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|
import io
import pytest
from falcon.errors import DelimiterError
from falcon.util import BufferedReader
class WouldHang(RuntimeError):
pass
class GlitchyStream(io.BytesIO):
def read(self, size=None):
if size is None or size == -1:
raise WouldHang('unbounded read()')
result = super().read(size)
if not result:
raise WouldHang('EOF')
return result
class FragmentedStream(GlitchyStream):
def read(self, size=None):
if size is None or size <= 1:
return super().read(size)
if size < 8:
size = 1
else:
size = size // 2
return super().read(size)
TEST_DATA = (
b'123456789ABCDEF\n' * 64 * 1024 * 64
+ b'--boundary1234567890--'
+ b'123456789ABCDEF\n' * 64 * 1024 * 63
+ b'--boundary1234567890--'
+ b'123456789ABCDEF\n' * 64 * 1024 * 62
+ b'--boundary1234567890--'
)
TEST_BYTES_IO = GlitchyStream(TEST_DATA)
@pytest.fixture()
def buffered_reader():
def _reader_fixture(chunk_size=None):
TEST_BYTES_IO.seek(0)
return BufferedReader(TEST_BYTES_IO.read, len(TEST_DATA), chunk_size)
yield _reader_fixture
@pytest.fixture()
def shorter_stream():
TEST_BYTES_IO.seek(0)
return BufferedReader(TEST_BYTES_IO.read, 1024, 128)
@pytest.fixture()
def fragmented_stream():
stream = FragmentedStream(TEST_DATA)
return BufferedReader(stream.read, len(TEST_DATA))
def test_peek(buffered_reader):
stream = buffered_reader(16)
assert stream.peek(0) == b''
assert stream.peek(1) == b'1'
assert stream.peek(2) == b'12'
assert stream.peek(16) == b'123456789ABCDEF\n'
assert stream.peek(17) == b'123456789ABCDEF\n'
assert stream.peek(32) == b'123456789ABCDEF\n'
assert stream.read(15) == b'123456789ABCDEF'
assert stream.peek(0) == b''
assert stream.peek(1) == b'\n'
assert stream.peek(2) == b'\n1'
assert stream.peek(16) == b'\n123456789ABCDEF'
assert stream.peek(17) == b'\n123456789ABCDEF'
assert stream.peek(32) == b'\n123456789ABCDEF'
def test_peek_eof():
source = b'Hello, world!\n'
source_stream = io.BytesIO(source)
stream = BufferedReader(source_stream.read, len(source) - 1)
assert stream.peek(0) == b''
assert stream.peek(1) == b'H'
assert stream.peek(2) == b'He'
assert stream.peek(16) == b'Hello, world!'
assert stream.peek(32) == b'Hello, world!'
assert source_stream.read() == b'\n'
def test_bounded_read():
stream = io.BytesIO(b'Hello, world!')
buffered = BufferedReader(stream.read, len('Hello, world'))
buffered.read()
assert stream.read() == b'!'
@pytest.mark.parametrize(
'size',
[
0,
1,
2,
7,
62,
63,
64,
65,
126,
127,
128,
129,
1000,
10000,
],
)
def test_read_from_buffer(buffered_reader, size):
stream = buffered_reader(64)
stream.peek(64)
assert stream.read(size) == TEST_DATA[:size]
assert stream.read(1) == TEST_DATA[size : size + 1]
def test_read_until_delimiter_size_check(buffered_reader):
stream = buffered_reader(64)
with pytest.raises(ValueError):
stream.read_until(b'')
with pytest.raises(ValueError):
stream.read_until(b'B' * 65)
@pytest.mark.parametrize(
'size',
[
0,
1,
2,
7,
62,
63,
64,
65,
126,
127,
128,
129,
1000,
10000,
],
)
def test_read_until_with_size(buffered_reader, size):
stream = buffered_reader(64)
assert stream.read_until(b'--boundary1234567890--', size) == (TEST_DATA[:size])
@pytest.mark.slow
def test_read_until(buffered_reader):
stream = buffered_reader()
assert len(stream.read_until(b'--boundary1234567890--')) == 64 * 1024**2
stream.read_until(b'123456789ABCDEF\n')
assert len(stream.read_until(b'--boundary1234567890--')) == 63 * 1024**2
stream.read_until(b'123456789ABCDEF\n')
assert len(stream.read_until(b'--boundary1234567890--')) == 62 * 1024**2
@pytest.mark.parametrize(
'size1,size2',
[
(11003077, 22000721),
(13372477, 51637898),
],
)
@pytest.mark.slow
def test_irregular_large_read_until(buffered_reader, size1, size2):
stream = buffered_reader()
delimiter = b'--boundary1234567890--'
stream.pipe_until(delimiter, consume_delimiter=True)
stream.pipe_until(delimiter, consume_delimiter=True)
expected = b'123456789ABCDEF\n' * 64 * 1024 * 62
assert stream.read_until(delimiter, 1337) == expected[:1337]
chunk1 = stream.read_until(delimiter, size1)
assert len(chunk1) == size1
chunk2 = stream.read_until(delimiter, size2)
assert len(chunk2) == size2
remainder = stream.read_until(delimiter, 62 * 1024 * 1024)
assert chunk1 + chunk2 + remainder == expected[1337:]
@pytest.mark.parametrize(
'size',
[
0,
1,
2,
7,
62,
63,
64,
65,
126,
127,
128,
129,
1000,
],
)
def test_read_until_from_buffer(shorter_stream, size):
shorter_stream.peek(128)
assert shorter_stream.read_until(b'\n1', size) == (b'123456789ABCDEF'[:size])
def test_read_until_missing_delimiter(shorter_stream):
class BoundaryMissing(RuntimeError):
pass
with pytest.raises(DelimiterError):
shorter_stream.read_until(b'--boundary1234567890--', consume_delimiter=True)
def test_consume_delimiter(shorter_stream):
shorter_stream.peek()
shorter_stream.read(113)
assert shorter_stream.peek(1) == b'2'
chunk = shorter_stream.read_until(b'1', 15, consume_delimiter=True)
assert chunk == b'23456789ABCDEF\n'
assert shorter_stream.read_until(b'ABCDE', 4) == b'2345'
@pytest.mark.parametrize('chunk_size', list(range(46, 63)))
def test_read_until_shared_boundary(chunk_size):
source = b'-boundary-like-' * 4 + b'--some junk--\n' + b'\n' * 1024
source_stream = io.BytesIO(source)
stream = BufferedReader(source_stream.read, len(source), chunk_size)
assert stream.read_until(b'-boundary-like---') == b'-boundary-like-' * 3
assert stream.peek(17) == b'-boundary-like---'
def test_pipe(shorter_stream):
output = io.BytesIO()
shorter_stream.pipe(output)
assert len(output.getvalue()) == 1024
def test_pipe_until(buffered_reader):
stream = buffered_reader(2**16)
output = io.BytesIO()
stream.pipe_until(b'--boundary1234567890--', output)
assert len(output.getvalue()) == 64 * 1024**2
def test_pipe_until_without_destination(buffered_reader):
stream = buffered_reader(2**16)
stream.pipe_until(b'--boundary1234567890--')
assert stream.peek(22) == b'--boundary1234567890--'
def test_exhaust(shorter_stream):
shorter_stream.exhaust()
assert not shorter_stream.read()
def test_readline():
source = (
b'Hello, world!\n'
b'A line.\n'
b'\n'
b'A longer line... \n' + b'SPAM ' * 7 + b'\n' + b'\n'
)
stream = BufferedReader(io.BytesIO(source).read, len(source))
assert stream.readline() == b'Hello, world!\n'
assert stream.readline() == b'A line.\n'
assert stream.readline() == b'\n'
assert stream.readline() == b'A longer line... \n'
assert stream.readline() == b'SPAM SPAM SPAM SPAM SPAM SPAM SPAM \n'
assert stream.readline() == b'\n'
assert stream.readline() == b''
assert stream.readline() == b''
def test_readline_with_size():
source = (
b'Hello, world! This is a short village name in Wales.\n'
b'Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch'
)
stream = BufferedReader(io.BytesIO(source).read, len(source))
assert stream.readline(37) == b'Hello, world! This is a short village'
assert stream.readline(37) == b' name in Wales.\n'
assert stream.readline(8) == b'Llanfair'
assert stream.readline(16) == b'pwllgwyngyllgoge'
assert stream.readline(64) == b'rychwyrndrobwllllantysiliogogogoch'
def test_readlines(shorter_stream):
assert shorter_stream.readlines() == [b'123456789ABCDEF\n'] * 64
@pytest.mark.parametrize(
'chunk_size',
[
8,
16,
256,
1024,
2**16,
],
)
def test_readlines_hint(buffered_reader, chunk_size):
stream = buffered_reader(chunk_size)
assert stream.readlines(100) == [b'123456789ABCDEF\n'] * 7
assert stream.readlines(64) == [b'123456789ABCDEF\n'] * 4
assert stream.readlines(16) == [b'123456789ABCDEF\n']
def test_duck_compatibility_with_io_base(shorter_stream):
assert shorter_stream.readable()
assert not shorter_stream.seekable()
assert not shorter_stream.writeable()
@pytest.mark.slow
def test_fragmented_reads(fragmented_stream):
b = io.BytesIO()
fragmented_stream.pipe_until(b'--boundary1234567890--', b)
assert fragmented_stream.read(2) == b'--'
fragmented_stream.pipe_until(b'--boundary1234567890--')
assert fragmented_stream.read(3) == b'--b'
fragmented_stream.pipe_until(b'--boundary1234567890--')
assert fragmented_stream.read(7) == b'--bound'
fragmented_stream.exhaust()
assert fragmented_stream.read(4) == b''
assert fragmented_stream.read() == b''
|
