current identity interface (#99)

* current identity interface

Author: vitiko

sdk/invoker.go

@@ -8,6 +8,8 @@ import (
 )
 
 type Invoker interface {
+	CurrentIdentity() msp.SigningIdentity
+
 	Query(
 		ctx context.Context,
 		chanName string,

testing/mocked_peer.go

@@ -60,6 +60,10 @@ func (mp *MockedPeer) WithChannel(channel string, mockStubs ...*MockStub) *Mocke
 	return mp
 }
 
+func (mp *MockedPeer) CurrentIdentity() msp.SigningIdentity {
+	return nil
+}
+
 func (mp *MockedPeer) Invoke(
 	ctx context.Context,
 	channel string,

testing/mocked_peer_decorator.go

@@ -53,6 +53,10 @@ func NewPeerDecorator(sdk sdk.SDK) *MockedPeerDecorator {
 	}
 }
 
+func (mpd *MockedPeerDecorator) CurrentIdentity() msp.SigningIdentity {
+	return mpd.SDK.CurrentIdentity()
+}
+
 func (mpd *MockedPeerDecorator) Invoke(
 	ctx context.Context,
 	channel string,