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Merge pull request #17675 from holiman/eip1234

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Eip1234
This commit is contained in:
Péter Szilágyi 2018-09-17 15:18:17 +03:00 committed by GitHub
commit 41ac8dd803
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1 changed files with 78 additions and 56 deletions
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42
consensus/ethash/consensus.go
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@ -40,8 +40,22 @@ import (
var (
FrontierBlockReward = big.NewInt(5e+18) // Block reward in wei for successfully mining a block
ByzantiumBlockReward = big.NewInt(3e+18) // Block reward in wei for successfully mining a block upward from Byzantium
ConstantinopleBlockReward = big.NewInt(2e+18) // Block reward in wei for successfully mining a block upward from Constantinople
maxUncles = 2 // Maximum number of uncles allowed in a single block
allowedFutureBlockTime = 15 * time.Second // Max time from current time allowed for blocks, before they're considered future blocks
// calcDifficultyConstantinople is the difficulty adjustment algorithm for Constantinople.
// It returns the difficulty that a new block should have when created at time given the
// parent block's time and difficulty. The calculation uses the Byzantium rules, but with
// bomb offset 5M.
// Specification EIP-1234: https://eips.ethereum.org/EIPS/eip-1234
calcDifficultyConstantinople = makeDifficultyCalculator(big.NewInt(5000000))
// calcDifficultyByzantium is the difficulty adjustment algorithm. It returns
// the difficulty that a new block should have when created at time given the
// parent block's time and difficulty. The calculation uses the Byzantium rules.
// Specification EIP-649: https://eips.ethereum.org/EIPS/eip-649
calcDifficultyByzantium = makeDifficultyCalculator(big.NewInt(3000000))
)
// Various error messages to mark blocks invalid. These should be private to
@ -299,6 +313,8 @@ func (ethash *Ethash) CalcDifficulty(chain consensus.ChainReader, time uint64, p
func CalcDifficulty(config *params.ChainConfig, time uint64, parent *types.Header) *big.Int {
next := new(big.Int).Add(parent.Number, big1)
switch {
case config.IsConstantinople(next):
return calcDifficultyConstantinople(time, parent)
case config.IsByzantium(next):
return calcDifficultyByzantium(time, parent)
case config.IsHomestead(next):
@ -316,13 +332,16 @@ var (
big9 = big.NewInt(9)
big10 = big.NewInt(10)
bigMinus99 = big.NewInt(-99)
big2999999 = big.NewInt(2999999)
)
// calcDifficultyByzantium is the difficulty adjustment algorithm. It returns
// the difficulty that a new block should have when created at time given the
// parent block's time and difficulty. The calculation uses the Byzantium rules.
func calcDifficultyByzantium(time uint64, parent *types.Header) *big.Int {
// makeDifficultyCalculator creates a difficultyCalculator with the given bomb-delay.
// the difficulty is calculated with Byzantium rules, which differs from Homestead in
// how uncles affect the calculation
func makeDifficultyCalculator(bombDelay *big.Int) func(time uint64, parent *types.Header) *big.Int {
// Note, the calculations below looks at the parent number, which is 1 below
// the block number. Thus we remove one from the delay given
bombDelayFromParent := new(big.Int).Sub(bombDelay, big1)
return func(time uint64, parent *types.Header) *big.Int {
// https://github.com/ethereum/EIPs/issues/100.
// algorithm:
// diff = (parent_diff +
@ -357,12 +376,11 @@ func calcDifficultyByzantium(time uint64, parent *types.Header) *big.Int {
if x.Cmp(params.MinimumDifficulty) < 0 {
x.Set(params.MinimumDifficulty)
}
// calculate a fake block number for the ice-age delay:
// https://github.com/ethereum/EIPs/pull/669
// fake_block_number = max(0, block.number - 3_000_000)
// calculate a fake block number for the ice-age delay
// Specification: https://eips.ethereum.org/EIPS/eip-1234
fakeBlockNumber := new(big.Int)
if parent.Number.Cmp(big2999999) >= 0 {
fakeBlockNumber = fakeBlockNumber.Sub(parent.Number, big2999999) // Note, parent is 1 less than the actual block number
if parent.Number.Cmp(bombDelayFromParent) >= 0 {
fakeBlockNumber = fakeBlockNumber.Sub(parent.Number, bombDelayFromParent)
}
// for the exponential factor
periodCount := fakeBlockNumber
@ -377,6 +395,7 @@ func calcDifficultyByzantium(time uint64, parent *types.Header) *big.Int {
}
return x
}
}
// calcDifficultyHomestead is the difficulty adjustment algorithm. It returns
// the difficulty that a new block should have when created at time given the
@ -592,6 +611,9 @@ func accumulateRewards(config *params.ChainConfig, state *state.StateDB, header
if config.IsByzantium(header.Number) {
blockReward = ByzantiumBlockReward
}
if config.IsConstantinople(header.Number) {
blockReward = ConstantinopleBlockReward
}
// Accumulate the rewards for the miner and any included uncles
reward := new(big.Int).Set(blockReward)
r := new(big.Int)