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28 changed files with 649 additions and 7075 deletions

42
.gitignore vendored
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# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
# dependencies
/node_modules
/.pnp
.pnp.*
.yarn/*
!.yarn/patches
!.yarn/plugins
!.yarn/releases
!.yarn/versions
# testing
/coverage
# next.js
/.next/
/out/
# production
/build
# misc
.DS_Store
*.pem
# debug
npm-debug.log*
yarn-debug.log*
yarn-error.log*
.pnpm-debug.log*
# env files (can opt-in for committing if needed)
.env*
# vercel
.vercel
# typescript
*.tsbuildinfo
next-env.d.ts
node_modules/

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# P2P Poll App
Remove-Item -Recurse -Force node_modules, .next
## Install npm packages
```
npm init -y
npm install
```
Note: the frontend obtains the packages `yjs` and `y-websocket` dynamically.
## Run backend
```
node backend.js
```
### Note on Yjs suggestion
Note that the following server setup is suggested in the Yjs docs (https://docs.yjs.dev/ecosystem/connection-provider/y-websocket):
```
npm install y-websocket-server
HOST=localhost PORT=1000 npx y-websocket
```
However, across a range of npm versions, this does not work.
Nevertheless, the essential code from the `y-websocket-server` package is used here as provided in `utils.js`.
## Run frontend
Open "frontend.html" in browser.

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@import "tailwindcss";
:root {
--background: #ffffff;
--foreground: #171717;
}
@theme inline {
--color-background: var(--background);
--color-foreground: var(--foreground);
--font-sans: var(--font-geist-sans);
--font-mono: var(--font-geist-mono);
}
@media (prefers-color-scheme: dark) {
:root {
--background: #0a0a0a;
--foreground: #ededed;
}
}
body {
background: var(--background);
color: var(--foreground);
font-family: Arial, Helvetica, sans-serif;
}

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import type { Metadata } from "next";
import "./globals.css";
export const metadata: Metadata = {
title: "p2p polling",
description: "creating a p2p-polling app",
};
export default function RootLayout({
children,
}: Readonly<{
children: React.ReactNode;
}>) {
return (
<html
lang="en"
className={` h-full antialiased`}
>
<body className="min-h-full flex flex-col">{children}</body>
</html>
);
}

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"use client";
import { useState } from "react";
import usePeerManager from "../hooks/usePeerManager";
import usePollManager from "../hooks/usePollManager";
import PollCreation from "../components/PollCreation";
import PollActive from "../components/PollActive";
import PeersList from "../components/PeersList";
export default function Page() {
const peerManager = usePeerManager();
const pollManager = usePollManager(peerManager);
const [connectId, setConnectId] = useState("");
return (
<div className="p-6 space-y-4">
<h1 className="text-2xl font-bold">P2P Poll App</h1>
{/* Connect */}
<div className="flex gap-2">
<input
className="border p-2"
placeholder="Peer ID"
value={connectId}
onChange={(e) => setConnectId(e.target.value)}
/>
<button
className="bg-blue-500 text-white px-4"
onClick={() => peerManager.connectToPeer(connectId)}
>
Connect
</button>
</div>
<p>Your ID: {peerManager.peerId}</p>
{pollManager.poll ? (
<PollActive pollManager={pollManager} peerId={peerManager.peerId} />
) : (
<PollCreation pollManager={pollManager} />
)}
<PeersList peers={peerManager.peers} />
</div>
);
}

31
backend.js Normal file
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import { WebSocketServer } from 'ws';
import { setupWSConnection } from './utils.js'
// Create a WebSocket server
const WS_PORT = 8080;
const wss = new WebSocketServer({ port: WS_PORT });
console.log('WebSocket server is running on ws://localhost:' + String(WS_PORT));
// Connection event handler
wss.on('connection', setupWSConnection);
/*
wss.on('connection', (ws) => {
console.log('Client connected');
// Message event handler
ws.on('message', (message) => {
let msg_str = String(message);
console.log("Received: " + msg_str);
// If this is a text or state message (no Yjs logic) - echo the message back to the client
if (msg_str.startsWith("TEXT_MESSAGE") | msg_str.startsWith("STATE_MESSAGE")) {
ws.send(msg_str);
}
});
// Close event handler
ws.on('close', () => {
console.log('Client disconnected');
});
});*/

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"use client";
type NotificationType = "info" | "success" | "error";
interface NotificationProps {
message: string;
type?: NotificationType;
}
export default function Notification({ message, type = "info" }: NotificationProps) {
const colors: Record<NotificationType, string> = {
info: "bg-blue-100 text-blue-700",
success: "bg-green-100 text-green-700",
error: "bg-red-100 text-red-700",
};
return (
<div className={`px-4 py-2 rounded shadow ${colors[type]}`}>
{message}
</div>
);
}

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"use client";
export default function PeersList({ peers }: { peers: string[] }) {
return (
<div>
<h3>Peers</h3>
{peers.length === 0 ? (
<p>No peers</p>
) : (
peers.map((p) => <div key={p}>{p}</div>)
)}
</div>
);
}

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"use client";
import PollOption from "./PollOption";
export default function PollActive({ pollManager, peerId }: any) {
const poll = pollManager.poll;
return (
<div>
<h2 className="text-xl font-bold">{poll.question}</h2>
{poll.options.map((opt: any) => (
<PollOption
key={opt.id}
option={opt}
pollManager={pollManager}
peerId={peerId}
/>
))}
</div>
);
}

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"use client";
import { useState } from "react";
export default function PollCreation({ pollManager }: any) {
const [question, setQuestion] = useState("");
const [options, setOptions] = useState<string[]>(["", ""]);
return (
<div>
<input
className="border p-2 w-full"
placeholder="Question"
value={question}
onChange={(e) => setQuestion(e.target.value)}
/>
{options.map((opt, i) => (
<input
key={i}
className="border p-2 w-full mt-2"
placeholder={`Option ${i + 1}`}
value={opt}
onChange={(e) => {
const newOpts = [...options];
newOpts[i] = e.target.value;
setOptions(newOpts);
}}
/>
))}
<button
className="bg-green-500 text-white px-4 mt-2"
onClick={() => pollManager.createPoll(question, options)}
>
Create Poll
</button>
</div>
);
}

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"use client";
export default function PollOption({ option, pollManager, peerId }: any) {
return (
<div
className="border p-2 mt-2 cursor-pointer"
onClick={() => pollManager.vote(option.id, peerId)}
>
{option.text} - {option.votes} votes
</div>
);
}

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import { defineConfig, globalIgnores } from "eslint/config";
import nextVitals from "eslint-config-next/core-web-vitals";
import nextTs from "eslint-config-next/typescript";
const eslintConfig = defineConfig([
...nextVitals,
...nextTs,
// Override default ignores of eslint-config-next.
globalIgnores([
// Default ignores of eslint-config-next:
".next/**",
"out/**",
"build/**",
"next-env.d.ts",
]),
]);
export default eslintConfig;

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frontend.html Normal file
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<!DOCTYPE html>
<html>
<head>
<title>Poll Client</title>
<style>
body {
font-family: Arial, sans-serif;
max-width: 600px;
margin: 0 auto;
padding: 20px;
}
#messages {
height: 300px;
border: 1px solid #ccc;
overflow-y: auto;
padding: 10px;
margin-bottom: 10px;
}
.message { margin: 5px 0; }
</style>
</head>
<body>
<h1>Poll Client</h1>
<div id="status">Connecting to server...</div>
<div id="status2">Connecting to server...</div>
<div id="messages"></div>
<div>
<input type="text" id="messageInput" placeholder="Type your message">
<!--button onclick="sendMessage()">Send</button-->
<button id="sendBtn">Send</button>
<input id="optionInput" placeholder="Add option">
<button id="addBtn">Add</button>
<ul id="options"></ul>
</div>
<script type="module">
import * as Y from "https://esm.sh/yjs"
import { WebsocketProvider } from "https://esm.sh/y-websocket"
const WS_PORT = 8080;
const ydoc = new Y.Doc();
const status = document.getElementById('status');
const status2 = document.getElementById('status2');
const messages = document.getElementById('messages');
const messageInput = document.getElementById('messageInput');
// Connect to the backend (WebSocket server) via Yjs WebsocketProvider
const wsp = new WebsocketProvider(
'ws://localhost:' + String(WS_PORT), 'poll-room',
ydoc
)
wsp.on('status', event => {
//console.log("event.status =", event.status)
if (event.status == "connected") {
status.textContent = 'Yjs connected to WebSocket server';
status.style.color = 'green';
}
else {
status.textContent = 'Yjs disonnected from WebSocket server';
status.style.color = 'red';
}
})
wsp.onopen = () => {
console.log('connected to y-websocket server');
};
ydoc.on('update', () => {
console.log('Yjs document updated locally');
});
wsp.on('sync', isSynced => {
console.log("isSynced =", isSynced)
})
// Connect to the backend (WebSocket server) via common WebSocket (only for informative messages)
const ws = new WebSocket('ws://localhost:' + String(WS_PORT));
ws.onopen = () => {
status2.textContent = 'WebSocket client connected to WebSocket server';
status2.style.color = 'green';
};
ws.onmessage = (event) => {
const message = document.createElement('div');
message.className = 'message';
message.textContent = event.data;
messages.appendChild(message);
messages.scrollTop = messages.scrollHeight;
};
ws.onerror = (error) => {
status2.textContent = 'Error: ' + error.message;
status2.style.color = 'red';
};
ws.onclose = () => {
status2.textContent = 'WebSocket client disconnected from WebSocket server';
status2.style.color = 'red';
};
// Function to send a message
function sendMessage(command, payload) {
let message = "";
if (command === "TEXT_MESSAGE") {
message = command + ":" + messageInput.value.trim();
messageInput.value = "";
}
else if (command.startsWith("STATE_MESSAGE--")) {
message = command + ":" + payload;
}
else {
console.log("Error: unknown command '" + command + "'")
}
if (message) {
/* To make compatible with y-websocket-server API:
const encoder = encoding.createEncoder()
encoding.writeVarUint(encoder, messageTextMessage)
syncProtocol.writeUpdate(encoder, update)
enc_message = encoding.toUint8Array(encoder)*/
ws.send(message);
}
}
// Send message on button click
document.getElementById("sendBtn").onclick = () => {
sendMessage("TEXT_MESSAGE", "");
};
// Send message on Enter key
messageInput.addEventListener('keypress', (e) => {
if (e.key === 'Enter') {
sendMessage("TEXT_MESSAGE", "");
}
});
// Actual poll logic
const optionsMap = ydoc.getMap("options");
const optionsList = document.getElementById("options");
const input = document.getElementById("optionInput");
function render() {
optionsList.innerHTML = ""
optionsMap.forEach((vote, name) => {
// List element for this option
const li = document.createElement("li")
// Label for this option
const label = document.createElement("span")
label.textContent = name + " — " + vote + " "
// "Vote"/"Unvote" button
const voteBtn = document.createElement("button")
if (vote == false) {
voteBtn.textContent = "Vote"
}
else {
voteBtn.textContent = "Unvote"
}
voteBtn.onclick = () => {
vote = !vote;
optionsMap.set(name, vote);
sendMessage("STATE_MESSAGE--" + (vote ? "VOTE" : "UNVOTE"), name);
}
// "Remove" button
const removeBtn = document.createElement("button")
removeBtn.textContent = "Remove"
removeBtn.onclick = () => {
optionsMap.delete(name);
sendMessage("STATE_MESSAGE--REMOVE", name);
}
li.appendChild(label)
li.appendChild(voteBtn)
li.appendChild(removeBtn)
optionsList.appendChild(li)
})
};
document.getElementById("addBtn").onclick = () => {
const name = input.value.trim()
if (!name) return
if (!optionsMap.has(name)) {
optionsMap.set(name, false);
sendMessage("STATE_MESSAGE--ADD_OPTION", name);
}
input.value = ""
};
optionsMap.observe(render);
render();
</script>
</body>
</html>

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"use client";
import { useEffect, useRef, useState } from "react";
import Peer from "peerjs";
export default function usePeerManager() {
const [peerId, setPeerId] = useState<string | null>(null);
const [peers, setPeers] = useState<string[]>([]);
const peerRef = useRef<Peer | null>(null);
const connectionsRef = useRef<Map<string, any>>(new Map());
useEffect(() => {
const peer = new Peer();
peerRef.current = peer;
peer.on("open", (id) => {
setPeerId(id);
});
peer.on("connection", (conn) => {
conn.on("open", () => {
connectionsRef.current.set(conn.peer, conn);
setPeers(Array.from(connectionsRef.current.keys()));
});
conn.on("data", (data) => {
console.log("Received:", data);
});
conn.on("close", () => {
connectionsRef.current.delete(conn.peer);
setPeers(Array.from(connectionsRef.current.keys()));
});
});
return () => {
peer.destroy();
};
}, []);
const connectToPeer = (id: string) => {
if (!peerRef.current) return;
const conn = peerRef.current.connect(id);
conn.on("open", () => {
connectionsRef.current.set(conn.peer, conn);
setPeers(Array.from(connectionsRef.current.keys()));
});
};
const broadcast = (data: any) => {
connectionsRef.current.forEach((conn) => {
if (conn.open) conn.send(data);
});
};
return { peerId, peers, connectToPeer, broadcast };
}

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"use client";
import { useState } from "react";
type Option = {
id: string;
text: string;
votes: number;
voters: string[];
};
type Poll = {
id: string;
question: string;
options: Option[];
};
export default function usePollManager(peerManager: any) {
const [poll, setPoll] = useState<Poll | null>(null);
const [myVote, setMyVote] = useState<string | null>(null);
const createPoll = (question: string, options: string[]) => {
const newPoll: Poll = {
id: Date.now().toString(),
question,
options: options.map((opt, i) => ({
id: `opt-${i}`,
text: opt,
votes: 0,
voters: [],
})),
};
setPoll(newPoll);
peerManager.broadcast({ type: "poll", poll: newPoll });
};
const vote = (optionId: string, peerId: string) => {
if (!poll) return;
const updated = { ...poll };
updated.options.forEach((opt) => {
const index = opt.voters.indexOf(peerId);
if (index !== -1) {
opt.voters.splice(index, 1);
opt.votes--;
}
});
const option = updated.options.find((o) => o.id === optionId);
if (!option) return;
option.votes++;
option.voters.push(peerId);
setPoll(updated);
setMyVote(optionId);
peerManager.broadcast({
type: "vote",
optionId,
voterId: peerId,
});
};
return { poll, createPoll, vote, myVote };
}

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import type { NextConfig } from "next";
const nextConfig: NextConfig = {
experimental: {
turbopackFileSystemCacheForDev: true,
}
};
export default nextConfig;

6692
package-lock.json generated

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{
"name": "p2p-polling",
"version": "0.1.0",
"private": true,
"name": "yjs-poll",
"version": "1.0.0",
"main": "index.js",
"type": "module",
"scripts": {
"dev": "next dev",
"build": "next build",
"start": "next start",
"lint": "eslint"
"test": "echo \"Error: no test specified\" && exit 1",
"y-websocket": "y-websocket"
},
"keywords": [],
"author": "",
"license": "ISC",
"description": "",
"dependencies": {
"next": "16.2.0",
"peerjs": "^1.5.5",
"react": "19.2.4",
"react-dom": "19.2.4"
},
"devDependencies": {
"@tailwindcss/postcss": "^4",
"@types/node": "^20",
"@types/react": "^19",
"@types/react-dom": "^19",
"eslint": "^9",
"eslint-config-next": "16.2.0",
"tailwindcss": "^4",
"typescript": "^5"
"ws": "^8.19.0",
"@y/protocols": "^1.0.6-1",
"lib0": "^0.2.102",
"yjs": "^14.0.0-7"
}
}

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const config = {
plugins: {
"@tailwindcss/postcss": {},
},
};
export default config;

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{
"compilerOptions": {
"target": "ES2017",
"lib": ["dom", "dom.iterable", "esnext"],
"allowJs": true,
"skipLibCheck": true,
"strict": true,
"noEmit": true,
"esModuleInterop": true,
"module": "esnext",
"moduleResolution": "bundler",
"resolveJsonModule": true,
"isolatedModules": true,
"jsx": "react-jsx",
"incremental": true,
"plugins": [
{
"name": "next"
}
],
"paths": {
"@/*": ["./*"]
}
},
"include": [
"next-env.d.ts",
"**/*.ts",
"**/*.tsx",
".next/types/**/*.ts",
".next/dev/types/**/*.ts",
"**/*.mts"
],
"exclude": ["node_modules"]
}

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/* Adapted from https://github.com/yjs/y-websocket-server/blob/main/src/server.js, version of 2025-04-02
(author: dmonad/Kevin Jahns, MIT license) */
import * as Y from 'yjs'
import * as syncProtocol from '@y/protocols/sync'
import * as awarenessProtocol from '@y/protocols/awareness'
import * as encoding from 'lib0/encoding'
import * as decoding from 'lib0/decoding'
import * as map from 'lib0/map'
import * as eventloop from 'lib0/eventloop'
/*import { callbackHandler, isCallbackSet } from './callback.js'
const CALLBACK_DEBOUNCE_WAIT = parseInt(process.env.CALLBACK_DEBOUNCE_WAIT || '2000')
const CALLBACK_DEBOUNCE_MAXWAIT = parseInt(process.env.CALLBACK_DEBOUNCE_MAXWAIT || '10000')
const debouncer = eventloop.createDebouncer(CALLBACK_DEBOUNCE_WAIT, CALLBACK_DEBOUNCE_MAXWAIT)*/
const wsReadyStateConnecting = 0
const wsReadyStateOpen = 1
const wsReadyStateClosing = 2 // eslint-disable-line
const wsReadyStateClosed = 3 // eslint-disable-line
// disable gc when using snapshots!
const gcEnabled = process.env.GC !== 'false' && process.env.GC !== '0'
// const persistenceDir = process.env.YPERSISTENCE
/**
* @type {{bindState: function(string,WSSharedDoc):void, writeState:function(string,WSSharedDoc):Promise<any>, provider: any}|null}
*/
let persistence = null
/**
* @param {{bindState: function(string,WSSharedDoc):void,
* writeState:function(string,WSSharedDoc):Promise<any>,provider:any}|null} persistence_
*/
export const setPersistence = persistence_ => {
persistence = persistence_
}
/**
* @return {null|{bindState: function(string,WSSharedDoc):void,
* writeState:function(string,WSSharedDoc):Promise<any>}|null} used persistence layer
*/
export const getPersistence = () => persistence
/**
* @type {Map<string,WSSharedDoc>}
*/
export const docs = new Map()
const messageSync = 0
const messageAwareness = 1
// const messageAuth = 2
//const messageTextMessage = 3
//const messageStateMessage = 4
/**
* @param {Uint8Array} update
* @param {any} _origin
* @param {WSSharedDoc} doc
* @param {any} _tr
*/
const updateHandler = (update, _origin, doc, _tr) => {
const encoder = encoding.createEncoder()
encoding.writeVarUint(encoder, messageSync)
syncProtocol.writeUpdate(encoder, update)
const message = encoding.toUint8Array(encoder)
doc.conns.forEach((_, conn) => send(doc, conn, message))
}
/**
* @type {(ydoc: Y.Doc) => Promise<void>}
*/
let contentInitializor = _ydoc => Promise.resolve()
/**
* This function is called once every time a Yjs document is created. You can
* use it to pull data from an external source or initialize content.
*
* @param {(ydoc: Y.Doc) => Promise<void>} f
*/
export const setContentInitializor = (f) => {
contentInitializor = f
}
export class WSSharedDoc extends Y.Doc {
/**
* @param {string} name
*/
constructor (name) {
super({ gc: gcEnabled })
this.name = name
/**
* Maps from conn to set of controlled user ids. Delete all user ids from awareness when this conn is closed
* @type {Map<Object, Set<number>>}
*/
this.conns = new Map()
/**
* @type {awarenessProtocol.Awareness}
*/
this.awareness = new awarenessProtocol.Awareness(this)
this.awareness.setLocalState(null)
/**
* @param {{ added: Array<number>, updated: Array<number>, removed: Array<number> }} changes
* @param {Object | null} conn Origin is the connection that made the change
*/
const awarenessChangeHandler = ({ added, updated, removed }, conn) => {
const changedClients = added.concat(updated, removed)
if (conn !== null) {
const connControlledIDs = /** @type {Set<number>} */ (this.conns.get(conn))
if (connControlledIDs !== undefined) {
added.forEach(clientID => { connControlledIDs.add(clientID) })
removed.forEach(clientID => { connControlledIDs.delete(clientID) })
}
}
// broadcast awareness update
const encoder = encoding.createEncoder()
encoding.writeVarUint(encoder, messageAwareness)
encoding.writeVarUint8Array(encoder, awarenessProtocol.encodeAwarenessUpdate(this.awareness, changedClients))
const buff = encoding.toUint8Array(encoder)
this.conns.forEach((_, c) => {
send(this, c, buff)
})
}
this.awareness.on('update', awarenessChangeHandler)
this.on('update', /** @type {any} */ (updateHandler))
//if (isCallbackSet) {
// this.on('update', (_update, _origin, doc) => {
// debouncer(() => callbackHandler(/** @type {WSSharedDoc} */ (doc)))
// })
//}
this.whenInitialized = contentInitializor(this)
}
}
/**
* Gets a Y.Doc by name, whether in memory or on disk
*
* @param {string} docname - the name of the Y.Doc to find or create
* @param {boolean} gc - whether to allow gc on the doc (applies only when created)
* @return {WSSharedDoc}
*/
export const getYDoc = (docname, gc = true) => map.setIfUndefined(docs, docname, () => {
const doc = new WSSharedDoc(docname)
doc.gc = gc
if (persistence !== null) {
persistence.bindState(docname, doc)
}
docs.set(docname, doc)
return doc
})
/**
* @param {any} conn
* @param {WSSharedDoc} doc
* @param {Uint8Array} message
*/
const messageListener = (conn, doc, message) => {
try {
const encoder = encoding.createEncoder()
const decoder = decoding.createDecoder(new Uint8Array(message))
const messageType = decoding.readVarUint(decoder)
switch (messageType) {
case messageSync:
encoding.writeVarUint(encoder, messageSync)
syncProtocol.readSyncMessage(decoder, encoder, doc, conn)
// If the `encoder` only contains the type of reply message and no
// message, there is no need to send the message. When `encoder` only
// contains the type of reply, its length is 1.
if (encoding.length(encoder) > 1) {
send(doc, conn, encoding.toUint8Array(encoder))
}
break
case messageAwareness: {
awarenessProtocol.applyAwarenessUpdate(doc.awareness, decoding.readVarUint8Array(decoder), conn)
break
}
// If this is a text or a message (no Yjs logic) - echo the message back to the client
default: {
conn.send(String(message))
console.log(String(message))
break
}
}
} catch (err) {
console.error(err)
// @ts-ignore
doc.emit('error', [err])
}
}
/**
* @param {WSSharedDoc} doc
* @param {any} conn
*/
const closeConn = (doc, conn) => {
if (doc.conns.has(conn)) {
/**
* @type {Set<number>}
*/
// @ts-ignore
const controlledIds = doc.conns.get(conn)
doc.conns.delete(conn)
awarenessProtocol.removeAwarenessStates(doc.awareness, Array.from(controlledIds), null)
if (doc.conns.size === 0 && persistence !== null) {
// if persisted, we store state and destroy ydocument
persistence.writeState(doc.name, doc).then(() => {
doc.destroy()
})
docs.delete(doc.name)
}
}
conn.close()
}
/**
* @param {WSSharedDoc} doc
* @param {import('ws').WebSocket} conn
* @param {Uint8Array} m
*/
const send = (doc, conn, m) => {
if (conn.readyState !== wsReadyStateConnecting && conn.readyState !== wsReadyStateOpen) {
closeConn(doc, conn)
}
try {
conn.send(m, {}, err => { err != null && closeConn(doc, conn) })
} catch (e) {
closeConn(doc, conn)
}
}
const pingTimeout = 30000
/**
* @param {import('ws').WebSocket} conn
* @param {import('http').IncomingMessage} req
* @param {any} opts
*/
export const setupWSConnection = (conn, req, { docName = (req.url || '').slice(1).split('?')[0], gc = true } = {}) => {
conn.binaryType = 'arraybuffer'
// get doc, initialize if it does not exist yet
const doc = getYDoc(docName, gc)
doc.conns.set(conn, new Set())
// listen and reply to events
conn.on('message', /** @param {ArrayBuffer} message */ message => messageListener(conn, doc, message))
// Check if connection is still alive
let pongReceived = true
const pingInterval = setInterval(() => {
if (!pongReceived) {
if (doc.conns.has(conn)) {
closeConn(doc, conn)
}
clearInterval(pingInterval)
} else if (doc.conns.has(conn)) {
pongReceived = false
try {
conn.ping()
} catch (e) {
closeConn(doc, conn)
clearInterval(pingInterval)
}
}
}, pingTimeout)
conn.on('close', () => {
closeConn(doc, conn)
clearInterval(pingInterval)
})
conn.on('pong', () => {
pongReceived = true
})
// put the following in a variables in a block so the interval handlers don't keep in in
// scope
{
// send sync step 1
const encoder = encoding.createEncoder()
encoding.writeVarUint(encoder, messageSync)
syncProtocol.writeSyncStep1(encoder, doc)
send(doc, conn, encoding.toUint8Array(encoder))
const awarenessStates = doc.awareness.getStates()
if (awarenessStates.size > 0) {
const encoder = encoding.createEncoder()
encoding.writeVarUint(encoder, messageAwareness)
encoding.writeVarUint8Array(encoder, awarenessProtocol.encodeAwarenessUpdate(doc.awareness, Array.from(awarenessStates.keys())))
send(doc, conn, encoding.toUint8Array(encoder))
}
}
}