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[READ-ONLY] Mirror of https://github.com/openstatusHQ/openstatus. 🫖 Status page with uptime monitoring & API monitoring as code 🫖 openstatus.dev
bun drizzle-orm monitoring monitoring-as-code nextjs observability on-call open-source shadcn-ui status-page statuspage synthetic-monitoring tinybird turso uptime uptime-checker uptime-monitor
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1.6 kB · 44 lines
TypeScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445import { type CdnProvider, inferTopology } from "@openstatus/header-analysis";
import type { CdnRegionResponse, CdnSummary } from "./schema";
// STALE counts as cached: the response was served from the edge cache// (stale-while-revalidate), not from originconst CACHED_STATUSES = new Set(["HIT", "STALE"]);
export function computeCdnSummary(rows: CdnRegionResponse[]): CdnSummary { const responded = rows.filter((row) => row.state === "success"); const unreachable = rows.filter((row) => row.state === "error");
const cached = responded.filter((row) => CACHED_STATUSES.has(row.cacheStatus), ); const uncached = responded.filter( (row) => !CACHED_STATUSES.has(row.cacheStatus), );
const providerCounts = new Map<CdnProvider, number>(); for (const row of responded) { if (!row.cdn) continue; providerCounts.set(row.cdn, (providerCounts.get(row.cdn) ?? 0) + 1); } const ranked = [...providerCounts.entries()].sort((a, b) => b[1] - a[1]); // a tie means no true majority: report null instead of an arbitrary winner const hasTie = ranked.length > 1 && ranked[0][1] === ranked[1][1]; const cdn = ranked[0] && !hasTie ? ranked[0][0] : null;
const topology = inferTopology(responded, cdn);
return { type: "summary", totalRegions: rows.length, respondedRegions: responded.length, cachedRegions: cached.length, uncachedRegions: uncached.map((row) => row.region), unreachableRegions: unreachable.map((row) => row.region), cdn, mixedCdn: providerCounts.size > 1, topology: topology.topology, topologyBasis: topology.basis, };}