You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: service.rs
    path of file: ./repos/vscode/cli/src/tunnels
    
    the code of the file until where you have to start completion: /*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

use std::path::{Path, PathBuf};

use async_trait::async_trait;

use crate::log;
use crate::state::LauncherPaths;
use crate::util::errors::{wrap, AnyError};
use crate::util::io::{tailf, TailEv
    
pub(crate) async fn tail_log_file(log_file: &Path) -> Result<(), AnyError> {
	if !log_file.exists() {
		println!("The tunnel service has not started yet.");
		return Ok(());
	}

	let file = std::fs::File::open(log_file).map_err(|e| wrap(e, "error opening log file"))?;
	let mut rx = tailf(file, 20);
	while let Some(line) = rx.recv().await {
		match line {
			TailEvent::Line(l) => print!("{}", l),
			TailEvent::Reset => println!("== Tunnel service restarted =="),
			TailEvent::Err(e) => return Err(wrap(e, "error reading log file").into()),
		}
	}

	Ok(())
}