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# nodemap.py - nodemap related code and utilities
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#
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# Copyright 2019 Pierre-Yves David <pierre-yves.david@octobus.net>
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# Copyright 2019 George Racinet <georges.racinet@octobus.net>
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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 annotations
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import re
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import struct
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from ..node import hex
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from .. import (
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error,
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requirements,
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util,
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)
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from . import docket as docket_mod
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class NodeMap(dict):
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def __missing__(self, x):
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raise error.RevlogError(b'unknown node: %s' % x)
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def test_race_hook_1():
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"""hook point for test
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This let tests to have things happens between the docket reading and the
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data reading"""
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pass
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def post_stream_cleanup(repo):
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"""The stream clone might needs to remove some file if persisten nodemap
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was dropped while stream cloning
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"""
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if requirements.REVLOGV1_REQUIREMENT not in repo.requirements:
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return
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if requirements.NODEMAP_REQUIREMENT in repo.requirements:
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return
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unfi = repo.unfiltered()
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delete_nodemap(None, unfi, unfi.changelog)
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delete_nodemap(None, repo, unfi.manifestlog._rootstore._revlog)
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def persisted_data(revlog):
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"""read the nodemap for a revlog from disk"""
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if revlog._nodemap_file is None:
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return None
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pdata = revlog.opener.tryread(revlog._nodemap_file)
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if not pdata:
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return None
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offset = 0
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(version,) = S_VERSION.unpack(pdata[offset : offset + S_VERSION.size])
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if version != ONDISK_VERSION:
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return None
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offset += S_VERSION.size
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headers = S_HEADER.unpack(pdata[offset : offset + S_HEADER.size])
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uid_size, tip_rev, data_length, data_unused, tip_node_size = headers
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offset += S_HEADER.size
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docket = NodeMapDocket(pdata[offset : offset + uid_size])
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offset += uid_size
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docket.tip_rev = tip_rev
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docket.tip_node = pdata[offset : offset + tip_node_size]
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docket.data_length = data_length
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docket.data_unused = data_unused
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filename = _rawdata_filepath(revlog, docket)
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use_mmap = revlog.opener.options.get(b"persistent-nodemap.mmap")
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test_race_hook_1()
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try:
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with revlog.opener(filename) as fd:
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if use_mmap and revlog.opener.is_mmap_safe(filename):
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try:
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data = util.buffer(util.mmapread(fd, data_length))
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except ValueError:
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# raised when the read file is too small
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data = b''
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else:
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data = fd.read(data_length)
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except FileNotFoundError:
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return None
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if len(data) < data_length:
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return None
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return docket, data
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def setup_persistent_nodemap(tr, revlog):
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"""Install whatever is needed transaction side to persist a nodemap on disk
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(only actually persist the nodemap if this is relevant for this revlog)
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"""
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if revlog._inline:
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return # inlined revlog are too small for this to be relevant
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if revlog._nodemap_file is None:
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return # we do not use persistent_nodemap on this revlog
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# we need to happen after the changelog finalization, in that use "cl-"
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callback_id = b"nm-revlog-persistent-nodemap-%s" % revlog._nodemap_file
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if tr.hasfinalize(callback_id):
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return # no need to register again
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tr.addpending(
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callback_id, lambda tr: persist_nodemap(tr, revlog, pending=True)
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)
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tr.addfinalize(callback_id, lambda tr: persist_nodemap(tr, revlog))
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class _NoTransaction:
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"""transaction like object to update the nodemap outside a transaction"""
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def __init__(self):
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self._postclose = {}
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def addpostclose(self, callback_id, callback_func):
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self._postclose[callback_id] = callback_func
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def registertmp(self, *args, **kwargs):
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pass
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def addbackup(self, *args, **kwargs):
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pass
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def add(self, *args, **kwargs):
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pass
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def addabort(self, *args, **kwargs):
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pass
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def _report(self, *args):
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pass
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def update_persistent_nodemap(revlog):
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"""update the persistent nodemap right now
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To be used for updating the nodemap on disk outside of a normal transaction
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setup (eg, `debugupdatecache`).
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"""
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if revlog._inline:
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return # inlined revlog are too small for this to be relevant
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if revlog._nodemap_file is None:
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return # we do not use persistent_nodemap on this revlog
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notr = _NoTransaction()
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persist_nodemap(notr, revlog)
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for k in sorted(notr._postclose):
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notr._postclose[k](None)
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def delete_nodemap(tr, repo, revlog):
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"""Delete nodemap data on disk for a given revlog"""
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prefix = revlog.radix
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pattern = re.compile(br"(^|/)%s(-[0-9a-f]+\.nd|\.n(\.a)?)$" % prefix)
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dirpath = revlog.opener.dirname(revlog._indexfile)
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for f in revlog.opener.listdir(dirpath):
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if pattern.match(f):
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repo.svfs.tryunlink(f)
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def persist_nodemap(tr, revlog, pending=False, force=False):
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"""Write nodemap data on disk for a given revlog"""
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if len(revlog.index) <= 0:
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return
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if getattr(revlog, 'filteredrevs', ()):
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raise error.ProgrammingError(
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"cannot persist nodemap of a filtered changelog"
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)
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if revlog._nodemap_file is None:
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if force:
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revlog._nodemap_file = get_nodemap_file(revlog)
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else:
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msg = "calling persist nodemap on a revlog without the feature enabled"
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raise error.ProgrammingError(msg)
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can_incremental = hasattr(revlog.index, "nodemap_data_incremental")
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ondisk_docket = revlog._nodemap_docket
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feed_data = hasattr(revlog.index, "update_nodemap_data")
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use_mmap = revlog.opener.options.get(b"persistent-nodemap.mmap")
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data = None
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# first attemp an incremental update of the data
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if can_incremental and ondisk_docket is not None:
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target_docket = revlog._nodemap_docket.copy()
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(
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src_docket,
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data_changed_count,
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data,
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) = revlog.index.nodemap_data_incremental()
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new_length = target_docket.data_length + len(data)
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new_unused = target_docket.data_unused + data_changed_count
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if src_docket != target_docket:
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data = None
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elif new_length <= (new_unused * 10): # under 10% of unused data
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data = None
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else:
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datafile = _rawdata_filepath(revlog, target_docket)
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# EXP-TODO: if this is a cache, this should use a cache vfs, not a
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# store vfs
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tr.add(datafile, target_docket.data_length)
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with revlog.opener(datafile, b'r+') as fd:
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fd.seek(target_docket.data_length)
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fd.write(data)
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if feed_data:
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if use_mmap and revlog.opener.is_mmap_safe(datafile):
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fd.flush()
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new_data = util.buffer(util.mmapread(fd, new_length))
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else:
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fd.seek(0)
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new_data = fd.read(new_length)
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target_docket.data_length = new_length
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target_docket.data_unused = new_unused
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if data is None:
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# otherwise fallback to a full new export
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target_docket = NodeMapDocket()
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datafile = _rawdata_filepath(revlog, target_docket)
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if hasattr(revlog.index, "nodemap_data_all"):
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data = revlog.index.nodemap_data_all()
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else:
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data = persistent_data(revlog.index)
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# EXP-TODO: if this is a cache, this should use a cache vfs, not a
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# store vfs
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tryunlink = revlog.opener.tryunlink
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def abortck(tr):
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tryunlink(datafile)
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callback_id = b"delete-%s" % datafile
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# some flavor of the transaction abort does not cleanup new file, it
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# simply empty them.
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tr.addabort(callback_id, abortck)
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with revlog.opener(datafile, b'w+') as fd:
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fd.write(data)
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if feed_data:
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if use_mmap and revlog.opener.is_mmap_safe(datafile):
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fd.flush()
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new_data = util.buffer(util.mmapread(fd, len(data)))
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else:
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new_data = data
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target_docket.data_length = len(data)
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target_docket.tip_rev = revlog.tiprev()
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target_docket.tip_node = revlog.node(target_docket.tip_rev)
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# EXP-TODO: if this is a cache, this should use a cache vfs, not a
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# store vfs
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file_path = revlog._nodemap_file
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if pending:
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file_path += b'.a'
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tr.registertmp(file_path)
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else:
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tr.addbackup(file_path)
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with revlog.opener(file_path, b'w', atomictemp=True) as fp:
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fp.write(target_docket.serialize())
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revlog._nodemap_docket = target_docket
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if feed_data:
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revlog.index.update_nodemap_data(target_docket, new_data)
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# search for old index file in all cases, some older process might have
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# left one behind.
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olds = _other_rawdata_filepath(revlog, target_docket)
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if olds:
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realvfs = getattr(revlog, '_realopener', revlog.opener)
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def cleanup(tr):
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for oldfile in olds:
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realvfs.tryunlink(oldfile)
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callback_id = b"revlog-cleanup-nodemap-%s" % revlog._nodemap_file
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tr.addpostclose(callback_id, cleanup)
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### Nodemap docket file
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#
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# The nodemap data are stored on disk using 2 files:
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#
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# * a raw data files containing a persistent nodemap
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# (see `Nodemap Trie` section)
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#
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# * a small "docket" file containing medatadata
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#
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# While the nodemap data can be multiple tens of megabytes, the "docket" is
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# small, it is easy to update it automatically or to duplicated its content
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# during a transaction.
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#
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# Multiple raw data can exist at the same time (The currently valid one and a
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# new one beind used by an in progress transaction). To accomodate this, the
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# filename hosting the raw data has a variable parts. The exact filename is
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# specified inside the "docket" file.
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#
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# The docket file contains information to find, qualify and validate the raw
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# data. Its content is currently very light, but it will expand as the on disk
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# nodemap gains the necessary features to be used in production.
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ONDISK_VERSION = 1
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S_VERSION = struct.Struct(">B")
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S_HEADER = struct.Struct(">BQQQQ")
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class NodeMapDocket:
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"""metadata associated with persistent nodemap data
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The persistent data may come from disk or be on their way to disk.
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"""
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def __init__(self, uid=None):
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if uid is None:
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uid = docket_mod.make_uid()
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# a unique identifier for the data file:
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# - When new data are appended, it is preserved.
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# - When a new data file is created, a new identifier is generated.
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self.uid = uid
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# the tipmost revision stored in the data file. This revision and all
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# revision before it are expected to be encoded in the data file.
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self.tip_rev = None
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# the node of that tipmost revision, if it mismatch the current index
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# data the docket is not valid for the current index and should be
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# discarded.
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#
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# note: this method is not perfect as some destructive operation could
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# preserve the same tip_rev + tip_node while altering lower revision.
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# However this multiple other caches have the same vulnerability (eg:
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# brancmap cache).
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self.tip_node = None
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# the size (in bytes) of the persisted data to encode the nodemap valid
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# for `tip_rev`.
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# - data file shorter than this are corrupted,
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# - any extra data should be ignored.
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self.data_length = None
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# the amount (in bytes) of "dead" data, still in the data file but no
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# longer used for the nodemap.
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self.data_unused = 0
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def copy(self):
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new = NodeMapDocket(uid=self.uid)
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new.tip_rev = self.tip_rev
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new.tip_node = self.tip_node
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new.data_length = self.data_length
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new.data_unused = self.data_unused
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return new
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def __cmp__(self, other):
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if self.uid < other.uid:
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return -1
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if self.uid > other.uid:
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return 1
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elif self.data_length < other.data_length:
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return -1
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elif self.data_length > other.data_length:
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return 1
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return 0
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def __eq__(self, other):
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return self.uid == other.uid and self.data_length == other.data_length
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def serialize(self):
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"""return serialized bytes for a docket using the passed uid"""
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data = []
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data.append(S_VERSION.pack(ONDISK_VERSION))
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headers = (
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len(self.uid),
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self.tip_rev,
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self.data_length,
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self.data_unused,
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len(self.tip_node),
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)
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data.append(S_HEADER.pack(*headers))
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data.append(self.uid)
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data.append(self.tip_node)
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return b''.join(data)
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def _rawdata_filepath(revlog, docket):
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"""The (vfs relative) nodemap's rawdata file for a given uid"""
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prefix = revlog.radix
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return b"%s-%s.nd" % (prefix, docket.uid)
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def _other_rawdata_filepath(revlog, docket):
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prefix = revlog.radix
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pattern = re.compile(br"(^|/)%s-[0-9a-f]+\.nd$" % prefix)
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new_file_path = _rawdata_filepath(revlog, docket)
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new_file_name = revlog.opener.basename(new_file_path)
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dirpath = revlog.opener.dirname(new_file_path)
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others = []
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for f in revlog.opener.listdir(dirpath):
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if pattern.match(f) and f != new_file_name:
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others.append(f)
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return others
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### Nodemap Trie
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#
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# This is a simple reference implementation to compute and persist a nodemap
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# trie. This reference implementation is write only. The python version of this
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# is not expected to be actually used, since it wont provide performance
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# improvement over existing non-persistent C implementation.
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#
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# The nodemap is persisted as Trie using 4bits-address/16-entries block. each
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# revision can be adressed using its node shortest prefix.
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#
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# The trie is stored as a sequence of block. Each block contains 16 entries
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# (signed 64bit integer, big endian). Each entry can be one of the following:
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#
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# * value >= 0 -> index of sub-block
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# * value == -1 -> no value
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# * value < -1 -> encoded revision: rev = -(value+2)
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#
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# See REV_OFFSET and _transform_rev below.
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#
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# The implementation focus on simplicity, not on performance. A Rust
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# implementation should provide a efficient version of the same binary
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# persistence. This reference python implementation is never meant to be
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# extensively use in production.
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def persistent_data(index):
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"""return the persistent binary form for a nodemap for a given index"""
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trie = _build_trie(index)
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return _persist_trie(trie)
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def update_persistent_data(index, root, max_idx, last_rev):
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"""return the incremental update for persistent nodemap from a given index"""
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changed_block, trie = _update_trie(index, root, last_rev)
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return (
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changed_block * S_BLOCK.size,
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_persist_trie(trie, existing_idx=max_idx),
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)
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S_BLOCK = struct.Struct(">" + ("l" * 16))
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NO_ENTRY = -1
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# rev 0 need to be -2 because 0 is used by block, -1 is a special value.
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REV_OFFSET = 2
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def _transform_rev(rev):
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"""Return the number used to represent the rev in the tree.
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(or retrieve a rev number from such representation)
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Note that this is an involution, a function equal to its inverse (i.e.
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which gives the identity when applied to itself).
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"""
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return -(rev + REV_OFFSET)
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def _to_int(hex_digit):
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"""turn an hexadecimal digit into a proper integer"""
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return int(hex_digit, 16)
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class Block(dict):
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"""represent a block of the Trie
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contains up to 16 entry indexed from 0 to 15"""
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def __init__(self):
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super(Block, self).__init__()
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# If this block exist on disk, here is its ID
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self.ondisk_id = None
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def __iter__(self):
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return iter(self.get(i) for i in range(16))
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def _build_trie(index):
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"""build a nodemap trie
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The nodemap stores revision number for each unique prefix.
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Each block is a dictionary with keys in `[0, 15]`. Values are either
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another block or a revision number.
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"""
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root = Block()
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for rev in range(len(index)):
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current_hex = hex(index[rev][7])
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_insert_into_block(index, 0, root, rev, current_hex)
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return root
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def _update_trie(index, root, last_rev):
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"""consume"""
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changed = 0
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for rev in range(last_rev + 1, len(index)):
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current_hex = hex(index[rev][7])
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changed += _insert_into_block(index, 0, root, rev, current_hex)
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return changed, root
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def _insert_into_block(index, level, block, current_rev, current_hex):
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"""insert a new revision in a block
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index: the index we are adding revision for
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level: the depth of the current block in the trie
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block: the block currently being considered
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current_rev: the revision number we are adding
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current_hex: the hexadecimal representation of the of that revision
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"""
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changed = 1
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if block.ondisk_id is not None:
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block.ondisk_id = None
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hex_digit = _to_int(current_hex[level : level + 1])
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entry = block.get(hex_digit)
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if entry is None:
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# no entry, simply store the revision number
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block[hex_digit] = current_rev
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elif isinstance(entry, dict):
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# need to recurse to an underlying block
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changed += _insert_into_block(
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index, level + 1, entry, current_rev, current_hex
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)
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else:
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# collision with a previously unique prefix, inserting new
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# vertices to fit both entry.
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other_hex = hex(index[entry][7])
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other_rev = entry
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new = Block()
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block[hex_digit] = new
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_insert_into_block(index, level + 1, new, other_rev, other_hex)
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_insert_into_block(index, level + 1, new, current_rev, current_hex)
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return changed
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def _persist_trie(root, existing_idx=None):
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"""turn a nodemap trie into persistent binary data
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See `_build_trie` for nodemap trie structure"""
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block_map = {}
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if existing_idx is not None:
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base_idx = existing_idx + 1
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else:
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base_idx = 0
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chunks = []
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for tn in _walk_trie(root):
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if tn.ondisk_id is not None:
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block_map[id(tn)] = tn.ondisk_id
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else:
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block_map[id(tn)] = len(chunks) + base_idx
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chunks.append(_persist_block(tn, block_map))
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return b''.join(chunks)
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def _walk_trie(block):
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"""yield all the block in a trie
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Children blocks are always yield before their parent block.
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"""
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for __, item in sorted(block.items()):
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if isinstance(item, dict):
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for sub_block in _walk_trie(item):
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yield sub_block
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yield block
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def _persist_block(block_node, block_map):
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"""produce persistent binary data for a single block
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Children block are assumed to be already persisted and present in
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block_map.
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"""
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data = tuple(_to_value(v, block_map) for v in block_node)
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return S_BLOCK.pack(*data)
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def _to_value(item, block_map):
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"""persist any value as an integer"""
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if item is None:
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return NO_ENTRY
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elif isinstance(item, dict):
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return block_map[id(item)]
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else:
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return _transform_rev(item)
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def parse_data(data):
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"""parse parse nodemap data into a nodemap Trie"""
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if (len(data) % S_BLOCK.size) != 0:
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msg = b"nodemap data size is not a multiple of block size (%d): %d"
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raise error.Abort(msg % (S_BLOCK.size, len(data)))
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if not data:
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return Block(), None
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block_map = {}
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new_blocks = []
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for i in range(0, len(data), S_BLOCK.size):
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block = Block()
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block.ondisk_id = len(block_map)
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block_map[block.ondisk_id] = block
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block_data = data[i : i + S_BLOCK.size]
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values = S_BLOCK.unpack(block_data)
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new_blocks.append((block, values))
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for b, values in new_blocks:
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for idx, v in enumerate(values):
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if v == NO_ENTRY:
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continue
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elif v >= 0:
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b[idx] = block_map[v]
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else:
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b[idx] = _transform_rev(v)
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return block, i // S_BLOCK.size
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# debug utility
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def check_data(ui, index, data):
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"""verify that the provided nodemap data are valid for the given idex"""
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ret = 0
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ui.status((b"revisions in index: %d\n") % len(index))
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root, __ = parse_data(data)
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all_revs = set(_all_revisions(root))
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ui.status((b"revisions in nodemap: %d\n") % len(all_revs))
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for r in range(len(index)):
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if r not in all_revs:
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msg = b" revision missing from nodemap: %d\n" % r
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ui.write_err(msg)
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ret = 1
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else:
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all_revs.remove(r)
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nm_rev = _find_node(root, hex(index[r][7]))
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if nm_rev is None:
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msg = b" revision node does not match any entries: %d\n" % r
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ui.write_err(msg)
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ret = 1
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elif nm_rev != r:
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msg = (
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b" revision node does not match the expected revision: "
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b"%d != %d\n" % (r, nm_rev)
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)
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ui.write_err(msg)
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ret = 1
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if all_revs:
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for r in sorted(all_revs):
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msg = b" extra revisions in nodemap: %d\n" % r
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ui.write_err(msg)
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ret = 1
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return ret
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def _all_revisions(root):
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"""return all revisions stored in a Trie"""
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for block in _walk_trie(root):
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for v in block:
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if v is None or isinstance(v, Block):
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continue
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yield v
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def _find_node(block, node):
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"""find the revision associated with a given node"""
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entry = block.get(_to_int(node[0:1]))
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if isinstance(entry, dict):
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return _find_node(entry, node[1:])
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return entry
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def get_nodemap_file(revlog):
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if revlog._trypending:
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pending_path = revlog.radix + b".n.a"
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if revlog.opener.exists(pending_path):
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return pending_path
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return revlog.radix + b".n"
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