Introduced support for external services registration in the ServiceProtocol

runtime/observatory/tests/service/external_service_registration_via_notification_test.dart

+// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+// VMOptions=--error_on_bad_type --error_on_bad_override
+
+import 'package:observatory/service_io.dart';
+import 'package:unittest/unittest.dart';
+import 'test_helper.dart';
+import 'dart:io' show WebSocket;
+import 'dart:convert' show JSON;
+import 'dart:async' show Future, StreamController;
+
+var tests = [
+  (Isolate isolate) async {
+    VM vm = isolate.owner;
+
+    final serviceEvents =
+        (await vm.getEventStream('_Service')).asBroadcastStream();
+
+    expect(vm.services, isEmpty,
+        reason: 'No service should be registered at startup');
+
+    WebSocket _socket =
+        await WebSocket.connect((vm as WebSocketVM).target.networkAddress);
+
+    final socket = new StreamController();
+
+    // Avoid to manually encode and decode messages from the stream
+    socket.stream.map(JSON.encode).pipe(_socket);
+    final client = _socket.map(JSON.decode).asBroadcastStream();
+
+    // Note: keep this in sync with sdk/lib/vmservice.dart
+    const kServiceAlreadyRegistered = 110;
+    const kServiceAlreadyRegistered_Msg = 'Service already registered';
+
+    const serviceName = 'serviceName';
+    const serviceAlias = 'serviceAlias';
+
+    {
+      // Registering first service
+      socket.add({
+        'jsonrpc': '2.0',
+        'method': '_registerService',
+        'params': {'service': serviceName, 'alias': serviceAlias}
+      });
+
+      await serviceEvents.first;
+
+      expect(vm.services, isNotEmpty);
+      expect(vm.services.length, equals(1));
+      expect(vm.services.first.service, equals(serviceName));
+      expect(vm.services.first.method, isNotEmpty);
+      expect(vm.services.first.alias, equals(serviceAlias));
+    }
+
+    {
+      // Registering second service
+      socket.add({
+        'jsonrpc': '2.0',
+        'method': '_registerService',
+        'params': {'service': serviceName + '2', 'alias': serviceAlias + '2'}
+      });
+
+      await serviceEvents.first;
+
+      expect(vm.services, isNotEmpty);
+      expect(vm.services.length, equals(2));
+      expect(vm.services[1].service, equals(serviceName + '2'));
+      expect(vm.services[1].method, isNotEmpty);
+      expect(vm.services[1].alias, equals(serviceAlias + '2'));
+    }
+
+    {
+      // Double registering first service
+      socket.add({
+        'jsonrpc': '2.0',
+        'id': 1,
+        'method': '_registerService',
+        'params': {'service': serviceName, 'alias': serviceAlias}
+      });
+
+      final message = await client.first;
+
+      expect(message['id'], equals(1),
+          reason: 'Should answer with the same id');
+      expect(message['error'], isNotEmpty);
+      expect(message['error']['code'], equals(kServiceAlreadyRegistered));
+      expect(
+          message['error']['message'], equals(kServiceAlreadyRegistered_Msg));
+    }
+
+    // Avoid flaky test.
+    // We cannot assume the order in which two messages will arrive
+    // from two different sockets
+    await Future.wait([socket.close(), serviceEvents.take(2).last]);
+
+    expect(vm.services, isEmpty,
+        reason: 'Should unregister services when client disconnects');
+  },
+];
+
+main(args) => runIsolateTests(args, tests);