Index: chrome/installer/setup/installer_metrics.cc |
diff --git a/chrome/installer/setup/installer_metrics.cc b/chrome/installer/setup/installer_metrics.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..8e5f0443e437f7589493be0818c56ef397cf2b17 |
--- /dev/null |
+++ b/chrome/installer/setup/installer_metrics.cc |
@@ -0,0 +1,55 @@ |
+// Copyright 2016 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "chrome/installer/setup/installer_metrics.h" |
+ |
+#include "base/files/file.h" |
+#include "base/files/file_path.h" |
+#include "base/files/file_util.h" |
+#include "base/metrics/histogram_base.h" |
+#include "base/metrics/histogram_persistence.h" |
+#include "base/metrics/persistent_memory_allocator.h" |
+#include "chrome/installer/util/util_constants.h" |
+ |
+namespace installer { |
+ |
+void BeginPersistentHistogramStorage() { |
+ base::SetPersistentHistogramMemoryAllocator( |
+ new base::LocalPersistentMemoryAllocator( |
+ 1 << 20, 0, // 1 MiB |
+ installer::kSetupHistogramAllocatorName)); |
+ base::GetPersistentHistogramMemoryAllocator()->CreateTrackingHistograms( |
+ installer::kSetupHistogramAllocatorName); |
+} |
+ |
+void EndPersistentHistogramStorage(const base::FilePath& target_path) { |
+ // For atomicity, first write to a temporary file and then rename it. |
+ // The ImportantFileWriter would be good for this except it supports only |
+ // std::string for its data. |
+ base::PersistentMemoryAllocator* allocator = |
+ base::GetPersistentHistogramMemoryAllocator(); |
+ allocator->UpdateTrackingHistograms(); |
+ |
+ base::FilePath file_path = target_path |
+ .AppendASCII(allocator->Name()) |
+ .AddExtension(L".pma"); |
+ base::FilePath tmp_file_path; |
+ base::DeleteFile(file_path, false); |
+ |
+ if (base::CreateTemporaryFileInDir(file_path.DirName(), &tmp_file_path)) { |
+ // Allocator doesn't support more than 1GB so can never overflow. |
+ int used = static_cast<int>(allocator->used()); |
+ if (base::WriteFile(tmp_file_path, |
+ static_cast<const char*>(allocator->data()), |
+ used) == used) { |
+ if (base::ReplaceFile(tmp_file_path, file_path, nullptr)) { |
+ VLOG(1) << "Persistent histograms saved in file: " |
+ << file_path.value(); |
+ } |
+ } |
+ base::DeleteFile(tmp_file_path, false); |
+ } |
+} |
+ |
+} // namespace installer |