287 lines
11 KiB
Python
287 lines
11 KiB
Python
import builtins
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import locale
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import logging
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import os
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import shutil
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import sys
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import sysconfig
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import warnings
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from test import support
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try:
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import threading
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except ImportError:
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threading = None
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try:
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import _multiprocessing, multiprocessing.process
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except ImportError:
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multiprocessing = None
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# Unit tests are supposed to leave the execution environment unchanged
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# once they complete. But sometimes tests have bugs, especially when
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# tests fail, and the changes to environment go on to mess up other
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# tests. This can cause issues with buildbot stability, since tests
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# are run in random order and so problems may appear to come and go.
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# There are a few things we can save and restore to mitigate this, and
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# the following context manager handles this task.
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class saved_test_environment:
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"""Save bits of the test environment and restore them at block exit.
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with saved_test_environment(testname, verbose, quiet):
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#stuff
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Unless quiet is True, a warning is printed to stderr if any of
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the saved items was changed by the test. The attribute 'changed'
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is initially False, but is set to True if a change is detected.
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If verbose is more than 1, the before and after state of changed
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items is also printed.
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"""
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changed = False
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def __init__(self, testname, verbose=0, quiet=False, *, pgo=False):
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self.testname = testname
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self.verbose = verbose
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self.quiet = quiet
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self.pgo = pgo
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# To add things to save and restore, add a name XXX to the resources list
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# and add corresponding get_XXX/restore_XXX functions. get_XXX should
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# return the value to be saved and compared against a second call to the
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# get function when test execution completes. restore_XXX should accept
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# the saved value and restore the resource using it. It will be called if
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# and only if a change in the value is detected.
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#
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# Note: XXX will have any '.' replaced with '_' characters when determining
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# the corresponding method names.
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resources = ('sys.argv', 'cwd', 'sys.stdin', 'sys.stdout', 'sys.stderr',
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'os.environ', 'sys.path', 'sys.path_hooks', '__import__',
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'warnings.filters', 'asyncore.socket_map',
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'logging._handlers', 'logging._handlerList', 'sys.gettrace',
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'sys.warnoptions',
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# multiprocessing.process._cleanup() may release ref
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# to a thread, so check processes first.
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'multiprocessing.process._dangling', 'threading._dangling',
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'sysconfig._CONFIG_VARS', 'sysconfig._INSTALL_SCHEMES',
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'files', 'locale', 'warnings.showwarning',
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'shutil_archive_formats', 'shutil_unpack_formats',
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)
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def get_sys_argv(self):
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return id(sys.argv), sys.argv, sys.argv[:]
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def restore_sys_argv(self, saved_argv):
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sys.argv = saved_argv[1]
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sys.argv[:] = saved_argv[2]
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def get_cwd(self):
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return os.getcwd()
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def restore_cwd(self, saved_cwd):
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os.chdir(saved_cwd)
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def get_sys_stdout(self):
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return sys.stdout
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def restore_sys_stdout(self, saved_stdout):
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sys.stdout = saved_stdout
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def get_sys_stderr(self):
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return sys.stderr
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def restore_sys_stderr(self, saved_stderr):
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sys.stderr = saved_stderr
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def get_sys_stdin(self):
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return sys.stdin
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def restore_sys_stdin(self, saved_stdin):
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sys.stdin = saved_stdin
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def get_os_environ(self):
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return id(os.environ), os.environ, dict(os.environ)
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def restore_os_environ(self, saved_environ):
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os.environ = saved_environ[1]
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os.environ.clear()
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os.environ.update(saved_environ[2])
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def get_sys_path(self):
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return id(sys.path), sys.path, sys.path[:]
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def restore_sys_path(self, saved_path):
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sys.path = saved_path[1]
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sys.path[:] = saved_path[2]
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def get_sys_path_hooks(self):
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return id(sys.path_hooks), sys.path_hooks, sys.path_hooks[:]
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def restore_sys_path_hooks(self, saved_hooks):
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sys.path_hooks = saved_hooks[1]
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sys.path_hooks[:] = saved_hooks[2]
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def get_sys_gettrace(self):
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return sys.gettrace()
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def restore_sys_gettrace(self, trace_fxn):
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sys.settrace(trace_fxn)
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def get___import__(self):
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return builtins.__import__
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def restore___import__(self, import_):
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builtins.__import__ = import_
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def get_warnings_filters(self):
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return id(warnings.filters), warnings.filters, warnings.filters[:]
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def restore_warnings_filters(self, saved_filters):
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warnings.filters = saved_filters[1]
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warnings.filters[:] = saved_filters[2]
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def get_asyncore_socket_map(self):
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asyncore = sys.modules.get('asyncore')
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# XXX Making a copy keeps objects alive until __exit__ gets called.
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return asyncore and asyncore.socket_map.copy() or {}
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def restore_asyncore_socket_map(self, saved_map):
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asyncore = sys.modules.get('asyncore')
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if asyncore is not None:
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asyncore.close_all(ignore_all=True)
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asyncore.socket_map.update(saved_map)
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def get_shutil_archive_formats(self):
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# we could call get_archives_formats() but that only returns the
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# registry keys; we want to check the values too (the functions that
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# are registered)
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return shutil._ARCHIVE_FORMATS, shutil._ARCHIVE_FORMATS.copy()
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def restore_shutil_archive_formats(self, saved):
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shutil._ARCHIVE_FORMATS = saved[0]
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shutil._ARCHIVE_FORMATS.clear()
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shutil._ARCHIVE_FORMATS.update(saved[1])
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def get_shutil_unpack_formats(self):
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return shutil._UNPACK_FORMATS, shutil._UNPACK_FORMATS.copy()
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def restore_shutil_unpack_formats(self, saved):
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shutil._UNPACK_FORMATS = saved[0]
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shutil._UNPACK_FORMATS.clear()
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shutil._UNPACK_FORMATS.update(saved[1])
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def get_logging__handlers(self):
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# _handlers is a WeakValueDictionary
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return id(logging._handlers), logging._handlers, logging._handlers.copy()
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def restore_logging__handlers(self, saved_handlers):
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# Can't easily revert the logging state
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pass
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def get_logging__handlerList(self):
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# _handlerList is a list of weakrefs to handlers
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return id(logging._handlerList), logging._handlerList, logging._handlerList[:]
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def restore_logging__handlerList(self, saved_handlerList):
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# Can't easily revert the logging state
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pass
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def get_sys_warnoptions(self):
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return id(sys.warnoptions), sys.warnoptions, sys.warnoptions[:]
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def restore_sys_warnoptions(self, saved_options):
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sys.warnoptions = saved_options[1]
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sys.warnoptions[:] = saved_options[2]
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# Controlling dangling references to Thread objects can make it easier
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# to track reference leaks.
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def get_threading__dangling(self):
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if not threading:
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return None
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# This copies the weakrefs without making any strong reference
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return threading._dangling.copy()
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def restore_threading__dangling(self, saved):
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if not threading:
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return
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threading._dangling.clear()
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threading._dangling.update(saved)
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# Same for Process objects
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def get_multiprocessing_process__dangling(self):
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if not multiprocessing:
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return None
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# Unjoined process objects can survive after process exits
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multiprocessing.process._cleanup()
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# This copies the weakrefs without making any strong reference
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return multiprocessing.process._dangling.copy()
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def restore_multiprocessing_process__dangling(self, saved):
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if not multiprocessing:
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return
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multiprocessing.process._dangling.clear()
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multiprocessing.process._dangling.update(saved)
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def get_sysconfig__CONFIG_VARS(self):
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# make sure the dict is initialized
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sysconfig.get_config_var('prefix')
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return (id(sysconfig._CONFIG_VARS), sysconfig._CONFIG_VARS,
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dict(sysconfig._CONFIG_VARS))
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def restore_sysconfig__CONFIG_VARS(self, saved):
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sysconfig._CONFIG_VARS = saved[1]
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sysconfig._CONFIG_VARS.clear()
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sysconfig._CONFIG_VARS.update(saved[2])
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def get_sysconfig__INSTALL_SCHEMES(self):
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return (id(sysconfig._INSTALL_SCHEMES), sysconfig._INSTALL_SCHEMES,
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sysconfig._INSTALL_SCHEMES.copy())
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def restore_sysconfig__INSTALL_SCHEMES(self, saved):
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sysconfig._INSTALL_SCHEMES = saved[1]
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sysconfig._INSTALL_SCHEMES.clear()
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sysconfig._INSTALL_SCHEMES.update(saved[2])
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def get_files(self):
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return sorted(fn + ('/' if os.path.isdir(fn) else '')
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for fn in os.listdir())
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def restore_files(self, saved_value):
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fn = support.TESTFN
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if fn not in saved_value and (fn + '/') not in saved_value:
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if os.path.isfile(fn):
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support.unlink(fn)
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elif os.path.isdir(fn):
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support.rmtree(fn)
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_lc = [getattr(locale, lc) for lc in dir(locale)
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if lc.startswith('LC_')]
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def get_locale(self):
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pairings = []
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for lc in self._lc:
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try:
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pairings.append((lc, locale.setlocale(lc, None)))
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except (TypeError, ValueError):
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continue
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return pairings
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def restore_locale(self, saved):
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for lc, setting in saved:
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locale.setlocale(lc, setting)
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def get_warnings_showwarning(self):
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return warnings.showwarning
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def restore_warnings_showwarning(self, fxn):
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warnings.showwarning = fxn
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def resource_info(self):
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for name in self.resources:
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method_suffix = name.replace('.', '_')
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get_name = 'get_' + method_suffix
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restore_name = 'restore_' + method_suffix
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yield name, getattr(self, get_name), getattr(self, restore_name)
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def __enter__(self):
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self.saved_values = dict((name, get()) for name, get, restore
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in self.resource_info())
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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saved_values = self.saved_values
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del self.saved_values
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for name, get, restore in self.resource_info():
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current = get()
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original = saved_values.pop(name)
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# Check for changes to the resource's value
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if current != original:
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self.changed = True
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restore(original)
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if not self.quiet and not self.pgo:
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print("Warning -- {} was modified by {}".format(
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name, self.testname),
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file=sys.stderr)
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if self.verbose > 1:
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print(" Before: {}\n After: {} ".format(
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original, current),
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file=sys.stderr)
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return False
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