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Copy pathtest_copilot_request_handler_response.py
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342 lines (276 loc) · 11 KB
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import asyncio
import base64
import httpx
import pytest
from copilot.copilot_request_handler import (
CopilotRequestContext,
CopilotRequestHandler,
_CopilotRequestAdapterHandler,
_CopilotRequestExchange,
_stream_response_to_exchange,
create_copilot_request_adapter,
)
from copilot.generated.rpc import (
LlmInferenceHTTPRequestChunkRequest,
LlmInferenceHTTPRequestStartRequest,
)
async def _wait_for(predicate, timeout: float = 2.0) -> None:
async with asyncio.timeout(timeout):
while not predicate():
await asyncio.sleep(0)
class _ControlledStream(httpx.AsyncByteStream):
def __init__(
self,
chunks: list[bytes],
*,
error: Exception | None = None,
block_after_chunks: bool = False,
) -> None:
self._chunks = chunks
self._error = error
self._block_after_chunks = block_after_chunks
self.read_count = 0
self.exhausted = asyncio.Event()
self.read_blocked = asyncio.Event()
self.read_cancelled = asyncio.Event()
self.closed = asyncio.Event()
async def __aiter__(self):
for chunk in self._chunks:
self.read_count += 1
yield chunk
self.exhausted.set()
if self._error is not None:
raise self._error
if self._block_after_chunks:
self.read_blocked.set()
try:
await asyncio.Event().wait()
except asyncio.CancelledError:
self.read_cancelled.set()
raise
async def aclose(self) -> None:
self.closed.set()
class _TaskAffineStream(httpx.AsyncByteStream):
def __init__(self) -> None:
self.owner: asyncio.Task[None] | None = None
self.closed = asyncio.Event()
async def __aiter__(self):
owner = asyncio.current_task()
self.owner = owner
yield b"first"
if asyncio.current_task() is not owner:
raise RuntimeError("response iterator resumed from a different task")
yield b"second"
async def aclose(self) -> None:
if self.closed.is_set():
return
if asyncio.current_task() is not self.owner:
raise RuntimeError("response stream closed from a different task")
self.closed.set()
class _BufferedTaskAffineStream(httpx.AsyncByteStream):
def __init__(self) -> None:
self.owner: asyncio.Task[None] | None = None
self.read_count = 0
self.closed = asyncio.Event()
async def __aiter__(self):
self.owner = asyncio.current_task()
while True:
self.read_count += 1
yield b"x" * 1024
async def aclose(self) -> None:
if self.closed.is_set():
return
if asyncio.current_task() is not self.owner:
raise RuntimeError("response stream closed from a different task")
self.closed.set()
class _WithheldAckRpc:
def __init__(self) -> None:
self.starts = []
self.chunks = []
self.acks: list[asyncio.Future[None]] = []
self.outstanding_data = 0
self.max_outstanding_data = 0
@property
def data_chunks(self):
return [chunk for chunk in self.chunks if not chunk.end]
async def http_response_start(self, params):
self.starts.append(params)
async def http_response_chunk(self, params):
self.chunks.append(params)
if params.end:
return
ack = asyncio.get_running_loop().create_future()
self.acks.append(ack)
self.outstanding_data += 1
self.max_outstanding_data = max(self.max_outstanding_data, self.outstanding_data)
try:
_ = await ack
finally:
self.outstanding_data -= 1
def acknowledge(self, index: int) -> None:
self.acks[index].set_result(None)
def reject(self, index: int, error: Exception) -> None:
self.acks[index].set_exception(error)
def _response(stream: httpx.AsyncByteStream) -> httpx.Response:
return httpx.Response(
200,
headers={"content-type": "application/octet-stream"},
stream=stream,
request=httpx.Request("GET", "https://example.test/response"),
)
async def _pump(response: httpx.Response, exchange: _CopilotRequestExchange) -> None:
try:
await _stream_response_to_exchange(response, exchange)
finally:
await response.aclose()
def _decoded_data(rpc: _WithheldAckRpc) -> list[bytes]:
return [base64.b64decode(chunk.data) for chunk in rpc.data_chunks]
@pytest.mark.asyncio
async def test_reads_ahead_and_coalesces_with_one_data_rpc_outstanding() -> None:
stream = _ControlledStream([b"x" * 1024] * 70)
response = _response(stream)
rpc = _WithheldAckRpc()
exchange = _CopilotRequestExchange("request", lambda: rpc)
pump = asyncio.create_task(_pump(response, exchange))
await _wait_for(lambda: len(rpc.data_chunks) == 1 and stream.read_count == 33)
assert _decoded_data(rpc) == [b"x" * 1024]
assert rpc.outstanding_data == 1
assert rpc.max_outstanding_data == 1
reads_at_capacity = stream.read_count
await asyncio.sleep(0.01)
assert stream.read_count == reads_at_capacity
assert len(rpc.data_chunks) == 1
rpc.acknowledge(0)
await _wait_for(lambda: len(rpc.data_chunks) == 2 and stream.read_count == 65)
assert len(_decoded_data(rpc)[1]) == 32 * 1024
assert rpc.max_outstanding_data == 1
rpc.acknowledge(1)
await _wait_for(lambda: len(rpc.data_chunks) == 3 and stream.exhausted.is_set())
assert len(_decoded_data(rpc)[2]) == 32 * 1024
rpc.acknowledge(2)
await _wait_for(lambda: len(rpc.data_chunks) == 4)
assert len(_decoded_data(rpc)[3]) == 5 * 1024
rpc.acknowledge(3)
await asyncio.wait_for(pump, timeout=2)
assert b"".join(_decoded_data(rpc)) == b"x" * (70 * 1024)
assert rpc.max_outstanding_data == 1
assert rpc.chunks[-1].end is True
assert rpc.chunks[-1].error is None
assert stream.closed.is_set()
@pytest.mark.asyncio
async def test_response_iterator_is_advanced_by_one_persistent_task() -> None:
stream = _TaskAffineStream()
response = _response(stream)
rpc = _WithheldAckRpc()
exchange = _CopilotRequestExchange("request", lambda: rpc)
pump = asyncio.create_task(_pump(response, exchange))
await _wait_for(lambda: len(rpc.data_chunks) == 1)
rpc.acknowledge(0)
await _wait_for(lambda: len(rpc.data_chunks) == 2)
rpc.acknowledge(1)
await asyncio.wait_for(pump, timeout=2)
assert b"".join(_decoded_data(rpc)) == b"firstsecond"
assert stream.closed.is_set()
@pytest.mark.asyncio
async def test_response_stream_is_closed_by_producer_when_read_ahead_is_full() -> None:
stream = _BufferedTaskAffineStream()
response = _response(stream)
rpc = _WithheldAckRpc()
exchange = _CopilotRequestExchange("request", lambda: rpc)
pump = asyncio.create_task(_pump(response, exchange))
await _wait_for(lambda: len(rpc.data_chunks) == 1 and stream.read_count == 33)
rpc.reject(0, ConnectionError("runtime connection lost"))
with pytest.raises(ConnectionError, match="runtime connection lost"):
await asyncio.wait_for(pump, timeout=2)
assert stream.closed.is_set()
class _ResponseHandler(CopilotRequestHandler):
def __init__(self, response: httpx.Response) -> None:
self._response = response
async def send_request(
self, request: httpx.Request, ctx: CopilotRequestContext
) -> httpx.Response:
return self._response
async def _start_adapter_request(
stream: _ControlledStream,
) -> tuple[_WithheldAckRpc, _CopilotRequestAdapterHandler, asyncio.Task[None]]:
rpc = _WithheldAckRpc()
adapter = create_copilot_request_adapter(_ResponseHandler(_response(stream)), lambda: rpc)
request_id = "request"
await adapter.http_request_start(
LlmInferenceHTTPRequestStartRequest(
headers={},
method="GET",
request_id=request_id,
url="https://example.test/response",
)
)
await adapter.http_request_chunk(
LlmInferenceHTTPRequestChunkRequest(data="", request_id=request_id, end=True)
)
exchange = adapter._pending[request_id]
assert exchange.task is not None
return rpc, adapter, exchange.task
@pytest.mark.asyncio
async def test_runtime_cancellation_stops_pending_read_and_closes_source() -> None:
stream = _ControlledStream([b"first"], block_after_chunks=True)
rpc, adapter, task = await _start_adapter_request(stream)
await asyncio.wait_for(stream.read_blocked.wait(), timeout=2)
await _wait_for(lambda: len(rpc.data_chunks) == 1)
await adapter.http_request_chunk(
LlmInferenceHTTPRequestChunkRequest(
data="",
request_id="request",
cancel=True,
cancel_reason="consumer stopped",
)
)
await asyncio.wait_for(task, timeout=2)
assert stream.read_cancelled.is_set()
assert stream.closed.is_set()
assert rpc.outstanding_data == 0
assert rpc.max_outstanding_data == 1
assert rpc.chunks[-1].end is True
assert rpc.chunks[-1].error.code == "cancelled"
@pytest.mark.asyncio
async def test_upstream_error_follows_all_buffered_bytes() -> None:
stream = _ControlledStream(
[b"first", b"partial"],
error=RuntimeError("synthetic upstream failure"),
)
rpc, _, task = await _start_adapter_request(stream)
await asyncio.wait_for(stream.exhausted.wait(), timeout=2)
await _wait_for(lambda: len(rpc.data_chunks) == 1)
rpc.acknowledge(0)
await _wait_for(lambda: len(rpc.data_chunks) == 2)
rpc.acknowledge(1)
await asyncio.wait_for(task, timeout=2)
assert _decoded_data(rpc) == [b"first", b"partial"]
assert rpc.chunks[-1].end is True
assert rpc.chunks[-1].error.message == "synthetic upstream failure"
assert stream.closed.is_set()
@pytest.mark.asyncio
async def test_rpc_rejection_stops_pending_read_and_closes_source() -> None:
stream = _ControlledStream([b"first"], block_after_chunks=True)
rpc, _, task = await _start_adapter_request(stream)
await asyncio.wait_for(stream.read_blocked.wait(), timeout=2)
await _wait_for(lambda: len(rpc.data_chunks) == 1)
rpc.reject(0, ConnectionError("runtime connection lost"))
await asyncio.wait_for(task, timeout=2)
assert stream.read_cancelled.is_set()
assert stream.closed.is_set()
assert rpc.outstanding_data == 0
assert rpc.max_outstanding_data == 1
assert rpc.chunks[-1].end is True
assert rpc.chunks[-1].error.message == "runtime connection lost"
@pytest.mark.asyncio
async def test_connection_loss_stops_idle_read_and_closes_source() -> None:
stream = _ControlledStream([], block_after_chunks=True)
rpc, adapter, task = await _start_adapter_request(stream)
await asyncio.wait_for(stream.read_blocked.wait(), timeout=2)
adapter.cancel_pending()
await asyncio.wait_for(task, timeout=2)
assert stream.read_cancelled.is_set()
assert stream.closed.is_set()
assert rpc.data_chunks == []
assert rpc.chunks[-1].end is True
assert rpc.chunks[-1].error.code == "cancelled"
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