components/domain_reliability/config.cc

   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 // Make sure stdint.h includes SIZE_MAX. (See C89, p259, footnote 221.)
   6 #ifndef __STDC_LIMIT_MACROS
   7 #define __STDC_LIMIT_MACROS 1
   8 #endif
   9
  10 #include "components/domain_reliability/config.h"
  11
  12 #include <stdint.h>
  13
  14 #include "base/json/json_reader.h"
  15 #include "base/json/json_value_converter.h"
  16 #include "base/rand_util.h"
  17 #include "base/strings/string_util.h"
  18
  19 namespace {
  20
  21 bool ConvertURL(const base::StringPiece& string_piece, GURL* url) {
  22   *url = GURL(string_piece.as_string());
  23   return url->is_valid();
  24 }
  25
  26 bool IsValidSampleRate(double p) { return p >= 0.0 && p <= 1.0; }
  27
  28 }  // namespace
  29
  30 namespace domain_reliability {
  31
  32 // static
  33 const size_t DomainReliabilityConfig::kInvalidResourceIndex = SIZE_MAX;
  34
  35 DomainReliabilityConfig::Resource::Resource() {
  36 }
  37 DomainReliabilityConfig::Resource::~Resource() {}
  38
  39 bool DomainReliabilityConfig::Resource::MatchesUrl(const GURL& url) const {
  40   const std::string& spec = url.spec();
  41
  42   ScopedVector<std::string>::const_iterator it;
  43   for (it = url_patterns.begin(); it != url_patterns.end(); it++) {
  44     if (MatchPattern(spec, **it))
  45       return true;
  46   }
  47
  48   return false;
  49 }
  50
  51 bool DomainReliabilityConfig::Resource::DecideIfShouldReportRequest(
  52     bool success) const {
  53   double sample_rate = success ? success_sample_rate : failure_sample_rate;
  54   DCHECK(IsValidSampleRate(sample_rate));
  55   return base::RandDouble() < sample_rate;
  56 }
  57
  58 // static
  59 void DomainReliabilityConfig::Resource::RegisterJSONConverter(
  60     base::JSONValueConverter<DomainReliabilityConfig::Resource>* converter) {
  61   converter->RegisterStringField("resource_name", &Resource::name);
  62   converter->RegisterRepeatedString("url_patterns", &Resource::url_patterns);
  63   converter->RegisterDoubleField("success_sample_rate",
  64                                  &Resource::success_sample_rate);
  65   converter->RegisterDoubleField("failure_sample_rate",
  66                                  &Resource::failure_sample_rate);
  67 }
  68
  69 bool DomainReliabilityConfig::Resource::IsValid() const {
  70   return !name.empty() && !url_patterns.empty() &&
  71       IsValidSampleRate(success_sample_rate) &&
  72       IsValidSampleRate(failure_sample_rate);
  73 }
  74
  75 DomainReliabilityConfig::Collector::Collector() {}
  76 DomainReliabilityConfig::Collector::~Collector() {}
  77
  78 // static
  79 void DomainReliabilityConfig::Collector::RegisterJSONConverter(
  80     base::JSONValueConverter<DomainReliabilityConfig::Collector>* converter) {
  81   converter->RegisterCustomField<GURL>("upload_url", &Collector::upload_url,
  82                                        &ConvertURL);
  83 }
  84
  85 bool DomainReliabilityConfig::Collector::IsValid() const {
  86   return upload_url.is_valid();
  87 }
  88
  89 DomainReliabilityConfig::DomainReliabilityConfig() : valid_until(0.0) {}
  90 DomainReliabilityConfig::~DomainReliabilityConfig() {}
  91
  92 // static
  93 scoped_ptr<const DomainReliabilityConfig> DomainReliabilityConfig::FromJSON(
  94     const base::StringPiece& json) {
  95   scoped_ptr<base::Value> value(base::JSONReader::Read(json));
  96   base::JSONValueConverter<DomainReliabilityConfig> converter;
  97   DomainReliabilityConfig* config = new DomainReliabilityConfig();
  98
  99   // If we can parse and convert the JSON into a valid config, return that.
 100   if (value && converter.Convert(*value, config) && config->IsValid())
 101     return scoped_ptr<const DomainReliabilityConfig>(config);
 102   else
 103     return scoped_ptr<const DomainReliabilityConfig>();
 104 }
 105
 106 bool DomainReliabilityConfig::IsValid() const {
 107   if (valid_until == 0.0 || domain.empty() ||
 108       resources.empty() || collectors.empty()) {
 109     return false;
 110   }
 111
 112   for (size_t i = 0; i < resources.size(); ++i) {
 113     if (!resources[i]->IsValid())
 114       return false;
 115   }
 116
 117   for (size_t i = 0; i < collectors.size(); ++i) {
 118     if (!collectors[i]->IsValid())
 119       return false;
 120   }
 121
 122   return true;
 123 }
 124
 125 bool DomainReliabilityConfig::IsExpired(base::Time now) const {
 126   DCHECK_NE(0.0, valid_until);
 127   base::Time valid_until_time = base::Time::FromDoubleT(valid_until);
 128   return now > valid_until_time;
 129 }
 130
 131 size_t DomainReliabilityConfig::GetResourceIndexForUrl(const GURL& url) const {
 132   // Removes username, password, and fragment.
 133   GURL sanitized_url = url.GetAsReferrer();
 134
 135   for (size_t i = 0; i < resources.size(); ++i) {
 136     if (resources[i]->MatchesUrl(sanitized_url))
 137       return i;
 138   }
 139
 140   return kInvalidResourceIndex;
 141 }
 142
 143 // static
 144 void DomainReliabilityConfig::RegisterJSONConverter(
 145     base::JSONValueConverter<DomainReliabilityConfig>* converter) {
 146   converter->RegisterStringField("config_version",
 147                                  &DomainReliabilityConfig::version);
 148   converter->RegisterDoubleField("config_valid_until",
 149                                  &DomainReliabilityConfig::valid_until);
 150   converter->RegisterStringField("monitored_domain",
 151                                  &DomainReliabilityConfig::domain);
 152   converter->RegisterRepeatedMessage("monitored_resources",
 153                                      &DomainReliabilityConfig::resources);
 154   converter->RegisterRepeatedMessage("collectors",
 155                                      &DomainReliabilityConfig::collectors);
 156 }
 157
 158 }  // namespace domain_reliability