netwatch/src/main.js
sneak 94169b8d65 Add S3, GCS, and B2 regional storage endpoints
Remove DigitalOcean. Add B2, 7 S3 endpoints across all continents
(Cape Town, London, Bahrain, Tokyo, Sydney, Oregon, São Paulo), and
4 GCS locational endpoints (Iowa, Belgium, Singapore, Sydney) for
cross-provider latency comparison.
2026-02-23 00:35:07 +07:00

677 lines
24 KiB
JavaScript

import "./styles.css";
// --- Configuration -----------------------------------------------------------
// Timing, axis labels, and display constants. Latency above maxLatency is
// clamped to "unreachable". The sparkline Y-axis is capped at
// graphMaxLatency — values above it pin to the top of the chart but still
// display their real value in the latency figure. The history buffer holds
// maxHistoryPoints samples (historyDuration / updateInterval).
const CONFIG = Object.freeze({
updateInterval: 2000,
historyDuration: 300,
requestTimeout: 1500,
maxLatency: 1500,
graphMaxLatency: 1000,
yAxisTicks: [0, 250, 500, 750, 1000],
xAxisTicks: [0, 60, 120, 180, 240, 300],
canvasHeight: 80,
get maxHistoryPoints() {
return Math.ceil((this.historyDuration * 1000) / this.updateInterval);
},
});
// WAN endpoints to monitor. These are used for the aggregate health/stats
// display (min/max/avg). Ordered: personal, LLM APIs, big-3 cloud, then
// CDN/hosting/other.
const WAN_HOSTS = [
{ name: "datavi.be", url: "https://datavi.be" },
{ name: "Anthropic API", url: "https://api.anthropic.com" },
{ name: "OpenAI API", url: "https://api.openai.com" },
{ name: "AWS Console", url: "https://console.aws.amazon.com" },
{ name: "Google Cloud Console", url: "https://console.cloud.google.com" },
{ name: "Microsoft Azure", url: "https://portal.azure.com" },
{ name: "Cloudflare", url: "https://www.cloudflare.com" },
{ name: "Fastly CDN", url: "https://www.fastly.com" },
{ name: "Akamai", url: "https://www.akamai.com" },
{ name: "GitHub", url: "https://github.com" },
{ name: "B2", url: "https://api.backblazeb2.com" },
{
name: "S3 af-south-1 Cape Town (Africa)",
url: "https://s3.af-south-1.amazonaws.com",
},
{
name: "S3 eu-west-2 London (Europe)",
url: "https://s3.eu-west-2.amazonaws.com",
},
{
name: "S3 me-south-1 Bahrain (Middle East)",
url: "https://s3.me-south-1.amazonaws.com",
},
{
name: "S3 ap-northeast-1 Tokyo (Asia)",
url: "https://s3.ap-northeast-1.amazonaws.com",
},
{
name: "S3 ap-southeast-2 Sydney (Oceania)",
url: "https://s3.ap-southeast-2.amazonaws.com",
},
{
name: "S3 us-west-2 Oregon (North America)",
url: "https://s3.us-west-2.amazonaws.com",
},
{
name: "S3 sa-east-1 São Paulo (South America)",
url: "https://s3.sa-east-1.amazonaws.com",
},
// GCS locational endpoints — compare GCP routing vs AWS per-continent
{
name: "GCS us-central1 Iowa (North America)",
url: "https://storage.us-central1.rep.googleapis.com",
},
{
name: "GCS europe-west1 Belgium (Europe)",
url: "https://storage.europe-west1.rep.googleapis.com",
},
{
name: "GCS asia-southeast1 Singapore (Asia)",
url: "https://storage.asia-southeast1.rep.googleapis.com",
},
{
name: "GCS australia-southeast1 Sydney (Oceania)",
url: "https://storage.australia-southeast1.rep.googleapis.com",
},
];
// The cable modem / CPE upstream of the local gateway — always monitored.
const LOCAL_CPE = { name: "Local CPE", url: "http://192.168.100.1" };
// Common default gateway addresses. On startup we probe each one and use
// whichever responds first as the "Local Gateway" monitor target.
//
// NOTE: Modern browsers enforce Private Network Access (PNA) restrictions
// that block pages served from public origins from making requests to
// RFC1918 addresses. These local targets will likely only work when
// NetWatch is served from localhost or another private address.
const GATEWAY_CANDIDATES = [
"http://192.168.1.1",
"http://192.168.0.1",
"http://192.168.8.1",
"http://10.0.0.1",
];
// --- Gateway Detection -------------------------------------------------------
// Probe each gateway candidate with a short timeout. Returns the first one
// that responds, or null if none do. We race them all in parallel and take
// whichever wins.
async function detectGateway() {
try {
const result = await Promise.any(
GATEWAY_CANDIDATES.map(async (url) => {
const controller = new AbortController();
const timeoutId = setTimeout(() => controller.abort(), 1500);
try {
await fetch(url, {
method: "HEAD",
mode: "no-cors",
cache: "no-store",
signal: controller.signal,
});
clearTimeout(timeoutId);
return { name: "Local Gateway", url };
} catch {
clearTimeout(timeoutId);
throw new Error("no response");
}
}),
);
return result;
} catch {
// All candidates failed
return null;
}
}
// --- App State ---------------------------------------------------------------
class HostState {
constructor(host) {
this.name = host.name;
this.url = host.url;
this.history = []; // { timestamp, latency, paused }
this.lastLatency = null;
this.status = "pending"; // 'online' | 'offline' | 'error' | 'pending'
}
pushSample(timestamp, result) {
this.history.push({
timestamp,
latency: result.latency,
error: result.error,
});
this._trim();
this.lastLatency = result.latency;
if (result.error === "timeout") this.status = "error";
else if (result.error) this.status = "offline";
else this.status = "online";
}
pushPaused(timestamp) {
this.history.push({ timestamp, latency: null, paused: true });
this._trim();
}
averageLatency() {
const valid = this.history.filter((p) => p.latency !== null);
if (valid.length === 0) return null;
return Math.round(
valid.reduce((s, p) => s + p.latency, 0) / valid.length,
);
}
_trim() {
while (this.history.length > CONFIG.maxHistoryPoints)
this.history.shift();
}
}
class AppState {
constructor(localHosts) {
this.wan = WAN_HOSTS.map((h) => new HostState(h));
this.local = localHosts.map((h) => new HostState(h));
this.paused = false;
}
get allHosts() {
return [...this.wan, ...this.local];
}
/** WAN-only stats from latest sample (excludes local) */
wanStats() {
const reachable = this.wan.filter((h) => h.lastLatency !== null);
const latencies = reachable.map((h) => h.lastLatency);
const total = this.wan.length;
if (latencies.length === 0)
return { reachable: 0, total, min: null, max: null, avg: null };
return {
reachable: latencies.length,
total,
min: Math.min(...latencies),
max: Math.max(...latencies),
avg: Math.round(
latencies.reduce((a, b) => a + b, 0) / latencies.length,
),
};
}
/** Overall health: true = healthy (more than half WAN reachable) */
isHealthy() {
const reachable = this.wan.filter((h) => h.lastLatency !== null).length;
return reachable > this.wan.length / 2;
}
}
// --- Latency Measurement -----------------------------------------------------
async function measureLatency(url) {
const controller = new AbortController();
const timeoutId = setTimeout(
() => controller.abort(),
CONFIG.requestTimeout,
);
const targetUrl = new URL(url);
targetUrl.searchParams.set("_cb", Date.now().toString());
const start = performance.now();
try {
await fetch(targetUrl.toString(), {
method: "HEAD",
mode: "no-cors",
cache: "no-store",
signal: controller.signal,
});
const latency = Math.round(performance.now() - start);
clearTimeout(timeoutId);
if (latency > CONFIG.maxLatency)
return { latency: null, error: "timeout" };
return { latency, error: null };
} catch (err) {
clearTimeout(timeoutId);
if (err.name === "AbortError")
return { latency: null, error: "timeout" };
return { latency: null, error: "unreachable" };
}
}
// --- Color Helpers -----------------------------------------------------------
function latencyHex(latency) {
if (latency === null) return "#6b7280";
if (latency < 50) return "#22c55e";
if (latency < 100) return "#84cc16";
if (latency < 200) return "#eab308";
if (latency < 500) return "#f97316";
return "#ef4444";
}
function latencyClass(latency, status) {
if (status === "offline" || status === "error" || latency === null)
return "text-gray-500";
if (latency < 50) return "text-green-500";
if (latency < 100) return "text-lime-500";
if (latency < 200) return "text-yellow-500";
if (latency < 500) return "text-orange-500";
return "text-red-500";
}
// --- Sparkline Renderer ------------------------------------------------------
class SparklineRenderer {
static MARGIN = { left: 35, right: 10, top: 5, bottom: 18 };
static draw(canvas, history) {
const ctx = canvas.getContext("2d");
const dpr = window.devicePixelRatio || 1;
const w = canvas.width / dpr;
const h = canvas.height / dpr;
const m = SparklineRenderer.MARGIN;
const cw = w - m.left - m.right;
const ch = h - m.top - m.bottom;
ctx.clearRect(0, 0, w, h);
SparklineRenderer._drawYAxis(ctx, w, h, m, ch);
SparklineRenderer._drawXAxis(ctx, w, h, m, cw);
const len = history.length;
const pw = cw / (CONFIG.maxHistoryPoints - 1);
const getX = (i) => m.left + cw - (len - 1 - i) * pw;
const getY = (lat) =>
m.top +
ch -
(Math.min(lat, CONFIG.graphMaxLatency) / CONFIG.graphMaxLatency) *
ch;
SparklineRenderer._drawErrors(ctx, history, getX, m.top, ch);
SparklineRenderer._drawLine(ctx, history, getX, getY);
SparklineRenderer._drawTip(ctx, history, getX, getY);
}
static _drawYAxis(ctx, w, h, m, ch) {
ctx.font = "9px monospace";
ctx.textAlign = "right";
ctx.textBaseline = "middle";
for (const tick of CONFIG.yAxisTicks) {
const y = m.top + ch - (tick / CONFIG.graphMaxLatency) * ch;
ctx.strokeStyle = "rgba(255,255,255,0.1)";
ctx.lineWidth = 1;
ctx.beginPath();
ctx.moveTo(m.left, y);
ctx.lineTo(w - m.right, y);
ctx.stroke();
ctx.fillStyle = "rgba(255,255,255,0.5)";
ctx.fillText(`${tick}`, m.left - 4, y);
}
}
static _drawXAxis(ctx, w, h, m, cw) {
ctx.textAlign = "center";
ctx.textBaseline = "top";
for (const tick of CONFIG.xAxisTicks) {
const x = m.left + cw - (tick / CONFIG.historyDuration) * cw;
ctx.fillStyle = "rgba(255,255,255,0.5)";
ctx.fillText(`-${tick}s`, x, h - m.bottom + 4);
}
}
static _drawErrors(ctx, history, getX, top, ch) {
ctx.fillStyle = "rgba(239, 68, 68, 0.2)";
let inErr = false,
start = 0;
for (let i = 0; i < history.length; i++) {
const p = history[i];
const x = getX(i);
// Only real errors, not paused gaps
const isError = p.latency === null && !p.paused;
if (isError && !inErr) {
inErr = true;
start = x;
} else if (!isError && inErr) {
inErr = false;
ctx.fillRect(start, top, x - start, ch);
}
}
if (inErr)
ctx.fillRect(start, top, getX(history.length - 1) - start + 5, ch);
}
static _drawLine(ctx, history, getX, getY) {
ctx.lineWidth = 2;
ctx.lineCap = "round";
ctx.lineJoin = "round";
let prev = null;
for (let i = 0; i < history.length; i++) {
const p = history[i];
if (p.latency === null) {
prev = null;
continue;
}
const x = getX(i),
y = getY(p.latency);
if (prev) {
ctx.strokeStyle = latencyHex(p.latency);
ctx.beginPath();
ctx.moveTo(prev.x, prev.y);
ctx.lineTo(x, y);
ctx.stroke();
}
prev = { x, y };
}
}
static _drawTip(ctx, history, getX, getY) {
for (let i = history.length - 1; i >= 0; i--) {
if (history[i].latency !== null) {
const x = getX(i),
y = getY(history[i].latency);
ctx.fillStyle = latencyHex(history[i].latency);
ctx.beginPath();
ctx.arc(x, y, 3, 0, Math.PI * 2);
ctx.fill();
return;
}
}
}
static sizeCanvas(canvas) {
const dpr = window.devicePixelRatio || 1;
const rect = canvas.getBoundingClientRect();
canvas.width = rect.width * dpr;
canvas.height = CONFIG.canvasHeight * dpr;
const ctx = canvas.getContext("2d");
ctx.setTransform(1, 0, 0, 1, 0, 0);
ctx.scale(dpr, dpr);
}
}
// --- UI Renderer -------------------------------------------------------------
function hostRowHTML(host, index) {
return `
<div class="host-row bg-gray-800/50 rounded-lg p-4 border border-gray-700/50" data-index="${index}">
<div class="flex items-center gap-4">
<div class="w-48 flex-shrink-0">
<div class="flex items-center gap-2">
<div class="w-3 h-3 rounded-full" style="background-color: ${latencyHex(null)}"></div>
<span class="font-medium text-white truncate">${host.name}</span>
</div>
<a href="${host.url}" target="_blank" rel="noopener" class="text-xs text-gray-500 mt-1 truncate block">${host.url}</a>
</div>
<div class="w-32 flex-shrink-0 text-right">
<div class="latency-value text-4xl font-bold tabular-nums" data-host="${index}">
<span class="text-gray-500">---</span>
</div>
<div class="status-text text-xs text-gray-500 mt-1" data-host="${index}">waiting...</div>
</div>
<div class="flex-grow sparkline-container rounded overflow-hidden border border-gray-700/30">
<canvas class="sparkline-canvas w-full" data-host="${index}" height="${CONFIG.canvasHeight}"></canvas>
</div>
</div>
</div>`;
}
function buildUI(state) {
const app = document.getElementById("app");
app.innerHTML = `
<div class="max-w-7xl mx-auto px-4 py-8">
<header class="mb-8">
<div class="flex items-center justify-between mb-4">
<h1 class="text-3xl font-bold text-white">NetWatch</h1>
<button id="pause-btn"
class="flex items-center gap-3 px-6 py-3 bg-gray-800 hover:bg-gray-700 border border-gray-600 rounded-lg transition-colors focus:outline-none focus:ring-2 focus:ring-blue-500">
<svg id="pause-icon" class="w-8 h-8 text-yellow-400" fill="currentColor" viewBox="0 0 24 24">
<rect x="6" y="4" width="4" height="16" rx="1"/><rect x="14" y="4" width="4" height="16" rx="1"/>
</svg>
<svg id="play-icon" class="w-8 h-8 text-green-400 hidden" fill="currentColor" viewBox="0 0 24 24">
<path d="M8 5v14l11-7z"/>
</svg>
<span id="pause-text" class="text-lg font-semibold text-white">Pause</span>
</button>
</div>
<p class="text-gray-400 text-sm">
Real-time network latency monitor |
<span class="text-gray-500">Updates every ${CONFIG.updateInterval / 1000}s</span> |
<span class="text-gray-500">History: ${CONFIG.historyDuration}s</span> |
<span id="status-indicator" class="text-green-400">Running</span>
</p>
<div id="health-box" class="mt-4 p-3 bg-gray-800/70 rounded-lg border border-gray-700/50 font-mono text-sm text-center">
<span id="health-text" class="text-gray-400">Waiting for data...</span>
</div>
<div id="summary" class="mt-2 p-3 bg-gray-800/70 rounded-lg border border-gray-700/50 font-mono text-sm">
<span class="text-gray-400">Reachable:</span> <span id="summary-reachable" class="text-white">--/--</span>
<span class="text-gray-600 mx-3">|</span>
<span class="text-gray-400">Min:</span> <span id="summary-min" class="text-green-400">--ms</span>
<span class="text-gray-600 mx-3">|</span>
<span class="text-gray-400">Max:</span> <span id="summary-max" class="text-red-400">--ms</span>
<span class="text-gray-600 mx-3">|</span>
<span class="text-gray-400">Avg:</span> <span id="summary-avg" class="text-yellow-400">--ms</span>
</div>
</header>
<div id="wan-hosts" class="space-y-4">
${state.wan.map((h, i) => hostRowHTML(h, i)).join("")}
</div>
<h2 class="text-gray-500 text-xs uppercase tracking-wide mt-6 mb-3">Local Network</h2>
<div id="local-hosts" class="space-y-4">
${state.local.map((h, i) => hostRowHTML(h, state.wan.length + i)).join("")}
</div>
<footer class="mt-8 text-center text-gray-600 text-xs">
<p>Latency measured via HEAD requests | IPv4 only | CORS restrictions may affect some measurements</p>
<p class="mt-2">
<span class="inline-block w-3 h-3 rounded-full bg-green-500 mr-1 align-middle"></span>&lt;50ms
<span class="inline-block w-3 h-3 rounded-full bg-lime-500 mr-1 ml-3 align-middle"></span>&lt;100ms
<span class="inline-block w-3 h-3 rounded-full bg-yellow-500 mr-1 ml-3 align-middle"></span>&lt;200ms
<span class="inline-block w-3 h-3 rounded-full bg-orange-500 mr-1 ml-3 align-middle"></span>&lt;500ms
<span class="inline-block w-3 h-3 rounded-full bg-red-500 mr-1 ml-3 align-middle"></span>&gt;500ms
<span class="inline-block w-3 h-3 rounded-full bg-gray-500 mr-1 ml-3 align-middle"></span>offline
</p>
</footer>
</div>`;
requestAnimationFrame(() => {
document
.querySelectorAll(".sparkline-canvas")
.forEach((c) => SparklineRenderer.sizeCanvas(c));
});
}
// --- UI Updaters -------------------------------------------------------------
function updateHostRow(host, index) {
const latencyEl = document.querySelector(
`.latency-value[data-host="${index}"]`,
);
const statusEl = document.querySelector(
`.status-text[data-host="${index}"]`,
);
const canvas = document.querySelector(
`.sparkline-canvas[data-host="${index}"]`,
);
if (!latencyEl || !statusEl || !canvas) return;
if (host.lastLatency !== null) {
const cls = latencyClass(host.lastLatency, host.status);
latencyEl.innerHTML = `<span class="${cls}">${host.lastLatency}<span class="text-lg">ms</span></span>`;
} else if (host.status === "offline" || host.status === "error") {
latencyEl.innerHTML = `<span class="text-gray-500">---</span>`;
}
const avg = host.averageLatency();
if (host.status === "online" && avg !== null) {
statusEl.textContent = `avg: ${avg}ms`;
statusEl.className = `status-text text-xs mt-1 ${latencyClass(avg, "online")}`;
} else if (host.status === "offline") {
statusEl.textContent = "unreachable";
statusEl.className = "status-text text-xs text-red-400 mt-1";
} else if (host.status === "error") {
statusEl.textContent = "timeout";
statusEl.className = "status-text text-xs text-orange-400 mt-1";
} else {
statusEl.textContent = "connecting...";
statusEl.className = "status-text text-xs text-gray-500 mt-1";
}
SparklineRenderer.draw(canvas, host.history);
}
function updateSummary(state) {
const stats = state.wanStats();
const reachableEl = document.getElementById("summary-reachable");
const minEl = document.getElementById("summary-min");
const maxEl = document.getElementById("summary-max");
const avgEl = document.getElementById("summary-avg");
if (!reachableEl) return;
reachableEl.textContent = `${stats.reachable}/${stats.total}`;
reachableEl.className =
stats.reachable === stats.total
? "text-green-400"
: stats.reachable === 0
? "text-red-400"
: "text-yellow-400";
if (stats.min !== null) {
minEl.textContent = `${stats.min}ms`;
minEl.className = latencyClass(stats.min, "online");
maxEl.textContent = `${stats.max}ms`;
maxEl.className = latencyClass(stats.max, "online");
avgEl.textContent = `${stats.avg}ms`;
avgEl.className = latencyClass(stats.avg, "online");
} else {
for (const el of [minEl, maxEl, avgEl]) {
el.textContent = "--ms";
el.className = "text-gray-500";
}
}
}
function updateHealthBox(state) {
const el = document.getElementById("health-text");
const box = document.getElementById("health-box");
if (!el || !box) return;
const anyData = state.wan.some((h) => h.status !== "pending");
if (!anyData) return;
const healthy = state.isHealthy();
el.textContent = healthy ? "HEALTHY" : "DEGRADED";
el.className = healthy
? "text-green-400 font-bold"
: "text-red-400 font-bold";
box.className = `mt-4 p-3 rounded-lg border font-mono text-sm text-center ${
healthy
? "bg-green-900/20 border-green-700/50"
: "bg-red-900/20 border-red-700/50"
}`;
}
// --- Main Loop ---------------------------------------------------------------
async function tick(state) {
const ts = Date.now();
if (state.paused) {
// No probes — just push a paused marker so the chart keeps scrolling
for (const host of state.allHosts) {
host.pushPaused(ts);
}
// Redraw sparklines only
state.allHosts.forEach((host, i) => {
const canvas = document.querySelector(
`.sparkline-canvas[data-host="${i}"]`,
);
if (canvas) SparklineRenderer.draw(canvas, host.history);
});
return;
}
const results = await Promise.all(
state.allHosts.map((h) => measureLatency(h.url)),
);
state.allHosts.forEach((host, i) => {
host.pushSample(ts, results[i]);
updateHostRow(host, i);
});
updateSummary(state);
updateHealthBox(state);
}
// --- Pause / Resume ----------------------------------------------------------
function togglePause(state) {
state.paused = !state.paused;
const pauseIcon = document.getElementById("pause-icon");
const playIcon = document.getElementById("play-icon");
const pauseText = document.getElementById("pause-text");
const indicator = document.getElementById("status-indicator");
if (state.paused) {
pauseIcon.classList.add("hidden");
playIcon.classList.remove("hidden");
pauseText.textContent = "Resume";
indicator.textContent = "Paused";
indicator.className = "text-yellow-400";
} else {
pauseIcon.classList.remove("hidden");
playIcon.classList.add("hidden");
pauseText.textContent = "Pause";
indicator.textContent = "Running";
indicator.className = "text-green-400";
}
}
// --- Resize ------------------------------------------------------------------
function handleResize(state) {
document.querySelectorAll(".sparkline-canvas").forEach((canvas, i) => {
SparklineRenderer.sizeCanvas(canvas);
const host = state.allHosts[i];
if (host) SparklineRenderer.draw(canvas, host.history);
});
}
// --- Bootstrap ---------------------------------------------------------------
async function init() {
// Probe common gateway IPs to find the local router
const gateway = await detectGateway();
const localHosts = [LOCAL_CPE];
if (gateway) localHosts.push(gateway);
const state = new AppState(localHosts);
buildUI(state);
document
.getElementById("pause-btn")
.addEventListener("click", () => togglePause(state));
tick(state);
setInterval(() => tick(state), CONFIG.updateInterval);
window.addEventListener("resize", () => handleResize(state));
setTimeout(() => handleResize(state), 100);
}
if (document.readyState === "loading") {
document.addEventListener("DOMContentLoaded", init);
} else {
init();
}