started working on the backend

backend/pkg/logger/logger.go

@@ -0,0 +1,70 @@
+package logger
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/johannesbuehl/golunteer/backend/pkg/config"
+	"github.com/rs/zerolog"
+	"gopkg.in/natefinch/lumberjack.v2"
+)
+
+var Logger zerolog.Logger
+
+type specificLevelWriter struct {
+	io.Writer
+	Level zerolog.Level
+}
+
+func (w specificLevelWriter) WriteLevel(l zerolog.Level, p []byte) (int, error) {
+	if l >= w.Level {
+		return w.Write(p)
+	} else {
+		return len(p), nil
+	}
+}
+
+func init() {
+	// try to set the log-level
+	zerolog.SetGlobalLevel(config.Config.LogLevel)
+	zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
+
+	// create the console output
+	outputConsole := zerolog.ConsoleWriter{
+		Out:        os.Stdout,
+		TimeFormat: time.DateTime,
+		FormatLevel: func(i interface{}) string {
+			return strings.ToUpper(fmt.Sprintf("| %-6s|", i))
+		},
+		FormatFieldName: func(i interface{}) string {
+			return fmt.Sprintf("%s", i)
+		},
+		NoColor: true,
+	}
+
+	// create the logfile output
+	outputLog := &lumberjack.Logger{
+		Filename:  "logs/backend.log",
+		MaxAge:    7,
+		LocalTime: true,
+	}
+
+	// create a multi-output-writer
+	multi := zerolog.MultiLevelWriter(
+		specificLevelWriter{
+			Writer: outputConsole,
+			Level:  config.Config.LogLevel,
+		},
+		specificLevelWriter{
+			Writer: outputLog,
+			Level:  config.Config.LogLevel,
+		},
+	)
+
+	// create a logger-instance
+	Logger = zerolog.New(multi).With().Timestamp().Logger()
+
+}