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server.ts
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server.ts
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import express, { Request, Response } from "express";
import cors, { CorsOptions } from "cors";
import cookieParser from "cookie-parser";
import nocache from "nocache";
import dotenv from "dotenv";
import { Server, Socket } from "socket.io";
import http from "http";
import path from "path";
import Ai from "openai";
import topicHelper from './topicHelper';
dotenv.config();
let { PORT, HOST, CLIENT_PORT, CLIENT_HOST, OPENAI_API, DOMAIN } = process.env;
const app = express();
const allowedOrigins = [
`http://${HOST}:${PORT}`,
`http://${CLIENT_HOST}:${CLIENT_PORT}`,
DOMAIN,
];
const corsOptions: CorsOptions = {
origin(requestOrigin, callback) {
if (!requestOrigin || allowedOrigins.includes(requestOrigin)) {
callback(null, true);
} else {
callback(new Error("Not allowed by CORS"));
}
},
methods: ["GET", "HEAD", "PUT", "PATCH", "POST", "DELETE", "OPTIONS"],
optionsSuccessStatus: 200,
credentials: true,
preflightContinue: true,
allowedHeaders: [
"Accept",
"Accept-Language",
"Content-Language",
"Content-Type",
"Authorization",
"Access-Control-Allow-Origin",
],
};
app.options("*", cors(corsOptions));
app.use(cors(corsOptions));
app.use(nocache());
app.use(express.json());
app.use(express.urlencoded({ extended: true }));
app.use(cookieParser());
app.use(
express.static(path.join(__dirname, "../client/dist"), { index: false })
);
app.get("*", (req, res) => {
res.sendFile(path.join(__dirname, "../client/dist/index.html"));
});
const server = http.createServer(app);
//socket io
const io = new Server(server, {
cors: corsOptions,
transports: ["websocket", "polling"],
allowEIO3: true,
});
async function generateQuestions() {
const ai = new Ai({
apiKey: OPENAI_API,
});
const topics = topicHelper();
try {
const content =
`Please provide a JSON stringfied array of 5 quiz response with properties - {question: question string, a: option a string, b: option b string, c: option c string, d: option d string, answer: option string}\n
* Important instructions are mentioned below - \n
* Each question should be from these topics - ${topics}.\n
* Make sure you only respond with the JSON stringfied data with the format I mentioned above, because I will directly JSON-parse it and I dont want convertion errors.\n
* Be interconnected and Do not send duplicate questions.\n
* Do not send any text other than the quizz object.\n
`;
const chatCompletion = await ai.chat.completions.create({
messages: [{ role: "system", content }],
model: "gpt-3.5-turbo-0125",
});
if (chatCompletion?.choices[0]?.message?.content) {
return JSON.parse(chatCompletion.choices[0].message.content);
} else return null;
} catch (error) {
console.error(error);
return null;
}
}
interface Game {
started: boolean;
score: number;
attempt: number;
}
const game = <Record<string, Record<string, Game>>>{};
io.on("connection", async (socket: Socket) => {
try {
//join room
socket.on("joinID", () => {
let ID;
do {
ID = Math.floor(Math.random() * 1e10)
.toString()
.padStart(10, "0");
} while (io.of("/").adapter.rooms.has(ID));
socket.join(ID);
io.to(ID).emit("recieveID", ID);
});
//leave room
socket.on("leaveID", (ID: string) => {
socket.leave(ID);
});
//send request
socket.on("sendRequest", (data: { ID: string; friend: string }) => {
if (data.friend !== null) {
if (io.of("/").adapter.rooms.has(data.friend) && data.ID !== data.friend) {
io.to(data.friend).emit("receiveRequest", data.ID);
} else {
io.to(data.ID).emit("receiveAlert", 404);
}
return;
}
io.of("/").adapter.rooms.forEach((_, key) => {
if (key !== data.ID && Number(key)) {
io.to(key).emit("receiveRequest", data.ID);
}
});
});
//accepting request
socket.on("acceptRequest", (data: { from: string; to: string }) => {
if (
io.of("/").adapter.rooms.has(data.from) &&
io.of("/").adapter.rooms.has(data.to)
) {
game[data.from] = {
[data.from]: { score: 0, attempt: 0, started: false },
[data.to]: { score: 0, attempt: 0, started: false },
};
game[data.to] = game[data.from];
io.to(data.to).emit("receiveAccept", data.from);
}
});
//ready to start
socket.on("sendStart", (data: { from: string; to: string }) => {
game[data.from][data.from].started = true;
if (game[data.from][data.to].started === true) {
generateQuestions().then((res) => {
if (res !== null) {
io.to([data.to, data.from]).emit("receiveQuestions", res);
}
});
}
});
//score and attempt
socket.on("sendScore", (data: { scored: boolean; from: string; to: string }) => {
game[data.from][data.from].score += Number(data.scored);
game[data.from][data.from].attempt++;
io.to([data.from, data.to]).emit("receiveScore", game[data.from]);
});
socket.on("alertExit", (data: { from: string; to: string }) => {
if (data.from && data.to) {
io.to(data.to).emit("receiveExit", data.from);
}
});
} catch (error) {
console.error(error);
}
});
//server running
server.listen(
typeof PORT === "number" ? PORT : 8080,
HOST ?? "0.0.0.0",
() => {
console.log(`Server listening at http://${HOST}:${PORT}`);
}
);