update pushy reference method (#499)

* update pushy reference method

* update

harmony/pushy/src/main/ets/PushyFileJSBundleProvider.ets

@@ -0,0 +1,54 @@
+import { HotReloadConfig, JSBundleProvider, JSBundleProviderError, JSPackagerClientConfig } from '@rnoh/react-native-openharmony';
+import fileIo from '@ohos.file.fs';
+import common from '@ohos.app.ability.common';
+import { UpdateContext } from './UpdateContext';
+
+export class PushyFileJSBundleProvider extends JSBundleProvider {
+  private updateContext: UpdateContext;
+  private filePath: string = ''
+
+  constructor(context: common.UIAbilityContext) {
+    super();
+    this.updateContext = new UpdateContext(context);
+  }
+  getURL(): string {
+    return this.updateContext.getBundleUrl();
+  }
+
+  async getBundle(): Promise<ArrayBuffer> {
+    try {
+      this.filePath =  this.updateContext.getBundleUrl();
+      const res = fileIo.accessSync(this.filePath);
+      if (res) {
+        const file = fileIo.openSync(this.filePath, fileIo.OpenMode.READ_ONLY);
+        try {
+          const stat = await fileIo.stat(this.filePath);
+          const fileSize = stat.size;
+          const buffer = new ArrayBuffer(fileSize);
+          const bytesRead = fileIo.readSync(file.fd, buffer, {
+            offset: 0,
+            length: fileSize
+          });
+          
+          if (bytesRead !== fileSize) {
+            throw new Error(`Failed to read entire file: read ${bytesRead} of ${fileSize} bytes`);
+          }
+          return buffer;
+        } finally {
+          fileIo.closeSync(file.fd);
+        }
+      }
+      throw new Error('Update bundle not found');
+    } catch (error) {
+      throw new JSBundleProviderError({
+        whatHappened: `Couldn't load JSBundle from ${this.filePath}`,
+        extraData: error,
+        howCanItBeFixed: [`Check if a bundle exists at "${this.filePath}" on your device.`]
+      })
+    }
+  }
+
+  getAppKeys(): string[] {
+    return [];
+  }
+}