Initial release

src/log.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+	"fmt"
+	"log"
+)
+
+// LogLevel is the minimum level of log messages to print
+type LogLevel int
+
+// Auto set log level
+const (
+	DEBUG LogLevel = iota
+	INFO
+	WARNING
+	ERROR
+	FATAL
+)
+
+var level = INFO
+
+// SetLogLevel sets minimum log level to print
+func SetLogLevel(logLevel string) error {
+	switch logLevel {
+	case "FATAL":
+		level = FATAL
+	case "ERROR":
+		level = ERROR
+	case "WARNING":
+		level = WARNING
+	case "INFO":
+		level = INFO
+	case "DEBUG":
+		level = DEBUG
+	default:
+		return fmt.Errorf("log level %s not allowed", logLevel)
+	}
+	return nil
+}
+
+// Debug prints very verbose messages
+func Debug(message string, args ...interface{}) {
+	if level <= DEBUG {
+		log.Printf("DEBUG: "+message, args...)
+	}
+}
+
+// Info prints informative messages
+func Info(message string, args ...interface{}) {
+	if level <= INFO {
+		log.Printf("INFO: "+message, args...)
+	}
+}
+
+// Warning prints messages you should give attention
+func Warning(message string, args ...interface{}) {
+	if level <= WARNING {
+		log.Printf("WARNING: "+message, args...)
+	}
+}
+
+// Error prints impacting messages
+func Error(message string, args ...interface{}) {
+	if level <= ERROR {
+		log.Printf("ERROR: "+message, args...)
+	}
+}
+
+// Fatal prints a message and exit program
+func Fatal(message string, args ...interface{}) {
+	if level <= FATAL {
+		log.Fatalf("FATAL: "+message, args...)
+	}
+}