name

client/src/pages/api/app/modules/chat/gpt.ts

@@ -0,0 +1,265 @@
+// Next.js API route support: https://nextjs.org/docs/api-routes/introduction
+import type { NextApiRequest, NextApiResponse } from 'next';
+import { jsonRes, sseErrRes } from '@/service/response';
+import { sseResponse } from '@/service/utils/tools';
+import { OpenAiChatEnum } from '@/constants/model';
+import { adaptChatItem_openAI, countOpenAIToken } from '@/utils/plugin/openai';
+import { modelToolMap } from '@/utils/plugin';
+import { ChatContextFilter } from '@/service/utils/chat/index';
+import type { ChatItemType } from '@/types/chat';
+import { ChatRoleEnum, sseResponseEventEnum } from '@/constants/chat';
+import { parseStreamChunk, textAdaptGptResponse } from '@/utils/adapt';
+import { getOpenAIApi, axiosConfig } from '@/service/ai/openai';
+import { SpecificInputEnum } from '@/constants/app';
+import { getChatModel } from '@/service/utils/data';
+import { countModelPrice, pushTaskBillListItem } from '@/service/events/pushBill';
+import { authUser } from '@/service/utils/auth';
+
+export type Props = {
+  model: `${OpenAiChatEnum}`;
+  temperature?: number;
+  maxToken?: number;
+  history?: ChatItemType[];
+  userChatInput: string;
+  stream?: boolean;
+  quotePrompt?: string;
+  systemPrompt?: string;
+  limitPrompt?: string;
+  billId?: string;
+};
+export type Response = { [SpecificInputEnum.answerText]: string; totalTokens: number };
+
+export default async function handler(req: NextApiRequest, res: NextApiResponse) {
+  let { model, temperature = 0, stream } = req.body as Props;
+  try {
+    await authUser({ req, authRoot: true });
+
+    const response = await chatCompletion({
+      ...req.body,
+      res,
+      model
+    });
+
+    if (stream) {
+      sseResponse({
+        res,
+        event: sseResponseEventEnum.moduleFetchResponse,
+        data: JSON.stringify(response)
+      });
+      res.end();
+    } else {
+      jsonRes(res, {
+        data: response
+      });
+    }
+  } catch (err) {
+    if (stream) {
+      res.status(500);
+      sseErrRes(res, err);
+      res.end();
+    } else {
+      jsonRes(res, {
+        code: 500,
+        error: err
+      });
+    }
+  }
+}
+
+/* request openai chat */
+export async function chatCompletion({
+  res,
+  model,
+  temperature = 0,
+  maxToken = 4000,
+  stream = false,
+  history = [],
+  quotePrompt = '',
+  userChatInput,
+  systemPrompt = '',
+  limitPrompt = '',
+  billId
+}: Props & { res: NextApiResponse }): Promise<Response> {
+  // temperature adapt
+  const modelConstantsData = getChatModel(model);
+
+  if (!modelConstantsData) {
+    return Promise.reject('The chat model is undefined');
+  }
+
+  // FastGpt temperature range: 1~10
+  temperature = +(modelConstantsData.maxTemperature * (temperature / 10)).toFixed(2);
+
+  const messages: ChatItemType[] = [
+    ...(quotePrompt
+      ? [
+          {
+            obj: ChatRoleEnum.System,
+            value: quotePrompt
+          }
+        ]
+      : []),
+    ...(systemPrompt
+      ? [
+          {
+            obj: ChatRoleEnum.System,
+            value: systemPrompt
+          }
+        ]
+      : []),
+    ...history,
+    ...(limitPrompt
+      ? [
+          {
+            obj: ChatRoleEnum.Human,
+            value: limitPrompt
+          }
+        ]
+      : []),
+    {
+      obj: ChatRoleEnum.Human,
+      value: userChatInput
+    }
+  ];
+  const modelTokenLimit = getChatModel(model)?.contextMaxToken || 4000;
+
+  const filterMessages = ChatContextFilter({
+    model,
+    prompts: messages,
+    maxTokens: Math.ceil(modelTokenLimit - 300) // filter token. not response maxToken
+  });
+
+  const adaptMessages = adaptChatItem_openAI({ messages: filterMessages, reserveId: false });
+  const chatAPI = getOpenAIApi();
+
+  /* count response max token */
+  const promptsToken = modelToolMap.countTokens({
+    model,
+    messages: filterMessages
+  });
+  maxToken = maxToken + promptsToken > modelTokenLimit ? modelTokenLimit - promptsToken : maxToken;
+
+  const response = await chatAPI.createChatCompletion(
+    {
+      model,
+      temperature: Number(temperature || 0),
+      max_tokens: maxToken,
+      messages: adaptMessages,
+      // 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
+    },
+    {
+      timeout: stream ? 60000 : 480000,
+      responseType: stream ? 'stream' : 'json',
+      ...axiosConfig()
+    }
+  );
+
+  const { answer, totalTokens } = await (async () => {
+    if (stream) {
+      // sse response
+      const { answer } = await streamResponse({ res, response });
+      // count tokens
+      const finishMessages = filterMessages.concat({
+        obj: ChatRoleEnum.AI,
+        value: answer
+      });
+
+      const totalTokens = countOpenAIToken({
+        messages: finishMessages,
+        model: 'gpt-3.5-turbo-16k'
+      });
+
+      return {
+        answer,
+        totalTokens
+      };
+    } else {
+      const answer = stream ? '' : response.data.choices?.[0].message?.content || '';
+      const totalTokens = stream ? 0 : response.data.usage?.total_tokens || 0;
+
+      return {
+        answer,
+        totalTokens
+      };
+    }
+  })();
+
+  await pushTaskBillListItem({
+    billId,
+    moduleName: 'AI Chat',
+    amount: countModelPrice({ model, tokens: totalTokens }),
+    model: modelConstantsData.name,
+    tokenLen: totalTokens
+  });
+
+  return {
+    answerText: answer,
+    totalTokens
+  };
+}
+
+async function streamResponse({ res, response }: { res: NextApiResponse; response: any }) {
+  let answer = '';
+  let error: any = null;
+
+  const clientRes = async (data: string) => {
+    const { content = '' } = (() => {
+      try {
+        const json = JSON.parse(data);
+        const content: string = json?.choices?.[0].delta.content || '';
+        error = json.error;
+        answer += content;
+        return { content };
+      } catch (error) {
+        return {};
+      }
+    })();
+
+    if (res.closed || error) return;
+
+    if (data === '[DONE]') {
+      sseResponse({
+        res,
+        event: sseResponseEventEnum.answer,
+        data: textAdaptGptResponse({
+          text: null,
+          finish_reason: 'stop'
+        })
+      });
+      sseResponse({
+        res,
+        event: sseResponseEventEnum.answer,
+        data: '[DONE]'
+      });
+    } else {
+      sseResponse({
+        res,
+        event: sseResponseEventEnum.answer,
+        data: textAdaptGptResponse({
+          text: content
+        })
+      });
+    }
+  };
+
+  try {
+    for await (const chunk of response.data as any) {
+      if (res.closed) break;
+      const parse = parseStreamChunk(chunk);
+      parse.forEach((item) => clientRes(item.data));
+    }
+  } catch (error) {
+    console.log('pipe error', error);
+  }
+
+  if (error) {
+    console.log(error);
+    return Promise.reject(error);
+  }
+
+  return {
+    answer
+  };
+}