mercurial/repocache.py
author Gregory Szorc <gregory.szorc@gmail.com>
Mon, 21 Feb 2022 13:08:28 -0700
changeset 48946 642e31cb55f0
parent 48875 6000f5b25c9b
child 51106 d83d788590a8
permissions -rw-r--r--
py3: use class X: instead of class X(object): The inheritance from object is implied in Python 3. So this should be equivalent. This change was generated via an automated search and replace. So there may have been some accidental changes. Differential Revision: https://phab.mercurial-scm.org/D12352
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# repocache.py - in-memory repository cache for long-running services
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#
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# Copyright 2018 Yuya Nishihara <yuya@tcha.org>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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import collections
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import gc
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import threading
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from . import (
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    error,
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    hg,
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    obsolete,
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    scmutil,
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    util,
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)
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class repoloader:
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    """Load repositories in background thread
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    This is designed for a forking server. A cached repo cannot be obtained
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    until the server fork()s a worker and the loader thread stops.
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    """
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    def __init__(self, ui, maxlen):
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        self._ui = ui.copy()
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        self._cache = util.lrucachedict(max=maxlen)
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        # use deque and Event instead of Queue since deque can discard
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        # old items to keep at most maxlen items.
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        self._inqueue = collections.deque(maxlen=maxlen)
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        self._accepting = False
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        self._newentry = threading.Event()
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        self._thread = None
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    def start(self):
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        assert not self._thread
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        if self._inqueue.maxlen == 0:
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            # no need to spawn loader thread as the cache is disabled
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            return
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        self._accepting = True
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        self._thread = threading.Thread(target=self._mainloop)
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        self._thread.start()
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    def stop(self):
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        if not self._thread:
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            return
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        self._accepting = False
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        self._newentry.set()
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        self._thread.join()
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        self._thread = None
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        self._cache.clear()
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        self._inqueue.clear()
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    def load(self, path):
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        """Request to load the specified repository in background"""
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        self._inqueue.append(path)
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        self._newentry.set()
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    def get(self, path):
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        """Return a cached repo if available
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        This function must be called after fork(), where the loader thread
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        is stopped. Otherwise, the returned repo might be updated by the
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        loader thread.
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        """
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        if self._thread and self._thread.is_alive():
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            raise error.ProgrammingError(
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                b'cannot obtain cached repo while loader is active'
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            )
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        return self._cache.peek(path, None)
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    def _mainloop(self):
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        while self._accepting:
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            # Avoid heavy GC after fork(), which would cancel the benefit of
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            # COW. We assume that GIL is acquired while GC is underway in the
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            # loader thread. If that isn't true, we might have to move
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            # gc.collect() to the main thread so that fork() would never stop
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            # the thread where GC is in progress.
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            gc.collect()
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            self._newentry.wait()
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            while self._accepting:
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                self._newentry.clear()
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                try:
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                    path = self._inqueue.popleft()
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                except IndexError:
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                    break
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                scmutil.callcatch(self._ui, lambda: self._load(path))
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    def _load(self, path):
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        start = util.timer()
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        # TODO: repo should be recreated if storage configuration changed
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        try:
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            # pop before loading so inconsistent state wouldn't be exposed
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            repo = self._cache.pop(path)
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        except KeyError:
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            repo = hg.repository(self._ui, path).unfiltered()
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        _warmupcache(repo)
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        repo.ui.log(
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            b'repocache',
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            b'loaded repo into cache: %s (in %.3fs)\n',
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            path,
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            util.timer() - start,
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        )
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        self._cache.insert(path, repo)
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# TODO: think about proper API of preloading cache
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def _warmupcache(repo):
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    repo.invalidateall()
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    repo.changelog
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    repo.obsstore._all
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    repo.obsstore.successors
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    repo.obsstore.predecessors
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    repo.obsstore.children
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    for name in obsolete.cachefuncs:
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        obsolete.getrevs(repo, name)
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    repo._phasecache.loadphaserevs(repo)
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# TODO: think about proper API of attaching preloaded attributes
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def copycache(srcrepo, destrepo):
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    """Copy cached attributes from srcrepo to destrepo"""
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    destfilecache = destrepo._filecache
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    srcfilecache = srcrepo._filecache
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    if b'changelog' in srcfilecache:
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        destfilecache[b'changelog'] = ce = srcfilecache[b'changelog']
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        ce.obj.opener = ce.obj._realopener = destrepo.svfs
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    if b'obsstore' in srcfilecache:
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        destfilecache[b'obsstore'] = ce = srcfilecache[b'obsstore']
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        ce.obj.svfs = destrepo.svfs
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    if b'_phasecache' in srcfilecache:
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        destfilecache[b'_phasecache'] = ce = srcfilecache[b'_phasecache']
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        ce.obj.opener = destrepo.svfs