The file is not being written. What is the problem?

Question

go

Good afternoon.
I'm trying to make friends with journaling, it doesn't work out very well:

import (
"log"
)
/*******************/
type Client struct {
  Logger        *log.Logger
}

ex, _ := os.Executable()
  path := filepath.Dir(ex)
  pathlog := path + string(filepath.Separator) + "log" + string(filepath.Separator)
  if _, err := os.Stat(pathlog); os.IsNotExist(err) {
    _ = os.MkdirAll(pathlog, os.ModePerm)
  }
  f, err := os.OpenFile(pathlog + time.Now().Format("02-01-2006_15-04-05") +".log", os.O_CREATE,0777)
  if err != nil {
    panic(err)
  }
  defer f.Close()

  //f.Sync()

  client.Logger = log.New(bufio.NewWriter(f), version, log.Lshortfile)
  client.Logger.Print("Test text")

The directory is created if it does not exist. The file is being created. BUT! nothing is written to the file.
What is the reason?

Answer 1

bufio.NewWriter(f)
This thing buffers the write to disk, it must be flashed separately from the file itself. Without this wrapper (New(f, ...)) the entry goes to the log.

Answer 2

I can assume that this is it: bufio .NewWriter(f).
Either do Flush() or use an unbuffered io.Writer.

w := bufio.NewWriter(f)
defer w.Flush()
client.Logger = log.New(w, version, log.Lshortfile)