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 // This file defines a set of user experience metrics data recorded by
6 // the MetricsService. This is the unit of data that is sent to the server.
8 #ifndef COMPONENTS_METRICS_METRICS_LOG_H_
9 #define COMPONENTS_METRICS_METRICS_LOG_H_
14 #include "base/basictypes.h"
15 #include "base/time/time.h"
16 #include "components/metrics/proto/chrome_user_metrics_extension.pb.h"
18 class PrefRegistrySimple;
22 class DictionaryValue;
23 class HistogramSamples;
31 class MetricsProvider;
32 class MetricsServiceClient;
35 namespace tracked_objects {
36 struct ProcessDataSnapshot;
39 namespace variations {
46 INITIAL_STABILITY_LOG, // The initial log containing stability stats.
47 ONGOING_LOG, // Subsequent logs in a session.
50 // Creates a new metrics log of the specified type.
51 // |client_id| is the identifier for this profile on this installation
52 // |session_id| is an integer that's incremented on each application launch
53 // |client| is used to interact with the embedder.
54 // |local_state| is the PrefService that this instance should use.
55 // Note: |this| instance does not take ownership of the |client|, but rather
56 // stores a weak pointer to it. The caller should ensure that the |client| is
57 // valid for the lifetime of this class.
58 MetricsLog(const std::string& client_id,
61 metrics::MetricsServiceClient* client,
62 PrefService* local_state);
63 virtual ~MetricsLog();
65 // Registers local state prefs used by this class.
66 static void RegisterPrefs(PrefRegistrySimple* registry);
68 // Computes the MD5 hash of the given string, and returns the first 8 bytes of
70 static uint64 Hash(const std::string& value);
72 // Get the GMT buildtime for the current binary, expressed in seconds since
73 // January 1, 1970 GMT.
74 // The value is used to identify when a new build is run, so that previous
75 // reliability stats, from other builds, can be abandoned.
76 static int64 GetBuildTime();
78 // Convenience function to return the current time at a resolution in seconds.
79 // This wraps base::TimeTicks, and hence provides an abstract time that is
80 // always incrementing for use in measuring time durations.
81 static int64 GetCurrentTime();
83 // Records a user-initiated action.
84 void RecordUserAction(const std::string& key);
86 // Record any changes in a given histogram for transmission.
87 void RecordHistogramDelta(const std::string& histogram_name,
88 const base::HistogramSamples& snapshot);
90 // Records the current operating environment, including metrics provided by
91 // the specified set of |metrics_providers|. Takes the list of installed
92 // plugins, Google Update statistics, and synthetic trial IDs as parameters
93 // because those can't be obtained synchronously from the UI thread.
94 // A synthetic trial is one that is set up dynamically by code in Chrome. For
95 // example, a pref may be mapped to a synthetic trial such that the group
96 // is determined by the pref value.
97 void RecordEnvironment(
98 const std::vector<metrics::MetricsProvider*>& metrics_providers,
99 const std::vector<variations::ActiveGroupId>& synthetic_trials);
101 // Loads the environment proto that was saved by the last RecordEnvironment()
102 // call from prefs and clears the pref value. Returns true on success or false
103 // if there was no saved environment in prefs or it could not be decoded.
104 bool LoadSavedEnvironmentFromPrefs();
106 // Writes application stability metrics, including stability metrics provided
107 // by the specified set of |metrics_providers|. The system profile portion of
108 // the log must have already been filled in by a call to RecordEnvironment()
109 // or LoadSavedEnvironmentFromPrefs().
110 // NOTE: Has the side-effect of clearing the stability prefs..
112 // If this log is of type INITIAL_STABILITY_LOG, records additional info such
113 // as number of incomplete shutdowns as well as extra breakpad and debugger
115 void RecordStabilityMetrics(
116 const std::vector<metrics::MetricsProvider*>& metrics_providers,
117 base::TimeDelta incremental_uptime,
118 base::TimeDelta uptime);
120 // Records general metrics based on the specified |metrics_providers|.
121 void RecordGeneralMetrics(
122 const std::vector<metrics::MetricsProvider*>& metrics_providers);
124 // Stop writing to this record and generate the encoded representation.
125 // None of the Record* methods can be called after this is called.
128 // Fills |encoded_log| with the serialized protobuf representation of the
129 // record. Must only be called after CloseLog() has been called.
130 void GetEncodedLog(std::string* encoded_log);
132 const base::TimeTicks& creation_time() const {
133 return creation_time_;
136 int num_events() const {
137 return uma_proto_.omnibox_event_size() +
138 uma_proto_.user_action_event_size();
141 LogType log_type() const { return log_type_; }
144 // Exposed for the sake of mocking/accessing in test code.
146 // Fills |field_trial_ids| with the list of initialized field trials name and
148 virtual void GetFieldTrialIds(
149 std::vector<variations::ActiveGroupId>* field_trial_ids) const;
151 metrics::ChromeUserMetricsExtension* uma_proto() { return &uma_proto_; }
152 const metrics::ChromeUserMetricsExtension* uma_proto() const {
157 // Returns true if the environment has already been filled in by a call to
158 // RecordEnvironment() or LoadSavedEnvironmentFromPrefs().
159 bool HasEnvironment() const;
161 // Returns true if the stability metrics have already been filled in by a
162 // call to RecordStabilityMetrics().
163 bool HasStabilityMetrics() const;
165 // Within the stability group, write required attributes.
166 void WriteRequiredStabilityAttributes(PrefService* pref);
168 // Within the stability group, write attributes that need to be updated asap
169 // and can't be delayed until the user decides to restart chromium.
170 // Delaying these stats would bias metrics away from happy long lived
171 // chromium processes (ones that don't crash, and keep on running).
172 void WriteRealtimeStabilityAttributes(PrefService* pref,
173 base::TimeDelta incremental_uptime,
174 base::TimeDelta uptime);
176 // closed_ is true when record has been packed up for sending, and should
177 // no longer be written to. It is only used for sanity checking.
180 // The type of the log, i.e. initial or ongoing.
181 const LogType log_type_;
183 // Stores the protocol buffer representation for this log.
184 metrics::ChromeUserMetricsExtension uma_proto_;
186 // Used to interact with the embedder. Weak pointer; must outlive |this|
188 metrics::MetricsServiceClient* const client_;
190 // The time when the current log was created.
191 const base::TimeTicks creation_time_;
193 PrefService* local_state_;
195 DISALLOW_COPY_AND_ASSIGN(MetricsLog);
198 #endif // COMPONENTS_METRICS_METRICS_LOG_H_