[#42] common: Replace IRNode type and InnerRingInvoker func to ir.go file

Remove empty invoke.go source file.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

common/invoke.go

@@ -1,21 +0,0 @@
-package common
-
-import (
-	"github.com/nspcc-dev/neo-go/pkg/interop/runtime"
-)
-
-type IRNode struct {
-	PublicKey []byte
-}
-
-// InnerRingInvoker returns public key of inner ring node that invoked contract.
-func InnerRingInvoker(ir []IRNode) []byte {
-	for i := 0; i < len(ir); i++ {
-		node := ir[i]
-		if runtime.CheckWitness(node.PublicKey) {
-			return node.PublicKey
-		}
-	}
-
-	return nil
-}

common/ir.go

@@ -3,11 +3,28 @@ package common
 import (
 	"github.com/nspcc-dev/neo-go/pkg/interop"
 	"github.com/nspcc-dev/neo-go/pkg/interop/contract"
+	"github.com/nspcc-dev/neo-go/pkg/interop/runtime"
 	"github.com/nspcc-dev/neo-go/pkg/interop/storage"
 )
 
 const irListMethod = "innerRingList"
 
+type IRNode struct {
+	PublicKey []byte
+}
+
+// InnerRingInvoker returns public key of inner ring node that invoked contract.
+func InnerRingInvoker(ir []IRNode) []byte {
+	for i := 0; i < len(ir); i++ {
+		node := ir[i]
+		if runtime.CheckWitness(node.PublicKey) {
+			return node.PublicKey
+		}
+	}
+
+	return nil
+}
+
 // InnerRingList returns list of inner ring nodes through calling
 // "innerRingList" method of smart contract.
 //