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# fileserverclient.py - client for communicating with the cache process
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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 hashlib
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import io
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import os
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import threading
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import time
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import zlib
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from mercurial.i18n import _
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from mercurial.node import bin, hex, nullid
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from mercurial import (
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error,
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node,
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pycompat,
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revlog,
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sshpeer,
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util,
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wireprotov1peer,
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)
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from mercurial.utils import procutil
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from . import (
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constants,
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contentstore,
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metadatastore,
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)
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_sshv1peer = sshpeer.sshv1peer
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# Statistics for debugging
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fetchcost = 0
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fetches = 0
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fetched = 0
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fetchmisses = 0
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_lfsmod = None
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def getcachekey(reponame, file, id):
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pathhash = node.hex(hashlib.sha1(file).digest())
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return os.path.join(reponame, pathhash[:2], pathhash[2:], id)
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def getlocalkey(file, id):
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pathhash = node.hex(hashlib.sha1(file).digest())
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return os.path.join(pathhash, id)
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def peersetup(ui, peer):
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class remotefilepeer(peer.__class__):
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@wireprotov1peer.batchable
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def x_rfl_getfile(self, file, node):
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if not self.capable('x_rfl_getfile'):
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raise error.Abort(
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'configured remotefile server does not support getfile')
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f = wireprotov1peer.future()
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yield {'file': file, 'node': node}, f
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code, data = f.value.split('\0', 1)
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if int(code):
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raise error.LookupError(file, node, data)
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yield data
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@wireprotov1peer.batchable
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def x_rfl_getflogheads(self, path):
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if not self.capable('x_rfl_getflogheads'):
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raise error.Abort('configured remotefile server does not '
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'support getflogheads')
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f = wireprotov1peer.future()
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yield {'path': path}, f
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heads = f.value.split('\n') if f.value else []
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yield heads
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def _updatecallstreamopts(self, command, opts):
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if command != 'getbundle':
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return
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if (constants.NETWORK_CAP_LEGACY_SSH_GETFILES
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not in self.capabilities()):
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return
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if not util.safehasattr(self, '_localrepo'):
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return
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if (constants.SHALLOWREPO_REQUIREMENT
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not in self._localrepo.requirements):
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return
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bundlecaps = opts.get('bundlecaps')
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if bundlecaps:
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bundlecaps = [bundlecaps]
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else:
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bundlecaps = []
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# shallow, includepattern, and excludepattern are a hacky way of
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# carrying over data from the local repo to this getbundle
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# command. We need to do it this way because bundle1 getbundle
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# doesn't provide any other place we can hook in to manipulate
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# getbundle args before it goes across the wire. Once we get rid
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# of bundle1, we can use bundle2's _pullbundle2extraprepare to
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# do this more cleanly.
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bundlecaps.append(constants.BUNDLE2_CAPABLITY)
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if self._localrepo.includepattern:
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patterns = '\0'.join(self._localrepo.includepattern)
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includecap = "includepattern=" + patterns
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bundlecaps.append(includecap)
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if self._localrepo.excludepattern:
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patterns = '\0'.join(self._localrepo.excludepattern)
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excludecap = "excludepattern=" + patterns
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bundlecaps.append(excludecap)
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opts['bundlecaps'] = ','.join(bundlecaps)
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def _sendrequest(self, command, args, **opts):
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self._updatecallstreamopts(command, args)
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return super(remotefilepeer, self)._sendrequest(command, args,
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**opts)
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def _callstream(self, command, **opts):
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supertype = super(remotefilepeer, self)
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if not util.safehasattr(supertype, '_sendrequest'):
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self._updatecallstreamopts(command, pycompat.byteskwargs(opts))
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return super(remotefilepeer, self)._callstream(command, **opts)
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peer.__class__ = remotefilepeer
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class cacheconnection(object):
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"""The connection for communicating with the remote cache. Performs
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gets and sets by communicating with an external process that has the
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cache-specific implementation.
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"""
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def __init__(self):
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self.pipeo = self.pipei = self.pipee = None
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self.subprocess = None
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self.connected = False
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def connect(self, cachecommand):
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if self.pipeo:
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raise error.Abort(_("cache connection already open"))
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self.pipei, self.pipeo, self.pipee, self.subprocess = (
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procutil.popen4(cachecommand))
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self.connected = True
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def close(self):
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def tryclose(pipe):
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try:
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pipe.close()
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except Exception:
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pass
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if self.connected:
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try:
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self.pipei.write("exit\n")
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except Exception:
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pass
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tryclose(self.pipei)
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self.pipei = None
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tryclose(self.pipeo)
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self.pipeo = None
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tryclose(self.pipee)
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self.pipee = None
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try:
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# Wait for process to terminate, making sure to avoid deadlock.
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# See https://docs.python.org/2/library/subprocess.html for
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# warnings about wait() and deadlocking.
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self.subprocess.communicate()
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except Exception:
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pass
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self.subprocess = None
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self.connected = False
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def request(self, request, flush=True):
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if self.connected:
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try:
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self.pipei.write(request)
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if flush:
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self.pipei.flush()
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except IOError:
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self.close()
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def receiveline(self):
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if not self.connected:
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return None
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try:
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result = self.pipeo.readline()[:-1]
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if not result:
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self.close()
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except IOError:
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self.close()
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return result
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def _getfilesbatch(
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remote, receivemissing, progresstick, missed, idmap, batchsize):
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# Over http(s), iterbatch is a streamy method and we can start
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# looking at results early. This means we send one (potentially
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# large) request, but then we show nice progress as we process
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# file results, rather than showing chunks of $batchsize in
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# progress.
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#
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# Over ssh, iterbatch isn't streamy because batch() wasn't
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# explicitly designed as a streaming method. In the future we
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# should probably introduce a streambatch() method upstream and
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# use that for this.
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with remote.commandexecutor() as e:
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futures = []
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for m in missed:
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futures.append(e.callcommand('x_rfl_getfile', {
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'file': idmap[m],
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'node': m[-40:]
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}))
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for i, m in enumerate(missed):
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r = futures[i].result()
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futures[i] = None # release memory
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file_ = idmap[m]
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node = m[-40:]
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receivemissing(io.BytesIO('%d\n%s' % (len(r), r)), file_, node)
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progresstick()
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def _getfiles_optimistic(
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remote, receivemissing, progresstick, missed, idmap, step):
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remote._callstream("x_rfl_getfiles")
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i = 0
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pipeo = remote._pipeo
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pipei = remote._pipei
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while i < len(missed):
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# issue a batch of requests
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start = i
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end = min(len(missed), start + step)
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i = end
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for missingid in missed[start:end]:
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# issue new request
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versionid = missingid[-40:]
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file = idmap[missingid]
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sshrequest = "%s%s\n" % (versionid, file)
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pipeo.write(sshrequest)
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pipeo.flush()
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# receive batch results
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for missingid in missed[start:end]:
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versionid = missingid[-40:]
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file = idmap[missingid]
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receivemissing(pipei, file, versionid)
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progresstick()
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# End the command
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pipeo.write('\n')
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pipeo.flush()
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def _getfiles_threaded(
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remote, receivemissing, progresstick, missed, idmap, step):
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remote._callstream("getfiles")
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pipeo = remote._pipeo
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pipei = remote._pipei
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def writer():
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for missingid in missed:
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versionid = missingid[-40:]
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file = idmap[missingid]
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sshrequest = "%s%s\n" % (versionid, file)
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pipeo.write(sshrequest)
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pipeo.flush()
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writerthread = threading.Thread(target=writer)
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writerthread.daemon = True
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writerthread.start()
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for missingid in missed:
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versionid = missingid[-40:]
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file = idmap[missingid]
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receivemissing(pipei, file, versionid)
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progresstick()
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writerthread.join()
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# End the command
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pipeo.write('\n')
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pipeo.flush()
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class fileserverclient(object):
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"""A client for requesting files from the remote file server.
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"""
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def __init__(self, repo):
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ui = repo.ui
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self.repo = repo
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self.ui = ui
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self.cacheprocess = ui.config("remotefilelog", "cacheprocess")
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if self.cacheprocess:
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self.cacheprocess = util.expandpath(self.cacheprocess)
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# This option causes remotefilelog to pass the full file path to the
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# cacheprocess instead of a hashed key.
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self.cacheprocesspasspath = ui.configbool(
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"remotefilelog", "cacheprocess.includepath")
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self.debugoutput = ui.configbool("remotefilelog", "debug")
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self.remotecache = cacheconnection()
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def setstore(self, datastore, historystore, writedata, writehistory):
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self.datastore = datastore
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self.historystore = historystore
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self.writedata = writedata
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self.writehistory = writehistory
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def _connect(self):
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return self.repo.connectionpool.get(self.repo.fallbackpath)
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def request(self, fileids):
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"""Takes a list of filename/node pairs and fetches them from the
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server. Files are stored in the local cache.
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A list of nodes that the server couldn't find is returned.
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If the connection fails, an exception is raised.
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"""
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if not self.remotecache.connected:
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self.connect()
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cache = self.remotecache
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writedata = self.writedata
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repo = self.repo
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total = len(fileids)
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request = "get\n%d\n" % total
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idmap = {}
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reponame = repo.name
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for file, id in fileids:
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fullid = getcachekey(reponame, file, id)
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if self.cacheprocesspasspath:
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request += file + '\0'
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request += fullid + "\n"
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idmap[fullid] = file
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cache.request(request)
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progress = self.ui.makeprogress(_('downloading'), total=total)
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progress.update(0)
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missed = []
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while True:
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missingid = cache.receiveline()
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if not missingid:
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missedset = set(missed)
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for missingid in idmap:
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if not missingid in missedset:
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missed.append(missingid)
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self.ui.warn(_("warning: cache connection closed early - " +
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"falling back to server\n"))
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break
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if missingid == "0":
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break
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if missingid.startswith("_hits_"):
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# receive progress reports
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parts = missingid.split("_")
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progress.increment(int(parts[2]))
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continue
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missed.append(missingid)
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global fetchmisses
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fetchmisses += len(missed)
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fromcache = total - len(missed)
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progress.update(fromcache, total=total)
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self.ui.log("remotefilelog", "remote cache hit rate is %r of %r\n",
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fromcache, total, hit=fromcache, total=total)
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oldumask = os.umask(0o002)
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try:
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# receive cache misses from master
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if missed:
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# When verbose is true, sshpeer prints 'running ssh...'
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# to stdout, which can interfere with some command
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# outputs
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verbose = self.ui.verbose
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self.ui.verbose = False
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try:
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with self._connect() as conn:
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remote = conn.peer
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if remote.capable(
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constants.NETWORK_CAP_LEGACY_SSH_GETFILES):
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if not isinstance(remote, _sshv1peer):
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raise error.Abort('remotefilelog requires ssh '
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'servers')
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step = self.ui.configint('remotefilelog',
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'getfilesstep')
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getfilestype = self.ui.config('remotefilelog',
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'getfilestype')
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if getfilestype == 'threaded':
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_getfiles = _getfiles_threaded
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else:
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_getfiles = _getfiles_optimistic
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_getfiles(remote, self.receivemissing,
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progress.increment, missed, idmap, step)
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elif remote.capable("x_rfl_getfile"):
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if remote.capable('batch'):
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batchdefault = 100
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else:
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batchdefault = 10
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batchsize = self.ui.configint(
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'remotefilelog', 'batchsize', batchdefault)
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_getfilesbatch(
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remote, self.receivemissing, progress.increment,
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missed, idmap, batchsize)
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else:
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raise error.Abort("configured remotefilelog server"
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" does not support remotefilelog")
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self.ui.log("remotefilefetchlog",
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"Success\n",
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fetched_files = progress.pos - fromcache,
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total_to_fetch = total - fromcache)
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except Exception:
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self.ui.log("remotefilefetchlog",
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"Fail\n",
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fetched_files = progress.pos - fromcache,
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total_to_fetch = total - fromcache)
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raise
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finally:
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self.ui.verbose = verbose
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# send to memcache
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request = "set\n%d\n%s\n" % (len(missed), "\n".join(missed))
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cache.request(request)
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progress.complete()
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# mark ourselves as a user of this cache
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writedata.markrepo(self.repo.path)
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finally:
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os.umask(oldumask)
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def receivemissing(self, pipe, filename, node):
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line = pipe.readline()[:-1]
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if not line:
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raise error.ResponseError(_("error downloading file contents:"),
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_("connection closed early"))
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size = int(line)
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data = pipe.read(size)
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if len(data) != size:
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raise error.ResponseError(_("error downloading file contents:"),
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_("only received %s of %s bytes")
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% (len(data), size))
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self.writedata.addremotefilelognode(filename, bin(node),
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zlib.decompress(data))
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def connect(self):
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if self.cacheprocess:
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cmd = "%s %s" % (self.cacheprocess, self.writedata._path)
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self.remotecache.connect(cmd)
|
|
|
else:
|
|
|
# If no cache process is specified, we fake one that always
|
|
|
# returns cache misses. This enables tests to run easily
|
|
|
# and may eventually allow us to be a drop in replacement
|
|
|
# for the largefiles extension.
|
|
|
class simplecache(object):
|
|
|
def __init__(self):
|
|
|
self.missingids = []
|
|
|
self.connected = True
|
|
|
|
|
|
def close(self):
|
|
|
pass
|
|
|
|
|
|
def request(self, value, flush=True):
|
|
|
lines = value.split("\n")
|
|
|
if lines[0] != "get":
|
|
|
return
|
|
|
self.missingids = lines[2:-1]
|
|
|
self.missingids.append('0')
|
|
|
|
|
|
def receiveline(self):
|
|
|
if len(self.missingids) > 0:
|
|
|
return self.missingids.pop(0)
|
|
|
return None
|
|
|
|
|
|
self.remotecache = simplecache()
|
|
|
|
|
|
def close(self):
|
|
|
if fetches:
|
|
|
msg = ("%d files fetched over %d fetches - " +
|
|
|
"(%d misses, %0.2f%% hit ratio) over %0.2fs\n") % (
|
|
|
fetched,
|
|
|
fetches,
|
|
|
fetchmisses,
|
|
|
float(fetched - fetchmisses) / float(fetched) * 100.0,
|
|
|
fetchcost)
|
|
|
if self.debugoutput:
|
|
|
self.ui.warn(msg)
|
|
|
self.ui.log("remotefilelog.prefetch", msg.replace("%", "%%"),
|
|
|
remotefilelogfetched=fetched,
|
|
|
remotefilelogfetches=fetches,
|
|
|
remotefilelogfetchmisses=fetchmisses,
|
|
|
remotefilelogfetchtime=fetchcost * 1000)
|
|
|
|
|
|
if self.remotecache.connected:
|
|
|
self.remotecache.close()
|
|
|
|
|
|
def prefetch(self, fileids, force=False, fetchdata=True,
|
|
|
fetchhistory=False):
|
|
|
"""downloads the given file versions to the cache
|
|
|
"""
|
|
|
repo = self.repo
|
|
|
idstocheck = []
|
|
|
for file, id in fileids:
|
|
|
# hack
|
|
|
# - we don't use .hgtags
|
|
|
# - workingctx produces ids with length 42,
|
|
|
# which we skip since they aren't in any cache
|
|
|
if (file == '.hgtags' or len(id) == 42
|
|
|
or not repo.shallowmatch(file)):
|
|
|
continue
|
|
|
|
|
|
idstocheck.append((file, bin(id)))
|
|
|
|
|
|
datastore = self.datastore
|
|
|
historystore = self.historystore
|
|
|
if force:
|
|
|
datastore = contentstore.unioncontentstore(*repo.shareddatastores)
|
|
|
historystore = metadatastore.unionmetadatastore(
|
|
|
*repo.sharedhistorystores)
|
|
|
|
|
|
missingids = set()
|
|
|
if fetchdata:
|
|
|
missingids.update(datastore.getmissing(idstocheck))
|
|
|
if fetchhistory:
|
|
|
missingids.update(historystore.getmissing(idstocheck))
|
|
|
|
|
|
# partition missing nodes into nullid and not-nullid so we can
|
|
|
# warn about this filtering potentially shadowing bugs.
|
|
|
nullids = len([None for unused, id in missingids if id == nullid])
|
|
|
if nullids:
|
|
|
missingids = [(f, id) for f, id in missingids if id != nullid]
|
|
|
repo.ui.develwarn(
|
|
|
('remotefilelog not fetching %d null revs'
|
|
|
' - this is likely hiding bugs' % nullids),
|
|
|
config='remotefilelog-ext')
|
|
|
if missingids:
|
|
|
global fetches, fetched, fetchcost
|
|
|
fetches += 1
|
|
|
|
|
|
# We want to be able to detect excess individual file downloads, so
|
|
|
# let's log that information for debugging.
|
|
|
if fetches >= 15 and fetches < 18:
|
|
|
if fetches == 15:
|
|
|
fetchwarning = self.ui.config('remotefilelog',
|
|
|
'fetchwarning')
|
|
|
if fetchwarning:
|
|
|
self.ui.warn(fetchwarning + '\n')
|
|
|
self.logstacktrace()
|
|
|
missingids = [(file, hex(id)) for file, id in missingids]
|
|
|
fetched += len(missingids)
|
|
|
start = time.time()
|
|
|
missingids = self.request(missingids)
|
|
|
if missingids:
|
|
|
raise error.Abort(_("unable to download %d files") %
|
|
|
len(missingids))
|
|
|
fetchcost += time.time() - start
|
|
|
self._lfsprefetch(fileids)
|
|
|
|
|
|
def _lfsprefetch(self, fileids):
|
|
|
if not _lfsmod or not util.safehasattr(
|
|
|
self.repo.svfs, 'lfslocalblobstore'):
|
|
|
return
|
|
|
if not _lfsmod.wrapper.candownload(self.repo):
|
|
|
return
|
|
|
pointers = []
|
|
|
store = self.repo.svfs.lfslocalblobstore
|
|
|
for file, id in fileids:
|
|
|
node = bin(id)
|
|
|
rlog = self.repo.file(file)
|
|
|
if rlog.flags(node) & revlog.REVIDX_EXTSTORED:
|
|
|
text = rlog.revision(node, raw=True)
|
|
|
p = _lfsmod.pointer.deserialize(text)
|
|
|
oid = p.oid()
|
|
|
if not store.has(oid):
|
|
|
pointers.append(p)
|
|
|
if len(pointers) > 0:
|
|
|
self.repo.svfs.lfsremoteblobstore.readbatch(pointers, store)
|
|
|
assert all(store.has(p.oid()) for p in pointers)
|
|
|
|
|
|
def logstacktrace(self):
|
|
|
import traceback
|
|
|
self.ui.log('remotefilelog', 'excess remotefilelog fetching:\n%s\n',
|
|
|
''.join(traceback.format_stack()))
|
|
|
|
