[#1514] adm/nns: Do not create actor for readonly commands

`nns get-records` and `nns tokens` command do not need to sign anything,
so remove useless actor and use invoker directly.
`NewLocalActor()` is only used in `ape` and `nns` packages. `ape`
package seem to use it correctly, only when alphabet wallets are
provided, so no changes there.
Also, remove --alphabet-wallets flag from commands that do not need it.

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

cmd/frostfs-adm/internal/modules/morph/helper/actor.go

@@ -38,20 +38,7 @@ func NewLocalActor(cmd *cobra.Command, c actor.RPCActor, accName string) (*Local
 	walletDir := config.ResolveHomePath(viper.GetString(commonflags.AlphabetWalletsFlag))
 	var act *actor.Actor
 	var accounts []*wallet.Account
-	if walletDir == "" {
-		account, err := wallet.NewAccount()
-		commonCmd.ExitOnErr(cmd, "unable to create dummy account: %w", err)
-		act, err = actor.New(c, []actor.SignerAccount{{
-			Signer: transaction.Signer{
-				Account: account.Contract.ScriptHash(),
-				Scopes:  transaction.Global,
-			},
-			Account: account,
-		}})
-		if err != nil {
-			return nil, err
-		}
-	} else {
+
 	wallets, err := GetAlphabetWallets(viper.GetViper(), walletDir)
 	commonCmd.ExitOnErr(cmd, "unable to get alphabet wallets: %w", err)
 
@@ -70,7 +57,6 @@ func NewLocalActor(cmd *cobra.Command, c actor.RPCActor, accName string) (*Local
 	if err != nil {
 		return nil, err
 	}
-	}
 	return &LocalActor{
 		neoActor:   act,
 		accounts:   accounts,

cmd/frostfs-adm/internal/modules/morph/nns/helper.go

@@ -5,6 +5,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-adm/internal/modules/morph/constants"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-adm/internal/modules/morph/helper"
 	commonCmd "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/internal/common"
+	"github.com/nspcc-dev/neo-go/pkg/rpcclient/invoker"
 	"github.com/nspcc-dev/neo-go/pkg/rpcclient/management"
 	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/spf13/cobra"
@@ -24,3 +25,15 @@ func getRPCClient(cmd *cobra.Command) (*client.Contract, *helper.LocalActor, uti
 	commonCmd.ExitOnErr(cmd, "can't get NNS contract state: %w", err)
 	return client.New(ac, nnsCs.Hash), ac, nnsCs.Hash
 }
+
+func nnsReader(cmd *cobra.Command) (*client.ContractReader, *invoker.Invoker) {
+	c, err := helper.GetN3Client(viper.GetViper())
+	commonCmd.ExitOnErr(cmd, "unable to create NEO rpc client: %w", err)
+
+	inv := invoker.New(c, nil)
+	r := management.NewReader(inv)
+	nnsCs, err := helper.GetContractByID(r, 1)
+	commonCmd.ExitOnErr(cmd, "can't get NNS contract state: %w", err)
+
+	return client.NewReader(inv, nnsCs.Hash), inv
+}

cmd/frostfs-adm/internal/modules/morph/nns/record.go

@@ -28,7 +28,6 @@ func initAddRecordCmd() {
 func initGetRecordsCmd() {
 	Cmd.AddCommand(getRecordsCmd)
 	getRecordsCmd.Flags().StringP(commonflags.EndpointFlag, commonflags.EndpointFlagShort, "", commonflags.EndpointFlagDesc)
-	getRecordsCmd.Flags().String(commonflags.AlphabetWalletsFlag, "", commonflags.AlphabetWalletsFlagDesc)
 	getRecordsCmd.Flags().String(nnsNameFlag, "", nnsNameFlagDesc)
 	getRecordsCmd.Flags().String(nnsRecordTypeFlag, "", nnsRecordTypeFlagDesc)
 
@@ -76,16 +75,16 @@ func addRecord(cmd *cobra.Command, _ []string) {
 }
 
 func getRecords(cmd *cobra.Command, _ []string) {
-	c, act, _ := getRPCClient(cmd)
+	c, inv := nnsReader(cmd)
 	name, _ := cmd.Flags().GetString(nnsNameFlag)
 	recordType, _ := cmd.Flags().GetString(nnsRecordTypeFlag)
 	if recordType == "" {
 		sid, r, err := c.GetAllRecords(name)
 		commonCmd.ExitOnErr(cmd, "unable to get records: %w", err)
 		defer func() {
-			_ = act.Invoker.TerminateSession(sid)
+			_ = inv.TerminateSession(sid)
 		}()
-		items, err := act.Invoker.TraverseIterator(sid, &r, 0)
+		items, err := inv.TraverseIterator(sid, &r, 0)
 		commonCmd.ExitOnErr(cmd, "unable to get records: %w", err)
 		for len(items) != 0 {
 			for j := range items {
@@ -96,7 +95,7 @@ func getRecords(cmd *cobra.Command, _ []string) {
 					recordTypeToString(nns.RecordType(rs[1].Value().(*big.Int).Int64())),
 					string(bs))
 			}
-			items, err = act.Invoker.TraverseIterator(sid, &r, 0)
+			items, err = inv.TraverseIterator(sid, &r, 0)
 			commonCmd.ExitOnErr(cmd, "unable to get records: %w", err)
 		}
 	} else {

cmd/frostfs-adm/internal/modules/morph/nns/tokens.go

@@ -18,12 +18,11 @@ const (
 func initTokensCmd() {
 	Cmd.AddCommand(tokensCmd)
 	tokensCmd.Flags().StringP(commonflags.EndpointFlag, commonflags.EndpointFlagShort, "", commonflags.EndpointFlagDesc)
-	tokensCmd.Flags().String(commonflags.AlphabetWalletsFlag, "", commonflags.AlphabetWalletsFlagDesc)
 	tokensCmd.Flags().BoolP(commonflags.Verbose, commonflags.VerboseShorthand, false, verboseDesc)
 }
 
 func listTokens(cmd *cobra.Command, _ []string) {
-	c, _, _ := getRPCClient(cmd)
+	c, _ := nnsReader(cmd)
 	it, err := c.Tokens()
 	commonCmd.ExitOnErr(cmd, "unable to get tokens: %w", err)
 	for toks, err := it.Next(10); err == nil && len(toks) > 0; toks, err = it.Next(10) {
@@ -41,7 +40,7 @@ func listTokens(cmd *cobra.Command, _ []string) {
 	}
 }
 
-func getCnameRecord(c *client.Contract, token []byte) (string, error) {
+func getCnameRecord(c *client.ContractReader, token []byte) (string, error) {
 	items, err := c.GetRecords(string(token), big.NewInt(int64(nns.CNAME)))
 
 	// GetRecords returns the error "not an array" if the domain does not contain records.