fix(api): send remaining steps before closing connection

y.js will send a last awareness update when closing the websocket.
Try to get this out before closing the sync service connection.

Signed-off-by: Max <max@nextcloud.com>
Signed-off-by: Jonas <jonas@freesources.org>

Author: max-nextcloud

src/services/SyncService.js

@@ -152,16 +152,16 @@ class SyncService {
 		return new Promise((resolve, reject) => {
 			this.#sendIntervalId = setInterval(() => {
 				if (this.connection && !this.sending) {
-					clearInterval(this.#sendIntervalId)
-					this.#sendIntervalId = null
-					this._sendSteps(getSendable).then(resolve).catch(reject)
+					this.sendStepsNow(getSendable).then(resolve).catch(reject)
 				}
 			}, 200)
 		})
 	}
 
-	_sendSteps(getSendable) {
+	sendStepsNow(getSendable) {
 		this.sending = true
+		clearInterval(this.#sendIntervalId)
+		this.#sendIntervalId = null
 		const data = getSendable()
 		if (data.steps.length > 0) {
 			this.emit('stateChange', { dirty: true })

src/services/WebSocketPolyfill.js

@@ -82,7 +82,7 @@ export default function initWebSocketPolyfill(syncService, fileId, initialSessio
 		send(...data) {
 			this.#queue.push(...data)
 			let outbox = []
-			syncService.sendSteps(() => {
+			return syncService.sendSteps(() => {
 				outbox = [...this.#queue]
 				const data = {
 					steps: this.#steps,
@@ -109,7 +109,8 @@ export default function initWebSocketPolyfill(syncService, fileId, initialSessio
 				.findLast(s => s > 'AQ') || ''
 		}
 
-		close() {
+		async close() {
+			await this.#sendRemainingSteps()
 			Object.entries(this.#handlers)
 				.forEach(([key, value]) => syncService.off(key, value))
 			this.#handlers = []
@@ -119,5 +120,22 @@ export default function initWebSocketPolyfill(syncService, fileId, initialSessio
 			logger.debug('Websocket closed')
 		}
 
+		#sendRemainingSteps() {
+			if (this.#queue.length) {
+				return syncService.sendStepsNow(() => {
+					const data = {
+						steps: this.#steps,
+						awareness: this.#awareness,
+						version: this.#version,
+					}
+					this.#queue = []
+					logger.debug('sending final steps ', data)
+					return data
+				})?.catch(err => {
+					logger.error(err)
+				})
+			}
+		}
+
 	}
 }