dbus/test_service.cc

   1 // Copyright 2012 The Chromium Authors
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "dbus/test_service.h"
   6
   7 #include <stdint.h>
   8 #include <string>
   9 #include <utility>
  10 #include <vector>
  11
  12 #include "base/functional/bind.h"
  13 #include "base/functional/callback_helpers.h"
  14 #include "base/logging.h"
  15 #include "base/message_loop/message_pump_type.h"
  16 #include "base/run_loop.h"
  17 #include "base/task/single_thread_task_runner.h"
  18 #include "base/test/test_timeouts.h"
  19 #include "base/threading/platform_thread.h"
  20 #include "base/time/time.h"
  21 #include "base/uuid.h"
  22 #include "dbus/bus.h"
  23 #include "dbus/exported_object.h"
  24 #include "dbus/message.h"
  25 #include "dbus/object_manager.h"
  26 #include "dbus/object_path.h"
  27 #include "dbus/property.h"
  28
  29 namespace dbus {
  30
  31 // Echo, SlowEcho, AsyncEcho, BrokenMethod, GetAll, Get, Set, PerformAction,
  32 // GetManagedObjects
  33 const int TestService::kNumMethodsToExport = 9;
  34
  35 TestService::Options::Options()
  36     : request_ownership_options(Bus::REQUIRE_PRIMARY) {
  37 }
  38
  39 TestService::Options::~Options() = default;
  40
  41 TestService::TestService(const Options& options)
  42     : base::Thread("TestService"),
  43       service_name_(options.service_name),
  44       request_ownership_options_(options.request_ownership_options),
  45       dbus_task_runner_(options.dbus_task_runner),
  46       on_name_obtained_(base::WaitableEvent::ResetPolicy::AUTOMATIC,
  47                         base::WaitableEvent::InitialState::NOT_SIGNALED),
  48       num_exported_methods_(0),
  49       send_immediate_properties_changed_(false),
  50       has_ownership_(false),
  51       exported_object_(nullptr),
  52       exported_object_manager_(nullptr) {
  53   if (service_name_.empty()) {
  54     service_name_ = "org.chromium.TestService-" +
  55                     base::Uuid::GenerateRandomV4().AsLowercaseString();
  56   }
  57 }
  58
  59 TestService::~TestService() {
  60   Stop();
  61 }
  62
  63 bool TestService::StartService() {
  64   base::Thread::Options thread_options;
  65   thread_options.message_pump_type = base::MessagePumpType::IO;
  66   return StartWithOptions(std::move(thread_options));
  67 }
  68
  69 void TestService::WaitUntilServiceIsStarted() {
  70   // Wait until the ownership of the service name is obtained.
  71   on_name_obtained_.Wait();
  72 }
  73
  74 void TestService::ShutdownAndBlock() {
  75   task_runner()->PostTask(FROM_HERE,
  76                           base::BindOnce(&TestService::ShutdownAndBlockInternal,
  77                                          base::Unretained(this)));
  78 }
  79
  80 bool TestService::HasDBusThread() {
  81   return bus_->HasDBusThread();
  82 }
  83
  84 void TestService::ShutdownAndBlockInternal() {
  85   if (HasDBusThread())
  86     bus_->ShutdownOnDBusThreadAndBlock();
  87   else
  88     bus_->ShutdownAndBlock();
  89 }
  90
  91 void TestService::SendTestSignal(const std::string& message) {
  92   task_runner()->PostTask(FROM_HERE,
  93                           base::BindOnce(&TestService::SendTestSignalInternal,
  94                                          base::Unretained(this), message));
  95 }
  96
  97 void TestService::SendTestSignalFromRoot(const std::string& message) {
  98   task_runner()->PostTask(
  99       FROM_HERE, base::BindOnce(&TestService::SendTestSignalFromRootInternal,
 100                                 base::Unretained(this), message));
 101 }
 102
 103 void TestService::SendTestSignalInternal(const std::string& message) {
 104   Signal signal("org.chromium.TestInterface", "Test");
 105   MessageWriter writer(&signal);
 106   writer.AppendString(message);
 107   exported_object_->SendSignal(&signal);
 108 }
 109
 110 void TestService::SendTestSignalFromRootInternal(const std::string& message) {
 111   Signal signal("org.chromium.TestInterface", "Test");
 112   MessageWriter writer(&signal);
 113   writer.AppendString(message);
 114
 115   bus_->RequestOwnership(
 116       service_name_, request_ownership_options_,
 117       base::BindOnce(&TestService::OnOwnership, base::Unretained(this),
 118                      base::DoNothing()));
 119
 120   // Use "/" just like dbus-send does.
 121   ExportedObject* root_object = bus_->GetExportedObject(ObjectPath("/"));
 122   root_object->SendSignal(&signal);
 123 }
 124
 125 void TestService::RequestOwnership(base::OnceCallback<void(bool)> callback) {
 126   task_runner()->PostTask(
 127       FROM_HERE, base::BindOnce(&TestService::RequestOwnershipInternal,
 128                                 base::Unretained(this), std::move(callback)));
 129 }
 130
 131 void TestService::RequestOwnershipInternal(
 132     base::OnceCallback<void(bool)> callback) {
 133   bus_->RequestOwnership(
 134       service_name_, request_ownership_options_,
 135       base::BindOnce(&TestService::OnOwnership, base::Unretained(this),
 136                      std::move(callback)));
 137 }
 138
 139 void TestService::OnOwnership(base::OnceCallback<void(bool)> callback,
 140                               const std::string& service_name,
 141                               bool success) {
 142   has_ownership_ = success;
 143   LOG_IF(ERROR, !success) << "Failed to own: " << service_name;
 144   std::move(callback).Run(success);
 145
 146   on_name_obtained_.Signal();
 147 }
 148
 149 void TestService::ReleaseOwnership(base::OnceClosure callback) {
 150   bus_->GetDBusTaskRunner()->PostTask(
 151       FROM_HERE, base::BindOnce(&TestService::ReleaseOwnershipInternal,
 152                                 base::Unretained(this), std::move(callback)));
 153 }
 154
 155 void TestService::ReleaseOwnershipInternal(base::OnceClosure callback) {
 156   bus_->ReleaseOwnership(service_name_);
 157   has_ownership_ = false;
 158
 159   bus_->GetOriginTaskRunner()->PostTask(FROM_HERE, std::move(callback));
 160 }
 161
 162 void TestService::SetSendImmediatePropertiesChanged() {
 163   send_immediate_properties_changed_ = true;
 164 }
 165
 166 void TestService::OnExported(const std::string& interface_name,
 167                              const std::string& method_name,
 168                              bool success) {
 169   if (!success) {
 170     LOG(ERROR) << "Failed to export: " << interface_name << "."
 171                << method_name;
 172     // Returning here will make WaitUntilServiceIsStarted() to time out
 173     // and return false.
 174     return;
 175   }
 176
 177   ++num_exported_methods_;
 178   if (num_exported_methods_ == kNumMethodsToExport) {
 179     // As documented in exported_object.h, the service name should be
 180     // requested after all methods are exposed.
 181     bus_->RequestOwnership(
 182         service_name_, request_ownership_options_,
 183         base::BindOnce(&TestService::OnOwnership, base::Unretained(this),
 184                        base::DoNothing()));
 185   }
 186 }
 187
 188 void TestService::Run(base::RunLoop* run_loop) {
 189   Bus::Options bus_options;
 190   bus_options.bus_type = Bus::SESSION;
 191   bus_options.connection_type = Bus::PRIVATE;
 192   bus_options.dbus_task_runner = dbus_task_runner_;
 193   bus_ = new Bus(bus_options);
 194
 195   exported_object_ = bus_->GetExportedObject(
 196       ObjectPath("/org/chromium/TestObject"));
 197
 198   int num_methods = 0;
 199   exported_object_->ExportMethod(
 200       "org.chromium.TestInterface", "Echo",
 201       base::BindRepeating(&TestService::Echo, base::Unretained(this)),
 202       base::BindOnce(&TestService::OnExported, base::Unretained(this)));
 203   ++num_methods;
 204
 205   exported_object_->ExportMethod(
 206       "org.chromium.TestInterface", "SlowEcho",
 207       base::BindRepeating(&TestService::SlowEcho, base::Unretained(this)),
 208       base::BindOnce(&TestService::OnExported, base::Unretained(this)));
 209   ++num_methods;
 210
 211   exported_object_->ExportMethod(
 212       "org.chromium.TestInterface", "AsyncEcho",
 213       base::BindRepeating(&TestService::AsyncEcho, base::Unretained(this)),
 214       base::BindOnce(&TestService::OnExported, base::Unretained(this)));
 215   ++num_methods;
 216
 217   exported_object_->ExportMethod(
 218       "org.chromium.TestInterface", "BrokenMethod",
 219       base::BindRepeating(&TestService::BrokenMethod, base::Unretained(this)),
 220       base::BindOnce(&TestService::OnExported, base::Unretained(this)));
 221   ++num_methods;
 222
 223   exported_object_->ExportMethod(
 224       "org.chromium.TestInterface", "PerformAction",
 225       base::BindRepeating(&TestService::PerformAction, base::Unretained(this)),
 226       base::BindOnce(&TestService::OnExported, base::Unretained(this)));
 227   ++num_methods;
 228
 229   exported_object_->ExportMethod(
 230       kPropertiesInterface, kPropertiesGetAll,
 231       base::BindRepeating(&TestService::GetAllProperties,
 232                           base::Unretained(this)),
 233       base::BindOnce(&TestService::OnExported, base::Unretained(this)));
 234   ++num_methods;
 235
 236   exported_object_->ExportMethod(
 237       kPropertiesInterface, kPropertiesGet,
 238       base::BindRepeating(&TestService::GetProperty, base::Unretained(this)),
 239       base::BindOnce(&TestService::OnExported, base::Unretained(this)));
 240   ++num_methods;
 241
 242   exported_object_->ExportMethod(
 243       kPropertiesInterface, kPropertiesSet,
 244       base::BindRepeating(&TestService::SetProperty, base::Unretained(this)),
 245       base::BindOnce(&TestService::OnExported, base::Unretained(this)));
 246   ++num_methods;
 247
 248   exported_object_manager_ = bus_->GetExportedObject(
 249       ObjectPath("/org/chromium/TestService"));
 250
 251   exported_object_manager_->ExportMethod(
 252       kObjectManagerInterface, kObjectManagerGetManagedObjects,
 253       base::BindRepeating(&TestService::GetManagedObjects,
 254                           base::Unretained(this)),
 255       base::BindOnce(&TestService::OnExported, base::Unretained(this)));
 256   ++num_methods;
 257
 258   // Just print an error message as we don't want to crash tests.
 259   // Tests will fail at a call to WaitUntilServiceIsStarted().
 260   if (num_methods != kNumMethodsToExport) {
 261     LOG(ERROR) << "The number of methods does not match";
 262   }
 263   run_loop->Run();
 264 }
 265
 266 void TestService::Echo(MethodCall* method_call,
 267                        ExportedObject::ResponseSender response_sender) {
 268   MessageReader reader(method_call);
 269   std::string text_message;
 270   if (!reader.PopString(&text_message)) {
 271     std::move(response_sender).Run(std::unique_ptr<Response>());
 272     return;
 273   }
 274
 275   std::unique_ptr<Response> response = Response::FromMethodCall(method_call);
 276   MessageWriter writer(response.get());
 277   writer.AppendString(text_message);
 278   std::move(response_sender).Run(std::move(response));
 279 }
 280
 281 void TestService::SlowEcho(MethodCall* method_call,
 282                            ExportedObject::ResponseSender response_sender) {
 283   base::PlatformThread::Sleep(TestTimeouts::tiny_timeout());
 284   Echo(method_call, std::move(response_sender));
 285 }
 286
 287 void TestService::AsyncEcho(MethodCall* method_call,
 288                             ExportedObject::ResponseSender response_sender) {
 289   // Schedule a call to Echo() to send an asynchronous response after we return.
 290   task_runner()->PostDelayedTask(
 291       FROM_HERE,
 292       base::BindOnce(&TestService::Echo, base::Unretained(this), method_call,
 293                      std::move(response_sender)),
 294       TestTimeouts::tiny_timeout());
 295 }
 296
 297 void TestService::BrokenMethod(MethodCall* method_call,
 298                                ExportedObject::ResponseSender response_sender) {
 299   std::move(response_sender).Run(std::unique_ptr<Response>());
 300 }
 301
 302
 303 void TestService::GetAllProperties(
 304     MethodCall* method_call,
 305     ExportedObject::ResponseSender response_sender) {
 306   MessageReader reader(method_call);
 307   std::string interface;
 308   if (!reader.PopString(&interface)) {
 309     std::move(response_sender).Run(std::unique_ptr<Response>());
 310     return;
 311   }
 312
 313   std::unique_ptr<Response> response = Response::FromMethodCall(method_call);
 314   MessageWriter writer(response.get());
 315
 316   AddPropertiesToWriter(&writer);
 317
 318   std::move(response_sender).Run(std::move(response));
 319 }
 320
 321 void TestService::GetProperty(MethodCall* method_call,
 322                               ExportedObject::ResponseSender response_sender) {
 323   MessageReader reader(method_call);
 324   std::string interface;
 325   if (!reader.PopString(&interface)) {
 326     std::move(response_sender).Run(std::unique_ptr<Response>());
 327     return;
 328   }
 329
 330   std::string name;
 331   if (!reader.PopString(&name)) {
 332     std::move(response_sender).Run(std::unique_ptr<Response>());
 333     return;
 334   }
 335
 336   if (name == "Name") {
 337     // Return the previous value for the "Name" property:
 338     // Variant<"TestService">
 339     std::unique_ptr<Response> response = Response::FromMethodCall(method_call);
 340     MessageWriter writer(response.get());
 341
 342     writer.AppendVariantOfString("TestService");
 343
 344     std::move(response_sender).Run(std::move(response));
 345   } else if (name == "Version") {
 346     // Return a new value for the "Version" property:
 347     // Variant<20>
 348     std::unique_ptr<Response> response = Response::FromMethodCall(method_call);
 349     MessageWriter writer(response.get());
 350
 351     writer.AppendVariantOfInt16(20);
 352
 353     std::move(response_sender).Run(std::move(response));
 354   } else if (name == "Methods") {
 355     // Return the previous value for the "Methods" property:
 356     // Variant<["Echo", "SlowEcho", "AsyncEcho", "BrokenMethod"]>
 357     std::unique_ptr<Response> response = Response::FromMethodCall(method_call);
 358     MessageWriter writer(response.get());
 359     MessageWriter variant_writer(nullptr);
 360     MessageWriter variant_array_writer(nullptr);
 361
 362     writer.OpenVariant("as", &variant_writer);
 363     variant_writer.OpenArray("s", &variant_array_writer);
 364     variant_array_writer.AppendString("Echo");
 365     variant_array_writer.AppendString("SlowEcho");
 366     variant_array_writer.AppendString("AsyncEcho");
 367     variant_array_writer.AppendString("BrokenMethod");
 368     variant_writer.CloseContainer(&variant_array_writer);
 369     writer.CloseContainer(&variant_writer);
 370
 371     std::move(response_sender).Run(std::move(response));
 372   } else if (name == "Objects") {
 373     // Return the previous value for the "Objects" property:
 374     // Variant<[objectpath:"/TestObjectPath"]>
 375     std::unique_ptr<Response> response = Response::FromMethodCall(method_call);
 376     MessageWriter writer(response.get());
 377     MessageWriter variant_writer(nullptr);
 378     MessageWriter variant_array_writer(nullptr);
 379
 380     writer.OpenVariant("ao", &variant_writer);
 381     variant_writer.OpenArray("o", &variant_array_writer);
 382     variant_array_writer.AppendObjectPath(ObjectPath("/TestObjectPath"));
 383     variant_writer.CloseContainer(&variant_array_writer);
 384     writer.CloseContainer(&variant_writer);
 385
 386     std::move(response_sender).Run(std::move(response));
 387   } else if (name == "Bytes") {
 388     // Return the previous value for the "Bytes" property:
 389     // Variant<[0x54, 0x65, 0x73, 0x74]>
 390     std::unique_ptr<Response> response = Response::FromMethodCall(method_call);
 391     MessageWriter writer(response.get());
 392     MessageWriter variant_writer(nullptr);
 393     MessageWriter variant_array_writer(nullptr);
 394
 395     writer.OpenVariant("ay", &variant_writer);
 396     const uint8_t bytes[] = {0x54, 0x65, 0x73, 0x74};
 397     variant_writer.AppendArrayOfBytes(bytes, sizeof(bytes));
 398     writer.CloseContainer(&variant_writer);
 399
 400     std::move(response_sender).Run(std::move(response));
 401   } else {
 402     // Return error.
 403     std::move(response_sender).Run(std::unique_ptr<Response>());
 404     return;
 405   }
 406 }
 407
 408 void TestService::SetProperty(MethodCall* method_call,
 409                               ExportedObject::ResponseSender response_sender) {
 410   MessageReader reader(method_call);
 411   std::string interface;
 412   if (!reader.PopString(&interface)) {
 413     std::move(response_sender).Run(std::unique_ptr<Response>());
 414     return;
 415   }
 416
 417   std::string name;
 418   if (!reader.PopString(&name)) {
 419     std::move(response_sender).Run(std::unique_ptr<Response>());
 420     return;
 421   }
 422
 423   if (name != "Name") {
 424     std::move(response_sender).Run(std::unique_ptr<Response>());
 425     return;
 426   }
 427
 428   std::string value;
 429   if (!reader.PopVariantOfString(&value)) {
 430     std::move(response_sender).Run(std::unique_ptr<Response>());
 431     return;
 432   }
 433
 434   SendPropertyChangedSignal(value);
 435
 436   std::move(response_sender).Run(Response::FromMethodCall(method_call));
 437 }
 438
 439 void TestService::PerformAction(
 440       MethodCall* method_call,
 441       ExportedObject::ResponseSender response_sender) {
 442   MessageReader reader(method_call);
 443   std::string action;
 444   ObjectPath object_path;
 445   if (!reader.PopString(&action) || !reader.PopObjectPath(&object_path)) {
 446     std::move(response_sender).Run(std::unique_ptr<Response>());
 447     return;
 448   }
 449
 450   if (action == "AddObject") {
 451     AddObject(object_path);
 452   } else if (action == "RemoveObject") {
 453     RemoveObject(object_path);
 454   } else if (action == "SetSendImmediatePropertiesChanged") {
 455     SetSendImmediatePropertiesChanged();
 456   } else if (action == "ReleaseOwnership") {
 457     ReleaseOwnership(base::BindOnce(&TestService::PerformActionResponse,
 458                                     base::Unretained(this), method_call,
 459                                     std::move(response_sender)));
 460     return;
 461   } else if (action == "Ownership") {
 462     ReleaseOwnership(base::BindOnce(&TestService::OwnershipReleased,
 463                                     base::Unretained(this), method_call,
 464                                     std::move(response_sender)));
 465     return;
 466   } else if (action == "InvalidateProperty") {
 467     SendPropertyInvalidatedSignal();
 468   }
 469
 470   std::unique_ptr<Response> response = Response::FromMethodCall(method_call);
 471   std::move(response_sender).Run(std::move(response));
 472 }
 473
 474 void TestService::PerformActionResponse(
 475     MethodCall* method_call,
 476     ExportedObject::ResponseSender response_sender) {
 477   std::unique_ptr<Response> response = Response::FromMethodCall(method_call);
 478   std::move(response_sender).Run(std::move(response));
 479 }
 480
 481 void TestService::OwnershipReleased(
 482     MethodCall* method_call,
 483     ExportedObject::ResponseSender response_sender) {
 484   RequestOwnership(base::BindOnce(&TestService::OwnershipRegained,
 485                                   base::Unretained(this), method_call,
 486                                   std::move(response_sender)));
 487 }
 488
 489
 490 void TestService::OwnershipRegained(
 491     MethodCall* method_call,
 492     ExportedObject::ResponseSender response_sender,
 493     bool success) {
 494   PerformActionResponse(method_call, std::move(response_sender));
 495 }
 496
 497
 498 void TestService::GetManagedObjects(
 499     MethodCall* method_call,
 500     ExportedObject::ResponseSender response_sender) {
 501   std::unique_ptr<Response> response = Response::FromMethodCall(method_call);
 502   MessageWriter writer(response.get());
 503
 504   // The managed objects response is a dictionary of object paths identifying
 505   // the object(s) with a dictionary of strings identifying the interface(s)
 506   // they implement and then a dictionary of property values.
 507   //
 508   // Thus this looks something like:
 509   //
 510   // {
 511   //   "/org/chromium/TestObject": {
 512   //     "org.chromium.TestInterface": { /* Properties */ }
 513   //   }
 514   // }
 515
 516
 517   MessageWriter array_writer(nullptr);
 518   MessageWriter dict_entry_writer(nullptr);
 519   MessageWriter object_array_writer(nullptr);
 520   MessageWriter object_dict_entry_writer(nullptr);
 521
 522   writer.OpenArray("{oa{sa{sv}}}", &array_writer);
 523
 524   array_writer.OpenDictEntry(&dict_entry_writer);
 525   dict_entry_writer.AppendObjectPath(ObjectPath("/org/chromium/TestObject"));
 526   dict_entry_writer.OpenArray("{sa{sv}}", &object_array_writer);
 527
 528   object_array_writer.OpenDictEntry(&object_dict_entry_writer);
 529   object_dict_entry_writer.AppendString("org.chromium.TestInterface");
 530   AddPropertiesToWriter(&object_dict_entry_writer);
 531   object_array_writer.CloseContainer(&object_dict_entry_writer);
 532
 533   dict_entry_writer.CloseContainer(&object_array_writer);
 534
 535   array_writer.CloseContainer(&dict_entry_writer);
 536   writer.CloseContainer(&array_writer);
 537
 538   std::move(response_sender).Run(std::move(response));
 539
 540   if (send_immediate_properties_changed_)
 541     SendPropertyChangedSignal("ChangedTestServiceName");
 542 }
 543
 544 void TestService::AddPropertiesToWriter(MessageWriter* writer) {
 545   // The properties response is a dictionary of strings identifying the
 546   // property and a variant containing the property value. We return all
 547   // of the properties, thus the response is:
 548   //
 549   // {
 550   //   "Name": Variant<"TestService">,
 551   //   "Version": Variant<10>,
 552   //   "Methods": Variant<["Echo", "SlowEcho", "AsyncEcho", "BrokenMethod"]>,
 553   //   "Objects": Variant<[objectpath:"/TestObjectPath"]>
 554   //   "Bytes": Variant<[0x54, 0x65, 0x73, 0x74]>
 555   // }
 556
 557   MessageWriter array_writer(nullptr);
 558   MessageWriter dict_entry_writer(nullptr);
 559   MessageWriter variant_writer(nullptr);
 560   MessageWriter variant_array_writer(nullptr);
 561
 562   writer->OpenArray("{sv}", &array_writer);
 563
 564   array_writer.OpenDictEntry(&dict_entry_writer);
 565   dict_entry_writer.AppendString("Name");
 566   dict_entry_writer.AppendVariantOfString("TestService");
 567   array_writer.CloseContainer(&dict_entry_writer);
 568
 569   array_writer.OpenDictEntry(&dict_entry_writer);
 570   dict_entry_writer.AppendString("Version");
 571   dict_entry_writer.AppendVariantOfInt16(10);
 572   array_writer.CloseContainer(&dict_entry_writer);
 573
 574   array_writer.OpenDictEntry(&dict_entry_writer);
 575   dict_entry_writer.AppendString("Methods");
 576   dict_entry_writer.OpenVariant("as", &variant_writer);
 577   variant_writer.OpenArray("s", &variant_array_writer);
 578   variant_array_writer.AppendString("Echo");
 579   variant_array_writer.AppendString("SlowEcho");
 580   variant_array_writer.AppendString("AsyncEcho");
 581   variant_array_writer.AppendString("BrokenMethod");
 582   variant_writer.CloseContainer(&variant_array_writer);
 583   dict_entry_writer.CloseContainer(&variant_writer);
 584   array_writer.CloseContainer(&dict_entry_writer);
 585
 586   array_writer.OpenDictEntry(&dict_entry_writer);
 587   dict_entry_writer.AppendString("Objects");
 588   dict_entry_writer.OpenVariant("ao", &variant_writer);
 589   variant_writer.OpenArray("o", &variant_array_writer);
 590   variant_array_writer.AppendObjectPath(ObjectPath("/TestObjectPath"));
 591   variant_writer.CloseContainer(&variant_array_writer);
 592   dict_entry_writer.CloseContainer(&variant_writer);
 593   array_writer.CloseContainer(&dict_entry_writer);
 594
 595   array_writer.OpenDictEntry(&dict_entry_writer);
 596   dict_entry_writer.AppendString("Bytes");
 597   dict_entry_writer.OpenVariant("ay", &variant_writer);
 598   const uint8_t bytes[] = {0x54, 0x65, 0x73, 0x74};
 599   variant_writer.AppendArrayOfBytes(bytes, sizeof(bytes));
 600   dict_entry_writer.CloseContainer(&variant_writer);
 601   array_writer.CloseContainer(&dict_entry_writer);
 602
 603   writer->CloseContainer(&array_writer);
 604 }
 605
 606 void TestService::AddObject(const ObjectPath& object_path) {
 607   task_runner()->PostTask(FROM_HERE,
 608                           base::BindOnce(&TestService::AddObjectInternal,
 609                                          base::Unretained(this), object_path));
 610 }
 611
 612 void TestService::AddObjectInternal(const ObjectPath& object_path) {
 613   Signal signal(kObjectManagerInterface, kObjectManagerInterfacesAdded);
 614   MessageWriter writer(&signal);
 615   writer.AppendObjectPath(object_path);
 616
 617   MessageWriter array_writer(nullptr);
 618   MessageWriter dict_entry_writer(nullptr);
 619
 620   writer.OpenArray("{sa{sv}}", &array_writer);
 621   array_writer.OpenDictEntry(&dict_entry_writer);
 622   dict_entry_writer.AppendString("org.chromium.TestInterface");
 623   AddPropertiesToWriter(&dict_entry_writer);
 624   array_writer.CloseContainer(&dict_entry_writer);
 625   writer.CloseContainer(&array_writer);
 626
 627   exported_object_manager_->SendSignal(&signal);
 628 }
 629
 630 void TestService::RemoveObject(const ObjectPath& object_path) {
 631   task_runner()->PostTask(FROM_HERE,
 632                           base::BindOnce(&TestService::RemoveObjectInternal,
 633                                          base::Unretained(this), object_path));
 634 }
 635
 636 void TestService::RemoveObjectInternal(const ObjectPath& object_path) {
 637   Signal signal(kObjectManagerInterface, kObjectManagerInterfacesRemoved);
 638   MessageWriter writer(&signal);
 639
 640   writer.AppendObjectPath(object_path);
 641
 642   std::vector<std::string> interfaces;
 643   interfaces.push_back("org.chromium.TestInterface");
 644   writer.AppendArrayOfStrings(interfaces);
 645
 646   exported_object_manager_->SendSignal(&signal);
 647 }
 648
 649 void TestService::SendPropertyChangedSignal(const std::string& name) {
 650   task_runner()->PostTask(
 651       FROM_HERE, base::BindOnce(&TestService::SendPropertyChangedSignalInternal,
 652                                 base::Unretained(this), name));
 653 }
 654
 655 void TestService::SendPropertyChangedSignalInternal(const std::string& name) {
 656   Signal signal(kPropertiesInterface, kPropertiesChanged);
 657   MessageWriter writer(&signal);
 658   writer.AppendString("org.chromium.TestInterface");
 659
 660   MessageWriter array_writer(nullptr);
 661   MessageWriter dict_entry_writer(nullptr);
 662
 663   writer.OpenArray("{sv}", &array_writer);
 664   array_writer.OpenDictEntry(&dict_entry_writer);
 665   dict_entry_writer.AppendString("Name");
 666   dict_entry_writer.AppendVariantOfString(name);
 667   array_writer.CloseContainer(&dict_entry_writer);
 668   writer.CloseContainer(&array_writer);
 669
 670   MessageWriter invalidated_array_writer(nullptr);
 671
 672   writer.OpenArray("s", &invalidated_array_writer);
 673   writer.CloseContainer(&invalidated_array_writer);
 674
 675   exported_object_->SendSignal(&signal);
 676 }
 677
 678 void TestService::SendPropertyInvalidatedSignal() {
 679   task_runner()->PostTask(
 680       FROM_HERE,
 681       base::BindOnce(&TestService::SendPropertyInvalidatedSignalInternal,
 682                      base::Unretained(this)));
 683 }
 684
 685 void TestService::SendPropertyInvalidatedSignalInternal() {
 686   Signal signal(kPropertiesInterface, kPropertiesChanged);
 687   MessageWriter writer(&signal);
 688   writer.AppendString("org.chromium.TestInterface");
 689
 690   MessageWriter array_writer(nullptr);
 691   MessageWriter dict_entry_writer(nullptr);
 692
 693   writer.OpenArray("{sv}", &array_writer);
 694   writer.CloseContainer(&array_writer);
 695
 696   MessageWriter invalidated_array_writer(nullptr);
 697
 698   writer.OpenArray("s", &invalidated_array_writer);
 699   invalidated_array_writer.AppendString("Name");
 700   writer.CloseContainer(&invalidated_array_writer);
 701
 702   exported_object_->SendSignal(&signal);
 703 }
 704
 705 }  // namespace dbus