mirror of
https://github.com/facebook/sapling.git
synced 2024-10-11 01:07:15 +03:00
8ca8f7f6ca
The old way of fetching from the server required the base store api expose a way for outside callers to add fetch handlers to the store. This exposed some of the underlying details of how data is fetched in an unnecessary way and added an awkward subscription api. Let's just treat our remote caches as another store we can fetch from, and require that the over arching configure logic (in shallowrepo.py) can connect all our stores together in a union store.
183 lines
7.4 KiB
Python
183 lines
7.4 KiB
Python
# shallowrepo.py - shallow repository that uses remote filelogs
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#
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# Copyright 2013 Facebook, Inc.
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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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from mercurial.node import hex, nullid, nullrev, bin
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from mercurial.i18n import _
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from mercurial import localrepo, context, util, match, scmutil
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from mercurial.extensions import wrapfunction
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import remotefilelog, remotefilectx, fileserverclient, shallowbundle, os
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from contentstore import remotefilelogcontentstore, unioncontentstore, remotecontentstore
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from metadatastore import remotefilelogmetadatastore, unionmetadatastore, remotemetadatastore
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requirement = "remotefilelog"
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def wraprepo(repo):
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class shallowrepository(repo.__class__):
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@util.propertycache
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def name(self):
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return self.ui.config('remotefilelog', 'reponame', '')
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@util.propertycache
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def fallbackpath(self):
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return repo.ui.config("remotefilelog", "fallbackpath",
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# fallbackrepo is the old, deprecated name
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repo.ui.config("remotefilelog", "fallbackrepo",
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repo.ui.config("paths", "default")))
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def sparsematch(self, *revs, **kwargs):
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baseinstance = super(shallowrepository, self)
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if util.safehasattr(baseinstance, 'sparsematch'):
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return baseinstance.sparsematch(*revs, **kwargs)
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return None
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def file(self, f):
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if f[0] == '/':
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f = f[1:]
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if self.shallowmatch(f):
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return remotefilelog.remotefilelog(self.svfs, f, self)
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else:
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return super(shallowrepository, self).file(f)
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def filectx(self, path, changeid=None, fileid=None):
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if self.shallowmatch(path):
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return remotefilectx.remotefilectx(self, path, changeid, fileid)
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else:
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return super(shallowrepository, self).filectx(path, changeid, fileid)
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@localrepo.unfilteredmethod
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def commitctx(self, ctx, error=False):
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"""Add a new revision to current repository.
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Revision information is passed via the context argument.
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"""
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# prefetch files that will likely be compared
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m1 = ctx.p1().manifest()
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files = []
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for f in ctx.modified() + ctx.added():
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fparent1 = m1.get(f, nullid)
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if fparent1 != nullid:
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files.append((f, hex(fparent1)))
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self.fileservice.prefetch(files)
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return super(shallowrepository, self).commitctx(ctx, error=error)
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def prefetch(self, revs, base=None, pats=None, opts=None):
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"""Prefetches all the necessary file revisions for the given revs
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"""
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fallbackpath = self.fallbackpath
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if fallbackpath:
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# If we know a rev is on the server, we should fetch the server
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# version of those files, since our local file versions might
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# become obsolete if the local commits are stripped.
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localrevs = repo.revs('outgoing(%s)', fallbackpath)
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if base is not None and base != nullrev:
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serverbase = list(repo.revs('first(reverse(::%s) - %ld)', base,
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localrevs))
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if serverbase:
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base = serverbase[0]
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else:
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localrevs = repo
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mf = repo.manifest
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if base is not None:
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mfdict = mf.read(repo[base].manifestnode())
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skip = set(mfdict.iteritems())
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else:
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skip = set()
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# Copy the skip set to start large and avoid constant resizing,
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# and since it's likely to be very similar to the prefetch set.
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files = skip.copy()
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serverfiles = skip.copy()
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visited = set()
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visited.add(nullrev)
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for rev in sorted(revs):
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ctx = repo[rev]
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if pats:
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m = scmutil.match(ctx, pats, opts)
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sparsematch = repo.sparsematch(rev)
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mfnode = ctx.manifestnode()
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mfrev = mf.rev(mfnode)
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# Decompressing manifests is expensive.
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# When possible, only read the deltas.
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p1, p2 = mf.parentrevs(mfrev)
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if p1 in visited and p2 in visited:
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mfdict = mf.readfast(mfnode)
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else:
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mfdict = mf.read(mfnode)
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diff = mfdict.iteritems()
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if pats:
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diff = (pf for pf in diff if m(pf[0]))
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if sparsematch:
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diff = (pf for pf in diff if sparsematch(pf[0]))
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if rev not in localrevs:
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serverfiles.update(diff)
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else:
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files.update(diff)
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visited.add(mfrev)
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files.difference_update(skip)
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serverfiles.difference_update(skip)
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# Fetch files known to be on the server
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if serverfiles:
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results = [(path, hex(fnode)) for (path, fnode) in serverfiles]
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repo.fileservice.prefetch(results, force=True)
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# Fetch files that may or may not be on the server
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if files:
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results = [(path, hex(fnode)) for (path, fnode) in files]
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repo.fileservice.prefetch(results)
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repo.__class__ = shallowrepository
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repo.shallowmatch = match.always(repo.root, '')
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localpath = os.path.join(repo.svfs.vfs.base, 'data')
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if not os.path.exists(localpath):
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os.makedirs(localpath)
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# Instantiate local data stores
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localcontent = remotefilelogcontentstore(repo.ui, localpath, repo.name,
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shared=False)
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localmetadata = remotefilelogmetadatastore(repo.ui, localpath, repo.name,
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shared=False)
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# Instantiate shared cache stores
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cachepath = repo.ui.config("remotefilelog", "cachepath")
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if not cachepath:
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raise util.Abort(_("could not find config option remotefilelog.cachepath"))
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cachecontent = remotefilelogcontentstore(repo.ui, cachepath, repo.name,
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shared=True)
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cachemetadata = remotefilelogmetadatastore(repo.ui, cachepath, repo.name,
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shared=True)
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# Instantiate remote stores
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repo.fileservice = fileserverclient.fileserverclient(repo)
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remotecontent = remotecontentstore(repo.ui, repo.fileservice, cachecontent)
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remotemetadata = remotemetadatastore(repo.ui, repo.fileservice, cachemetadata)
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# Instantiate union stores
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repo.contentstore = unioncontentstore(localcontent, cachecontent, remotecontent)
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repo.metadatastore = unionmetadatastore(localmetadata, cachemetadata, remotemetadata)
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repo.fileservice.setstore(repo.contentstore)
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repo.includepattern = repo.ui.configlist("remotefilelog", "includepattern", None)
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repo.excludepattern = repo.ui.configlist("remotefilelog", "excludepattern", None)
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if repo.includepattern or repo.excludepattern:
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repo.shallowmatch = match.match(repo.root, '', None,
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repo.includepattern, repo.excludepattern)
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localpath = os.path.join(repo.svfs.vfs.base, 'data')
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if not os.path.exists(localpath):
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os.makedirs(localpath)
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