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// Copyright 2013 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/variations/processed_study.h"
#include <set>
#include <string>
#include "base/version.h"
#include "components/variations/proto/study.pb.h"
namespace variations {
namespace {
// Validates the sanity of |study| and computes the total probability and
// whether all assignments are to a single group.
bool ValidateStudyAndComputeTotalProbability(
const Study& study,
base::FieldTrial::Probability* total_probability,
bool* all_assignments_to_one_group,
std::string* single_feature_name) {
if (study.filter().has_min_version() &&
!base::Version::IsValidWildcardString(study.filter().min_version())) {
DVLOG(1) << study.name() << " has invalid min version: "
<< study.filter().min_version();
return false;
}
if (study.filter().has_max_version() &&
!base::Version::IsValidWildcardString(study.filter().max_version())) {
DVLOG(1) << study.name() << " has invalid max version: "
<< study.filter().max_version();
return false;
}
const std::string& default_group_name = study.default_experiment_name();
base::FieldTrial::Probability divisor = 0;
bool multiple_assigned_groups = false;
bool found_default_group = false;
std::string single_feature_name_seen;
bool has_multiple_features = false;
std::set<std::string> experiment_names;
for (int i = 0; i < study.experiment_size(); ++i) {
const Study_Experiment& experiment = study.experiment(i);
if (experiment.name().empty()) {
DVLOG(1) << study.name() << " is missing experiment " << i << " name";
return false;
}
if (!experiment_names.insert(experiment.name()).second) {
DVLOG(1) << study.name() << " has a repeated experiment name "
<< study.experiment(i).name();
return false;
}
if (!has_multiple_features) {
const auto& features = experiment.feature_association();
for (int i = 0; i < features.enable_feature_size(); ++i) {
const std::string& feature_name = features.enable_feature(i);
if (single_feature_name_seen.empty()) {
single_feature_name_seen = feature_name;
} else if (feature_name != single_feature_name_seen) {
has_multiple_features = true;
break;
}
}
for (int i = 0; i < features.disable_feature_size(); ++i) {
const std::string& feature_name = features.disable_feature(i);
if (single_feature_name_seen.empty()) {
single_feature_name_seen = feature_name;
} else if (feature_name != single_feature_name_seen) {
has_multiple_features = true;
break;
}
}
}
if (!experiment.has_forcing_flag() && experiment.probability_weight() > 0) {
// If |divisor| is not 0, there was at least one prior non-zero group.
if (divisor != 0)
multiple_assigned_groups = true;
divisor += experiment.probability_weight();
}
if (study.experiment(i).name() == default_group_name)
found_default_group = true;
}
// Specifying a default experiment is optional, so finding it in the
// experiment list is only required when it is specified.
if (!study.default_experiment_name().empty() && !found_default_group) {
DVLOG(1) << study.name() << " is missing default experiment ("
<< study.default_experiment_name() << ") in its experiment list";
// The default group was not found in the list of groups. This study is not
// valid.
return false;
}
if (!has_multiple_features && !single_feature_name_seen.empty())
single_feature_name->swap(single_feature_name_seen);
else
single_feature_name->clear();
*total_probability = divisor;
*all_assignments_to_one_group = !multiple_assigned_groups;
return true;
}
} // namespace
// static
const char ProcessedStudy::kGenericDefaultExperimentName[] =
"VariationsDefaultExperiment";
ProcessedStudy::ProcessedStudy()
: study_(NULL),
total_probability_(0),
all_assignments_to_one_group_(false),
is_expired_(false) {
}
ProcessedStudy::~ProcessedStudy() {
}
bool ProcessedStudy::Init(const Study* study, bool is_expired) {
base::FieldTrial::Probability total_probability = 0;
bool all_assignments_to_one_group = false;
std::string single_feature_name;
if (!ValidateStudyAndComputeTotalProbability(*study, &total_probability,
&all_assignments_to_one_group,
&single_feature_name)) {
return false;
}
study_ = study;
is_expired_ = is_expired;
total_probability_ = total_probability;
all_assignments_to_one_group_ = all_assignments_to_one_group;
single_feature_name_.swap(single_feature_name);
return true;
}
int ProcessedStudy::GetExperimentIndexByName(const std::string& name) const {
for (int i = 0; i < study_->experiment_size(); ++i) {
if (study_->experiment(i).name() == name)
return i;
}
return -1;
}
const char* ProcessedStudy::GetDefaultExperimentName() const {
if (study_->default_experiment_name().empty())
return kGenericDefaultExperimentName;
return study_->default_experiment_name().c_str();
}
// static
bool ProcessedStudy::ValidateAndAppendStudy(
const Study* study,
bool is_expired,
std::vector<ProcessedStudy>* processed_studies) {
ProcessedStudy processed_study;
if (processed_study.Init(study, is_expired)) {
processed_studies->push_back(processed_study);
return true;
}
return false;
}
} // namespace variations
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