cleanup (subfolder removed, npm packages removed, etc.); added y-websocket-server code

implemented frontend including separate message system; started to implement backend
2026-03-16 02:27:53 +01:00 · 2026-03-10 17:30:43 +01:00
7 changed files with 711 additions and 1 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1 @@
+node_modules/
--- a/README.md
+++ b/README.md
@@ -1 +1,28 @@
 # P2P Poll App
+
+## 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.
+
--- a/backend.js
+++ b/backend.js
@@ -0,0 +1,31 @@
+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');
+  });
+});*/
--- a/frontend.html
+++ b/frontend.html
@@ -0,0 +1,196 @@
+<!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>
--- a/package-lock.json
+++ b/package-lock.json
@@ -0,0 +1,144 @@
+{
+  "name": "yjs-poll",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "yjs-poll",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "@y/protocols": "^1.0.6-1",
+        "lib0": "^0.2.102",
+        "ws": "^8.19.0",
+        "yjs": "^14.0.0-7"
+      }
+    },
+    "node_modules/@y/protocols": {
+      "version": "1.0.6-rc.1",
+      "resolved": "https://registry.npmjs.org/@y/protocols/-/protocols-1.0.6-rc.1.tgz",
+      "integrity": "sha512-e/qs7hXcLk/SeNitxMXv2ymozyWFTULwbJEi7cAf/K/iXw9nGwGXHrR5TNluQ/bMwOX1cwuUT0hjEojkfH0gsA==",
+      "license": "MIT",
+      "dependencies": {
+        "lib0": "^1.0.0-rc.1"
+      },
+      "engines": {
+        "node": ">=16.0.0",
+        "npm": ">=8.0.0"
+      },
+      "funding": {
+        "type": "GitHub Sponsors ❤",
+        "url": "https://github.com/sponsors/dmonad"
+      },
+      "peerDependencies": {
+        "@y/y": "*"
+      }
+    },
+    "node_modules/@y/protocols/node_modules/lib0": {
+      "version": "1.0.0-rc.4",
+      "resolved": "https://registry.npmjs.org/lib0/-/lib0-1.0.0-rc.4.tgz",
+      "integrity": "sha512-mESL4089ji2HbS19DwAsYJRrtxZDjzMjEzjNR5kpzFBqlhvV0b7F9+SlA2SHOQU1Puu2A9xejKXtElK77swxLA==",
+      "license": "MIT",
+      "bin": {
+        "0ecdsa-generate-keypair": "src/bin/0ecdsa-generate-keypair.js",
+        "0gentesthtml": "src/bin/gentesthtml.js",
+        "0serve": "src/bin/0serve.js"
+      },
+      "engines": {
+        "node": ">=16"
+      },
+      "funding": {
+        "type": "GitHub Sponsors ❤",
+        "url": "https://github.com/sponsors/dmonad"
+      }
+    },
+    "node_modules/@y/y": {
+      "version": "14.0.0-16",
+      "resolved": "https://registry.npmjs.org/@y/y/-/y-14.0.0-16.tgz",
+      "integrity": "sha512-4zwbLnLannzUiEdJn9r3IS2FCVdHqADZHLqAivzAuKeoCGZ55JUFebp/YUtrYuTE2ZaBgctxpzulqAAHaahtIA==",
+      "license": "MIT",
+      "peer": true,
+      "dependencies": {
+        "lib0": "^0.2.115-6"
+      },
+      "engines": {
+        "node": ">=16.0.0",
+        "npm": ">=8.0.0"
+      },
+      "funding": {
+        "type": "GitHub Sponsors ❤",
+        "url": "https://github.com/sponsors/dmonad"
+      }
+    },
+    "node_modules/isomorphic.js": {
+      "version": "0.2.5",
+      "resolved": "https://registry.npmjs.org/isomorphic.js/-/isomorphic.js-0.2.5.tgz",
+      "integrity": "sha512-PIeMbHqMt4DnUP3MA/Flc0HElYjMXArsw1qwJZcm9sqR8mq3l8NYizFMty0pWwE/tzIGH3EKK5+jes5mAr85yw==",
+      "license": "MIT",
+      "funding": {
+        "type": "GitHub Sponsors ❤",
+        "url": "https://github.com/sponsors/dmonad"
+      }
+    },
+    "node_modules/lib0": {
+      "version": "0.2.117",
+      "resolved": "https://registry.npmjs.org/lib0/-/lib0-0.2.117.tgz",
+      "integrity": "sha512-DeXj9X5xDCjgKLU/7RR+/HQEVzuuEUiwldwOGsHK/sfAfELGWEyTcf0x+uOvCvK3O2zPmZePXWL85vtia6GyZw==",
+      "license": "MIT",
+      "dependencies": {
+        "isomorphic.js": "^0.2.4"
+      },
+      "bin": {
+        "0ecdsa-generate-keypair": "bin/0ecdsa-generate-keypair.js",
+        "0gentesthtml": "bin/gentesthtml.js",
+        "0serve": "bin/0serve.js"
+      },
+      "engines": {
+        "node": ">=16"
+      },
+      "funding": {
+        "type": "GitHub Sponsors ❤",
+        "url": "https://github.com/sponsors/dmonad"
+      }
+    },
+    "node_modules/ws": {
+      "version": "8.19.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.19.0.tgz",
+      "integrity": "sha512-blAT2mjOEIi0ZzruJfIhb3nps74PRWTCz1IjglWEEpQl5XS/UNama6u2/rjFkDDouqr4L67ry+1aGIALViWjDg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/yjs": {
+      "version": "14.0.0-16",
+      "resolved": "https://registry.npmjs.org/yjs/-/yjs-14.0.0-16.tgz",
+      "integrity": "sha512-n7jMrQz4pgU/NFnf4qY53K2adR/fu6ViQ79qVIw6Og+BtuDs1hx3DjOi3iREVnA6tsxQXXVG3gvG0I2kpmAwoQ==",
+      "license": "MIT",
+      "dependencies": {
+        "lib0": "^0.2.115-6"
+      },
+      "engines": {
+        "node": ">=16.0.0",
+        "npm": ">=8.0.0"
+      },
+      "funding": {
+        "type": "GitHub Sponsors ❤",
+        "url": "https://github.com/sponsors/dmonad"
+      }
+    }
+  }
+}
--- a/package.json
+++ b/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "yjs-poll",
+  "version": "1.0.0",
+  "main": "index.js",
+  "type": "module",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "y-websocket": "y-websocket"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "description": "",
+  "dependencies": {
+    "ws": "^8.19.0",
+    "@y/protocols": "^1.0.6-1",
+    "lib0": "^0.2.102",
+    "yjs": "^14.0.0-7"
+  }
+}
--- a/utils.js
+++ b/utils.js
@@ -0,0 +1,291 @@
+/* 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))
+    }
+  }
+}
Author	SHA1	Message	Date
User	c89c6f95a6	cleanup (subfolder removed, npm packages removed, etc.); added y-websocket-server code	2026-03-16 02:27:53 +01:00
User	78d5352a48	implemented frontend including separate message system; started to implement backend	2026-03-10 17:30:43 +01:00