Function main

apps/hash-api/src/index.ts:346–966

()

});

const main = async () => {
  logger.info("Type System initialized");

  // Request ID generator
  const nanoid = customAlphabet(
    "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz",
    14,
  );

  // Configure the StatsD client for reporting metrics
  let statsd: StatsD | undefined;
  try {
    if (isStatsDEnabled) {
      const statsdHost = process.env.STATSD_HOST;
      const statsdPort = Number.parseInt(process.env.STATSD_PORT || "8125", 10);
      await waitOnResource(`tcp:${statsdHost}:${statsdPort}`, logger);

      statsd = new StatsD({
        host: statsdHost,
        port: statsdPort,
      });
      shutdown.addCleanup("StatsD", async () => {
        // eslint-disable-next-line @typescript-eslint/unbound-method
        await promisify((statsd as StatsD).close).bind(statsd)();
      });
    }
  } catch (error) {
    logger.error("Could not start StatsD client", { error });
  }

  app.use(cors(CORS_CONFIG));

  if (isProdEnv && !isSelfHostedInstance) {
    /**
     * In production, hosted HASH, take the client IP from the Cloudflare-set header.
     */
    Object.defineProperty(app.request, "ip", {
      configurable: true,
      enumerable: true,
      get() {
        return this.get("cf-connecting-ip");
      },
    });
  }

  // Add logging of requests. /graphql is logged at the operation level
  // (query/mutation name) by the Apollo plugin in `create-apollo-server.ts`,
  // so logging it here would be a less informative duplicate.
  app.use((req, res, next) => {
    const requestId = nanoid();
    res.set("x-hash-request-id", requestId);

    if (req.path !== "/graphql") {
      logger.info(`${req.method} ${req.path}`, {
        requestId,
        origin: req.headers.origin,
        ip: req.ip,
        userAgent: req.headers["user-agent"],