Allow setting eip 1559 fee params

consensus/misc/eip1559/eip1559.go

@@ -35,7 +35,7 @@ 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 * config.ElasticityMultiplier()
+		parentGasLimit = parent.GasLimit * config.ElasticityMultiplier(parent.Number.Uint64())
 	}
 	if err := misc.VerifyGaslimit(parentGasLimit, header.GasLimit); err != nil {
 		return err
@@ -60,7 +60,7 @@ func CalcBaseFee(config *params.ChainConfig, parent *types.Header) *big.Int {
 		return new(big.Int).SetUint64(params.InitialBaseFee)
 	}
 
-	parentGasTarget := parent.GasLimit / config.ElasticityMultiplier()
+	parentGasTarget := parent.GasLimit / config.ElasticityMultiplier(parent.Number.Uint64()+1)
 	// 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)
@@ -77,7 +77,7 @@ 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(config.BaseFeeChangeDenominator()))
+		num.Div(num, denom.SetUint64(config.BaseFeeChangeDenominator(parent.Number.Uint64()+1)))
 		baseFeeDelta := math.BigMax(num, common.Big1)
 
 		return num.Add(parent.BaseFee, baseFeeDelta)
@@ -87,9 +87,14 @@ 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(config.BaseFeeChangeDenominator()))
+		num.Div(num, denom.SetUint64(config.BaseFeeChangeDenominator(parent.Number.Uint64()+1)))
 		baseFee := num.Sub(parent.BaseFee, num)
 
-		return math.BigMax(baseFee, common.Big0)
+		lowerBound := common.Big0
+		if config.AstriaEIP1559Params != nil {
+			lowerBound = config.AstriaEIP1559Params.MinBaseFeeAt(parent.Number.Uint64() + 1)
+		}
+
+		return math.BigMax(baseFee, lowerBound)
 	}
 }

core/chain_makers.go

@@ -231,7 +231,7 @@ func (b *BlockGen) AddUncle(h *types.Header) {
 	if b.cm.config.IsLondon(h.Number) {
 		h.BaseFee = eip1559.CalcBaseFee(b.cm.config, parent)
 		if !b.cm.config.IsLondon(parent.Number) {
-			parentGasLimit := parent.GasLimit * b.cm.config.ElasticityMultiplier()
+			parentGasLimit := parent.GasLimit * b.cm.config.ElasticityMultiplier(parent.Number.Uint64())
 			h.GasLimit = CalcGasLimit(parentGasLimit, parentGasLimit)
 		}
 	}
@@ -431,7 +431,7 @@ func (cm *chainMaker) makeHeader(parent *types.Block, state *state.StateDB, engi
 	if cm.config.IsLondon(header.Number) {
 		header.BaseFee = eip1559.CalcBaseFee(cm.config, parent.Header())
 		if !cm.config.IsLondon(parent.Number()) {
-			parentGasLimit := parent.GasLimit() * cm.config.ElasticityMultiplier()
+			parentGasLimit := parent.GasLimit() * cm.config.ElasticityMultiplier(parent.Number().Uint64())
 			header.GasLimit = CalcGasLimit(parentGasLimit, parentGasLimit)
 		}
 	}

genesis.json

@@ -21,7 +21,10 @@
         "astriaCelestiaInitialHeight": 2,
         "astriaCelestiaHeightVariance": 10,
         "astriaBridgeAddresses": [],
-        "astriaBridgeAllowedAssetDenom": "nria"
+        "astriaBridgeAllowedAssetDenom": "nria",
+        "astriaEIP1559Params": {
+            "1": { "minBaseFee": 0, "elasticityMultiplier": 2, "BaseFeeChangeDenominator": 8 }
+        }
     },
     "difficulty": "10000000",
     "gasLimit": "8000000",

miner/worker.go

@@ -1025,7 +1025,7 @@ func (w *worker) prepareWork(genParams *generateParams) (*environment, error) {
 	if w.chainConfig.IsLondon(header.Number) {
 		header.BaseFee = eip1559.CalcBaseFee(w.chainConfig, parent)
 		if !w.chainConfig.IsLondon(parent.Number) {
-			parentGasLimit := parent.GasLimit * w.chainConfig.ElasticityMultiplier()
+			parentGasLimit := parent.GasLimit * w.chainConfig.ElasticityMultiplier(parent.Number.Uint64())
 			header.GasLimit = core.CalcGasLimit(parentGasLimit, w.config.GasCeil)
 		}
 	}

params/config.go

@@ -17,8 +17,10 @@
 package params
 
 import (
+	"encoding/json"
 	"fmt"
 	"math/big"
+	"sort"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
@@ -337,14 +339,15 @@ type ChainConfig struct {
 	IsDevMode bool          `json:"isDev,omitempty"`
 
 	// Astria Specific Configuration
-	AstriaOverrideGenesisExtraData bool            `json:"astriaOverrideGenesisExtraData,omitempty"`
-	AstriaExtraDataOverride        hexutil.Bytes   `json:"astriaExtraDataOverride,omitempty"`
-	AstriaRollupName               string          `json:"astriaRollupName,omitempty"`
-	AstriaSequencerInitialHeight   uint32          `json:"astriaSequencerInitialHeight"`
-	AstriaCelestiaInitialHeight    uint32          `json:"astriaCelestiaInitialHeight"`
-	AstriaCelestiaHeightVariance   uint32          `json:"astriaCelestiaHeightVariance,omitempty"`
-	AstriaBridgeAddresses          []hexutil.Bytes `json:"astriaBridgeAddresses,omitempty"`
-	AstriaBridgeAllowedAssetDenom  string          `json:"astriaBridgeAllowedAssetDenom,omitempty"`
+	AstriaOverrideGenesisExtraData bool                 `json:"astriaOverrideGenesisExtraData,omitempty"`
+	AstriaExtraDataOverride        hexutil.Bytes        `json:"astriaExtraDataOverride,omitempty"`
+	AstriaRollupName               string               `json:"astriaRollupName,omitempty"`
+	AstriaSequencerInitialHeight   uint32               `json:"astriaSequencerInitialHeight"`
+	AstriaCelestiaInitialHeight    uint32               `json:"astriaCelestiaInitialHeight"`
+	AstriaCelestiaHeightVariance   uint32               `json:"astriaCelestiaHeightVariance,omitempty"`
+	AstriaBridgeAddresses          []hexutil.Bytes      `json:"astriaBridgeAddresses,omitempty"`
+	AstriaBridgeAllowedAssetDenom  string               `json:"astriaBridgeAllowedAssetDenom,omitempty"`
+	AstriaEIP1559Params            *AstriaEIP1559Params `json:"astriaEIP1559Params,omitempty"`
 }
 
 func (c *ChainConfig) AstriaExtraData() []byte {
@@ -368,6 +371,72 @@ func (c *ChainConfig) AstriaExtraData() []byte {
 	return extra
 }
 
+type AstriaEIP1559Param struct {
+	MinBaseFee               uint64 `json:"minBaseFee"`
+	ElasticityMultiplier     uint64 `json:"elasticityMultiplier"`
+	BaseFeeChangeDenominator uint64 `json:"baseFeeChangeDenominator"`
+}
+
+type AstriaEIP1559Params struct {
+	heights        map[uint64]AstriaEIP1559Param
+	orderedHeights []uint64
+}
+
+func (c *AstriaEIP1559Params) MinBaseFeeAt(height uint64) *big.Int {
+	c.init()
+	for _, h := range c.orderedHeights {
+		if height >= h {
+			return big.NewInt(0).SetUint64(c.heights[h].MinBaseFee)
+		}
+	}
+	return common.Big0
+}
+
+func (c *AstriaEIP1559Params) ElasticityMultiplierAt(height uint64) uint64 {
+	c.init()
+	for _, h := range c.orderedHeights {
+		if height >= h {
+			return c.heights[h].ElasticityMultiplier
+		}
+	}
+	return DefaultElasticityMultiplier
+}
+
+func (c *AstriaEIP1559Params) BaseFeeChangeDenominatorAt(height uint64) uint64 {
+	c.init()
+	for _, h := range c.orderedHeights {
+		if height >= h {
+			return c.heights[h].BaseFeeChangeDenominator
+		}
+	}
+	return DefaultBaseFeeChangeDenominator
+}
+
+func (c *AstriaEIP1559Params) init() {
+	if len(c.orderedHeights) > 0 || len(c.heights) < 1 {
+		return
+	}
+
+	c.orderedHeights = []uint64{}
+	for k, _ := range c.heights {
+		c.orderedHeights = append(c.orderedHeights, k)
+	}
+
+	sort.Slice(c.orderedHeights, func(i, j int) bool { return c.orderedHeights[i] > c.orderedHeights[j] })
+}
+
+func (c AstriaEIP1559Params) MarshalJSON() ([]byte, error) {
+	return json.Marshal(c.heights)
+}
+
+func (c *AstriaEIP1559Params) UnmarshalJSON(data []byte) error {
+	if err := json.Unmarshal(data, &c.heights); err != nil {
+		return err
+	}
+	c.init()
+	return nil
+}
+
 // EthashConfig is the consensus engine configs for proof-of-work based sealing.
 type EthashConfig struct{}
 
@@ -744,12 +813,18 @@ func (c *ChainConfig) checkCompatible(newcfg *ChainConfig, headNumber *big.Int,
 }
 
 // BaseFeeChangeDenominator bounds the amount the base fee can change between blocks.
-func (c *ChainConfig) BaseFeeChangeDenominator() uint64 {
+func (c *ChainConfig) BaseFeeChangeDenominator(height uint64) uint64 {
+	if c.AstriaEIP1559Params != nil {
+		return c.AstriaEIP1559Params.BaseFeeChangeDenominatorAt(height)
+	}
 	return DefaultBaseFeeChangeDenominator
 }
 
 // ElasticityMultiplier bounds the maximum gas limit an EIP-1559 block may have.
-func (c *ChainConfig) ElasticityMultiplier() uint64 {
+func (c *ChainConfig) ElasticityMultiplier(height uint64) uint64 {
+	if c.AstriaEIP1559Params != nil {
+		return c.AstriaEIP1559Params.ElasticityMultiplierAt(height)
+	}
 	return DefaultElasticityMultiplier
 }