/
error.py
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/
error.py
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# encoding: utf-8
"""Classes and functions for kernel related errors and exceptions."""
from __future__ import print_function
import sys
import traceback
__docformat__ = "restructuredtext en"
# Tell nose to skip this module
__test__ = {}
#-------------------------------------------------------------------------------
# Copyright (C) 2008 The IPython Development Team
#
# Distributed under the terms of the BSD License. The full license is in
# the file COPYING, distributed as part of this software.
#-------------------------------------------------------------------------------
#-------------------------------------------------------------------------------
# Error classes
#-------------------------------------------------------------------------------
class IPythonError(Exception):
"""Base exception that all of our exceptions inherit from.
This can be raised by code that doesn't have any more specific
information."""
pass
# Exceptions associated with the controller objects
class ControllerError(IPythonError): pass
class ControllerCreationError(ControllerError): pass
# Exceptions associated with the Engines
class EngineError(IPythonError): pass
class EngineCreationError(EngineError): pass
class KernelError(IPythonError):
pass
class NotDefined(KernelError):
def __init__(self, name):
self.name = name
self.args = (name,)
def __repr__(self):
return '<NotDefined: %s>' % self.name
__str__ = __repr__
class QueueCleared(KernelError):
pass
class IdInUse(KernelError):
pass
class ProtocolError(KernelError):
pass
class ConnectionError(KernelError):
pass
class InvalidEngineID(KernelError):
pass
class NoEnginesRegistered(KernelError):
pass
class InvalidClientID(KernelError):
pass
class InvalidDeferredID(KernelError):
pass
class SerializationError(KernelError):
pass
class MessageSizeError(KernelError):
pass
class PBMessageSizeError(MessageSizeError):
pass
class ResultNotCompleted(KernelError):
pass
class ResultAlreadyRetrieved(KernelError):
pass
class ClientError(KernelError):
pass
class TaskAborted(KernelError):
pass
class TaskTimeout(KernelError):
pass
class NotAPendingResult(KernelError):
pass
class UnpickleableException(KernelError):
pass
class AbortedPendingDeferredError(KernelError):
pass
class InvalidProperty(KernelError):
pass
class MissingBlockArgument(KernelError):
pass
class StopLocalExecution(KernelError):
pass
class SecurityError(KernelError):
pass
class FileTimeoutError(KernelError):
pass
class TimeoutError(KernelError):
pass
class UnmetDependency(KernelError):
pass
class ImpossibleDependency(UnmetDependency):
pass
class DependencyTimeout(ImpossibleDependency):
pass
class InvalidDependency(ImpossibleDependency):
pass
class RemoteError(KernelError):
"""Error raised elsewhere"""
ename=None
evalue=None
traceback=None
engine_info=None
def __init__(self, ename, evalue, traceback, engine_info=None):
self.ename=ename
self.evalue=evalue
self.traceback=traceback
self.engine_info=engine_info or {}
self.args=(ename, evalue)
def __repr__(self):
engineid = self.engine_info.get('engine_id', ' ')
return "<Remote[%s]:%s(%s)>"%(engineid, self.ename, self.evalue)
def __str__(self):
sig = "%s(%s)"%(self.ename, self.evalue)
if self.traceback:
return sig + '\n' + self.traceback
else:
return sig
class TaskRejectError(KernelError):
"""Exception to raise when a task should be rejected by an engine.
This exception can be used to allow a task running on an engine to test
if the engine (or the user's namespace on the engine) has the needed
task dependencies. If not, the task should raise this exception. For
the task to be retried on another engine, the task should be created
with the `retries` argument > 1.
The advantage of this approach over our older properties system is that
tasks have full access to the user's namespace on the engines and the
properties don't have to be managed or tested by the controller.
"""
class CompositeError(RemoteError):
"""Error for representing possibly multiple errors on engines"""
def __init__(self, message, elist):
Exception.__init__(self, *(message, elist))
# Don't use pack_exception because it will conflict with the .message
# attribute that is being deprecated in 2.6 and beyond.
self.msg = message
self.elist = elist
self.args = [ e[0] for e in elist ]
def _get_engine_str(self, ei):
if not ei:
return '[Engine Exception]'
else:
return '[%s:%s]: ' % (ei['engine_id'], ei['method'])
def _get_traceback(self, ev):
try:
tb = ev._ipython_traceback_text
except AttributeError:
return 'No traceback available'
else:
return tb
def __str__(self):
s = str(self.msg)
for en, ev, etb, ei in self.elist:
engine_str = self._get_engine_str(ei)
s = s + '\n' + engine_str + en + ': ' + str(ev)
return s
def __repr__(self):
return "CompositeError(%i)"%len(self.elist)
def print_tracebacks(self, excid=None):
if excid is None:
for (en,ev,etb,ei) in self.elist:
print (self._get_engine_str(ei))
print (etb or 'No traceback available')
print ()
else:
try:
en,ev,etb,ei = self.elist[excid]
except:
raise IndexError("an exception with index %i does not exist"%excid)
else:
print (self._get_engine_str(ei))
print (etb or 'No traceback available')
def raise_exception(self, excid=0):
try:
en,ev,etb,ei = self.elist[excid]
except:
raise IndexError("an exception with index %i does not exist"%excid)
else:
raise RemoteError(en, ev, etb, ei)
def collect_exceptions(rdict_or_list, method='unspecified'):
"""check a result dict for errors, and raise CompositeError if any exist.
Passthrough otherwise."""
elist = []
if isinstance(rdict_or_list, dict):
rlist = rdict_or_list.values()
else:
rlist = rdict_or_list
for r in rlist:
if isinstance(r, RemoteError):
en, ev, etb, ei = r.ename, r.evalue, r.traceback, r.engine_info
# Sometimes we could have CompositeError in our list. Just take
# the errors out of them and put them in our new list. This
# has the effect of flattening lists of CompositeErrors into one
# CompositeError
if en=='CompositeError':
for e in ev.elist:
elist.append(e)
else:
elist.append((en, ev, etb, ei))
if len(elist)==0:
return rdict_or_list
else:
msg = "one or more exceptions from call to method: %s" % (method)
# This silliness is needed so the debugger has access to the exception
# instance (e in this case)
try:
raise CompositeError(msg, elist)
except CompositeError as e:
raise e
def wrap_exception(engine_info={}):
etype, evalue, tb = sys.exc_info()
stb = traceback.format_exception(etype, evalue, tb)
exc_content = {
'status' : 'error',
'traceback' : stb,
'ename' : unicode(etype.__name__),
'evalue' : unicode(evalue),
'engine_info' : engine_info
}
return exc_content
def unwrap_exception(content):
err = RemoteError(content['ename'], content['evalue'],
''.join(content['traceback']),
content.get('engine_info', {}))
return err