rpc: allow to use address, id or name instead of scripthash [Client]

... for getcontractstate RPC client method.

cli/options_test.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"flag"
+	"testing"
+
+	"github.com/nspcc-dev/neo-go/cli/options"
+	"github.com/stretchr/testify/require"
+	"github.com/urfave/cli"
+)
+
+func TestGetRPCClient(t *testing.T) {
+	e := newExecutor(t, true)
+	defer e.Close(t)
+
+	t.Run("no endpoint", func(t *testing.T) {
+		set := flag.NewFlagSet("flagSet", flag.ExitOnError)
+		ctx := cli.NewContext(cli.NewApp(), set, nil)
+		gctx, _ := options.GetTimeoutContext(ctx)
+		_, ec := options.GetRPCClient(gctx, ctx)
+		require.Equal(t, 1, ec.ExitCode())
+	})
+
+	t.Run("success", func(t *testing.T) {
+		set := flag.NewFlagSet("flagSet", flag.ExitOnError)
+		set.String(options.RPCEndpointFlag, "http://"+e.RPC.Addr, "")
+		ctx := cli.NewContext(cli.NewApp(), set, nil)
+		gctx, _ := options.GetTimeoutContext(ctx)
+		_, ec := options.GetRPCClient(gctx, ctx)
+		require.Nil(t, ec)
+	})
+}