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# exchangev2.py - repository exchange for wire protocol version 2
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#
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# Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com>
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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 collections
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import weakref
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from .i18n import _
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from .node import (
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nullid,
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short,
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)
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from . import (
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bookmarks,
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error,
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mdiff,
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narrowspec,
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phases,
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pycompat,
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repository,
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setdiscovery,
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)
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def pull(pullop):
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"""Pull using wire protocol version 2."""
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repo = pullop.repo
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remote = pullop.remote
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usingrawchangelogandmanifest = _checkuserawstorefiledata(pullop)
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# If this is a clone and it was requested to perform a "stream clone",
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# we obtain the raw files data from the remote then fall back to an
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# incremental pull. This is somewhat hacky and is not nearly robust enough
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# for long-term usage.
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if usingrawchangelogandmanifest:
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with repo.transaction('clone'):
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_fetchrawstorefiles(repo, remote)
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repo.invalidate(clearfilecache=True)
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tr = pullop.trmanager.transaction()
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# We don't use the repo's narrow matcher here because the patterns passed
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# to exchange.pull() could be different.
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narrowmatcher = narrowspec.match(repo.root,
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# Empty maps to nevermatcher. So always
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# set includes if missing.
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pullop.includepats or {'path:.'},
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pullop.excludepats)
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if pullop.includepats or pullop.excludepats:
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pathfilter = {}
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if pullop.includepats:
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pathfilter[b'include'] = sorted(pullop.includepats)
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if pullop.excludepats:
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pathfilter[b'exclude'] = sorted(pullop.excludepats)
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else:
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pathfilter = None
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# Figure out what needs to be fetched.
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common, fetch, remoteheads = _pullchangesetdiscovery(
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repo, remote, pullop.heads, abortwhenunrelated=pullop.force)
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# And fetch the data.
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pullheads = pullop.heads or remoteheads
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csetres = _fetchchangesets(repo, tr, remote, common, fetch, pullheads)
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# New revisions are written to the changelog. But all other updates
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# are deferred. Do those now.
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# Ensure all new changesets are draft by default. If the repo is
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# publishing, the phase will be adjusted by the loop below.
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if csetres['added']:
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phases.registernew(repo, tr, phases.draft, csetres['added'])
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# And adjust the phase of all changesets accordingly.
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for phase in phases.phasenames:
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if phase == b'secret' or not csetres['nodesbyphase'][phase]:
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continue
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phases.advanceboundary(repo, tr, phases.phasenames.index(phase),
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csetres['nodesbyphase'][phase])
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# Write bookmark updates.
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bookmarks.updatefromremote(repo.ui, repo, csetres['bookmarks'],
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remote.url(), pullop.gettransaction,
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explicit=pullop.explicitbookmarks)
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manres = _fetchmanifests(repo, tr, remote, csetres['manifestnodes'])
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# We don't properly support shallow changeset and manifest yet. So we apply
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# depth limiting locally.
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if pullop.depth:
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relevantcsetnodes = set()
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clnode = repo.changelog.node
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for rev in repo.revs(b'ancestors(%ln, %d)',
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pullheads, pullop.depth - 1):
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relevantcsetnodes.add(clnode(rev))
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csetrelevantfilter = lambda n: n in relevantcsetnodes
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else:
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csetrelevantfilter = lambda n: True
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# If obtaining the raw store files, we need to scan the full repo to
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# derive all the changesets, manifests, and linkrevs.
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if usingrawchangelogandmanifest:
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csetsforfiles = []
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mnodesforfiles = []
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manifestlinkrevs = {}
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for rev in repo:
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ctx = repo[rev]
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node = ctx.node()
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if not csetrelevantfilter(node):
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continue
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mnode = ctx.manifestnode()
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csetsforfiles.append(node)
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mnodesforfiles.append(mnode)
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manifestlinkrevs[mnode] = rev
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else:
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csetsforfiles = [n for n in csetres['added'] if csetrelevantfilter(n)]
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mnodesforfiles = manres['added']
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manifestlinkrevs = manres['linkrevs']
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# Find all file nodes referenced by added manifests and fetch those
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# revisions.
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fnodes = _derivefilesfrommanifests(repo, narrowmatcher, mnodesforfiles)
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_fetchfilesfromcsets(repo, tr, remote, pathfilter, fnodes, csetsforfiles,
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manifestlinkrevs, shallow=bool(pullop.depth))
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def _checkuserawstorefiledata(pullop):
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"""Check whether we should use rawstorefiledata command to retrieve data."""
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repo = pullop.repo
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remote = pullop.remote
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# Command to obtain raw store data isn't available.
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if b'rawstorefiledata' not in remote.apidescriptor[b'commands']:
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return False
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# Only honor if user requested stream clone operation.
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if not pullop.streamclonerequested:
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return False
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# Only works on empty repos.
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if len(repo):
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return False
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# TODO This is super hacky. There needs to be a storage API for this. We
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# also need to check for compatibility with the remote.
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if b'revlogv1' not in repo.requirements:
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return False
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return True
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def _fetchrawstorefiles(repo, remote):
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with remote.commandexecutor() as e:
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objs = e.callcommand(b'rawstorefiledata', {
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b'files': [b'changelog', b'manifestlog'],
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}).result()
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# First object is a summary of files data that follows.
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overall = next(objs)
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progress = repo.ui.makeprogress(_('clone'), total=overall[b'totalsize'],
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unit=_('bytes'))
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with progress:
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progress.update(0)
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# Next are pairs of file metadata, data.
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while True:
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try:
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filemeta = next(objs)
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except StopIteration:
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break
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for k in (b'location', b'path', b'size'):
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if k not in filemeta:
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raise error.Abort(_(b'remote file data missing key: %s')
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% k)
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if filemeta[b'location'] == b'store':
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vfs = repo.svfs
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else:
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raise error.Abort(_(b'invalid location for raw file data: '
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b'%s') % filemeta[b'location'])
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bytesremaining = filemeta[b'size']
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with vfs.open(filemeta[b'path'], b'wb') as fh:
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while True:
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try:
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chunk = next(objs)
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except StopIteration:
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break
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bytesremaining -= len(chunk)
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if bytesremaining < 0:
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raise error.Abort(_(
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b'received invalid number of bytes for file '
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b'data; expected %d, got extra') %
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filemeta[b'size'])
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progress.increment(step=len(chunk))
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fh.write(chunk)
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try:
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if chunk.islast:
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break
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except AttributeError:
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raise error.Abort(_(
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b'did not receive indefinite length bytestring '
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b'for file data'))
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if bytesremaining:
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raise error.Abort(_(b'received invalid number of bytes for'
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b'file data; expected %d got %d') %
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(filemeta[b'size'],
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filemeta[b'size'] - bytesremaining))
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def _pullchangesetdiscovery(repo, remote, heads, abortwhenunrelated=True):
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"""Determine which changesets need to be pulled."""
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if heads:
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knownnode = repo.changelog.hasnode
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if all(knownnode(head) for head in heads):
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return heads, False, heads
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# TODO wire protocol version 2 is capable of more efficient discovery
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# than setdiscovery. Consider implementing something better.
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common, fetch, remoteheads = setdiscovery.findcommonheads(
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repo.ui, repo, remote, abortwhenunrelated=abortwhenunrelated)
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common = set(common)
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remoteheads = set(remoteheads)
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# If a remote head is filtered locally, put it back in the common set.
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# See the comment in exchange._pulldiscoverychangegroup() for more.
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if fetch and remoteheads:
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nodemap = repo.unfiltered().changelog.nodemap
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common |= {head for head in remoteheads if head in nodemap}
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if set(remoteheads).issubset(common):
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fetch = []
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common.discard(nullid)
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return common, fetch, remoteheads
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def _fetchchangesets(repo, tr, remote, common, fetch, remoteheads):
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# TODO consider adding a step here where we obtain the DAG shape first
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# (or ask the server to slice changesets into chunks for us) so that
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# we can perform multiple fetches in batches. This will facilitate
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# resuming interrupted clones, higher server-side cache hit rates due
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# to smaller segments, etc.
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with remote.commandexecutor() as e:
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objs = e.callcommand(b'changesetdata', {
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b'revisions': [{
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b'type': b'changesetdagrange',
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b'roots': sorted(common),
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b'heads': sorted(remoteheads),
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}],
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b'fields': {b'bookmarks', b'parents', b'phase', b'revision'},
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}).result()
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# The context manager waits on all response data when exiting. So
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# we need to remain in the context manager in order to stream data.
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return _processchangesetdata(repo, tr, objs)
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def _processchangesetdata(repo, tr, objs):
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repo.hook('prechangegroup', throw=True,
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**pycompat.strkwargs(tr.hookargs))
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urepo = repo.unfiltered()
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cl = urepo.changelog
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cl.delayupdate(tr)
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# The first emitted object is a header describing the data that
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# follows.
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meta = next(objs)
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progress = repo.ui.makeprogress(_('changesets'),
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unit=_('chunks'),
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total=meta.get(b'totalitems'))
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manifestnodes = {}
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def linkrev(node):
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repo.ui.debug('add changeset %s\n' % short(node))
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# Linkrev for changelog is always self.
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return len(cl)
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def onchangeset(cl, node):
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progress.increment()
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revision = cl.changelogrevision(node)
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# We need to preserve the mapping of changelog revision to node
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# so we can set the linkrev accordingly when manifests are added.
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manifestnodes[cl.rev(node)] = revision.manifest
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nodesbyphase = {phase: set() for phase in phases.phasenames}
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remotebookmarks = {}
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# addgroup() expects a 7-tuple describing revisions. This normalizes
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# the wire data to that format.
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#
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# This loop also aggregates non-revision metadata, such as phase
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# data.
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def iterrevisions():
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for cset in objs:
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node = cset[b'node']
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if b'phase' in cset:
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nodesbyphase[cset[b'phase']].add(node)
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for mark in cset.get(b'bookmarks', []):
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remotebookmarks[mark] = node
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# TODO add mechanism for extensions to examine records so they
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# can siphon off custom data fields.
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extrafields = {}
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for field, size in cset.get(b'fieldsfollowing', []):
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extrafields[field] = next(objs)
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# Some entries might only be metadata only updates.
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if b'revision' not in extrafields:
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continue
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data = extrafields[b'revision']
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yield (
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node,
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cset[b'parents'][0],
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cset[b'parents'][1],
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# Linknode is always itself for changesets.
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cset[b'node'],
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# We always send full revisions. So delta base is not set.
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nullid,
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mdiff.trivialdiffheader(len(data)) + data,
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# Flags not yet supported.
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0,
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)
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added = cl.addgroup(iterrevisions(), linkrev, weakref.proxy(tr),
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addrevisioncb=onchangeset)
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progress.complete()
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return {
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'added': added,
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'nodesbyphase': nodesbyphase,
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'bookmarks': remotebookmarks,
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'manifestnodes': manifestnodes,
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}
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def _fetchmanifests(repo, tr, remote, manifestnodes):
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rootmanifest = repo.manifestlog.getstorage(b'')
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# Some manifests can be shared between changesets. Filter out revisions
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# we already know about.
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fetchnodes = []
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linkrevs = {}
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seen = set()
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for clrev, node in sorted(manifestnodes.iteritems()):
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if node in seen:
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continue
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try:
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rootmanifest.rev(node)
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except error.LookupError:
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fetchnodes.append(node)
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linkrevs[node] = clrev
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seen.add(node)
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# TODO handle tree manifests
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# addgroup() expects 7-tuple describing revisions. This normalizes
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# the wire data to that format.
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def iterrevisions(objs, progress):
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for manifest in objs:
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node = manifest[b'node']
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extrafields = {}
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for field, size in manifest.get(b'fieldsfollowing', []):
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extrafields[field] = next(objs)
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if b'delta' in extrafields:
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basenode = manifest[b'deltabasenode']
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delta = extrafields[b'delta']
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elif b'revision' in extrafields:
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basenode = nullid
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revision = extrafields[b'revision']
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delta = mdiff.trivialdiffheader(len(revision)) + revision
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else:
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continue
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yield (
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node,
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manifest[b'parents'][0],
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manifest[b'parents'][1],
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# The value passed in is passed to the lookup function passed
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# to addgroup(). We already have a map of manifest node to
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# changelog revision number. So we just pass in the
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# manifest node here and use linkrevs.__getitem__ as the
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# resolution function.
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node,
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basenode,
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delta,
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# Flags not yet supported.
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0
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)
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progress.increment()
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progress = repo.ui.makeprogress(_('manifests'), unit=_('chunks'),
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total=len(fetchnodes))
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commandmeta = remote.apidescriptor[b'commands'][b'manifestdata']
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batchsize = commandmeta.get(b'recommendedbatchsize', 10000)
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# TODO make size configurable on client?
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# We send commands 1 at a time to the remote. This is not the most
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# efficient because we incur a round trip at the end of each batch.
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# However, the existing frame-based reactor keeps consuming server
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# data in the background. And this results in response data buffering
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# in memory. This can consume gigabytes of memory.
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# TODO send multiple commands in a request once background buffering
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# issues are resolved.
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added = []
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for i in pycompat.xrange(0, len(fetchnodes), batchsize):
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batch = [node for node in fetchnodes[i:i + batchsize]]
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if not batch:
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continue
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with remote.commandexecutor() as e:
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objs = e.callcommand(b'manifestdata', {
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b'tree': b'',
|
|
|
b'nodes': batch,
|
|
|
b'fields': {b'parents', b'revision'},
|
|
|
b'haveparents': True,
|
|
|
}).result()
|
|
|
|
|
|
# Chomp off header object.
|
|
|
next(objs)
|
|
|
|
|
|
added.extend(rootmanifest.addgroup(
|
|
|
iterrevisions(objs, progress),
|
|
|
linkrevs.__getitem__,
|
|
|
weakref.proxy(tr)))
|
|
|
|
|
|
progress.complete()
|
|
|
|
|
|
return {
|
|
|
'added': added,
|
|
|
'linkrevs': linkrevs,
|
|
|
}
|
|
|
|
|
|
def _derivefilesfrommanifests(repo, matcher, manifestnodes):
|
|
|
"""Determine what file nodes are relevant given a set of manifest nodes.
|
|
|
|
|
|
Returns a dict mapping file paths to dicts of file node to first manifest
|
|
|
node.
|
|
|
"""
|
|
|
ml = repo.manifestlog
|
|
|
fnodes = collections.defaultdict(dict)
|
|
|
|
|
|
progress = repo.ui.makeprogress(
|
|
|
_('scanning manifests'), total=len(manifestnodes))
|
|
|
|
|
|
with progress:
|
|
|
for manifestnode in manifestnodes:
|
|
|
m = ml.get(b'', manifestnode)
|
|
|
|
|
|
# TODO this will pull in unwanted nodes because it takes the storage
|
|
|
# delta into consideration. What we really want is something that
|
|
|
# takes the delta between the manifest's parents. And ideally we
|
|
|
# would ignore file nodes that are known locally. For now, ignore
|
|
|
# both these limitations. This will result in incremental fetches
|
|
|
# requesting data we already have. So this is far from ideal.
|
|
|
md = m.readfast()
|
|
|
|
|
|
for path, fnode in md.items():
|
|
|
if matcher(path):
|
|
|
fnodes[path].setdefault(fnode, manifestnode)
|
|
|
|
|
|
progress.increment()
|
|
|
|
|
|
return fnodes
|
|
|
|
|
|
def _fetchfiles(repo, tr, remote, fnodes, linkrevs):
|
|
|
"""Fetch file data from explicit file revisions."""
|
|
|
def iterrevisions(objs, progress):
|
|
|
for filerevision in objs:
|
|
|
node = filerevision[b'node']
|
|
|
|
|
|
extrafields = {}
|
|
|
|
|
|
for field, size in filerevision.get(b'fieldsfollowing', []):
|
|
|
extrafields[field] = next(objs)
|
|
|
|
|
|
if b'delta' in extrafields:
|
|
|
basenode = filerevision[b'deltabasenode']
|
|
|
delta = extrafields[b'delta']
|
|
|
elif b'revision' in extrafields:
|
|
|
basenode = nullid
|
|
|
revision = extrafields[b'revision']
|
|
|
delta = mdiff.trivialdiffheader(len(revision)) + revision
|
|
|
else:
|
|
|
continue
|
|
|
|
|
|
yield (
|
|
|
node,
|
|
|
filerevision[b'parents'][0],
|
|
|
filerevision[b'parents'][1],
|
|
|
node,
|
|
|
basenode,
|
|
|
delta,
|
|
|
# Flags not yet supported.
|
|
|
0,
|
|
|
)
|
|
|
|
|
|
progress.increment()
|
|
|
|
|
|
progress = repo.ui.makeprogress(
|
|
|
_('files'), unit=_('chunks'),
|
|
|
total=sum(len(v) for v in fnodes.itervalues()))
|
|
|
|
|
|
# TODO make batch size configurable
|
|
|
batchsize = 10000
|
|
|
fnodeslist = [x for x in sorted(fnodes.items())]
|
|
|
|
|
|
for i in pycompat.xrange(0, len(fnodeslist), batchsize):
|
|
|
batch = [x for x in fnodeslist[i:i + batchsize]]
|
|
|
if not batch:
|
|
|
continue
|
|
|
|
|
|
with remote.commandexecutor() as e:
|
|
|
fs = []
|
|
|
locallinkrevs = {}
|
|
|
|
|
|
for path, nodes in batch:
|
|
|
fs.append((path, e.callcommand(b'filedata', {
|
|
|
b'path': path,
|
|
|
b'nodes': sorted(nodes),
|
|
|
b'fields': {b'parents', b'revision'},
|
|
|
b'haveparents': True,
|
|
|
})))
|
|
|
|
|
|
locallinkrevs[path] = {
|
|
|
node: linkrevs[manifestnode]
|
|
|
for node, manifestnode in nodes.iteritems()}
|
|
|
|
|
|
for path, f in fs:
|
|
|
objs = f.result()
|
|
|
|
|
|
# Chomp off header objects.
|
|
|
next(objs)
|
|
|
|
|
|
store = repo.file(path)
|
|
|
store.addgroup(
|
|
|
iterrevisions(objs, progress),
|
|
|
locallinkrevs[path].__getitem__,
|
|
|
weakref.proxy(tr))
|
|
|
|
|
|
def _fetchfilesfromcsets(repo, tr, remote, pathfilter, fnodes, csets,
|
|
|
manlinkrevs, shallow=False):
|
|
|
"""Fetch file data from explicit changeset revisions."""
|
|
|
|
|
|
def iterrevisions(objs, remaining, progress):
|
|
|
while remaining:
|
|
|
filerevision = next(objs)
|
|
|
|
|
|
node = filerevision[b'node']
|
|
|
|
|
|
extrafields = {}
|
|
|
|
|
|
for field, size in filerevision.get(b'fieldsfollowing', []):
|
|
|
extrafields[field] = next(objs)
|
|
|
|
|
|
if b'delta' in extrafields:
|
|
|
basenode = filerevision[b'deltabasenode']
|
|
|
delta = extrafields[b'delta']
|
|
|
elif b'revision' in extrafields:
|
|
|
basenode = nullid
|
|
|
revision = extrafields[b'revision']
|
|
|
delta = mdiff.trivialdiffheader(len(revision)) + revision
|
|
|
else:
|
|
|
continue
|
|
|
|
|
|
if b'linknode' in filerevision:
|
|
|
linknode = filerevision[b'linknode']
|
|
|
else:
|
|
|
linknode = node
|
|
|
|
|
|
yield (
|
|
|
node,
|
|
|
filerevision[b'parents'][0],
|
|
|
filerevision[b'parents'][1],
|
|
|
linknode,
|
|
|
basenode,
|
|
|
delta,
|
|
|
# Flags not yet supported.
|
|
|
0,
|
|
|
)
|
|
|
|
|
|
progress.increment()
|
|
|
remaining -= 1
|
|
|
|
|
|
progress = repo.ui.makeprogress(
|
|
|
_('files'), unit=_('chunks'),
|
|
|
total=sum(len(v) for v in fnodes.itervalues()))
|
|
|
|
|
|
commandmeta = remote.apidescriptor[b'commands'][b'filesdata']
|
|
|
batchsize = commandmeta.get(b'recommendedbatchsize', 50000)
|
|
|
|
|
|
shallowfiles = repository.REPO_FEATURE_SHALLOW_FILE_STORAGE in repo.features
|
|
|
fields = {b'parents', b'revision'}
|
|
|
clrev = repo.changelog.rev
|
|
|
|
|
|
# There are no guarantees that we'll have ancestor revisions if
|
|
|
# a) this repo has shallow file storage b) shallow data fetching is enabled.
|
|
|
# Force remote to not delta against possibly unknown revisions when these
|
|
|
# conditions hold.
|
|
|
haveparents = not (shallowfiles or shallow)
|
|
|
|
|
|
# Similarly, we may not have calculated linkrevs for all incoming file
|
|
|
# revisions. Ask the remote to do work for us in this case.
|
|
|
if not haveparents:
|
|
|
fields.add(b'linknode')
|
|
|
|
|
|
for i in pycompat.xrange(0, len(csets), batchsize):
|
|
|
batch = [x for x in csets[i:i + batchsize]]
|
|
|
if not batch:
|
|
|
continue
|
|
|
|
|
|
with remote.commandexecutor() as e:
|
|
|
args = {
|
|
|
b'revisions': [{
|
|
|
b'type': b'changesetexplicit',
|
|
|
b'nodes': batch,
|
|
|
}],
|
|
|
b'fields': fields,
|
|
|
b'haveparents': haveparents,
|
|
|
}
|
|
|
|
|
|
if pathfilter:
|
|
|
args[b'pathfilter'] = pathfilter
|
|
|
|
|
|
objs = e.callcommand(b'filesdata', args).result()
|
|
|
|
|
|
# First object is an overall header.
|
|
|
overall = next(objs)
|
|
|
|
|
|
# We have overall['totalpaths'] segments.
|
|
|
for i in pycompat.xrange(overall[b'totalpaths']):
|
|
|
header = next(objs)
|
|
|
|
|
|
path = header[b'path']
|
|
|
store = repo.file(path)
|
|
|
|
|
|
linkrevs = {
|
|
|
fnode: manlinkrevs[mnode]
|
|
|
for fnode, mnode in fnodes[path].iteritems()}
|
|
|
|
|
|
def getlinkrev(node):
|
|
|
if node in linkrevs:
|
|
|
return linkrevs[node]
|
|
|
else:
|
|
|
return clrev(node)
|
|
|
|
|
|
store.addgroup(iterrevisions(objs, header[b'totalitems'],
|
|
|
progress),
|
|
|
getlinkrev,
|
|
|
weakref.proxy(tr),
|
|
|
maybemissingparents=shallow)
|
|
|
|
