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rFBHGX2c843b93364b: clindex: integrate Rust nodemap

Summary

Change clindex so it can use the rust nodemap for node lookups and partial
match. By default, the code runs in a "verify" mode that compares the rust
nodemap against the original nodemap. Once we gain more confident, we can
drop the support of the original nodemap (so it does not build a radix
tree).

After this, there is no need to enable perftweaks.cachenoderevs or
fastpartialmatch.

Performance wise, the nodemap seems to be a bit faster than revlog.c trie.
The former takes 91% (+/-5%) of the time needed for the latter. That was
tested by running the following script 20 times on fbsource:

from mercurial.cext import parsers
from hgext3rd.rust import indexes
import contextlib, os
m = {}
@contextlib.contextmanager
def measure(name):
    utime, stime, cutime, cstime, elapsed = os.times()
    try:
        yield
    finally:
        utime2, stime2, cutime, cstime, elapsed2 = os.times()
        print('%14s: User %.3f  Sys %.3f  Real %.3f'
              % (name, utime2 - utime, stime2 - stime, elapsed2 - elapsed))
        m[name] = elapsed2 - elapsed
cl = open('00changelog.i').read()
with measure('nodemap'):
    nm = indexes.nodemap(cl, indexes.nodemap.emptyindexbuffer())
    nm.partialmatch('da0443cd533f4073e8d0e324d55')
with measure('revlog index'):
    idx = parsers.index(cl, False)
    idx.partialmatch('da0443cd533f4073e8d0e324d55')
print('nodemap: %.2f revlog' % (m['nodemap'] / m['revlog index']))

Test Plan

Checks clindex with rust nodemap can be a drop-in replacement

Change revlog.py temporarily to disable its inline feature so clindex will be used:

-_maxinline = 131072
+_maxinline = 0

Then run tests with the extension enabled:

./run-tests.py -l --extra-config-opt=extensions.clindex= --extra-config-opt=clindex.lagthreshold=1 --extra-config-opt=clindex.logpath=/tmp/l  -j `nproc`

Check the test output change makes sense (ex. extension list change, .hg
content change, help text change) and /tmp/l does not have contents like
"inconsistent" or "corrupted".

Check memory safety

Rebuild Python to be valgrind friendly (--without-pymalloc --with-valgrind),

Disable re2 by changing import re2 in util.py to import not_exist since it
will trigger a lot of "read uninitialized memory" reports.

Use valgrind to run a few hg commands:

valgrind python2 hg commit -m 1 --config extensions.clindex= --config clindex.lagthreshold=1

Especially, do a rebase with obsstore disabled to exercise the "strip" code
path and make sure valgrind does not report anything except for memory leak
(normal for Python).

Diff Detail

Repository

rFBHGX Facebook Mercurial Extensions

Lint

Lint Skipped

Unit

Unit Tests Skipped

Event Timeline

quark created this revision.Nov 20 2017, 7:11 PM

Herald added a reviewer: Restricted Project. · View Herald TranscriptNov 20 2017, 7:11 PM

I will split the diff.

EDIT: does not look that easy to split.

quark planned changes to this revision.Nov 21 2017, 12:14 PM

quark added inline comments.

hgext3rd/clindex.pyx
416	This method got missing when rebasing.

quark updated this revision to Diff 3742.Nov 21 2017, 3:25 PM

quark mentioned this in D474: perftweaks: store rev to node mapping for preloading.Nov 21 2017, 10:21 PM

quark edited the test plan for this revision. (Show Details)Nov 22 2017, 8:45 PM

quark updated this revision to Diff 3791.

quark edited the test plan for this revision. (Show Details)Nov 22 2017, 8:52 PM

quark edited the summary of this revision. (Show Details)Nov 22 2017, 9:31 PM

quark added a child revision: D1517: radixbuf: make key reader function more flexible.Nov 27 2017, 1:30 PM

quark updated this revision to Diff 3878.

Small comments

hgext3rd/clindex.pyx
81	And we're relying on the mmap config to make this fast right?
86	I think this was covered in one of your other diffs, but what happens if the nodemap index is out of date? It builds an inmemory index of the new stuff at the end of the origindex file?
183	If config.nodemap is False, rustnodemap is undefined here right? Is that a problem?
328	Hmm, so this means any command that accesses to repositories changelogs in one process will write logs to the wrong place? And they'll probably read the wrong config as well? Since the clindex class has access to a vfs, which I assume is the svfs, could we have these global objects at least be in a dictionary indexed by svfs root path? So multiple repositories don't collide?
385	Should we set _logpath equal to False here or something? So we don't repeatedly try to open the bad logpath?

This revision now requires changes to proceed.Dec 6 2017, 7:48 PM

quark added inline comments.Dec 7 2017, 3:38 PM

hgext3rd/clindex.pyx
81	The mmap config removes cost reading `.i` happening at `revlog.__init__`, not here. Constructing `origindextype` is fast regardless of the mmap option.
86	It builds the "side index" as a separate index. It's not mutating the main index since there is no way to copy-on-write plus appending the main index buffer. It's possible to implement such copy-on-write in user-space. But that might introduce too much overhead.
183	It's a problem introduced by multiple amends. Will change.
328	clindex uses cachevfs. I think config and cachevfs will be right since when `_wrapchangelog` re-assign them, the re-assignment won't affect existing clindex objects. Log paths could be wrong if repo changed, yes. But blackbox and commandserver.logpath have similar issues. Maybe we should just use a single global path like `/var/log/mercurial/...`. I noticed infinitepush is already using that.

quark updated this revision to Diff 4372.Dec 11 2017, 7:20 PM

quark added inline comments.Dec 11 2017, 7:22 PM

hgext3rd/clindex.pyx
385	Should be fine? blackbox does not have that logic and there were no complaints yet.

durham accepted this revision.Dec 14 2017, 7:38 PM

This revision is now accepted and ready to land.Dec 14 2017, 7:38 PM

quark updated this revision to Diff 4454.Dec 14 2017, 9:21 PM

quark added a child revision: D1518: nodemap: move some methods to changelog utils.Dec 14 2017, 9:22 PM

quark edited the summary of this revision. (Show Details)Dec 14 2017, 10:15 PM

Closed by commit rFBHGX2c843b93364b: clindex: integrate Rust nodemap (authored by quark). · Explain WhyDec 15 2017, 2:35 PM

This revision was automatically updated to reflect the committed changes.

quark removed a child revision: D1518: nodemap: move some methods to changelog utils.Dec 15 2017, 7:48 PM

			Path	Packages
M			hgext3rd/clindex.pyx (379 lines)

Diff	ID	Description	Created	Lint	Unit
Base		Base
Diff 1	3703		Nov 20 2017, 7:11 PM	★	★
Diff 2	3742		Nov 21 2017, 3:25 PM	★	★
Diff 3	3791		Nov 22 2017, 8:45 PM	★	★
Diff 4	3878		Nov 27 2017, 1:30 PM	★	★
Diff 5	4372		Dec 11 2017, 7:20 PM	★	★
Diff 6	4454		Dec 14 2017, 9:21 PM	★	★
Diff 7	4513	rFBHGX2c843b93364b17567a0b64a2236ac9a578431679	Dec 15 2017, 2:29 PM	★	★

Status	Author	Revision
Abandoned	quark	D1517 radixbuf: make key reader function more flexible
Closed	quark	D1472 clindex: integrate Rust nodemap
Closed	quark	D1471 setup: make rust nodemap buildable
Closed	quark	D1470 nodemap: implement Python interface
Closed	quark	D1493 pybuf: add a simple abstraction around Py_buffer interface
Closed	quark	D1469 nodemap: implement nodemap in rust
Closed	quark	D1291 radixbuf: implement the main radix tree
Closed	quark	D1432 radixbuf: add read and write functions for keys
Closed	quark	D1290 radixbuf: add a base16 iterator
Closed	quark	D1289 radixbuf: initial boilerplate

Diff 3791

hgext3rd/clindex.pyx

	# Copyright 2017 Facebook, Inc.			# Copyright 2017 Facebook, Inc.
	#			#
	# This software may be used and distributed according to the terms of the			# This software may be used and distributed according to the terms of the
	# GNU General Public License version 2 or any later version.			# GNU General Public License version 2 or any later version.

	"""alternative changelog index			"""alternative changelog index

	This extension replaces certain parts of changelog index algorithms to make it			This extension replaces certain parts of changelog index algorithms to make it
	more efficient when changelog is large.			more efficient when changelog is large.

				Config::

				[clindex]
				# Use Rust nodemap
				nodemap = True

				# Verify operations against other implementations.
				# Turn this off for performance.
				verify = True

				# Incrementally build Rust nodemap once it misses 20k revisions
				lagthreshold = 20000

				# Path to write logs (default: $repo/.hg/cache/clindex.log)
				logpath = /tmp/a.log
	"""			"""

	from __future__ import absolute_import			from __future__ import absolute_import

				import datetime
				import errno
				import os

	from mercurial import (			from mercurial import (
	changelog,			changelog,
				chgserver,
	error,			error,
	extensions,			extensions,
				localrepo,
	policy,			policy,
				registrar,
	revlog,			revlog,
				util,
				vfs as vfsmod,
	)			)

	origindex = policy.importmod('parsers').index			from mercurial.node import (
				hex,
				nullhex,
				nullid,
				)

				from .rust import indexes

				configtable = {}
				configitem = registrar.configitem(configtable)

				configitem('clindex', 'nodemap', default=True)
				configitem('clindex', 'verify', default=True)

				# Inserting 20k nodes takes about 2ms. See https://phab.mercurial-scm.org/D1291
				# for the table of node count and performance.
				configitem('clindex', 'lagthreshold', default=20000)

				origindextype = policy.importmod('parsers').index

	# cdef is important for performance because it avoids dict lookups:			# cdef is important for performance because it avoids dict lookups:
	# - `self._origindex` becomes `some_c_struct_pointer->_origindex`			# - `self._origindex` becomes `some_c_struct_pointer->_origindex`
	# - `__getitem__`, `__len__` will be using `PyMappingMethods` APIs			# - `__getitem__`, `__len__` will be using `PyMappingMethods` APIs

	cdef class clindex(object):			cdef class clindex(object):
				cdef _changelog
				cdef localconfig _config
				cdef nodemap _nodemap
	cdef _origindex			cdef _origindex
				cdef _vfs

	def __init__(self, data, inlined):			def __init__(self, data, inlined, vfs, config):
	assert not inlined			assert not inlined
	self._origindex = origindex(data, inlined)			assert vfs
				self._origindex = origindextype(data, inlined)
				durhamUnsubmitted Not Done And we're relying on the mmap config to make this fast right? durham: And we're relying on the mmap config to make this fast right?
				quarkAuthorUnsubmitted Not Done The mmap config removes cost reading `.i` happening at `revlog.__init__`, not here. Constructing `origindextype` is fast regardless of the mmap option. quark: The mmap config removes cost reading `.i` happening at `revlog.__init__`, not here.
				self._changelog = data
				# Copy the config so it can be changed just for this clindex object.
				# For example, disabling Rust nodemap temporarily if strip happens.
				self._config = config.copy()
				self._nodemap = nodemap(self._origindex, data, vfs, config)
				durhamUnsubmitted Not Done I think this was covered in one of your other diffs, but what happens if the nodemap index is out of date? It builds an inmemory index of the new stuff at the end of the origindex file? durham: I think this was covered in one of your other diffs, but what happens if the nodemap index is…
				quarkAuthorUnsubmitted Not Done It builds the "side index" as a separate index. It's not mutating the main index since there is no way to copy-on-write plus appending the main index buffer. It's possible to implement such copy-on-write in user-space. But that might introduce too much overhead. quark: It builds the "side index" as a separate index. It's not mutating the main index since there is…
				self._vfs = vfs

	def ancestors(self, *revs):			def ancestors(self, *revs):
	return self._origindex.ancestors(*revs)			return self._origindex.ancestors(*revs)

	def commonancestorsheads(self, *revs):			def commonancestorsheads(self, *revs):
	return self._origindex.commonancestorsheads(*revs)			return self._origindex.commonancestorsheads(*revs)

	def __getitem__(self, int rev):			def __getitem__(self, int rev):

	def headrevsfiltered(self, filtered):			def headrevsfiltered(self, filtered):
	return self._origindex.headrevsfiltered(filtered)			return self._origindex.headrevsfiltered(filtered)

	def deltachain(self, rev, stoprev, generaldelta):			def deltachain(self, rev, stoprev, generaldelta):
	return self._origindex.deltachain(rev, stoprev, generaldelta)			return self._origindex.deltachain(rev, stoprev, generaldelta)

	def insert(self, int rev, entry):			def insert(self, int rev, entry):
	return self._origindex.insert(rev, entry)			if rev < 0:
				rev = len(self._origindex) + rev
				self._origindex.insert(rev, entry)
				self._nodemap[entry[-1]] = rev

	def partialmatch(self, hexnode):			def partialmatch(self, hexnode):
	return self._origindex.partialmatch(hexnode)			return self._nodemap.partialmatch(hexnode)

	def __len__(self):			def __len__(self):
	return len(self._origindex)			return len(self._origindex)

				def __delslice__(self, Py_ssize_t i, Py_ssize_t j):
				# This one is tricky: it's called by strip. The Rust nodemap cannot
				# really handle it easily so let's just disable it for now.
				# repo.destroyed() will reconstruct a clindex object, which will
				# re-enable and re-build the cache.
				del self._origindex[i:j]
				self._config.nodemap = False

	@property			@property
	def nodemap(self):			def nodemap(self):
	return nodemap(self._origindex)			return self._nodemap

				def destroying(self):
				_log('clindex: destroying')
				self._nodemap.destroying()

				def updatecaches(self):
				self._nodemap.updatecache()

	cdef class nodemap(object):			cdef class nodemap(object):
				"""mutable nodemap

				Backed by an immutable nodemap implemented by Rust and a simple override
				dict. The Rust nodemap only follows changelog index data while the nodemap
				has to support __setitem__ to be compatible with the current Mercurial
				APIs.
				"""
				cdef localconfig _config
	cdef _origindex			cdef _origindex
				cdef readonly _overrides # {node: rev \| None}
				cdef _rustnodemap
				cdef _vfs
				cdef bint _updated

				# empty index buffer has a minimal of 17 * 4 bytes
				emptyindex = b'\0' * 17 * 4

	def __init__(self, origindex):			def __init__(self, origindex, changelog, vfs, config):
				self._config = config
	self._origindex = origindex			self._origindex = origindex
				self._overrides = {}
				self._vfs = vfs
				try:
				index = util.buffer(util.mmapread(vfs('nodemap')))
				if len(index) < len(self.emptyindex):
				index = self.emptyindex
				except IOError as ex:
				if ex.errno != errno.ENOENT:
				raise
				_log('nodemap: is empty')
				index = self.emptyindex
				if config.nodemap:
				try:
				rustnodemap = indexes.nodemap(changelog, index)
				except Exception as ex:
				_log('nodemap: corrupted: %r' % ex)
				rustnodemap = indexes.nodemap(changelog, self.emptyindex)
				self._rustnodemap = rustnodemap
				durhamUnsubmitted Not Done If config.nodemap is False, rustnodemap is undefined here right? Is that a problem? durham: If config.nodemap is False, rustnodemap is undefined here right? Is that a problem?
				quarkAuthorUnsubmitted Not Done It's a problem introduced by multiple amends. Will change. quark: It's a problem introduced by multiple amends. Will change.
				self._updated = False

				def updatecache(self):
				# updatecache may get called for many times. That is, an "outdated"
				# changelog object being used across multiple transactions. This test
				# avoids unnecessary re-updates.
				if self._updated:
				return
				# nodemap was disabled (ex. by destroying()). The changelog is now
				# outdated. Do not rely on it building index.
				if not self._config.nodemap:
				return
				# Writing nodemap has a cost. Do not update it if not lagging too much.
				lag = self._rustnodemap.lag()
				if lag == 0 or lag < self._config.lagthreshold:
				return
				_log('nodemap: updating (lag=%s)' % lag)
				with self._vfs('nodemap', 'w', atomictemp=True) as f:
				f.write(self._rustnodemap.build())
				self._updated = True

	def __getitem__(self, node):			def __getitem__(self, node):
				if not self._config.nodemap:
	return self._origindex[node]			return self._origindex[node]

				if node == nullid:
				# special case for hg: '\0' * 20 => -1
				return -1
				if node in self._overrides:
				rev = self._overrides[node]
				elif self._config.verify:
				try:
				revorig = self._origindex[node]
				except error.RevlogError:
				revorig = None # convert "not found" to None
				rev = _logifraise(lambda: self._rustnodemap[node],
				lambda: {'nodemap.getitem': hex(node),
				'revorig': revorig})
				if rev != revorig:
				_logandraise('nodemap: inconsistent getitem(%s): %r vs %r'
				% (hex(node), rev, revorig))
				else:
				rev = self._rustnodemap[node]

				if rev is None:
				raise error.RevlogError
				else:
				return rev

	def __setitem__(self, node, rev):			def __setitem__(self, node, rev):
				self._overrides[node] = rev
	self._origindex[node] = rev			self._origindex[node] = rev

				def __delitem__(self, node):
				self._overrides[node] = None

	def __contains__(self, node):			def __contains__(self, node):
				if not self._config.nodemap:
	return node in self._origindex			return node in self._origindex

				if self._overrides.get(node) or node == nullid:
				return True

				if self._config.verify:
				resorig = node in self._origindex
				res = _logifraise(lambda: node in self._rustnodemap,
				lambda: {'nodemap.contains': hex(node),
				'resorig': resorig})
				if res != resorig:
				_logandraise('nodemap: inconsistent contains(%s): %r vs %r'
				% (hex(node), res, resorig))
				else:
				res = node in self._rustnodemap
				return res

	def get(self, node, default=None):			def get(self, node, default=None):
	return self._origindex.get(node, default)			if self.__contains__(node):
				return self.__getitem__(node)
				else:
				return default

				def partialmatch(self, hexprefix):
				if not self._config.nodemap:
				return self._origindex.partialmatch(hexprefix)

				if self._config.verify:
				resorig = self._origindex.partialmatch(hexprefix)
				res = _logifraise(
				lambda: self._rustpartialmatch(hexprefix),
				lambda: {'partialmatch': hexprefix, 'resorig': resorig})
				if res != resorig:
				_logandraise('nodemap: inconsistent partialmatch(%s): %r vs %r'
				% (hexprefix, res, resorig))
				else:
				res = self._rustpartialmatch(hexprefix)
				return res

				cdef _rustpartialmatch(self, hexprefix):
				candidates = set()
				# Special case: nullid
				if nullhex.startswith(hexprefix):
				candidates.add(nullid)
				try:
				node = self._rustnodemap.partialmatch(hexprefix)
				if node is not None:
				candidates.add(node)
				except RuntimeError as ex:
				# Convert 'ambiguous prefix' to RevlogError. This is because the
				# rust code cannot access RevlogError cleanly. So we do the
				# conversion here.
				if 'ambiguous prefix' in ex:
				raise error.RevlogError
				raise

				# Search nodes in overrides. This is needed because overrides could
				# live outside the changelog snapshot and are unknown to the rust
				# index. Ideally we can keep changelog always up-to-date with the
				# index. But that requires more changes (ex. removing index.insert API
				# and index takes care of data writes).
				candidates.update(k for k in self._overrides.iterkeys()
				if hex(k).startswith(hexprefix))
				if len(candidates) == 1:
				return list(candidates)[0]
				elif len(candidates) > 1:
				raise error.RevlogError
				else:
				return None

				@property
				def lag(self):
				if self._config.nodemap:
				return self._rustnodemap.lag()
				else:
				return 0

				def destroying(self):
				self._vfs.tryunlink('nodemap')
				self._config.nodemap = False

				# These are unfortunate. But we need vfs access inside index.__init__. Doing
				# that properly requires API changes in revlog.__init__ and
				# revlogio.parseindex that might make things uglier, or break the (potential)
				# intention of keeping revlog low-level, de-coupled from high-level objects
				# including vfs and ui. So let's use a temporary global state to pass the
				# vfs object and config options down to parseindex.
				durhamUnsubmitted Not Done Hmm, so this means any command that accesses to repositories changelogs in one process will write logs to the wrong place? And they'll probably read the wrong config as well? Since the clindex class has access to a vfs, which I assume is the svfs, could we have these global objects at least be in a dictionary indexed by svfs root path? So multiple repositories don't collide? durham: Hmm, so this means any command that accesses to repositories changelogs in one process will…
				quarkAuthorUnsubmitted Not Done clindex uses cachevfs. I think config and cachevfs will be right since when `_wrapchangelog` re-assign them, the re-assignment won't affect existing clindex objects. Log paths could be wrong if repo changed, yes. But blackbox and commandserver.logpath have similar issues. Maybe we should just use a single global path like `/var/log/mercurial/...`. I noticed infinitepush is already using that. quark: clindex uses cachevfs. I think config and cachevfs will be right since when `_wrapchangelog`…
				_cachevfs = None
				_logpath = None
				_config = None

				# Lightweight config state that is dedicated for this extensions and is
				# decoupled from heavy-weight ui object.
				cdef class localconfig:
				cdef public bint nodemap
				cdef public bint verify
				cdef public int lagthreshold

				def copy(self):
				rhs = localconfig()
				rhs.nodemap = self.nodemap
				rhs.verify = self.verify
				rhs.lagthreshold = self.lagthreshold
				return rhs

				@classmethod
				def fromui(cls, ui):
				self = cls()
				self.nodemap = ui.configbool('clindex', 'nodemap')
				self.verify = ui.configbool('clindex', 'verify')
				self.lagthreshold = ui.configint('clindex', 'lagthreshold')
				return self

	def _parseindex(orig, self, data, inline):			def _parseindex(orig, self, data, inline):
	if inline:			if inline:
	# clindex does not support inline			# clindex does not support inline. fallback to original index
	return orig(self, data, inline)			return orig(self, data, inline)
	index = clindex(data, inline)			index = clindex(data, inline, _cachevfs, _config)
	return index, index.nodemap, None			return index, index.nodemap, None

	def _changeloginit(orig, self, args, *kwargs):			# Simple utilities to log debug messages
	with extensions.wrappedfunction(revlog.revlogio, 'parseindex', _parseindex):			def _logandraise(message):
	orig(self, args, *kwargs)			_log(message)
				raise RuntimeError(message)

				def _logifraise(func, infofunc):
				try:
				return func()
				except RuntimeError as ex:
				_log('exception: %r %r' % (ex, infofunc()))
				raise

				def _log(message):
				if not _logpath:
				return
				try:
				with open(_logpath, 'ab') as f:
				timestamp = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S.%f')
				pid = os.getpid()
				f.write('%s [%d] %s\n' % (timestamp, pid, message))
				except IOError:
				# The log is not important. IOError like "Permission denied" should not
				# be fatal.
				pass
				durhamUnsubmitted Not Done Should we set _logpath equal to False here or something? So we don't repeatedly try to open the bad logpath? durham: Should we set _logpath equal to False here or something? So we don't repeatedly try to open…
				quarkAuthorUnsubmitted Not Done Should be fine? blackbox does not have that logic and there were no complaints yet. quark: Should be fine? blackbox does not have that logic and there were no complaints yet.

				def _wrapchangelog(orig, repo):
				# need to pass vfs to _parseindex so it can read the cache directory
				global _cachevfs
				_cachevfs = repo.cachevfs

				# write debug logs until we have more confident of the feature
				global _logpath
				_logpath = repo.ui.config('clindex', 'logpath',
				_cachevfs.join('clindex.log'))

				# pass a subset of config interesting to this extension
				global _config
				_config = localconfig.fromui(repo.ui)

				try:
				with extensions.wrappedfunction(revlog.revlogio,
				'parseindex', _parseindex):
				return orig(repo)
				finally:
				_cachevfs = None

				def reposetup(ui, repo):
				if not repo.local():
				return
				unfi = repo.unfiltered()

				class clindexrepo(unfi.__class__):
				def updatecaches(self, tr=None):
				try:
				self.changelog.index.updatecaches()
				quarkAuthorUnsubmitted Not Done This method got missing when rebasing. quark: This method got missing when rebasing.
				except AttributeError as ex: # pure, or clindex is not used
				return
				super(clindexrepo, self).updatecaches(tr)

				def destroying(self):
				# Tell clindex to prepare for the strip. clindex will unlink
				# nodemap and other caches.
				try:
				self.changelog.index.destroying()
				except AttributeError as ex:
				return
				super(clindexrepo, self).destroying()

				def destroyed(self):
				# Force a reload of changelog. The current "self.changelog" object
				# has an outdated snapshot of changelog.i. We need to read the new
				# version before updatecaches().
				if 'changelog' in self.__dict__:
				del self.__dict__['changelog']
				if 'changelog' in self._filecache:
				del self._filecache['changelog']
				# This calls "updatecachess" and will pick up the new changelog.i.
				super(clindexrepo, self).destroyed()

				unfi.__class__ = clindexrepo

	def uisetup(ui):			def uisetup(ui):
	extensions.wrapfunction(changelog.changelog, '__init__', _changeloginit)			# uisetup has side effects depending on configs. Mark [clindex] config
				# section sensitive so chg works correctly.
				chgserver._configsections.append('clindex')

				# filecache method has to be wrapped using wrapfilecache
				extensions.wrapfilecache(localrepo.localrepository, 'changelog',
				_wrapchangelog)

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hgext3rd/clindex.pyx

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clindex: integrate Rust nodemapClosedPublic

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hgext3rd/clindex.pyx

clindex: integrate Rust nodemap
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