State

Parameters and genesis state

Paramaters 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.

// Params governance parameters for auction module
type Params struct {
	MaxAuctionDuration time.Duration `json:"max_auction_duration" yaml:"max_auction_duration"` // max length of auction
	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.
}

GenesisState defines the state that must be persisted when the blockchain stops/restarts in order for normal function of the auction module to resume.

// GenesisState - auction state that must be provided at genesis
type GenesisState struct {
	NextAuctionID uint64          `json:"next_auction_id" yaml:"next_auction_id"` // auctionID that will be used for the next created auction
	Params        Params          `json:"auction_params" yaml:"auction_params"` // auction params
	Auctions      Auctions `json:"genesis_auctions" yaml:"genesis_auctions"` // auctions currently in the store
}

Base types

// Auction is an interface to several types of auction.
type Auction interface {
	GetID() uint64
	WithID(uint64) Auction
	GetBidder() sdk.AccAddress
	GetBid() sdk.Coin
	GetLot() sdk.Coin
	GetEndTime() time.Time
}

// BaseAuction type shared by all Auctions
type BaseAuction struct {
	ID         uint64
	Initiator  string         // Module that starts the auction. Giving away Lot (aka seller in a forward auction). Restricted to being a module account name rather than any account.
	Lot        sdk.Coin       // Amount of coins up being given by initiator (FA - amount for sale by seller, RA - cost of good by buyer (bid))
	Bidder     sdk.AccAddress // Person who bids in the auction. Receiver of Lot. (aka buyer in forward auction, seller in RA)
	Bid        sdk.Coin       // Amount of coins being given by the bidder (FA - bid, RA - amount being sold)
	EndTime    time.Time      // Auction closing time. Triggers at the end of the block with time ≥ endTime (bids placed in that block are valid) // TODO ensure everything is consistent with this
	MaxEndTime time.Time      // Maximum closing time. Auctions can close before this but never after.
}

// ForwardAuction type for forward auctions
type ForwardAuction struct {
	BaseAuction
}

// ReverseAuction type for reverse auctions
type ReverseAuction struct {
	BaseAuction
}

// WeightedAddresses type for storing an address and its associated weight
type WeightedAddresses struct {
	Addresses []sdk.AccAddress
	Weights   []sdk.Int
}

// ForwardReverseAuction type for forward reverse auction
type ForwardReverseAuction struct {
	BaseAuction
	MaxBid     sdk.Coin
	LotReturns WeightedAddresses // return addresses to pay out reductions in the lot amount to. Lot is bid down during reverse phase.
}

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State

Parameters and genesis state

Base types

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