def __init__(self, cxn):
"""Create a synchronous wrapper around an asynchronous connection.
Args:
cxn (labrad.protocol.LabradProtocol): The asynchronous protocol
instance for which to provide a synchronous interface.
"""
self.cxn = cxn
self.name = cxn.name
self.ID = cxn.ID
self.host = cxn.host
self.port = cxn.port
self._connected = threading.Event()
self._connected.set()
# Setup a coroutine that will clear the connected flag when the
# connection is lost. We launch this but do not wait for the result of
# the future because we want this to happen asynchronously in the
# background.
@defer.inlineCallbacks
def handle_disconnect():
try:
yield cxn.onDisconnect()
except Exception:
pass
self._connected.clear()
concurrent.call_future(handle_disconnect)
def __init__(self, cxn):
"""Create a synchronous wrapper around an asynchronous connection.
Args:
cxn (labrad.protocol.LabradProtocol): The asynchronous protocol
instance for which to provide a synchronous interface.
"""
self.cxn = cxn
self.name = cxn.name
self.ID = cxn.ID
self.host = cxn.host
self.port = cxn.port
self._connected = threading.Event()
self._connected.set()
# Setup a coroutine that will clear the connected flag when the
# connection is lost. We launch this but do not wait for the result of
# the future because we want this to happen asynchronously in the
# background.
@defer.inlineCallbacks
def handle_disconnect():
try:
yield cxn.onDisconnect()
except Exception:
pass
self._connected.clear()
concurrent.call_future(handle_disconnect)
def test_synchronous_error(self):
def func():
raise ValueError()
f = concurrent.call_future(func)
with pytest.raises(ValueError):
f.result(timeout=0.1)
def test_synchronous_error(self):
def func():
raise ValueError()
f = concurrent.call_future(func)
with pytest.raises(ValueError):
f.result(timeout=0.1)
def test_set_result_outside_reactor(self):
@defer.inlineCallbacks
def func(f):
result = yield concurrent.future_to_deferred(f)
defer.returnValue(result)
f1 = Future()
f2 = concurrent.call_future(func, f1)
f1.set_result(1)
assert f2.result(timeout=0.1) == 1
def test_asynchronous_func(self):
@defer.inlineCallbacks
def func():
d = defer.Deferred()
reactor.callLater(0, d.callback, 'woot')
result = yield d
defer.returnValue(result)
f = concurrent.call_future(func)
assert f.result(timeout=0.1) == 'woot'
def test_set_result_outside_reactor(self):
@defer.inlineCallbacks
def func(f):
result = yield concurrent.future_to_deferred(f)
defer.returnValue(result)
f1 = Future()
f2 = concurrent.call_future(func, f1)
f1.set_result(1)
assert f2.result(timeout=0.1) == 1
def test_asynchronous_func(self):
@defer.inlineCallbacks
def func():
d = defer.Deferred()
reactor.callLater(0, d.callback, 'woot')
result = yield d
defer.returnValue(result)
f = concurrent.call_future(func)
assert f.result(timeout=0.1) == 'woot'
def test_set_exception_outside_reactor(self):
@defer.inlineCallbacks
def func(f):
result = yield concurrent.future_to_deferred(f)
defer.returnValue(result)
f1 = Future()
f2 = concurrent.call_future(func, f1)
f1.set_exception(ValueError())
with pytest.raises(ValueError):
f2.result(timeout=0.1)
def test_set_result_inside_reactor(self):
@defer.inlineCallbacks
def func(f):
d = concurrent.future_to_deferred(f)
f.set_result(1)
result = yield d
defer.returnValue(result)
f = Future()
future = concurrent.call_future(func, f)
assert future.result() == 1
def test_asynchronous_error(self):
@defer.inlineCallbacks
def func():
d = defer.Deferred()
reactor.callLater(0, d.callback, 'woot')
result = yield d
raise ValueError()
f = concurrent.call_future(func)
with pytest.raises(ValueError):
f.result(timeout=0.1)
def test_set_result_inside_reactor(self):
@defer.inlineCallbacks
def func(f):
d = concurrent.future_to_deferred(f)
f.set_result(1)
result = yield d
defer.returnValue(result)
f = Future()
future = concurrent.call_future(func, f)
assert future.result() == 1
def test_set_exception_outside_reactor(self):
@defer.inlineCallbacks
def func(f):
result = yield concurrent.future_to_deferred(f)
defer.returnValue(result)
f1 = Future()
f2 = concurrent.call_future(func, f1)
f1.set_exception(ValueError())
with pytest.raises(ValueError):
f2.result(timeout=0.1)
def test_asynchronous_error(self):
@defer.inlineCallbacks
def func():
d = defer.Deferred()
reactor.callLater(0, d.callback, 'woot')
result = yield d
raise ValueError()
f = concurrent.call_future(func)
with pytest.raises(ValueError):
f.result(timeout=0.1)
def test_set_result_inside_reactor(self):
@defer.inlineCallbacks
def func(f):
d = concurrent.future_to_deferred(f)
f.set_exception(ValueError())
result = yield d
defer.returnValue(result)
f = Future()
future = concurrent.call_future(func, f)
with pytest.raises(ValueError):
future.result()
def test_set_result_inside_reactor(self):
@defer.inlineCallbacks
def func(f):
d = concurrent.future_to_deferred(f)
f.set_exception(ValueError())
result = yield d
defer.returnValue(result)
f = Future()
future = concurrent.call_future(func, f)
with pytest.raises(ValueError):
future.result()
def connect(host=C.MANAGER_HOST, port=None, name=None, timeout=C.TIMEOUT, **kw):
"""Create a backend connection to labrad.
This connects to labrad asynchronously and then wraps the underlying async
connection object in a synchronous TwistedConnection interface.
"""
name = name or 'Python Client ({})'.format(support.getNodeName())
thread.startReactor()
future = concurrent.call_future(getConnection, host, port, name, **kw)
cxn = future.result(timeout=timeout)
return TwistedConnection(cxn)
def connect(host=C.MANAGER_HOST,
port=None,
name=None,
timeout=C.TIMEOUT,
**kw):
"""Create a backend connection to labrad.
This connects to labrad asynchronously and then wraps the underlying async
connection object in a synchronous TwistedConnection interface.
"""
name = name or 'Python Client ({})'.format(support.getNodeName())
thread.startReactor()
future = concurrent.call_future(getConnection, host, port, name, **kw)
cxn = future.result(timeout=timeout)
return TwistedConnection(cxn)
def test_synchronous_func(self):
def func():
return threadable.isInIOThread()
f = concurrent.call_future(func)
assert f.result(timeout=0.1)
def sendRequest(self, target, records, *args, **kw):
return concurrent.call_future(self.cxn.sendRequest, target, records,
*args, **kw)
def sendMessage(self, target, records, *args, **kw):
return concurrent.call_future(self.cxn.sendMessage, target, records,
*args, **kw).result()
def sendRequest(self, target, records, *args, **kw):
return concurrent.call_future(self.cxn.sendRequest, target, records,
*args, **kw)
def disconnect(self):
if self.connected:
concurrent.call_future(self.cxn.disconnect).result()
# Wait for the connected flag to go False.
while self.connected:
time.sleep(0.01)
def disconnect(self):
if self.connected:
concurrent.call_future(self.cxn.disconnect).result()
# Wait for the connected flag to go False.
while self.connected:
time.sleep(0.01)
def context(self):
"""Create a new context for use with this connection"""
return concurrent.call_future(self.cxn.context).result()
def spawn(self, timeout=C.TIMEOUT):
"""Start a new independent backend connection to the same manager."""
cxn = concurrent.call_future(self.cxn.spawn).result(timeout=timeout)
return TwistedConnection(cxn)
def context(self):
"""Create a new context for use with this connection"""
return concurrent.call_future(self.cxn.context).result()
def spawn(self, timeout=C.TIMEOUT):
"""Start a new independent backend connection to the same manager."""
cxn = concurrent.call_future(self.cxn.spawn).result(timeout=timeout)
return TwistedConnection(cxn)
def test_synchronous_func(self):
def func():
return threadable.isInIOThread()
f = concurrent.call_future(func)
assert f.result(timeout=0.1)
def sendMessage(self, target, records, *args, **kw):
return concurrent.call_future(self.cxn.sendMessage, target, records,
*args, **kw).result()
