Add external calls within consensus mechanism

cmd/geth/main.go

@@ -157,6 +157,9 @@ var (
 		utils.ValContractFlag,
 		utils.ValChainIdFlag,
 		utils.ValChangeEpochIdFlag,
+		utils.ExternalCallRoleFlag,
+		utils.ExternalCallRpcFlag,
+		utils.ExternalCallSupportChainId,
 		utils.VMEnableDebugFlag,
 		utils.NetworkIdFlag,
 		utils.EthStatsURLFlag,

cmd/utils/flags.go

@@ -198,6 +198,18 @@ var (
 		Name:  "validator.rpc",
 		Usage: "rpc for Validator to update validator set",
 	}
+	ExternalCallEnableBlockNumber = cli.StringFlag{
+		Name:  "externalcall.role",
+		Usage: "different role to support externalCall( \n role 0: disable external call \n role 1: node reuses client of consensus as external call client \n role 2: node without client of external call \n role 3: node with independent client of external call(callRpc is not empty))",
+	}
+	ExternalCallRpcFlag = cli.StringFlag{
+		Name:  "externalcall.callrpc",
+		Usage: "rpc to launch independent external call client",
+	}
+	ExternalCallSupportChainId = cli.Uint64Flag{
+		Name:  "externalcall.supportchainid",
+		Usage: "chainId of the target chain of the external call",
+	}
 	DeveloperFlag = cli.BoolFlag{
 		Name:  "dev",
 		Usage: "Ephemeral proof-of-authority network with a pre-funded developer account, mining enabled",
@@ -1495,6 +1507,21 @@ func setTendermint(ctx *cli.Context, cfg *ethconfig.Config) {
 	}
 }
 
+func setExternalCall(ctx *cli.Context, cfg *ethconfig.Config) {
+	if ctx.GlobalIsSet(ExternalCallEnableBlockNumber.Name) {
+		cfg.ExternalCallEnableBlockNumber.SetString(ctx.GlobalString(ExternalCallEnableBlockNumber.Name), 10)
+	}
+
+	if ctx.GlobalIsSet(ExternalCallRpcFlag.Name) {
+		cfg.ExternalCallRpc = ctx.GlobalString(ExternalCallRpcFlag.Name)
+	}
+
+	if ctx.GlobalIsSet(ExternalCallSupportChainId.Name) {
+		cfg.ExternalCallSupportChainId = ctx.GlobalUint64(ExternalCallSupportChainId.Name)
+	}
+
+}
+
 func setMiner(ctx *cli.Context, cfg *miner.Config) {
 	if ctx.GlobalIsSet(MinerNotifyFlag.Name) {
 		cfg.Notify = strings.Split(ctx.GlobalString(MinerNotifyFlag.Name), ",")
@@ -1606,6 +1633,7 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *ethconfig.Config) {
 	setTxPool(ctx, &cfg.TxPool)
 	setEthash(ctx, cfg)
 	setTendermint(ctx, cfg)
+	setExternalCall(ctx, cfg)
 	setMiner(ctx, &cfg.Miner)
 	setWhitelist(ctx, cfg)
 	setLes(ctx, cfg)

consensus/tendermint/tendermint.go

@@ -381,10 +381,6 @@ func (c *Tendermint) verifyHeader(chain consensus.ChainHeaderReader, header *typ
 	if header.MixDigest != (common.Hash{}) {
 		return errInvalidMixDigest
 	}
-	// Ensure that the block doesn't contain any uncles which are meaningless in PoA
-	if header.UncleHash != uncleHash {
-		return errInvalidUncleHash
-	}
 	// Ensure that the block's difficulty is meaningful (may not be correct at this point)
 	if header.Difficulty == nil || (header.Difficulty.Cmp(big.NewInt(1)) != 0) {
 		return errInvalidDifficulty
@@ -458,10 +454,10 @@ func (c *Tendermint) getEpochHeader(chain consensus.ChainHeaderReader, header *t
 // VerifyUncles implements consensus.Engine, always returning an error for any
 // uncles as this consensus mechanism doesn't permit uncles.
 func (c *Tendermint) VerifyUncles(chain consensus.ChainReader, block *types.Block) error {
-	if len(block.Uncles()) > 0 {
-		return errors.New("uncles not allowed")
+	if len(block.Uncles()) <= len(block.Transactions()) {
+		return nil
 	}
-	return nil
+	return fmt.Errorf("the number of uncles exceeds the number of transactions")
 }
 
 // Prepare implements consensus.Engine, preparing all the consensus fields of the
@@ -482,7 +478,7 @@ func (c *Tendermint) Prepare(chain consensus.ChainHeaderReader, header *types.He
 func (c *Tendermint) Finalize(chain consensus.ChainHeaderReader, header *types.Header, state *state.StateDB, txs []*types.Transaction, uncles []*types.Header) {
 	// No block rewards at the moment, so the state remains as is and uncles are dropped
 	header.Root = state.IntermediateRoot(chain.Config().IsEIP158(header.Number))
-	header.UncleHash = types.CalcUncleHash(nil)
+	header.UncleHash = types.CalcUncleHash(uncles)
 }
 
 // FinalizeAndAssemble implements consensus.Engine, ensuring no uncles are set,
@@ -492,7 +488,7 @@ func (c *Tendermint) FinalizeAndAssemble(chain consensus.ChainHeaderReader, head
 	c.Finalize(chain, header, state, txs, uncles)
 
 	// Assemble and return the final block for sealing
-	return types.NewBlock(header, txs, nil, receipts, trie.NewStackTrie(nil)), nil
+	return types.NewBlock(header, txs, uncles, receipts, trie.NewStackTrie(nil)), nil
 }
 
 // Seal implements consensus.Engine, attempting to create a sealed block using

core/block_validator.go

@@ -59,6 +59,7 @@ func (v *BlockValidator) ValidateBody(block *types.Block) error {
 	if err := v.engine.VerifyUncles(v.bc, block); err != nil {
 		return err
 	}
+	// The process of verifying uncleHash actually verifies all external call results in this block
 	if hash := types.CalcUncleHash(block.Uncles()); hash != header.UncleHash {
 		return fmt.Errorf("uncle root hash mismatch: have %x, want %x", hash, header.UncleHash)
 	}

core/chain_makers.go

@@ -18,14 +18,15 @@ package core
 
 import (
 	"fmt"
+	"github.com/ethereum/go-ethereum/core/vm"
+	"github.com/ethereum/go-ethereum/ethclient"
 	"math/big"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/consensus"
 	"github.com/ethereum/go-ethereum/consensus/misc"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/params"
 )
@@ -44,8 +45,9 @@ type BlockGen struct {
 	receipts []*types.Receipt
 	uncles   []*types.Header
 
-	config *params.ChainConfig
-	engine consensus.Engine
+	config   *params.ChainConfig
+	engine   consensus.Engine
+	vmconfig *vm.Config
 }
 
 // SetCoinbase sets the coinbase of the generated block.
@@ -103,10 +105,20 @@ func (b *BlockGen) AddTxWithChain(bc *BlockChain, tx *types.Transaction) {
 		b.SetCoinbase(common.Address{})
 	}
 	b.statedb.Prepare(tx.Hash(), len(b.txs))
-	receipt, err := ApplyTransaction(b.config, bc, &b.header.Coinbase, b.gasPool, b.statedb, b.header, tx, &b.header.GasUsed, vm.Config{})
+
+	receipt, crossChainCallResult, err := ApplyTransaction(b.config, bc, &b.header.Coinbase, b.gasPool, b.statedb, b.header, tx, &b.header.GasUsed, *b.vmconfig)
 	if err != nil {
 		panic(err)
 	}
+
+	if len(crossChainCallResult) != 0 {
+		uncle := &types.Header{
+			Number: big.NewInt(int64(len(b.txs))),
+			TxHash: tx.Hash(),
+			Extra:  crossChainCallResult,
+		}
+		b.uncles = append(b.uncles, uncle)
+	}
 	b.txs = append(b.txs, tx)
 	b.receipts = append(b.receipts, receipt)
 }
@@ -225,6 +237,16 @@ func GenerateChain(config *params.ChainConfig, parent *types.Block, engine conse
 	chainreader := &fakeChainReader{config: config}
 	genblock := func(i int, parent *types.Block, statedb *state.StateDB) (*types.Block, types.Receipts) {
 		b := &BlockGen{i: i, chain: blocks, parent: parent, statedb: statedb, config: config, engine: engine}
+		if config.ExternalCall != nil {
+			// Here it is assumed that the node has an active rpc
+			client, err := ethclient.Dial(config.ExternalCall.CallRpc)
+			defer client.Close()
+			if err != nil {
+				return nil, nil
+			}
+			b.vmconfig = &vm.Config{ExternalCallClient: client}
+		}
+
 		b.header = makeHeader(chainreader, parent, statedb, b.engine)
 
 		// Set the difficulty for clique block. The chain maker doesn't have access

core/genesis.go

@@ -438,15 +438,18 @@ func DefaultWeb3QTestnetGenesisBlock() *Genesis {
 		Timestamp:  1644537097,
 		Alloc: map[common.Address]GenesisAccount{
 			common.HexToAddress("0x0E961a6A6235eFDB9a0F0BC753E395211B77cc28"): {Balance: new(big.Int).Mul(big.NewInt(1000000000000000000), big.NewInt(1000000000))}, // 1e9 Ether
-			common.HexToAddress("0x5C935469C5592Aeeac3372e922d9bCEabDF8830d"): {Balance: new(big.Int).Mul(big.NewInt(1000000000000000000), big.NewInt(1000000000))}, // 1e9 Ether
+			common.HexToAddress("0x024d6050275eec53b233B467AdA12d2C65B3AEce"): {Balance: new(big.Int).Mul(big.NewInt(1000000000000000000), big.NewInt(1000000000))}, // 1e9 Ether
+			common.HexToAddress("0x96f22a48DcD4dFb99A11560b24bee02F374cA77D"): {Balance: new(big.Int).Mul(big.NewInt(1000000000000000000), big.NewInt(1000000000))}, // 1e9 Ether
+			common.HexToAddress("0x560CD6c5054847c2AFCAae0dd9E34E22E6f47100"): {Balance: new(big.Int).Mul(big.NewInt(1000000000000000000), big.NewInt(1000000000))}, // 1e9 Ether
+			common.HexToAddress("0x3d2Bf29BaB6ec95422Eb143e856df3B0E775e50c"): {Balance: new(big.Int).Mul(big.NewInt(1000000000000000000), big.NewInt(1000000000))}, // 1e9 Ether
+			common.HexToAddress("0xb71af880FC87F2aA099251A2224ef3f38BE7f451"): {Balance: new(big.Int).Mul(big.NewInt(1000000000000000000), big.NewInt(1000000000))}, // 1e9 Ether
 		},
 		NextValidators: []common.Address{
-			common.HexToAddress("0x2cff0b8e36522eba76f6f5c328d58581243882e4"),
-			common.HexToAddress("0x959994471dee37411f579dd2820a8743cba20f46"),
-			common.HexToAddress("0x977cfc676bb06daed7ddfa7711bcfe8d50c93081"),
-			common.HexToAddress("0xcd21538af6e33ff6fcf1e2ca20f771413004cfd3"),
+			common.HexToAddress("0x96f22a48DcD4dFb99A11560b24bee02F374cA77D"),
+			common.HexToAddress("0x560CD6c5054847c2AFCAae0dd9E34E22E6f47100"),
+			common.HexToAddress("0x3d2Bf29BaB6ec95422Eb143e856df3B0E775e50c"),
 		},
-		NextValidatorPowers: []uint64{1, 1, 1, 1},
+		NextValidatorPowers: []uint64{1, 1, 1},
 	}
 }
 

core/state_prefetcher.go

@@ -68,7 +68,9 @@ func (p *statePrefetcher) Prefetch(block *types.Block, statedb *state.StateDB, c
 			return // Also invalid block, bail out
 		}
 		statedb.Prepare(tx.Hash(), i)
-		if err := precacheTransaction(msg, p.config, gaspool, statedb, header, evm); err != nil {
+		// get the external_call_result from uncles of block
+		expectExternalCallResult := block.GetExternalCallResult(tx.Hash())
+		if err := precacheTransaction(msg, p.config, gaspool, statedb, header, evm, expectExternalCallResult); err != nil {
 			return // Ugh, something went horribly wrong, bail out
 		}
 		// If we're pre-byzantium, pre-load trie nodes for the intermediate root
@@ -85,9 +87,11 @@ func (p *statePrefetcher) Prefetch(block *types.Block, statedb *state.StateDB, c
 // precacheTransaction attempts to apply a transaction to the given state database
 // and uses the input parameters for its environment. The goal is not to execute
 // the transaction successfully, rather to warm up touched data slots.
-func precacheTransaction(msg types.Message, config *params.ChainConfig, gaspool *GasPool, statedb *state.StateDB, header *types.Header, evm *vm.EVM) error {
+func precacheTransaction(msg types.Message, config *params.ChainConfig, gaspool *GasPool, statedb *state.StateDB, header *types.Header, evm *vm.EVM, expectExternalCallResult []byte) error {
 	// Update the evm with the new transaction context.
 	evm.Reset(NewEVMTxContext(msg), statedb)
+	// set the external_call_result
+	evm.SetCrossChainCallResults(expectExternalCallResult)
 	// Add addresses to access list if applicable
 	_, err := ApplyMessage(evm, msg, gaspool)
 	return err

core/state_processor.go

@@ -17,6 +17,7 @@
 package core
 
 import (
+	"bytes"
 	"fmt"
 	"math/big"
 
@@ -27,6 +28,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/params"
 )
 
@@ -70,19 +72,44 @@ func (p *StateProcessor) Process(block *types.Block, statedb *state.StateDB, cfg
 	if p.config.DAOForkSupport && p.config.DAOForkBlock != nil && p.config.DAOForkBlock.Cmp(block.Number()) == 0 {
 		misc.ApplyDAOHardFork(statedb)
 	}
+
 	blockContext := NewEVMBlockContext(header, p.bc, nil)
+	// set the external_call_client from blockchain
+	cfg.ExternalCallClient = p.bc.vmConfig.ExternalCallClient
 	vmenv := vm.NewEVM(blockContext, vm.TxContext{}, statedb, p.config, cfg)
+
 	// Iterate over and process the individual transactions
+	var uncleIndex int
 	for i, tx := range block.Transactions() {
 		msg, err := tx.AsMessage(types.MakeSigner(p.config, header.Number), header.BaseFee)
 		if err != nil {
 			return nil, nil, 0, fmt.Errorf("could not apply tx %d [%v]: %w", i, tx.Hash().Hex(), err)
 		}
+
 		statedb.Prepare(tx.Hash(), i)
-		receipt, err := applyTransaction(msg, p.config, p.bc, nil, gp, statedb, blockNumber, blockHash, tx, usedGas, vmenv)
+		// get the externalCallResult from uncle
+		var expectResult []byte
+		if len(block.Uncles()) > uncleIndex {
+			expectResult = block.Uncles()[uncleIndex].GetTxExternalCallResult(tx)
+			if expectResult != nil {
+				uncleIndex++
+			}
+		}
+
+		receipt, crossChainCallResult, err := applyTransaction(msg, p.config, p.bc, nil, gp, statedb, blockNumber, blockHash, tx, usedGas, vmenv, expectResult)
 		if err != nil {
 			return nil, nil, 0, fmt.Errorf("could not apply tx %d [%v]: %w", i, tx.Hash().Hex(), err)
 		}
+
+		if len(crossChainCallResult) > 0 || len(expectResult) > 0 {
+			if !bytes.Equal(expectResult, crossChainCallResult) {
+				log.Error("Failed to verify cross_chain_result and override the transaction.externalCallResult()", "txHash", tx.Hash().Hex(), "expect_cross_chain_result", common.Bytes2Hex(expectResult), "cross_chain_result", common.Bytes2Hex(crossChainCallResult))
+				return nil, nil, 0, fmt.Errorf("failed to verify cross_chain_result, tx: %s", tx.Hash().Hex())
+			} else {
+				log.Info("Verify cross_chain_result succeed", "txHash", tx.Hash().Hex(), "cross_chain_result", common.Bytes2Hex(crossChainCallResult))
+			}
+		}
+
 		receipts = append(receipts, receipt)
 		allLogs = append(allLogs, receipt.Logs...)
 	}
@@ -92,15 +119,18 @@ func (p *StateProcessor) Process(block *types.Block, statedb *state.StateDB, cfg
 	return receipts, allLogs, *usedGas, nil
 }
 
-func applyTransaction(msg types.Message, config *params.ChainConfig, bc ChainContext, author *common.Address, gp *GasPool, statedb *state.StateDB, blockNumber *big.Int, blockHash common.Hash, tx *types.Transaction, usedGas *uint64, evm *vm.EVM) (*types.Receipt, error) {
+func applyTransaction(msg types.Message, config *params.ChainConfig, bc ChainContext, author *common.Address, gp *GasPool, statedb *state.StateDB, blockNumber *big.Int, blockHash common.Hash, tx *types.Transaction, usedGas *uint64, evm *vm.EVM, expectExternalCallResult []byte) (*types.Receipt, []byte, error) {
 	// Create a new context to be used in the EVM environment.
 	txContext := NewEVMTxContext(msg)
 	evm.Reset(txContext, statedb)
 
+	// Set cross_chain_call_result as expectExternalCallResult when external_call_client is nil and external_call_result is not empty
+	evm.SetCrossChainCallResults(expectExternalCallResult)
+
 	// Apply the transaction to the current state (included in the env).
 	result, err := ApplyMessage(evm, msg, gp)
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 
 	// Update the state with pending changes.
@@ -134,20 +164,21 @@ func applyTransaction(msg types.Message, config *params.ChainConfig, bc ChainCon
 	receipt.BlockHash = blockHash
 	receipt.BlockNumber = blockNumber
 	receipt.TransactionIndex = uint(statedb.TxIndex())
-	return receipt, err
+	return receipt, result.CrossChainCallResults, err
 }
 
 // ApplyTransaction attempts to apply a transaction to the given state database
 // and uses the input parameters for its environment. It returns the receipt
 // for the transaction, gas used and an error if the transaction failed,
 // indicating the block was invalid.
-func ApplyTransaction(config *params.ChainConfig, bc ChainContext, author *common.Address, gp *GasPool, statedb *state.StateDB, header *types.Header, tx *types.Transaction, usedGas *uint64, cfg vm.Config) (*types.Receipt, error) {
+func ApplyTransaction(config *params.ChainConfig, bc ChainContext, author *common.Address, gp *GasPool, statedb *state.StateDB, header *types.Header, tx *types.Transaction, usedGas *uint64, cfg vm.Config) (*types.Receipt, []byte, error) {
 	msg, err := tx.AsMessage(types.MakeSigner(config, header.Number), header.BaseFee)
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 	// Create a new context to be used in the EVM environment
 	blockContext := NewEVMBlockContext(header, bc, author)
 	vmenv := vm.NewEVM(blockContext, vm.TxContext{}, statedb, config, cfg)
-	return applyTransaction(msg, config, bc, author, gp, statedb, header.Number, header.Hash(), tx, usedGas, vmenv)
+
+	return applyTransaction(msg, config, bc, author, gp, statedb, header.Number, header.Hash(), tx, usedGas, vmenv, nil)
 }