network_throughput.js

var bluebird     = require('bluebird');
var Promise      = bluebird.Promise;
var Remote       = require('ripple-lib').Remote;

function measureThroughput() {
  return new Promise(function(resolve, reject) {
    var remote = new Remote({
      servers: [ 'wss://s.altnet.rippletest.net:51233' ]
    })

    var remoteConnect = Promise.promisify(remote.connect, remote);

    remoteConnect().then(function() {
      console.log('connected!')
      var remoteRequest = Promise.promisify(remote.request, remote);
      return remoteRequest('server_info').then(function(res) {
        console.log(res)
        remote.on('ledger_closed', function(ledger) {
          // Ignore empty ledgers
          if (last_ledger && ledger.ledger_time-last_ledger.ledger_time<20) {
            console.log('ledger:', ledger.ledger_index);
            console.log('txs:', ledger.txn_count);
            console.log('time:', ledger.ledger_time-last_ledger.ledger_time);
            console.log('ledger_time:', ledger.ledger_time);
            console.log('Last ledger: %d txs/second', ledger.txn_count/(ledger.ledger_time-last_ledger.ledger_time));
            total_txs += ledger.txn_count;
            total_seconds += ledger.ledger_time-last_ledger.ledger_time;
            console.log('Total: %d txs/second', total_txs/total_seconds);
          }
          last_ledger = ledger;
        });

        resolve();
      });
    }).catch(function(err) {
      console.log(err);
    })
  });
}

last_ledger = null;
total_txs = 0;
total_seconds = 0;