feat: draft params for pricefeed

go.sum

@@ -43,6 +43,7 @@ github.com/cosmos/cosmos-sdk v0.34.4-0.20191010155330-64a27412505c/go.mod h1:Fxj
 github.com/cosmos/cosmos-sdk v0.34.4-0.20191010193331-18de630d0ae1 h1:yb+E8HGzFnO0YwLS6OCBIAVWtN8KfCYoKeO9mgAmQN0=
 github.com/cosmos/cosmos-sdk v0.34.4-0.20191010193331-18de630d0ae1/go.mod h1:IGBhkbOK1ebLqMWjtgo99zUxWHsA5IOb6N9CI8nHs0Y=
 github.com/cosmos/cosmos-sdk v0.37.1 h1:mz5W3Au32VIPPtrY65dheVYeVDSFfS3eSSmuIj+cXsI=
+github.com/cosmos/cosmos-sdk v0.37.4 h1:1ioXxkpiS+wOgaUbROeDIyuF7hciU5nti0TSyBmV2Ok=
 github.com/cosmos/go-bip39 v0.0.0-20180618194314-52158e4697b8 h1:Iwin12wRQtyZhH6FV3ykFcdGNlYEzoeR0jN8Vn+JWsI=
 github.com/cosmos/go-bip39 v0.0.0-20180618194314-52158e4697b8/go.mod h1:tSxLoYXyBmiFeKpvmq4dzayMdCjCnu8uqmCysIGBT2Y=
 github.com/cosmos/ledger-cosmos-go v0.10.3 h1:Qhi5yTR5Pg1CaTpd00pxlGwNl4sFRdtK1J96OTjeFFc=

x/pricefeed/abci.go

@@ -0,0 +1,20 @@
+package pricefeed
+
+import (
+	sdk "github.com/cosmos/cosmos-sdk/types"
+)
+
+// EndBlocker updates the current pricefeed
+func EndBlocker(ctx sdk.Context, k Keeper) {
+	// Update the current price of each asset.
+	for _, a := range k.GetAssetParams(ctx) {
+		if a.Active {
+			err := k.SetCurrentPrices(ctx, a.AssetCode)
+			if err != nil {
+				// TODO emit an event that price failed to update
+				continue
+			}
+		}
+	}
+	return
+}

x/pricefeed/alias.go

@@ -2,26 +2,34 @@
 // autogenerated code using github.com/rigelrozanski/multitool
 // aliases generated for the following subdirectories:
 // ALIASGEN: github.com/kava-labs/kava/x/pricefeed/types/
+// ALIASGEN: github.com/kava-labs/kava/x/pricefeed/keeper/
 package pricefeed
 
 import (
+	"github.com/kava-labs/kava/x/pricefeed/keeper"
 	"github.com/kava-labs/kava/x/pricefeed/types"
 )
 
 const (
-	DefaultCodespace  = types.DefaultCodespace
+	DefaultCodespace   = types.DefaultCodespace
-	CodeEmptyInput    = types.CodeEmptyInput
+	CodeEmptyInput     = types.CodeEmptyInput
-	CodeExpired       = types.CodeExpired
+	CodeExpired        = types.CodeExpired
-	CodeInvalidPrice  = types.CodeInvalidPrice
+	CodeInvalidPrice   = types.CodeInvalidPrice
-	CodeInvalidAsset  = types.CodeInvalidAsset
+	CodeInvalidAsset   = types.CodeInvalidAsset
-	CodeInvalidOracle = types.CodeInvalidOracle
+	CodeInvalidOracle  = types.CodeInvalidOracle
-	ModuleName        = types.ModuleName
+	ModuleName         = types.ModuleName
-	StoreKey          = types.StoreKey
+	StoreKey           = types.StoreKey
-	RouterKey         = types.RouterKey
+	RouterKey          = types.RouterKey
-	TypeMsgPostPrice  = types.TypeMsgPostPrice
+	QuerierRoute       = types.QuerierRoute
-	QueryCurrentPrice = types.QueryCurrentPrice
+	DefaultParamspace  = types.DefaultParamspace
-	QueryRawPrices    = types.QueryRawPrices
+	RawPriceFeedPrefix = types.RawPriceFeedPrefix
-	QueryAssets       = types.QueryAssets
+	CurrentPricePrefix = types.CurrentPricePrefix
+	AssetPrefix        = types.AssetPrefix
+	OraclePrefix       = types.OraclePrefix
+	TypeMsgPostPrice   = types.TypeMsgPostPrice
+	QueryCurrentPrice  = types.QueryCurrentPrice
+	QueryRawPrices     = types.QueryRawPrices
+	QueryAssets        = types.QueryAssets
 )
 
 var (
@@ -37,28 +45,29 @@ var (
 	ValidateGenesis     = types.ValidateGenesis
 	NewMsgPostPrice     = types.NewMsgPostPrice
 	ParamKeyTable       = types.ParamKeyTable
-	NewAssetParams      = types.NewAssetParams
+	NewParams           = types.NewParams
-	DefaultAssetParams  = types.DefaultAssetParams
+	DefaultParams       = types.DefaultParams
-	NewOracleParams     = types.NewOracleParams
+	NewKeeper           = keeper.NewKeeper
-	DefaultOracleParams = types.DefaultOracleParams
+	NewQuerier          = keeper.NewQuerier
 
 	// variable aliases
-	ModuleCdc            = types.ModuleCdc
+	ModuleCdc = types.ModuleCdc
-	ParamStoreKeyOracles = types.ParamStoreKeyOracles
+	KeyAssets = types.KeyAssets
-	ParamStoreKeyAssets  = types.ParamStoreKeyAssets
 )
 
 type (
 	GenesisState       = types.GenesisState
 	MsgPostPrice       = types.MsgPostPrice
-	AssetParams        = types.AssetParams
+	Params             = types.Params
-	OracleParams       = types.OracleParams
 	ParamSubspace      = types.ParamSubspace
 	QueryRawPricesResp = types.QueryRawPricesResp
 	QueryAssetsResp    = types.QueryAssetsResp
 	Asset              = types.Asset
+	Assets             = types.Assets
 	Oracle             = types.Oracle
+	Oracles            = types.Oracles
 	CurrentPrice       = types.CurrentPrice
 	PostedPrice        = types.PostedPrice
 	SortDecs           = types.SortDecs
+	Keeper             = keeper.Keeper
 )

x/pricefeed/client/cli/tx.go

@@ -2,6 +2,7 @@ package cli
 
 import (
 	"fmt"
+	"time"
 
 	"github.com/spf13/cobra"
 
@@ -12,6 +13,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/x/auth"
 	"github.com/cosmos/cosmos-sdk/x/auth/client/utils"
 	"github.com/kava-labs/kava/x/pricefeed/types"
+	tmtime "github.com/tendermint/tendermint/types/time"
 )
 
 // GetTxCmd returns the transaction commands for this module
@@ -47,11 +49,13 @@ func GetCmdPostPrice(cdc *codec.Codec) *cobra.Command {
 			if err != nil {
 				return err
 			}
-			expiry, ok := sdk.NewIntFromString(args[2])
+			expiryInt, ok := sdk.NewIntFromString(args[2])
 			if !ok {
 				fmt.Printf("invalid expiry - %s \n", args[2])
 				return nil
 			}
+			expiry := tmtime.Canonical(time.Unix(expiryInt.Int64(), 0))
+
 			msg := types.NewMsgPostPrice(cliCtx.GetFromAddress(), args[0], price, expiry)
 			err = msg.ValidateBasic()
 			if err != nil {

x/pricefeed/client/rest/rest.go

@@ -3,6 +3,7 @@ package rest
 import (
 	"fmt"
 	"net/http"
+	"time"
 
 	"github.com/cosmos/cosmos-sdk/client/context"
 	sdk "github.com/cosmos/cosmos-sdk/types"
@@ -10,6 +11,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/x/auth/client/utils"
 	"github.com/gorilla/mux"
 	"github.com/kava-labs/kava/x/pricefeed/types"
+	tmtime "github.com/tendermint/tendermint/types/time"
 )
 
 const (
@@ -57,11 +59,12 @@ func postPriceHandler(cliCtx context.CLIContext) http.HandlerFunc {
 			return
 		}
 
-		expiry, ok := sdk.NewIntFromString(req.Expiry)
+		expiryInt, ok := sdk.NewIntFromString(req.Expiry)
 		if !ok {
 			rest.WriteErrorResponse(w, http.StatusBadRequest, "invalid expiry")
 			return
 		}
+		expiry := tmtime.Canonical(time.Unix(expiryInt.Int64(), 0))
 
 		// create the message
 		msg := types.NewMsgPostPrice(addr, req.AssetCode, price, expiry)

x/pricefeed/genesis.go

@@ -4,29 +4,25 @@ import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
-
 // InitGenesis sets distribution information for genesis.
 func InitGenesis(ctx sdk.Context, keeper Keeper, data GenesisState) {
 
 	// Set the assets and oracles from params
-	keeper.SetAssetParams(ctx, data.AssetParams)
+	keeper.SetParams(ctx, data.Params)
-	keeper.SetOracleParams(ctx ,data.OracleParams)
 
 	// Iterate through the posted prices and set them in the store
 	for _, pp := range data.PostedPrices {
-		addr, err := sdk.AccAddressFromBech32(pp.OracleAddress)
+		_, err := keeper.SetPrice(ctx, pp.OracleAddress, pp.AssetCode, pp.Price, pp.Expiry)
-		if err != nil {
-			panic(err)
-		}
-		_, err = keeper.SetPrice(ctx, addr, pp.AssetCode, pp.Price, pp.Expiry)
 		if err != nil {
 			panic(err)
 		}
 	}
 
 	// Set the current price (if any) based on what's now in the store
-	if err := keeper.SetCurrentPrices(ctx); err != nil {
+	for _, a := range data.Params.Assets {
-		panic(err)
+		if a.Active {
+			_ = keeper.SetCurrentPrices(ctx, a.AssetCode)
+		}
 	}
 }
 
@@ -34,18 +30,16 @@ func InitGenesis(ctx sdk.Context, keeper Keeper, data GenesisState) {
 func ExportGenesis(ctx sdk.Context, keeper Keeper) GenesisState {
 
 	// Get the params for assets and oracles
-	assetParams := keeper.GetAssetParams(ctx)
+	params := keeper.GetParams(ctx)
-	oracleParams := keeper.GetOracleParams(ctx)
 
 	var postedPrices []PostedPrice
-	for _, asset := range keeper.GetAssets(ctx) {
+	for _, asset := range keeper.GetAssetParams(ctx) {
 		pp := keeper.GetRawPrices(ctx, asset.AssetCode)
 		postedPrices = append(postedPrices, pp...)
 	}
 
 	return GenesisState{
-		AssetParams:  assetParams,
+		Params:       params,
-		OracleParams: oracleParams,
 		PostedPrices: postedPrices,
 	}
 }

x/pricefeed/handler.go

@@ -29,22 +29,10 @@ func HandleMsgPostPrice(
 	msg MsgPostPrice) sdk.Result {
 
 	// TODO cleanup message validation and errors
-	err := k.ValidatePostPrice(ctx, msg)
+	_, err := k.GetOracle(ctx, msg.AssetCode, msg.From)
 	if err != nil {
-		return err.Result()
+		return ErrInvalidOracle(k.Codespace()).Result()
 	}
 	k.SetPrice(ctx, msg.From, msg.AssetCode, msg.Price, msg.Expiry)
 	return sdk.Result{}
 }
-
-// EndBlocker updates the current pricefeed
-func EndBlocker(ctx sdk.Context, k Keeper) {
-	// TODO val_state_change.go is relevant if we want to rotate the oracle set
-
-	// Running in the end blocker ensures that prices will update at most once per block,
-	// which seems preferable to having state storage values change in response to multiple transactions
-	// which occur during a block
-	//TODO use an iterator and update the prices for all assets in the store
-	k.SetCurrentPrices(ctx)
-	return
-}

x/pricefeed/keeper.go

@@ -1,280 +0,0 @@
-package pricefeed
-
-import (
-	"sort"
-
-	"github.com/cosmos/cosmos-sdk/codec"
-	sdk "github.com/cosmos/cosmos-sdk/types"
-)
-
-// TODO refactor constants to app.go
-const (
-	// QuerierRoute is the querier route for gov
-	QuerierRoute = ModuleName
-
-	// Parameter store default namestore
-	DefaultParamspace = ModuleName
-
-	// Store prefix for the raw pricefeed of an asset
-	RawPriceFeedPrefix = StoreKey + ":raw:"
-
-	// Store prefix for the current price of an asset
-	CurrentPricePrefix = StoreKey + ":currentprice:"
-
-	// Store Prefix for the assets in the pricefeed system
-	AssetPrefix = StoreKey + ":assets"
-
-	// OraclePrefix store prefix for the oracle accounts
-	OraclePrefix = StoreKey + ":oracles"
-)
-
-// Keeper struct for pricefeed module
-type Keeper struct {
-	// The reference to the Paramstore to get and set pricefeed specific params
-	paramSpace ParamSubspace
-	// The keys used to access the stores from Context
-	storeKey sdk.StoreKey
-	// Codec for binary encoding/decoding
-	cdc *codec.Codec
-	// Reserved codespace
-	codespace sdk.CodespaceType
-}
-
-// NewKeeper returns a new keeper for the pricefeed module. It handles:
-// - adding oracles
-// - adding/removing assets from the pricefeed
-func NewKeeper(
-	storeKey sdk.StoreKey, cdc *codec.Codec, paramSpace ParamSubspace, codespace sdk.CodespaceType,
-) Keeper {
-	return Keeper{
-		paramSpace: paramSpace,
-		storeKey:   storeKey,
-		cdc:        cdc,
-		codespace:  codespace,
-	}
-}
-
-// // AddOracle adds an Oracle to the store
-// func (k Keeper) AddOracle(ctx sdk.Context, address string) {
-
-// 	oracles := k.GetOracles(ctx)
-// 	oracles = append(oracles, Oracle{OracleAddress: address})
-// 	store := ctx.KVStore(k.storeKey)
-// 	store.Set(
-// 		[]byte(OraclePrefix), k.cdc.MustMarshalBinaryBare(oracles),
-// 	)
-// }
-
-// // AddAsset adds an asset to the store
-// func (k Keeper) AddAsset(
-// 	ctx sdk.Context,
-// 	assetCode string,
-// 	desc string,
-// ) {
-// 	assets := k.GetAssets(ctx)
-// 	assets = append(assets, Asset{AssetCode: assetCode, Description: desc})
-// 	store := ctx.KVStore(k.storeKey)
-// 	store.Set(
-// 		[]byte(AssetPrefix), k.cdc.MustMarshalBinaryBare(assets),
-// 	)
-// }
-
-func (k Keeper) SetAssetParams(ctx sdk.Context, ap AssetParams) {
-	k.paramSpace.Set(ctx, ParamStoreKeyAssets, &ap)
-}
-
-func (k Keeper) SetOracleParams(ctx sdk.Context, op OracleParams) {
-	k.paramSpace.Set(ctx, ParamStoreKeyOracles, &op)
-}
-
-// SetPrice updates the posted price for a specific oracle
-func (k Keeper) SetPrice(
-	ctx sdk.Context,
-	oracle sdk.AccAddress,
-	assetCode string,
-	price sdk.Dec,
-	expiry sdk.Int) (PostedPrice, sdk.Error) {
-	// If the expiry is less than or equal to the current blockheight, we consider the price valid
-	if expiry.GTE(sdk.NewInt(ctx.BlockHeight())) {
-		store := ctx.KVStore(k.storeKey)
-		prices := k.GetRawPrices(ctx, assetCode)
-		var index int
-		found := false
-		for i := range prices {
-			if prices[i].OracleAddress == oracle.String() {
-				index = i
-				found = true
-				break
-			}
-		}
-		// set the price for that particular oracle
-		if found {
-			prices[index] = PostedPrice{AssetCode: assetCode, OracleAddress: oracle.String(), Price: price, Expiry: expiry}
-		} else {
-			prices = append(prices, PostedPrice{
-				assetCode, oracle.String(), price, expiry,
-			})
-			index = len(prices) - 1
-		}
-
-		store.Set(
-			[]byte(RawPriceFeedPrefix+assetCode), k.cdc.MustMarshalBinaryBare(prices),
-		)
-		return prices[index], nil
-	}
-	return PostedPrice{}, ErrExpired(k.codespace)
-
-}
-
-// SetCurrentPrices updates the price of an asset to the meadian of all valid oracle inputs
-func (k Keeper) SetCurrentPrices(ctx sdk.Context) sdk.Error {
-	assets := k.GetAssets(ctx)
-	for _, v := range assets {
-		assetCode := v.AssetCode
-		prices := k.GetRawPrices(ctx, assetCode)
-		var notExpiredPrices []CurrentPrice
-		// filter out expired prices
-		for _, v := range prices {
-			if v.Expiry.GTE(sdk.NewInt(ctx.BlockHeight())) {
-				notExpiredPrices = append(notExpiredPrices, CurrentPrice{
-					AssetCode: v.AssetCode,
-					Price:     v.Price,
-					Expiry:    v.Expiry,
-				})
-			}
-		}
-		l := len(notExpiredPrices)
-		var medianPrice sdk.Dec
-		var expiry sdk.Int
-		// TODO make threshold for acceptance (ie. require 51% of oracles to have posted valid prices
-		if l == 0 {
-			// Error if there are no valid prices in the raw pricefeed
-			return ErrNoValidPrice(k.codespace)
-		} else if l == 1 {
-			// Return immediately if there's only one price
-			medianPrice = notExpiredPrices[0].Price
-			expiry = notExpiredPrices[0].Expiry
-		} else {
-			// sort the prices
-			sort.Slice(notExpiredPrices, func(i, j int) bool {
-				return notExpiredPrices[i].Price.LT(notExpiredPrices[j].Price)
-			})
-			// If there's an even number of prices
-			if l%2 == 0 {
-				// TODO make sure this is safe.
-				// Since it's a price and not a balance, division with precision loss is OK.
-				price1 := notExpiredPrices[l/2-1].Price
-				price2 := notExpiredPrices[l/2].Price
-				sum := price1.Add(price2)
-				divsor, _ := sdk.NewDecFromStr("2")
-				medianPrice = sum.Quo(divsor)
-				// TODO Check if safe, makes sense
-				// Takes the average of the two expiries rounded down to the nearest Int.
-				expiry = notExpiredPrices[l/2-1].Expiry.Add(notExpiredPrices[l/2].Expiry).Quo(sdk.NewInt(2))
-			} else {
-				// integer division, so we'll get an integer back, rounded down
-				medianPrice = notExpiredPrices[l/2].Price
-				expiry = notExpiredPrices[l/2].Expiry
-			}
-		}
-
-		store := ctx.KVStore(k.storeKey)
-		currentPrice := CurrentPrice{
-			AssetCode: assetCode,
-			Price:     medianPrice,
-			Expiry:    expiry,
-		}
-		store.Set(
-			[]byte(CurrentPricePrefix+assetCode), k.cdc.MustMarshalBinaryBare(currentPrice),
-		)
-	}
-
-	return nil
-}
-
-func (k Keeper) GetOracleParams(ctx sdk.Context) OracleParams {
-	var op OracleParams
-	k.paramSpace.Get(ctx, ParamStoreKeyOracles, &op)
-	return op
-}
-
-// GetOracles returns the oracles in the pricefeed store
-func (k Keeper) GetOracles(ctx sdk.Context) []Oracle {
-	var op OracleParams
-	k.paramSpace.Get(ctx, ParamStoreKeyOracles, &op)
-	return op.Oracles
-}
-
-func (k Keeper) GetAssetParams(ctx sdk.Context) AssetParams {
-	var ap AssetParams
-	k.paramSpace.Get(ctx, ParamStoreKeyAssets, &ap)
-	return ap
-}
-
-// GetAssets returns the assets in the pricefeed store
-func (k Keeper) GetAssets(ctx sdk.Context) []Asset {
-	var ap AssetParams
-	k.paramSpace.Get(ctx, ParamStoreKeyAssets, &ap)
-	return ap.Assets
-}
-
-// GetAsset returns the asset if it is in the pricefeed system
-func (k Keeper) GetAsset(ctx sdk.Context, assetCode string) (Asset, bool) {
-	assets := k.GetAssets(ctx)
-
-	for i := range assets {
-		if assets[i].AssetCode == assetCode {
-			return assets[i], true
-		}
-	}
-	return Asset{}, false
-
-}
-
-// GetOracle returns the oracle address as a string if it is in the pricefeed store
-func (k Keeper) GetOracle(ctx sdk.Context, oracle string) (Oracle, bool) {
-	oracles := k.GetOracles(ctx)
-
-	for i := range oracles {
-		if oracles[i].OracleAddress == oracle {
-			return oracles[i], true
-		}
-	}
-	return Oracle{}, false
-
-}
-
-// GetCurrentPrice fetches the current median price of all oracles for a specific asset
-func (k Keeper) GetCurrentPrice(ctx sdk.Context, assetCode string) CurrentPrice {
-	store := ctx.KVStore(k.storeKey)
-	bz := store.Get([]byte(CurrentPricePrefix + assetCode))
-	// TODO panic or return error if not found
-	var price CurrentPrice
-	k.cdc.MustUnmarshalBinaryBare(bz, &price)
-	return price
-}
-
-// GetRawPrices fetches the set of all prices posted by oracles for an asset
-func (k Keeper) GetRawPrices(ctx sdk.Context, assetCode string) []PostedPrice {
-	store := ctx.KVStore(k.storeKey)
-	bz := store.Get([]byte(RawPriceFeedPrefix + assetCode))
-	var prices []PostedPrice
-	k.cdc.MustUnmarshalBinaryBare(bz, &prices)
-	return prices
-}
-
-// ValidatePostPrice makes sure the person posting the price is an oracle
-func (k Keeper) ValidatePostPrice(ctx sdk.Context, msg MsgPostPrice) sdk.Error {
-	// TODO implement this
-
-	_, assetFound := k.GetAsset(ctx, msg.AssetCode)
-	if !assetFound {
-		return ErrInvalidAsset(k.codespace)
-	}
-	_, oracleFound := k.GetOracle(ctx, msg.From.String())
-	if !oracleFound {
-		return ErrInvalidOracle(k.codespace)
-	}
-
-	return nil
-}

x/pricefeed/keeper/keeper.go

@@ -0,0 +1,160 @@
+package keeper
+
+import (
+	"sort"
+	"time"
+
+	"github.com/cosmos/cosmos-sdk/codec"
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/x/params"
+
+	"github.com/kava-labs/kava/x/pricefeed/types"
+)
+
+// Keeper struct for pricefeed module
+type Keeper struct {
+	// The keys used to access the stores from Context
+	storeKey sdk.StoreKey
+	// Codec for binary encoding/decoding
+	cdc *codec.Codec
+	// The reference to the Paramstore to get and set pricefeed specific params
+	paramstore params.Subspace
+	// Reserved codespace
+	codespace sdk.CodespaceType
+}
+
+// NewKeeper returns a new keeper for the pricefeed module. It handles:
+// - adding oracles
+// - adding/removing assets from the pricefeed
+func NewKeeper(
+	storeKey sdk.StoreKey, cdc *codec.Codec, paramstore params.Subspace, codespace sdk.CodespaceType,
+) Keeper {
+	return Keeper{
+		paramstore: paramstore.WithKeyTable(types.ParamKeyTable()),
+		storeKey:   storeKey,
+		cdc:        cdc,
+		codespace:  codespace,
+	}
+}
+
+// SetPrice updates the posted price for a specific oracle
+func (k Keeper) SetPrice(
+	ctx sdk.Context,
+	oracle sdk.AccAddress,
+	assetCode string,
+	price sdk.Dec,
+	expiry time.Time) (types.PostedPrice, sdk.Error) {
+	// If the expiry is less than or equal to the current blockheight, we consider the price valid
+	if expiry.After(ctx.BlockTime()) {
+		store := ctx.KVStore(k.storeKey)
+		prices := k.GetRawPrices(ctx, assetCode)
+		var index int
+		found := false
+		for i := range prices {
+			if prices[i].OracleAddress.Equals(oracle) {
+				index = i
+				found = true
+				break
+			}
+		}
+		// set the price for that particular oracle
+		if found {
+			prices[index] = types.PostedPrice{
+				AssetCode: assetCode, OracleAddress: oracle,
+				Price: price, Expiry: expiry}
+		} else {
+			prices = append(prices, types.PostedPrice{
+				AssetCode: assetCode, OracleAddress: oracle,
+				Price: price, Expiry: expiry})
+			index = len(prices) - 1
+		}
+
+		store.Set(
+			[]byte(types.RawPriceFeedPrefix+assetCode), k.cdc.MustMarshalBinaryBare(prices),
+		)
+		return prices[index], nil
+	}
+	return types.PostedPrice{}, types.ErrExpired(k.codespace)
+
+}
+
+// SetCurrentPrices updates the price of an asset to the meadian of all valid oracle inputs
+func (k Keeper) SetCurrentPrices(ctx sdk.Context, assetCode string) sdk.Error {
+	_, ok := k.GetAsset(ctx, assetCode)
+	if !ok {
+		return types.ErrInvalidAsset(k.codespace)
+	}
+	prices := k.GetRawPrices(ctx, assetCode)
+	var notExpiredPrices []types.CurrentPrice
+	// filter out expired prices
+	for _, v := range prices {
+		if v.Expiry.After(ctx.BlockTime()) {
+			notExpiredPrices = append(notExpiredPrices, types.CurrentPrice{
+				AssetCode: v.AssetCode,
+				Price:     v.Price,
+			})
+		}
+	}
+	l := len(notExpiredPrices)
+	var medianPrice sdk.Dec
+	// TODO make threshold for acceptance (ie. require 51% of oracles to have posted valid prices
+	if l == 0 {
+		// Error if there are no valid prices in the raw pricefeed
+		return types.ErrNoValidPrice(k.codespace)
+	} else if l == 1 {
+		// Return immediately if there's only one price
+		medianPrice = notExpiredPrices[0].Price
+	} else {
+		// sort the prices
+		sort.Slice(notExpiredPrices, func(i, j int) bool {
+			return notExpiredPrices[i].Price.LT(notExpiredPrices[j].Price)
+		})
+		// If there's an even number of prices
+		if l%2 == 0 {
+			// TODO make sure this is safe.
+			// Since it's a price and not a balance, division with precision loss is OK.
+			price1 := notExpiredPrices[l/2-1].Price
+			price2 := notExpiredPrices[l/2].Price
+			sum := price1.Add(price2)
+			divsor, _ := sdk.NewDecFromStr("2")
+			medianPrice = sum.Quo(divsor)
+		} else {
+			// integer division, so we'll get an integer back, rounded down
+			medianPrice = notExpiredPrices[l/2].Price
+		}
+	}
+
+	store := ctx.KVStore(k.storeKey)
+	currentPrice := types.CurrentPrice{
+		AssetCode: assetCode,
+		Price:     medianPrice,
+	}
+	store.Set(
+		[]byte(types.CurrentPricePrefix+assetCode), k.cdc.MustMarshalBinaryBare(currentPrice),
+	)
+
+	return nil
+}
+
+// GetCurrentPrice fetches the current median price of all oracles for a specific asset
+func (k Keeper) GetCurrentPrice(ctx sdk.Context, assetCode string) types.CurrentPrice {
+	store := ctx.KVStore(k.storeKey)
+	bz := store.Get([]byte(types.CurrentPricePrefix + assetCode))
+	// TODO panic or return error if not found
+	var price types.CurrentPrice
+	k.cdc.MustUnmarshalBinaryBare(bz, &price)
+	return price
+}
+
+// GetRawPrices fetches the set of all prices posted by oracles for an asset
+func (k Keeper) GetRawPrices(ctx sdk.Context, assetCode string) []types.PostedPrice {
+	store := ctx.KVStore(k.storeKey)
+	bz := store.Get([]byte(types.RawPriceFeedPrefix + assetCode))
+	var prices []types.PostedPrice
+	k.cdc.MustUnmarshalBinaryBare(bz, &prices)
+	return prices
+}
+
+func (k Keeper) Codespace() sdk.CodespaceType {
+	return k.codespace
+}

x/pricefeed/keeper/keeper_test.go

@@ -0,0 +1,141 @@
+package keeper
+
+import (
+	"testing"
+	"time"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/stretchr/testify/require"
+	abci "github.com/tendermint/tendermint/abci/types"
+	tmtime "github.com/tendermint/tendermint/types/time"
+
+	"github.com/kava-labs/kava/x/pricefeed/types"
+)
+
+// TestKeeper_SetGetAsset tests adding assets to the pricefeed, getting assets from the store
+func TestKeeper_SetGetAsset(t *testing.T) {
+	helper := getMockApp(t, 0, types.GenesisState{}, nil)
+	header := abci.Header{
+		Height: helper.mApp.LastBlockHeight() + 1,
+		Time:   tmtime.Now()}
+	helper.mApp.BeginBlock(abci.RequestBeginBlock{Header: header})
+	ctx := helper.mApp.BaseApp.NewContext(false, header)
+
+	ap := types.Params{
+		Assets: []types.Asset{
+			types.Asset{AssetCode: "tstusd", BaseAsset: "tst", QuoteAsset: "usd", Oracles: types.Oracles{}, Active: true},
+		},
+	}
+	helper.keeper.SetParams(ctx, ap)
+	assets := helper.keeper.GetAssetParams(ctx)
+	require.Equal(t, len(assets), 1)
+	require.Equal(t, assets[0].AssetCode, "tstusd")
+
+	_, found := helper.keeper.GetAsset(ctx, "tstusd")
+	require.Equal(t, found, true)
+
+	ap = types.Params{
+		Assets: []types.Asset{
+			types.Asset{AssetCode: "tstusd", BaseAsset: "tst", QuoteAsset: "usd", Oracles: types.Oracles{}, Active: true},
+			types.Asset{AssetCode: "tst2usd", BaseAsset: "tst2", QuoteAsset: "usd", Oracles: types.Oracles{}, Active: true},
+		},
+	}
+	helper.keeper.SetParams(ctx, ap)
+	assets = helper.keeper.GetAssetParams(ctx)
+	require.Equal(t, len(assets), 2)
+	require.Equal(t, assets[0].AssetCode, "tstusd")
+	require.Equal(t, assets[1].AssetCode, "tst2usd")
+
+	_, found = helper.keeper.GetAsset(ctx, "nan")
+	require.Equal(t, found, false)
+}
+
+// TestKeeper_GetSetPrice Test Posting the price by an oracle
+func TestKeeper_GetSetPrice(t *testing.T) {
+	helper := getMockApp(t, 2, types.GenesisState{}, nil)
+	header := abci.Header{
+		Height: helper.mApp.LastBlockHeight() + 1,
+		Time:   tmtime.Now()}
+	helper.mApp.BeginBlock(abci.RequestBeginBlock{Header: header})
+	ctx := helper.mApp.BaseApp.NewContext(false, header)
+	ap := types.Params{
+		Assets: []types.Asset{
+			types.Asset{AssetCode: "tstusd", BaseAsset: "tst", QuoteAsset: "usd", Oracles: types.Oracles{}, Active: true},
+		},
+	}
+	helper.keeper.SetParams(ctx, ap)
+	// Set price by oracle 1
+	_, err := helper.keeper.SetPrice(
+		ctx, helper.addrs[0], "tstusd",
+		sdk.MustNewDecFromStr("0.33"),
+		header.Time.Add(1*time.Hour))
+	require.NoError(t, err)
+	// Get raw prices
+	rawPrices := helper.keeper.GetRawPrices(ctx, "tstusd")
+	require.Equal(t, len(rawPrices), 1)
+	require.Equal(t, rawPrices[0].Price.Equal(sdk.MustNewDecFromStr("0.33")), true)
+	// Set price by oracle 2
+	_, err = helper.keeper.SetPrice(
+		ctx, helper.addrs[1], "tstusd",
+		sdk.MustNewDecFromStr("0.35"),
+		header.Time.Add(time.Hour*1))
+	require.NoError(t, err)
+
+	rawPrices = helper.keeper.GetRawPrices(ctx, "tstusd")
+	require.Equal(t, len(rawPrices), 2)
+	require.Equal(t, rawPrices[1].Price.Equal(sdk.MustNewDecFromStr("0.35")), true)
+
+	// Update Price by Oracle 1
+	_, err = helper.keeper.SetPrice(
+		ctx, helper.addrs[0], "tstusd",
+		sdk.MustNewDecFromStr("0.37"),
+		header.Time.Add(time.Hour*1))
+	require.NoError(t, err)
+	rawPrices = helper.keeper.GetRawPrices(ctx, "tstusd")
+	require.Equal(t, rawPrices[0].Price.Equal(sdk.MustNewDecFromStr("0.37")), true)
+}
+
+// TestKeeper_GetSetCurrentPrice Test Setting the median price of an Asset
+func TestKeeper_GetSetCurrentPrice(t *testing.T) {
+	helper := getMockApp(t, 4, types.GenesisState{}, nil)
+	header := abci.Header{
+		Height: helper.mApp.LastBlockHeight() + 1,
+		Time:   tmtime.Now()}
+	helper.mApp.BeginBlock(abci.RequestBeginBlock{Header: header})
+	ctx := helper.mApp.BaseApp.NewContext(false, header)
+	ap := types.Params{
+		Assets: []types.Asset{
+			types.Asset{AssetCode: "tstusd", BaseAsset: "tst", QuoteAsset: "usd", Oracles: types.Oracles{}, Active: true},
+		},
+	}
+	helper.keeper.SetParams(ctx, ap)
+	helper.keeper.SetPrice(
+		ctx, helper.addrs[0], "tstusd",
+		sdk.MustNewDecFromStr("0.33"),
+		header.Time.Add(time.Hour*1))
+	helper.keeper.SetPrice(
+		ctx, helper.addrs[1], "tstusd",
+		sdk.MustNewDecFromStr("0.35"),
+		header.Time.Add(time.Hour*1))
+	helper.keeper.SetPrice(
+		ctx, helper.addrs[2], "tstusd",
+		sdk.MustNewDecFromStr("0.34"),
+		header.Time.Add(time.Hour*1))
+	// Set current price
+	err := helper.keeper.SetCurrentPrices(ctx, "tstusd")
+	require.NoError(t, err)
+	// Get Current price
+	price := helper.keeper.GetCurrentPrice(ctx, "tstusd")
+	require.Equal(t, price.Price.Equal(sdk.MustNewDecFromStr("0.34")), true)
+
+	// Even number of oracles
+	helper.keeper.SetPrice(
+		ctx, helper.addrs[3], "tstusd",
+		sdk.MustNewDecFromStr("0.36"),
+		header.Time.Add(time.Hour*1))
+	err = helper.keeper.SetCurrentPrices(ctx, "tstusd")
+	require.NoError(t, err)
+	price = helper.keeper.GetCurrentPrice(ctx, "tstusd")
+	require.Equal(t, price.Price.Equal(sdk.MustNewDecFromStr("0.345")), true)
+
+}

x/pricefeed/keeper/params.go

@@ -0,0 +1,64 @@
+package keeper
+
+import (
+	"fmt"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+
+	"github.com/kava-labs/kava/x/pricefeed/types"
+)
+
+// GetParams gets params from the store
+func (k Keeper) GetParams(ctx sdk.Context) types.Params {
+	return types.NewParams(k.GetAssetParams(ctx))
+}
+
+// SetParams updates params in the store
+func (k Keeper) SetParams(ctx sdk.Context, params types.Params) {
+	k.paramstore.SetParamSet(ctx, &params)
+}
+
+// GetAssetParams get asset params from store
+func (k Keeper) GetAssetParams(ctx sdk.Context) types.Assets {
+	var assets types.Assets
+	k.paramstore.Get(ctx, types.KeyAssets, &assets)
+	return assets
+}
+
+// GetOracles returns the oracles in the pricefeed store
+func (k Keeper) GetOracles(ctx sdk.Context, assetCode string) (types.Oracles, error) {
+
+	for _, a := range k.GetAssetParams(ctx) {
+		if assetCode == a.AssetCode {
+			return a.Oracles, nil
+		}
+	}
+	return types.Oracles{}, fmt.Errorf("asset %s not found", assetCode)
+}
+
+// GetOracle returns the oracle from the store or an error if not found
+func (k Keeper) GetOracle(ctx sdk.Context, assetCode string, address sdk.AccAddress) (types.Oracle, error) {
+	oracles, err := k.GetOracles(ctx, assetCode)
+	if err != nil {
+		return types.Oracle{}, fmt.Errorf("asset %s not found", assetCode)
+	}
+	for _, o := range oracles {
+		if address.Equals(o.Address) {
+			return o, nil
+		}
+	}
+	return types.Oracle{}, fmt.Errorf("oracle %s not found for asset %s", address, assetCode)
+}
+
+// GetAsset returns the asset if it is in the pricefeed system
+func (k Keeper) GetAsset(ctx sdk.Context, assetCode string) (types.Asset, bool) {
+	assets := k.GetAssetParams(ctx)
+
+	for i := range assets {
+		if assets[i].AssetCode == assetCode {
+			return assets[i], true
+		}
+	}
+	return types.Asset{}, false
+
+}

x/pricefeed/keeper/querier.go

@@ -1,21 +1,23 @@
-package pricefeed
+package keeper
 
 import (
 	"github.com/cosmos/cosmos-sdk/codec"
 
-	abci "github.com/tendermint/tendermint/abci/types"
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	abci "github.com/tendermint/tendermint/abci/types"
+
+	"github.com/kava-labs/kava/x/pricefeed/types"
 )
 
 // NewQuerier is the module level router for state queries
 func NewQuerier(keeper Keeper) sdk.Querier {
 	return func(ctx sdk.Context, path []string, req abci.RequestQuery) (res []byte, err sdk.Error) {
 		switch path[0] {
-		case QueryCurrentPrice:
+		case types.QueryCurrentPrice:
 			return queryCurrentPrice(ctx, path[1:], req, keeper)
-		case QueryRawPrices:
+		case types.QueryRawPrices:
 			return queryRawPrices(ctx, path[1:], req, keeper)
-		case QueryAssets:
+		case types.QueryAssets:
 			return queryAssets(ctx, req, keeper)
 		default:
 			return nil, sdk.ErrUnknownRequest("unknown pricefeed query endpoint")
@@ -41,7 +43,7 @@ func queryCurrentPrice(ctx sdk.Context, path []string, req abci.RequestQuery, ke
 }
 
 func queryRawPrices(ctx sdk.Context, path []string, req abci.RequestQuery, keeper Keeper) (res []byte, err sdk.Error) {
-	var priceList QueryRawPricesResp
+	var priceList types.QueryRawPricesResp
 	assetCode := path[0]
 	_, found := keeper.GetAsset(ctx, assetCode)
 	if !found {
@@ -60,8 +62,8 @@ func queryRawPrices(ctx sdk.Context, path []string, req abci.RequestQuery, keepe
 }
 
 func queryAssets(ctx sdk.Context, req abci.RequestQuery, keeper Keeper) (res []byte, err sdk.Error) {
-	var assetList QueryAssetsResp
+	var assetList types.QueryAssetsResp
-	assets := keeper.GetAssets(ctx)
+	assets := keeper.GetAssetParams(ctx)
 	for _, asset := range assets {
 		assetList = append(assetList, asset.String())
 	}
@@ -71,4 +73,4 @@ func queryAssets(ctx sdk.Context, req abci.RequestQuery, keeper Keeper) (res []b
 	}
 
 	return bz, nil
-}
+}

x/pricefeed/keeper/test_common.go

@@ -1,4 +1,4 @@
-package pricefeed
+package keeper
 
 import (
 	"testing"
@@ -7,8 +7,9 @@ import (
 	authexported "github.com/cosmos/cosmos-sdk/x/auth/exported"
 	"github.com/cosmos/cosmos-sdk/x/mock"
 	"github.com/stretchr/testify/require"
-	abci "github.com/tendermint/tendermint/abci/types"
 	"github.com/tendermint/tendermint/crypto"
+
+	"github.com/kava-labs/kava/x/pricefeed/types"
 )
 
 type testHelper struct {
@@ -19,16 +20,12 @@ type testHelper struct {
 	privKeys []crypto.PrivKey
 }
 
-func getMockApp(t *testing.T, numGenAccs int, genState GenesisState, genAccs []authexported.Account) testHelper {
+func getMockApp(t *testing.T, numGenAccs int, genState types.GenesisState, genAccs []authexported.Account) testHelper {
 	mApp := mock.NewApp()
-	RegisterCodec(mApp.Cdc)
+	types.RegisterCodec(mApp.Cdc)
-	keyPricefeed := sdk.NewKVStoreKey(StoreKey)
+	keyPricefeed := sdk.NewKVStoreKey(types.StoreKey)
 	pk := mApp.ParamsKeeper
-	keeper := NewKeeper(keyPricefeed, mApp.Cdc, pk.Subspace(DefaultParamspace).WithKeyTable(ParamKeyTable()), DefaultCodespace)
+	keeper := NewKeeper(keyPricefeed, mApp.Cdc, pk.Subspace(types.DefaultParamspace), types.DefaultCodespace)
-
-	// Register routes
-	mApp.Router().AddRoute(RouterKey, NewHandler(keeper))
-	mApp.SetEndBlocker(getEndBlocker(keeper))
 
 	require.NoError(t, mApp.CompleteSetup(keyPricefeed))
 
@@ -47,11 +44,3 @@ func getMockApp(t *testing.T, numGenAccs int, genState GenesisState, genAccs []a
 	mock.SetGenesis(mApp, genAccs)
 	return testHelper{mApp, keeper, addrs, pubKeys, privKeys}
 }
-
-// gov and staking endblocker
-func getEndBlocker(keeper Keeper) sdk.EndBlocker {
-	return func(ctx sdk.Context, req abci.RequestEndBlock) abci.ResponseEndBlock {
-		EndBlocker(ctx, keeper)
-		return abci.ResponseEndBlock{}
-	}
-}

x/pricefeed/keeper_test.go

@@ -1,124 +0,0 @@
-package pricefeed
-
-import (
-	"testing"
-
-	sdk "github.com/cosmos/cosmos-sdk/types"
-	"github.com/stretchr/testify/require"
-	abci "github.com/tendermint/tendermint/abci/types"
-)
-
-// TestKeeper_SetGetAsset tests adding assets to the pricefeed, getting assets from the store
-func TestKeeper_SetGetAsset(t *testing.T) {
-	helper := getMockApp(t, 0, GenesisState{}, nil)
-	header := abci.Header{Height: helper.mApp.LastBlockHeight() + 1}
-	helper.mApp.BeginBlock(abci.RequestBeginBlock{Header: header})
-	ctx := helper.mApp.BaseApp.NewContext(false, abci.Header{})
-	ap := AssetParams{
-		Assets: []Asset{Asset{AssetCode: "tst", Description: "the future of finance"}},
-	}
-	helper.keeper.SetAssetParams(ctx, ap)
-	assets := helper.keeper.GetAssets(ctx)
-	require.Equal(t, len(assets), 1)
-	require.Equal(t, assets[0].AssetCode, "tst")
-
-	_, found := helper.keeper.GetAsset(ctx, "tst")
-	require.Equal(t, found, true)
-
-	ap = AssetParams{
-		Assets: []Asset{
-			Asset{AssetCode: "tst", Description: "the future of finance"},
-			Asset{AssetCode: "tst2", Description: "the future of finance"}},
-	}
-	helper.keeper.SetAssetParams(ctx, ap)
-	assets = helper.keeper.GetAssets(ctx)
-	require.Equal(t, len(assets), 2)
-	require.Equal(t, assets[0].AssetCode, "tst")
-	require.Equal(t, assets[1].AssetCode, "tst2")
-
-	_, found = helper.keeper.GetAsset(ctx, "nan")
-	require.Equal(t, found, false)
-}
-
-// TestKeeper_GetSetPrice Test Posting the price by an oracle
-func TestKeeper_GetSetPrice(t *testing.T) {
-	helper := getMockApp(t, 2, GenesisState{}, nil)
-	header := abci.Header{Height: helper.mApp.LastBlockHeight() + 1}
-	helper.mApp.BeginBlock(abci.RequestBeginBlock{Header: header})
-	ctx := helper.mApp.BaseApp.NewContext(false, abci.Header{})
-	ap := AssetParams{
-		Assets: []Asset{Asset{AssetCode: "tst", Description: "the future of finance"}},
-	}
-	helper.keeper.SetAssetParams(ctx, ap)
-	// Set price by oracle 1
-	_, err := helper.keeper.SetPrice(
-		ctx, helper.addrs[0], "tst",
-		sdk.MustNewDecFromStr("0.33"),
-		sdk.NewInt(10))
-	require.NoError(t, err)
-	// Get raw prices
-	rawPrices := helper.keeper.GetRawPrices(ctx, "tst")
-	require.Equal(t, len(rawPrices), 1)
-	require.Equal(t, rawPrices[0].Price.Equal(sdk.MustNewDecFromStr("0.33")), true)
-	// Set price by oracle 2
-	_, err = helper.keeper.SetPrice(
-		ctx, helper.addrs[1], "tst",
-		sdk.MustNewDecFromStr("0.35"),
-		sdk.NewInt(10))
-	require.NoError(t, err)
-
-	rawPrices = helper.keeper.GetRawPrices(ctx, "tst")
-	require.Equal(t, len(rawPrices), 2)
-	require.Equal(t, rawPrices[1].Price.Equal(sdk.MustNewDecFromStr("0.35")), true)
-
-	// Update Price by Oracle 1
-	_, err = helper.keeper.SetPrice(
-		ctx, helper.addrs[0], "tst",
-		sdk.MustNewDecFromStr("0.37"),
-		sdk.NewInt(10))
-	require.NoError(t, err)
-	rawPrices = helper.keeper.GetRawPrices(ctx, "tst")
-	require.Equal(t, rawPrices[0].Price.Equal(sdk.MustNewDecFromStr("0.37")), true)
-}
-
-// TestKeeper_GetSetCurrentPrice Test Setting the median price of an Asset
-func TestKeeper_GetSetCurrentPrice(t *testing.T) {
-	helper := getMockApp(t, 4, GenesisState{}, nil)
-	header := abci.Header{Height: helper.mApp.LastBlockHeight() + 1}
-	helper.mApp.BeginBlock(abci.RequestBeginBlock{Header: header})
-	ctx := helper.mApp.BaseApp.NewContext(false, abci.Header{})
-	// Odd number of oracles
-	ap := AssetParams{
-		Assets: []Asset{Asset{AssetCode: "tst", Description: "the future of finance"}},
-	}
-	helper.keeper.SetAssetParams(ctx, ap)
-	helper.keeper.SetPrice(
-		ctx, helper.addrs[0], "tst",
-		sdk.MustNewDecFromStr("0.33"),
-		sdk.NewInt(10))
-	helper.keeper.SetPrice(
-		ctx, helper.addrs[1], "tst",
-		sdk.MustNewDecFromStr("0.35"),
-		sdk.NewInt(10))
-	helper.keeper.SetPrice(
-		ctx, helper.addrs[2], "tst",
-		sdk.MustNewDecFromStr("0.34"),
-		sdk.NewInt(10))
-	// Set current price
-	err := helper.keeper.SetCurrentPrices(ctx)
-	require.NoError(t, err)
-	// Get Current price
-	price := helper.keeper.GetCurrentPrice(ctx, "tst")
-	require.Equal(t, price.Price.Equal(sdk.MustNewDecFromStr("0.34")), true)
-
-	// Even number of oracles
-	helper.keeper.SetPrice(
-		ctx, helper.addrs[3], "tst",
-		sdk.MustNewDecFromStr("0.36"),
-		sdk.NewInt(10))
-	err = helper.keeper.SetCurrentPrices(ctx)
-	require.NoError(t, err)
-	price = helper.keeper.GetCurrentPrice(ctx, "tst")
-	require.Equal(t, price.Price.Equal(sdk.MustNewDecFromStr("0.345")), true)
-
-}

x/pricefeed/types/asset.go

@@ -0,0 +1,98 @@
+package types
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+)
+
+// Asset struct that represents an asset in the pricefeed
+type Asset struct {
+	AssetCode  string  `json:"asset_code" yaml:"asset_code"`
+	BaseAsset  string  `json:"base_asset" yaml:"base_asset"`
+	QuoteAsset string  `json:"quote_asset" yaml:"quote_asset"`
+	Oracles    Oracles `json:"oracles" yaml:"oracles"`
+	Active     bool    `json:"active" yaml:"active"`
+}
+
+// implement fmt.Stringer
+func (a Asset) String() string {
+	return fmt.Sprintf(`Asset:
+	Asset Code: %s
+	Base Asset: %s
+	Quote Asset: %s
+	Oracles: %s
+	Active: %t`,
+		a.AssetCode, a.BaseAsset, a.QuoteAsset, a.Oracles, a.Active)
+}
+
+// Assets array type for oracle
+type Assets []Asset
+
+// String implements fmt.Stringer
+func (as Assets) String() string {
+	out := "Assets:\n"
+	for _, a := range as {
+		out += fmt.Sprintf("%s\n", a.String())
+	}
+	return strings.TrimSpace(out)
+}
+
+// Oracle struct that documents which address an oracle is using
+type Oracle struct {
+	Address sdk.AccAddress `json:"address" yaml:"address"`
+}
+
+// String implements fmt.Stringer
+func (o Oracle) String() string {
+	return fmt.Sprintf(`Address: %s`, o.Address)
+}
+
+// Oracles array type for oracle
+type Oracles []Oracle
+
+// String implements fmt.Stringer
+func (os Oracles) String() string {
+	out := "Oracles:\n"
+	for _, o := range os {
+		out += fmt.Sprintf("%s\n", o.String())
+	}
+	return strings.TrimSpace(out)
+}
+
+// CurrentPrice struct that contains the metadata of a current price for a particular asset in the pricefeed module.
+type CurrentPrice struct {
+	AssetCode string  `json:"asset_code" yaml:"asset_code"`
+	Price     sdk.Dec `json:"price" yaml:"price"`
+}
+
+// PostedPrice struct represented a price for an asset posted by a specific oracle
+type PostedPrice struct {
+	AssetCode     string         `json:"asset_code" yaml:"asset_code"`
+	OracleAddress sdk.AccAddress `json:"oracle_address" yaml:"oracle_address"`
+	Price         sdk.Dec        `json:"price" yaml:"price"`
+	Expiry        time.Time      `json:"expiry" yaml:"expiry"`
+}
+
+// implement fmt.Stringer
+func (cp CurrentPrice) String() string {
+	return strings.TrimSpace(fmt.Sprintf(`AssetCode: %s
+Price: %s`, cp.AssetCode, cp.Price))
+}
+
+// implement fmt.Stringer
+func (pp PostedPrice) String() string {
+	return strings.TrimSpace(fmt.Sprintf(`AssetCode: %s
+OracleAddress: %s
+Price: %s
+Expiry: %s`, pp.AssetCode, pp.OracleAddress, pp.Price, pp.Expiry))
+}
+
+// SortDecs provides the interface needed to sort sdk.Dec slices
+type SortDecs []sdk.Dec
+
+func (a SortDecs) Len() int           { return len(a) }
+func (a SortDecs) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
+func (a SortDecs) Less(i, j int) bool { return a[i].LT(a[j]) }

x/pricefeed/types/genesis.go

@@ -2,21 +2,18 @@ package types
 
 import (
 	"bytes"
-	"fmt"
 )
 
 // GenesisState - pricefeed state that must be provided at genesis
 type GenesisState struct {
-	AssetParams  AssetParams   `json:"asset_params" yaml:"asset_params"`
+	Params       Params        `json:"asset_params" yaml:"asset_params"`
-	OracleParams OracleParams  `json:"oracle_params" yaml:"oracle_params"`
 	PostedPrices []PostedPrice `json:"posted_prices" yaml:"posted_prices"`
 }
 
 // NewGenesisState creates a new genesis state for the pricefeed module
-func NewGenesisState(ap AssetParams, op OracleParams, pp []PostedPrice) GenesisState {
+func NewGenesisState(p Params, pp []PostedPrice) GenesisState {
 	return GenesisState{
-		AssetParams:  ap,
+		Params:       p,
-		OracleParams: op,
 		PostedPrices: pp,
 	}
 }
@@ -24,8 +21,7 @@ func NewGenesisState(ap AssetParams, op OracleParams, pp []PostedPrice) GenesisS
 // DefaultGenesisState defines default GenesisState for pricefeed
 func DefaultGenesisState() GenesisState {
 	return NewGenesisState(
-		DefaultAssetParams(),
+		DefaultParams(),
-		DefaultOracleParams(),
 		[]PostedPrice{},
 	)
 }
@@ -45,19 +41,9 @@ func (data GenesisState) IsEmpty() bool {
 // ValidateGenesis performs basic validation of genesis data returning an
 // error for any failed validation criteria.
 func ValidateGenesis(data GenesisState) error {
-	// iterate over assets and verify them
-	for _, asset := range data.AssetParams.Assets {
-		if asset.AssetCode == "" {
-			return fmt.Errorf("invalid asset: %s. missing asset code", asset.String())
-		}
-	}
 
-	// iterate over oracles and verify them
+	if err := data.Params.Validate(); err != nil {
-	for _, oracle := range data.OracleParams.Oracles {
+		return err
-		if oracle.OracleAddress == "" {
-			return fmt.Errorf("invalid oracle: %s. missing oracle address", oracle.String())
-		}
 	}
-
 	return nil
 }

x/pricefeed/types/key.go

@@ -9,4 +9,22 @@ const (
 
 	// RouterKey Top level router key
 	RouterKey = ModuleName
+
+	// QuerierRoute is the querier route for gov
+	QuerierRoute = ModuleName
+
+	// DefaultParamspace default namestore
+	DefaultParamspace = ModuleName
+
+	// RawPriceFeedPrefix prefix for the raw pricefeed of an asset
+	RawPriceFeedPrefix = StoreKey + ":raw:"
+
+	// CurrentPricePrefix prefix for the current price of an asset
+	CurrentPricePrefix = StoreKey + ":currentprice:"
+
+	// AssetPrefix Prefix for the assets in the pricefeed system
+	AssetPrefix = StoreKey + ":assets"
+
+	// OraclePrefix store prefix for the oracle accounts
+	OraclePrefix = StoreKey + ":oracles"
 )

x/pricefeed/types/msgs.go

@@ -1,6 +1,8 @@
 package types
 
 import (
+	"time"
+
 	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
@@ -15,7 +17,7 @@ type MsgPostPrice struct {
 	From      sdk.AccAddress // client that sent in this address
 	AssetCode string         // asset code used by exchanges/api
 	Price     sdk.Dec        // price in decimal (max precision 18)
-	Expiry    sdk.Int        // block height
+	Expiry    time.Time      // expiry time
 }
 
 // NewMsgPostPrice creates a new post price msg
@@ -23,7 +25,7 @@ func NewMsgPostPrice(
 	from sdk.AccAddress,
 	assetCode string,
 	price sdk.Dec,
-	expiry sdk.Int) MsgPostPrice {
+	expiry time.Time) MsgPostPrice {
 	return MsgPostPrice{
 		From:      from,
 		AssetCode: assetCode,
@@ -60,9 +62,6 @@ func (msg MsgPostPrice) ValidateBasic() sdk.Error {
 	if msg.Price.LT(sdk.ZeroDec()) {
 		return sdk.ErrInternal("invalid (negative) price")
 	}
-	if msg.Expiry.LT(sdk.ZeroInt()) {
-		return sdk.ErrInternal("invalid (negative) expiry")
-	}
 	// TODO check coin denoms
 	return nil
 }

x/pricefeed/types/msgs_test.go

@@ -5,6 +5,7 @@ import (
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/stretchr/testify/require"
+	tmtime "github.com/tendermint/tendermint/types/time"
 )
 
 func TestMsgPlaceBid_ValidateBasic(t *testing.T) {
@@ -13,8 +14,7 @@ func TestMsgPlaceBid_ValidateBasic(t *testing.T) {
 	// 	OracleAddress: addr.String(),
 	// }}
 	price, _ := sdk.NewDecFromStr("0.3005")
-	expiry, _ := sdk.NewIntFromString("10")
+	expiry := tmtime.Now()
-	negativeExpiry, _ := sdk.NewIntFromString("-3")
 	negativePrice, _ := sdk.NewDecFromStr("-3.05")
 
 	tests := []struct {
@@ -26,7 +26,6 @@ func TestMsgPlaceBid_ValidateBasic(t *testing.T) {
 		{"emptyAddr", MsgPostPrice{sdk.AccAddress{}, "xrp", price, expiry}, false},
 		{"emptyAsset", MsgPostPrice{addr, "", price, expiry}, false},
 		{"negativePrice", MsgPostPrice{addr, "xrp", negativePrice, expiry}, false},
-		{"negativeExpiry", MsgPostPrice{addr, "xrp", price, negativeExpiry}, false},
 	}
 	for _, tc := range tests {
 		t.Run(tc.name, func(t *testing.T) {

x/pricefeed/types/params.go

@@ -8,74 +8,48 @@ import (
 	params "github.com/cosmos/cosmos-sdk/x/params/subspace"
 )
 
-// Parameter store key
 var (
-	// ParamStoreKeyOracles Param store key for oracles
+	// KeyAssets store key for assets
-	ParamStoreKeyOracles = []byte("oracles")
+	KeyAssets = []byte("assets")
-	// ParamStoreKeyAssets Param store key for assets
-	ParamStoreKeyAssets = []byte("assets")
 )
 
 // ParamKeyTable Key declaration for parameters
 func ParamKeyTable() params.KeyTable {
-	return params.NewKeyTable(
+	return params.NewKeyTable().RegisterParamSet(&Params{})
-		ParamStoreKeyOracles, OracleParams{},
-		ParamStoreKeyAssets, AssetParams{},
-	)
 }
 
-// AssetParams params for assets. Can be altered via governance
+// Params params for pricefeed. Can be altered via governance
-type AssetParams struct {
+type Params struct {
-	Assets []Asset `json:"assets,omitempty" yaml:"assets,omitempty"` //  Array containing the assets supported by the pricefeed
+	Assets []Asset `json:"assets" yaml:"assets"` //  Array containing the assets supported by the pricefeed
 }
 
-// NewAssetParams creates a new AssetParams object
+// ParamSetPairs implements the ParamSet interface and returns all the key/value pairs
-func NewAssetParams(assets []Asset) AssetParams {
+// pairs of pricefeed module's parameters.
-	return AssetParams{
+func (p Params) ParamSetPairs() params.ParamSetPairs {
+	return params.ParamSetPairs{
+		{Key: KeyAssets, Value: &p.Assets},
+	}
+}
+
+// NewParams creates a new AssetParams object
+func NewParams(assets []Asset) Params {
+	return Params{
 		Assets: assets,
 	}
 }
 
-// DefaultAssetParams default params for assets
+// DefaultParams default params for pricefeed
-func DefaultAssetParams() AssetParams {
+func DefaultParams() Params {
-	return NewAssetParams([]Asset{})
+	return NewParams(Assets{})
 }
 
-// implements fmt.stringer
+// String implements fmt.stringer
-func (ap AssetParams) String() string {
+func (p Params) String() string {
-	var assetListString []string
+	out := "Params:\n"
-	for _, asset := range ap.Assets {
+	for _, a := range p.Assets {
-		assetListString = append(assetListString, asset.String())
+		out += a.String()
 	}
-	return strings.TrimSpace(fmt.Sprintf(`Asset Params:
+	return strings.TrimSpace(out)
-	Assets:        %s\`, strings.Join(assetListString, ", ")))
-}
-
-// OracleParams params for assets. Can be altered via governance
-type OracleParams struct {
-	Oracles []Oracle `json:"oracles,omitempty" yaml:"oracles,omitempty"` //  Array containing the oracles supported by the pricefeed
-}
-
-// NewOracleParams creates a new OracleParams object
-func NewOracleParams(oracles []Oracle) OracleParams {
-	return OracleParams{
-		Oracles: oracles,
-	}
-}
-
-// DefaultOracleParams default params for assets
-func DefaultOracleParams() OracleParams {
-	return NewOracleParams([]Oracle{})
-}
-
-// implements fmt.stringer
-func (op OracleParams) String() string {
-	var oracleListString []string
-	for _, oracle := range op.Oracles {
-		oracleListString = append(oracleListString, oracle.String())
-	}
-	return strings.TrimSpace(fmt.Sprintf(`Oracle Params:
-  Oracles:        %s\`, strings.Join(oracleListString, ", ")))
 }
 
 // ParamSubspace defines the expected Subspace interface for parameters
@@ -83,3 +57,14 @@ type ParamSubspace interface {
 	Get(ctx sdk.Context, key []byte, ptr interface{})
 	Set(ctx sdk.Context, key []byte, param interface{})
 }
+
+// Validate ensure that params have valid values
+func (p Params) Validate() error {
+	// iterate over assets and verify them
+	for _, asset := range p.Assets {
+		if asset.AssetCode == "" {
+			return fmt.Errorf("invalid asset: %s. missing asset code", asset.String())
+		}
+	}
+	return nil
+}

x/pricefeed/types/types.go

@@ -1,67 +0,0 @@
-package types
-
-import (
-	"fmt"
-	"strings"
-
-	sdk "github.com/cosmos/cosmos-sdk/types"
-)
-
-// Asset struct that represents an asset in the pricefeed
-type Asset struct {
-	AssetCode   string `json:"asset_code"`
-	Description string `json:"description"`
-}
-
-// implement fmt.Stringer
-func (a Asset) String() string {
-	return strings.TrimSpace(fmt.Sprintf(`AssetCode: %s
-Description: %s`, a.AssetCode, a.Description))
-}
-
-// Oracle struct that documents which address an oracle is using
-type Oracle struct {
-	OracleAddress string `json:"oracle_address"`
-}
-
-// implement fmt.Stringer
-func (o Oracle) String() string {
-	return strings.TrimSpace(fmt.Sprintf(`OracleAddress: %s`, o.OracleAddress))
-}
-
-// CurrentPrice struct that contains the metadata of a current price for a particular asset in the pricefeed module.
-type CurrentPrice struct {
-	AssetCode string  `json:"asset_code"`
-	Price     sdk.Dec `json:"price"`
-	Expiry    sdk.Int `json:"expiry"`
-}
-
-// PostedPrice struct represented a price for an asset posted by a specific oracle
-type PostedPrice struct {
-	AssetCode     string  `json:"asset_code"`
-	OracleAddress string  `json:"oracle_address"`
-	Price         sdk.Dec `json:"price"`
-	Expiry        sdk.Int `json:"expiry"`
-}
-
-// implement fmt.Stringer
-func (cp CurrentPrice) String() string {
-	return strings.TrimSpace(fmt.Sprintf(`AssetCode: %s
-Price: %s
-Expiry: %s`, cp.AssetCode, cp.Price, cp.Expiry))
-}
-
-// implement fmt.Stringer
-func (pp PostedPrice) String() string {
-	return strings.TrimSpace(fmt.Sprintf(`AssetCode: %s
-OracleAddress: %s
-Price: %s
-Expiry: %s`, pp.AssetCode, pp.OracleAddress, pp.Price, pp.Expiry))
-}
-
-// SortDecs provides the interface needed to sort sdk.Dec slices
-type SortDecs []sdk.Dec
-
-func (a SortDecs) Len() int           { return len(a) }
-func (a SortDecs) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
-func (a SortDecs) Less(i, j int) bool { return a[i].LT(a[j]) }