Read Logfiles line by line in rust

readlines.rs

use std::fs::File;
use std::io::Seek;
use std::io::BufRead;
use std::io::SeekFrom;
use std::io::BufReader;



#[cfg(windows)]
const OS_STRING_ENDING: &'static str = "\r\n";
#[cfg(not(windows))]
const OS_STRING_ENDING: &'static str = "\n";



pub fn current_size(path : &str) -> std::io::Result<u64> {
    Ok(File::open(path)?.metadata()?.len())
}

  
  
pub fn read_lines(path : &str, time : u64, offset : u64) -> std::io::Result<()> {
  
    let mut position = offset;
  
    loop {
  
        let file = File::open(path)?;
  
        let mut reader = BufReader::new(file);
  
        position = reader.seek(SeekFrom::Start(position))?;

        for resline in reader.lines() {
  
            let line = resline?;
  
            if line.len() == 0 {
                continue;
            }
  
            // print line
            println!("> {}", line);

            position += (line.as_bytes().len() + OS_STRING_ENDING.len()) as u64;
  
        }
  
        std::thread::sleep(std::time::Duration::from_millis(time));
  
    }
  
}