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logger.go
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logger.go
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package util
import (
"github.com/rs/zerolog/log"
"io"
"io/fs"
"io/ioutil"
"os"
"path"
"strings"
"time"
)
const logFilePrefix = "kt-"
var BackgroundLogger = io.Discard
func PrepareLogger(enable bool) {
if !enable {
return
}
if tmpFile, err := ioutil.TempFile(os.TempDir(), logFilePrefix); err != nil {
log.Warn().Err(err).Msgf("Cannot create background log file")
} else {
log.Debug().Msgf("Background task log to %s", tmpFile.Name())
FixFileOwner(tmpFile.Name())
BackgroundLogger = FileWriter{tmpFile}
}
}
type FileWriter struct {
file *os.File
}
// Write log text
func (f FileWriter) Write(p []byte) (n int, err error) {
return f.file.Write(p)
}
// CleanBackgroundLogs delete expired log files
func CleanBackgroundLogs() {
files, err := ioutil.ReadDir(os.TempDir())
if err != nil {
log.Warn().Msgf("Failed to list background logs")
return
}
for _, f := range files {
if strings.HasPrefix(f.Name(), logFilePrefix) && isExpired(f) {
err = os.Remove(path.Join(os.TempDir(), f.Name()))
if err != nil {
log.Debug().Err(err).Msgf("Failed to removed expired log %s", f.Name())
} else {
log.Debug().Msgf("Removed expired log %s", f.Name())
}
}
}
}
// isExpired check whether file haven't been modified over 24 hours
func isExpired(info fs.FileInfo) bool {
return info.ModTime().Unix() < time.Now().Unix() - (3600 * 24)
}