From ce6445bf774bcd1934b60c670f77290653fe834a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=AD=A6=E9=98=B3?= <wuy398@chinaunicom.cn>
Date: Thu, 7 May 2026 15:33:03 +0800
Subject: [PATCH] Keep chat stream alive during long runs

---
 frontend/app/app/api/chat/route.ts | 102 ++++++++++++++++-------------
 1 file changed, 58 insertions(+), 44 deletions(-)

diff --git a/frontend/app/app/api/chat/route.ts b/frontend/app/app/api/chat/route.ts
index 207b431..1ce5e78 100644
--- a/frontend/app/app/api/chat/route.ts
+++ b/frontend/app/app/api/chat/route.ts
@@ -13,6 +13,7 @@ import {
 } from "@/lib/claw-auth";
 
 export const runtime = "nodejs";
+export const maxDuration = 300;
 
 type ClawChatResponse = {
 	final_output?: string;
@@ -92,55 +93,68 @@ export async function POST(req: Request) {
 	const stream = createUIMessageStream({
 		execute: async ({ writer }) => {
 			const streamState = { textStarted: false, textStreamed: false };
+			let heartbeatCount = 0;
+			const heartbeat = setInterval(() => {
+				heartbeatCount += 1;
+				writer.write({
+					type: "reasoning-delta",
+					id: "reasoning-1",
+					delta: `\n仍在处理请求，已等待 ${formatDuration(heartbeatCount * 15000)}。`,
+				});
+			}, 15000);
 			writer.write({ type: "start" });
 			writer.write({ type: "start-step" });
 
-			const startedAt = Date.now();
-			writer.write({ type: "reasoning-start", id: "reasoning-1" });
-			writer.write({
-				type: "reasoning-delta",
-				id: "reasoning-1",
-				delta: "思考中，正在判断是否需要调用工具。",
-			});
-			const payload = await callClawBackendStream(
-				userPrompt,
-				runtimeContext,
-				account.id,
-				sessionId,
-				resumeId,
-				writer,
-				streamState,
-			);
-			const elapsedMs = payload.elapsed_ms ?? Date.now() - startedAt;
-			const text = formatClawResponse(payload);
+			try {
+				const startedAt = Date.now();
+				writer.write({ type: "reasoning-start", id: "reasoning-1" });
+				writer.write({
+					type: "reasoning-delta",
+					id: "reasoning-1",
+					delta: "思考中，正在判断是否需要调用工具。",
+				});
+				const payload = await callClawBackendStream(
+					userPrompt,
+					runtimeContext,
+					account.id,
+					sessionId,
+					resumeId,
+					writer,
+					streamState,
+				);
+				const elapsedMs = payload.elapsed_ms ?? Date.now() - startedAt;
+				const text = formatClawResponse(payload);
 
-			writer.write({
-				type: "reasoning-delta",
-				id: "reasoning-1",
-				delta: `\n思考并执行完成，用时 ${formatDuration(elapsedMs)}。`,
-			});
-			writer.write({ type: "reasoning-end", id: "reasoning-1" });
-			writeToolTrace(writer, payload.transcript);
-			if (!streamState.textStreamed) {
-				writer.write({ type: "text-start", id: "text-1" });
-				writer.write({ type: "text-delta", id: "text-1", delta: text });
-				writer.write({ type: "text-end", id: "text-1" });
-			} else if (streamState.textStarted) {
-				writer.write({ type: "text-end", id: "text-1" });
-				streamState.textStarted = false;
+				writer.write({
+					type: "reasoning-delta",
+					id: "reasoning-1",
+					delta: `\n思考并执行完成，用时 ${formatDuration(elapsedMs)}。`,
+				});
+				writer.write({ type: "reasoning-end", id: "reasoning-1" });
+				writeToolTrace(writer, payload.transcript);
+				if (!streamState.textStreamed) {
+					writer.write({ type: "text-start", id: "text-1" });
+					writer.write({ type: "text-delta", id: "text-1", delta: text });
+					writer.write({ type: "text-end", id: "text-1" });
+				} else if (streamState.textStarted) {
+					writer.write({ type: "text-end", id: "text-1" });
+					streamState.textStarted = false;
+				}
+				writer.write({ type: "finish-step" });
+				writer.write({
+					type: "finish",
+					finishReason: payload.error ? "error" : "stop",
+					messageMetadata: {
+						sessionId: payload.session_id,
+						toolCalls: payload.tool_calls,
+						stopReason: payload.stop_reason,
+						elapsedMs,
+						usage: payload.usage,
+					},
+				});
+			} finally {
+				clearInterval(heartbeat);
 			}
-			writer.write({ type: "finish-step" });
-			writer.write({
-				type: "finish",
-				finishReason: payload.error ? "error" : "stop",
-				messageMetadata: {
-					sessionId: payload.session_id,
-					toolCalls: payload.tool_calls,
-					stopReason: payload.stop_reason,
-					elapsedMs,
-					usage: payload.usage,
-				},
-			});
 		},
 	});