multi-gpu-miner.js

const { Worker, isMainThread, parentPort, workerData } = require('worker_threads');

// Mockup of a simulated Keccak hash function
function simulateKeccakHash(input) {
    // Simulated hash function implementation
    return "0000" + Math.random().toString(16).slice(2, 66); // Simulate 256-bit hash output with leading zeros
}

// Worker function representing the mining logic
function miningWorker() {
    const { job } = workerData;

    // Attempt to find a valid solution
    let nonce = 0;
    while (true) {
        // Construct the block header with the nonce
        const headerWithNonce = job.header + nonce.toString();

        // Hash the header with the nonce
        const hash = simulateKeccakHash(headerWithNonce);

        // Check if the hash meets the target
        if (parseInt(hash, 16) < job.target) {
            // Valid solution found, submit it to the mining pool
            console.log(`Valid solution found by Worker ${workerData.workerId}: nonce ${nonce}`);
            // Simulated submission to the pool
            // submitSolution(headerWithNonce, hash);

            // Notify the main thread that a solution has been found
            parentPort.postMessage({ solution: { header: headerWithNonce, hash }, workerId: workerData.workerId });
            return;
        }

        // Increment the nonce for the next iteration
        nonce++;
    }
}

// Main thread logic
if (isMainThread) {
    // Simulated mining pool providing jobs
    const pool = [];
    for (let i = 0; i < 10; i++) {
        const job = {
            header: `BlockHeader${i}`,
            target: 1000, // Simulated target value
        };
        pool.push(job);
    }

    // Start mining workers
    const numWorkers = 4;
    const workers = [];
    for (let i = 0; i < numWorkers; i++) {
        const worker = new Worker(__filename, { workerData: { job: pool[i], workerId: i + 1 } });
        workers.push(worker);
    }

    // Listen for messages from workers
    workers.forEach((worker, index) => {
        worker.on('message', (message) => {
            console.log(`Received message from Worker ${index + 1}:`, message);
        });
    });
}
// Worker thread logic
else {
    miningWorker();
}