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: bench_logger.rs
    path of file: ./repos/sozu/command/examples
    
    the code of the file until where you have to start completion: //! This file is used to bench the logger of Sozu by logging random lines.
//! You can change the number of logs, log target, log filter and if they are colored with env
//! variables.

#[macro_use]
extern crate sozu_command_lib;

use std::time::Instant;

use rand::{rngs::StdRng, Rng, RngCore, SeedableRng};

use sozu_command_lib::logging::setup_logging;

struct LogLi
    
fn main() {
    let mut rng: StdRng = SeedableRng::seed_from_u64(54321);

    let n: usize = std::env::var("BENCH_LOG_ITERS")
        .ok()
        .and_then(|n| n.parse().ok())
        .unwrap_or(1000);
    let colored = std::env::var("BENCH_LOG_COLOR")
        .map(|v| v == "true")
        .unwrap_or(false);
    let pre_generate = std::env::var("BENCH_LOG_PREGEN")
        .map(|v| v == "true")
        .unwrap_or(false);
    let target = std::env::var("BENCH_LOG_TARGET").unwrap_or("stdout".to_string());
    let filter = std::env::var("BENCH_LOG_FILTER").unwrap_or("trace".to_string());

    eprintln!(
        "n={n}, pre_generate={pre_generate}, target={target}, colored={colored}, filter={filter}"
    );
    setup_logging(&target, colored, None, None, None, &filter, "WRK-01");

    let mut pre_generated_log_iterator;
    let mut log_iterator = std::iter::repeat(())
        .take(n)
        .map(|_| random_log_line(&mut rng));

    let log_iterator = if pre_generate {
        // the pre generated iterator allocates all LogLines to avoid generating them on the fly
        // generation takes between 15% and 20% of the time
        pre_generated_log_iterator = log_iterator.collect::<Vec<_>>().into_iter();
        &mut pre_generated_log_iterator as &mut dyn Iterator<Item = LogLine>
    } else {
        &mut log_iterator as &mut dyn Iterator<Item = LogLine>
    };

    let start = Instant::now();
    for LogLine {
        arg0,
        arg1,
        arg2,
        log_level,
    } in log_iterator.into_iter()
    {
        match log_level % 5 {
            0 => error!(
                "first argument: {}, second: {}, third: {}",
                arg0, arg1, arg2
            ),
            1 => warn!(
                "first argument: {}, second: {}, third: {}",
                arg0, arg1, arg2
            ),
            2 => info!(
                "first argument: {}, second: {}, third: {}",
                arg0, arg1, arg2
            ),
            3 => debug!(
                "first argument: {}, second: {}, third: {}",
                arg0, arg1, arg2
            ),
            _ => trace!(
                "first argument: {}, second: {}, third: {}",
                arg0,
                arg1,
                arg2
            ),
        }
    }
    eprintln!("logs took {:?}", start.elapsed());
}