This repository was archived by the owner on Jul 26, 2026. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 68
Expand file tree
/
Copy pathtest_stream.py
More file actions
200 lines (166 loc) · 7.18 KB
/
Copy pathtest_stream.py
File metadata and controls
200 lines (166 loc) · 7.18 KB
1
2
3
4
5
6
7
8
9
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
36
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
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
# Copyright (C) 2010, 2011 Sebastian Thiel (byronimo@gmail.com) and contributors
#
# This module is part of GitDB and is released under
# the New BSD License: https://opensource.org/license/bsd-3-clause/
"""Test for object db"""
from gitdb.test.lib import (
TestBase,
DummyStream,
make_bytes,
make_object,
fixture_path
)
from gitdb import (
DecompressMemMapReader,
FDCompressedSha1Writer,
LooseObjectDB,
Sha1Writer,
MemoryDB,
IStream,
)
from gitdb.util import hex_to_bin
import zlib
from gitdb.typ import (
str_blob_type
)
import tempfile
import os
from io import BytesIO
class TestStream(TestBase):
"""Test stream classes"""
data_sizes = (15, 10000, 1000 * 1024 + 512)
def _assert_stream_reader(self, stream, cdata, rewind_stream=lambda s: None):
"""Make stream tests - the orig_stream is seekable, allowing it to be
rewound and reused
:param cdata: the data we expect to read from stream, the contents
:param rewind_stream: function called to rewind the stream to make it ready
for reuse"""
ns = 10
assert len(cdata) > ns - 1, "Data must be larger than %i, was %i" % (ns, len(cdata))
# read in small steps
ss = len(cdata) // ns
for i in range(ns):
data = stream.read(ss)
chunk = cdata[i * ss:(i + 1) * ss]
assert data == chunk
# END for each step
rest = stream.read()
if rest:
assert rest == cdata[-len(rest):]
# END handle rest
if isinstance(stream, DecompressMemMapReader):
assert len(stream.data()) == stream.compressed_bytes_read()
# END handle special type
rewind_stream(stream)
# read everything
rdata = stream.read()
assert rdata == cdata
if isinstance(stream, DecompressMemMapReader):
assert len(stream.data()) == stream.compressed_bytes_read()
# END handle special type
def test_decompress_reader(self):
for close_on_deletion in range(2):
for with_size in range(2):
for ds in self.data_sizes:
cdata = make_bytes(ds, randomize=False)
# zdata = zipped actual data
# cdata = original content data
# create reader
if with_size:
# need object data
zdata = zlib.compress(make_object(str_blob_type, cdata))
typ, size, reader = DecompressMemMapReader.new(zdata, close_on_deletion)
assert size == len(cdata)
assert typ == str_blob_type
# even if we don't set the size, it will be set automatically on first read
test_reader = DecompressMemMapReader(zdata, close_on_deletion=False)
assert test_reader._s == len(cdata)
else:
# here we need content data
zdata = zlib.compress(cdata)
reader = DecompressMemMapReader(zdata, close_on_deletion, len(cdata))
assert reader._s == len(cdata)
# END get reader
self._assert_stream_reader(reader, cdata, lambda r: r.seek(0))
# put in a dummy stream for closing
dummy = DummyStream()
reader._m = dummy
assert not dummy.closed
del(reader)
assert dummy.closed == close_on_deletion
# END for each datasize
# END whether size should be used
# END whether stream should be closed when deleted
def test_sha_writer(self):
writer = Sha1Writer()
assert 2 == writer.write(b"hi")
assert len(writer.sha(as_hex=1)) == 40
assert len(writer.sha(as_hex=0)) == 20
# make sure it does something ;)
prev_sha = writer.sha()
writer.write(b"hi again")
assert writer.sha() != prev_sha
def test_compressed_writer(self):
for ds in self.data_sizes:
fd, path = tempfile.mkstemp()
ostream = FDCompressedSha1Writer(fd)
data = make_bytes(ds, randomize=False)
# for now, just a single write, code doesn't care about chunking
assert len(data) == ostream.write(data)
ostream.close()
# its closed already
self.assertRaises(OSError, os.close, fd)
# read everything back, compare to data we zip
fd = os.open(path, os.O_RDONLY | getattr(os, 'O_BINARY', 0))
written_data = os.read(fd, os.path.getsize(path))
assert len(written_data) == os.path.getsize(path)
os.close(fd)
assert written_data == zlib.compress(data, 1) # best speed
os.remove(path)
# END for each os
def test_decompress_reader_special_case(self):
odb = LooseObjectDB(fixture_path('objects'))
mdb = MemoryDB()
for sha in (b'888401851f15db0eed60eb1bc29dec5ddcace911',
b'7bb839852ed5e3a069966281bb08d50012fb309b',):
ostream = odb.stream(hex_to_bin(sha))
# if there is a bug, we will be missing one byte exactly !
data = ostream.read()
assert len(data) == ostream.size
# Putting it back in should yield nothing new - after all, we have
dump = mdb.store(IStream(ostream.type, ostream.size, BytesIO(data)))
assert dump.hexsha == sha
# end for each loose object sha to test
def test_decompress_reader_chunked_read_does_not_terminate_early(self):
"""Regression test for #120: read(N) must not return b'' before EOF.
zlib can consume input without producing decompressed output (e.g.
while ingesting block headers). The reader's internal recursion
previously bailed on any empty zip output, so a caller reading in
small chunks via the standard `while chunk := stream.read(N)` idiom
would terminate at the first empty chunk -- before the actual end
of the uncompressed stream.
"""
# Highly compressible data exposes the bug because each zlib chunk
# spans many uncompressed bytes -- intermediate decompress() calls
# often return empty while consuming input.
data = b"hello world! " * 1000
zdata = zlib.compress(data)
# Loop with a small chunk size to force many internal read/decompression
# iterations before EOF.
for chunk_size in (1, 4, 16, 64):
reader = DecompressMemMapReader(
zdata, close_on_deletion=False, size=len(data)
)
out = bytearray()
while True:
chunk = reader.read(chunk_size)
if not chunk:
break
out.extend(chunk)
assert bytes(out) == data, (
f"chunk_size={chunk_size}: got {len(out)}/{len(data)} bytes"
)
assert reader._br == reader._s, (
f"chunk_size={chunk_size}: stream stopped at "
f"{reader._br}/{reader._s}"
)