def run_loadbal(input, output, context=None):
context = context or zmq.Context.instance()
# Set up a callback so we can be notified when the device connects/binds
# its input and output sockets. This resolves issues with attempting to
# connect to `inproc:` sockets before they've been bound at the other end.
callback = Callback()
# Run the load balancer device in a separate thread. This will die once
# all its sockets are closed and the context terminated.
loadbal = LoadBalancer(input, output, context=context)
loadbal_thread = threading.Thread(target=loadbal.run,
kwargs={'callback': callback})
loadbal_thread.daemon = True
loadbal_thread.start()
in_sock, out_sock = callback.wait()
client = context.socket(zmq.REQ)
client.connect(input)
try:
yield client
finally:
client.close()
in_sock.close()
out_sock.close()
def run_loadbal(input, output, context=None):
context = context or zmq.Context.instance()
# Set up a callback so we can be notified when the device connects/binds
# its input and output sockets. This resolves issues with attempting to
# connect to `inproc:` sockets before they've been bound at the other end.
callback = Callback()
# Run the load balancer device in a separate thread. This will die once
# all its sockets are closed and the context terminated.
loadbal = LoadBalancer(input, output, context=context)
loadbal_thread = threading.Thread(target=loadbal.run,
kwargs={'callback': callback})
loadbal_thread.daemon = True
loadbal_thread.start()
in_sock, out_sock = callback.wait()
client = context.socket(zmq.REQ)
client.connect(input)
try:
yield client
finally:
client.close()
in_sock.close()
out_sock.close()
def test_callback_returns_values():
cb = Callback()
def return_value(callback):
callback.send(123)
with run_thread(return_value, cb):
assert cb.wait() == 123
def test_reset_allows_a_callback_to_be_used_again():
cb = Callback()
def return_value(callback):
callback.send(123)
with run_thread(return_value, cb):
assert cb.wait() == 123
cb.reset()
def return_value2(callback):
callback.send(456)
with run_thread(return_value2, cb):
assert cb.wait() == 456
def test_callback_throws_errors():
cb = Callback()
def throw_error(callback):
callback.throw(SomeError("ABC"))
with run_thread(throw_error, cb):
assert_raises(SomeError, cb.wait)
def test_catch_exceptions_throws_any_unhandled_exceptions_in_waiting_thread():
cb = Callback()
def catch_exception(callback):
with callback.catch_exceptions():
raise SomeError("ABC")
with run_thread(catch_exception, cb):
assert_raises(SomeError, cb.wait)
def multiserver_and_client(address, registry, n_workers):
context = zmq.Context.instance()
try:
cb = Callback()
ms = MultiServer(address, registry, context=context)
ms_thread = cb.spawn(ms.run, args=(n_workers,),
kwargs={'callback': cb}, daemon=True)
cb.wait()
client = context.socket(zmq.REQ)
client.connect(address)
try:
yield client
finally:
client.close()
finally:
context.term()
def server(addr, registry, connect=False, context=None):
context = context or zmq.Context.instance()
# Set up a server, tell it to run in a separate thread, and pass in a
# callback so that we can wait for the server to be bound before connecting
# our client. This avoids an issue we were having with inproc:// transport,
# wherein if the client connected before the server had bound, it would
# raise an error.
callback = Callback()
server = Server(addr, registry, connect=connect, context=context)
server_thread = threading.Thread(target=server.run,
kwargs=dict(callback=callback))
server_thread.daemon = True
server_thread.start()
server_socket = callback.wait()
try:
yield
finally:
context.term()
def server(addr, registry, connect=False, context=None):
context = context or zmq.Context.instance()
# Set up a server, tell it to run in a separate thread, and pass in a
# callback so that we can wait for the server to be bound before connecting
# our client. This avoids an issue we were having with inproc:// transport,
# wherein if the client connected before the server had bound, it would
# raise an error.
callback = Callback()
server = Server(addr, registry, connect=connect, context=context)
server_thread = threading.Thread(
target=server.run,
kwargs=dict(callback=callback))
server_thread.daemon = True
server_thread.start()
server_socket = callback.wait()
try:
yield
finally:
context.term()
def test_catch_exceptions_without_die_arg_propagates_exceptions_in_both_threads(
):
cb = Callback()
success = [False]
def catch_exception_without_dying(callback):
with assert_raises(SomeError):
with callback.catch_exceptions(die=False):
raise SomeError("ABC")
success[0] = True
with run_thread(catch_exception_without_dying, cb):
assert_raises(SomeError, cb.wait)
assert success[0], "Exception wasn't raised within the original thread"
def test_reset_allows_a_callback_to_be_used_again():
cb = Callback()
def return_value(callback):
callback.send(123)
with run_thread(return_value, cb):
assert cb.wait() == 123
cb.reset()
def return_value2(callback):
callback.send(456)
with run_thread(return_value2, cb):
assert cb.wait() == 456
def test_callback_returns_values():
cb = Callback()
def return_value(callback):
callback.send(123)
with run_thread(return_value, cb):
assert cb.wait() == 123
