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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/variations/variations_associated_data.h"
#include <map>
#include <utility>
#include <vector>
#include "base/memory/singleton.h"
#include "base/metrics/field_trial_param_associator.h"
#include "base/metrics/field_trial_params.h"
#include "base/strings/string_split.h"
namespace variations {
namespace {
// The internal singleton accessor for the map, used to keep it thread-safe.
class GroupMapAccessor {
public:
typedef std::map<ActiveGroupId, VariationID, ActiveGroupIdCompare>
GroupToIDMap;
// Retrieve the singleton.
static GroupMapAccessor* GetInstance() {
return base::Singleton<GroupMapAccessor,
base::LeakySingletonTraits<GroupMapAccessor>>::get();
}
GroupMapAccessor(const GroupMapAccessor&) = delete;
GroupMapAccessor& operator=(const GroupMapAccessor&) = delete;
// Ensures that |group_identifier| is associated with only one non-trigger,
// trigger, or signed-in key.
void ValidateID(IDCollectionKey key,
const ActiveGroupId& group_identifier,
const VariationID id) {
static_assert(ID_COLLECTION_COUNT == 6,
"If you add a new collection key, add handling code here!");
#if DCHECK_IS_ON()
for (int i = 0; i < ID_COLLECTION_COUNT; ++i) {
IDCollectionKey other_key = static_cast<IDCollectionKey>(i);
if (key == other_key)
continue;
VariationID other_id = GetID(other_key, group_identifier);
// For a GOOGLE_APP key, validate that all other collections with this
// |group_identifier| have the same associated ID.
if (key == GOOGLE_APP) {
DCHECK(other_id == EMPTY_ID || other_id == id);
continue;
}
// The ID should not be registered under a different non-GOOGLE_APP
// IDCollectionKey.
if (other_key != GOOGLE_APP)
DCHECK_EQ(EMPTY_ID, other_id);
}
#endif // DCHECK_IS_ON()
}
// Note that this normally only sets the ID for a group the first time, unless
// |force| is set to true, in which case it will always override it.
void AssociateID(IDCollectionKey key,
const ActiveGroupId& group_identifier,
const VariationID id,
const bool force) {
ValidateID(key, group_identifier, id);
base::AutoLock scoped_lock(lock_);
GroupToIDMap* group_to_id_map = GetGroupToIDMap(key);
if (force ||
group_to_id_map->find(group_identifier) == group_to_id_map->end())
(*group_to_id_map)[group_identifier] = id;
}
VariationID GetID(IDCollectionKey key,
const ActiveGroupId& group_identifier) {
base::AutoLock scoped_lock(lock_);
GroupToIDMap* group_to_id_map = GetGroupToIDMap(key);
GroupToIDMap::const_iterator it = group_to_id_map->find(group_identifier);
if (it == group_to_id_map->end())
return EMPTY_ID;
return it->second;
}
void ClearAllMapsForTesting() {
base::AutoLock scoped_lock(lock_);
for (int i = 0; i < ID_COLLECTION_COUNT; ++i) {
GroupToIDMap* map = GetGroupToIDMap(static_cast<IDCollectionKey>(i));
DCHECK(map);
map->clear();
}
}
private:
friend struct base::DefaultSingletonTraits<GroupMapAccessor>;
// Retrieves the GroupToIDMap for |key|.
GroupToIDMap* GetGroupToIDMap(IDCollectionKey key) {
return &group_to_id_maps_[key];
}
GroupMapAccessor() {
group_to_id_maps_.resize(ID_COLLECTION_COUNT);
}
~GroupMapAccessor() = default;
base::Lock lock_;
std::vector<GroupToIDMap> group_to_id_maps_;
};
} // namespace
void AssociateGoogleVariationID(IDCollectionKey key,
const std::string& trial_name,
const std::string& group_name,
VariationID id) {
GroupMapAccessor::GetInstance()->AssociateID(
key, MakeActiveGroupId(trial_name, group_name), id, false);
}
void AssociateGoogleVariationIDForce(IDCollectionKey key,
const std::string& trial_name,
const std::string& group_name,
VariationID id) {
AssociateGoogleVariationIDForceHashes(
key, MakeActiveGroupId(trial_name, group_name), id);
}
void AssociateGoogleVariationIDForceHashes(IDCollectionKey key,
const ActiveGroupId& active_group,
VariationID id) {
GroupMapAccessor::GetInstance()->AssociateID(key, active_group, id, true);
}
VariationID GetGoogleVariationID(IDCollectionKey key,
const std::string& trial_name,
const std::string& group_name) {
return GetGoogleVariationIDFromHashes(
key, MakeActiveGroupId(trial_name, group_name));
}
VariationID GetGoogleVariationIDFromHashes(
IDCollectionKey key,
const ActiveGroupId& active_group) {
return GroupMapAccessor::GetInstance()->GetID(key, active_group);
}
// Functions below are exposed for testing explicitly behind this namespace.
// They simply wrap existing functions in this file.
namespace testing {
void ClearAllVariationIDs() {
GroupMapAccessor::GetInstance()->ClearAllMapsForTesting();
}
void ClearAllVariationParams() {
base::FieldTrialParamAssociator::GetInstance()->ClearAllParamsForTesting();
}
} // namespace testing
} // namespace variations
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