EVM-607 Hard-forking PoC

blockchain/blockchain.go

@@ -1413,7 +1413,7 @@ func (b *Blockchain) Close() error {
 
 // CalculateBaseFee calculates the basefee of the header.
 func (b *Blockchain) CalculateBaseFee(parent *types.Header) uint64 {
-	if !b.config.Params.Forks.IsLondon(parent.Number) {
+	if !b.config.Params.Forks.IsActive(chain.London, parent.Number) {
 		return chain.GenesisBaseFee
 	}
 

blockchain/blockchain_test.go

@@ -1365,12 +1365,11 @@ func TestBlockchain_CalculateBaseFee(t *testing.T) {
 		t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
 			t.Parallel()
 
-			fork := chain.Fork(5)
 			blockchain := Blockchain{
 				config: &chain.Chain{
 					Params: &chain.Params{
 						Forks: &chain.Forks{
-							London: &fork,
+							chain.London: chain.NewFork(5),
 						},
 					},
 					Genesis: &chain.Genesis{

blockchain/testing.go

@@ -97,13 +97,14 @@ func NewTestBlockchain(t *testing.T, headers []*types.Header) *Blockchain {
 		Number:   0,
 		GasLimit: 0,
 	}
+	forksAvail := &chain.Forks{
+		chain.EIP155:    chain.NewFork(0),
+		chain.Homestead: chain.NewFork(0),
+	}
 	config := &chain.Chain{
 		Genesis: genesis,
 		Params: &chain.Params{
-			Forks: &chain.Forks{
-				EIP155:    chain.NewFork(0),
-				Homestead: chain.NewFork(0),
-			},
+			Forks:          forksAvail,
 			BlockGasTarget: defaultBlockGasTarget,
 		},
 	}

chain/params.go

@@ -74,70 +74,43 @@ func (p *Params) GetEngine() string {
 	return ""
 }
 
-// Forks specifies when each fork is activated
-type Forks struct {
-	Homestead      *Fork `json:"homestead,omitempty"`
-	Byzantium      *Fork `json:"byzantium,omitempty"`
-	Constantinople *Fork `json:"constantinople,omitempty"`
-	Petersburg     *Fork `json:"petersburg,omitempty"`
-	Istanbul       *Fork `json:"istanbul,omitempty"`
-	London         *Fork `json:"london,omitempty"`
-	EIP150         *Fork `json:"EIP150,omitempty"`
-	EIP158         *Fork `json:"EIP158,omitempty"`
-	EIP155         *Fork `json:"EIP155,omitempty"`
-}
-
-func (f *Forks) active(ff *Fork, block uint64) bool {
-	if ff == nil {
-		return false
-	}
-
-	return ff.Active(block)
-}
-
-func (f *Forks) IsHomestead(block uint64) bool {
-	return f.active(f.Homestead, block)
-}
-
-func (f *Forks) IsByzantium(block uint64) bool {
-	return f.active(f.Byzantium, block)
-}
-
-func (f *Forks) IsConstantinople(block uint64) bool {
-	return f.active(f.Constantinople, block)
-}
+// predefined forks
+const (
+	Homestead      = "homestead"
+	Byzantium      = "byzantium"
+	Constantinople = "constantinople"
+	Petersburg     = "petersburg"
+	Istanbul       = "istanbul"
+	London         = "london"
+	EIP150         = "EIP150"
+	EIP158         = "EIP158"
+	EIP155         = "EIP155"
+)
 
-func (f *Forks) IsPetersburg(block uint64) bool {
-	return f.active(f.Petersburg, block)
-}
+// Forks is map which contains all forks and their starting blocks from genesis
+type Forks map[string]*Fork
 
-func (f *Forks) IsLondon(block uint64) bool {
-	return f.active(f.London, block)
-}
+func (f *Forks) IsActive(name string, block uint64) bool {
+	ff := (*f)[name]
 
-func (f *Forks) IsEIP150(block uint64) bool {
-	return f.active(f.EIP150, block)
+	return ff != nil && ff.Active(block)
 }
 
-func (f *Forks) IsEIP158(block uint64) bool {
-	return f.active(f.EIP158, block)
-}
-
-func (f *Forks) IsEIP155(block uint64) bool {
-	return f.active(f.EIP155, block)
+func (f *Forks) SetFork(name string, value *Fork) {
+	(*f)[name] = value
 }
 
 func (f *Forks) At(block uint64) ForksInTime {
 	return ForksInTime{
-		Homestead:      f.active(f.Homestead, block),
-		Byzantium:      f.active(f.Byzantium, block),
-		Constantinople: f.active(f.Constantinople, block),
-		Petersburg:     f.active(f.Petersburg, block),
-		Istanbul:       f.active(f.Istanbul, block),
-		London:         f.active(f.London, block),
-		EIP150:         f.active(f.EIP150, block),
-		EIP158:         f.active(f.EIP158, block),
-		EIP155:         f.active(f.EIP155, block),
+		Homestead:      f.IsActive(Homestead, block),
+		Byzantium:      f.IsActive(Byzantium, block),
+		Constantinople: f.IsActive(Constantinople, block),
+		Petersburg:     f.IsActive(Petersburg, block),
+		Istanbul:       f.IsActive(Istanbul, block),
+		London:         f.IsActive(London, block),
+		EIP150:         f.IsActive(EIP150, block),
+		EIP158:         f.IsActive(EIP158, block),
+		EIP155:         f.IsActive(EIP155, block),
 	}
 }
 
@@ -157,6 +130,7 @@ func (f Fork) Int() *big.Int {
 	return big.NewInt(int64(f))
 }
 
+// ForksInTime should contain all supported forks by current edge version
 type ForksInTime struct {
 	Homestead,
 	Byzantium,
@@ -169,6 +143,8 @@ type ForksInTime struct {
 	EIP155 bool
 }
 
+// AllForksEnabled should contain all supported forks by current edge version
+// All forks should be available from block 0
 var AllForksEnabled = &Forks{
 	Homestead:      NewFork(0),
 	EIP150:         NewFork(0),
@@ -180,3 +156,10 @@ var AllForksEnabled = &Forks{
 	Istanbul:       NewFork(0),
 	London:         NewFork(0),
 }
+
+// IsForkAvailable returns true if some fork defined by its name is supported by current edge version
+func IsForkAvailable(name string) bool {
+	_, found := (*AllForksEnabled)[name]
+
+	return found
+}

command/genesis/params.go

@@ -370,7 +370,7 @@ func (p *genesisParams) initGenesisConfig() error {
 	// Disable london hardfork if burn contract address is not provided
 	enabledForks := chain.AllForksEnabled
 	if len(p.burnContracts) == 0 {
-		enabledForks.London = nil
+		enabledForks.SetFork(chain.London, nil)
 	}
 
 	chainConfig := &chain.Chain{

command/genesis/polybft_params.go

@@ -149,7 +149,7 @@ func (p *genesisParams) generatePolyBftChainConfig(o command.OutputFormatter) er
 	// Disable london hardfork if burn contract address is not provided
 	enabledForks := chain.AllForksEnabled
 	if len(p.burnContracts) == 0 {
-		enabledForks.London = nil
+		enabledForks.SetFork(chain.London, nil)
 	}
 
 	chainConfig := &chain.Chain{

consensus/polybft/polybft.go

@@ -16,6 +16,7 @@ import (
 	"github.com/0xPolygon/polygon-edge/consensus/polybft/validator"
 	"github.com/0xPolygon/polygon-edge/consensus/polybft/wallet"
 	"github.com/0xPolygon/polygon-edge/contracts"
+	"github.com/0xPolygon/polygon-edge/forkmanager"
 	"github.com/0xPolygon/polygon-edge/helper/common"
 	"github.com/0xPolygon/polygon-edge/helper/progress"
 	"github.com/0xPolygon/polygon-edge/network"
@@ -361,6 +362,26 @@ func GenesisPostHookFactory(config *chain.Chain, engineName string) func(txn *st
 	}
 }
 
+func ForkManagerFactory(forks *chain.Forks) error {
+	fm := forkmanager.GetInstance()
+
+	for name, block := range *forks {
+		if !chain.IsForkAvailable(name) {
+			return fmt.Errorf("fork is not available: %s", name)
+		}
+
+		fm.RegisterFork(forkmanager.ForkName(name))
+
+		if block != nil {
+			if err := fm.ActivateFork(forkmanager.ForkName(name), (uint64)(*block)); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
 // Initialize initializes the consensus (e.g. setup data)
 func (p *Polybft) Initialize() error {
 	p.logger.Info("initializing polybft...")

forkmanager/fork.go

@@ -0,0 +1,17 @@
+package forkmanager
+
+type ForkHandlerName string
+
+type ForkName string
+
+type Fork struct {
+	Name            ForkName
+	FromBlockNumber uint64
+	IsActive        bool
+	Handlers        map[ForkHandlerName]interface{}
+}
+
+type ForkActiveHandler struct {
+	FromBlockNumber uint64
+	Handler         interface{}
+}