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clean_files.go
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clean_files.go
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package rotatefile
import (
"os"
"time"
"github.com/gookit/goutil/fsutil"
)
// CConfig struct for clean files
type CConfig struct {
// BackupNum max number for keep old files.
// 0 is not limit, default is 20.
BackupNum uint `json:"backup_num" yaml:"backup_num"`
// BackupTime max time for keep old files, unit is hours.
//
// 0 is not limit, default is a week.
BackupTime uint `json:"backup_time" yaml:"backup_time"`
// Compress determines if the rotated log files should be compressed
// using gzip. The default is not to perform compression.
Compress bool `json:"compress" yaml:"compress"`
// FileDirs list
FileDirs []string `json:"file_dirs" yaml:"file_dirs"`
// TimeClock for clean files
TimeClock Clocker
// skip error
// TODO skipError bool
}
// AddFileDir for clean
func (c *CConfig) AddFileDir(dirs ...string) *CConfig {
c.FileDirs = append(c.FileDirs, dirs...)
return c
}
// NewCConfig instance
func NewCConfig() *CConfig {
return &CConfig{
BackupNum: DefaultBackNum,
BackupTime: DefaultBackTime,
}
}
// FilesClear multi files by time. TODO
// use for rotate and clear other program produce log files
type FilesClear struct {
// mu sync.Mutex
cfg *CConfig
namePattern string
filepathDirs []string
// full file path patterns
filePatterns []string
// file max backup time. equals CConfig.BackupTime * time.Hour
backupDur time.Duration
}
// NewFilesClear instance
func NewFilesClear(cfg *CConfig) *FilesClear {
if cfg == nil {
cfg = NewCConfig()
}
return &FilesClear{
cfg: cfg,
}
}
// WithConfigFn for custom settings
func (r *FilesClear) WithConfigFn(fn func(c *CConfig)) *FilesClear {
fn(r.cfg)
return r
}
//
// ---------------------------------------------------------------------------
// clean backup files
// ---------------------------------------------------------------------------
//
const flushInterval = 60 * time.Second
// CleanDaemon daemon clean old files by config
func (r *FilesClear) CleanDaemon() {
if r.cfg.BackupNum == 0 && r.cfg.BackupTime == 0 {
return
}
for range time.NewTicker(flushInterval).C {
if err := r.Clean(); err != nil {
printErrln("files-clear: clean old files error:", err)
}
}
}
// Clean old files by config
func (r *FilesClear) Clean() (err error) {
// clear by time, can also clean by number
if r.cfg.BackupTime > 0 {
cutTime := r.cfg.TimeClock.Now().Add(-r.backupDur)
for _, fileDir := range r.filepathDirs {
// eg: /tmp/ + error.log.* => /tmp/error.log.*
filePattern := fileDir + r.namePattern
err = r.cleanByBackupTime(filePattern, cutTime)
if err != nil {
return err
}
}
for _, pattern := range r.filePatterns {
err = r.cleanByBackupTime(pattern, cutTime)
if err != nil {
break
}
}
return
}
if r.cfg.BackupNum == 0 {
return nil
}
// clear by number.
bckNum := int(r.cfg.BackupNum)
for _, fileDir := range r.filepathDirs {
pattern := fileDir + r.namePattern
if err = r.cleanByBackupNum(pattern, bckNum); err != nil {
return err
}
}
for _, pattern := range r.filePatterns {
if err = r.cleanByBackupNum(pattern, bckNum); err != nil {
break
}
}
return
}
func (r *FilesClear) cleanByBackupNum(filePattern string, bckNum int) (err error) {
keepNum := 0
err = fsutil.GlobWithFunc(filePattern, func(oldFile string) error {
stat, err := os.Stat(oldFile)
if err != nil {
return err
}
if stat.IsDir() {
return nil
}
if keepNum < bckNum {
keepNum++
}
// remove expired files
return os.Remove(oldFile)
})
return
}
func (r *FilesClear) cleanByBackupTime(filePattern string, cutTime time.Time) (err error) {
oldFiles := make([]string, 0, 8)
// match all old rotate files. eg: /tmp/error.log.*
err = fsutil.GlobWithFunc(filePattern, func(filePath string) error {
stat, err := os.Stat(filePath)
if err != nil {
return err
}
if stat.IsDir() {
return nil
}
if stat.ModTime().After(cutTime) {
oldFiles = append(oldFiles, filePath)
return nil
}
// remove expired files
return os.Remove(filePath)
})
// clear by number.
maxNum := int(r.cfg.BackupNum)
if maxNum > 0 && len(oldFiles) > maxNum {
for idx := 0; len(oldFiles) > maxNum; idx++ {
err = os.Remove(oldFiles[idx])
if err != nil {
break
}
}
}
return
}