99 lines
3.7 KiB
Markdown
99 lines
3.7 KiB
Markdown
# Angel3 Shelf
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[](https://dart.dev/null-safety)
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[](https://gitter.im/angel_dart/discussion)
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[](https://github.com/dart-backend/angel/tree/master/packages/shelf/LICENSE)
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**Replacement of `package:angel_shelf` with breaking changes to support NNBD.**
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Shelf interop with Angel3. This package lets you run `package:shelf` handlers via a custom adapter. Use the code in this repo to embed existing Angel/shelf apps into other Angel/shelf applications. This way, you can migrate legacy applications without having to rewrite your business logic. This will make it easy to layer your API over a production application, rather than having to port code.
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- [Angel3 Shelf](#angel3-shelf)
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- [Usage](#usage)
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- [embedShelf](#embedshelf)
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- [Communicating with Angel with embedShelf](#communicating-with-angel-with-embedshelf)
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- [AngelShelf](#angelshelf)
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## Usage
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### embedShelf
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This is a compliant `shelf` adapter that acts as an Angel request handler. You can use it as a middleware,
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or attach it to individual routes.
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```dart
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import 'dart:io';
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import 'package:angel3_framework/angel3_framework.dart';
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import 'package:angel3_shelf/angel3_shelf.dart';
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import 'package:shelf/shelf.dart' as shelf;
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import 'api/api.dart';
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void main() async {
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var app = Angel();
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var http = AngelHttp(app);
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// Angel routes on top
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await app.mountController<ApiController>();
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// Re-route all other traffic to an
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// existing application.
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app.fallback(embedShelf(
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shelf.Pipeline()
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.addMiddleware(shelf.logRequests())
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.addHandler(_echoRequest)
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));
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// Or, only on a specific route:
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app.get('/shelf', wrappedShelfHandler);
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await http.startServer(InternetAddress.loopbackIPV4, 3000);
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print(http.uri);
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}
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```
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### Communicating with Angel with embedShelf
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You can communicate with Angel3:
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```dart
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handleRequest(shelf.Request request) {
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// Access original Angel request...
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var req = request.context['angel_shelf.request'] as RequestContext;
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// ... And then interact with it.
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req.container.registerNamedSingleton<Foo>('from_shelf', Foo());
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// `req.container` is also available.
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var container = request.context['angel_shelf.container'] as Container;
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container.make<Truck>().drive();
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}
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```
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### AngelShelf
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Angel3 brought about the generic `Driver` class, which is implemented by `AngelHttp`, `AngelHttp2`, `AngelGopher`, etc., and provides the core infrastructure for request handling in Angel. `AngelShelf` is an implementation that wraps shelf requests and responses in their Angel equivalents. Using it is as simple using as using `AngelHttp`, or any other driver:
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```dart
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// Create an AngelShelf driver.
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// If we have startup hooks we want to run, we need to call
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// `startServer`. Otherwise, it can be omitted.
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// Of course, if you call `startServer`, know that to run
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// shutdown/cleanup logic, you need to call `close` eventually,
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// too.
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var angelShelf = AngelShelf(app);
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await angelShelf.startServer();
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await shelf_io.serve(angelShelf.handler, InternetAddress.loopbackIPv4, 8081);
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```
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You can also use the `AngelShelf` driver as a shelf middleware - just use
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`angelShelf.middleware` instead of `angelShelf.handler`. When used as a middleware,
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if the Angel response context is still open after all handlers run (i.e. no routes were
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matched), the next shelf handler will be called.
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```dart
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var handler = shelf.Pipeline()
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.addMiddleware(angelShelf.middleware)
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.addHandler(createStaticHandler(...));
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```
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