[#770] pkg/morph/event: Add notary notifications support

Add handlers and parsers functionality for listener.
Separate notification and notary events by files.

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

pkg/morph/event/parsers.go

@@ -3,6 +3,7 @@ package event
 import (
 	"fmt"
 
+	"github.com/nspcc-dev/neo-go/pkg/network/payload"
 	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 )
 
@@ -19,20 +20,31 @@ type NotificationParserInfo struct {
 	p NotificationParser
 }
 
-type wrongPrmNumber struct {
-	exp, act int
+// NotaryPreparator constructs NotaryEvent
+// from the NotaryRequest event.
+type NotaryPreparator interface {
+	Prepare(*payload.P2PNotaryRequest) (NotaryEvent, error)
 }
 
-// WrongNumberOfParameters returns an error about wrong number of smart contract parameters.
-func WrongNumberOfParameters(exp, act int) error {
-	return &wrongPrmNumber{
-		exp: exp,
-		act: act,
-	}
+// NotaryParser is a function that constructs Event
+// from the NotaryEvent event.
+type NotaryParser func(NotaryEvent) (Event, error)
+
+// NotaryParserInfo is a structure that groups
+// the parameters of particular notary request
+// event parser.
+type NotaryParserInfo struct {
+	notaryRequestTypes
+
+	p NotaryParser
 }
 
-func (s wrongPrmNumber) Error() string {
-	return fmt.Errorf("wrong parameter count: expected %d, has %d", s.exp, s.act).Error()
+func (n *NotaryParserInfo) parser() NotaryParser {
+	return n.p
+}
+
+func (n *NotaryParserInfo) SetParser(p NotaryParser) {
+	n.p = p
 }
 
 // SetParser is an event parser setter.
@@ -52,3 +64,19 @@ func (s *NotificationParserInfo) SetType(v Type) {
 func (s NotificationParserInfo) getType() Type {
 	return s.typ
 }
+
+type wrongPrmNumber struct {
+	exp, act int
+}
+
+// WrongNumberOfParameters returns an error about wrong number of smart contract parameters.
+func WrongNumberOfParameters(exp, act int) error {
+	return &wrongPrmNumber{
+		exp: exp,
+		act: act,
+	}
+}
+
+func (s wrongPrmNumber) Error() string {
+	return fmt.Errorf("wrong parameter count: expected %d, has %d", s.exp, s.act).Error()
+}