浏览器自动恢复逻辑

app/services/cloudflare_session.py

@@ -96,7 +96,10 @@ class CloudflareSessionManager:
                 return self._to_verified_session(existing)
 
         logger.debug("创建新会话：session_name=%s force_refresh=%s", session_name, force_refresh)
-        session = await self._create_verified_session(session_name=session_name, target_url=target_url)
+        session = await self._build_with_browser_retry(
+            f"创建验证会话({session_name})",
+            lambda: self._create_verified_session(session_name=session_name, target_url=target_url),
+        )
         return session
 
     async def fetch_html(self, target_url: str) -> tuple[str, VerifiedSession]:
@@ -135,9 +138,28 @@ class CloudflareSessionManager:
                 return html, self._warm_to_session(warm)
 
             logger.info("创建保活上下文：session_name=%s", session_name)
-            warm, html = await self._build_warm_context(session_name, target_url)
+            warm, html = await self._build_with_browser_retry(
+                f"创建保活上下文({session_name})",
+                lambda: self._build_warm_context(session_name, target_url),
+            )
             return html, self._warm_to_session(warm)
 
+    async def _build_with_browser_retry(self, what: str, factory: Any) -> Any:
+        """执行 factory()；若因浏览器断链失败，重建浏览器后整段重试一次。
+
+        factory 每次都从零创建上下文与页面（_build_warm_context / _create_verified_session
+        均如此），故断链重建后重试是安全的。此层覆盖 new_page、goto、content 等
+        「上下文创建之后」才发生的断链——这些阶段浏览器池内逐操作的重试无法触及。
+        """
+        try:
+            return await factory()
+        except Exception as exc:
+            if not BrowserPool.is_disconnect_error(exc):
+                raise
+            logger.warning("%s 因浏览器断链失败，重建后重试一次：err=%s", what, exc)
+            await self._browser_pool.ensure_ready()
+            return await factory()
+
     async def _reuse_warm(self, session_name: str, target_url: str) -> tuple[str, WarmContext] | None:
         """尝试复用已有保活上下文。