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const socket = require("socket.io");
const { SOCKET_EVENTS } = require("./constants");
const { Chess } = require("chess.js");
const { User } = require("./models/user");
const { Game } = require("./models/game");
const { nextMove } = require("./chessbot");
const {
CHESS_MOVE,
CHESS_OPPONENT_MOVE,
JOIN_ROOM,
JOIN_ROOM_ERROR,
JOIN_ROOM_SUCCESS,
ROOM_FULL,
USER_JOINED_ROOM,
USER_RESIGNED,
GAME_END,
} = SOCKET_EVENTS;
// roomID => { timeLimit,gameHistory , players:{'b': {username,userid}, 'w':{username,userid} } }
let activeRooms = new Map();
// chess - chess object
// moveData - {from,to} => lan notation
function isValidMove(chess,moveData) {
let newChess = new Chess();
newChess.loadPgn(chess.pgn());
try {
newChess.move(moveData);
return true;
} catch(err) {
return false;
}
}
function createRoom(roomID, timeLimit) {
console.log(roomID, "created");
activeRooms.set(roomID, { timeLimit, players: {}, gameHistory: [] });
console.log("Currently active rooms", activeRooms.size);
}
function getRoom(roomID) {
return activeRooms.get(roomID);
}
function destoryRoom(roomID) {
activeRooms.delete(roomID);
}
// structure of userDetails: {username,userid,color}
function addUserToRoom(roomID, socket, userDetails) {
console.log(userDetails);
let { username, color, userid } = userDetails;
let room = activeRooms.get(roomID);
if (room.players[color]) {
room.players[color] = { username, userid, socket };
return JOIN_ROOM_SUCCESS;
}
if (Object.keys(room.players).length > 1) {
// room is full
console.log(activeRooms);
return ROOM_FULL;
} else {
room.players[color] = { username, userid, socket };
}
console.log(activeRooms);
return JOIN_ROOM_SUCCESS;
}
// initialize the socket server with the given http server instance
function socketIOServerInit(server) {
const io = new socket.Server(server, {
cors: {
origin: process.env.CORS_ALLOWED_HOST,
},
});
const ioBot = io.of("/chessbot");
ioBot.on("connection", (socket) => {
let id = socket.id;
console.log(id, "connected on /chessbot");
const chess = new Chess();
socket.onAny((evt) => {
console.log(evt);
});
socket.on('INIT', async (data) => {
if(data.color === 'b') {
console.log(data.color);
const botMove = await nextMove({position:chess.fen()});
console.log({ from: botMove.substring(0, 2), to: botMove.substring(2) });
chess.move({from:botMove.substring(0,2),to:botMove.substring(2)});
setTimeout(() => {
socket.emit("CHESS_BOT_MOVE",{from:botMove.substring(0,2),to:botMove.substring(2)})
}, 500);
}
});
socket.on("disconnect", (reason) => {
console.log(id, "disconnected due to", reason);
});
socket.on(CHESS_MOVE, async (roomID, moveData) => {
console.log("CHESS_MOVE");
if(!isValidMove(chess,moveData)) return;
chess.move(moveData);
let move = moveData.from + moveData.to;
console.log(move);
const botMove = await nextMove({ position: chess.fen() });
console.log({ from: botMove.substring(0, 2), to: botMove.substring(2) });
chess.move({ from: botMove.substring(0, 2), to: botMove.substring(2) });
socket.emit("CHESS_BOT_MOVE", { from: botMove.substring(0, 2), to: botMove.substring(2) });
});
});
io.on("connection", (socket) => {
let id = socket.id;
console.log(socket.id, "connected");
socket.on("disconnect", (reason) => {
console.log(id, "disconnected due to", reason);
});
// data is the metadata of the user joining the room played between the users
// structure: {username,color}
socket.on(JOIN_ROOM, (roomID, data) => {
if (activeRooms.has(roomID)) {
let result = addUserToRoom(roomID, socket, data);
if (result === JOIN_ROOM_SUCCESS) {
socket.join(roomID);
// io.to(roomID).emit("new user joined the room");
console.log(data, "joined");
let room = getRoom(roomID);
socket.to(roomID).emit(USER_JOINED_ROOM, data.username);
socket.emit(result, room.gameHistory); // room joined successfully
} else {
socket.emit(result); // room is full
}
} else {
socket.emit(JOIN_ROOM_ERROR, "room does not exist");
}
});
socket.on(CHESS_MOVE, (roomID, moveData) => {
console.log(moveData);
let room = activeRooms.get(roomID);
room.gameHistory.push(moveData);
socket.to(roomID).emit(CHESS_OPPONENT_MOVE, moveData);
});
socket.on(USER_RESIGNED, async (roomID, username) => {
socket.to(roomID).emit(USER_RESIGNED, username);
});
socket.on(GAME_END, async (roomID) => {
console.log("Ending game...");
const room = getRoom(roomID);
const black = room.players["b"];
const white = room.players["w"];
io.socketsLeave(roomID);
black.socket.disconnect();
white.socket.disconnect();
// generating pgn
let moves = room.gameHistory;
let chess = new Chess();
for (let move of moves) {
let { from, to } = move;
chess.move({ from, to });
}
let pgn = chess.pgn();
const blackPlayerDoc = await User.findById(black.userid);
const whitePlayerDoc = await User.findById(white.userid);
let gameData = {
white: whitePlayerDoc.id,
black: blackPlayerDoc.id,
timeLimit: room.timeLimit,
roomID,
pgn,
};
const gameDoc = await Game.create(gameData);
blackPlayerDoc.games.push(gameDoc.id);
await blackPlayerDoc.save();
whitePlayerDoc.games.push(gameDoc.id);
await whitePlayerDoc.save();
});
});
}
module.exports = {
activeRooms,
createRoom,
addUserToRoom,
socketIOServerInit,
};
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