|
|
# branchmap.py - logic to computes, maintain and stores branchmap for local repo
|
|
|
#
|
|
|
# Copyright 2005-2007 Olivia Mackall <olivia@selenic.com>
|
|
|
#
|
|
|
# This software may be used and distributed according to the terms of the
|
|
|
# GNU General Public License version 2 or any later version.
|
|
|
|
|
|
|
|
|
import struct
|
|
|
|
|
|
from .node import (
|
|
|
bin,
|
|
|
hex,
|
|
|
nullrev,
|
|
|
)
|
|
|
from . import (
|
|
|
encoding,
|
|
|
error,
|
|
|
obsolete,
|
|
|
pycompat,
|
|
|
scmutil,
|
|
|
util,
|
|
|
)
|
|
|
from .utils import (
|
|
|
repoviewutil,
|
|
|
stringutil,
|
|
|
)
|
|
|
|
|
|
if pycompat.TYPE_CHECKING:
|
|
|
from typing import (
|
|
|
Any,
|
|
|
Callable,
|
|
|
Dict,
|
|
|
Iterable,
|
|
|
List,
|
|
|
Optional,
|
|
|
Set,
|
|
|
Tuple,
|
|
|
Union,
|
|
|
)
|
|
|
from . import localrepo
|
|
|
|
|
|
assert any(
|
|
|
(
|
|
|
Any,
|
|
|
Callable,
|
|
|
Dict,
|
|
|
Iterable,
|
|
|
List,
|
|
|
Optional,
|
|
|
Set,
|
|
|
Tuple,
|
|
|
Union,
|
|
|
localrepo,
|
|
|
)
|
|
|
)
|
|
|
|
|
|
subsettable = repoviewutil.subsettable
|
|
|
|
|
|
calcsize = struct.calcsize
|
|
|
pack_into = struct.pack_into
|
|
|
unpack_from = struct.unpack_from
|
|
|
|
|
|
|
|
|
class BranchMapCache:
|
|
|
"""mapping of filtered views of repo with their branchcache"""
|
|
|
|
|
|
def __init__(self):
|
|
|
self._per_filter = {}
|
|
|
|
|
|
def __getitem__(self, repo):
|
|
|
self.updatecache(repo)
|
|
|
return self._per_filter[repo.filtername]
|
|
|
|
|
|
def updatecache(self, repo):
|
|
|
"""Update the cache for the given filtered view on a repository"""
|
|
|
# This can trigger updates for the caches for subsets of the filtered
|
|
|
# view, e.g. when there is no cache for this filtered view or the cache
|
|
|
# is stale.
|
|
|
|
|
|
cl = repo.changelog
|
|
|
filtername = repo.filtername
|
|
|
bcache = self._per_filter.get(filtername)
|
|
|
if bcache is None or not bcache.validfor(repo):
|
|
|
# cache object missing or cache object stale? Read from disk
|
|
|
bcache = branchcache.fromfile(repo)
|
|
|
|
|
|
revs = []
|
|
|
if bcache is None:
|
|
|
# no (fresh) cache available anymore, perhaps we can re-use
|
|
|
# the cache for a subset, then extend that to add info on missing
|
|
|
# revisions.
|
|
|
subsetname = subsettable.get(filtername)
|
|
|
if subsetname is not None:
|
|
|
subset = repo.filtered(subsetname)
|
|
|
bcache = self[subset].copy()
|
|
|
extrarevs = subset.changelog.filteredrevs - cl.filteredrevs
|
|
|
revs.extend(r for r in extrarevs if r <= bcache.tiprev)
|
|
|
else:
|
|
|
# nothing to fall back on, start empty.
|
|
|
bcache = branchcache(repo)
|
|
|
|
|
|
revs.extend(cl.revs(start=bcache.tiprev + 1))
|
|
|
if revs:
|
|
|
bcache.update(repo, revs)
|
|
|
|
|
|
assert bcache.validfor(repo), filtername
|
|
|
self._per_filter[repo.filtername] = bcache
|
|
|
|
|
|
def replace(self, repo, remotebranchmap):
|
|
|
"""Replace the branchmap cache for a repo with a branch mapping.
|
|
|
|
|
|
This is likely only called during clone with a branch map from a
|
|
|
remote.
|
|
|
|
|
|
"""
|
|
|
cl = repo.changelog
|
|
|
clrev = cl.rev
|
|
|
clbranchinfo = cl.branchinfo
|
|
|
rbheads = []
|
|
|
closed = set()
|
|
|
for bheads in remotebranchmap.values():
|
|
|
rbheads += bheads
|
|
|
for h in bheads:
|
|
|
r = clrev(h)
|
|
|
b, c = clbranchinfo(r)
|
|
|
if c:
|
|
|
closed.add(h)
|
|
|
|
|
|
if rbheads:
|
|
|
rtiprev = max((int(clrev(node)) for node in rbheads))
|
|
|
cache = branchcache(
|
|
|
repo,
|
|
|
remotebranchmap,
|
|
|
repo[rtiprev].node(),
|
|
|
rtiprev,
|
|
|
closednodes=closed,
|
|
|
)
|
|
|
|
|
|
# Try to stick it as low as possible
|
|
|
# filter above served are unlikely to be fetch from a clone
|
|
|
for candidate in (b'base', b'immutable', b'served'):
|
|
|
rview = repo.filtered(candidate)
|
|
|
if cache.validfor(rview):
|
|
|
self._per_filter[candidate] = cache
|
|
|
cache.write(rview)
|
|
|
return
|
|
|
|
|
|
def clear(self):
|
|
|
self._per_filter.clear()
|
|
|
|
|
|
def write_delayed(self, repo):
|
|
|
unfi = repo.unfiltered()
|
|
|
for filtername, cache in self._per_filter.items():
|
|
|
if cache._delayed:
|
|
|
repo = unfi.filtered(filtername)
|
|
|
cache.write(repo)
|
|
|
|
|
|
|
|
|
def _unknownnode(node):
|
|
|
"""raises ValueError when branchcache found a node which does not exists"""
|
|
|
raise ValueError('node %s does not exist' % node.hex())
|
|
|
|
|
|
|
|
|
def _branchcachedesc(repo):
|
|
|
if repo.filtername is not None:
|
|
|
return b'branch cache (%s)' % repo.filtername
|
|
|
else:
|
|
|
return b'branch cache'
|
|
|
|
|
|
|
|
|
class branchcache:
|
|
|
"""A dict like object that hold branches heads cache.
|
|
|
|
|
|
This cache is used to avoid costly computations to determine all the
|
|
|
branch heads of a repo.
|
|
|
|
|
|
The cache is serialized on disk in the following format:
|
|
|
|
|
|
<tip hex node> <tip rev number> [optional filtered repo hex hash]
|
|
|
<branch head hex node> <open/closed state> <branch name>
|
|
|
<branch head hex node> <open/closed state> <branch name>
|
|
|
...
|
|
|
|
|
|
The first line is used to check if the cache is still valid. If the
|
|
|
branch cache is for a filtered repo view, an optional third hash is
|
|
|
included that hashes the hashes of all filtered and obsolete revisions.
|
|
|
|
|
|
The open/closed state is represented by a single letter 'o' or 'c'.
|
|
|
This field can be used to avoid changelog reads when determining if a
|
|
|
branch head closes a branch or not.
|
|
|
"""
|
|
|
|
|
|
def __init__(
|
|
|
self,
|
|
|
repo,
|
|
|
entries=(),
|
|
|
tipnode=None,
|
|
|
tiprev=nullrev,
|
|
|
filteredhash=None,
|
|
|
closednodes=None,
|
|
|
hasnode=None,
|
|
|
):
|
|
|
# type: (localrepo.localrepository, Union[Dict[bytes, List[bytes]], Iterable[Tuple[bytes, List[bytes]]]], bytes, int, Optional[bytes], Optional[Set[bytes]], Optional[Callable[[bytes], bool]]) -> None
|
|
|
"""hasnode is a function which can be used to verify whether changelog
|
|
|
has a given node or not. If it's not provided, we assume that every node
|
|
|
we have exists in changelog"""
|
|
|
self._repo = repo
|
|
|
self._delayed = False
|
|
|
if tipnode is None:
|
|
|
self.tipnode = repo.nullid
|
|
|
else:
|
|
|
self.tipnode = tipnode
|
|
|
self.tiprev = tiprev
|
|
|
self.filteredhash = filteredhash
|
|
|
# closednodes is a set of nodes that close their branch. If the branch
|
|
|
# cache has been updated, it may contain nodes that are no longer
|
|
|
# heads.
|
|
|
if closednodes is None:
|
|
|
self._closednodes = set()
|
|
|
else:
|
|
|
self._closednodes = closednodes
|
|
|
self._entries = dict(entries)
|
|
|
# whether closed nodes are verified or not
|
|
|
self._closedverified = False
|
|
|
# branches for which nodes are verified
|
|
|
self._verifiedbranches = set()
|
|
|
self._hasnode = hasnode
|
|
|
if self._hasnode is None:
|
|
|
self._hasnode = lambda x: True
|
|
|
|
|
|
def _verifyclosed(self):
|
|
|
"""verify the closed nodes we have"""
|
|
|
if self._closedverified:
|
|
|
return
|
|
|
for node in self._closednodes:
|
|
|
if not self._hasnode(node):
|
|
|
_unknownnode(node)
|
|
|
|
|
|
self._closedverified = True
|
|
|
|
|
|
def _verifybranch(self, branch):
|
|
|
"""verify head nodes for the given branch."""
|
|
|
if branch not in self._entries or branch in self._verifiedbranches:
|
|
|
return
|
|
|
for n in self._entries[branch]:
|
|
|
if not self._hasnode(n):
|
|
|
_unknownnode(n)
|
|
|
|
|
|
self._verifiedbranches.add(branch)
|
|
|
|
|
|
def _verifyall(self):
|
|
|
"""verifies nodes of all the branches"""
|
|
|
needverification = set(self._entries.keys()) - self._verifiedbranches
|
|
|
for b in needverification:
|
|
|
self._verifybranch(b)
|
|
|
|
|
|
def __iter__(self):
|
|
|
return iter(self._entries)
|
|
|
|
|
|
def __setitem__(self, key, value):
|
|
|
self._entries[key] = value
|
|
|
|
|
|
def __getitem__(self, key):
|
|
|
self._verifybranch(key)
|
|
|
return self._entries[key]
|
|
|
|
|
|
def __contains__(self, key):
|
|
|
self._verifybranch(key)
|
|
|
return key in self._entries
|
|
|
|
|
|
def iteritems(self):
|
|
|
for k, v in self._entries.items():
|
|
|
self._verifybranch(k)
|
|
|
yield k, v
|
|
|
|
|
|
items = iteritems
|
|
|
|
|
|
def hasbranch(self, label):
|
|
|
"""checks whether a branch of this name exists or not"""
|
|
|
self._verifybranch(label)
|
|
|
return label in self._entries
|
|
|
|
|
|
@classmethod
|
|
|
def fromfile(cls, repo):
|
|
|
f = None
|
|
|
try:
|
|
|
f = repo.cachevfs(cls._filename(repo))
|
|
|
lineiter = iter(f)
|
|
|
cachekey = next(lineiter).rstrip(b'\n').split(b" ", 2)
|
|
|
last, lrev = cachekey[:2]
|
|
|
last, lrev = bin(last), int(lrev)
|
|
|
filteredhash = None
|
|
|
hasnode = repo.changelog.hasnode
|
|
|
if len(cachekey) > 2:
|
|
|
filteredhash = bin(cachekey[2])
|
|
|
bcache = cls(
|
|
|
repo,
|
|
|
tipnode=last,
|
|
|
tiprev=lrev,
|
|
|
filteredhash=filteredhash,
|
|
|
hasnode=hasnode,
|
|
|
)
|
|
|
if not bcache.validfor(repo):
|
|
|
# invalidate the cache
|
|
|
raise ValueError('tip differs')
|
|
|
bcache.load(repo, lineiter)
|
|
|
except (IOError, OSError):
|
|
|
return None
|
|
|
|
|
|
except Exception as inst:
|
|
|
if repo.ui.debugflag:
|
|
|
msg = b'invalid %s: %s\n'
|
|
|
repo.ui.debug(
|
|
|
msg
|
|
|
% (
|
|
|
_branchcachedesc(repo),
|
|
|
stringutil.forcebytestr(inst),
|
|
|
)
|
|
|
)
|
|
|
bcache = None
|
|
|
|
|
|
finally:
|
|
|
if f:
|
|
|
f.close()
|
|
|
|
|
|
return bcache
|
|
|
|
|
|
def load(self, repo, lineiter):
|
|
|
"""fully loads the branchcache by reading from the file using the line
|
|
|
iterator passed"""
|
|
|
for line in lineiter:
|
|
|
line = line.rstrip(b'\n')
|
|
|
if not line:
|
|
|
continue
|
|
|
node, state, label = line.split(b" ", 2)
|
|
|
if state not in b'oc':
|
|
|
raise ValueError('invalid branch state')
|
|
|
label = encoding.tolocal(label.strip())
|
|
|
node = bin(node)
|
|
|
self._entries.setdefault(label, []).append(node)
|
|
|
if state == b'c':
|
|
|
self._closednodes.add(node)
|
|
|
|
|
|
@staticmethod
|
|
|
def _filename(repo):
|
|
|
"""name of a branchcache file for a given repo or repoview"""
|
|
|
filename = b"branch2"
|
|
|
if repo.filtername:
|
|
|
filename = b'%s-%s' % (filename, repo.filtername)
|
|
|
return filename
|
|
|
|
|
|
def validfor(self, repo):
|
|
|
"""check that cache contents are valid for (a subset of) this repo
|
|
|
|
|
|
- False when the order of changesets changed or if we detect a strip.
|
|
|
- True when cache is up-to-date for the current repo or its subset."""
|
|
|
try:
|
|
|
node = repo.changelog.node(self.tiprev)
|
|
|
except IndexError:
|
|
|
# changesets were stripped and now we don't even have enough to
|
|
|
# find tiprev
|
|
|
return False
|
|
|
if self.tipnode != node:
|
|
|
# tiprev doesn't correspond to tipnode: repo was stripped, or this
|
|
|
# repo has a different order of changesets
|
|
|
return False
|
|
|
tiphash = scmutil.filteredhash(repo, self.tiprev, needobsolete=True)
|
|
|
# hashes don't match if this repo view has a different set of filtered
|
|
|
# revisions (e.g. due to phase changes) or obsolete revisions (e.g.
|
|
|
# history was rewritten)
|
|
|
return self.filteredhash == tiphash
|
|
|
|
|
|
def _branchtip(self, heads):
|
|
|
"""Return tuple with last open head in heads and false,
|
|
|
otherwise return last closed head and true."""
|
|
|
tip = heads[-1]
|
|
|
closed = True
|
|
|
for h in reversed(heads):
|
|
|
if h not in self._closednodes:
|
|
|
tip = h
|
|
|
closed = False
|
|
|
break
|
|
|
return tip, closed
|
|
|
|
|
|
def branchtip(self, branch):
|
|
|
"""Return the tipmost open head on branch head, otherwise return the
|
|
|
tipmost closed head on branch.
|
|
|
Raise KeyError for unknown branch."""
|
|
|
return self._branchtip(self[branch])[0]
|
|
|
|
|
|
def iteropen(self, nodes):
|
|
|
return (n for n in nodes if n not in self._closednodes)
|
|
|
|
|
|
def branchheads(self, branch, closed=False):
|
|
|
self._verifybranch(branch)
|
|
|
heads = self._entries[branch]
|
|
|
if not closed:
|
|
|
heads = list(self.iteropen(heads))
|
|
|
return heads
|
|
|
|
|
|
def iterbranches(self):
|
|
|
for bn, heads in self.items():
|
|
|
yield (bn, heads) + self._branchtip(heads)
|
|
|
|
|
|
def iterheads(self):
|
|
|
"""returns all the heads"""
|
|
|
self._verifyall()
|
|
|
return self._entries.values()
|
|
|
|
|
|
def copy(self):
|
|
|
"""return an deep copy of the branchcache object"""
|
|
|
return type(self)(
|
|
|
self._repo,
|
|
|
self._entries,
|
|
|
self.tipnode,
|
|
|
self.tiprev,
|
|
|
self.filteredhash,
|
|
|
self._closednodes,
|
|
|
)
|
|
|
|
|
|
def write(self, repo):
|
|
|
tr = repo.currenttransaction()
|
|
|
if not getattr(tr, 'finalized', True):
|
|
|
# Avoid premature writing.
|
|
|
#
|
|
|
# (The cache warming setup by localrepo will update the file later.)
|
|
|
self._delayed = True
|
|
|
return
|
|
|
try:
|
|
|
filename = self._filename(repo)
|
|
|
with repo.cachevfs(filename, b"w", atomictemp=True) as f:
|
|
|
cachekey = [hex(self.tipnode), b'%d' % self.tiprev]
|
|
|
if self.filteredhash is not None:
|
|
|
cachekey.append(hex(self.filteredhash))
|
|
|
f.write(b" ".join(cachekey) + b'\n')
|
|
|
nodecount = 0
|
|
|
for label, nodes in sorted(self._entries.items()):
|
|
|
label = encoding.fromlocal(label)
|
|
|
for node in nodes:
|
|
|
nodecount += 1
|
|
|
if node in self._closednodes:
|
|
|
state = b'c'
|
|
|
else:
|
|
|
state = b'o'
|
|
|
f.write(b"%s %s %s\n" % (hex(node), state, label))
|
|
|
repo.ui.log(
|
|
|
b'branchcache',
|
|
|
b'wrote %s with %d labels and %d nodes\n',
|
|
|
_branchcachedesc(repo),
|
|
|
len(self._entries),
|
|
|
nodecount,
|
|
|
)
|
|
|
self._delayed = False
|
|
|
except (IOError, OSError, error.Abort) as inst:
|
|
|
# Abort may be raised by read only opener, so log and continue
|
|
|
repo.ui.debug(
|
|
|
b"couldn't write branch cache: %s\n"
|
|
|
% stringutil.forcebytestr(inst)
|
|
|
)
|
|
|
|
|
|
def update(self, repo, revgen):
|
|
|
"""Given a branchhead cache, self, that may have extra nodes or be
|
|
|
missing heads, and a generator of nodes that are strictly a superset of
|
|
|
heads missing, this function updates self to be correct.
|
|
|
"""
|
|
|
starttime = util.timer()
|
|
|
cl = repo.changelog
|
|
|
# collect new branch entries
|
|
|
newbranches = {}
|
|
|
getbranchinfo = repo.revbranchcache().branchinfo
|
|
|
for r in revgen:
|
|
|
branch, closesbranch = getbranchinfo(r)
|
|
|
newbranches.setdefault(branch, []).append(r)
|
|
|
if closesbranch:
|
|
|
self._closednodes.add(cl.node(r))
|
|
|
|
|
|
# new tip revision which we found after iterating items from new
|
|
|
# branches
|
|
|
ntiprev = self.tiprev
|
|
|
|
|
|
# Delay fetching the topological heads until they are needed.
|
|
|
# A repository without non-continous branches can skip this part.
|
|
|
topoheads = None
|
|
|
|
|
|
# If a changeset is visible, its parents must be visible too, so
|
|
|
# use the faster unfiltered parent accessor.
|
|
|
parentrevs = repo.unfiltered().changelog.parentrevs
|
|
|
|
|
|
# Faster than using ctx.obsolete()
|
|
|
obsrevs = obsolete.getrevs(repo, b'obsolete')
|
|
|
|
|
|
for branch, newheadrevs in newbranches.items():
|
|
|
# For every branch, compute the new branchheads.
|
|
|
# A branchhead is a revision such that no descendant is on
|
|
|
# the same branch.
|
|
|
#
|
|
|
# The branchheads are computed iteratively in revision order.
|
|
|
# This ensures topological order, i.e. parents are processed
|
|
|
# before their children. Ancestors are inclusive here, i.e.
|
|
|
# any revision is an ancestor of itself.
|
|
|
#
|
|
|
# Core observations:
|
|
|
# - The current revision is always a branchhead for the
|
|
|
# repository up to that point.
|
|
|
# - It is the first revision of the branch if and only if
|
|
|
# there was no branchhead before. In that case, it is the
|
|
|
# only branchhead as there are no possible ancestors on
|
|
|
# the same branch.
|
|
|
# - If a parent is on the same branch, a branchhead can
|
|
|
# only be an ancestor of that parent, if it is parent
|
|
|
# itself. Otherwise it would have been removed as ancestor
|
|
|
# of that parent before.
|
|
|
# - Therefore, if all parents are on the same branch, they
|
|
|
# can just be removed from the branchhead set.
|
|
|
# - If one parent is on the same branch and the other is not
|
|
|
# and there was exactly one branchhead known, the existing
|
|
|
# branchhead can only be an ancestor if it is the parent.
|
|
|
# Otherwise it would have been removed as ancestor of
|
|
|
# the parent before. The other parent therefore can't have
|
|
|
# a branchhead as ancestor.
|
|
|
# - In all other cases, the parents on different branches
|
|
|
# could have a branchhead as ancestor. Those parents are
|
|
|
# kept in the "uncertain" set. If all branchheads are also
|
|
|
# topological heads, they can't have descendants and further
|
|
|
# checks can be skipped. Otherwise, the ancestors of the
|
|
|
# "uncertain" set are removed from branchheads.
|
|
|
# This computation is heavy and avoided if at all possible.
|
|
|
bheads = self._entries.get(branch, [])
|
|
|
bheadset = {cl.rev(node) for node in bheads}
|
|
|
uncertain = set()
|
|
|
for newrev in sorted(newheadrevs):
|
|
|
if newrev in obsrevs:
|
|
|
# We ignore obsolete changesets as they shouldn't be
|
|
|
# considered heads.
|
|
|
continue
|
|
|
|
|
|
if not bheadset:
|
|
|
bheadset.add(newrev)
|
|
|
continue
|
|
|
|
|
|
parents = [p for p in parentrevs(newrev) if p != nullrev]
|
|
|
samebranch = set()
|
|
|
otherbranch = set()
|
|
|
obsparents = set()
|
|
|
for p in parents:
|
|
|
if p in obsrevs:
|
|
|
# We ignored this obsolete changeset earlier, but now
|
|
|
# that it has non-ignored children, we need to make
|
|
|
# sure their ancestors are not considered heads. To
|
|
|
# achieve that, we will simply treat this obsolete
|
|
|
# changeset as a parent from other branch.
|
|
|
obsparents.add(p)
|
|
|
elif p in bheadset or getbranchinfo(p)[0] == branch:
|
|
|
samebranch.add(p)
|
|
|
else:
|
|
|
otherbranch.add(p)
|
|
|
if not (len(bheadset) == len(samebranch) == 1):
|
|
|
uncertain.update(otherbranch)
|
|
|
uncertain.update(obsparents)
|
|
|
bheadset.difference_update(samebranch)
|
|
|
bheadset.add(newrev)
|
|
|
|
|
|
if uncertain:
|
|
|
if topoheads is None:
|
|
|
topoheads = set(cl.headrevs())
|
|
|
if bheadset - topoheads:
|
|
|
floorrev = min(bheadset)
|
|
|
if floorrev <= max(uncertain):
|
|
|
ancestors = set(cl.ancestors(uncertain, floorrev))
|
|
|
bheadset -= ancestors
|
|
|
if bheadset:
|
|
|
self[branch] = [cl.node(rev) for rev in sorted(bheadset)]
|
|
|
tiprev = max(newheadrevs)
|
|
|
if tiprev > ntiprev:
|
|
|
ntiprev = tiprev
|
|
|
|
|
|
if ntiprev > self.tiprev:
|
|
|
self.tiprev = ntiprev
|
|
|
self.tipnode = cl.node(ntiprev)
|
|
|
|
|
|
if not self.validfor(repo):
|
|
|
# old cache key is now invalid for the repo, but we've just updated
|
|
|
# the cache and we assume it's valid, so let's make the cache key
|
|
|
# valid as well by recomputing it from the cached data
|
|
|
self.tipnode = repo.nullid
|
|
|
self.tiprev = nullrev
|
|
|
for heads in self.iterheads():
|
|
|
if not heads:
|
|
|
# all revisions on a branch are obsolete
|
|
|
continue
|
|
|
# note: tiprev is not necessarily the tip revision of repo,
|
|
|
# because the tip could be obsolete (i.e. not a head)
|
|
|
tiprev = max(cl.rev(node) for node in heads)
|
|
|
if tiprev > self.tiprev:
|
|
|
self.tipnode = cl.node(tiprev)
|
|
|
self.tiprev = tiprev
|
|
|
self.filteredhash = scmutil.filteredhash(
|
|
|
repo, self.tiprev, needobsolete=True
|
|
|
)
|
|
|
|
|
|
duration = util.timer() - starttime
|
|
|
repo.ui.log(
|
|
|
b'branchcache',
|
|
|
b'updated %s in %.4f seconds\n',
|
|
|
_branchcachedesc(repo),
|
|
|
duration,
|
|
|
)
|
|
|
|
|
|
self.write(repo)
|
|
|
|
|
|
|
|
|
class remotebranchcache(branchcache):
|
|
|
"""Branchmap info for a remote connection, should not write locally"""
|
|
|
|
|
|
def write(self, repo):
|
|
|
pass
|
|
|
|
|
|
|
|
|
# Revision branch info cache
|
|
|
|
|
|
_rbcversion = b'-v1'
|
|
|
_rbcnames = b'rbc-names' + _rbcversion
|
|
|
_rbcrevs = b'rbc-revs' + _rbcversion
|
|
|
# [4 byte hash prefix][4 byte branch name number with sign bit indicating open]
|
|
|
_rbcrecfmt = b'>4sI'
|
|
|
_rbcrecsize = calcsize(_rbcrecfmt)
|
|
|
_rbcmininc = 64 * _rbcrecsize
|
|
|
_rbcnodelen = 4
|
|
|
_rbcbranchidxmask = 0x7FFFFFFF
|
|
|
_rbccloseflag = 0x80000000
|
|
|
|
|
|
|
|
|
class revbranchcache:
|
|
|
"""Persistent cache, mapping from revision number to branch name and close.
|
|
|
This is a low level cache, independent of filtering.
|
|
|
|
|
|
Branch names are stored in rbc-names in internal encoding separated by 0.
|
|
|
rbc-names is append-only, and each branch name is only stored once and will
|
|
|
thus have a unique index.
|
|
|
|
|
|
The branch info for each revision is stored in rbc-revs as constant size
|
|
|
records. The whole file is read into memory, but it is only 'parsed' on
|
|
|
demand. The file is usually append-only but will be truncated if repo
|
|
|
modification is detected.
|
|
|
The record for each revision contains the first 4 bytes of the
|
|
|
corresponding node hash, and the record is only used if it still matches.
|
|
|
Even a completely trashed rbc-revs fill thus still give the right result
|
|
|
while converging towards full recovery ... assuming no incorrectly matching
|
|
|
node hashes.
|
|
|
The record also contains 4 bytes where 31 bits contains the index of the
|
|
|
branch and the last bit indicate that it is a branch close commit.
|
|
|
The usage pattern for rbc-revs is thus somewhat similar to 00changelog.i
|
|
|
and will grow with it but be 1/8th of its size.
|
|
|
"""
|
|
|
|
|
|
def __init__(self, repo, readonly=True):
|
|
|
assert repo.filtername is None
|
|
|
self._repo = repo
|
|
|
self._names = [] # branch names in local encoding with static index
|
|
|
self._rbcrevs = bytearray()
|
|
|
self._rbcsnameslen = 0 # length of names read at _rbcsnameslen
|
|
|
try:
|
|
|
bndata = repo.cachevfs.read(_rbcnames)
|
|
|
self._rbcsnameslen = len(bndata) # for verification before writing
|
|
|
if bndata:
|
|
|
self._names = [
|
|
|
encoding.tolocal(bn) for bn in bndata.split(b'\0')
|
|
|
]
|
|
|
except (IOError, OSError):
|
|
|
if readonly:
|
|
|
# don't try to use cache - fall back to the slow path
|
|
|
self.branchinfo = self._branchinfo
|
|
|
|
|
|
if self._names:
|
|
|
try:
|
|
|
data = repo.cachevfs.read(_rbcrevs)
|
|
|
self._rbcrevs[:] = data
|
|
|
except (IOError, OSError) as inst:
|
|
|
repo.ui.debug(
|
|
|
b"couldn't read revision branch cache: %s\n"
|
|
|
% stringutil.forcebytestr(inst)
|
|
|
)
|
|
|
# remember number of good records on disk
|
|
|
self._rbcrevslen = min(
|
|
|
len(self._rbcrevs) // _rbcrecsize, len(repo.changelog)
|
|
|
)
|
|
|
if self._rbcrevslen == 0:
|
|
|
self._names = []
|
|
|
self._rbcnamescount = len(self._names) # number of names read at
|
|
|
# _rbcsnameslen
|
|
|
|
|
|
def _clear(self):
|
|
|
self._rbcsnameslen = 0
|
|
|
del self._names[:]
|
|
|
self._rbcnamescount = 0
|
|
|
self._rbcrevslen = len(self._repo.changelog)
|
|
|
self._rbcrevs = bytearray(self._rbcrevslen * _rbcrecsize)
|
|
|
util.clearcachedproperty(self, b'_namesreverse')
|
|
|
|
|
|
@util.propertycache
|
|
|
def _namesreverse(self):
|
|
|
return {b: r for r, b in enumerate(self._names)}
|
|
|
|
|
|
def branchinfo(self, rev):
|
|
|
"""Return branch name and close flag for rev, using and updating
|
|
|
persistent cache."""
|
|
|
changelog = self._repo.changelog
|
|
|
rbcrevidx = rev * _rbcrecsize
|
|
|
|
|
|
# avoid negative index, changelog.read(nullrev) is fast without cache
|
|
|
if rev == nullrev:
|
|
|
return changelog.branchinfo(rev)
|
|
|
|
|
|
# if requested rev isn't allocated, grow and cache the rev info
|
|
|
if len(self._rbcrevs) < rbcrevidx + _rbcrecsize:
|
|
|
return self._branchinfo(rev)
|
|
|
|
|
|
# fast path: extract data from cache, use it if node is matching
|
|
|
reponode = changelog.node(rev)[:_rbcnodelen]
|
|
|
cachenode, branchidx = unpack_from(
|
|
|
_rbcrecfmt, util.buffer(self._rbcrevs), rbcrevidx
|
|
|
)
|
|
|
close = bool(branchidx & _rbccloseflag)
|
|
|
if close:
|
|
|
branchidx &= _rbcbranchidxmask
|
|
|
if cachenode == b'\0\0\0\0':
|
|
|
pass
|
|
|
elif cachenode == reponode:
|
|
|
try:
|
|
|
return self._names[branchidx], close
|
|
|
except IndexError:
|
|
|
# recover from invalid reference to unknown branch
|
|
|
self._repo.ui.debug(
|
|
|
b"referenced branch names not found"
|
|
|
b" - rebuilding revision branch cache from scratch\n"
|
|
|
)
|
|
|
self._clear()
|
|
|
else:
|
|
|
# rev/node map has changed, invalidate the cache from here up
|
|
|
self._repo.ui.debug(
|
|
|
b"history modification detected - truncating "
|
|
|
b"revision branch cache to revision %d\n" % rev
|
|
|
)
|
|
|
truncate = rbcrevidx + _rbcrecsize
|
|
|
del self._rbcrevs[truncate:]
|
|
|
self._rbcrevslen = min(self._rbcrevslen, truncate)
|
|
|
|
|
|
# fall back to slow path and make sure it will be written to disk
|
|
|
return self._branchinfo(rev)
|
|
|
|
|
|
def _branchinfo(self, rev):
|
|
|
"""Retrieve branch info from changelog and update _rbcrevs"""
|
|
|
changelog = self._repo.changelog
|
|
|
b, close = changelog.branchinfo(rev)
|
|
|
if b in self._namesreverse:
|
|
|
branchidx = self._namesreverse[b]
|
|
|
else:
|
|
|
branchidx = len(self._names)
|
|
|
self._names.append(b)
|
|
|
self._namesreverse[b] = branchidx
|
|
|
reponode = changelog.node(rev)
|
|
|
if close:
|
|
|
branchidx |= _rbccloseflag
|
|
|
self._setcachedata(rev, reponode, branchidx)
|
|
|
return b, close
|
|
|
|
|
|
def setdata(self, rev, changelogrevision):
|
|
|
"""add new data information to the cache"""
|
|
|
branch, close = changelogrevision.branchinfo
|
|
|
|
|
|
if branch in self._namesreverse:
|
|
|
branchidx = self._namesreverse[branch]
|
|
|
else:
|
|
|
branchidx = len(self._names)
|
|
|
self._names.append(branch)
|
|
|
self._namesreverse[branch] = branchidx
|
|
|
if close:
|
|
|
branchidx |= _rbccloseflag
|
|
|
self._setcachedata(rev, self._repo.changelog.node(rev), branchidx)
|
|
|
# If no cache data were readable (non exists, bad permission, etc)
|
|
|
# the cache was bypassing itself by setting:
|
|
|
#
|
|
|
# self.branchinfo = self._branchinfo
|
|
|
#
|
|
|
# Since we now have data in the cache, we need to drop this bypassing.
|
|
|
if 'branchinfo' in vars(self):
|
|
|
del self.branchinfo
|
|
|
|
|
|
def _setcachedata(self, rev, node, branchidx):
|
|
|
"""Writes the node's branch data to the in-memory cache data."""
|
|
|
if rev == nullrev:
|
|
|
return
|
|
|
rbcrevidx = rev * _rbcrecsize
|
|
|
requiredsize = rbcrevidx + _rbcrecsize
|
|
|
rbccur = len(self._rbcrevs)
|
|
|
if rbccur < requiredsize:
|
|
|
# bytearray doesn't allocate extra space at least in Python 3.7.
|
|
|
# When multiple changesets are added in a row, precise resize would
|
|
|
# result in quadratic complexity. Overallocate to compensate by
|
|
|
# use the classic doubling technique for dynamic arrays instead.
|
|
|
# If there was a gap in the map before, less space will be reserved.
|
|
|
self._rbcrevs.extend(b'\0' * max(_rbcmininc, requiredsize))
|
|
|
pack_into(_rbcrecfmt, self._rbcrevs, rbcrevidx, node, branchidx)
|
|
|
self._rbcrevslen = min(self._rbcrevslen, rev)
|
|
|
|
|
|
tr = self._repo.currenttransaction()
|
|
|
if tr:
|
|
|
tr.addfinalize(b'write-revbranchcache', self.write)
|
|
|
|
|
|
def write(self, tr=None):
|
|
|
"""Save branch cache if it is dirty."""
|
|
|
repo = self._repo
|
|
|
wlock = None
|
|
|
step = b''
|
|
|
try:
|
|
|
# write the new names
|
|
|
if self._rbcnamescount < len(self._names):
|
|
|
wlock = repo.wlock(wait=False)
|
|
|
step = b' names'
|
|
|
self._writenames(repo)
|
|
|
|
|
|
# write the new revs
|
|
|
start = self._rbcrevslen * _rbcrecsize
|
|
|
if start != len(self._rbcrevs):
|
|
|
step = b''
|
|
|
if wlock is None:
|
|
|
wlock = repo.wlock(wait=False)
|
|
|
self._writerevs(repo, start)
|
|
|
|
|
|
except (IOError, OSError, error.Abort, error.LockError) as inst:
|
|
|
repo.ui.debug(
|
|
|
b"couldn't write revision branch cache%s: %s\n"
|
|
|
% (step, stringutil.forcebytestr(inst))
|
|
|
)
|
|
|
finally:
|
|
|
if wlock is not None:
|
|
|
wlock.release()
|
|
|
|
|
|
def _writenames(self, repo):
|
|
|
"""write the new branch names to revbranchcache"""
|
|
|
if self._rbcnamescount != 0:
|
|
|
f = repo.cachevfs.open(_rbcnames, b'ab')
|
|
|
if f.tell() == self._rbcsnameslen:
|
|
|
f.write(b'\0')
|
|
|
else:
|
|
|
f.close()
|
|
|
repo.ui.debug(b"%s changed - rewriting it\n" % _rbcnames)
|
|
|
self._rbcnamescount = 0
|
|
|
self._rbcrevslen = 0
|
|
|
if self._rbcnamescount == 0:
|
|
|
# before rewriting names, make sure references are removed
|
|
|
repo.cachevfs.unlinkpath(_rbcrevs, ignoremissing=True)
|
|
|
f = repo.cachevfs.open(_rbcnames, b'wb')
|
|
|
f.write(
|
|
|
b'\0'.join(
|
|
|
encoding.fromlocal(b)
|
|
|
for b in self._names[self._rbcnamescount :]
|
|
|
)
|
|
|
)
|
|
|
self._rbcsnameslen = f.tell()
|
|
|
f.close()
|
|
|
self._rbcnamescount = len(self._names)
|
|
|
|
|
|
def _writerevs(self, repo, start):
|
|
|
"""write the new revs to revbranchcache"""
|
|
|
revs = min(len(repo.changelog), len(self._rbcrevs) // _rbcrecsize)
|
|
|
with repo.cachevfs.open(_rbcrevs, b'ab') as f:
|
|
|
if f.tell() != start:
|
|
|
repo.ui.debug(
|
|
|
b"truncating cache/%s to %d\n" % (_rbcrevs, start)
|
|
|
)
|
|
|
f.seek(start)
|
|
|
if f.tell() != start:
|
|
|
start = 0
|
|
|
f.seek(start)
|
|
|
f.truncate()
|
|
|
end = revs * _rbcrecsize
|
|
|
f.write(self._rbcrevs[start:end])
|
|
|
self._rbcrevslen = revs
|
|
|
|
