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# encoding: utf-8
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# -*- test-case-name: IPython.kernel.tests.test_engineservice -*-
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"""A Twisted Service Representation of the IPython core.
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The IPython Core exposed to the network is called the Engine. Its
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representation in Twisted in the EngineService. Interfaces and adapters
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are used to abstract out the details of the actual network protocol used.
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The EngineService is an Engine that knows nothing about the actual protocol
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used.
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The EngineService is exposed with various network protocols in modules like:
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enginepb.py
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enginevanilla.py
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As of 12/12/06 the classes in this module have been simplified greatly. It was
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felt that we had over-engineered things. To improve the maintainability of the
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code we have taken out the ICompleteEngine interface and the completeEngine
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method that automatically added methods to engines.
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"""
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__docformat__ = "restructuredtext en"
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#-------------------------------------------------------------------------------
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# Copyright (C) 2008 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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# Imports
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#-------------------------------------------------------------------------------
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# Tell nose to skip the testing of this module
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__test__ = {}
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import os, sys, copy
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import cPickle as pickle
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from new import instancemethod
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from twisted.application import service
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from twisted.internet import defer, reactor
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from twisted.python import log, failure, components
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import zope.interface as zi
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from IPython.kernel.core.interpreter import Interpreter
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from IPython.kernel import newserialized, error, util
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from IPython.kernel.util import printer
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from IPython.kernel.twistedutil import gatherBoth, DeferredList
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from IPython.kernel import codeutil
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#-------------------------------------------------------------------------------
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# Interface specification for the Engine
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#-------------------------------------------------------------------------------
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class IEngineCore(zi.Interface):
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"""The minimal required interface for the IPython Engine.
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This interface provides a formal specification of the IPython core.
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All these methods should return deferreds regardless of what side of a
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network connection they are on.
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In general, this class simply wraps a shell class and wraps its return
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values as Deferred objects. If the underlying shell class method raises
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an exception, this class should convert it to a twisted.failure.Failure
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that will be propagated along the Deferred's errback chain.
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In addition, Failures are aggressive. By this, we mean that if a method
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is performing multiple actions (like pulling multiple object) if any
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single one fails, the entire method will fail with that Failure. It is
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all or nothing.
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"""
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id = zi.interface.Attribute("the id of the Engine object")
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properties = zi.interface.Attribute("A dict of properties of the Engine")
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def execute(lines):
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"""Execute lines of Python code.
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Returns a dictionary with keys (id, number, stdin, stdout, stderr)
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upon success.
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Returns a failure object if the execution of lines raises an exception.
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"""
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def push(namespace):
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"""Push dict namespace into the user's namespace.
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Returns a deferred to None or a failure.
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"""
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def pull(keys):
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"""Pulls values out of the user's namespace by keys.
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Returns a deferred to a tuple objects or a single object.
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Raises NameError if any one of objects doess not exist.
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"""
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def push_function(namespace):
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"""Push a dict of key, function pairs into the user's namespace.
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Returns a deferred to None or a failure."""
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def pull_function(keys):
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"""Pulls functions out of the user's namespace by keys.
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Returns a deferred to a tuple of functions or a single function.
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Raises NameError if any one of the functions does not exist.
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"""
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def get_result(i=None):
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"""Get the stdin/stdout/stderr of command i.
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Returns a deferred to a dict with keys
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(id, number, stdin, stdout, stderr).
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Raises IndexError if command i does not exist.
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Raises TypeError if i in not an int.
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"""
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def reset():
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"""Reset the shell.
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This clears the users namespace. Won't cause modules to be
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reloaded. Should also re-initialize certain variables like id.
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"""
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def kill():
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"""Kill the engine by stopping the reactor."""
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def keys():
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"""Return the top level variables in the users namspace.
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Returns a deferred to a dict."""
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class IEngineSerialized(zi.Interface):
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"""Push/Pull methods that take Serialized objects.
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All methods should return deferreds.
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"""
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def push_serialized(namespace):
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"""Push a dict of keys and Serialized objects into the user's namespace."""
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def pull_serialized(keys):
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"""Pull objects by key from the user's namespace as Serialized.
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Returns a list of or one Serialized.
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Raises NameError is any one of the objects does not exist.
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"""
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class IEngineProperties(zi.Interface):
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"""Methods for access to the properties object of an Engine"""
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properties = zi.Attribute("A StrictDict object, containing the properties")
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def set_properties(properties):
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"""set properties by key and value"""
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def get_properties(keys=None):
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"""get a list of properties by `keys`, if no keys specified, get all"""
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def del_properties(keys):
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"""delete properties by `keys`"""
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def has_properties(keys):
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"""get a list of bool values for whether `properties` has `keys`"""
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def clear_properties():
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"""clear the properties dict"""
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class IEngineBase(IEngineCore, IEngineSerialized, IEngineProperties):
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"""The basic engine interface that EngineService will implement.
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This exists so it is easy to specify adapters that adapt to and from the
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API that the basic EngineService implements.
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"""
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pass
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class IEngineQueued(IEngineBase):
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"""Interface for adding a queue to an IEngineBase.
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This interface extends the IEngineBase interface to add methods for managing
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the engine's queue. The implicit details of this interface are that the
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execution of all methods declared in IEngineBase should appropriately be
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put through a queue before execution.
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All methods should return deferreds.
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"""
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def clear_queue():
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"""Clear the queue."""
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def queue_status():
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"""Get the queued and pending commands in the queue."""
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def register_failure_observer(obs):
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"""Register an observer of pending Failures.
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The observer must implement IFailureObserver.
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"""
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def unregister_failure_observer(obs):
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"""Unregister an observer of pending Failures."""
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class IEngineThreaded(zi.Interface):
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"""A place holder for threaded commands.
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All methods should return deferreds.
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"""
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pass
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#-------------------------------------------------------------------------------
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# Functions and classes to implement the EngineService
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#-------------------------------------------------------------------------------
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class StrictDict(dict):
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"""This is a strict copying dictionary for use as the interface to the
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properties of an Engine.
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:IMPORTANT:
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This object copies the values you set to it, and returns copies to you
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when you request them. The only way to change properties os explicitly
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through the setitem and getitem of the dictionary interface.
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Example:
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>>> e = get_engine(id)
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>>> L = [1,2,3]
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>>> e.properties['L'] = L
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>>> L == e.properties['L']
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True
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>>> L.append(99)
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>>> L == e.properties['L']
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False
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Note that getitem copies, so calls to methods of objects do not affect
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the properties, as seen here:
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>>> e.properties[1] = range(2)
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>>> print e.properties[1]
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[0, 1]
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>>> e.properties[1].append(2)
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>>> print e.properties[1]
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[0, 1]
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"""
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def __init__(self, *args, **kwargs):
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dict.__init__(self, *args, **kwargs)
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self.modified = True
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def __getitem__(self, key):
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return copy.deepcopy(dict.__getitem__(self, key))
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def __setitem__(self, key, value):
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# check if this entry is valid for transport around the network
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# and copying
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try:
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pickle.dumps(key, 2)
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pickle.dumps(value, 2)
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newvalue = copy.deepcopy(value)
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except:
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raise error.InvalidProperty(value)
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dict.__setitem__(self, key, newvalue)
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self.modified = True
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def __delitem__(self, key):
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dict.__delitem__(self, key)
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self.modified = True
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def update(self, dikt):
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for k,v in dikt.iteritems():
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self[k] = v
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def pop(self, key):
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self.modified = True
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return dict.pop(self, key)
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def popitem(self):
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self.modified = True
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return dict.popitem(self)
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def clear(self):
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self.modified = True
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dict.clear(self)
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def subDict(self, *keys):
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d = {}
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for key in keys:
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d[key] = self[key]
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return d
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class EngineAPI(object):
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"""This is the object through which the user can edit the `properties`
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attribute of an Engine.
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The Engine Properties object copies all object in and out of itself.
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See the EngineProperties object for details.
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"""
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_fix=False
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def __init__(self, id):
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self.id = id
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self.properties = StrictDict()
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self._fix=True
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def __setattr__(self, k,v):
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if self._fix:
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raise error.KernelError("I am protected!")
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else:
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object.__setattr__(self, k, v)
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def __delattr__(self, key):
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raise error.KernelError("I am protected!")
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_apiDict = {}
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def get_engine(id):
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"""Get the Engine API object, whcih currently just provides the properties
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object, by ID"""
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global _apiDict
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if not _apiDict.get(id):
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_apiDict[id] = EngineAPI(id)
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return _apiDict[id]
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def drop_engine(id):
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"""remove an engine"""
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global _apiDict
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if _apiDict.has_key(id):
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del _apiDict[id]
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class EngineService(object, service.Service):
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"""Adapt a IPython shell into a IEngine implementing Twisted Service."""
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zi.implements(IEngineBase)
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name = 'EngineService'
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def __init__(self, shellClass=Interpreter, mpi=None):
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"""Create an EngineService.
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shellClass: something that implements IInterpreter or core1
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mpi: an mpi module that has rank and size attributes
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"""
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self.shellClass = shellClass
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self.shell = self.shellClass()
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self.mpi = mpi
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self.id = None
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self.properties = get_engine(self.id).properties
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if self.mpi is not None:
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log.msg("MPI started with rank = %i and size = %i" %
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(self.mpi.rank, self.mpi.size))
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self.id = self.mpi.rank
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self._seedNamespace()
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# Make id a property so that the shell can get the updated id
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def _setID(self, id):
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self._id = id
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self.properties = get_engine(id).properties
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self.shell.push({'id': id})
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def _getID(self):
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return self._id
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id = property(_getID, _setID)
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def _seedNamespace(self):
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self.shell.push({'mpi': self.mpi, 'id' : self.id})
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def executeAndRaise(self, msg, callable, *args, **kwargs):
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"""Call a method of self.shell and wrap any exception."""
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d = defer.Deferred()
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try:
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result = callable(*args, **kwargs)
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except:
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# This gives the following:
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# et=exception class
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# ev=exception class instance
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# tb=traceback object
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et,ev,tb = sys.exc_info()
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# This call adds attributes to the exception value
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et,ev,tb = self.shell.formatTraceback(et,ev,tb,msg)
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# Add another attribute
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ev._ipython_engine_info = msg
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f = failure.Failure(ev,et,None)
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d.errback(f)
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else:
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d.callback(result)
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return d
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# The IEngine methods. See the interface for documentation.
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def execute(self, lines):
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msg = {'engineid':self.id,
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'method':'execute',
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'args':[lines]}
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d = self.executeAndRaise(msg, self.shell.execute, lines)
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d.addCallback(self.addIDToResult)
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return d
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def addIDToResult(self, result):
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result['id'] = self.id
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return result
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def push(self, namespace):
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msg = {'engineid':self.id,
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'method':'push',
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'args':[repr(namespace.keys())]}
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d = self.executeAndRaise(msg, self.shell.push, namespace)
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return d
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def pull(self, keys):
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msg = {'engineid':self.id,
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'method':'pull',
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'args':[repr(keys)]}
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d = self.executeAndRaise(msg, self.shell.pull, keys)
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return d
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def push_function(self, namespace):
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msg = {'engineid':self.id,
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'method':'push_function',
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'args':[repr(namespace.keys())]}
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d = self.executeAndRaise(msg, self.shell.push_function, namespace)
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return d
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def pull_function(self, keys):
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msg = {'engineid':self.id,
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'method':'pull_function',
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'args':[repr(keys)]}
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d = self.executeAndRaise(msg, self.shell.pull_function, keys)
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return d
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def get_result(self, i=None):
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msg = {'engineid':self.id,
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'method':'get_result',
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'args':[repr(i)]}
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d = self.executeAndRaise(msg, self.shell.getCommand, i)
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d.addCallback(self.addIDToResult)
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return d
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def reset(self):
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msg = {'engineid':self.id,
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'method':'reset',
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'args':[]}
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del self.shell
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self.shell = self.shellClass()
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self.properties.clear()
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d = self.executeAndRaise(msg, self._seedNamespace)
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return d
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def kill(self):
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drop_engine(self.id)
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try:
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reactor.stop()
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except RuntimeError:
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log.msg('The reactor was not running apparently.')
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|
return defer.fail()
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else:
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return defer.succeed(None)
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def keys(self):
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"""Return a list of variables names in the users top level namespace.
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|
This used to return a dict of all the keys/repr(values) in the
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user's namespace. This was too much info for the ControllerService
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to handle so it is now just a list of keys.
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"""
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|
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remotes = []
|
|
|
for k in self.shell.user_ns.iterkeys():
|
|
|
if k not in ['__name__', '_ih', '_oh', '__builtins__',
|
|
|
'In', 'Out', '_', '__', '___', '__IP', 'input', 'raw_input']:
|
|
|
remotes.append(k)
|
|
|
return defer.succeed(remotes)
|
|
|
|
|
|
def set_properties(self, properties):
|
|
|
msg = {'engineid':self.id,
|
|
|
'method':'set_properties',
|
|
|
'args':[repr(properties.keys())]}
|
|
|
return self.executeAndRaise(msg, self.properties.update, properties)
|
|
|
|
|
|
def get_properties(self, keys=None):
|
|
|
msg = {'engineid':self.id,
|
|
|
'method':'get_properties',
|
|
|
'args':[repr(keys)]}
|
|
|
if keys is None:
|
|
|
keys = self.properties.keys()
|
|
|
return self.executeAndRaise(msg, self.properties.subDict, *keys)
|
|
|
|
|
|
def _doDel(self, keys):
|
|
|
for key in keys:
|
|
|
del self.properties[key]
|
|
|
|
|
|
def del_properties(self, keys):
|
|
|
msg = {'engineid':self.id,
|
|
|
'method':'del_properties',
|
|
|
'args':[repr(keys)]}
|
|
|
return self.executeAndRaise(msg, self._doDel, keys)
|
|
|
|
|
|
def _doHas(self, keys):
|
|
|
return [self.properties.has_key(key) for key in keys]
|
|
|
|
|
|
def has_properties(self, keys):
|
|
|
msg = {'engineid':self.id,
|
|
|
'method':'has_properties',
|
|
|
'args':[repr(keys)]}
|
|
|
return self.executeAndRaise(msg, self._doHas, keys)
|
|
|
|
|
|
def clear_properties(self):
|
|
|
msg = {'engineid':self.id,
|
|
|
'method':'clear_properties',
|
|
|
'args':[]}
|
|
|
return self.executeAndRaise(msg, self.properties.clear)
|
|
|
|
|
|
def push_serialized(self, sNamespace):
|
|
|
msg = {'engineid':self.id,
|
|
|
'method':'push_serialized',
|
|
|
'args':[repr(sNamespace.keys())]}
|
|
|
ns = {}
|
|
|
for k,v in sNamespace.iteritems():
|
|
|
try:
|
|
|
unserialized = newserialized.IUnSerialized(v)
|
|
|
ns[k] = unserialized.getObject()
|
|
|
except:
|
|
|
return defer.fail()
|
|
|
return self.executeAndRaise(msg, self.shell.push, ns)
|
|
|
|
|
|
def pull_serialized(self, keys):
|
|
|
msg = {'engineid':self.id,
|
|
|
'method':'pull_serialized',
|
|
|
'args':[repr(keys)]}
|
|
|
if isinstance(keys, str):
|
|
|
keys = [keys]
|
|
|
if len(keys)==1:
|
|
|
d = self.executeAndRaise(msg, self.shell.pull, keys)
|
|
|
d.addCallback(newserialized.serialize)
|
|
|
return d
|
|
|
elif len(keys)>1:
|
|
|
d = self.executeAndRaise(msg, self.shell.pull, keys)
|
|
|
@d.addCallback
|
|
|
def packThemUp(values):
|
|
|
serials = []
|
|
|
for v in values:
|
|
|
try:
|
|
|
serials.append(newserialized.serialize(v))
|
|
|
except:
|
|
|
return defer.fail(failure.Failure())
|
|
|
return serials
|
|
|
return packThemUp
|
|
|
|
|
|
|
|
|
def queue(methodToQueue):
|
|
|
def queuedMethod(this, *args, **kwargs):
|
|
|
name = methodToQueue.__name__
|
|
|
return this.submitCommand(Command(name, *args, **kwargs))
|
|
|
return queuedMethod
|
|
|
|
|
|
class QueuedEngine(object):
|
|
|
"""Adapt an IEngineBase to an IEngineQueued by wrapping it.
|
|
|
|
|
|
The resulting object will implement IEngineQueued which extends
|
|
|
IEngineCore which extends (IEngineBase, IEngineSerialized).
|
|
|
|
|
|
This seems like the best way of handling it, but I am not sure. The
|
|
|
other option is to have the various base interfaces be used like
|
|
|
mix-in intefaces. The problem I have with this is adpatation is
|
|
|
more difficult and complicated because there can be can multiple
|
|
|
original and final Interfaces.
|
|
|
"""
|
|
|
|
|
|
zi.implements(IEngineQueued)
|
|
|
|
|
|
def __init__(self, engine):
|
|
|
"""Create a QueuedEngine object from an engine
|
|
|
|
|
|
engine: An implementor of IEngineCore and IEngineSerialized
|
|
|
keepUpToDate: whether to update the remote status when the
|
|
|
queue is empty. Defaults to False.
|
|
|
"""
|
|
|
|
|
|
# This is the right way to do these tests rather than
|
|
|
# IEngineCore in list(zi.providedBy(engine)) which will only
|
|
|
# picks of the interfaces that are directly declared by engine.
|
|
|
assert IEngineBase.providedBy(engine), \
|
|
|
"engine passed to QueuedEngine doesn't provide IEngineBase"
|
|
|
|
|
|
self.engine = engine
|
|
|
self.id = engine.id
|
|
|
self.queued = []
|
|
|
self.history = {}
|
|
|
self.engineStatus = {}
|
|
|
self.currentCommand = None
|
|
|
self.failureObservers = []
|
|
|
|
|
|
def _get_properties(self):
|
|
|
return self.engine.properties
|
|
|
|
|
|
properties = property(_get_properties, lambda self, _: None)
|
|
|
# Queue management methods. You should not call these directly
|
|
|
|
|
|
def submitCommand(self, cmd):
|
|
|
"""Submit command to queue."""
|
|
|
|
|
|
d = defer.Deferred()
|
|
|
cmd.setDeferred(d)
|
|
|
if self.currentCommand is not None:
|
|
|
if self.currentCommand.finished:
|
|
|
# log.msg("Running command immediately: %r" % cmd)
|
|
|
self.currentCommand = cmd
|
|
|
self.runCurrentCommand()
|
|
|
else: # command is still running
|
|
|
# log.msg("Command is running: %r" % self.currentCommand)
|
|
|
# log.msg("Queueing: %r" % cmd)
|
|
|
self.queued.append(cmd)
|
|
|
else:
|
|
|
# log.msg("No current commands, running: %r" % cmd)
|
|
|
self.currentCommand = cmd
|
|
|
self.runCurrentCommand()
|
|
|
return d
|
|
|
|
|
|
def runCurrentCommand(self):
|
|
|
"""Run current command."""
|
|
|
|
|
|
cmd = self.currentCommand
|
|
|
f = getattr(self.engine, cmd.remoteMethod, None)
|
|
|
if f:
|
|
|
d = f(*cmd.args, **cmd.kwargs)
|
|
|
if cmd.remoteMethod is 'execute':
|
|
|
d.addCallback(self.saveResult)
|
|
|
d.addCallback(self.finishCommand)
|
|
|
d.addErrback(self.abortCommand)
|
|
|
else:
|
|
|
return defer.fail(AttributeError(cmd.remoteMethod))
|
|
|
|
|
|
def _flushQueue(self):
|
|
|
"""Pop next command in queue and run it."""
|
|
|
|
|
|
if len(self.queued) > 0:
|
|
|
self.currentCommand = self.queued.pop(0)
|
|
|
self.runCurrentCommand()
|
|
|
|
|
|
def saveResult(self, result):
|
|
|
"""Put the result in the history."""
|
|
|
self.history[result['number']] = result
|
|
|
return result
|
|
|
|
|
|
def finishCommand(self, result):
|
|
|
"""Finish currrent command."""
|
|
|
|
|
|
# The order of these commands is absolutely critical.
|
|
|
self.currentCommand.handleResult(result)
|
|
|
self.currentCommand.finished = True
|
|
|
self._flushQueue()
|
|
|
return result
|
|
|
|
|
|
def abortCommand(self, reason):
|
|
|
"""Abort current command.
|
|
|
|
|
|
This eats the Failure but first passes it onto the Deferred that the
|
|
|
user has.
|
|
|
|
|
|
It also clear out the queue so subsequence commands don't run.
|
|
|
"""
|
|
|
|
|
|
# The order of these 3 commands is absolutely critical. The currentCommand
|
|
|
# must first be marked as finished BEFORE the queue is cleared and before
|
|
|
# the current command is sent the failure.
|
|
|
# Also, the queue must be cleared BEFORE the current command is sent the Failure
|
|
|
# otherwise the errback chain could trigger new commands to be added to the
|
|
|
# queue before we clear it. We should clear ONLY the commands that were in
|
|
|
# the queue when the error occured.
|
|
|
self.currentCommand.finished = True
|
|
|
s = "%r %r %r" % (self.currentCommand.remoteMethod, self.currentCommand.args, self.currentCommand.kwargs)
|
|
|
self.clear_queue(msg=s)
|
|
|
self.currentCommand.handleError(reason)
|
|
|
|
|
|
return None
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# IEngineCore methods
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
@queue
|
|
|
def execute(self, lines):
|
|
|
pass
|
|
|
|
|
|
@queue
|
|
|
def push(self, namespace):
|
|
|
pass
|
|
|
|
|
|
@queue
|
|
|
def pull(self, keys):
|
|
|
pass
|
|
|
|
|
|
@queue
|
|
|
def push_function(self, namespace):
|
|
|
pass
|
|
|
|
|
|
@queue
|
|
|
def pull_function(self, keys):
|
|
|
pass
|
|
|
|
|
|
def get_result(self, i=None):
|
|
|
if i is None:
|
|
|
i = max(self.history.keys()+[None])
|
|
|
|
|
|
cmd = self.history.get(i, None)
|
|
|
# Uncomment this line to disable chaching of results
|
|
|
#cmd = None
|
|
|
if cmd is None:
|
|
|
return self.submitCommand(Command('get_result', i))
|
|
|
else:
|
|
|
return defer.succeed(cmd)
|
|
|
|
|
|
def reset(self):
|
|
|
self.clear_queue()
|
|
|
self.history = {} # reset the cache - I am not sure we should do this
|
|
|
return self.submitCommand(Command('reset'))
|
|
|
|
|
|
def kill(self):
|
|
|
self.clear_queue()
|
|
|
return self.submitCommand(Command('kill'))
|
|
|
|
|
|
@queue
|
|
|
def keys(self):
|
|
|
pass
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# IEngineSerialized methods
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
@queue
|
|
|
def push_serialized(self, namespace):
|
|
|
pass
|
|
|
|
|
|
@queue
|
|
|
def pull_serialized(self, keys):
|
|
|
pass
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# IEngineProperties methods
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
@queue
|
|
|
def set_properties(self, namespace):
|
|
|
pass
|
|
|
|
|
|
@queue
|
|
|
def get_properties(self, keys=None):
|
|
|
pass
|
|
|
|
|
|
@queue
|
|
|
def del_properties(self, keys):
|
|
|
pass
|
|
|
|
|
|
@queue
|
|
|
def has_properties(self, keys):
|
|
|
pass
|
|
|
|
|
|
@queue
|
|
|
def clear_properties(self):
|
|
|
pass
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
|
# IQueuedEngine methods
|
|
|
#---------------------------------------------------------------------------
|
|
|
|
|
|
def clear_queue(self, msg=''):
|
|
|
"""Clear the queue, but doesn't cancel the currently running commmand."""
|
|
|
|
|
|
for cmd in self.queued:
|
|
|
cmd.deferred.errback(failure.Failure(error.QueueCleared(msg)))
|
|
|
self.queued = []
|
|
|
return defer.succeed(None)
|
|
|
|
|
|
def queue_status(self):
|
|
|
if self.currentCommand is not None:
|
|
|
if self.currentCommand.finished:
|
|
|
pending = repr(None)
|
|
|
else:
|
|
|
pending = repr(self.currentCommand)
|
|
|
else:
|
|
|
pending = repr(None)
|
|
|
dikt = {'queue':map(repr,self.queued), 'pending':pending}
|
|
|
return defer.succeed(dikt)
|
|
|
|
|
|
def register_failure_observer(self, obs):
|
|
|
self.failureObservers.append(obs)
|
|
|
|
|
|
def unregister_failure_observer(self, obs):
|
|
|
self.failureObservers.remove(obs)
|
|
|
|
|
|
|
|
|
# Now register QueuedEngine as an adpater class that makes an IEngineBase into a
|
|
|
# IEngineQueued.
|
|
|
components.registerAdapter(QueuedEngine, IEngineBase, IEngineQueued)
|
|
|
|
|
|
|
|
|
class Command(object):
|
|
|
"""A command object that encapslates queued commands.
|
|
|
|
|
|
This class basically keeps track of a command that has been queued
|
|
|
in a QueuedEngine. It manages the deferreds and hold the method to be called
|
|
|
and the arguments to that method.
|
|
|
"""
|
|
|
|
|
|
|
|
|
def __init__(self, remoteMethod, *args, **kwargs):
|
|
|
"""Build a new Command object."""
|
|
|
|
|
|
self.remoteMethod = remoteMethod
|
|
|
self.args = args
|
|
|
self.kwargs = kwargs
|
|
|
self.finished = False
|
|
|
|
|
|
def setDeferred(self, d):
|
|
|
"""Sets the deferred attribute of the Command."""
|
|
|
|
|
|
self.deferred = d
|
|
|
|
|
|
def __repr__(self):
|
|
|
if not self.args:
|
|
|
args = ''
|
|
|
else:
|
|
|
args = str(self.args)[1:-2] #cut off (...,)
|
|
|
for k,v in self.kwargs.iteritems():
|
|
|
if args:
|
|
|
args += ', '
|
|
|
args += '%s=%r' %(k,v)
|
|
|
return "%s(%s)" %(self.remoteMethod, args)
|
|
|
|
|
|
def handleResult(self, result):
|
|
|
"""When the result is ready, relay it to self.deferred."""
|
|
|
|
|
|
self.deferred.callback(result)
|
|
|
|
|
|
def handleError(self, reason):
|
|
|
"""When an error has occured, relay it to self.deferred."""
|
|
|
|
|
|
self.deferred.errback(reason)
|
|
|
|
|
|
class ThreadedEngineService(EngineService):
|
|
|
"""An EngineService subclass that defers execute commands to a separate
|
|
|
thread.
|
|
|
|
|
|
ThreadedEngineService uses twisted.internet.threads.deferToThread to
|
|
|
defer execute requests to a separate thread. GUI frontends may want to
|
|
|
use ThreadedEngineService as the engine in an
|
|
|
IPython.frontend.frontendbase.FrontEndBase subclass to prevent
|
|
|
block execution from blocking the GUI thread.
|
|
|
"""
|
|
|
|
|
|
zi.implements(IEngineBase)
|
|
|
|
|
|
def __init__(self, shellClass=Interpreter, mpi=None):
|
|
|
EngineService.__init__(self, shellClass, mpi)
|
|
|
|
|
|
def wrapped_execute(self, msg, lines):
|
|
|
"""Wrap self.shell.execute to add extra information to tracebacks"""
|
|
|
|
|
|
try:
|
|
|
result = self.shell.execute(lines)
|
|
|
except Exception,e:
|
|
|
# This gives the following:
|
|
|
# et=exception class
|
|
|
# ev=exception class instance
|
|
|
# tb=traceback object
|
|
|
et,ev,tb = sys.exc_info()
|
|
|
# This call adds attributes to the exception value
|
|
|
et,ev,tb = self.shell.formatTraceback(et,ev,tb,msg)
|
|
|
# Add another attribute
|
|
|
|
|
|
# Create a new exception with the new attributes
|
|
|
e = et(ev._ipython_traceback_text)
|
|
|
e._ipython_engine_info = msg
|
|
|
|
|
|
# Re-raise
|
|
|
raise e
|
|
|
|
|
|
return result
|
|
|
|
|
|
|
|
|
def execute(self, lines):
|
|
|
# Only import this if we are going to use this class
|
|
|
from twisted.internet import threads
|
|
|
|
|
|
msg = {'engineid':self.id,
|
|
|
'method':'execute',
|
|
|
'args':[lines]}
|
|
|
|
|
|
d = threads.deferToThread(self.wrapped_execute, msg, lines)
|
|
|
d.addCallback(self.addIDToResult)
|
|
|
return d
|
|
|
|
