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params: make eip1559 configurable #25822

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params: make eip1559 configurable #25822

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8 changes: 4 additions & 4 deletions consensus/misc/eip1559.go
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Original file line number Diff line number Diff line change
Expand Up @@ -33,7 +33,7 @@ func VerifyEip1559Header(config *params.ChainConfig, parent, header *types.Heade
// Verify that the gas limit remains within allowed bounds
parentGasLimit := parent.GasLimit
if !config.IsLondon(parent.Number) {
parentGasLimit = parent.GasLimit * params.ElasticityMultiplier
parentGasLimit = parent.GasLimit * config.ElasticityMultiplier()
}
if err := VerifyGaslimit(parentGasLimit, header.GasLimit); err != nil {
return err
Expand All @@ -58,7 +58,7 @@ func CalcBaseFee(config *params.ChainConfig, parent *types.Header) *big.Int {
return new(big.Int).SetUint64(params.InitialBaseFee)
}

parentGasTarget := parent.GasLimit / params.ElasticityMultiplier
parentGasTarget := parent.GasLimit / config.ElasticityMultiplier()
// If the parent gasUsed is the same as the target, the baseFee remains unchanged.
if parent.GasUsed == parentGasTarget {
return new(big.Int).Set(parent.BaseFee)
Expand All @@ -75,7 +75,7 @@ func CalcBaseFee(config *params.ChainConfig, parent *types.Header) *big.Int {
num.SetUint64(parent.GasUsed - parentGasTarget)
num.Mul(num, parent.BaseFee)
num.Div(num, denom.SetUint64(parentGasTarget))
num.Div(num, denom.SetUint64(params.BaseFeeChangeDenominator))
num.Div(num, denom.SetUint64(config.BaseFeeChangeDenominator()))
baseFeeDelta := math.BigMax(num, common.Big1)

return num.Add(parent.BaseFee, baseFeeDelta)
Expand All @@ -85,7 +85,7 @@ func CalcBaseFee(config *params.ChainConfig, parent *types.Header) *big.Int {
num.SetUint64(parentGasTarget - parent.GasUsed)
num.Mul(num, parent.BaseFee)
num.Div(num, denom.SetUint64(parentGasTarget))
num.Div(num, denom.SetUint64(params.BaseFeeChangeDenominator))
num.Div(num, denom.SetUint64(config.BaseFeeChangeDenominator()))
baseFee := num.Sub(parent.BaseFee, num)

return math.BigMax(baseFee, common.Big0)
Expand Down
4 changes: 2 additions & 2 deletions core/chain_makers.go
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Expand Up @@ -174,7 +174,7 @@ func (b *BlockGen) AddUncle(h *types.Header) {
if b.config.IsLondon(h.Number) {
h.BaseFee = misc.CalcBaseFee(b.config, parent)
if !b.config.IsLondon(parent.Number) {
parentGasLimit := parent.GasLimit * params.ElasticityMultiplier
parentGasLimit := parent.GasLimit * b.config.ElasticityMultiplier()
h.GasLimit = CalcGasLimit(parentGasLimit, parentGasLimit)
}
}
Expand Down Expand Up @@ -322,7 +322,7 @@ func makeHeader(chain consensus.ChainReader, parent *types.Block, state *state.S
if chain.Config().IsLondon(header.Number) {
header.BaseFee = misc.CalcBaseFee(chain.Config(), parent.Header())
if !chain.Config().IsLondon(parent.Number()) {
parentGasLimit := parent.GasLimit() * params.ElasticityMultiplier
parentGasLimit := parent.GasLimit() * chain.Config().ElasticityMultiplier()
header.GasLimit = CalcGasLimit(parentGasLimit, parentGasLimit)
}
}
Expand Down
2 changes: 1 addition & 1 deletion miner/worker.go
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Expand Up @@ -1006,7 +1006,7 @@ func (w *worker) prepareWork(genParams *generateParams) (*environment, error) {
if w.chainConfig.IsLondon(header.Number) {
header.BaseFee = misc.CalcBaseFee(w.chainConfig, parent.Header())
if !w.chainConfig.IsLondon(parent.Number()) {
parentGasLimit := parent.GasLimit() * params.ElasticityMultiplier
parentGasLimit := parent.GasLimit() * w.chainConfig.ElasticityMultiplier()
header.GasLimit = core.CalcGasLimit(parentGasLimit, w.config.GasCeil)
}
}
Expand Down
39 changes: 35 additions & 4 deletions params/config.go
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Expand Up @@ -270,17 +270,17 @@ 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, false, nil, 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, false, nil, 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}
NonActivatedConfig = &ChainConfig{big.NewInt(1), nil, nil, false, nil, common.Hash{}, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, 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, false, nil, new(EthashConfig), nil}
NonActivatedConfig = &ChainConfig{big.NewInt(1), nil, nil, false, nil, common.Hash{}, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, false, nil, new(EthashConfig), nil}
TestRules = TestChainConfig.Rules(new(big.Int), false)
)

Expand Down Expand Up @@ -383,6 +383,9 @@ type ChainConfig struct {
// even without having seen the TTD locally (safer long term).
TerminalTotalDifficultyPassed bool `json:"terminalTotalDifficultyPassed,omitempty"`

// EIP-1559 parameters. Defaults to standard mainnet parameters if left unspecified.
EIP1559 *EIP1559Config `json:"eip1559,omitempty"`

// Various consensus engines
Ethash *EthashConfig `json:"ethash,omitempty"`
Clique *CliqueConfig `json:"clique,omitempty"`
Expand Down Expand Up @@ -709,6 +712,34 @@ func (c *ChainConfig) checkCompatible(newcfg *ChainConfig, head *big.Int) *Confi
return nil
}

// EIP1559Config makes the EIP-1559 parameters configurable.
// Chains with non-standard block time may adjust these to maintain a similar base fee adjustment rate
// and maximum gas limit, while maintaining a safe block gas target.
type EIP1559Config struct {
// BaseFeeChangeDenominator bounds the amount the base fee can change between blocks.
BaseFeeChangeDenominator uint64 `json:"baseFeeChangeDenominator"`
// ElasticityMultiplier bounds the maximum gas limit an EIP-1559 block may have.
ElasticityMultiplier uint64 `json:"elasticityMultiplier"`
}

// BaseFeeChangeDenominator bounds the amount the base fee can change between blocks.
// This defaults to DefaultBaseFeeChangeDenominator if the EIP-1559 parameters are unspecified.
func (c *ChainConfig) BaseFeeChangeDenominator() uint64 {
if c.EIP1559 != nil {
return c.EIP1559.BaseFeeChangeDenominator
}
return DefaultBaseFeeChangeDenominator
}

// ElasticityMultiplier bounds the maximum gas limit an EIP-1559 block may have.
// This defaults to DefaultElasticityMultiplier if the EIP-1559 parameters are unspecified.
func (c *ChainConfig) ElasticityMultiplier() uint64 {
if c.EIP1559 != nil {
return c.EIP1559.ElasticityMultiplier
}
return DefaultElasticityMultiplier
}

// isForkIncompatible returns true if a fork scheduled at s1 cannot be rescheduled to
// block s2 because head is already past the fork.
func isForkIncompatible(s1, s2, head *big.Int) bool {
Expand Down
6 changes: 3 additions & 3 deletions params/protocol_params.go
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Original file line number Diff line number Diff line change
Expand Up @@ -119,9 +119,9 @@ const (
// Introduced in Tangerine Whistle (Eip 150)
CreateBySelfdestructGas uint64 = 25000

BaseFeeChangeDenominator = 8 // Bounds the amount the base fee can change between blocks.
ElasticityMultiplier = 2 // Bounds the maximum gas limit an EIP-1559 block may have.
InitialBaseFee = 1000000000 // Initial base fee for EIP-1559 blocks.
DefaultBaseFeeChangeDenominator = 8 // Bounds the amount the base fee can change between blocks.
DefaultElasticityMultiplier = 2 // Bounds the maximum gas limit an EIP-1559 block may have.
InitialBaseFee = 1000000000 // Initial base fee for EIP-1559 blocks.

MaxCodeSize = 24576 // Maximum bytecode to permit for a contract

Expand Down