service(self._bus_name, objid, name, self._DEF_STYPE, self._DEF_DOMAIN, mc_addr,
self._DEF_PORT, self._DEF_PROPS)
assert service.get_address() == mc_addr, "address was not expected address!"
def addToSuite(suite):
suite.addTest(ServiceTestCase("testName"))
suite.addTest(ServiceTestCase("testType"))
suite.addTest(ServiceTestCase("testDomain"))
suite.addTest(ServiceTestCase("testAddress"))
suite.addTest(ServiceTestCase("testPort"))
suite.addTest(ServiceTestCase("testGoodInit"))
suite.addTest(ServiceTestCase("testAvahiProperties"))
suite.addTest(ServiceTestCase("testBoolProperty"))
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suite.addTest(ServiceTestCase("testActivityService"))
addToSuite = staticmethod(addToSuite)
def main():
suite = unittest.TestSuite()
ServiceTestCase.addToSuite(suite)
runner = unittest.TextTestRunner()
runner.run(suite)
if __name__ == "__main__":
main()