flashbots: Add eth_callBundle and eth_estimateGasBundle

Author: jparyani

core/state_processor.go

@@ -137,6 +137,51 @@ func applyTransaction(msg types.Message, config *params.ChainConfig, author *com
 	return receipt, err
 }
 
+func applyTransactionWithResult(msg types.Message, config *params.ChainConfig, bc ChainContext, author *common.Address, gp *GasPool, statedb *state.StateDB, header *types.Header, tx *types.Transaction, usedGas *uint64, evm *vm.EVM) (*types.Receipt, *ExecutionResult, error) {
+	// Create a new context to be used in the EVM environment.
+	txContext := NewEVMTxContext(msg)
+	evm.Reset(txContext, statedb)
+
+	// Apply the transaction to the current state (included in the env).
+	result, err := ApplyMessage(evm, msg, gp)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// Update the state with pending changes.
+	var root []byte
+	if config.IsByzantium(header.Number) {
+		statedb.Finalise(true)
+	} else {
+		root = statedb.IntermediateRoot(config.IsEIP158(header.Number)).Bytes()
+	}
+	*usedGas += result.UsedGas
+
+	// Create a new receipt for the transaction, storing the intermediate root and gas used
+	// by the tx.
+	receipt := &types.Receipt{Type: tx.Type(), PostState: root, CumulativeGasUsed: *usedGas}
+	if result.Failed() {
+		receipt.Status = types.ReceiptStatusFailed
+	} else {
+		receipt.Status = types.ReceiptStatusSuccessful
+	}
+	receipt.TxHash = tx.Hash()
+	receipt.GasUsed = result.UsedGas
+
+	// If the transaction created a contract, store the creation address in the receipt.
+	if msg.To() == nil {
+		receipt.ContractAddress = crypto.CreateAddress(evm.TxContext.Origin, tx.Nonce())
+	}
+
+	// Set the receipt logs and create the bloom filter.
+	receipt.Logs = statedb.GetLogs(tx.Hash(), header.Hash())
+	receipt.Bloom = types.CreateBloom(types.Receipts{receipt})
+	receipt.BlockHash = header.Hash()
+	receipt.BlockNumber = header.Number
+	receipt.TransactionIndex = uint(statedb.TxIndex())
+	return receipt, result, 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,
@@ -151,3 +196,14 @@ func ApplyTransaction(config *params.ChainConfig, bc ChainContext, author *commo
 	vmenv := vm.NewEVM(blockContext, vm.TxContext{}, statedb, config, cfg)
 	return applyTransaction(msg, config, author, gp, statedb, header.Number, header.Hash(), tx, usedGas, vmenv)
 }
+
+func ApplyTransactionWithResult(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, *ExecutionResult, error) {
+	msg, err := tx.AsMessage(types.MakeSigner(config, header.Number), header.BaseFee)
+	if err != nil {
+		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 applyTransactionWithResult(msg, config, bc, author, gp, statedb, header, tx, usedGas, vmenv)
+}

eth/backend.go

@@ -297,7 +297,7 @@ func makeExtraData(extra []byte) []byte {
 // APIs return the collection of RPC services the ethereum package offers.
 // NOTE, some of these services probably need to be moved to somewhere else.
 func (s *Ethereum) APIs() []rpc.API {
-	apis := ethapi.GetAPIs(s.APIBackend)
+	apis := ethapi.GetAPIs(s.APIBackend, s.BlockChain())
 
 	// Append any APIs exposed explicitly by the consensus engine
 	apis = append(apis, s.engine.APIs(s.BlockChain())...)