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236 lines
8.4 KiB
Python
236 lines
8.4 KiB
Python
5 years ago
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# Copyright 2018 gevent. See LICENSE for details.
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# Portions of the following are inspired by code from eventlet. I
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# believe they are distinct enough that no eventlet copyright would
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# apply (they are not a copy or substantial portion of the eventlot
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# code).
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# Added in gevent 1.3a2. Not public in that release.
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from __future__ import absolute_import, print_function
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import importlib
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import sys
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from gevent._compat import PY3
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from gevent._compat import iteritems
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from gevent._compat import imp_acquire_lock
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from gevent._compat import imp_release_lock
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from gevent.builtins import __import__ as g_import
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MAPPING = {
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'gevent.local': '_threading_local',
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'gevent.socket': 'socket',
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'gevent.select': 'select',
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'gevent.ssl': 'ssl',
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'gevent.thread': '_thread' if PY3 else 'thread',
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'gevent.subprocess': 'subprocess',
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'gevent.os': 'os',
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'gevent.threading': 'threading',
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'gevent.builtins': 'builtins' if PY3 else '__builtin__',
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'gevent.signal': 'signal',
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'gevent.time': 'time',
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'gevent.queue': 'queue' if PY3 else 'Queue',
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'gevent.contextvars': 'contextvars',
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}
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_PATCH_PREFIX = '__g_patched_module_'
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class _SysModulesPatcher(object):
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def __init__(self, importing, extra_all=lambda mod_name: ()):
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# Permanent state.
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self.extra_all = extra_all
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self.importing = importing
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# green modules, replacing regularly imported modules.
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# This begins as the gevent list of modules, and
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# then gets extended with green things from the tree we import.
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self._green_modules = {
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stdlib_name: importlib.import_module(gevent_name)
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for gevent_name, stdlib_name
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in iteritems(MAPPING)
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}
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## Transient, reset each time we're called.
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# The set of things imported before we began.
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self._t_modules_to_restore = {}
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def _save(self):
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self._t_modules_to_restore = {}
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# Copy all the things we know we are going to overwrite.
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for modname in self._green_modules:
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self._t_modules_to_restore[modname] = sys.modules.get(modname, None)
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# Copy anything else in the import tree.
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for modname, mod in list(iteritems(sys.modules)):
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if modname.startswith(self.importing):
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self._t_modules_to_restore[modname] = mod
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# And remove it. If it had been imported green, it will
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# be put right back. Otherwise, it was imported "manually"
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# outside this process and isn't green.
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del sys.modules[modname]
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# Cover the target modules so that when you import the module it
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# sees only the patched versions
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for name, mod in iteritems(self._green_modules):
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sys.modules[name] = mod
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def _restore(self):
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# Anything from the same package tree we imported this time
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# needs to be saved so we can restore it later, and so it doesn't
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# leak into the namespace.
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for modname, mod in list(iteritems(sys.modules)):
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if modname.startswith(self.importing):
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self._green_modules[modname] = mod
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del sys.modules[modname]
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# Now, what we saved at the beginning needs to be restored.
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for modname, mod in iteritems(self._t_modules_to_restore):
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if mod is not None:
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sys.modules[modname] = mod
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else:
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try:
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del sys.modules[modname]
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except KeyError:
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pass
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def __exit__(self, t, v, tb):
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try:
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self._restore()
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finally:
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imp_release_lock()
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self._t_modules_to_restore = None
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def __enter__(self):
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imp_acquire_lock()
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self._save()
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return self
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module = None
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def __call__(self, after_import_hook):
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if self.module is None:
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with self:
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self.module = self.import_one(self.importing, after_import_hook)
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# Circular reference. Someone must keep a reference to this module alive
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# for it to be visible. We record it in sys.modules to be that someone, and
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# to aid debugging. In the past, we worked with multiple completely separate
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# invocations of `import_patched`, but we no longer do.
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self.module.__gevent_patcher__ = self
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sys.modules[_PATCH_PREFIX + self.importing] = self.module
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return self
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def import_one(self, module_name, after_import_hook):
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patched_name = _PATCH_PREFIX + module_name
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if patched_name in sys.modules:
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return sys.modules[patched_name]
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assert module_name.startswith(self.importing)
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sys.modules.pop(module_name, None)
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module = g_import(module_name, {}, {}, module_name.split('.')[:-1])
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self.module = module
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# On Python 3, we could probably do something much nicer with the
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# import machinery? Set the __loader__ or __finder__ or something like that?
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self._import_all([module])
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after_import_hook(module)
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return module
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def _import_all(self, queue):
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# Called while monitoring for patch changes.
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while queue:
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module = queue.pop(0)
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name = module.__name__
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mod_all = tuple(getattr(module, '__all__', ())) + self.extra_all(name)
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for attr_name in mod_all:
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try:
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getattr(module, attr_name)
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except AttributeError:
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module_name = module.__name__ + '.' + attr_name
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new_module = g_import(module_name, {}, {}, attr_name)
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setattr(module, attr_name, new_module)
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queue.append(new_module)
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def import_patched(module_name,
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extra_all=lambda mod_name: (),
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after_import_hook=lambda module: None):
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"""
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Import *module_name* with gevent monkey-patches active,
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and return an object holding the greened module as *module*.
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Any sub-modules that were imported by the package are also
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saved.
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.. versionchanged:: 1.5a4
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If the module defines ``__all__``, then each of those
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attributes/modules is also imported as part of the same transaction,
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recursively. The order of ``__all__`` is respected. Anything passed in
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*extra_all* (which must be in the same namespace tree) is also imported.
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.. versionchanged:: 1.5a4
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You must now do all patching for a given module tree
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with one call to this method, or at least by using the returned
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object.
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"""
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with cached_platform_architecture():
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# Save the current module state, and restore on exit,
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# capturing desirable changes in the modules package.
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patcher = _SysModulesPatcher(module_name, extra_all)
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patcher(after_import_hook)
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return patcher
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class cached_platform_architecture(object):
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"""
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Context manager that caches ``platform.architecture``.
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Some things that load shared libraries (like Cryptodome, via
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dnspython) invoke ``platform.architecture()`` for each one. That
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in turn wants to fork and run commands , which in turn wants to
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call ``threading._after_fork`` if the GIL has been initialized.
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All of that means that certain imports done early may wind up
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wanting to have the hub initialized potentially much earlier than
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before.
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Part of the fix is to observe when that happens and delay
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initializing parts of gevent until as late as possible (e.g., we
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delay importing and creating the resolver until the hub needs it,
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unless explicitly configured).
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The rest of the fix is to avoid the ``_after_fork`` issues by
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first caching the results of platform.architecture before doing
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patched imports.
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(See events.py for similar issues with platform, and
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test__threading_2.py for notes about threading._after_fork if the
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GIL has been initialized)
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"""
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_arch_result = None
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_orig_arch = None
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_platform = None
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def __enter__(self):
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import platform
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self._platform = platform
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self._arch_result = platform.architecture()
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self._orig_arch = platform.architecture
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def arch(*args, **kwargs):
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if not args and not kwargs:
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return self._arch_result
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return self._orig_arch(*args, **kwargs)
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platform.architecture = arch
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return self
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def __exit__(self, *_args):
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self._platform.architecture = self._orig_arch
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self._platform = None
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