You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
481 lines
15 KiB
481 lines
15 KiB
# -*- coding: utf-8 -*-
|
|
# Copyright 2018 gevent. See LICENSE for details.
|
|
"""
|
|
Publish/subscribe event infrastructure.
|
|
|
|
When certain "interesting" things happen during the lifetime of the
|
|
process, gevent will "publish" an event (an object). That event is
|
|
delivered to interested "subscribers" (functions that take one
|
|
parameter, the event object).
|
|
|
|
Higher level frameworks may take this foundation and build richer
|
|
models on it.
|
|
|
|
If :mod:`zope.event` is installed, then it will be used to provide the
|
|
functionality of `notify` and `subscribers`. See
|
|
:mod:`zope.event.classhandler` for a simple class-based approach to
|
|
subscribing to a filtered list of events, and see `zope.component
|
|
<https://zopecomponent.readthedocs.io/en/latest/event.html>`_ for a
|
|
much higher-level, flexible system. If you are using one of these systems,
|
|
you generally will not want to directly modify `subscribers`.
|
|
|
|
.. versionadded:: 1.3b1
|
|
"""
|
|
from __future__ import absolute_import
|
|
from __future__ import division
|
|
from __future__ import print_function
|
|
|
|
|
|
__all__ = [
|
|
'subscribers',
|
|
|
|
# monitor thread
|
|
'IEventLoopBlocked',
|
|
'EventLoopBlocked',
|
|
'IMemoryUsageThresholdExceeded',
|
|
'MemoryUsageThresholdExceeded',
|
|
'IMemoryUsageUnderThreshold',
|
|
'MemoryUsageUnderThreshold',
|
|
|
|
# Hub
|
|
'IPeriodicMonitorThread',
|
|
'IPeriodicMonitorThreadStartedEvent',
|
|
'PeriodicMonitorThreadStartedEvent',
|
|
|
|
# monkey
|
|
'IGeventPatchEvent',
|
|
'GeventPatchEvent',
|
|
'IGeventWillPatchEvent',
|
|
'DoNotPatch',
|
|
'GeventWillPatchEvent',
|
|
'IGeventDidPatchEvent',
|
|
'IGeventWillPatchModuleEvent',
|
|
'GeventWillPatchModuleEvent',
|
|
'IGeventDidPatchModuleEvent',
|
|
'GeventDidPatchModuleEvent',
|
|
'IGeventWillPatchAllEvent',
|
|
'GeventWillPatchAllEvent',
|
|
'IGeventDidPatchBuiltinModulesEvent',
|
|
'GeventDidPatchBuiltinModulesEvent',
|
|
'IGeventDidPatchAllEvent',
|
|
'GeventDidPatchAllEvent',
|
|
]
|
|
|
|
# pylint:disable=no-self-argument
|
|
|
|
try:
|
|
from zope.event import subscribers
|
|
from zope.event import notify
|
|
except ImportError:
|
|
#: Applications may register for notification of events by appending a
|
|
#: callable to the ``subscribers`` list.
|
|
#:
|
|
#: Each subscriber takes a single argument, which is the event object
|
|
#: being published.
|
|
#:
|
|
#: Exceptions raised by subscribers will be propagated *without* running
|
|
#: any remaining subscribers.
|
|
subscribers = []
|
|
|
|
def notify(event):
|
|
"""
|
|
Notify all subscribers of ``event``.
|
|
"""
|
|
for subscriber in subscribers:
|
|
subscriber(event)
|
|
|
|
notify = notify # export
|
|
try:
|
|
# pkg_resources is technically optional, we don't
|
|
# list a hard dependency on it.
|
|
__import__('pkg_resources')
|
|
except ImportError:
|
|
notify_and_call_entry_points = notify
|
|
else:
|
|
from pkg_resources import iter_entry_points
|
|
import platform
|
|
try:
|
|
# Cache the platform info. pkg_resources uses
|
|
# platform.machine() for environment markers, and
|
|
# platform.machine() wants to call os.popen('uname'), which is
|
|
# broken on Py2 when the gevent child signal handler is
|
|
# installed. (see test__monkey_sigchild_2.py)
|
|
platform.uname()
|
|
except: # pylint:disable=bare-except
|
|
pass
|
|
finally:
|
|
del platform
|
|
|
|
def notify_and_call_entry_points(event):
|
|
notify(event)
|
|
for plugin in iter_entry_points(event.ENTRY_POINT_NAME):
|
|
subscriber = plugin.load()
|
|
subscriber(event)
|
|
|
|
from gevent._util import Interface
|
|
from gevent._util import implementer
|
|
from gevent._util import Attribute
|
|
|
|
|
|
class IPeriodicMonitorThread(Interface):
|
|
"""
|
|
The contract for the periodic monitoring thread that is started
|
|
by the hub.
|
|
"""
|
|
|
|
def add_monitoring_function(function, period):
|
|
"""
|
|
Schedule the *function* to be called approximately every *period* fractional seconds.
|
|
|
|
The *function* receives one argument, the hub being monitored. It is called
|
|
in the monitoring thread, *not* the hub thread. It **must not** attempt to
|
|
use the gevent asynchronous API.
|
|
|
|
If the *function* is already a monitoring function, then its *period*
|
|
will be updated for future runs.
|
|
|
|
If the *period* is ``None``, then the function will be removed.
|
|
|
|
A *period* less than or equal to zero is not allowed.
|
|
"""
|
|
|
|
class IPeriodicMonitorThreadStartedEvent(Interface):
|
|
"""
|
|
The event emitted when a hub starts a periodic monitoring thread.
|
|
|
|
You can use this event to add additional monitoring functions.
|
|
"""
|
|
|
|
monitor = Attribute("The instance of `IPeriodicMonitorThread` that was started.")
|
|
|
|
class PeriodicMonitorThreadStartedEvent(object):
|
|
"""
|
|
The implementation of :class:`IPeriodicMonitorThreadStartedEvent`.
|
|
"""
|
|
|
|
#: The name of the setuptools entry point that is called when this
|
|
#: event is emitted.
|
|
ENTRY_POINT_NAME = 'gevent.plugins.hub.periodic_monitor_thread_started'
|
|
|
|
def __init__(self, monitor):
|
|
self.monitor = monitor
|
|
|
|
class IEventLoopBlocked(Interface):
|
|
"""
|
|
The event emitted when the event loop is blocked.
|
|
|
|
This event is emitted in the monitor thread.
|
|
"""
|
|
|
|
greenlet = Attribute("The greenlet that appeared to be blocking the loop.")
|
|
blocking_time = Attribute("The approximate time in seconds the loop has been blocked.")
|
|
info = Attribute("A sequence of string lines providing extra info.")
|
|
|
|
@implementer(IEventLoopBlocked)
|
|
class EventLoopBlocked(object):
|
|
"""
|
|
The event emitted when the event loop is blocked.
|
|
|
|
Implements `IEventLoopBlocked`.
|
|
"""
|
|
|
|
def __init__(self, greenlet, blocking_time, info):
|
|
self.greenlet = greenlet
|
|
self.blocking_time = blocking_time
|
|
self.info = info
|
|
|
|
class IMemoryUsageThresholdExceeded(Interface):
|
|
"""
|
|
The event emitted when the memory usage threshold is exceeded.
|
|
|
|
This event is emitted only while memory continues to grow
|
|
above the threshold. Only if the condition or stabilized is corrected (memory
|
|
usage drops) will the event be emitted in the future.
|
|
|
|
This event is emitted in the monitor thread.
|
|
"""
|
|
|
|
mem_usage = Attribute("The current process memory usage, in bytes.")
|
|
max_allowed = Attribute("The maximum allowed memory usage, in bytes.")
|
|
memory_info = Attribute("The tuple of memory usage stats return by psutil.")
|
|
|
|
class _AbstractMemoryEvent(object):
|
|
|
|
def __init__(self, mem_usage, max_allowed, memory_info):
|
|
self.mem_usage = mem_usage
|
|
self.max_allowed = max_allowed
|
|
self.memory_info = memory_info
|
|
|
|
def __repr__(self):
|
|
return "<%s used=%d max=%d details=%r>" % (
|
|
self.__class__.__name__,
|
|
self.mem_usage,
|
|
self.max_allowed,
|
|
self.memory_info,
|
|
)
|
|
|
|
@implementer(IMemoryUsageThresholdExceeded)
|
|
class MemoryUsageThresholdExceeded(_AbstractMemoryEvent):
|
|
"""
|
|
Implementation of `IMemoryUsageThresholdExceeded`.
|
|
"""
|
|
|
|
|
|
class IMemoryUsageUnderThreshold(Interface):
|
|
"""
|
|
The event emitted when the memory usage drops below the
|
|
threshold after having previously been above it.
|
|
|
|
This event is emitted only the first time memory usage is detected
|
|
to be below the threshold after having previously been above it.
|
|
If memory usage climbs again, a `IMemoryUsageThresholdExceeded`
|
|
event will be broadcast, and then this event could be broadcast again.
|
|
|
|
This event is emitted in the monitor thread.
|
|
"""
|
|
|
|
mem_usage = Attribute("The current process memory usage, in bytes.")
|
|
max_allowed = Attribute("The maximum allowed memory usage, in bytes.")
|
|
max_memory_usage = Attribute("The memory usage that caused the previous "
|
|
"IMemoryUsageThresholdExceeded event.")
|
|
memory_info = Attribute("The tuple of memory usage stats return by psutil.")
|
|
|
|
|
|
@implementer(IMemoryUsageUnderThreshold)
|
|
class MemoryUsageUnderThreshold(_AbstractMemoryEvent):
|
|
"""
|
|
Implementation of `IMemoryUsageUnderThreshold`.
|
|
"""
|
|
|
|
def __init__(self, mem_usage, max_allowed, memory_info, max_usage):
|
|
super(MemoryUsageUnderThreshold, self).__init__(mem_usage, max_allowed, memory_info)
|
|
self.max_memory_usage = max_usage
|
|
|
|
|
|
class IGeventPatchEvent(Interface):
|
|
"""
|
|
The root for all monkey-patch events gevent emits.
|
|
"""
|
|
|
|
source = Attribute("The source object containing the patches.")
|
|
target = Attribute("The destination object to be patched.")
|
|
|
|
@implementer(IGeventPatchEvent)
|
|
class GeventPatchEvent(object):
|
|
"""
|
|
Implementation of `IGeventPatchEvent`.
|
|
"""
|
|
|
|
def __init__(self, source, target):
|
|
self.source = source
|
|
self.target = target
|
|
|
|
def __repr__(self):
|
|
return '<%s source=%r target=%r at %x>' % (self.__class__.__name__,
|
|
self.source,
|
|
self.target,
|
|
id(self))
|
|
|
|
class IGeventWillPatchEvent(IGeventPatchEvent):
|
|
"""
|
|
An event emitted *before* gevent monkey-patches something.
|
|
|
|
If a subscriber raises `DoNotPatch`, then patching this particular
|
|
item will not take place.
|
|
"""
|
|
|
|
|
|
class DoNotPatch(BaseException):
|
|
"""
|
|
Subscribers to will-patch events can raise instances
|
|
of this class to tell gevent not to patch that particular item.
|
|
"""
|
|
|
|
|
|
@implementer(IGeventWillPatchEvent)
|
|
class GeventWillPatchEvent(GeventPatchEvent):
|
|
"""
|
|
Implementation of `IGeventWillPatchEvent`.
|
|
"""
|
|
|
|
class IGeventDidPatchEvent(IGeventPatchEvent):
|
|
"""
|
|
An event emitted *after* gevent has patched something.
|
|
"""
|
|
|
|
@implementer(IGeventDidPatchEvent)
|
|
class GeventDidPatchEvent(GeventPatchEvent):
|
|
"""
|
|
Implementation of `IGeventDidPatchEvent`.
|
|
"""
|
|
|
|
class IGeventWillPatchModuleEvent(IGeventWillPatchEvent):
|
|
"""
|
|
An event emitted *before* gevent begins patching a specific module.
|
|
|
|
Both *source* and *target* attributes are module objects.
|
|
"""
|
|
|
|
module_name = Attribute("The name of the module being patched. "
|
|
"This is the same as ``target.__name__``.")
|
|
|
|
target_item_names = Attribute("The list of item names to patch. "
|
|
"This can be modified in place with caution.")
|
|
|
|
@implementer(IGeventWillPatchModuleEvent)
|
|
class GeventWillPatchModuleEvent(GeventWillPatchEvent):
|
|
"""
|
|
Implementation of `IGeventWillPatchModuleEvent`.
|
|
"""
|
|
|
|
#: The name of the setuptools entry point that is called when this
|
|
#: event is emitted.
|
|
ENTRY_POINT_NAME = 'gevent.plugins.monkey.will_patch_module'
|
|
|
|
def __init__(self, module_name, source, target, items):
|
|
super(GeventWillPatchModuleEvent, self).__init__(source, target)
|
|
self.module_name = module_name
|
|
self.target_item_names = items
|
|
|
|
|
|
class IGeventDidPatchModuleEvent(IGeventDidPatchEvent):
|
|
"""
|
|
An event emitted *after* gevent has completed patching a specific
|
|
module.
|
|
"""
|
|
|
|
module_name = Attribute("The name of the module being patched. "
|
|
"This is the same as ``target.__name__``.")
|
|
|
|
|
|
@implementer(IGeventDidPatchModuleEvent)
|
|
class GeventDidPatchModuleEvent(GeventDidPatchEvent):
|
|
"""
|
|
Implementation of `IGeventDidPatchModuleEvent`.
|
|
"""
|
|
|
|
#: The name of the setuptools entry point that is called when this
|
|
#: event is emitted.
|
|
ENTRY_POINT_NAME = 'gevent.plugins.monkey.did_patch_module'
|
|
|
|
def __init__(self, module_name, source, target):
|
|
super(GeventDidPatchModuleEvent, self).__init__(source, target)
|
|
self.module_name = module_name
|
|
|
|
# TODO: Maybe it would be useful for the the module patch events
|
|
# to have an attribute telling if they're being done during patch_all?
|
|
|
|
class IGeventWillPatchAllEvent(IGeventWillPatchEvent):
|
|
"""
|
|
An event emitted *before* gevent begins patching the system.
|
|
|
|
Following this event will be a series of
|
|
`IGeventWillPatchModuleEvent` and `IGeventDidPatchModuleEvent` for
|
|
each patched module.
|
|
|
|
Once the gevent builtin modules have been processed,
|
|
`IGeventDidPatchBuiltinModulesEvent` will be emitted. Processing
|
|
this event is an ideal time for third-party modules to be imported
|
|
and patched (which may trigger its own will/did patch module
|
|
events).
|
|
|
|
Finally, a `IGeventDidPatchAllEvent` will be sent.
|
|
|
|
If a subscriber to this event raises `DoNotPatch`, no patching
|
|
will be done.
|
|
|
|
The *source* and *target* attributes have undefined values.
|
|
"""
|
|
|
|
patch_all_arguments = Attribute(
|
|
"A dictionary of all the arguments to `gevent.monkey.patch_all`. "
|
|
"This dictionary should not be modified. "
|
|
)
|
|
|
|
patch_all_kwargs = Attribute(
|
|
"A dictionary of the extra arguments to `gevent.monkey.patch_all`. "
|
|
"This dictionary should not be modified. "
|
|
)
|
|
|
|
def will_patch_module(module_name):
|
|
"""
|
|
Return whether the module named *module_name* will be patched.
|
|
"""
|
|
|
|
class _PatchAllMixin(object):
|
|
def __init__(self, patch_all_arguments, patch_all_kwargs):
|
|
super(_PatchAllMixin, self).__init__(None, None)
|
|
self._patch_all_arguments = patch_all_arguments
|
|
self._patch_all_kwargs = patch_all_kwargs
|
|
|
|
@property
|
|
def patch_all_arguments(self):
|
|
return self._patch_all_arguments.copy()
|
|
|
|
@property
|
|
def patch_all_kwargs(self):
|
|
return self._patch_all_kwargs.copy()
|
|
|
|
def __repr__(self):
|
|
return '<%s %r at %x>' % (self.__class__.__name__,
|
|
self._patch_all_arguments,
|
|
id(self))
|
|
|
|
@implementer(IGeventWillPatchAllEvent)
|
|
class GeventWillPatchAllEvent(_PatchAllMixin, GeventWillPatchEvent):
|
|
"""
|
|
Implementation of `IGeventWillPatchAllEvent`.
|
|
"""
|
|
|
|
#: The name of the setuptools entry point that is called when this
|
|
#: event is emitted.
|
|
ENTRY_POINT_NAME = 'gevent.plugins.monkey.will_patch_all'
|
|
|
|
def will_patch_module(self, module_name):
|
|
return self.patch_all_arguments.get(module_name)
|
|
|
|
class IGeventDidPatchBuiltinModulesEvent(IGeventDidPatchEvent):
|
|
"""
|
|
Event emitted *after* the builtin modules have been patched.
|
|
|
|
The values of the *source* and *target* attributes are undefined.
|
|
"""
|
|
|
|
patch_all_arguments = Attribute(
|
|
"A dictionary of all the arguments to `gevent.monkey.patch_all`. "
|
|
"This dictionary should not be modified. "
|
|
)
|
|
|
|
patch_all_kwargs = Attribute(
|
|
"A dictionary of the extra arguments to `gevent.monkey.patch_all`. "
|
|
"This dictionary should not be modified. "
|
|
)
|
|
|
|
@implementer(IGeventDidPatchBuiltinModulesEvent)
|
|
class GeventDidPatchBuiltinModulesEvent(_PatchAllMixin, GeventDidPatchEvent):
|
|
"""
|
|
Implementation of `IGeventDidPatchBuiltinModulesEvent`.
|
|
"""
|
|
|
|
#: The name of the setuptools entry point that is called when this
|
|
#: event is emitted.
|
|
ENTRY_POINT_NAME = 'gevent.plugins.monkey.did_patch_builtins'
|
|
|
|
class IGeventDidPatchAllEvent(IGeventDidPatchEvent):
|
|
"""
|
|
Event emitted after gevent has patched all modules, both builtin
|
|
and those provided by plugins/subscribers.
|
|
|
|
The values of the *source* and *target* attributes are undefined.
|
|
"""
|
|
|
|
@implementer(IGeventDidPatchAllEvent)
|
|
class GeventDidPatchAllEvent(_PatchAllMixin, GeventDidPatchEvent):
|
|
"""
|
|
Implementation of `IGeventDidPatchAllEvent`.
|
|
"""
|
|
|
|
#: The name of the setuptools entry point that is called when this
|
|
#: event is emitted.
|
|
ENTRY_POINT_NAME = 'gevent.plugins.monkey.did_patch_all'
|