def new_transfer_tx(self, from_address: Union[str, Address], to_address: Union[str, Address], amount: int,
payer: Union[str, Address], gas_price: int, gas_limit: int) -> InvokeTransaction:
"""
This interface is used to generate a transaction which can transfer amount of tokens to to_address.
"""
func = InvokeFunction('transfer')
func.set_params_value(Address.b58decode(from_address), Address.b58decode(to_address), amount)
params = InvokeTransaction.generate_invoke_code(self._contract_address, func)
tx = InvokeTransaction(payer, gas_price, gas_limit, params)
return tx
def new_approve_tx(self, owner: Union[str, bytes, Address], spender: Union[str, bytes, Address], amount: int,
payer: Union[str, bytes, Address], gas_price: int, gas_limit: int) -> InvokeTransaction:
"""
This interface is used to generate a transaction which allows spender to
withdraw from owner account multiple times, up to the _value amount.
If this function is called again it overwrites the current allowance with amount value.
"""
if not isinstance(amount, int):
raise SDKException(ErrorCode.param_err('the data type of amount should be int.'))
if amount < 0:
raise SDKException(ErrorCode.param_err('the amount should be equal or great than 0.'))
func = InvokeFunction('approve')
func.set_params_value(Address.b58decode(owner), Address.b58decode(spender), amount)
params = InvokeTransaction.generate_invoke_code(self._contract_address, func)
tx = InvokeTransaction(payer, gas_price, gas_limit, params)
return tx
def new_transfer_multi_tx(self, transfer_list: list, payer: Union[str, bytes, Address], gas_price: int,
gas_limit: int) -> InvokeTransaction:
"""
This interface is used to generate a transaction which can
transfer amount of token from from-account to to-account multiple times.
"""
func = InvokeFunction('transferMulti')
for index, item in enumerate(transfer_list):
if not isinstance(item[2], int):
raise SDKException(ErrorCode.param_err('the data type of value should be int.'))
if item[2] < 0:
raise SDKException(ErrorCode.param_err('the value should be equal or great than 0.'))
transfer_list[index] = [Address.b58decode(item[0]), Address.b58decode(item[1]), item[2]]
for item in transfer_list:
func.add_params_value(item)
params = InvokeTransaction.generate_invoke_code(self._contract_address, func)
tx = InvokeTransaction(payer, gas_price, gas_limit, params)
return tx
