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picolog.go
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picolog.go
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package picolog
import (
"compress/gzip"
"fmt"
"io"
"io/ioutil"
"os"
"strings"
"sync"
"time"
)
type LogRotator struct {
filename string
file *os.File
count int64
lock *sync.Mutex
prefix string
logPath string
}
func (lr *LogRotator) Log(line []byte) {
lr.lock.Lock()
defer lr.lock.Unlock()
lr.count += int64(len(line))
if lr.count > 50000000 {
lr.rotate()
}
fmt.Fprintln(lr.file, string(line))
}
func (lr *LogRotator) LogString(logItem string) {
lr.Log([]byte(logItem))
}
func (lr *LogRotator) fileName() {
t := time.Now()
lr.filename = lr.prefix + "_log_" + t.Format("15_04_05") + ".log"
}
func (lr *LogRotator) rotate() {
fmt.Println("Rotating")
if lr.file != nil {
lr.file.Close()
}
lr.fileName()
lr.open()
}
func (lr *LogRotator) open() {
files, err := ioutil.ReadDir(lr.logPath)
if err == nil && len(files) > 3 {
zipFile, err := os.Create(lr.logPath + "backup" + time.Now().Format("15_04_05") + ".gzip")
if err != nil {
fmt.Println(err)
}
gzipped := gzip.NewWriter(zipFile)
for _, f := range files {
if strings.Index(f.Name(), ".gzip") > 0 || strings.Index(f.Name(), lr.prefix+"_") != 0 {
continue
}
s, _ := os.Open(lr.logPath + f.Name())
io.Copy(gzipped, s)
s.Close()
_ = os.Remove(lr.logPath + f.Name())
}
gzipped.Flush()
gzipped.Close()
zipFile.Close()
}
if lr.filename == "" {
lr.fileName()
}
_, err = os.Stat(lr.logPath + lr.filename)
if err != nil {
lr.file, err = os.Create(lr.logPath + lr.filename)
if err != nil {
fmt.Println(err)
}
} else {
lr.file, err = os.Open(lr.logPath + lr.filename)
if err != nil {
fmt.Println(err)
}
}
stat, err := os.Stat(lr.logPath + lr.filename)
if err != nil {
fmt.Println(err)
return
}
lr.count = stat.Size()
}
func New(prefix string) *LogRotator {
lr := &LogRotator{
prefix: prefix,
logPath: getLogPath(prefix),
lock: &sync.Mutex{},
}
createIfNotExist(lr.logPath)
lr.open()
return lr
}
func (lr *LogRotator) Close() {
if lr.file != nil {
lr.file.Close()
}
}
func createIfNotExist(path string) {
if _, err := os.Stat(path); err != nil {
os.MkdirAll(path, 777)
}
}