/
state_processor.go
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/
state_processor.go
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// This file is part of the go-sberex library. The go-sberex library is
// free software: you can redistribute it and/or modify it under the terms
// of the GNU Lesser General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// The go-sberex library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
// General Public License <http://www.gnu.org/licenses/> for more details.
package core
import (
"github.com/Sberex/go-sberex/common"
"github.com/Sberex/go-sberex/consensus"
"github.com/Sberex/go-sberex/consensus/misc"
"github.com/Sberex/go-sberex/core/state"
"github.com/Sberex/go-sberex/core/types"
"github.com/Sberex/go-sberex/core/vm"
"github.com/Sberex/go-sberex/crypto"
"github.com/Sberex/go-sberex/params"
)
// StateProcessor is a basic Processor, which takes care of transitioning
// state from one point to another.
//
// StateProcessor implements Processor.
type StateProcessor struct {
config *params.ChainConfig // Chain configuration options
bc *BlockChain // Canonical block chain
engine consensus.Engine // Consensus engine used for block rewards
}
// NewStateProcessor initialises a new StateProcessor.
func NewStateProcessor(config *params.ChainConfig, bc *BlockChain, engine consensus.Engine) *StateProcessor {
return &StateProcessor{
config: config,
bc: bc,
engine: engine,
}
}
// Process processes the state changes according to the Sberex rules by running
// the transaction messages using the statedb and applying any rewards to both
// the processor (coinbase) and any included uncles.
//
// Process returns the receipts and logs accumulated during the process and
// returns the amount of gas that was used in the process. If any of the
// transactions failed to execute due to insufficient gas it will return an error.
func (p *StateProcessor) Process(block *types.Block, statedb *state.StateDB, cfg vm.Config) (types.Receipts, []*types.Log, uint64, error) {
var (
receipts types.Receipts
usedGas = new(uint64)
header = block.Header()
allLogs []*types.Log
gp = new(GasPool).AddGas(block.GasLimit())
)
// Mutate the the block and state according to any hard-fork specs
if p.config.DAOForkSupport && p.config.DAOForkBlock != nil && p.config.DAOForkBlock.Cmp(block.Number()) == 0 {
misc.ApplyDAOHardFork(statedb)
}
// Iterate over and process the individual transactions
for i, tx := range block.Transactions() {
statedb.Prepare(tx.Hash(), block.Hash(), i)
receipt, _, err := ApplyTransaction(p.config, p.bc, nil, gp, statedb, header, tx, usedGas, cfg)
if err != nil {
return nil, nil, 0, err
}
receipts = append(receipts, receipt)
allLogs = append(allLogs, receipt.Logs...)
}
// Finalize the block, applying any consensus engine specific extras (e.g. block rewards)
p.engine.Finalize(p.bc, header, statedb, block.Transactions(), block.Uncles(), receipts)
return receipts, allLogs, *usedGas, nil
}
// 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 *BlockChain, author *common.Address, gp *GasPool, statedb *state.StateDB, header *types.Header, tx *types.Transaction, usedGas *uint64, cfg vm.Config) (*types.Receipt, uint64, error) {
msg, err := tx.AsMessage(types.MakeSigner(config, header.Number))
if err != nil {
return nil, 0, err
}
// Create a new context to be used in the EVM environment
context := NewEVMContext(msg, header, bc, author)
// Create a new environment which holds all relevant information
// about the transaction and calling mechanisms.
vmenv := vm.NewEVM(context, statedb, config, cfg)
// Apply the transaction to the current state (included in the env)
_, gas, failed, err := ApplyMessage(vmenv, msg, gp)
if err != nil {
return nil, 0, 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 += gas
// Create a new receipt for the transaction, storing the intermediate root and gas used by the tx
// based on the eip phase, we're passing wether the root touch-delete accounts.
receipt := types.NewReceipt(root, failed, *usedGas)
receipt.TxHash = tx.Hash()
receipt.GasUsed = gas
// if the transaction created a contract, store the creation address in the receipt.
if msg.To() == nil {
receipt.ContractAddress = crypto.CreateAddress(vmenv.Context.Origin, tx.Nonce())
}
// Set the receipt logs and create a bloom for filtering
receipt.Logs = statedb.GetLogs(tx.Hash())
receipt.Bloom = types.CreateBloom(types.Receipts{receipt})
return receipt, gas, err
}