pr_01m47d15m3e54sn21z27rpy5n9/apps/web/app/lib/status.server.ts
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| Invite-only launch: sign in with GitHub, repository access and lifecycle, many emails, a new look | 1 | /** |
| 2 | * The checks behind /status and the footer's dot. Each is one cheap call, | |
| 3 | * the same a visitor's request would make, with a short timeout, all at | |
| 4 | * once. The report is kept in the data centre's cache for a minute, so | |
| 5 | * however many people look, each part is checked at most once a minute | |
| 6 | * per data centre. | |
| 7 | * | |
| 8 | * The public hosts (api, mcp, docs, models, g1t.page) are fetched over the | |
| 9 | * internet, as their users reach them; the rest through service bindings. | |
| 10 | */ | |
| 11 | import { billing, identity, repos } from "./services.server"; | |
| 12 | import { type ComponentKey, type ProbeResult, type StatusReport, report } from "./status"; | |
| 13 | ||
| 14 | /** No check waits longer than this. */ | |
| 15 | const TIMEOUT_MS = 3000; | |
| 16 | /** How long one report is served before the parts are checked again. */ | |
| 17 | const CACHE_SECONDS = 60; | |
| 18 | /** Where the report is kept: a key in the cache, never a page anyone fetches. */ | |
| 19 | const CACHE_KEY = "https://g1t.sh/__status/report/v1"; | |
| 20 | /** A public repository that has always existed, to look up. */ | |
| 21 | const PROBE_REPO = { namespace: "flagon-io", name: "g1t" }; | |
| 22 | /** A session token that cannot exist: the lookup answers "nobody". */ | |
| 23 | const NO_SESSION = "0".repeat(64); | |
| 24 | ||
| 25 | class Timeout extends Error {} | |
| 26 | ||
| 27 | async function timed(run: (signal: AbortSignal) => Promise<boolean | string>): Promise<ProbeResult> { | |
| 28 | const started = Date.now(); | |
| 29 | const controller = new AbortController(); | |
| 30 | let timer: ReturnType<typeof setTimeout> | undefined; | |
| 31 | const deadline = new Promise<never>((_, reject) => { | |
| 32 | timer = setTimeout(() => { | |
| 33 | controller.abort(); | |
| 34 | reject(new Timeout()); | |
| 35 | }, TIMEOUT_MS); | |
| 36 | }); | |
| 37 | try { | |
| 38 | const outcome = await Promise.race([run(controller.signal), deadline]); | |
| 39 | const ms = Date.now() - started; | |
| 40 | return outcome === true ? { ok: true, ms } : { ok: false, ms, error: typeof outcome === "string" ? outcome : "unexpected answer" }; | |
| 41 | } catch (error) { | |
| 42 | const ms = Date.now() - started; | |
| 43 | return { ok: false, ms, error: error instanceof Timeout ? "timed out" : "could not connect" }; | |
| 44 | } finally { | |
| 45 | clearTimeout(timer); | |
| 46 | } | |
| 47 | } | |
| 48 | ||
| 49 | /** A public address answering 2xx. The body is not read. */ | |
| 50 | function reachable(url: string, headers: Record<string, string> = {}) { | |
| 51 | return timed(async (signal) => { | |
| 52 | const response = await fetch(url, { | |
| 53 | signal, | |
| 54 | redirect: "manual", | |
| 55 | headers: { "user-agent": "g1t-status (+https://g1t.sh/status)", ...headers }, | |
| 56 | }); | |
| 57 | await response.body?.cancel().catch(() => undefined); | |
| 58 | return response.ok || `HTTP ${response.status}`; | |
| 59 | }); | |
| 60 | } | |
| 61 | ||
| 62 | async function probeAll(): Promise<Partial<Record<ComponentKey, ProbeResult | null>>> { | |
| 63 | const checks: [ComponentKey, Promise<ProbeResult> | null][] = [ | |
| 64 | // Every page asks identity who is signed in; a token nobody holds | |
| 65 | // answers "nobody" after a database read. | |
| 66 | ["site", timed(async () => (await identity.userForSession(NO_SESSION), true))], | |
| 67 | ["api", reachable("https://api.g1t.sh/")], | |
| 68 | // A lookup answers, found or not, once the repository service and its | |
| 69 | // database are up. | |
| 70 | ["git", timed(async () => (await repos.get(PROBE_REPO, null), true))], | |
| 71 | ["mcp", reachable("https://mcp.g1t.sh/", { accept: "application/json" })], | |
| 72 | ["docs", reachable("https://docs.g1t.sh/")], | |
| 73 | ["deployments", reachable("https://g1t.page/")], | |
| 74 | ["agents", reachable("https://models.g1t.sh/")], | |
| 75 | // Not checked yet: see COMPONENTS in status.ts. | |
| 76 | ["sandboxes", null], | |
| 77 | ["billing", timed(async () => Boolean(await billing.prices()) || "no price book")], | |
| 78 | ]; | |
| 79 | const results = await Promise.all(checks.map(async ([key, check]) => [key, check ? await check : null] as const)); | |
| 80 | return Object.fromEntries(results); | |
| 81 | } | |
| 82 | ||
| 83 | function edgeCache(): Cache | null { | |
| 84 | // The Workers runtime's own cache, which the DOM types do not know. | |
| 85 | const store = (globalThis as { caches?: { default?: Cache } }).caches; | |
| 86 | return store?.default ?? null; | |
| 87 | } | |
| 88 | ||
| 89 | /** The current report: from the cache when it is under a minute old, else checked now. */ | |
| 90 | export async function currentStatus(): Promise<StatusReport> { | |
| 91 | const cache = edgeCache(); | |
| 92 | if (cache) { | |
| 93 | try { | |
| 94 | const hit = await cache.match(CACHE_KEY); | |
| 95 | if (hit) return (await hit.json()) as StatusReport; | |
| 96 | } catch { | |
| 97 | // A cache that fails is only slower. | |
| 98 | } | |
| 99 | } | |
| 100 | const fresh = report(await probeAll(), new Date()); | |
| 101 | if (cache) { | |
| 102 | try { | |
| 103 | await cache.put( | |
| 104 | CACHE_KEY, | |
| 105 | Response.json(fresh, { headers: { "cache-control": `public, max-age=${CACHE_SECONDS}` } }), | |
| 106 | ); | |
| 107 | } catch { | |
| 108 | // Checked again next time. | |
| 109 | } | |
| 110 | } | |
| 111 | return fresh; | |
| 112 | } | |
| 113 | ||
| 114 | /** Headers for a response carrying the report: browsers and the edge may keep it a minute. */ | |
| 115 | export const STATUS_HEADERS = { "cache-control": `public, max-age=${CACHE_SECONDS}` }; |