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|
import avahi, dbus, dbus.glib, gobject
import Buddy
import Service
import Activity
import random
import logging
from sugar import util
_SA_UNRESOLVED = 0
_SA_RESOLVE_PENDING = 1
_SA_RESOLVED = 2
class ServiceAdv(object):
"""Wrapper class to track services from Avahi."""
def __init__(self, interface, protocol, name, stype, domain, local):
self._interface = interface
self._protocol = protocol
if type(name) != type(u""):
raise ValueError("service advertisement name must be unicode.")
self._name = name
if type(stype) != type(u""):
raise ValueError("service advertisement type must be unicode.")
self._stype = stype
if type(domain) != type(u""):
raise ValueError("service advertisement domain must be unicode.")
self._domain = domain
self._service = None
if type(local) != type(False):
raise ValueError("local must be a boolean.")
self._local = local
self._state = _SA_UNRESOLVED
self._resolver = None
def __del__(self):
if self._resolver:
del self._resolver
def interface(self):
return self._interface
def protocol(self):
return self._protocol
def name(self):
return self._name
def stype(self):
return self._stype
def domain(self):
return self._domain
def is_local(self):
return self._local
def service(self):
return self._service
def set_service(self, service):
if not isinstance(service, Service.Service):
raise ValueError("must be a valid service.")
if service != self._service:
self._service = service
def resolver(self):
return self._resolver
def set_resolver(self, resolver):
if not isinstance(resolver, dbus.Interface):
raise ValueError("must be a valid dbus object")
self._resolver = resolver
def state(self):
return self._state
def set_state(self, state):
if state == _SA_RESOLVE_PENDING:
if self._state == _SA_RESOLVED:
raise ValueError("Can't reset to resolve pending from resolved.")
self._state = state
class RegisteredServiceType(object):
def __init__(self, stype):
self._stype = stype
self._refcount = 1
def get_type(self):
return self._stype
def ref(self):
self._refcount += 1
def unref(self):
self._refcount -= 1
return self._refcount
def _txt_to_dict(txt):
"""Convert an avahi-returned TXT record formatted
as nested arrays of integers (from dbus) into a dict
of key/value string pairs."""
prop_dict = {}
props = avahi.txt_array_to_string_array(txt)
for item in props:
key = value = None
if '=' not in item:
# No = means a boolean value of true
key = item
value = True
else:
(key, value) = item.split('=')
prop_dict[key] = value
return prop_dict
_PRESENCE_SERVICE = "org.laptop.Presence"
_PRESENCE_DBUS_INTERFACE = "org.laptop.Presence"
_PRESENCE_OBJECT_PATH = "/org/laptop/Presence"
class NotFoundError(Exception):
pass
class PresenceServiceDBusHelper(dbus.service.Object):
def __init__(self, parent, bus_name):
self._parent = parent
self._bus_name = bus_name
dbus.service.Object.__init__(self, bus_name, _PRESENCE_OBJECT_PATH)
@dbus.service.signal(_PRESENCE_DBUS_INTERFACE,
signature="o")
def BuddyAppeared(self, object_path):
pass
@dbus.service.signal(_PRESENCE_DBUS_INTERFACE,
signature="o")
def BuddyDisappeared(self, object_path):
pass
@dbus.service.signal(_PRESENCE_DBUS_INTERFACE,
signature="o")
def ServiceAppeared(self, object_path):
pass
@dbus.service.signal(_PRESENCE_DBUS_INTERFACE,
signature="o")
def ServiceDisappeared(self, object_path):
pass
@dbus.service.signal(_PRESENCE_DBUS_INTERFACE,
signature="o")
def ActivityAppeared(self, object_path):
pass
@dbus.service.signal(_PRESENCE_DBUS_INTERFACE,
signature="o")
def ActivityDisappeared(self, object_path):
pass
@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
in_signature="", out_signature="ao")
def getServices(self):
services = self._parent.get_services()
ret = []
for serv in services:
ret.append(serv.object_path())
return ret
@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
in_signature="s", out_signature="ao")
def getServicesOfType(self, stype):
services = self._parent.get_services_of_type(stype)
ret = []
for serv in services:
ret.append(serv.object_path())
return ret
@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
in_signature="", out_signature="ao")
def getActivities(self):
activities = self._parent.get_activities()
ret = []
for act in activities:
ret.append(act.object_path())
return ret
@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
in_signature="s", out_signature="o")
def getActivity(self, actid):
act = self._parent.get_activity(actid)
if not act:
raise NotFoundError("Not found")
return act.object_path()
@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
in_signature="", out_signature="ao")
def getBuddies(self):
buddies = self._parent.get_buddies()
ret = []
for buddy in buddies:
ret.append(buddy.object_path())
return ret
@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
in_signature="s", out_signature="o")
def getBuddyByName(self, name):
buddy = self._parent.get_buddy_by_name(name)
if not buddy:
raise NotFoundError("Not found")
return buddy.object_path()
@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
in_signature="s", out_signature="o")
def getBuddyByAddress(self, addr):
buddy = self._parent.get_buddy_by_address(addr)
if not buddy:
raise NotFoundError("Not found")
return buddy.object_path()
@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
in_signature="", out_signature="o")
def getOwner(self):
owner = self._parent.get_owner()
if not owner:
raise NotFoundError("Not found")
return owner.object_path()
@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
in_signature="os", out_signature="o",
sender_keyword="sender")
def joinActivity(self, activity_op, stype, sender):
found_activity = None
acts = self._parent.get_activities()
for act in acts:
if act.object_path() == activity_op:
found_activity = act
break
if not found_activity:
raise NotFoundError("The activity %s was not found." % activity_op)
return self._parent.join_activity(found_activity, stype, sender)
@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
in_signature="ssa{ss}sis", out_signature="o",
sender_keyword="sender")
def shareActivity(self, activity_id, stype, properties, address, port,
domain, sender=None):
if not len(address):
address = None
service = self._parent.share_activity(activity_id, stype, properties, address,
port, domain, sender)
return service.object_path()
@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
in_signature="ssa{ss}sis", out_signature="o",
sender_keyword="sender")
def registerService(self, name, stype, properties, address, port, domain,
sender=None):
if not len(address):
address = None
service = self._parent.register_service(name, stype, properties, address,
port, domain, sender)
return service.object_path()
@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
in_signature="o", out_signature="",
sender_keyword="sender")
def unregisterService(self, service_op, sender):
found_serv = None
services = self._parent.get_services()
for serv in services:
if serv.object_path() == service_op:
found_serv = serv
break
if not found_serv:
raise NotFoundError("The activity %s was not found." % service_op)
return self._parent.unregister_service(found_serv, sender)
@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
in_signature="s", out_signature="")
def registerServiceType(self, stype):
self._parent.register_service_type(stype)
@dbus.service.method(_PRESENCE_DBUS_INTERFACE,
in_signature="s", out_signature="")
def unregisterServiceType(self, stype):
self._parent.unregister_service_type(stype)
@dbus.service.method(_PRESENCE_DBUS_INTERFACE)
def start(self):
self._parent.start()
class PresenceService(object):
def __init__(self):
# interface -> IP address: interfaces we've gotten events on so far
self._local_addrs = {}
self._next_object_id = 0
self._buddies = {} # nick -> Buddy
self._services = {} # (name, type) -> Service
self._activities = {} # activity id -> Activity
# Keep track of stuff we're already browsing
self._service_type_browsers = {}
self._service_browsers = {}
# Resolved service list
self._service_advs = []
# Service types we care about resolving
self._registered_service_types = []
# Set up the dbus service we provide
self._session_bus = dbus.SessionBus()
self._bus_name = dbus.service.BusName(_PRESENCE_SERVICE, bus=self._session_bus)
self._dbus_helper = PresenceServiceDBusHelper(self, self._bus_name)
# Our owner object
objid = self._get_next_object_id()
self._owner = Buddy.Owner(self, self._bus_name, objid)
self._buddies[self._owner.get_name()] = self._owner
self._started = False
def start(self):
if self._started:
return
self._started = True
# Connect to Avahi for mDNS stuff
self._system_bus = dbus.SystemBus()
self._mdns_service = dbus.Interface(self._system_bus.get_object(avahi.DBUS_NAME,
avahi.DBUS_PATH_SERVER), avahi.DBUS_INTERFACE_SERVER)
# Always browse .local
self._new_domain_cb(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC, "local")
# Connect to Avahi and start looking for stuff
domain_browser = self._mdns_service.DomainBrowserNew(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC,
"", avahi.DOMAIN_BROWSER_BROWSE, dbus.UInt32(0))
db = dbus.Interface(self._system_bus.get_object(avahi.DBUS_NAME, domain_browser), avahi.DBUS_INTERFACE_DOMAIN_BROWSER)
db.connect_to_signal('ItemNew', self._new_domain_cb_glue)
def _get_next_object_id(self):
"""Increment and return the object ID counter."""
self._next_object_id = self._next_object_id + 1
return self._next_object_id
def get_services(self):
return self._services.values()
def get_services_of_type(self, stype):
ret = []
for serv in self._services.values():
if serv.get_type() == stype:
ret.append(serv)
return ret
def get_activities(self):
# Only return valid activities
ret = []
for act in self._activities.values():
if act.is_valid():
ret.append(act)
return ret
def get_activity(self, actid):
if self._activities.has_key(actid):
act = self._activities[actid]
if act.is_valid():
return act
return None
def get_buddies(self):
buddies = []
for buddy in self._buddies.values():
if buddy.is_valid():
buddies.append(buddy)
return buddies
def get_buddy_by_name(self, name):
if self._buddies.has_key(name):
if self._buddies[name].is_valid():
return self._buddies[name]
return None
def get_buddy_by_address(self, address):
for buddy in self._buddies.values():
if buddy.get_address() == address and buddy.is_valid():
return buddy
return None
def get_owner(self):
return self._owner
def _find_service_adv(self, interface=None, protocol=None, name=None,
stype=None, domain=None, local=None):
"""Search a list of service advertisements for ones matching
certain criteria."""
adv_list = []
for adv in self._service_advs:
if interface and adv.interface() != interface:
continue
if protocol and adv.protocol() != protocol:
continue
if name and adv.name() != name:
continue
if stype and adv.stype() != stype:
continue
if domain and adv.domain() != domain:
continue
if local is not None and adv.is_local() != local:
continue
adv_list.append(adv)
return adv_list
def _find_registered_service_type(self, stype):
for item in self._registered_service_types:
if item.get_type() == stype:
return item
return None
def _handle_new_service_for_buddy(self, service, local):
"""Deal with a new discovered service object."""
# Once a service is resolved, we match it up to an existing buddy,
# or create a new Buddy if this is the first service known about the buddy
buddy_was_valid = False
name = service.get_name()
buddy = None
try:
buddy = self._buddies[name]
buddy_was_valid = buddy.is_valid()
service_added = buddy.add_service(service)
if service_added:
self._dbus_helper.ServiceAppeared(service.object_path())
except KeyError:
source_addr = service.get_source_address()
objid = self._get_next_object_id()
buddy = Buddy.Buddy(self._bus_name, objid, service)
self._buddies[name] = buddy
self._dbus_helper.ServiceAppeared(service.object_path())
if not buddy_was_valid and buddy.is_valid():
self._dbus_helper.BuddyAppeared(buddy.object_path())
return buddy
def _handle_new_activity_service(self, service):
# If the serivce is an activity service, merge it into our activities list
actid = service.get_activity_id()
if not actid:
return
activity = None
was_valid = False
if not self._activities.has_key(actid):
objid = self._get_next_object_id()
activity = Activity.Activity(self._bus_name, objid, service)
self._activities[actid] = activity
else:
activity = self._activities[actid]
was_valid = activity.is_valid()
if activity:
activity.add_service(service)
if not was_valid and activity.is_valid():
self._dbus_helper.ActivityAppeared(activity.object_path())
def _handle_remove_activity_service(self, service):
actid = service.get_activity_id()
if not actid:
return
if not self._activities.has_key(actid):
return
activity = self._activities[actid]
activity.remove_service(service)
if len(activity.get_services()) == 0:
# Kill the activity
self._dbus_helper.ActivityDisappeared(activity.object_path())
del self._activities[actid]
def _service_resolved_cb(self, adv, interface, protocol, full_name,
stype, domain, host, aprotocol, address, port, txt, flags,
updated):
"""When the service discovery finally gets here, we've got enough
information about the service to assign it to a buddy."""
if updated == False:
logging.debug("Resolved service '%s' type '%s' domain '%s' to " \
" %s:%s" % (full_name, stype, domain, address, port))
if not adv in self._service_advs:
return False
if adv.state() != _SA_RESOLVED:
return False
# See if we know about this service already
service = None
key = (full_name, stype)
props = _txt_to_dict(txt)
if not self._services.has_key(key):
objid = self._get_next_object_id()
service = Service.Service(self._bus_name, objid, name=full_name,
stype=stype, domain=domain, address=address, port=port,
properties=props, source_address=address)
self._services[key] = service
else:
# Already tracking this service; either:
# a) we were the one that shared it in the first place,
# and therefore the source address would not have
# been set yet
# b) the service has been updated
service = self._services[key]
if not service.get_source_address():
service.set_source_address(address)
if not service.get_address():
service.set_address(address)
adv.set_service(service)
if service and updated:
service.set_properties(props, from_network=True)
return False
# Merge the service into our buddy and activity lists, if needed
buddy = self._handle_new_service_for_buddy(service, adv.is_local())
if buddy and service.get_activity_id():
self._handle_new_activity_service(service)
return False
def _service_resolved_cb_glue(self, adv, interface, protocol, name,
stype, domain, host, aprotocol, address, port, txt, flags):
# Avahi doesn't flag updates to existing services, so we have
# to determine that here
updated = False
if adv.state() == _SA_RESOLVED:
updated = True
adv.set_state(_SA_RESOLVED)
gobject.idle_add(self._service_resolved_cb, adv, interface,
protocol, name, stype, domain, host, aprotocol, address,
port, txt, flags, updated)
def _service_resolved_failure_cb(self, adv, err):
adv.set_state(_SA_UNRESOLVED)
logging.error("Error resolving service %s.%s: %s" % (adv.name(), adv.stype(), err))
def _resolve_service(self, adv):
"""Resolve and lookup a ZeroConf service to obtain its address and TXT records."""
# Ask avahi to resolve this particular service
path = self._mdns_service.ServiceResolverNew(dbus.Int32(adv.interface()),
dbus.Int32(adv.protocol()), adv.name(), adv.stype(), adv.domain(),
avahi.PROTO_UNSPEC, dbus.UInt32(0))
resolver = dbus.Interface(self._system_bus.get_object(avahi.DBUS_NAME, path),
avahi.DBUS_INTERFACE_SERVICE_RESOLVER)
resolver.connect_to_signal('Found', lambda *args: self._service_resolved_cb_glue(adv, *args))
resolver.connect_to_signal('Failure', lambda *args: self._service_resolved_failure_cb(adv, *args))
adv.set_resolver(resolver)
return False
def _service_appeared_cb(self, interface, protocol, full_name, stype, domain, flags):
local = flags & avahi.LOOKUP_RESULT_OUR_OWN > 0
adv_list = self._find_service_adv(interface=interface, protocol=protocol,
name=full_name, stype=stype, domain=domain, local=local)
adv = None
if not adv_list:
adv = ServiceAdv(interface=interface, protocol=protocol, name=full_name,
stype=stype, domain=domain, local=local)
self._service_advs.append(adv)
else:
adv = adv_list[0]
# Decompose service name if we can
(actid, buddy_name) = Service.decompose_service_name(full_name)
# If we care about the service right now, resolve it
resolve = False
item = self._find_registered_service_type(stype)
if actid is not None or item is not None:
resolve = True
if resolve and adv.state() == _SA_UNRESOLVED:
logging.debug("Found '%s' (%d) of type '%s' in domain" \
" '%s' on %i.%i; will resolve." % (full_name, flags, stype,
domain, interface, protocol))
adv.set_state(_SA_RESOLVE_PENDING)
gobject.idle_add(self._resolve_service, adv)
return False
def _service_appeared_cb_glue(self, interface, protocol, name, stype, domain, flags):
gobject.idle_add(self._service_appeared_cb, interface, protocol, name, stype, domain, flags)
def _service_disappeared_cb(self, interface, protocol, full_name, stype, domain, flags):
local = flags & avahi.LOOKUP_RESULT_OUR_OWN > 0
# If it's an unresolved service, remove it from our unresolved list
adv_list = self._find_service_adv(interface=interface, protocol=protocol,
name=full_name, stype=stype, domain=domain, local=local)
if not adv_list:
return False
# Get the service object; if none, we have nothing left to do
adv = adv_list[0]
service = adv.service()
self._service_advs.remove(adv)
del adv
if not service:
return False
logging.debug("Service %s.%s in domain %s on %i.%i disappeared." % (full_name,
stype, domain, interface, protocol))
self._dbus_helper.ServiceDisappeared(service.object_path())
self._handle_remove_activity_service(service)
# 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)
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)
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:
str_exc = str(exc)
logging.error("got exception %s while attempting to browse domain %s on %i.%i" % (str_exc, domain, interface, protocol))
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("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, sender):
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]
props = act_service.get_properties()
color = activity.get_color()
if color:
props['color'] = color
return self._share_activity(activity.get_id(), stype, properties,
act_service.get_address(), act_service.get_port(),
act_service.get_domain(), sender)
def share_activity(self, activity_id, stype, properties=None, address=None,
port=-1, domain=u"local", sender=None):
"""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")
color = self._owner.get_color()
if color:
properties['color'] = color
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, sender)
def register_service(self, name, stype, properties={}, address=None,
port=-1, domain=u"local", sender=None):
"""Register a new service, advertising it to other Buddies on the network."""
# Refuse to register 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.")
(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)
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,
local_publisher=sender)
self._services[(name, stype)] = service
self.register_service_type(stype)
service.register(self._system_bus, self._mdns_service)
return service
def unregister_service(self, service, sender=None):
service.unregister(sender)
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 we've already registered it as a service type, ref it and return
item = self._find_registered_service_type(stype)
if item is not None:
item.ref()
return
# Otherwise track this type now
obj = RegisteredServiceType(stype)
self._registered_service_types.append(obj)
# 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.state() == _SA_UNRESOLVED:
adv.set_state(_SA_RESOLVE_PENDING)
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 it was found, unref it and possibly remove it
item = self._find_registered_service_type(stype)
if not item:
return
if item.unref() <= 0:
self._registered_service_types.remove(item)
del item
def main():
from sugar import TracebackUtils
loop = gobject.MainLoop()
ps = PresenceService()
tbh = TracebackUtils.TracebackHelper()
try:
loop.run()
except KeyboardInterrupt:
print 'Ctrl+C pressed, exiting...'
del tbh
if __name__ == "__main__":
main()
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