hgweb.cgi

revset: use phasecache.getrevset

This is part of a refactoring that moves some phase query optimization from
revset.py to phases.py. See the previous patch for motivation.

This patch changes revset code to use phasecache.getrevset so it no longer
accesses the private field: _phasecache._phasesets directly.

For performance impact, this patch was tested using the following query, on
my hg-committed repo:

    for i in 'public()' 'not public()' 'draft()' 'not draft()'; do
        echo $i;
        hg perfrevset "$i";
        hg perfrevset "$i" --hidden;
    done

For the CPython implementation, most operations are unchanged (within
+/- 1%), while "not public()" and "draft()" is noticeably faster on an
unfiltered repo. It may be because the new code avoids a set copy if
filteredrevs is empty.

  revset  | public()      | not public() | draft()    | not draft()
  hidden  |  yes  |  no   |   yes |  no  | yes |  no  | yes  |  no
  ------------------------------------------------------------------
  before  | 19006 | 17352 |   239 |  286 | 180 |  228 | 7690 | 5745
  after   | 19137 | 17231 |   240 |  207 | 182 |  150 | 7687 | 5658
  delta   |                       | -38% |     | -52% |

  (timed in microseconds)

For the pure Python implementation, some operations are faster while "not
draft()" is noticeably slower:

  revset  | public()      | not public()  | draft()       | not draft()
  hidden  |  yes  |  no   |   yes |  no   | yes   |  no   | yes   |  no
  ------------------------------------------------------------------------
  before  | 18852 | 17183 | 17758 | 15921 | 17505 | 15973 | 41521 | 39822
  after   | 18924 | 17380 | 17558 | 14545 | 16727 | 13593 | 48356 | 43992
  delta   |                       |   -9% |   -5% |  -15% |  +16% |  +10%

That may be the different performance characters of generatorset vs.
filteredset. The "not draft()" query could be optimized in this case where
both "public" and "secret" are passed to "getrevsets" so it won't iterate
the whole repo twice.

#!/usr/bin/env python
#
# An example hgweb CGI script, edit as necessary
# See also https://mercurial-scm.org/wiki/PublishingRepositories

# Path to repo or hgweb config to serve (see 'hg help hgweb')
config = "/path/to/repo/or/config"

# Uncomment and adjust if Mercurial is not installed system-wide
# (consult "installed modules" path from 'hg debuginstall'):
#import sys; sys.path.insert(0, "/path/to/python/lib")

# Uncomment to send python tracebacks to the browser if an error occurs:
#import cgitb; cgitb.enable()

from mercurial import demandimport; demandimport.enable()
from mercurial.hgweb import hgweb, wsgicgi
application = hgweb(config)
wsgicgi.launch(application)