func writeToDisk(m *syslog.Message) error {
file, err := getLogFile(m)
if err != nil {
return err
}
bytes := []byte(m.String() + "\n")
file.Write(bytes)
return nil
}
func getLogFile(m *syslog.Message) (io.Writer, error) {
r := regexp.MustCompile(`^.* ([a-z-]+)\[[a-z0-9\.]+\].*`)
match := r.FindStringSubmatch(m.String())
if match == nil {
return nil, errors.New("Could not find app name in message")
}
appName := match[1]
filePath := path.Join(logRoot, appName+".log")
// check if file exists
exists, err := fileExists(filePath)
if err != nil {
return nil, err
}
// return a new file or the existing file for appending
var file io.Writer
if exists {
file, err = os.OpenFile(filePath, os.O_RDWR|os.O_APPEND, 0644)
} else {
file, err = os.OpenFile(filePath, os.O_RDWR|os.O_CREATE, 0644)
}
return file, err
}