[#950] cli: Refactor usage of NeoFS API client

The client needs of the CLI application are limited and change not often.
Interface changes of the client library should not affect the operation of
various application packages, if they do not change their requirements for
the provided functionality. To localize the use of the base client and
facilitate further support, an auxiliary package is implemented that will
only be used by the CLI application.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

cmd/neofs-cli/modules/accounting.go

@@ -1,12 +1,12 @@
 package cmd
 
 import (
-	"context"
 	"fmt"
 	"math"
 
 	"github.com/nspcc-dev/neofs-api-go/pkg/accounting"
 	"github.com/nspcc-dev/neofs-api-go/pkg/owner"
+	internalclient "github.com/nspcc-dev/neofs-node/cmd/neofs-cli/internal/client"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 )
@@ -37,19 +37,11 @@ var accountingBalanceCmd = &cobra.Command{
 	Short: "Get internal balance of NeoFS account",
 	Long:  `Get internal balance of NeoFS account`,
 	Run: func(cmd *cobra.Command, args []string) {
-		var (
-			response *accounting.Decimal
-			oid      *owner.ID
-
-			ctx = context.Background()
-		)
+		var oid *owner.ID
 
 		key, err := getKey()
 		exitOnErr(cmd, err)
 
-		cli, err := getSDKClient(key)
-		exitOnErr(cmd, err)
-
 		if balanceOwner == "" {
 			wallet, err := owner.NEO3WalletFromPublicKey(&key.PublicKey)
 			exitOnErr(cmd, err)
@@ -60,11 +52,16 @@ var accountingBalanceCmd = &cobra.Command{
 			exitOnErr(cmd, err)
 		}
 
-		response, err = cli.GetBalance(ctx, oid, globalCallOptions()...)
+		var prm internalclient.BalanceOfPrm
+
+		prepareAPIClientWithKey(cmd, key, &prm)
+		prm.SetOwner(oid)
+
+		res, err := internalclient.BalanceOf(prm)
 		exitOnErr(cmd, errf("rpc error: %w", err))
 
 		// print to stdout
-		prettyPrintDecimal(cmd, response)
+		prettyPrintDecimal(cmd, res.Balance())
 	},
 }