Dynamic fee selection method

dynamic-fee-matcher.js

/**
 * Determine if transaction matches the accepted fee by delegate or max fee set by sender
 * @param {Transaction} Transaction - transaction to check
 * @return {Boolean} matches T/F
 */
 module.exports = (transaction) => {
  const transactionFee = transaction.fee.toNumber()
  const staticFee = feeManager.getForTransaction(transaction)
  const blockchain = container.resolvePlugin('blockchain')
  const feeConstants = config.getConstants(blockchain.getLastBlock().data.height).fees

  if (!feeConstants.dynamic && transactionFee !== staticFee) {
    logger.debug(`Received transaction fee '${transactionFee}' for '${transaction.id}' does not match static fee of '${staticFee}'`)
    return false
  }

  if (feeConstants.dynamic) {
    const calculatedFee = dynamicFeeManager.calculateFee(config.delegates.dynamicFees.feeMultiplier, transaction)

    if (transactionFee < config.delegates.dynamicFees.minAcceptableFee) {
      logger.debug(`Fee declined - Received transaction "${transaction.id}" with a fee of "${transactionFee}" which is below the minimum accepted fee of "${config.delegates.dynamicFees.minAcceptableFee}" by this delegate.`)
      return false
    }

    if (calculatedFee > transactionFee) {
      logger.debug(`Fee declined - Received transaction "${transaction.id}" with a fee of "${transactionFee}" which is below the calculated fee of "${calculatedFee}".`)
      return false
    }

    if (transactionFee > staticFee) {
      logger.debug(`Fee declined - Received transaction "${transaction.id}" with a fee of "${transactionFee}" which is higher than the static fee of "${feeManager.get(transaction.type)}".`)
      return false
    }

    logger.debug(`Transaction "${transaction.id}" accepted with fee of "${transactionFee}". The calculated fee is "${calculatedFee}".`)
  }
  return true
}