Global Network Performance Testing

async function globalPerformanceTest(target) {
  const headers = { 'Authorization': 'Bearer YOUR_API_KEY' };

  const [ping, traceroute, responseTime, cdn] = await Promise.all([
    fetch(`https://api.edgedns.dev/v1/network/ping?host=${target}`, { headers }),
    fetch(`https://api.edgedns.dev/v1/network/traceroute?host=${target}`, { headers }),
    fetch(`https://api.edgedns.dev/v1/domain/response-time?domain=${target}`, { headers }),
    fetch(`https://api.edgedns.dev/v1/domain/cdn?domain=${target}`, { headers }),
  ].map(p => p.then(r => r.json())));

  // Analyze regional latency — use p95 as the primary SLA metric, not average.
  // The average smooths over the slow 5% of packets; p95 is what your SLA is written against.
  const regions = ping.data.results;
  const perRegion = regions.map(r => ({
    region: r.probe_zone,
    avgMs: r.latency_ms,
    p95Ms: r.p95_ms,
    p99Ms: r.p99_ms,
    jitterMs: r.interarrival_jitter_ms,
    packetLossPct: r.icmp_stats?.packet_loss_pct ?? 0
  }));

  // Flag any zone where p95 is more than 2x the global p95, OR loss > 5%, OR jitter > 30ms
  const globalP95 = ping.data.p95_ms ?? 0;
  const outliers = perRegion.filter(r =>
    (r.p95Ms && r.p95Ms > globalP95 * 2) || r.packetLossPct > 5 || (r.jitterMs ?? 0) > 30
  );

  // Build a per-zone summary of the AS path — useful for spotting transit-provider differences
  // that explain a regional latency cliff (e.g. one region routes via Cogent, another via NTT).
  const asPaths = traceroute.data.results.map(r => ({
    region: r.probe_zone,
    asPath: r.as_path,
    reachedDestination: r.reached_destination
  }));

  return {
    target,
    cdn: cdn.data.provider,
    globalP95Latency: globalP95 + 'ms',
    globalP99Latency: ping.data.p99_ms + 'ms',
    httpResponseTime: responseTime.data.total_ms + 'ms',
    regionCount: regions.length,
    bestRegion: perRegion.sort((a, b) => (a.p95Ms ?? Infinity) - (b.p95Ms ?? Infinity))[0],
    worstRegion: perRegion.sort((a, b) => (b.p95Ms ?? 0) - (a.p95Ms ?? 0))[0],
    outliers,
    asPaths,
    hasIssues: outliers.length > 0
  };
}