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106 lines
3.5 KiB
Python
106 lines
3.5 KiB
Python
# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
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# For details: https://bitbucket.org/ned/coveragepy/src/default/NOTICE.txt
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"""Monkey-patching to add multiprocessing support for coverage.py"""
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import multiprocessing
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import multiprocessing.process
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import os
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import sys
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from coverage.misc import contract
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# An attribute that will be set on the module to indicate that it has been
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# monkey-patched.
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PATCHED_MARKER = "_coverage$patched"
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# The environment variable that specifies the rcfile for subprocesses.
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COVERAGE_RCFILE_ENV = "_COVERAGE_RCFILE"
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if sys.version_info >= (3, 4):
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OriginalProcess = multiprocessing.process.BaseProcess
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else:
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OriginalProcess = multiprocessing.Process
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original_bootstrap = OriginalProcess._bootstrap
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class ProcessWithCoverage(OriginalProcess):
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"""A replacement for multiprocess.Process that starts coverage."""
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def _bootstrap(self):
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"""Wrapper around _bootstrap to start coverage."""
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from coverage import Coverage # avoid circular import
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rcfile = os.environ[COVERAGE_RCFILE_ENV]
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cov = Coverage(data_suffix=True, config_file=rcfile)
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cov.start()
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debug = cov.debug
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try:
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if debug.should("multiproc"):
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debug.write("Calling multiprocessing bootstrap")
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return original_bootstrap(self)
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finally:
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if debug.should("multiproc"):
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debug.write("Finished multiprocessing bootstrap")
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cov.stop()
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cov.save()
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if debug.should("multiproc"):
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debug.write("Saved multiprocessing data")
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class Stowaway(object):
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"""An object to pickle, so when it is unpickled, it can apply the monkey-patch."""
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def __init__(self, rcfile):
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self.rcfile = rcfile
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def __getstate__(self):
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return {'rcfile': self.rcfile}
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def __setstate__(self, state):
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patch_multiprocessing(state['rcfile'])
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@contract(rcfile=str)
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def patch_multiprocessing(rcfile):
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"""Monkey-patch the multiprocessing module.
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This enables coverage measurement of processes started by multiprocessing.
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This involves aggressive monkey-patching.
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`rcfile` is the path to the rcfile being used.
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"""
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if hasattr(multiprocessing, PATCHED_MARKER):
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return
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if sys.version_info >= (3, 4):
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OriginalProcess._bootstrap = ProcessWithCoverage._bootstrap
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else:
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multiprocessing.Process = ProcessWithCoverage
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# Set the value in ProcessWithCoverage that will be pickled into the child
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# process.
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os.environ[COVERAGE_RCFILE_ENV] = rcfile
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# When spawning processes rather than forking them, we have no state in the
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# new process. We sneak in there with a Stowaway: we stuff one of our own
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# objects into the data that gets pickled and sent to the sub-process. When
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# the Stowaway is unpickled, it's __setstate__ method is called, which
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# re-applies the monkey-patch.
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# Windows only spawns, so this is needed to keep Windows working.
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try:
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from multiprocessing import spawn
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original_get_preparation_data = spawn.get_preparation_data
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except (ImportError, AttributeError):
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pass
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else:
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def get_preparation_data_with_stowaway(name):
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"""Get the original preparation data, and also insert our stowaway."""
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d = original_get_preparation_data(name)
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d['stowaway'] = Stowaway(rcfile)
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return d
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spawn.get_preparation_data = get_preparation_data_with_stowaway
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setattr(multiprocessing, PATCHED_MARKER, True)
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