def bustable_amount_in_sai(self, tap: Tap):
#TODO we always try to bust 10 SAI less than what the Tub reports
#in order to discount the growth of `joy()` that might've have happened since the last drip
#of course this is not the right solution and it won't even work properly if the last
#drip happened enough time ago
bustable_woe = tap.woe() - tap.joy() - Wad.from_number(10)
# we deduct 0.000001 in order to avoid rounding errors
bustable_fog = tap.fog() * tap.ask() - Wad.from_number(0.000001)
return Wad.max(bustable_woe, bustable_fog, Wad.from_number(0))
def __init__(self, tub: Tub, tap: Tap):
self.tub = tub
self.tap = tap
super().__init__(source_token=self.tub.sai(),
target_token=self.tub.skr(),
rate=(Ray.from_number(1) / Ray(tap.ask())),
max_source_amount=self.bustable_amount_in_sai(tap),
method="tub.bust()")
def __init__(self, tub: Tub, tap: Tap):
self.tub = tub
self.tap = tap
super().__init__(source_token=self.tub.skr(),
target_token=self.tub.sai(),
rate=Ray(tap.bid()),
max_source_amount=self.boomable_amount_in_skr(tap),
method="tub.boom()")
def new_sai() -> SaiDeployment:
def deploy(web3, contract_name, args=None):
contract_factory = web3.eth.contract(
abi=json.loads(
pkg_resources.resource_string('keeper.api.feed',
f'abi/{contract_name}.abi')),
bytecode=pkg_resources.resource_string('keeper.api.feed',
f'abi/{contract_name}.bin'))
tx_hash = contract_factory.deploy(args=args)
receipt = web3.eth.getTransactionReceipt(tx_hash)
return receipt['contractAddress']
web3 = Web3(EthereumTesterProvider())
web3.eth.defaultAccount = web3.eth.accounts[0]
our_address = Address(web3.eth.defaultAccount)
sai = DSToken.deploy(web3, 'SAI')
sin = DSToken.deploy(web3, 'SIN')
gem = DSToken.deploy(web3, 'ETH')
pip = DSValue.deploy(web3)
skr = DSToken.deploy(web3, 'SKR')
pot = DSVault.deploy(web3)
pit = DSVault.deploy(web3)
tip = deploy(web3, 'Tip')
dad = DSGuard.deploy(web3)
jug = deploy(web3, 'SaiJug', [sai.address.address, sin.address.address])
jar = deploy(
web3, 'SaiJar',
[skr.address.address, gem.address.address, pip.address.address])
tub = Tub.deploy(web3, Address(jar), Address(jug), pot.address,
pit.address, Address(tip))
tap = Tap.deploy(web3, tub.address, pit.address)
top = Top.deploy(web3, tub.address, tap.address)
# set permissions
dad.permit(DSGuard.ANY, DSGuard.ANY, DSGuard.ANY).transact()
tub.set_authority(dad.address)
for auth in [sai, sin, skr, pot, pit, tap, top]:
auth.set_authority(dad.address).transact()
# approve, mint some GEMs
tub.approve(directly())
gem.mint(Wad.from_number(1000000)).transact()
web3.currentProvider.rpc_methods.evm_snapshot()
return SaiDeployment(web3, our_address, gem, sai, sin, skr, tub, tap, top)
def __init__(self):
super().__init__()
self.tub_address = Address(self.config.get_contract_address("saiTub"))
self.tub = Tub(web3=self.web3, address=self.tub_address)
self.tap_address = Address(self.config.get_contract_address("saiTap"))
self.tap = Tap(web3=self.web3, address=self.tap_address)
self.top_address = Address(self.config.get_contract_address("saiTop"))
self.top = Top(web3=self.web3, address=self.top_address)
self.otc_address = Address(self.config.get_contract_address("otc"))
self.otc = SimpleMarket(web3=self.web3, address=self.otc_address)
self.skr = ERC20Token(web3=self.web3, address=self.tub.skr())
self.sai = ERC20Token(web3=self.web3, address=self.tub.sai())
self.gem = DSEthToken(web3=self.web3, address=self.tub.gem())
ERC20Token.register_token(self.tub.skr(), 'SKR')
ERC20Token.register_token(self.tub.sai(), 'SAI')
ERC20Token.register_token(self.tub.gem(), 'WETH')
def boomable_amount_in_skr(self, tap: Tap):
# we deduct 0.000001 in order to avoid rounding errors
return Wad.max(
Wad(self.boomable_amount_in_sai(tap) / (tap.bid())) -
Wad.from_number(0.000001), Wad.from_number(0))
def boomable_amount_in_sai(self, tap: Tap):
return Wad.max(tap.joy() - tap.woe(), Wad.from_number(0))