Merge pull request #504 from rakshasa/fix/mock-conn-race-2

fix: changing entry conversations in mock connection manager caused r…

internal/test/ouroboros_mock/connection.go

@@ -187,9 +187,12 @@ func (c *Connection) processInputEntry(entry ConversationEntry) error {
 		if msg == nil {
 			return fmt.Errorf("received unknown message type: %d", msgType)
 		}
-		// Set CBOR for expected message to match received to make comparison easier
-		entry.InputMessage.SetCbor(msg.Cbor())
-		// Compare received message to expected message
+
+		// Compare received message to expected message, excluding the cbor content
+		//
+		// As changing the CBOR of the expected message is not thread-safe, we instead clear the
+		// CBOR of the received message
+		msg.SetCbor(nil)
 		if !reflect.DeepEqual(msg, entry.InputMessage) {
 			return fmt.Errorf(
 				"parsed message does not match expected value: got %#v, expected %#v",

protocol/message.go

@@ -31,6 +31,10 @@ type MessageBase struct {
 
 // SetCbor stores the original CBOR that was parsed
 func (m *MessageBase) SetCbor(data []byte) {
+	if data == nil {
+		m.rawCbor = nil
+		return
+	}
 	m.rawCbor = make([]byte, len(data))
 	copy(m.rawCbor, data)
 }