292 lines
11 KiB
Python
292 lines
11 KiB
Python
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"""通过真实 ChatOpenAI/OpenAI SDK + HTTP mock 验证迁移边界。"""
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import asyncio
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import json
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from contextlib import aclosing
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from typing import TypedDict
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from unittest.mock import AsyncMock
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import httpx
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import pytest
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from langchain_core.callbacks import AsyncCallbackHandler
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from langchain_core.messages import AIMessage
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from langgraph.graph import END, START, StateGraph
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from src.agent.llm import LLMAPIError, LLMTimeoutError, OpenAILLMService
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from src.core.config import Config
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def _chunk(text):
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data = {
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'id': 'response', 'object': 'chat.completion.chunk', 'created': 0, 'model': 'probe',
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'choices': [{'index': 0, 'delta': {'content': text}, 'finish_reason': None}],
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}
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return ('data: ' + json.dumps(data) + '\n\n').encode()
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def _response(text, *, stream=False):
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if stream:
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return httpx.Response(200, headers={'content-type': 'text/event-stream'},
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content=_chunk(text) + b'data: [DONE]\n\n')
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return httpx.Response(200, json={
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'id': 'response', 'object': 'chat.completion', 'created': 0, 'model': 'probe',
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'choices': [{'index': 0, 'message': {'role': 'assistant', 'content': text},
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'finish_reason': 'stop'}],
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'usage': {'prompt_tokens': 7, 'completion_tokens': 2, 'total_tokens': 9},
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})
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def _service(monkeypatch, handler, **kwargs):
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monkeypatch.setattr(Config, 'LLM_HTTP_TRUST_ENV', False)
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service = OpenAILLMService(
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model='probe', api_key='offline-test', base_url='http://probe.local/v1',
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extra_body={'reasoning_effort': 'none'}, **kwargs,
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)
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# 只替换 HTTP 传输，模型工厂、消息转换、callbacks 和 SDK 全部真实执行。
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model = service._get_client()
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model.http_async_client._transport = httpx.MockTransport(handler)
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return service
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@pytest.mark.asyncio
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@pytest.mark.parametrize('stream', [False, True])
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@pytest.mark.parametrize('temperature', [None, 0.0])
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async def test_wire_contract_preserves_profile_messages_and_chat_completions(monkeypatch, stream, temperature):
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monkeypatch.setenv('OPENAI_PROXY', 'http://invalid-proxy.local:1')
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monkeypatch.setenv('HTTP_PROXY', 'http://invalid-proxy.local:1')
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monkeypatch.setenv('HTTPS_PROXY', 'http://invalid-proxy.local:1')
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requests = []
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def handler(request):
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requests.append(request)
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return _response('收到', stream=stream)
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llm = _service(monkeypatch, handler, temperature=temperature)
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http_async = llm._client.http_async_client
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http_sync = llm._client.http_client
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history = [{'role': 'user', 'content': '之前的输入'}, {'role': 'assistant', 'content': '之前的回复'}]
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try:
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if stream:
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result = ''.join([t async for t in llm.stream_tokens('系统', '本轮', history=history)])
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else:
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result = await llm.complete('系统', '本轮', history=history)
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assert result == '收到'
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assert len(requests) == 1
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request = requests[0]
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payload = json.loads(request.content)
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assert request.url.path == '/v1/chat/completions'
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assert payload['model'] == 'probe'
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assert payload['reasoning_effort'] == 'none'
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assert payload['stream'] is stream
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assert 'stream_options' not in payload
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if temperature is None:
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assert 'temperature' not in payload
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else:
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assert payload['temperature'] == temperature
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assert payload['messages'] == [
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{'role': 'system', 'content': '系统'}, *history, {'role': 'user', 'content': '本轮'},
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]
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assert history == [{'role': 'user', 'content': '之前的输入'}, {'role': 'assistant', 'content': '之前的回复'}]
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finally:
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await llm.aclose()
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assert http_async.is_closed and http_sync.is_closed
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assert llm._client is None
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await llm.aclose()
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class TrackingBody(httpx.AsyncByteStream):
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def __init__(self, text='partial', *, fail=False, emit=True):
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self.text = text
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self.fail = fail
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self.emit = emit
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self.closed = False
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self.started = asyncio.Event()
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self.release = asyncio.Event()
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async def __aiter__(self):
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self.started.set()
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if self.emit:
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yield _chunk(self.text)
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if self.fail:
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raise httpx.ReadError('broken transport')
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await self.release.wait()
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yield _chunk('tail')
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yield b'data: [DONE]\n\n'
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async def aclose(self):
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self.closed = True
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def _stream_response(body):
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return httpx.Response(200, headers={'content-type': 'text/event-stream'}, stream=body)
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@pytest.mark.asyncio
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async def test_early_close_is_immediate_and_does_not_close_another_session(monkeypatch):
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bodies = {}
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def handler(request):
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text = json.loads(request.content)['messages'][-1]['content']
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body = bodies[text] = TrackingBody(text)
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return _stream_response(body)
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llm = _service(monkeypatch, handler)
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first = llm.stream_tokens('system', 'first')
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second = llm.stream_tokens('system', 'second')
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try:
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# anext 运行在其他任务中，aclose 在当前任务中；上下文也必须安全复原。
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assert await asyncio.wait_for(anext(first), 5) == 'first'
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assert await asyncio.wait_for(anext(second), 5) == 'second'
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await first.aclose()
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assert bodies['first'].closed
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assert not bodies['second'].closed
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bodies['second'].release.set()
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assert [t async for t in second] == ['tail']
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assert bodies['second'].closed
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finally:
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await first.aclose()
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await second.aclose()
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await llm.aclose()
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@pytest.mark.asyncio
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async def test_transport_failure_after_text_closes_immediately_without_retry(monkeypatch):
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body = TrackingBody(fail=True)
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calls = []
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def handler(request):
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calls.append(request)
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return _stream_response(body)
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llm = _service(monkeypatch, handler)
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llm._retry_delay = AsyncMock()
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tokens = []
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try:
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with pytest.raises(LLMAPIError):
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async for token in llm.stream_tokens('system', 'user'):
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tokens.append(token)
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assert tokens == ['partial']
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assert body.closed
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assert len(calls) == 1
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llm._retry_delay.assert_not_awaited()
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finally:
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await llm.aclose()
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@pytest.mark.asyncio
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async def test_stream_cancellation_closes_http_response_before_returning(monkeypatch):
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body = TrackingBody(emit=False)
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llm = _service(monkeypatch, lambda request: _stream_response(body))
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llm._retry_delay = AsyncMock()
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async def consume():
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async with aclosing(llm.stream_tokens('system', 'user')) as stream:
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async for _ in stream:
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pass
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task = asyncio.create_task(consume())
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try:
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await asyncio.wait_for(body.started.wait(), 5)
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task.cancel()
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with pytest.raises(asyncio.CancelledError):
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await task
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assert body.closed
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llm._retry_delay.assert_not_awaited()
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finally:
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task.cancel()
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await asyncio.gather(task, return_exceptions=True)
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await llm.aclose()
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@pytest.mark.asyncio
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async def test_stream_timeout_closes_each_attempt_before_retry(monkeypatch):
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bodies = []
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def handler(request):
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assert all(body.closed for body in bodies)
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body = TrackingBody(emit=False)
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bodies.append(body)
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return _stream_response(body)
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llm = _service(monkeypatch, handler, timeout_seconds=0.1, max_retries=2)
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llm._retry_delay = AsyncMock()
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try:
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with pytest.raises(LLMTimeoutError):
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async for _ in llm.stream_tokens('system', 'user'):
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pass
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assert len(bodies) == 3
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assert all(body.closed for body in bodies)
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assert llm._retry_delay.await_count == 2
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finally:
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await llm.aclose()
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class TraceRecorder(AsyncCallbackHandler):
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def __init__(self):
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self.chains = {}
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self.models = []
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self.results = []
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async def on_chain_start(self, serialized, inputs, *, run_id, **kwargs):
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self.chains[run_id] = kwargs.get('name')
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async def on_chat_model_start(self, serialized, messages, *, run_id, **kwargs):
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self.models.append({'run_id': run_id, **kwargs})
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async def on_llm_end(self, response, **kwargs):
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self.results.append(response)
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@pytest.mark.asyncio
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@pytest.mark.parametrize('stream', [False, True])
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async def test_model_callbacks_inherit_graph_parent_metadata_and_tags(monkeypatch, stream):
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llm = _service(monkeypatch, lambda request: _response('ok', stream=stream))
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recorder = TraceRecorder()
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class State(TypedDict):
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text: str
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async def dialogue(state):
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if stream:
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text = ''.join([t async for t in llm.stream_tokens('system', state['text'])])
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else:
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text = await llm.complete('system', state['text'])
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return {'text': text}
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graph = StateGraph(State)
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graph.add_node('dialogue', dialogue)
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graph.add_edge(START, 'dialogue')
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graph.add_edge('dialogue', END)
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try:
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result = await graph.compile().ainvoke({'text': 'hello'}, config={
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'callbacks': [recorder], 'metadata': {'session_id': 'trace-session'}, 'tags': ['probe'],
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})
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assert result['text'] == 'ok'
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assert len(recorder.models) == 1
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model = recorder.models[0]
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assert recorder.chains[model['parent_run_id']] == 'dialogue'
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assert model['name'] == ('llm.stream' if stream else 'llm.complete')
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assert model['metadata']['session_id'] == 'trace-session'
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assert model['metadata']['llm_attempt'] == 1
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assert 'probe' in model['tags']
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assert len(recorder.results) == 1
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if not stream:
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usage = recorder.results[0].generations[0][0].message.usage_metadata
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assert usage['input_tokens'] == 7 and usage['output_tokens'] == 2
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finally:
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await llm.aclose()
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@pytest.mark.parametrize('content, expected', [
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('正文', '正文'),
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([{'type': 'reasoning', 'reasoning': '内部内容'}, {'type': 'text', 'text': '正文'}], '正文'),
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([{'type': 'reasoning', 'reasoning': '内部内容'}], ''),
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])
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def test_only_text_content_is_forwarded(content, expected):
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assert OpenAILLMService._text(AIMessage(content=content)) == expected
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@pytest.mark.asyncio
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async def test_shared_model_serves_concurrent_calls_without_mixing_messages(monkeypatch):
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async def handler(request):
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payload = json.loads(request.content)
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await asyncio.sleep(0)
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return _response(payload['messages'][-1]['content'], stream=payload['stream'])
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llm = _service(monkeypatch, handler)
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async def request(index):
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text = f'input-{index}'
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if index % 2:
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return ''.join([t async for t in llm.stream_tokens('system', text)])
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return await llm.complete('system', text)
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try:
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assert await asyncio.gather(*(request(i) for i in range(12))) == [f'input-{i}' for i in range(12)]
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finally:
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await llm.aclose()
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