1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "components/variations/processed_study.h" 6 7 #include <set> 8 9 #include "base/version.h" 10 #include "components/variations/proto/study.pb.h" 11 12 namespace chrome_variations { 13 14 namespace { 15 16 // Validates the sanity of |study| and computes the total probability. 17 bool ValidateStudyAndComputeTotalProbability( 18 const Study& study, 19 base::FieldTrial::Probability* total_probability) { 20 // At the moment, a missing default_experiment_name makes the study invalid. 21 if (study.default_experiment_name().empty()) { 22 DVLOG(1) << study.name() << " has no default experiment defined."; 23 return false; 24 } 25 if (study.filter().has_min_version() && 26 !Version::IsValidWildcardString(study.filter().min_version())) { 27 DVLOG(1) << study.name() << " has invalid min version: " 28 << study.filter().min_version(); 29 return false; 30 } 31 if (study.filter().has_max_version() && 32 !Version::IsValidWildcardString(study.filter().max_version())) { 33 DVLOG(1) << study.name() << " has invalid max version: " 34 << study.filter().max_version(); 35 return false; 36 } 37 38 const std::string& default_group_name = study.default_experiment_name(); 39 base::FieldTrial::Probability divisor = 0; 40 41 bool found_default_group = false; 42 std::set<std::string> experiment_names; 43 for (int i = 0; i < study.experiment_size(); ++i) { 44 if (study.experiment(i).name().empty()) { 45 DVLOG(1) << study.name() << " is missing experiment " << i << " name"; 46 return false; 47 } 48 if (!experiment_names.insert(study.experiment(i).name()).second) { 49 DVLOG(1) << study.name() << " has a repeated experiment name " 50 << study.experiment(i).name(); 51 return false; 52 } 53 54 if (!study.experiment(i).has_forcing_flag()) 55 divisor += study.experiment(i).probability_weight(); 56 if (study.experiment(i).name() == default_group_name) 57 found_default_group = true; 58 } 59 60 if (!found_default_group) { 61 DVLOG(1) << study.name() << " is missing default experiment in its " 62 << "experiment list"; 63 // The default group was not found in the list of groups. This study is not 64 // valid. 65 return false; 66 } 67 68 *total_probability = divisor; 69 return true; 70 } 71 72 73 } // namespace 74 75 76 ProcessedStudy::ProcessedStudy() 77 : study_(NULL), total_probability_(0), is_expired_(false) { 78 } 79 80 ProcessedStudy::~ProcessedStudy() { 81 } 82 83 bool ProcessedStudy::Init(const Study* study, bool is_expired) { 84 base::FieldTrial::Probability total_probability = 0; 85 if (!ValidateStudyAndComputeTotalProbability(*study, &total_probability)) 86 return false; 87 88 study_ = study; 89 is_expired_ = is_expired; 90 total_probability_ = total_probability; 91 return true; 92 } 93 94 // static 95 bool ProcessedStudy::ValidateAndAppendStudy( 96 const Study* study, 97 bool is_expired, 98 std::vector<ProcessedStudy>* processed_studies) { 99 ProcessedStudy processed_study; 100 if (processed_study.Init(study, is_expired)) { 101 processed_studies->push_back(processed_study); 102 return true; 103 } 104 return false; 105 } 106 107 } // namespace chrome_variations 108
