0g-chain/x/auction/spec/02_state.md

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# 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.
```go
// 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.
```go
// 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
```go
// Auction is an interface to several types of auction.
type Auction interface {
GetID() uint64
WithID(uint64) Auction
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.
}
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// SurplusAuction type for forward auctions
type SurplusAuction struct {
BaseAuction
}
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// DebtAuction type for reverse auctions
type DebtAuction struct {
BaseAuction
}
// WeightedAddresses type for storing an address and its associated weight
type WeightedAddresses struct {
Addresses []sdk.AccAddress
Weights []sdk.Int
}
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// CollateralAuction type for forward reverse auction
type CollateralAuction 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.
}
```