You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
282 lines
8.3 KiB
282 lines
8.3 KiB
"""Classes for running 0MQ Devices in the background."""
|
|
|
|
# Copyright (C) PyZMQ Developers
|
|
# Distributed under the terms of the Modified BSD License.
|
|
|
|
|
|
import time
|
|
from threading import Thread
|
|
from multiprocessing import Process
|
|
|
|
from zmq import device, QUEUE, REQ, Context, ETERM, ZMQBindError, ZMQError
|
|
|
|
|
|
class Device:
|
|
"""A 0MQ Device to be run in the background.
|
|
|
|
You do not pass Socket instances to this, but rather Socket types::
|
|
|
|
Device(device_type, in_socket_type, out_socket_type)
|
|
|
|
For instance::
|
|
|
|
dev = Device(zmq.QUEUE, zmq.DEALER, zmq.ROUTER)
|
|
|
|
Similar to zmq.device, but socket types instead of sockets themselves are
|
|
passed, and the sockets are created in the work thread, to avoid issues
|
|
with thread safety. As a result, additional bind_{in|out} and
|
|
connect_{in|out} methods and setsockopt_{in|out} allow users to specify
|
|
connections for the sockets.
|
|
|
|
Parameters
|
|
----------
|
|
device_type : int
|
|
The 0MQ Device type
|
|
{in|out}_type : int
|
|
zmq socket types, to be passed later to context.socket(). e.g.
|
|
zmq.PUB, zmq.SUB, zmq.REQ. If out_type is < 0, then in_socket is used
|
|
for both in_socket and out_socket.
|
|
|
|
Methods
|
|
-------
|
|
bind_{in_out}(iface)
|
|
passthrough for ``{in|out}_socket.bind(iface)``, to be called in the thread
|
|
connect_{in_out}(iface)
|
|
passthrough for ``{in|out}_socket.connect(iface)``, to be called in the
|
|
thread
|
|
setsockopt_{in_out}(opt,value)
|
|
passthrough for ``{in|out}_socket.setsockopt(opt, value)``, to be called in
|
|
the thread
|
|
|
|
Attributes
|
|
----------
|
|
daemon : int
|
|
sets whether the thread should be run as a daemon
|
|
Default is true, because if it is false, the thread will not
|
|
exit unless it is killed
|
|
context_factory : callable (class attribute)
|
|
Function for creating the Context. This will be Context.instance
|
|
in ThreadDevices, and Context in ProcessDevices. The only reason
|
|
it is not instance() in ProcessDevices is that there may be a stale
|
|
Context instance already initialized, and the forked environment
|
|
should *never* try to use it.
|
|
"""
|
|
|
|
context_factory = Context.instance
|
|
"""Callable that returns a context. Typically either Context.instance or Context,
|
|
depending on whether the device should share the global instance or not.
|
|
"""
|
|
|
|
def __init__(self, device_type=QUEUE, in_type=None, out_type=None):
|
|
self.device_type = device_type
|
|
if in_type is None:
|
|
raise TypeError("in_type must be specified")
|
|
if out_type is None:
|
|
raise TypeError("out_type must be specified")
|
|
self.in_type = in_type
|
|
self.out_type = out_type
|
|
self._in_binds = []
|
|
self._in_connects = []
|
|
self._in_sockopts = []
|
|
self._out_binds = []
|
|
self._out_connects = []
|
|
self._out_sockopts = []
|
|
self._random_addrs = []
|
|
self.daemon = True
|
|
self.done = False
|
|
|
|
def bind_in(self, addr):
|
|
"""Enqueue ZMQ address for binding on in_socket.
|
|
|
|
See zmq.Socket.bind for details.
|
|
"""
|
|
self._in_binds.append(addr)
|
|
|
|
def bind_in_to_random_port(self, addr, *args, **kwargs):
|
|
"""Enqueue a random port on the given interface for binding on
|
|
in_socket.
|
|
|
|
See zmq.Socket.bind_to_random_port for details.
|
|
|
|
.. versionadded:: 18.0
|
|
"""
|
|
port = self._reserve_random_port(addr, *args, **kwargs)
|
|
|
|
self.bind_in('%s:%i' % (addr, port))
|
|
|
|
return port
|
|
|
|
def connect_in(self, addr):
|
|
"""Enqueue ZMQ address for connecting on in_socket.
|
|
|
|
See zmq.Socket.connect for details.
|
|
"""
|
|
self._in_connects.append(addr)
|
|
|
|
def setsockopt_in(self, opt, value):
|
|
"""Enqueue setsockopt(opt, value) for in_socket
|
|
|
|
See zmq.Socket.setsockopt for details.
|
|
"""
|
|
self._in_sockopts.append((opt, value))
|
|
|
|
def bind_out(self, addr):
|
|
"""Enqueue ZMQ address for binding on out_socket.
|
|
|
|
See zmq.Socket.bind for details.
|
|
"""
|
|
self._out_binds.append(addr)
|
|
|
|
def bind_out_to_random_port(self, addr, *args, **kwargs):
|
|
"""Enqueue a random port on the given interface for binding on
|
|
out_socket.
|
|
|
|
See zmq.Socket.bind_to_random_port for details.
|
|
|
|
.. versionadded:: 18.0
|
|
"""
|
|
port = self._reserve_random_port(addr, *args, **kwargs)
|
|
|
|
self.bind_out('%s:%i' % (addr, port))
|
|
|
|
return port
|
|
|
|
def connect_out(self, addr):
|
|
"""Enqueue ZMQ address for connecting on out_socket.
|
|
|
|
See zmq.Socket.connect for details.
|
|
"""
|
|
self._out_connects.append(addr)
|
|
|
|
def setsockopt_out(self, opt, value):
|
|
"""Enqueue setsockopt(opt, value) for out_socket
|
|
|
|
See zmq.Socket.setsockopt for details.
|
|
"""
|
|
self._out_sockopts.append((opt, value))
|
|
|
|
def _reserve_random_port(self, addr, *args, **kwargs):
|
|
ctx = Context()
|
|
|
|
binder = ctx.socket(REQ)
|
|
|
|
for i in range(5):
|
|
port = binder.bind_to_random_port(addr, *args, **kwargs)
|
|
|
|
new_addr = '%s:%i' % (addr, port)
|
|
|
|
if new_addr in self._random_addrs:
|
|
continue
|
|
else:
|
|
break
|
|
else:
|
|
raise ZMQBindError("Could not reserve random port.")
|
|
|
|
self._random_addrs.append(new_addr)
|
|
|
|
binder.close()
|
|
|
|
return port
|
|
|
|
def _setup_sockets(self):
|
|
ctx = self.context_factory()
|
|
|
|
self._context = ctx
|
|
|
|
# create the sockets
|
|
ins = ctx.socket(self.in_type)
|
|
if self.out_type < 0:
|
|
outs = ins
|
|
else:
|
|
outs = ctx.socket(self.out_type)
|
|
|
|
# set sockopts (must be done first, in case of zmq.IDENTITY)
|
|
for opt,value in self._in_sockopts:
|
|
ins.setsockopt(opt, value)
|
|
for opt,value in self._out_sockopts:
|
|
outs.setsockopt(opt, value)
|
|
|
|
for iface in self._in_binds:
|
|
ins.bind(iface)
|
|
for iface in self._out_binds:
|
|
outs.bind(iface)
|
|
|
|
for iface in self._in_connects:
|
|
ins.connect(iface)
|
|
for iface in self._out_connects:
|
|
outs.connect(iface)
|
|
|
|
return ins,outs
|
|
|
|
def run_device(self):
|
|
"""The runner method.
|
|
|
|
Do not call me directly, instead call ``self.start()``, just like a Thread.
|
|
"""
|
|
ins,outs = self._setup_sockets()
|
|
device(self.device_type, ins, outs)
|
|
|
|
def run(self):
|
|
"""wrap run_device in try/catch ETERM"""
|
|
try:
|
|
self.run_device()
|
|
except ZMQError as e:
|
|
if e.errno == ETERM:
|
|
# silence TERM errors, because this should be a clean shutdown
|
|
pass
|
|
else:
|
|
raise
|
|
finally:
|
|
self.done = True
|
|
|
|
def start(self):
|
|
"""Start the device. Override me in subclass for other launchers."""
|
|
return self.run()
|
|
|
|
def join(self,timeout=None):
|
|
"""wait for me to finish, like Thread.join.
|
|
|
|
Reimplemented appropriately by subclasses."""
|
|
tic = time.time()
|
|
toc = tic
|
|
while not self.done and not (timeout is not None and toc-tic > timeout):
|
|
time.sleep(.001)
|
|
toc = time.time()
|
|
|
|
|
|
class BackgroundDevice(Device):
|
|
"""Base class for launching Devices in background processes and threads."""
|
|
|
|
launcher=None
|
|
_launch_class=None
|
|
|
|
def start(self):
|
|
self.launcher = self._launch_class(target=self.run)
|
|
self.launcher.daemon = self.daemon
|
|
return self.launcher.start()
|
|
|
|
def join(self, timeout=None):
|
|
return self.launcher.join(timeout=timeout)
|
|
|
|
|
|
class ThreadDevice(BackgroundDevice):
|
|
"""A Device that will be run in a background Thread.
|
|
|
|
See Device for details.
|
|
"""
|
|
_launch_class=Thread
|
|
|
|
class ProcessDevice(BackgroundDevice):
|
|
"""A Device that will be run in a background Process.
|
|
|
|
See Device for details.
|
|
"""
|
|
_launch_class=Process
|
|
context_factory = Context
|
|
"""Callable that returns a context. Typically either Context.instance or Context,
|
|
depending on whether the device should share the global instance or not.
|
|
"""
|
|
|
|
|
|
__all__ = ['Device', 'ThreadDevice', 'ProcessDevice']
|