nimbus-eth1/nimbus/p2p/executor.nim

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import options, sets,
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eth/[common, bloom], stew/ranges, chronicles, nimcrypto,
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../db/[db_chain, state_db],
../utils, ../constants, ../transaction,
../vm_state, ../vm_types, ../vm_state_transactions,
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../vm/[computation, message],
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../vm/interpreter/vm_forks,
./dao
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proc processTransaction*(tx: Transaction, sender: EthAddress, vmState: BaseVMState, fork: Fork): GasInt =
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## Process the transaction, write the results to db.
## Returns amount of ETH to be rewarded to miner
trace "Sender", sender
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trace "txHash", rlpHash = tx.rlpHash
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if fork >= FkSpurious:
vmState.touchedAccounts.incl(vmState.blockHeader.coinbase)
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var gasUsed = tx.gasLimit
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block:
if vmState.cumulativeGasUsed + gasUsed > vmState.blockHeader.gasLimit:
debug "invalid tx: block header gasLimit reached",
blockGasLimit=vmState.blockHeader.gasLimit,
gasUsed=gasUsed,
txGasLimit=tx.gasLimit
gasUsed = 0
break
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let upfrontGasCost = tx.gasLimit.u256 * tx.gasPrice.u256
var balance = vmState.readOnlyStateDb().getBalance(sender)
if balance < upfrontGasCost: break
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let recipient = tx.getRecipient()
let isCollision = vmState.readOnlyStateDb().hasCodeOrNonce(recipient)
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var computation = setupComputation(vmState, tx, sender, recipient, fork)
if computation.isNil: # OOG in setupComputation
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gasUsed = 0
break
vmState.mutateStateDB:
db.incNonce(sender)
db.subBalance(sender, upfrontGasCost)
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if tx.isContractCreation and isCollision: break
execComputation(computation)
if not computation.shouldBurnGas:
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gasUsed = computation.refundGas(tx, sender)
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if computation.isSuicided(vmState.blockHeader.coinbase):
gasUsed = 0
vmState.cumulativeGasUsed += gasUsed
# miner fee
let txFee = gasUsed.u256 * tx.gasPrice.u256
vmState.mutateStateDB:
db.addBalance(vmState.blockHeader.coinbase, txFee)
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# EIP158 state clearing
for account in vmState.touchedAccounts:
if db.accountExists(account) and db.isEmptyAccount(account):
debug "state clearing", account
db.deleteAccount(account)
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result = gasUsed
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type
# TODO: these types need to be removed
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# once eth/bloom and eth/common sync'ed
Bloom = common.BloomFilter
LogsBloom = bloom.BloomFilter
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# TODO: move these three receipt procs below somewhere else more appropriate
func logsBloom(logs: openArray[Log]): LogsBloom =
for log in logs:
result.incl log.address
for topic in log.topics:
result.incl topic
func createBloom*(receipts: openArray[Receipt]): Bloom =
var bloom: LogsBloom
for receipt in receipts:
bloom.value = bloom.value or logsBloom(receipt.logs).value
result = bloom.value.toByteArrayBE
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proc makeReceipt(vmState: BaseVMState, fork = FkFrontier): Receipt =
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if fork < FkByzantium:
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result.stateRootOrStatus = hashOrStatus(vmState.accountDb.rootHash)
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else:
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result.stateRootOrStatus = hashOrStatus(vmState.status)
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result.cumulativeGasUsed = vmState.cumulativeGasUsed
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result.logs = vmState.getAndClearLogEntries()
result.bloom = logsBloom(result.logs).value.toByteArrayBE
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func eth(n: int): Uint256 {.compileTime.} =
n.u256 * pow(10.u256, 18)
const
eth5 = 5.eth
eth3 = 3.eth
eth2 = 2.eth
blockRewards: array[Fork, Uint256] = [
eth5, # FkFrontier
eth5, # FkThawing
eth5, # FkHomestead
eth5, # FkDao
eth5, # FkTangerine
eth5, # FkSpurious
eth3, # FkByzantium
eth2 # FkConstantinople
]
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proc processBlock*(chainDB: BaseChainDB, header: BlockHeader, body: BlockBody, vmState: BaseVMState): ValidationResult =
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if chainDB.config.daoForkSupport and header.blockNumber == chainDB.config.daoForkBlock:
vmState.mutateStateDB:
db.applyDAOHardFork()
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if body.transactions.calcTxRoot != header.txRoot:
debug "Mismatched txRoot", blockNumber=header.blockNumber
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return ValidationResult.Error
let fork = vmState.blockNumber.toFork
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if header.txRoot != BLANK_ROOT_HASH:
if body.transactions.len == 0:
debug "No transactions in body", blockNumber=header.blockNumber
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return ValidationResult.Error
else:
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trace "Has transactions", blockNumber = header.blockNumber, blockHash = header.blockHash
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vmState.receipts = newSeq[Receipt](body.transactions.len)
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vmState.cumulativeGasUsed = 0
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for txIndex, tx in body.transactions:
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var sender: EthAddress
if tx.getSender(sender):
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let gasUsed = processTransaction(tx, sender, vmState, fork)
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else:
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debug "Could not get sender", txIndex, tx
return ValidationResult.Error
vmState.receipts[txIndex] = makeReceipt(vmState, fork)
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let blockReward = blockRewards[fork]
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var mainReward = blockReward
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if header.ommersHash != EMPTY_UNCLE_HASH:
let h = chainDB.persistUncles(body.uncles)
if h != header.ommersHash:
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debug "Uncle hash mismatch"
return ValidationResult.Error
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for uncle in body.uncles:
var uncleReward = uncle.blockNumber.u256 + 8.u256
uncleReward -= header.blockNumber.u256
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uncleReward = uncleReward * blockReward
uncleReward = uncleReward div 8.u256
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vmState.mutateStateDB:
db.addBalance(uncle.coinbase, uncleReward)
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mainReward += blockReward div 32.u256
# Reward beneficiary
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vmState.mutateStateDB:
db.addBalance(header.coinbase, mainReward)
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let stateDb = vmState.accountDb
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if header.stateRoot != stateDb.rootHash:
error "Wrong state root in block", blockNumber=header.blockNumber, expected=header.stateRoot, actual=stateDb.rootHash, arrivedFrom=chainDB.getCanonicalHead().stateRoot
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# this one is a show stopper until we are confident in our VM's
# compatibility with the main chain
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return ValidationResult.Error
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let bloom = createBloom(vmState.receipts)
if header.bloom != bloom:
debug "wrong bloom in block", blockNumber=header.blockNumber
return ValidationResult.Error
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let receiptRoot = calcReceiptRoot(vmState.receipts)
if header.receiptRoot != receiptRoot:
debug "wrong receiptRoot in block", blockNumber=header.blockNumber, actual=receiptRoot, expected=header.receiptRoot
return ValidationResult.Error