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83 lines
3.6 KiB
Markdown
83 lines
3.6 KiB
Markdown
<!--
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order: 2
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-->
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# State
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## Parameters and genesis state
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`parameters` define the rules according to which auctions are run. There is only one active parameter set at any given time. Updates to the parameter set can be made via on-chain parameter update proposals.
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```go
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// Params governance parameters for auction module
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type Params struct {
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MaxAuctionDuration time.Duration `json:"max_auction_duration" yaml:"max_auction_duration"` // max length of auction
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MaxBidDuration time.Duration `json:"max_bid_duration" yaml:"max_bid_duration"` // additional time added to the auction end time after each bid, capped by the expiry.
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IncrementSurplus sdk.Dec `json:"increment_surplus" yaml:"increment_surplus"` // percentage change (of auc.Bid) required for a new bid on a surplus auction
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IncrementDebt sdk.Dec `json:"increment_debt" yaml:"increment_debt"` // percentage change (of auc.Lot) required for a new bid on a debt auction
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IncrementCollateral sdk.Dec `json:"increment_collateral" yaml:"increment_collateral"` // percentage change (of auc.Bid or auc.Lot) required for a new bid on a collateral auction
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}
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```
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`GenesisState` defines the state that must be persisted when the blockchain stops/restarts in order for normal function of the auction module to resume.
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```go
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// GenesisState - auction state that must be provided at genesis
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type GenesisState struct {
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NextAuctionID uint64 `json:"next_auction_id" yaml:"next_auction_id"` // auctionID that will be used for the next created auction
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Params Params `json:"auction_params" yaml:"auction_params"` // auction params
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Auctions Auctions `json:"genesis_auctions" yaml:"genesis_auctions"` // auctions currently in the store
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}
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```
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## Base types
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```go
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// Auction is an interface to several types of auction.
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type Auction interface {
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GetID() uint64
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WithID(uint64) Auction
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GetEndTime() time.Time
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}
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// BaseAuction is a common type shared by all Auctions.
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type BaseAuction struct {
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ID uint64
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Initiator string // Module name that starts the auction. Pays out Lot.
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Lot sdk.Coin // Coins that will paid out by Initiator to the winning bidder.
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Bidder sdk.AccAddress // Latest bidder. Receiver of Lot.
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Bid sdk.Coin // Coins paid into the auction the bidder.
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EndTime time.Time // Current auction closing time. Triggers at the end of the block with time ≥ EndTime.
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MaxEndTime time.Time // Maximum closing time. Auctions can close before this but never after.
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}
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// SurplusAuction is a forward auction that burns what it receives from bids.
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// It is normally used to sell off excess pegged asset acquired by the CDP system.
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type SurplusAuction struct {
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BaseAuction
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}
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// DebtAuction is a reverse auction that mints what it pays out.
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// It is normally used to acquire pegged asset to cover the CDP system's debts that were not covered by selling collateral.
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type DebtAuction struct {
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BaseAuction
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}
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// WeightedAddresses is a type for storing some addresses and associated weights.
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type WeightedAddresses struct {
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Addresses []sdk.AccAddress
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Weights []sdkmath.Int
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}
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// CollateralAuction is a two phase auction.
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// Initially, in forward auction phase, bids can be placed up to a max bid.
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// Then it switches to a reverse auction phase, where the initial amount up for auction is bid down.
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// Unsold Lot is sent to LotReturns, being divided among the addresses by weight.
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// Collateral auctions are normally used to sell off collateral seized from CDPs.
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type CollateralAuction struct {
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BaseAuction
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MaxBid sdk.Coin
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LotReturns WeightedAddresses
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}
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```
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