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// Copyright 2014 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 COMPONENTS_RAPPOR_RAPPOR_SERVICE_H_
#define COMPONENTS_RAPPOR_RAPPOR_SERVICE_H_
#include <map>
#include <string>
#include "base/basictypes.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/timer/timer.h"
class PrefRegistrySimple;
class PrefService;
namespace net {
class URLRequestContextGetter;
}
namespace rappor {
class LogUploader;
class RapporMetric;
class RapporReports;
struct RapporParameters;
// The type of data stored in a metric.
enum RapporType {
// For sampling the eTLD+1 of a URL.
ETLD_PLUS_ONE_RAPPOR_TYPE = 0,
NUM_RAPPOR_TYPES
};
// This class provides an interface for recording samples for rappor metrics,
// and periodically generates and uploads reports based on the collected data.
class RapporService {
public:
RapporService();
virtual ~RapporService();
// Starts the periodic generation of reports and upload attempts.
void Start(PrefService* pref_service, net::URLRequestContextGetter* context);
// Records a sample of the rappor metric specified by |metric_name|.
// Creates and initializes the metric, if it doesn't yet exist.
void RecordSample(const std::string& metric_name,
RapporType type,
const std::string& sample);
// Sets the cohort value. For use by tests only.
void SetCohortForTesting(uint32_t cohort) { cohort_ = cohort; }
// Sets the secret value. For use by tests only.
void SetSecretForTesting(const std::string& secret) { secret_ = secret; }
// Registers the names of all of the preferences used by RapporService in the
// provided PrefRegistry. This should be called before calling Start().
static void RegisterPrefs(PrefRegistrySimple* registry);
protected:
// Logs all of the collected metrics to the reports proto message and clears
// the internal map. Exposed for tests. Returns true if any metrics were
// recorded.
bool ExportMetrics(RapporReports* reports);
// Records a sample of the rappor metric specified by |parameters|.
// Creates and initializes the metric, if it doesn't yet exist.
// Exposed for tests.
void RecordSampleInternal(const std::string& metric_name,
const RapporParameters& parameters,
const std::string& sample);
private:
// Check if the service has been started successfully.
bool IsInitialized() const;
// Retrieves the cohort number this client was assigned to, generating it if
// doesn't already exist. The cohort should be persistent.
void LoadCohort(PrefService* pref_service);
// Retrieves the value for secret_ from preferences, generating it if doesn't
// already exist. The secret should be persistent, so that additional bits
// from the client do not get exposed over time.
void LoadSecret(PrefService* pref_service);
// Called whenever the logging interval elapses to generate a new log of
// reports and pass it to the uploader.
void OnLogInterval();
// Finds a metric in the metrics_map_, creating it if it doesn't already
// exist.
RapporMetric* LookUpMetric(const std::string& metric_name,
const RapporParameters& parameters);
// Client-side secret used to generate fake bits.
std::string secret_;
// The cohort this client is assigned to. -1 is uninitialized.
int32_t cohort_;
// Timer which schedules calls to OnLogInterval().
base::OneShotTimer<RapporService> log_rotation_timer_;
// A private LogUploader instance for sending reports to the server.
scoped_ptr<LogUploader> uploader_;
// We keep all registered metrics in a map, from name to metric.
// The map owns the metrics it contains.
std::map<std::string, RapporMetric*> metrics_map_;
DISALLOW_COPY_AND_ASSIGN(RapporService);
};
} // namespace rappor
#endif // COMPONENTS_RAPPOR_RAPPOR_SERVICE_H_
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