92 lines
2.0 KiB
JavaScript
92 lines
2.0 KiB
JavaScript
// @flow
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import * as BufferLayout from 'buffer-layout';
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/**
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* Layout for a public key
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*/
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export const publicKey = (property: string = 'publicKey'): Object => {
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return BufferLayout.blob(32, property);
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};
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/**
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* Layout for a 64bit unsigned value
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*/
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export const uint64 = (property: string = 'uint64'): Object => {
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return BufferLayout.blob(8, property);
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};
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/**
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* Layout for a Rust String type
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*/
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export const rustString = (property: string = 'string') => {
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const rsl = BufferLayout.struct(
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[
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BufferLayout.u32('length'),
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BufferLayout.u32('lengthPadding'),
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BufferLayout.blob(BufferLayout.offset(BufferLayout.u32(), -8), 'chars'),
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],
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property,
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);
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const _decode = rsl.decode.bind(rsl);
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const _encode = rsl.encode.bind(rsl);
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rsl.decode = (buffer, offset) => {
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const data = _decode(buffer, offset);
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return data.chars.toString('utf8');
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};
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rsl.encode = (str, buffer, offset) => {
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const data = {
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chars: Buffer.from(str, 'utf8'),
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};
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return _encode(data, buffer, offset);
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};
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rsl.alloc = str => {
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return (
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BufferLayout.u32().span +
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BufferLayout.u32().span +
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Buffer.from(str, 'utf8').length
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);
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};
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return rsl;
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};
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/**
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* Layout for an Authorized object
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*/
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export const authorized = (property: string = 'authorized') => {
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return BufferLayout.struct(
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[publicKey('staker'), publicKey('withdrawer')],
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property,
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);
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};
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/**
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* Layout for a Lockup object
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*/
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export const lockup = (property: string = 'lockup') => {
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return BufferLayout.struct(
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[
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BufferLayout.ns64('unixTimestamp'),
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BufferLayout.ns64('epoch'),
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publicKey('custodian'),
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],
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property,
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);
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};
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export function getAlloc(type: Object, fields: Object): number {
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let alloc = 0;
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type.layout.fields.forEach(item => {
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if (item.span >= 0) {
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alloc += item.span;
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} else if (typeof item.alloc === 'function') {
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alloc += item.alloc(fields[item.property]);
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}
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});
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return alloc;
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}
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