def liquidate_urn(cls, web3, mcd, c, gal_address, our_address): # Ensure the CDP isn't safe urn = mcd.vat.urn(c.ilk, gal_address) dart = max_dart(mcd, c, gal_address) - Wad.from_number(1) assert mcd.vat.frob(c.ilk, gal_address, Wad(0), dart).transact(from_address=gal_address) set_collateral_price(mcd, c, Wad.from_number(66)) assert not is_cdp_safe(mcd.vat.ilk(c.ilk.name), urn) # Bite and kick off the auction kick = bite(mcd, c, urn) assert kick > 0 # Bid on and win the auction auction = c.flipper.bids(kick) bid = Wad(auction.tab) + Wad(1) reserve_dai(mcd, c, our_address, bid) c.flipper.approve( mcd.vat.address, approval_function=hope_directly(from_address=our_address)) assert c.flipper.tend(kick, auction.lot, auction.tab).transact(from_address=our_address) time_travel_by(web3, c.flipper.ttl() + 1) assert c.flipper.deal(kick).transact() set_collateral_price(mcd, c, Wad.from_number(200)) urn = mcd.vat.urn(c.ilk, gal_address) assert urn.ink == Wad(0) assert urn.art == Wad(0)
def liquidate_urn(cls, web3, mcd, c, gal_address, our_address): # Ensure the CDP isn't safe urn = mcd.vat.urn(c.ilk, gal_address) dart = max_dart(mcd, c, gal_address) - Wad.from_number(1) assert mcd.vat.frob(c.ilk, gal_address, Wad(0), dart).transact(from_address=gal_address) set_collateral_price(mcd, c, Wad.from_number(66)) assert not is_cdp_safe(mcd.vat.ilk(c.ilk.name), urn) # Determine how many bites will be required dunk = Wad(mcd.cat.dunk(c.ilk)) urn = mcd.vat.urn(c.ilk, gal_address) bites_required = math.ceil(urn.art / dunk) print(f"art={urn.art} and dunk={dunk} so {bites_required} bites are required") c.flipper.approve(mcd.vat.address, approval_function=hope_directly(from_address=our_address)) first_kick = c.flipper.kicks() + 1 # Bite and bid on each auction for i in range(bites_required): kick = bite(mcd, c, urn) assert kick > 0 auction = c.flipper.bids(kick) print(f"biting {i} of {bites_required} and bidding tab of {auction.tab}") bid = Wad(auction.tab) + Wad(1) reserve_dai(mcd, c, our_address, bid) print(f"bidding tab of {auction.tab}") assert c.flipper.tend(kick, auction.lot, auction.tab).transact(from_address=our_address) time_travel_by(web3, c.flipper.ttl()) for kick in range(first_kick, c.flipper.kicks()): assert c.flipper.deal(kick).transact() set_collateral_price(mcd, c, Wad.from_number(200)) urn = mcd.vat.urn(c.ilk, gal_address)