From fed95e0069e1da3e841f70a2f3c4b162f4339f13 Mon Sep 17 00:00:00 2001
From: Roman Khimov <roman@nspcc.ru>
Date: Wed, 3 Jun 2020 18:56:20 +0300
Subject: [PATCH] smartcontract: (un)marshal AnyType value as null

Neo 3 can emit Null in its transfer notifications in `from` or `to` fields
when minting/burning tokens (unlike Neo 2 that emitted util.Uint256{} for this
case), then it gets converted to Parameter as AnyType and we have to JSONize
it somehow for proper RPC functioning.
---
 pkg/smartcontract/parameter.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pkg/smartcontract/parameter.go b/pkg/smartcontract/parameter.go
index 5dad09926..54eb394a5 100644
--- a/pkg/smartcontract/parameter.go
+++ b/pkg/smartcontract/parameter.go
@@ -85,7 +85,7 @@ func (p *Parameter) MarshalJSON() ([]byte, error) {
 	case MapType:
 		ppair := p.Value.([]ParameterPair)
 		resultRawValue, resultErr = json.Marshal(ppair)
-	case InteropInterfaceType:
+	case InteropInterfaceType, AnyType:
 		resultRawValue = []byte("null")
 	default:
 		resultErr = errors.Errorf("Marshaller for type %s not implemented", p.Type)
@@ -168,7 +168,7 @@ func (p *Parameter) UnmarshalJSON(data []byte) (err error) {
 			return
 		}
 		p.Value = h
-	case InteropInterfaceType:
+	case InteropInterfaceType, AnyType:
 		// stub, ignore value, it can only be null
 		p.Value = nil
 	default: