watchtower/wtwire/summary: adds message summaries

watchtower/wtwire/summary.go

@@ -0,0 +1,35 @@
+package wtwire
+
+import "fmt"
+
+// MessageSummary creates a human-readable description of a given Message. If
+// the type is unknown, an empty string is returned.
+func MessageSummary(msg Message) string {
+	switch msg := msg.(type) {
+	case *Init:
+		return ""
+
+	case *CreateSession:
+		return fmt.Sprintf("blob_type=%s, max_updates=%d "+
+			"reward_rate=%d sweep_fee_rate=%d", msg.BlobType,
+			msg.MaxUpdates, msg.RewardRate, msg.SweepFeeRate)
+
+	case *CreateSessionReply:
+		return fmt.Sprintf("code=%d", msg.Code)
+
+	case *StateUpdate:
+		return fmt.Sprintf("seqnum=%d last_applied=%d is_complete=%d "+
+			"hint=%x", msg.SeqNum, msg.LastApplied, msg.IsComplete,
+			msg.Hint)
+
+	case *StateUpdateReply:
+		return fmt.Sprintf("code=%d last_applied=%d", msg.Code,
+			msg.LastApplied)
+
+	case *Error:
+		return fmt.Sprintf("code=%d", msg.Code)
+
+	default:
+		return ""
+	}
+}