Initial commit

pkg/logger/logger.go

@@ -0,0 +1,98 @@
+// Copyright 2021 Synology Inc.
+
+package logger
+
+import (
+	"os"
+	"runtime"
+	"strings"
+	"strconv"
+	"time"
+
+	"github.com/sirupsen/logrus"
+	nested "github.com/antonfisher/nested-logrus-formatter"
+)
+
+var WebapiDebug = false
+
+const (
+	DefaultLogLevel = logrus.InfoLevel
+	DefaultTimestampFormat = time.RFC3339
+)
+
+type CallerHook struct {
+	FileNameAndLine string
+	Skip            int
+}
+
+func (hook *CallerHook) Fire(entry *logrus.Entry) error {
+	fileName, line := findCaller(hook.Skip)
+	entry.Data[hook.FileNameAndLine] = fileName + ":" + strconv.Itoa(line) // <filename>:<line>
+	return nil
+}
+
+func (hook *CallerHook) Levels() []logrus.Level {
+	return logrus.AllLevels
+}
+
+func NewCallerHook() logrus.Hook {
+	hook := CallerHook{
+		FileNameAndLine: "filePath",
+		Skip: 5,
+	}
+	return &hook
+}
+
+func getCaller(skip int) (string, int) {
+	_, file, line, ok := runtime.Caller(skip)
+	if !ok{
+		return "", 0
+	}
+
+	n := 0
+	for i := len(file) - 1; i > 0; i-- {
+		if string(file[i]) == "/" {
+			n++
+			if n >= 2 {
+				file = file[i+1:]
+				break
+			}
+		}
+	}
+	return file, line
+}
+
+func findCaller(skip int) (string, int)  {
+	var file string
+	var line int
+	for i := 0; i < 10; i++ {
+		file, line = getCaller(skip+i)
+		// if called by logrus functions, continue finding the upper caller
+		if !strings.HasPrefix(file, "logrus"){
+			break
+		}
+	}
+	return file, line
+}
+
+func setLogLevel(logLevel string) {	// debug, info, warn, error, fatal
+	level, err := logrus.ParseLevel(logLevel)
+	if err == nil {
+		logrus.SetLevel(level)
+	} else {
+		logrus.SetLevel(DefaultLogLevel)
+	}
+	return
+}
+
+func Init(logLevel string) {
+	logrus.AddHook(NewCallerHook())
+	logrus.SetOutput(os.Stdout)
+	setLogLevel(logLevel)
+	logrus.SetFormatter(&nested.Formatter{
+		HideKeys: true,
+		TimestampFormat: DefaultTimestampFormat,
+		ShowFullLevel: true,
+		NoColors: true,
+	})
+}