Logging better?

Former-commit-id: 5fedc2bef1

logger/level.go

@@ -0,0 +1,27 @@
+package logger
+
+type LogLevel int
+
+const (
+	DEBUG LogLevel = iota
+	INFO
+	WARN
+	ERROR
+	FATAL
+)
+
+var levelStrings = map[LogLevel]string{
+	DEBUG: "DEBUG",
+	INFO:  "INFO",
+	WARN:  "WARN",
+	ERROR: "ERROR",
+	FATAL: "FATAL",
+}
+
+// String returns the string representation of the log level
+func (l LogLevel) String() string {
+	if s, ok := levelStrings[l]; ok {
+		return s
+	}
+	return "UNKNOWN"
+}