leap-node/src/tx/applyTx/checkEpochLength.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');

module.exports = (state, tx, bridgeState) => {
  if (tx.type !== Type.EPOCH_LENGTH_V1) {
    throw new Error('epochLength tx V1 expected');
  }

  const [expectedEpochLength] = bridgeState.epochLengths[
    state.epoch.epochLengthIndex + 1
  ];
  const { epochLength } = tx.options;
  if (expectedEpochLength !== epochLength) {
    throw new Error('Wrong epoch length');
  }

  state.epoch.epochLengthIndex += 1;
  state.epoch.epochLength = tx.options.epochLength;
};