WIP: Logging

log/log.go

@@ -0,0 +1,79 @@
+package log
+
+import (
+	"log"
+	"strings"
+)
+
+type Level int
+
+const (
+	DebugLevel Level = iota
+	InfoLevel
+	WarnLevel
+	ErrorLevel
+)
+
+func (l Level) String() string {
+	switch l {
+	case DebugLevel:
+		return "DEBUG"
+	case InfoLevel:
+		return "INFO"
+	case WarnLevel:
+		return "WARN"
+	case ErrorLevel:
+		return "ERROR"
+	}
+	return "unknown"
+}
+
+var (
+	level = InfoLevel
+)
+
+func Debug(message string, v ...interface{}) {
+	logIf(DebugLevel, message, v...)
+}
+
+func Info(message string, v ...interface{}) {
+	logIf(InfoLevel, message, v...)
+}
+
+func Warn(message string, v ...interface{}) {
+	logIf(WarnLevel, message, v...)
+}
+
+func Error(message string, v ...interface{}) {
+	logIf(ErrorLevel, message, v...)
+}
+
+func Fatal(v ...interface{}) {
+	log.Fatalln(v...)
+}
+
+func SetLevel(newLevel Level) {
+	level = newLevel
+}
+
+func ToLevel(s string) Level {
+	switch strings.ToLower(s) {
+	case "debug":
+		return DebugLevel
+	case "info":
+		return InfoLevel
+	case "warn", "warning":
+		return WarnLevel
+	case "error":
+		return ErrorLevel
+	default:
+		log.Fatalf("unknown log level: %s", s)
+		return 0
+	}
+}
+
+func logIf(l Level, message string, v ...interface{}) {
+	if level <= l {
+		log.Printf(l.String()+" "+message, v...)
+	}
+}