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| 1 | +import 'dart:convert'; |
| 2 | +import 'dart:io'; |
| 3 | +import 'dart:isolate'; |
| 4 | +import 'dart:typed_data'; |
| 5 | + |
| 6 | +import 'package:relic/io_adapter.dart'; |
| 7 | +import 'package:relic/relic.dart'; |
| 8 | + |
| 9 | +void main() async { |
| 10 | + /// Number of [Isolate]s to spawn |
| 11 | + /// This is based on the number of available processors |
| 12 | + /// minus one for the main isolate |
| 13 | + final isolateCount = Platform.numberOfProcessors * 2 - 1; |
| 14 | + |
| 15 | + /// Create an [Isolate] containing an [HttpServer] |
| 16 | + await Future.wait( |
| 17 | + List.generate( |
| 18 | + isolateCount, |
| 19 | + (final index) => |
| 20 | + Isolate.spawn((final _) => _serve(), null, debugName: '$index'), |
| 21 | + ), |
| 22 | + ); |
| 23 | + |
| 24 | + _serve(); |
| 25 | +} |
| 26 | + |
| 27 | +/// [_serve] is called in each spawned isolate. |
| 28 | +Future<void> _serve() async { |
| 29 | + final router = Router<Handler>() |
| 30 | + ..get('/json', respondWith((req) => _responseJson())) |
| 31 | + ..get('/plaintext', respondWith((req) => _responsePlainText())); |
| 32 | + |
| 33 | + final handler = const Pipeline() |
| 34 | + .addMiddleware(_requiredHeadersMiddleware()) |
| 35 | + .addMiddleware(routeWith(router)) |
| 36 | + .addHandler(respondWith((_) => Response.notFound())); |
| 37 | + |
| 38 | + // start the server |
| 39 | + await serve(handler, InternetAddress.anyIPv4, 8080, shared: true); |
| 40 | +} |
| 41 | + |
| 42 | +Middleware _requiredHeadersMiddleware() { |
| 43 | + var addHeaders = createMiddleware( |
| 44 | + onResponse: (response) => response.copyWith( |
| 45 | + headers: response.headers.transform((headers) { |
| 46 | + headers.server = 'relic'; |
| 47 | + // Date header is added by default, but we set it here for clarity. |
| 48 | + headers.date = DateTime.now(); |
| 49 | + }), |
| 50 | + ), |
| 51 | + ); |
| 52 | + return addHeaders; |
| 53 | +} |
| 54 | + |
| 55 | +Response _responseJson() { |
| 56 | + return Response.ok( |
| 57 | + body: Body.fromData( |
| 58 | + _jsonEncoder.convert(const {'message': 'Hello, World!'}) as Uint8List, |
| 59 | + mimeType: MimeType.json, |
| 60 | + ), |
| 61 | + ); |
| 62 | +} |
| 63 | + |
| 64 | +Response _responsePlainText() { |
| 65 | + return Response.ok( |
| 66 | + body: Body.fromString('Hello, World!', mimeType: MimeType.plainText), |
| 67 | + ); |
| 68 | +} |
| 69 | + |
| 70 | +final _jsonEncoder = JsonUtf8Encoder(); |
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