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| 1 // Copyright 2016 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/installer/setup/installer_metrics.h" |
| 6 |
| 7 #include "base/files/file.h" |
| 8 #include "base/files/file_path.h" |
| 9 #include "base/files/file_util.h" |
| 10 #include "base/metrics/histogram_base.h" |
| 11 #include "base/metrics/histogram_persistence.h" |
| 12 #include "base/metrics/persistent_memory_allocator.h" |
| 13 #include "chrome/installer/util/util_constants.h" |
| 14 |
| 15 namespace installer { |
| 16 |
| 17 void BeginPersistentHistogramStorage() { |
| 18 base::SetPersistentHistogramMemoryAllocator( |
| 19 new base::LocalPersistentMemoryAllocator( |
| 20 1 << 20, 0, // 1 MiB |
| 21 installer::kSetupHistogramAllocatorName)); |
| 22 base::GetPersistentHistogramMemoryAllocator()->CreateTrackingHistograms( |
| 23 installer::kSetupHistogramAllocatorName); |
| 24 } |
| 25 |
| 26 void EndPersistentHistogramStorage(const base::FilePath& target_path) { |
| 27 // For atomicity, first write to a temporary file and then rename it. |
| 28 // The ImportantFileWriter would be good for this except it supports only |
| 29 // std::string for its data. |
| 30 base::PersistentMemoryAllocator* allocator = |
| 31 base::GetPersistentHistogramMemoryAllocator(); |
| 32 allocator->UpdateTrackingHistograms(); |
| 33 |
| 34 base::FilePath file_path = target_path |
| 35 .AppendASCII(allocator->Name()) |
| 36 .AddExtension(L".pma"); |
| 37 base::FilePath tmp_file_path; |
| 38 base::DeleteFile(file_path, false); |
| 39 |
| 40 if (base::CreateTemporaryFileInDir(file_path.DirName(), &tmp_file_path)) { |
| 41 // Allocator doesn't support more than 1GB so can never overflow. |
| 42 int used = static_cast<int>(allocator->used()); |
| 43 if (base::WriteFile(tmp_file_path, |
| 44 static_cast<const char*>(allocator->data()), |
| 45 used) == used) { |
| 46 if (base::ReplaceFile(tmp_file_path, file_path, nullptr)) { |
| 47 VLOG(1) << "Persistent histograms saved in file: " |
| 48 << file_path.value(); |
| 49 } |
| 50 } |
| 51 base::DeleteFile(tmp_file_path, false); |
| 52 } |
| 53 } |
| 54 |
| 55 } // namespace installer |
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