def burn(account: UInt160, amount: int):
"""
Burns zNEO tokens.
:param account: the address of the account that is pulling out cryptocurrency of this contract
:type account: UInt160
:param amount: the amount of gas to be refunded
:type amount: int
:raise AssertionError: raised if `account` length is not 20, amount is less than than 0 or the account doesn't have
enough zNEO to burn
"""
assert len(account) == 20
assert amount >= 0
if runtime.check_witness(account):
if amount != 0:
current_total_supply = total_supply()
account_balance = balance_of(account)
assert account_balance >= amount
storage.put(SUPPLY_KEY, current_total_supply - amount)
if account_balance == amount:
storage.delete(account)
else:
storage.put(account, account_balance - amount)
on_transfer(account, None, amount)
post_transfer(account, None, amount, None, False)
NEO_TOKEN.transfer(runtime.executing_script_hash, account, amount)
def refund(address: UInt160, neo_amount: int, gas_amount: int) -> bool:
"""
Refunds an address with given Neo and Gas
:param address: the address that have the tokens
:type address: UInt160
:param neo_amount: the amount of neo to be refunded
:type neo_amount: int
:param gas_amount: the amount of gas to be refunded
:type gas_amount: int
:return: whether the refund was successful
"""
assert len(address) == 20
assert neo_amount > 0 or gas_amount > 0
if not is_administrator():
return False
if neo_amount > 0:
result = NEO_TOKEN.transfer(runtime.calling_script_hash, address,
neo_amount)
if not result:
# due to a current limitation in the neo3-boa, changing the condition to `not result`
# will result in a compiler error
return False
if gas_amount > 0:
result = GAS_TOKEN.transfer(runtime.calling_script_hash, address,
gas_amount)
if not result:
# due to a current limitation in the neo3-boa, changing the condition to `not result`
# will result in a compiler error
return False
return True
def main(from_address: UInt160, to_address: UInt160) -> int:
return NEO.transfer(from_address, to_address)
def transfer(from_: UInt160, to: UInt160, amount: int) -> bool:
return NEO.transfer(from_, to, amount)
def main(from_address: UInt160, to_address: UInt160, amount: int, data: Any) -> int:
return NEO.transfer(from_address, to_address, amount, data, 'arg')