/
fileLogger.go
177 lines (148 loc) · 3.8 KB
/
fileLogger.go
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package logging
import (
"archive/zip"
"fmt"
"io"
"log"
"os"
"path/filepath"
"time"
)
type FileLogger struct {
file *os.File
maxFileSize int64
logDirectory string
logFilePrefix string
// The logChan is used to send log messages to the logger goroutine.
logChan chan logEntry
// The quitChan is used to send a signal to the logger goroutine to stop.
quitChan chan bool
}
type logEntry struct {
level string
msg string
args []interface{}
}
func NewFileLogger(logDirectory, logFilePrefix string, maxFileSize int64) (*FileLogger, error) {
if err := os.MkdirAll(logDirectory, 0755); err != nil {
return nil, err
}
logFile, err := createLogFile(logDirectory)
if err != nil {
return nil, err
}
fileLogger := FileLogger{
file: logFile,
maxFileSize: maxFileSize,
logDirectory: logDirectory,
logFilePrefix: logFilePrefix,
logChan: make(chan logEntry, 100),
quitChan: make(chan bool),
}
go fileLogger.logHandler()
return &fileLogger, nil
}
// implement ILogger interface
func (fl *FileLogger) Debug(msg string, args ...interface{}) {
fl.log("DEBUG", msg, args...)
}
func (fl *FileLogger) Info(msg string, args ...interface{}) {
fl.log("INFO", msg, args...)
}
func (fl *FileLogger) Warn(msg string, args ...interface{}) {
fl.log("WARN", msg, args...)
}
func (fl *FileLogger) Error(msg string, args ...interface{}) {
fl.log("ERROR", msg, args...)
}
// createLogFile creates a new log file in the given directory with the given prefix.
func createLogFile(logDirectory string) (*os.File, error) {
logFilePrefix := "chux-datastore-log"
timestamp := time.Now().Format("2006-01-02")
fileName := fmt.Sprintf("%s-%s.log", logFilePrefix, timestamp)
filePath := filepath.Join(logDirectory, fileName)
return os.OpenFile(filePath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
}
func (fl *FileLogger) log(level, msg string, args ...interface{}) {
fl.logChan <- logEntry{level: level, msg: msg, args: args}
}
func (fl *FileLogger) needsRotation() bool {
fileInfo, err := fl.file.Stat()
if err != nil {
return false
}
return fileInfo.Size() >= fl.maxFileSize
}
func (fl *FileLogger) rotate() {
// Close the current log file
fl.file.Close()
// Zip the old log file
oldFilePath := fl.file.Name()
zipFilePath := oldFilePath + ".zip"
if err := zipFile(oldFilePath, zipFilePath); err != nil {
fmt.Printf("Error zipping old log file: %v\n", err)
} else {
os.Remove(oldFilePath)
}
// Create a new log file
newLogFile, err := createLogFile(fl.logDirectory)
if err != nil {
fmt.Printf("Error creating new log file: %v\n", err)
return
}
fl.file = newLogFile
}
func (fl *FileLogger) logHandler() {
for {
select {
case entry := <-fl.logChan:
// Check if the file size exceeds the maximum size
if fl.needsRotation() {
fl.rotate()
}
log.SetOutput(fl.file)
log.Printf("%s: %s", entry.level, fmt.Sprintf(entry.msg, entry.args...))
case <-fl.quitChan:
return
}
}
}
func (fl *FileLogger) Close() {
fl.quitChan <- true
close(fl.logChan)
fl.file.Close()
}
// zipFile zips a log file and returns an error if any
// occurs during the process.
func zipFile(source, target string) error {
zipFile, err := os.Create(target)
if err != nil {
return err
}
defer zipFile.Close()
archive := zip.NewWriter(zipFile)
defer archive.Close()
sourceFile, err := os.Open(source)
if err != nil {
return err
}
defer sourceFile.Close()
fileInfo, err := sourceFile.Stat()
if err != nil {
return err
}
header, err := zip.FileInfoHeader(fileInfo)
if err != nil {
return err
}
// Use the file name as the zip entry name
header.Name = filepath.Base(source)
// Set the compression method to Deflate
header.Method = zip.Deflate
writer, err := archive.CreateHeader(header)
if err != nil {
return err
}
_, err = io.Copy(writer, sourceFile)
return err
}