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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 | |
3 // found in the LICENSE file. | |
4 | |
5 #include "components/rappor/rappor_service.h" | |
6 | |
7 #include "base/base64.h" | |
8 #include "base/metrics/field_trial.h" | |
9 #include "base/prefs/pref_registry_simple.h" | |
10 #include "base/prefs/pref_service.h" | |
11 #include "base/rand_util.h" | |
12 #include "base/stl_util.h" | |
13 #include "components/rappor/proto/rappor_metric.pb.h" | |
14 #include "components/rappor/rappor_pref_names.h" | |
15 #include "components/variations/metrics_util.h" | |
16 #include "components/variations/variations_associated_data.h" | |
17 | |
18 namespace rappor { | |
19 | |
20 namespace { | |
21 | |
22 // The number of cohorts we divide clients into. | |
23 const int kNumCohorts = 8; | |
24 | |
25 // Length of the rappor secret in bytes. | |
26 const int kRapporSecretSize = 128; | |
27 | |
28 // Seconds before the initial log is generated. | |
29 const int kInitialLogIntervalSeconds = 15; | |
30 // Interval between ongoing logs. | |
31 const int kLogIntervalSeconds = 30 * 60; | |
32 | |
33 const char kMimeType[] = "application/vnd.chrome.rappor"; | |
34 | |
35 // Constants for the RAPPOR rollout field trial. | |
36 const char kRapporRolloutFieldTrialName[] = "RapporRollout"; | |
37 | |
38 // Constant for the finch parameter name for the server URL | |
39 const char kRapporRolloutServerUrlParam[] = "ServerUrl"; | |
40 | |
41 GURL GetServerUrl() { | |
42 return GURL(chrome_variations::GetVariationParamValue( | |
43 kRapporRolloutFieldTrialName, | |
44 kRapporRolloutServerUrlParam)); | |
45 } | |
46 | |
47 const RapporParameters kRapporParametersForType[NUM_RAPPOR_TYPES] = { | |
48 { // ETLD_PLUS_ONE_RAPPOR_TYPE | |
49 16 /* Bloom filter size bytes */, | |
50 2 /* Bloom filter hash count */, | |
51 rappor::PROBABILITY_75 /* Fake data probability */, | |
52 rappor::PROBABILITY_50 /* Fake one probability */, | |
53 rappor::PROBABILITY_75 /* One coin probability */, | |
54 rappor::PROBABILITY_50 /* Zero coin probability */ | |
55 }, | |
56 }; | |
57 | |
58 } // namespace | |
59 | |
60 RapporService::RapporService() : cohort_(-1) {} | |
61 | |
62 RapporService::~RapporService() {} | |
63 | |
64 void RapporService::Start(PrefService* pref_service, | |
65 net::URLRequestContextGetter* request_context) { | |
66 GURL server_url = GetServerUrl(); | |
67 if (!server_url.is_valid()) | |
68 return; | |
69 DCHECK(!uploader_); | |
70 LoadSecret(pref_service); | |
71 LoadCohort(pref_service); | |
72 uploader_.reset(new LogUploader(server_url, kMimeType, request_context)); | |
73 log_rotation_timer_.Start( | |
74 FROM_HERE, | |
75 base::TimeDelta::FromSeconds(kInitialLogIntervalSeconds), | |
76 this, | |
77 &RapporService::OnLogInterval); | |
78 } | |
79 | |
80 void RapporService::OnLogInterval() { | |
81 DCHECK(uploader_); | |
82 RapporReports reports; | |
83 if (ExportMetrics(&reports)) { | |
84 std::string log_text; | |
85 bool success = reports.SerializeToString(&log_text); | |
86 DCHECK(success); | |
87 uploader_->QueueLog(log_text); | |
88 } | |
89 log_rotation_timer_.Start(FROM_HERE, | |
90 base::TimeDelta::FromSeconds(kLogIntervalSeconds), | |
91 this, | |
92 &RapporService::OnLogInterval); | |
93 } | |
94 | |
95 // static | |
96 void RapporService::RegisterPrefs(PrefRegistrySimple* registry) { | |
97 registry->RegisterStringPref(prefs::kRapporSecret, std::string()); | |
98 registry->RegisterIntegerPref(prefs::kRapporCohort, -1); | |
99 } | |
100 | |
101 void RapporService::LoadCohort(PrefService* pref_service) { | |
102 DCHECK_EQ(cohort_, -1); | |
103 cohort_ = pref_service->GetInteger(prefs::kRapporCohort); | |
104 if (cohort_ >= 0 && cohort_ < kNumCohorts) | |
105 return; | |
106 | |
107 cohort_ = base::RandGenerator(kNumCohorts); | |
108 pref_service->SetInteger(prefs::kRapporCohort, cohort_); | |
109 } | |
110 | |
111 void RapporService::LoadSecret(PrefService* pref_service) { | |
112 DCHECK(secret_.empty()); | |
113 std::string secret_base64 = | |
114 pref_service->GetString(prefs::kRapporSecret); | |
115 if (!secret_base64.empty()) { | |
116 bool decoded = base::Base64Decode(secret_base64, &secret_); | |
117 if (decoded) | |
118 return; | |
119 // If the preference fails to decode, it must be corrupt, so continue as | |
120 // though it didn't exist yet and generate a new one. | |
121 } | |
122 | |
123 secret_ = base::RandBytesAsString(kRapporSecretSize); | |
124 base::Base64Encode(secret_, &secret_base64); | |
125 pref_service->SetString(prefs::kRapporSecret, secret_base64); | |
126 } | |
127 | |
128 bool RapporService::ExportMetrics(RapporReports* reports) { | |
129 base::AutoLock auto_lock(lock_); | |
130 if (metrics_map_.empty()) | |
131 return false; | |
132 | |
133 DCHECK_GE(cohort_, 0); | |
134 reports->set_cohort(cohort_); | |
135 | |
136 for (std::map<std::string, RapporMetric*>::iterator it = metrics_map_.begin(); | |
137 metrics_map_.end() != it; | |
138 ++it) { | |
139 const RapporMetric* metric = it->second; | |
140 RapporReports::Report* report = reports->add_report(); | |
141 report->set_name_hash(metrics::HashMetricName(it->first)); | |
142 ByteVector bytes = metric->GetReport(secret_); | |
143 report->set_bits(std::string(bytes.begin(), bytes.end())); | |
144 } | |
145 STLDeleteContainerPairSecondPointers( | |
146 metrics_map_.begin(), metrics_map_.end()); | |
147 metrics_map_.clear(); | |
148 return true; | |
149 } | |
150 | |
151 bool RapporService::IsInitialized() { | |
Alexei Svitkine (slow)
2014/02/06 17:47:20
Nit: Make this const
Steven Holte
2014/02/06 23:07:08
Done.
| |
152 return cohort_ >= 0; | |
153 } | |
154 | |
155 void RapporService::RecordSample(const std::string& metric_name, | |
156 RapporType type, | |
157 const std::string& sample) { | |
158 // Ignore the sample if the service hasn't started yet. | |
159 if (!IsInitialized()) | |
160 return; | |
161 DCHECK_LT(type, NUM_RAPPOR_TYPES); | |
162 RecordSampleInternal(metric_name, kRapporParametersForType[type], sample); | |
163 } | |
164 | |
165 void RapporService::RecordSampleInternal(const std::string& metric_name, | |
166 const RapporParameters& parameters, | |
167 const std::string& sample) { | |
168 DCHECK(IsInitialized()); | |
169 base::AutoLock auto_lock(lock_); | |
170 | |
171 RapporMetric* metric = LookupMetric(metric_name, parameters); | |
172 metric->AddSample(sample); | |
173 } | |
174 | |
175 RapporMetric* RapporService::LookupMetric(const std::string& metric_name, | |
176 const RapporParameters& parameters) { | |
177 DCHECK(IsInitialized()); | |
178 std::map<std::string, RapporMetric*>::iterator it = | |
179 metrics_map_.find(metric_name); | |
180 if (metrics_map_.end() != it) { | |
181 RapporMetric* metric = it->second; | |
182 DCHECK_EQ(parameters.ToString(), metric->parameters()->ToString()); | |
183 return metric; | |
184 } | |
185 | |
186 RapporMetric* new_metric = new RapporMetric(metric_name, parameters, cohort_); | |
187 metrics_map_[metric_name] = new_metric; | |
188 return new_metric; | |
189 } | |
190 | |
191 } // namespace rappor | |
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