Mercurial > hg
view mercurial/pure/parsers.py @ 39631:b9e453d683a1
exchangev2: fetch changeset revisions
All Mercurial repository data is derived from changesets:
you can't do anything unless you have changesets. Therefore,
it makes sense for changesets to be the first piece of data
that we transfer as part of pull.
To do this, we call our new "changesetdata" command, requesting
parents and revision data. This gives us all the data that a
changegroup delta group would give us. We simply normalize
this data into what addgroup() expects and call that API on
the changelog to bulk insert revisions into the changelog.
Code in this commit is heavily borrowed from
changegroup.cg1unpacker.apply().
Differential Revision: https://phab.mercurial-scm.org/D4482
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Wed, 12 Sep 2018 10:01:36 -0700 |
parents | 5961517fd2a8 |
children | 2372284d9457 |
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# parsers.py - Python implementation of parsers.c # # Copyright 2009 Matt Mackall <mpm@selenic.com> and others # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import absolute_import import struct import zlib from ..node import nullid from .. import pycompat stringio = pycompat.bytesio _pack = struct.pack _unpack = struct.unpack _compress = zlib.compress _decompress = zlib.decompress # Some code below makes tuples directly because it's more convenient. However, # code outside this module should always use dirstatetuple. def dirstatetuple(*x): # x is a tuple return x indexformatng = ">Qiiiiii20s12x" indexfirst = struct.calcsize('Q') sizeint = struct.calcsize('i') indexsize = struct.calcsize(indexformatng) def gettype(q): return int(q & 0xFFFF) def offset_type(offset, type): return int(int(offset) << 16 | type) class BaseIndexObject(object): def __len__(self): return self._lgt + len(self._extra) def append(self, tup): self._extra.append(tup) def _check_index(self, i): if not isinstance(i, int): raise TypeError("expecting int indexes") if i < 0 or i >= len(self): raise IndexError def __getitem__(self, i): if i == -1: return (0, 0, 0, -1, -1, -1, -1, nullid) self._check_index(i) if i >= self._lgt: return self._extra[i - self._lgt] index = self._calculate_index(i) r = struct.unpack(indexformatng, self._data[index:index + indexsize]) if i == 0: e = list(r) type = gettype(e[0]) e[0] = offset_type(0, type) return tuple(e) return r class IndexObject(BaseIndexObject): def __init__(self, data): assert len(data) % indexsize == 0 self._data = data self._lgt = len(data) // indexsize self._extra = [] def _calculate_index(self, i): return i * indexsize def __delitem__(self, i): if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: raise ValueError("deleting slices only supports a:-1 with step 1") i = i.start self._check_index(i) if i < self._lgt: self._data = self._data[:i * indexsize] self._lgt = i self._extra = [] else: self._extra = self._extra[:i - self._lgt] class InlinedIndexObject(BaseIndexObject): def __init__(self, data, inline=0): self._data = data self._lgt = self._inline_scan(None) self._inline_scan(self._lgt) self._extra = [] def _inline_scan(self, lgt): off = 0 if lgt is not None: self._offsets = [0] * lgt count = 0 while off <= len(self._data) - indexsize: s, = struct.unpack('>i', self._data[off + indexfirst:off + sizeint + indexfirst]) if lgt is not None: self._offsets[count] = off count += 1 off += indexsize + s if off != len(self._data): raise ValueError("corrupted data") return count def __delitem__(self, i): if not isinstance(i, slice) or not i.stop == -1 or i.step is not None: raise ValueError("deleting slices only supports a:-1 with step 1") i = i.start self._check_index(i) if i < self._lgt: self._offsets = self._offsets[:i] self._lgt = i self._extra = [] else: self._extra = self._extra[:i - self._lgt] def _calculate_index(self, i): return self._offsets[i] def parse_index2(data, inline): if not inline: return IndexObject(data), None return InlinedIndexObject(data, inline), (0, data) def parse_dirstate(dmap, copymap, st): parents = [st[:20], st[20: 40]] # dereference fields so they will be local in loop format = ">cllll" e_size = struct.calcsize(format) pos1 = 40 l = len(st) # the inner loop while pos1 < l: pos2 = pos1 + e_size e = _unpack(">cllll", st[pos1:pos2]) # a literal here is faster pos1 = pos2 + e[4] f = st[pos2:pos1] if '\0' in f: f, c = f.split('\0') copymap[f] = c dmap[f] = e[:4] return parents def pack_dirstate(dmap, copymap, pl, now): now = int(now) cs = stringio() write = cs.write write("".join(pl)) for f, e in dmap.iteritems(): if e[0] == 'n' and e[3] == now: # The file was last modified "simultaneously" with the current # write to dirstate (i.e. within the same second for file- # systems with a granularity of 1 sec). This commonly happens # for at least a couple of files on 'update'. # The user could change the file without changing its size # within the same second. Invalidate the file's mtime in # dirstate, forcing future 'status' calls to compare the # contents of the file if the size is the same. This prevents # mistakenly treating such files as clean. e = dirstatetuple(e[0], e[1], e[2], -1) dmap[f] = e if f in copymap: f = "%s\0%s" % (f, copymap[f]) e = _pack(">cllll", e[0], e[1], e[2], e[3], len(f)) write(e) write(f) return cs.getvalue()