39 lines
1.5 KiB
TypeScript
39 lines
1.5 KiB
TypeScript
import { constants } from '@0x/contracts-test-utils';
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import { assetDataUtils } from '@0x/order-utils';
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import { StaticCallAssetData } from '@0x/types';
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import { AbiEncoder, BigNumber } from '@0x/utils';
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const customGasPriceEncoder = AbiEncoder.createMethod('checkGasPrice', [{ name: 'maxGasPrice', type: 'uint256' }]);
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const defaultGasPriceEncoder = AbiEncoder.createMethod('checkGasPrice', []);
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const ONE_GWEI = new BigNumber(10 ** 9);
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export const TWENTY_GWEI = ONE_GWEI.times(20);
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/**
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* Encodes the given stop limit data parameters into StaticCall asset data so that it can be used
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* in a 0x order.
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*/
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export function encodeMaxGasPriceStaticCallData(maxGasPriceContractAddress: string, maxGasPrice?: BigNumber): string {
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const staticCallData =
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maxGasPrice === undefined ? defaultGasPriceEncoder.encode({}) : customGasPriceEncoder.encode({ maxGasPrice });
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return assetDataUtils.encodeStaticCallAssetData(
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maxGasPriceContractAddress,
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staticCallData,
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constants.KECCAK256_NULL,
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);
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}
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/**
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* Decodes the maxGasPrice StaticCall asset data.
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*/
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export function decodeMaxGasPriceStaticCallData(assetData: string): BigNumber {
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// tslint:disable-next-line:no-unnecessary-type-assertion
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const { staticCallData } = assetDataUtils.decodeAssetDataOrThrow(assetData) as StaticCallAssetData;
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try {
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return customGasPriceEncoder.strictDecode<BigNumber>(staticCallData);
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} catch (e) {
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defaultGasPriceEncoder.strictDecode(staticCallData);
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return TWENTY_GWEI;
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}
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}
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