Add String() to LogType enum for easier debugging. (hashicorp#442)

log.go

@@ -1,6 +1,7 @@
 package raft
 
 import (
+	"fmt"
 	"time"
 
 	metrics "github.com/armon/go-metrics"
@@ -39,6 +40,26 @@ const (
 	LogConfiguration
 )
 
+// String returns LogType as a human readable string.
+func (lt LogType) String() string {
+	switch lt {
+	case LogCommand:
+		return "LogCommand"
+	case LogNoop:
+		return "LogNoop"
+	case LogAddPeerDeprecated:
+		return "LogAddPeerDeprecated"
+	case LogRemovePeerDeprecated:
+		return "LogRemovePeerDeprecated"
+	case LogBarrier:
+		return "LogBarrier"
+	case LogConfiguration:
+		return "LogConfiguration"
+	default:
+		return fmt.Sprintf("%d", lt)
+	}
+}
+
 // Log entries are replicated to all members of the Raft cluster
 // and form the heart of the replicated state machine.
 type Log struct {