perf: 优化系统提示消息

src/pages/api/chat/chatGpt.ts

@@ -35,9 +35,7 @@ export default async function handler(req: NextApiRequest, res: NextApiResponse)
     // 上下文长度过滤
     const maxContext = model.security.contextMaxLen;
     const filterPrompts =
-      prompts.length > maxContext + 2
-        ? [prompts[0], ...prompts.slice(prompts.length - maxContext)]
-        : prompts.slice(0, prompts.length);
+      prompts.length > maxContext ? prompts.slice(prompts.length - maxContext) : prompts;
 
     // 格式化文本内容
     const map = {
@@ -51,11 +49,13 @@ export default async function handler(req: NextApiRequest, res: NextApiResponse)
         content: item.value
       })
     );
-    // 第一句话，强调代码类型
-    formatPrompts.unshift({
-      role: ChatCompletionRequestMessageRoleEnum.System,
-      content: '如果你想返回代码，请务必声明代码的类型！并且在代码块前加一个换行符。'
-    });
+    // 如果有系统提示词，自动插入
+    if (model.systemPrompt) {
+      formatPrompts.unshift({
+        role: 'system',
+        content: model.systemPrompt
+      });
+    }
 
     // 获取 chatAPI
     const chatAPI = getOpenAIApi(userApiKey);
@@ -77,8 +77,9 @@ export default async function handler(req: NextApiRequest, res: NextApiResponse)
     );
     console.log(
       'response success',
-      `${(Date.now() - startTime) / 1000}s`,
-      formatPrompts.reduce((sum, item) => sum + item.content.length, 0)
+      `time: ${(Date.now() - startTime) / 1000}s`,
+      `promptLen: ${formatPrompts.length}`,
+      `contentLen: ${formatPrompts.reduce((sum, item) => sum + item.content.length, 0)}`
     );
 
     // 创建响应流