Contract con_uw_auction
| Creator | 554bdec75c364c067e03f9d4113a2dab177f424d45122902a128d9590fba7880 |
| Creation Hash | d4ba594acfc5f4877402f045f07145a301a18132accfa240208d6fd7daf6e188 |
| Created On | 985 days ago - 8/25/2021, 3:31:26 PM UTC+0 |
Contract Code
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import currency
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import con_uwarriors_lst001
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I = importlib
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S = Hash(default_value=None)
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metadata = Hash(default_value=0)
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@construct
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def seed():
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metadata['operator'] = ctx.caller
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# LST002
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@export
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def change_metadata(key: str, value: Any):
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assert ctx.caller == metadata['operator'], 'Only auction operator can set metadata!'
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metadata[key] = value
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@export
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def operator_transfer_thing(uid: str, new_owner: str, contract: str):
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assert ctx.caller == metadata['operator'], 'Only auction operator can transfer things from contract.'
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thing_master_contract = I.import_module(contract)
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thing_master_contract.transfer(uid=uid, new_owner=new_owner)
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S[uid] = False
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@export
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def operator_transfer_currency(amount: str, to: float):
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assert ctx.caller == metadata['operator'], 'Only auction operator can transfer currency from contract.'
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con_uwarriors_lst001.transfer(amount=amount, to=to)
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def get_listing_info(uid: str):
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# Get listing info
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listing_info = S[uid]
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assert listing_info is not None, "Listing doesn't exist!"
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return {
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'start_date': S[uid, 'start_date'],
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'end_date': S[uid, 'end_date'],
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'current_owner': S[uid, 'current_owner'],
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'uid': S[uid, 'uid'],
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'reserve_price': S[uid, 'reserve_price'],
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'current_bid': S[uid, 'current_bid'],
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'current_winner': S[uid, 'current_winner']
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}
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@export
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def auction_thing(contract: str, uid: str, reserve_price: float, start_date: datetime.datetime, end_date: datetime.datetime):
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# transfer thing to this auction contract
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# This will throw an Assertion error if caller does not own the thing and revert the tx
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thing_master_contract = I.import_module(contract)
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thing_master_contract.transfer_from(
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uid=uid,
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to=ctx.this,
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main_account=ctx.caller
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)
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assert not S[uid], 'Auction has already started!'
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assert end_date > now, "end_date is in the past"
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assert reserve_price >= 0, "reserve_price cannot be less than 0"
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S[uid, 'start_date'] = start_date
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S[uid, 'end_date'] = end_date
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S[uid, 'current_owner'] = ctx.caller
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S[uid, 'uid'] = uid
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S[uid, 'reserve_price'] = reserve_price
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S[uid, 'current_bid'] = None
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S[uid, 'current_winner'] = ""
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# Mark as auction started
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S[uid] = True
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@export
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def end_auction(uid: str, end_early: bool, contract: str):
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# Get listing info
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listing_info = get_listing_info(uid=uid)
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if end_early:
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# Only the owner or the operator can end an auction early
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assert listing_info['current_owner'] == ctx.caller or metadata['operator'] == ctx.caller, \
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'Only thing owner or auction operator can end the auction early!'
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if now < listing_info['start_date']:
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process_auction_result_no_winner(listing_info, contract)
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else:
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if (listing_info['current_bid'] or -1) < listing_info['reserve_price']:
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process_auction_result_no_winner(listing_info, contract)
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else:
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assert False, "Cannot end early. Auction started or reserve has been met."
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else:
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# Else, anyone can call this to complete the auction, assuming the auction is over
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assert now > listing_info['end_date'], 'Auction is still pending!'
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if listing_info['current_bid'] == None or listing_info['current_bid'] < listing_info['reserve_price']:
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process_auction_result_no_winner(listing_info, contract)
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else:
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process_auction_result(listing_info, contract)
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def process_auction_result_no_winner(listing_info, contract):
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thing_master_contract = I.import_module(contract)
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# Send thing back to owner
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thing_master_contract.transfer(
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uid=listing_info['uid'],
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new_owner=listing_info['current_owner'],
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contract=contract
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)
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# Send money back to last bidder (if there was one)
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if listing_info['current_winner'] != "":
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con_uwarriors_lst001.transfer(
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to=listing_info['current_winner'],
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amount=listing_info['current_bid']
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)
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S[listing_info['uid']] = False
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def process_auction_result(listing_info, contract):
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thing_master_contract = I.import_module(contract)
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# transfer thing to new owner
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thing_master_contract.transfer(
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uid=listing_info['uid'],
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new_owner=listing_info['current_winner'],
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contract=contract
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)
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net_amount = listing_info['current_bid']
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con_uwarriors_lst001.transfer(
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to=listing_info['current_owner'],
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amount=net_amount
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)
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S[listing_info['uid']] = False
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@export
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def bid(uid: str, bid_amount: float):
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listing_info = get_listing_info(uid=uid)
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current_bid = listing_info['current_bid'] or 0
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assert now < listing_info['end_date'], "Auction has ended."
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assert now > listing_info['start_date'], "Auction has not stared."
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assert bid_amount > 0 , "Bid must be greater than zero."
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assert bid_amount > current_bid, "Current bid of {current_bid} is higher!"
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# Take the currency bid from the bidder
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con_uwarriors_lst001.transfer_from(
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main_account=ctx.caller,
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to=ctx.this,
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amount=bid_amount,
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)
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# Send the previous bidder's bid back to them
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if listing_info['current_winner'] != "":
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con_uwarriors_lst001.transfer(
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to=listing_info['current_winner'],
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amount=listing_info['current_bid']
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)
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# Set the new bid info
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S[uid, 'current_bid'] = bid_amount
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S[uid, 'current_winner'] = ctx.caller
Byte Code
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