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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_METRICS_VARIATIONS_SERVICE_H_
#define CHROME_BROWSER_METRICS_VARIATIONS_SERVICE_H_
#pragma once
#include <string>
#include "base/compiler_specific.h"
#include "base/gtest_prod_util.h"
#include "base/memory/scoped_ptr.h"
#include "base/metrics/field_trial.h"
#include "base/time.h"
#include "chrome/browser/metrics/proto/study.pb.h"
#include "chrome/browser/metrics/proto/trials_seed.pb.h"
#include "chrome/common/chrome_version_info.h"
#include "net/url_request/url_fetcher_delegate.h"
class PrefService;
namespace net {
class URLFetcher;
} // namespace net
// Used to setup field trials based on stored variations seed data, and fetch
// new seed data from the variations server.
class VariationsService : public net::URLFetcherDelegate {
public:
VariationsService();
virtual ~VariationsService();
// Creates field trials based on Variations Seed loaded from local prefs. If
// there is a problem loading the seed data, all trials specified by the seed
// may not be created.
bool CreateTrialsFromSeed(PrefService* local_prefs);
// Starts the fetching process, where |OnURLFetchComplete| is called with the
// response.
void StartFetchingVariationsSeed();
// net::URLFetcherDelegate implementation:
virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
// Register Variations related prefs in Local State.
static void RegisterPrefs(PrefService* prefs);
private:
FRIEND_TEST_ALL_PREFIXES(VariationsServiceTest, CheckStudyChannel);
FRIEND_TEST_ALL_PREFIXES(VariationsServiceTest, CheckStudyPlatform);
FRIEND_TEST_ALL_PREFIXES(VariationsServiceTest, CheckStudyVersion);
FRIEND_TEST_ALL_PREFIXES(VariationsServiceTest, CheckStudyVersionWildcards);
FRIEND_TEST_ALL_PREFIXES(VariationsServiceTest, CheckStudyStartDate);
FRIEND_TEST_ALL_PREFIXES(VariationsServiceTest, IsStudyExpired);
FRIEND_TEST_ALL_PREFIXES(VariationsServiceTest, ValidateStudy);
// Store the given seed data to the given local prefs. Note that |seed_data|
// is assumed to be the raw serialized protobuf data stored in a string. It
// will be Base64Encoded for storage. If the string is invalid or the encoding
// fails, the |local_prefs| is left as is.
void StoreSeedData(const std::string& seed_data,
const base::Time& seed_date,
PrefService* local_prefs);
// Returns whether |study| should be disabled according to its restriction
// parameters. Uses |version_info| for min / max version checks and
// |reference_date| for the start date check.
static bool ShouldAddStudy(const chrome_variations::Study& study,
const chrome::VersionInfo& version_info,
const base::Time& reference_date);
// Checks whether a study is applicable for the given |channel| per |filter|.
static bool CheckStudyChannel(const chrome_variations::Study_Filter& filter,
chrome::VersionInfo::Channel channel);
// Checks whether a study is applicable for the given |platform| per |filter|.
static bool CheckStudyPlatform(const chrome_variations::Study_Filter& filter,
chrome_variations::Study_Platform platform);
// Checks whether a study is applicable for the given version per |filter|.
static bool CheckStudyVersion(const chrome_variations::Study_Filter& filter,
const std::string& version_string);
// Checks whether a study is applicable for the given date/time per |filter|.
static bool CheckStudyStartDate(const chrome_variations::Study_Filter& filter,
const base::Time& date_time);
// Checks whether |study| is expired using the given date/time.
static bool IsStudyExpired(const chrome_variations::Study& study,
const base::Time& date_time);
// Validates the sanity of |study| and computes the total probability.
static bool ValidateStudyAndComputeTotalProbability(
const chrome_variations::Study& study,
base::FieldTrial::Probability* total_probability);
// Loads the Variations seed data from the given local prefs into |seed|. If
// there is a problem with loading, the pref value is cleared and false is
// returned. If successful, |seed| will contain the loaded data and true is
// returned.
bool LoadTrialsSeedFromPref(PrefService* local_prefs,
chrome_variations::TrialsSeed* seed);
// Creates and registers a field trial from the |study| data. Disables the
// trial if IsStudyExpired(study, reference_date) is true.
void CreateTrialFromStudy(const chrome_variations::Study& study,
const base::Time& reference_date);
// Contains the current seed request. Will only have a value while a request
// is pending, and will be reset by |OnURLFetchComplete|.
scoped_ptr<net::URLFetcher> pending_seed_request_;
};
#endif // CHROME_BROWSER_METRICS_VARIATIONS_SERVICE_H_
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