nimbus-eth1/nimbus/vm_state_transactions.nim

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# Nimbus
# Copyright (c) 2018 Status Research & Development GmbH
# Licensed under either of
# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
# at your option. This file may not be copied, modified, or distributed except according to those terms.
import
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stew/ranges/typedranges, options, sets,
eth/common, chronicles, ./db/state_db,
transaction, vm_types, vm_state,
./vm/[computation, interpreter]
proc validateTransaction*(vmState: BaseVMState, tx: Transaction, sender: EthAddress, fork: Fork): bool =
# XXX: https://github.com/status-im/nimbus/issues/35#issuecomment-391726518
# XXX: lots of avoidable u256 construction
let
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account = vmState.readOnlyStateDB.getAccount(sender)
gasLimit = tx.gasLimit.u256
limitAndValue = gasLimit + tx.value
gasCost = gasLimit * tx.gasPrice.u256
tx.gasLimit >= tx.intrinsicGas(fork) and
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#transaction.gasPrice <= (1 shl 34) and
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limitAndValue <= account.balance and
tx.accountNonce == account.nonce and
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account.balance >= gasCost
proc setupComputation*(vmState: BaseVMState, tx: Transaction, sender, recipient: EthAddress, fork: Fork) : Computation =
var gas = tx.gasLimit - tx.intrinsicGas(fork)
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# TODO: refactor message to use byterange
# instead of seq[byte]
var data, code: seq[byte]
if tx.isContractCreation:
data = @[]
code = tx.payload
else:
data = tx.payload
code = vmState.readOnlyStateDB.getCode(tx.to).toSeq
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if gas < 0:
debug "not enough gas to perform calculation", gas=gas
return
vmState.txContext(
origin = sender,
gasPrice = tx.gasPrice,
forkOverride = some(fork)
)
let msg = Message(
kind: if tx.isContractCreation: evmcCreate else: evmcCall,
depth: 0,
gas: gas,
sender: sender,
contractAddress: recipient,
codeAddress: tx.to,
value: tx.value,
data: data,
code: code
)
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result = newComputation(vmState, msg)
doAssert result.isOriginComputation
proc execComputation*(c: Computation) =
if c.msg.isCreate:
c.applyMessage(Create)
else:
c.applyMessage(Call)
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if c.fork >= FkSpurious:
c.collectTouchedAccounts()
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if c.isSuccess:
c.refundSelfDestruct()
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c.vmState.suicides = c.getSuicides()
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c.vmstate.status = c.isSuccess
if c.isSuccess:
c.vmState.addLogs(c.logEntries)
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proc refundGas*(c: Computation, tx: Transaction, sender: EthAddress): GasInt =
let
gasRemaining = c.gasMeter.gasRemaining
gasRefunded = c.getGasRefund()
gasUsed = tx.gasLimit - gasRemaining
gasRefund = min(gasRefunded, gasUsed div 2)
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c.vmState.mutateStateDB:
db.addBalance(sender, (gasRemaining + gasRefund).u256 * tx.gasPrice.u256)
result = gasUsed - gasRefund
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#[
method executeTransaction(vmState: BaseVMState, transaction: Transaction): (Computation, BlockHeader) {.base.}=
# Execute the transaction in the vm
# TODO: introduced here: https://github.com/ethereum/py-evm/commit/21c57f2d56ab91bb62723c3f9ebe291d0b132dde
# Refactored/Removed here: https://github.com/ethereum/py-evm/commit/cc991bf
# Deleted here: https://github.com/ethereum/py-evm/commit/746defb6f8e83cee2c352a0ab8690e1281c4227c
raise newException(ValueError, "Must be implemented by subclasses")
method addTransaction*(vmState: BaseVMState, transaction: Transaction, c: Computation, b: Block): (Block, Table[string, string]) =
# Add a transaction to the given block and
# return `trieData` to store the transaction data in chaindb in VM layer
# Update the bloomFilter, transaction trie and receipt trie roots, bloom_filter,
# bloom, and usedGas of the block
# transaction: the executed transaction
# computation: the Computation object with executed result
# block: the Block which the transaction is added in
# var receipt = vmState.makeReceipt(transaction, computation)
# vmState.add_receipt(receipt)
# block.transactions.append(transaction)
# # Get trie roots and changed key-values.
# tx_root_hash, tx_kv_nodes = make_trie_root_and_nodes(block.transactions)
# receipt_root_hash, receipt_kv_nodes = make_trie_root_and_nodes(self.receipts)
# trie_data = merge(tx_kv_nodes, receipt_kv_nodes)
# block.bloom_filter |= receipt.bloom
# block.header.transaction_root = tx_root_hash
# block.header.receipt_root = receipt_root_hash
# block.header.bloom = int(block.bloom_filter)
# block.header.gas_used = receipt.gas_used
# return block, trie_data
result = (b, initTable[string, string]())
method applyTransaction*(
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vmState: BaseVMState,
transaction: Transaction,
b: Block,
isStateless: bool): (Computation, Block, Table[string, string]) =
# Apply transaction to the given block
# transaction: the transaction need to be applied
# b: the block which the transaction applies on
# isStateless: if isStateless, call vmState.addTransaction to set block
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if isStateless:
var ourBlock = b # deepcopy
vmState.blockHeader = b.header
var (computation, blockHeader) = vmState.executeTransaction(transaction)
ourBlock.header = blockHeader
var trieData: Table[string, string]
(ourBlock, trieData) = vmState.addTransaction(transaction, computation, ourBlock)
result = (computation, ourBlock, trieData)
else:
var (computation, blockHeader) = vmState.executeTransaction(transaction)
return (computation, nil, initTable[string, string]())
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]#