import path from "node:path"; import fs, { Stats } from "node:fs"; import type { BunFile, Serve } from "bun"; import * as Sentry from "@sentry/node"; import prom from "bun-prometheus-client"; import log from "loglevel"; import config from "./config"; log.setLevel((Bun.env.LOG_LEVEL || "info") as log.LogLevelDesc); Sentry.init({ release: `homestead@${Bun.env.FLY_MACHINE_VERSION}`, tracesSampleRate: 1.0, }); const expectedHostURL = new URL( Bun.env.NODE_ENV === "production" ? config.base_url : "http://localhost:3000", ); const defaultHeaders = { ...config.extra.headers, vary: "Accept-Encoding", }; type File = { filename: string; handle: BunFile; relPath: string; headers?: Record; type: string; size: number; mtime: Date; }; const metrics = { requests: new prom.Counter({ name: "homestead_requests", help: "Number of requests by path, status code, and method", labelNames: ["path", "status_code", "method", "content_encoding"], }), requestDuration: new prom.Histogram({ name: "homestead_request_duration_seconds", help: "Request duration in seconds", labelNames: ["path"], }), }; let files = new Map(); function registerFile( path: string, pathname: string, filename: string, stat: Stats, ): void { pathname = "/" + (pathname === "." || pathname === "./" ? "" : pathname); if (files.get(pathname) !== undefined) { console.warn("File already registered:", pathname); } const handle = Bun.file(filename); files.set(pathname, { filename, relPath: "/" + path, handle: handle, type: pathname.startsWith("/feed-styles.xsl") ? "text/xsl" : handle.type, headers: pathname === "/404.html" ? Object.assign({}, defaultHeaders, { "cache-control": "no-cache" }) : undefined, size: stat.size, mtime: stat.mtime, }); } function walkDirectory(root: string, dir: string) { const absDir = path.join(root, dir); for (let pathname of fs.readdirSync(absDir)) { const relPath = path.join(dir, pathname); const absPath = path.join(absDir, pathname); const stat = fs.statSync(absPath); if (stat.isDirectory()) { walkDirectory(root, relPath + path.sep); } else if (stat.isFile()) { if (pathname.startsWith("index.html")) { const dir = relPath.replace("index.html", ""); registerFile(relPath, dir, absPath, stat); if (dir !== "") { registerFile(relPath, dir + path.sep, absPath, stat); } } else { registerFile(relPath, relPath, absPath, stat); } } } } walkDirectory("public/", ""); async function serveFile( file: File | undefined, statusCode: number = 200, extraHeaders: Record = {}, ): Promise { return new Response(await file.handle.arrayBuffer(), { headers: { "last-modified": file.mtime.toUTCString(), ...extraHeaders, ...(file.headers || defaultHeaders), }, status: statusCode, }); } function parseIfModifiedSinceHeader(header: string | null): number { return header ? new Date(header).getTime() + 999 : 0; } export const metricsServer = { port: 9091, fetch: async function (request) { const pathname = new URL(request.url).pathname; switch (pathname) { case "/metrics": return new Response(await prom.register.metrics()); default: return new Response("", { status: 404 }); } }, } satisfies Serve; export const server = { fetch: async function (request) { const url = new URL(request.url); const pathname = url.pathname.replace(/\/\/+/g, "/"); const endTimer = metrics.requestDuration.startTimer({ path: pathname }); const transaction = Sentry.startTransaction({ name: pathname, op: "http.server", description: `${request.method} ${pathname}`, tags: { url: request.url, "http.host": request.headers.get("host"), "http.method": request.method, "http.user_agent": request.headers.get("user-agent"), }, }); try { if (pathname === "/health") { return new Response("OK", { status: 200 }); } else if ( config.redirect_other_hostnames && request.headers.get("host") !== expectedHostURL.host ) { return new Response("", { status: 301, headers: { location: new URL(pathname, expectedHostURL).toString(), }, }); } const file = files.get(pathname); let contentEncoding = "identity"; let suffix = ""; if (file && (await file.handle.exists())) { if ( parseIfModifiedSinceHeader( request.headers.get("if-modified-since"), ) >= file?.mtime.getTime() ) { metrics.requests.inc({ method: request.method, path: pathname, status_code: 304, }); transaction.setHttpStatus(304); return new Response("", { status: 304, headers: defaultHeaders }); } const encodings = (request.headers.get("accept-encoding") || "") .split(",") .map((x) => x.trim().toLowerCase()); if (encodings.includes("br") && files.has(pathname + ".br")) { contentEncoding = "br"; suffix = ".br"; } else if (encodings.includes("zstd") && files.has(pathname + ".zst")) { contentEncoding = "zstd"; suffix = ".zst"; } else if (encodings.includes("gzip") && files.has(pathname + ".gz")) { contentEncoding = "gzip"; suffix = ".gz"; } const status = 200; transaction.setHttpStatus(status); metrics.requests.inc({ method: request.method, path: pathname, status_code: status, content_encoding: contentEncoding, }); return serveFile(files.get(pathname + suffix), status, { "content-encoding": contentEncoding, "content-type": file.type, }); } else { if (files.has(pathname + "/")) { log.info(`Redirecting to: ${pathname + "/"}`); metrics.requests.inc({ method: request.method, path: pathname, status_code: 302, }); return new Response("", { status: 302, headers: { location: pathname + "/" }, }); } metrics.requests.inc({ method: request.method, path: pathname, status_code: 404, content_encoding: "identity", }); transaction.setHttpStatus(404); const notfound = files.get("/404.html"); if (notfound) { return serveFile(notfound, 404, { "content-type": "text/html; charset=utf-8", }); } else { log.warn("404.html not found"); return new Response("404 Not Found", { status: 404, headers: { "content-type": "text/plain", ...defaultHeaders }, }); } } } catch (error) { transaction.setHttpStatus(503); metrics.requests.inc({ method: request.method, path: pathname, status_code: 503, content_encoding: "identity", }); Sentry.captureException(error); return new Response("Something went wrong", { status: 503 }); } finally { const seconds = endTimer(); metrics.requestDuration.observe(seconds); transaction.finish(); } }, } satisfies Serve;