multi-gpu-miner.rs

use std::sync::{Arc, Mutex};
use std::thread;

// Mockup of a CUDA-accelerated Keccak hash function
extern "C" {
    fn keccakHash(input: *const u8, output: *mut u8, digestSize: u32);
}

// Mining job structure
struct MiningJob {
    header: Vec<u8>,
    target: u64,
}

// Miner configuration
struct MinerConfig {
    num_threads: usize,
}

// Miner state
struct MinerState {
    config: MinerConfig,
    jobs: Arc<Mutex<Vec<MiningJob>>>,
}

// Function to simulate CUDA-accelerated Keccak hash function
fn simulate_keccak_hash(input: &[u8]) -> Vec<u8> {
    // Simulated hash function implementation
    let mut output = vec![0; 32]; // Simulate 256-bit hash output
    unsafe {
        keccakHash(input.as_ptr(), output.as_mut_ptr(), 256);
    }
    output
}

// Worker function for each mining thread
fn mining_worker(state: Arc<MinerState>) {
    loop {
        // Get a mining job
        let job = {
            let mut jobs = state.jobs.lock().unwrap();
            if let Some(job) = jobs.pop() {
                job
            } else {
                // No jobs available, exit the thread
                return;
            }
        };

        // Attempt to find a valid solution
        let mut nonce = 0u64;
        loop {
            // Construct the block header with the nonce
            let mut header_with_nonce = job.header.clone();
            header_with_nonce.extend_from_slice(&nonce.to_le_bytes());

            // Hash the header with the nonce
            let hash = simulate_keccak_hash(&header_with_nonce);

            // Check if the hash meets the target
            if u64::from_le_bytes(hash[..8].try_into().unwrap()) < job.target {
                // Valid solution found, submit it to the mining pool
                println!("Valid solution found: nonce {}", nonce);
                // Simulated submission to the pool
                // pool.submit_solution(header_with_nonce.clone(), hash.clone());

                // Break the inner loop to move to the next job
                break;
            }

            // Increment the nonce for the next iteration
            nonce += 1;

            // Check if another job has been assigned in the meantime
            {
                let jobs = state.jobs.lock().unwrap();
                if jobs.is_empty() {
                    // No more jobs available, exit the thread
                    return;
                }
            }
        }
    }
}

fn main() {
    // Initialize miner configuration and state
    let config = MinerConfig { num_threads: 4 };
    let state = Arc::new(MinerState {
        config: config.clone(),
        jobs: Arc::new(Mutex::new(Vec::new())),
    });

    // Spawn mining threads
    let mut threads = vec![];
    for _ in 0..config.num_threads {
        let state_clone = state.clone();
        let thread = thread::spawn(move || mining_worker(state_clone));
        threads.push(thread);
    }

    // Simulated mining pool providing jobs
    let pool = Arc::clone(&state.jobs);
    for i in 0..10 {
        let job = MiningJob {
            header: format!("BlockHeader{}", i).into_bytes(),
            target: 1000, // Simulated target value
        };
        pool.lock().unwrap().push(job);
    }

    // Wait for all mining threads to finish
    for thread in threads {
        thread.join().unwrap();
    }
}