rpc: implement gettransactionheight

closes #713

docs/rpc.md

@@ -53,7 +53,7 @@ which would yield the response:
 | `getrawmempool` | Yes |
 | `getrawtransaction` | Yes |
 | `getstorage` | Yes |
-| `gettransactionheight` | No (#713) |
+| `gettransactionheight` | Yes |
 | `gettxout` | Yes |
 | `getunclaimed` | No (#712) |
 | `getunspents` | Yes |

pkg/rpc/server/prometheus.go

@@ -147,6 +147,14 @@ var (
 		},
 	)
 
+	gettransactionheightCalled = prometheus.NewCounter(
+		prometheus.CounterOpts{
+			Help:      "Number of calls to gettransactionheight rpc endpoint",
+			Name:      "gettransactionheight_called",
+			Namespace: "neogo",
+		},
+	)
+
 	gettxoutCalled = prometheus.NewCounter(
 		prometheus.CounterOpts{
 			Help:      "Number of calls to gettxout rpc endpoint",
@@ -206,6 +214,7 @@ func init() {
 		getassetstateCalled,
 		getaccountstateCalled,
 		getunspentsCalled,
+		gettransactionheightCalled,
 		gettxoutCalled,
 		getrawtransactionCalled,
 		sendrawtransactionCalled,

pkg/rpc/server/server.go

@@ -285,6 +285,10 @@ Methods:
 		getrawtransactionCalled.Inc()
 		results, resultsErr = s.getrawtransaction(reqParams)
 
+	case "gettransactionheight":
+		gettransactionheightCalled.Inc()
+		results, resultsErr = s.getTransactionHeight(reqParams)
+
 	case "gettxout":
 		gettxoutCalled.Inc()
 		results, resultsErr = s.getTxOut(reqParams)
@@ -589,6 +593,25 @@ func (s *Server) getrawtransaction(reqParams request.Params) (interface{}, error
 	return results, resultsErr
 }
 
+func (s *Server) getTransactionHeight(ps request.Params) (interface{}, error) {
+	p, ok := ps.Value(0)
+	if !ok {
+		return nil, response.ErrInvalidParams
+	}
+
+	h, err := p.GetUint256()
+	if err != nil {
+		return nil, response.ErrInvalidParams
+	}
+
+	_, height, err := s.chain.GetTransaction(h)
+	if err != nil {
+		return nil, response.NewRPCError("unknown transaction", "", nil)
+	}
+
+	return height, nil
+}
+
 func (s *Server) getTxOut(ps request.Params) (interface{}, error) {
 	p, ok := ps.Value(0)
 	if !ok {

pkg/rpc/server/server_test.go

@@ -576,6 +576,31 @@ var rpcTestCases = map[string][]rpcTestCase{
 			fail:   true,
 		},
 	},
+	"gettransactionheight": {
+		{
+			name:   "poositive",
+			params: `["3fee783413c27849c8ee2656fd757a7483de64f4e78bd7897f30ecdf42ce788b"]`,
+			result: func(e *executor) interface{} {
+				h := 202
+				return &h
+			},
+		},
+		{
+			name:   "no params",
+			params: `[]`,
+			fail:   true,
+		},
+		{
+			name:   "invalid hash",
+			params: `["notahex"]`,
+			fail:   true,
+		},
+		{
+			name:   "missing hash",
+			params: `["` + util.Uint256{}.String() + `"]`,
+			fail:   true,
+		},
+	},
 	"getunspents": {
 		{
 			name:   "positive",