110 lines
2.6 KiB
JavaScript
110 lines
2.6 KiB
JavaScript
// @flow
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import * as BufferLayout from 'buffer-layout';
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import {Transaction} from './transaction';
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import {PublicKey} from './publickey';
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import * as Layout from './layout';
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/**
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* Factory class for transactions to interact with the System program
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*/
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export class SystemProgram {
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/**
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* Public key that identifies the System program
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*/
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static get programId(): PublicKey {
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return new PublicKey(
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'0x000000000000000000000000000000000000000000000000000000000000000',
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);
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}
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/**
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* Generate a Transaction that creates a new account
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*/
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static createAccount(
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from: PublicKey,
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newAccount: PublicKey,
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lamports: number,
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space: number,
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programId: PublicKey,
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): Transaction {
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const dataLayout = BufferLayout.struct([
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BufferLayout.u32('instruction'),
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BufferLayout.ns64('lamports'),
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BufferLayout.ns64('space'),
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Layout.publicKey('programId'),
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]);
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const data = Buffer.alloc(dataLayout.span);
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dataLayout.encode(
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{
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instruction: 0, // Create Account instruction
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lamports,
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space,
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programId: programId.toBuffer(),
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},
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data,
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);
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return new Transaction().add({
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keys: [
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{pubkey: from, isSigner: true},
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{pubkey: newAccount, isSigner: false},
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],
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programId: SystemProgram.programId,
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data,
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});
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}
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/**
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* Generate a Transaction that moves lamports from one account to another
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*/
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static move(from: PublicKey, to: PublicKey, amount: number): Transaction {
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const dataLayout = BufferLayout.struct([
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BufferLayout.u32('instruction'),
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BufferLayout.ns64('amount'),
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]);
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const data = Buffer.alloc(dataLayout.span);
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dataLayout.encode(
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{
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instruction: 2, // Move instruction
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amount,
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},
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data,
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);
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return new Transaction().add({
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keys: [{pubkey: from, isSigner: true}, {pubkey: to, isSigner: false}],
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programId: SystemProgram.programId,
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data,
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});
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}
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/**
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* Generate a Transaction that assigns an account to a program
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*/
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static assign(from: PublicKey, programId: PublicKey): Transaction {
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const dataLayout = BufferLayout.struct([
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BufferLayout.u32('instruction'),
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Layout.publicKey('programId'),
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]);
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const data = Buffer.alloc(dataLayout.span);
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dataLayout.encode(
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{
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instruction: 1, // Assign instruction
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programId: programId.toBuffer(),
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},
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data,
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);
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return new Transaction().add({
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keys: [{pubkey: from, isSigner: true}],
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programId: SystemProgram.programId,
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data,
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});
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}
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}
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