main.go
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package gologger
import (
"fmt"
"os"
"path/filepath"
"runtime"
"sync"
"time"
)
const (
MaxLogSize5MB int64 = 5 * 1024 * 1024
MaxLogSize1MB int64 = 1 * 1024 * 1024
MaxLogSize500KB int64 = 500 * 1024
MaxLogSize100KB int64 = 100 * 1024
MaxLogSize512B int64 = 512
logDirName = "log"
)
type Logger struct {
mu *sync.Mutex
outputFile *os.File
outputFileName string
maxFileSize int64
}
func New(name string, maxFileSize int64) (logger *Logger, err error) {
logger = &Logger{}
logger.outputFileName = name + "-log"
logger.mu = &sync.Mutex{}
logger.maxFileSize = maxFileSize
err = os.Mkdir(logDirName, os.ModePerm)
if err != nil {
if !os.IsExist(err) {
fmt.Printf("logger: mkdir: couldn't create event log directory\n")
return nil, err
}
}
timestamp := "_" + time.Now().Format(time.RFC3339)
path := filepath.Join(logDirName, logger.outputFileName+timestamp+".txt")
logger.outputFile, err = os.Create(path)
if err != nil {
fmt.Printf("logger: new: couldn't create event log file\n")
return nil, err
}
return logger, nil
}
func (logger *Logger) Print(format string, v ...interface{}) {
msg := fmt.Sprintf(format, v...)
fmt.Printf(time.Now().Format(time.RFC3339) + ": " + msg + "\n")
}
func (logger *Logger) Log(format string, v ...interface{}) {
if logger.outputFile != nil {
logger.mu.Lock()
defer logger.mu.Unlock()
msg := fmt.Sprintf(format, v...)
s := time.Now().Format(time.RFC3339) + ": " + msg + "\n"
if logger.shouldSplit(len(s)) {
logger.split()
}
logger.outputFile.WriteString(s)
}
}
// TODO(marko)
/*
func (logger *Logger) LogHTTPRequest(req *http.Request) {
if logger.outputFile != nil {
logger.mu.Lock()
defer logger.mu.Unlock()
msg := fmt.Sprintf(format, v...)
if logger.shouldSplit(len(s)) {
logger.split()
}
logger.outputFile.WriteString(time.Now().Format(time.RFC3339) + ": " + msg + "\n")
}
}
*/
func (logger *Logger) Trace(format string, v ...interface{}) {
if logger.outputFile != nil {
logger.mu.Lock()
defer logger.mu.Unlock()
_, file, line, ok := runtime.Caller(1)
s := ""
msg := fmt.Sprintf(format, v...)
if ok {
s = fmt.Sprintf("%s: %s %d: %s\n", time.Now().Format(time.RFC3339), file, line, msg)
} else {
s = fmt.Sprintf(time.Now().Format(time.RFC3339) + ": [can't retreive stack details]:" + msg + "\n")
}
if logger.shouldSplit(len(s)) {
logger.split()
}
logger.outputFile.WriteString(s)
}
}
func (logger *Logger) Close() {
if logger.outputFile != nil {
err := logger.outputFile.Close()
if err != nil {
fmt.Printf("logger: on exit: couldn't close event log file\n")
}
}
}
func (l *Logger) split() {
timestamp := "_" + time.Now().Format(time.RFC3339)
// close old file
err := l.outputFile.Close()
if err != nil {
fmt.Printf("logger: split: couldn't close event file\n")
return
}
// open new file
var errnew error
path := filepath.Join(logDirName, l.outputFileName+timestamp)
l.outputFile, errnew = os.Create(path)
if errnew != nil {
fmt.Printf("logger: split: couldn't create event log file\n")
}
}
func (l *Logger) shouldSplit(nextEntrySize int) bool {
stats, _ := l.outputFile.Stat()
return int64(nextEntrySize) >= (l.maxFileSize - stats.Size())
}