Mercurial > hg
annotate hgweb.cgi @ 25561:50a6c3c55db1 stable
parsers: do not cache RevlogError type (issue4451)
Index lookups raise RevlogError when the lookup fails. The previous
implementation was caching a reference to the RevlogError type in a
static variable. This assumed that the "mercurial.error" module was
only loaded once and there was only a single copy of it floating
around in memory. Unfortunately, in some situations - including
certain mod_wsgi configurations - this was not the case: the
"mercurial.error" module could be reloaded. It was possible for a
"RevlogError" reference from the first interpreter to be used by
a second interpreter. While the underlying thing was a
"mercurial.error.RevlogError," the object IDs were different, so
the Python code in revlog.py was failing to catch the exception! This
error has existed since the C index lookup code was implemented in
changeset e8d37b78acfb, which was first released in Mercurial 2.2 in
2012.
http://emptysqua.re/blog/python-c-extensions-and-mod-wsgi/#static-variables-are-shared
contains more details.
This patch removes the caching of the RevlogError type from the
function.
Since pretty much the entire function was refactored and the return
value of the function wasn't used, I changed the function signature
to not return anything.
For reasons unknown to me, we were calling PyErr_SetObject()
with the type of RevlogError and an instance of RevlogError. This
was equivalent to the Python code "raise RevlogError(RevlogError)".
This seemed wonky and completely unnecessary. The Python code only
cares about the type of the exception, not its contents. So I got
rid of this complexity.
This is my first Python C extension patch. Please give extra scrutiny
to it during review.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Fri, 12 Jun 2015 14:43:59 -0700 |
parents | 85cba926cb59 |
children | 4b0fc75f9403 |
rev | line source |
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202 | 1 #!/usr/bin/env python |
159 | 2 # |
11000
338167735124
hgweb: simplify hgweb.cgi, add help pointer
Matt Mackall <mpm@selenic.com>
parents:
6142
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changeset
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3 # An example hgweb CGI script, edit as necessary |
11503
227b9f13db13
hgweb: add link to wiki
Martin Geisler <mg@lazybytes.net>
parents:
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4 # See also http://mercurial.selenic.com/wiki/PublishingRepositories |
159 | 5 |
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Matt Mackall <mpm@selenic.com>
parents:
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6 # Path to repo or hgweb config to serve (see 'hg help hgweb') |
338167735124
hgweb: simplify hgweb.cgi, add help pointer
Matt Mackall <mpm@selenic.com>
parents:
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diff
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7 config = "/path/to/repo/or/config" |
5244
79279b5583c6
cgi: sys.path.insert should be before importing mercurial
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
5197
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changeset
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8 |
15475
85cba926cb59
hgweb: add hint about finding library path with debuginstall
Matt Mackall <mpm@selenic.com>
parents:
11503
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9 # Uncomment and adjust if Mercurial is not installed system-wide |
85cba926cb59
hgweb: add hint about finding library path with debuginstall
Matt Mackall <mpm@selenic.com>
parents:
11503
diff
changeset
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10 # (consult "installed modules" path from 'hg debuginstall'): |
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hgweb: simplify hgweb.cgi, add help pointer
Matt Mackall <mpm@selenic.com>
parents:
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diff
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11 #import sys; sys.path.insert(0, "/path/to/python/lib") |
5197
55860a45bbf2
Enable demandimport only in scripts, not in importable modules (issue605)
Thomas Arendsen Hein <thomas@intevation.de>
parents:
3868
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changeset
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12 |
6080
4baad19c4801
hgweb: disable cgitb by default
Maxim Dounin <mdounin@mdounin.ru>
parents:
5995
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13 # Uncomment to send python tracebacks to the browser if an error occurs: |
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hgweb: simplify hgweb.cgi, add help pointer
Matt Mackall <mpm@selenic.com>
parents:
6142
diff
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14 #import cgitb; cgitb.enable() |
391
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hgweb: pull cgitb into CGI script example, where it can easily be disabled
mpm@selenic.com
parents:
202
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15 |
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hgweb: simplify hgweb.cgi, add help pointer
Matt Mackall <mpm@selenic.com>
parents:
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16 from mercurial import demandimport; demandimport.enable() |
338167735124
hgweb: simplify hgweb.cgi, add help pointer
Matt Mackall <mpm@selenic.com>
parents:
6142
diff
changeset
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17 from mercurial.hgweb import hgweb, wsgicgi |
338167735124
hgweb: simplify hgweb.cgi, add help pointer
Matt Mackall <mpm@selenic.com>
parents:
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18 application = hgweb(config) |
6141
90e5c82a3859
Backed out changeset b913d3aacddc (see issue971/msg5317)
Thomas Arendsen Hein <thomas@intevation.de>
parents:
5995
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changeset
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19 wsgicgi.launch(application) |