Introduced support for external services registration in the ServiceProtocol

runtime/observatory/tests/service/external_service_synchronous_invocation_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();
+
+    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();
+
+    const successServiceName = 'successService';
+    const errorServiceName = 'errorService';
+    const serviceAlias = 'serviceAlias';
+    const paramKey = 'pkey';
+    const paramValue = 'pvalue';
+    const resultKey = 'rkey';
+    const resultValue = 'rvalue';
+    const errorCode = 5000;
+    const errorKey = 'ekey';
+    const errorValue = 'evalue';
+    const repetition = 5;
+
+    socket.add({
+      'jsonrpc': '2.0',
+      'id': 1,
+      'method': '_registerService',
+      'params': {'service': successServiceName, 'alias': serviceAlias}
+    });
+
+    // Avoid flaky test.
+    // We cannot assume the order in which two messages will arrive
+    // from two different sockets
+    await Future.wait([client.first, serviceEvents.first]);
+
+    // Registering second service
+    socket.add({
+      'jsonrpc': '2.0',
+      'id': 1,
+      'method': '_registerService',
+      'params': {'service': errorServiceName, 'alias': serviceAlias}
+    });
+
+    // Avoid flaky test.
+    // We cannot assume the order in which two messages will arrive
+    // from two different sockets
+    await Future.wait([client.first, serviceEvents.first]);
+
+    // Testing serial invocation of service which succeeds
+    for (var iteration = 0; iteration < repetition; iteration++) {
+      final end = iteration.toString();
+      final result = vm.invokeRpcRaw(
+          vm.services.first.method, {paramKey + end: paramValue + end});
+      final request = await client.first;
+
+      expect(request, contains('id'));
+      expect(request['id'], isNotNull);
+      expect(request['method'], equals(successServiceName));
+      expect(request['params'], isNotNull);
+      expect(request['params'][paramKey + end], equals(paramValue + end));
+
+      socket.add({
+        'jsonrpc': '2.0',
+        'id': request['id'],
+        'result': {resultKey + end: resultValue + end}
+      });
+
+      final response = await result;
+
+      expect(response, isNotNull);
+      expect(response[resultKey + end], equals(resultValue + end));
+    }
+
+    // Testing serial invocation of service which fails
+    for (var iteration = 0; iteration < repetition; iteration++) {
+      final end = iteration.toString();
+      final result = vm.invokeRpcRaw(
+          vm.services[1].method, {paramKey + end: paramValue + end});
+      final request = await client.first;
+
+      expect(request, contains('id'));
+      expect(request['id'], isNotNull);
+      expect(request['method'], equals(errorServiceName));
+      expect(request['params'], isNotNull);
+      expect(request['params'][paramKey + end], equals(paramValue + end));
+
+      socket.add({
+        'jsonrpc': '2.0',
+        'id': request['id'],
+        'error': {
+          'code': errorCode + iteration,
+          'data': {errorKey + end: errorValue + end}
+        }
+      });
+
+      try {
+        final response = await result;
+        expect(false, isTrue, reason: 'shouldn\'t get here');
+      } on ServerRpcException catch (e) {
+        expect(e.code, equals(errorCode + iteration));
+        expect(e.data, isNotNull);
+        expect(e.data[errorKey + end], equals(errorValue + end));
+      }
+    }
+  },
+];
+
+main(args) => runIsolateTests(args, tests);