def run_computation(self, transaction, message):
"""Apply the message to the VM."""
transaction_context = self.get_transaction_context_class()(
gas_price=transaction.gas_price,
origin=transaction.sender,
)
if message.is_create:
is_collision = self.read_only_state_db.account_has_code_or_nonce(
message.storage_address)
if is_collision:
# The address of the newly created contract has *somehow* collided
# with an existing contract address.
computation = self.get_computation(message,
transaction_context)
computation._error = ContractCreationCollision(
"Address collision while creating contract: {0}".format(
encode_hex(message.storage_address), ))
self.logger.debug(
"Address collision while creating contract: %s",
encode_hex(message.storage_address),
)
else:
computation = self.get_computation(
message,
transaction_context,
).apply_create_message()
else:
computation = self.get_computation(
message, transaction_context).apply_message()
return computation
def build_computation(self, message, transaction):
"""Apply the message to the VM."""
transaction_context = self.get_transaction_context(transaction)
if message.is_create:
is_collision = self.vm_state.account_db.account_has_code_or_nonce(
message.storage_address)
if is_collision:
# The address of the newly created contract has *somehow* collided
# with an existing contract address.
computation = self.vm_state.get_computation(
message, transaction_context)
computation._error = ContractCreationCollision(
"Address collision while creating contract: {0}".format(
encode_hex(message.storage_address), ))
self.vm_state.logger.debug(
"Address collision while creating contract: %s",
encode_hex(message.storage_address),
)
else:
computation = self.vm_state.get_computation(
message,
transaction_context,
).apply_create_message()
else:
computation = self.vm_state.get_computation(
message, transaction_context).apply_message()
return computation
def run_computation(self, transaction, message):
"""Apply the message to the VM."""
state_db_cm = functools.partial(self.state_db,
access_list=transaction.prefix_list)
if transaction.code:
contract_address = generate_CREATE2_contract_address(
transaction.salt,
transaction.code,
)
else:
contract_address = None
transaction_context = self.get_transaction_context_class()(
origin=transaction.to,
sig_hash=transaction.sig_hash,
transaction_gas_limit=transaction.gas,
)
if message.is_create:
with state_db_cm(read_only=True) as state_db:
is_collision = state_db.account_has_code(contract_address)
# Check if contract address provided by transaction is correct
if contract_address != transaction.to:
computation = self.get_computation(message,
transaction_context)
computation._error = IncorrectContractCreationAddress(
"Contract address calculated: {0} but {1} is provided".
format(
encode_hex(contract_address),
encode_hex(transaction.to),
))
self.logger.debug(
"Contract address calculated: %s but %s is provided",
encode_hex(contract_address),
encode_hex(transaction.to),
)
elif is_collision:
# The address of the newly created contract has collided
# with an existing contract address.
computation = self.get_computation(message,
transaction_context)
computation._error = ContractCreationCollision(
"Address collision while creating contract: {0}".format(
encode_hex(contract_address), ))
self.logger.debug(
"Address collision while creating contract: %s",
encode_hex(contract_address),
)
else:
computation = self.get_computation(
message,
transaction_context,
).apply_create_message()
else:
computation = self.get_computation(
message, transaction_context).apply_message()
return computation
def _execute_frontier_transaction(vm_state, transaction):
# Reusable for other forks
#
# 1) Pre Computation
#
# Validate the transaction
transaction.validate()
vm_state.validate_transaction(transaction)
gas_fee = transaction.gas * transaction.gas_price
with vm_state.state_db() as state_db:
# Buy Gas
state_db.delta_balance(transaction.sender, -1 * gas_fee)
# Increment Nonce
state_db.increment_nonce(transaction.sender)
# Setup VM Message
message_gas = transaction.gas - transaction.intrinsic_gas
if transaction.to == constants.CREATE_CONTRACT_ADDRESS:
contract_address = generate_contract_address(
transaction.sender,
state_db.get_nonce(transaction.sender) - 1,
)
data = b''
code = transaction.data
else:
contract_address = None
data = transaction.data
code = state_db.get_code(transaction.to)
vm_state.logger.info(
("TRANSACTION: sender: %s | to: %s | value: %s | gas: %s | "
"gas-price: %s | s: %s | r: %s | v: %s | data-hash: %s"),
encode_hex(transaction.sender),
encode_hex(transaction.to),
transaction.value,
transaction.gas,
transaction.gas_price,
transaction.s,
transaction.r,
transaction.v,
encode_hex(keccak(transaction.data)),
)
message = Message(
gas=message_gas,
to=transaction.to,
sender=transaction.sender,
value=transaction.value,
data=data,
code=code,
create_address=contract_address,
)
transaction_context = vm_state.get_transaction_context_class()(
gas_price=transaction.gas_price,
origin=transaction.sender,
)
#
# 2) Apply the message to the VM.
#
if message.is_create:
with vm_state.state_db(read_only=True) as state_db:
is_collision = state_db.account_has_code_or_nonce(contract_address)
if is_collision:
# The address of the newly created contract has *somehow* collided
# with an existing contract address.
computation = vm_state.get_computation(message,
transaction_context)
computation._error = ContractCreationCollision(
"Address collision while creating contract: {0}".format(
encode_hex(contract_address), ))
vm_state.logger.debug(
"Address collision while creating contract: %s",
encode_hex(contract_address),
)
else:
computation = vm_state.get_computation(
message,
transaction_context,
).apply_create_message()
else:
computation = vm_state.get_computation(
message, transaction_context).apply_message()
#
# 2) Post Computation
#
# Self Destruct Refunds
num_deletions = len(computation.get_accounts_for_deletion())
if num_deletions:
computation.gas_meter.refund_gas(REFUND_SELFDESTRUCT * num_deletions)
# Gas Refunds
gas_remaining = computation.get_gas_remaining()
gas_refunded = computation.get_gas_refund()
gas_used = transaction.gas - gas_remaining
gas_refund = min(gas_refunded, gas_used // 2)
gas_refund_amount = (gas_refund + gas_remaining) * transaction.gas_price
if gas_refund_amount:
vm_state.logger.debug(
'TRANSACTION REFUND: %s -> %s',
gas_refund_amount,
encode_hex(message.sender),
)
with vm_state.state_db() as state_db:
state_db.delta_balance(message.sender, gas_refund_amount)
# Miner Fees
transaction_fee = (transaction.gas - gas_remaining -
gas_refund) * transaction.gas_price
vm_state.logger.debug(
'TRANSACTION FEE: %s -> %s',
transaction_fee,
encode_hex(vm_state.coinbase),
)
with vm_state.state_db() as state_db:
state_db.delta_balance(vm_state.coinbase, transaction_fee)
# Process Self Destructs
with vm_state.state_db() as state_db:
for account, beneficiary in computation.get_accounts_for_deletion():
# TODO: need to figure out how we prevent multiple selfdestructs from
# the same account and if this is the right place to put this.
vm_state.logger.debug('DELETING ACCOUNT: %s', encode_hex(account))
# TODO: this balance setting is likely superflous and can be
# removed since `delete_account` does this.
state_db.set_balance(account, 0)
state_db.delete_account(account)
return computation
def execute_transaction(self, transaction):
# state_db ontext manager that restricts access as specified in the transacion
state_db_cm = functools.partial(self.state_db,
access_list=transaction.prefix_list)
#
# 1) Pre Computation
#
# Validate the transaction
transaction.validate()
self.validate_transaction(transaction)
with state_db_cm() as state_db:
# Setup VM Message
message_gas = transaction.gas - transaction.intrinsic_gas
if transaction.code:
contract_address = generate_CREATE2_contract_address(
transaction.salt,
transaction.code,
)
data = b''
code = transaction.code
is_create = True
else:
contract_address = None
data = transaction.data
code = state_db.get_code(transaction.to)
is_create = False
self.logger.info(
("TRANSACTION: to: %s | gas: %s | "
"data-hash: %s | code-hash: %s | salt: %s"),
encode_hex(transaction.to),
transaction.gas,
encode_hex(keccak(transaction.data)),
encode_hex(keccak(transaction.code)),
encode_hex(transaction.salt),
)
message = ShardingMessage(
gas=message_gas,
to=transaction.to,
sender=ENTRY_POINT,
value=0,
data=data,
code=code,
is_create=is_create,
access_list=transaction.prefix_list,
)
transaction_context = self.get_transaction_context_class()(
origin=transaction.to,
sig_hash=transaction.sig_hash,
transaction_gas_limit=transaction.gas,
)
#
# 2) Apply the message to the VM.
#
if message.is_create:
with state_db_cm(read_only=True) as state_db:
is_collision = state_db.account_has_code(contract_address)
# Check if contract address provided by transaction is correct
if contract_address != transaction.to:
computation = self.get_computation(message,
transaction_context)
computation._error = IncorrectContractCreationAddress(
"Contract address calculated: {0} but {1} is provided".
format(
encode_hex(contract_address),
encode_hex(transaction.to),
))
self.logger.debug(
"Contract address calculated: %s but %s is provided",
encode_hex(contract_address),
encode_hex(transaction.to),
)
elif is_collision:
# The address of the newly created contract has collided
# with an existing contract address.
computation = self.get_computation(message,
transaction_context)
computation._error = ContractCreationCollision(
"Address collision while creating contract: {0}".format(
encode_hex(contract_address), ))
self.logger.debug(
"Address collision while creating contract: %s",
encode_hex(contract_address),
)
else:
computation = self.get_computation(
message,
transaction_context,
).apply_create_message()
else:
computation = self.get_computation(
message, transaction_context).apply_message()
#
# 2) Post Computation
#
# Self Destruct Refunds
num_deletions = len(computation.get_accounts_for_deletion())
if num_deletions:
computation.refund_gas(REFUND_SELFDESTRUCT * num_deletions)
# Gas Refunds
transaction_fee, gas_refund_amount = computation.compute_transaction_fee_and_refund(
)
if gas_refund_amount:
self.logger.debug(
'TRANSACTION REFUND: %s -> %s',
gas_refund_amount,
encode_hex(message.to),
)
with state_db_cm() as state_db:
state_db.delta_balance(message.to, gas_refund_amount)
# Miner Fees
self.logger.debug(
'TRANSACTION FEE: %s',
transaction_fee,
)
# Process Self Destructs
with state_db_cm() as state_db:
for account, beneficiary in computation.get_accounts_for_deletion(
):
# TODO: need to figure out how we prevent multiple selfdestructs from
# the same account and if this is the right place to put this.
self.logger.debug('DELETING ACCOUNT: %s', encode_hex(account))
# TODO: this balance setting is likely superflous and can be
# removed since `delete_account` does this.
state_db.set_balance(account, 0)
state_db.delete_account(account)
return computation
