health.ts

import * as http from "http"
import { HttpCode, HttpError } from "../../common/http"
import { HttpProvider, HttpResponse, Route, Heart, HttpProviderOptions } from "../http"

/**
 * Check the heartbeat.
 */
export class HealthHttpProvider extends HttpProvider {
  public constructor(options: HttpProviderOptions, private readonly heart: Heart) {
    super(options)
  }

  public async handleRequest(route: Route, request: http.IncomingMessage): Promise<HttpResponse> {
    if (!this.authenticated(request)) {
      if (this.isRoot(route)) {
        return { redirect: "/login", query: { to: route.fullPath } }
      }
      throw new HttpError("Unauthorized", HttpCode.Unauthorized)
    }

    const result = {
      cache: false,
      mime: "application/json",
      content: {
        status: this.heart.alive() ? "alive" : "expired",
        lastHeartbeat: this.heart.lastHeartbeat,
      },
    }

    return result
  }
}