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Refactor to follow API conventions from other YJS providers.
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98 changes: 98 additions & 0 deletions
98
demos/powersync-supabase-yjs-text-collab-demo/src/library/powersync/PowerSyncYjsProvider.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
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| import * as Y from 'yjs'; | ||
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| import { b64ToUint8Array, Uint8ArrayTob64 } from '@/library/binary-utils'; | ||
| import { v4 as uuidv4 } from 'uuid'; | ||
| import { AbstractPowerSyncDatabase } from '@journeyapps/powersync-sdk-web'; | ||
| import { ObservableV2 } from 'lib0/observable' | ||
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| export interface PowerSyncYjsEvents { | ||
| /** | ||
| * Triggered when document contents have been loaded from the database the first time. | ||
| * | ||
| * The document data may not have been synced from the PowerSync service at this point. | ||
| */ | ||
| synced: () => void; | ||
| } | ||
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| /** | ||
| * Configure bidirectional sync for a Yjs document with a PowerSync database. | ||
| * | ||
| * Updates are stored in the `document_updates` table in the database. | ||
| * | ||
| * @param ydoc | ||
| * @param db | ||
| * @param documentId | ||
| */ | ||
| export class PowerSyncYjsProvider extends ObservableV2<PowerSyncYjsEvents> { | ||
| private seenDocUpdates = new Set<string>(); | ||
| private abortController = new AbortController(); | ||
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| constructor(public readonly doc: Y.Doc, public readonly db: AbstractPowerSyncDatabase, public readonly documentId: string) { | ||
| super(); | ||
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| const updates = db.watch('SELECT * FROM document_updates WHERE document_id = ?', [documentId], { signal: this.abortController.signal }); | ||
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| this._storeUpdate = this._storeUpdate.bind(this); | ||
| this.destroy = this.destroy.bind(this); | ||
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| let synced = false; | ||
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| const watchLoop = async () => { | ||
| for await (let results of updates) { | ||
| if (this.abortController.signal.aborted) { | ||
| break; | ||
| } | ||
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| // New data detected in the database | ||
| for (let update of results.rows!._array) { | ||
| // Ignore any updates we've already seen | ||
| if (!this.seenDocUpdates.has(update.id)) { | ||
| this.seenDocUpdates.add(update.id); | ||
| // apply the update from the database to the doc | ||
| const origin = this; | ||
| Y.applyUpdateV2(doc, b64ToUint8Array(update.update_b64), origin); | ||
| } | ||
| } | ||
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| if (!synced) { | ||
| synced = true; | ||
| this.emit('synced', []); | ||
| } | ||
| } | ||
| } | ||
| watchLoop(); | ||
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| doc.on('updateV2', this._storeUpdate); | ||
| doc.on('destroy', this.destroy) | ||
| } | ||
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| private async _storeUpdate(update: Uint8Array, origin: any) { | ||
| if (origin === this) { | ||
| // update originated from the database / PowerSync - ignore | ||
| return; | ||
| } | ||
| // update originated from elsewhere - save to the database | ||
| const docUpdateId = uuidv4(); | ||
| this.seenDocUpdates.add(docUpdateId); | ||
| await this.db.execute('INSERT INTO document_updates(id, document_id, update_b64) VALUES(?, ?, ?)', [docUpdateId, this.documentId, Uint8ArrayTob64(update)]); | ||
| } | ||
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| /** | ||
| * Destroy this persistence provider, removing any attached event listeners. | ||
| */ | ||
| destroy() { | ||
| this.abortController.abort(); | ||
| this.doc.off('updateV2', this._storeUpdate) | ||
| this.doc.off('destroy', this.destroy) | ||
| } | ||
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| /** | ||
| * Delete data associated with this document from the database. | ||
| * | ||
| * Also call `destroy()` to remove any event listeners and prevent future updates to the database. | ||
| */ | ||
| async deleteData() { | ||
| await this.db.execute('DELETE FROM document_updates WHERE document_id = ?', [this.documentId]); | ||
| } | ||
| } |
56 changes: 0 additions & 56 deletions
56
demos/powersync-supabase-yjs-text-collab-demo/src/library/powersync/powersyncYjs.ts
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