Fixed #77 and added systemwide logger

+ Added system wide logger (wip)
+ Fixed issue #77 uptime monitor bug
+ Added backend options for bypass global TLS (or allow per rule TLS settings, wip)
+

src/mod/info/logger/logger.go

@@ -0,0 +1,103 @@
+package logger
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+	"strconv"
+	"time"
+)
+
+/*
+	Zoraxy Logger
+
+	This script is designed to make a managed log for the Zoraxy
+	and replace the ton of log.Println in the system core
+*/
+
+type Logger struct {
+	LogToFile      bool   //Set enable write to file
+	Prefix         string //Prefix for log files
+	LogFolder      string //Folder to store the log  file
+	CurrentLogFile string //Current writing filename
+	file           *os.File
+}
+
+func NewLogger(logFilePrefix string, logFolder string, logToFile bool) (*Logger, error) {
+	err := os.MkdirAll(logFolder, 0775)
+	if err != nil {
+		return nil, err
+	}
+
+	thisLogger := Logger{
+		LogToFile: logToFile,
+		Prefix:    logFilePrefix,
+		LogFolder: logFolder,
+	}
+
+	logFilePath := thisLogger.getLogFilepath()
+	f, err := os.OpenFile(logFilePath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0755)
+	if err != nil {
+		return nil, err
+	}
+	thisLogger.CurrentLogFile = logFilePath
+	thisLogger.file = f
+	return &thisLogger, nil
+}
+
+func (l *Logger) getLogFilepath() string {
+	year, month, _ := time.Now().Date()
+	return filepath.Join(l.LogFolder, l.Prefix+"_"+strconv.Itoa(year)+"-"+strconv.Itoa(int(month))+".log")
+}
+
+// PrintAndLog will log the message to file and print the log to STDOUT
+func (l *Logger) PrintAndLog(title string, message string, originalError error) {
+	go func() {
+		l.Log(title, message, originalError)
+	}()
+	log.Println("[" + title + "] " + message)
+}
+
+// Println is a fast snap-in replacement for log.Println
+func (l *Logger) Println(v ...interface{}) {
+	//Convert the array of interfaces into string
+	message := fmt.Sprint(v...)
+	go func() {
+		l.Log("info", string(message), nil)
+	}()
+	log.Println("[INFO] " + string(message))
+}
+
+func (l *Logger) Log(title string, errorMessage string, originalError error) {
+	l.ValidateAndUpdateLogFilepath()
+	if l.LogToFile {
+		if originalError == nil {
+			l.file.WriteString(time.Now().Format("2006-01-02 15:04:05.000000") + "|" + fmt.Sprintf("%-16s", title) + " [INFO]" + errorMessage + "\n")
+		} else {
+			l.file.WriteString(time.Now().Format("2006-01-02 15:04:05.000000") + "|" + fmt.Sprintf("%-16s", title) + " [ERROR]" + errorMessage + " " + originalError.Error() + "\n")
+		}
+	}
+
+}
+
+// Validate if the logging target is still valid (detect any months change)
+func (l *Logger) ValidateAndUpdateLogFilepath() {
+	expectedCurrentLogFilepath := l.getLogFilepath()
+	if l.CurrentLogFile != expectedCurrentLogFilepath {
+		//Change of month. Update to a new log file
+		l.file.Close()
+		f, err := os.OpenFile(expectedCurrentLogFilepath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0755)
+		if err != nil {
+			log.Println("[Logger] Unable to create new log. Logging to file disabled.")
+			l.LogToFile = false
+			return
+		}
+		l.CurrentLogFile = expectedCurrentLogFilepath
+		l.file = f
+	}
+}
+
+func (l *Logger) Close() {
+	l.file.Close()
+}

src/mod/info/logviewer/logviewer.go

@@ -0,0 +1,122 @@
+package logviewer
+
+import (
+	"encoding/json"
+	"errors"
+	"io/fs"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"imuslab.com/zoraxy/mod/utils"
+)
+
+type ViewerOption struct {
+	RootFolder string //The root folder to scan for log
+	Extension  string //The extension the root files use, include the . in your ext (e.g. .log)
+}
+
+type Viewer struct {
+	option *ViewerOption
+}
+
+type LogFile struct {
+	Title    string
+	Filename string
+	Fullpath string
+	Filesize int64
+}
+
+func NewLogViewer(option *ViewerOption) *Viewer {
+	return &Viewer{option: option}
+}
+
+/*
+	Log Request Handlers
+*/
+//List all the log files in the log folder. Return in map[string]LogFile format
+func (v *Viewer) HandleListLog(w http.ResponseWriter, r *http.Request) {
+	logFiles := v.ListLogFiles(false)
+	js, _ := json.Marshal(logFiles)
+	utils.SendJSONResponse(w, string(js))
+}
+
+// Read log of a given catergory and filename
+// Require GET varaible: file and catergory
+func (v *Viewer) HandleReadLog(w http.ResponseWriter, r *http.Request) {
+	filename, err := utils.GetPara(r, "file")
+	if err != nil {
+		utils.SendErrorResponse(w, "invalid filename given")
+		return
+	}
+
+	catergory, err := utils.GetPara(r, "catergory")
+	if err != nil {
+		utils.SendErrorResponse(w, "invalid catergory given")
+		return
+	}
+
+	content, err := v.LoadLogFile(strings.TrimSpace(filepath.Base(catergory)), strings.TrimSpace(filepath.Base(filename)))
+	if err != nil {
+		utils.SendErrorResponse(w, err.Error())
+		return
+	}
+
+	utils.SendTextResponse(w, content)
+}
+
+/*
+	Log Access Functions
+*/
+
+func (v *Viewer) ListLogFiles(showFullpath bool) map[string][]*LogFile {
+	result := map[string][]*LogFile{}
+	filepath.WalkDir(v.option.RootFolder, func(path string, di fs.DirEntry, err error) error {
+		if filepath.Ext(path) == v.option.Extension {
+			catergory := filepath.Base(filepath.Dir(path))
+			logList, ok := result[catergory]
+			if !ok {
+				//this catergory hasn't been scanned before.
+				logList = []*LogFile{}
+			}
+
+			fullpath := filepath.ToSlash(path)
+			if !showFullpath {
+				fullpath = ""
+			}
+
+			st, err := os.Stat(path)
+			if err != nil {
+				return nil
+			}
+
+			logList = append(logList, &LogFile{
+				Title:    strings.TrimSuffix(filepath.Base(path), filepath.Ext(path)),
+				Filename: filepath.Base(path),
+				Fullpath: fullpath,
+				Filesize: st.Size(),
+			})
+
+			result[catergory] = logList
+		}
+
+		return nil
+	})
+	return result
+}
+
+func (v *Viewer) LoadLogFile(catergory string, filename string) (string, error) {
+	logFilepath := filepath.Join(v.option.RootFolder, catergory, filename)
+	if utils.FileExists(logFilepath) {
+		//Load it
+		content, err := os.ReadFile(logFilepath)
+		if err != nil {
+			return "", err
+		}
+
+		return string(content), nil
+	} else {
+		return "", errors.New("log file not found")
+	}
+}