136 lines
3.3 KiB
Python
136 lines
3.3 KiB
Python
# zmq_reqresp.py
|
|
import asyncio
|
|
import zmq
|
|
import zmq.asyncio
|
|
from .background import Background
|
|
from inspect import iscoroutinefunction
|
|
|
|
class ZmqRequester(object):
|
|
def __init__(self, url, async_mode=False, timeout=0):
|
|
super().__init__()
|
|
self.async_mode = async_mode
|
|
self.url = url
|
|
self.timeout = timeout
|
|
self._connect()
|
|
|
|
def __del__(self):
|
|
self._close()
|
|
|
|
def _connect(self):
|
|
if self.async_mode:
|
|
self.ctx = zmq.asyncio.Context()
|
|
else:
|
|
self.ctx = zmq.Context()
|
|
|
|
# Socket to talk to server
|
|
self.sock = self.ctx.socket(zmq.REQ)
|
|
self.sock.connect(self.url)
|
|
if self.timeout > 0:
|
|
self.sock.setsockopt(zmq.LINGER, 0)
|
|
self.poller = zmq.Poller()
|
|
self.poller.register(self.sock, zmq.POLLIN)
|
|
|
|
def _close(self):
|
|
self.sock.close()
|
|
self.ctx.term()
|
|
|
|
def send(self, msg):
|
|
"""
|
|
send s string to responser, and return a string
|
|
"""
|
|
if self.async_mode:
|
|
raise Exception('ZMQ_Requester: in async mode, use asend instead')
|
|
b = msg.encode('utf-8')
|
|
r = self.send_b(b)
|
|
if r is not None:
|
|
return r.decode('utf-8')
|
|
return None
|
|
|
|
def send_b(self, b):
|
|
"""
|
|
send a bytes and return a bytes
|
|
"""
|
|
if self.async_mode:
|
|
raise Exception('ZMQ_Requester: in async mode, use asend_b instead')
|
|
self.sock.send(b)
|
|
if self.timeout > 0:
|
|
if self.poller.poll(self.timeout * 1000):
|
|
return self.sock.recv()
|
|
else:
|
|
self._close()
|
|
self._connect()
|
|
return None
|
|
else:
|
|
return self.sock.recv()
|
|
|
|
async def asend_b(self, b):
|
|
if not self.async_mode:
|
|
raise Exception('ZMQ_Requester: not in async mode, use send_b instead')
|
|
await self.sock.send_multipart([b])
|
|
if self.timeout > 0:
|
|
if self.poller.poll(self.timeout * 1000):
|
|
r = await self.sock.recv_multipart()
|
|
return r
|
|
else:
|
|
self._close()
|
|
self._connect()
|
|
return None
|
|
r = await self.sock.recv_multipart()
|
|
return r[0]
|
|
|
|
async def asend(self, msg):
|
|
if not self.async_mode:
|
|
raise Exception('ZMQ_Requester: not in async mode, use send instead')
|
|
b = msg.encode('utf-8')
|
|
r = await self.asend_b(b)
|
|
if r is None:
|
|
return None
|
|
return r.decode('utf-8')
|
|
|
|
class ZmqReplier(object):
|
|
def __init__(self, url, handler, async_mode=False):
|
|
self.async_mode = async_mode
|
|
self.url = url
|
|
if not self.async_mode and iscoroutinefunction(handler):
|
|
raise('not in async mode, handler can not be a coroutine')
|
|
|
|
self.handler = handler
|
|
if self.async_mode:
|
|
self.ctx = zmq.asyncio.Context()
|
|
else:
|
|
self.ctx = zmq.Context()
|
|
self.sock = self.ctx.socket(zmq.REP)
|
|
self.sock.bind(self.url)
|
|
self.keep_running = True
|
|
|
|
async def async_run(self):
|
|
while self.keep_running:
|
|
bs = await self.sock.recv_multipart()
|
|
b = b[0]
|
|
if iscoroutinefunction(self.handler):
|
|
rb = await self.handler(b)
|
|
else:
|
|
rb =self.self.handler(b)
|
|
|
|
if isinstance(rb, str):
|
|
rb = rb.encode('utf-8')
|
|
await self.sock.send_multipart([rb])
|
|
|
|
def run(self):
|
|
self.background = Background(self._run)
|
|
self.background.daemon = True
|
|
self.background.start()
|
|
|
|
def _run(self):
|
|
while self.keep_running:
|
|
b = self.sock.recv()
|
|
|
|
rb = self.handler(b)
|
|
if isinstance(rb, str):
|
|
rb = rb.encode('utf-8')
|
|
self.sock.send(rb)
|
|
|
|
def stop(self):
|
|
self.keep_running = False
|
|
self.join()
|