src/components/omnibox/omnibox_field_trial.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 #include "components/omnibox/omnibox_field_trial.h"
   6
   7 #include <cmath>
   8 #include <string>
   9
  10 #include "base/command_line.h"
  11 #include "base/metrics/field_trial.h"
  12 #include "base/strings/string_number_conversions.h"
  13 #include "base/strings/string_split.h"
  14 #include "base/strings/string_util.h"
  15 #include "base/strings/stringprintf.h"
  16 #include "base/time/time.h"
  17 #include "components/metrics/proto/omnibox_event.pb.h"
  18 #include "components/omnibox/omnibox_switches.h"
  19 #include "components/search/search.h"
  20 #include "components/variations/active_field_trials.h"
  21 #include "components/variations/metrics_util.h"
  22 #include "components/variations/variations_associated_data.h"
  23
  24 using metrics::OmniboxEventProto;
  25
  26 namespace {
  27
  28 typedef std::map<std::string, std::string> VariationParams;
  29 typedef HUPScoringParams::ScoreBuckets ScoreBuckets;
  30
  31 // Field trial names.
  32 const char kStopTimerFieldTrialName[] = "OmniboxStopTimer";
  33
  34 // The autocomplete dynamic field trial name prefix.  Each field trial is
  35 // configured dynamically and is retrieved automatically by Chrome during
  36 // the startup.
  37 const char kAutocompleteDynamicFieldTrialPrefix[] = "AutocompleteDynamicTrial_";
  38 // The maximum number of the autocomplete dynamic field trials (aka layers).
  39 const int kMaxAutocompleteDynamicFieldTrials = 5;
  40
  41
  42 // Concatenates the autocomplete dynamic field trial prefix with a field trial
  43 // ID to form a complete autocomplete field trial name.
  44 std::string DynamicFieldTrialName(int id) {
  45   return base::StringPrintf("%s%d", kAutocompleteDynamicFieldTrialPrefix, id);
  46 }
  47
  48 void InitializeScoreBuckets(const VariationParams& params,
  49                             const char* relevance_cap_param,
  50                             const char* half_life_param,
  51                             const char* score_buckets_param,
  52                             ScoreBuckets* score_buckets) {
  53   VariationParams::const_iterator it = params.find(relevance_cap_param);
  54   if (it != params.end()) {
  55     int relevance_cap;
  56     if (base::StringToInt(it->second, &relevance_cap))
  57       score_buckets->set_relevance_cap(relevance_cap);
  58   }
  59
  60   it = params.find(half_life_param);
  61   if (it != params.end()) {
  62     int half_life_days;
  63     if (base::StringToInt(it->second, &half_life_days))
  64       score_buckets->set_half_life_days(half_life_days);
  65   }
  66
  67   it = params.find(score_buckets_param);
  68   if (it != params.end()) {
  69     // The value of the score bucket is a comma-separated list of
  70     // {DecayedCount + ":" + MaxRelevance}.
  71     base::StringPairs kv_pairs;
  72     if (base::SplitStringIntoKeyValuePairs(it->second, ':', ',', &kv_pairs)) {
  73       for (base::StringPairs::const_iterator it = kv_pairs.begin();
  74            it != kv_pairs.end(); ++it) {
  75         ScoreBuckets::CountMaxRelevance bucket;
  76         base::StringToDouble(it->first, &bucket.first);
  77         base::StringToInt(it->second, &bucket.second);
  78         score_buckets->buckets().push_back(bucket);
  79       }
  80       std::sort(score_buckets->buckets().begin(),
  81                 score_buckets->buckets().end(),
  82                 std::greater<ScoreBuckets::CountMaxRelevance>());
  83     }
  84   }
  85 }
  86
  87 }  // namespace
  88
  89 HUPScoringParams::ScoreBuckets::ScoreBuckets()
  90     : relevance_cap_(-1),
  91       half_life_days_(-1) {
  92 }
  93
  94 HUPScoringParams::ScoreBuckets::~ScoreBuckets() {
  95 }
  96
  97 double HUPScoringParams::ScoreBuckets::HalfLifeTimeDecay(
  98     const base::TimeDelta& elapsed_time) const {
  99   double time_ms;
 100   if ((half_life_days_ <= 0) ||
 101       ((time_ms = elapsed_time.InMillisecondsF()) <= 0))
 102     return 1.0;
 103
 104   const double half_life_intervals =
 105       time_ms / base::TimeDelta::FromDays(half_life_days_).InMillisecondsF();
 106   return pow(2.0, -half_life_intervals);
 107 }
 108
 109 void OmniboxFieldTrial::ActivateDynamicTrials() {
 110   // Initialize all autocomplete dynamic field trials.  This method may be
 111   // called multiple times.
 112   for (int i = 0; i < kMaxAutocompleteDynamicFieldTrials; ++i)
 113     base::FieldTrialList::FindValue(DynamicFieldTrialName(i));
 114 }
 115
 116 int OmniboxFieldTrial::GetDisabledProviderTypes() {
 117   // Make sure that Autocomplete dynamic field trials are activated.  It's OK to
 118   // call this method multiple times.
 119   ActivateDynamicTrials();
 120
 121   // Look for group names in form of "DisabledProviders_<mask>" where "mask"
 122   // is a bitmap of disabled provider types (AutocompleteProvider::Type).
 123   int provider_types = 0;
 124   for (int i = 0; i < kMaxAutocompleteDynamicFieldTrials; ++i) {
 125     std::string group_name = base::FieldTrialList::FindFullName(
 126         DynamicFieldTrialName(i));
 127     const char kDisabledProviders[] = "DisabledProviders_";
 128     if (!StartsWithASCII(group_name, kDisabledProviders, true))
 129       continue;
 130     int types = 0;
 131     if (!base::StringToInt(base::StringPiece(
 132             group_name.substr(strlen(kDisabledProviders))), &types))
 133       continue;
 134     provider_types |= types;
 135   }
 136   return provider_types;
 137 }
 138
 139 void OmniboxFieldTrial::GetActiveSuggestFieldTrialHashes(
 140     std::vector<uint32>* field_trial_hashes) {
 141   field_trial_hashes->clear();
 142   for (int i = 0; i < kMaxAutocompleteDynamicFieldTrials; ++i) {
 143     const std::string& trial_name = DynamicFieldTrialName(i);
 144     if (base::FieldTrialList::TrialExists(trial_name))
 145       field_trial_hashes->push_back(metrics::HashName(trial_name));
 146   }
 147   if (base::FieldTrialList::TrialExists(kBundledExperimentFieldTrialName)) {
 148     field_trial_hashes->push_back(
 149         metrics::HashName(kBundledExperimentFieldTrialName));
 150   }
 151 }
 152
 153 base::TimeDelta OmniboxFieldTrial::StopTimerFieldTrialDuration() {
 154   int stop_timer_ms;
 155   if (base::StringToInt(
 156       base::FieldTrialList::FindFullName(kStopTimerFieldTrialName),
 157           &stop_timer_ms))
 158     return base::TimeDelta::FromMilliseconds(stop_timer_ms);
 159   return base::TimeDelta::FromMilliseconds(1500);
 160 }
 161
 162 bool OmniboxFieldTrial::InZeroSuggestFieldTrial() {
 163   if (variations::GetVariationParamValue(
 164           kBundledExperimentFieldTrialName, kZeroSuggestRule) == "true")
 165     return true;
 166   if (variations::GetVariationParamValue(
 167           kBundledExperimentFieldTrialName, kZeroSuggestRule) == "false")
 168     return false;
 169 #if defined(OS_WIN) || defined(OS_CHROMEOS) || defined(OS_LINUX) || \
 170     (defined(OS_MACOSX) && !defined(OS_IOS))
 171   return true;
 172 #else
 173   return false;
 174 #endif
 175 }
 176
 177 bool OmniboxFieldTrial::InZeroSuggestMostVisitedFieldTrial() {
 178   return variations::GetVariationParamValue(
 179       kBundledExperimentFieldTrialName,
 180       kZeroSuggestVariantRule) == "MostVisited";
 181 }
 182
 183 bool OmniboxFieldTrial::InZeroSuggestAfterTypingFieldTrial() {
 184   return variations::GetVariationParamValue(
 185       kBundledExperimentFieldTrialName,
 186       kZeroSuggestVariantRule) == "AfterTyping";
 187 }
 188
 189 bool OmniboxFieldTrial::InZeroSuggestPersonalizedFieldTrial() {
 190   return variations::GetVariationParamValue(
 191       kBundledExperimentFieldTrialName,
 192       kZeroSuggestVariantRule) == "Personalized";
 193 }
 194
 195 bool OmniboxFieldTrial::ShortcutsScoringMaxRelevance(
 196     OmniboxEventProto::PageClassification current_page_classification,
 197     int* max_relevance) {
 198   // The value of the rule is a string that encodes an integer containing
 199   // the max relevance.
 200   const std::string& max_relevance_str =
 201       OmniboxFieldTrial::GetValueForRuleInContext(
 202           kShortcutsScoringMaxRelevanceRule, current_page_classification);
 203   if (max_relevance_str.empty())
 204     return false;
 205   if (!base::StringToInt(max_relevance_str, max_relevance))
 206     return false;
 207   return true;
 208 }
 209
 210 bool OmniboxFieldTrial::SearchHistoryPreventInlining(
 211     OmniboxEventProto::PageClassification current_page_classification) {
 212   return OmniboxFieldTrial::GetValueForRuleInContext(
 213       kSearchHistoryRule, current_page_classification) == "PreventInlining";
 214 }
 215
 216 bool OmniboxFieldTrial::SearchHistoryDisable(
 217     OmniboxEventProto::PageClassification current_page_classification) {
 218   return OmniboxFieldTrial::GetValueForRuleInContext(
 219       kSearchHistoryRule, current_page_classification) == "Disable";
 220 }
 221
 222 void OmniboxFieldTrial::GetDemotionsByType(
 223     OmniboxEventProto::PageClassification current_page_classification,
 224     DemotionMultipliers* demotions_by_type) {
 225   demotions_by_type->clear();
 226   std::string demotion_rule = OmniboxFieldTrial::GetValueForRuleInContext(
 227       kDemoteByTypeRule, current_page_classification);
 228   // If there is no demotion rule for this context, then use the default
 229   // value for that context.  At the moment the default value is non-empty
 230   // only for the fakebox-focus context.
 231   if (demotion_rule.empty() &&
 232       (current_page_classification ==
 233        OmniboxEventProto::INSTANT_NTP_WITH_FAKEBOX_AS_STARTING_FOCUS))
 234     demotion_rule = "1:61,2:61,3:61,4:61,16:61";
 235
 236   // The value of the DemoteByType rule is a comma-separated list of
 237   // {ResultType + ":" + Number} where ResultType is an AutocompleteMatchType::
 238   // Type enum represented as an integer and Number is an integer number
 239   // between 0 and 100 inclusive.   Relevance scores of matches of that result
 240   // type are multiplied by Number / 100.  100 means no change.
 241   base::StringPairs kv_pairs;
 242   if (base::SplitStringIntoKeyValuePairs(demotion_rule, ':', ',', &kv_pairs)) {
 243     for (base::StringPairs::const_iterator it = kv_pairs.begin();
 244          it != kv_pairs.end(); ++it) {
 245       // This is a best-effort conversion; we trust the hand-crafted parameters
 246       // downloaded from the server to be perfect.  There's no need to handle
 247       // errors smartly.
 248       int k, v;
 249       base::StringToInt(it->first, &k);
 250       base::StringToInt(it->second, &v);
 251       (*demotions_by_type)[static_cast<AutocompleteMatchType::Type>(k)] =
 252           static_cast<float>(v) / 100.0f;
 253     }
 254   }
 255 }
 256
 257 void OmniboxFieldTrial::GetExperimentalHUPScoringParams(
 258     HUPScoringParams* scoring_params) {
 259   scoring_params->experimental_scoring_enabled = false;
 260
 261   VariationParams params;
 262   if (!variations::GetVariationParams(kBundledExperimentFieldTrialName,
 263                                       &params))
 264     return;
 265
 266   VariationParams::const_iterator it = params.find(kHUPNewScoringEnabledParam);
 267   if (it != params.end()) {
 268     int enabled = 0;
 269     if (base::StringToInt(it->second, &enabled))
 270       scoring_params->experimental_scoring_enabled = (enabled != 0);
 271   }
 272
 273   InitializeScoreBuckets(params, kHUPNewScoringTypedCountRelevanceCapParam,
 274       kHUPNewScoringTypedCountHalfLifeTimeParam,
 275       kHUPNewScoringTypedCountScoreBucketsParam,
 276       &scoring_params->typed_count_buckets);
 277   InitializeScoreBuckets(params, kHUPNewScoringVisitedCountRelevanceCapParam,
 278       kHUPNewScoringVisitedCountHalfLifeTimeParam,
 279       kHUPNewScoringVisitedCountScoreBucketsParam,
 280       &scoring_params->visited_count_buckets);
 281 }
 282
 283 int OmniboxFieldTrial::HQPBookmarkValue() {
 284   std::string bookmark_value_str =
 285       variations::GetVariationParamValue(kBundledExperimentFieldTrialName,
 286                                          kHQPBookmarkValueRule);
 287   if (bookmark_value_str.empty())
 288     return 10;
 289   // This is a best-effort conversion; we trust the hand-crafted parameters
 290   // downloaded from the server to be perfect.  There's no need for handle
 291   // errors smartly.
 292   int bookmark_value;
 293   base::StringToInt(bookmark_value_str, &bookmark_value);
 294   return bookmark_value;
 295 }
 296
 297 bool OmniboxFieldTrial::HQPAllowMatchInTLDValue() {
 298   return variations::GetVariationParamValue(
 299       kBundledExperimentFieldTrialName,
 300       kHQPAllowMatchInTLDRule) == "true";
 301 }
 302
 303 bool OmniboxFieldTrial::HQPAllowMatchInSchemeValue() {
 304   return variations::GetVariationParamValue(
 305       kBundledExperimentFieldTrialName,
 306       kHQPAllowMatchInSchemeRule) == "true";
 307 }
 308
 309 bool OmniboxFieldTrial::BookmarksIndexURLsValue() {
 310   return variations::GetVariationParamValue(
 311       kBundledExperimentFieldTrialName,
 312       kBookmarksIndexURLsRule) == "true";
 313 }
 314
 315 bool OmniboxFieldTrial::DisableInlining() {
 316   return variations::GetVariationParamValue(
 317       kBundledExperimentFieldTrialName,
 318       kDisableInliningRule) == "true";
 319 }
 320
 321 bool OmniboxFieldTrial::EnableAnswersInSuggest() {
 322   const CommandLine* cl = CommandLine::ForCurrentProcess();
 323   if (cl->HasSwitch(switches::kDisableAnswersInSuggest))
 324     return false;
 325   if (cl->HasSwitch(switches::kEnableAnswersInSuggest))
 326     return true;
 327
 328   return variations::GetVariationParamValue(
 329       kBundledExperimentFieldTrialName,
 330       kAnswersInSuggestRule) == "true";
 331 }
 332
 333 bool OmniboxFieldTrial::AddUWYTMatchEvenIfPromotedURLs() {
 334   return variations::GetVariationParamValue(
 335       kBundledExperimentFieldTrialName,
 336       kAddUWYTMatchEvenIfPromotedURLsRule) == "true";
 337 }
 338
 339 bool OmniboxFieldTrial::DisplayHintTextWhenPossible() {
 340   return variations::GetVariationParamValue(
 341       kBundledExperimentFieldTrialName,
 342       kDisplayHintTextWhenPossibleRule) == "true";
 343 }
 344
 345 const char OmniboxFieldTrial::kBundledExperimentFieldTrialName[] =
 346     "OmniboxBundledExperimentV1";
 347 const char OmniboxFieldTrial::kShortcutsScoringMaxRelevanceRule[] =
 348     "ShortcutsScoringMaxRelevance";
 349 const char OmniboxFieldTrial::kSearchHistoryRule[] = "SearchHistory";
 350 const char OmniboxFieldTrial::kDemoteByTypeRule[] = "DemoteByType";
 351 const char OmniboxFieldTrial::kHQPBookmarkValueRule[] =
 352     "HQPBookmarkValue";
 353 const char OmniboxFieldTrial::kHQPAllowMatchInTLDRule[] = "HQPAllowMatchInTLD";
 354 const char OmniboxFieldTrial::kHQPAllowMatchInSchemeRule[] =
 355     "HQPAllowMatchInScheme";
 356 const char OmniboxFieldTrial::kZeroSuggestRule[] = "ZeroSuggest";
 357 const char OmniboxFieldTrial::kZeroSuggestVariantRule[] = "ZeroSuggestVariant";
 358 const char OmniboxFieldTrial::kBookmarksIndexURLsRule[] = "BookmarksIndexURLs";
 359 const char OmniboxFieldTrial::kDisableInliningRule[] = "DisableInlining";
 360 const char OmniboxFieldTrial::kAnswersInSuggestRule[] = "AnswersInSuggest";
 361 const char OmniboxFieldTrial::kAddUWYTMatchEvenIfPromotedURLsRule[] =
 362     "AddUWYTMatchEvenIfPromotedURLs";
 363 const char OmniboxFieldTrial::kDisplayHintTextWhenPossibleRule[] =
 364     "DisplayHintTextWhenPossible";
 365
 366 const char OmniboxFieldTrial::kHUPNewScoringEnabledParam[] =
 367     "HUPExperimentalScoringEnabled";
 368 const char OmniboxFieldTrial::kHUPNewScoringTypedCountRelevanceCapParam[] =
 369     "TypedCountRelevanceCap";
 370 const char OmniboxFieldTrial::kHUPNewScoringTypedCountHalfLifeTimeParam[] =
 371     "TypedCountHalfLifeTime";
 372 const char OmniboxFieldTrial::kHUPNewScoringTypedCountScoreBucketsParam[] =
 373     "TypedCountScoreBuckets";
 374 const char OmniboxFieldTrial::kHUPNewScoringVisitedCountRelevanceCapParam[] =
 375     "VisitedCountRelevanceCap";
 376 const char OmniboxFieldTrial::kHUPNewScoringVisitedCountHalfLifeTimeParam[] =
 377     "VisitedCountHalfLifeTime";
 378 const char OmniboxFieldTrial::kHUPNewScoringVisitedCountScoreBucketsParam[] =
 379     "VisitedCountScoreBuckets";
 380
 381 // Background and implementation details:
 382 //
 383 // Each experiment group in any field trial can come with an optional set of
 384 // parameters (key-value pairs).  In the bundled omnibox experiment
 385 // (kBundledExperimentFieldTrialName), each experiment group comes with a
 386 // list of parameters in the form:
 387 //   key=<Rule>:
 388 //       <OmniboxEventProto::PageClassification (as an int)>:
 389 //       <whether Instant Extended is enabled (as a 1 or 0)>
 390 //     (note that there are no linebreaks in keys; this format is for
 391 //      presentation only>
 392 //   value=<arbitrary string>
 393 // Both the OmniboxEventProto::PageClassification and the Instant Extended
 394 // entries can be "*", which means this rule applies for all values of the
 395 // matching portion of the context.
 396 // One example parameter is
 397 //   key=SearchHistory:6:1
 398 //   value=PreventInlining
 399 // This means in page classification context 6 (a search result page doing
 400 // search term replacement) with Instant Extended enabled, the SearchHistory
 401 // experiment should PreventInlining.
 402 //
 403 // When an exact match to the rule in the current context is missing, we
 404 // give preference to a wildcard rule that matches the instant extended
 405 // context over a wildcard rule that matches the page classification
 406 // context.  Hopefully, though, users will write their field trial configs
 407 // so as not to rely on this fall back order.
 408 //
 409 // In short, this function tries to find the value associated with key
 410 // |rule|:|page_classification|:|instant_extended|, failing that it looks up
 411 // |rule|:*:|instant_extended|, failing that it looks up
 412 // |rule|:|page_classification|:*, failing that it looks up |rule|:*:*,
 413 // and failing that it returns the empty string.
 414 std::string OmniboxFieldTrial::GetValueForRuleInContext(
 415     const std::string& rule,
 416     OmniboxEventProto::PageClassification page_classification) {
 417   VariationParams params;
 418   if (!variations::GetVariationParams(kBundledExperimentFieldTrialName,
 419                                       &params)) {
 420     return std::string();
 421   }
 422   const std::string page_classification_str =
 423       base::IntToString(static_cast<int>(page_classification));
 424   const std::string instant_extended =
 425       chrome::IsInstantExtendedAPIEnabled() ? "1" : "0";
 426   // Look up rule in this exact context.
 427   VariationParams::const_iterator it = params.find(
 428       rule + ":" + page_classification_str + ":" + instant_extended);
 429   if (it != params.end())
 430     return it->second;
 431   // Fall back to the global page classification context.
 432   it = params.find(rule + ":*:" + instant_extended);
 433   if (it != params.end())
 434     return it->second;
 435   // Fall back to the global instant extended context.
 436   it = params.find(rule + ":" + page_classification_str + ":*");
 437   if (it != params.end())
 438     return it->second;
 439   // Look up rule in the global context.
 440   it = params.find(rule + ":*:*");
 441   return (it != params.end()) ? it->second : std::string();
 442 }