branchcache: add a "pure topological head" fast path
In a narrow but actually quick common case, all topological heads are all on
the same branch and all open. In this case, computing the branch map is very
simple. We can quickly detect situation where this situation will not change.
So we update the V3 format to be able to express this situation and upgrade the
update code to detect we remains in that mode.
The branch cache is populated with the actual value when the branch map is
accessed, but the update_disk method can do the update without needing to
populate it.
"""This unit test primarily tests parsers.parse_index2().
It also checks certain aspects of the parsers module as a whole.
"""
import os
import struct
import subprocess
import sys
import unittest
from mercurial.node import (
bin,
hex,
nullrev,
sha1nodeconstants,
)
from mercurial import (
policy,
pycompat,
)
from mercurial.revlogutils import (
constants,
)
parsers = policy.importmod('parsers')
# original python implementation
def gettype(q):
return int(q & 0xFFFF)
def offset_type(offset, type):
return int(int(offset) << 16 | type)
indexformatng = ">Qiiiiii20s12x"
def py_parseindex(data, inline):
s = 64
cache = None
index = []
nodemap = {sha1nodeconstants.nullid: nullrev}
n = off = 0
l = len(data) - s
append = index.append
if inline:
cache = (0, data)
while off <= l:
e = struct.unpack(indexformatng, data[off : off + s])
e = e + (
0,
0,
constants.COMP_MODE_INLINE,
constants.COMP_MODE_INLINE,
constants.RANK_UNKNOWN,
)
nodemap[e[7]] = n
append(e)
n += 1
if e[1] < 0:
break
off += e[1] + s
else:
while off <= l:
e = struct.unpack(indexformatng, data[off : off + s])
e = e + (
0,
0,
constants.COMP_MODE_INLINE,
constants.COMP_MODE_INLINE,
constants.RANK_UNKNOWN,
)
nodemap[e[7]] = n
append(e)
n += 1
off += s
e = list(index[0])
type = gettype(e[0])
e[0] = offset_type(0, type)
index[0] = tuple(e)
return index, cache
data_inlined = (
b'\x00\x01\x00\x01\x00\x00\x00\x00\x00\x00\x01\x8c'
b'\x00\x00\x04\x07\x00\x00\x00\x00\x00\x00\x15\x15\xff\xff\xff'
b'\xff\xff\xff\xff\xff\xebG\x97\xb7\x1fB\x04\xcf\x13V\x81\tw\x1b'
b'w\xdduR\xda\xc6\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
b'x\x9c\x9d\x93?O\xc30\x10\xc5\xf7|\x8a\xdb\x9a\xa8m\x06\xd8*\x95'
b'\x81B\xa1\xa2\xa2R\xcb\x86Pd\x9a\x0b5$vd_\x04\xfd\xf6\x9c\xff@'
b'\x11!\x0b\xd9\xec\xf7\xbbw\xe7gG6\xad6\x04\xdaN\xc0\x92\xa0$)'
b'\xb1\x82\xa2\xd1%\x16\xa4\x8b7\xa9\xca\xd4-\xb2Y\x02\xfc\xc9'
b'\xcaS\xf9\xaeX\xed\xb6\xd77Q\x02\x83\xd4\x19\xf5--Y\xea\xe1W'
b'\xab\xed\x10\xceR\x0f_\xdf\xdf\r\xe1,\xf5\xf0\xcb\xf5 \xceR\x0f'
b'_\xdc\x0e\x0e\xc3R\x0f_\xae\x96\x9b!\x9e\xa5\x1e\xbf\xdb,\x06'
b'\xc7q\x9a/\x88\x82\xc3B\xea\xb5\xb4TJ\x93\xb6\x82\x0e\xe16\xe6'
b'KQ\xdb\xaf\xecG\xa3\xd1 \x01\xd3\x0b_^\xe8\xaa\xa0\xae\xad\xd1'
b'&\xbef\x1bz\x08\xb0|\xc9Xz\x06\xf6Z\x91\x90J\xaa\x17\x90\xaa'
b'\xd2\xa6\x11$5C\xcf\xba#\xa0\x03\x02*2\x92-\xfc\xb1\x94\xdf\xe2'
b'\xae\xb8\'m\x8ey0^\x85\xd3\x82\xb4\xf0`:\x9c\x00\x8a\xfd\x01'
b'\xb0\xc6\x86\x8b\xdd\xae\x80\xf3\xa9\x9fd\x16\n\x00R%\x1a\x06'
b'\xe9\xd8b\x98\x1d\xf4\xf3+\x9bf\x01\xd8p\x1b\xf3.\xed\x9f^g\xc3'
b'^\xd9W81T\xdb\xd5\x04sx|\xf2\xeb\xd6`%?x\xed"\x831\xbf\xf3\xdc'
b'b\xeb%gaY\xe1\xad\x9f\xb9f\'1w\xa9\xa5a\x83s\x82J\xb98\xbc4\x8b'
b'\x83\x00\x9f$z\xb8#\xa5\xb1\xdf\x98\xd9\xec\x1b\x89O\xe3Ts\x9a4'
b'\x17m\x8b\xfc\x8f\xa5\x95\x9a\xfc\xfa\xed,\xe5|\xa1\xfe\x15\xb9'
b'\xbc\xb2\x93\x1f\xf2\x95\xff\xdf,\x1a\xc5\xe7\x17*\x93Oz:>\x0e'
)
data_non_inlined = (
b'\x00\x00\x00\x01\x00\x00\x00\x00\x00\x01D\x19'
b'\x00\x07e\x12\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff'
b'\xff\xff\xff\xff\xd1\xf4\xbb\xb0\xbe\xfc\x13\xbd\x8c\xd3\x9d'
b'\x0f\xcd\xd9;\x8c\x07\x8cJ/\x00\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x00\x00\x00\x00\x00\x00\x01D\x19\x00\x00\x00\x00\x00\xdf\x00'
b'\x00\x01q\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x00\xff'
b'\xff\xff\xff\xc1\x12\xb9\x04\x96\xa4Z1t\x91\xdfsJ\x90\xf0\x9bh'
b'\x07l&\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
b'\x00\x01D\xf8\x00\x00\x00\x00\x01\x1b\x00\x00\x01\xb8\x00\x00'
b'\x00\x01\x00\x00\x00\x02\x00\x00\x00\x01\xff\xff\xff\xff\x02\n'
b'\x0e\xc6&\xa1\x92\xae6\x0b\x02i\xfe-\xe5\xbao\x05\xd1\xe7\x00'
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01F'
b'\x13\x00\x00\x00\x00\x01\xec\x00\x00\x03\x06\x00\x00\x00\x01'
b'\x00\x00\x00\x03\x00\x00\x00\x02\xff\xff\xff\xff\x12\xcb\xeby1'
b'\xb6\r\x98B\xcb\x07\xbd`\x8f\x92\xd9\xc4\x84\xbdK\x00\x00\x00'
b'\x00\x00\x00\x00\x00\x00\x00\x00\x00'
)
def parse_index2(data, inline, format=constants.REVLOGV1):
index, chunkcache = parsers.parse_index2(data, inline, format=format)
return list(index), chunkcache
def importparsers(hexversion):
"""Import mercurial.parsers with the given sys.hexversion."""
# The file parsers.c inspects sys.hexversion to determine the version
# of the currently-running Python interpreter, so we monkey-patch
# sys.hexversion to simulate using different versions.
code = (
"import sys; sys.hexversion=%s; "
"import mercurial.cext.parsers" % hexversion
)
cmd = "\"%s\" -c \"%s\"" % (os.environ['PYTHON'], code)
# We need to do these tests inside a subprocess because parser.c's
# version-checking code happens inside the module init function, and
# when using reload() to reimport an extension module, "The init function
# of extension modules is not called a second time"
# (from http://docs.python.org/2/library/functions.html?#reload).
p = subprocess.Popen(
cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT
)
return p.communicate() # returns stdout, stderr
def hexfailmsg(testnumber, hexversion, stdout, expected):
try:
hexstring = hex(hexversion)
except TypeError:
hexstring = None
return (
"FAILED: version test #%s with Python %s and patched "
"sys.hexversion %r (%r):\n Expected %s but got:\n-->'%s'\n"
% (
testnumber,
sys.version_info,
hexversion,
hexstring,
expected,
stdout,
)
)
def makehex(major, minor, micro):
return int("%x%02x%02x00" % (major, minor, micro), 16)
class parseindex2tests(unittest.TestCase):
def assertversionokay(self, testnumber, hexversion):
stdout, stderr = importparsers(hexversion)
self.assertFalse(
stdout, hexfailmsg(testnumber, hexversion, stdout, 'no stdout')
)
def assertversionfail(self, testnumber, hexversion):
stdout, stderr = importparsers(hexversion)
# We include versionerrortext to distinguish from other ImportErrors.
errtext = b"ImportError: %s" % pycompat.sysbytes(
parsers.versionerrortext
)
self.assertIn(
errtext,
stdout,
hexfailmsg(
testnumber,
hexversion,
stdout,
expected="stdout to contain %r" % errtext,
),
)
def testversiondetection(self):
"""Check the version-detection logic when importing parsers."""
# Only test the version-detection logic if it is present.
try:
parsers.versionerrortext
except AttributeError:
return
info = sys.version_info
major, minor, micro = info[0], info[1], info[2]
# Test same major-minor versions.
self.assertversionokay(1, makehex(major, minor, micro))
self.assertversionokay(2, makehex(major, minor, micro + 1))
# Test different major-minor versions.
self.assertversionfail(3, makehex(major + 1, minor, micro))
self.assertversionfail(4, makehex(major, minor + 1, micro))
self.assertversionfail(5, "'foo'")
def testbadargs(self):
# Check that parse_index2() raises TypeError on bad arguments.
with self.assertRaises(TypeError):
parse_index2(0, True)
def testparseindexfile(self):
# Check parsers.parse_index2() on an index file against the
# original Python implementation of parseindex, both with and
# without inlined data.
want = py_parseindex(data_inlined, True)
got = parse_index2(data_inlined, True)
self.assertEqual(want, got) # inline data
want = py_parseindex(data_non_inlined, False)
got = parse_index2(data_non_inlined, False)
self.assertEqual(want, got) # no inline data
ix = parsers.parse_index2(data_inlined, True)[0]
for i, r in enumerate(ix):
if r[7] == sha1nodeconstants.nullid:
i = -1
try:
self.assertEqual(
ix[r[7]],
i,
'Reverse lookup inconsistent for %r' % hex(r[7]),
)
except TypeError:
# pure version doesn't support this
break
def testminusone(self):
want = (
0,
0,
0,
-1,
-1,
-1,
-1,
sha1nodeconstants.nullid,
0,
0,
constants.COMP_MODE_INLINE,
constants.COMP_MODE_INLINE,
constants.RANK_UNKNOWN,
)
index, junk = parsers.parse_index2(data_inlined, True)
got = index[-1]
self.assertEqual(want, got) # inline data
index, junk = parsers.parse_index2(data_non_inlined, False)
got = index[-1]
self.assertEqual(want, got) # no inline data
def testdelitemwithoutnodetree(self):
index, _junk = parsers.parse_index2(data_non_inlined, False)
def hexrev(rev):
if rev == nullrev:
return b'\xff\xff\xff\xff'
else:
return bin('%08x' % rev)
def appendrev(p1, p2=nullrev):
# node won't matter for this test, let's just make sure
# they don't collide. Other data don't matter either.
node = hexrev(p1) + hexrev(p2) + b'.' * 12
e = (
0,
0,
12,
1,
34,
p1,
p2,
node,
0,
0,
constants.COMP_MODE_INLINE,
constants.COMP_MODE_INLINE,
constants.RANK_UNKNOWN,
)
index.append(e)
appendrev(4)
appendrev(5)
appendrev(6)
self.assertEqual(len(index), 7)
del index[1:-1]
# assertions that failed before correction
self.assertEqual(len(index), 1) # was 4
headrevs = getattr(index, 'headrevs', None)
if headrevs is not None: # not implemented in pure
self.assertEqual(index.headrevs(), [0]) # gave ValueError
if __name__ == '__main__':
import silenttestrunner
silenttestrunner.main(__name__)