core: emit notification events in a separate method

pkg/core/interop/context.go

@@ -380,3 +380,12 @@ func (ic *Context) IsHardforkEnabled(hf config.Hardfork) bool {
 	}
 	return len(ic.Hardforks) == 0 // Enable each hard-fork by default.
 }
+
+// AddNotification creates notification event and appends it to the notification list.
+func (ic *Context) AddNotification(hash util.Uint160, name string, item *stackitem.Array) {
+	ic.Notifications = append(ic.Notifications, state.NotificationEvent{
+		ScriptHash: hash,
+		Name:       name,
+		Item:       item,
+	})
+}

pkg/core/interop/runtime/engine.go

@@ -6,7 +6,6 @@ import (
 	"math/big"
 
 	"github.com/nspcc-dev/neo-go/pkg/core/interop"
-	"github.com/nspcc-dev/neo-go/pkg/core/state"
 	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 	"go.uber.org/zap"
 )
@@ -69,12 +68,7 @@ func Notify(ic *interop.Context) error {
 	if len(bytes) > MaxNotificationSize {
 		return fmt.Errorf("notification size shouldn't exceed %d", MaxNotificationSize)
 	}
-	ne := state.NotificationEvent{
-		ScriptHash: ic.VM.GetCurrentScriptHash(),
-		Name:       name,
-		Item:       stackitem.DeepCopy(stackitem.NewArray(args)).(*stackitem.Array),
-	}
-	ic.Notifications = append(ic.Notifications, ne)
+	ic.AddNotification(ic.VM.GetCurrentScriptHash(), name, stackitem.DeepCopy(stackitem.NewArray(args)).(*stackitem.Array))
 	return nil
 }
 

pkg/core/native/designate.go

@@ -15,7 +15,6 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/core/interop/runtime"
 	"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
 	"github.com/nspcc-dev/neo-go/pkg/core/native/noderoles"
-	"github.com/nspcc-dev/neo-go/pkg/core/state"
 	"github.com/nspcc-dev/neo-go/pkg/core/stateroot"
 	"github.com/nspcc-dev/neo-go/pkg/core/storage"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
@@ -386,14 +385,10 @@ func (s *Designate) DesignateAsRole(ic *interop.Context, r noderoles.Role, pubs
 		return fmt.Errorf("failed to update Designation role data cache: %w", err)
 	}
 
-	ic.Notifications = append(ic.Notifications, state.NotificationEvent{
-		ScriptHash: s.Hash,
-		Name:       DesignationEventName,
-		Item: stackitem.NewArray([]stackitem.Item{
+	ic.AddNotification(s.Hash, DesignationEventName, stackitem.NewArray([]stackitem.Item{
 		stackitem.NewBigInteger(big.NewInt(int64(r))),
 		stackitem.NewBigInteger(big.NewInt(int64(ic.Block.Index))),
-		}),
-	})
+	}))
 	return nil
 }
 

pkg/core/native/management.go

@@ -607,12 +607,7 @@ func (m *Management) getNextContractID(d *dao.Simple) (int32, error) {
 }
 
 func (m *Management) emitNotification(ic *interop.Context, name string, hash util.Uint160) {
-	ne := state.NotificationEvent{
-		ScriptHash: m.Hash,
-		Name:       name,
-		Item:       stackitem.NewArray([]stackitem.Item{addrToStackItem(&hash)}),
-	}
-	ic.Notifications = append(ic.Notifications, ne)
+	ic.AddNotification(m.Hash, name, stackitem.NewArray([]stackitem.Item{addrToStackItem(&hash)}))
 }
 
 func checkScriptAndMethods(script []byte, methods []manifest.Method) error {

pkg/core/native/native_nep17.go

@@ -165,16 +165,11 @@ func (c *nep17TokenNative) postTransfer(ic *interop.Context, from, to *util.Uint
 }
 
 func (c *nep17TokenNative) emitTransfer(ic *interop.Context, from, to *util.Uint160, amount *big.Int) {
-	ne := state.NotificationEvent{
-		ScriptHash: c.Hash,
-		Name:       "Transfer",
-		Item: stackitem.NewArray([]stackitem.Item{
+	ic.AddNotification(c.Hash, "Transfer", stackitem.NewArray([]stackitem.Item{
 		addrToStackItem(from),
 		addrToStackItem(to),
 		stackitem.NewBigInteger(amount),
-		}),
-	}
-	ic.Notifications = append(ic.Notifications, ne)
+	}))
 }
 
 // updateAccBalance adds the specified amount to the acc's balance. If requiredBalance

pkg/core/native/oracle.go

@@ -272,15 +272,11 @@ func (o *Oracle) FinishInternal(ic *interop.Context) error {
 	if err != nil {
 		return ErrRequestNotFound
 	}
-
-	ic.Notifications = append(ic.Notifications, state.NotificationEvent{
-		ScriptHash: o.Hash,
-		Name:       "OracleResponse",
-		Item: stackitem.NewArray([]stackitem.Item{
+	ic.AddNotification(o.Hash, "OracleResponse", stackitem.NewArray([]stackitem.Item{
 		stackitem.Make(resp.ID),
 		stackitem.Make(req.OriginalTxID.BytesBE()),
-		}),
-	})
+	}))
+
 	origTx, _, err := ic.DAO.GetTransaction(req.OriginalTxID)
 	if err != nil {
 		return ErrRequestNotFound
@@ -382,16 +378,12 @@ func (o *Oracle) RequestInternal(ic *interop.Context, url string, filter *string
 	} else {
 		filterNotif = stackitem.Null{}
 	}
-	ic.Notifications = append(ic.Notifications, state.NotificationEvent{
-		ScriptHash: o.Hash,
-		Name:       "OracleRequest",
-		Item: stackitem.NewArray([]stackitem.Item{
+	ic.AddNotification(o.Hash, "OracleRequest", stackitem.NewArray([]stackitem.Item{
 		stackitem.Make(id),
 		stackitem.Make(ic.VM.GetCallingScriptHash().BytesBE()),
 		stackitem.Make(url),
 		filterNotif,
-		}),
-	})
+	}))
 	req := &state.OracleRequest{
 		OriginalTxID:     o.getOriginalTxID(ic.DAO, ic.Tx),
 		GasForResponse:   gas.Uint64(),