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server.js
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@@ -1,150 +0,0 @@
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import Koa from "koa";
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import Router from "@koa/router";
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import compose from "koa-compose";
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import { koaBody } from "koa-body";
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import {
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handleTimeStap,
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handleBase64,
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handleNewSession,
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handleErrors,
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initParams,
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} from "./handles.js";
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import https from "https";
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import { createParser } from "eventsource-parser";
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const app = new Koa();
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const router = new Router();
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const params = {};
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const break_message = {
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answer_message_id: null,
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query_message_id: null,
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scene: params.scene,
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broken_pos: 0,
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conversation_id: params.conversation_id,
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local_message_id: params.local_message_id,
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};
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const createNewSession = async (ctx, next) => {
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const { messages } = ctx.request.body;
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const sessionid = ctx.req.headers.authorization.split(" ")[1];
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if (
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messages[0].role === "system" &&
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messages.length === 2 &&
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break_message.answer_message_id !== null &&
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break_message.query_message_id !== null
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) {
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console.log("new session");
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await handleNewSession(break_message, sessionid);
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params.conversation_id =
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"7337495393033765890_7337496580645339154_2_" + handleTimeStap();
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params.local_message_id = handleBase64();
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}
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await next();
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};
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// 事件源路由
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router.post("/api/v1/chat/completions", async (ctx) => {
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ctx.respond = false;
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ctx.type = "text/event-stream";
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ctx.status = 200;
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// 初始化响应头 sse
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ctx.set({
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"Cache-Control": "no-cache",
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Connection: "keep-alive",
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"Content-Encoding": "none",
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});
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// 获取 post 请求的 body
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const { messages, model } = ctx.request.body;
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const sessionid = ctx.req.headers.authorization.split(" ")[1];
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// 返回的数据
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const sseData = {
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id: null,
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object: "chat.completion.chunk",
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created: handleTimeStap(),
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model: model,
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system_fingerprint: null,
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choices: [
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{
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index: 0,
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delta: { content: null },
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logprobs: null,
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finish_reason: null,
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},
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],
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};
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// 远程服务器配置
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const options = {
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hostname: "www.coze.com",
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path: "/api/conversation/chat",
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port: 443,
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method: "POST",
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headers: {
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"Content-Type": "application/json",
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Cookie: `sessionid=${sessionid}`,
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"User-Agent":
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"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36",
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},
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};
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params.query = messages[messages.length - 1].content;
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const sse = https.request(options);
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sse.on("response", async (res) => {
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const parser = createParser((event) => {
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if (event.event === "message") {
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const data = JSON.parse(event.data);
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if (data.message.type === "answer") {
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sseData.id = data.conversation_id;
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sseData.choices[0].delta.content = data.message.content;
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if (data.is_finish) {
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sseData.choices[0].finish_reason = "stop";
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} else {
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sseData.choices[0].finish_reason = null;
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}
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ctx.res.write(`data:${JSON.stringify(sseData)}\n\n`);
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if (data.is_finish) {
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break_message.answer_message_id = data.message.reply_id;
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break_message.query_message_id = data.message.message_id;
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break_message.broken_pos = parseInt(
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data.message.extra_info.output_tokens
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);
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ctx.res.end();
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}
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}
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}
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});
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res.setEncoding("utf8");
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res.on("data", (d) => {
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parser.feed(d);
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});
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res.on("end", () => {
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console.log("response end", new Date().toLocaleString());
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});
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});
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sse.on("error", async (e) => {
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console.error(`problem with request: ${e.message}`);
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});
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sse.on("close", async () => {
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console.log("sse closed", new Date().toLocaleString());
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});
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sse.write(JSON.stringify(params));
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sse.end();
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ctx.respond = false;
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});
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// 组合中间件
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const all = compose([
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handleErrors,
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koaBody(),
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createNewSession,
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router.routes(),
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router.allowedMethods(),
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]);
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// 注册中间件
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app.use(all);
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// 启动Koa应用
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app.listen(3000, () => {
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console.log("Server started on port 3000");
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initParams(params);
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});
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