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// Copyright 2019-2020 Yusuke Sakurai. All rights reserved. MIT license.import {  listenAndServe,  listenAndServeTls,  ServeListener,  ServeOptions,  ServerRequest,} from "./server.ts";import { createLogger, Logger, Loglevel, namedLogger } from "./logger.ts";import { createRouter, Router } from "./router.ts";import { RoutingError } from "./error.ts";export interface App extends Router {  /** Start listening with given addr */  listen(addr: Deno.ListenOptions, opts?: ServeOptions): ServeListener;
  /** Start listening for HTTPS server */  listenTls(    tlsOptions: Deno.ListenTlsOptions,    opts?: ServeOptions,  ): ServeListener;}
export interface AppOptions {  logger?: Logger;  logLevel?: Loglevel;}
/** Create App */export function createApp(  opts: AppOptions = {    logger: createLogger(),  },): App {  const { info, error } = namedLogger("servest:router", opts.logger);  const router = createRouter();  const finalErrorHandler = async (e: any, req: ServerRequest) => {    if (e instanceof RoutingError) {      await req.respond({        status: e.status,        body: e.message,      });    } else {      if (e instanceof Error) {        await req.respond({          status: 500,          body: e.stack,        });        if (e.stack) {          error(e.stack);        }      } else {        await req.respond({          status: 500,          body: "Internal Server Error",        });        error(e);      }    }  };  const handleRoute = async (p: string, req: ServerRequest) => {    try {      await router.handleRoute(p, req);    } catch (e) {      if (!req.isResponded()) {        await finalErrorHandler(e, req);      }    } finally {      if (!req.isResponded()) {        await finalErrorHandler(new RoutingError(404), req);      }      info(`${req.respondedStatus()} ${req.method} ${req.url}`);    }  };  function listen(    addr: Deno.ListenOptions,    opts?: ServeOptions,  ): ServeListener {    const listener = listenAndServe(addr, (req) => handleRoute("", req), opts);    info(`listening on ${addr.hostname || ""}:${addr.port}`);    return listener;  }  function listenTls(    listenOptions: Deno.ListenTlsOptions,    opts?: ServeOptions,  ): ServeListener {    const listener = listenAndServeTls(      listenOptions,      (req) => handleRoute("", req),      opts,    );    info(`listening on ${listenOptions.hostname || ""}:${listenOptions.port}`);    return listener;  }  return { ...router, handleRoute, listen, listenTls };}