fix(sync): yjs messages are Uint8Arrays in the queue

Remove duplicate encoding for updateMessage

Signed-off-by: Max <[email protected]>
Signed-off-by: Jonas <[email protected]>

Author: max-nextcloud

cypress/component/helpers/yjs.cy.js

@@ -70,7 +70,7 @@ describe('Yjs base64 wrapped with our helpers', function() {
 		const stateA = getDocumentState(source)
 		const update0A = getUpdateMessage(source, state0)
 		const updateAA = getUpdateMessage(source, stateA)
-		expect(update0A.length).to.be.eq(40)
+		expect(update0A.length).to.be.eq(29)
 		expect(updateAA).to.be.eq(undefined)
 	})
 

src/helpers/yjs.js

@@ -21,7 +21,11 @@
  */
 
 import { encodeArrayBuffer, decodeArrayBuffer } from '../helpers/base64.js'
-import { Doc, encodeStateAsUpdate, applyUpdate } from 'yjs'
+import * as Y from 'yjs'
+import * as decoding from 'lib0/decoding.js'
+import * as encoding from 'lib0/encoding.js'
+import * as syncProtocol from 'y-protocols/sync'
+import { messageSync } from 'y-websocket'
 
 /**
  * Get Document state encode as base64.
@@ -51,7 +55,7 @@ export function applyDocumentState(ydoc, documentState, origin) {
  *
  * @param {Y.Doc} ydoc - encode state of this doc
  * @param {string} encodedBaseUpdate - base64 encoded doc update to build upon
- * @return {string|undefined}
+ * @return {Uint8Array|undefined}
  */
 export function getUpdateMessage(ydoc, encodedBaseUpdate) {
 	const baseUpdate = decodeArrayBuffer(encodedBaseUpdate)
@@ -65,21 +69,19 @@ export function getUpdateMessage(ydoc, encodedBaseUpdate) {
 	encoding.writeVarUint(encoder, messageSync)
 	const update = Y.encodeStateAsUpdate(ydoc, baseStateVector)
 	syncProtocol.writeUpdate(encoder, update)
-	const buf = encoding.toUint8Array(encoder)
-	return encodeArrayBuffer(buf)
+	return encoding.toUint8Array(encoder)
 }
 
 /**
  * Apply an updated message to the ydoc.
  *
  * Only used in tests right now.
  * @param {Y.Doc} ydoc - encode state of this doc
- * @param {string} updateMessage - base64 encoded y-websocket sync message with update
+ * @param {Uint8Array} updateMessage - y-websocket sync message with update
  * @param {object} origin - initiator object e.g. WebsocketProvider
  */
 export function applyUpdateMessage(ydoc, updateMessage, origin = 'origin') {
-	const updateBuffer = decodeArrayBuffer(updateMessage)
-	const decoder = decoding.createDecoder(updateBuffer)
+	const decoder = decoding.createDecoder(updateMessage)
 	const messageType = decoding.readVarUint(decoder)
 	if (messageType !== messageSync) {
 		console.error('y.js update message with invalid type', messageType)
@@ -94,3 +96,13 @@ export function applyUpdateMessage(ydoc, updateMessage, origin = 'origin') {
 		origin,
 	)
 }
+
+/**
+ * Helper function to check if two state vectors have the same state
+ * @param {Array} arr - state vector to compare
+ * @param {Array} other - state vector to compare against
+ */
+function sameState(arr, other) {
+	return arr.length === other.length
+		&& arr.every((value, index) => other[index] === value)
+}