424 lines
15 KiB
Python
424 lines
15 KiB
Python
import avahi
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import sys, os
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sys.path.insert(0, os.path.abspath("../../"))
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from sugar import util
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import dbus, dbus.service
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def _txt_to_dict(txt):
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"""Convert an avahi-returned TXT record formatted
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as nested arrays of integers (from dbus) into a dict
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of key/value string pairs."""
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prop_dict = {}
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props = avahi.txt_array_to_string_array(txt)
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for item in props:
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key = value = None
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if '=' not in item:
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# No = means a boolean value of true
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key = item
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value = True
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else:
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(key, value) = item.split('=')
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prop_dict[key] = value
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return prop_dict
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def compose_service_name(name, activity_id):
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if type(name) == type(""):
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name = unicode(name)
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if not name:
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raise ValueError("name must be a valid string.")
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if not activity_id:
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return name
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if type(name) != type(u""):
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raise ValueError("name must be in unicode.")
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composed = "%s [%s]" % (name, activity_id)
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return composed
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def _decompose_service_name(name):
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"""Break a service name into the name and activity ID, if we can."""
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if type(name) != type(u""):
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raise ValueError("name must be a valid unicode string.")
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name_len = len(name)
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if name_len < util.ACTIVITY_ID_LEN + 5:
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return (None, name)
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# check for activity id end marker
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if name[name_len - 1] != "]":
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return (None, name)
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start = name_len - 1 - util.ACTIVITY_ID_LEN
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end = name_len - 1
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# check for activity id start marker
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if name[start - 1] != "[" or name[start - 2] != " ":
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return (None, name)
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activity_id = name[start:end]
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if not util.validate_activity_id(activity_id):
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return (None, name)
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return (activity_id, name[:start - 2])
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def is_multicast_address(address):
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"""Simple numerical check for whether an IP4 address
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is in the range for multicast addresses or not."""
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if not address:
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return False
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if address[3] != '.':
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return False
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first = int(float(address[:3]))
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if first >= 224 and first <= 239:
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return True
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return False
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_ACTIVITY_ID_TAG = "ActivityID"
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SERVICE_DBUS_INTERFACE = "org.laptop.Presence.Service"
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SERVICE_DBUS_OBJECT_PATH = "/org/laptop/Presence/Services/"
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class ServiceDBusHelper(dbus.service.Object):
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"""Handle dbus requests and signals for Service objects"""
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def __init__(self, parent, bus_name, object_path):
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self._parent = parent
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self._bus_name = bus_name
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self._object_path = object_path
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dbus.service.Object.__init__(self, bus_name, self._object_path)
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@dbus.service.method(SERVICE_DBUS_INTERFACE,
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in_signature="", out_signature="a{sv}")
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def getProperties(self):
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"""Return service properties."""
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pary = {}
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pary['name'] = self._parent.get_name()
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pary['type'] = self._parent.get_type()
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pary['domain'] = self._parent.get_domain()
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pary['activityId'] = self._parent.get_activity_id()
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port = self._parent.get_port()
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if port:
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pary['port'] = self._parent.get_port()
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addr = self._parent.get_address()
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if addr:
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pary['address'] = addr
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source_addr = self._parent.get_publisher_address()
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if source_addr:
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pary['sourceAddress'] = source_addr
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return pary
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@dbus.service.method(SERVICE_DBUS_INTERFACE,
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in_signature="s", out_signature="s")
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def getPublishedValue(self, key):
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"""Return the value belonging to the requested key from the
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service's TXT records."""
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value = self._parent.get_one_property(key)
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if type(value) == type(True):
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value = str(value)
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return value
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class Service(object):
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"""Encapsulates information about a specific ZeroConf/mDNS
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service as advertised on the network."""
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def __init__(self, bus_name, object_id, name, stype, domain=u"local", address=None, port=-1, properties=None):
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if not bus_name:
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raise ValueError("DBus bus name must be valid")
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if not object_id or type(object_id) != type(1):
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raise ValueError("object id must be a valid number")
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# Validate immutable options
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if name and type(name) != type(u""):
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raise ValueError("name must be unicode.")
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if not name or not len(name):
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raise ValueError("must specify a valid service name.")
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if stype and type(stype) != type(u""):
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raise ValueError("service type must be in unicode.")
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if not stype or not len(stype):
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raise ValueError("must specify a valid service type.")
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if not stype.endswith("._tcp") and not stype.endswith("._udp"):
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raise ValueError("must specify a TCP or UDP service type.")
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if type(domain) != type(u""):
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raise ValueError("domain must be in unicode.")
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if domain and domain != "local":
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raise ValueError("must use the 'local' domain (for now).")
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(actid, real_name) = _decompose_service_name(name)
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self._name = real_name
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self._full_name = name
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self._stype = stype
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self._domain = domain
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self._port = -1
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self.set_port(port)
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self._properties = {}
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self.set_properties(properties)
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# Publisher address is the unicast source IP
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self._publisher_address = address
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# Address is the published address, could be multicast or unicast
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self._address = None
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if self._properties.has_key('address'):
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self.set_address(self._properties['address'])
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else:
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self.set_address(address)
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# Ensure that an ActivityID tag, if given, matches
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# what we expect from the service type
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if self._properties.has_key(_ACTIVITY_ID_TAG):
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prop_actid = self._properties[_ACTIVITY_ID_TAG]
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if (prop_actid and not actid) or (prop_actid != actid):
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raise ValueError("ActivityID property specified, but the service names's activity ID didn't match it: %s, %s" % (prop_actid, actid))
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self._activity_id = actid
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if actid and not self._properties.has_key(_ACTIVITY_ID_TAG):
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self._properties[_ACTIVITY_ID_TAG] = actid
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self._owner = None
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# register ourselves with dbus
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self._object_id = object_id
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self._object_path = SERVICE_DBUS_OBJECT_PATH + str(self._object_id)
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self._dbus_helper = ServiceDBusHelper(self, bus_name, self._object_path)
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def object_path(self):
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return dbus.ObjectPath(self._object_path)
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def get_owner(self):
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return self._owner
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def set_owner(self, owner):
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if self._owner is not None:
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raise RuntimeError("Can only set a service's owner once")
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self._owner = owner
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def get_name(self):
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"""Return the service's name, usually that of the
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buddy who provides it."""
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return self._name
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def get_full_name(self):
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return self._full_name
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def is_multicast_service(self):
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"""Return True if the service's address is a multicast address,
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False if it is not."""
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return is_multicast_address(self._address)
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def get_one_property(self, key):
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"""Return one property of the service, or None
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if the property was not found. Cannot distinguish
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between lack of a property, and a property value that
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actually is None."""
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if key in self._properties.keys():
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return self._properties[key]
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return None
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def get_properties(self):
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"""Return a python dictionary of all the service's
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properties."""
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return self._properties
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def set_properties(self, properties):
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"""Set the service's properties from either an Avahi
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TXT record (a list of lists of integers), or a
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python dictionary."""
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self._properties = {}
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props = {}
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if type(properties) == type([]):
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props = _txt_to_dict(properties)
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elif type(properties) == type({}):
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props = properties
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# Set key/value pairs on internal property list
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for key, value in props.items():
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tmp_key = key
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tmp_val = value
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if type(tmp_key) == type(u""):
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tmp_key = tmp_key.encode()
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if type(tmp_val) == type(u""):
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tmp_val = tmp_val.encode()
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self._properties[tmp_key] = tmp_val
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def get_type(self):
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"""Return the service's service type."""
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return self._stype
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def get_activity_id(self):
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"""Return the activity ID this service is associated with, if any."""
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return self._activity_id
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def get_port(self):
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return self._port
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def set_port(self, port):
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if type(port) != type(1) or (port <= 1024 and port > 65536):
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raise ValueError("must specify a valid port number between 1024 and 65536.")
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self._port = port
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def get_publisher_address(self):
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return self._publisher_address
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def get_address(self):
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return self._address
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def set_address(self, address):
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if address is not None:
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if type(address) != type(u""):
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raise ValueError("address must be unicode")
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self._address = address
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def get_domain(self):
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"""Return the ZeroConf/mDNS domain the service was found in."""
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return self._domain
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#################################################################
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# Tests
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#################################################################
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import unittest
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__objid_seq = 0
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def _next_objid():
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global __objid_seq
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__objid_seq = __objid_seq + 1
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return __objid_seq
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class ServiceTestCase(unittest.TestCase):
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_DEF_NAME = u"foobar"
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_DEF_STYPE = u"_foo._bar._tcp"
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_DEF_DOMAIN = u"local"
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_DEF_ADDRESS = u"1.1.1.1"
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_DEF_PORT = 1234
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_DEF_PROPS = {'foobar': 'baz'}
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_STR_TEST_ARGS = [None, 0, [], {}]
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def __init__(self, name):
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self._bus = dbus.SessionBus()
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self._bus_name = dbus.service.BusName('org.laptop.Presence', bus=self._bus)
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unittest.TestCase.__init__(self, name)
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def __del__(self):
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del self._bus_name
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del self._bus
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def _test_init_fail(self, name, stype, domain, address, port, properties, fail_msg):
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"""Test something we expect to fail."""
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try:
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objid = _next_objid()
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service = Service(self._bus_name, objid, name, stype, domain, address,
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port, properties)
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except ValueError, exc:
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pass
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else:
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self.fail("expected a ValueError for %s." % fail_msg)
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def testName(self):
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for item in self._STR_TEST_ARGS:
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self._test_init_fail(item, self._DEF_STYPE, self._DEF_DOMAIN, self._DEF_ADDRESS,
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self._DEF_PORT, self._DEF_PROPS, "invalid name")
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def testType(self):
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for item in self._STR_TEST_ARGS:
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self._test_init_fail(self._DEF_NAME, item, self._DEF_DOMAIN, self._DEF_ADDRESS,
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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,
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self._DEF_PORT, self._DEF_PROPS, "invalid service type")
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def testDomain(self):
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for item in self._STR_TEST_ARGS:
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self._test_init_fail(self._DEF_NAME, self._DEF_STYPE, item, self._DEF_ADDRESS,
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self._DEF_PORT, self._DEF_PROPS, "invalid domain")
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# Only accept local for now
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self._test_init_fail(self._DEF_NAME, self._DEF_STYPE, u"foobar", self._DEF_ADDRESS,
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self._DEF_PORT, self._DEF_PROPS, "invalid domain")
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# Make sure "" works
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objid = _next_objid()
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service = Service(self._bus_name, objid, self._DEF_NAME, self._DEF_STYPE, u"",
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self._DEF_ADDRESS, self._DEF_PORT, self._DEF_PROPS)
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assert service, "Empty domain was not accepted!"
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def testAddress(self):
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self._test_init_fail(self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN, [],
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self._DEF_PORT, self._DEF_PROPS, "invalid address")
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self._test_init_fail(self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN, {},
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self._DEF_PORT, self._DEF_PROPS, "invalid address")
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self._test_init_fail(self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN, 1234,
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self._DEF_PORT, self._DEF_PROPS, "invalid address")
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def testPort(self):
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self._test_init_fail(self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN, self._DEF_ADDRESS,
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[], self._DEF_PROPS, "invalid port")
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self._test_init_fail(self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN, self._DEF_ADDRESS,
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{}, self._DEF_PROPS, "invalid port")
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self._test_init_fail(self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN, self._DEF_ADDRESS,
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"adf", self._DEF_PROPS, "invalid port")
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def testGoodInit(self):
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objid = _next_objid()
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service = Service(self._bus_name, objid, self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN,
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self._DEF_ADDRESS, self._DEF_PORT, self._DEF_PROPS)
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assert service.get_name() == self._DEF_NAME, "service name wasn't correct after init."
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assert service.get_type() == self._DEF_STYPE, "service type wasn't correct after init."
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assert service.get_domain() == "local", "service domain wasn't correct after init."
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assert service.get_address() == self._DEF_ADDRESS, "service address wasn't correct after init."
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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)
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value = service.get_one_property('foobar')
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assert value and value == 'baz', "service property wasn't correct after init."
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def testAvahiProperties(self):
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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]]
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key = "org.freedesktop.Avahi.cookie"
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expected_value = "2601543952"
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objid = _next_objid()
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service = Service(self._bus_name, objid, self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN,
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self._DEF_ADDRESS, self._DEF_PORT, props)
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value = service.get_one_property(key)
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assert value and value == expected_value, "service properties weren't correct after init."
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value = service.get_one_property('bork')
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assert not value, "service properties weren't correct after init."
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def testBoolProperty(self):
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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]]
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key = "org.freedesktop.Avahi.cookie"
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expected_value = True
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objid = _next_objid()
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service = Service(self._bus_name, objid, self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN, self._DEF_ADDRESS,
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self._DEF_PORT, props)
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value = service.get_one_property(key)
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assert value is not None and value == expected_value, "service properties weren't correct after init."
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def testActivityService(self):
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# Valid group service type, non-multicast address
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actid = "4569a71b80805aa96a847f7ac1c407327b3ec2b4"
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name = compose_service_name("Tommy", actid)
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# Valid activity service name, None address
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objid = _next_objid()
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service = Service(self._bus_name, objid, name, self._DEF_STYPE, self._DEF_DOMAIN, None,
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self._DEF_PORT, self._DEF_PROPS)
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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
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mc_addr = u"224.0.0.34"
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objid = _next_objid()
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service = Service(self._bus_name, objid, name, self._DEF_STYPE, self._DEF_DOMAIN, mc_addr,
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self._DEF_PORT, self._DEF_PROPS)
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assert service.get_address() == mc_addr, "address was not expected address!"
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def addToSuite(suite):
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suite.addTest(ServiceTestCase("testName"))
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suite.addTest(ServiceTestCase("testType"))
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suite.addTest(ServiceTestCase("testDomain"))
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suite.addTest(ServiceTestCase("testAddress"))
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suite.addTest(ServiceTestCase("testPort"))
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suite.addTest(ServiceTestCase("testGoodInit"))
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suite.addTest(ServiceTestCase("testAvahiProperties"))
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suite.addTest(ServiceTestCase("testBoolProperty"))
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suite.addTest(ServiceTestCase("testActivityService"))
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addToSuite = staticmethod(addToSuite)
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def main():
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suite = unittest.TestSuite()
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ServiceTestCase.addToSuite(suite)
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runner = unittest.TextTestRunner()
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runner.run(suite)
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if __name__ == "__main__":
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main()
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