// CreateChannel opens a logfile and creates a channel of log
// Entry structs. It keeps the file open and scans it for new
// log file entries forever.
func CreateChannel(file string) (chan Entry, error) {
lineCh := make(chan Entry, 1024)
if t, err := tail.TailFile(file, tail.Config{Follow: true}); err == nil {
// start tailing the logfile in background
go func() {
// writing to a closed channel panics - hence
// we need to recover here since closing is our
// "official" way to stop tailing
defer func() {
t.Stop()
recover()
}()
for line := range t.Lines {
if entry, errParse := ParseLine(line.Text); errParse == nil {
// blocking when buffer is full
lineCh <- entry
}
}
}()
} else {
return nil, err
}
return lineCh, nil
}
func tailFile(filename string, config tail.Config, done chan bool) {
defer func() { done <- true }()
t, err := tail.TailFile(filename, config)
if err != nil {
fmt.Println(err)
return
}
for line := range t.Lines {
fmt.Println(line.Text)
}
err = t.Wait()
if err != nil {
fmt.Println(err)
}
}