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# mainloop/sockserv.py -- socket server state machines
#
# Copyright 2012 Codethink Limited
# All rights reserved.
import logging
from sm import StateMachine
from socketsrc import NewConnection, SocketError, ListeningSocketEventSource
class ListenServer(StateMachine):
'''Listen for new connections on a port, send events for them.'''
def __init__(self, addr, port, machine, extra_args=None):
StateMachine.__init__(self, 'listening')
self._addr = addr
self._port = port
self._machine = machine
self._extra_args = extra_args or []
def setup(self):
src = ListeningSocketEventSource(self._addr, self._port)
self.mainloop.add_event_source(src)
spec = [
# state, source, event_class, new_state, callback
('listening', src, NewConnection, 'listening', self.new_conn),
('listening', src, SocketError, None, self.report_error),
]
self.add_transitions(spec)
def new_conn(self, event_source, event):
logging.debug(
'ListenServer: Creating new %s using %s and %s' %
(self._machine,
repr(event.connection),
repr(self._extra_args)))
m = self._machine(event.connection, *self._extra_args)
self.mainloop.add_state_machine(m)
def report_error(self, event_source, event):
logging.error(str(event))
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