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|
# SPDX-License-Identifier: MIT
from __future__ import annotations
import pickle
from random import randint
from typing import Any, Callable
import pytest
from mbedtls._ringbuf import RingBuffer # type: ignore
@pytest.fixture
def randomize_start(
randbytes: Callable[[int], bytes]
) -> Callable[[bytes], None]:
def impl(buffer: RingBuffer) -> None:
# Randomize start of the buffer.
size = randint(0, buffer.maxlen)
buffer.write(randbytes(size))
consumed = buffer.consume(size)
assert buffer.empty()
assert consumed == size
return impl
class TestRingBuf:
@pytest.fixture(params=[2000, 16384])
def maxlen(self, request: Any) -> int:
assert isinstance(request.param, int)
return request.param
def test_initial_conditions(self, maxlen: int) -> None:
buffer = RingBuffer(maxlen)
assert not buffer
assert len(buffer) == 0
assert buffer.maxlen == maxlen
assert buffer.empty()
assert not buffer.full()
assert buffer == b""
def test_clear(
self,
maxlen: int,
randomize_start: Callable[[bytes], None],
randbytes: Callable[[int], bytes],
) -> None:
buffer = RingBuffer(maxlen)
randomize_start(buffer)
data = randbytes(maxlen)
written = buffer.write(data)
buffer.clear()
assert written == maxlen
assert not buffer
assert len(buffer) == 0
assert buffer.maxlen == maxlen
assert buffer.empty()
assert not buffer.full()
assert buffer == b""
def test_write_empty(
self, maxlen: int, randomize_start: Callable[[bytes], None]
) -> None:
buffer = RingBuffer(maxlen)
randomize_start(buffer)
written = buffer.write(b"")
assert not written
assert not buffer
assert len(buffer) == 0
assert buffer.empty()
assert not buffer.full()
assert buffer == b""
def test_pickle(
self,
maxlen: int,
randomize_start: Callable[[bytes], None],
randbytes: Callable[[int], bytes],
) -> None:
buffer = RingBuffer(maxlen)
randomize_start(buffer)
data = randbytes(maxlen // 2)
assert buffer.write(data) == len(data)
other = pickle.loads(pickle.dumps(buffer))
assert other
assert other == buffer
def test_consume_zero(
self,
maxlen: int,
randomize_start: Callable[[bytes], None],
randbytes: Callable[[int], bytes],
) -> None:
buffer = RingBuffer(maxlen)
randomize_start(buffer)
data = randbytes(maxlen)
assert buffer.write(data) == len(data)
buffer.consume(0)
assert buffer.full()
assert buffer == data
def test_peek_zero(
self,
maxlen: int,
randomize_start: Callable[[bytes], None],
randbytes: Callable[[int], bytes],
) -> None:
buffer = RingBuffer(maxlen)
randomize_start(buffer)
data = randbytes(maxlen)
assert buffer.write(data) == len(data)
peeked = buffer.peek(0)
assert peeked == b""
assert buffer.full()
assert buffer == data
def test_read_zero(
self,
maxlen: int,
randomize_start: Callable[[bytes], None],
randbytes: Callable[[int], bytes],
) -> None:
buffer = RingBuffer(maxlen)
randomize_start(buffer)
data = randbytes(maxlen)
written = buffer.write(data)
assert written == maxlen
assert buffer.read(0) == b""
def test_write_full(
self,
maxlen: int,
randomize_start: Callable[[bytes], None],
randbytes: Callable[[int], bytes],
) -> None:
buffer = RingBuffer(maxlen)
randomize_start(buffer)
data = randbytes(maxlen)
written = buffer.write(data)
assert written == maxlen
assert buffer
assert len(buffer) == maxlen
assert buffer.maxlen == maxlen
assert not buffer.empty()
assert buffer.full()
assert buffer == data
@pytest.mark.parametrize(
"chunk_size", [10, 100, 1000, 1997, 1998, 1999, 2000]
)
def test_write_chunks(
self,
maxlen: int,
chunk_size: int,
randomize_start: Callable[[bytes], None],
randbytes: Callable[[int], bytes],
) -> None:
buffer = RingBuffer(maxlen)
randomize_start(buffer)
data = randbytes(maxlen)
written = 0
for index in range(0, maxlen, chunk_size):
written += buffer.write(data[index : index + chunk_size])
assert written == maxlen
assert buffer.full()
assert buffer == data
@pytest.mark.parametrize(
"chunk_size", [10, 100, 1000, 1997, 1998, 1999, 2000]
)
def test_peek(
self,
maxlen: int,
chunk_size: int,
randomize_start: Callable[[bytes], None],
randbytes: Callable[[int], bytes],
) -> None:
buffer = RingBuffer(maxlen)
randomize_start(buffer)
data = randbytes(maxlen)
written = buffer.write(data)
for index in range(0, maxlen, chunk_size):
assert buffer.peek(index) == data[0:index]
assert written == maxlen
assert buffer == data
@pytest.mark.parametrize(
"chunk_size", [10, 100, 1000, 1997, 1998, 1999, 2000]
)
def test_read_chunks(
self,
maxlen: int,
chunk_size: int,
randomize_start: Callable[[bytes], None],
randbytes: Callable[[int], bytes],
) -> None:
buffer = RingBuffer(maxlen)
randomize_start(buffer)
data = randbytes(maxlen)
written = buffer.write(data)
for index in range(0, maxlen, chunk_size):
assert len(buffer) == maxlen - index
assert buffer.read(chunk_size) == data[index : index + chunk_size]
assert written == maxlen
assert buffer.empty()
@pytest.mark.parametrize(
"chunk_size", [10, 100, 1000, 1997, 1998, 1999, 2000]
)
def test_read_write_with_wraparound(
self,
maxlen: int,
chunk_size: int,
randomize_start: Callable[[bytes], None],
randbytes: Callable[[int], bytes],
) -> None:
buffer = RingBuffer(maxlen)
randomize_start(buffer)
wraparound = 5
written = 0
for _ in range(wraparound * maxlen // chunk_size):
data = randbytes(chunk_size)
written += buffer.write(data)
assert buffer.read(chunk_size) == data
assert buffer.empty()
assert written >= maxlen * (wraparound - 1)
def test_read_write_with_wraparound_long(
self,
maxlen: int,
randomize_start: Callable[[bytes], None],
randbytes: Callable[[int], bytes],
) -> None:
buffer = RingBuffer(maxlen)
randomize_start(buffer)
size = randint(2, 42) * maxlen
step = randint(1, maxlen)
written = 0
for _ in range(0, size, step):
data = randbytes(step)
amt = buffer.write(data)
written += amt
assert amt == step
assert amt == len(data)
assert written % step == 0
assert buffer.read(len(data)) == data
assert buffer.empty()
def test_write_overflow_raises_buffererror(
self,
maxlen: int,
randomize_start: Callable[[bytes], None],
randbytes: Callable[[int], bytes],
) -> None:
buffer = RingBuffer(maxlen)
randomize_start(buffer)
data = randbytes(maxlen + 1)
with pytest.raises(BufferError):
buffer.write(data)
assert not buffer
|
