perf(pricebot): 透传复用共享 httpx 单例,免每请求重建 SSL 上下文 + 绕过进程代理 (#87)

coupon/compare 透传原先每请求 async with httpx.AsyncClient(...) 新建:
每次重建 SSL 上下文(加载 certifi CA)实测 ~1s+,而 pricebot 是纯 HTTP
透传根本用不到 TLS;且 trust_env 默认 True 会把 http://localhost:8000
经进程代理(Clash)再绕几秒。

抽 app/core/pricebot_client.py 共享单例:trust_env=False 直连,lifespan
启动预热(SSL 一次性成本付在启动)、关停 aclose;timeout 下放到 .post()
保留 coupon 30s / compare 60s 差异。keep-alive 复用 TCP,每帧降到个位数 ms。

---------

Co-authored-by: guke <guke@autohome.com.cn>
Reviewed-on: #87
Co-authored-by: guke <guke@wonderable.ai>
Co-committed-by: guke <guke@wonderable.ai>

app/api/v1/compare.py

@@ -26,6 +26,7 @@ import httpx
 from fastapi import APIRouter, HTTPException, Request, status
 
 from app.core.config import settings
+from app.core.pricebot_client import get_pricebot_client
 from app.core.pricebot_router import pick_pricebot
 
 logger = logging.getLogger("shagua.compare")
@@ -65,10 +66,10 @@ async def _passthrough(request: Request, upstream_path: str) -> dict[str, Any]:
     )
 
     try:
-        async with httpx.AsyncClient(timeout=timeout) as client:
-            resp = await client.post(
-                url, content=raw, headers={"Content-Type": "application/json"}
-            )
+        client = get_pricebot_client()
+        resp = await client.post(
+            url, content=raw, headers={"Content-Type": "application/json"}, timeout=timeout
+        )
     except httpx.RequestError as e:
         logger.error("[pricebot] request failed: %s", e)
         raise HTTPException(

app/api/v1/coupon.py

@@ -20,6 +20,7 @@ from fastapi.concurrency import run_in_threadpool
 
 from app.api.deps import CurrentUser, DbSession
 from app.core.config import settings
+from app.core.pricebot_client import get_pricebot_client
 from app.core.pricebot_router import pick_pricebot
 from app.db.session import SessionLocal
 from app.repositories import coupon_state as coupon_repo
@@ -141,10 +142,10 @@ async def coupon_step(
     )
 
     try:
-        async with httpx.AsyncClient(timeout=timeout) as client:
-            resp = await client.post(
-                url, content=raw, headers={"Content-Type": "application/json"}
-            )
+        client = get_pricebot_client()
+        resp = await client.post(
+            url, content=raw, headers={"Content-Type": "application/json"}, timeout=timeout
+        )
     except httpx.RequestError as e:
         logger.error("[pricebot] request failed: %s", e)
         raise HTTPException(