0g-chain/x/auction/keeper/keeper.go
2020-01-01 14:11:19 +00:00

170 lines
5.8 KiB
Go

package keeper
import (
"time"
"github.com/cosmos/cosmos-sdk/codec"
"github.com/cosmos/cosmos-sdk/store/prefix"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/x/params/subspace"
"github.com/kava-labs/kava/x/auction/types"
)
type Keeper struct {
supplyKeeper types.SupplyKeeper
storeKey sdk.StoreKey
cdc *codec.Codec
paramSubspace subspace.Subspace
// TODO codespace
}
// NewKeeper returns a new auction keeper.
func NewKeeper(cdc *codec.Codec, storeKey sdk.StoreKey, supplyKeeper types.SupplyKeeper, paramstore subspace.Subspace) Keeper {
return Keeper{
supplyKeeper: supplyKeeper,
storeKey: storeKey,
cdc: cdc,
paramSubspace: paramstore.WithKeyTable(types.ParamKeyTable()),
}
}
// SetNextAuctionID stores an ID to be used for the next created auction
func (k Keeper) SetNextAuctionID(ctx sdk.Context, id uint64) {
store := ctx.KVStore(k.storeKey)
store.Set(types.NextAuctionIDKey, types.Uint64ToBytes(id))
}
// GetNextAuctionID reads the next available global ID from store
// TODO might be nicer to convert not found error to a panic, it's not an error that can be recovered from
func (k Keeper) GetNextAuctionID(ctx sdk.Context) (uint64, sdk.Error) {
store := ctx.KVStore(k.storeKey)
bz := store.Get(types.NextAuctionIDKey)
if bz == nil {
//return 0, types.ErrInvalidGenesis(k.codespace, "initial auction ID hasn't been set") // TODO create error
return 0, sdk.ErrInternal("initial auction ID hasn't been set")
}
return types.Uint64FromBytes(bz), nil
}
// incrementNextAuctionID increments the global ID in the store by 1
func (k Keeper) IncrementNextAuctionID(ctx sdk.Context) sdk.Error {
id, err := k.GetNextAuctionID(ctx)
if err != nil {
return err
}
k.SetNextAuctionID(ctx, id+1)
return nil
}
// StoreNewAuction stores an auction, adding a new ID
func (k Keeper) StoreNewAuction(ctx sdk.Context, auction types.Auction) (uint64, sdk.Error) {
newAuctionID, err := k.GetNextAuctionID(ctx)
if err != nil {
return 0, err
}
auction = auction.WithID(newAuctionID)
k.SetAuction(ctx, auction)
err = k.IncrementNextAuctionID(ctx)
if err != nil {
return 0, err
}
return newAuctionID, nil
}
// SetAuction puts the auction into the database and adds it to the queue
// it overwrites any pre-existing auction with same ID
func (k Keeper) SetAuction(ctx sdk.Context, auction types.Auction) {
// remove the auction from the byTime index if it is already in there
existingAuction, found := k.GetAuction(ctx, auction.GetID())
if found {
k.RemoveFromIndex(ctx, existingAuction.GetEndTime(), existingAuction.GetID())
}
// store auction
store := prefix.NewStore(ctx.KVStore(k.storeKey), types.AuctionKeyPrefix)
bz := k.cdc.MustMarshalBinaryLengthPrefixed(auction)
store.Set(types.GetAuctionKey(auction.GetID()), bz)
// add to index
k.InsertIntoIndex(ctx, auction.GetEndTime(), auction.GetID())
}
// getAuction gets an auction from the store by auctionID
func (k Keeper) GetAuction(ctx sdk.Context, auctionID uint64) (types.Auction, bool) {
var auction types.Auction
store := prefix.NewStore(ctx.KVStore(k.storeKey), types.AuctionKeyPrefix)
bz := store.Get(types.GetAuctionKey(auctionID))
if bz == nil {
return auction, false
}
k.cdc.MustUnmarshalBinaryLengthPrefixed(bz, &auction)
return auction, true
}
// DeleteAuction removes an auction from the store without any validation
func (k Keeper) DeleteAuction(ctx sdk.Context, auctionID uint64) {
// remove from index
auction, found := k.GetAuction(ctx, auctionID)
if found {
k.RemoveFromIndex(ctx, auction.GetEndTime(), auctionID)
}
// delete auction
store := prefix.NewStore(ctx.KVStore(k.storeKey), types.AuctionKeyPrefix)
store.Delete(types.GetAuctionKey(auctionID))
}
// InsertIntoIndex adds an auction ID and end time into the byTime index
func (k Keeper) InsertIntoIndex(ctx sdk.Context, endTime time.Time, auctionID uint64) {
store := prefix.NewStore(ctx.KVStore(k.storeKey), types.AuctionByTimeKeyPrefix)
store.Set(types.GetAuctionByTimeKey(endTime, auctionID), types.Uint64ToBytes(auctionID)) // TODO
}
// RemoveFromIndex removes an auction ID and end time from the byTime index
func (k Keeper) RemoveFromIndex(ctx sdk.Context, endTime time.Time, auctionID uint64) {
store := prefix.NewStore(ctx.KVStore(k.storeKey), types.AuctionByTimeKeyPrefix)
store.Delete(types.GetAuctionByTimeKey(endTime, auctionID))
}
// IterateAuctionByTime provides an iterator over auctions ordered by auction.EndTime.
// For each auction cb will be callled. If cb returns true the iterator will close and stop.
// TODO can the cutoff time be removed in favour of caller specifying cutoffs in the callback?
func (k Keeper) IterateAuctionsByTime(ctx sdk.Context, inclusiveCutoffTime time.Time, cb func(auctionID uint64) (stop bool)) {
store := prefix.NewStore(ctx.KVStore(k.storeKey), types.AuctionByTimeKeyPrefix)
iterator := store.Iterator(
nil, // start at the very start of the prefix store
sdk.PrefixEndBytes(sdk.FormatTimeBytes(inclusiveCutoffTime)), // include any keys with times equal to inclusiveCutoffTime
)
defer iterator.Close()
for ; iterator.Valid(); iterator.Next() {
// TODO get the auction ID - either read from store, or extract from key
auctionID := types.Uint64FromBytes(iterator.Value())
if cb(auctionID) {
break
}
}
}
// IterateAuctions provides an iterator over all stored auctions.
// For each auction, cb will be called. If cb returns true, the iterator will close and stop.
func (k Keeper) IterateAuctions(ctx sdk.Context, cb func(auction types.Auction) (stop bool)) {
iterator := sdk.KVStorePrefixIterator(ctx.KVStore(k.storeKey), types.AuctionKeyPrefix)
defer iterator.Close()
for ; iterator.Valid(); iterator.Next() {
var auction types.Auction
k.cdc.MustUnmarshalBinaryLengthPrefixed(iterator.Value(), &auction)
if cb(auction) {
break
}
}
}