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"""GNUmed scripting listener.
This module implements threaded listening for scripting.
"""
#=====================================================================
# $Source: /home/ncq/Projekte/cvs2git/vcs-mirror/gnumed/gnumed/client/pycommon/gmScriptingListener.py,v $
__version__ = "$Revision: 1.7 $"
__author__ = "K.Hilbert <karsten.hilbert@gmx.net>"
import sys, time, threading, SimpleXMLRPCServer, select, logging
_log = logging.getLogger('gm.scripting')
_log.info(__version__)
#=====================================================================
class cScriptingListener:
# FIXME: this should use /var/run/gnumed/xml-rpc-port.pid
# FIXME: and store the current port there
"""This class handles how GNUmed listens for external requests.
It starts an XML-RPC server and forks a thread which
listens for incoming requests. Those requests are then
handed over to a macro executor and the results handed
back to the caller.
"""
def __init__(self, port = None, macro_executor = None, poll_interval = 3):
# listener thread will regularly try to acquire
# this lock, when it succeeds it will quit
self._quit_lock = threading.Lock()
if not self._quit_lock.acquire(0):
_log.error('cannot acquire thread quit lock !?! aborting')
import thread
raise thread.error("cannot acquire thread quit-lock")
# check for data every 'poll_interval' seconds
self._poll_interval = poll_interval
# localhost only for somewhat better security
self._listener_address = '127.0.0.1'
self._port = int(port)
self._macro_executor = macro_executor
self._server = SimpleXMLRPCServer.SimpleXMLRPCServer(addr=(self._listener_address, self._port), logRequests=False)
self._server.register_instance(self._macro_executor)
self._server.allow_reuse_address = True
self._thread = threading.Thread (
target = self._process_RPCs,
name = self.__class__.__name__
)
self._thread.setDaemon(True)
self._thread.start()
_log.info('scripting listener started on [%s:%s]' % (self._listener_address, self._port))
_log.info('macro executor: %s' % self._macro_executor)
_log.info('poll interval: %s seconds', self._poll_interval)
#-------------------------------
# public API
#-------------------------------
def shutdown(self):
"""Cleanly shut down. Complement to __init__()."""
if self._thread is None:
return
_log.info('stopping frontend scripting listener thread')
self._quit_lock.release()
try:
# give the worker thread time to terminate
self._thread.join(self._poll_interval+5)
try:
if self._thread.isAlive():
_log.error('listener thread still alive after join()')
_log.debug('active threads: %s' % threading.enumerate())
except:
pass
except:
print sys.exc_info()
self._thread = None
try:
self._server.socket.shutdown(2)
except:
_log.exception('cannot cleanly shutdown(5) scripting listener socket')
try:
self._server.socket.close()
except:
_log.exception('cannot cleanly close() scripting listener socket')
#-------------------------------
# internal helpers
#-------------------------------
def _process_RPCs(self):
"""The actual thread code."""
while 1:
if self._quit_lock.acquire(0):
break
time.sleep(0.35) # give others time to acquire lock
if self._quit_lock.acquire(0):
break
# wait at most self.__poll_interval for new data
ready_input_sockets = select.select([self._server.socket], [], [], self._poll_interval)[0]
# any input available ?
if len(ready_input_sockets) != 0:
# we may be in __del__ so we might fail here
try:
self._server.handle_request()
except:
print "cannot serve RPC"
break
if self._quit_lock.acquire(0):
break
time.sleep(0.25)
if self._quit_lock.acquire(0):
break
else:
time.sleep(0.35)
if self._quit_lock.acquire(0):
break
# exit thread activity
return
#=====================================================================
# main
#=====================================================================
if __name__ == "__main__":
#-------------------------------
class runner:
def tell_time(self):
return time.asctime()
#-------------------------------
if (len(sys.argv) > 1) and (sys.argv[1] == u'test'):
import xmlrpclib
try:
listener = cScriptingListener(macro_executor=runner(), port=9999)
except:
_log.exception('cannot instantiate scripting listener')
sys.exit(1)
s = xmlrpclib.ServerProxy('http://localhost:9999')
try:
t = s.tell_time()
print t
except:
_log.exception('cannot interact with server')
listener.shutdown()
#=====================================================================
# $Log: gmScriptingListener.py,v $
# Revision 1.7 2009-01-15 11:34:17 ncq
# - improved logging
#
# Revision 1.6 2008/06/23 21:49:58 ncq
# - clean up thread handling
#
# Revision 1.5 2007/12/12 16:17:16 ncq
# - better logger names
#
# Revision 1.4 2007/12/11 15:39:01 ncq
# - use std lib logging
#
# Revision 1.3 2007/12/03 20:43:53 ncq
# - lots of cleanup
# - fix/enhance test suite
#
# Revision 1.2 2004/09/13 08:51:03 ncq
# - make sure port is an integer
# - start XML RPC server with logRequests=False
# - socket allow_reuse_address
#
# Revision 1.1 2004/02/25 09:30:13 ncq
# - moved here from python-common
#
# Revision 1.3 2004/02/05 23:46:21 ncq
# - use serverproxy() instead of server() as is recommended
#
# Revision 1.2 2004/02/05 18:40:01 ncq
# - quit thread if we can't handle_request()
#
# Revision 1.1 2004/02/02 21:58:20 ncq
# - first cut
#
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