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"""
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Base front end class for all async frontends.
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"""
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__docformat__ = "restructuredtext en"
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# Tell nose to skip this module
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__test__ = {}
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#-------------------------------------------------------------------------------
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# Copyright (C) 2008-2011 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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# Third-party
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from twisted.python.failure import Failure
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from zope.interface import implements, classProvides
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# From IPython
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from IPython.external import guid
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from IPython.frontend.frontendbase import (FrontEndBase, IFrontEnd,
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IFrontEndFactory)
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from IPython.kernel.core.history import FrontEndHistory
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from IPython.kernel.engineservice import IEngineCore
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#-----------------------------------------------------------------------------
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# Classes and functions
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#-----------------------------------------------------------------------------
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class AsyncFrontEndBase(FrontEndBase):
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"""
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Overrides FrontEndBase to wrap execute in a deferred result.
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All callbacks are made as callbacks on the deferred result.
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"""
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implements(IFrontEnd)
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classProvides(IFrontEndFactory)
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def __init__(self, engine=None, history=None):
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assert(engine==None or IEngineCore.providedBy(engine))
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self.engine = IEngineCore(engine)
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if history is None:
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self.history = FrontEndHistory(input_cache=[''])
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else:
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self.history = history
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def execute(self, block, blockID=None):
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"""Execute the block and return the deferred result.
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Parameters:
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block : {str, AST}
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blockID : any
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Caller may provide an ID to identify this block.
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result['blockID'] := blockID
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Result:
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Deferred result of self.interpreter.execute
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"""
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if(not self.is_complete(block)):
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return Failure(Exception("Block is not compilable"))
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if(blockID == None):
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blockID = guid.generate()
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d = self.engine.execute(block)
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d.addCallback(self._add_history, block=block)
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d.addCallbacks(self._add_block_id_for_result,
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errback=self._add_block_id_for_failure,
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callbackArgs=(blockID,),
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errbackArgs=(blockID,))
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d.addBoth(self.update_cell_prompt, blockID=blockID)
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d.addCallbacks(self.render_result,
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errback=self.render_error)
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return d
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