rpc/client: implement GetNativeContracts

pkg/rpc/client/rpc.go

@@ -240,6 +240,18 @@ func (c *Client) getContractState(param interface{}) (*state.Contract, error) {
 	return resp, nil
 }
 
+// GetNativeContracts queries information about native contracts.
+func (c *Client) GetNativeContracts() ([]state.NativeContract, error) {
+	var (
+		params = request.NewRawParams()
+		resp   []state.NativeContract
+	)
+	if err := c.performRequest("getnativecontracts", params, &resp); err != nil {
+		return resp, err
+	}
+	return resp, nil
+}
+
 // GetNEP17Balances is a wrapper for getnep17balances RPC.
 func (c *Client) GetNEP17Balances(address util.Uint160) (*result.NEP17Balances, error) {
 	params := request.NewRawParams(address.StringLE())

pkg/rpc/server/client_test.go

@@ -322,3 +322,17 @@ func TestInvokeVerify(t *testing.T) {
 		require.False(t, res.Stack[0].Value().(bool))
 	})
 }
+
+func TestClient_GetNativeContracts(t *testing.T) {
+	chain, rpcSrv, httpSrv := initServerWithInMemoryChain(t)
+	defer chain.Close()
+	defer rpcSrv.Shutdown()
+
+	c, err := client.New(context.Background(), httpSrv.URL, client.Options{})
+	require.NoError(t, err)
+	require.NoError(t, c.Init())
+
+	cs, err := c.GetNativeContracts()
+	require.NoError(t, err)
+	require.Equal(t, chain.GetNatives(), cs)
+}