def run_worker(context):
poller = Poller()
liveness = HEARTBEAT_LIVENESS
interval = INTERVAL_INIT
heartbeat_at = time.time() + HEARTBEAT_INTERVAL
worker = yield worker_socket(context, poller)
cycles = 0
while True:
socks = yield poller.poll(HEARTBEAT_INTERVAL * 1000)
socks = dict(socks)
# Handle worker activity on backend
if socks.get(worker) == zmq.POLLIN:
# Get message
# - 3-part envelope + content -> request
# - 1-part HEARTBEAT -> heartbeat
frames = yield worker.recv_multipart()
if not frames:
break # Interrupted
if len(frames) == 3:
# Simulate various problems, after a few cycles
cycles += 1
if cycles > 3 and randint(0, 5) == 0:
print("I: Simulating a crash")
break
if cycles > 3 and randint(0, 5) == 0:
print("I: Simulating CPU overload")
yield gen.sleep(3)
print("I: Normal reply")
yield worker.send_multipart(frames)
liveness = HEARTBEAT_LIVENESS
yield gen.sleep(1) # Do some heavy work
elif len(frames) == 1 and frames[0] == PPP_HEARTBEAT:
print("I: Queue heartbeat")
liveness = HEARTBEAT_LIVENESS
else:
print("E: Invalid message: %s" % frames)
interval = INTERVAL_INIT
else:
liveness -= 1
if liveness == 0:
print("W: Heartbeat failure, can't reach queue")
print("W: Reconnecting in %0.2fs..." % interval)
yield gen.sleep(interval)
if interval < INTERVAL_MAX:
interval *= 2
poller.unregister(worker)
worker.setsockopt(zmq.LINGER, 0)
worker.close()
worker = yield worker_socket(context, poller)
liveness = HEARTBEAT_LIVENESS
if time.time() > heartbeat_at:
heartbeat_at = time.time() + HEARTBEAT_INTERVAL
print("I: Worker heartbeat")
yield worker.send(PPP_HEARTBEAT)
def run():
subscriber = Ctx.socket(zmq.SUB)
subscriber.connect(Url)
subscription = b"%03d" % 5
subscriber.setsockopt(zmq.SUBSCRIBE, subscription)
poller = Poller()
poller.register(subscriber, zmq.POLLOUT)
while True:
topic, data = yield subscriber.recv_multipart()
#assert topic == subscription
print(data)
def run():
subscriber = Ctx.socket(zmq.SUB)
subscriber.connect(Url)
subscription = b"%03d" % 5
subscriber.setsockopt(zmq.SUBSCRIBE, subscription)
poller = Poller()
poller.register(subscriber, zmq.POLLOUT)
while True:
topic, data = yield subscriber.recv_multipart()
#assert topic == subscription
print(data)
def sender():
"""send a message every second"""
tic = time.time()
push = ctx.socket(zmq.PUSH)
push.bind(url)
poller = Poller()
poller.register(push, zmq.POLLOUT)
while True:
print("sending")
yield push.send_multipart([str(time.time() - tic).encode('ascii')])
yield gen.sleep(1)
def publisher(port=8135):
context = Context()
pub_uuid = str(uuid.uuid4())
pub = context.socket(zmq.PUB)
pub.connect("tcp://localhost:%s" % port)
poller = Poller()
poller.register(pub, zmq.POLLOUT)
while True:
topic = 'heartbeat'
utc = arrow.utcnow()
raw = json.dumps({"timestamp":utc.timestamp, "uuid": pub_uuid})
message = '{0} {1}'.format(topic, raw)
yield pub.send(message)
yield gen.sleep(1)
def receiver():
"""receive messages with poll and timeout"""
pull = ctx.socket(zmq.PULL)
pull.connect(url)
poller = Poller()
poller.register(pull, zmq.POLLIN)
while True:
events = yield poller.poll(timeout=500)
if pull in dict(events):
print("recving", events)
msg = yield pull.recv_multipart()
print('recvd', msg)
else:
print("nothing to recv")
def subscriber(port=8135):
'''
Bind Subscriber
'''
logging.warning("Binding SUB socket on port: {0}".format(port))
context = Context()
sub = context.socket(zmq.SUB)
sub.bind("tcp://*:%s" % port)
sub.setsockopt(zmq.SUBSCRIBE, " ")
sub.setsockopt(zmq.SUBSCRIBE, "heartbeat")
sub.setsockopt(zmq.SUBSCRIBE, "asterisk")
sub.setsockopt(zmq.SUBSCRIBE, "logging")
sub.setsockopt(zmq.SUBSCRIBE, "upload")
sub.setsockopt(zmq.SUBSCRIBE, "beam")
poller = Poller()
poller.register(sub, zmq.POLLIN)
http_client = _http_client.AsyncHTTPClient()
while True:
events = yield poller.poll(timeout=1000)
if sub in dict(events):
# receive raw msg from sub
msg = yield sub.recv()
# get topic and message
topic = msg.split(' ')[0]
message = ' '.join(msg.split(' ')[1:])
# this make more sense directly on the beam
# that why we're moving, still this sub_bind.py
# clear some ideas directly.
if topic.startswith('heartbeat'):
print(topic, message)
elif topic.startswith('asterisk'):
print(topic, message)
elif topic.startswith('logging'):
print(topic, message)
elif topic.startswith('upload'):
print(topic, message)
elif topic.startswith('beam'):
print(topic, message)
else:
# let it crash
logging.warning('let it crash')
print(msg)
else:
#logging.warning('nothing receive')
pass
def __init__(self,
url: str,
logger,
request_timeout: int = None,
database: str = None):
self._logger = logger
self._database = database
self._context = Context.instance()
self._poller = Poller()
self._request = self._context.socket(zmq.DEALER)
self._request_timeout = request_timeout or 60
self._rds_bus_url = url
self._request.connect(self._rds_bus_url)
self._request_dict = dict()
self._io_loop = ioloop.IOLoop.current()
self._io_loop.add_callback(self.start)
def run_queue(context):
frontend = context.socket(zmq.ROUTER) # ROUTER
backend = context.socket(zmq.ROUTER) # ROUTER
frontend.bind(FRONT_END_ADDRESS) # For clients
backend.bind(BACK_END_ADDRESS) # 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 = WorkerQueue()
heartbeat_at = time.time() + HEARTBEAT_INTERVAL
while True:
if len(workers.queue) > 0:
poller = poll_both
else:
poller = poll_workers
socks = yield poller.poll(HEARTBEAT_INTERVAL * 1000)
socks = dict(socks)
# Handle worker activity on backend
if socks.get(backend) == zmq.POLLIN:
# Use worker address for LRU routing
frames = yield backend.recv_multipart()
if not frames:
break
address = frames[0]
workers.ready(Worker(address))
# Validate control message, or return reply to client
msg = frames[1:]
if len(msg) == 1:
if msg[0] not in (PPP_READY, PPP_HEARTBEAT):
print("E: Invalid message from worker: %s" % msg)
else:
yield frontend.send_multipart(msg)
# Send heartbeats to idle workers if it's time
if time.time() >= heartbeat_at:
for worker in workers.queue:
msg = [worker, PPP_HEARTBEAT]
yield backend.send_multipart(msg)
heartbeat_at = time.time() + HEARTBEAT_INTERVAL
if socks.get(frontend) == zmq.POLLIN:
frames = yield frontend.recv_multipart()
if not frames:
break
frames.insert(0, next(workers))
backend.send_multipart(frames)
workers.purge()
def run_worker(context):
# Socket to receive messages on
receiver = context.socket(zmq.PULL)
receiver.connect("tcp://localhost:5557")
# Socket to send messages to
sender = context.socket(zmq.PUSH)
sender.connect("tcp://localhost:5558")
# Socket for control input
controller = context.socket(zmq.SUB)
controller.connect("tcp://localhost:5559")
controller.setsockopt(zmq.SUBSCRIBE, b"")
# Process messages from receiver and controller
poller = Poller()
poller.register(receiver, zmq.POLLIN)
poller.register(controller, zmq.POLLIN)
# Process messages from both sockets
while True:
socks = yield poller.poll()
socks = dict(socks)
if socks.get(receiver) == zmq.POLLIN:
message = yield receiver.recv()
# Process task
workload = int(message) # Workload in msecs
# Do the work
yield gen.sleep(workload / 1000.0)
# Send results to sink
yield sender.send(message)
# Simple progress indicator for the viewer
sys.stdout.write(".")
sys.stdout.flush()
# Any waiting controller command acts as 'KILL'
if socks.get(controller) == zmq.POLLIN:
break
def run():
print("Getting ready for hello world client. Ctrl-C to exit.\n")
socket = Ctx.socket(zmq.REP)
socket.bind(Url)
poller = Poller()
poller.register(socket, zmq.POLLIN)
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')
message = '{}, world'.format(message)
message = message.encode('utf-8')
print("Sending reply: {}".format(message))
yield socket.send(message)
def run():
print("Getting ready for hello world client. Ctrl-C to exit.\n")
socket = Ctx.socket(zmq.REP)
socket.bind(Url)
poller = Poller()
poller.register(socket, zmq.POLLIN)
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')
message = '{}, world'.format(message)
message = message.encode('utf-8')
print("Sending reply: {}".format(message))
yield socket.send(message)
def run(ident):
# Socket to talk to server
print("Connecting to hello world server. Ctrl-C to exit early.\n")
socket = Ctx.socket(zmq.REQ)
socket.connect(Url)
poller = Poller()
poller.register(socket, zmq.POLLOUT)
# Do multiple requests, waiting each time for a response
for request in range(10):
message = '{} Hello {}'.format(ident, request)
message = message.encode('utf-8')
print("Sending message: {}".format(message))
yield socket.send(message)
# Get the reply.
message = yield socket.recv()
print("Received reply: {}".format(message))
print('exiting')
raise gen.Return('nothing')
def run_worker():
print('(run_worker) worker is starting')
socket = Ctx.socket(zmq.DEALER)
socket.connect(Backend_Url)
poller = Poller()
poller.register(socket, zmq.POLLIN)
print('(run_worker) worker is waiting')
while True:
# Wait for next request from client
part1, part2, message = yield socket.recv_multipart()
print("(run_worker) received: {}".format(message))
# Do some 'work'
yield gen.sleep(1)
# Send reply back to client
message = message.decode('utf-8')
message = '{}, world'.format(message)
message = message.encode('utf-8')
print("(run_worker) sending: {}".format(message))
yield socket.send_multipart([part1, part2, message])
print("(run_worker) sent: {}".format(message))
def run_worker():
print('(run_worker) worker is starting')
socket = Ctx.socket(zmq.DEALER)
socket.connect(Backend_Url)
poller = Poller()
poller.register(socket, zmq.POLLIN)
print('(run_worker) worker is waiting')
while True:
# Wait for next request from client
part1, part2, message = yield socket.recv_multipart()
print("(run_worker) received: {}".format(message))
# Do some 'work'
yield gen.sleep(1)
# Send reply back to client
message = message.decode('utf-8')
message = '{}, world'.format(message)
message = message.encode('utf-8')
print("(run_worker) sending: {}".format(message))
yield socket.send_multipart([part1, part2, message])
print("(run_worker) sent: {}".format(message))
def run_client(context):
print("I: Connecting to server...")
client = context.socket(zmq.REQ)
client.connect(SERVER_ENDPOINT)
poll = Poller()
poll.register(client, zmq.POLLIN)
sequence = 0
retries_left = REQUEST_RETRIES
while retries_left:
sequence += 1
request = str(sequence)
print("I: Sending (%s)" % request)
yield client.send_string(request)
expect_reply = True
while expect_reply:
socks = yield poll.poll(REQUEST_TIMEOUT)
socks = dict(socks)
if socks.get(client) == zmq.POLLIN:
reply = yield client.recv()
if not reply:
break
if int(reply) == sequence:
print("I: Server replied OK (%s)" % reply)
retries_left = REQUEST_RETRIES
expect_reply = False
else:
print("E: Malformed reply from server: %s" % reply)
else:
print("W: No response from server, retrying...")
# Socket is confused. Close and remove it.
print('W: confused')
client.setsockopt(zmq.LINGER, 0)
client.unbind(SERVER_ENDPOINT)
#client.close()
poll.unregister(client)
retries_left -= 1
if retries_left == 0:
print("E: Server seems to be offline, abandoning")
return
print("I: Reconnecting and resending (%s)" % request)
# Create new connection
client = context.socket(zmq.REQ)
client.connect(SERVER_ENDPOINT)
poll.register(client, zmq.POLLIN)
yield client.send_string(request)
def run(loop):
"""Server routine"""
# Prepare our context and sockets
# Socket to talk to clients
clients = Ctx.socket(zmq.ROUTER)
clients.bind(Url_client)
workers = Ctx.socket(zmq.DEALER)
workers.bind(Url_worker)
# Start the workers
# Caution: Do *not* use lambda to create the function call to the worker.
# lambda does not work correctly inside a for-statement.
for idx in range(5):
ident = 'worker {}'.format(idx)
loop.add_callback(partial(worker_routine, ident))
poller = Poller()
poller.register(clients, zmq.POLLIN)
poller.register(workers, zmq.POLLIN)
print('mtserver ready for requests')
while True:
events = yield poller.poll()
events = dict(events)
if clients in events:
message = yield clients.recv_multipart()
printdbg('(run) received from client message_parts: {}'.format(
message))
client, empty, message = message[:3]
printdbg('(run) received from client message: {}'.format(
message))
yield workers.send_multipart([client, b'', message])
printdbg('(run) sent message to workers: {}'.format(message))
elif workers in events:
message = yield workers.recv_multipart()
printdbg('(run) received from worker message_parts: {}'.format(
message))
client, empty, message = message[:3]
printdbg('(run) received from worker message: {}'.format(
message))
yield clients.send_multipart([client, b'', message])
printdbg('(run) sent message to clients: {}'.format(message))
def run_queue(context):
frontend = context.socket(zmq.ROUTER) # ROUTER
backend = context.socket(zmq.ROUTER) # ROUTER
frontend.bind(FRONT_END_ADDRESS) # For clients
backend.bind(BACK_END_ADDRESS) # 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 = WorkerQueue()
heartbeat_at = time.time() + HEARTBEAT_INTERVAL
while True:
if len(workers.queue) > 0:
poller = poll_both
else:
poller = poll_workers
socks = yield poller.poll(HEARTBEAT_INTERVAL * 1000)
socks = dict(socks)
# Handle worker activity on backend
if socks.get(backend) == zmq.POLLIN:
# Use worker address for LRU routing
frames = yield backend.recv_multipart()
if not frames:
break
address = frames[0]
workers.ready(Worker(address))
# Validate control message, or return reply to client
msg = frames[1:]
if len(msg) == 1:
if msg[0] not in (PPP_READY, PPP_HEARTBEAT):
print("E: Invalid message from worker: %s" % msg)
else:
yield frontend.send_multipart(msg)
# Send heartbeats to idle workers if it's time
if time.time() >= heartbeat_at:
for worker in workers.queue:
msg = [worker, PPP_HEARTBEAT]
yield backend.send_multipart(msg)
heartbeat_at = time.time() + HEARTBEAT_INTERVAL
if socks.get(frontend) == zmq.POLLIN:
frames = yield frontend.recv_multipart()
if not frames:
break
frames.insert(0, next(workers))
backend.send_multipart(frames)
workers.purge()
def run(loop):
"""Server routine"""
# Prepare our context and sockets
# Socket to talk to clients
clients = Ctx.socket(zmq.ROUTER)
clients.bind(Url_client)
workers = Ctx.socket(zmq.DEALER)
workers.bind(Url_worker)
# Start the workers
# Caution: Do *not* use lambda to create the function call to the worker.
# lambda does not work correctly inside a for-statement.
for idx in range(5):
ident = 'worker {}'.format(idx)
loop.add_callback(partial(worker_routine, ident))
poller = Poller()
poller.register(clients, zmq.POLLIN)
poller.register(workers, zmq.POLLIN)
print('mtserver ready for requests')
while True:
events = yield poller.poll()
events = dict(events)
if clients in events:
message = yield clients.recv_multipart()
printdbg(
'(run) received from client message_parts: {}'.format(message))
client, empty, message = message[:3]
printdbg('(run) received from client message: {}'.format(message))
yield workers.send_multipart([client, b'', message])
printdbg('(run) sent message to workers: {}'.format(message))
elif workers in events:
message = yield workers.recv_multipart()
printdbg(
'(run) received from worker message_parts: {}'.format(message))
client, empty, message = message[:3]
printdbg('(run) received from worker message: {}'.format(message))
yield clients.send_multipart([client, b'', message])
printdbg('(run) sent message to clients: {}'.format(message))
def run_client(context):
print("I: Connecting to server...")
client = context.socket(zmq.REQ)
client.connect(SERVER_ENDPOINT)
poll = Poller()
poll.register(client, zmq.POLLIN)
sequence = 0
retries_left = REQUEST_RETRIES
while retries_left:
sequence += 1
request = str(sequence)
print("I: Sending (%s)" % request)
yield client.send_string(request)
expect_reply = True
while expect_reply:
socks = yield poll.poll(REQUEST_TIMEOUT)
socks = dict(socks)
if socks.get(client) == zmq.POLLIN:
reply = yield client.recv()
if not reply:
break
if int(reply) == sequence:
print("I: Server replied OK (%s)" % reply)
retries_left = REQUEST_RETRIES
expect_reply = False
else:
print("E: Malformed reply from server: %s" % reply)
else:
print("W: No response from server, retrying...")
# Socket is confused. Close and remove it.
print('W: confused')
client.setsockopt(zmq.LINGER, 0)
client.unbind(SERVER_ENDPOINT)
#client.close()
poll.unregister(client)
retries_left -= 1
if retries_left == 0:
print("E: Server seems to be offline, abandoning")
return
print("I: Reconnecting and resending (%s)" % request)
# Create new connection
client = context.socket(zmq.REQ)
client.connect(SERVER_ENDPOINT)
poll.register(client, zmq.POLLIN)
yield client.send_string(request)
def run_proxy(socket_from, socket_to):
poller = Poller()
poller.register(socket_from, zmq.POLLIN)
poller.register(socket_to, zmq.POLLIN)
while True:
events = yield poller.poll()
events = dict(events)
if socket_from in events:
msg = yield socket_from.recv_multipart()
print('(run_proxy) received from frontend -- msg: {}'.format(msg))
yield socket_to.send_multipart(msg)
print('(run_proxy) sent to backend -- msg: {}'.format(msg))
elif socket_to in events:
msg = yield socket_to.recv_multipart()
print('(run_proxy) received from backend -- msg: {}'.format(msg))
yield socket_from.send_multipart(msg)
print('(run_proxy) sent to frontend -- msg: {}'.format(msg))
def run_proxy(socket_from, socket_to):
poller = Poller()
poller.register(socket_from, zmq.POLLIN)
poller.register(socket_to, zmq.POLLIN)
while True:
events = yield poller.poll()
events = dict(events)
if socket_from in events:
msg = yield socket_from.recv_multipart()
print('(run_proxy) received from frontend -- msg: {}'.format(msg))
yield socket_to.send_multipart(msg)
print('(run_proxy) sent to backend -- msg: {}'.format(msg))
elif socket_to in events:
msg = yield socket_to.recv_multipart()
print('(run_proxy) received from backend -- msg: {}'.format(msg))
yield socket_from.send_multipart(msg)
print('(run_proxy) sent to frontend -- msg: {}'.format(msg))
def run_broker(context):
# Prepare our context and sockets
frontend = context.socket(zmq.ROUTER)
backend = context.socket(zmq.DEALER)
frontend.bind("tcp://*:5559")
backend.bind("tcp://*:5560")
# Initialize poll set
poller = Poller()
poller.register(frontend, zmq.POLLIN)
poller.register(backend, zmq.POLLIN)
# Switch messages between sockets
while True:
socks = yield poller.poll()
socks = dict(socks)
if socks.get(frontend) == zmq.POLLIN:
message = yield frontend.recv_multipart()
print('received from frontend: {}'.format(message))
yield backend.send_multipart(message)
if socks.get(backend) == zmq.POLLIN:
message = yield backend.recv_multipart()
print('received from backend: {}'.format(message))
yield frontend.send_multipart(message)
def run_broker(context):
# Prepare our context and sockets
frontend = context.socket(zmq.ROUTER)
backend = context.socket(zmq.DEALER)
frontend.bind("tcp://*:5559")
backend.bind("tcp://*:5560")
# Initialize poll set
poller = Poller()
poller.register(frontend, zmq.POLLIN)
poller.register(backend, zmq.POLLIN)
# Switch messages between sockets
while True:
socks = yield poller.poll()
socks = dict(socks)
if socks.get(frontend) == zmq.POLLIN:
message = yield frontend.recv_multipart()
print('received from frontend: {}'.format(message))
yield backend.send_multipart(message)
if socks.get(backend) == zmq.POLLIN:
message = yield backend.recv_multipart()
print('received from backend: {}'.format(message))
yield frontend.send_multipart(message)
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 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)
class TornadoRdsBusClient(object):
ASC = 1
DESC = -1
def __init__(self,
url: str,
logger,
request_timeout: int = None,
database: str = None):
self._logger = logger
self._database = database
self._context = Context.instance()
self._poller = Poller()
self._request = self._context.socket(zmq.DEALER)
self._request_timeout = request_timeout or 60
self._rds_bus_url = url
self._request.connect(self._rds_bus_url)
self._request_dict = dict()
self._io_loop = ioloop.IOLoop.current()
self._io_loop.add_callback(self.start)
@classmethod
def pack(cls,
database: str,
key: str,
parameter: dict,
is_query: bool = False,
order_by: list = None,
page_no: int = None,
per_page: int = None,
found_rows: bool = False):
"""
打包请求数据
:param database: RDS-BUS的数据库类名
:param key: 数据库类所持有的实例名
:param parameter: 参数字典
:param is_query: 是否为查询操作
:param order_by: 排序信息 [{"column": "字段名", "order": TornadoRdsBusClient.ASC/TornadoRdsBusClient.DESC}]
:param page_no: 当前页（范围[0-n) n指第n页）
:param per_page: 每页记录数
:param found_rows: 是否统计总数
:return:
"""
if is_query:
amount = int(per_page) if per_page else None
offset = int(page_no) * amount if page_no else None
limit = (dict(amount=amount, offset=offset) if offset else dict(
amount=amount)) if amount else None
result = dict(command="{}/{}".format(database, key),
data=dict(var=parameter,
order_by=order_by,
limit=limit,
found_rows=found_rows))
else:
result = dict(command="{}/{}".format(database, key),
data=dict(var=parameter))
return result
@gen.coroutine
def query(self,
key: str,
parameter: dict,
order_by: list = None,
page_no: int = None,
per_page: int = None,
found_rows: bool = False,
database: str = None,
execute: bool = True):
"""
查询接口
:param database: RDS-BUS的数据库类名
:param key: 数据库类所持有的语句实例名
:param parameter: 参数字典
:param order_by: 排序信息 [{"column": "字段名", "order": TornadoRdsBusClient.ASC/TornadoRdsBusClient.DESC}]
:param page_no: 当前页（范围[0-n) n指第n页）
:param per_page: 每页记录数
:param found_rows: 是否统计总数
:param execute: 是否执行
:return:
"""
_database = database or self._database
argument = self.pack(database=_database,
key=key,
parameter=parameter,
is_query=True,
order_by=order_by,
page_no=page_no,
per_page=per_page,
found_rows=found_rows)
if execute:
response = yield self._send(operation=OperationType.QUERY,
argument=argument)
result = RdsData(response)
else:
result = argument
return result
@gen.coroutine
def insert(self,
key: str,
parameter: dict,
database: str = None,
execute: bool = True):
"""
新增接口
:param database: RDS-BUS的数据库类名
:param key: 数据库类所持有的语句实例名
:param parameter: 参数字典
:param execute: 是否执行
:return:
"""
_database = database or self._database
argument = self.pack(database=_database, key=key, parameter=parameter)
if execute:
response = yield self._send(operation=OperationType.INSERT,
argument=argument)
result = RdsData(response)
else:
result = argument
return result
@gen.coroutine
def update(self,
key: str,
parameter: dict,
database: str = None,
execute: bool = True):
"""
更新接口
:param database: RDS-BUS的数据库类名
:param key: 数据库类所持有的语句实例名
:param parameter: 参数字典
:param execute: 是否执行
:return:
"""
_database = database or self._database
argument = self.pack(database=_database, key=key, parameter=parameter)
if execute:
response = yield self._send(operation=OperationType.UPDATE,
argument=argument)
result = RdsData(response)
else:
result = argument
return result
@gen.coroutine
def delete(self,
key: str,
parameter: dict,
database: str = None,
execute: bool = False):
"""
删除接口
:param database: RDS-BUS的数据库类名
:param key: 数据库类所持有的语句实例名
:param parameter: 参数字典
:param execute: 是否执行
:return:
"""
_database = database or self._database
argument = self.pack(database=_database, key=key, parameter=parameter)
if execute:
response = yield self._send(operation=OperationType.DELETE,
argument=argument)
result = RdsData(response)
else:
result = argument
return result
@gen.coroutine
def transaction(self, data: list, database: str = None):
"""
事务接口
:param database: RDS-BUS的数据库类名
:param data: 操作列表
:return:
"""
_database = database or self._database
result = yield self._send(
operation=OperationType.TRANSACTION,
argument=dict(command="{}/transaction".format(_database),
data=data))
return RdsListData(result)
@gen.coroutine
def batch(self, data: list, database: str = None):
"""
批量接口
:param database: RDS-BUS的数据库类名
:param data: 操作列表
:return:
"""
_database = database or self._database
result = yield self._send(operation=OperationType.BATCH,
argument=dict(
command="{}/batch".format(_database),
data=data))
return RdsListData(result)
@gen.coroutine
def start(self):
self._poller.register(self._request, zmq.POLLIN)
while True:
events = yield self._poller.poll()
if self._request in dict(events):
response = yield self._request.recv_json()
self._logger.debug("received {}".format(response))
if response["id"] in self._request_dict:
future = self._request_dict.pop(response["id"])
if HttpResult.is_duplicate_data_failure(response["code"]):
future.set_exception(
DuplicateDataException.new_exception(
response["desc"]))
elif HttpResult.is_failure(response["code"]):
future.set_exception(
CallServiceException(method="ZMQ",
url=self._rds_bus_url,
errmsg=response["desc"]))
else:
future.set_result(response["data"])
else:
self._logger.warning(
"unknown response {}".format(response))
def stop(self):
self._poller.unregister(self._request)
def shutdown(self):
self.stop()
self._request.close()
def _send(self, operation, argument):
"""
:param operation:
:param argument:
:return:
"""
request_id = get_unique_id()
self._request_dict[request_id] = Future()
self._io_loop.call_later(60, self._session_timeout, request_id)
self._request.send_multipart([
json.dumps(
dict(id=request_id,
operation=operation.value,
argument=argument)).encode("utf-8")
])
return self._request_dict[request_id]
def _session_timeout(self, request_id):
if request_id in self._request_dict:
future = self._request_dict.pop(request_id)
future.set_exception(
ServerTimeoutException(method="ZMQ", url=self._rds_bus_url))
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)