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only output every kth word to log 

multi-project CL with Ib5b544b9b2d8b0e4419238976b2e274e5ac564f8

Bug: 6188932
Change-Id: Iea68cf36924d6fda126130a98431a6ce02ba251e
main
Kurt Partridge 2012-06-20 20:23:19 -07:00
parent 01106f6a10
commit e961188e9f
1 changed files with 58 additions and 8 deletions
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66
java/src/com/android/inputmethod/latin/ResearchLogger.java
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@ -197,6 +197,7 @@ public class ResearchLogger implements SharedPreferences.OnSharedPreferenceChang
Log.d(TAG, "stop called");
if (mLoggingHandler != null && mLoggingState == LOGGING_STATE_ON) {
mLoggingState = LOGGING_STATE_STOPPING;
flushEventQueue(true);
// put this in the Handler queue so pending writes are processed first.
mLoggingHandler.post(new Runnable() {
@Override
@ -379,11 +380,52 @@ public class ResearchLogger implements SharedPreferences.OnSharedPreferenceChang
mCurrentLogUnit.addLogAtom(keys, values, false);
}
// Used to track how often words are logged. Too-frequent logging can leak
// semantics, disclosing private data.
/* package for test */ static class LoggingFrequencyState {
private static final int DEFAULT_WORD_LOG_FREQUENCY = 10;
private int mWordsRemainingToSkip;
private final int mFrequency;
/**
* Tracks how often words may be uploaded.
*
* @param frequency 1=Every word, 2=Every other word, etc.
*/
public LoggingFrequencyState(int frequency) {
mFrequency = frequency;
mWordsRemainingToSkip = mFrequency;
}
public void onWordLogged() {
mWordsRemainingToSkip = mFrequency;
}
public void onWordNotLogged() {
if (mWordsRemainingToSkip > 1) {
mWordsRemainingToSkip--;
}
}
public boolean isSafeToLog() {
return mWordsRemainingToSkip <= 1;
}
}
/* package for test */ LoggingFrequencyState mLoggingFrequencyState =
new LoggingFrequencyState(LoggingFrequencyState.DEFAULT_WORD_LOG_FREQUENCY);
/* package for test */ boolean isPrivacyThreat(String word) {
// currently: word not in dictionary or contains numbers.
// Current checks:
// - Word not in dictionary
// - Word contains numbers
// - Privacy-safe word not logged recently
if (TextUtils.isEmpty(word)) {
return false;
}
if (!mLoggingFrequencyState.isSafeToLog()) {
return true;
}
final int length = word.length();
boolean hasLetter = false;
for (int i = 0; i < length; i = word.offsetByCodePoints(i, 1)) {
@ -410,15 +452,26 @@ public class ResearchLogger implements SharedPreferences.OnSharedPreferenceChang
return false;
}
private void onWordComplete(String word) {
final boolean isPrivacyThreat = isPrivacyThreat(word);
flushEventQueue(isPrivacyThreat);
if (isPrivacyThreat) {
mLoggingFrequencyState.onWordNotLogged();
} else {
mLoggingFrequencyState.onWordLogged();
}
}
/**
* Write out enqueued LogEvents to the log, possibly dropping privacy sensitive events.
*/
/* package for test */ synchronized void flushQueue(boolean removePotentiallyPrivateEvents) {
/* package for test */ synchronized void flushEventQueue(
boolean removePotentiallyPrivateEvents) {
if (isAllowedToLog()) {
mCurrentLogUnit.setRemovePotentiallyPrivateEvents(removePotentiallyPrivateEvents);
mLoggingHandler.post(mCurrentLogUnit);
mCurrentLogUnit = new LogUnit();
}
mCurrentLogUnit = new LogUnit();
}
private synchronized void outputEvent(final String[] keys, final Object[] values) {
@ -652,7 +705,6 @@ public class ResearchLogger implements SharedPreferences.OnSharedPreferenceChang
final ResearchLogger researchLogger = getInstance();
researchLogger.enqueuePotentiallyPrivateEvent(
EVENTKEYS_LATINIME_COMMITCURRENTAUTOCORRECTION, values);
researchLogger.flushQueue(researchLogger.isPrivacyThreat(autoCorrection));
}
private static final String[] EVENTKEYS_LATINIME_COMMITTEXT = {
@ -665,7 +717,7 @@ public class ResearchLogger implements SharedPreferences.OnSharedPreferenceChang
};
final ResearchLogger researchLogger = getInstance();
researchLogger.enqueuePotentiallyPrivateEvent(EVENTKEYS_LATINIME_COMMITTEXT, values);
researchLogger.flushQueue(researchLogger.isPrivacyThreat(scrubbedWord));
researchLogger.onWordComplete(scrubbedWord);
}
private static final String[] EVENTKEYS_LATINIME_DELETESURROUNDINGTEXT = {
@ -743,7 +795,7 @@ public class ResearchLogger implements SharedPreferences.OnSharedPreferenceChang
}
final ResearchLogger researchLogger = getInstance();
researchLogger.enqueueEvent(EVENTKEYS_LATINIME_ONWINDOWHIDDEN, values);
researchLogger.flushQueue(true); // Play it safe. Remove privacy-sensitive events.
researchLogger.flushEventQueue(true); // Play it safe. Remove privacy-sensitive events.
}
}
@ -824,7 +876,6 @@ public class ResearchLogger implements SharedPreferences.OnSharedPreferenceChang
final ResearchLogger researchLogger = getInstance();
researchLogger.enqueuePotentiallyPrivateEvent(
EVENTKEYS_LATINIME_PICKAPPLICATIONSPECIFIEDCOMPLETION, values);
researchLogger.flushQueue(researchLogger.isPrivacyThreat(cs.toString()));
}
private static final String[] EVENTKEYS_LATINIME_PICKSUGGESTIONMANUALLY = {
@ -839,7 +890,6 @@ public class ResearchLogger implements SharedPreferences.OnSharedPreferenceChang
final ResearchLogger researchLogger = getInstance();
researchLogger.enqueuePotentiallyPrivateEvent(EVENTKEYS_LATINIME_PICKSUGGESTIONMANUALLY,
values);
researchLogger.flushQueue(researchLogger.isPrivacyThreat(suggestion.toString()));
}
private static final String[] EVENTKEYS_LATINIME_PUNCTUATIONSUGGESTION = {