chain: Add price_symbols endpoint

CHANGELOG_UNRELEASED.md

@@ -12,6 +12,7 @@
 
 ### Chain (Non-consensus)
 
+- (feat) [\#2829](https://github.com/bandprotocol/bandchain/pull/2829) Added `price_symbols` endpoint
 - (bugs) [\#2828](https://github.com/bandprotocol/bandchain/pull/2828) Add missing height on `multi_request_search` and `request_prices` endpoints
 - (impv) [\#2746](https://github.com/bandprotocol/bandchain/pull/2746) Implemented emitter, price, and latest request hooks
 - (impv) [\#2789](https://github.com/bandprotocol/bandchain/pull/2789) Added `bandchain/chain_id` endpoint

chain/hooks/price/price.go

@@ -8,6 +8,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/codec"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/syndtr/goleveldb/leveldb"
+	"github.com/syndtr/goleveldb/leveldb/util"
 	abci "github.com/tendermint/tendermint/abci/types"
 
 	"github.com/bandprotocol/bandchain/chain/hooks/common"
@@ -74,7 +75,8 @@ func (h *Hook) AfterEndBlock(ctx sdk.Context, req abci.RequestEndBlock, res abci
 					obi.MustDecode(result.ResponsePacketData.Result, &output)
 					for idx, symbol := range input.Symbols {
 						price := NewPrice(symbol, input.Multiplier, output.Pxs[idx], result.ResponsePacketData.RequestID, result.ResponsePacketData.ResolveTime)
-						err := h.db.Put([]byte(fmt.Sprintf("%s,%d,%d", symbol, result.RequestPacketData.AskCount, result.RequestPacketData.MinCount)), h.cdc.MustMarshalBinaryBare(price), nil)
+						err := h.db.Put([]byte(fmt.Sprintf("%d,%d,%s", result.RequestPacketData.AskCount, result.RequestPacketData.MinCount, symbol)),
+							h.cdc.MustMarshalBinaryBare(price), nil)
 						if err != nil {
 							panic(err)
 						}
@@ -99,14 +101,36 @@ func (h *Hook) ApplyQuery(req abci.RequestQuery) (res abci.ResponseQuery, stop b
 			symbol := paths[2]
 			askCount := common.Atoui(paths[3])
 			minCount := common.Atoui(paths[4])
-			bz, err := h.db.Get([]byte(fmt.Sprintf("%s,%d,%d", symbol, askCount, minCount)), nil)
+			bz, err := h.db.Get([]byte(fmt.Sprintf("%d,%d,%s", askCount, minCount, symbol)), nil)
 			if err != nil {
 				return common.QueryResultError(fmt.Errorf(
 					"Cannot get price of %s with %d/%d counts with error: %s",
 					symbol, minCount, askCount, err.Error(),
 				)), true
 			}
 			return common.QueryResultSuccess(bz, req.Height), true
+		case "price_symbols":
+			if len(paths) < 4 {
+				return common.QueryResultError(errors.New("no route for symbol prices query specified")), true
+			}
+			askCount := common.Atoui(paths[2])
+			minCount := common.Atoui(paths[3])
+
+			prefix := []byte(fmt.Sprintf("%d,%d,", askCount, minCount))
+			it := h.db.NewIterator(util.BytesPrefix(prefix), nil)
+
+			symbols := []string{}
+			for it.Next() {
+				symbols = append(symbols, string(it.Key()[len(prefix):]))
+			}
+
+			it.Release()
+			if err := it.Error(); err != nil {
+				return common.QueryResultError(fmt.Errorf("Error while iterate over prices list: %s", err.Error())), true
+			}
+
+			bz := h.cdc.MustMarshalBinaryBare(symbols)
+			return common.QueryResultSuccess(bz, req.Height), true
 		default:
 			return abci.ResponseQuery{}, false
 		}

chain/x/oracle/client/rest/query.go

@@ -173,6 +173,31 @@ func getRequestsPricesHandler(cliCtx context.CLIContext, route string) http.Hand
 	}
 }
 
+func getRequestsPriceSymbolsHandler(cliCtx context.CLIContext, route string) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		cliCtx, ok := rest.ParseQueryHeightOrReturnBadRequest(w, cliCtx, r)
+		if !ok {
+			return
+		}
+
+		bz, height, err := cliCtx.Query(fmt.Sprintf("band/price_symbols/%s/%s", r.FormValue("ask_count"), r.FormValue("min_count")))
+
+		var symbols []string
+		if err := cliCtx.Codec.UnmarshalBinaryBare(bz, &symbols); err != nil {
+			rest.WriteErrorResponse(w, http.StatusInternalServerError, err.Error())
+			return
+		}
+
+		bz, err = types.QueryOK(symbols)
+		if err != nil {
+			rest.WriteErrorResponse(w, http.StatusInternalServerError, err.Error())
+			return
+		}
+
+		clientcmn.PostProcessQueryResponse(w, cliCtx.WithHeight(height), bz)
+	}
+}
+
 func getMultiRequestSearchHandler(cliCtx context.CLIContext, route string) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		cliCtx, ok := rest.ParseQueryHeightOrReturnBadRequest(w, cliCtx, r)

chain/x/oracle/client/rest/rest.go

@@ -24,6 +24,7 @@ func RegisterRoutes(cliCtx context.CLIContext, r *mux.Router, storeName string)
 	r.HandleFunc(fmt.Sprintf("/%s/requests/{%s}", storeName, idTag), getRequestByIDHandler(cliCtx, storeName)).Methods("GET")
 	r.HandleFunc(fmt.Sprintf("/%s/request_search", storeName), getRequestSearchHandler(cliCtx, storeName)).Methods("GET")
 	r.HandleFunc(fmt.Sprintf("/%s/request_prices", storeName), getRequestsPricesHandler(cliCtx, storeName)).Methods("POST")
+	r.HandleFunc(fmt.Sprintf("/%s/price_symbols", storeName), getRequestsPriceSymbolsHandler(cliCtx, storeName)).Methods("GET")
 	r.HandleFunc(fmt.Sprintf("/%s/multi_request_search", storeName), getMultiRequestSearchHandler(cliCtx, storeName)).Methods("GET")
 	r.HandleFunc(fmt.Sprintf("/%s/validators/{%s}", storeName, validatorAddressTag), getValidatorStatusHandler(cliCtx, storeName)).Methods("GET")
 	r.HandleFunc(fmt.Sprintf("/%s/reporters/{%s}", storeName, validatorAddressTag), getReportersHandler(cliCtx, storeName)).Methods("GET")