feat: gpt3流响应

2025-07-22 20:37:48 +00:00 · 2023-03-25 20:43:03 +08:00
parent 6bba859060
commit 274ece1d91
12 changed files with 163 additions and 76 deletions
--- a/src/constants/common.ts
+++ b/src/constants/common.ts
@@ -3,6 +3,8 @@ export enum EmailTypeEnum {
  findPassword = 'findPassword'
 }

+export const PRICE_SCALE = 100000;
+
 export const introPage = `
 ## 欢迎使用 Fast GPT

--- a/src/pages/api/chat/chatGpt.ts
+++ b/src/pages/api/chat/chatGpt.ts
@@ -89,6 +89,8 @@ export default async function handler(req: NextApiRequest, res: NextApiResponse)
        temperature: temperature,
        // max_tokens: modelConstantsData.maxToken,
        messages: formatPrompts,
+        frequency_penalty: 0.5, // 越大，重复内容越少
+        presence_penalty: -0.5, // 越大，越容易出现新内容
        stream: true
      },
      {
@@ -117,7 +119,8 @@ export default async function handler(req: NextApiRequest, res: NextApiResponse)
      try {
        const json = JSON.parse(data);
        const content: string = json?.choices?.[0].delta.content || '';
-        if (!content) return;
+        if (!content || (responseContent === '' && content === '\n')) return;
+
        responseContent += content;
        // console.log('content:', content)
        !stream.destroyed && stream.push(content.replace(/\n/g, '<br/>'));
@@ -144,7 +147,6 @@ export default async function handler(req: NextApiRequest, res: NextApiResponse)
    stream.destroy();

    const promptsContent = formatPrompts.map((item) => item.content).join('');
-    console.log(`responseLen: ${responseContent.length}`, `promptLen: ${promptsContent.length}`);
    // 只有使用平台的 key 才计费
    !userApiKey &&
      pushBill({
--- a/src/pages/api/chat/gpt3.ts
+++ b/src/pages/api/chat/gpt3.ts
@@ -1,20 +1,38 @@
-// Next.js API route support: https://nextjs.org/docs/api-routes/introduction
 import type { NextApiRequest, NextApiResponse } from 'next';
-import { jsonRes } from '@/service/response';
+import { createParser, ParsedEvent, ReconnectInterval } from 'eventsource-parser';
 import { connectToDatabase } from '@/service/mongo';
 import { getOpenAIApi, authChat } from '@/service/utils/chat';
-import { ChatItemType } from '@/types/chat';
 import { httpsAgent } from '@/service/utils/tools';
+import { ChatItemType } from '@/types/chat';
+import { jsonRes } from '@/service/response';
+import type { ModelSchema } from '@/types/mongoSchema';
+import { PassThrough } from 'stream';
 import { modelList } from '@/constants/model';
 import { pushBill } from '@/service/events/pushChatBill';

 /* 发送提示词 */
 export default async function handler(req: NextApiRequest, res: NextApiResponse) {
-  try {
-    const { prompt, chatId } = req.body as { prompt: ChatItemType[]; chatId: string };
-    const { authorization } = req.headers;
+  let step = 0; // step=1时，表示开始了流响应
+  const stream = new PassThrough();
+  stream.on('error', () => {
+    console.log('error: ', 'stream error');
+    stream.destroy();
+  });
+  res.on('close', () => {
+    stream.destroy();
+  });
+  res.on('error', () => {
+    console.log('error: ', 'request error');
+    stream.destroy();
+  });

-    if (!prompt || !chatId) {
+  try {
+    const { chatId, prompt } = req.body as {
+      prompt: ChatItemType;
+      chatId: string;
+    };
+    const { authorization } = req.headers;
+    if (!chatId || !prompt) {
      throw new Error('缺少参数');
    }

@@ -22,13 +40,29 @@ export default async function handler(req: NextApiRequest, res: NextApiResponse)

    const { chat, userApiKey, systemKey, userId } = await authChat(chatId, authorization);

-    const model = chat.modelId;
+    const model: ModelSchema = chat.modelId;

-    // 获取 chatAPI
-    const chatAPI = getOpenAIApi(userApiKey || systemKey);
+    // 读取对话内容
+    const prompts = [...chat.content, prompt];

-    // prompt处理
-    const formatPrompts = prompt.map((item) => `${item.value}\n\n###\n\n`).join('');
+    // 上下文长度过滤
+    const maxContext = model.security.contextMaxLen;
+    const filterPrompts =
+      prompts.length > maxContext ? prompts.slice(prompts.length - maxContext) : prompts;
+
+    // 格式化文本内容
+    const map = {
+      Human: 'Human',
+      AI: 'AI',
+      SYSTEM: 'SYSTEM'
+    };
+    const formatPrompts: string[] = filterPrompts.map((item: ChatItemType) => item.value);
+    // 如果有系统提示词，自动插入
+    if (model.systemPrompt) {
+      formatPrompts.unshift(`${model.systemPrompt}`);
+    }
+
+    const promptText = formatPrompts.join('</s>');

    // 计算温度
    const modelConstantsData = modelList.find((item) => item.model === model.service.modelName);
@@ -37,42 +71,95 @@ export default async function handler(req: NextApiRequest, res: NextApiResponse)
    }
    const temperature = modelConstantsData.maxTemperature * (model.temperature / 10);

-    // 发送请求
-    const response = await chatAPI.createCompletion(
+    // 获取 chatAPI
+    const chatAPI = getOpenAIApi(userApiKey || systemKey);
+    let startTime = Date.now();
+
+    // 发出请求
+    const chatResponse = await chatAPI.createCompletion(
      {
-        model: model.service.modelName,
-        prompt: formatPrompts,
+        model: model.service.chatModel,
        temperature: temperature,
-        // max_tokens: modelConstantsData.maxToken,
-        top_p: 1,
-        frequency_penalty: 0,
-        presence_penalty: 0.6,
-        stop: ['###']
+        prompt: promptText,
+        stream: true,
+        max_tokens: modelConstantsData.maxToken,
+        presence_penalty: 0, // 越大，越容易出现新内容
+        frequency_penalty: 0, // 越大，重复内容越少
+        stop: ['。！？.!.', `</s>`]
      },
      {
+        timeout: 40000,
+        responseType: 'stream',
        httpsAgent
      }
    );

-    const responseContent = response.data.choices[0]?.text || '';
+    console.log('api response time:', `${(Date.now() - startTime) / 1000}s`);
+
+    // 创建响应流
+    res.setHeader('Content-Type', 'text/event-stream;charset-utf-8');
+    res.setHeader('Access-Control-Allow-Origin', '*');
+    res.setHeader('X-Accel-Buffering', 'no');
+    res.setHeader('Cache-Control', 'no-cache, no-transform');
+    step = 1;
+
+    let responseContent = '';
+    stream.pipe(res);
+
+    const onParse = async (event: ParsedEvent | ReconnectInterval) => {
+      if (event.type !== 'event') return;
+      const data = event.data;
+      if (data === '[DONE]') return;
+      try {
+        const json = JSON.parse(data);
+        const content: string = json?.choices?.[0].text || '';
+        if (!content || (responseContent === '' && content === '\n')) return;
+
+        responseContent += content;
+        // console.log('content:', content);
+        !stream.destroyed && stream.push(content.replace(/\n/g, '<br/>'));
+      } catch (error) {
+        error;
+      }
+    };
+
+    const decoder = new TextDecoder();
+    try {
+      for await (const chunk of chatResponse.data as any) {
+        if (stream.destroyed) {
+          // 流被中断了，直接忽略后面的内容
+          break;
+        }
+        const parser = createParser(onParse);
+        parser.feed(decoder.decode(chunk));
+      }
+    } catch (error) {
+      console.log('pipe error', error);
+    }
+    // close stream
+    !stream.destroyed && stream.push(null);
+    stream.destroy();

-    console.log(`responseLen: ${responseContent.length}`, `promptLen: ${formatPrompts.length}`);
    // 只有使用平台的 key 才计费
    !userApiKey &&
      pushBill({
        modelName: model.service.modelName,
        userId,
        chatId,
-        text: formatPrompts + responseContent
+        text: promptText + responseContent
      });
-
-    jsonRes(res, {
-      data: responseContent
-    });
  } catch (err: any) {
-    jsonRes(res, {
-      code: 500,
-      error: err
-    });
+    // console.log(err?.response);
+    if (step === 1) {
+      // 直接结束流
+      console.log('error，结束');
+      stream.destroy();
+    } else {
+      res.status(500);
+      jsonRes(res, {
+        code: 500,
+        error: err
+      });
+    }
  }
 }
--- a/src/pages/api/user/getPayCode.ts
+++ b/src/pages/api/user/getPayCode.ts
@@ -5,7 +5,7 @@ import axios from 'axios';
 import { authToken } from '@/service/utils/tools';
 import { customAlphabet } from 'nanoid';
 import { connectToDatabase, Pay } from '@/service/mongo';
-import { PRICE_SCALE } from '@/utils/user';
+import { PRICE_SCALE } from '@/constants/common';

 const nanoid = customAlphabet('abcdefghijklmnopqrstuvwxyz1234567890', 20);

--- a/src/pages/chat/index.tsx
+++ b/src/pages/chat/index.tsx
@@ -197,16 +197,22 @@ const Chat = ({ chatId }: { chatId: string }) => {
    [chatId]
  );

-  // chatGPT
-  const chatGPTPrompt = useCallback(
-    async (newChatList: ChatSiteItemType[]) => {
+  // gpt 对话
+  const gptChatPrompt = useCallback(
+    async (prompts: ChatSiteItemType) => {
+      const urlMap: Record<string, string> = {
+        [ChatModelNameEnum.GPT35]: '/api/chat/chatGpt',
+        [ChatModelNameEnum.GPT3]: '/api/chat/gpt3'
+      };
+      if (!urlMap[chatData.chatModel]) return Promise.reject('找不到模型');
+
      const prompt = {
-        obj: newChatList[newChatList.length - 1].obj,
-        value: newChatList[newChatList.length - 1].value
+        obj: prompts.obj,
+        value: prompts.value
      };
      // 流请求，获取数据
      const res = await streamFetch({
-        url: '/api/chat/chatGpt',
+        url: urlMap[chatData.chatModel],
        data: {
          prompt,
          chatId
@@ -240,7 +246,7 @@ const Chat = ({ chatId }: { chatId: string }) => {
        });
      } catch (err) {
        toast({
-          title: '存储对话出现异常, 继续对话会导致上下文丢失，请刷新页面',
+          title: '对话出现异常, 继续对话会导致上下文丢失，请刷新页面',
          status: 'warning',
          duration: 3000,
          isClosable: true
@@ -259,7 +265,7 @@ const Chat = ({ chatId }: { chatId: string }) => {
        })
      }));
    },
-    [chatId, toast]
+    [chatData.chatModel, chatId, toast]
  );

  /**
@@ -272,7 +278,7 @@ const Chat = ({ chatId }: { chatId: string }) => {
      .trim()
      .split('\n')
      .filter((val) => val)
-      .join('\n\n');
+      .join('\n');
    if (!chatData?.modelId || !val || !ChatBox.current || isChatting) {
      return;
    }
@@ -301,22 +307,8 @@ const Chat = ({ chatId }: { chatId: string }) => {
    resetInputVal('');
    scrollToBottom();

-    const fnMap: { [key: string]: any } = {
-      [ChatModelNameEnum.GPT35]: chatGPTPrompt,
-      [ChatModelNameEnum.GPT3]: gpt3ChatPrompt
-    };
-
    try {
-      /* 对长度进行限制 */
-      const maxContext = chatData.secret.contextMaxLen;
-      const requestPrompt =
-        newChatList.length > maxContext + 1
-          ? newChatList.slice(newChatList.length - maxContext - 1, -1)
-          : newChatList.slice(0, -1);
-
-      if (typeof fnMap[chatData.chatModel] === 'function') {
-        await fnMap[chatData.chatModel](requestPrompt);
-      }
+      await gptChatPrompt(newChatList[newChatList.length - 2]);

      // 如果是 Human 第一次发送，插入历史记录
      const humanChat = newChatList.filter((item) => item.obj === 'Human');
@@ -343,15 +335,12 @@ const Chat = ({ chatId }: { chatId: string }) => {
    }
  }, [
    inputVal,
-    chatData.modelId,
+    chatData?.modelId,
    chatData.history,
-    chatData.secret.contextMaxLen,
-    chatData.chatModel,
    isChatting,
    resetInputVal,
    scrollToBottom,
-    chatGPTPrompt,
-    gpt3ChatPrompt,
+    gptChatPrompt,
    pushChatHistory,
    chatId,
    toast
--- a/src/pages/model/components/CreateModel.tsx
+++ b/src/pages/model/components/CreateModel.tsx
@@ -34,6 +34,7 @@ const CreateModel = ({
  onSuccess: Dispatch<ModelSchema>;
 }) => {
  const [requesting, setRequesting] = useState(false);
+  const [refresh, setRefresh] = useState(false);
  const toast = useToast({
    duration: 2000,
    position: 'top'
@@ -95,7 +96,10 @@ const CreateModel = ({
              <Select
                placeholder="选择基础模型类型"
                {...register('serviceModelName', {
-                  required: '底层模型不能为空'
+                  required: '底层模型不能为空',
+                  onChange() {
+                    setRefresh(!refresh);
+                  }
                })}
              >
                {modelList.map((item) => (
@@ -110,8 +114,9 @@ const CreateModel = ({
            </FormControl>
            <Box mt={3} textAlign={'center'} fontSize={'sm'} color={'blackAlpha.600'}>
              {formatPrice(
-                modelList.find((item) => item.model === getValues('serviceModelName'))?.price || 0
-              ) * 1000}
+                modelList.find((item) => item.model === getValues('serviceModelName'))?.price || 0,
+                1000
+              )}
              元/1K tokens(包括上下文和标点符号)
            </Box>
          </ModalBody>
--- a/src/pages/number/components/PayModal.tsx
+++ b/src/pages/number/components/PayModal.tsx
@@ -107,7 +107,7 @@ const PayModal = ({ onClose }: { onClose: () => void }) => {
                      {modelList.map((item, i) => (
                        <Tr key={item.model}>
                          <Td>{item.name}</Td>
-                          <Td>{formatPrice(item.price) * 1000}</Td>
+                          <Td>{formatPrice(item.price, 1000)}</Td>
                        </Tr>
                      ))}
                    </Tbody>
--- a/src/service/events/pushChatBill.ts
+++ b/src/service/events/pushChatBill.ts
@@ -28,7 +28,9 @@ export const pushBill = async ({

    // 计算价格
    const price = unitPrice * tokens.length;
-    console.log('token len:', tokens.length, 'price: ', `${formatPrice(price)}元`);
+    console.log('token len:', tokens.length);
+    console.log('text len: ', text.length);
+    console.log('price: ', `${formatPrice(price)}元`);

    try {
      // 插入 Bill 记录
--- a/src/service/models/model.ts
+++ b/src/service/models/model.ts
@@ -39,9 +39,9 @@ const ModelSchema = new Schema({
  },
  temperature: {
    type: Number,
-    min: 1,
+    min: 0,
    max: 10,
-    default: 5
+    default: 4
  },
  service: {
    company: {
--- a/src/service/models/user.ts
+++ b/src/service/models/user.ts
@@ -1,6 +1,6 @@
 import { Schema, model, models } from 'mongoose';
 import { hashPassword } from '@/service/utils/tools';
-import { PRICE_SCALE } from '@/utils/user';
+import { PRICE_SCALE } from '@/constants/common';

 const UserSchema = new Schema({
  email: {
--- a/src/service/response.ts
+++ b/src/service/response.ts
@@ -28,11 +28,11 @@ export const jsonRes = <T = any>(
    } else if (openaiError[error?.response?.statusText]) {
      msg = openaiError[error.response.statusText];
    }
-    // console.log(error?.response);
    console.log('error->');
    console.log('code:', error.code);
    console.log('statusText:', error?.response?.statusText);
    console.log('msg:', msg);
+    error?.response && console.log('chat err:', error?.response);
  }

  res.json({
--- a/src/utils/user.ts
+++ b/src/utils/user.ts
@@ -1,5 +1,5 @@
+import { PRICE_SCALE } from '@/constants/common';
 const tokenKey = 'fast-gpt-token';
-export const PRICE_SCALE = 100000;

 export const setToken = (val: string) => {
  localStorage.setItem(tokenKey, val);
@@ -14,6 +14,6 @@ export const clearToken = () => {
 /**
 * 把数据库读取到的price，转化成元
 */
-export const formatPrice = (val: number) => {
-  return val / PRICE_SCALE;
+export const formatPrice = (val: number, multiple = 1) => {
+  return Number(((val / PRICE_SCALE) * multiple).toFixed(10));
 };