68 lines
2.1 KiB
Dart
68 lines
2.1 KiB
Dart
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#!/usr/bin/env dart
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/// Most Angel applications will not need to use the load balancer.
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/// Instead, you can start up a multi-threaded cluster.
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library angel.scaled_server;
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import 'dart:io';
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import 'dart:isolate';
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import 'package:angel_compress/angel_compress.dart';
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import 'package:angel_multiserver/angel_multiserver.dart';
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import 'package:angel/angel.dart';
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/// The number of isolates to spawn. You might consider starting one instance
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/// per processor core on your machine.
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final int nInstances = Platform.numberOfProcessors;
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main() {
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var startupPort = new ReceivePort();
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List<String> startupMessages = [];
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// Start up multiple instances of our application.
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for (int i = 0; i < nInstances; i++) {
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Isolate.spawn(isolateMain, [i, startupPort.sendPort]);
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}
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int nStarted = 0;
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// Listen for notifications of application startup...
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startupPort.listen((String startupMessage) {
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startupMessages.add(startupMessage);
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if (++nStarted == nInstances) {
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// Keep track of how many instances successfully started up,
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// and print a success message when they all boot.
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startupMessages.forEach(print);
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print('Spawned $nInstances instance(s) of Angel.');
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}
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});
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}
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void isolateMain(List args) {
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int instanceId = args[0];
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SendPort startupPort = args[1];
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createServer().then((app) async {
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// Response compression via GZIP.
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//
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// See the documentation here:
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// https://github.com/angel-dart/compress
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app.responseFinalizers.add(gzip());
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// Cache static assets - just to lower response time.
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//
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// See the documentation here:
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// https://github.com/angel-dart/multiserver
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//
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// Here is an example of response caching:
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// https://github.com/angel-dart/multiserver/blob/master/example/cache.dart
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await app.configure(cacheResponses(filters: [new RegExp(r'images/\.*')]));
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var server = await app.startServer(
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InternetAddress.ANY_IP_V4, app.properties['port'] ?? 3000);
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// Send a notification back to the main isolate
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startupPort.send('Instance #$instanceId listening at http://${server.address.address}:${server.port}');
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});
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}
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