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-rw-r--r--consensus/ethash/consensus.go25
1 files changed, 20 insertions, 5 deletions
diff --git a/consensus/ethash/consensus.go b/consensus/ethash/consensus.go
index 01d97a470..b71420445 100644
--- a/consensus/ethash/consensus.go
+++ b/consensus/ethash/consensus.go
@@ -36,8 +36,9 @@ import (
// Ethash proof-of-work protocol constants.
var (
- blockReward *big.Int = big.NewInt(5e+18) // Block reward in wei for successfully mining a block
- maxUncles = 2 // Maximum number of uncles allowed in a single block
+ frontierBlockReward *big.Int = big.NewInt(5e+18) // Block reward in wei for successfully mining a block
+ metropolisBlockReward *big.Int = big.NewInt(3e+18) // Block reward in wei for successfully mining a block upward from Metropolis
+ maxUncles = 2 // Maximum number of uncles allowed in a single block
)
// Various error messages to mark blocks invalid. These should be private to
@@ -306,6 +307,7 @@ var (
big9 = big.NewInt(9)
big10 = big.NewInt(10)
bigMinus99 = big.NewInt(-99)
+ big2999999 = big.NewInt(2999999)
)
// calcDifficultyMetropolis is the difficulty adjustment algorithm. It returns
@@ -346,8 +348,15 @@ func calcDifficultyMetropolis(time uint64, parent *types.Header) *big.Int {
if x.Cmp(params.MinimumDifficulty) < 0 {
x.Set(params.MinimumDifficulty)
}
+ // calculate a fake block numer for the ice-age delay:
+ // https://github.com/ethereum/EIPs/pull/669
+ // fake_block_number = min(0, block.number - 3_000_000
+ 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
+ }
// for the exponential factor
- periodCount := new(big.Int).Add(parent.Number, big1)
+ periodCount := fakeBlockNumber
periodCount.Div(periodCount, expDiffPeriod)
// the exponential factor, commonly referred to as "the bomb"
@@ -501,7 +510,7 @@ func (ethash *Ethash) Prepare(chain consensus.ChainReader, header *types.Header)
// setting the final state and assembling the block.
func (ethash *Ethash) Finalize(chain consensus.ChainReader, header *types.Header, state *state.StateDB, txs []*types.Transaction, uncles []*types.Header, receipts []*types.Receipt) (*types.Block, error) {
// Accumulate any block and uncle rewards and commit the final state root
- AccumulateRewards(state, header, uncles)
+ AccumulateRewards(chain.Config(), state, header, uncles)
header.Root = state.IntermediateRoot(chain.Config().IsEIP158(header.Number))
// Header seems complete, assemble into a block and return
@@ -518,7 +527,13 @@ var (
// reward. The total reward consists of the static block reward and rewards for
// included uncles. The coinbase of each uncle block is also rewarded.
// TODO (karalabe): Move the chain maker into this package and make this private!
-func AccumulateRewards(state *state.StateDB, header *types.Header, uncles []*types.Header) {
+func AccumulateRewards(config *params.ChainConfig, state *state.StateDB, header *types.Header, uncles []*types.Header) {
+ // Select the correct block reward based on chain progression
+ blockReward := frontierBlockReward
+ if config.IsMetropolis(header.Number) {
+ blockReward = metropolisBlockReward
+ }
+ // Accumulate the rewards for the miner and any included uncles
reward := new(big.Int).Set(blockReward)
r := new(big.Int)
for _, uncle := range uncles {