author | Augie Fackler <augie@google.com> |
Wed, 09 Oct 2019 20:49:58 -0700 | |
changeset 43153 | 741fb1a95da2 |
parent 43085 | eef9a2d67051 |
child 48875 | 6000f5b25c9b |
permissions | -rw-r--r-- |
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# Copyright 2016-present Facebook. All Rights Reserved. |
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# |
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# revmap: trivial hg hash - linelog rev bidirectional map |
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# |
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# This software may be used and distributed according to the terms of the |
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# GNU General Public License version 2 or any later version. |
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from __future__ import absolute_import |
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import bisect |
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import io |
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import os |
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import struct |
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from mercurial.node import hex |
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from mercurial.pycompat import open |
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from mercurial import ( |
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error as hgerror, |
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pycompat, |
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) |
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from . import error |
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# the revmap file format is straightforward: |
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# |
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# 8 bytes: header |
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# 1 byte : flag for linelog revision 1 |
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# ? bytes: (optional) '\0'-terminated path string |
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# only exists if (flag & renameflag) != 0 |
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# 20 bytes: hg hash for linelog revision 1 |
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# 1 byte : flag for linelog revision 2 |
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# ? bytes: (optional) '\0'-terminated path string |
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# 20 bytes: hg hash for linelog revision 2 |
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# .... |
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# |
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# the implementation is kinda stupid: __init__ loads the whole revmap. |
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# no laziness. benchmark shows loading 10000 revisions is about 0.015 |
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# seconds, which looks enough for our use-case. if this implementation |
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# becomes a bottleneck, we can change it to lazily read the file |
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# from the end. |
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# whether the changeset is in the side branch. i.e. not in the linear main |
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# branch but only got referenced by lines in merge changesets. |
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sidebranchflag = 1 |
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# whether the changeset changes the file path (ie. is a rename) |
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renameflag = 2 |
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# len(mercurial.node.nullid) |
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_hshlen = 20 |
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class revmap(object): |
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"""trivial hg bin hash - linelog rev bidirectional map |
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also stores a flag (uint8) for each revision, and track renames. |
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""" |
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HEADER = b'REVMAP1\0' |
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def __init__(self, path=None): |
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"""create or load the revmap, optionally associate to a file |
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if path is None, the revmap is entirely in-memory. the caller is |
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responsible for locking. concurrent writes to a same file is unsafe. |
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the caller needs to make sure one file is associated to at most one |
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revmap object at a time.""" |
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self.path = path |
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self._rev2hsh = [None] |
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self._rev2flag = [None] |
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self._hsh2rev = {} |
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# since rename does not happen frequently, do not store path for every |
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# revision. self._renamerevs can be used for bisecting. |
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self._renamerevs = [0] |
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self._renamepaths = [b''] |
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self._lastmaxrev = -1 |
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if path: |
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if os.path.exists(path): |
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self._load() |
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else: |
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# write the header so "append" can do incremental updates |
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self.flush() |
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def copyfrom(self, rhs): |
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"""copy the map data from another revmap. do not affect self.path""" |
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self._rev2hsh = rhs._rev2hsh[:] |
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self._rev2flag = rhs._rev2flag[:] |
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self._hsh2rev = rhs._hsh2rev.copy() |
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self._renamerevs = rhs._renamerevs[:] |
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self._renamepaths = rhs._renamepaths[:] |
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self._lastmaxrev = -1 |
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@property |
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def maxrev(self): |
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"""return max linelog revision number""" |
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return len(self._rev2hsh) - 1 |
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def append(self, hsh, sidebranch=False, path=None, flush=False): |
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"""add a binary hg hash and return the mapped linelog revision. |
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if flush is True, incrementally update the file. |
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""" |
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if hsh in self._hsh2rev: |
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raise error.CorruptedFileError( |
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b'%r is in revmap already' % hex(hsh) |
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) |
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if len(hsh) != _hshlen: |
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raise hgerror.ProgrammingError( |
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b'hsh must be %d-char long' % _hshlen |
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) |
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idx = len(self._rev2hsh) |
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flag = 0 |
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if sidebranch: |
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flag |= sidebranchflag |
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if path is not None and path != self._renamepaths[-1]: |
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flag |= renameflag |
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self._renamerevs.append(idx) |
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self._renamepaths.append(path) |
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self._rev2hsh.append(hsh) |
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self._rev2flag.append(flag) |
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self._hsh2rev[hsh] = idx |
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if flush: |
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self.flush() |
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122 |
return idx |
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123 |
|
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def rev2hsh(self, rev): |
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"""convert linelog revision to hg hash. return None if not found.""" |
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if rev > self.maxrev or rev < 0: |
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return None |
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return self._rev2hsh[rev] |
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129 |
|
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def rev2flag(self, rev): |
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"""get the flag (uint8) for a given linelog revision. |
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return None if revision does not exist. |
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""" |
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if rev > self.maxrev or rev < 0: |
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return None |
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return self._rev2flag[rev] |
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137 |
|
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138 |
def rev2path(self, rev): |
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"""get the path for a given linelog revision. |
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return None if revision does not exist. |
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141 |
""" |
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if rev > self.maxrev or rev < 0: |
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143 |
return None |
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idx = bisect.bisect_right(self._renamerevs, rev) - 1 |
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return self._renamepaths[idx] |
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146 |
|
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def hsh2rev(self, hsh): |
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"""convert hg hash to linelog revision. return None if not found.""" |
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return self._hsh2rev.get(hsh) |
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150 |
|
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151 |
def clear(self, flush=False): |
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"""make the map empty. if flush is True, write to disk""" |
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153 |
# rev 0 is reserved, real rev starts from 1 |
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154 |
self._rev2hsh = [None] |
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155 |
self._rev2flag = [None] |
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156 |
self._hsh2rev = {} |
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157 |
self._rev2path = [b''] |
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158 |
self._lastmaxrev = -1 |
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|
159 |
if flush: |
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160 |
self.flush() |
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161 |
|
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162 |
def flush(self): |
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163 |
"""write the state down to the file""" |
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164 |
if not self.path: |
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|
165 |
return |
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166 |
if self._lastmaxrev == -1: # write the entire file |
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167 |
with open(self.path, b'wb') as f: |
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168 |
f.write(self.HEADER) |
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|
169 |
for i in pycompat.xrange(1, len(self._rev2hsh)): |
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170 |
self._writerev(i, f) |
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171 |
else: # append incrementally |
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172 |
with open(self.path, b'ab') as f: |
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|
173 |
for i in pycompat.xrange( |
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174 |
self._lastmaxrev + 1, len(self._rev2hsh) |
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175 |
): |
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|
176 |
self._writerev(i, f) |
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|
177 |
self._lastmaxrev = self.maxrev |
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|
178 |
|
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|
179 |
def _load(self): |
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|
180 |
"""load state from file""" |
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|
181 |
if not self.path: |
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|
182 |
return |
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|
183 |
# use local variables in a loop. CPython uses LOAD_FAST for them, |
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|
184 |
# which is faster than both LOAD_CONST and LOAD_GLOBAL. |
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|
185 |
flaglen = 1 |
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|
186 |
hshlen = _hshlen |
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|
187 |
with open(self.path, b'rb') as f: |
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|
188 |
if f.read(len(self.HEADER)) != self.HEADER: |
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|
189 |
raise error.CorruptedFileError() |
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|
190 |
self.clear(flush=False) |
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|
191 |
while True: |
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|
192 |
buf = f.read(flaglen) |
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|
193 |
if not buf: |
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|
194 |
break |
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|
195 |
flag = ord(buf) |
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|
196 |
rev = len(self._rev2hsh) |
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|
197 |
if flag & renameflag: |
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|
198 |
path = self._readcstr(f) |
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|
199 |
self._renamerevs.append(rev) |
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|
200 |
self._renamepaths.append(path) |
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|
201 |
hsh = f.read(hshlen) |
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|
202 |
if len(hsh) != hshlen: |
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changeset
|
203 |
raise error.CorruptedFileError() |
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changeset
|
204 |
self._hsh2rev[hsh] = rev |
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|
205 |
self._rev2flag.append(flag) |
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|
206 |
self._rev2hsh.append(hsh) |
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|
207 |
self._lastmaxrev = self.maxrev |
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|
208 |
|
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|
209 |
def _writerev(self, rev, f): |
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|
210 |
"""append a revision data to file""" |
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|
211 |
flag = self._rev2flag[rev] |
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|
212 |
hsh = self._rev2hsh[rev] |
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213 |
f.write(struct.pack(b'B', flag)) |
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|
214 |
if flag & renameflag: |
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|
215 |
path = self.rev2path(rev) |
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|
216 |
if path is None: |
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|
217 |
raise error.CorruptedFileError(b'cannot find path for %s' % rev) |
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|
218 |
f.write(path + b'\0') |
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|
219 |
f.write(hsh) |
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|
220 |
|
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|
221 |
@staticmethod |
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|
222 |
def _readcstr(f): |
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|
223 |
"""read a C-language-like '\0'-terminated string""" |
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224 |
buf = b'' |
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|
225 |
while True: |
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|
226 |
ch = f.read(1) |
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227 |
if not ch: # unexpected eof |
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|
228 |
raise error.CorruptedFileError() |
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229 |
if ch == b'\0': |
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230 |
break |
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|
231 |
buf += ch |
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|
232 |
return buf |
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|
233 |
|
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234 |
def __contains__(self, f): |
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"""(fctx or (node, path)) -> bool. |
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test if (node, path) is in the map, and is not in a side branch. |
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f can be either a tuple of (node, path), or a fctx. |
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""" |
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if isinstance(f, tuple): # f: (node, path) |
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hsh, path = f |
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else: # f: fctx |
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hsh, path = f.node(), f.path() |
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rev = self.hsh2rev(hsh) |
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if rev is None: |
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return False |
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if path is not None and path != self.rev2path(rev): |
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return False |
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return (self.rev2flag(rev) & sidebranchflag) == 0 |
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|
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|
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def getlastnode(path): |
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"""return the last hash in a revmap, without loading its full content. |
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this is equivalent to `m = revmap(path); m.rev2hsh(m.maxrev)`, but faster. |
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""" |
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hsh = None |
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try: |
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with open(path, b'rb') as f: |
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f.seek(-_hshlen, io.SEEK_END) |
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if f.tell() > len(revmap.HEADER): |
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hsh = f.read(_hshlen) |
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except IOError: |
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pass |
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return hsh |