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# remotefilelogserver.py - server logic for a remotefilelog server
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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 __future__ import absolute_import
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import errno
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import os
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import stat
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import time
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from mercurial.i18n import _
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from mercurial.node import bin, hex, nullid, nullrev
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from mercurial import (
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ancestor,
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changegroup,
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changelog,
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context,
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error,
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extensions,
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match,
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pycompat,
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store,
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streamclone,
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util,
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wireprotoserver,
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wireprototypes,
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wireprotov1server,
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)
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from . import (
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constants,
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lz4wrapper,
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shallowrepo,
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shallowutil,
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wirepack,
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)
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_sshv1server = wireprotoserver.sshv1protocolhandler
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def setupserver(ui, repo):
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"""Sets up a normal Mercurial repo so it can serve files to shallow repos.
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"""
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onetimesetup(ui)
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# don't send files to shallow clients during pulls
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def generatefiles(orig, self, changedfiles, linknodes, commonrevs, source,
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*args, **kwargs):
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caps = self._bundlecaps or []
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if shallowrepo.requirement in caps:
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# only send files that don't match the specified patterns
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includepattern = None
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excludepattern = None
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for cap in (self._bundlecaps or []):
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if cap.startswith("includepattern="):
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includepattern = cap[len("includepattern="):].split('\0')
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elif cap.startswith("excludepattern="):
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excludepattern = cap[len("excludepattern="):].split('\0')
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m = match.always(repo.root, '')
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if includepattern or excludepattern:
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m = match.match(repo.root, '', None,
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includepattern, excludepattern)
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changedfiles = list([f for f in changedfiles if not m(f)])
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return orig(self, changedfiles, linknodes, commonrevs, source,
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*args, **kwargs)
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extensions.wrapfunction(
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changegroup.cgpacker, 'generatefiles', generatefiles)
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onetime = False
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def onetimesetup(ui):
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"""Configures the wireprotocol for both clients and servers.
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"""
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global onetime
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if onetime:
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return
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onetime = True
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# support file content requests
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wireprotov1server.wireprotocommand(
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'getflogheads', 'path', permission='pull')(getflogheads)
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wireprotov1server.wireprotocommand(
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'getfiles', '', permission='pull')(getfiles)
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wireprotov1server.wireprotocommand(
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'getfile', 'file node', permission='pull')(getfile)
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wireprotov1server.wireprotocommand(
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'getpackv1', '*', permission='pull')(getpack)
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class streamstate(object):
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match = None
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shallowremote = False
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noflatmf = False
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state = streamstate()
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def stream_out_shallow(repo, proto, other):
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includepattern = None
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excludepattern = None
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raw = other.get('includepattern')
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if raw:
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includepattern = raw.split('\0')
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raw = other.get('excludepattern')
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if raw:
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excludepattern = raw.split('\0')
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oldshallow = state.shallowremote
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oldmatch = state.match
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oldnoflatmf = state.noflatmf
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try:
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state.shallowremote = True
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state.match = match.always(repo.root, '')
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state.noflatmf = other.get('noflatmanifest') == 'True'
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if includepattern or excludepattern:
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state.match = match.match(repo.root, '', None,
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includepattern, excludepattern)
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streamres = wireprotov1server.stream(repo, proto)
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# Force the first value to execute, so the file list is computed
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# within the try/finally scope
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first = next(streamres.gen)
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second = next(streamres.gen)
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def gen():
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yield first
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yield second
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for value in streamres.gen:
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yield value
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return wireprototypes.streamres(gen())
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finally:
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state.shallowremote = oldshallow
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state.match = oldmatch
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state.noflatmf = oldnoflatmf
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wireprotov1server.commands['stream_out_shallow'] = (stream_out_shallow, '*')
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# don't clone filelogs to shallow clients
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def _walkstreamfiles(orig, repo):
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if state.shallowremote:
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# if we are shallow ourselves, stream our local commits
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if shallowrepo.requirement in repo.requirements:
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striplen = len(repo.store.path) + 1
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readdir = repo.store.rawvfs.readdir
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visit = [os.path.join(repo.store.path, 'data')]
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while visit:
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p = visit.pop()
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for f, kind, st in readdir(p, stat=True):
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fp = p + '/' + f
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if kind == stat.S_IFREG:
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if not fp.endswith('.i') and not fp.endswith('.d'):
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n = util.pconvert(fp[striplen:])
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yield (store.decodedir(n), n, st.st_size)
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if kind == stat.S_IFDIR:
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visit.append(fp)
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if 'treemanifest' in repo.requirements:
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for (u, e, s) in repo.store.datafiles():
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if (u.startswith('meta/') and
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(u.endswith('.i') or u.endswith('.d'))):
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yield (u, e, s)
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# Return .d and .i files that do not match the shallow pattern
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match = state.match
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if match and not match.always():
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for (u, e, s) in repo.store.datafiles():
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f = u[5:-2] # trim data/... and .i/.d
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if not state.match(f):
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yield (u, e, s)
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for x in repo.store.topfiles():
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if state.noflatmf and x[0][:11] == '00manifest.':
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continue
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yield x
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elif shallowrepo.requirement in repo.requirements:
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# don't allow cloning from a shallow repo to a full repo
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# since it would require fetching every version of every
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# file in order to create the revlogs.
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raise error.Abort(_("Cannot clone from a shallow repo "
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"to a full repo."))
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else:
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for x in orig(repo):
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yield x
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extensions.wrapfunction(streamclone, '_walkstreamfiles', _walkstreamfiles)
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# We no longer use getbundle_shallow commands, but we must still
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# support it for migration purposes
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def getbundleshallow(repo, proto, others):
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bundlecaps = others.get('bundlecaps', '')
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bundlecaps = set(bundlecaps.split(','))
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bundlecaps.add('remotefilelog')
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others['bundlecaps'] = ','.join(bundlecaps)
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return wireprotov1server.commands["getbundle"][0](repo, proto, others)
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wireprotov1server.commands["getbundle_shallow"] = (getbundleshallow, '*')
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# expose remotefilelog capabilities
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def _capabilities(orig, repo, proto):
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caps = orig(repo, proto)
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if ((shallowrepo.requirement in repo.requirements or
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ui.configbool('remotefilelog', 'server'))):
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if isinstance(proto, _sshv1server):
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# legacy getfiles method which only works over ssh
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caps.append(shallowrepo.requirement)
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caps.append('getflogheads')
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caps.append('getfile')
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return caps
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extensions.wrapfunction(wireprotov1server, '_capabilities', _capabilities)
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def _adjustlinkrev(orig, self, *args, **kwargs):
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# When generating file blobs, taking the real path is too slow on large
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# repos, so force it to just return the linkrev directly.
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repo = self._repo
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if util.safehasattr(repo, 'forcelinkrev') and repo.forcelinkrev:
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return self._filelog.linkrev(self._filelog.rev(self._filenode))
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return orig(self, *args, **kwargs)
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extensions.wrapfunction(
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context.basefilectx, '_adjustlinkrev', _adjustlinkrev)
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def _iscmd(orig, cmd):
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if cmd == 'getfiles':
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return False
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return orig(cmd)
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extensions.wrapfunction(wireprotoserver, 'iscmd', _iscmd)
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def _loadfileblob(repo, cachepath, path, node):
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filecachepath = os.path.join(cachepath, path, hex(node))
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if not os.path.exists(filecachepath) or os.path.getsize(filecachepath) == 0:
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filectx = repo.filectx(path, fileid=node)
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if filectx.node() == nullid:
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repo.changelog = changelog.changelog(repo.svfs)
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filectx = repo.filectx(path, fileid=node)
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text = createfileblob(filectx)
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text = lz4wrapper.lzcompresshc(text)
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# everything should be user & group read/writable
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oldumask = os.umask(0o002)
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try:
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dirname = os.path.dirname(filecachepath)
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if not os.path.exists(dirname):
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try:
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os.makedirs(dirname)
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except OSError as ex:
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if ex.errno != errno.EEXIST:
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raise
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f = None
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try:
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f = util.atomictempfile(filecachepath, "w")
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f.write(text)
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except (IOError, OSError):
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# Don't abort if the user only has permission to read,
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# and not write.
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pass
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finally:
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if f:
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f.close()
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finally:
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os.umask(oldumask)
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else:
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with open(filecachepath, "r") as f:
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text = f.read()
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return text
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def getflogheads(repo, proto, path):
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"""A server api for requesting a filelog's heads
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"""
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flog = repo.file(path)
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heads = flog.heads()
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return '\n'.join((hex(head) for head in heads if head != nullid))
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def getfile(repo, proto, file, node):
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"""A server api for requesting a particular version of a file. Can be used
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in batches to request many files at once. The return protocol is:
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<errorcode>\0<data/errormsg> where <errorcode> is 0 for success or
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non-zero for an error.
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data is a compressed blob with revlog flag and ancestors information. See
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createfileblob for its content.
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"""
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if shallowrepo.requirement in repo.requirements:
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return '1\0' + _('cannot fetch remote files from shallow repo')
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cachepath = repo.ui.config("remotefilelog", "servercachepath")
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if not cachepath:
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cachepath = os.path.join(repo.path, "remotefilelogcache")
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node = bin(node.strip())
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if node == nullid:
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return '0\0'
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return '0\0' + _loadfileblob(repo, cachepath, file, node)
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def getfiles(repo, proto):
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"""A server api for requesting particular versions of particular files.
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"""
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if shallowrepo.requirement in repo.requirements:
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raise error.Abort(_('cannot fetch remote files from shallow repo'))
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if not isinstance(proto, _sshv1server):
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raise error.Abort(_('cannot fetch remote files over non-ssh protocol'))
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def streamer():
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fin = proto._fin
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cachepath = repo.ui.config("remotefilelog", "servercachepath")
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if not cachepath:
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cachepath = os.path.join(repo.path, "remotefilelogcache")
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while True:
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request = fin.readline()[:-1]
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if not request:
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break
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node = bin(request[:40])
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if node == nullid:
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yield '0\n'
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continue
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path = request[40:]
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text = _loadfileblob(repo, cachepath, path, node)
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yield '%d\n%s' % (len(text), text)
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# it would be better to only flush after processing a whole batch
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# but currently we don't know if there are more requests coming
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proto._fout.flush()
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return wireprototypes.streamres(streamer())
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def createfileblob(filectx):
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"""
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format:
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v0:
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str(len(rawtext)) + '\0' + rawtext + ancestortext
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v1:
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'v1' + '\n' + metalist + '\0' + rawtext + ancestortext
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metalist := metalist + '\n' + meta | meta
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meta := sizemeta | flagmeta
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sizemeta := METAKEYSIZE + str(len(rawtext))
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flagmeta := METAKEYFLAG + str(flag)
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note: sizemeta must exist. METAKEYFLAG and METAKEYSIZE must have a
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length of 1.
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"""
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flog = filectx.filelog()
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frev = filectx.filerev()
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revlogflags = flog._revlog.flags(frev)
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if revlogflags == 0:
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# normal files
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text = filectx.data()
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else:
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# lfs, read raw revision data
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text = flog.revision(frev, raw=True)
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repo = filectx._repo
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ancestors = [filectx]
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try:
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repo.forcelinkrev = True
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ancestors.extend([f for f in filectx.ancestors()])
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ancestortext = ""
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for ancestorctx in ancestors:
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parents = ancestorctx.parents()
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p1 = nullid
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p2 = nullid
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if len(parents) > 0:
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p1 = parents[0].filenode()
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if len(parents) > 1:
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p2 = parents[1].filenode()
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copyname = ""
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rename = ancestorctx.renamed()
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if rename:
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copyname = rename[0]
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linknode = ancestorctx.node()
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ancestortext += "%s%s%s%s%s\0" % (
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ancestorctx.filenode(), p1, p2, linknode,
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copyname)
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finally:
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repo.forcelinkrev = False
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header = shallowutil.buildfileblobheader(len(text), revlogflags)
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return "%s\0%s%s" % (header, text, ancestortext)
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def gcserver(ui, repo):
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if not repo.ui.configbool("remotefilelog", "server"):
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return
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neededfiles = set()
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heads = repo.revs("heads(tip~25000:) - null")
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cachepath = repo.vfs.join("remotefilelogcache")
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for head in heads:
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mf = repo[head].manifest()
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for filename, filenode in mf.iteritems():
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filecachepath = os.path.join(cachepath, filename, hex(filenode))
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neededfiles.add(filecachepath)
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# delete unneeded older files
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days = repo.ui.configint("remotefilelog", "serverexpiration")
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expiration = time.time() - (days * 24 * 60 * 60)
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_removing = _("removing old server cache")
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count = 0
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ui.progress(_removing, count, unit="files")
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for root, dirs, files in os.walk(cachepath):
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for file in files:
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filepath = os.path.join(root, file)
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count += 1
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ui.progress(_removing, count, unit="files")
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if filepath in neededfiles:
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continue
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stat = os.stat(filepath)
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if stat.st_mtime < expiration:
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os.remove(filepath)
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ui.progress(_removing, None)
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def getpack(repo, proto, args):
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"""A server api for requesting a pack of file information.
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"""
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if shallowrepo.requirement in repo.requirements:
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raise error.Abort(_('cannot fetch remote files from shallow repo'))
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if not isinstance(proto, _sshv1server):
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raise error.Abort(_('cannot fetch remote files over non-ssh protocol'))
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def streamer():
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"""Request format:
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[<filerequest>,...]\0\0
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filerequest = <filename len: 2 byte><filename><count: 4 byte>
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[<node: 20 byte>,...]
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Response format:
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[<fileresponse>,...]<10 null bytes>
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fileresponse = <filename len: 2 byte><filename><history><deltas>
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history = <count: 4 byte>[<history entry>,...]
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historyentry = <node: 20 byte><p1: 20 byte><p2: 20 byte>
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<linknode: 20 byte><copyfrom len: 2 byte><copyfrom>
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deltas = <count: 4 byte>[<delta entry>,...]
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deltaentry = <node: 20 byte><deltabase: 20 byte>
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<delta len: 8 byte><delta>
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"""
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fin = proto._fin
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files = _receivepackrequest(fin)
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# Sort the files by name, so we provide deterministic results
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for filename, nodes in sorted(files.iteritems()):
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fl = repo.file(filename)
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# Compute history
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history = []
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for rev in ancestor.lazyancestors(fl.parentrevs,
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[fl.rev(n) for n in nodes],
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inclusive=True):
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linkrev = fl.linkrev(rev)
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node = fl.node(rev)
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p1node, p2node = fl.parents(node)
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copyfrom = ''
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linknode = repo.changelog.node(linkrev)
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if p1node == nullid:
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copydata = fl.renamed(node)
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if copydata:
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copyfrom, copynode = copydata
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p1node = copynode
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history.append((node, p1node, p2node, linknode, copyfrom))
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# Scan and send deltas
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chain = _getdeltachain(fl, nodes, -1)
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for chunk in wirepack.sendpackpart(filename, history, chain):
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yield chunk
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yield wirepack.closepart()
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proto._fout.flush()
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return wireprototypes.streamres(streamer())
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def _receivepackrequest(stream):
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files = {}
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while True:
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filenamelen = shallowutil.readunpack(stream,
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constants.FILENAMESTRUCT)[0]
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if filenamelen == 0:
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break
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filename = shallowutil.readexactly(stream, filenamelen)
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nodecount = shallowutil.readunpack(stream,
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constants.PACKREQUESTCOUNTSTRUCT)[0]
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# Read N nodes
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nodes = shallowutil.readexactly(stream, constants.NODESIZE * nodecount)
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nodes = set(nodes[i:i + constants.NODESIZE] for i in
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pycompat.xrange(0, len(nodes), constants.NODESIZE))
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files[filename] = nodes
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return files
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def _getdeltachain(fl, nodes, stophint):
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"""Produces a chain of deltas that includes each of the given nodes.
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`stophint` - The changeset rev number to stop at. If it's set to >= 0, we
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will return not only the deltas for the requested nodes, but also all
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necessary deltas in their delta chains, as long as the deltas have link revs
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>= the stophint. This allows us to return an approximately minimal delta
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chain when the user performs a pull. If `stophint` is set to -1, all nodes
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will return full texts. """
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chain = []
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seen = set()
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for node in nodes:
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startrev = fl.rev(node)
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cur = startrev
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while True:
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if cur in seen:
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break
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base = fl._revlog.deltaparent(cur)
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linkrev = fl.linkrev(cur)
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node = fl.node(cur)
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p1, p2 = fl.parentrevs(cur)
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if linkrev < stophint and cur != startrev:
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break
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# Return a full text if:
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# - the caller requested it (via stophint == -1)
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# - the revlog chain has ended (via base==null or base==node)
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# - p1 is null. In some situations this can mean it's a copy, so
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# we need to use fl.read() to remove the copymetadata.
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if (stophint == -1 or base == nullrev or base == cur
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or p1 == nullrev):
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delta = fl.read(cur)
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base = nullrev
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else:
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delta = fl._chunk(cur)
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basenode = fl.node(base)
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chain.append((node, basenode, delta))
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seen.add(cur)
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if base == nullrev:
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break
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cur = base
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chain.reverse()
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return chain
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