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"""PEP 0492/Python 3.5+ tests for binary files."""
import io
from os.path import dirname, join
import pytest
from aiofiles.threadpool import open as aioopen
@pytest.mark.parametrize("mode", ["rb", "rb+", "ab+"])
@pytest.mark.parametrize("buffering", [-1, 0])
async def test_simple_iteration(mode, buffering):
"""Test iterating over lines from a file."""
filename = join(dirname(__file__), "..", "resources", "multiline_file.txt")
async with aioopen(filename, mode=mode, buffering=buffering) as file:
# Append mode needs us to seek.
await file.seek(0)
counter = 1
# The old iteration pattern:
while True:
line = await file.readline()
if not line:
break
assert line.strip() == b"line " + str(counter).encode()
counter += 1
counter = 1
await file.seek(0)
# The new iteration pattern:
async for line in file:
assert line.strip() == b"line " + str(counter).encode()
counter += 1
assert file.closed
@pytest.mark.parametrize("mode", ["rb", "rb+", "ab+"])
@pytest.mark.parametrize("buffering", [-1, 0])
async def test_simple_readlines(mode, buffering):
"""Test the readlines functionality."""
filename = join(dirname(__file__), "..", "resources", "multiline_file.txt")
with open(filename, mode="rb") as f:
expected = f.readlines()
async with aioopen(str(filename), mode=mode) as file:
# Append mode needs us to seek.
await file.seek(0)
actual = await file.readlines()
assert actual == expected
@pytest.mark.parametrize("mode", ["rb+", "wb", "ab"])
@pytest.mark.parametrize("buffering", [-1, 0])
async def test_simple_flush(mode, buffering, tmpdir):
"""Test flushing to a file."""
filename = "file.bin"
full_file = tmpdir.join(filename)
if "r" in mode:
full_file.ensure() # Read modes want it to already exist.
async with aioopen(str(full_file), mode=mode, buffering=buffering) as file:
await file.write(b"0") # Shouldn't flush.
if buffering == -1:
assert b"" == full_file.read_binary()
else:
assert b"0" == full_file.read_binary()
await file.flush()
assert b"0" == full_file.read_binary()
@pytest.mark.parametrize("mode", ["rb+", "wb+", "ab+"])
async def test_simple_peek(mode, tmpdir):
"""Test flushing to a file."""
filename = "file.bin"
full_file = tmpdir.join(filename)
full_file.write_binary(b"0123456789")
async with aioopen(str(full_file), mode=mode) as file:
if "a" in mode:
await file.seek(0) # Rewind for append modes.
peeked = await file.peek(1)
# Technically it's OK for the peek to return less bytes than requested.
if peeked:
assert peeked.startswith(b"0")
read = await file.read(1)
assert peeked.startswith(read)
@pytest.mark.parametrize("mode", ["rb", "rb+", "ab+"])
@pytest.mark.parametrize("buffering", [-1, 0])
async def test_simple_read(mode, buffering):
"""Just read some bytes from a test file."""
filename = join(dirname(__file__), "..", "resources", "multiline_file.txt")
async with aioopen(filename, mode=mode, buffering=buffering) as file:
await file.seek(0) # Needed for the append mode.
actual = await file.read()
assert b"" == (await file.read())
assert actual == open(filename, mode="rb").read()
@pytest.mark.parametrize("mode", ["rb", "rb+", "ab+"])
@pytest.mark.parametrize("buffering", [-1, 0])
async def test_staggered_read(mode, buffering):
"""Read bytes repeatedly."""
filename = join(dirname(__file__), "..", "resources", "multiline_file.txt")
async with aioopen(filename, mode=mode, buffering=buffering) as file:
await file.seek(0) # Needed for the append mode.
actual = []
while True:
byte = await file.read(1)
if byte:
actual.append(byte)
else:
break
assert b"" == (await file.read())
expected = []
with open(filename, mode="rb") as f:
while True:
byte = f.read(1)
if byte:
expected.append(byte)
else:
break
assert actual == expected
@pytest.mark.parametrize("mode", ["rb", "rb+", "ab+"])
@pytest.mark.parametrize("buffering", [-1, 0])
async def test_simple_seek(mode, buffering, tmpdir):
"""Test seeking and then reading."""
filename = "bigfile.bin"
content = b"0123456789" * 4 * io.DEFAULT_BUFFER_SIZE
full_file = tmpdir.join(filename)
full_file.write_binary(content)
async with aioopen(str(full_file), mode=mode, buffering=buffering) as file:
await file.seek(4)
assert b"4" == (await file.read(1))
@pytest.mark.parametrize("mode", ["wb", "rb", "rb+", "wb+", "ab", "ab+"])
@pytest.mark.parametrize("buffering", [-1, 0])
async def test_simple_close_ctx_mgr_iter(mode, buffering, tmpdir):
"""Open a file, read a byte, and close it."""
filename = "bigfile.bin"
content = b"0" * 4 * io.DEFAULT_BUFFER_SIZE
full_file = tmpdir.join(filename)
full_file.write_binary(content)
async with aioopen(str(full_file), mode=mode, buffering=buffering) as file:
assert not file.closed
assert not file._file.closed
assert file.closed
assert file._file.closed
@pytest.mark.parametrize("mode", ["wb", "rb", "rb+", "wb+", "ab", "ab+"])
@pytest.mark.parametrize("buffering", [-1, 0])
async def test_simple_close_ctx_mgr(mode, buffering, tmpdir):
"""Open a file, read a byte, and close it."""
filename = "bigfile.bin"
content = b"0" * 4 * io.DEFAULT_BUFFER_SIZE
full_file = tmpdir.join(filename)
full_file.write_binary(content)
file = await aioopen(str(full_file), mode=mode, buffering=buffering)
assert not file.closed
assert not file._file.closed
await file.close()
assert file.closed
assert file._file.closed
@pytest.mark.parametrize("mode", ["rb", "rb+", "ab+"])
@pytest.mark.parametrize("buffering", [-1, 0])
async def test_simple_readinto(mode, buffering):
"""Test the readinto functionality."""
filename = join(dirname(__file__), "..", "resources", "multiline_file.txt")
async with aioopen(filename, mode=mode, buffering=buffering) as file:
await file.seek(0) # Needed for the append mode.
array = bytearray(4)
bytes_read = await file.readinto(array)
assert bytes_read == 4
assert array == open(filename, mode="rb").read(4)
@pytest.mark.parametrize("mode", ["rb+", "wb", "ab+"])
@pytest.mark.parametrize("buffering", [-1, 0])
async def test_simple_truncate(mode, buffering, tmpdir):
"""Test truncating files."""
filename = "bigfile.bin"
content = b"0123456789" * 4 * io.DEFAULT_BUFFER_SIZE
full_file = tmpdir.join(filename)
full_file.write_binary(content)
async with aioopen(str(full_file), mode=mode, buffering=buffering) as file:
# The append modes want us to seek first.
await file.seek(0)
if "w" in mode:
# We've just erased the entire file.
await file.write(content)
await file.flush()
await file.seek(0)
await file.truncate()
assert b"" == full_file.read_binary()
@pytest.mark.parametrize("mode", ["wb", "rb+", "wb+", "ab", "ab+"])
@pytest.mark.parametrize("buffering", [-1, 0])
async def test_simple_write(mode, buffering, tmpdir):
"""Test writing into a file."""
filename = "bigfile.bin"
content = b"0" * 4 * io.DEFAULT_BUFFER_SIZE
full_file = tmpdir.join(filename)
if "r" in mode:
full_file.ensure() # Read modes want it to already exist.
async with aioopen(str(full_file), mode=mode, buffering=buffering) as file:
bytes_written = await file.write(content)
assert bytes_written == len(content)
assert content == full_file.read_binary()
async def test_simple_detach(tmpdir):
"""Test detaching for buffered streams."""
filename = "file.bin"
full_file = tmpdir.join(filename)
full_file.write_binary(b"0123456789")
with pytest.raises(ValueError):
async with aioopen(str(full_file), mode="rb") as file:
raw_file = file.detach()
assert raw_file
with pytest.raises(ValueError):
await file.read()
assert b"0123456789" == raw_file.read(10)
async def test_simple_readall(tmpdir):
"""Test the readall function by reading a large file in.
Only RawIOBase supports readall().
"""
filename = "bigfile.bin"
content = b"0" * 4 * io.DEFAULT_BUFFER_SIZE # Hopefully several reads.
sync_file = tmpdir.join(filename)
sync_file.write_binary(content)
file = await aioopen(str(sync_file), mode="rb", buffering=0)
actual = await file.readall()
assert actual == content
await file.close()
assert file.closed
@pytest.mark.parametrize("mode", ["rb", "rb+", "ab+"])
@pytest.mark.parametrize("buffering", [-1, 0])
async def test_name_property(mode, buffering):
"""Test iterating over lines from a file."""
filename = join(dirname(__file__), "..", "resources", "multiline_file.txt")
async with aioopen(filename, mode=mode, buffering=buffering) as file:
assert file.name == filename
assert file.closed
@pytest.mark.parametrize("mode", ["rb", "rb+", "ab+"])
@pytest.mark.parametrize("buffering", [-1, 0])
async def test_mode_property(mode, buffering):
"""Test iterating over lines from a file."""
filename = join(dirname(__file__), "..", "resources", "multiline_file.txt")
async with aioopen(filename, mode=mode, buffering=buffering) as file:
assert file.mode == mode
assert file.closed
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