137 lines
3.8 KiB
Python
137 lines
3.8 KiB
Python
|
# -*- coding: utf-8 -*-
|
||
|
|
# copyright 2018 gevent
|
||
|
|
"""
|
||
|
|
Exceptions.
|
||
|
|
|
||
|
|
.. versionadded:: 1.3b1
|
||
|
|
|
||
|
|
"""
|
||
|
|
from __future__ import absolute_import
|
||
|
|
from __future__ import division
|
||
|
|
from __future__ import print_function
|
||
|
|
|
||
|
|
from greenlet import GreenletExit
|
||
|
|
|
||
|
|
__all__ = [
|
||
|
|
'LoopExit',
|
||
|
|
]
|
||
|
|
|
||
|
|
|
||
|
|
class LoopExit(Exception):
|
||
|
|
"""
|
||
|
|
Exception thrown when the hub finishes running (`gevent.hub.Hub.run`
|
||
|
|
would return).
|
||
|
|
|
||
|
|
In a normal application, this is never thrown or caught
|
||
|
|
explicitly. The internal implementation of functions like
|
||
|
|
:meth:`gevent.hub.Hub.join` and :func:`gevent.joinall` may catch it, but user code
|
||
|
|
generally should not.
|
||
|
|
|
||
|
|
.. caution::
|
||
|
|
Errors in application programming can also lead to this exception being
|
||
|
|
raised. Some examples include (but are not limited too):
|
||
|
|
|
||
|
|
- greenlets deadlocking on a lock;
|
||
|
|
- using a socket or other gevent object with native thread
|
||
|
|
affinity from a different thread
|
||
|
|
|
||
|
|
"""
|
||
|
|
|
||
|
|
@property
|
||
|
|
def hub(self):
|
||
|
|
"""
|
||
|
|
The (optional) hub that raised the error.
|
||
|
|
|
||
|
|
.. versionadded:: 20.12.0
|
||
|
|
"""
|
||
|
|
# XXX: Note that semaphore.py does this manually.
|
||
|
|
if len(self.args) == 3: # From the hub
|
||
|
|
return self.args[1]
|
||
|
|
|
||
|
|
def __repr__(self):
|
||
|
|
# pylint:disable=unsubscriptable-object
|
||
|
|
if len(self.args) == 3: # From the hub
|
||
|
|
import pprint
|
||
|
|
return (
|
||
|
|
"%s\n"
|
||
|
|
"\tHub: %s\n"
|
||
|
|
"\tHandles:\n%s"
|
||
|
|
) % (
|
||
|
|
self.args[0],
|
||
|
|
self.args[1],
|
||
|
|
pprint.pformat(self.args[2])
|
||
|
|
)
|
||
|
|
return Exception.__repr__(self)
|
||
|
|
|
||
|
|
def __str__(self):
|
||
|
|
return repr(self)
|
||
|
|
|
||
|
|
class BlockingSwitchOutError(AssertionError):
|
||
|
|
"""
|
||
|
|
Raised when a gevent synchronous function is called from a
|
||
|
|
low-level event loop callback.
|
||
|
|
|
||
|
|
This is usually a programming error.
|
||
|
|
"""
|
||
|
|
|
||
|
|
|
||
|
|
class InvalidSwitchError(AssertionError):
|
||
|
|
"""
|
||
|
|
Raised when the event loop returns control to a greenlet in an
|
||
|
|
unexpected way.
|
||
|
|
|
||
|
|
This is usually a bug in gevent, greenlet, or the event loop.
|
||
|
|
"""
|
||
|
|
|
||
|
|
class ConcurrentObjectUseError(AssertionError):
|
||
|
|
"""
|
||
|
|
Raised when an object is used (waited on) by two greenlets
|
||
|
|
independently, meaning the object was entered into a blocking
|
||
|
|
state by one greenlet and then another while still blocking in the
|
||
|
|
first one.
|
||
|
|
|
||
|
|
This is usually a programming error.
|
||
|
|
|
||
|
|
.. seealso:: `gevent.socket.wait`
|
||
|
|
"""
|
||
|
|
|
||
|
|
class InvalidThreadUseError(RuntimeError):
|
||
|
|
"""
|
||
|
|
Raised when an object is used from a different thread than
|
||
|
|
the one it is bound to.
|
||
|
|
|
||
|
|
Some objects, such as gevent sockets, semaphores, and threadpools,
|
||
|
|
are tightly bound to their hub and its loop. The hub and loop
|
||
|
|
are not thread safe, with a few exceptions. Attempting to use
|
||
|
|
such objects from a different thread is an error, and may cause
|
||
|
|
problems ranging from incorrect results to memory corruption
|
||
|
|
and a crashed process.
|
||
|
|
|
||
|
|
In some cases, gevent catches this "accidentally", and the result is
|
||
|
|
a `LoopExit`. In some cases, gevent doesn't catch this at all.
|
||
|
|
|
||
|
|
In other cases (typically when the consequences are suspected to
|
||
|
|
be more on the more severe end of the scale, and when the operation in
|
||
|
|
question is already relatively heavyweight), gevent explicitly checks
|
||
|
|
for this usage and will raise this exception when it is detected.
|
||
|
|
|
||
|
|
.. versionadded:: 1.5a3
|
||
|
|
"""
|
||
|
|
|
||
|
|
|
||
|
|
class HubDestroyed(GreenletExit):
|
||
|
|
"""
|
||
|
|
Internal exception, raised when we're trying to destroy the
|
||
|
|
hub and we want the loop to stop running callbacks now.
|
||
|
|
|
||
|
|
This must not be subclassed; the type is tested by identity.
|
||
|
|
|
||
|
|
Clients outside of gevent must not raise this exception.
|
||
|
|
|
||
|
|
.. versionadded:: 20.12.0
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, destroy_loop):
|
||
|
|
GreenletExit.__init__(self, destroy_loop)
|
||
|
|
self.destroy_loop = destroy_loop
|