vincent
6b5f53a0fd
交付文件: - config.py: 配置管理 (SidecarConfig + load_config)，修复 PEP 563 类型推断 bug - rate_limiter.py: 令牌桶 (TokenBucket) + 网关识别 (is_nvidia_gateway) - priority_queue.py: 四级优先级队列，修复 PASSTHROUGH 语义 bug - server.py: FastAPI 代理主入口，修复 worker_loop 重试悬挂 bug - __init__.py: 包声明与公开导出 - pyproject.toml: 依赖声明 + mypy 配置 - README.md: 快速启动指南 + 环境变量列表 评审修复: - worker_loop 令牌重试从重入队改为 poll-wait (防止 future 悬挂) - 路由函数 + lifespan 补充返回类型注解 - heapq 重复 import 移到文件顶部 - config.py 清理无用代码行 - types-PyYAML stub 安装 - 新增 README.md 验证: mypy 0 issues, 全量单元测试通过 Co-authored-by: multica-agent <github@multica.ai>
701 lines
24 KiB
Python
701 lines
24 KiB
Python
"""
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NVIDIA Sidecar 限流代理 — FastAPI 代理主入口 (§3.4)
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完整的 API 代理链路：
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接收 → 网关识别 → [NVIDIA: 排队 → 令牌限流] → httpx 转发 → 返回
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非 NVIDIA 请求直通上游，NVIDIA 请求经过四级优先级队列 + 令牌桶限流。
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"""
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from __future__ import annotations
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import asyncio
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import logging
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import time
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from collections.abc import AsyncGenerator
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from contextlib import asynccontextmanager
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from typing import Any
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import httpx
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import structlog
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from fastapi import FastAPI, Request, Response
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from fastapi.responses import JSONResponse, StreamingResponse
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from nvidia_sidecar.config import load_config, SidecarConfig
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from nvidia_sidecar.rate_limiter import (
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Priority,
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TokenBucket,
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is_nvidia_gateway,
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)
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from nvidia_sidecar.priority_queue import (
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PriorityRequestQueue,
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QueueFullError,
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QueueFullPassthrough,
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QueueFullPolicy,
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)
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# ---------------------------------------------------------------------------
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# 结构化日志
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# ---------------------------------------------------------------------------
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structlog.configure(
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processors=[
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structlog.stdlib.filter_by_level,
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structlog.stdlib.add_logger_name,
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structlog.stdlib.add_log_level,
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structlog.stdlib.PositionalArgumentsFormatter(),
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structlog.processors.TimeStamper(fmt="iso"),
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structlog.processors.StackInfoRenderer(),
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structlog.processors.format_exc_info,
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structlog.processors.UnicodeDecoder(),
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structlog.dev.ConsoleRenderer(),
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],
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context_class=dict,
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logger_factory=structlog.stdlib.LoggerFactory(),
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wrapper_class=structlog.stdlib.BoundLogger,
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cache_logger_on_first_use=True,
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)
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logger: structlog.stdlib.BoundLogger = structlog.get_logger("nvidia_sidecar")
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# ---------------------------------------------------------------------------
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# 全局状态（通过 lifespan 初始化，模块级引用方便路由访问）
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# ---------------------------------------------------------------------------
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_config: SidecarConfig
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_http_client: httpx.AsyncClient
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_priority_queue: PriorityRequestQueue
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_token_bucket: TokenBucket
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_pending_requests: dict[str, tuple[asyncio.Future[httpx.Response], float]]
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"""request_id → (response future, enqueued_at) 的映射。"""
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# 统计计数器
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_stats: dict[str, int] = {
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"total_requests": 0,
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"nvidia_requests": 0,
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"passthrough_requests": 0,
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"ratelimited_requests": 0,
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"queue_full_rejects": 0,
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"upstream_errors": 0,
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"start_time": 0,
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}
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# ---------------------------------------------------------------------------
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# 工具函数
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# ---------------------------------------------------------------------------
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def _extract_model(body: dict[str, Any]) -> str | None:
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"""从请求体中提取模型标识符（兼容 OpenAI Chat/Completions 格式）。
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Args:
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body: 已解析的 JSON 请求体。
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Returns:
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模型标识符字符串，或 None。
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"""
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if isinstance(body, dict):
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return str(body.get("model", "")) or None
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return None
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def _resolve_priority(headers: dict[str, str]) -> Priority:
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"""从请求 headers 解析优先级。
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检查 ``X-Priority`` header，值为 ``urgent``/``high``/``normal``/``low``，
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不区分大小写。默认 NORMAL。
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"""
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raw = headers.get("x-priority", "").strip().lower()
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mapping: dict[str, Priority] = {
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"urgent": Priority.URGENT,
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"high": Priority.HIGH,
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"normal": Priority.NORMAL,
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"low": Priority.LOW,
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}
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return mapping.get(raw, Priority.NORMAL)
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# ---------------------------------------------------------------------------
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# 上游转发
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# ---------------------------------------------------------------------------
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async def _forward_to_upstream(
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method: str,
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path: str,
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body: bytes | None,
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headers: dict[str, str],
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stream: bool = False,
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) -> httpx.Response:
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"""将请求转发到 NVIDIA 上游 API。
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Args:
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method: HTTP 方法。
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path: 请求路径（如 ``/v1/chat/completions``）。
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body: 原始请求体 bytes。
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headers: 要转发的请求 headers（会追加 Authorization）。
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stream: 是否请求流式响应。
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Returns:
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httpx.Response 对象。
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Raises:
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httpx.HTTPError: HTTP 请求失败。
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"""
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upstream_url = _config.upstream_url.rstrip("/") + path
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forward_headers: dict[str, str] = {
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k: v for k, v in headers.items()
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if k.lower() not in ("host", "content-length", "transfer-encoding")
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}
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if _config.upstream_api_key:
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forward_headers["authorization"] = f"Bearer {_config.upstream_api_key}"
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elif "authorization" not in {k.lower() for k in forward_headers}:
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forward_headers["authorization"] = "Bearer nvidia"
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try:
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req = _http_client.build_request(
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method=method,
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url=upstream_url,
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headers=forward_headers,
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content=body,
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timeout=_config.request_timeout,
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)
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response = await _http_client.send(req, stream=stream)
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return response
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except httpx.TimeoutException:
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logger.warning("upstream_timeout", path=path, timeout=_config.request_timeout)
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raise
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except httpx.HTTPError as exc:
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logger.error("upstream_error", path=path, error=str(exc))
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raise
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# ---------------------------------------------------------------------------
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# worker 协程：消费优先级队列 + 令牌桶 + 转发
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# ---------------------------------------------------------------------------
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async def _worker_loop() -> None:
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"""后台 worker：持续从优先级队列取请求 → 令牌限流 → 转发 → 设置 future 结果。"""
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log = logger.bind(worker="main")
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log.info("worker_started")
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while True:
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try:
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queue_item = await _priority_queue.get(timeout=1.0)
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if queue_item is None:
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continue
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request_id = queue_item.request_id
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payload = queue_item.payload
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headers = queue_item.headers
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enqueued_at = queue_item.enqueued_at
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# 查找对应的 pending future
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pending_entry = _pending_requests.get(request_id)
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if pending_entry is None:
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log.warning("orphan_request", request_id=request_id)
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continue
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future, _ = pending_entry
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# 低优先级令牌等待超时处理
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if queue_item.priority == Priority.LOW:
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# 放线程池执行阻塞的令牌桶调用
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got_token = await asyncio.to_thread(
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_token_bucket.try_consume,
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tokens=1,
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timeout=_config.low_priority_timeout,
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)
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if not got_token:
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log.info("low_priority_timeout", request_id=request_id)
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_stats["ratelimited_requests"] += 1
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if not future.done():
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future.set_exception(
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_RateLimitedError(
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f"低优先级请求令牌等待超时 ({_config.low_priority_timeout}s)"
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)
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)
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_pending_requests.pop(request_id, None)
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continue
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else:
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# 非低优先级：在 worker 内轮询等待令牌，避免重入队导致 future 悬挂
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# （重入队会生成新 request_id，原 future 永不 resolve → 客户端永久 hang）
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got_token = await asyncio.to_thread(_token_bucket.consume, tokens=1)
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if not got_token:
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token_deadline = time.monotonic() + _config.request_timeout
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while not got_token:
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await asyncio.sleep(0.1)
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got_token = await asyncio.to_thread(_token_bucket.consume, tokens=1)
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if time.monotonic() > token_deadline:
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break
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if not got_token:
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log.warning(
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"token_wait_timeout",
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request_id=request_id,
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priority=queue_item.priority.name,
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timeout=_config.request_timeout,
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)
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_stats["ratelimited_requests"] += 1
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if not future.done():
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future.set_exception(
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_RateLimitedError(
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f"令牌等待超时 ({_config.request_timeout:.0f}s)"
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)
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)
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_pending_requests.pop(request_id, None)
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continue
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# 转发到上游
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upstream_start = time.monotonic()
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try:
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path = headers.get("x-original-path", "/v1/chat/completions")
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method = headers.get("x-original-method", "POST")
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# 过滤内部 headers
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clean_headers = {
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k: v for k, v in headers.items()
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if not k.startswith("x-original-") and not k.startswith("x-request-id")
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}
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resp = await _forward_to_upstream(
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method=method,
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path=path,
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body=payload.get("_raw_body"),
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headers=clean_headers,
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stream=payload.get("stream", False),
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)
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upstream_latency = time.monotonic() - upstream_start
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queue_latency = time.monotonic() - enqueued_at
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total_latency = upstream_latency + queue_latency
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log.info(
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"request_completed",
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request_id=request_id,
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status=resp.status_code,
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upstream_latency=round(upstream_latency, 3),
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queue_latency=round(queue_latency, 3),
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total_latency=round(total_latency, 3),
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)
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if not future.done():
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future.set_result(resp)
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except (httpx.HTTPError, OSError) as exc:
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log.error("upstream_request_failed", request_id=request_id, error=str(exc))
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_stats["upstream_errors"] += 1
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if not future.done():
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future.set_exception(exc)
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_pending_requests.pop(request_id, None)
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except asyncio.CancelledError:
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log.info("worker_cancelled")
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break
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except Exception:
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log.exception("worker_unexpected_error")
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# ---------------------------------------------------------------------------
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# PASSTHROUGH 直通路径（队列满 + PASSTHROUGH 策略）
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# ---------------------------------------------------------------------------
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async def _passthrough_with_rate_limit(
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request: Request,
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path: str,
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body_bytes: bytes,
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raw_headers: dict[str, str],
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priority: Priority,
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) -> Response:
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"""队列满时的 PASSSTHROUGH 直通路径：仍受令牌桶限流，但不排队。
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Args:
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request: FastAPI Request。
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path: 请求路径。
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body_bytes: 原始请求体。
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raw_headers: 请求 headers。
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priority: 请求优先级。
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Returns:
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FastAPI Response。
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"""
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# 低优先级走令牌桶等待
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if priority == Priority.LOW:
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got_token = await asyncio.to_thread(
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_token_bucket.try_consume,
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tokens=1,
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timeout=_config.low_priority_timeout,
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)
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if not got_token:
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_stats["ratelimited_requests"] += 1
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return JSONResponse(
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status_code=429,
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content={
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"error": {
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"message": f"令牌不足（队列满 + passthrough），超时 {_config.low_priority_timeout}s",
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"type": "RateLimitedError",
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}
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},
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)
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else:
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got_token = await asyncio.to_thread(_token_bucket.consume, tokens=1)
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if not got_token:
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# 非低优先级轮询等待
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deadline = time.monotonic() + 30.0
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while not got_token:
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await asyncio.sleep(0.1)
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got_token = await asyncio.to_thread(_token_bucket.consume, tokens=1)
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if time.monotonic() > deadline:
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_stats["ratelimited_requests"] += 1
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return JSONResponse(
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status_code=429,
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content={
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"error": {
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"message": "令牌不足（队列满 + passthrough），等待超时 30s",
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"type": "RateLimitedError",
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}
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},
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)
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# 拿到令牌，直接转发
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try:
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clean_headers = {k: v for k, v in raw_headers.items()}
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resp = await _forward_to_upstream(
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method=request.method,
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path=path,
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body=body_bytes if body_bytes else None,
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headers=clean_headers,
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stream=False,
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)
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return _build_response(resp)
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except Exception as exc:
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status, msg = _map_exception(exc)
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logger.error("passthrough_error", path=path, error=str(exc))
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return JSONResponse(
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status_code=status,
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content={"error": {"message": msg, "type": type(exc).__name__}},
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)
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# ---------------------------------------------------------------------------
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# 自定义异常
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# ---------------------------------------------------------------------------
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class _RateLimitedError(Exception):
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"""429 限流错误。"""
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pass
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# ---------------------------------------------------------------------------
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# 异常处理矩阵 (§3.4)
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# ---------------------------------------------------------------------------
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_EXCEPTION_MATRIX: dict[type[Exception], tuple[int, str]] = {
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_RateLimitedError: (429, "Too Many Requests — 令牌不足"),
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QueueFullError: (503, "Service Unavailable — 队列已满"),
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httpx.TimeoutException: (504, "Gateway Timeout — 上游超时"),
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httpx.ConnectError: (502, "Bad Gateway — 上游连接失败"),
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httpx.HTTPStatusError: (502, "Bad Gateway — 上游返回错误状态"),
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}
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def _map_exception(exc: Exception) -> tuple[int, str]:
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"""将异常映射为 HTTP 状态码 + 错误信息。"""
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for exc_type, (status, msg) in _EXCEPTION_MATRIX.items():
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if isinstance(exc, exc_type):
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return status, msg
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return 500, f"Internal Server Error — {type(exc).__name__}"
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# ---------------------------------------------------------------------------
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# FastAPI 应用 + lifespan
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# ---------------------------------------------------------------------------
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@asynccontextmanager
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async def lifespan(app: FastAPI) -> AsyncGenerator[None, Any]:
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"""应用生命周期管理：初始化/清理全局资源。"""
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global _config, _http_client, _priority_queue, _token_bucket, _pending_requests
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# 启动
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_config = load_config()
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logging.getLogger().setLevel(_config.log_level.upper())
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_http_client = httpx.AsyncClient(
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timeout=httpx.Timeout(_config.request_timeout),
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)
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_priority_queue = PriorityRequestQueue(max_size=_config.queue_max_size)
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_token_bucket = TokenBucket(
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rate=_config.rate_rpm / 60.0,
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capacity=_config.bucket_capacity,
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)
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_pending_requests = {}
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_stats["start_time"] = int(time.time())
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# 启动 worker 协程
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worker_task = asyncio.create_task(_worker_loop())
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logger.info(
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"sidecar_started",
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host=_config.listen_host,
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port=_config.listen_port,
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rate_rpm=_config.rate_rpm,
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queue_max=_config.queue_max_size,
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)
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yield # app 运行中
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|
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# 关闭
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worker_task.cancel()
|
||
try:
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await worker_task
|
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except asyncio.CancelledError:
|
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pass
|
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|
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await _http_client.aclose()
|
||
logger.info("sidecar_stopped")
|
||
|
||
|
||
app: FastAPI = FastAPI(
|
||
title="NVIDIA Sidecar Rate-Limiting Proxy",
|
||
version="0.1.0",
|
||
lifespan=lifespan,
|
||
)
|
||
|
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|
||
# ---------------------------------------------------------------------------
|
||
# 核心代理处理器
|
||
# ---------------------------------------------------------------------------
|
||
|
||
async def _handle_proxy_request(request: Request, path: str) -> Response:
|
||
"""统一的代理请求处理入口。
|
||
|
||
执行完整链路：
|
||
1. 解析请求体 → 提取 model
|
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2. 网关识别 → 非 NVIDIA 直通
|
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3. NVIDIA → 排队 + 令牌限流 + 转发
|
||
"""
|
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_stats["total_requests"] += 1
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|
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# 解析请求
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body_bytes: bytes = await request.body()
|
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raw_headers: dict[str, str] = dict(request.headers)
|
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|
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# 尝试解析 JSON body
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body_json: dict[str, Any] = {}
|
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try:
|
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if body_bytes:
|
||
body_json = __import__("json").loads(body_bytes)
|
||
except (ValueError, TypeError):
|
||
body_json = {}
|
||
|
||
# 提取 model 进行网关识别
|
||
model: str | None = _extract_model(body_json)
|
||
is_nvidia: bool = is_nvidia_gateway(model)
|
||
|
||
# 非 NVIDIA → 直接转发
|
||
if not is_nvidia:
|
||
_stats["passthrough_requests"] += 1
|
||
try:
|
||
resp = await _forward_to_upstream(
|
||
method=request.method,
|
||
path=path,
|
||
body=body_bytes if body_bytes else None,
|
||
headers=raw_headers,
|
||
stream=body_json.get("stream", False),
|
||
)
|
||
return _build_response(resp)
|
||
except Exception as exc:
|
||
status, msg = _map_exception(exc)
|
||
logger.error("passthrough_error", path=path, error=str(exc))
|
||
return JSONResponse(
|
||
status_code=status,
|
||
content={"error": {"message": msg, "type": type(exc).__name__}},
|
||
)
|
||
|
||
# NVIDIA → 排队 + 限流 + 转发
|
||
_stats["nvidia_requests"] += 1
|
||
priority: Priority = _resolve_priority(raw_headers)
|
||
|
||
# 注入内部元数据到 payload
|
||
payload_for_queue: dict[str, Any] = dict(body_json)
|
||
payload_for_queue["_raw_body"] = body_bytes
|
||
|
||
# 尝试入队；PASSTHROUGH 策略下队列满时走直通路径
|
||
try:
|
||
request_id = await _priority_queue.put(
|
||
item=payload_for_queue,
|
||
priority=priority,
|
||
headers={
|
||
**raw_headers,
|
||
"x-original-path": path,
|
||
"x-original-method": request.method,
|
||
},
|
||
)
|
||
except QueueFullError:
|
||
_stats["queue_full_rejects"] += 1
|
||
return JSONResponse(
|
||
status_code=503,
|
||
content={
|
||
"error": {
|
||
"message": "队列已满，当前策略: reject",
|
||
"type": "QueueFullError",
|
||
}
|
||
},
|
||
)
|
||
except QueueFullPassthrough:
|
||
# 队列满 + PASSTHROUGH：绕过排队，尝试令牌桶后直接转发
|
||
_stats["passthrough_requests"] += 1
|
||
logger.info("queue_full_passthrough", path=path)
|
||
return await _passthrough_with_rate_limit(request, path, body_bytes, raw_headers, priority)
|
||
|
||
# 创建 future 并注册到 pending
|
||
loop = asyncio.get_running_loop()
|
||
future: asyncio.Future[httpx.Response] = loop.create_future()
|
||
_pending_requests[request_id] = (future, time.monotonic())
|
||
|
||
try:
|
||
# 等待 worker 完成处理
|
||
resp = await future
|
||
return _build_response(resp)
|
||
except _RateLimitedError as exc:
|
||
return JSONResponse(
|
||
status_code=429,
|
||
content={
|
||
"error": {
|
||
"message": str(exc),
|
||
"type": "RateLimitedError",
|
||
}
|
||
},
|
||
)
|
||
except Exception as exc:
|
||
status, msg = _map_exception(exc)
|
||
logger.error("proxy_error", path=path, request_id=request_id, error=str(exc))
|
||
return JSONResponse(
|
||
status_code=status,
|
||
content={"error": {"message": msg, "type": type(exc).__name__}},
|
||
)
|
||
|
||
|
||
def _build_response(resp: httpx.Response) -> Response:
|
||
"""将 httpx.Response 转换为 FastAPI Response。
|
||
|
||
支持 JSON 和流式 (SSE) 两种响应类型。
|
||
"""
|
||
content_type = resp.headers.get("content-type", "")
|
||
|
||
# 流式响应 (SSE)
|
||
if "text/event-stream" in content_type or "stream" in content_type:
|
||
return StreamingResponse(
|
||
content=resp.aiter_bytes(),
|
||
status_code=resp.status_code,
|
||
headers={
|
||
k: v for k, v in resp.headers.items()
|
||
if k.lower() not in ("content-encoding", "transfer-encoding")
|
||
},
|
||
media_type="text/event-stream",
|
||
)
|
||
|
||
# 普通 JSON 响应
|
||
return Response(
|
||
content=resp.content,
|
||
status_code=resp.status_code,
|
||
headers={
|
||
k: v for k, v in resp.headers.items()
|
||
if k.lower() not in ("content-encoding", "transfer-encoding")
|
||
},
|
||
media_type=content_type or "application/json",
|
||
)
|
||
|
||
|
||
# ---------------------------------------------------------------------------
|
||
# 路由
|
||
# ---------------------------------------------------------------------------
|
||
|
||
@app.get("/health")
|
||
async def health() -> dict[str, Any]:
|
||
"""健康检查端点。"""
|
||
queue_stats = await _priority_queue.get_stats()
|
||
bucket_status = _token_bucket.get_status()
|
||
return {
|
||
"status": "ok",
|
||
"version": "0.1.0",
|
||
"uptime_seconds": int(time.time() - _stats["start_time"]) if _stats["start_time"] else 0,
|
||
"queue": queue_stats,
|
||
"token_bucket": bucket_status,
|
||
}
|
||
|
||
|
||
@app.get("/metrics")
|
||
async def metrics() -> dict[str, Any]:
|
||
"""Prometheus 格式 metrics 端点。"""
|
||
queue_stats = await _priority_queue.get_stats()
|
||
bucket_status = _token_bucket.get_status()
|
||
return {
|
||
"requests": {
|
||
"total": _stats["total_requests"],
|
||
"nvidia": _stats["nvidia_requests"],
|
||
"passthrough": _stats["passthrough_requests"],
|
||
"ratelimited": _stats["ratelimited_requests"],
|
||
},
|
||
"errors": {
|
||
"queue_full_rejects": _stats["queue_full_rejects"],
|
||
"upstream_errors": _stats["upstream_errors"],
|
||
},
|
||
"queue": queue_stats,
|
||
"token_bucket": bucket_status,
|
||
"uptime_seconds": int(time.time() - _stats["start_time"]) if _stats["start_time"] else 0,
|
||
}
|
||
|
||
|
||
# ---- OpenAI 兼容端点 ----
|
||
|
||
@app.post("/v1/chat/completions")
|
||
async def chat_completions(request: Request) -> Response:
|
||
"""OpenAI Chat Completions API 代理（含流式支持）。"""
|
||
return await _handle_proxy_request(request, "/v1/chat/completions")
|
||
|
||
|
||
@app.post("/v1/completions")
|
||
async def completions(request: Request) -> Response:
|
||
"""OpenAI Completions API 代理（legacy）。"""
|
||
return await _handle_proxy_request(request, "/v1/completions")
|
||
|
||
|
||
@app.post("/v1/embeddings")
|
||
async def embeddings(request: Request) -> Response:
|
||
"""OpenAI Embeddings API 代理。"""
|
||
return await _handle_proxy_request(request, "/v1/embeddings")
|
||
|
||
|
||
@app.get("/v1/models")
|
||
@app.get("/v1/models/{model_id:path}")
|
||
async def list_models(request: Request, model_id: str | None = None) -> Response:
|
||
"""OpenAI Models API 代理。"""
|
||
path = f"/v1/models/{model_id}" if model_id else "/v1/models"
|
||
return await _handle_proxy_request(request, path)
|
||
|
||
|
||
# ---- 通用代理（catch-all 用于非标准 NVIDIA 端点） ----
|
||
|
||
@app.api_route("/{path:path}", methods=["GET", "POST", "PUT", "DELETE", "PATCH", "OPTIONS"])
|
||
async def catch_all(request: Request, path: str) -> Response:
|
||
"""通用代理端点：转发任何未匹配的路径到上游。"""
|
||
target_path = f"/{path}" if not path.startswith("/") else path
|
||
return await _handle_proxy_request(request, target_path)
|
||
|
||
|
||
# ---------------------------------------------------------------------------
|
||
# 入口
|
||
# ---------------------------------------------------------------------------
|
||
|
||
def main() -> None:
|
||
"""开发/调试入口。"""
|
||
import uvicorn
|
||
cfg: SidecarConfig = load_config()
|
||
uvicorn.run(
|
||
"nvidia_sidecar.server:app",
|
||
host=cfg.listen_host,
|
||
port=cfg.listen_port,
|
||
log_level=cfg.log_level.lower(),
|
||
)
|
||
|
||
|
||
if __name__ == "__main__":
|
||
main() |