implemented websocket provider

.gitignore

@@ -5,3 +5,4 @@ docs
 /examples/yjs-dist.js*
 .vscode
 .yjsPersisted
+build

examples/textarea/index.js

@@ -1,25 +1,13 @@
-import { createYdbClient } from '../../YdbClient/index.js'
-import Y from '../../src/Y.dist.js'
+/* eslint-env browser */
+import * as Y from '../../src/index.js'
+import WebsocketProvider from '../../provider/websocket/WebSocketProvider.js'
 
-createYdbClient('ws://localhost:8899/ws').then(ydbclient => {
-  const y = ydbclient.getY('textarea')
-  let type = y.define('textarea', Y.Text)
-  let textarea = document.querySelector('textarea')
-  window.binding = new Y.TextareaBinding(type, textarea)
-})
+const provider = new WebsocketProvider('ws://localhost:1234/')
+const ydocument = provider.get('textarea')
+const type = ydocument.define('textarea', Y.Text)
+const textarea = document.querySelector('textarea')
+const binding = new Y.TextareaBinding(type, textarea)
 
-/*
-let y = new Y('textarea-example', {
-  connector: {
-    name: 'websockets-client',
-    url: 'http://127.0.0.1:1234'
-  }
-})
-
-window.yTextarea = y
-
-// bind the textarea to a shared text element
-let type = y.define('textarea', Y.Text)
-let textarea = document.querySelector('textarea')
-window.binding = new Y.TextareaBinding(type, textarea)
-*/
+window.textareaExample = {
+  provider, ydocument, type, textarea, binding
+}

package-lock.json

@@ -271,6 +271,11 @@
       "integrity": "sha1-GdOGodntxufByF04iu28xW0zYC0=",
       "dev": true
     },
+    "async-limiter": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.0.tgz",
+      "integrity": "sha512-jp/uFnooOiO+L211eZOoSyzpOITMXx1rBITauYykG3BRYPu8h0UcxsPNB04RR5vo4Tyz3+ay17tR6JVf9qzYWg=="
+    },
     "asynckit": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
@@ -2597,7 +2602,7 @@
       "dependencies": {
         "babel-generator": {
           "version": "6.11.4",
-          "resolved": "http://registry.npmjs.org/babel-generator/-/babel-generator-6.11.4.tgz",
+          "resolved": "https://registry.npmjs.org/babel-generator/-/babel-generator-6.11.4.tgz",
           "integrity": "sha1-FPaTOrsgxiZm0n47e59bncBxKpo=",
           "dev": true,
           "requires": {
@@ -2628,7 +2633,7 @@
         },
         "minimist": {
           "version": "1.2.0",
-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
         },
@@ -7019,6 +7024,14 @@
         "mkdirp": "^0.5.1"
       }
     },
+    "ws": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-6.1.0.tgz",
+      "integrity": "sha512-H3dGVdGvW2H8bnYpIDc3u3LH8Wue3Qh+Zto6aXXFzvESkTVT6rAfKR6tR/+coaUvxs8yHtmNV0uioBF62ZGSTg==",
+      "requires": {
+        "async-limiter": "~1.0.0"
+      }
+    },
     "xml-name-validator": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-2.0.1.tgz",

package.json

@@ -69,5 +69,8 @@
     "rollup-regenerator-runtime": "^6.23.1",
     "rollup-watch": "^3.2.2",
     "standard": "^11.0.1"
+  },
+  "dependencies": {
+    "ws": "^6.1.0"
   }
 }

provider/websocket/WebSocketProvider.js

@@ -0,0 +1,85 @@
+/* eslint-env browser */
+
+import * as Y from '../../src/index.js'
+export * from '../../src/index.js'
+
+const reconnectTimeout = 100
+
+const setupWS = (doc, url) => {
+  const websocket = new WebSocket(url)
+  websocket.binaryType = 'arraybuffer'
+  doc.ws = websocket
+  websocket.onmessage = event => {
+    const decoder = Y.createDecoder(event.data)
+    const encoder = Y.createEncoder()
+    doc.mux(() =>
+      Y.readMessage(decoder, encoder, doc)
+    )
+    if (Y.length(encoder) > 0) {
+      websocket.send(Y.toBuffer(encoder))
+    }
+  }
+  websocket.onclose = () => {
+    doc.ws = null
+    doc.wsconnected = false
+    doc.emit('status', {
+      status: 'connected'
+    })
+    setTimeout(setupWS, reconnectTimeout, doc, url)
+  }
+  websocket.onopen = () => {
+    doc.wsconnected = true
+    doc.emit('status', {
+      status: 'disconnected'
+    })
+    // always send sync step 1 when connected
+    const encoder = Y.createEncoder()
+    Y.writeSyncStep1(encoder, doc)
+    websocket.send(Y.toBuffer(encoder))
+  }
+}
+
+const broadcastUpdate = (y, transaction) => {
+  if (y.wsconnected && transaction.encodedStructsLen > 0) {
+    y.mux(() => {
+      const encoder = Y.createEncoder()
+      Y.writeUpdate(encoder, transaction.encodedStructsLen, transaction.encodedStructs)
+      y.ws.send(Y.toBuffer(encoder))
+    })
+  }
+}
+
+class WebsocketsSharedDocument extends Y.Y {
+  constructor (url) {
+    super()
+    this.wsconnected = false
+    this.mux = Y.createMutex()
+    setupWS(this, url)
+    this.on('afterTransaction', broadcastUpdate)
+  }
+}
+
+export default class WebsocketProvider {
+  constructor (url) {
+    // ensure that url is always ends with /
+    while (url[url.length - 1] === '/') {
+      url = url.slice(0, url.length - 1)
+    }
+    this.url = url + '/'
+    /**
+     * @type {Map<string, WebsocketsSharedDocument>}
+     */
+    this.docs = new Map()
+  }
+  /**
+   * @param {string} name
+   * @return {WebsocketsSharedDocument}
+   */
+  get (name) {
+    let doc = this.docs.get(name)
+    if (doc === undefined) {
+      doc = new WebsocketsSharedDocument(this.url + name)
+    }
+    return doc
+  }
+}

provider/websocket/server.js

@@ -0,0 +1,53 @@
+const Y = require('../../build/node/index.js')
+const WebSocket = require('ws')
+const wss = new WebSocket.Server({ port: 1234 })
+const docs = new Map()
+
+const afterTransaction = (doc, transaction) => {
+  if (transaction.encodedStructsLen > 0) {
+    const encoder = Y.createEncoder()
+    Y.writeUpdate(encoder, transaction.encodedStructsLen, transaction.encodedStructs)
+    const message = Y.toBuffer(encoder)
+    doc.conns.forEach(conn => conn.send(message))
+  }
+}
+
+class WSSharedDoc extends Y.Y {
+  constructor () {
+    super()
+    this.mux = Y.createMutex()
+    this.conns = new Set()
+    this.on('afterTransaction', afterTransaction)
+  }
+}
+
+const messageListener = (conn, doc, message) => {
+  const encoder = Y.createEncoder()
+  const decoder = Y.createDecoder(message)
+  Y.readMessage(decoder, encoder, doc)
+  if (Y.length(encoder) > 0) {
+    conn.send(Y.toBuffer(encoder))
+  }
+}
+
+const setupConnection = (conn, req) => {
+  conn.binaryType = 'arraybuffer'
+  // get doc, create if it does not exist yet
+  let doc = docs.get(req.url.slice(1))
+  if (doc === undefined) {
+    doc = new WSSharedDoc()
+    docs.set(req.url.slice(1), doc)
+  }
+  doc.conns.add(conn)
+  // listen and reply to events
+  conn.on('message', message => messageListener(conn, doc, message))
+  conn.on('close', () =>
+    doc.conns.delete(conn)
+  )
+  // send sync step 1
+  const encoder = Y.createEncoder()
+  Y.writeSyncStep1(encoder, doc)
+  conn.send(Y.toBuffer(encoder))
+}
+
+wss.on('connection', setupConnection)

rollup.node.js

@@ -1,23 +1,12 @@
-import nodeResolve from 'rollup-plugin-node-resolve'
-import commonjs from 'rollup-plugin-commonjs'
-var pkg = require('./package.json')
+const pkg = require('./package.json')
 
 export default {
-  input: 'src/Y.dist.js',
-  nameame: 'Y',
-  sourcemap: true,
+  input: 'src/index.js',
   output: {
-    file: 'y.node.js',
-    format: 'cjs'
-  },
-  plugins: [
-    nodeResolve({
-      main: true,
-      module: true,
-      browser: true
-    }),
-    commonjs()
-  ],
+    name: 'Y',
+    file: 'build/node/index.js',
+    format: 'cjs',
+    sourcemap: true,
     banner: `
 /**
  * ${pkg.name} - ${pkg.description}
@@ -25,4 +14,5 @@ export default {
  * @license ${pkg.license}
  */
 `
+  }
 }

src/index.js

@@ -36,6 +36,10 @@ export { default as DomBinding } from './Bindings/DomBinding/DomBinding.js'
 
 export { default as domToType } from './Bindings/DomBinding/domToType.js'
 export { domsToTypes, switchAssociation } from './Bindings/DomBinding/util.js'
+export * from './message.js'
+export * from '../lib/encoding.js'
+export * from '../lib/decoding.js'
+export * from '../lib/mutex.js'
 
 // TODO: reorder (Item* should have low numbers)
 registerStruct(0, ItemJSON)