github.com/amazechain/amc@v0.1.3/internal/miner/gasLimit.go (about)

     1  // Copyright 2022 The AmazeChain Authors
     2  // This file is part of the AmazeChain library.
     3  //
     4  // The AmazeChain library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The AmazeChain library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the AmazeChain library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package miner
    18  
    19  import "github.com/amazechain/amc/params"
    20  
    21  func CalcGasLimit(parentGasLimit, desiredLimit uint64) uint64 {
    22  	delta := parentGasLimit/params.GasLimitBoundDivisor - 1
    23  	limit := parentGasLimit
    24  	if desiredLimit < params.MinGasLimit {
    25  		desiredLimit = params.MinGasLimit
    26  	}
    27  	// If we're outside our allowed gas range, we try to hone towards them
    28  	if limit < desiredLimit {
    29  		limit = parentGasLimit + delta
    30  		if limit > desiredLimit {
    31  			limit = desiredLimit
    32  		}
    33  		return limit
    34  	}
    35  	if limit > desiredLimit {
    36  		limit = parentGasLimit - delta
    37  		if limit < desiredLimit {
    38  			limit = desiredLimit
    39  		}
    40  	}
    41  	return limit
    42  }