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
ranges/typedranges, sequtils, strformat, tables,
eth_common,
./constants, ./errors, ./vm/computation,
./transaction, ./vm_types, ./vm_state, ./block_types, ./db/[db_chain, state_db], ./utils/header,
./vm/interpreter, ./utils/addresses
func intrinsicGas*(data: openarray[byte]): GasInt =
result = 21_000
for i in data:
if i == 0:
result += 4
else:
result += 68
proc validateTransaction*(vmState: BaseVMState, transaction: Transaction, sender: EthAddress): bool =
# XXX: https://github.com/status-im/nimbus/issues/35#issuecomment-391726518
# XXX: lots of avoidable u256 construction
var readOnlyDB = vmState.readOnlyStateDB
let limitAndValue = transaction.gasLimit.u256 + transaction.value
let gas_cost = transaction.gasLimit.u256 * transaction.gasPrice.u256
transaction.gasLimit >= transaction.payload.intrinsicGas and
transaction.gasPrice <= (1 shl 34) and
limitAndValue <= readOnlyDB.getBalance(sender) and
transaction.accountNonce == readOnlyDB.getNonce(sender) and
readOnlyDB.getBalance(sender) >= gas_cost
proc setupComputation*(header: BlockHeader, vmState: var BaseVMState, transaction: Transaction, sender: EthAddress) : BaseComputation =
let message = newMessage(
gas = transaction.gasLimit - transaction.payload.intrinsicGas,
gasPrice = transaction.gasPrice,
to = transaction.to,
sender = sender,
value = transaction.value,
data = transaction.payload,
code = vmState.readOnlyStateDB.getCode(transaction.to).toSeq,
options = newMessageOptions(origin = sender,
createAddress = transaction.to))
result = newBaseComputation(vmState, header.blockNumber, message)
doAssert result.isOriginComputation
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proc execComputation*(computation: var BaseComputation): bool =
try:
computation.executeOpcodes()
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computation.vmState.mutateStateDB:
for deletedAccount in computation.getAccountsForDeletion:
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db.deleteAccount deletedAccount
result = not computation.isError
except ValueError:
result = false
proc applyCreateTransaction*(db: var AccountStateDB, t: Transaction, head: BlockHeader, vmState: var BaseVMState, sender: EthAddress, useHomestead: bool = false): UInt256 =
doAssert t.isContractCreation
# TODO: clean up params
echo "Contract creation"
let gasUsed = t.payload.intrinsicGas.GasInt + (if useHomestead: 32000 else: 0)
# TODO: setupComputation refactoring
let contractAddress = generateAddress(sender, t.accountNonce)
let msg = newMessage(t.gasLimit - gasUsed, t.gasPrice, t.to, sender, t.value, @[], t.payload,
options = newMessageOptions(origin = sender,
createAddress = contractAddress))
var c = newBaseComputation(vmState, head.blockNumber, msg)
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if execComputation(c):
db.addBalance(contractAddress, t.value)
# XXX: copy/pasted from GST fixture
# TODO: more merging/refactoring/etc
# also a couple lines can collapse because variable used once
# once verified in GST fixture
let
gasRemaining = c.gasMeter.gasRemaining.u256
gasRefunded = c.gasMeter.gasRefunded.u256
gasUsed2 = t.gasLimit.u256 - gasRemaining
gasRefund = min(gasRefunded, gasUsed2 div 2)
gasRefundAmount = (gasRefund + gasRemaining) * t.gasPrice.u256
#echo "gasRemaining is ", gasRemaining, " and gasRefunded = ", gasRefunded, " and gasUsed2 = ", gasUsed2, " and gasRefund = ", gasRefund, " and gasRefundAmount = ", gasRefundAmount
var codeCost = 200 * c.output.len
# This apparently is not supposed to actually consume the gas, just be able to,
# for purposes of accounting. Py-EVM apparently does consume the gas, but it is
# not matching observed blockchain balances if consumeGas is called.
if gasRemaining >= codeCost.u256:
db.setCode(contractAddress, c.output.toRange)
else:
# XXX: Homestead behaves differently; reverts state on gas failure
# https://github.com/ethereum/py-evm/blob/master/eth/vm/forks/homestead/computation.py
codeCost = 0
db.setCode(contractAddress, ByteRange())
db.addBalance(sender, (t.gasLimit.u256 - gasUsed2 - codeCost.u256)*t.gasPrice.u256)
return (gasUsed2 + codeCost.u256) * t.gasPrice.u256
else:
# FIXME: don't do this revert, but rather only subBalance correctly
# the if transactionfailed at end is what is supposed to pick it up
# especially when it's cross-function, it's ugly/fragile
db.addBalance(sender, t.value)
echo "isError: ", c.isError
return t.gasLimit.u256 * t.gasPrice.u256
method executeTransaction(vmState: var BaseVMState, transaction: Transaction): (BaseComputation, 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: var BaseVMState, transaction: Transaction, computation: BaseComputation, 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*(
vmState: var BaseVMState,
transaction: Transaction,
b: Block,
isStateless: bool): (BaseComputation, 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]())