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@@ -1,44 +1,48 b'' | |||
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1 | 1 | # Support code for event tracing in Mercurial. Lives in demandimport |
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2 | 2 | # so it can also be used in demandimport. |
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3 | 3 | # |
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4 | 4 | # Copyright 2018 Google LLC. |
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5 | 5 | # |
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6 | 6 | # This software may be used and distributed according to the terms of the |
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7 | 7 | # GNU General Public License version 2 or any later version. |
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8 | 8 | from __future__ import absolute_import |
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9 | 9 | |
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10 | 10 | import contextlib |
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11 | 11 | import os |
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12 | 12 | |
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13 | 13 | _pipe = None |
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14 | 14 | _checked = False |
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15 | 15 | |
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16 | @contextlib.contextmanager | |
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17 | def log(whencefmt, *whenceargs): | |
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16 | def _isactive(): | |
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18 | 17 | global _pipe, _session, _checked |
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19 | 18 | if _pipe is None: |
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20 | 19 | if _checked: |
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21 |
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22 | return | |
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20 | return False | |
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23 | 21 | _checked = True |
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24 | 22 | if 'HGCATAPULTSERVERPIPE' not in os.environ: |
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25 |
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26 | return | |
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23 | return False | |
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27 | 24 | _pipe = open(os.environ['HGCATAPULTSERVERPIPE'], 'w', 1) |
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28 | 25 | _session = os.environ.get('HGCATAPULTSESSION', 'none') |
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26 | return True | |
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27 | ||
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28 | @contextlib.contextmanager | |
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29 | def log(whencefmt, *whenceargs): | |
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30 | if not _isactive(): | |
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31 | yield | |
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32 | return | |
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29 | 33 | whence = whencefmt % whenceargs |
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30 | 34 | try: |
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31 | 35 | # Both writes to the pipe are wrapped in try/except to ignore |
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32 | 36 | # errors, as we can see mysterious errors in here if the pager |
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33 | 37 | # is active. Presumably other conditions could trigger |
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34 | 38 | # problems too. |
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35 | 39 | try: |
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36 | 40 | _pipe.write('START %s %s\n' % (_session, whence)) |
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37 | 41 | except IOError: |
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38 | 42 | pass |
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39 | 43 | yield |
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40 | 44 | finally: |
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41 | 45 | try: |
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42 | 46 | _pipe.write('END %s %s\n' % (_session, whence)) |
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43 | 47 | except IOError: |
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44 | 48 | pass |
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