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server.ts
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server.ts
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import * as dotenv from "dotenv";
import { ChatOpenAI } from "langchain/chat_models/openai";
import { HumanChatMessage } from "langchain/schema";
import express from "express";
import cors from "cors";
dotenv.config();
const app = express();
app.use(cors({ origin: "*" }));
app.get("/chat", async (req, res) => {
const message = req.query.message;
if (typeof message === "string" && message) {
// To stream the response we need access to the Response object.
// For this reason we need to create a new ChatOpenAI instance
// for each request.
const chat = new ChatOpenAI({
temperature: 0.9,
openAIApiKey: process.env.OPENAI_API_KEY,
streaming: true,
callbacks: [
{
handleLLMNewToken(token: string) {
console.log("New token:", token);
res.write(token);
},
},
],
});
// We need to await the call to ensure that the
// connection is closed after the whole response
// is sent.
await chat.call([new HumanChatMessage(message)]);
res.end();
} else {
res.json({ error: "No message provided" });
}
});
app.get("/", (req, res) => {
res.redirect("http://localhost:3000");
});
app.listen(3333, () => {
console.log("Server running on http://localhost:3333");
});