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: main.rs
    path of file: ./repos/rust-bible/part3/kafka-consumer/src
    
    the code of the file until where you have to start completion: use kafka::consumer::{Consumer, FetchOffset, GroupOffsetStorage};
use kafka::error::Error as KafkaError;
// use kafka::producer::AsBytes;
use log::{error, info};
use std::env;
use std::thread;
use std::time::Duration;
fn main() {
    env::set_v
    
fn main() {
    env::set_var("RUST_LOG", "debug");
    env_logger::init();
    let broker = "localhost:9092".to_owned();
    let topic = "my-topic";
    let group = "my-group-2";

    info!("consumer message begin...");
    // consumer message
    if let Err(err) = consumer_message(group, topic, vec![broker]) {
        error!("consumer message err:{}", err);
    }
}