def main():
verbose = '-v' in sys.argv
ctx = zmq.Context()
# Create MDP client session with short timeout
client = MajorDomoClient("tcp://localhost:5555", verbose)
client.timeout = 1000 # 1 sec
client.retries = 1 # only 1 retry
request_pipe, peer = zpipe(ctx)
request_thread = threading.Thread(target=titanic_request, args=(peer,))
request_thread.daemon = True
request_thread.start()
reply_thread = threading.Thread(target=titanic_reply)
reply_thread.daemon = True
reply_thread.start()
close_thread = threading.Thread(target=titanic_close)
close_thread.daemon = True
close_thread.start()
poller = zmq.Poller()
poller.register(request_pipe, zmq.POLLIN)
# Main dispatcher loop
while True:
# Ensure message directory exists
if not os.path.exists(TITANIC_DIR):
os.mkdir(TITANIC_DIR)
# We'll dispatch once per second, if there's no activity
try:
items = poller.poll(1000)
except KeyboardInterrupt:
break
if items:
# Append UUID to queue, prefixed with '-' for pending
uuid = request_pipe.recv()
with open(os.path.join(TITANIC_DIR, 'queue'), 'a') as f:
f.write("-%s\n" % uuid)
# Brute force dispatcher
with open(os.path.join(TITANIC_DIR, 'queue'), 'r+b') as f:
for entry in f.readlines():
# UUID is prefixed with '-' if still waiting
if entry[0] == '-':
uuid = entry[1:].rstrip() # rstrip '\n' etc.
print("I: processing request %s" % uuid)
if service_success(client, uuid):
# mark queue entry as processed
here = f.tell()
f.seek(-1*len(entry), os.SEEK_CUR)
f.write("+")
f.seek(here, os.SEEK_SET)
def test_zpipe(self, ctx):
"""Test zpipe method
Setting up two inproc PAIRs for threading
"""
s1, s2 = zpipe(ctx)
# check high water mark setting
assert s1.get_hwm() == 1
assert s2.get_hwm() == 1
# check linger setting
assert s1.get(zmq.LINGER) == 0
assert s2.get(zmq.LINGER) == 0
# check sending message between pair
msg = [b'', b'hello']
s1.send_multipart(msg)
resp = s2.recv_multipart()
assert msg == resp