Fix new sync client with RNQS

.changeset/weak-chairs-complain.md

@@ -0,0 +1,5 @@
+---
+'@powersync/react-native': patch
+---
+
+Fix issues forwarding array buffers to Rust sync client.

demos/react-native-supabase-todolist/library/powersync/system.ts

@@ -1,6 +1,6 @@
 import '@azure/core-asynciterator-polyfill';
 
-import { createBaseLogger, LogLevel, PowerSyncDatabase } from '@powersync/react-native';
+import { createBaseLogger, LogLevel, PowerSyncDatabase, SyncClientImplementation } from '@powersync/react-native';
 import React from 'react';
 import { SupabaseStorageAdapter } from '../storage/SupabaseStorageAdapter';
 
@@ -68,7 +68,7 @@ export class System {
 
   async init() {
     await this.powersync.init();
-    await this.powersync.connect(this.supabaseConnector);
+    await this.powersync.connect(this.supabaseConnector, { clientImplementation: SyncClientImplementation.RUST });
 
     if (this.attachmentQueue) {
       await this.attachmentQueue.init();

packages/react-native/src/db/PowerSyncDatabase.ts

@@ -5,12 +5,12 @@ import {
   DBAdapter,
   PowerSyncBackendConnector,
   PowerSyncDatabaseOptionsWithSettings,
-  type RequiredAdditionalConnectionOptions,
-  SqliteBucketStorage
+  type RequiredAdditionalConnectionOptions
 } from '@powersync/common';
 import { ReactNativeRemote } from '../sync/stream/ReactNativeRemote';
 import { ReactNativeStreamingSyncImplementation } from '../sync/stream/ReactNativeStreamingSyncImplementation';
 import { ReactNativeQuickSqliteOpenFactory } from './adapters/react-native-quick-sqlite/ReactNativeQuickSQLiteOpenFactory';
+import { ReactNativeBucketStorageAdapter } from './../sync/bucket/ReactNativeBucketStorageAdapter';
 
 /**
  * A PowerSync database which provides SQLite functionality
@@ -39,7 +39,7 @@ export class PowerSyncDatabase extends AbstractPowerSyncDatabase {
   }
 
   protected generateBucketStorageAdapter(): BucketStorageAdapter {
-    return new SqliteBucketStorage(this.database, AbstractPowerSyncDatabase.transactionMutex);
+    return new ReactNativeBucketStorageAdapter(this.database, AbstractPowerSyncDatabase.transactionMutex);
   }
 
   protected generateSyncStreamImplementation(

packages/react-native/src/sync/bucket/ReactNativeBucketStorageAdapter.ts

@@ -0,0 +1,13 @@
+import { PowerSyncControlCommand, SqliteBucketStorage } from '@powersync/common';
+
+export class ReactNativeBucketStorageAdapter extends SqliteBucketStorage {
+  control(op: PowerSyncControlCommand, payload: string | ArrayBuffer | null): Promise<string> {
+    if (payload != null && typeof payload != 'string') {
+      // For some reason, we need to copy array buffers for RNQS to recognize them. We're doing that here because we
+      // don't want to pay the cost of a copy on platforms where it's not necessary.
+      payload = new Uint8Array(payload).buffer;
+    }
+
+    return super.control(op, payload);
+  }
+}