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Simple command-line tool for proxying ZMQ sockets
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import zmq | ||
import sys | ||
import argparse | ||
from datetime import datetime | ||
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def get_arguments(): | ||
ap = argparse.ArgumentParser(description="ZMQ Proxy tool") | ||
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def common_arguments(ap): | ||
ap.add_argument('--front-bind', metavar="ADDR", action='append', | ||
help="Binds frontend socket to specified address") | ||
ap.add_argument('--front-connect', metavar="ADDR", action='append', | ||
help="Connects frontend socket to specified address") | ||
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ap.add_argument('--back-bind', metavar="ADDR", action='append', | ||
help="Binds backend socket to specified address") | ||
ap.add_argument('--back-connect', metavar="ADDR", action='append', | ||
help="Connects backend socket to specified address") | ||
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ap.add_argument('--monitor-bind', metavar="ADDR", action='append', | ||
help="Creates and binds monitor socket" | ||
" to specified address") | ||
ap.add_argument('--monitor-connect', metavar="ADDR", action='append', | ||
help="Creates and connects monitor socket" | ||
" to specified address") | ||
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parsers = ap.add_subparsers( | ||
title="Commands", help="ZMQ Proxy tool commands") | ||
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sub = parsers.add_parser( | ||
'queue', | ||
help="Creates Shared Queue proxy" | ||
" (frontend/backend sockets are ZMQ_ROUTER/ZMQ_DEALER)") | ||
sub.set_defaults(sock_types=(zmq.ROUTER, zmq.DEALER), | ||
action=serve_proxy) | ||
common_arguments(sub) | ||
sub = parsers.add_parser( | ||
'forwarder', | ||
help="Creates Forwarder proxy" | ||
" (frontend/backend sockets are ZMQ_XSUB/ZMQ_XPUB)") | ||
sub.set_defaults(sock_types=(zmq.XSUB, zmq.XPUB), | ||
action=serve_proxy) | ||
common_arguments(sub) | ||
sub = parsers.add_parser( | ||
'streamer', | ||
help="Creates Streamer proxy" | ||
" (frontend/backend sockets are ZMQ_PULL/ZMQ_PUSH)") | ||
sub.set_defaults(sock_types=(zmq.PULL, zmq.PUSH), | ||
action=serve_proxy) | ||
common_arguments(sub) | ||
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sub = parsers.add_parser( | ||
'monitor', | ||
help="Connects/binds to monitor socket and dumps all traffic") | ||
sub.set_defaults(action=monitor) | ||
sub.add_argument('--connect', metavar="ADDR", | ||
help="Connect to monitor socket") | ||
sub.add_argument('--bind', metavar="ADDR", | ||
help="Bind monitor socket") | ||
return ap | ||
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def main(): | ||
ap = get_arguments() | ||
options = ap.parse_args() | ||
options.action(options) | ||
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def serve_proxy(options): | ||
if not (options.front_connect or options.front_bind): | ||
print("No frontend socket address specified!", file=sys.stderr) | ||
sys.exit(1) | ||
if not (options.back_connect or options.back_bind): | ||
print("No backend socket address specified!", file=sys.stderr) | ||
sys.exit(1) | ||
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ctx = zmq.Context().instance() | ||
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front_type, back_type = options.sock_types | ||
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front = ctx.socket(front_type) | ||
back = ctx.socket(back_type) | ||
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if options.monitor_bind or options.monitor_connect: | ||
monitor = ctx.socket(zmq.PUB) | ||
bind_connect(monitor, options.monitor_bind, options.monitor_connect) | ||
else: | ||
monitor = None | ||
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bind_connect(front, options.front_bind, options.front_connect) | ||
bind_connect(back, options.back_bind, options.back_connect) | ||
try: | ||
if monitor: | ||
zmq.proxy(front, back, monitor) | ||
else: | ||
zmq.proxy(front, back) | ||
except: | ||
return | ||
finally: | ||
front.close() | ||
back.close() | ||
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def bind_connect(sock, bind=None, connect=None): | ||
if bind: | ||
for address in bind: | ||
sock.bind(address) | ||
if connect: | ||
for address in connect: | ||
sock.connect(address) | ||
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def monitor(options): | ||
ctx = zmq.Context.instance() | ||
sock = ctx.socket(zmq.SUB) | ||
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bind = [options.bind] if options.bind else [] | ||
connect = [options.connect] if options.connect else [] | ||
bind_connect(sock, bind, connect) | ||
sock.setsockopt(zmq.SUBSCRIBE, b'') | ||
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try: | ||
while True: | ||
try: | ||
data = sock.recv() | ||
except KeyboardInterrupt: | ||
break | ||
except Exception as err: | ||
print("Error receiving message: {!r}".format(err)) | ||
else: | ||
print(datetime.now().isoformat(), | ||
"Message received: {!r}".format(data)) | ||
finally: | ||
sock.close() | ||
ctx.term() | ||
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if __name__ == "__main__": | ||
main() |
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