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Keepers

oracle module은 현재 다른 module에 전달할 수 있는 세 가지 exported keeper interface를 제공하여 price feed를 읽을 수 있게 합니다. Module은 필요한 기능을 제공하는 가장 제한적인 interface를 사용해야 합니다.

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Oracle Module ViewKeeper

oracle module ViewKeeper는 지원되는 모든 oracle type 및 oracle pair에 대한 price 데이터와 cumulative price 데이터를 얻는 기능을 제공합니다. 
type ViewKeeper interface {
    GetPrice(ctx sdk.Context, oracletype types.OracleType, base string, quote string) *math.LegacyDec // 주어진 oracle type에 대해 주어진 pair의 가격을 반환합니다.
    GetCumulativePrice(ctx sdk.Context, oracleType types.OracleType, base string, quote string) *math.LegacyDec // 주어진 oracle type에 대해 주어진 pair의 cumulative price를 반환합니다.
}
Coinbase oracle에 대한 GetPrice는 5분 TWAP price를 반환합니다.

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Band

BandKeeper는 BandPricefeed 및 BandRelayer를 생성/수정/읽기/삭제하는 기능을 제공합니다. 
type BandKeeper interface {
    GetBandPriceState(ctx sdk.Context, symbol string) *types.BandPriceState
    SetBandPriceState(ctx sdk.Context, symbol string, priceState types.BandPriceState)
    GetAllBandPriceStates(ctx sdk.Context) []types.BandPriceState
    GetBandReferencePrice(ctx sdk.Context, base string, quote string) *math.LegacyDec
    IsBandRelayer(ctx sdk.Context, relayer sdk.AccAddress) bool
    GetAllBandRelayers(ctx sdk.Context) []string
    SetBandRelayer(ctx sdk.Context, relayer sdk.AccAddress)
    DeleteBandRelayer(ctx sdk.Context, relayer sdk.AccAddress)
}

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Band IBC

BandIBCKeeper는 BandIBCOracleRequest, BandIBCPriceState, BandIBCLatestClientID 및 BandIBCCallDataRecord를 생성/수정/읽기/삭제하는 기능을 제공합니다. 
type BandIBCKeeper interface {
	SetBandIBCOracleRequest(ctx sdk.Context, req types.BandOracleRequest)
	GetBandIBCOracleRequest(ctx sdk.Context) *types.BandOracleRequest
	DeleteBandIBCOracleRequest(ctx sdk.Context, requestID uint64)
	GetAllBandIBCOracleRequests(ctx sdk.Context) []*types.BandOracleRequest

	GetBandIBCPriceState(ctx sdk.Context, symbol string) *types.BandPriceState
	SetBandIBCPriceState(ctx sdk.Context, symbol string, priceState types.BandPriceState)
	GetAllBandIBCPriceStates(ctx sdk.Context) []types.BandPriceState
	GetBandIBCReferencePrice(ctx sdk.Context, base string, quote string) *math.LegacyDec

	GetBandIBCLatestClientID(ctx sdk.Context) uint64
	SetBandIBCLatestClientID(ctx sdk.Context, clientID uint64)
	SetBandIBCCallDataRecord(ctx sdk.Context, clientID uint64, bandIBCCallDataRecord []byte)
	GetBandIBCCallDataRecord(ctx sdk.Context, clientID uint64) *types.CalldataRecord
}

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Coinbase

CoinbaseKeeper는 CoinbasePricefeed 데이터를 생성, 수정 및 읽는 기능을 제공합니다. 
type CoinbaseKeeper interface {
    GetCoinbasePrice(ctx sdk.Context, base string, quote string) *math.LegacyDec
    HasCoinbasePriceState(ctx sdk.Context, key string) bool
    GetCoinbasePriceState(ctx sdk.Context, key string) *types.CoinbasePriceState
    SetCoinbasePriceState(ctx sdk.Context, priceData *types.CoinbasePriceState) error
    GetAllCoinbasePriceStates(ctx sdk.Context) []*types.CoinbasePriceState
}
GetCoinbasePrice는 Coinbase가 제공하는 CoinbasePriceState.Timestamp 값을 기반으로 CoinbasePriceState의 5분 TWAP price를 반환합니다.

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PriceFeeder

PriceFeederKeeper는 PriceFeedPrice 및 PriceFeedRelayer를 생성/수정/읽기/삭제하는 기능을 제공합니다. 
type PriceFeederKeeper interface {
    IsPriceFeedRelayer(ctx sdk.Context, oracleBase, oracleQuote string, relayer sdk.AccAddress) bool
    GetAllPriceFeedStates(ctx sdk.Context) []*types.PriceFeedState
    GetAllPriceFeedRelayers(ctx sdk.Context, baseQuoteHash common.Hash) []string
    SetPriceFeedRelayer(ctx sdk.Context, oracleBase, oracleQuote string, relayer sdk.AccAddress)
    SetPriceFeedRelayerFromBaseQuoteHash(ctx sdk.Context, baseQuoteHash common.Hash, relayer sdk.AccAddress)
    DeletePriceFeedRelayer(ctx sdk.Context, oracleBase, oracleQuote string, relayer sdk.AccAddress)
    HasPriceFeedInfo(ctx sdk.Context, priceFeedInfo *types.PriceFeedInfo) bool
    GetPriceFeedInfo(ctx sdk.Context, baseQuoteHash common.Hash) *types.PriceFeedInfo
    SetPriceFeedInfo(ctx sdk.Context, priceFeedInfo *types.PriceFeedInfo)
    GetPriceFeedPriceState(ctx sdk.Context, base string, quote string) *types.PriceState
    SetPriceFeedPriceState(ctx sdk.Context, oracleBase, oracleQuote string, priceState *types.PriceState)
    GetPriceFeedPrice(ctx sdk.Context, base string, quote string) *math.LegacyDec
}

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Stork

StorkKeeper는 StorkPricefeed 및 StorkPublishers 데이터를 생성/수정/읽기하는 기능을 제공합니다. 
type StorkKeeper interface {
	GetStorkPrice(ctx sdk.Context, base string, quote string) *math.LegacyDec
	IsStorkPublisher(ctx sdk.Context, address string) bool
	SetStorkPublisher(ctx sdk.Context, address string)
	DeleteStorkPublisher(ctx sdk.Context, address string)
	GetAllStorkPublishers(ctx sdk.Context) []string

	SetStorkPriceState(ctx sdk.Context, priceData *types.StorkPriceState)
	GetStorkPriceState(ctx sdk.Context, symbol string) types.StorkPriceState
	GetAllStorkPriceStates(ctx sdk.Context) []*types.StorkPriceState
}
GetStorkPrice는 StorkPriceState의 price(value)를 반환합니다.