src/chrome/browser/chromeos/drive/drive_file_stream_reader_unittest.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   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 "chrome/browser/chromeos/drive/drive_file_stream_reader.h"
   6
   7 #include <string>
   8
   9 #include "base/bind.h"
  10 #include "base/files/file_path.h"
  11 #include "base/files/scoped_temp_dir.h"
  12 #include "base/run_loop.h"
  13 #include "base/threading/thread.h"
  14 #include "chrome/browser/chromeos/drive/fake_file_system.h"
  15 #include "chrome/browser/chromeos/drive/file_system_util.h"
  16 #include "chrome/browser/chromeos/drive/local_file_reader.h"
  17 #include "chrome/browser/chromeos/drive/test_util.h"
  18 #include "chrome/browser/drive/fake_drive_service.h"
  19 #include "chrome/browser/drive/test_util.h"
  20 #include "content/public/test/test_browser_thread_bundle.h"
  21 #include "content/public/test/test_utils.h"
  22 #include "google_apis/drive/drive_api_parser.h"
  23 #include "google_apis/drive/test_util.h"
  24 #include "net/base/io_buffer.h"
  25 #include "net/base/net_errors.h"
  26 #include "net/base/test_completion_callback.h"
  27 #include "net/http/http_byte_range.h"
  28 #include "testing/gtest/include/gtest/gtest.h"
  29
  30 namespace drive {
  31 namespace internal {
  32 namespace {
  33
  34 // Increments the |num_called|, when this method is invoked.
  35 void IncrementCallback(int* num_called) {
  36   DCHECK(num_called);
  37   ++*num_called;
  38 }
  39
  40 }  // namespace
  41
  42 class LocalReaderProxyTest : public ::testing::Test {
  43  protected:
  44   LocalReaderProxyTest()
  45       : thread_bundle_(content::TestBrowserThreadBundle::IO_MAINLOOP) {
  46   }
  47
  48   virtual void SetUp() OVERRIDE {
  49     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
  50     ASSERT_TRUE(google_apis::test_util::CreateFileOfSpecifiedSize(
  51         temp_dir_.path(), 1024, &file_path_, &file_content_));
  52
  53     worker_thread_.reset(new base::Thread("ReaderProxyTest"));
  54     ASSERT_TRUE(worker_thread_->Start());
  55   }
  56
  57   content::TestBrowserThreadBundle thread_bundle_;
  58
  59   base::ScopedTempDir temp_dir_;
  60   base::FilePath file_path_;
  61   std::string file_content_;
  62
  63   scoped_ptr<base::Thread> worker_thread_;
  64 };
  65
  66 TEST_F(LocalReaderProxyTest, Read) {
  67   // Open the file first.
  68   scoped_ptr<util::LocalFileReader> file_reader(
  69       new util::LocalFileReader(worker_thread_->message_loop_proxy().get()));
  70   net::TestCompletionCallback callback;
  71   file_reader->Open(file_path_, 0, callback.callback());
  72   ASSERT_EQ(net::OK, callback.WaitForResult());
  73
  74   // Test instance.
  75   LocalReaderProxy proxy(file_reader.Pass(), file_content_.size());
  76
  77   // Make sure the read content is as same as the file.
  78   std::string content;
  79   ASSERT_EQ(net::OK, test_util::ReadAllData(&proxy, &content));
  80   EXPECT_EQ(file_content_, content);
  81 }
  82
  83 TEST_F(LocalReaderProxyTest, ReadWithLimit) {
  84   // This test case, we only read first half of the file.
  85   const std::string expected_content =
  86       file_content_.substr(0, file_content_.size() / 2);
  87
  88   // Open the file first.
  89   scoped_ptr<util::LocalFileReader> file_reader(
  90       new util::LocalFileReader(worker_thread_->message_loop_proxy().get()));
  91   net::TestCompletionCallback callback;
  92   file_reader->Open(file_path_, 0, callback.callback());
  93   ASSERT_EQ(net::OK, callback.WaitForResult());
  94
  95   // Test instance.
  96   LocalReaderProxy proxy(file_reader.Pass(), expected_content.size());
  97
  98   // Make sure the read content is as same as the file.
  99   std::string content;
 100   ASSERT_EQ(net::OK, test_util::ReadAllData(&proxy, &content));
 101   EXPECT_EQ(expected_content, content);
 102 }
 103
 104 class NetworkReaderProxyTest : public ::testing::Test {
 105  protected:
 106   NetworkReaderProxyTest()
 107       : thread_bundle_(content::TestBrowserThreadBundle::IO_MAINLOOP) {
 108   }
 109
 110   content::TestBrowserThreadBundle thread_bundle_;
 111 };
 112
 113 TEST_F(NetworkReaderProxyTest, EmptyFile) {
 114   NetworkReaderProxy proxy(0, 0, 0, base::Bind(&base::DoNothing));
 115
 116   net::TestCompletionCallback callback;
 117   const int kBufferSize = 10;
 118   scoped_refptr<net::IOBuffer> buffer(new net::IOBuffer(kBufferSize));
 119   int result = proxy.Read(buffer.get(), kBufferSize, callback.callback());
 120
 121   // For empty file, Read() should return 0 immediately.
 122   EXPECT_EQ(0, result);
 123 }
 124
 125 TEST_F(NetworkReaderProxyTest, Read) {
 126   int cancel_called = 0;
 127   {
 128     NetworkReaderProxy proxy(0, 10, 10,
 129                              base::Bind(&IncrementCallback, &cancel_called));
 130
 131     net::TestCompletionCallback callback;
 132     const int kBufferSize = 3;
 133     scoped_refptr<net::IOBuffer> buffer(new net::IOBuffer(kBufferSize));
 134
 135     // If no data is available yet, ERR_IO_PENDING should be returned.
 136     int result = proxy.Read(buffer.get(), kBufferSize, callback.callback());
 137     EXPECT_EQ(net::ERR_IO_PENDING, result);
 138
 139     // And when the data is supplied, the callback will be called.
 140     scoped_ptr<std::string> data(new std::string("abcde"));
 141     proxy.OnGetContent(data.Pass());
 142
 143     // The returned data should be fit to the buffer size.
 144     result = callback.GetResult(result);
 145     EXPECT_EQ(3, result);
 146     EXPECT_EQ("abc", std::string(buffer->data(), result));
 147
 148     // The next Read should return immediately because there is pending data
 149     result = proxy.Read(buffer.get(), kBufferSize, callback.callback());
 150     EXPECT_EQ(2, result);
 151     EXPECT_EQ("de", std::string(buffer->data(), result));
 152
 153     // Supply the data before calling Read operation.
 154     data.reset(new std::string("fg"));
 155     proxy.OnGetContent(data.Pass());
 156     data.reset(new std::string("hij"));
 157     proxy.OnGetContent(data.Pass());  // Now 10 bytes are supplied.
 158
 159     // The data should be concatenated if possible.
 160     result = proxy.Read(buffer.get(), kBufferSize, callback.callback());
 161     EXPECT_EQ(3, result);
 162     EXPECT_EQ("fgh", std::string(buffer->data(), result));
 163
 164     result = proxy.Read(buffer.get(), kBufferSize, callback.callback());
 165     EXPECT_EQ(2, result);
 166     EXPECT_EQ("ij", std::string(buffer->data(), result));
 167
 168     // The whole data is read, so Read() should return 0 immediately by then.
 169     result = proxy.Read(buffer.get(), kBufferSize, callback.callback());
 170     EXPECT_EQ(0, result);
 171   }
 172
 173   // Proxy is deleted without any called to OnCompleted(). Even in the case,
 174   // cancel callback should not be invoked.
 175   EXPECT_EQ(0, cancel_called);
 176 }
 177
 178 TEST_F(NetworkReaderProxyTest, ReadWithLimit) {
 179   NetworkReaderProxy proxy(10, 10, 10, base::Bind(&base::DoNothing));
 180
 181   net::TestCompletionCallback callback;
 182   const int kBufferSize = 3;
 183   scoped_refptr<net::IOBuffer> buffer(new net::IOBuffer(kBufferSize));
 184
 185   // If no data is available yet, ERR_IO_PENDING should be returned.
 186   int result = proxy.Read(buffer.get(), kBufferSize, callback.callback());
 187   EXPECT_EQ(net::ERR_IO_PENDING, result);
 188
 189   // And when the data is supplied, the callback will be called.
 190   scoped_ptr<std::string> data(new std::string("abcde"));
 191   proxy.OnGetContent(data.Pass());
 192   data.reset(new std::string("fgh"));
 193   proxy.OnGetContent(data.Pass());
 194   data.reset(new std::string("ijklmno"));
 195   proxy.OnGetContent(data.Pass());
 196
 197   // The returned data should be fit to the buffer size.
 198   result = callback.GetResult(result);
 199   EXPECT_EQ(3, result);
 200   EXPECT_EQ("klm", std::string(buffer->data(), result));
 201
 202   // The next Read should return immediately because there is pending data
 203   result = proxy.Read(buffer.get(), kBufferSize, callback.callback());
 204   EXPECT_EQ(2, result);
 205   EXPECT_EQ("no", std::string(buffer->data(), result));
 206
 207   // Supply the data before calling Read operation.
 208   data.reset(new std::string("pqrs"));
 209   proxy.OnGetContent(data.Pass());
 210   data.reset(new std::string("tuvwxyz"));
 211   proxy.OnGetContent(data.Pass());  // 't' is the 20-th byte.
 212
 213   // The data should be concatenated if possible.
 214   result = proxy.Read(buffer.get(), kBufferSize, callback.callback());
 215   EXPECT_EQ(3, result);
 216   EXPECT_EQ("pqr", std::string(buffer->data(), result));
 217
 218   result = proxy.Read(buffer.get(), kBufferSize, callback.callback());
 219   EXPECT_EQ(2, result);
 220   EXPECT_EQ("st", std::string(buffer->data(), result));
 221
 222   // The whole data is read, so Read() should return 0 immediately by then.
 223   result = proxy.Read(buffer.get(), kBufferSize, callback.callback());
 224   EXPECT_EQ(0, result);
 225 }
 226
 227 TEST_F(NetworkReaderProxyTest, ErrorWithPendingCallback) {
 228   NetworkReaderProxy proxy(0, 10, 10, base::Bind(&base::DoNothing));
 229
 230   net::TestCompletionCallback callback;
 231   const int kBufferSize = 3;
 232   scoped_refptr<net::IOBuffer> buffer(new net::IOBuffer(kBufferSize));
 233
 234   // Set pending callback.
 235   int result = proxy.Read(buffer.get(), kBufferSize, callback.callback());
 236   EXPECT_EQ(net::ERR_IO_PENDING, result);
 237
 238   // Emulate that an error is found. The callback should be called internally.
 239   proxy.OnCompleted(FILE_ERROR_FAILED);
 240   result = callback.GetResult(result);
 241   EXPECT_EQ(net::ERR_FAILED, result);
 242
 243   // The next Read call should also return the same error code.
 244   EXPECT_EQ(net::ERR_FAILED,
 245             proxy.Read(buffer.get(), kBufferSize, callback.callback()));
 246 }
 247
 248 TEST_F(NetworkReaderProxyTest, ErrorWithPendingData) {
 249   NetworkReaderProxy proxy(0, 10, 10, base::Bind(&base::DoNothing));
 250
 251   net::TestCompletionCallback callback;
 252   const int kBufferSize = 3;
 253   scoped_refptr<net::IOBuffer> buffer(new net::IOBuffer(kBufferSize));
 254
 255   // Supply the data before an error.
 256   scoped_ptr<std::string> data(new std::string("abcde"));
 257   proxy.OnGetContent(data.Pass());
 258
 259   // Emulate that an error is found.
 260   proxy.OnCompleted(FILE_ERROR_FAILED);
 261
 262   // The next Read call should return the error code, even if there is
 263   // pending data (the pending data should be released in OnCompleted.
 264   EXPECT_EQ(net::ERR_FAILED,
 265             proxy.Read(buffer.get(), kBufferSize, callback.callback()));
 266 }
 267
 268 TEST_F(NetworkReaderProxyTest, CancelJob) {
 269   int num_called = 0;
 270   {
 271     NetworkReaderProxy proxy(
 272         0, 0, 0, base::Bind(&IncrementCallback, &num_called));
 273     proxy.OnCompleted(FILE_ERROR_OK);
 274     // Destroy the instance after the network operation is completed.
 275     // The cancelling callback shouldn't be called.
 276   }
 277   EXPECT_EQ(0, num_called);
 278
 279   num_called = 0;
 280   {
 281     NetworkReaderProxy proxy(
 282         0, 0, 0, base::Bind(&IncrementCallback, &num_called));
 283     // Destroy the instance before the network operation is completed.
 284     // The cancelling callback should be called.
 285   }
 286   EXPECT_EQ(1, num_called);
 287 }
 288
 289 }  // namespace internal
 290
 291 class DriveFileStreamReaderTest : public ::testing::Test {
 292  protected:
 293   DriveFileStreamReaderTest()
 294       : thread_bundle_(content::TestBrowserThreadBundle::IO_MAINLOOP) {
 295   }
 296
 297   virtual void SetUp() OVERRIDE {
 298     worker_thread_.reset(new base::Thread("DriveFileStreamReaderTest"));
 299     ASSERT_TRUE(worker_thread_->Start());
 300
 301     // Initialize FakeDriveService.
 302     fake_drive_service_.reset(new FakeDriveService);
 303     ASSERT_TRUE(test_util::SetUpTestEntries(fake_drive_service_.get()));
 304
 305     // Create a testee instance.
 306     fake_file_system_.reset(
 307         new test_util::FakeFileSystem(fake_drive_service_.get()));
 308   }
 309
 310   FileSystemInterface* GetFileSystem() {
 311     return fake_file_system_.get();
 312   }
 313
 314   DriveFileStreamReader::FileSystemGetter GetFileSystemGetter() {
 315     return base::Bind(&DriveFileStreamReaderTest::GetFileSystem,
 316                       base::Unretained(this));
 317   }
 318
 319   content::TestBrowserThreadBundle thread_bundle_;
 320
 321   scoped_ptr<base::Thread> worker_thread_;
 322
 323   scoped_ptr<FakeDriveService> fake_drive_service_;
 324   scoped_ptr<test_util::FakeFileSystem> fake_file_system_;
 325 };
 326
 327 TEST_F(DriveFileStreamReaderTest, Read) {
 328   const base::FilePath kDriveFile =
 329       util::GetDriveMyDriveRootPath().AppendASCII("File 1.txt");
 330   // Create the reader, and initialize it.
 331   // In this case, the file is not yet locally cached.
 332   scoped_ptr<DriveFileStreamReader> reader(new DriveFileStreamReader(
 333       GetFileSystemGetter(), worker_thread_->message_loop_proxy().get()));
 334   EXPECT_FALSE(reader->IsInitialized());
 335
 336   int error = net::ERR_FAILED;
 337   scoped_ptr<ResourceEntry> entry;
 338   {
 339     base::RunLoop run_loop;
 340     reader->Initialize(
 341         kDriveFile,
 342         net::HttpByteRange(),
 343         google_apis::test_util::CreateQuitCallback(
 344             &run_loop,
 345             google_apis::test_util::CreateCopyResultCallback(&error, &entry)));
 346     run_loop.Run();
 347   }
 348   EXPECT_EQ(net::OK, error);
 349   ASSERT_TRUE(entry);
 350   EXPECT_TRUE(reader->IsInitialized());
 351   size_t content_size = entry->file_info().size();
 352
 353   // Read data from the reader.
 354   std::string first_content;
 355   ASSERT_EQ(net::OK, test_util::ReadAllData(reader.get(), &first_content));
 356   EXPECT_EQ(content_size, first_content.size());
 357
 358   // Create second instance and initialize it.
 359   // In this case, the file should be cached one.
 360   reader.reset(new DriveFileStreamReader(
 361       GetFileSystemGetter(), worker_thread_->message_loop_proxy().get()));
 362   EXPECT_FALSE(reader->IsInitialized());
 363
 364   error = net::ERR_FAILED;
 365   entry.reset();
 366   {
 367     base::RunLoop run_loop;
 368     reader->Initialize(
 369         kDriveFile,
 370         net::HttpByteRange(),
 371         google_apis::test_util::CreateQuitCallback(
 372             &run_loop,
 373             google_apis::test_util::CreateCopyResultCallback(&error, &entry)));
 374     run_loop.Run();
 375   }
 376   EXPECT_EQ(net::OK, error);
 377   ASSERT_TRUE(entry);
 378   EXPECT_TRUE(reader->IsInitialized());
 379
 380   // The size should be same.
 381   EXPECT_EQ(content_size, static_cast<size_t>(entry->file_info().size()));
 382
 383   // Read data from the reader, again.
 384   std::string second_content;
 385   ASSERT_EQ(net::OK, test_util::ReadAllData(reader.get(), &second_content));
 386
 387   // The same content is expected.
 388   EXPECT_EQ(first_content, second_content);
 389 }
 390
 391 TEST_F(DriveFileStreamReaderTest, ReadRange) {
 392   // In this test case, we just confirm that the part of file is read.
 393   const int64 kRangeOffset = 3;
 394   const int64 kRangeLength = 4;
 395
 396   const base::FilePath kDriveFile =
 397       util::GetDriveMyDriveRootPath().AppendASCII("File 1.txt");
 398   // Create the reader, and initialize it.
 399   // In this case, the file is not yet locally cached.
 400   scoped_ptr<DriveFileStreamReader> reader(new DriveFileStreamReader(
 401       GetFileSystemGetter(), worker_thread_->message_loop_proxy().get()));
 402   EXPECT_FALSE(reader->IsInitialized());
 403
 404   int error = net::ERR_FAILED;
 405   scoped_ptr<ResourceEntry> entry;
 406   net::HttpByteRange byte_range;
 407   byte_range.set_first_byte_position(kRangeOffset);
 408   // Last byte position is inclusive.
 409   byte_range.set_last_byte_position(kRangeOffset + kRangeLength - 1);
 410   {
 411     base::RunLoop run_loop;
 412     reader->Initialize(
 413         kDriveFile,
 414         byte_range,
 415         google_apis::test_util::CreateQuitCallback(
 416             &run_loop,
 417             google_apis::test_util::CreateCopyResultCallback(&error, &entry)));
 418     run_loop.Run();
 419   }
 420   EXPECT_EQ(net::OK, error);
 421   ASSERT_TRUE(entry);
 422   EXPECT_TRUE(reader->IsInitialized());
 423
 424   // Read data from the reader.
 425   std::string first_content;
 426   ASSERT_EQ(net::OK, test_util::ReadAllData(reader.get(), &first_content));
 427
 428   // The length should be equal to range length.
 429   EXPECT_EQ(kRangeLength, static_cast<int64>(first_content.size()));
 430
 431   // Create second instance and initialize it.
 432   // In this case, the file should be cached one.
 433   reader.reset(new DriveFileStreamReader(
 434       GetFileSystemGetter(), worker_thread_->message_loop_proxy().get()));
 435   EXPECT_FALSE(reader->IsInitialized());
 436
 437   error = net::ERR_FAILED;
 438   entry.reset();
 439   {
 440     base::RunLoop run_loop;
 441     reader->Initialize(
 442         kDriveFile,
 443         byte_range,
 444         google_apis::test_util::CreateQuitCallback(
 445             &run_loop,
 446             google_apis::test_util::CreateCopyResultCallback(&error, &entry)));
 447     run_loop.Run();
 448   }
 449   EXPECT_EQ(net::OK, error);
 450   ASSERT_TRUE(entry);
 451   EXPECT_TRUE(reader->IsInitialized());
 452
 453   // Read data from the reader, again.
 454   std::string second_content;
 455   ASSERT_EQ(net::OK, test_util::ReadAllData(reader.get(), &second_content));
 456
 457   // The same content is expected.
 458   EXPECT_EQ(first_content, second_content);
 459 }
 460
 461 TEST_F(DriveFileStreamReaderTest, OutOfRangeError) {
 462   const int64 kRangeOffset = 1000000;  // Out of range.
 463   const int64 kRangeLength = 4;
 464
 465   const base::FilePath kDriveFile =
 466       util::GetDriveMyDriveRootPath().AppendASCII("File 1.txt");
 467   // Create the reader, and initialize it.
 468   // In this case, the file is not yet locally cached.
 469   scoped_ptr<DriveFileStreamReader> reader(new DriveFileStreamReader(
 470       GetFileSystemGetter(), worker_thread_->message_loop_proxy().get()));
 471   EXPECT_FALSE(reader->IsInitialized());
 472
 473   int error = net::ERR_FAILED;
 474   scoped_ptr<ResourceEntry> entry;
 475   net::HttpByteRange byte_range;
 476   byte_range.set_first_byte_position(kRangeOffset);
 477   // Last byte position is inclusive.
 478   byte_range.set_last_byte_position(kRangeOffset + kRangeLength - 1);
 479   {
 480     base::RunLoop run_loop;
 481     reader->Initialize(
 482         kDriveFile,
 483         byte_range,
 484         google_apis::test_util::CreateQuitCallback(
 485             &run_loop,
 486             google_apis::test_util::CreateCopyResultCallback(&error, &entry)));
 487     run_loop.Run();
 488   }
 489   EXPECT_EQ(net::ERR_REQUEST_RANGE_NOT_SATISFIABLE, error);
 490   EXPECT_FALSE(entry);
 491 }
 492
 493 TEST_F(DriveFileStreamReaderTest, ZeroByteFileRead) {
 494   // Prepare an empty file
 495   {
 496     google_apis::GDataErrorCode error = google_apis::GDATA_OTHER_ERROR;
 497     scoped_ptr<google_apis::FileResource> entry;
 498     fake_drive_service_->AddNewFile(
 499         "text/plain",
 500         "",  // empty
 501         fake_drive_service_->GetRootResourceId(),
 502         "EmptyFile.txt",
 503         false,  // shared_with_me
 504         google_apis::test_util::CreateCopyResultCallback(&error, &entry));
 505     content::RunAllBlockingPoolTasksUntilIdle();
 506     ASSERT_EQ(google_apis::HTTP_CREATED, error);
 507     ASSERT_TRUE(entry);
 508     ASSERT_EQ(0, entry->file_size());
 509   }
 510
 511   const base::FilePath kDriveFile =
 512       util::GetDriveMyDriveRootPath().AppendASCII("EmptyFile.txt");
 513   // Create the reader, and initialize it.
 514   // In this case, the file is not yet locally cached.
 515   scoped_ptr<DriveFileStreamReader> reader(new DriveFileStreamReader(
 516       GetFileSystemGetter(), worker_thread_->message_loop_proxy().get()));
 517   EXPECT_FALSE(reader->IsInitialized());
 518
 519   int error = net::ERR_FAILED;
 520   scoped_ptr<ResourceEntry> entry;
 521   {
 522     base::RunLoop run_loop;
 523     reader->Initialize(
 524         kDriveFile,
 525         net::HttpByteRange(),
 526         google_apis::test_util::CreateQuitCallback(
 527             &run_loop,
 528             google_apis::test_util::CreateCopyResultCallback(&error, &entry)));
 529     run_loop.Run();
 530   }
 531   EXPECT_EQ(net::OK, error);
 532   ASSERT_TRUE(entry);
 533   ASSERT_EQ(0u, entry->file_info().size());  // It's a zero-byte file.
 534   EXPECT_TRUE(reader->IsInitialized());
 535
 536   // Read data from the reader. Check that it successfuly reads empty data.
 537   std::string first_content;
 538   ASSERT_EQ(net::OK, test_util::ReadAllData(reader.get(), &first_content));
 539   EXPECT_EQ(0u, first_content.size());
 540
 541   // Create second instance and initialize it.
 542   // In this case, the file should be cached one.
 543   reader.reset(new DriveFileStreamReader(
 544       GetFileSystemGetter(), worker_thread_->message_loop_proxy().get()));
 545   EXPECT_FALSE(reader->IsInitialized());
 546
 547   error = net::ERR_FAILED;
 548   entry.reset();
 549   {
 550     base::RunLoop run_loop;
 551     reader->Initialize(
 552         kDriveFile,
 553         net::HttpByteRange(),
 554         google_apis::test_util::CreateQuitCallback(
 555             &run_loop,
 556             google_apis::test_util::CreateCopyResultCallback(&error, &entry)));
 557     run_loop.Run();
 558   }
 559   EXPECT_EQ(net::OK, error);
 560   ASSERT_TRUE(entry);
 561   EXPECT_TRUE(reader->IsInitialized());
 562
 563   // Read data from the reader, again.
 564   std::string second_content;
 565   ASSERT_EQ(net::OK, test_util::ReadAllData(reader.get(), &second_content));
 566   EXPECT_EQ(0u, second_content.size());
 567 }
 568
 569 }  // namespace drive