rpc: move NotaryRequestEvent to the subscriptions pkg

It is used for subscriptions only, so move it to the subscriptions pkg.

pkg/rpc/client/wsclient.go

@@ -40,7 +40,7 @@ type WSClient struct {
 
 // Notification represents server-generated notification for client subscriptions.
 // Value can be one of block.Block, state.AppExecResult, subscriptions.NotificationEvent
-// transaction.Transaction or response.NotaryRequestEvent based on Type.
+// transaction.Transaction or subscriptions.NotaryRequestEvent based on Type.
 type Notification struct {
 	Type  response.EventID
 	Value interface{}
@@ -151,7 +151,7 @@ readloop:
 			case response.ExecutionEventID:
 				val = new(state.AppExecResult)
 			case response.NotaryRequestEventID:
-				val = new(response.NotaryRequestEvent)
+				val = new(subscriptions.NotaryRequestEvent)
 			case response.MissedEventID:
 				// No value.
 			default:

pkg/rpc/response/events.go

@@ -3,21 +3,10 @@ package response
 import (
 	"encoding/json"
 	"errors"
-
-	"github.com/nspcc-dev/neo-go/pkg/core/mempoolevent"
-	"github.com/nspcc-dev/neo-go/pkg/network/payload"
 )
 
-type (
-	// EventID represents an event type happening on the chain.
-	EventID byte
-	// NotaryRequestEvent represents P2PNotaryRequest event either added or removed
-	// from notary payload pool.
-	NotaryRequestEvent struct {
-		Type          mempoolevent.Type         `json:"type"`
-		NotaryRequest *payload.P2PNotaryRequest `json:"notaryrequest"`
-	}
-)
+// EventID represents an event type happening on the chain.
+type EventID byte
 
 const (
 	// InvalidEventID is an invalid event id that is the default value of

pkg/rpc/response/result/subscriptions/notary_request_event.go

@@ -0,0 +1,13 @@
+package subscriptions
+
+import (
+	"github.com/nspcc-dev/neo-go/pkg/core/mempoolevent"
+	"github.com/nspcc-dev/neo-go/pkg/network/payload"
+)
+
+// NotaryRequestEvent represents P2PNotaryRequest event either added or removed
+// from notary payload pool.
+type NotaryRequestEvent struct {
+	Type          mempoolevent.Type         `json:"type"`
+	NotaryRequest *payload.P2PNotaryRequest `json:"notaryrequest"`
+}

pkg/rpc/server/server.go

@@ -1705,7 +1705,7 @@ chloop:
 			resp.Payload[0] = tx
 		case e := <-s.notaryRequestCh:
 			resp.Event = response.NotaryRequestEventID
-			resp.Payload[0] = &response.NotaryRequestEvent{
+			resp.Payload[0] = &subscriptions.NotaryRequestEvent{
 				Type:          e.Type,
 				NotaryRequest: e.Data.(*payload.P2PNotaryRequest),
 			}

pkg/rpc/server/subscription.go

@@ -83,7 +83,7 @@ func (f *feed) Matches(r *response.Notification) bool {
 		return applog.VMState.String() == filt.State
 	case response.NotaryRequestEventID:
 		filt := f.filter.(request.TxFilter)
-		req := r.Payload[0].(*response.NotaryRequestEvent)
+		req := r.Payload[0].(*subscriptions.NotaryRequestEvent)
 		senderOk := filt.Sender == nil || req.NotaryRequest.FallbackTransaction.Signers[1].Account == *filt.Sender
 		signerOK := true
 		if filt.Signer != nil {