Mercurial > hg
view tests/simplestorerepo.py @ 41157:c4639fdae1b9
simplestorerepo: minimal changes required to get this mostly working again
I was going to change this code's use of CBOR to use our in-house CBOR code,
but discovered it's been broken for a while. This messy change gets it back to
a point where it mostly works, I think roughly as well as it ever did.
Should we keep this and fix it up the rest of the way, or dump it in favor of
the sqlite store? Would this be a good jumping-off point for some sort of
union store that could facilitate a cleanup in remotefilelog?
Differential Revision: https://phab.mercurial-scm.org/D5519
author | Augie Fackler <augie@google.com> |
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date | Mon, 07 Jan 2019 18:22:20 -0500 |
parents | 1b183edbb68e |
children | ad51e6117095 |
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# simplestorerepo.py - Extension that swaps in alternate repository storage. # # Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. # To use this with the test suite: # # $ HGREPOFEATURES="simplestore" ./run-tests.py \ # --extra-config-opt extensions.simplestore=`pwd`/simplestorerepo.py from __future__ import absolute_import import stat from mercurial.i18n import _ from mercurial.node import ( bin, hex, nullid, nullrev, ) from mercurial.thirdparty import ( attr, cbor, ) from mercurial import ( ancestor, bundlerepo, error, extensions, localrepo, mdiff, pycompat, repository, revlog, store, verify, ) from mercurial.utils import ( interfaceutil, storageutil, ) # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should # be specifying the version(s) of Mercurial they are tested with, or # leave the attribute unspecified. testedwith = 'ships-with-hg-core' REQUIREMENT = 'testonly-simplestore' def validatenode(node): if isinstance(node, int): raise ValueError('expected node; got int') if len(node) != 20: raise ValueError('expected 20 byte node') def validaterev(rev): if not isinstance(rev, int): raise ValueError('expected int') class simplestoreerror(error.StorageError): pass @interfaceutil.implementer(repository.irevisiondelta) @attr.s(slots=True) class simplestorerevisiondelta(object): node = attr.ib() p1node = attr.ib() p2node = attr.ib() basenode = attr.ib() flags = attr.ib() baserevisionsize = attr.ib() revision = attr.ib() delta = attr.ib() linknode = attr.ib(default=None) @interfaceutil.implementer(repository.iverifyproblem) @attr.s(frozen=True) class simplefilestoreproblem(object): warning = attr.ib(default=None) error = attr.ib(default=None) node = attr.ib(default=None) @interfaceutil.implementer(repository.ifilestorage) class filestorage(object): """Implements storage for a tracked path. Data is stored in the VFS in a directory corresponding to the tracked path. Index data is stored in an ``index`` file using CBOR. Fulltext data is stored in files having names of the node. """ def __init__(self, svfs, path): self._svfs = svfs self._path = path self._storepath = b'/'.join([b'data', path]) self._indexpath = b'/'.join([self._storepath, b'index']) indexdata = self._svfs.tryread(self._indexpath) if indexdata: indexdata = cbor.loads(indexdata) self._indexdata = indexdata or [] self._indexbynode = {} self._indexbyrev = {} self._index = [] self._refreshindex() def _refreshindex(self): self._indexbynode.clear() self._indexbyrev.clear() self._index = [] for i, entry in enumerate(self._indexdata): self._indexbynode[entry[b'node']] = entry self._indexbyrev[i] = entry self._indexbynode[nullid] = { b'node': nullid, b'p1': nullid, b'p2': nullid, b'linkrev': nullrev, b'flags': 0, } self._indexbyrev[nullrev] = { b'node': nullid, b'p1': nullid, b'p2': nullid, b'linkrev': nullrev, b'flags': 0, } for i, entry in enumerate(self._indexdata): p1rev, p2rev = self.parentrevs(self.rev(entry[b'node'])) # start, length, rawsize, chainbase, linkrev, p1, p2, node self._index.append((0, 0, 0, -1, entry[b'linkrev'], p1rev, p2rev, entry[b'node'])) self._index.append((0, 0, 0, -1, -1, -1, -1, nullid)) def __len__(self): return len(self._indexdata) def __iter__(self): return iter(range(len(self))) def revs(self, start=0, stop=None): step = 1 if stop is not None: if start > stop: step = -1 stop += step else: stop = len(self) return range(start, stop, step) def parents(self, node): validatenode(node) if node not in self._indexbynode: raise KeyError('unknown node') entry = self._indexbynode[node] return entry[b'p1'], entry[b'p2'] def parentrevs(self, rev): p1, p2 = self.parents(self._indexbyrev[rev][b'node']) return self.rev(p1), self.rev(p2) def rev(self, node): validatenode(node) try: self._indexbynode[node] except KeyError: raise error.LookupError(node, self._indexpath, _('no node')) for rev, entry in self._indexbyrev.items(): if entry[b'node'] == node: return rev raise error.ProgrammingError('this should not occur') def node(self, rev): validaterev(rev) return self._indexbyrev[rev][b'node'] def hasnode(self, node): validatenode(node) return node in self._indexbynode def censorrevision(self, tr, censornode, tombstone=b''): raise NotImplementedError('TODO') def lookup(self, node): if isinstance(node, int): return self.node(node) if len(node) == 20: self.rev(node) return node try: rev = int(node) if '%d' % rev != node: raise ValueError if rev < 0: rev = len(self) + rev if rev < 0 or rev >= len(self): raise ValueError return self.node(rev) except (ValueError, OverflowError): pass if len(node) == 40: try: rawnode = bin(node) self.rev(rawnode) return rawnode except TypeError: pass raise error.LookupError(node, self._path, _('invalid lookup input')) def linkrev(self, rev): validaterev(rev) return self._indexbyrev[rev][b'linkrev'] def _flags(self, rev): validaterev(rev) return self._indexbyrev[rev][b'flags'] def _candelta(self, baserev, rev): validaterev(baserev) validaterev(rev) if ((self._flags(baserev) & revlog.REVIDX_RAWTEXT_CHANGING_FLAGS) or (self._flags(rev) & revlog.REVIDX_RAWTEXT_CHANGING_FLAGS)): return False return True def _processflags(self, text, flags, operation, raw=False): if flags == 0: return text, True if flags & ~revlog.REVIDX_KNOWN_FLAGS: raise simplestoreerror(_("incompatible revision flag '%#x'") % (flags & ~revlog.REVIDX_KNOWN_FLAGS)) validatehash = True # Depending on the operation (read or write), the order might be # reversed due to non-commutative transforms. orderedflags = revlog.REVIDX_FLAGS_ORDER if operation == 'write': orderedflags = reversed(orderedflags) for flag in orderedflags: # If a flagprocessor has been registered for a known flag, apply the # related operation transform and update result tuple. if flag & flags: vhash = True if flag not in revlog._flagprocessors: message = _("missing processor for flag '%#x'") % (flag) raise simplestoreerror(message) processor = revlog._flagprocessors[flag] if processor is not None: readtransform, writetransform, rawtransform = processor if raw: vhash = rawtransform(self, text) elif operation == 'read': text, vhash = readtransform(self, text) else: # write operation text, vhash = writetransform(self, text) validatehash = validatehash and vhash return text, validatehash def checkhash(self, text, node, p1=None, p2=None, rev=None): if p1 is None and p2 is None: p1, p2 = self.parents(node) if node != storageutil.hashrevisionsha1(text, p1, p2): raise simplestoreerror(_("integrity check failed on %s") % self._path) def revision(self, nodeorrev, raw=False): if isinstance(nodeorrev, int): node = self.node(nodeorrev) else: node = nodeorrev validatenode(node) if node == nullid: return b'' rev = self.rev(node) flags = self._flags(rev) path = b'/'.join([self._storepath, hex(node)]) rawtext = self._svfs.read(path) text, validatehash = self._processflags(rawtext, flags, 'read', raw=raw) if validatehash: self.checkhash(text, node, rev=rev) return text def read(self, node): validatenode(node) revision = self.revision(node) if not revision.startswith(b'\1\n'): return revision start = revision.index(b'\1\n', 2) return revision[start + 2:] def renamed(self, node): validatenode(node) if self.parents(node)[0] != nullid: return False fulltext = self.revision(node) m = storageutil.parsemeta(fulltext)[0] if m and 'copy' in m: return m['copy'], bin(m['copyrev']) return False def cmp(self, node, text): validatenode(node) t = text if text.startswith(b'\1\n'): t = b'\1\n\1\n' + text p1, p2 = self.parents(node) if storageutil.hashrevisionsha1(t, p1, p2) == node: return False if self.iscensored(self.rev(node)): return text != b'' if self.renamed(node): t2 = self.read(node) return t2 != text return True def size(self, rev): validaterev(rev) node = self._indexbyrev[rev][b'node'] if self.renamed(node): return len(self.read(node)) if self.iscensored(rev): return 0 return len(self.revision(node)) def iscensored(self, rev): validaterev(rev) return self._flags(rev) & repository.REVISION_FLAG_CENSORED def commonancestorsheads(self, a, b): validatenode(a) validatenode(b) a = self.rev(a) b = self.rev(b) ancestors = ancestor.commonancestorsheads(self.parentrevs, a, b) return pycompat.maplist(self.node, ancestors) def descendants(self, revs): # This is a copy of revlog.descendants() first = min(revs) if first == nullrev: for i in self: yield i return seen = set(revs) for i in self.revs(start=first + 1): for x in self.parentrevs(i): if x != nullrev and x in seen: seen.add(i) yield i break # Required by verify. def files(self): entries = self._svfs.listdir(self._storepath) # Strip out undo.backup.* files created as part of transaction # recording. entries = [f for f in entries if not f.startswith('undo.backup.')] return [b'/'.join((self._storepath, f)) for f in entries] def storageinfo(self, exclusivefiles=False, sharedfiles=False, revisionscount=False, trackedsize=False, storedsize=False): # TODO do a real implementation of this return { 'exclusivefiles': [], 'sharedfiles': [], 'revisionscount': len(self), 'trackedsize': 0, 'storedsize': None, } def verifyintegrity(self, state): state['skipread'] = set() for rev in self: node = self.node(rev) try: self.revision(node) except Exception as e: yield simplefilestoreproblem( error='unpacking %s: %s' % (node, e), node=node) state['skipread'].add(node) def emitrevisions(self, nodes, nodesorder=None, revisiondata=False, assumehaveparentrevisions=False, deltamode=repository.CG_DELTAMODE_STD): # TODO this will probably break on some ordering options. nodes = [n for n in nodes if n != nullid] if not nodes: return for delta in storageutil.emitrevisions( self, nodes, nodesorder, simplestorerevisiondelta, revisiondata=revisiondata, assumehaveparentrevisions=assumehaveparentrevisions, deltamode=deltamode): yield delta def add(self, text, meta, transaction, linkrev, p1, p2): if meta or text.startswith(b'\1\n'): text = storageutil.packmeta(meta, text) return self.addrevision(text, transaction, linkrev, p1, p2) def addrevision(self, text, transaction, linkrev, p1, p2, node=None, flags=revlog.REVIDX_DEFAULT_FLAGS, cachedelta=None): validatenode(p1) validatenode(p2) if flags: node = node or storageutil.hashrevisionsha1(text, p1, p2) rawtext, validatehash = self._processflags(text, flags, 'write') node = node or storageutil.hashrevisionsha1(text, p1, p2) if node in self._indexbynode: return node if validatehash: self.checkhash(rawtext, node, p1=p1, p2=p2) return self._addrawrevision(node, rawtext, transaction, linkrev, p1, p2, flags) def _addrawrevision(self, node, rawtext, transaction, link, p1, p2, flags): transaction.addbackup(self._indexpath) path = b'/'.join([self._storepath, hex(node)]) self._svfs.write(path, rawtext) self._indexdata.append({ b'node': node, b'p1': p1, b'p2': p2, b'linkrev': link, b'flags': flags, }) self._reflectindexupdate() return node def _reflectindexupdate(self): self._refreshindex() self._svfs.write(self._indexpath, cbor.dumps(self._indexdata)) def addgroup(self, deltas, linkmapper, transaction, addrevisioncb=None, maybemissingparents=False): if maybemissingparents: raise error.Abort(_('simple store does not support missing parents ' 'write mode')) nodes = [] transaction.addbackup(self._indexpath) for node, p1, p2, linknode, deltabase, delta, flags in deltas: linkrev = linkmapper(linknode) flags = flags or revlog.REVIDX_DEFAULT_FLAGS nodes.append(node) if node in self._indexbynode: continue # Need to resolve the fulltext from the delta base. if deltabase == nullid: text = mdiff.patch(b'', delta) else: text = mdiff.patch(self.revision(deltabase), delta) self._addrawrevision(node, text, transaction, linkrev, p1, p2, flags) if addrevisioncb: addrevisioncb(self, node) return nodes def _headrevs(self): # Assume all revisions are heads by default. revishead = {rev: True for rev in self._indexbyrev} for rev, entry in self._indexbyrev.items(): # Unset head flag for all seen parents. revishead[self.rev(entry[b'p1'])] = False revishead[self.rev(entry[b'p2'])] = False return [rev for rev, ishead in sorted(revishead.items()) if ishead] def heads(self, start=None, stop=None): # This is copied from revlog.py. if start is None and stop is None: if not len(self): return [nullid] return [self.node(r) for r in self._headrevs()] if start is None: start = nullid if stop is None: stop = [] stoprevs = set([self.rev(n) for n in stop]) startrev = self.rev(start) reachable = {startrev} heads = {startrev} parentrevs = self.parentrevs for r in self.revs(start=startrev + 1): for p in parentrevs(r): if p in reachable: if r not in stoprevs: reachable.add(r) heads.add(r) if p in heads and p not in stoprevs: heads.remove(p) return [self.node(r) for r in heads] def children(self, node): validatenode(node) # This is a copy of revlog.children(). c = [] p = self.rev(node) for r in self.revs(start=p + 1): prevs = [pr for pr in self.parentrevs(r) if pr != nullrev] if prevs: for pr in prevs: if pr == p: c.append(self.node(r)) elif p == nullrev: c.append(self.node(r)) return c def getstrippoint(self, minlink): return storageutil.resolvestripinfo( minlink, len(self) - 1, self._headrevs(), self.linkrev, self.parentrevs) def strip(self, minlink, transaction): if not len(self): return rev, _ignored = self.getstrippoint(minlink) if rev == len(self): return # Purge index data starting at the requested revision. self._indexdata[rev:] = [] self._reflectindexupdate() def issimplestorefile(f, kind, st): if kind != stat.S_IFREG: return False if store.isrevlog(f, kind, st): return False # Ignore transaction undo files. if f.startswith('undo.'): return False # Otherwise assume it belongs to the simple store. return True class simplestore(store.encodedstore): def datafiles(self): for x in super(simplestore, self).datafiles(): yield x # Supplement with non-revlog files. extrafiles = self._walk('data', True, filefilter=issimplestorefile) for unencoded, encoded, size in extrafiles: try: unencoded = store.decodefilename(unencoded) except KeyError: unencoded = None yield unencoded, encoded, size def reposetup(ui, repo): if not repo.local(): return if isinstance(repo, bundlerepo.bundlerepository): raise error.Abort(_('cannot use simple store with bundlerepo')) class simplestorerepo(repo.__class__): def file(self, f): return filestorage(self.svfs, f) repo.__class__ = simplestorerepo def featuresetup(ui, supported): supported.add(REQUIREMENT) def newreporequirements(orig, ui, createopts): """Modifies default requirements for new repos to use the simple store.""" requirements = orig(ui, createopts) # These requirements are only used to affect creation of the store # object. We have our own store. So we can remove them. # TODO do this once we feel like taking the test hit. #if 'fncache' in requirements: # requirements.remove('fncache') #if 'dotencode' in requirements: # requirements.remove('dotencode') requirements.add(REQUIREMENT) return requirements def makestore(orig, requirements, path, vfstype): if REQUIREMENT not in requirements: return orig(requirements, path, vfstype) return simplestore(path, vfstype) def verifierinit(orig, self, *args, **kwargs): orig(self, *args, **kwargs) # We don't care that files in the store don't align with what is # advertised. So suppress these warnings. self.warnorphanstorefiles = False def extsetup(ui): localrepo.featuresetupfuncs.add(featuresetup) extensions.wrapfunction(localrepo, 'newreporequirements', newreporequirements) extensions.wrapfunction(localrepo, 'makestore', makestore) extensions.wrapfunction(verify.verifier, '__init__', verifierinit)