def bite(self, ilk_id, urn, now):
# TODO: Remove `now` once better timekeeping solution is implemented
rate = self.vat.ilks[ilk_id].rate
spot = self.vat.ilks[ilk_id].spot
dust = self.vat.ilks[ilk_id].dust
ink = self.vat.urns[ilk_id][urn].ink
art = self.vat.urns[ilk_id][urn].art
require(spot > Ray(0) and Rad(ink * spot) < Rad(art * rate),
"Cat/not-unsafe")
milk = self.ilks[ilk_id]
room = self.box - self.litter
require(self.litter < self.box and room >= dust,
"Cat/liquidation-limit-hit")
dart = Wad.min(art,
Wad(Rad.min(milk.dunk, room)) / Wad(rate) / milk.chop)
dink = Wad.min(ink, ink * dart / art)
require(dart > Wad(0) and dink > Wad(0), "Cat/null-auction")
require(
dart <= Wad.from_number(2**255)
and dink <= Wad.from_number(2**255),
"Cat/overflow",
)
self.vat.grab(ilk_id, urn, self.ADDRESS, self.vow.ADDRESS,
Wad(0) - dink,
Wad(0) - dart)
self.vow.fess(Rad(dart * rate), now)
tab = Rad(dart * rate * milk.chop)
self.litter += tab
milk.flip.kick(urn, self.vow.ADDRESS, tab, dink, Rad(0), now)
def place_bid(self, bid_id, price, ilk_id, now):
if price > Wad(0):
flipper = self.flippers[ilk_id]
bid = flipper.bids[bid_id]
if bid.bid == bid.tab:
# Dent phase
our_lot = Wad(bid.bid / Rad(price))
if (our_lot * flipper.beg <= bid.lot and our_lot < bid.lot
and self.vat.dai.get(self.ADDRESS)
and self.vat.dai[self.ADDRESS] >= bid.bid):
return {
"key": "DENT",
"keeper": self,
"handler": flipper.dent,
"args": [bid_id, self.ADDRESS, our_lot, bid.bid, now],
"kwargs": {},
}
else:
# Tend phase
our_bid = Rad.min(Rad(bid.lot) * price, bid.tab)
if ((our_bid >= bid.bid * flipper.beg or our_bid == bid.tab)
and our_bid > bid.bid
and self.vat.dai.get(self.ADDRESS)
and self.vat.dai[self.ADDRESS] >=
(our_bid if self.ADDRESS != bid.guy else our_bid -
bid.bid)):
return {
"key": "TEND",
"keeper": self,
"handler": flipper.tend,
"args": [bid_id, self.ADDRESS, bid.lot, our_bid, now],
"kwargs": {},
}
return None