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Merge pull request #2731 from aeternity/PT-lima-bidding
Pt lima bidding
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| %%%============================================================================= | ||
| %%% @copyright (C) 2018, Aeternity Anstalt | ||
| %%% @doc | ||
| %%% ADT for names auction objects | ||
| %%% Idea: whenever a new claim comes in within auction period, | ||
| %%% then - if namefee too low, just charge for transaction, but not the fee | ||
| %%% - if namefee exceeds previous bid with right margin | ||
| %%% then we end up here and create a new auction object, | ||
| %%% the previous highest bidder should get its namefee unlocked and | ||
| %%% the new one get it locked. | ||
| %%% Invariant: we can only start claiming names when name is not claimed | ||
| %%% hence, we cannot start an auction before the name is available | ||
| %%% We delete all auction objects after the auction, therefore no | ||
| %%% risk ??? that previous name holder get returned name fee when new auction starts. | ||
| %%% @end | ||
| %%%============================================================================= | ||
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| -module(aens_auctions). | ||
|
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||
| %% API | ||
| -export([new/5, | ||
| serialize/1, | ||
| deserialize/2, | ||
| deserialize_from_fields/3, | ||
| serialization_type/0, | ||
| serialization_template/1 | ||
| ]). | ||
|
|
||
| %% Getters | ||
| -export([hash/1, | ||
| bidder_pubkey/1, | ||
| ttl/1, | ||
| name_fee/1, | ||
| started/1]). | ||
|
|
||
| -behavior(aens_cache). | ||
| %%%=================================================================== | ||
| %%% Types | ||
| %%%=================================================================== | ||
| -record(auction, | ||
| {id :: aeser_id:id(), | ||
| started :: aec_blocks:height(), | ||
| bidder_id :: aeser_id:id(), %% should there be a preclaim for second bidder?? No. | ||
| %% Preclaim owner can start auction by a claim, nobody else | ||
| %% Having a second preclaim for same name won't restart auction | ||
| bid :: non_neg_integer(), %% the name_fee provided | ||
| ttl :: aec_blocks:height() | ||
| }). | ||
|
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||
| -opaque auction() :: #auction{}. | ||
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| -type id() :: aeser_id:id(). | ||
| -type pubkey() :: aec_keys:pubkey(). | ||
| -type serialized() :: binary(). | ||
|
|
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| -export_type([id/0, | ||
| auction/0, | ||
| serialized/0]). | ||
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| -define(AUCTION_TYPE, name_auction). | ||
| -define(AUCTION_VSN, 1). | ||
|
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| %%%=================================================================== | ||
| %%% API | ||
| %%%=================================================================== | ||
|
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| -spec new(aens_hash:auction_hash(), aec_keys:pubkey(), non_neg_integer(), | ||
| non_neg_integer(), aec_blocks:height()) -> auction(). | ||
| new(AuctionHash, Bidder, NameFee, DeltaTTL, BlockHeight) -> | ||
| NameHash = aens_hash:from_auction_hash(AuctionHash), | ||
| #auction{id = aeser_id:create(name, NameHash), | ||
| bidder_id = aeser_id:create(account, Bidder), | ||
| started = BlockHeight, | ||
| bid = NameFee, | ||
| ttl = BlockHeight + DeltaTTL}. | ||
|
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| -spec serialize(auction()) -> serialized(). | ||
| serialize(#auction{bidder_id = BidderId, | ||
| bid = NameFee, | ||
| started = Started, | ||
| ttl = TTL}) -> | ||
| aeser_chain_objects:serialize( | ||
| ?AUCTION_TYPE, | ||
| ?AUCTION_VSN, | ||
| serialization_template(?AUCTION_VSN), | ||
| [ {bidder_id, BidderId} | ||
| , {bid, NameFee} | ||
| , {started, Started} | ||
| , {ttl, TTL}]). | ||
|
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| -spec deserialize(aens_hash:auction_hash(), binary()) -> auction(). | ||
| deserialize(AuctionHash, Bin) -> | ||
| NameHash = aens_hash:from_auction_hash(AuctionHash), | ||
| Fields = aeser_chain_objects:deserialize( | ||
| ?AUCTION_TYPE, | ||
| ?AUCTION_VSN, | ||
| serialization_template(?AUCTION_VSN), | ||
| Bin), | ||
| deserialize_from_fields(?AUCTION_VSN, NameHash, Fields). | ||
|
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| deserialize_from_fields(?AUCTION_VSN, NameHash, | ||
| [ {bidder_id, BidderId} | ||
| , {bid, NameFee} | ||
| , {started, Started} | ||
| , {ttl, TTL} ]) -> | ||
| #auction{id = aeser_id:create(name, NameHash), | ||
| bidder_id = BidderId, | ||
| bid = NameFee, | ||
| started = Started, | ||
| ttl = TTL}. | ||
|
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| serialization_template(?AUCTION_VSN) -> | ||
| [ {bidder_id, id} | ||
| , {bid, int} | ||
| , {started, int} | ||
| , {ttl, int}]. | ||
|
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| serialization_type() -> ?AUCTION_TYPE. | ||
| %%%=================================================================== | ||
| %%% Getters | ||
| %%%=================================================================== | ||
|
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| -spec hash(auction()) -> aens_hash:auction_hash(). | ||
| hash(#auction{id = Id}) -> | ||
| NameHash = aeser_id:specialize(Id, name), | ||
| aens_hash:to_auction_hash(NameHash). | ||
|
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| -spec bidder_pubkey(auction()) -> pubkey(). | ||
| bidder_pubkey(#auction{bidder_id = BidderId}) -> | ||
| aeser_id:specialize(BidderId, account). | ||
|
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| -spec name_fee(auction()) -> non_neg_integer(). | ||
| name_fee(#auction{bid = NameFee}) -> | ||
| NameFee. | ||
|
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| -spec ttl(auction()) -> aec_blocks:height(). | ||
| ttl(#auction{ttl = TTL}) -> | ||
| TTL. | ||
|
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| -spec started(auction()) -> aec_blocks:height(). | ||
| started(#auction{started = Started}) -> | ||
| Started. |
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