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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #include "chrome/common/variations/experiment_labels.h" | 5 #include "chrome/common/variations/experiment_labels.h" |
| 6 | 6 |
| 7 #include <vector> | 7 #include <vector> |
| 8 | 8 |
| 9 #include "base/logging.h" | 9 #include "base/logging.h" |
| 10 #include "base/strings/string_number_conversions.h" | 10 #include "base/strings/string_number_conversions.h" |
| 11 #include "base/strings/string_split.h" | 11 #include "base/strings/string_split.h" |
| 12 #include "base/strings/string_util.h" | 12 #include "base/strings/string_util.h" |
| 13 #include "base/strings/utf_string_conversions.h" | 13 #include "base/strings/utf_string_conversions.h" |
| 14 #include "chrome/installer/util/google_update_experiment_util.h" | 14 #include "chrome/installer/util/google_update_experiment_util.h" |
| 15 #include "components/variations/variations_associated_data.h" | 15 #include "components/variations/variations_associated_data.h" |
| 16 | 16 |
| 17 namespace chrome_variations { | 17 namespace chrome_variations { |
| 18 | 18 |
| 19 namespace { | 19 namespace { |
| 20 | 20 |
| 21 const char kVariationPrefix[] = "CrVar"; | 21 const char kVariationPrefix[] = "CrVar"; |
| 22 | 22 |
| 23 // This method builds a single experiment label for a Chrome Variation, | 23 // This method builds a single experiment label for a Chrome Variation, |
| 24 // including a timestamp that is a year in the future from |current_time|. Since | 24 // including a timestamp that is a year in the future from |current_time|. Since |
| 25 // multiple headers can be transmitted, |count| is a number that is appended | 25 // multiple headers can be transmitted, |count| is a number that is appended |
| 26 // after the label key to differentiate the labels. | 26 // after the label key to differentiate the labels. |
| 27 base::string16 CreateSingleExperimentLabel(int count, VariationID id, | 27 base::string16 CreateSingleExperimentLabel(int count, |
| 28 variations::VariationID id, |
| 28 const base::Time& current_time) { | 29 const base::Time& current_time) { |
| 29 // Build the parts separately so they can be validated. | 30 // Build the parts separately so they can be validated. |
| 30 const base::string16 key = | 31 const base::string16 key = |
| 31 base::ASCIIToUTF16(kVariationPrefix) + base::IntToString16(count); | 32 base::ASCIIToUTF16(kVariationPrefix) + base::IntToString16(count); |
| 32 DCHECK_LE(key.size(), 8U); | 33 DCHECK_LE(key.size(), 8U); |
| 33 const base::string16 value = base::IntToString16(id); | 34 const base::string16 value = base::IntToString16(id); |
| 34 DCHECK_LE(value.size(), 8U); | 35 DCHECK_LE(value.size(), 8U); |
| 35 base::string16 label(key); | 36 base::string16 label(key); |
| 36 label += base::ASCIIToUTF16("="); | 37 label += base::ASCIIToUTF16("="); |
| 37 label += value; | 38 label += value; |
| 38 label += base::ASCIIToUTF16("|"); | 39 label += base::ASCIIToUTF16("|"); |
| 39 label += installer::BuildExperimentDateString(current_time); | 40 label += installer::BuildExperimentDateString(current_time); |
| 40 return label; | 41 return label; |
| 41 } | 42 } |
| 42 | 43 |
| 43 } // namespace | 44 } // namespace |
| 44 | 45 |
| 45 base::string16 BuildGoogleUpdateExperimentLabel( | 46 base::string16 BuildGoogleUpdateExperimentLabel( |
| 46 const base::FieldTrial::ActiveGroups& active_groups) { | 47 const base::FieldTrial::ActiveGroups& active_groups) { |
| 47 base::string16 experiment_labels; | 48 base::string16 experiment_labels; |
| 48 int counter = 0; | 49 int counter = 0; |
| 49 | 50 |
| 50 const base::Time current_time(base::Time::Now()); | 51 const base::Time current_time(base::Time::Now()); |
| 51 | 52 |
| 52 // Find all currently active VariationIDs associated with Google Update. | 53 // Find all currently active VariationIDs associated with Google Update. |
| 53 for (base::FieldTrial::ActiveGroups::const_iterator it = | 54 for (base::FieldTrial::ActiveGroups::const_iterator it = |
| 54 active_groups.begin(); it != active_groups.end(); ++it) { | 55 active_groups.begin(); it != active_groups.end(); ++it) { |
| 55 const VariationID id = GetGoogleVariationID(GOOGLE_UPDATE_SERVICE, | 56 const variations::VariationID id = |
| 56 it->trial_name, it->group_name); | 57 variations::GetGoogleVariationID(variations::GOOGLE_UPDATE_SERVICE, |
| 58 it->trial_name, it->group_name); |
| 57 | 59 |
| 58 if (id == EMPTY_ID) | 60 if (id == variations::EMPTY_ID) |
| 59 continue; | 61 continue; |
| 60 | 62 |
| 61 if (!experiment_labels.empty()) | 63 if (!experiment_labels.empty()) |
| 62 experiment_labels += google_update::kExperimentLabelSeparator; | 64 experiment_labels += google_update::kExperimentLabelSeparator; |
| 63 experiment_labels += CreateSingleExperimentLabel(++counter, id, | 65 experiment_labels += CreateSingleExperimentLabel(++counter, id, |
| 64 current_time); | 66 current_time); |
| 65 } | 67 } |
| 66 | 68 |
| 67 return experiment_labels; | 69 return experiment_labels; |
| 68 } | 70 } |
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| 99 DCHECK(!EndsWith(other_labels, separator, false)); | 101 DCHECK(!EndsWith(other_labels, separator, false)); |
| 100 // Note that if either label is empty, a separator is not necessary. | 102 // Note that if either label is empty, a separator is not necessary. |
| 101 base::string16 combined_labels = other_labels; | 103 base::string16 combined_labels = other_labels; |
| 102 if (!other_labels.empty() && !variation_labels.empty()) | 104 if (!other_labels.empty() && !variation_labels.empty()) |
| 103 combined_labels += google_update::kExperimentLabelSeparator; | 105 combined_labels += google_update::kExperimentLabelSeparator; |
| 104 combined_labels += variation_labels; | 106 combined_labels += variation_labels; |
| 105 return combined_labels; | 107 return combined_labels; |
| 106 } | 108 } |
| 107 | 109 |
| 108 } // namespace chrome_variations | 110 } // namespace chrome_variations |
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