rpc: add decimals/name/symbol data to getNEPXXBalance

See neo-project/neo-modules#738 and neo-project/neo-modules#741.

pkg/rpc/client/rpc_test.go

@@ -543,7 +543,7 @@ var rpcClientTestCases = map[string][]rpcClientTestCase{
 				}
 				return c.GetNEP11Balances(hash)
 			},
-			serverResponse: `{"jsonrpc":"2.0","id":1,"result":{"balance":[{"assethash":"a48b6e1291ba24211ad11bb90ae2a10bf1fcd5a8","tokens":[{"tokenid":"abcdef","amount":"1","lastupdatedblock":251604}]}],"address":"NcEkNmgWmf7HQVQvzhxpengpnt4DXjmZLe"}}`,
+			serverResponse: `{"jsonrpc":"2.0","id":1,"result":{"balance":[{"assethash":"a48b6e1291ba24211ad11bb90ae2a10bf1fcd5a8","symbol":"SOME","decimals":"42","name":"Contract","tokens":[{"tokenid":"abcdef","amount":"1","lastupdatedblock":251604}]}],"address":"NcEkNmgWmf7HQVQvzhxpengpnt4DXjmZLe"}}`,
 			result: func(c *Client) interface{} {
 				hash, err := util.Uint160DecodeStringLE("a48b6e1291ba24211ad11bb90ae2a10bf1fcd5a8")
 				if err != nil {
@@ -552,6 +552,9 @@ var rpcClientTestCases = map[string][]rpcClientTestCase{
 				return &result.NEP11Balances{
 					Balances: []result.NEP11AssetBalance{{
 						Asset:    hash,
+						Decimals: 42,
+						Name:     "Contract",
+						Symbol:   "SOME",
 						Tokens: []result.NEP11TokenBalance{{
 							ID:          "abcdef",
 							Amount:      "1",
@@ -573,7 +576,7 @@ var rpcClientTestCases = map[string][]rpcClientTestCase{
 				}
 				return c.GetNEP17Balances(hash)
 			},
-			serverResponse: `{"jsonrpc":"2.0","id":1,"result":{"balance":[{"assethash":"a48b6e1291ba24211ad11bb90ae2a10bf1fcd5a8","amount":"50000000000","lastupdatedblock":251604}],"address":"AY6eqWjsUFCzsVELG7yG72XDukKvC34p2w"}}`,
+			serverResponse: `{"jsonrpc":"2.0","id":1,"result":{"balance":[{"assethash":"a48b6e1291ba24211ad11bb90ae2a10bf1fcd5a8","symbol":"N17","decimals":"8","name":"Token","amount":"50000000000","lastupdatedblock":251604}],"address":"AY6eqWjsUFCzsVELG7yG72XDukKvC34p2w"}}`,
 			result: func(c *Client) interface{} {
 				hash, err := util.Uint160DecodeStringLE("a48b6e1291ba24211ad11bb90ae2a10bf1fcd5a8")
 				if err != nil {
@@ -582,6 +585,9 @@ var rpcClientTestCases = map[string][]rpcClientTestCase{
 				return &result.NEP17Balances{
 					Balances: []result.NEP17Balance{{
 						Asset:       hash,
+						Decimals:    8,
+						Name:        "Token",
+						Symbol:      "N17",
 						Amount:      "50000000000",
 						LastUpdated: 251604,
 					}},

pkg/rpc/response/result/tokens.go

@@ -13,6 +13,9 @@ type NEP11Balances struct {
 // NEP11Balance is a structure holding balance of a NEP-11 asset.
 type NEP11AssetBalance struct {
 	Asset    util.Uint160        `json:"assethash"`
+	Decimals int                 `json:"decimals,string"`
+	Name     string              `json:"name"`
+	Symbol   string              `json:"symbol"`
 	Tokens   []NEP11TokenBalance `json:"tokens"`
 }
 
@@ -33,7 +36,10 @@ type NEP17Balances struct {
 type NEP17Balance struct {
 	Asset       util.Uint160 `json:"assethash"`
 	Amount      string       `json:"amount"`
+	Decimals    int          `json:"decimals,string"`
 	LastUpdated uint32       `json:"lastupdatedblock"`
+	Name        string       `json:"name"`
+	Symbol      string       `json:"symbol"`
 }
 
 // NEP11Transfers is a result for the getnep11transfers RPC.

pkg/rpc/server/server.go

@@ -677,17 +677,28 @@ func (s *Server) getApplicationLog(reqParams request.Params) (interface{}, *resp
 	return result.NewApplicationLog(hash, appExecResults, trig), nil
 }
 
-func (s *Server) getNEP11Tokens(h util.Uint160, acc util.Uint160, bw *io.BufBinWriter) ([]stackitem.Item, error) {
+func (s *Server) getNEP11Tokens(h util.Uint160, acc util.Uint160, bw *io.BufBinWriter) ([]stackitem.Item, string, int, error) {
-	item, finalize, err := s.invokeReadOnly(bw, h, "tokensOf", acc)
+	items, finalize, err := s.invokeReadOnlyMulti(bw, h, []string{"tokensOf", "symbol", "decimals"}, [][]interface{}{{acc}, nil, nil})
 	if err != nil {
-		return nil, err
+		return nil, "", 0, err
 	}
 	defer finalize()
-	if (item.Type() == stackitem.InteropT) && iterator.IsIterator(item) {
+	if (items[0].Type() != stackitem.InteropT) || !iterator.IsIterator(items[0]) {
-		vals, _ := iterator.Values(item, s.config.MaxNEP11Tokens)
+		return nil, "", 0, fmt.Errorf("invalid `tokensOf` result type %s", items[0].String())
-		return vals, nil
 	}
-	return nil, fmt.Errorf("invalid `tokensOf` result type %s", item.String())
+	vals, _ := iterator.Values(items[0], s.config.MaxNEP11Tokens)
+	sym, err := stackitem.ToString(items[1])
+	if err != nil {
+		return nil, "", 0, fmt.Errorf("`symbol` return value error: %w", err)
+	}
+	dec, err := items[2].TryInteger()
+	if err != nil {
+		return nil, "", 0, fmt.Errorf("`decimals` return value error: %w", err)
+	}
+	if !dec.IsInt64() || dec.Sign() == -1 || dec.Int64() > math.MaxInt32 {
+		return nil, "", 0, errors.New("`decimals` returned a bad integer")
+	}
+	return vals, sym, int(dec.Int64()), nil
 }
 
 func (s *Server) getNEP11Balances(ps request.Params) (interface{}, *response.Error) {
@@ -709,7 +720,7 @@ func (s *Server) getNEP11Balances(ps request.Params) (interface{}, *response.Err
 	bw := io.NewBufBinWriter()
 contract_loop:
 	for _, h := range s.chain.GetNEP11Contracts() {
-		toks, err := s.getNEP11Tokens(h, u, bw)
+		toks, sym, dec, err := s.getNEP11Tokens(h, u, bw)
 		if err != nil {
 			continue
 		}
@@ -731,6 +742,9 @@ contract_loop:
 		}
 		bs.Balances = append(bs.Balances, result.NEP11AssetBalance{
 			Asset:    h,
+			Decimals: dec,
+			Name:     cs.Manifest.Name,
+			Symbol:   sym,
 			Tokens:   make([]result.NEP11TokenBalance, 0, len(toks)),
 		})
 		curAsset := &bs.Balances[len(bs.Balances)-1]
@@ -741,7 +755,7 @@ contract_loop:
 			}
 			var amount = "1"
 			if isDivisible {
-				balance, err := s.getTokenBalance(h, u, id, bw)
+				balance, err := s.getNEP11DTokenBalance(h, u, id, bw)
 				if err != nil {
 					continue
 				}
@@ -829,7 +843,7 @@ func (s *Server) getNEP17Balances(ps request.Params) (interface{}, *response.Err
 	stateSyncPoint := lastUpdated[math.MinInt32]
 	bw := io.NewBufBinWriter()
 	for _, h := range s.chain.GetNEP17Contracts() {
-		balance, err := s.getTokenBalance(h, u, nil, bw)
+		balance, sym, dec, err := s.getNEP17TokenBalance(h, u, bw)
 		if err != nil {
 			continue
 		}
@@ -851,21 +865,37 @@ func (s *Server) getNEP17Balances(ps request.Params) (interface{}, *response.Err
 		bs.Balances = append(bs.Balances, result.NEP17Balance{
 			Asset:       h,
 			Amount:      balance.String(),
+			Decimals:    dec,
 			LastUpdated: lub,
+			Name:        cs.Manifest.Name,
+			Symbol:      sym,
 		})
 	}
 	return bs, nil
 }
 
 func (s *Server) invokeReadOnly(bw *io.BufBinWriter, h util.Uint160, method string, params ...interface{}) (stackitem.Item, func(), error) {
+	r, f, err := s.invokeReadOnlyMulti(bw, h, []string{method}, [][]interface{}{params})
+	if err != nil {
+		return nil, nil, err
+	}
+	return r[0], f, nil
+}
+
+func (s *Server) invokeReadOnlyMulti(bw *io.BufBinWriter, h util.Uint160, methods []string, params [][]interface{}) ([]stackitem.Item, func(), error) {
 	if bw == nil {
 		bw = io.NewBufBinWriter()
 	} else {
 		bw.Reset()
 	}
-	emit.AppCall(bw.BinWriter, h, method, callflag.ReadStates|callflag.AllowCall, params...)
+	if len(methods) != len(params) {
+		return nil, nil, fmt.Errorf("asymmetric parameters")
+	}
+	for i := range methods {
+		emit.AppCall(bw.BinWriter, h, methods[i], callflag.ReadStates|callflag.AllowCall, params[i]...)
 		if bw.Err != nil {
-		return nil, nil, fmt.Errorf("failed to create `%s` invocation script: %w", method, bw.Err)
+			return nil, nil, fmt.Errorf("failed to create `%s` invocation script: %w", methods[i], bw.Err)
+		}
 	}
 	script := bw.Bytes()
 	tx := &transaction.Transaction{Script: script}
@@ -879,26 +909,42 @@ func (s *Server) invokeReadOnly(bw *io.BufBinWriter, h util.Uint160, method stri
 	err = ic.VM.Run()
 	if err != nil {
 		ic.Finalize()
-		return nil, nil, fmt.Errorf("failed to run `%s` for %s: %w", method, h.StringLE(), err)
+		return nil, nil, fmt.Errorf("failed to run %d methods of %s: %w", len(methods), h.StringLE(), err)
 	}
-	if ic.VM.Estack().Len() != 1 {
+	estack := ic.VM.Estack()
+	if estack.Len() != len(methods) {
 		ic.Finalize()
-		return nil, nil, fmt.Errorf("invalid `%s` return values count: expected 1, got %d", method, ic.VM.Estack().Len())
+		return nil, nil, fmt.Errorf("invalid return values count: expected %d, got %d", len(methods), estack.Len())
 	}
-	return ic.VM.Estack().Pop().Item(), ic.Finalize, nil
+	return estack.ToArray(), ic.Finalize, nil
 }
 
-func (s *Server) getTokenBalance(h util.Uint160, acc util.Uint160, id []byte, bw *io.BufBinWriter) (*big.Int, error) {
+func (s *Server) getNEP17TokenBalance(h util.Uint160, acc util.Uint160, bw *io.BufBinWriter) (*big.Int, string, int, error) {
-	var (
+	items, finalize, err := s.invokeReadOnlyMulti(bw, h, []string{"balanceOf", "symbol", "decimals"}, [][]interface{}{{acc}, nil, nil})
-		item     stackitem.Item
+	if err != nil {
-		finalize func()
+		return nil, "", 0, err
-		err      error
-	)
-	if id == nil { // NEP-17 and NEP-11 generic.
-		item, finalize, err = s.invokeReadOnly(bw, h, "balanceOf", acc)
-	} else { // NEP-11 divisible.
-		item, finalize, err = s.invokeReadOnly(bw, h, "balanceOf", acc, id)
 	}
+	finalize()
+	res, err := items[0].TryInteger()
+	if err != nil {
+		return nil, "", 0, fmt.Errorf("unexpected `balanceOf` result type: %w", err)
+	}
+	sym, err := stackitem.ToString(items[1])
+	if err != nil {
+		return nil, "", 0, fmt.Errorf("`symbol` return value error: %w", err)
+	}
+	dec, err := items[2].TryInteger()
+	if err != nil {
+		return nil, "", 0, fmt.Errorf("`decimals` return value error: %w", err)
+	}
+	if !dec.IsInt64() || dec.Sign() == -1 || dec.Int64() > math.MaxInt32 {
+		return nil, "", 0, errors.New("`decimals` returned a bad integer")
+	}
+	return res, sym, int(dec.Int64()), nil
+}
+
+func (s *Server) getNEP11DTokenBalance(h util.Uint160, acc util.Uint160, id []byte, bw *io.BufBinWriter) (*big.Int, error) {
+	item, finalize, err := s.invokeReadOnly(bw, h, "balanceOf", acc, id)
 	if err != nil {
 		return nil, err
 	}

pkg/rpc/server/server_test.go

@@ -2429,6 +2429,8 @@ func checkNep11Balances(t *testing.T, e *executor, acc interface{}) {
 		Balances: []result.NEP11AssetBalance{
 			{
 				Asset:  nnsHash,
+				Name:   "NameService",
+				Symbol: "NNS",
 				Tokens: []result.NEP11TokenBalance{
 					{
 						ID:          nnsToken1ID,
@@ -2439,6 +2441,9 @@ func checkNep11Balances(t *testing.T, e *executor, acc interface{}) {
 			},
 			{
 				Asset:    nfsoHash,
+				Decimals: 2,
+				Name:     "NeoFS Object NFT",
+				Symbol:   "NFSO",
 				Tokens: []result.NEP11TokenBalance{
 					{
 						ID:          nfsoToken1ID,
@@ -2464,17 +2469,25 @@ func checkNep17Balances(t *testing.T, e *executor, acc interface{}) {
 			{
 				Asset:       rubles,
 				Amount:      "877",
+				Decimals:    2,
 				LastUpdated: 6,
+				Name:        "Rubl",
+				Symbol:      "RUB",
 			},
 			{
 				Asset:       e.chain.GoverningTokenHash(),
 				Amount:      "99998000",
 				LastUpdated: 4,
+				Name:        "NeoToken",
+				Symbol:      "NEO",
 			},
 			{
 				Asset:       e.chain.UtilityTokenHash(),
 				Amount:      "47102199200",
+				Decimals:    8,
 				LastUpdated: 19,
+				Name:        "GasToken",
+				Symbol:      "GAS",
 			}},
 		Address: testchain.PrivateKeyByID(0).GetScriptHash().StringLE(),
 	}