95 行
2.6 KiB
TypeScript
95 行
2.6 KiB
TypeScript
import Koa, {Context, Next} from 'koa';
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import Router from 'koa-router'
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import bodyParser from 'koa-bodyparser';
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import {ChatModelFactory, Site} from "./model";
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import dotenv from 'dotenv';
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import {ChatRequest, ChatResponse, ModelType, PromptToString} from "./model/base";
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import {Event, EventStream} from "./utils";
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dotenv.config();
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const app = new Koa();
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const router = new Router();
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const errorHandler = async (ctx: Context, next: Next) => {
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try {
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await next();
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} catch (err: any) {
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console.error(err);
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ctx.body = JSON.stringify(err);
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ctx.res.end();
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}
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};
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app.use(errorHandler);
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app.use(bodyParser());
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const chatModel = new ChatModelFactory();
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interface AskReq extends ChatRequest {
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site: Site;
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}
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interface AskRes extends ChatResponse {
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}
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router.get('/ask', async (ctx) => {
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const {prompt, model = ModelType.GPT3p5Turbo, site = Site.You} = ctx.query as unknown as AskReq;
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if (!prompt) {
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ctx.body = {error: `need prompt in query`} as AskRes;
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return;
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}
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const chat = chatModel.get(site);
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if (!chat) {
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ctx.body = {error: `not support site: ${site} `} as AskRes;
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return;
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}
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const tokenLimit = chat.support(model);
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if (!tokenLimit) {
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ctx.body = {error: `${site} not support model ${model}`} as AskRes;
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return;
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}
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ctx.body = await chat.ask({prompt: PromptToString(prompt, tokenLimit), model});
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});
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router.get('/ask/stream', async (ctx) => {
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const {prompt, model = ModelType.GPT3p5Turbo, site = Site.You} = ctx.query as unknown as AskReq;
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ctx.set({
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"Content-Type": "text/event-stream;charset=utf-8",
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"Cache-Control": "no-cache",
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"Connection": "keep-alive",
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});
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const es = new EventStream();
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ctx.body = es.stream();
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if (!prompt) {
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es.write(Event.error, {error: 'need prompt in query'})
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es.end();
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return;
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}
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const chat = chatModel.get(site);
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if (!chat) {
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es.write(Event.error, {error: `not support site: ${site} `})
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es.end();
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return;
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}
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const tokenLimit = chat.support(model);
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if (!tokenLimit) {
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es.write(Event.error, {error: `${site} not support model ${model}`})
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es.end();
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return;
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}
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await chat.askStream({prompt: PromptToString(prompt, tokenLimit), model}, es);
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ctx.body = es.stream();
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})
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app.use(router.routes());
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(async () => {
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const server = app.listen(3000, () => {
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console.log("Now listening: 127.0.0.1:3000");
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});
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process.on('SIGINT', () => {
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server.close(() => {
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process.exit(0);
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});
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});
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})()
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