| code |
balances = Hash(default_value=0)
metadata = Hash()
operator = Variable()
total_supply = Variable()
@construct
def seed(owner: str):
total_supply.set(0)
operator.set(owner)
metadata['token_name'] = 'RubixDAO'
metadata['token_symbol'] = 'lMKR'
metadata['token_logo_url'] = 'image.site'
metadata['operator'] = ctx.caller
@export
def transfer(amount: float, to: str):
assert amount > 0, 'Cannot send negative balances!'
sender = ctx.caller
assert balances[sender] >= amount, 'Not enough coins to send!'
balances[sender] -= amount
balances[to] += amount
@export
def balance_of(account: str):
return balances[account]
@export
def allowance(owner: str, spender: str):
return balances[owner, spender]
@export
def approve(amount: float, to: str):
assert amount > 0, 'Cannot send negative balances!'
sender = ctx.caller
balances[sender, to] += amount
return balances[sender, to]
@export
def transfer_from(amount: float, to: str, main_account: str):
assert amount > 0, 'Cannot send negative balances!'
sender = ctx.caller
assert balances[main_account] >= amount, 'Not enough coins to send!'
assert balances[main_account, sender] >= amount, 'Not enough coins approved to send! You have {} and are trying to spend {}'\
.format(balances[main_account, sender], amount)
balances[main_account, sender] -= amount
balances[main_account] -= amount
balances[to] += amount
@export
def mint(amount: float):
assert_owner()
assert amount > 0, 'Cannot mint negative balances!'
sender = ctx.caller
balances[sender] += amount
total = total_supply.get() + amount
total_supply.set(total)
@export
def burn(amount: float):
assert amount > 0, 'Cannot burn negative balances!'
sender = ctx.caller
assert balances[sender] >= amount, 'Not enough coins to burn!'
balances[sender] -= amount
total = total_supply.get() - amount
total_supply.set(total)
@export
def get_total_supply():
return total_supply.get()
@export
def change_metadata(key: str, value: Any):
assert ctx.caller == metadata['operator'], 'Only operator can set metadata!'
metadata[key] = value
@export
def change_owner(new_owner: str):
assert_owner()
operator.set(new_owner)
def assert_owner():
assert ctx.caller == operator.get(), 'Only operator can call!'
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