Mercurial > hg
view hgdemandimport/tracing.py @ 41879:e5ece0f46b40
discovery: moved sampling functions inside discovery object
In this patch, we transform the sampling functions into
methods of the `partialdiscovery` class in the Python case.
This will provide multiple benefit. For example we can keep some cache from one
sampling to another. In addition this will help the Oxidation work as all graph
traversal related logic will be contained in a single object.
author | Georges Racinet <georges.racinet@octobus.net> |
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date | Wed, 27 Feb 2019 23:55:19 +0100 |
parents | 452790284a15 |
children | d0b8a3cfd732 |
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# Support code for event tracing in Mercurial. Lives in demandimport # so it can also be used in demandimport. # # Copyright 2018 Google LLC. # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import absolute_import import contextlib import os _pipe = None _checked = False @contextlib.contextmanager def log(whencefmt, *whenceargs): global _pipe, _session, _checked if _pipe is None: if _checked: yield return _checked = True if 'HGCATAPULTSERVERPIPE' not in os.environ: yield return _pipe = open(os.environ['HGCATAPULTSERVERPIPE'], 'w', 1) _session = os.environ.get('HGCATAPULTSESSION', 'none') whence = whencefmt % whenceargs try: # Both writes to the pipe are wrapped in try/except to ignore # errors, as we can see mysterious errors in here if the pager # is active. Presumably other conditions could trigger # problems too. try: _pipe.write('START %s %s\n' % (_session, whence)) except IOError: pass yield finally: try: _pipe.write('END %s %s\n' % (_session, whence)) except IOError: pass