139 lines
5.9 KiB
Python
139 lines
5.9 KiB
Python
from collections.abc import AsyncIterator
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from dataclasses import asdict
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from fastapi import APIRouter, Depends, Request, status
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from sqlalchemy.ext.asyncio import AsyncSession
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from starlette.responses import StreamingResponse
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from app.api.dependencies.auth import build_request_context
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from app.api.dependencies.database import get_session
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from app.api.dependencies.rate_limit import enforce_rate_limit
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from app.api.schemas.agent_runs import (
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AgentRunAcceptedEnvelope,
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AgentRunAcceptedResponse,
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AgentRunCreateRequest,
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AgentRunStatusEnvelope,
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AgentRunStatusResponse,
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)
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from app.api.views.agent_run_sse import encode_events, recovery_events
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from app.core.config import get_settings
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from app.core.contracts import AgentRequest, RequestContext
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from app.core.errors import SseNotAcceptableError
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from app.service.agent_run_application_service import AgentRunApplicationService
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from app.service.run_query_service import RunQueryService
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router = APIRouter(prefix="/api/v1/agent-runs", tags=["agent-runs"],
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dependencies=[Depends(enforce_rate_limit)])
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SSE_MEDIA_TYPE = "text/event-stream"
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def accepts_event_stream(accept: str | None) -> bool:
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"""`Accept` 是否接受 `text/event-stream`（文档 §3.2：该头**非必填**）。
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- 未携带（`None` 或空串）→ 放行：文档写明"默认 `application/json`；SSE 为
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`text/event-stream`"，即由接口自身决定响应类型，不是客户端错误；
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- 携带 `text/event-stream`、`text/*` 或 `*/*` 且 `q != 0` → 放行；
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- 显式携带但只接受其他类型（如 `application/json`）→ 拒绝，由调用方转
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`406 SSE_NOT_ACCEPTABLE`（文档 §3.5/§6.4）。
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只做"是否可接受"的判定，不参与内容协商排序：SSE 端点只有一种表示。
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"""
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if accept is None or not accept.strip():
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return True
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for entry in accept.split(","):
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parts = entry.split(";")
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media_type = parts[0].strip().lower()
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if media_type not in {SSE_MEDIA_TYPE, "text/*", "*/*"}:
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continue
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quality = 1.0
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for parameter in parts[1:]:
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name, _, value = parameter.partition("=")
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if name.strip().lower() == "q":
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try:
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quality = float(value.strip())
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except ValueError:
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quality = 0.0
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if quality > 0:
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return True
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return False
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@router.post(
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"",
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response_model=AgentRunAcceptedEnvelope,
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status_code=status.HTTP_202_ACCEPTED,
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)
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async def create_agent_run(
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payload: AgentRunCreateRequest,
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request: Request,
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context: RequestContext = Depends(build_request_context), # noqa: B008
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session: AsyncSession = Depends(get_session), # noqa: B008
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) -> AgentRunAcceptedEnvelope:
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request.state.request_context = context
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accepted = await AgentRunApplicationService(session).accept(
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AgentRequest(**payload.model_dump()), context)
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return AgentRunAcceptedEnvelope(
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data=AgentRunAcceptedResponse(
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run_id=accepted.run_id, trace_id=accepted.trace_id, status=accepted.status,
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status_url=f"/api/v1/agent-runs/{accepted.run_id}",
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events_url=f"/api/v1/agent-runs/{accepted.run_id}/events",
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),
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meta={"trace_id": context.trace_id},
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)
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@router.get("/{run_id}", response_model=AgentRunStatusEnvelope)
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async def get_agent_run(
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run_id: str, context: RequestContext = Depends(build_request_context), # noqa: B008
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) -> AgentRunStatusEnvelope:
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"""查询运行（文档 §6.3）。
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文档 §3.3 与 §6.3 都把成功响应定义为 `{data, meta:{trace_id}}` 信封；此前这里
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直接返回资源对象，客户端必须为这一个接口特判。**只改包装结构**：`data` 内的字段名
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与语义保持原样，`meta.trace_id` 用本次请求的 trace（`data.trace_id` 仍是运行自身的
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追踪标识，两者语义不同，不能互相替代）。
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"""
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snapshot = await RunQueryService().get(run_id, context)
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return AgentRunStatusEnvelope(
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data=AgentRunStatusResponse(**asdict(snapshot)),
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meta={"trace_id": context.trace_id},
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)
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@router.get("/{run_id}/events")
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async def stream_agent_run_events(
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run_id: str,
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request: Request,
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context: RequestContext = Depends(build_request_context), # noqa: B008
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) -> StreamingResponse:
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query = RunQueryService()
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# 顺序按文档 §6.4 的主要错误列举：RUN_NOT_FOUND（含 AGENT_PERMISSION_DENIED 同级的
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# 可见性判定）在前、SSE_NOT_ACCEPTABLE 在后。可见性先行（auth 依赖已先于本函数执行）
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# 才能保证"运行是否存在"不因 Accept 头而异：否则用任意 run_id + 非法 Accept 探测，
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# 406 与 404 的差异就等价于一次存在性枚举。
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initial = await query.get(run_id, context)
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if not accepts_event_stream(request.headers.get("Accept")):
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raise SseNotAcceptableError("Accept 必须接受 text/event-stream")
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async def generate() -> AsyncIterator[str]:
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start_sent = False
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async for snapshot in query.watch(initial, context):
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if snapshot is None:
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yield ": heartbeat\n\n"
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continue
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result = snapshot.result or {}
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events = recovery_events(
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run_id=snapshot.run_id, trace_id=snapshot.trace_id, status=snapshot.status,
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error_code=snapshot.error_code, content=result.get("content"),
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tool_calls=result.get("tool_calls"),
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replay=initial.status in {"succeeded", "failed", "cancelled"},
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chunk_size=get_settings().sse_chunk_characters,
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)
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for encoded in encode_events(run_id, events[1:] if start_sent else events):
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yield encoded
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start_sent = True
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return StreamingResponse(generate(), media_type="text/event-stream",
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headers={"Cache-Control": "no-cache"})
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