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from __future__ import annotations
from collections import deque
from collections.abc import Iterable
from dataclasses import InitVar, dataclass, field
from typing import TypeVar
import pytest
from anyio import ClosedResourceError, EndOfStream
from anyio.abc import (
ByteReceiveStream,
ByteSendStream,
ObjectReceiveStream,
ObjectSendStream,
)
from anyio.streams.stapled import StapledByteStream, StapledObjectStream
@dataclass
class DummyByteReceiveStream(ByteReceiveStream):
data: InitVar[bytes]
buffer: bytearray = field(init=False)
_closed: bool = field(init=False, default=False)
def __post_init__(self, data: bytes) -> None:
self.buffer = bytearray(data)
async def receive(self, max_bytes: int = 65536) -> bytes:
if self._closed:
raise ClosedResourceError
data = bytes(self.buffer[:max_bytes])
del self.buffer[:max_bytes]
return data
async def aclose(self) -> None:
self._closed = True
@dataclass
class DummyByteSendStream(ByteSendStream):
buffer: bytearray = field(init=False, default_factory=bytearray)
_closed: bool = field(init=False, default=False)
async def send(self, item: bytes) -> None:
if self._closed:
raise ClosedResourceError
self.buffer.extend(item)
async def aclose(self) -> None:
self._closed = True
class TestStapledByteStream:
@pytest.fixture
def send_stream(self) -> DummyByteSendStream:
return DummyByteSendStream()
@pytest.fixture
def receive_stream(self) -> DummyByteReceiveStream:
return DummyByteReceiveStream(b"hello, world")
@pytest.fixture
def stapled(
self, send_stream: DummyByteSendStream, receive_stream: DummyByteReceiveStream
) -> StapledByteStream:
return StapledByteStream(send_stream, receive_stream)
async def test_receive_send(
self, stapled: StapledByteStream, send_stream: DummyByteSendStream
) -> None:
assert await stapled.receive(3) == b"hel"
assert await stapled.receive() == b"lo, world"
assert await stapled.receive() == b""
await stapled.send(b"how are you ")
await stapled.send(b"today?")
assert stapled.send_stream is send_stream
assert bytes(send_stream.buffer) == b"how are you today?"
async def test_send_eof(self, stapled: StapledByteStream) -> None:
await stapled.send_eof()
await stapled.send_eof()
with pytest.raises(ClosedResourceError):
await stapled.send(b"world")
assert await stapled.receive() == b"hello, world"
async def test_aclose(self, stapled: StapledByteStream) -> None:
await stapled.aclose()
with pytest.raises(ClosedResourceError):
await stapled.receive()
with pytest.raises(ClosedResourceError):
await stapled.send(b"")
T_Item = TypeVar("T_Item")
@dataclass
class DummyObjectReceiveStream(ObjectReceiveStream[T_Item]):
data: InitVar[Iterable[T_Item]]
buffer: deque[T_Item] = field(init=False)
_closed: bool = field(init=False, default=False)
def __post_init__(self, data: Iterable[T_Item]) -> None:
self.buffer = deque(data)
async def receive(self) -> T_Item:
if self._closed:
raise ClosedResourceError
if not self.buffer:
raise EndOfStream
return self.buffer.popleft()
async def aclose(self) -> None:
self._closed = True
@dataclass
class DummyObjectSendStream(ObjectSendStream[T_Item]):
buffer: list[T_Item] = field(init=False, default_factory=list)
_closed: bool = field(init=False, default=False)
async def send(self, item: T_Item) -> None:
if self._closed:
raise ClosedResourceError
self.buffer.append(item)
async def aclose(self) -> None:
self._closed = True
class TestStapledObjectStream:
@pytest.fixture
def receive_stream(self) -> DummyObjectReceiveStream[str]:
return DummyObjectReceiveStream(["hello", "world"])
@pytest.fixture
def send_stream(self) -> DummyObjectSendStream[str]:
return DummyObjectSendStream[str]()
@pytest.fixture
def stapled(
self,
receive_stream: DummyObjectReceiveStream[str],
send_stream: DummyObjectSendStream[str],
) -> StapledObjectStream[str]:
return StapledObjectStream(send_stream, receive_stream)
async def test_receive_send(
self, stapled: StapledObjectStream[str], send_stream: DummyObjectSendStream[str]
) -> None:
assert await stapled.receive() == "hello"
assert await stapled.receive() == "world"
with pytest.raises(EndOfStream):
await stapled.receive()
await stapled.send("how are you ")
await stapled.send("today?")
assert stapled.send_stream is send_stream
assert send_stream.buffer == ["how are you ", "today?"]
async def test_send_eof(self, stapled: StapledObjectStream[str]) -> None:
await stapled.send_eof()
await stapled.send_eof()
with pytest.raises(ClosedResourceError):
await stapled.send("world")
assert await stapled.receive() == "hello"
assert await stapled.receive() == "world"
async def test_aclose(self, stapled: StapledObjectStream[str]) -> None:
await stapled.aclose()
with pytest.raises(ClosedResourceError):
await stapled.receive()
with pytest.raises(ClosedResourceError):
await stapled.send(b"") # type: ignore[arg-type]
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