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# encoding: utf-8
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"""Classes and functions for kernel related errors and exceptions.
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Inheritance diagram:
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.. inheritance-diagram:: IPython.parallel.error
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:parts: 3
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Authors:
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* Brian Granger
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* Min RK
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"""
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from __future__ import print_function
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import sys
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import traceback
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from IPython.utils.py3compat import unicode_type
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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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# Error classes
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#-------------------------------------------------------------------------------
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class IPythonError(Exception):
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"""Base exception that all of our exceptions inherit from.
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This can be raised by code that doesn't have any more specific
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information."""
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pass
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class KernelError(IPythonError):
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pass
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class EngineError(KernelError):
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pass
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class NoEnginesRegistered(KernelError):
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pass
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class TaskAborted(KernelError):
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pass
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class TaskTimeout(KernelError):
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pass
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class TimeoutError(KernelError):
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pass
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class UnmetDependency(KernelError):
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pass
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class ImpossibleDependency(UnmetDependency):
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pass
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class DependencyTimeout(ImpossibleDependency):
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pass
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class InvalidDependency(ImpossibleDependency):
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pass
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class RemoteError(KernelError):
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"""Error raised elsewhere"""
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ename=None
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evalue=None
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traceback=None
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engine_info=None
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def __init__(self, ename, evalue, traceback, engine_info=None):
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self.ename=ename
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self.evalue=evalue
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self.traceback=traceback
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self.engine_info=engine_info or {}
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self.args=(ename, evalue)
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def __repr__(self):
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engineid = self.engine_info.get('engine_id', ' ')
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return "<Remote[%s]:%s(%s)>"%(engineid, self.ename, self.evalue)
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def __str__(self):
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return "%s(%s)" % (self.ename, self.evalue)
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def render_traceback(self):
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"""render traceback to a list of lines"""
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return (self.traceback or "No traceback available").splitlines()
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def _render_traceback_(self):
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"""Special method for custom tracebacks within IPython.
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This will be called by IPython instead of displaying the local traceback.
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It should return a traceback rendered as a list of lines.
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"""
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return self.render_traceback()
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def print_traceback(self, excid=None):
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"""print my traceback"""
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print('\n'.join(self.render_traceback()))
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class TaskRejectError(KernelError):
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"""Exception to raise when a task should be rejected by an engine.
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This exception can be used to allow a task running on an engine to test
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if the engine (or the user's namespace on the engine) has the needed
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task dependencies. If not, the task should raise this exception. For
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the task to be retried on another engine, the task should be created
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with the `retries` argument > 1.
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The advantage of this approach over our older properties system is that
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tasks have full access to the user's namespace on the engines and the
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properties don't have to be managed or tested by the controller.
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"""
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class CompositeError(RemoteError):
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"""Error for representing possibly multiple errors on engines"""
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tb_limit = 4 # limit on how many tracebacks to draw
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def __init__(self, message, elist):
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Exception.__init__(self, *(message, elist))
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# Don't use pack_exception because it will conflict with the .message
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# attribute that is being deprecated in 2.6 and beyond.
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self.msg = message
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self.elist = elist
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self.args = [ e[0] for e in elist ]
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def _get_engine_str(self, ei):
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if not ei:
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return '[Engine Exception]'
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else:
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return '[%s:%s]: ' % (ei['engine_id'], ei['method'])
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def _get_traceback(self, ev):
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try:
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tb = ev._ipython_traceback_text
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except AttributeError:
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return 'No traceback available'
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else:
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return tb
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def __str__(self):
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s = str(self.msg)
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for en, ev, etb, ei in self.elist[:self.tb_limit]:
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engine_str = self._get_engine_str(ei)
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s = s + '\n' + engine_str + en + ': ' + str(ev)
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if len(self.elist) > self.tb_limit:
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s = s + '\n.... %i more exceptions ...' % (len(self.elist) - self.tb_limit)
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return s
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def __repr__(self):
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return "CompositeError(%i)" % len(self.elist)
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def render_traceback(self, excid=None):
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"""render one or all of my tracebacks to a list of lines"""
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lines = []
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if excid is None:
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for (en,ev,etb,ei) in self.elist[:self.tb_limit]:
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lines.append(self._get_engine_str(ei))
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lines.extend((etb or 'No traceback available').splitlines())
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lines.append('')
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if len(self.elist) > self.tb_limit:
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lines.append(
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'... %i more exceptions ...' % (len(self.elist) - self.tb_limit)
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)
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else:
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try:
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en,ev,etb,ei = self.elist[excid]
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except:
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raise IndexError("an exception with index %i does not exist"%excid)
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else:
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lines.append(self._get_engine_str(ei))
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lines.extend((etb or 'No traceback available').splitlines())
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return lines
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def print_traceback(self, excid=None):
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print('\n'.join(self.render_traceback(excid)))
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def raise_exception(self, excid=0):
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try:
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en,ev,etb,ei = self.elist[excid]
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except:
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raise IndexError("an exception with index %i does not exist"%excid)
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else:
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raise RemoteError(en, ev, etb, ei)
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def collect_exceptions(rdict_or_list, method='unspecified'):
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"""check a result dict for errors, and raise CompositeError if any exist.
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Passthrough otherwise."""
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elist = []
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if isinstance(rdict_or_list, dict):
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rlist = rdict_or_list.values()
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else:
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rlist = rdict_or_list
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for r in rlist:
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if isinstance(r, RemoteError):
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en, ev, etb, ei = r.ename, r.evalue, r.traceback, r.engine_info
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# Sometimes we could have CompositeError in our list. Just take
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# the errors out of them and put them in our new list. This
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# has the effect of flattening lists of CompositeErrors into one
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# CompositeError
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if en=='CompositeError':
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for e in ev.elist:
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elist.append(e)
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else:
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elist.append((en, ev, etb, ei))
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if len(elist)==0:
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return rdict_or_list
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else:
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msg = "one or more exceptions from call to method: %s" % (method)
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# This silliness is needed so the debugger has access to the exception
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# instance (e in this case)
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try:
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raise CompositeError(msg, elist)
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except CompositeError as e:
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raise e
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def wrap_exception(engine_info={}):
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etype, evalue, tb = sys.exc_info()
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stb = traceback.format_exception(etype, evalue, tb)
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exc_content = {
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'status' : 'error',
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'traceback' : stb,
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'ename' : unicode_type(etype.__name__),
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'evalue' : unicode_type(evalue),
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'engine_info' : engine_info
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}
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return exc_content
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def unwrap_exception(content):
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err = RemoteError(content['ename'], content['evalue'],
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''.join(content['traceback']),
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content.get('engine_info', {}))
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return err
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