def socket():
"""Context manager to give the bound socket."""
ctx = Context()
sock = ctx.socket(zmq.PAIR)
sock.bind("tcp://*:8889")
yield sock
sock.close()
def run_worker():
context = Context(1)
worker = context.socket(zmq.REQ)
identity = "%04X-%04X" % (randint(0, 0x10000), randint(0, 0x10000))
worker.setsockopt_string(zmq.IDENTITY, identity)
worker.connect("tcp://localhost:5556")
print("I: (%s) worker ready" % identity)
yield worker.send_string(LRU_READY)
cycles = 0
while True:
msg = yield worker.recv_multipart()
if not msg:
break
cycles += 1
if cycles > 3 and randint(0, 5) == 0:
print("I: (%s) simulating a crash" % identity)
break
elif cycles > 3 and randint(0, 5) == 0:
print("I: (%s) simulating CPU overload" % identity)
yield gen.sleep(3)
print("I: (%s) normal reply" % identity)
# Do some heavy work
yield gen.sleep(1)
yield worker.send_multipart(msg)
async def open(self):
context = Context()
sock = context.socket(zmq.SUB)
sock.setsockopt(zmq.CONFLATE, 1)
sock.connect("tcp://localhost:{}".format(settings.ZMQ_PORT))
sock.subscribe(b'')
self.sock = sock
self._stopped = False
logger.debug("client connected: %s", self.request.remote_ip)
tornado.ioloop.IOLoop.current().spawn_callback(self.pipe_message)
def run(loop):
ctx = Context()
a, b = zpipe(ctx)
responses = yield [
client_task(ctx, b),
server_task(ctx),
monitor(a),
]
print('responses: {}'.format(responses))
del a, b
print('(run) finished')
def run_queue():
context = Context(1)
frontend = context.socket(zmq.ROUTER) # ROUTER
backend = context.socket(zmq.ROUTER) # ROUTER
frontend.bind("tcp://*:5555") # For clients
backend.bind("tcp://*:5556") # For workers
poll_workers = Poller()
poll_workers.register(backend, zmq.POLLIN)
poll_both = Poller()
poll_both.register(frontend, zmq.POLLIN)
poll_both.register(backend, zmq.POLLIN)
workers = []
while True:
if workers:
socks = yield poll_both.poll()
else:
socks = yield poll_workers.poll()
socks = dict(socks)
# Handle worker activity on backend
if socks.get(backend) == zmq.POLLIN:
# Use worker address for LRU routing
msg = yield backend.recv_multipart()
if not msg:
break
print('I: received msg: {}'.format(msg))
address = msg[0]
workers.append(address)
# Everything after the second (delimiter) frame is reply
reply = msg[2:]
# Forward message to client if it's not a READY
if reply[0] != LRU_READY:
print('I: sending -- reply: {}'.format(reply))
yield frontend.send_multipart(reply)
else:
print('I: received ready -- address: {}'.format(address))
if socks.get(frontend) == zmq.POLLIN:
# Get client request, route to first available worker
msg = yield frontend.recv_multipart()
worker = workers.pop(0)
request = [worker, b''] + msg
print('I: sending -- worker: {} msg: {}'.format(worker, msg))
yield backend.send_multipart(request)
def _start(self):
self.context = Context()
self.push = self.context.socket(zmq.PUSH)
log.debug("Connecting PUSH socket to %s", self.returner_address)
self.push.connect(self.returner_address)
minion_opts = self.opts.copy()
minion_opts["file_client"] = "local"
self.event = salt.utils.event.get_event(
"master", opts=minion_opts, io_loop=self.io_loop, listen=True
)
self.event.subscribe("")
self.event.set_event_handler(self.handle_event)
event_tag = "salt/master/{}/start".format(self.id)
log.info("Firing event on engine start. Tag: %s", event_tag)
load = {"id": self.id, "tag": event_tag, "data": {}}
self.event.fire_event(load, event_tag)
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
# Ensure the kernel we work with uses Futures on recv, so we can await them
self.future_context = ctx = Context()
# Our subscription to messages from the kernel we launch
self.iosub = ctx.socket(zmq.SUB)
self.iosub.subscribe = b""
# From kernelapp.py, shell_streams is typically shell_stream, control_stream
self.shell_stream = self.shell_streams[0]
# Start with no child kernel
self.child_kernel = None
self.kernel_config = None
self.acquiring_kernel = asyncio.Lock()
self.kernel_launched = asyncio.Event()
def run_server():
context = Context()
server = context.socket(zmq.REP)
server.bind(SERVER_ADDR)
cycles = 0
while True:
request = yield server.recv()
cycles += 1
# Simulate various problems, after a few cycles
if cycles > 3 and randint(0, 3) == 0:
print("I: Simulating a crash")
server.unbind(SERVER_ADDR)
# Delay for a bit, else we get "Address already in use" error.
# Note that to really simulate a crash, we should probably kill
# this process and start another.
yield gen.sleep(2)
break
elif cycles > 3 and randint(0, 3) == 0:
print("I: Simulating CPU overload")
yield gen.sleep(2)
print("I: Normal request (%s)" % request)
yield gen.sleep(1) # Do some heavy work
yield server.send(request)
raise gen.Return((context, server))
async def run(loop):
context = Context()
while True:
await run_server(context)
def run(loop):
context = Context()
yield run_worker(context)
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.future_context = ctx = Context()
self.iosub = ctx.socket(zmq.SUB)
self.iosub.subscribe = b''
self.shell_stream = self.shell_streams[0]
def run(loop):
context = Context()
yield run_broker(context)
async def run(loop, zip_filter):
context = Context()
await run_client(context, zip_filter)
def run(loop, ident, num_workers):
context = Context()
yield run_worker_parallel(context, ident, num_workers)
def run(loop):
context = Context()
server = Server(loop, context)
yield server.run_server()
printdbg('(run) finished')
def run(loop):
context = Context()
while True:
yield run_queue(context)
def run(loop):
context = Context(1)
while True:
yield run_worker(context)
def run(loop, zipcodes):
context = Context()
yield run_client_parallel(context, zipcodes)
def run(loop):
context = Context()
yield run_sink(context)
Hello World server in Python.
Binds REP socket to Url.
Expects b"Hello" from client, replies with b"World".
Modified for tornado/ioloop: Dave Kuhlman <dkuhlman(at)davekuhlman(dot)org>
usage:
python hwserver.py
"""
import sys
import zmq
from zmq.eventloop.future import Context
from zmq.eventloop.ioloop import IOLoop
from tornado import gen
Url = 'tcp://127.0.0.1:5555'
Ctx = Context()
@gen.coroutine
def run():
print("Getting ready for hello world client. Ctrl-C to exit.\n")
socket = Ctx.socket(zmq.REP)
socket.bind(Url)
while True:
# Wait for next request from client
message = yield socket.recv()
print("Received request: {}".format(message))
# Do some 'work'
yield gen.sleep(1)
# Send reply back to client
message = message.decode('utf-8')
async def run(loop, zipcodes):
context = Context()
await run_client_parallel(context, zipcodes)
def run(host, port):
context = Context()
yield zstreams.run_producer(context, host, port - 3)
def run_broker(loop):
""" main broker method """
url_worker = "inproc://workers"
url_client = "inproc://clients"
client_nbr = NBR_CLIENTS * 3
# Prepare our context and sockets
context = Context()
frontend = context.socket(zmq.ROUTER)
frontend.bind(url_client)
backend = context.socket(zmq.ROUTER)
backend.bind(url_worker)
# create workers and clients threads
#worker_tasks = []
for idx in range(NBR_WORKERS):
loop.add_callback(partial(run_worker, url_worker, context, idx))
#worker_tasks.append(task)
#client_tasks = []
for idx in range(NBR_CLIENTS):
loop.add_callback(partial(run_client, url_client, context, idx))
#client_tasks.append(task)
# Logic of LRU loop
# - Poll backend always, frontend only if 1+ worker ready
# - If worker replies, queue worker as ready and forward reply
# to client if necessary
# - If client requests, pop next worker and send request to it
# Queue of available workers
available_workers = 0
workers_list = []
all_workers = set()
# init poller
poller = Poller()
# Always poll for worker activity on backend
poller.register(backend, zmq.POLLIN)
# Poll front-end only if we have available workers
poller.register(frontend, zmq.POLLIN)
while True:
socks = yield poller.poll()
socks = dict(socks)
# Handle worker activity on backend
if (backend in socks and socks[backend] == zmq.POLLIN):
# Queue worker address for LRU routing
message = yield backend.recv_multipart()
assert available_workers < NBR_WORKERS
worker_addr = message[0]
# add worker back to the list of workers
available_workers += 1
workers_list.append(worker_addr)
all_workers.add(worker_addr)
# Second frame is empty
empty = message[1]
assert empty == b""
# Third frame is READY or else a client reply address
client_addr = message[2]
# If client reply, send rest back to frontend
if client_addr != b'READY':
# Following frame is empty
empty = message[3]
assert empty == b""
reply = message[4]
yield frontend.send_multipart([client_addr, b"", reply])
printdbg('(run_broker) to frontend -- reply: "{}"'.format(
reply))
client_nbr -= 1
if client_nbr == 0:
printdbg('(run_broker) exiting')
break # Exit after N messages
# poll on frontend only if workers are available
if available_workers > 0:
if (frontend in socks and socks[frontend] == zmq.POLLIN):
# Now get next client request, route to LRU worker
# Client request is [address][empty][request]
response = yield frontend.recv_multipart()
[client_addr, empty, request] = response
assert empty == b""
# Dequeue and drop the next worker address
available_workers += -1
worker_id = workers_list.pop()
yield backend.send_multipart(
[worker_id, b"", client_addr, b"", request])
printdbg('(run_broker) to backend -- request: "{}"'.format(
request))
#out of infinite loop: do some housekeeping
printdbg('(run_broker) finishing')
for worker_id in workers_list:
yield backend.send_multipart([worker_id, b"", b"", b"", b"Stop"])
printdbg('(run_broker) workers cancelled')
yield gen.sleep(1)
frontend.close()
backend.close()
#context.term() # Caution: calling term() blocks.
printdbg('(run_broker) returning')
result = 'finished ok'
raise gen.Return(result)
def run(loop):
context = Context()
yield run_ventilator(context)
def run(loop):
context = Context()
while True:
yield run_client(context)
