add logger component

config/parsing/logger/parse.go

@@ -0,0 +1,55 @@
+package logger
+
+import (
+	"io"
+	"os"
+	"path/filepath"
+
+	"github.com/go-gost/core/logger"
+	"github.com/go-gost/x/config"
+	xlogger "github.com/go-gost/x/logger"
+	"gopkg.in/natefinch/lumberjack.v2"
+)
+
+func ParseLogger(cfg *config.LoggerConfig) logger.Logger {
+	if cfg == nil || cfg.Log == nil {
+		return nil
+	}
+	opts := []xlogger.Option{
+		xlogger.NameOption(cfg.Name),
+		xlogger.FormatOption(logger.LogFormat(cfg.Log.Format)),
+		xlogger.LevelOption(logger.LogLevel(cfg.Log.Level)),
+	}
+
+	var out io.Writer = os.Stderr
+	switch cfg.Log.Output {
+	case "none", "null":
+		return xlogger.Nop()
+	case "stdout":
+		out = os.Stdout
+	case "stderr", "":
+		out = os.Stderr
+	default:
+		if cfg.Log.Rotation != nil {
+			out = &lumberjack.Logger{
+				Filename:   cfg.Log.Output,
+				MaxSize:    cfg.Log.Rotation.MaxSize,
+				MaxAge:     cfg.Log.Rotation.MaxAge,
+				MaxBackups: cfg.Log.Rotation.MaxBackups,
+				LocalTime:  cfg.Log.Rotation.LocalTime,
+				Compress:   cfg.Log.Rotation.Compress,
+			}
+		} else {
+			os.MkdirAll(filepath.Dir(cfg.Log.Output), 0755)
+			f, err := os.OpenFile(cfg.Log.Output, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
+			if err != nil {
+				logger.Default().Warn(err)
+			} else {
+				out = f
+			}
+		}
+	}
+	opts = append(opts, xlogger.OutputOption(out))
+
+	return xlogger.NewLogger(opts...)
+}