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: tcp.rs
    path of file: ./repos/sozu/lib/examples
    
    the code of the file until where you have to start completion: #![allow(unused_must_use)]
extern crate sozu_lib;
#[macro_use]
extern crate sozu_command_lib;

use std::thread;


    
fn main() -> anyhow::Result<()> {
    setup_default_logging(true, "info", "EXAMPLE");

    info!("starting up");

    let (mut command, channel) =
        Channel::generate(1000, 10000).with_context(|| "should create a channel")?;

    let jg = thread::spawn(move || {
        let max_buffers = 500;
        let buffer_size = 16384;
        let listener = TcpListenerConfig {
            address: SocketAddress::new_v4(127, 0, 0, 1, 8080),
            ..Default::default()
        };
        setup_default_logging(true, "debug", "TCP");
        sozu_lib::tcp::testing::start_tcp_worker(listener, max_buffers, buffer_size, channel);
    });

    let tcp_front = RequestTcpFrontend {
        cluster_id: String::from("test"),
        address: SocketAddress::new_v4(127, 0, 0, 1, 8080),
        ..Default::default()
    };
    let tcp_backend = AddBackend {
        cluster_id: String::from("test"),
        backend_id: String::from("test-0"),
        address: SocketAddress::new_v4(127, 0, 0, 1, 1026),
        load_balancing_parameters: Some(LoadBalancingParams::default()),
        sticky_id: None,
        backup: None,
    };

    command.write_message(&WorkerRequest {
        id: String::from("ID_ABCD"),
        content: RequestType::AddTcpFrontend(tcp_front).into(),
    });

    command.write_message(&WorkerRequest {
        id: String::from("ID_EFGH"),
        content: RequestType::AddBackend(tcp_backend).into(),
    });

    info!("TCP -> {:?}", command.read_message());
    info!("TCP -> {:?}", command.read_message());

    let _ = jg.join();
    info!("good bye");
    Ok(())
}