EvalueTonSavoir/quizRoom/socket/setupWebSocket.ts

import { Server, Socket } from "socket.io";
import os from "os";

const MAX_USERS_PER_ROOM = 60;
const MAX_TOTAL_CONNECTIONS = 2000;

export const setupWebsocket = (io: Server): void => {
  let totalConnections = 0;

  io.on("connection", (socket: Socket) => {
    if (totalConnections >= MAX_TOTAL_CONNECTIONS) {
      console.log("Connection limit reached. Disconnecting client.");
      socket.emit("join-failure", "Le nombre maximum de connexions a été atteint");
      socket.disconnect(true);
      return;
    }

    totalConnections++;
    console.log("A user connected:", socket.id, "| Total connections:", totalConnections);

    socket.on("create-room", (sentRoomName) => {
      // Ensure sentRoomName is a string before applying toUpperCase()
      const roomName = (typeof sentRoomName === "string" && sentRoomName.trim() !== "")
        ? sentRoomName.toUpperCase()
        : generateRoomName();

      console.log(`Created room with name: ${roomName}`);
      if (!io.sockets.adapter.rooms.get(roomName)) {
        socket.join(roomName);
        socket.emit("create-success", roomName);
      } else {
        socket.emit("create-failure");
      }
    });

    socket.on("join-room", ({ enteredRoomName, username }: { enteredRoomName: string; username: string }) => {
      if (io.sockets.adapter.rooms.has(enteredRoomName)) {
        const clientsInRoom = io.sockets.adapter.rooms.get(enteredRoomName)?.size || 0;

        if (clientsInRoom <= MAX_USERS_PER_ROOM) {
          socket.join(enteredRoomName);
          socket.to(enteredRoomName).emit("user-joined", { id: socket.id, name: username, answers: [] });
          socket.emit("join-success");
        } else {
          socket.emit("join-failure", "La salle est remplie");
        }
      } else {
        socket.emit("join-failure", "Le nom de la salle n'existe pas");
      }
    });

    socket.on("next-question", ({ roomName, question }: { roomName: string; question: string }) => {
      socket.to(roomName).emit("next-question", question);
    });

    socket.on("launch-student-mode", ({ roomName, questions }: { roomName: string; questions: string[] }) => {
      socket.to(roomName).emit("launch-student-mode", questions);
    });

    socket.on("end-quiz", ({ roomName }: { roomName: string }) => {
      socket.to(roomName).emit("end-quiz");
    });

    socket.on("message", (data: string) => {
      console.log("Received message from", socket.id, ":", data);
    });

    socket.on("disconnect", () => {
      totalConnections--;
      console.log("A user disconnected:", socket.id, "| Total connections:", totalConnections);

      for (const [room] of io.sockets.adapter.rooms) {
        if (room !== socket.id) {
          io.to(room).emit("user-disconnected", socket.id);
        }
      }
    });

    socket.on("submit-answer", ({
      roomName,
      username,
      answer,
      idQuestion,
    }: {
      roomName: string;
      username: string;
      answer: string;
      idQuestion: string;
    }) => {
      socket.to(roomName).emit("submit-answer-room", {
        idUser: socket.id,
        username,
        answer,
        idQuestion,
      });
    });

    socket.on("error", (error) => {
      console.error("WebSocket server error:", error);
    });


    // Stress Testing

    socket.on("message-from-teacher", ({ roomName, message }: { roomName: string; message: string }) => {
      console.log(`Message reçu dans la salle ${roomName} : ${message}`);
      socket.to(roomName).emit("message-sent-teacher", { message });
    });

    socket.on("message-from-student", ({ roomName, message }: { roomName: string; message: string }) => {
      console.log(`Message reçu dans la salle ${roomName} : ${message}`);
      socket.to(roomName).emit("message-sent-student", { message });
    });

    socket.on("get-usage", () => {
      try {
        const memoryUsage = process.memoryUsage();
        const cpuUsage = process.cpuUsage();
        const totalMemory = os.totalmem();
        const freeMemory = os.freemem();
        const loadAverage = os.loadavg(); // Load average over 1, 5, and 15 minutes
    
        // Calculate CPU usage percentage
        const userCpuPercentage = ((cpuUsage.user / 1e6) / os.cpus().length).toFixed(2); // in %
        const systemCpuPercentage = ((cpuUsage.system / 1e6) / os.cpus().length).toFixed(2); // in %
    
        const usageData = {
          memory: {
            total: totalMemory,
            free: freeMemory,
            rss: memoryUsage.rss,
            heapTotal: memoryUsage.heapTotal,
            heapUsed: memoryUsage.heapUsed,
            external: memoryUsage.external,
            usagePercentage: (((totalMemory - freeMemory) / totalMemory) * 100).toFixed(2), // % used
          },
          cpu: {
            user: cpuUsage.user,
            system: cpuUsage.system,
            userPercentage: userCpuPercentage,
            systemPercentage: systemCpuPercentage,
          },
          system: {
            uptime: os.uptime(), // System uptime in seconds
            loadAverage: {
              "1min": loadAverage[0],
              "5min": loadAverage[1],
              "15min": loadAverage[2],
            },
          },
        };
    
        socket.emit("usage-data", usageData); // Send usage data back to the client
      } catch (error) {
        console.error("Error getting usage data:", error);
        socket.emit("error", { message: "Failed to retrieve usage data" });
      }
    });

  });

  const generateRoomName = (length = 6): string => {
    const characters = "0123456789";
    let result = "";
    for (let i = 0; i < length; i++) {
      result += characters.charAt(Math.floor(Math.random() * characters.length));
    }
    return result;
  };
};