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"""AsyncResult objects for the client
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Authors:
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* MinRK
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2010-2011 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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import time
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from zmq import MessageTracker
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from IPython.external.decorator import decorator
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from IPython.parallel import error
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#-----------------------------------------------------------------------------
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# Classes
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#-----------------------------------------------------------------------------
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# global empty tracker that's always done:
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finished_tracker = MessageTracker()
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@decorator
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def check_ready(f, self, *args, **kwargs):
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"""Call spin() to sync state prior to calling the method."""
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self.wait(0)
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if not self._ready:
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raise error.TimeoutError("result not ready")
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return f(self, *args, **kwargs)
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class AsyncResult(object):
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"""Class for representing results of non-blocking calls.
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Provides the same interface as :py:class:`multiprocessing.pool.AsyncResult`.
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"""
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msg_ids = None
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_targets = None
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_tracker = None
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_single_result = False
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def __init__(self, client, msg_ids, fname='unknown', targets=None, tracker=None):
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if isinstance(msg_ids, basestring):
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# always a list
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msg_ids = [msg_ids]
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if tracker is None:
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# default to always done
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tracker = finished_tracker
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self._client = client
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self.msg_ids = msg_ids
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self._fname=fname
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self._targets = targets
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self._tracker = tracker
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self._ready = False
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self._success = None
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self._metadata = None
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if len(msg_ids) == 1:
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self._single_result = not isinstance(targets, (list, tuple))
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else:
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self._single_result = False
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def __repr__(self):
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if self._ready:
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return "<%s: finished>"%(self.__class__.__name__)
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else:
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return "<%s: %s>"%(self.__class__.__name__,self._fname)
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def _reconstruct_result(self, res):
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"""Reconstruct our result from actual result list (always a list)
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Override me in subclasses for turning a list of results
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into the expected form.
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"""
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if self._single_result:
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return res[0]
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else:
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return res
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def get(self, timeout=-1):
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"""Return the result when it arrives.
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If `timeout` is not ``None`` and the result does not arrive within
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`timeout` seconds then ``TimeoutError`` is raised. If the
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remote call raised an exception then that exception will be reraised
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by get() inside a `RemoteError`.
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"""
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if not self.ready():
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self.wait(timeout)
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if self._ready:
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if self._success:
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return self._result
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else:
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raise self._exception
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else:
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raise error.TimeoutError("Result not ready.")
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def ready(self):
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"""Return whether the call has completed."""
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if not self._ready:
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self.wait(0)
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return self._ready
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def wait(self, timeout=-1):
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"""Wait until the result is available or until `timeout` seconds pass.
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This method always returns None.
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"""
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if self._ready:
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return
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self._ready = self._client.wait(self.msg_ids, timeout)
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if self._ready:
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try:
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results = map(self._client.results.get, self.msg_ids)
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self._result = results
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if self._single_result:
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r = results[0]
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if isinstance(r, Exception):
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raise r
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else:
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results = error.collect_exceptions(results, self._fname)
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self._result = self._reconstruct_result(results)
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except Exception, e:
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self._exception = e
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self._success = False
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else:
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self._success = True
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finally:
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self._metadata = map(self._client.metadata.get, self.msg_ids)
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def successful(self):
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"""Return whether the call completed without raising an exception.
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Will raise ``AssertionError`` if the result is not ready.
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"""
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assert self.ready()
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return self._success
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#----------------------------------------------------------------
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# Extra methods not in mp.pool.AsyncResult
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#----------------------------------------------------------------
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def get_dict(self, timeout=-1):
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"""Get the results as a dict, keyed by engine_id.
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timeout behavior is described in `get()`.
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"""
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results = self.get(timeout)
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engine_ids = [ md['engine_id'] for md in self._metadata ]
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bycount = sorted(engine_ids, key=lambda k: engine_ids.count(k))
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maxcount = bycount.count(bycount[-1])
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if maxcount > 1:
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raise ValueError("Cannot build dict, %i jobs ran on engine #%i"%(
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maxcount, bycount[-1]))
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return dict(zip(engine_ids,results))
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@property
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def result(self):
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"""result property wrapper for `get(timeout=0)`."""
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return self.get()
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# abbreviated alias:
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r = result
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@property
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@check_ready
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def metadata(self):
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"""property for accessing execution metadata."""
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if self._single_result:
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return self._metadata[0]
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else:
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return self._metadata
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@property
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def result_dict(self):
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"""result property as a dict."""
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return self.get_dict()
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def __dict__(self):
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return self.get_dict(0)
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def abort(self):
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"""abort my tasks."""
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assert not self.ready(), "Can't abort, I am already done!"
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return self.client.abort(self.msg_ids, targets=self._targets, block=True)
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@property
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def sent(self):
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"""check whether my messages have been sent."""
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return self._tracker.done
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def wait_for_send(self, timeout=-1):
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"""wait for pyzmq send to complete.
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This is necessary when sending arrays that you intend to edit in-place.
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`timeout` is in seconds, and will raise TimeoutError if it is reached
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before the send completes.
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"""
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return self._tracker.wait(timeout)
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#-------------------------------------
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# dict-access
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#-------------------------------------
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@check_ready
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def __getitem__(self, key):
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"""getitem returns result value(s) if keyed by int/slice, or metadata if key is str.
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"""
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if isinstance(key, int):
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return error.collect_exceptions([self._result[key]], self._fname)[0]
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elif isinstance(key, slice):
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return error.collect_exceptions(self._result[key], self._fname)
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elif isinstance(key, basestring):
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values = [ md[key] for md in self._metadata ]
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if self._single_result:
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return values[0]
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else:
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return values
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else:
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raise TypeError("Invalid key type %r, must be 'int','slice', or 'str'"%type(key))
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def __getattr__(self, key):
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"""getattr maps to getitem for convenient attr access to metadata."""
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try:
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return self.__getitem__(key)
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except (error.TimeoutError, KeyError):
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raise AttributeError("%r object has no attribute %r"%(
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self.__class__.__name__, key))
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# asynchronous iterator:
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def __iter__(self):
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if self._single_result:
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raise TypeError("AsyncResults with a single result are not iterable.")
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try:
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rlist = self.get(0)
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except error.TimeoutError:
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# wait for each result individually
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for msg_id in self.msg_ids:
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ar = AsyncResult(self._client, msg_id, self._fname)
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yield ar.get()
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else:
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# already done
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for r in rlist:
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yield r
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class AsyncMapResult(AsyncResult):
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"""Class for representing results of non-blocking gathers.
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This will properly reconstruct the gather.
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This class is iterable at any time, and will wait on results as they come.
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If ordered=False, then the first results to arrive will come first, otherwise
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results will be yielded in the order they were submitted.
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"""
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def __init__(self, client, msg_ids, mapObject, fname='', ordered=True):
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AsyncResult.__init__(self, client, msg_ids, fname=fname)
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self._mapObject = mapObject
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self._single_result = False
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self.ordered = ordered
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def _reconstruct_result(self, res):
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"""Perform the gather on the actual results."""
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return self._mapObject.joinPartitions(res)
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# asynchronous iterator:
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def __iter__(self):
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it = self._ordered_iter if self.ordered else self._unordered_iter
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for r in it():
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yield r
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# asynchronous ordered iterator:
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def _ordered_iter(self):
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"""iterator for results *as they arrive*, preserving submission order."""
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try:
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rlist = self.get(0)
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except error.TimeoutError:
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# wait for each result individually
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for msg_id in self.msg_ids:
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ar = AsyncResult(self._client, msg_id, self._fname)
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rlist = ar.get()
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try:
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for r in rlist:
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yield r
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except TypeError:
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# flattened, not a list
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# this could get broken by flattened data that returns iterables
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# but most calls to map do not expose the `flatten` argument
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yield rlist
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else:
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# already done
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for r in rlist:
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yield r
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# asynchronous unordered iterator:
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def _unordered_iter(self):
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"""iterator for results *as they arrive*, on FCFS basis, ignoring submission order."""
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try:
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rlist = self.get(0)
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except error.TimeoutError:
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pending = set(self.msg_ids)
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while pending:
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try:
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self._client.wait(pending, 1e-3)
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except error.TimeoutError:
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# ignore timeout error, because that only means
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# *some* jobs are outstanding
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pass
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# update ready set with those no longer outstanding:
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ready = pending.difference(self._client.outstanding)
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# update pending to exclude those that are finished
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pending = pending.difference(ready)
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while ready:
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msg_id = ready.pop()
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ar = AsyncResult(self._client, msg_id, self._fname)
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rlist = ar.get()
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try:
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for r in rlist:
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yield r
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except TypeError:
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# flattened, not a list
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# this could get broken by flattened data that returns iterables
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# but most calls to map do not expose the `flatten` argument
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yield rlist
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else:
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# already done
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for r in rlist:
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yield r
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class AsyncHubResult(AsyncResult):
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"""Class to wrap pending results that must be requested from the Hub.
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Note that waiting/polling on these objects requires polling the Hubover the network,
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so use `AsyncHubResult.wait()` sparingly.
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"""
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def wait(self, timeout=-1):
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"""wait for result to complete."""
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start = time.time()
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if self._ready:
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return
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local_ids = filter(lambda msg_id: msg_id in self._client.outstanding, self.msg_ids)
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local_ready = self._client.wait(local_ids, timeout)
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if local_ready:
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remote_ids = filter(lambda msg_id: msg_id not in self._client.results, self.msg_ids)
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if not remote_ids:
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self._ready = True
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else:
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rdict = self._client.result_status(remote_ids, status_only=False)
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pending = rdict['pending']
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while pending and (timeout < 0 or time.time() < start+timeout):
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rdict = self._client.result_status(remote_ids, status_only=False)
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pending = rdict['pending']
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if pending:
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time.sleep(0.1)
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if not pending:
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self._ready = True
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if self._ready:
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try:
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results = map(self._client.results.get, self.msg_ids)
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self._result = results
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if self._single_result:
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r = results[0]
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if isinstance(r, Exception):
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raise r
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else:
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results = error.collect_exceptions(results, self._fname)
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self._result = self._reconstruct_result(results)
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except Exception, e:
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self._exception = e
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self._success = False
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else:
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self._success = True
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finally:
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self._metadata = map(self._client.metadata.get, self.msg_ids)
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__all__ = ['AsyncResult', 'AsyncMapResult', 'AsyncHubResult']
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