diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..c6bba59 --- /dev/null +++ b/.gitignore @@ -0,0 +1,130 @@ +# Logs +logs +*.log +npm-debug.log* +yarn-debug.log* +yarn-error.log* +lerna-debug.log* +.pnpm-debug.log* + +# Diagnostic reports (https://nodejs.org/api/report.html) +report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json + +# Runtime data +pids +*.pid +*.seed +*.pid.lock + +# Directory for instrumented libs generated by jscoverage/JSCover +lib-cov + +# Coverage directory used by tools like istanbul +coverage +*.lcov + +# nyc test coverage +.nyc_output + +# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files) +.grunt + +# Bower dependency directory (https://bower.io/) +bower_components + +# node-waf configuration +.lock-wscript + +# Compiled binary addons (https://nodejs.org/api/addons.html) +build/Release + +# Dependency directories +node_modules/ +jspm_packages/ + +# Snowpack dependency directory (https://snowpack.dev/) +web_modules/ + +# TypeScript cache +*.tsbuildinfo + +# Optional npm cache directory +.npm + +# Optional eslint cache +.eslintcache + +# Optional stylelint cache +.stylelintcache + +# Microbundle cache +.rpt2_cache/ +.rts2_cache_cjs/ +.rts2_cache_es/ +.rts2_cache_umd/ + +# Optional REPL history +.node_repl_history + +# Output of 'npm pack' +*.tgz + +# Yarn Integrity file +.yarn-integrity + +# dotenv environment variable files +.env +.env.development.local +.env.test.local +.env.production.local +.env.local + +# parcel-bundler cache (https://parceljs.org/) +.cache +.parcel-cache + +# Next.js build output +.next +out + +# Nuxt.js build / generate output +.nuxt +dist + +# Gatsby files +.cache/ +# Comment in the public line in if your project uses Gatsby and not Next.js +# https://nextjs.org/blog/next-9-1#public-directory-support +# public + +# vuepress build output +.vuepress/dist + +# vuepress v2.x temp and cache directory +.temp +.cache + +# Docusaurus cache and generated files +.docusaurus + +# Serverless directories +.serverless/ + +# FuseBox cache +.fusebox/ + +# DynamoDB Local files +.dynamodb/ + +# TernJS port file +.tern-port + +# Stores VSCode versions used for testing VSCode extensions +.vscode-test + +# yarn v2 +.yarn/cache +.yarn/unplugged +.yarn/build-state.yml +.yarn/install-state.gz +.pnp.* diff --git a/README.md b/README.md index 7ce4d63..c2dcfb2 100644 --- a/README.md +++ b/README.md @@ -1,3 +1,69 @@ -# request-for-code +# Bitcoin-like Server Project -This repository contains a bunch of interesting requests for people to code. These are things I've always wanted to build but don't get the time to get to them. +## Overview + +This project implements a simplified Bitcoin-like server, designed to simulate key aspects of the Bitcoin network. The project consists of a central WebSocket server and multiple miner servers. Each miner maintains its own transaction pool, mines blocks at regular intervals, and interacts with the central server to receive new transactions. + +## Architecture + +The project consists of the following components: + +1. **Central Server** (`centralServer.js`) + - Acts as the central hub for broadcasting transactions to all connected miners. + - Manages WebSocket connections and ensures that all miners receive the latest transactions. + - Facilitates decentralized block mining by keeping miners in sync with the transaction pool. + +2. **Miner Server** (`minerServer.js`) + - Each miner operates independently, maintaining its own transaction pool. + - Mines blocks at a fixed interval (e.g., every 30 seconds). + - Interacts with the central server to receive new transactions and broadcast mined blocks. + +3. **Blockchain Utilities** (`blockchainUtils.js`) + - Contains utility functions for blockchain operations, including block creation, transaction handling, and validation. + - Ensures consistent and reliable blockchain functionality across all servers. + +## Usage + +Use the `fund-wallets.txt` file to view the initial accounts created to send transactions. + +### API Endpoints + +The following APIs are exposed via an Express server: + +- **Send Transaction**: Allows sending transactions to a recipient. + - **Endpoint**: `POST /sendTransaction` + - **Request Body**: + - `recipient` (string): The recipient's address (40 characters). + - `amount` (number): The amount to send (must be greater than 0). + - `privateKey` (string): The private key for signing the transaction (64 characters). + - **Response**: `Transaction processed` if successful, with error messages for invalid inputs. + +- **Get Balances**: Retrieves the balance of all accounts. + - **Endpoint**: `GET /getBalances` + - **Response**: A JSON object containing all account balances. + +- **Get Block Height**: Retrieves the current block height of the blockchain. + - **Endpoint**: `GET /getBlockHeight` + - **Response**: A JSON object with the current block height. + +- **Get Balance**: Retrieves the balance of a specific address. + - **Endpoint**: `GET /getBalance/:address` + - **Response**: A JSON object with the balance of the specified address. + +### Running the Servers + +To run the project, follow these steps: + +1. **Start the Central Server**: + ```bash + node centralServer.js + +2. **Start the Miner Servers**: + ```bash + node minerServer.js + ``` + +3. **Access the API Endpoints**: + - Send transactions to the central server using the provided APIs. + - View the balances of all accounts using the `/getBalances` endpoint. + - Monitor the block height using the `/getBlockHeight` endpoint. \ No newline at end of file diff --git a/blockchainUtils.js b/blockchainUtils.js new file mode 100644 index 0000000..139f369 --- /dev/null +++ b/blockchainUtils.js @@ -0,0 +1,61 @@ +// blockchainUtils.js +const crypto = require('crypto'); +const EC = require('elliptic').ec; +const ec = new EC('secp256k1'); + +function generateBlockHash(block) { + return crypto.createHash('sha256') + .update(block.previousHash + JSON.stringify(block.transactions) + block.nonce + block.timestamp + block.index) + .digest('hex'); +} + +function publicKeyToAddress(publicKey) { + const sha256 = crypto.createHash('sha256').update(publicKey, 'hex').digest(); + const ripemd160 = crypto.createHash('ripemd160').update(sha256).digest('hex'); + return ripemd160; +} + +function createTransaction(publicKey, senderAddress, recipient, amount, privateKey) { + const key = ec.keyFromPrivate(privateKey, 'hex'); + + const transaction = { + publicKey, + senderAddress, + recipient, + amount, + timestamp: Date.now(), + }; + + const transactionData = publicKey + senderAddress + recipient + amount + transaction.timestamp; + const transactionHash = crypto.createHash('sha256').update(transactionData).digest('hex'); + const signature = key.sign(crypto.createHash('sha256').update(transactionData).digest()).toDER('hex'); + + transaction.hash = transactionHash; + transaction.signature = signature; + return transaction; +} + +function validateTransaction(transaction, balances) { + const { publicKey, senderAddress , recipient, amount, timestamp, signature } = transaction; + const key = ec.keyFromPublic(publicKey, 'hex'); + const isValid = key.verify(crypto.createHash('sha256').update(publicKey + senderAddress + recipient + amount + timestamp).digest(), signature); + + + if (balances[senderAddress] === undefined || balances[senderAddress] < amount) { + return false; + } + return isValid; +} + +function validateBlock(block, difficulty) { + const hash = generateBlockHash(block); + return hash.substring(0, difficulty) === '0'.repeat(difficulty); +} + +module.exports = { + generateBlockHash, + publicKeyToAddress, + createTransaction, + validateTransaction, + validateBlock, +}; diff --git a/centralServer.js b/centralServer.js new file mode 100644 index 0000000..8ba5b4b --- /dev/null +++ b/centralServer.js @@ -0,0 +1,342 @@ +// centralServer.js +const express = require("express"); +const WebSocket = require("ws"); +const fs = require("fs"); +const { + generateBlockHash, + publicKeyToAddress, + validateBlock, +} = require("./blockchainUtils"); +const EC = require("elliptic").ec; +const cors = require("cors"); + +const app = express(); +app.use(express.json()); +app.use(cors()); + +const ec = new EC("secp256k1"); +const wss = new WebSocket.Server({ port: 8080 }); +const Central_RPC_PORT = 8081; + +let blockchain = []; // Store blockchain in-memory +let miners = []; +let difficulty = 4; // Initial difficulty: requires hash to start with '0000' +const adjustmentInterval = 5; // Adjust difficulty every 5 blocks +let balances = {}; // Ledger to track account balances +const desiredBlockTime = 30000; // 30 seconds +let transactionPool = []; // Central server's transaction pool + +function createWallet() { + const keyPair = ec.genKeyPair(); + const privateKey = keyPair.getPrivate("hex"); + const publicKey = keyPair.getPublic("hex"); + const address = publicKeyToAddress(publicKey); + + return { publicKey, privateKey, address }; +} + +async function initializeBlockchain() { + const wallets = []; + const initialBalance = 10000000; + + for (let i = 0; i < 4; i++) { + const wallet = createWallet(); + balances[wallet.address] = initialBalance; + + wallets.push({ + publicKey: wallet.publicKey, + privateKey: wallet.privateKey, + address: wallet.address, + balance: initialBalance, + }); + } + + console.log("Balances:", balances); + + fs.writeFileSync("fund-wallets.txt", JSON.stringify(wallets, null, 2)); + + const genesisTimestamp = Date.now(); + const genesisBlock = { + index: 0, + previousHash: "0".repeat(64), + timestamp: genesisTimestamp, + transactions: [], + nonce: 0, + hash: generateBlockHash({ + index: 0, + previousHash: "0".repeat(64), + timestamp: genesisTimestamp, + transactions: [], + nonce: 0, + }), + }; + + blockchain.push(genesisBlock); +} + +wss.on("connection", (ws) => { + miners.push(ws); + console.log("New miner connected"); + + if (blockchain.length === 0) { + initializeBlockchain(); + console.log("Blockchain initialized"); + } + + ws.on("message", (message) => { + const data = JSON.parse(message); + + if (data.type === "request_blockchain") { + ws.send( + JSON.stringify({ type: "blockchain", blockchain, difficulty, balances }) + ); + } else if (data.type === "block") { + if (validateAndAddBlock(data.block)) { + console.log("Block mined and accepted, broadcasting to other miners"); + + // Notify the miner that its block was accepted + ws.send(JSON.stringify({ type: "block_accepted", block: data.block })); + + // Broadcast the accepted block to all other miners + miners.forEach((miner) => { + miner.send( + JSON.stringify({ + type: "block", + block: data.block, + difficulty, + balances, + }) + ); + }); + + if (blockchain.length % adjustmentInterval === 0) { + adjustDifficulty(); + } + } else { + console.log("Block rejected due to validation failure"); + + // Notify the miner that its block was rejected + ws.send(JSON.stringify({ type: "block_rejected", block: data.block })); + } + } else if (data.type === "transaction") { + miners.forEach((miner) => { + if (miner !== ws) { + miner.send( + JSON.stringify({ + type: "transaction", + transaction: data.transaction, + }) + ); + } + }); + console.log("Transaction broadcasted to all miners"); + } + }); + + ws.on("close", () => { + miners = miners.filter((miner) => miner !== ws); + console.log("Miner disconnected"); + }); +}); + +function validateAndAddBlock(newBlock) { + const lastBlock = blockchain[blockchain.length - 1]; + console.log("Validating new block:", newBlock); + + if (lastBlock) { + console.log("Last block:", lastBlock); + } + + if ( + lastBlock && + lastBlock.hash === newBlock.previousHash && + newBlock.index === lastBlock.index + 1 && + validateBlock(newBlock, difficulty) + ) { + blockchain.push(newBlock); + updateBalances(newBlock.transactions); + console.log("Block added to blockchain:", newBlock); + + // Remove transactions included in the new block from the transaction pool + removeMinedTransactions(newBlock.transactions); + + // Broadcast the updated transaction pool to all miners + broadcastTransactionPool(); + + return true; + } else if (!lastBlock && newBlock.index === 0) { + blockchain.push(newBlock); + updateBalances(newBlock.transactions); + console.log("Genesis block added to blockchain:", newBlock); + return true; + } else { + console.error("Block validation failed"); + if (lastBlock.hash !== newBlock.previousHash) { + console.error("Previous hash mismatch"); + } + if (newBlock.index !== lastBlock.index + 1) { + console.error("Index mismatch"); + } + if (!validateBlock(newBlock, difficulty)) { + console.error("Block does not satisfy the difficulty requirement"); + } + } + return false; +} + +function removeMinedTransactions(minedTransactions) { + transactionPool = transactionPool.filter((tx) => { + return !minedTransactions.some((minedTx) => minedTx.hash === tx.hash); + }); + console.log("Updated transaction pool after mining:", transactionPool); +} + +function broadcastTransactionPool() { + miners.forEach((miner) => { + miner.send(JSON.stringify({ type: "transactionPool", transactionPool })); + }); + console.log("Broadcasted updated transaction pool to all miners"); +} + +function adjustDifficulty() { + const blocksToConsider = blockchain.slice(-adjustmentInterval); + + const totalBlockTime = blocksToConsider.reduce((total, block, index) => { + if (index > 0) { + return total + (block.timestamp - blocksToConsider[index - 1].timestamp); + } + return total; + }, 0); + + const averageBlockTime = totalBlockTime / (blocksToConsider.length - 1); + + if (averageBlockTime < desiredBlockTime) { + // 30 seconds in milliseconds + difficulty++; + console.log("Difficulty increased to:", difficulty); + } else if (averageBlockTime > desiredBlockTime && difficulty > 1) { + difficulty--; + console.log("Difficulty decreased to:", difficulty); + } +} + +function updateBalances(transactions) { + transactions.forEach((tx) => { + const { publicKey, recipient, amount } = tx; + + const sender = publicKeyToAddress(publicKey); + if (sender === undefined) { + console.log("Invalid sender address"); + return; + } + if (balances[sender] !== undefined) { + balances[sender] -= amount; + } else { + balances[sender] = -amount; + } + + if (balances[recipient] !== undefined) { + balances[recipient] += amount; + } else { + balances[recipient] = amount; + } + }); + + console.log("Updated balances:", balances); +} + +//RPC ENDPOINTS + +// Return the entire blockchain history +app.get("/getBlockchainStats", (req, res) => { + res.json({ blockchain, difficulty }); +}); + +// Get Block by Index +app.get("/getBlock/:index", (req, res) => { + const { index } = req.params; + const block = blockchain.find((b) => b.index == index); + if (!block) { + return res.status(404).json({ error: "Block not found" }); + } + res.json(block); +}); + +// Get Latest Block +app.get("/getLatestBlock", (req, res) => { + const latestBlock = blockchain[blockchain.length - 1]; + res.json(latestBlock); +}); + +// Get Transaction by Hash +app.get("/getTransaction/:hash", (req, res) => { + const { hash } = req.params; + let transaction = null; + + blockchain.forEach((block) => { + block.transactions.forEach((tx) => { + if (tx.hash === hash) { + transaction = tx; + } + }); + }); + + if (!transaction) { + return res.status(404).json({ error: "Transaction not found" }); + } + + res.json(transaction); +}); + +// Get Transaction History for a Specific Address +app.get("/getTransactionHistory/:address", (req, res) => { + const { address } = req.params; + let transactionHistory = []; + + blockchain.forEach((block) => { + block.transactions.forEach((tx) => { + if (tx.senderAddress === address || tx.recipient === address) { + transactionHistory.push({ + ...tx, + status: "confirmed", + blockIndex: block.index, + timestamp: block.timestamp, + }); + } + }); + }); + res.json({"Transactions": transactionHistory}); +}); + +// Get Transaction Count for a Specific Address +app.get("/getTransactionCount/:address", (req, res) => { + const { address } = req.params; + let transactionCount = 0; + + blockchain.forEach((block) => { + block.transactions.forEach((tx) => { + if (tx.senderAddress === address || tx.recipient === address) { + transactionCount++; + } + }); + }); + + const pendingTransactions = transactionPool.filter( + (tx) => tx.senderAddress === address || tx.recipient === address + ); + transactionCount += pendingTransactions.length; + + res.json({ address, transactionCount }); +}); + +//Return Difficulty +app.get("/getDifficulty", (req, res) => { + res.json({ "Current Difficulty": difficulty }); +}); + +app.listen(Central_RPC_PORT, () => { + console.log( + `Central Server RPC server running on http://localhost:${Central_RPC_PORT}` + ); +}); +console.log("Central server running on ws://localhost:8080"); diff --git a/minerServer.js b/minerServer.js new file mode 100644 index 0000000..d445fa7 --- /dev/null +++ b/minerServer.js @@ -0,0 +1,348 @@ +// minerServer.js +const WebSocket = require("ws"); +const express = require("express"); +const { + generateBlockHash, + publicKeyToAddress, + createTransaction, + validateTransaction, + validateBlock, +} = require("./blockchainUtils"); +const EC = require("elliptic").ec; +const net = require("net"); + +const app = express(); +app.use(express.json()); +let PORT = 3000; + +const ec = new EC("secp256k1"); + +let miningInterval = null; // Store the mining interval +let resyncTimeout = null; // Timeout for resync after block rejection + +const resyncThreshold = 4; // Number of seconds to wait before resyncing +const miningIntervalTime = 30000; // Time in milliseconds between mining blocks + +// If 3000 already in use, try 3001 or 3002 +function checkPortInUse(PORT, callback) { + const server = net.createServer(); + server.once("error", function (err) { + if (err.code === "EADDRINUSE") { + console.log(`Port ${PORT} is in use, trying another port`); + PORT++; + checkPortInUse(PORT, callback); + } else { + callback(err); + } + }); + + server.once("listening", function () { + server.close(); + callback(null, PORT); + }); + + server.listen(PORT); +} + +checkPortInUse(PORT, (err, availablePort) => { + if (err) { + console.error("Error checking port:", err); + } else { + PORT = availablePort; + console.log("Launching server on port", PORT); + launchServer(); + } +}); + +function launchServer() { + + const ws = new WebSocket("ws://localhost:8080"); + + let blockchain = []; // Store blockchain in-memory + let transactionPool = []; // Local pool for unconfirmed transactions + let difficulty; // Difficulty will be updated by the central server + let balances = {}; // Ledger to track account balances + + app.post("/sendTransaction", (req, res) => { + const { recipient, amount, privateKey } = req.body; + if (amount <= 0) { + return res.status(400).send("Amount must be greater than 0"); + } + if (recipient.length !== 40) { + return res.status(400).send("Invalid recipient address"); + } + if (privateKey.length !== 64) { + return res.status(400).send("Invalid private key"); + } + sendTransaction(recipient, amount, privateKey); + res.send("Transaction processed"); + }); + + // Expose getBalances via an Express API + app.get("/getBalances", (req, res) => { + res.send(balances); + }); + + console.log("Sending balances response:", balances); + // Expose getBlockHeight via an Express API + app.get("/getBlockHeight", (req, res) => { + res.send({ blockHeight: blockchain.length }); + }); + + // Expose getBalance of a specific address via an Express API + app.get("/getBalance/:address", (req, res) => { + const { address } = req.params; + res.send({ balance: balances[address] || 0 }); + }); + + // Get Mining Info + app.get("/miningInfo", (req, res) => { + res.json({ + mining: miningInterval !== null, + difficulty, + blockHeight: blockchain.length, + }); + }); + + // Get Pending Transactions + app.get("/pendingTransactions", (req, res) => { + res.json({ transactionPool }); + }); + + // Get Pending Transactions by Sender Address + app.get("/getPendingTransactionsByAccount/:address", (req, res) => { + const { address } = req.params; + + const pendingTransactions = transactionPool.filter((tx) => { + const senderAddress = publicKeyToAddress(tx.publicKey); + + return ( + senderAddress === address|| tx.recipient === address + ); + }); + + if (pendingTransactions.length === 0) { + return res + .status(404) + .json({ error: "No pending transactions found for this address" }); + } + + res.json({ pendingTransactions }); + }); + + app.listen(PORT, () => { + console.log(`Server running on port ${PORT}`); + }); + + + ws.on("open", () => { + console.log("Connected to central server"); + // Request the current blockchain and balances from the central server + ws.send(JSON.stringify({ type: "request_blockchain" })); + }); + + ws.on("message", (message) => { + const data = JSON.parse(message); + + if (data.type === "block_accepted") { + console.log("Block accepted:", data.block); + clearTimeout(resyncTimeout); // Clear resync timeout + blockchain.push(data.block); + updateLocalBalances(data.block.transactions); + // Start mining the next block + miningInterval = setTimeout(mineBlock, miningIntervalTime); // Adjust the interval as needed + } else if (data.type === "block_rejected") { + console.log("Block rejected:", data.block); + console.log("Waiting for the correct block from the central server..."); + + resyncTimeout = setTimeout(() => { + console.log( + "No new block received. Resyncing with the central server..." + ); + ws.send(JSON.stringify({ type: "request_blockchain" })); + }, resyncThreshold * 1000); + } else if (data.type === "block") { + console.log( + "New block received, stopping current mining and updating blockchain." + ); + clearInterval(miningInterval); // Stop current mining + clearTimeout(resyncTimeout); // Clear resync timeout + handleReceivedBlock(data.block); + difficulty = data.difficulty; // Update difficulty + balances = data.balances; // Update balances + } else if (data.type === "blockchain") { + console.log("Blockchain received from central server. Validating..."); + validateReceivedBlockchain( + data.blockchain, + data.difficulty, + data.balances + ); + } else if (data.type === "transaction") { + console.log("Received transaction from central server, adding to pool"); + transactionPool.push(data.transaction); + } else if (data.type === "transactionPool") { + console.log("Received updated transaction pool from central server"); + transactionPool = data.transactionPool; + } + }); + + function validateReceivedBlockchain( + receivedBlockchain, + receivedDifficulty, + receivedBalances + ) { + const localLastBlock = blockchain[blockchain.length - 1]; + const receivedLastBlock = receivedBlockchain[receivedBlockchain.length - 1]; + + // Accept the received blockchain if it's longer or if the heights are equal and hashes match + if ( + receivedBlockchain.length > blockchain.length || + (receivedBlockchain.length === blockchain.length && + receivedLastBlock.hash === localLastBlock.hash) + ) { + console.log("Received blockchain is valid. Updating local blockchain."); + blockchain = receivedBlockchain; + difficulty = receivedDifficulty; + balances = receivedBalances; + clearTimeout(resyncTimeout); // Clear resync timeout + miningInterval = setTimeout(mineBlock, miningIntervalTime); // Start mining again + } else { + console.log( + "Received blockchain is shorter and hashes do not match. Ignoring..." + ); + } + } + + function mineBlock() { + const previousBlock = blockchain[blockchain.length - 1]; + const previousHash = previousBlock ? previousBlock.hash : ""; + let nonce = 0; + let hash; + const index = blockchain.length; + const timestamp = Date.now(); + + const validTransactions = + transactionPool.filter((tx) => validateTransaction(tx, balances)) || []; + + do { + nonce++; + hash = generateBlockHash({ + index, + timestamp, + transactions: validTransactions, + nonce, + previousHash, + }); + } while (hash.substring(0, difficulty) !== "0".repeat(difficulty)); + + const block = { + index, + timestamp, + transactions: validTransactions, + nonce, + hash, + previousHash, + }; + + console.log(`Block mined: ${JSON.stringify(block)}`); + + // Send the newly mined block to the central server + ws.send(JSON.stringify({ type: "block", block })); + console.log("Block sent to central server, waiting for confirmation"); + } + + function handleReceivedBlock(newBlock) { + const lastBlock = blockchain[blockchain.length - 1]; + + console.log("Received block:", newBlock); + console.log("Current last block:", lastBlock); + + if ( + lastBlock && + lastBlock.hash === newBlock.previousHash && + newBlock.index === lastBlock.index + 1 + ) { + blockchain.push(newBlock); + updateLocalBalances(newBlock.transactions); + console.log("New block added to the chain:", newBlock); + + // Remove transactions from transaction pool that are in the new block + transactionPool = transactionPool.filter( + (tx) => !newBlock.transactions.includes(tx) + ); + + console.log( + "Updated transaction pool after block acceptance:", + transactionPool + ); + + // Start mining the next block + miningInterval = setTimeout(mineBlock, miningIntervalTime); // Adjust the interval as needed + } else { + console.log("Invalid block rejected"); + } + } + + function updateLocalBalances(transactions) { + transactions.forEach(tx => { + const { publicKey, recipient, amount } = tx; + + const sender = publicKeyToAddress(publicKey); + if (sender === undefined) { + console.log('Invalid sender address'); + return; + } + + if (balances[sender] !== undefined) { + balances[sender] -= amount; + } + + if (balances[recipient] !== undefined) { + balances[recipient] += amount; + } else { + balances[recipient] = amount; + } + }); + + console.log('Updated local balances:', balances); +} + + function handleTransaction(transaction) { + if (validateTransaction(transaction, balances)) { + transactionPool.push(transaction); + console.log( + "Transaction added to local pool and broadcasting to central server" + ); + + // Broadcast the valid transaction to the central server + ws.send(JSON.stringify({ type: "transaction", transaction })); + } else { + console.log("Invalid transaction rejected"); + } + } + + function sendTransaction(recipient, amount, privateKey) { + const key = ec.keyFromPrivate(privateKey, "hex"); + const publicKey = key.getPublic().encode("hex"); + const senderAddress = publicKeyToAddress(publicKey); + + if ( + balances[senderAddress] === undefined || + balances[senderAddress] < amount + ) { + console.log("Insufficient balance to send the transaction"); + return; + } + + const transaction = createTransaction( + publicKey, + senderAddress, + recipient, + amount, + privateKey + ); + handleTransaction(transaction); + } + + setTimeout(mineBlock, miningIntervalTime); // Start mining a block after a delay +} diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..e6e5c9c --- /dev/null +++ b/package-lock.json @@ -0,0 +1,871 @@ +{ + "name": "request-for-code", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "dependencies": { + "cors": "^2.8.5", + "crypto": "^1.0.1", + "elliptic": "^6.5.7", + "express": "^4.19.2", + "ws": "^8.18.0" + } + }, + "node_modules/accepts": { + "version": "1.3.8", + "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz", + "integrity": 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