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SnapOtterandGitHub
d690a6e26d
Adds /api/status to the landing Pages worker, HEAD-probing demo.snapotter.com and docs.snapotter.com with a 2 second per-attempt deadline and one retry. snapotter.com is not probed; the worker answering the request is the proof it is up. The footer badge ships grey in the static HTML and only upgrades once the route answers. A rejected fetch, a non-ok response, an unparseable body, and an unrecognized verdict all leave it grey, so it never claims green on its own. Color lives in the dot, never the label: `--color-success` scores 4.498:1 against the footer's `--color-background-alt`, just under AA. Four labels across 21 locales.
82 lines
3.0 KiB
JavaScript
82 lines
3.0 KiB
JavaScript
// snapotter.com needs no probe: this worker answering the request is the proof
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// it is up. Only the two sibling properties are checked.
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const STATUS_PROBES = ["https://demo.snapotter.com/", "https://docs.snapotter.com/"];
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// Probed at the edge rather than read from the Sentry uptime API: no standing
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// credential on a public worker, and no 15-minute lag from Sentry's 5-minute
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// interval times its 3-strike rule.
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//
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// One immediate retry absorbs a transient blip. `redirect: "manual"` stops the
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// follow, so a 3xx arrives as-is and still counts as up.
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async function probe(url) {
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for (let attempt = 0; attempt < 2; attempt++) {
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// Built outside the try, so a throw here surfaces as the runtime bug it is
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// rather than being read as a down leg. Built inside the loop, so each
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// attempt carries its own deadline: hoisting it above the loop would leave
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// attempt 2 holding an already-fired signal, silently deleting the retry
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// for the exact transient-blip case the retry exists to absorb.
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const signal = AbortSignal.timeout(2000);
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let res;
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try {
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res = await fetch(url, { method: "HEAD", redirect: "manual", signal });
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} catch {
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// A throw is a timeout or a network error, which is a legitimate "down"
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// signal rather than a swallowed bug. Retry once, then report the leg
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// down. Only the fetch is guarded, so nothing below can be swallowed.
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continue;
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}
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if (res.status < 400) return true;
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}
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return false;
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}
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async function statusResponse() {
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const legs = await Promise.all(STATUS_PROBES.map((url) => probe(url)));
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const downCount = legs.filter((up) => !up).length;
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const status = downCount === 0 ? "operational" : downCount === legs.length ? "down" : "partial";
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// A false green is cheap to sit on for a minute; a false red is not, and it
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// would otherwise pin in the browser across every navigation until it aged
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// out. Recheck a bad verdict sooner.
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const maxAge = status === "operational" ? 60 : 15;
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// `_headers` only decorates env.ASSETS responses in advanced mode, so a
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// synthesized response has to carry its own.
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return new Response(JSON.stringify({ status }), {
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headers: {
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"Content-Type": "application/json; charset=utf-8",
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"Cache-Control": `public, max-age=${maxAge}`,
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"X-Robots-Tag": "noindex",
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},
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});
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}
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export default {
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async fetch(request, env) {
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const url = new URL(request.url);
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if (url.hostname === "www.snapotter.com") {
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url.hostname = "snapotter.com";
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return Response.redirect(url.toString(), 301);
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}
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if (url.pathname === "/api/status") {
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return statusResponse();
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}
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const response = await env.ASSETS.fetch(request);
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if (url.pathname.startsWith("/_next/static/") || url.pathname.startsWith("/_next/data/")) {
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const headers = new Headers(response.headers);
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headers.set("X-Robots-Tag", "noindex, nofollow");
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return new Response(response.body, {
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status: response.status,
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statusText: response.statusText,
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headers,
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});
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}
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return response;
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},
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};
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