497 lines
15 KiB
Dart
497 lines
15 KiB
Dart
library angel_framework.http.server;
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import 'dart:async';
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import 'dart:io';
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import 'dart:math' show Random;
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import 'dart:mirrors';
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import 'package:angel_route/angel_route.dart';
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import 'angel_base.dart';
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import 'angel_http_exception.dart';
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import 'controller.dart';
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import 'fatal_error.dart';
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import 'request_context.dart';
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import 'response_context.dart';
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import 'routable.dart';
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import 'service.dart';
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export 'package:container/container.dart';
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final RegExp _straySlashes = new RegExp(r'(^/+)|(/+$)');
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/// A function that binds an [Angel] server to an Internet address and port.
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typedef Future<HttpServer> ServerGenerator(InternetAddress address, int port);
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/// Handles an [AngelHttpException].
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typedef Future AngelErrorHandler(
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AngelHttpException err, RequestContext req, ResponseContext res);
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/// A function that configures an [AngelBase] server in some way.
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typedef Future AngelConfigurer(AngelBase app);
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/// A powerful real-time/REST/MVC server class.
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class Angel extends AngelBase {
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StreamController<HttpRequest> _afterProcessed =
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new StreamController<HttpRequest>.broadcast();
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StreamController<HttpRequest> _beforeProcessed =
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new StreamController<HttpRequest>.broadcast();
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StreamController<AngelFatalError> _fatalErrorStream =
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new StreamController<AngelFatalError>.broadcast();
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StreamController<Controller> _onController =
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new StreamController<Controller>.broadcast();
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final List<Angel> _children = [];
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Angel _parent;
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final Random _rand = new Random.secure();
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ServerGenerator _serverGenerator = HttpServer.bind;
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final Map<dynamic, InjectionRequest> _preContained = {};
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/// Fired after a request is processed. Always runs.
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Stream<HttpRequest> get afterProcessed => _afterProcessed.stream;
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/// Fired before a request is processed. Always runs.
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Stream<HttpRequest> get beforeProcessed => _beforeProcessed.stream;
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/// All child application mounted on this instance.
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List<Angel> get children => new List<Angel>.unmodifiable(_children);
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/// Fired on fatal errors.
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Stream<AngelFatalError> get fatalErrorStream => _fatalErrorStream.stream;
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/// Indicates whether the application is running in a production environment.
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///
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/// The criteria for this is the `ANGEL_ENV` environment variable being set to
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/// `'production'`.
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bool get isProduction => Platform.environment['ANGEL_ENV'] == 'production';
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/// Fired whenever a controller is added to this instance.
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///
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/// **NOTE**: This is a broadcast stream.
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Stream<Controller> get onController => _onController.stream;
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/// Returns the parent instance of this application, if any.
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Angel get parent => _parent;
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/// Always run before responses are sent.
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///
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/// These will only not run if an [AngelFatalError] occurs.
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final List<RequestHandler> responseFinalizers = [];
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/// Default error handler, show HTML error page
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AngelErrorHandler _errorHandler =
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(AngelHttpException e, req, ResponseContext res) {
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res.headers[HttpHeaders.CONTENT_TYPE] = ContentType.HTML.toString();
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res.statusCode = e.statusCode;
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res.write("<!DOCTYPE html><html><head><title>${e.message}</title>");
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res.write("</head><body><h1>${e.message}</h1><ul>");
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for (String error in e.errors) {
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res.write("<li>$error</li>");
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}
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res.write("</ul></body></html>");
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res.end();
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};
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/// The handler currently configured to run on [AngelHttpException]s.
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AngelErrorHandler get errorHandler => _errorHandler;
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/// [RequestMiddleware] to be run before all requests.
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final List before = [];
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/// [RequestMiddleware] to be run after all requests.
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final List after = [];
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/// The native HttpServer running this instancce.
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HttpServer httpServer;
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/// Handles a server error.
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_onError(e, [StackTrace st]) {
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_fatalErrorStream.add(new AngelFatalError(error: e, stack: st));
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}
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void _printDebug(x) {
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if (debug) print(x);
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}
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String _randomString(int length) {
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var codeUnits = new List.generate(length, (index) {
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return _rand.nextInt(33) + 89;
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});
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return new String.fromCharCodes(codeUnits);
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}
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/// Starts the server.
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///
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/// Returns false on failure; otherwise, returns the HttpServer.
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Future<HttpServer> startServer([InternetAddress address, int port]) async {
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var host = address ?? InternetAddress.LOOPBACK_IP_V4;
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this.httpServer = await _serverGenerator(host, port ?? 0);
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preprocessRoutes();
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return httpServer..listen(handleRequest);
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}
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/// Loads some base dependencies into the service container.
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void bootstrapContainer() {
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if (runtimeType != Angel) container.singleton(this, as: Angel);
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container.singleton(this, as: AngelBase);
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container.singleton(this, as: Routable);
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container.singleton(this, as: Router);
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container.singleton(this);
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}
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Future<bool> executeHandler(
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handler, RequestContext req, ResponseContext res) async {
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if (handler is RequestMiddleware) {
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var result = await handler(req, res);
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if (result is bool)
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return result == true;
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else if (result != null) {
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res.serialize(result);
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return false;
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} else
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return res.isOpen;
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}
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if (handler is RequestHandler) {
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await handler(req, res);
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return res.isOpen;
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}
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if (handler is Future) {
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var result = await handler;
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if (result is bool)
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return result == true;
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else if (result != null) {
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res.serialize(result);
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return false;
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} else
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return true;
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}
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if (handler is Function) {
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var result = await runContained(handler, req, res);
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if (result is bool)
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return result == true;
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else if (result != null) {
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res.serialize(result);
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return false;
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} else
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return true;
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}
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if (requestMiddleware.containsKey(handler)) {
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return await executeHandler(requestMiddleware[handler], req, res);
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}
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res.serialize(handler);
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return false;
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}
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Future<RequestContext> createRequestContext(HttpRequest request) {
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_beforeProcessed.add(request);
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return RequestContext.from(request, this);
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}
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Future<ResponseContext> createResponseContext(HttpResponse response) async =>
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new ResponseContext(response, this);
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/// Handles a single request.
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Future handleRequest(HttpRequest request) async {
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try {
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var req = await createRequestContext(request);
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var res = await createResponseContext(request.response);
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String requestedUrl = request.uri.path.replaceAll(_straySlashes, '');
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if (requestedUrl.isEmpty) requestedUrl = '/';
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var resolved =
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resolveAll(requestedUrl, requestedUrl, method: request.method);
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for (var result in resolved) req.params.addAll(result.allParams);
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if (resolved.isNotEmpty) {
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var route = resolved.first.route;
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req.inject(Match, route.match(requestedUrl));
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}
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var m = new MiddlewarePipeline(resolved);
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req.inject(MiddlewarePipeline, m);
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var pipeline = []..addAll(before)..addAll(m.handlers)..addAll(after);
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_printDebug('Handler sequence on $requestedUrl: $pipeline');
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for (var handler in pipeline) {
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try {
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_printDebug('Executing handler: $handler');
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var result = await executeHandler(handler, req, res);
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_printDebug('Result: $result');
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if (!result) {
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_printDebug('Last executed handler: $handler');
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break;
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} else {
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_printDebug(
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'Handler completed successfully, did not terminate response: $handler');
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}
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} catch (e, st) {
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_printDebug('Caught error in handler $handler: $e');
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_printDebug(st);
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if (e is AngelHttpException) {
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// Special handling for AngelHttpExceptions :)
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try {
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res.statusCode = e.statusCode;
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List<String> accept =
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request.headers[HttpHeaders.ACCEPT] ?? ['*/*'];
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if (accept.isEmpty ||
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accept.contains('*/*') ||
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accept.contains(ContentType.JSON.mimeType) ||
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accept.contains("application/javascript")) {
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res.serialize(e.toMap());
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} else {
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await _errorHandler(e, req, res);
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}
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// _finalizeResponse(request, res);
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} catch (e, st) {
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_fatalErrorStream.add(
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new AngelFatalError(request: request, error: e, stack: st));
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}
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} else {
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_fatalErrorStream.add(
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new AngelFatalError(request: request, error: e, stack: st));
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}
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break;
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}
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}
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try {
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await sendRequest(request, req, res);
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} catch (e, st) {
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_fatalErrorStream
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.add(new AngelFatalError(request: request, error: e, stack: st));
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}
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} catch (e, st) {
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_fatalErrorStream
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.add(new AngelFatalError(request: request, error: e, stack: st));
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}
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}
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/// Preprocesses all routes, and eliminates the burden of reflecting handlers
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/// at run-time.
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void preprocessRoutes() {
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_add(v) {
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if (v is Function && !_preContained.containsKey(v)) {
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_preContained[v] = preInject(v);
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}
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}
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void _walk(Router router) {
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if (router is Angel) {
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router..before.forEach(_add)..after.forEach(_add);
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}
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router.requestMiddleware.forEach((k, v) => _add(v));
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router.middleware.forEach(_add);
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router.routes
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.where((r) => r is SymlinkRoute)
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.map((SymlinkRoute r) => r.router)
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.forEach(_walk);
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}
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_walk(this);
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}
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/// Run a function after injecting from service container.
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/// If this function has been reflected before, then
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/// the execution will be faster, as the injection requirements were stored beforehand.
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Future runContained(
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Function handler, RequestContext req, ResponseContext res) {
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if (_preContained.containsKey(handler)) {
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return handleContained(handler, _preContained[handler])(req, res);
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}
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return runReflected(handler, req, res);
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}
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/// Runs with DI, and *always* reflects. Prefer [runContained].
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Future runReflected(
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Function handler, RequestContext req, ResponseContext res) async {
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var h =
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handleContained(handler, _preContained[handler] = preInject(handler));
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return await h(req, res);
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// return await closureMirror.apply(args).reflectee;
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}
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/// Sends a response.
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Future sendRequest(
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HttpRequest request, RequestContext req, ResponseContext res) async {
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_afterProcessed.add(request);
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if (!res.willCloseItself) {
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for (var finalizer in responseFinalizers) {
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await finalizer(req, res);
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}
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for (var key in res.headers.keys) {
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request.response.headers.add(key, res.headers[key]);
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}
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request.response.headers
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..chunkedTransferEncoding = res.chunked ?? true
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..set(HttpHeaders.CONTENT_LENGTH, res.buffer.length);
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request.response
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..statusCode = res.statusCode
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..cookies.addAll(res.cookies)
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..add(res.buffer.takeBytes());
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await request.response.close();
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}
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}
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/// Applies an [AngelConfigurer] to this instance.
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Future configure(AngelConfigurer configurer) async {
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await configurer(this);
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if (configurer is Controller)
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_onController.add(controllers[configurer.findExpose().path] = configurer);
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}
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/// Starts the server, wrapped in a [runZoned] call.
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void listen({InternetAddress address, int port: 3000}) {
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runZoned(() async {
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await startServer(address, port);
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}, onError: _onError);
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}
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/// Mounts the child on this router.
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///
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/// If the router is an [Angel] instance, all controllers
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/// will be copied, as well as services and response finalizers.
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///
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/// [before] and [after] will be preserved.
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///
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/// NOTE: The above will not be properly copied if [path] is
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/// a [RegExp].
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@override
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use(Pattern path, Routable routable,
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{bool hooked: true, String namespace: null}) {
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var head = path.toString().replaceAll(_straySlashes, '');
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if (routable is Angel) {
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_children.add(routable.._parent = this);
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_preContained.addAll(routable._preContained);
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if (routable.before.isNotEmpty) {
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all(path, (req, res) {
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return true;
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}, middleware: routable.before);
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}
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if (routable.after.isNotEmpty) {
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all(path, (req, res) {
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return true;
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}, middleware: routable.after);
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}
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if (routable.responseFinalizers.isNotEmpty) {
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responseFinalizers.add((req, res) async {
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if (req.path.replaceAll(_straySlashes, '').startsWith(head)) {
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for (var finalizer in routable.responseFinalizers)
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await finalizer(req, res);
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}
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return true;
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});
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}
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routable.controllers.forEach((k, v) {
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var tail = k.toString().replaceAll(_straySlashes, '');
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controllers['$head/$tail'.replaceAll(_straySlashes, '')] = v;
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});
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routable.services.forEach((k, v) {
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var tail = k.toString().replaceAll(_straySlashes, '');
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services['$head/$tail'.replaceAll(_straySlashes, '')] = v;
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});
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}
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if (routable is Service) {
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routable.app = this;
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}
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return super.use(path, routable, hooked: hooked, namespace: namespace);
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}
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/// Registers a callback to run upon errors.
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onError(AngelErrorHandler handler) {
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_errorHandler = handler;
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}
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/// Default constructor. ;)
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Angel({bool debug: false}) : super(debug: debug == true) {
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bootstrapContainer();
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}
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/// An instance mounted on a server started by the [serverGenerator].
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factory Angel.custom(ServerGenerator serverGenerator, {bool debug: false}) =>
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new Angel(debug: debug == true).._serverGenerator = serverGenerator;
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/// Creates an HTTPS server.
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///
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/// Provide paths to a certificate chain and server key (both .pem).
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/// If no password is provided, a random one will be generated upon running
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/// the server.
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factory Angel.secure(String certificateChainPath, String serverKeyPath,
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{bool debug: false, String password}) {
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var app = new Angel(debug: debug == true);
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app._serverGenerator = (InternetAddress address, int port) async {
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var certificateChain =
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Platform.script.resolve(certificateChainPath).toFilePath();
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var serverKey = Platform.script.resolve(serverKeyPath).toFilePath();
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var serverContext = new SecurityContext();
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serverContext.useCertificateChain(certificateChain);
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serverContext.usePrivateKey(serverKey,
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password: password ?? app._randomString(8));
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return await HttpServer.bindSecure(address, port, serverContext);
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};
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return app;
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}
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}
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/// Predetermines what needs to be injected for a handler to run.
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InjectionRequest preInject(Function handler) {
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ClosureMirror closureMirror = reflect(handler);
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var injection = new InjectionRequest();
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// Load parameters
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for (var parameter in closureMirror.function.parameters) {
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var name = MirrorSystem.getName(parameter.simpleName);
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var type = parameter.type.reflectedType;
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if (!parameter.isNamed) {
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if (parameter.isOptional) injection.optional.add(name);
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if (type == RequestContext || type == ResponseContext) {
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injection.required.add(type);
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} else if (name == 'req') {
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injection.required.add(RequestContext);
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} else if (name == 'res') {
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injection.required.add(ResponseContext);
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} else if (type == dynamic) {
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injection.required.add(name);
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} else {
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injection.required.add([name, type]);
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}
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} else {
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injection.named[name] = type;
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}
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}
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return injection;
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}
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