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Add a new option to the config for capping the maximum difficulty. (#312)

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* consensus/ethash/consensus.go

* Add a new param to the config for capping the maximum difficulty.  This is useful for speeding up block creation on a test network.
This commit is contained in:
Thomas E Lackey 2023-02-01 21:53:42 -06:00 committed by i-norden
parent ce0be30207
commit 15a49346a8
2 changed files with 24 additions and 6 deletions
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9
consensus/ethash/consensus.go
View File

@ -31,6 +31,7 @@ import (
"github.com/ethereum/go-ethereum/consensus/misc"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/trie"
@ -330,7 +331,13 @@ func (ethash *Ethash) verifyHeader(chain consensus.ChainHeaderReader, header, pa
// the difficulty that a new block should have when created at time
// given the parent block's time and difficulty.
func (ethash *Ethash) CalcDifficulty(chain consensus.ChainHeaderReader, time uint64, parent *types.Header) *big.Int {
return CalcDifficulty(chain.Config(), time, parent)
var config = chain.Config()
var ret = CalcDifficulty(config, time, parent)
if nil != config.CappedMaximumDifficulty && ret.Cmp(config.CappedMaximumDifficulty) >= 0 {
log.Info(fmt.Sprintf("Using capped difficulty %d", config.CappedMaximumDifficulty))
return config.CappedMaximumDifficulty
}
return ret
}
// CalcDifficulty is the difficulty adjustment algorithm. It returns

21
params/config.go
View File

@ -270,16 +270,16 @@ var (
//
// This configuration is intentionally not using keyed fields to force anyone
// adding flags to the config to also have to set these fields.
AllEthashProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, nil, nil, false, new(EthashConfig), nil}
AllEthashProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, nil, nil, nil, false, new(EthashConfig), nil}
// AllCliqueProtocolChanges contains every protocol change (EIPs) introduced
// and accepted by the Ethereum core developers into the Clique consensus.
//
// This configuration is intentionally not using keyed fields to force anyone
// adding flags to the config to also have to set these fields.
AllCliqueProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, nil, nil, nil, nil, false, nil, &CliqueConfig{Period: 0, Epoch: 30000}}
AllCliqueProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, nil, nil, nil, nil, nil, false, nil, &CliqueConfig{Period: 0, Epoch: 30000}}
TestChainConfig = &ChainConfig{big.NewInt(1), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, nil, nil, false, new(EthashConfig), nil}
TestChainConfig = &ChainConfig{big.NewInt(1), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, nil, nil, nil, false, new(EthashConfig), nil}
TestRules = TestChainConfig.Rules(new(big.Int), false)
)
@ -377,6 +377,9 @@ type ChainConfig struct {
// the network that triggers the consensus upgrade.
TerminalTotalDifficulty *big.Int `json:"terminalTotalDifficulty,omitempty"`
// Cap the maximum total difficulty (for testnet use only).
CappedMaximumDifficulty *big.Int `json:"cappedMaximumDifficulty,omitempty"`
// TerminalTotalDifficultyPassed is a flag specifying that the network already
// passed the terminal total difficulty. Its purpose is to disable legacy sync
// even without having seen the TTD locally (safer long term).
@ -419,7 +422,11 @@ func (c *ChainConfig) String() string {
switch {
case c.Ethash != nil:
if c.TerminalTotalDifficulty == nil {
banner += "Consensus: Ethash (proof-of-work)\n"
if nil == c.CappedMaximumDifficulty {
banner += "Consensus: Ethash (proof-of-work)\n"
} else {
banner += fmt.Sprintf("Consensus: Ethash (proof-of-work, capped difficulty at %d)\n", c.CappedMaximumDifficulty)
}
} else if !c.TerminalTotalDifficultyPassed {
banner += "Consensus: Beacon (proof-of-stake), merging from Ethash (proof-of-work)\n"
} else {
@ -434,7 +441,11 @@ func (c *ChainConfig) String() string {
banner += "Consensus: Beacon (proof-of-stake), merged from Clique (proof-of-authority)\n"
}
default:
banner += "Consensus: unknown\n"
if nil == c.CappedMaximumDifficulty {
banner += "Consensus: unknown\n"
} else {
banner += fmt.Sprintf("Consensus: unknown (capped difficulty at %d)\n", c.CappedMaximumDifficulty)
}
}
banner += "\n"