BlueWallet/tests/integration/ElectrumClient.test.js

const bitcoin = require('bitcoinjs-lib');
global.net = require('net');
global.tls = require('tls');

const assert = require('assert');
jasmine.DEFAULT_TIMEOUT_INTERVAL = 150 * 1000;

const hardcodedPeers = [
  { host: 'electrum1.bluewallet.io', ssl: '443' },
  { host: 'electrum2.bluewallet.io', ssl: '443' },
  { host: 'electrum3.bluewallet.io', ssl: '443' },
  { host: 'electrum1.bluewallet.io', tcp: '50001' },
  { host: 'electrum2.bluewallet.io', tcp: '50001' },
  { host: 'electrum3.bluewallet.io', tcp: '50001' },
];

describe('ElectrumClient', () => {
  it('can connect and query', async () => {
    const ElectrumClient = require('electrum-client');

    for (const peer of hardcodedPeers) {
      const mainClient = new ElectrumClient(peer.ssl || peer.tcp, peer.host, peer.ssl ? 'tls' : 'tcp');

      try {
        await mainClient.connect();
        await mainClient.server_version('2.7.11', '1.4');
      } catch (e) {
        mainClient.reconnect = mainClient.keepAlive = () => {}; // dirty hack to make it stop reconnecting
        mainClient.close();
        throw new Error('bad connection: ' + JSON.stringify(peer) + ' ' + e.message);
      }

      let addr4elect = 'bc1qwqdg6squsna38e46795at95yu9atm8azzmyvckulcc7kytlcckxswvvzej';
      let script = bitcoin.address.toOutputScript(addr4elect);
      let hash = bitcoin.crypto.sha256(script);
      let reversedHash = Buffer.from(hash.reverse());
      const start = +new Date();
      let balance = await mainClient.blockchainScripthash_getBalance(reversedHash.toString('hex'));
      const end = +new Date();
      end - start > 1000 && console.warn(peer.host, 'took', (end - start) / 1000, 'seconds to fetch balance');
      assert.ok(balance.confirmed > 0);

      addr4elect = '3GCvDBAktgQQtsbN6x5DYiQCMmgZ9Yk8BK';
      script = bitcoin.address.toOutputScript(addr4elect);
      hash = bitcoin.crypto.sha256(script);
      reversedHash = Buffer.from(hash.reverse());
      balance = await mainClient.blockchainScripthash_getBalance(reversedHash.toString('hex'));

      // let peers = await mainClient.serverPeers_subscribe();
      // console.log(peers);
      mainClient.close();
    }
  });
});