fix: catch up to recent upstream changes

web3.js/src/loader.js

@@ -0,0 +1,97 @@
+// @flow
+
+import * as BufferLayout from 'buffer-layout';
+
+import {PublicKey, Transaction} from '.';
+import {sendAndConfirmTransaction} from './util/send-and-confirm-transaction';
+import type {Account, Connection} from '.';
+
+/**
+ * Program loader interface
+ */
+export class Loader {
+  /**
+   * @private
+   */
+  connection: Connection;
+
+  /**
+   * @private
+   */
+  programId: PublicKey;
+
+  /**
+   * @param connection The connection to use
+   * @param programId Public key that identifies the loader
+   */
+  constructor(connection: Connection, programId: PublicKey) {
+    Object.assign(this, {connection, programId});
+  }
+
+  /**
+   * Load program data
+   *
+   * @param program Account to load the program info
+   * @param offset Account userdata offset to write `bytes` into
+   * @param bytes Program data
+   */
+  async load(program: Account, offset: number, bytes: Array<number>) {
+    const userdataLayout = BufferLayout.struct([
+      BufferLayout.u32('instruction'),
+      BufferLayout.u32('offset'),
+      BufferLayout.u32('bytesLength'),
+      BufferLayout.u32('bytesLengthPadding'),
+      BufferLayout.seq(
+        BufferLayout.u8('byte'),
+        BufferLayout.offset(BufferLayout.u32(), -8),
+        'bytes'
+      ),
+    ]);
+
+    let userdata = Buffer.alloc(bytes.length + 16);
+    userdataLayout.encode(
+      {
+        instruction: 0, // Load instruction
+        offset,
+        bytes,
+      },
+      userdata,
+    );
+
+    const transaction = new Transaction({
+      fee: 0,
+      keys: [program.publicKey],
+      programId: this.programId,
+      userdata,
+    });
+    await sendAndConfirmTransaction(this.connection, program, transaction);
+  }
+
+  /**
+   * Finalize an account loaded with program data for execution
+   *
+   * @param program `load()`ed Account
+   */
+  async finalize(program: Account) {
+    const userdataLayout = BufferLayout.struct([
+      BufferLayout.u32('instruction'),
+    ]);
+
+    const userdata = Buffer.alloc(userdataLayout.span);
+    console.log('sp',userdataLayout.span);
+    userdataLayout.encode(
+      {
+        instruction: 1, // Finalize instruction
+      },
+      userdata,
+    );
+
+    const transaction = new Transaction({
+      fee: 0,
+      keys: [program.publicKey],
+      programId: this.programId,
+      userdata,
+    });
+    await sendAndConfirmTransaction(this.connection, program, transaction);
+  }
+}