Function print_statistics

scripts/osrm-runner.js:184–237

(results)

// Calculate and print query statistics
function print_statistics(results) {
  const total_queries = results.length;
  const successful = results.filter(r => r.code === 200 && r.total > 0);
  const successful_count = successful.length;
  const failed_count = total_queries - successful_count;

  process.stderr.write('\n=== Query Statistics ===\n');
  process.stderr.write(`Total queries: ${total_queries}\n`);
  process.stderr.write(`Successful: ${successful_count}\n`);
  process.stderr.write(`Failed: ${failed_count}\n`);

  if (successful_count === 0) {
    // Show sample of error codes to help debug
    const error_codes = {};
    results.forEach(r => {
      error_codes[r.code] = (error_codes[r.code] || 0) + 1;
    });
    process.stderr.write('\nError breakdown:\n');
    Object.entries(error_codes).forEach(([code, count]) => {
      process.stderr.write(`  ${code}: ${count} queries\n`);
    });
    process.stderr.write('========================\n\n');
    return;
  }

  // Extract total times from successful queries (filter out any 0 or invalid times)
  const times = successful.map(r => r.total).filter(t => t > 0).sort((a, b) => a - b);

  if (times.length === 0) {
    process.stderr.write('No valid response times recorded\n');
    process.stderr.write('========================\n\n');
    return;
  }

  const min = times[0];
  const max = times[times.length - 1];
  const avg = times.reduce((sum, t) => sum + t, 0) / times.length;

  // Calculate median
  let median;
  const mid = Math.floor(times.length / 2);
  if (times.length % 2 === 0) {
    median = (times[mid - 1] + times[mid]) / 2;
  } else {
    median = times[mid];
  }

  process.stderr.write(`\nResponse times (ms):\n`);
  process.stderr.write(`  Min:    ${min.toFixed(2)}\n`);
  process.stderr.write(`  Max:    ${max.toFixed(2)}\n`);
  process.stderr.write(`  Avg:    ${avg.toFixed(2)}\n`);
  process.stderr.write(`  Median: ${median.toFixed(2)}\n`);
  process.stderr.write('========================\n\n');
}