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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 "chrome/browser/metrics/extension_metrics.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 "chrome/common/metrics/proto/system_profile.pb.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/common/extension_set.h"
// From third_party/smhasher/src/City.h; that file can't be included here due
// to macro redefinitions (of UINT8_C, etc.) on Windows.
// TODO(mvrable): Clean up City.h so it can be included directly.
uint64 CityHash64(const char *buf, size_t len);
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
HashedExtensionMetrics::HashedExtensionMetrics(uint64 client_id)
: client_key_(client_id % kExtensionListClientKeys),
cached_profile_(NULL) {}
HashedExtensionMetrics::~HashedExtensionMetrics() {}
// static
int HashedExtensionMetrics::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.data(), message.size());
return output % kExtensionListBuckets;
}
Profile* HashedExtensionMetrics::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.
cached_profile_ = ProfileManager::GetLastUsedProfile();
if (cached_profile_) {
// Ensure that the returned profile is not an incognito profile.
cached_profile_ = cached_profile_->GetOriginalProfile();
}
return cached_profile_;
}
scoped_ptr<extensions::ExtensionSet>
HashedExtensionMetrics::GetInstalledExtensions() {
#if defined(ENABLE_EXTENSIONS)
// 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)
->GenerateInstalledExtensionsSet();
}
#endif // defined(ENABLE_EXTENSIONS)
return scoped_ptr<extensions::ExtensionSet>();
}
void HashedExtensionMetrics::WriteExtensionList(
metrics::SystemProfileProto* system_profile) {
scoped_ptr<extensions::ExtensionSet> extensions(GetInstalledExtensions());
if (!extensions)
return;
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) {
system_profile->add_occupied_extension_bucket(*it);
}
}
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