The Tor Browser: mobile/android/base/health/BrowserHealthRecorder.java@6474c204b198 (annotated)

mobile/android/base/health/BrowserHealthRecorder.java@6474c204b198 (annotated)

mobile/android/base/health/BrowserHealthRecorder.java

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 package org.mozilla.gecko.health;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.OutputStreamWriter;
 import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Scanner;
 import java.util.Set;
 import java.util.concurrent.atomic.AtomicBoolean;
 import org.json.JSONException;
 import org.json.JSONObject;
 import org.mozilla.gecko.AppConstants;
 import org.mozilla.gecko.Distribution;
 import org.mozilla.gecko.Distribution.DistributionDescriptor;
 import org.mozilla.gecko.EventDispatcher;
 import org.mozilla.gecko.GeckoAppShell;
 import org.mozilla.gecko.GeckoEvent;
 import org.mozilla.gecko.background.healthreport.EnvironmentBuilder;
 import org.mozilla.gecko.background.healthreport.HealthReportDatabaseStorage;
 import org.mozilla.gecko.background.healthreport.HealthReportStorage.Field;
 import org.mozilla.gecko.background.healthreport.HealthReportStorage.MeasurementFields;
 import org.mozilla.gecko.background.healthreport.ProfileInformationCache;
 import org.mozilla.gecko.util.GeckoEventListener;
 import org.mozilla.gecko.util.ThreadUtils;
 import android.content.ContentProviderClient;
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.util.Log;
 /**
  * BrowserHealthRecorder is the browser's interface to the Firefox Health
  * Report storage system. It manages environments (a collection of attributes
  * that are tracked longitudinally) on the browser's behalf, exposing a simpler
  * interface for recording changes.
  *
  * Keep an instance of this class around.
  *
  * Tell it when an environment attribute has changed: call {@link
  * #onAppLocaleChanged(String)} followed by {@link
  * #onEnvironmentChanged()}.
  *
  * Use it to record events: {@link #recordSearch(String, String)}.
  *
  * Shut it down when you're done being a browser: {@link #close()}.
  */
 public class BrowserHealthRecorder implements HealthRecorder, GeckoEventListener {
     private static final String LOG_TAG = "GeckoHealthRec";
     private static final String PREF_ACCEPT_LANG = "intl.accept_languages";
     private static final String PREF_BLOCKLIST_ENABLED = "extensions.blocklist.enabled";
     private static final String EVENT_SNAPSHOT = "HealthReport:Snapshot";
     private static final String EVENT_ADDONS_CHANGE = "Addons:Change";
     private static final String EVENT_ADDONS_UNINSTALLING = "Addons:Uninstalling";
     private static final String EVENT_PREF_CHANGE = "Pref:Change";
     // This is raised from Gecko and signifies a search via the URL bar (not a bookmarks keyword
     // search). Using this event (rather than passing the invocation location as an arg) avoids
     // browser.js having to know about the invocation location.
     public static final String EVENT_KEYWORD_SEARCH = "Search:Keyword";
     // This is raised from Java. We include the location in the message.
     public static final String EVENT_SEARCH = "Search:Event";
     public enum State {
         NOT_INITIALIZED,
         INITIALIZING,
         INITIALIZED,
         INITIALIZATION_FAILED,
         CLOSED
     }
     protected volatile State state = State.NOT_INITIALIZED;
     private final AtomicBoolean orphanChecked = new AtomicBoolean(false);
     private volatile int env = -1;
     private ContentProviderClient client;
     private volatile HealthReportDatabaseStorage storage;
     private final ProfileInformationCache profileCache;
     private final EventDispatcher dispatcher;
     private final SharedPreferences prefs;
     // We track previousSession to avoid order-of-initialization confusion. We
     // accept it in the constructor, and process it after init.
     private final SessionInformation previousSession;
     private volatile SessionInformation session = null;
     public void setCurrentSession(SessionInformation session) {
         this.session = session;
     }
     public void recordGeckoStartupTime(long duration) {
         if (this.session == null) {
             return;
         }
         this.session.setTimedGeckoStartup(duration);
     }
     public void recordJavaStartupTime(long duration) {
         if (this.session == null) {
             return;
         }
         this.session.setTimedJavaStartup(duration);
     }
     /**
      * This constructor does IO. Run it on a background thread.
      *
      * appLocale can be null, which indicates that it will be provided later.
      */
     public BrowserHealthRecorder(final Context context,
                                  final SharedPreferences appPrefs,
                                  final String profilePath,
                                  final EventDispatcher dispatcher,
                                  final String osLocale,
                                  final String appLocale,
                                  SessionInformation previousSession) {
         Log.d(LOG_TAG, "Initializing. Dispatcher is " + dispatcher);
         this.dispatcher = dispatcher;
         this.previousSession = previousSession;
         this.client = EnvironmentBuilder.getContentProviderClient(context);
         if (this.client == null) {
             throw new IllegalStateException("Could not fetch Health Report content provider.");
         }
         this.storage = EnvironmentBuilder.getStorage(this.client, profilePath);
         if (this.storage == null) {
             // Stick around even if we don't have storage: eventually we'll
             // want to report total failures of FHR storage itself, and this
             // way callers don't need to worry about whether their health
             // recorder didn't initialize.
             this.client.release();
             this.client = null;
         }
         // Note that the PIC is not necessarily fully initialized at this point:
         // we haven't set the app locale. This must be done before an environment
         // is recorded.
         this.profileCache = new ProfileInformationCache(profilePath);
         try {
             this.initialize(context, profilePath, osLocale, appLocale);
         } catch (Exception e) {
             Log.e(LOG_TAG, "Exception initializing.", e);
         }
         this.prefs = appPrefs;
     }
     public boolean isEnabled() {
         return true;
     }
     /**
      * Shut down database connections, unregister event listeners, and perform
      * provider-specific uninitialization.
      */
     public synchronized void close() {
         switch (this.state) {
             case CLOSED:
                 Log.w(LOG_TAG, "Ignoring attempt to double-close closed BrowserHealthRecorder.");
                 return;
             case INITIALIZED:
                 Log.i(LOG_TAG, "Closing Health Report client.");
                 break;
             default:
                 Log.i(LOG_TAG, "Closing incompletely initialized BrowserHealthRecorder.");
         }
         this.state = State.CLOSED;
         this.unregisterEventListeners();
         // Add any necessary provider uninitialization here.
         this.storage = null;
         if (this.client != null) {
             this.client.release();
             this.client = null;
         }
     }
     private void unregisterEventListeners() {
         if (state != State.INITIALIZED) {
             return;
         }
         this.dispatcher.unregisterEventListener(EVENT_SNAPSHOT, this);
         this.dispatcher.unregisterEventListener(EVENT_ADDONS_CHANGE, this);
         this.dispatcher.unregisterEventListener(EVENT_ADDONS_UNINSTALLING, this);
         this.dispatcher.unregisterEventListener(EVENT_PREF_CHANGE, this);
         this.dispatcher.unregisterEventListener(EVENT_KEYWORD_SEARCH, this);
         this.dispatcher.unregisterEventListener(EVENT_SEARCH, this);
     }
     public void onAppLocaleChanged(String to) {
         Log.d(LOG_TAG, "Setting health recorder app locale to " + to);
         this.profileCache.beginInitialization();
         this.profileCache.setAppLocale(to);
     }
     public void onAddonChanged(String id, JSONObject json) {
         this.profileCache.beginInitialization();
         try {
             this.profileCache.updateJSONForAddon(id, json);
         } catch (IllegalStateException e) {
             Log.w(LOG_TAG, "Attempted to update add-on cache prior to full init.", e);
         }
     }
     public void onAddonUninstalling(String id) {
         this.profileCache.beginInitialization();
         try {
             this.profileCache.removeAddon(id);
         } catch (IllegalStateException e) {
             Log.w(LOG_TAG, "Attempted to update add-on cache prior to full init.", e);
         }
     }
     /**
      * Call this when a material change might have occurred in the running
      * environment, such that a new environment should be computed and prepared
      * for use in future events.
      *
      * Invoke this method after calls that mutate the environment.
      *
      * If this change resulted in a transition between two environments, {@link
      * #onEnvironmentTransition(int, int, boolean, String)} will be invoked on the background
      * thread.
      */
     public synchronized void onEnvironmentChanged() {
         onEnvironmentChanged(true, "E");
     }
     /**
      * If `startNewSession` is false, it means no new session should begin
      * (e.g., because we're about to restart, and we don't want to create
      * an orphan).
      */
     public synchronized void onEnvironmentChanged(final boolean startNewSession, final String sessionEndReason) {
         final int previousEnv = this.env;
         this.env = -1;
         try {
             profileCache.completeInitialization();
         } catch (java.io.IOException e) {
             Log.e(LOG_TAG, "Error completing profile cache initialization.", e);
             this.state = State.INITIALIZATION_FAILED;
             return;
         }
         final int updatedEnv = ensureEnvironment();
         if (updatedEnv == -1 ||
             updatedEnv == previousEnv) {
             Log.v(LOG_TAG, "Environment didn't change.");
             return;
         }
         ThreadUtils.postToBackgroundThread(new Runnable() {
             @Override
             public void run() {
                 try {
                     onEnvironmentTransition(previousEnv, updatedEnv, startNewSession, sessionEndReason);
                 } catch (Exception e) {
                     Log.w(LOG_TAG, "Could not record environment transition.", e);
                 }
             }
         });
     }
     protected synchronized int ensureEnvironment() {
         if (!(state == State.INITIALIZING ||
               state == State.INITIALIZED)) {
             throw new IllegalStateException("Not initialized.");
         }
         if (this.env != -1) {
             return this.env;
         }
         if (this.storage == null) {
             // Oh well.
             return -1;
         }
         return this.env = EnvironmentBuilder.registerCurrentEnvironment(this.storage,
                                                                         this.profileCache);
     }
     private static final String getTimesPath(final String profilePath) {
         return profilePath + File.separator + "times.json";
     }
     /**
      * Retrieve the stored profile creation time from the profile directory.
      *
      * @return the <code>created</code> value from the times.json file, or -1 on failure.
      */
     protected static long getProfileInitTimeFromFile(final String profilePath) {
         final File times = new File(getTimesPath(profilePath));
         Log.d(LOG_TAG, "Looking for " + times.getAbsolutePath());
         if (!times.exists()) {
             return -1;
         }
         Log.d(LOG_TAG, "Using times.json for profile creation time.");
         Scanner scanner = null;
         try {
             scanner = new Scanner(times, "UTF-8");
             final String contents = scanner.useDelimiter("\\A").next();
             return new JSONObject(contents).getLong("created");
         } catch (Exception e) {
             // There are assorted reasons why this might occur, but we
             // don't care. Move on.
             Log.w(LOG_TAG, "Failed to read times.json.", e);
         } finally {
             if (scanner != null) {
                 scanner.close();
             }
         }
         return -1;
     }
     /**
      * Only works on API 9 and up.
      *
      * @return the package install time, or -1 if an error occurred.
      */
     protected static long getPackageInstallTime(final Context context) {
         if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.GINGERBREAD) {
             return -1;
         }
         try {
             return context.getPackageManager().getPackageInfo(AppConstants.ANDROID_PACKAGE_NAME, 0).firstInstallTime;
         } catch (android.content.pm.PackageManager.NameNotFoundException e) {
             Log.e(LOG_TAG, "Unable to fetch our own package info. This should never occur.", e);
         }
         return -1;
     }
     private static long getProfileInitTimeHeuristic(final Context context, final String profilePath) {
         // As a pretty good shortcut, settle for installation time.
         // In all recent Firefox profiles, times.json should exist.
         final long time = getPackageInstallTime(context);
         if (time != -1) {
             return time;
         }
         // Otherwise, fall back to the filesystem.
         // We'll settle for the modification time of the profile directory.
         Log.d(LOG_TAG, "Using profile directory modified time as proxy for profile creation time.");
         return new File(profilePath).lastModified();
     }
     private static long getAndPersistProfileInitTime(final Context context, final String profilePath) {
         // Let's look in the profile.
         long time = getProfileInitTimeFromFile(profilePath);
         if (time > 0) {
             Log.d(LOG_TAG, "Incorporating environment: times.json profile creation = " + time);
             return time;
         }
         // Otherwise, we need to compute a valid creation time and write it out.
         time = getProfileInitTimeHeuristic(context, profilePath);
         if (time > 0) {
             // Write out a stub times.json.
             try {
                 FileOutputStream stream = new FileOutputStream(getTimesPath(profilePath));
                 OutputStreamWriter writer = new OutputStreamWriter(stream, Charset.forName("UTF-8"));
                 try {
                     writer.append("{\"created\": " + time + "}\n");
                 } finally {
                     writer.close();
                 }
             } catch (Exception e) {
                 // Best-effort.
                 Log.w(LOG_TAG, "Couldn't write times.json.", e);
             }
         }
         Log.d(LOG_TAG, "Incorporating environment: profile creation = " + time);
         return time;
     }
     private void onPrefMessage(final String pref, final JSONObject message) {
         Log.d(LOG_TAG, "Incorporating environment: " + pref);
         if (PREF_ACCEPT_LANG.equals(pref)) {
             // We only record whether this is user-set.
             try {
                 this.profileCache.beginInitialization();
                 this.profileCache.setAcceptLangUserSet(message.getBoolean("isUserSet"));
             } catch (JSONException ex) {
                 Log.w(LOG_TAG, "Unexpected JSONException fetching isUserSet for " + pref);
             }
             return;
         }
         // (We only handle boolean prefs right now.)
         try {
             boolean value = message.getBoolean("value");
             if (AppConstants.TELEMETRY_PREF_NAME.equals(pref)) {
                 this.profileCache.beginInitialization();
                 this.profileCache.setTelemetryEnabled(value);
                 return;
             }
             if (PREF_BLOCKLIST_ENABLED.equals(pref)) {
                 this.profileCache.beginInitialization();
                 this.profileCache.setBlocklistEnabled(value);
                 return;
             }
         } catch (JSONException ex) {
             Log.w(LOG_TAG, "Unexpected JSONException fetching boolean value for " + pref);
             return;
         }
         Log.w(LOG_TAG, "Unexpected pref: " + pref);
     }
     /**
      * Background init helper.
      */
     private void initializeStorage() {
         Log.d(LOG_TAG, "Done initializing profile cache. Beginning storage init.");
         final BrowserHealthRecorder self = this;
         ThreadUtils.postToBackgroundThread(new Runnable() {
             @Override
             public void run() {
                 synchronized (self) {
                     if (state != State.INITIALIZING) {
                         Log.w(LOG_TAG, "Unexpected state during init: " + state);
                         return;
                     }
                     // Belt and braces.
                     if (storage == null) {
                         Log.w(LOG_TAG, "Storage is null during init; shutting down?");
                         if (state == State.INITIALIZING) {
                             state = State.INITIALIZATION_FAILED;
                         }
                         return;
                     }
                     try {
                         storage.beginInitialization();
                     } catch (Exception e) {
                         Log.e(LOG_TAG, "Failed to init storage.", e);
                         state = State.INITIALIZATION_FAILED;
                         return;
                     }
                     try {
                         // Listen for add-ons and prefs changes.
                         dispatcher.registerEventListener(EVENT_ADDONS_UNINSTALLING, self);
                         dispatcher.registerEventListener(EVENT_ADDONS_CHANGE, self);
                         dispatcher.registerEventListener(EVENT_PREF_CHANGE, self);
                         // Initialize each provider here.
                         initializeSessionsProvider();
                         initializeSearchProvider();
                         Log.d(LOG_TAG, "Ensuring environment.");
                         ensureEnvironment();
                         Log.d(LOG_TAG, "Finishing init.");
                         storage.finishInitialization();
                         state = State.INITIALIZED;
                     } catch (Exception e) {
                         state = State.INITIALIZATION_FAILED;
                         storage.abortInitialization();
                         Log.e(LOG_TAG, "Initialization failed.", e);
                         return;
                     }
                     // Now do whatever we do after we start up.
                     checkForOrphanSessions();
                 }
             }
         });
     }
     /**
      * Add provider-specific initialization in this method.
      */
     private synchronized void initialize(final Context context,
                                          final String profilePath,
                                          final String osLocale,
                                          final String appLocale)
         throws java.io.IOException {
         Log.d(LOG_TAG, "Initializing profile cache.");
         this.state = State.INITIALIZING;
         // If we can restore state from last time, great.
         if (this.profileCache.restoreUnlessInitialized()) {
             this.profileCache.updateLocales(osLocale, appLocale);
             this.profileCache.completeInitialization();
             Log.d(LOG_TAG, "Successfully restored state. Initializing storage.");
             initializeStorage();
             return;
         }
         // Otherwise, let's initialize it from scratch.
         this.profileCache.beginInitialization();
         this.profileCache.setProfileCreationTime(getAndPersistProfileInitTime(context, profilePath));
         this.profileCache.setOSLocale(osLocale);
         this.profileCache.setAppLocale(appLocale);
         // Because the distribution lookup can take some time, do it at the end of
         // our background startup work, along with the Gecko snapshot fetch.
         final GeckoEventListener self = this;
         ThreadUtils.postToBackgroundThread(new Runnable() {
             @Override
             public void run() {
                 final DistributionDescriptor desc = new Distribution(context).getDescriptor();
                 if (desc != null && desc.valid) {
                     profileCache.setDistributionString(desc.id, desc.version);
                 }
                 Log.d(LOG_TAG, "Requesting all add-ons and FHR prefs from Gecko.");
                 dispatcher.registerEventListener(EVENT_SNAPSHOT, self);
                 GeckoAppShell.sendEventToGecko(GeckoEvent.createBroadcastEvent("HealthReport:RequestSnapshot", null));
             }
         });
     }
     /**
      * Invoked in the background whenever the environment transitions between
      * two valid values.
      */
     protected void onEnvironmentTransition(int prev, int env, boolean startNewSession, String sessionEndReason) {
         if (this.state != State.INITIALIZED) {
             Log.d(LOG_TAG, "Not initialized: not recording env transition (" + prev + " => " + env + ").");
             return;
         }
         final SharedPreferences.Editor editor = this.prefs.edit();
         recordSessionEnd(sessionEndReason, editor, prev);
         if (!startNewSession) {
             editor.commit();
             return;
         }
         final SessionInformation newSession = SessionInformation.forRuntimeTransition();
         setCurrentSession(newSession);
         newSession.recordBegin(editor);
         editor.commit();
     }
     @Override
     public void handleMessage(String event, JSONObject message) {
         try {
             if (EVENT_SNAPSHOT.equals(event)) {
                 Log.d(LOG_TAG, "Got all add-ons and prefs.");
                 try {
                     JSONObject json = message.getJSONObject("json");
                     JSONObject addons = json.getJSONObject("addons");
                     Log.i(LOG_TAG, "Persisting " + addons.length() + " add-ons.");
                     profileCache.setJSONForAddons(addons);
                     JSONObject prefs = json.getJSONObject("prefs");
                     Log.i(LOG_TAG, "Persisting prefs.");
                     Iterator<?> keys = prefs.keys();
                     while (keys.hasNext()) {
                         String pref = (String) keys.next();
                         this.onPrefMessage(pref, prefs.getJSONObject(pref));
                     }
                     profileCache.completeInitialization();
                 } catch (java.io.IOException e) {
                     Log.e(LOG_TAG, "Error completing profile cache initialization.", e);
                     state = State.INITIALIZATION_FAILED;
                     return;
                 }
                 if (state == State.INITIALIZING) {
                     initializeStorage();
                 } else {
                     this.onEnvironmentChanged();
                 }
                 return;
             }
             if (EVENT_ADDONS_UNINSTALLING.equals(event)) {
                 this.onAddonUninstalling(message.getString("id"));
                 this.onEnvironmentChanged();
                 return;
             }
             if (EVENT_ADDONS_CHANGE.equals(event)) {
                 this.onAddonChanged(message.getString("id"), message.getJSONObject("json"));
                 this.onEnvironmentChanged();
                 return;
             }
             if (EVENT_PREF_CHANGE.equals(event)) {
                 final String pref = message.getString("pref");
                 Log.d(LOG_TAG, "Pref changed: " + pref);
                 this.onPrefMessage(pref, message);
                 this.onEnvironmentChanged();
                 return;
             }
             // Searches.
             if (EVENT_KEYWORD_SEARCH.equals(event)) {
                 // A search via the URL bar. Since we eliminate all other search possibilities
                 // (e.g. bookmarks keyword, search suggestion) when we initially process the
                 // search URL, this is considered a default search.
                 recordSearch(message.getString("identifier"), "bartext");
                 return;
             }
             if (EVENT_SEARCH.equals(event)) {
                 if (!message.has("location")) {
                     Log.d(LOG_TAG, "Ignoring search without location.");
                     return;
                 }
                 recordSearch(message.optString("identifier", null), message.getString("location"));
                 return;
             }
         } catch (Exception e) {
             Log.e(LOG_TAG, "Exception handling message \"" + event + "\":", e);
         }
     }
     /*
      * Searches.
      */
     public static final String MEASUREMENT_NAME_SEARCH_COUNTS = "org.mozilla.searches.counts";
     public static final int MEASUREMENT_VERSION_SEARCH_COUNTS = 5;
     public static final Set<String> SEARCH_LOCATIONS = Collections.unmodifiableSet(new HashSet<String>(Arrays.asList(new String[] {
         "barkeyword",
         "barsuggest",
         "bartext",
     })));
     private void initializeSearchProvider() {
         this.storage.ensureMeasurementInitialized(
             MEASUREMENT_NAME_SEARCH_COUNTS,
             MEASUREMENT_VERSION_SEARCH_COUNTS,
             new MeasurementFields() {
                 @Override
                 public Iterable<FieldSpec> getFields() {
                     ArrayList<FieldSpec> out = new ArrayList<FieldSpec>(SEARCH_LOCATIONS.size());
                     for (String location : SEARCH_LOCATIONS) {
                         // We're not using a counter, because the set of engine
                         // identifiers is potentially unbounded, and thus our
                         // measurement version would have to keep growing as
                         // fields changed. Instead we store discrete values, and
                         // accumulate them into a counting map during processing.
                         out.add(new FieldSpec(location, Field.TYPE_COUNTED_STRING_DISCRETE));
                     }
                     return out;
                 }
         });
         // Do this here, rather than in a centralized registration spot, in
         // case the above throws and we wind up handling events that we can't
         // store.
         this.dispatcher.registerEventListener(EVENT_KEYWORD_SEARCH, this);
         this.dispatcher.registerEventListener(EVENT_SEARCH, this);
     }
     /**
      * Record a search.
      *
      * @param engineID the string identifier for the engine. Can be <code>null</code>.
      * @param location one of a fixed set of locations: see {@link #SEARCH_LOCATIONS}.
      */
     public void recordSearch(final String engineID, final String location) {
         if (this.state != State.INITIALIZED) {
             Log.d(LOG_TAG, "Not initialized: not recording search. (" + this.state + ")");
             return;
         }
         final int env = this.env;
         if (env == -1) {
             Log.d(LOG_TAG, "No environment: not recording search.");
             return;
         }
         if (location == null) {
             throw new IllegalArgumentException("location must be provided for search.");
         }
         // Ensure that we don't throw when trying to look up the field for an
         // unknown location. If you add a search location, you must extend the
         // list of search locations *and update the measurement version*.
         if (!SEARCH_LOCATIONS.contains(location)) {
             throw new IllegalArgumentException("Unexpected location: " + location);
         }
         final int day = storage.getDay();
         final String key = (engineID == null) ? "other" : engineID;
         ThreadUtils.postToBackgroundThread(new Runnable() {
             @Override
             public void run() {
                 final HealthReportDatabaseStorage storage = BrowserHealthRecorder.this.storage;
                 if (storage == null) {
                     Log.d(LOG_TAG, "No storage: not recording search. Shutting down?");
                     return;
                 }
                 Log.d(LOG_TAG, "Recording search: " + key + ", " + location +
                                " (" + day + ", " + env + ").");
                 final int searchField = storage.getField(MEASUREMENT_NAME_SEARCH_COUNTS,
                                                          MEASUREMENT_VERSION_SEARCH_COUNTS,
                                                          location)
                                                .getID();
                 storage.recordDailyDiscrete(env, day, searchField, key);
             }
         });
     }
     /*
      * Sessions.
      *
      * We record session beginnings in SharedPreferences, because it's cheaper
      * to do that than to either write to then update the DB (which requires
      * keeping a row identifier to update, as well as two writes) or to record
      * two events (which doubles storage space and requires rollup logic).
      *
      * The pattern is:
      *
      * 1. On startup, determine whether an orphan session exists by looking for
      *    a saved timestamp in prefs. If it does, then record the orphan in FHR
      *    storage.
      * 2. Record in prefs that a new session has begun. Track the timestamp (so
      *    we know to which day the session belongs).
      * 3. As startup timings become available, accumulate them in memory.
      * 4. On clean shutdown, read the values from here, write them to the DB, and
      *    delete the sentinel time from SharedPreferences.
      * 5. On a dirty shutdown, the in-memory session will not be written to the
      *    DB, and the current session will be orphaned.
      *
      * Sessions are begun in onResume (and thus implicitly onStart) and ended
      * in onPause.
      *
      * Session objects are stored as discrete JSON.
      *
      *   "org.mozilla.appSessions": {
      *     _v: 4,
      *     "normal": [
      *       {"r":"P", "d": 123},
      *     ],
      *     "abnormal": [
      *       {"r":"A", "oom": true, "stopped": false}
      *     ]
      *   }
      *
      * "r": reason. Values are "P" (activity paused), "A" (abnormal termination)
      * "d": duration. Value in seconds.
      * "sg": Gecko startup time. Present if this is a clean launch. This
      *       corresponds to the telemetry timer FENNEC_STARTUP_TIME_GECKOREADY.
      * "sj": Java activity init time. Present if this is a clean launch. This
      *       corresponds to the telemetry timer FENNEC_STARTUP_TIME_JAVAUI,
      *       and includes initialization tasks beyond initial
      *       onWindowFocusChanged.
      *
      * Abnormal terminations will be missing a duration and will feature these keys:
      *
      * "oom": was the session killed by an OOM exception?
      * "stopped": was the session stopped gently?
      */
     public static final String MEASUREMENT_NAME_SESSIONS = "org.mozilla.appSessions";
     public static final int MEASUREMENT_VERSION_SESSIONS = 4;
     private void initializeSessionsProvider() {
         this.storage.ensureMeasurementInitialized(
             MEASUREMENT_NAME_SESSIONS,
             MEASUREMENT_VERSION_SESSIONS,
             new MeasurementFields() {
                 @Override
                 public Iterable<FieldSpec> getFields() {
                     List<FieldSpec> out = Arrays.asList(
                         new FieldSpec("normal", Field.TYPE_JSON_DISCRETE),
                         new FieldSpec("abnormal", Field.TYPE_JSON_DISCRETE));
                     return out;
                 }
         });
     }
     /**
      * Logic shared between crashed and normal sessions.
      */
     private void recordSessionEntry(String field, SessionInformation session, final int environment, JSONObject value) {
         final HealthReportDatabaseStorage storage = this.storage;
         if (storage == null) {
             Log.d(LOG_TAG, "No storage: not recording session entry. Shutting down?");
             return;
         }
         try {
             final int sessionField = storage.getField(MEASUREMENT_NAME_SESSIONS,
                                                       MEASUREMENT_VERSION_SESSIONS,
                                                       field)
                                             .getID();
             final int day = storage.getDay(session.wallStartTime);
             storage.recordDailyDiscrete(environment, day, sessionField, value);
             Log.v(LOG_TAG, "Recorded session entry for env " + environment + ", current is " + env);
         } catch (Exception e) {
             Log.w(LOG_TAG, "Unable to record session completion.", e);
         }
     }
     public void checkForOrphanSessions() {
         if (!this.orphanChecked.compareAndSet(false, true)) {
             Log.w(LOG_TAG, "Attempting to check for orphan sessions more than once.");
             return;
         }
         Log.d(LOG_TAG, "Checking for orphan session.");
         if (this.previousSession == null) {
             return;
         }
         if (this.previousSession.wallStartTime == 0) {
             return;
         }
         if (state != State.INITIALIZED) {
             // Something has gone awry.
             Log.e(LOG_TAG, "Attempted to record bad session end without initialized recorder.");
             return;
         }
         try {
             recordSessionEntry("abnormal", this.previousSession, this.env,
                                this.previousSession.getCrashedJSON());
         } catch (Exception e) {
             Log.w(LOG_TAG, "Unable to generate session JSON.", e);
             // Future: record this exception in FHR's own error submitter.
         }
     }
     public void recordSessionEnd(String reason, SharedPreferences.Editor editor) {
         recordSessionEnd(reason, editor, env);
     }
     /**
      * Record that the current session ended. Does not commit the provided editor.
      *
      * @param environment An environment ID. This allows callers to record the
      *                    end of a session due to an observed environment change.
      */
     public void recordSessionEnd(String reason, SharedPreferences.Editor editor, final int environment) {
         Log.d(LOG_TAG, "Recording session end: " + reason);
         if (state != State.INITIALIZED) {
             // Something has gone awry.
             Log.e(LOG_TAG, "Attempted to record session end without initialized recorder.");
             return;
         }
         final SessionInformation session = this.session;
         this.session = null;        // So it can't be double-recorded.
         if (session == null) {
             Log.w(LOG_TAG, "Unable to record session end: no session. Already ended?");
             return;
         }
         if (session.wallStartTime <= 0) {
             Log.e(LOG_TAG, "Session start " + session.wallStartTime + " isn't valid! Can't record end.");
             return;
         }
         long realEndTime = android.os.SystemClock.elapsedRealtime();
         try {
             JSONObject json = session.getCompletionJSON(reason, realEndTime);
             recordSessionEntry("normal", session, environment, json);
         } catch (JSONException e) {
             Log.w(LOG_TAG, "Unable to generate session JSON.", e);
             // Continue so we don't hit it next time.
             // Future: record this exception in FHR's own error submitter.
         }
         // Track the end of this session in shared prefs, so it doesn't get
         // double-counted on next run.
         session.recordCompletion(editor);
     }
 }

The Tor Browser / annotate

mobile/android/base/health/BrowserHealthRecorder.java@6474c204b198 (annotated)

mobile/android/base/health/BrowserHealthRecorder.java