chore: changed field multiplier to decimals in asset type

Author: ironman0x7b2

proto/sentinel/oracle/v1/asset.proto

@@ -9,10 +9,7 @@ option (gogoproto.goproto_getters_all) = false;
 
 message Asset {
   string denom = 1;
-  string multiplier = 2 [
-    (gogoproto.customtype) = "cosmossdk.io/math.Int",
-    (gogoproto.nullable) = false
-  ];
+  int64 decimals = 2;
   uint64 pool_id = 3 [(gogoproto.customname) = "PoolID"];
   string base_asset_denom = 4;
   string quote_asset_denom = 5;

x/oracle/keeper/relay.go

@@ -100,7 +100,7 @@ func (k *Keeper) processSpotPriceResponse(ctx sdk.Context, portID, channelID str
 		return err
 	}
 
-	asset.Price = spotPrice.MulInt(asset.Multiplier).TruncateInt()
+	asset.Price = spotPrice.MulInt(asset.Exponent()).TruncateInt()
 	k.SetAsset(ctx, asset)
 
 	return nil

x/oracle/types/v1/asset.go

@@ -1,8 +1,12 @@
 package v1
 
 import (
+	sdkmath "cosmossdk.io/math"
+	"errors"
 	abcitypes "github.com/cometbft/cometbft/abci/types"
 	"github.com/cosmos/cosmos-sdk/codec"
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	"math/big"
 
 	"github.com/sentinel-official/hub/v12/third_party/osmosis/x/poolmanager/client/queryproto"
 	protorevtypes "github.com/sentinel-official/hub/v12/third_party/osmosis/x/protorev/types"
@@ -32,3 +36,28 @@ func (a *Asset) SpotPriceRequest(cdc codec.Codec) abcitypes.RequestQuery {
 		Path: "/osmosis.poolmanager.v1beta1.Query/SpotPrice",
 	}
 }
+
+func (a *Asset) Exponent() sdkmath.Int {
+	i := new(big.Int).Exp(big.NewInt(10), big.NewInt(a.Decimals), nil)
+	return sdkmath.NewIntFromBigInt(i)
+}
+
+func (a *Asset) Validate() error {
+	if err := sdk.ValidateDenom(a.Denom); err != nil {
+		return err
+	}
+	if a.Decimals < 0 {
+		return errors.New("decimals must be non-negative")
+	}
+	if len(a.BaseAssetDenom) == 0 {
+		return errors.New("base_asset_denom cannot be empty")
+	}
+	if len(a.QuoteAssetDenom) == 0 {
+		return errors.New("quote_asset_denom cannot be empty")
+	}
+	if a.BaseAssetDenom == a.QuoteAssetDenom {
+		return errors.New("base_asset_denom and quote_asset_denom must be different")
+	}
+
+	return nil
+}