initial commit

logger/logger.go

@@ -0,0 +1,57 @@
+package logger
+
+import "sync"
+
+const (
+	logFieldScope = "scope"
+)
+
+// LogLevel is Logger Level type
+type LogLevel string
+
+const (
+	// DebugLevel has verbose message
+	DebugLevel LogLevel = "debug"
+	// InfoLevel is default log level
+	InfoLevel LogLevel = "info"
+	// WarnLevel is for logging messages about possible issues
+	WarnLevel LogLevel = "warn"
+	// ErrorLevel is for logging errors
+	ErrorLevel LogLevel = "error"
+	// FatalLevel is for logging fatal messages. The system shuts down after logging the message.
+	FatalLevel LogLevel = "fatal"
+)
+
+var (
+	globalLoggers     = make(map[string]Logger)
+	globalLoggersLock sync.RWMutex
+)
+
+type Logger interface {
+	EnableJSONOutput(enabled bool)
+	SetLevel(level LogLevel)
+	WithFields(map[string]interface{}) Logger
+	Debug(args ...interface{})
+	Debugf(format string, args ...interface{})
+	Info(args ...interface{})
+	Infof(format string, args ...interface{})
+	Warn(args ...interface{})
+	Warnf(format string, args ...interface{})
+	Error(args ...interface{})
+	Errorf(format string, args ...interface{})
+	Fatal(args ...interface{})
+	Fatalf(format string, args ...interface{})
+}
+
+func NewLogger(name string) Logger {
+	globalLoggersLock.Lock()
+	defer globalLoggersLock.Unlock()
+
+	logger, ok := globalLoggers[name]
+	if !ok {
+		logger = newLogger(name)
+		globalLoggers[name] = logger
+	}
+
+	return logger
+}