Why is this zmq code not working? - python

This test doesn't work.
class PrintHandler(MessageHandler):
def handle_message(self, message):
print(message)
class FileHandler(MessageHandler):
def handle_message(self, message):
with open('nana', 'w') as f:
f.write(message)
class SubscribeProcess(Process):
def __init__(self, handler):
super(SubscribeProcess, self).__init__(group=None, target=None, name=None, args=(), kwargs={})
self.handler = handler
def run(self):
self.address = TcpAddress(host='127.0.0.1', port=5555)
subscriber = ZmqSubscriber(ZmqBlockingConnection(address=self.address, bind=False))
subscriber.set_message_handler(self.handler)
print('............')
class TestZmqSubscriber(TestCase):
def test_set_message_handler(self):
address = TcpAddress(host='127.0.0.1', port=5555)
pub_connection = ZmqBlockingConnection(address, bind=True)
publisher = ZmqPublisher(pub_connection)
p = SubscribeProcess(handler=PrintHandler())
p.start()
while True:
publisher.publish('Message number {}'.format(2))
I now that's this is not the unit test actually. But I want to see the received messages in console first. Then I will write proper test.
While this two scripts work perfectly.
connection = ZmqBlockingConnection(TcpAddress(host='127.0.0.1', port=5555), bind=False)
sub = ZmqSubscriber(connection)
sub.set_message_handler(PrintHandler())
address = TcpAddress(host='127.0.0.1', port=5555)
pub_connection = ZmqBlockingConnection(address, bind=True)
publisher = ZmqPublisher(pub_connection)
while True:
publisher.publish('Message number {}'.format(2))
Inside of subscriber.set_message_handler(handler) is actually this
def start_receiving_messages(self, message_handler):
while True:
message_handler.handle_message(self.socket.recv())
And in debugger I see that the code hangs infinitely in socket.recv()
Maybe I'm using multiprocessing wrong?
EDIT1
class ZmqBlockingConnection(Connection):
def start_receiving_messages(self, message_handler):
while True:
message_handler.handle_message(self.socket.recv())
def send_message(self, message):
self.socket.send(message)
def __init__(self, address, bind, hwm=1000):
self.hwm = hwm
self.bind = bind
self.address = address
self.socket = None
def set_hwm(self, hwm):
self.socket.set_hwm(hwm)
def configure(self, socket_type):
self.socket = zmq.Context().socket(socket_type)
if self.bind:
self.socket.bind(str(self.address))
else:
self.socket.connect(str(self.address))
self.set_hwm(self.hwm)

OK, the problem was in
def configure(self, socket_type):
self.socket = zmq.Context().instance().socket(socket_type)
if self.bind:
self.socket.bind(str(self.address))
else:
self.socket.connect(str(self.address))
self.set_hwm(self.hwm)
so instead of using singleton I started to create context instances and now it's working.

Related

Python3 asyncio - callback for add_done_callback do not updates self variable in server class

I have two servers, created with asyncio.start_server:
asyncio.start_server(self.handle_connection, host = host, port = port) and running in one loop:
loop.run_until_complete(asyncio.gather(server1, server2))
loop.run_forever()
I'm using asyncio.Queue to communicate between servers. Messages from Server2, added via queue.put(msg) successfully receives by queue.get() in Server1. I'm running queue.get() by asyncio.ensure_future and using as callback for
add_done_callback method from Server1:
def callback(self, future):
msg = future.result()
self.msg = msg
But this callback not working as expected - self.msg do not updates. What am I doing wrong?
UPDATED
with additional code to show max full example:
class Queue(object):
def __init__(self, loop, maxsize: int):
self.instance = asyncio.Queue(loop = loop, maxsize = maxsize)
async def put(self, data):
await self.instance.put(data)
async def get(self):
data = await self.instance.get()
self.instance.task_done()
return data
#staticmethod
def get_instance():
return Queue(loop = asyncio.get_event_loop(), maxsize = 10)
Server class:
class BaseServer(object):
def __init__(self, host, port):
self.instance = asyncio.start_server(self.handle_connection, host = host, port = port)
async def handle_connection(self, reader: StreamReader, writer: StreamWriter):
pass
def get_instance(self):
return self.instance
#staticmethod
def create():
return BaseServer(None, None)
Next I'm running the servers:
loop.run_until_complete(asyncio.gather(server1.get_instance(), server2.get_instance()))
loop.run_forever()
In the handle_connection of server2 I'm calling queue.put(msg), in the handle_connection of server1 I'm registered queue.get() as task:
task_queue = asyncio.ensure_future(queue.get())
task_queue.add_done_callback(self.process_queue)
The process_queue method of server1:
def process_queue(self, future):
msg = future.result()
self.msg = msg
The handle_connection method of server1:
async def handle_connection(self, reader: StreamReader, writer: StreamWriter):
task_queue = asyncio.ensure_future(queue.get())
task_queue.add_done_callback(self.process_queue)
while self.msg != SPECIAL_VALUE:
# doing something
Although task_queue is done, self.process_queue called, self.msg never updates.
Basically as you are using asynchronous structure, I think you can directly await the result:
async def handle_connection(self, reader: StreamReader, writer: StreamWriter):
msg = await queue.get()
process_queue(msg) # change it to accept real value instead of a future.
# do something

How to get client connection object in tornado websocket, Python

I am using tornado websocket for simple test code.
In the test code, i want to get tornado.websocket.WebSocketHandler.
For example, I used this way below.
class ConvPlayerInterface(object):
class WebsocketHandler(tornado.websocket.WebSocketHandler):
client = None
queue = ipcQueue.IpcQueue()
def open(self):
print 'new connection'
self.client = self #in my simple code, it handles only one client.
self.write_message("Connection Open")
def on_message(self, message):
self.queue.put(message)
def on_close(self):
print 'connection closed'
def __init__(self, url='/ws'):
self.application = tornado.web.Application([(url, self.WebsocketHandler),])
self.httpServer = tornado.httpserver.HTTPServer(self.application)
self.httpServer.listen(8888)
self.queue = self.WebsocketHandler.queue
self.ioLoop = threading.Thread(target = tornado.ioloop.IOLoop.instance().start)
def start(self):
self.ioLoop.start()
def get(self):
return self.queue.get()
def put(self, command):
self.WebsocketHandler.client.write_message(command)
But the point when it calls self.WebsocketHandler.client.write_message(command) in put() method, Python says client is Non type.
Any advice?
And how usually it is used to get client connection handler object in tornado?
In this part of your code
def put(self, command):
self.WebsocketHandler.client.write_message(command)
you are accessing to WebsocketHandler class, not a class member.
And the "client" attribute of WebsocketHandler is None, as expected.
WebsocketHandler instance will be created for each request tornado will accept, so there can be several websocket handlers simultaneously.
If you really want to have handle only one connection - you can do something like this:
class ConvPlayerInterface(object):
the_only_handler = None
class WebsocketHandler(tornado.websocket.WebSocketHandler):
client = None
queue = ipcQueue.IpcQueue()
def open(self):
print 'new connection'
ConvPlayerInterface.the_only_handler = self
self.write_message("Connection Open")
def on_message(self, message):
self.queue.put(message)
def on_close(self):
ConvPlayerInterface.the_only_handler = None
print 'connection closed'
def __init__(self, url='/ws'):
self.application = tornado.web.Application([(url, self.WebsocketHandler),])
self.httpServer = tornado.httpserver.HTTPServer(self.application)
self.httpServer.listen(8888)
self.queue = self.WebsocketHandler.queue
self.ioLoop = threading.Thread(target = tornado.ioloop.IOLoop.instance().start)
def start(self):
self.ioLoop.start()
def get(self):
return self.queue.get()
def put(self, command):
if self.the_only_handler is not None
self.the_only_handler.write_message(command)

How to use ioloops with multithreading in python?

I have problem figuring out how to use zmq with ioloops and multithreading. Whatever I'm doing I have some exceptions.
__author__ = 'michael'
class ZmqLoopRunner(Thread):
def __init__(self, callback):
super(ZmqLoopRunner, self).__init__()
self.loop = IOLoop.current()
self.callback = callback
def run(self):
self.loop.start()
print('loop have been stopped')
self.callback()
def stop(self):
self.loop.stop()
class BaseZmqNode():
__metaclass__ = ABCMeta
def __init__(self, host, port, bind, hwm):
self.node = self.create_node()
self.node.host = host
self.port = port
self.context = zmq.Context().instance()
self.socket = self.create_socket()
if bind:
self.socket.bind(self.build_address(host, port))
else:
self.socket.connect(self.build_address(host, port))
self.set_hwm(hwm)
def set_hwm(self, hwm):
self.socket.set_hwm(hwm)
def send_multipart(self, message):
self.socket.send_multipart(message)
def send_json(self, json):
self.socket.send_json(json)
def create_node(self):
return BaseMessagingNode
def close(self):
self.socket.close()
#staticmethod
def build_address(host, port):
strings = [host, ':', str(port)]
return ''.join(strings)
#abstractmethod
def create_socket(self):
pass
class BaseZmqReceiver(BaseZmqNode):
__metaclass__ = ABCMeta
def __init__(self, host, port, hwm, bind, on_receive_callback):
super(BaseZmqReceiver, self).__init__(host=host, port=port, bind=bind, hwm=hwm)
self.node.on_message_callback = on_receive_callback
self.stream = ZMQStream(self.socket)
self.stream.on_recv(self.on_message_received)
self.runner = ZmqLoopRunner(self.stream.close)
self.runner.start()
def on_message_received(self, message):
return self.node.on_message_callback(message)
def create_node(self):
return ReceivingNode(None, None)
def close(self):
# super(BaseZmqReceiver, self).close()
self.runner.stop()
# self.socket.close()
Here is how my code looks right now. I have exceptions in test 'Address already in use' when running my tests.
Here is stacktrace
Traceback (most recent call last):
File "/opt/leos/code/messaging_system/tests/ZmqTest.py", line 51, in test_send_json
publisher = ZmqPublisher('tcp://*', 6000)
File "/opt/leos/code/messaging_system/zeromq/ZmqPublisher.py", line 11, in __init__
super(ZmqPublisher, self).__init__(host=host, port=port, bind=bind, hwm=hwm)
File "/opt/leos/code/messaging_system/zeromq/BaseZmqNode.py", line 18, in __init__
self.socket.bind(self.build_address(host, port))
File "socket.pyx", line 434, in zmq.backend.cython.socket.Socket.bind (zmq/backend/cython/socket.c:3928)
File "checkrc.pxd", line 21, in zmq.backend.cython.checkrc._check_rc (zmq/backend/cython/socket.c:6058)
ZMQError: Address already in use
class ZmqTest(AbstractMessagingTest):
def setUp(self):
super(ZmqTest, self).setUp()
self.multipart_messages = self.create_multipart_messages(10)
def tearDown(self):
super(ZmqTest, self).tearDown()
def test_request_reply(self):
requester = ZmqReq(host='tcp://localhost', port=6000)
self.request = 'Hello'
self.reply = 'World!'
replier = ZmqRep(host='tcp://*', port=6000, request_processor=self.on_request_received)
self.assertEqual(self.reply, requester.execute(request=self.request))
# requester.close()
replier.close()
requester.close()
def test_address_creation(self):
full_address = "tcp://localhost:5559"
self.assertEqual(full_address, ZmqSubscriber.build_address("tcp://localhost", 5559))
self.assertEqual('tcp://*:6000', ZmqPublisher.build_address("tcp://*", 6000))
def test_publisher_subscriber(self):
publisher = ZmqPublisher('tcp://*', 6000)
subscriber = ZmqSubscriber('tcp://localhost', 6000, self.handle_message)
self.send_messages(publisher, wait=False)
sleep(0.5)
self.assertSequenceEqual(self.test_messages, self.received_messages)
publisher.close()
subscriber.close()
def handle_message(self, message):
self.base_handle_message(message[0])
def test_send_json(self):
publisher = ZmqPublisher('tcp://*', 6000)
subscriber = ZmqSubscriber('tcp://localhost', 6000, self.handle_json_message)
md = {'1' : 1}
publisher.send_json(md)
publisher.close()
subscriber.close()
def create_multipart_messages(self, size):
messages = []
for i in range(size):
messages.append(['Multipart test message', str(i)])
return messages
def send_multipart_messages(self, sender):
for message in self.multipart_messages:
sender.send_multipart(message)
def test_multipart_messages(self):
publisher = ZmqPublisher('tcp://*', 6000)
subscriber = ZmqSubscriber('tcp://localhost', 6000, self.base_handle_message)
self.send_multipart_messages(publisher)
sleep(0.5)
self.assertSequenceEqual(self.multipart_messages, self.received_messages)
publisher.close()
subscriber.close()
def test_push_pull_multipart(self):
ventilator = ZmqPush('tcp://*', 6000)
worker = ZmqPull('tcp://localhost', 6000, self.base_handle_message)
self.send_multipart_messages(ventilator)
sleep(0.5)
self.assertSequenceEqual(self.multipart_messages, self.received_messages)
ventilator.close()
worker.close()
def handle_json_message(self, json):
print(str(json))
def test_push_pull(self):
ventilator = ZmqPush('tcp://*', 6000)
worker = ZmqPull('tcp://localhost', 6000, self.handle_message)
self.send_messages(ventilator, wait=False)
sleep(0.5)
self.assertSequenceEqual(self.test_messages, self.received_messages)
ventilator.close()
worker.close()
def on_request_received(self, message):
if message[0] == self.request:
return self.reply
else:
return 'ERROR'
And I've tried many variants of this code. Like as you can see right now I'm trying to close the stream after the loop.start() method returned. I've tried to close the stream after the stop method and it just don't work.
So you're getting the error that the socket address is already open. This is probably because you have run up the program, an exception was thrown and you haven't closed down the socket.
I'd suggest some try, except and finally blocks:
try:
requester = ZmqReq(host='tcp://localhost', port=6000)
self.request = 'Hello'
self.reply = 'World!'
replier = ZmqRep(host='tcp://*', port=6000, request_processor=self.on_request_received)
self.assertEqual(self.reply, requester.execute(request=self.request))
except Exception as e:
# You can catch exceptions here
pass
finally:
# Once the code completes or exceptions are thrown, clean up
replier.close()
requester.close()

Receiving zmq message with error every one hour

I should say, that before I've started to use zmq reactor instead of poller everything worked fine.
class BaseZmqReceiver(BaseZmqNode):
__metaclass__ = ABCMeta
def __init__(self, host, port, hwm, bind, on_receive_callback):
super(BaseZmqReceiver, self).__init__(host=host, port=port, bind=bind, hwm=hwm)
self.node.on_message_callback = on_receive_callback
self.stream = ZMQStream(self.socket)
self.stream.on_recv(self.on_message_received)
ZmqLoopRunner().start()
def on_message_received(self, message):
return self.node.on_message_callback(message)
def create_node(self):
return ReceivingNode(None, None)
class ZmqLoopRunner(Thread):
def __init__(self):
super(ZmqLoopRunner, self).__init__()
self.loop = IOLoop.instance()
self.daemon = True
def run(self):
self.loop.start()
def stop(self):
self.loop.stop()
class ZmqSubscriber(BaseZmqReceiver):
def __init__(self, host, port, on_receive_callback, bind=False, hwm=1000):
super(ZmqSubscriber, self).__init__(host=host, port=port, hwm=hwm, bind=bind,
on_receive_callback=on_receive_callback)
def create_socket(self):
socket = self.context.socket(zmq.SUB)
socket.setsockopt(zmq.SUBSCRIBE, "")
return socket
Here is my zmq code.
And I'm basically just receiving multipart message in callback.
def on_message(message):
part1, part2 = message
And every one hour I've got message that consist of only one part. So I got
TypeError: need more than one value to unpack.
EDIT here is my full zmq code.
https://drive.google.com/file/d/0B7jQezPDaLZFQWxBMUdXQkxnS1k/edit?usp=sharing

Python, Call a class function from another class

Can you anyone please help me (noob) call the broadcast function from class BroadcastServerFactory in class process, as per attached code
I have tried so many methods of call a function from another class, but no solution
import time, sys
from apscheduler.scheduler import Scheduler
import threading
import socket
from twisted.internet import reactor
from twisted.python import log
from twisted.web.server import Site
from twisted.web.static import File
from autobahn.websocket import WebSocketServerFactory, \
WebSocketServerProtocol, \
listenWS
class process(threading.Thread):
def __init__(self, buffer3):
threading.Thread.__init__(self)
self.setDaemon(True)
self.buffer3 = buffer3
def run(self):
factory.broadcast("I don't know what I'm doing!")
class BroadcastServerProtocol(WebSocketServerProtocol):
def onOpen(self):
self.factory.register(self)
def onMessage(self, msg, binary):
if not binary:
self.factory.broadcast("'%s' from %s" % (msg, self.peerstr))
def connectionLost(self, reason):
WebSocketServerProtocol.connectionLost(self, reason)
self.factory.unregister(self)
class BroadcastServerFactory(WebSocketServerFactory):
"""
Simple broadcast server broadcasting any message it receives to all
currently connected clients.
"""
def __init__(self, url, debug = False, debugCodePaths = False):
WebSocketServerFactory.__init__(self, url, debug = debug, debugCodePaths = debugCodePaths)
self.clients = []
self.tickcount = 0
self.tick()
def tick(self):
self.tickcount += 1
self.broadcast("'tick %d' from server" % self.tickcount)
reactor.callLater(1, self.tick)
def register(self, client):
if not client in self.clients:
print "registered client " + client.peerstr
self.clients.append(client)
def unregister(self, client):
if client in self.clients:
print "unregistered client " + client.peerstr
self.clients.remove(client)
def broadcast(self, msg):
print "broadcasting message '%s' .." % msg
for c in self.clients:
c.sendMessage(msg)
print "message sent to " + c.peerstr
class BroadcastPreparedServerFactory(BroadcastServerFactory):
"""
Functionally same as above, but optimized broadcast using
prepareMessage and sendPreparedMessage.
"""
def broadcast(self, msg):
print "broadcasting prepared message '%s' .." % msg
preparedMsg = self.prepareMessage(msg)
for c in self.clients:
c.sendPreparedMessage(preparedMsg)
print "prepared message sent to " + c.peerstr
def testing():
buffer2 - "hello"
myDisplay = process(buffer2)
myDisplay.start()
if __name__ == '__main__':
if len(sys.argv) > 1 and sys.argv[1] == 'debug':
log.startLogging(sys.stdout)
debug = True
else:
debug = False
level_scheduler = Scheduler()
level_scheduler.add_interval_job(testing, seconds=5)
level_scheduler.start()
#ServerFactory = BroadcastServerFactory
ServerFactory = BroadcastPreparedServerFactory
factory = ServerFactory("ws://localhost:9000",
debug = debug,
debugCodePaths = debug)
factory.protocol = BroadcastServerProtocol
factory.setProtocolOptions(allowHixie76 = True)
listenWS(factory)
webdir = File(".")
web = Site(webdir)
reactor.listenTCP(8080, web)
reactor.run()
Thanks
Pass the class instance of BroadcastServerFactory to be called to the class instance that calls it process on creation
class process(threading.Thread):
def __init__(self, buffer3m, broadcast_server_factory):
threading.Thread.__init__(self)
self.setDaemon(True)
self.buffer3 = buffer3
self.factory = broadcast_server_factory
def run(self):
self.factory.broadcast("I don't know what I'm doing!")
and then call it (it's assigned as self.factory in the run statement. I can't see where you create a process class in your __main__ but it will be created with something like
p = process(buffer, factory)
Aside: Using capital letters for class names is considered good form in python process -> Process

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