✨ feat: WP-05 模型网关核心——逻辑模型、流式适配与 Run 真实执行
- 迁移 7+8：logical_model（能力目录）、provider_endpoint（密钥只存环境变量名，永不落库）、turn、model_call（每 attempt 单独持久化：usage/TTFT/错误，Provider 未返回保持 null 不估算——ADR-003）；message.run_id 关联 - OpenAI-compatible 流式适配器：httpx SSE 解析、标准化 StreamChunk（delta/usage/done）、transport 可注入（测试与故障注入）；密钥经环境变量读取不进日志 - Run 执行器：后台执行完整生命周期——running → content.block.started → 真实 content.block.delta*（流式产生，delta_index 单调）→ content.block.completed → message.completed → 终态；assistant 消息为权威快照；ModelCall 记录 usage 与 TTFT；无可用端点时 Run 显式失败并留 error 事件（fail-closed） - post_message：响应提交后由框架 BackgroundTasks 执行 Run（显式预提交保证 Run 落库）；SSE 改为增量轮询（重放 + 等待新事件至终态，30s 上限） - 测试 54 项全绿（+2）：端到端 mock 流验证 ModelCall usage/TTFT/assistant 权威消息、无端点 Run failed + content.block.failed 事件
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"""Run 执行器：调用模型、产生真实流事件与 assistant 消息（WP-05）。
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- 后台任务执行：独立数据库会话（不复用请求会话）。
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- 事件序列（契约第 5 节）：run.status.changed(running) → content.block.started
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→ content.block.delta* → content.block.completed → message.completed →
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run.status.changed(completed/failed)。
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- 首个用户可见 delta 前的失败允许显式 fail；无可用端点时 Run 失败并留 error 事件。
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"""
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import time
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from datetime import UTC, datetime
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from typing import Any
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from sqlalchemy import select
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from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker
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from app.core.ids import new_id
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from app.gateway.adapters import AdapterRequest, GatewayError, stream_chat
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from app.models import (
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AuditEvent,
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Message,
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ModelCall,
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OutboxEvent,
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ProviderEndpoint,
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Run,
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RunEvent,
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Turn,
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)
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async def _next_sequence(db: AsyncSession, run_id: str) -> int:
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last = await db.execute(
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select(RunEvent.sequence)
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.where(RunEvent.run_id == run_id)
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.order_by(RunEvent.sequence.desc())
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.limit(1)
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)
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row = last.scalar_one_or_none()
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return (row + 1) if row is not None else 0
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def _emit(db: AsyncSession, run_id: str, seq: int, event_type: str, data: dict[str, Any]) -> int:
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db.add(RunEvent(run_id=run_id, sequence=seq, type=event_type, data=data))
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return seq + 1
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async def execute_run(
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factory: async_sessionmaker[AsyncSession],
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run_id: str,
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transport: Any | None = None,
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) -> None:
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"""执行一个 Run 至终态。transport 注入仅供测试。"""
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async with factory() as db:
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try:
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run = await db.get(Run, run_id)
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if run is None:
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return
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seq = await _next_sequence(db, run_id)
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# 状态事件：running
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run.status = "running"
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seq = _emit(
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db, run_id, seq, "run.status.changed",
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{"run_id": run_id, "status": "running"},
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)
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await db.commit()
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# 路由：按逻辑模型选择启用端点（优先级升序）
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endpoint = (
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await db.execute(
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select(ProviderEndpoint)
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.where(
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ProviderEndpoint.enabled.is_(True),
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ProviderEndpoint.logical_model_id == "default-chat",
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)
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.order_by(ProviderEndpoint.priority.asc())
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.limit(1)
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)
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).scalar_one_or_none()
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turn = Turn(run_id=run_id, index=0)
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db.add(turn)
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await db.flush()
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if endpoint is None:
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# fail closed：无可用端点时 Run 显式失败，不静默降级
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call = ModelCall(
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turn_id=turn.id, status="failed",
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request_summary={}, error="无可用 Provider 端点（default-chat）",
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started_at=datetime.now(UTC),
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completed_at=datetime.now(UTC),
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)
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db.add(call)
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run.status = "failed"
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run.completed_at = datetime.now(UTC)
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seq = _emit(db, run_id, seq, "content.block.failed", {
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"run_id": run_id, "message_id": None, "index": 0,
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"block": {"id": new_id("block_"), "type": "text", "status": "failed"},
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"error": "no_endpoint_available",
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})
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seq = _emit(db, run_id, seq, "message.completed",
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{"run_id": run_id, "message_ids": [], "final_status": "failed"})
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seq = _emit(db, run_id, seq, "run.status.changed",
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{"run_id": run_id, "status": "failed"})
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await db.commit()
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return
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# 对话历史（最小：当前分支文本消息）
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messages = (
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await db.execute(
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select(Message)
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.where(
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Message.conversation_id == run.conversation_id,
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Message.role.in_(["user", "assistant"]),
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)
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.order_by(Message.created_at.asc(), Message.id.asc())
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.limit(50)
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)
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).scalars().all()
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prompt = [
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{
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"role": m.role,
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"content": "".join(
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str(b.get("text", b.get("source", "")))
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for b in m.content
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if isinstance(b, dict)
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),
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}
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for m in messages
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]
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call = ModelCall(
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turn_id=turn.id, endpoint_id=endpoint.id, status="streaming",
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request_summary={"messages": len(prompt), "model_id": endpoint.model_id},
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started_at=datetime.now(UTC),
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)
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db.add(call)
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await db.commit()
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block_id = new_id("block_")
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seq = _emit(db, run_id, seq, "content.block.started", {
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"run_id": run_id, "index": 0,
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"block": {"id": block_id, "type": "text", "status": "streaming"},
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})
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await db.commit()
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# 流式消费：真实 delta 事件
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started = time.monotonic()
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ttft_ms: int | None = None
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full_text: list[str] = []
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usage: dict[str, int] | None = None
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finish_reason: str | None = None
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delta_index = 0
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try:
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adapter_req = AdapterRequest(messages=prompt, model=endpoint.model_id)
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async for chunk in stream_chat(
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endpoint.base_url, endpoint.model_id, endpoint.api_key_env,
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adapter_req, transport=transport,
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):
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if chunk.kind == "delta" and chunk.text:
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if ttft_ms is None:
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ttft_ms = int((time.monotonic() - started) * 1000)
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full_text.append(chunk.text)
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seq = _emit(db, run_id, seq, "content.block.delta", {
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"run_id": run_id, "block_id": block_id,
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"delta_index": delta_index,
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"delta": {"type": "text_append", "text": chunk.text},
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})
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delta_index += 1
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await db.commit()
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elif chunk.kind == "usage" and chunk.usage:
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usage = chunk.usage
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elif chunk.kind == "done" and chunk.finish_reason:
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finish_reason = chunk.finish_reason
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except GatewayError as exc:
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failed_call = await db.get(ModelCall, call.id)
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assert failed_call is not None
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call.status = "failed"
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call.error = str(exc)[:500]
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call.completed_at = datetime.now(UTC)
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run.status = "failed"
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run.completed_at = datetime.now(UTC)
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seq = _emit(db, run_id, seq, "content.block.failed", {
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"run_id": run_id, "block_id": block_id, "index": 0,
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"error": "upstream_error",
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})
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seq = _emit(db, run_id, seq, "message.completed",
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{"run_id": run_id, "message_ids": [], "final_status": "failed"})
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seq = _emit(db, run_id, seq, "run.status.changed",
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{"run_id": run_id, "status": "failed"})
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await db.commit()
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return
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text = "".join(full_text)
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seq = _emit(db, run_id, seq, "content.block.completed", {
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"run_id": run_id, "index": 0,
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"block": {"id": block_id, "type": "text", "status": "completed", "text": text},
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})
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# assistant 消息（权威快照）
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assistant = Message(
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conversation_id=run.conversation_id,
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branch_id=(
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await db.execute(
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select(Message.branch_id).where(Message.run_id == run_id).limit(1)
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)
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).scalar_one_or_none() or new_id("branch_"),
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role="assistant",
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realm="reality",
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content=[{"id": block_id, "type": "text", "text": text, "status": "completed"}],
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run_id=run_id,
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)
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db.add(assistant)
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await db.flush()
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seq = _emit(db, run_id, seq, "message.completed", {
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"run_id": run_id, "message_ids": [assistant.id], "final_status": "completed",
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})
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run.status = "completed"
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run.completed_at = datetime.now(UTC)
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seq = _emit(db, run_id, seq, "run.status.changed",
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{"run_id": run_id, "status": "completed"})
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success_call = await db.get(ModelCall, call.id)
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assert success_call is not None
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success_call.status = "succeeded"
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# Provider 未返回的 usage 保持 None：不估算伪装（ADR-003）
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success_call.usage = usage
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success_call.ttft_ms = ttft_ms
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success_call.completed_at = datetime.now(UTC)
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if finish_reason:
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success_call.request_summary = {
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**success_call.request_summary, "finish_reason": finish_reason
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}
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db.add(
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AuditEvent(
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actor_type="system", actor_id="gateway", action="model_call.completed",
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aggregate_type="run", aggregate_id=run_id,
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payload={"endpoint": endpoint.name, "usage": usage, "ttft_ms": ttft_ms},
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)
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)
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db.add(
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OutboxEvent(
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aggregate_type="message", aggregate_id=assistant.id,
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event_type="message.created",
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payload={"message_id": assistant.id, "run_id": run_id, "role": "assistant"},
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)
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)
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await db.commit()
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except Exception:
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await db.rollback()
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raise
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