main.go
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package gologger
import (
"bytes"
"encoding/json"
"fmt"
"os"
"path/filepath"
"strings"
"sync"
"time"
)
const dateTimeFormat = "2006-01-02 15:04:05"
// Block ...
const (
MaxLogSize5MB int64 = 5 * 1024 * 1024
MaxLogSize1MB int64 = 1 * 1024 * 1024
MaxLogSize500KB int64 = 500 * 1024
MaxLogSize100KB int64 = 100 * 1024
MaxLogSize512B int64 = 512
)
// Logger ...
type Logger struct {
mu *sync.Mutex
outputFile *os.File
outputFileName string
fullName string
maxFileSize int64
splitCount int
directory string
}
// New ...
func New(name, dir string, maxFileSize int64) (logger *Logger, err error) {
logger = &Logger{}
logger.outputFileName = name
logger.mu = &sync.Mutex{}
logger.maxFileSize = maxFileSize
logger.directory = dir
err = os.Mkdir(dir, os.ModePerm)
if err != nil {
if !os.IsExist(err) {
return nil, err
}
}
date := strings.Replace(time.Now().Format(dateTimeFormat), ":", ".", -1)
logger.outputFileName += " " + date
logger.fullName = logger.outputFileName + ".txt"
path := filepath.Join(dir, logger.fullName)
if logger.outputFile, err = os.Create(path); err != nil {
return nil, err
}
return logger, nil
}
// Log ...
func (l *Logger) Log(format string, v ...interface{}) {
if l.outputFile == nil {
return
}
l.mu.Lock()
defer l.mu.Unlock()
msg := fmt.Sprintf(format, v...)
s := time.Now().Format(dateTimeFormat) + ": " + msg + "\n"
if l.shouldSplit(len(s)) {
l.split()
}
l.outputFile.WriteString(s)
}
// Print ...
func (l *Logger) Print(format string, v ...interface{}) {
msg := fmt.Sprintf(format, v...)
fmt.Printf("%s: %s\n", time.Now().Format(dateTimeFormat), msg)
}
// Trace ...
func (l *Logger) Trace(format string, v ...interface{}) string {
if l.outputFile == nil {
return ""
}
l.mu.Lock()
defer l.mu.Unlock()
s := getTrace(format, v...) + "\n"
if l.shouldSplit(len(s)) {
l.split()
}
l.outputFile.WriteString(s)
return s
}
// PrintTrace ...
func (l *Logger) PrintTrace(format string, v ...interface{}) {
s := getTrace(format, v...)
fmt.Printf("%s\n", s)
}
// PrintAndTrace ...
func (l *Logger) PrintAndTrace(format string, v ...interface{}) {
t := l.Trace(format, v...)
fmt.Println(t)
}
// Close ...
func (l *Logger) Close() error {
if l.outputFile == nil {
return nil
}
return l.outputFile.Close()
}
func (l *Logger) split() error {
if l.outputFile == nil {
return nil
}
// close old file
err := l.outputFile.Close()
if err != nil {
return err
}
// open new file
l.splitCount++
path := filepath.Join(l.directory, l.outputFileName+fmt.Sprintf("(%d)", l.splitCount)+".txt")
l.outputFile, err = os.Create(path)
return err
}
func (l *Logger) shouldSplit(nextEntrySize int) bool {
stats, _ := l.outputFile.Stat()
return int64(nextEntrySize) >= (l.maxFileSize - stats.Size())
}
func printJSON(in []byte) (out []byte, err error) {
var buf bytes.Buffer
err = json.Indent(&buf, in, "", " ")
return buf.Bytes(), err
}
// GetOutDir ...
func (l *Logger) GetOutDir() string {
return l.directory
}