Blog: (http://capykoa.com/articles/11)
I needed a simple utility to follow rapidly growing adserver logrotating logs that I can process dynamically and in real time.
Features
- Default behavior supports logrotating files.
- Timeout option to wait on new files that hasn't been created yet.
- Supports high reads. On my 2013 Macbook Pro, I was able benchmark at more than 150,000 lines/second (
go test). However, expected performance on production should be much higher. - Lightweight and low memory footprint
- Partly inspired by ActiveState/tail
package main
import (
"flag"
"fmt"
"log"
"github.com/dleung/gotail"
)
var fname string
func main() {
flag.StringVar(&fname, "file", "", "File to tail")
flag.Parse()
// Set timeout to 0 to automatically fail if file isn't found
tail, err := gotail.NewTail(fname, gotail.Config{Timeout: 10})
if err != nil {
log.Fatalln(err)
}
// lines on the tail.Lines channel for new lines.
for line := range tail.Lines {
fmt.Println(line)
}
}