def sstore_eip2200(computation: BaseComputation) -> None:
gas_remaining = computation.get_gas_remaining()
if gas_remaining <= 2300:
raise OutOfGas(
"Net-metered SSTORE always fails below 2300 gas, per EIP-2200",
gas_remaining,
)
else:
return net_sstore(GAS_SCHEDULE_EIP2200, computation)
def compute_eip150_msg_gas(*, computation: ComputationAPI, gas: int,
extra_gas: int, value: int, mnemonic: str,
callstipend: int) -> Tuple[int, int]:
if computation.get_gas_remaining() < extra_gas:
# It feels wrong to raise an OutOfGas exception outside of GasMeter,
# but I don't see an easy way around it.
raise OutOfGas(f"Out of gas: Needed {extra_gas}"
f" - Remaining {computation.get_gas_remaining()}"
f" - Reason: {mnemonic}")
gas = min(
gas, max_child_gas_eip150(computation.get_gas_remaining() - extra_gas))
total_fee = gas + extra_gas
child_msg_gas = gas + (callstipend if value else 0)
return child_msg_gas, total_fee
def apply_create_message(self):
snapshot = self.state.snapshot()
# EIP161 nonce incrementation
self.state.account_db.increment_nonce(self.msg.storage_address)
computation = self.apply_message()
if computation.is_error:
self.state.revert(snapshot)
return computation
else:
contract_code = computation.output
if contract_code and len(contract_code) >= EIP170_CODE_SIZE_LIMIT:
computation._error = OutOfGas(
"Contract code size exceeds EIP170 limit of {0}. Got code of "
"size: {1}".format(
EIP170_CODE_SIZE_LIMIT,
len(contract_code),
))
self.state.revert(snapshot)
elif contract_code:
contract_code_gas_cost = len(
contract_code) * constants.GAS_CODEDEPOSIT
try:
computation.consume_gas(
contract_code_gas_cost,
reason="Write contract code for CREATE",
)
except OutOfGas as err:
# Different from Frontier: reverts state on gas failure while
# writing contract code.
computation._error = err
self.state.revert(snapshot)
else:
if self.logger:
self.logger.trace(
"SETTING CODE: %s -> length: %s | hash: %s",
encode_hex(self.msg.storage_address),
len(contract_code),
encode_hex(keccak(contract_code)))
self.state.account_db.set_code(self.msg.storage_address,
contract_code)
self.state.commit(snapshot)
else:
self.state.commit(snapshot)
return computation
def apply_create_message(
cls, state: StateAPI, message: MessageAPI,
transaction_context: TransactionContextAPI) -> ComputationAPI:
snapshot = state.snapshot()
# EIP161 nonce incrementation
state.increment_nonce(message.storage_address)
computation = cls.apply_message(state, message, transaction_context)
if computation.is_error:
state.revert(snapshot)
return computation
else:
contract_code = computation.output
if contract_code and len(contract_code) >= EIP170_CODE_SIZE_LIMIT:
computation.error = OutOfGas(
f"Contract code size exceeds EIP170 limit of {EIP170_CODE_SIZE_LIMIT}."
f" Got code of size: {len(contract_code)}")
state.revert(snapshot)
elif contract_code:
contract_code_gas_cost = len(
contract_code) * constants.GAS_CODEDEPOSIT
try:
computation.consume_gas(
contract_code_gas_cost,
reason="Write contract code for CREATE",
)
except OutOfGas as err:
# Different from Frontier: reverts state on gas failure while
# writing contract code.
computation.error = err
state.revert(snapshot)
else:
if cls.logger:
cls.logger.debug2(
"SETTING CODE: %s -> length: %s | hash: %s",
encode_hex(message.storage_address),
len(contract_code),
encode_hex(keccak(contract_code)))
state.set_code(message.storage_address, contract_code)
state.commit(snapshot)
else:
state.commit(snapshot)
return computation
def compute_eip150_msg_gas(computation, gas, extra_gas, value, mnemonic,
callstipend):
if computation.get_gas_remaining() < extra_gas:
# It feels wrong to raise an OutOfGas exception outside of GasMeter,
# but I don't see an easy way around it.
raise OutOfGas(
"Out of gas: Needed {0} - Remaining {1} - Reason: {2}".format(
extra_gas,
computation.get_gas_remaining(),
mnemonic,
))
gas = min(
gas, max_child_gas_eip150(computation.get_gas_remaining() - extra_gas))
total_fee = gas + extra_gas
child_msg_gas = gas + (callstipend if value else 0)
return child_msg_gas, total_fee
def consume_gas(self, amount: int, reason: str) -> None:
if amount < 0:
raise ValidationError("Gas consumption amount must be positive")
if amount > self.gas_remaining:
raise OutOfGas(f"Out of gas: Needed {amount} "
f"- Remaining {self.gas_remaining} "
f"- Reason: {reason}")
self.gas_remaining -= amount
if self.logger.show_debug2:
self.logger.debug2(
'GAS CONSUMPTION: %s - %s -> %s (%s)',
self.gas_remaining + amount,
amount,
self.gas_remaining,
reason,
)
def consume_gas(self, amount: int, reason: str) -> None:
if amount < 0:
raise ValidationError("Gas consumption amount must be positive")
if amount > self.gas_remaining:
raise OutOfGas("Out of gas: Needed {0} - Remaining {1} - Reason: {2}".format(
amount,
self.gas_remaining,
reason,
))
self.gas_remaining -= amount
self.logger.trace(
'GAS CONSUMPTION: %s - %s -> %s (%s)',
self.gas_remaining + amount,
amount,
self.gas_remaining,
reason,
)
def validate_contract_code(cls, contract_code: bytes) -> None:
if len(contract_code) >= EIP170_CODE_SIZE_LIMIT:
raise OutOfGas(
f"Contract code size exceeds EIP170 limit of {EIP170_CODE_SIZE_LIMIT}."
f" Got code of size: {len(contract_code)}")
