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fossil.py
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fossil.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import io
import time
import zlib
import struct
import sqlite3
import calendar
import warnings
import collections
__version__ = '0.3.1'
try:
import numpy
NUMPY_AVAILABLE = True
except ImportError:
NUMPY_AVAILABLE = False
unsigned_to_signed = lambda v: v-0x100000000 if v & 0x80000000 else v
utf8_decode = lambda b: b.decode('utf-8')
text_escape = lambda s: s.replace('\\', '\\\\').replace(' ', '\\s').replace('\n', '\\n')
text_unescape = lambda s: s.replace('\\s', ' ').replace('\\n', '\n').replace('\\\\', '\\')
parse_dt = lambda s: calendar.timegm(time.strptime(s[:19], '%Y-%m-%dT%H:%M:%S'))
julian_to_unix = lambda t: (t-2440587.5)*86400
unix_to_julian = lambda t: t/86400 + 2440587.5
def base64_putint(v):
zdigits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~"
if not v:
return '0'
ret = ''
while v > 0:
ret += zdigits[v&0x3f]
v >>= 6
return ret
def base64_getint(buf, pos=0):
"""Returns the encoded integer and consumed string length."""
v = 0
for z, ch in enumerate(buf[pos:]):
c = base64_getint.zvalue[0x7f&ch]
if c < 0:
break
v = (v<<6) + c
else:
z += 1
return (v, pos+z)
base64_getint.zvalue = (
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, -1, -1, -1, -1, 36,
-1, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, -1, -1, -1, 63, -1,
)
def decompress(blob):
size = struct.unpack('>I', blob[:4])[0]
orig = zlib.decompress(blob[4:])
# not passed on pkgsrc.fossil
# assert len(orig) == size
return orig
if NUMPY_AVAILABLE:
def delta_checksum(blob):
dt = numpy.dtype(numpy.uint32)
dt = dt.newbyteorder('>')
m = len(blob) % 4
array = numpy.frombuffer(bytes(blob) + (b'\0' * (4-m)), dtype=dt)
return int(array.sum(dtype=dt))
else:
# can't calculate efficiently using native methods
def delta_checksum(blob):
checksum = 0
uint32 = 4294967296
ints, m = divmod(len(blob), 4)
for i in range(ints):
checksum = (checksum + struct.unpack('>I', blob[i*4:i*4+4])[0]) % uint32
rem = bytes(blob[ints*4:]) + (b'\0' * (4-m))
checksum = (checksum + struct.unpack('>I', rem)[0]) % uint32
return checksum
try:
from fossil_delta import apply_delta as _apply_delta
def delta_apply(blob, delta, check=False):
return _apply_delta(blob, delta)
except ImportError:
def delta_apply(blob, delta, check=False):
newblob = io.BytesIO()
mblob = memoryview(blob)
mdelta = memoryview(delta)
targetsize, pos = base64_getint(mdelta)
pos += 1 # \n
while pos < len(delta):
num, pos = base64_getint(mdelta, pos)
op = mdelta[pos]
if op == 64: # @
pos += 1
offset, pos = base64_getint(mdelta, pos)
pos += 1 # ,
newblob.write(mblob[offset:offset+num])
elif op == 58: # :
pos += 1
newblob.write(mdelta[pos:pos+num])
pos += num
elif op == 59: # ;
checksum = num
break
else:
raise ValueError('invalid delta encoding')
else:
raise ValueError('invalid delta encoding')
buf = newblob.getbuffer()
if targetsize != len(buf):
raise ValueError('delta decoding failed, size mismatch: %d, %d' %
(targetsize, len(buf)))
elif check:
if checksum != delta_checksum(buf):
raise ValueError('delta decoding failed, data mismatch')
return newblob.getvalue()
def remove_clearsign(blob):
clearsign_header = b'-----BEGIN PGP SIGNED MESSAGE-----'
pgpsign_header = b'-----BEGIN PGP SIGNATURE-----'
if not blob.startswith(clearsign_header):
return blob
lines = []
content = False
for k, ln in enumerate(blob.splitlines(True)):
if not ln.rstrip():
content = True
elif content:
if ln.rstrip() == pgpsign_header:
break
elif ln.startswith(b'- '):
lines.append(ln[2:])
else:
lines.append(ln)
return b''.join(lines)
class LRUCache(collections.UserDict):
def __init__(self, maxlen):
self.capacity = maxlen
self.data = collections.OrderedDict()
def __getitem__(self, key):
value = self.data.pop(key)
self.data[key] = value
return value
def get(self, key, default=None):
try:
value = self.data.pop(key)
self.data[key] = value
return value
except KeyError:
return default
def __setitem__(self, key, value):
if self.capacity:
try:
self.data.pop(key)
except KeyError:
if len(self.data) >= self.capacity:
self.data.popitem(last=False)
self.data[key] = value
class Artifact:
def __init__(self, blob=None, rid=None, uuid=None):
self.blob = blob
self.rid = rid
self.uuid = uuid
def __repr__(self):
return '<Artifact rid=%r, uuid=%r>' % (self.rid, self.uuid)
class File(Artifact):
def __repr__(self):
return '<File rid=%r, uuid=%r>' % (self.rid, self.uuid)
class StructuralArtifact(Artifact):
CARDTYPES = {
'A': 'attachment',
'B': 'baseline',
'C': 'comment',
'D': 'datetime',
'E': 'technote',
'F': 'file',
'G': 'thread_root',
'H': 'thread_title',
'I': 'in_reply_to',
'J': 'ticket_change',
'K': 'ticket_id',
'L': 'wiki_title',
'M': 'manifest',
'N': 'mimetype',
'P': 'parent_artifact',
'Q': 'cherry_pick',
'R': 'repository_checksum',
'T': 'tag',
'U': 'user_login',
'W': 'wiki_text',
'Z': 'checksum'
}
CARDTYPES_REV = {v:k for k,v in CARDTYPES.items()}
CARDMULTI = frozenset('FJMQT')
def __init__(self, blob=None, rid=None, uuid=None):
super().__init__(blob, rid, uuid)
self.cards = {}
self.parse()
@classmethod
def from_artifact(cls, artifact):
return cls(artifact.blob, artifact.rid, artifact.uuid)
def parse(self):
f = io.BytesIO(remove_clearsign(self.blob))
line = f.readline()
while line:
cmd, *toks = line.decode('utf-8').rstrip().split(' ')
if cmd in 'AFJT':
val = tuple(map(text_unescape, toks))
elif cmd in 'BGIKMNRZ':
val = toks[0]
elif cmd in 'CHLU':
val = text_unescape(toks[0])
elif cmd == 'D':
val = parse_dt(toks[0])
elif cmd == 'E':
toks[0] = parse_dt(toks[0])
val = tuple(toks)
elif cmd in 'PQ':
val = tuple(toks)
elif cmd == 'W':
size = int(toks[0])
val = f.read(size+1).decode('utf-8')
else:
raise ValueError('unrecognized card: ' + line.decode('utf-8').rstrip())
if cmd in self.CARDMULTI:
if cmd in self.cards:
self.cards[cmd].append(val)
else:
self.cards[cmd] = [val]
else:
self.cards[cmd] = val
line = f.readline()
def keys(self):
return self.cards.keys()
def __getitem__(self, key):
if key.upper() in self.cards:
return self.cards[key]
elif key in self.CARDTYPES_REV:
return self.cards[self.CARDTYPES_REV[key]]
else:
raise KeyError(key)
def __getattr__(self, key):
return self.__getitem__(key)
def __repr__(self):
return '<StructuralArtifact rid=%r, uuid=%r>' % (self.rid, self.uuid)
class Repo:
def __init__(self, repository, check=False, cachesize=64):
self.repository = repository
self.db = sqlite3.connect(repository)
self.db.row_factory = sqlite3.Row
self.db.execute('PRAGMA case_sensitive_like=1')
if check and not NUMPY_AVAILABLE:
warnings.warn('install numpy to calculate checksum faster')
self.check = check
self.cache = LRUCache(cachesize)
def artifact(self, key, type_=None):
'''Get an artifact by rid or uuid'''
if isinstance(key, int):
kwd = 'rid'
val = key
else:
kwd = 'uuid'
val = key
blob = None
for rid, uuid, content in self.execute(
"WITH RECURSIVE b(rid, uuid, content, depth) AS ("
"SELECT rid, uuid, content, 0 FROM blob WHERE %s = ? "
"UNION ALL "
"SELECT blob.rid, blob.uuid, blob.content, b.depth-1 "
"FROM blob, delta, b "
"WHERE delta.rid = b.rid AND blob.rid = delta.srcid"
") SELECT rid, uuid, content FROM b ORDER BY depth" % kwd, (val,)):
if rid in self.cache:
blob = self.cache[rid]
else:
if blob:
blob = delta_apply(blob, decompress(content), self.check)
else:
blob = decompress(content)
self.cache[rid] = blob
if not blob:
raise ValueError("can't find artifact: %s" % rid)
if type_ == 'structural':
return StructuralArtifact(blob, rid, uuid)
elif type_ == 'file':
return File(blob, rid, uuid)
else:
return Artifact(blob, rid, uuid)
def __getitem__(self, key):
return self.artifact(key)
def file(self, key):
return self.artifact(key, 'file')
def manifest(self, key):
return self.artifact(key, 'structural')
def find_artifact(self, prefix):
row = self.execute('SELECT rid, uuid FROM blob WHERE uuid LIKE ?',
(prefix+'%',)).fetchone()
if row:
return tuple(row)
else:
raise KeyError("can't find a blob with prefix " + prefix)
def to_uuid(self, rid):
row = self.execute('SELECT uuid FROM blob WHERE rid = ?',
(rid,)).fetchone()
if row:
return row[0]
else:
raise IndexError('rid %d not found' % rid)
def to_rid(self, uuid):
row = self.execute('SELECT rid FROM blob WHERE uuid = ?',
(uuid,)).fetchone()
if row:
return row[0]
else:
raise IndexError('uuid %s not found' % uuid)
def execute(self, sql, parameters=None):
return self.db.cursor().execute(sql, parameters)