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refactor: save ydoc state in the database, so it can be restored easier

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By storing the ydoc state in the database we can reconnect lost clients easier
and enable offline editing because we continue using the crdt data that has been
used by the client before the connection loss.

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>
This commit is contained in:
Tilman Vatteroth 2023-03-24 10:26:49 +01:00
parent 4707540237
commit a826677225
26 changed files with 301 additions and 204 deletions
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11
commons/src/message-transporters/mocked-backend-message-transporter.ts
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@ -6,14 +6,13 @@
import { RealtimeDoc } from '../y-doc-sync/realtime-doc.js'
import { ConnectionState, MessageTransporter } from './message-transporter.js'
import { Message, MessageType } from './message.js'
import { Doc, encodeStateAsUpdate } from 'yjs'
/**
* A mocked connection that doesn't send or receive any data and is instantly ready.
* The only exception is the note content state request that is answered with the given initial content.
*/
export class MockedBackendMessageTransporter extends MessageTransporter {
private readonly doc: Doc
private readonly doc: RealtimeDoc
private connected = true
@ -41,10 +40,10 @@ export class MockedBackendMessageTransporter extends MessageTransporter {
sendMessage<M extends MessageType>(content: Message<M>) {
if (content.type === MessageType.NOTE_CONTENT_STATE_REQUEST) {
setTimeout(() => {
const payload = Array.from(
encodeStateAsUpdate(this.doc, new Uint8Array(content.payload))
)
this.receiveMessage({ type: MessageType.NOTE_CONTENT_UPDATE, payload })
this.receiveMessage({
type: MessageType.NOTE_CONTENT_UPDATE,
payload: this.doc.encodeStateAsUpdate(content.payload)
})
}, 10)
}
}