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.
5 #include "components/omnibox/omnibox_field_trial.h"
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"
24 using metrics::OmniboxEventProto
;
28 typedef std::map
<std::string
, std::string
> VariationParams
;
29 typedef HUPScoringParams::ScoreBuckets ScoreBuckets
;
32 const char kStopTimerFieldTrialName
[] = "OmniboxStopTimer";
34 // The autocomplete dynamic field trial name prefix. Each field trial is
35 // configured dynamically and is retrieved automatically by Chrome during
37 const char kAutocompleteDynamicFieldTrialPrefix
[] = "AutocompleteDynamicTrial_";
38 // The maximum number of the autocomplete dynamic field trials (aka layers).
39 const int kMaxAutocompleteDynamicFieldTrials
= 5;
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
);
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()) {
56 if (base::StringToInt(it
->second
, &relevance_cap
))
57 score_buckets
->set_relevance_cap(relevance_cap
);
60 it
= params
.find(half_life_param
);
61 if (it
!= params
.end()) {
63 if (base::StringToInt(it
->second
, &half_life_days
))
64 score_buckets
->set_half_life_days(half_life_days
);
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
);
80 std::sort(score_buckets
->buckets().begin(),
81 score_buckets
->buckets().end(),
82 std::greater
<ScoreBuckets::CountMaxRelevance
>());
89 HUPScoringParams::ScoreBuckets::ScoreBuckets()
94 HUPScoringParams::ScoreBuckets::~ScoreBuckets() {
97 double HUPScoringParams::ScoreBuckets::HalfLifeTimeDecay(
98 const base::TimeDelta
& elapsed_time
) const {
100 if ((half_life_days_
<= 0) ||
101 ((time_ms
= elapsed_time
.InMillisecondsF()) <= 0))
104 const double half_life_intervals
=
105 time_ms
/ base::TimeDelta::FromDays(half_life_days_
).InMillisecondsF();
106 return pow(2.0, -half_life_intervals
);
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
));
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();
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))
131 if (!base::StringToInt(base::StringPiece(
132 group_name
.substr(strlen(kDisabledProviders
))), &types
))
134 provider_types
|= types
;
136 return provider_types
;
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
));
147 if (base::FieldTrialList::TrialExists(kBundledExperimentFieldTrialName
)) {
148 field_trial_hashes
->push_back(
149 metrics::HashName(kBundledExperimentFieldTrialName
));
153 base::TimeDelta
OmniboxFieldTrial::StopTimerFieldTrialDuration() {
155 if (base::StringToInt(
156 base::FieldTrialList::FindFullName(kStopTimerFieldTrialName
),
158 return base::TimeDelta::FromMilliseconds(stop_timer_ms
);
159 return base::TimeDelta::FromMilliseconds(1500);
162 bool OmniboxFieldTrial::InZeroSuggestFieldTrial() {
163 if (variations::GetVariationParamValue(
164 kBundledExperimentFieldTrialName
, kZeroSuggestRule
) == "true")
166 if (variations::GetVariationParamValue(
167 kBundledExperimentFieldTrialName
, kZeroSuggestRule
) == "false")
169 #if defined(OS_WIN) || defined(OS_CHROMEOS) || defined(OS_LINUX) || \
170 (defined(OS_MACOSX) && !defined(OS_IOS))
177 bool OmniboxFieldTrial::InZeroSuggestMostVisitedFieldTrial() {
178 return InZeroSuggestMostVisitedWithoutSerpFieldTrial() ||
179 variations::GetVariationParamValue(
180 kBundledExperimentFieldTrialName
,
181 kZeroSuggestVariantRule
) == "MostVisited";
184 bool OmniboxFieldTrial::InZeroSuggestMostVisitedWithoutSerpFieldTrial() {
185 return variations::GetVariationParamValue(
186 kBundledExperimentFieldTrialName
,
187 kZeroSuggestVariantRule
) == "MostVisitedWithoutSERP";
190 bool OmniboxFieldTrial::InZeroSuggestAfterTypingFieldTrial() {
191 return variations::GetVariationParamValue(
192 kBundledExperimentFieldTrialName
,
193 kZeroSuggestVariantRule
) == "AfterTyping";
196 bool OmniboxFieldTrial::InZeroSuggestPersonalizedFieldTrial() {
197 return variations::GetVariationParamValue(
198 kBundledExperimentFieldTrialName
,
199 kZeroSuggestVariantRule
) == "Personalized";
202 bool OmniboxFieldTrial::ShortcutsScoringMaxRelevance(
203 OmniboxEventProto::PageClassification current_page_classification
,
204 int* max_relevance
) {
205 // The value of the rule is a string that encodes an integer containing
206 // the max relevance.
207 const std::string
& max_relevance_str
=
208 OmniboxFieldTrial::GetValueForRuleInContext(
209 kShortcutsScoringMaxRelevanceRule
, current_page_classification
);
210 if (max_relevance_str
.empty())
212 if (!base::StringToInt(max_relevance_str
, max_relevance
))
217 bool OmniboxFieldTrial::SearchHistoryPreventInlining(
218 OmniboxEventProto::PageClassification current_page_classification
) {
219 return OmniboxFieldTrial::GetValueForRuleInContext(
220 kSearchHistoryRule
, current_page_classification
) == "PreventInlining";
223 bool OmniboxFieldTrial::SearchHistoryDisable(
224 OmniboxEventProto::PageClassification current_page_classification
) {
225 return OmniboxFieldTrial::GetValueForRuleInContext(
226 kSearchHistoryRule
, current_page_classification
) == "Disable";
229 void OmniboxFieldTrial::GetDemotionsByType(
230 OmniboxEventProto::PageClassification current_page_classification
,
231 DemotionMultipliers
* demotions_by_type
) {
232 demotions_by_type
->clear();
233 std::string demotion_rule
= OmniboxFieldTrial::GetValueForRuleInContext(
234 kDemoteByTypeRule
, current_page_classification
);
235 // If there is no demotion rule for this context, then use the default
236 // value for that context. At the moment the default value is non-empty
237 // only for the fakebox-focus context.
238 if (demotion_rule
.empty() &&
239 (current_page_classification
==
240 OmniboxEventProto::INSTANT_NTP_WITH_FAKEBOX_AS_STARTING_FOCUS
))
241 demotion_rule
= "1:61,2:61,3:61,4:61,16:61";
243 // The value of the DemoteByType rule is a comma-separated list of
244 // {ResultType + ":" + Number} where ResultType is an AutocompleteMatchType::
245 // Type enum represented as an integer and Number is an integer number
246 // between 0 and 100 inclusive. Relevance scores of matches of that result
247 // type are multiplied by Number / 100. 100 means no change.
248 base::StringPairs kv_pairs
;
249 if (base::SplitStringIntoKeyValuePairs(demotion_rule
, ':', ',', &kv_pairs
)) {
250 for (base::StringPairs::const_iterator it
= kv_pairs
.begin();
251 it
!= kv_pairs
.end(); ++it
) {
252 // This is a best-effort conversion; we trust the hand-crafted parameters
253 // downloaded from the server to be perfect. There's no need to handle
256 base::StringToInt(it
->first
, &k
);
257 base::StringToInt(it
->second
, &v
);
258 (*demotions_by_type
)[static_cast<AutocompleteMatchType::Type
>(k
)] =
259 static_cast<float>(v
) / 100.0f
;
264 void OmniboxFieldTrial::GetExperimentalHUPScoringParams(
265 HUPScoringParams
* scoring_params
) {
266 scoring_params
->experimental_scoring_enabled
= false;
268 VariationParams params
;
269 if (!variations::GetVariationParams(kBundledExperimentFieldTrialName
,
273 VariationParams::const_iterator it
= params
.find(kHUPNewScoringEnabledParam
);
274 if (it
!= params
.end()) {
276 if (base::StringToInt(it
->second
, &enabled
))
277 scoring_params
->experimental_scoring_enabled
= (enabled
!= 0);
280 InitializeScoreBuckets(params
, kHUPNewScoringTypedCountRelevanceCapParam
,
281 kHUPNewScoringTypedCountHalfLifeTimeParam
,
282 kHUPNewScoringTypedCountScoreBucketsParam
,
283 &scoring_params
->typed_count_buckets
);
284 InitializeScoreBuckets(params
, kHUPNewScoringVisitedCountRelevanceCapParam
,
285 kHUPNewScoringVisitedCountHalfLifeTimeParam
,
286 kHUPNewScoringVisitedCountScoreBucketsParam
,
287 &scoring_params
->visited_count_buckets
);
290 int OmniboxFieldTrial::HQPBookmarkValue() {
291 std::string bookmark_value_str
=
292 variations::GetVariationParamValue(kBundledExperimentFieldTrialName
,
293 kHQPBookmarkValueRule
);
294 if (bookmark_value_str
.empty())
296 // This is a best-effort conversion; we trust the hand-crafted parameters
297 // downloaded from the server to be perfect. There's no need for handle
300 base::StringToInt(bookmark_value_str
, &bookmark_value
);
301 return bookmark_value
;
304 bool OmniboxFieldTrial::HQPAllowMatchInTLDValue() {
305 return variations::GetVariationParamValue(
306 kBundledExperimentFieldTrialName
,
307 kHQPAllowMatchInTLDRule
) == "true";
310 bool OmniboxFieldTrial::HQPAllowMatchInSchemeValue() {
311 return variations::GetVariationParamValue(
312 kBundledExperimentFieldTrialName
,
313 kHQPAllowMatchInSchemeRule
) == "true";
316 bool OmniboxFieldTrial::DisableInlining() {
317 return variations::GetVariationParamValue(
318 kBundledExperimentFieldTrialName
,
319 kDisableInliningRule
) == "true";
322 bool OmniboxFieldTrial::EnableAnswersInSuggest() {
323 const CommandLine
* cl
= CommandLine::ForCurrentProcess();
324 if (cl
->HasSwitch(switches::kDisableAnswersInSuggest
))
326 if (cl
->HasSwitch(switches::kEnableAnswersInSuggest
))
329 return variations::GetVariationParamValue(
330 kBundledExperimentFieldTrialName
,
331 kAnswersInSuggestRule
) == "true";
334 bool OmniboxFieldTrial::AddUWYTMatchEvenIfPromotedURLs() {
335 return variations::GetVariationParamValue(
336 kBundledExperimentFieldTrialName
,
337 kAddUWYTMatchEvenIfPromotedURLsRule
) == "true";
340 bool OmniboxFieldTrial::DisplayHintTextWhenPossible() {
341 return variations::GetVariationParamValue(
342 kBundledExperimentFieldTrialName
,
343 kDisplayHintTextWhenPossibleRule
) == "true";
346 bool OmniboxFieldTrial::DisableResultsCaching() {
347 return variations::GetVariationParamValue(
348 kBundledExperimentFieldTrialName
,
349 kDisableResultsCachingRule
) == "true";
352 void OmniboxFieldTrial::GetSuggestPollingStrategy(bool* from_last_keystroke
,
353 int* polling_delay_ms
) {
354 *from_last_keystroke
= variations::GetVariationParamValue(
355 kBundledExperimentFieldTrialName
,
356 kMeasureSuggestPollingDelayFromLastKeystrokeRule
) == "true";
358 const std::string
& polling_delay_string
= variations::GetVariationParamValue(
359 kBundledExperimentFieldTrialName
,
360 kSuggestPollingDelayMsRule
);
361 if (polling_delay_string
.empty() ||
362 !base::StringToInt(polling_delay_string
, polling_delay_ms
) ||
363 (*polling_delay_ms
<= 0)) {
364 *polling_delay_ms
= kDefaultMinimumTimeBetweenSuggestQueriesMs
;
368 const char OmniboxFieldTrial::kBundledExperimentFieldTrialName
[] =
369 "OmniboxBundledExperimentV1";
370 const char OmniboxFieldTrial::kShortcutsScoringMaxRelevanceRule
[] =
371 "ShortcutsScoringMaxRelevance";
372 const char OmniboxFieldTrial::kSearchHistoryRule
[] = "SearchHistory";
373 const char OmniboxFieldTrial::kDemoteByTypeRule
[] = "DemoteByType";
374 const char OmniboxFieldTrial::kHQPBookmarkValueRule
[] =
376 const char OmniboxFieldTrial::kHQPAllowMatchInTLDRule
[] = "HQPAllowMatchInTLD";
377 const char OmniboxFieldTrial::kHQPAllowMatchInSchemeRule
[] =
378 "HQPAllowMatchInScheme";
379 const char OmniboxFieldTrial::kZeroSuggestRule
[] = "ZeroSuggest";
380 const char OmniboxFieldTrial::kZeroSuggestVariantRule
[] = "ZeroSuggestVariant";
381 const char OmniboxFieldTrial::kDisableInliningRule
[] = "DisableInlining";
382 const char OmniboxFieldTrial::kAnswersInSuggestRule
[] = "AnswersInSuggest";
383 const char OmniboxFieldTrial::kAddUWYTMatchEvenIfPromotedURLsRule
[] =
384 "AddUWYTMatchEvenIfPromotedURLs";
385 const char OmniboxFieldTrial::kDisplayHintTextWhenPossibleRule
[] =
386 "DisplayHintTextWhenPossible";
387 const char OmniboxFieldTrial::kDisableResultsCachingRule
[] =
388 "DisableResultsCaching";
390 OmniboxFieldTrial::kMeasureSuggestPollingDelayFromLastKeystrokeRule
[] =
391 "MeasureSuggestPollingDelayFromLastKeystroke";
392 const char OmniboxFieldTrial::kSuggestPollingDelayMsRule
[] =
393 "SuggestPollingDelayMs";
395 const char OmniboxFieldTrial::kHUPNewScoringEnabledParam
[] =
396 "HUPExperimentalScoringEnabled";
397 const char OmniboxFieldTrial::kHUPNewScoringTypedCountRelevanceCapParam
[] =
398 "TypedCountRelevanceCap";
399 const char OmniboxFieldTrial::kHUPNewScoringTypedCountHalfLifeTimeParam
[] =
400 "TypedCountHalfLifeTime";
401 const char OmniboxFieldTrial::kHUPNewScoringTypedCountScoreBucketsParam
[] =
402 "TypedCountScoreBuckets";
403 const char OmniboxFieldTrial::kHUPNewScoringVisitedCountRelevanceCapParam
[] =
404 "VisitedCountRelevanceCap";
405 const char OmniboxFieldTrial::kHUPNewScoringVisitedCountHalfLifeTimeParam
[] =
406 "VisitedCountHalfLifeTime";
407 const char OmniboxFieldTrial::kHUPNewScoringVisitedCountScoreBucketsParam
[] =
408 "VisitedCountScoreBuckets";
411 int OmniboxFieldTrial::kDefaultMinimumTimeBetweenSuggestQueriesMs
= 100;
413 // Background and implementation details:
415 // Each experiment group in any field trial can come with an optional set of
416 // parameters (key-value pairs). In the bundled omnibox experiment
417 // (kBundledExperimentFieldTrialName), each experiment group comes with a
418 // list of parameters in the form:
420 // <OmniboxEventProto::PageClassification (as an int)>:
421 // <whether Instant Extended is enabled (as a 1 or 0)>
422 // (note that there are no linebreaks in keys; this format is for
423 // presentation only>
424 // value=<arbitrary string>
425 // Both the OmniboxEventProto::PageClassification and the Instant Extended
426 // entries can be "*", which means this rule applies for all values of the
427 // matching portion of the context.
428 // One example parameter is
429 // key=SearchHistory:6:1
430 // value=PreventInlining
431 // This means in page classification context 6 (a search result page doing
432 // search term replacement) with Instant Extended enabled, the SearchHistory
433 // experiment should PreventInlining.
435 // When an exact match to the rule in the current context is missing, we
436 // give preference to a wildcard rule that matches the instant extended
437 // context over a wildcard rule that matches the page classification
438 // context. Hopefully, though, users will write their field trial configs
439 // so as not to rely on this fall back order.
441 // In short, this function tries to find the value associated with key
442 // |rule|:|page_classification|:|instant_extended|, failing that it looks up
443 // |rule|:*:|instant_extended|, failing that it looks up
444 // |rule|:|page_classification|:*, failing that it looks up |rule|:*:*,
445 // and failing that it returns the empty string.
446 std::string
OmniboxFieldTrial::GetValueForRuleInContext(
447 const std::string
& rule
,
448 OmniboxEventProto::PageClassification page_classification
) {
449 VariationParams params
;
450 if (!variations::GetVariationParams(kBundledExperimentFieldTrialName
,
452 return std::string();
454 const std::string page_classification_str
=
455 base::IntToString(static_cast<int>(page_classification
));
456 const std::string instant_extended
=
457 chrome::IsInstantExtendedAPIEnabled() ? "1" : "0";
458 // Look up rule in this exact context.
459 VariationParams::const_iterator it
= params
.find(
460 rule
+ ":" + page_classification_str
+ ":" + instant_extended
);
461 if (it
!= params
.end())
463 // Fall back to the global page classification context.
464 it
= params
.find(rule
+ ":*:" + instant_extended
);
465 if (it
!= params
.end())
467 // Fall back to the global instant extended context.
468 it
= params
.find(rule
+ ":" + page_classification_str
+ ":*");
469 if (it
!= params
.end())
471 // Look up rule in the global context.
472 it
= params
.find(rule
+ ":*:*");
473 return (it
!= params
.end()) ? it
->second
: std::string();