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