[#1545] morph/event: Simplify frostfs contract event parsing

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

pkg/morph/event/frostfs/config.go

@@ -3,7 +3,7 @@ package frostfs
 import (
 	"fmt"
 
-	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/morph/client"
+	"git.frostfs.info/TrueCloudLab/frostfs-contract/rpcclient/frostfs"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/morph/event"
 	"github.com/nspcc-dev/neo-go/pkg/core/state"
 	"github.com/nspcc-dev/neo-go/pkg/util"
@@ -36,39 +36,15 @@ func (u Config) Key() []byte { return u.KeyValue }
 func (u Config) Value() []byte { return u.ValueValue }
 
 func ParseConfig(e *state.ContainedNotificationEvent) (event.Event, error) {
-	var (
-		ev  Config
-		err error
-	)
-
-	params, err := event.ParseStackArray(e)
-	if err != nil {
-		return nil, fmt.Errorf("could not parse stack items from notify event: %w", err)
+	var sce frostfs.SetConfigEvent
+	if err := sce.FromStackItem(e.Item); err != nil {
+		return nil, fmt.Errorf("parse frostfs.SetConfigEvent: %w", err)
 	}
 
-	if ln := len(params); ln != 3 {
-		return nil, event.WrongNumberOfParameters(3, ln)
-	}
-
-	// parse id
-	ev.IDValue, err = client.BytesFromStackItem(params[0])
-	if err != nil {
-		return nil, fmt.Errorf("could not get config update id: %w", err)
-	}
-
-	// parse key
-	ev.KeyValue, err = client.BytesFromStackItem(params[1])
-	if err != nil {
-		return nil, fmt.Errorf("could not get config key: %w", err)
-	}
-
-	// parse value
-	ev.ValueValue, err = client.BytesFromStackItem(params[2])
-	if err != nil {
-		return nil, fmt.Errorf("could not get config value: %w", err)
-	}
-
-	ev.TxHashValue = e.Container
-
-	return ev, nil
+	return Config{
+		KeyValue:    sce.Key,
+		ValueValue:  sce.Value,
+		IDValue:     sce.Id,
+		TxHashValue: e.Container,
+	}, nil
 }