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// Copyright 2014 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 "components/metrics/clean_exit_beacon.h"
#include "base/logging.h"
#include "base/prefs/pref_service.h"
#include "build/build_config.h"
#include "components/metrics/metrics_pref_names.h"
#if defined(OS_WIN)
#include "base/metrics/histogram.h"
#include "base/strings/utf_string_conversions.h"
#include "base/win/registry.h"
#endif
namespace metrics {
CleanExitBeacon::CleanExitBeacon(const base::string16& backup_registry_key,
PrefService* local_state)
: local_state_(local_state),
initial_value_(local_state->GetBoolean(prefs::kStabilityExitedCleanly)),
backup_registry_key_(backup_registry_key) {
DCHECK_NE(PrefService::INITIALIZATION_STATUS_WAITING,
local_state_->GetInitializationStatus());
#if defined(OS_WIN)
// An enumeration of all possible permutations of the the beacon state in the
// registry and in Local State.
enum {
DIRTY_DIRTY,
DIRTY_CLEAN,
CLEAN_DIRTY,
CLEAN_CLEAN,
MISSING_DIRTY,
MISSING_CLEAN,
NUM_CONSISTENCY_ENUMS
} consistency = DIRTY_DIRTY;
base::win::RegKey regkey;
DWORD value = 0u;
if (regkey.Open(HKEY_CURRENT_USER,
backup_registry_key_.c_str(),
KEY_ALL_ACCESS) == ERROR_SUCCESS &&
regkey.ReadValueDW(
base::ASCIIToUTF16(prefs::kStabilityExitedCleanly).c_str(), &value) ==
ERROR_SUCCESS) {
if (value)
consistency = initial_value_ ? CLEAN_CLEAN : CLEAN_DIRTY;
else
consistency = initial_value_ ? DIRTY_CLEAN : DIRTY_DIRTY;
} else {
consistency = initial_value_ ? MISSING_CLEAN : MISSING_DIRTY;
}
UMA_HISTOGRAM_ENUMERATION(
"UMA.CleanExitBeaconConsistency", consistency, NUM_CONSISTENCY_ENUMS);
#endif
}
CleanExitBeacon::~CleanExitBeacon() {
}
void CleanExitBeacon::WriteBeaconValue(bool value) {
local_state_->SetBoolean(prefs::kStabilityExitedCleanly, value);
#if defined(OS_WIN)
base::win::RegKey regkey;
if (regkey.Create(HKEY_CURRENT_USER,
backup_registry_key_.c_str(),
KEY_ALL_ACCESS) == ERROR_SUCCESS) {
regkey.WriteValue(
base::ASCIIToUTF16(prefs::kStabilityExitedCleanly).c_str(),
value ? 1u : 0u);
}
#endif
}
} // namespace metrics
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