all: rework genesis api (#567)

* core: store genesis allocation and recommit them if necessary (#24460)

* core: store genesis allocation and recommit them if necessary

* core: recover predefined genesis allocation if possible

* all: cleanup the APIs for initializing genesis (#25473)

* all: polish tests

* core: apply feedback from Guillaume

* core: fix comment

---------

Co-authored-by: rjl493456442 <[email protected]>

cmd/devp2p/internal/ethtest/chain.go

@@ -133,7 +133,7 @@ func loadChain(chainfile string, genesis string) (*Chain, error) {
 	if err != nil {
 		return nil, err
 	}
-	gblock := gen.ToBlock(nil)
+	gblock := gen.ToBlock()
 
 	blocks, err := blocksFromFile(chainfile, gblock)
 	if err != nil {

cmd/evm/runner.go

@@ -138,7 +138,7 @@ func runCmd(ctx *cli.Context) error {
 		gen := readGenesis(ctx.String(GenesisFlag.Name))
 		genesisConfig = gen
 		db := rawdb.NewMemoryDatabase()
-		genesis := gen.ToBlock(db)
+		genesis := gen.MustCommit(db)
 		statedb, _ = state.New(genesis.Root(), state.NewDatabase(db), nil)
 		chainConfig = gen.Config
 	} else {

cmd/faucet/faucet.go

@@ -251,7 +251,7 @@ func newFaucet(genesis *core.Genesis, port int, enodes []*enode.Node, network ui
 	cfg.SyncMode = downloader.LightSync
 	cfg.NetworkId = network
 	cfg.Genesis = genesis
-	utils.SetDNSDiscoveryDefaults(&cfg, genesis.ToBlock(nil).Hash())
+	utils.SetDNSDiscoveryDefaults(&cfg, genesis.ToBlock().Hash())
 
 	lesBackend, err := les.New(stack, &cfg)
 	if err != nil {

consensus/clique/snapshot_test.go

@@ -403,7 +403,7 @@ func TestClique(t *testing.T) {
 		}
 		// Create a pristine blockchain with the genesis injected
 		db := rawdb.NewMemoryDatabase()
-		genesis.Commit(db)
+		genesisBlock := genesis.MustCommit(db)
 
 		// Assemble a chain of headers from the cast votes
 		config := *params.TestChainConfig
@@ -414,7 +414,7 @@ func TestClique(t *testing.T) {
 		engine := New(config.Clique, db)
 		engine.fakeDiff = true
 
-		blocks, _ := core.GenerateChain(&config, genesis.ToBlock(db), engine, db, len(tt.votes), func(j int, gen *core.BlockGen) {
+		blocks, _ := core.GenerateChain(&config, genesisBlock, engine, db, len(tt.votes), func(j int, gen *core.BlockGen) {
 			// Cast the vote contained in this block
 			gen.SetCoinbase(accounts.address(tt.votes[j].voted))
 			if tt.votes[j].auth {

core/blockchain.go

@@ -691,6 +691,19 @@ func (bc *BlockChain) setHeadBeyondRoot(head uint64, root common.Hash, repair bo
 						}
 					}
 					if beyondRoot || newHeadBlock.NumberU64() == 0 {
+						if newHeadBlock.NumberU64() == 0 {
+							// Recommit the genesis state into disk in case the rewinding destination
+							// is genesis block and the relevant state is gone. In the future this
+							// rewinding destination can be the earliest block stored in the chain
+							// if the historical chain pruning is enabled. In that case the logic
+							// needs to be improved here.
+							if !bc.HasState(bc.genesisBlock.Root()) {
+								if err := CommitGenesisState(bc.db, bc.genesisBlock.Hash()); err != nil {
+									log.Crit("Failed to commit genesis state", "err", err)
+								}
+								log.Debug("Recommitted genesis state to disk")
+							}
+						}
 						log.Debug("Rewound to block with state", "number", newHeadBlock.NumberU64(), "hash", newHeadBlock.Hash())
 						break
 					}

core/chain_makers.go

@@ -371,7 +371,7 @@ func GenerateChainWithGenesis(genesis *Genesis, engine consensus.Engine, n int,
 	if err != nil {
 		panic(err)
 	}
-	blocks, receipts := GenerateChain(genesis.Config, genesis.ToBlock(db), engine, db, n, gen, true)
+	blocks, receipts := GenerateChain(genesis.Config, genesis.ToBlock(), engine, db, n, gen, true)
 	return db, blocks, receipts
 }
 

core/genesis.go

@@ -80,6 +80,96 @@ func (ga *GenesisAlloc) UnmarshalJSON(data []byte) error {
 	return nil
 }
 
+// deriveHash computes the state root according to the genesis specification.
+func (ga *GenesisAlloc) deriveHash() (common.Hash, error) {
+	// Create an ephemeral in-memory database for computing hash,
+	// all the derived states will be discarded to not pollute disk.
+	db := state.NewDatabase(rawdb.NewMemoryDatabase())
+	statedb, err := state.New(common.Hash{}, db, nil)
+	if err != nil {
+		return common.Hash{}, err
+	}
+	for addr, account := range *ga {
+		statedb.AddBalance(addr, account.Balance)
+		statedb.SetCode(addr, account.Code)
+		statedb.SetNonce(addr, account.Nonce)
+		for key, value := range account.Storage {
+			statedb.SetState(addr, key, value)
+		}
+	}
+	return statedb.Commit(false)
+}
+
+// flush is very similar with deriveHash, but the main difference is
+// all the generated states will be persisted into the given database.
+// Also, the genesis state specification will be flushed as well.
+func (ga *GenesisAlloc) flush(db ethdb.Database) error {
+	statedb, err := state.New(common.Hash{}, state.NewDatabase(db), nil)
+	if err != nil {
+		return err
+	}
+	for addr, account := range *ga {
+		statedb.AddBalance(addr, account.Balance)
+		statedb.SetCode(addr, account.Code)
+		statedb.SetNonce(addr, account.Nonce)
+		for key, value := range account.Storage {
+			statedb.SetState(addr, key, value)
+		}
+	}
+	root, err := statedb.Commit(false)
+	if err != nil {
+		return err
+	}
+	err = statedb.Database().TrieDB().Commit(root, true, nil)
+	if err != nil {
+		return err
+	}
+	// Marshal the genesis state specification and persist.
+	blob, err := json.Marshal(ga)
+	if err != nil {
+		return err
+	}
+	rawdb.WriteGenesisStateSpec(db, root, blob)
+	return nil
+}
+
+// CommitGenesisState loads the stored genesis state with the given block
+// hash and commits them into the given database handler.
+func CommitGenesisState(db ethdb.Database, hash common.Hash) error {
+	var alloc GenesisAlloc
+	blob := rawdb.ReadGenesisStateSpec(db, hash)
+	if len(blob) != 0 {
+		if err := alloc.UnmarshalJSON(blob); err != nil {
+			return err
+		}
+	} else {
+		// Genesis allocation is missing and there are several possibilities:
+		// the node is legacy which doesn't persist the genesis allocation or
+		// the persisted allocation is just lost.
+		// - supported networks(mainnet, testnets), recover with defined allocations
+		// - private network, can't recover
+		var genesis *Genesis
+		switch hash {
+		case params.MainnetGenesisHash:
+			genesis = DefaultGenesisBlock()
+		case params.RopstenGenesisHash:
+			genesis = DefaultRopstenGenesisBlock()
+		case params.RinkebyGenesisHash:
+			genesis = DefaultRinkebyGenesisBlock()
+		case params.GoerliGenesisHash:
+			genesis = DefaultGoerliGenesisBlock()
+		case params.SepoliaGenesisHash:
+			genesis = DefaultSepoliaGenesisBlock()
+		}
+		if genesis != nil {
+			alloc = genesis.Alloc
+		} else {
+			return errors.New("not found")
+		}
+	}
+	return alloc.flush(db)
+}
+
 // GenesisAccount is an account in the state of the genesis block.
 type GenesisAccount struct {
 	Code       []byte                      `json:"code,omitempty"`
@@ -185,7 +275,7 @@ func SetupGenesisBlockWithOverride(db ethdb.Database, genesis *Genesis, override
 			genesis = DefaultGenesisBlock()
 		}
 		// Ensure the stored genesis matches with the given one.
-		hash := genesis.ToBlock(nil).Hash()
+		hash := genesis.ToBlock().Hash()
 		if hash != stored {
 			return genesis.Config, hash, &GenesisMismatchError{stored, hash}
 		}
@@ -197,7 +287,7 @@ func SetupGenesisBlockWithOverride(db ethdb.Database, genesis *Genesis, override
 	}
 	// Check whether the genesis block is already written.
 	if genesis != nil {
-		hash := genesis.ToBlock(nil).Hash()
+		hash := genesis.ToBlock().Hash()
 		if hash != stored {
 			return genesis.Config, hash, &GenesisMismatchError{stored, hash}
 		}
@@ -262,25 +352,12 @@ func (g *Genesis) configOrDefault(ghash common.Hash) *params.ChainConfig {
 	}
 }
 
-// ToBlock creates the genesis block and writes state of a genesis specification
-// to the given database (or discards it if nil).
-func (g *Genesis) ToBlock(db ethdb.Database) *types.Block {
-	if db == nil {
-		db = rawdb.NewMemoryDatabase()
-	}
-	statedb, err := state.New(common.Hash{}, state.NewDatabase(db), nil)
+// ToBlock returns the genesis block according to genesis specification.
+func (g *Genesis) ToBlock() *types.Block {
+	root, err := g.Alloc.deriveHash()
 	if err != nil {
 		panic(err)
 	}
-	for addr, account := range g.Alloc {
-		statedb.AddBalance(addr, account.Balance)
-		statedb.SetCode(addr, account.Code)
-		statedb.SetNonce(addr, account.Nonce)
-		for key, value := range account.Storage {
-			statedb.SetState(addr, key, value)
-		}
-	}
-	root := statedb.IntermediateRoot(false)
 	head := &types.Header{
 		Number:     new(big.Int).SetUint64(g.Number),
 		Nonce:      types.EncodeNonce(g.Nonce),
@@ -308,16 +385,13 @@ func (g *Genesis) ToBlock(db ethdb.Database) *types.Block {
 			head.BaseFee = new(big.Int).SetUint64(params.InitialBaseFee)
 		}
 	}
-	statedb.Commit(false)
-	statedb.Database().TrieDB().Commit(root, true, nil)
-
 	return types.NewBlock(head, nil, nil, nil, trie.NewStackTrie(nil))
 }
 
 // Commit writes the block and state of a genesis specification to the database.
 // The block is committed as the canonical head block.
 func (g *Genesis) Commit(db ethdb.Database) (*types.Block, error) {
-	block := g.ToBlock(db)
+	block := g.ToBlock()
 	if block.Number().Sign() != 0 {
 		return nil, errors.New("can't commit genesis block with number > 0")
 	}
@@ -331,6 +405,12 @@ func (g *Genesis) Commit(db ethdb.Database) (*types.Block, error) {
 	if config.Clique != nil && len(block.Extra()) == 0 {
 		return nil, errors.New("can't start clique chain without signers")
 	}
+	// All the checks has passed, flush the states derived from the genesis
+	// specification as well as the specification itself into the provided
+	// database.
+	if err := g.Alloc.flush(db); err != nil {
+		return nil, err
+	}
 	rawdb.WriteTd(db, block.Hash(), block.NumberU64(), block.Difficulty())
 	rawdb.WriteBlock(db, block)
 	rawdb.WriteReceipts(db, block.Hash(), block.NumberU64(), nil)
@@ -352,15 +432,6 @@ func (g *Genesis) MustCommit(db ethdb.Database) *types.Block {
 	return block
 }
 
-// GenesisBlockForTesting creates and writes a block in which addr has the given wei balance.
-func GenesisBlockForTesting(db ethdb.Database, addr common.Address, balance *big.Int) *types.Block {
-	g := Genesis{
-		Alloc:   GenesisAlloc{addr: {Balance: balance}},
-		BaseFee: big.NewInt(params.InitialBaseFee),
-	}
-	return g.MustCommit(db)
-}
-
 // DefaultGenesisBlock returns the Ethereum main net genesis block.
 func DefaultGenesisBlock() *Genesis {
 	return &Genesis{

core/genesis_test.go

@@ -178,7 +178,7 @@ func TestGenesisHashes(t *testing.T) {
 			t.Errorf("case: %d a), want: %s, got: %s", i, c.want.Hex(), have.Hex())
 		}
 		// Test via ToBlock
-		if have := c.genesis.ToBlock(nil).Hash(); have != c.want {
+		if have := c.genesis.ToBlock().Hash(); have != c.want {
 			t.Errorf("case: %d a), want: %s, got: %s", i, c.want.Hex(), have.Hex())
 		}
 	}
@@ -192,11 +192,7 @@ func TestGenesis_Commit(t *testing.T) {
 	}
 
 	db := rawdb.NewMemoryDatabase()
-	genesisBlock, err := genesis.Commit(db)
-	if err != nil {
-		t.Fatal(err)
-	}
-
+	genesisBlock := genesis.MustCommit(db)
 	if genesis.Difficulty != nil {
 		t.Fatalf("assumption wrong")
 	}
@@ -213,3 +209,33 @@ func TestGenesis_Commit(t *testing.T) {
 		t.Errorf("inequal difficulty; stored: %v, genesisBlock: %v", stored, genesisBlock.Difficulty())
 	}
 }
+
+func TestReadWriteGenesisAlloc(t *testing.T) {
+	var (
+		db    = rawdb.NewMemoryDatabase()
+		alloc = &GenesisAlloc{
+			{1}: {Balance: big.NewInt(1), Storage: map[common.Hash]common.Hash{{1}: {1}}},
+			{2}: {Balance: big.NewInt(2), Storage: map[common.Hash]common.Hash{{2}: {2}}},
+		}
+		hash, _ = alloc.deriveHash()
+	)
+	alloc.flush(db)
+
+	var reload GenesisAlloc
+	err := reload.UnmarshalJSON(rawdb.ReadGenesisStateSpec(db, hash))
+	if err != nil {
+		t.Fatalf("Failed to load genesis state %v", err)
+	}
+	if len(reload) != len(*alloc) {
+		t.Fatal("Unexpected genesis allocation")
+	}
+	for addr, account := range reload {
+		want, ok := (*alloc)[addr]
+		if !ok {
+			t.Fatal("Account is not found")
+		}
+		if !reflect.DeepEqual(want, account) {
+			t.Fatal("Unexpected account")
+		}
+	}
+}

core/rawdb/accessors_metadata.go

@@ -81,6 +81,20 @@ func WriteChainConfig(db ethdb.KeyValueWriter, hash common.Hash, cfg *params.Cha
 	}
 }
 
+// ReadGenesisStateSpec retrieves the genesis state specification based on the
+// given genesis hash.
+func ReadGenesisStateSpec(db ethdb.KeyValueReader, hash common.Hash) []byte {
+	data, _ := db.Get(genesisStateSpecKey(hash))
+	return data
+}
+
+// WriteGenesisStateSpec writes the genesis state specification into the disk.
+func WriteGenesisStateSpec(db ethdb.KeyValueWriter, hash common.Hash, data []byte) {
+	if err := db.Put(genesisStateSpecKey(hash), data); err != nil {
+		log.Crit("Failed to store genesis state", "err", err)
+	}
+}
+
 // crashList is a list of unclean-shutdown-markers, for rlp-encoding to the
 // database
 type crashList struct {

core/rawdb/database.go

@@ -460,6 +460,8 @@ func InspectDatabase(db ethdb.Database, keyPrefix, keyStart []byte) error {
 			preimages.Add(size)
 		case bytes.HasPrefix(key, configPrefix) && len(key) == (len(configPrefix)+common.HashLength):
 			metadata.Add(size)
+		case bytes.HasPrefix(key, genesisPrefix) && len(key) == (len(genesisPrefix)+common.HashLength):
+			metadata.Add(size)
 		case bytes.HasPrefix(key, bloomBitsPrefix) && len(key) == (len(bloomBitsPrefix)+10+common.HashLength):
 			bloomBits.Add(size)
 		case bytes.HasPrefix(key, BloomBitsIndexPrefix):

core/rawdb/schema.go

@@ -103,8 +103,9 @@ var (
 	internalTxsPrefix = []byte("itxs") // internalTxsPrefix + block hash -> internal transactions
 	dirtyAccountsKey  = []byte("dacc") // dirtyAccountsPrefix + block hash -> dirty accounts
 
-	PreimagePrefix = []byte("secure-key-")      // PreimagePrefix + hash -> preimage
-	configPrefix   = []byte("ethereum-config-") // config prefix for the db
+	PreimagePrefix = []byte("secure-key-")       // PreimagePrefix + hash -> preimage
+	configPrefix   = []byte("ethereum-config-")  // config prefix for the db
+	genesisPrefix  = []byte("ethereum-genesis-") // genesis state prefix for the db
 
 	// Chain index prefixes (use `i` + single byte to avoid mixing data types).
 	BloomBitsIndexPrefix = []byte("iB") // BloomBitsIndexPrefix is the data table of a chain indexer to track its progress
@@ -254,6 +255,11 @@ func configKey(hash common.Hash) []byte {
 	return append(configPrefix, hash.Bytes()...)
 }
 
+// genesisStateSpecKey = genesisPrefix + hash
+func genesisStateSpecKey(hash common.Hash) []byte {
+	return append(genesisPrefix, hash.Bytes()...)
+}
+
 func snapshotConsortiumKey(hash common.Hash) []byte {
 	return append(snapshotConsortiumPrefix, hash.Bytes()...)
 }

eth/catalyst/api_test.go

@@ -55,8 +55,9 @@ func generateTestChain() (*core.Genesis, []*types.Block) {
 		g.OffsetTime(5)
 		g.SetExtra([]byte("test"))
 	}
-	gblock := genesis.ToBlock(db)
+	gblock := genesis.ToBlock()
 	engine := ethash.NewFaker()
+	genesis.MustCommit(db)
 	blocks, _ := core.GenerateChain(config, gblock, engine, db, 10, generate, true)
 	blocks = append([]*types.Block{gblock}, blocks...)
 	return genesis, blocks
@@ -100,7 +101,7 @@ func generateTestChainWithFork(n int, fork int) (*core.Genesis, []*types.Block,
 		g.OffsetTime(5)
 		g.SetExtra([]byte("testF"))
 	}
-	gblock := genesis.ToBlock(db)
+	gblock := genesis.MustCommit(db)
 	engine := ethash.NewFaker()
 	blocks, _ := core.GenerateChain(config, gblock, engine, db, n, generate)
 	blocks = append([]*types.Block{gblock}, blocks...)