cmd/hivechain: add 4788 contract to genesis and set beacon root post-…

…cancun

Co-authored-by: Felix Lange <fjl@twurst.com>

cmd/hivechain/generate.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"math"
 	"math/big"
+	"math/rand"
 	"strings"
 
 	"github.com/ethereum/go-ethereum/accounts"
@@ -61,6 +62,7 @@ type generator struct {
 	genesis  *core.Genesis
 	td       *big.Int
 	accounts []genAccount
+	rand     *rand.Rand
 
 	modlist   []*modifierInstance
 	modOffset int
@@ -84,6 +86,7 @@ func newGenerator(cfg generatorConfig) *generator {
 	return &generator{
 		cfg:      cfg,
 		genesis:  genesis,
+		rand:     rand.New(rand.NewSource(10)),
 		td:       new(big.Int).Set(genesis.Difficulty),
 		modlist:  cfg.createBlockModifiers(),
 		accounts: slices.Clone(knownAccounts),
@@ -166,6 +169,7 @@ func (g *generator) modifyBlock(i int, gen *core.BlockGen) {
 		g.setClique(i, gen)
 	}
 	g.setDifficulty(i, gen)
+	g.setParentBeaconRoot(i, gen)
 	g.runModifiers(i, gen)
 }
 
@@ -200,6 +204,14 @@ func (g *generator) setDifficulty(i int, gen *core.BlockGen) {
 	}
 }
 
+func (g *generator) setParentBeaconRoot(i int, gen *core.BlockGen) {
+	if g.genesis.Config.IsCancun(gen.Number(), gen.Timestamp()) {
+		var h common.Hash
+		g.rand.Read(h[:])
+		gen.SetParentBeaconRoot(h)
+	}
+}
+
 // runModifiers executes the chain modifiers.
 func (g *generator) runModifiers(i int, gen *core.BlockGen) {
 	if len(g.modlist) == 0 || g.cfg.txInterval == 0 || i%g.cfg.txInterval != 0 {

cmd/hivechain/genesis.go

@@ -6,6 +6,7 @@ import (
 	"math/big"
 	"strings"
 
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/params"
@@ -163,6 +164,10 @@ func (cfg *generatorConfig) createGenesis() *core.Genesis {
 	// dcc := hexutil.MustDecode("0x" + depositCode)
 	// g.Alloc[dca] = core.GenesisAccount{Code: dcc}
 
+	// Deploy beacon roots storage contract (EIP-4788).
+	asm4788 := common.FromHex("0x3373fffffffffffffffffffffffffffffffffffffffe14604d57602036146024575f5ffd5b5f35801560495762001fff810690815414603c575f5ffd5b62001fff01545f5260205ff35b5f5ffd5b62001fff42064281555f359062001fff015500")
+	g.Alloc[params.BeaconRootsStorageAddress] = core.GenesisAccount{Code: asm4788, Balance: big.NewInt(42)}
+
 	return &g
 }