blob: 38b4a296ca881126da2790c38228ea5bd08f05b2 [file] [log] [blame]
// 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 "chrome/browser/metrics/extensions_metrics_provider.h"
#include <set>
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/strings/stringprintf.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "components/metrics/metrics_log.h"
#include "components/metrics/metrics_state_manager.h"
#include "components/metrics/proto/system_profile.pb.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/common/extension_set.h"
#include "third_party/smhasher/src/City.h"
namespace {
// The number of possible hash keys that a client may use. The UMA client_id
// value is reduced modulo this value to produce the key used by that
// particular client.
const size_t kExtensionListClientKeys = 4096;
// The number of hash buckets into which extension IDs are mapped. This sets
// the possible output range of the HashExtension function.
const size_t kExtensionListBuckets = 1024;
} // namespace
metrics::MetricsStateManager* metrics_state_manager)
: metrics_state_manager_(metrics_state_manager), cached_profile_(NULL) {
ExtensionsMetricsProvider::~ExtensionsMetricsProvider() {
// static
int ExtensionsMetricsProvider::HashExtension(const std::string& extension_id,
uint32 client_key) {
DCHECK_LE(client_key, kExtensionListClientKeys);
std::string message =
base::StringPrintf("%u:%s", client_key, extension_id.c_str());
uint64 output = CityHash64(, message.size());
return output % kExtensionListBuckets;
Profile* ExtensionsMetricsProvider::GetMetricsProfile() {
ProfileManager* profile_manager = g_browser_process->profile_manager();
if (!profile_manager)
return NULL;
// If there is a cached profile, reuse that. However, check that it is still
// valid first.
if (cached_profile_ && profile_manager->IsValidProfile(cached_profile_))
return cached_profile_;
// Find a suitable profile to use, and cache it so that we continue to report
// statistics on the same profile. We would simply use
// ProfileManager::GetLastUsedProfile(), except that that has the side effect
// of creating a profile if it does not yet exist.
cached_profile_ = profile_manager->GetProfileByPath(
if (cached_profile_) {
// Ensure that the returned profile is not an incognito profile.
cached_profile_ = cached_profile_->GetOriginalProfile();
return cached_profile_;
ExtensionsMetricsProvider::GetInstalledExtensions() {
// UMA reports do not support multiple profiles, but extensions are installed
// per-profile. We return the extensions installed in the primary profile.
// In the future, we might consider reporting data about extensions in all
// profiles.
Profile* profile = GetMetricsProfile();
if (profile) {
return extensions::ExtensionRegistry::Get(profile)
#endif // defined(ENABLE_EXTENSIONS)
return scoped_ptr<extensions::ExtensionSet>();
uint64 ExtensionsMetricsProvider::GetClientID() {
// TODO(blundell): Create a MetricsLog::ClientIDAsInt() API and call it
// here as well as in MetricsLog's population of the client_id field of
// the uma_proto.
return MetricsLog::Hash(metrics_state_manager_->client_id());
void ExtensionsMetricsProvider::ProvideSystemProfileMetrics(
metrics::SystemProfileProto* system_profile) {
scoped_ptr<extensions::ExtensionSet> extensions(GetInstalledExtensions());
if (!extensions)
const int client_key = GetClientID() % kExtensionListClientKeys;
std::set<int> buckets;
for (extensions::ExtensionSet::const_iterator it = extensions->begin();
it != extensions->end();
++it) {
buckets.insert(HashExtension((*it)->id(), client_key));
for (std::set<int>::const_iterator it = buckets.begin(); it != buckets.end();
++it) {