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# Copyright (C) 2010 Aldo Cortesi
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import sys
import Queue, threading
#begin nocover
class Msg:
def __init__(self):
self.q = Queue.Queue()
self.acked = False
def ack(self, data=None):
self.acked = True
self.q.put(data or self)
def send(self, masterq):
self.acked = False
masterq.put(self)
return self.q.get()
class Slave(threading.Thread):
def __init__(self, masterq, server):
self.masterq, self.server = masterq, server
self.server.set_mqueue(masterq)
threading.Thread.__init__(self)
def run(self):
self.server.serve_forever()
class Master:
def __init__(self, server):
self.server = server
self._shutdown = False
self.masterq = None
def tick(self, q):
try:
# This endless loop is running until the 'Queue.Empty'
# exception is thrown. If more than one request is in
# the queue, this speeds up every request by 0.1 seconds,
# because get_input(..) function is not blocking.
while True:
# Small timeout to prevent pegging the CPU
msg = q.get(timeout=0.01)
self.handle(msg)
except Queue.Empty:
pass
def run(self):
q = Queue.Queue()
self.masterq = q
slave = Slave(q, self.server)
slave.start()
while not self._shutdown:
self.tick(q)
self.shutdown()
def handle(self, msg):
c = "handle_" + msg.__class__.__name__.lower()
m = getattr(self, c, None)
if m:
m(msg)
else:
msg.ack()
def shutdown(self):
if not self._shutdown:
self._shutdown = True
self.server.shutdown()
class DumpMaster(Master):
"""
A simple master that just dumps to screen.
"""
def __init__(self, server, verbosity):
self.verbosity = verbosity
Master.__init__(self, server)
def run(self):
try:
return Master.run(self)
except KeyboardInterrupt:
self.shutdown()
def handle_response(self, msg):
if 0 < self.verbosity < 3:
print >> sys.stderr, ">>",
print >> sys.stderr, msg.request.short()
if self.verbosity == 1:
print >> sys.stderr, "<<",
print >> sys.stderr, msg.short()
elif self.verbosity == 2:
print >> sys.stderr, "<<"
for i in msg.assemble().splitlines():
print >> sys.stderr, "\t", i
print >> sys.stderr, "<<"
elif self.verbosity == 3:
print >> sys.stderr, ">>"
for i in msg.request.assemble().splitlines():
print >> sys.stderr, "\t", i
print >> sys.stderr, ">>"
print >> sys.stderr, "<<"
for i in msg.assemble().splitlines():
print >> sys.stderr, "\t", i
print >> sys.stderr, "<<"
msg.ack()
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