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course08_transfer_ONT&ONG_in_smart_contract.md

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How to Transfer ONT/ONG in Smart Contract

Version 0.1

1. Introduction

API Return Value Description
Invoke byte[] Invoke a native contract
state string Build transfer structure

For more details, you can view the API-doc and the source code here.

Native contract

Contract name Contract Address
ONT Token 0000000000000000000000000000000000000001
ONG Token 0000000000000000000000000000000000000002
ONT ID 0000000000000000000000000000000000000003
Global Params 0000000000000000000000000000000000000004
Oracle 0000000000000000000000000000000000000005
Authorization Manager(Auth) 0000000000000000000000000000000000000006
Governance 0000000000000000000000000000000000000007
DDXF(Decentralized Exchange) 0000000000000000000000000000000000000008

2. Transfer ONT/ONG

state is used for building transfer structure.

Invoke is used for invoke native contract.

from ontology.interop.System.Runtime import Notify, CheckWitness
from ontology.interop.Ontology.Runtime import Base58ToAddress
from ontology.interop.Ontology.Native import Invoke
from ontology.builtins import state

# contract address 
contract_address_ONT = bytearray(b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01')
contract_address_ONG = bytearray(b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02')

def Main(operation, args):
    if operation == 'transfer':
        from_acct = args[0]
        to_acct = args[1]
        ont_amount = args[2]
        ong_amount = args[3]
        return transfer(from_acct,to_acct,ont_amount,ong_amount)
    
    return False


def transfer(from_acct, to_acct, ont_amount, ong_amount):
    # convert base58 address to address in the form of byte array 
    from_acct=Base58ToAddress(from_acct)
    to_acct=Base58ToAddress(to_acct)
    # check whether the sender is the payer
    if CheckWitness(from_acct):
        # transfer ONT
        if ont_amount > 0:
            param = state(from_acct, to_acct, ont_amount)
            res = Invoke(1, contract_address_ONT, 'transfer', [param])
            if res and res == b'\x01':
                Notify('transfer succeed')
            else:
                Notify('transfer failed')
        # transfer ONG
        if ong_amount > 0:
            param = state(from_acct, to_acct, ong_amount)
            res = Invoke(1, contract_address_ONG, 'transfer', [param])
            if res and res == b'\x01':
                Notify('transfer succeed')
            else:
                Notify('transfer failed')
    else:
        Notify('CheckWitness failed')

3. Transfer ONG to self contract

from ontology.interop.System.Runtime import Notify, CheckWitness
from ontology.interop.Ontology.Runtime import Base58ToAddress
from ontology.interop.Ontology.Native import Invoke
from ontology.builtins import state, bytearray
from ontology.interop.System.ExecutionEngine import GetExecutingScriptHash

# contract address 
contract_address_ONT = bytearray(b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01')
contract_address_ONG = bytearray(b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02')
self_contract_address = GetExecutingScriptHash()

def Main(operation, args):
    if operation == 'transfer_ONG_to_contract':
        from_acct = args[0]
        ong_amount = args[1]
        return transfer_ONG_to_contract(from_acct, ong_amount)
    if operation == 'check_self_contract_ONG_amount':
        return check_self_contract_ONG_amount()
    return False


def transfer_ONG_to_contract(from_acct, ong_amount):
    # convert base58 address to address in the form of byte array 
    from_acct=Base58ToAddress(from_acct)
    param = state(from_acct, self_contract_address, ong_amount)
    res = Invoke(0, contract_address_ONG, 'transfer', [param])
    if res and res == b'\x01':
        Notify('transfer ONG to contract successfully')
    else:
        Notify('transfer ONG failed')
        
        
def check_self_contract_ONG_amount():
    param = state(self_contract_address)
    # do not use [param]
    res = Invoke(0, contract_address_ONG, 'balanceOf', param)
    return res

4. Contributing

Please feel free to give any suggestion and help us make video better!
Contact: Yue Zhao 
Wechat: 16621171248
Email: messixaviinsta0303@163.com