56 lines
1.5 KiB
JavaScript
56 lines
1.5 KiB
JavaScript
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// @flow
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import fs from 'mz/fs';
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import elfy from 'elfy';
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import {Account, PublicKey, Loader, SystemProgram} from '.';
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import {sendAndConfirmTransaction} from './util/send-and-confirm-transaction';
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import type {Connection} from '.';
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/**
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* Factory class for transactions to interact with a program loader
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*/
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export class BpfLoader {
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/**
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* Public key that identifies the NativeLoader
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*/
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static get programId(): PublicKey {
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return new PublicKey('0x0606060606060606060606060606060606060606060606060606060606060606');
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}
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/**
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* Loads a BPF program
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*
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* @param connection The connection to use
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* @param owner User account to load the program with
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* @param programName Name of the BPF program
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*/
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static async load(
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connection: Connection,
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owner: Account,
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programName: string,
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): Promise<PublicKey> {
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const programAccount = new Account();
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const data = await fs.readFile(programName);
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const elf = elfy.parse(data);
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const section = elf.body.sections.find(section => section.name === '.text.entrypoint');
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// Allocate memory for the program account
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const transaction = SystemProgram.createAccount(
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owner.publicKey,
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programAccount.publicKey,
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1,
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section.data.length,
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BpfLoader.programId,
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);
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await sendAndConfirmTransaction(connection, owner, transaction);
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const loader = new Loader(connection, BpfLoader.programId);
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await loader.load(programAccount, section.data);
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await loader.finalize(programAccount);
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return programAccount.publicKey;
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}
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}
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