nextjs transition and fly server

Author: mcantillon21

.gitignore

@@ -137,3 +137,4 @@ dmypy.json
 
 vectorstore.pkl
 langchain.readthedocs.io/
+.vercel

Procfile

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+# Modify this Procfile to fit your needs
+web: uvicorn main:app --host 0.0.0.0 --port 8080

chat-langchain/.eslintrc.json

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+{
+  "extends": "next/core-web-vitals"
+}

chat-langchain/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# local env files
+.env*.local
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts

chat-langchain/README.md

@@ -0,0 +1,34 @@
+This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).
+
+## Getting Started
+
+First, run the development server:
+
+```bash
+npm run dev
+# or
+yarn dev
+# or
+pnpm dev
+```
+
+Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
+
+You can start editing the page by modifying `app/page.tsx`. The page auto-updates as you edit the file.
+
+This project uses [`next/font`](https://nextjs.org/docs/basic-features/font-optimization) to automatically optimize and load Inter, a custom Google Font.
+
+## Learn More
+
+To learn more about Next.js, take a look at the following resources:
+
+- [Next.js Documentation](https://nextjs.org/docs) - learn about Next.js features and API.
+- [Learn Next.js](https://nextjs.org/learn) - an interactive Next.js tutorial.
+
+You can check out [the Next.js GitHub repository](https://github.com/vercel/next.js/) - your feedback and contributions are welcome!
+
+## Deploy on Vercel
+
+The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/new?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
+
+Check out our [Next.js deployment documentation](https://nextjs.org/docs/deployment) for more details.

chat-langchain/app/components/chat.tsx

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+"use client";
+import React, { useEffect, useRef, useState } from "react";
+
+const Chat = () => {
+  const [messages, setMessages] = useState<
+    Array<{ sender: string; message: string; isCode: boolean }>
+  >([]);
+  const [model, setModel] = useState("openai");
+  const messagesEndRef = useRef<HTMLDivElement>(null);
+  const [message, setMessage] = useState(""); // Add this line
+
+  const sendMessage = (event: { preventDefault: () => void }) => {
+    event.preventDefault();
+    if (message === "") {
+      return;
+    }
+    let isCode = false;
+
+    fetch("http://0.0.0.0:8080/chat", {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+      },
+      body: JSON.stringify({
+        message: message,
+        model: model,
+      }),
+    })
+      .then((response) => {
+        const reader = response.body.getReader();
+        const decoder = new TextDecoder("utf-8");
+
+        let accumulatedMessage = "";
+        let prevIsCode = null;
+
+        reader
+          .read()
+          .then(function processText({
+            done,
+            value,
+          }: {
+            done: any;
+            value: any;
+          }) {
+            if (done) {
+              console.log("Stream complete");
+              return;
+            }
+
+            let result = decoder.decode(value);
+            if (result.includes("``")) {
+              isCode = !isCode;
+            } else {
+              result = result.replace(/`/g, "");
+              accumulatedMessage += result;
+            }
+
+            setMessages((prevMessages) => {
+              let newMessages = [...prevMessages];
+              if (isCode !== prevIsCode) {
+                newMessages.push({
+                  sender: isCode ? "" : "Bot",
+                  message: accumulatedMessage.trim(),
+                  isCode: isCode,
+                });
+                if (newMessages.length > 1) {
+                  accumulatedMessage = "";
+                }
+              } else if (newMessages.length > 0) {
+                newMessages[newMessages.length - 1] = {
+                  sender: isCode ? "" : "Bot",
+                  message: accumulatedMessage.trim(),
+                  isCode: isCode,
+                };
+              }
+              prevIsCode = isCode;
+              return newMessages;
+            });
+            setMessage("");
+            return reader.read().then(processText);
+          });
+      })
+      .catch((error) => {
+        console.error("Error:", error);
+      });
+  };
+
+  useEffect(() => {
+    messagesEndRef.current?.scrollIntoView({ behavior: "smooth" });
+  }, [messagesEndRef]);
+
+  return (
+    <div className="rounded-2xl border-zinc-100  lg:border lg:p-6 bg-slate-200">
+      <div className="w-full mb-5 rounded-lg px-4 py-5 shadow-lg ring-1 ring-zinc-100 sm:px-6 bg-slate-100">
+        <h4 className="text-center text-3xl font-sans font-medium">
+          Chat Langchain
+        </h4>
+        <span className="mx-auto flex font-mono flex-grow text-gray-400 clear-both mb-5 mt-1 text-sm justify-center">
+          A chatbot for everything Langchain.
+        </span>
+        <hr className="border-gray-500 my-5" />
+        <div
+          id="messages"
+          className="overflow-auto m-8"
+          style={{ maxHeight: "500px" }}
+        >
+          {messages.map((msg, index) => (
+            <div
+              key={index}
+              className={`flex ${
+                msg.sender === "You" ? "justify-end" : "justify-start"
+              }`}
+            >
+              <div
+                className={
+                  msg.sender === "You" ? "client-message" : "server-message"
+                }
+              >
+                {msg.sender && <strong>{msg.sender}: </strong>}
+                {msg.isCode ? (
+                  <code
+                    style={{
+                      color: "white",
+                      backgroundColor: "rgba(0, 0, 0, 0.8)",
+                      opacity: "0.9",
+                      padding: "4px",
+                      margin: "4px",
+                      borderRadius: "5px",
+                      overflow: "auto",
+                      boxShadow: "0px 0px 10px rgba(0, 0, 0, 0.5))",
+                      transition: "ease-in-out 0.15s",
+                    }}
+                    dangerouslySetInnerHTML={{ __html: msg.message }}
+                  ></code>
+                ) : (
+                  msg.message
+                )}
+              </div>
+            </div>
+          ))}
+          <div ref={messagesEndRef} />
+        </div>
+        <form className="flex justify-between mt-5" onSubmit={sendMessage}>
+          <input
+            type="text"
+            className="w-4/5 bg-gray-800 text-white rounded p-2 mr-2"
+            placeholder="Write your question"
+            id="messageText"
+            value={message}
+            onChange={(e) => setMessage(e.target.value)}
+          />
+          <select
+            id="modelType"
+            className="w-1/5 bg-gray-800 text-white rounded p-2 mr-2"
+            value={model}
+            onChange={(e) => setModel(e.target.value)}
+          >
+            <option value="openai">OpenAI</option>
+            <option value="anthropic">Anthropic</option>
+          </select>
+          <button
+            id="send"
+            type="submit"
+            className="bg-blue-500 text-white rounded p-2"
+          >
+            Send
+          </button>
+        </form>
+      </div>
+    </div>
+  );
+};
+
+export default Chat;

chat-langchain/app/favicon.ico

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+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+:root {
+  --foreground-rgb: 0, 0, 0;
+  --background-start-rgb: 214, 219, 220;
+  --background-end-rgb: 255, 255, 255;
+}
+
+@media (prefers-color-scheme: dark) {
+  :root {
+    --foreground-rgb: 255, 255, 255;
+    --background-start-rgb: 0, 0, 0;
+    --background-end-rgb: 0, 0, 0;
+  }
+}
+
+body {
+  color: rgb(var(--foreground-rgb));
+  background: linear-gradient(
+      to bottom,
+      transparent,
+      rgb(var(--background-end-rgb))
+    )
+    rgb(var(--background-start-rgb));
+}

chat-langchain/app/globals.css

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+import './globals.css'
+import type { Metadata } from 'next'
+import { Inter } from 'next/font/google'
+
+const inter = Inter({ subsets: ['latin'] })
+
+export const metadata: Metadata = {
+  title: 'Create Next App',
+  description: 'Generated by create next app',
+}
+
+export default function RootLayout({
+  children,
+}: {
+  children: React.ReactNode
+}) {
+  return (
+    <html lang="en">
+      <body className={inter.className}>{children}</body>
+    </html>
+  )
+}

chat-langchain/app/layout.tsx

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+import Image from 'next/image'
+import axios from 'axios'
+import Chat from "../app/components/chat"
+
+export default function Home() {
+  return (
+    <main className="flex min-h-screen flex-col items-center justify-between p-24 bg-white">
+      <div className="z-10 max-w-5xl w-full items-center justify-between font-light text-sm lg:flex">
+        <Chat/>
+      </div>
+    </main>
+  )
+}
+
+

chat-langchain/app/page.tsx

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+/** @type {import('next').NextConfig} */
+const nextConfig = {}
+
+module.exports = nextConfig