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#!/usr/bin/env python
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# encoding: utf-8
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"""This module contains blocking clients for the controller interfaces.
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Unlike the clients in `asyncclient.py`, the clients in this module are fully
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blocking. This means that methods on the clients return the actual results
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rather than a deferred to the result. Also, we manage the Twisted reactor
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for you. This is done by running the reactor in a thread.
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The main classes in this module are:
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* MultiEngineClient
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* TaskClient
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* Task
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* CompositeError
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2009 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Warnings control
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#-----------------------------------------------------------------------------
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import warnings
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# Twisted generates annoying warnings with Python 2.6, as will do other code
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# that imports 'sets' as of today
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warnings.filterwarnings('ignore', 'the sets module is deprecated',
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DeprecationWarning )
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# This one also comes from Twisted
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warnings.filterwarnings('ignore', 'the sha module is deprecated',
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DeprecationWarning)
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import sys
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import twisted
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from twisted.internet import reactor
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from twisted.python import log
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from IPython.kernel.clientconnector import ClientConnector, Cluster
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from IPython.kernel.twistedutil import ReactorInThread
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from IPython.kernel.twistedutil import blockingCallFromThread
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# These enable various things
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from IPython.kernel import codeutil
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# Other things that the user will need
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from IPython.kernel.task import MapTask, StringTask
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from IPython.kernel.error import CompositeError
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#-------------------------------------------------------------------------------
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# Code
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#-------------------------------------------------------------------------------
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# PotentialZombieWarning is deprecated from Twisted 10.0.0 and above and
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# using the filter on > 10.0.0 creates a warning itself.
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if twisted.version.major < 10:
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from twisted.internet.error import PotentialZombieWarning
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warnings.simplefilter('ignore', PotentialZombieWarning)
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_client_tub = ClientConnector()
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get_multiengine_client = _client_tub.get_multiengine_client
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get_task_client = _client_tub.get_task_client
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MultiEngineClient = get_multiengine_client
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TaskClient = get_task_client
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# This isn't great. I should probably set this up in the ReactorInThread
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# class below. But, it does work for now.
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log.startLogging(sys.stdout, setStdout=0)
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def _result_list_printer(obj, p, cycle):
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if cycle:
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return p.text('ResultList(...)')
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return p.text(repr(obj))
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# ResultList is a list subclass and will use the default pretty printer.
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# This overrides that to use the __repr__ of ResultList.
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ip = get_ipython()
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ip.displayhook.default_formatter.for_type_by_name(
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'IPython.kernel.multiengineclient', 'ResultList', _result_list_printer
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)
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# Now we start the reactor in a thread
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rit = ReactorInThread()
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rit.setDaemon(True)
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rit.start()
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__all__ = [
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'MapTask',
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'StringTask',
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'MultiEngineClient',
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'TaskClient',
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'CompositeError',
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'get_task_client',
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'get_multiengine_client',
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'Cluster'
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]
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