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import {useContext, useEffect, useMemo, useRef, useState} from 'react';
import socketIOClient, {Socket} from 'socket.io-client';
import useStable from './useStable';
import {v4 as uuidv4} from 'uuid';
import {SocketContext} from './useSocket';
import {AppResetKeyContext} from './App';
import Backdrop from '@mui/material/Backdrop';
import CircularProgress from '@mui/material/CircularProgress';
import Typography from '@mui/material/Typography';
import {getURLParams} from './URLParams';
// The time to wait before showing a "disconnected" screen upon initial app load
const INITIAL_DISCONNECT_SCREEN_DELAY = 2000;
const SERVER_URL_DEFAULT = `${window.location.protocol === "https:" ? "wss" : "ws"
}://${window.location.host}`;
export default function SocketWrapper({children}) {
const [socket, setSocket] = useState<Socket | null>(null);
const [connected, setConnected] = useState<boolean | null>(null);
// Default to true:
const [willAttemptReconnect] = useState<boolean>(true);
const serverIDRef = useRef<string | null>(null);
const setAppResetKey = useContext(AppResetKeyContext);
/**
* Previously we had stored the clientID in local storage, but in that case
* if a user refreshes their page they'll still have the same clientID, and
* will be put back into the same room, which may be confusing if they're trying
* to join a new room or reset the app interface. So now clientIDs persist only as
* long as the react app full lifecycle
*/
const clientID = useStable<string>(() => {
const newID = uuidv4();
// Set the clientID in session storage so if the page reloads the person
// still retains their member/room config
return newID;
});
const socketObject = useMemo(
() => ({socket, clientID, connected: connected ?? false}),
[socket, clientID, connected],
);
useEffect(() => {
const queryParams = {
clientID: clientID,
};
const serverURLFromParams = getURLParams().serverURL;
const serverURL = serverURLFromParams ?? SERVER_URL_DEFAULT;
console.log(
`Opening socket connection to ${
serverURL?.length === 0 ? 'window.location.host' : serverURL
} with query params:`,
queryParams,
);
const newSocket: Socket = socketIOClient(serverURL, {
query: queryParams,
// Normally socket.io will fallback to http polling, but we basically never
// want that because that'd mean awful performance. It'd be better for the app
// to simply break in that case and not connect.
transports: ['websocket'],
path: '/ws/socket.io'
});
const onServerID = (serverID: string) => {
console.debug('Received server ID:', serverID);
if (serverIDRef.current != null) {
if (serverIDRef.current !== serverID) {
console.error(
'Server ID changed. Resetting the app using the app key',
);
setAppResetKey(serverID);
}
}
serverIDRef.current = serverID;
};
newSocket.on('server_id', onServerID);
setSocket(newSocket);
return () => {
newSocket.off('server_id', onServerID);
console.log(
'Closing socket connection in the useEffect cleanup function...',
);
newSocket.disconnect();
setSocket(null);
};
}, [clientID, setAppResetKey]);
useEffect(() => {
if (socket != null) {
const onAny = (eventName: string, ...args) => {
console.debug(`[event: ${eventName}] args:`, ...args);
};
socket.onAny(onAny);
return () => {
socket.offAny(onAny);
};
}
return () => {};
}, [socket]);
useEffect(() => {
if (socket != null) {
const onConnect = (...args) => {
console.debug('Connected to server with args:', ...args);
setConnected(true);
};
const onConnectError = (err) => {
console.error(`Connection error due to ${err.message}`);
};
const onDisconnect = (reason) => {
setConnected(false);
console.log(`Disconnected due to ${reason}`);
};
socket.on('connect', onConnect);
socket.on('connect_error', onConnectError);
socket.on('disconnect', onDisconnect);
return () => {
socket.off('connect', onConnect);
socket.off('connect_error', onConnectError);
socket.off('disconnect', onDisconnect);
};
}
}, [socket]);
useEffect(() => {
if (socket != null) {
const onReconnectError = (err) => {
console.log(`Reconnect error due to ${err.message}`);
};
socket.io.on('reconnect_error', onReconnectError);
const onError = (err) => {
console.log(`General socket error with message ${err.message}`);
};
socket.io.on('error', onError);
const onReconnect = (attempt) => {
console.log(`Reconnected after ${attempt} attempt(s)`);
};
socket.io.on('reconnect', onReconnect);
const disconnectOnBeforeUnload = () => {
console.log('Disconnecting due to beforeunload event...');
socket.disconnect();
setSocket(null);
};
window.addEventListener('beforeunload', disconnectOnBeforeUnload);
return () => {
socket.io.off('reconnect_error', onReconnectError);
socket.io.off('error', onError);
socket.io.off('reconnect', onReconnect);
window.removeEventListener('beforeunload', disconnectOnBeforeUnload);
};
}
}, [clientID, setAppResetKey, socket]);
/**
* Wait to show the disconnected screen on initial app load
*/
useEffect(() => {
window.setTimeout(() => {
setConnected((prev) => {
if (prev === null) {
return false;
}
return prev;
});
}, INITIAL_DISCONNECT_SCREEN_DELAY);
}, []);
return (
<SocketContext.Provider value={socketObject}>
{children}
<Backdrop
open={connected === false && willAttemptReconnect === true}
sx={{
color: '#fff',
zIndex: (theme) => theme.zIndex.drawer + 1,
}}>
<div
style={{
alignItems: 'center',
flexDirection: 'column',
textAlign: 'center',
}}>
<CircularProgress color="inherit" />
<Typography
align="center"
fontSize={{sm: 18, xs: 16}}
sx={{
fontFamily:
'ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace',
fontWeight: 'bold',
}}>
{'Disconnected. Attempting to reconnect...'}
</Typography>
</div>
</Backdrop>
</SocketContext.Provider>
);
}