initial import of zeroconf class (standalone)
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Stefan Bethge
parent
6953685979
commit
cd38def2e5
1 changed files with 188 additions and 0 deletions
188
src/zeroconf.py
Executable file
188
src/zeroconf.py
Executable file
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#!/usr/bin/python
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import os, sys
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try:
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import avahi, gobject, dbus
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except ImportError:
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print "Error: python-avahi and python-dbus need to be installed. No zeroconf support."
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try:
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import dbus.glib
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except ImportError, e:
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pass
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service_browsers = {}
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class Zeroconf:
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def __init__(self, name):
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self.domain = None # specific domain to browse
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self.stype = '_presence._tcp'
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self.port = 5298 # listening port that gets announced
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self.name = name # service name / username
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self.txt = {}
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self.contacts = {} # all current local contacts with data
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self.entrygroup = ''
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## handlers for dbus callbacks
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# error handler - maybe replace with gui version/gajim facilities
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def print_error_callback(self, err):
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print "Error:", str(err)
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def new_service_callback(self, interface, protocol, name, stype, domain, flags):
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print "Found service '%s' in domain '%s' on %i.%i." % (name, domain, interface, protocol)
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#synchronous resolving
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self.server.ResolveService( int(interface), int(protocol), name, stype, domain, avahi.PROTO_UNSPEC, dbus.UInt32(0), reply_handler=self.service_resolved_callback, error_handler=self.print_error_callback)
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def remove_service_callback(self, interface, protocol, name, stype, domain, flags):
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print "Service '%s' in domain '%s' on %i.%i disappeared." % (name, domain, interface, protocol)
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del self.contacts[(interface, name, domain)]
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def new_service_type(self, interface, protocol, stype, domain, flags):
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global service_browsers
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# Are we already browsing this domain for this type?
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if service_browsers.has_key((interface, protocol, stype, domain)):
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return
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print "Browsing for services of type '%s' in domain '%s' on %i.%i ..." % (stype, domain, interface, protocol)
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b = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME, \
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self.server.ServiceBrowserNew(interface, protocol, \
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stype, domain, dbus.UInt32(0))),avahi.DBUS_INTERFACE_SERVICE_BROWSER)
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b.connect_to_signal('ItemNew', self.new_service_callback)
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b.connect_to_signal('ItemRemove', self.remove_service_callback)
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service_browsers[(interface, protocol, stype, domain)] = b
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def new_domain_callback(self,interface, protocol, domain, flags):
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if domain != "local":
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self.browse_domain(interface, protocol, domain)
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def service_resolved_callback(self, interface, protocol, name, stype, domain, host, aprotocol, address, port, txt, flags):
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print "Service data for service '%s' in domain '%s' on %i.%i:" % (name, domain, interface, protocol)
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print "\tHost %s (%s), port %i, TXT data: %s" % (host, address, port, str(avahi.txt_array_to_string_array(txt)))
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self.contacts[(interface, name, domain)] = (interface, name, protocol, domain, host, address, port, txt)
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def service_added_callback(self):
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print "Service successfully added"
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def service_committed_callback(self):
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print "Service successfully committed"
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def service_updated_callback(self):
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print "Service successfully updated"
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def service_add_fail_callback(self, err):
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print "Error while adding service:", str(err)
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self.name = self.server.GetAlternativeServiceName(self.name)
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self.create_service()
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def server_state_changed_callback(self, state, error):
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print "server.state %s" % state
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if state == avahi.SERVER_RUNNING:
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self.create_service()
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elif state == avahi.SERVER_COLLISION:
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self.entrygroup.Reset()
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# elif state == avahi.CLIENT_FAILURE: # TODO: add error handling (avahi daemon dies...?)
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def entrygroup_state_changed_callback(self, state, error):
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# the name is already present, so ...
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if state == avahi.ENTRY_GROUP_COLLISION:
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print "Collision with existing service of name %s" % self.name
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# ... get a new one and recreate the service
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self.name = self.server.GetAlternativeServiceName(self.name)
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self.create_service()
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# elif state == avahi.ENTRY_GROUP_FAILURE:
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def create_service(self):
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if self.entrygroup == '':
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# create an EntryGroup for publishing
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self.entrygroup = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME, self.server.EntryGroupNew()), avahi.DBUS_INTERFACE_ENTRY_GROUP)
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self.entrygroup.connect_to_signal('StateChanged', self.entrygroup_state_changed_callback)
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self.txt[('port.p2pj')] = self.port
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self.txt[('version')] = 1
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self.txt[('textvers')] = 1
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print "Publishing service '%s' of type %s" % (self.name, self.stype)
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self.entrygroup.AddService(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC, dbus.UInt32(0), self.name, self.stype, '', '', self.port, avahi.dict_to_txt_array(self.txt), reply_handler=self.service_added_callback, error_handler=self.service_add_fail_callback)
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self.entrygroup.Commit(reply_handler=self.service_committed_callback, error_handler=self.print_error_callback)
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def publish(self):
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state = self.server.GetState()
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if state == avahi.SERVER_RUNNING:
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self.create_service()
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def remove_announce(self):
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self.entrygroup.Reset()
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self.entrygroup.Free()
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def browse_domain(self, interface, protocol, domain):
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self.new_service_type(interface, protocol, self.stype, domain, '')
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# connect to dbus
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def connect(self):
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self.bus = dbus.SystemBus()
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self.server = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME, \
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avahi.DBUS_PATH_SERVER), avahi.DBUS_INTERFACE_SERVER)
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self.server.connect_to_signal('StateChanged', self.server_state_changed_callback)
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# start browsing
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if self.domain is None:
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# Explicitly browse .local
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self.browse_domain(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC, "local")
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# Browse for other browsable domains
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db = dbus.Interface(self.bus.get_object(avahi.DBUS_NAME, \
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self.server.DomainBrowserNew(avahi.IF_UNSPEC, \
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avahi.PROTO_UNSPEC, '', avahi.DOMAIN_BROWSER_BROWSE,\
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dbus.UInt32(0))), avahi.DBUS_INTERFACE_DOMAIN_BROWSER)
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db.connect_to_signal('ItemNew', self.new_domain_callback)
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else:
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# Just browse the domain the user wants us to browse
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self.browse_domain(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC, domain)
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# def disconnect:
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# necessary ?
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# refresh data manually - really ok or too much traffic?
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def resolve_all(self):
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for key in contacts.keys():
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self.server.ResolveService( int(key.interface), int(key.protocol), key.name, \
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self.stype, key.domain, avahi.PROTO_UNSPEC, dbus.UInt32(0),\
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reply_handler=self.service_resolved_callback, error_handler=self.print_error_callback)
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def get_contacts(self):
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self.resolve_all
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return self.contacts
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def set_status(self, status):
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self.txt[('status')] = status
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txt = avahi.dict_to_txt_array(self.txt)
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self.entrygroup.UpdateServiceTxt(avahi.IF_UNSPEC, avahi.PROTO_UNSPEC, dbus.UInt32(0), self.name, self.stype,'', txt, reply_handler=self.service_updated_callback, error_handler=self.print_error_callback)
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# self.entrygroup.Commit() # TODO: necessary?
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def main():
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zeroconf = Zeroconf('foo')
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zeroconf.connect()
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zeroconf.txt[('last')] = 'foo'
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zeroconf.publish()
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zeroconf.set_status('avail')
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try:
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gobject.MainLoop().run()
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except KeyboardInterrupt, k:
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pass
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if __name__ == "__main__":
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main()
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