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Keepers

The oracle module currently provides three different exported keeper interfaces which can be passed to other modules which need to read price feeds. Modules should use the least-permissive interface which provides the functionality they require.

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Oracle Module ViewKeeper

The oracle module ViewKeeper provides the ability to obtain price data as well as cumulative price data for any supported oracle type and oracle pair. 
type ViewKeeper interface {
    GetPrice(ctx sdk.Context, oracletype types.OracleType, base string, quote string) *math.LegacyDec // Returns the price for a given pair for a given oracle type.
    GetCumulativePrice(ctx sdk.Context, oracleType types.OracleType, base string, quote string) *math.LegacyDec // Returns the cumulative price for a given pair for a given oracle type.
}
Note that the GetPrice for Coinbase oracles returns the 5 minute TWAP price.

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Band

The BandKeeper provides the ability to create/modify/read/delete BandPricefeed and BandRelayer. 
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

The BandIBCKeeper provides the ability to create/modify/read/delete BandIBCOracleRequest, BandIBCPriceState, BandIBCLatestClientID and BandIBCCallDataRecord. 
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

The CoinbaseKeeper provides the ability to create, modify and read CoinbasePricefeed data. 
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
}
The GetCoinbasePrice returns the 5 minute TWAP price of the CoinbasePriceState based off the CoinbasePriceState.Timestamp values provided by Coinbase.

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PriceFeeder

The PriceFeederKeeper provides the ability to create/modify/read/delete PriceFeedPrice and PriceFeedRelayer. 
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

The StorkKeeper provides the ability to create/modify/read StorkPricefeed and StorkPublishers data. 
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
}
The GetStorkPrice returns the price(value) of the StorkPriceState.