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"""
Monkey patches for supporting Twisted 2.5.0
NOTE: This module must not fail if twisted module is not available.
"""
# This function comes bundled with Twisted 8.x and above
def add_missing_blockingCallFromThread():
import Queue
from twisted.internet import defer
from twisted.python import failure
def blockingCallFromThread(reactor, f, *a, **kw):
"""
Run a function in the reactor from a thread, and wait for the result
synchronously, i.e. until the callback chain returned by the function
get a result.
@param reactor: The L{IReactorThreads} provider which will be used to
schedule the function call.
@param f: the callable to run in the reactor thread
@type f: any callable.
@param a: the arguments to pass to C{f}.
@param kw: the keyword arguments to pass to C{f}.
@return: the result of the callback chain.
@raise: any error raised during the callback chain.
"""
queue = Queue.Queue()
def _callFromThread():
result = defer.maybeDeferred(f, *a, **kw)
result.addBoth(queue.put)
reactor.callFromThread(_callFromThread)
result = queue.get()
if isinstance(result, failure.Failure):
result.raiseException()
return result
from twisted.internet import threads
threads.blockingCallFromThread = blockingCallFromThread
try:
import twisted
if twisted.__version__ < '8.0.0':
add_missing_blockingCallFromThread()
except ImportError:
pass
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