Fileopen

Firereopen provides a write-only file interface that will reopen the given file if it is moved/removed in meantime, such as when using logrotate.

It uses inodes to see the change.

Currently it uses simple polling with settable interval.

Tested on Linux only

Example:

package main

import (
	"fmt"
	"github.com/XANi/go-filereopen"
	"time"
)

func main() {
	fd, err := filereopen.OpenFileForAppend("test.log", 0644)
	if err != nil {
		fmt.Printf("can't open: %s\n", err)
	}
	f.SetInterval(time.Second * 10) // defaults to once per second
	for {
		time.Sleep(time.Second)
		n, err := fmt.Fprintf(fd, "date: %s\n", time.Now().String())
		if err != nil {
			fmt.Printf("err: %s[%d]\n", err, n)
		}
	}
}

Reopen can also be triggered by f.Reopen().

Underlying filedescriptor will only be swapped if opening a new one was successful. The old filedescriptor will be synced immediately after the swap and closed few seconds later

Reopen is retried indefinitely, errors could be retrieved by using SetErrorFunction to set the error handler