def paygas(computation):
gas_price = computation.stack_pop(type_hint=constants.UINT256)
# Only valid if (1) triggered in a top level call and
# (2) not been set already during this transaction execution
try:
computation.set_PAYGAS_gasprice(gas_price)
except (GasPriceAlreadySet, NotTopLevelCall):
computation.stack_push(0)
else:
with computation.state_db(read_only=False) as state_db:
tx_initiator = computation.msg.to
tx_initiator_balance = state_db.get_balance(tx_initiator)
PAYGAS_gasprice = computation.get_PAYGAS_gas_price()
if PAYGAS_gasprice is None:
PAYGAS_gasprice = 0
fee_to_be_charged = (
PAYGAS_gasprice *
computation.transaction_context.transaction_gas_limit)
if tx_initiator_balance < fee_to_be_charged:
raise InsufficientFunds("Insufficient funds: {0} < {1}".format(
tx_initiator_balance, fee_to_be_charged))
state_db.delta_balance(tx_initiator, -1 * fee_to_be_charged)
computation.stack_push(1)
def _apply_frontier_message(vm, message):
snapshot = vm.snapshot()
if message.depth > constants.STACK_DEPTH_LIMIT:
raise StackDepthLimit("Stack depth limit reached")
if message.should_transfer_value and message.value:
with vm.state_db() as state_db:
sender_balance = state_db.get_balance(message.sender)
if sender_balance < message.value:
raise InsufficientFunds("Insufficient funds: {0} < {1}".format(
sender_balance, message.value))
state_db.delta_balance(message.sender, -1 * message.value)
state_db.delta_balance(message.storage_address, message.value)
vm.logger.debug(
"TRANSFERRED: %s from %s -> %s",
message.value,
encode_hex(message.sender),
encode_hex(message.storage_address),
)
with vm.state_db() as state_db:
state_db.touch_account(message.storage_address)
computation = vm.apply_computation(message)
if computation.error:
vm.revert(snapshot)
else:
vm.commit(snapshot)
return computation
def apply_message(self):
snapshot = self.vm_state.snapshot()
if self.msg.depth > constants.STACK_DEPTH_LIMIT:
raise StackDepthLimit("Stack depth limit reached")
if self.msg.should_transfer_value and self.msg.value:
with self.vm_state.state_db() as state_db:
sender_balance = state_db.get_balance(self.msg.sender)
if sender_balance < self.msg.value:
raise InsufficientFunds(
"Insufficient funds: {0} < {1}".format(
sender_balance, self.msg.value))
state_db.delta_balance(self.msg.sender, -1 * self.msg.value)
state_db.delta_balance(self.msg.storage_address,
self.msg.value)
self.logger.debug(
"TRANSFERRED: %s from %s -> %s",
self.msg.value,
encode_hex(self.msg.sender),
encode_hex(self.msg.storage_address),
)
with self.vm_state.state_db() as state_db:
state_db.touch_account(self.msg.storage_address)
computation = self.apply_computation(
self.vm_state,
self.msg,
self.opcodes,
self.precompiles,
)
if computation.is_error:
self.vm_state.revert(snapshot)
else:
self.vm_state.commit(snapshot)
return computation
def _apply_message(evm, message):
snapshot = evm.snapshot()
if message.depth > constants.STACK_DEPTH_LIMIT:
raise StackDepthLimit("Stack depth limit reached")
if message.should_transfer_value and message.value:
sender_balance = evm.block.state_db.get_balance(message.sender)
if sender_balance < message.value:
raise InsufficientFunds(
"Insufficient funds: {0} < {1}".format(sender_balance, message.value)
)
sender_balance -= message.value
evm.block.state_db.set_balance(message.sender, sender_balance)
recipient_balance = evm.block.state_db.get_balance(message.storage_address)
recipient_balance += message.value
evm.block.state_db.set_balance(message.storage_address, recipient_balance)
if evm.logger is not None:
evm.logger.debug(
"TRANSFERRED: %s from %s -> %s",
message.value,
encode_hex(message.sender),
encode_hex(message.storage_address),
)
if not evm.block.state_db.account_exists(message.storage_address):
evm.block.state_db.touch_account(message.storage_address)
computation = evm.apply_computation(message)
if computation.error:
evm.revert(snapshot)
return computation
