66 lines
2.4 KiB
TypeScript
66 lines
2.4 KiB
TypeScript
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import { ChainId, defaultWithdrawalGasLimit } from './config';
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import { TornadoFeeOracle } from './feeOracle';
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import { ITornadoFeeOracle, GasPrice, TransactionData, TxType, LegacyGasPrices, LegacyGasPriceKey } from './types';
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import { GasPriceOracle } from '@tornado/gas-price-oracle';
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import { BigNumber } from 'ethers';
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import { bump } from './utils';
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export class TornadoFeeOracleV5 extends TornadoFeeOracle implements ITornadoFeeOracle {
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public constructor(chainId: number, rpcUrl: string, defaultGasPrices?: LegacyGasPrices) {
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const oracleConfig = {
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chainId,
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defaultRpc: rpcUrl,
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minPriority: chainId === 1 || chainId === 5 ? 2 : 0.05,
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percentile: 5,
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blocksCount: 20,
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defaultFallbackGasPrices: defaultGasPrices,
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};
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const gasPriceOracle = new GasPriceOracle(oracleConfig);
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super(chainId, rpcUrl, gasPriceOracle);
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}
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async getGasLimit(tx?: TransactionData, type: TxType = 'other', bumpPercent: number = 20): Promise<BigNumber> {
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if (!tx) return BigNumber.from(21_000);
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/* Relayer gas limit must be lower so that fluctuations in gas price cannot lead to the fact that
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* the relayer will actually pay for gas more than the money allocated for this by the user
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* (that is, in fact, relayer will pay for gas from his own money, unless we make the bump percent less for him)
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*/
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if (type === 'relayer_withdrawal') bumpPercent = 10;
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if (type === 'user_withdrawal') bumpPercent = 30;
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try {
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const fetchedGasLimit = await this.provider.estimateGas(tx);
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return bump(fetchedGasLimit, bumpPercent);
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} catch (e) {
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if (type.endsWith('withdrawal')) return bump(defaultWithdrawalGasLimit[this.chainId], bumpPercent);
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return BigNumber.from(21_000);
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}
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}
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async getGasPrice(
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type: TxType = 'other',
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speed: LegacyGasPriceKey = 'fast',
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bumpPercent?: number,
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): Promise<GasPrice> {
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// Only if bump percent didn't provided (if user provides 0, no need to recalculate)
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if (bumpPercent === undefined) {
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switch (this.chainId) {
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case ChainId.GOERLI:
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bumpPercent = type === 'user_withdrawal' ? 100 : 50;
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break;
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case ChainId.POLYGON:
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case ChainId.AVAX:
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case ChainId.XDAI:
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bumpPercent = 30;
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break;
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default:
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bumpPercent = 10;
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}
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}
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return super.getGasPrice(type, speed, bumpPercent);
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}
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}
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