Add IsArbitrum special case to NewBlockChain

Author: Tristan-Wilson

accounts/abi/bind/backends/simulated.go

@@ -83,7 +83,7 @@ func NewSimulatedBackendWithDatabase(database ethdb.Database, alloc core.Genesis
 		GasLimit: gasLimit,
 		Alloc:    alloc,
 	}
-	blockchain, _ := core.NewBlockChain(database, nil, &genesis, nil, ethash.NewFaker(), vm.Config{}, nil, nil)
+	blockchain, _ := core.NewBlockChain(database, nil, nil, &genesis, nil, ethash.NewFaker(), vm.Config{}, nil, nil)
 
 	backend := &SimulatedBackend{
 		database:   database,

core/blockchain.go

@@ -246,7 +246,7 @@ type trieGcEntry struct {
 // NewBlockChain returns a fully initialised block chain using information
 // available in the database. It initialises the default Ethereum Validator
 // and Processor.
-func NewBlockChain(db ethdb.Database, cacheConfig *CacheConfig, genesis *Genesis, overrides *ChainOverrides, engine consensus.Engine, vmConfig vm.Config, shouldPreserve func(header *types.Header) bool, txLookupLimit *uint64) (*BlockChain, error) {
+func NewBlockChain(db ethdb.Database, cacheConfig *CacheConfig, chainConfig *params.ChainConfig, genesis *Genesis, overrides *ChainOverrides, engine consensus.Engine, vmConfig vm.Config, shouldPreserve func(header *types.Header) bool, txLookupLimit *uint64) (*BlockChain, error) {
 	if cacheConfig == nil {
 		cacheConfig = defaultCacheConfig
 	}
@@ -257,12 +257,23 @@ func NewBlockChain(db ethdb.Database, cacheConfig *CacheConfig, genesis *Genesis
 		Journal:   cacheConfig.TrieCleanJournal,
 		Preimages: cacheConfig.Preimages,
 	})
-	// Setup the genesis block, commit the provided genesis specification
-	// to database if the genesis block is not present yet, or load the
-	// stored one from database.
-	chainConfig, genesisHash, genesisErr := SetupGenesisBlockWithOverride(db, triedb, genesis, overrides)
-	if _, ok := genesisErr.(*params.ConfigCompatError); genesisErr != nil && !ok {
-		return nil, genesisErr
+
+	var genesisHash common.Hash
+	var genesisErr error
+
+	if chainConfig.IsArbitrum() {
+		genesisHash = rawdb.ReadCanonicalHash(db, chainConfig.ArbitrumChainParams.GenesisBlockNum)
+		if (genesisHash == common.Hash{}) {
+			return nil, ErrNoGenesis
+		}
+	} else {
+		// Setup the genesis block, commit the provided genesis specification
+		// to database if the genesis block is not present yet, or load the
+		// stored one from database.
+		chainConfig, genesisHash, genesisErr = SetupGenesisBlockWithOverride(db, triedb, genesis, overrides)
+		if _, ok := genesisErr.(*params.ConfigCompatError); genesisErr != nil && !ok {
+			return nil, genesisErr
+		}
 	}
 	log.Info("")
 	log.Info(strings.Repeat("-", 153))

eth/backend.go

@@ -204,7 +204,7 @@ func New(stack *node.Node, config *ethconfig.Config) (*Ethereum, error) {
 	if config.OverrideShanghai != nil {
 		overrides.OverrideShanghai = config.OverrideShanghai
 	}
-	eth.blockchain, err = core.NewBlockChain(chainDb, cacheConfig, config.Genesis, &overrides, eth.engine, vmConfig, eth.shouldPreserve, &config.TxLookupLimit)
+	eth.blockchain, err = core.NewBlockChain(chainDb, cacheConfig, nil, config.Genesis, &overrides, eth.engine, vmConfig, eth.shouldPreserve, &config.TxLookupLimit)
 	if err != nil {
 		return nil, err
 	}