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: miner.rs
    path of file: ./repos/saito-rust/src
    
    the code of the file until where you have to start completion: use crate::{
    consensus::SaitoMessage,
    crypto::{generate_random_bytes, hash, SaitoHash, SaitoPublicKey},
    golden_ticket::GoldenTicket,
    wallet::Wallet,
};
use std::{sync::Arc, thread::sleep, time::Duration};
use tokio::sync::{broadcast, mpsc, RwLock};

#[derive(Debug, Clone)]
pub enum MinerMessage {
    StartMining,
    StopMining,
    MineGoldenTicket,
}

pub struct Miner {
    pub is_active: bool,
    pub target: SaitoHash,
    pub difficulty: u64,
    pub wallet_lock: Arc<RwLock<Wallet>>,
    broadcast_channel_sender: Option<broadcast::Sender<SaitoMessage>>,
}

impl Miner {
    pub fn new(wallet_lock: Arc<RwLock<Wallet>>) -> Miner {
        Miner {
            is_active: false,
         
    
    pub async fn mine(&mut self) {
        if self.is_active {
            let publickey: SaitoPublicKey;

            {
                let wallet = self.wallet_lock.read().await;
                publickey = wallet.get_publickey();
            }

            let random_bytes = hash(&generate_random_bytes(32));
            let solution = GoldenTicket::generate_solution(self.target, random_bytes, publickey);
            if GoldenTicket::is_valid_solution(solution, self.difficulty) {
                {
                    let gt = GoldenTicket::new(self.target, random_bytes, publickey);

                    if !self.broadcast_channel_sender.is_none() {
                        self.broadcast_channel_sender
                            .as_ref()
                            .unwrap()
                            .send(SaitoMessage::MinerNewGoldenTicket { ticket: gt })
                            .expect("error: MinerNewGoldenTicket message failed to send");
                    }
                }

                // stop mining
                self.set_is_active(false);
            }
        }
    }