# All files / src/tx/applyTx checkMinGasPrice.js

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     /**
     * Copyright (c) 2018-present, Leap DAO (leapdao.org)
     *
     * This source code is licensed under the Mozilla Public License Version 2.0
     * found in the LICENSE file in the root directory of this source tree.
     */

    const { Type } = require('leap-core');
    const { BigInt, equal } = require('jsbi-utils');

    module.exports = (state, tx, bridgeState) => {
      if (tx.type !== Type.MIN_GAS_PRICE) {
        throw new Error('minGasPrice tx expected');
      }

      if (state.gas.minPriceIndex + 1 !== bridgeState.minGasPrices.length - 1) {
        throw new Error('Unknown minGasPrice change');
      }

      if (
        !equal(
          BigInt(bridgeState.minGasPrices[state.gas.minPriceIndex + 1]),
          BigInt(tx.options.minGasPrice)
        )
      ) {
        throw new Error('Wrong minGasPrice');
      }

      state.gas.minPriceIndex += 1;
      state.gas.minPrice = BigInt(tx.options.minGasPrice).toString();
    };