IME Logger improvement

- Eabled to handle an array value in the log entry
- Added word counter
- Added parameters to Log APIs
- Obfuscate user privacy support

Change-Id: I5e2a7d58113b0581e51d22d6dac9a6a6fdc34356

java/src/com/android/inputmethod/latin/LatinImeLogger.java

@@ -24,6 +24,7 @@ import android.text.format.DateUtils;
 import android.util.Log;
 
 import java.util.ArrayList;
+import java.util.Collections;
 
 public class LatinImeLogger implements SharedPreferences.OnSharedPreferenceChangeListener {
     private static final String TAG = "LatinIMELogs";
@@ -31,20 +32,23 @@ public class LatinImeLogger implements SharedPreferences.OnSharedPreferenceChang
     // DEFAULT_LOG_ENABLED should be false when released to public.
     private static final boolean DEFAULT_LOG_ENABLED = true;
 
-    private static final long MINIMUMSENDINTERVAL = 1 * DateUtils.MINUTE_IN_MILLIS; // 1 min
+    private static final long MINIMUMSENDINTERVAL = 60 * DateUtils.SECOND_IN_MILLIS; // 60 sec
     private static final long MINIMUMCOUNTINTERVAL = 20 * DateUtils.SECOND_IN_MILLIS; // 20 sec
     private static final char SEPARATER = ';';
     private static final int ID_CLICKSUGGESTION = 0;
     private static final int ID_AUTOSUGGESTION = 1;
     private static final int ID_AUTOSUGGESTIONCANCELED = 2;
-    private static final int ID_INPUT = 3;
+    private static final int ID_INPUT_COUNT = 3;
-    private static final int ID_DELETE = 4;
+    private static final int ID_DELETE_COUNT = 4;
+    private static final int ID_WORD_COUNT = 5;
+
     private static final String PREF_ENABLE_LOG = "enable_log";
 
     private static LatinImeLogger sLatinImeLogger = new LatinImeLogger();
     public static boolean sLogEnabled = true;
 
     private ArrayList<LogEntry> mLogBuffer = null;
+    private ArrayList<LogEntry> mPrivacyLogBuffer = null;
     private Context mContext = null;
     private DropBoxManager mDropBox = null;
     private long mLastTimeActive;
@@ -53,17 +57,29 @@ public class LatinImeLogger implements SharedPreferences.OnSharedPreferenceChang
 
     private int mDeleteCount;
     private int mInputCount;
+    private int mWordCount;
 
-
+    private static class LogEntry implements Comparable<LogEntry> {
-    private static class LogEntry {
         public final int mTag;
-        public final long mTime;
+        public final String[] mData;
-        public final String mData;
+        public long mTime;
-        public LogEntry (long time, int tag, String data) {
+
+        public LogEntry (long time, int tag, String[] data) {
             mTag = tag;
             mTime = time;
             mData = data;
         }
+
+        public int compareTo(LogEntry log2) {
+            if (mData.length == 0 && log2.mData.length == 0) {
+                return 0;
+            } else if (mData.length == 0) {
+                return 1;
+            } else if (log2.mData.length == 0) {
+                return -1;
+            }
+            return log2.mData[0].compareTo(mData[0]);
+        }
     }
 
     private void initInternal(Context context) {
@@ -101,11 +117,36 @@ public class LatinImeLogger implements SharedPreferences.OnSharedPreferenceChang
         return false;
     }
 
+    private static boolean checkStringsDataSafe(String[] strings) {
+        for(String s: strings) {
+            if (!checkStringDataSafe(s)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
     private void addCountEntry(long time) {
-        mLogBuffer.add(new LogEntry (time, ID_DELETE, String.valueOf(mDeleteCount)));
+        mLogBuffer.add(
-        mLogBuffer.add(new LogEntry (time, ID_INPUT, String.valueOf(mInputCount)));
+                new LogEntry (time, ID_DELETE_COUNT,
+                        new String[] {String.valueOf(mDeleteCount)}));
+        mLogBuffer.add(new LogEntry (time, ID_INPUT_COUNT,
+                new String[] {String.valueOf(mInputCount)}));
+        mLogBuffer.add(new LogEntry (time, ID_WORD_COUNT,
+                new String[] {String.valueOf(mWordCount)}));
         mDeleteCount = 0;
         mInputCount = 0;
+        mWordCount = 0;
+    }
+
+    private void flushPrivacyLogSafely() {
+        long now = System.currentTimeMillis();
+        Collections.sort(mPrivacyLogBuffer);
+        for (LogEntry l: mPrivacyLogBuffer) {
+            l.mTime = now;
+            mLogBuffer.add(l);
+        }
+        mPrivacyLogBuffer.clear();
     }
 
     /**
@@ -115,62 +156,57 @@ public class LatinImeLogger implements SharedPreferences.OnSharedPreferenceChang
      */
     private void addData(int tag, Object data) {
         switch (tag) {
-            case ID_DELETE:
+            case ID_DELETE_COUNT:
                 if (mLastTimeActive - mLastTimeCountEntry > MINIMUMCOUNTINTERVAL
                         || (mDeleteCount == 0 && mInputCount == 0)) {
                     addCountEntry(mLastTimeActive);
                 }
                 mDeleteCount += (Integer)data;
                 break;
-            case ID_INPUT:
+            case ID_INPUT_COUNT:
                 if (mLastTimeActive - mLastTimeCountEntry > MINIMUMCOUNTINTERVAL
                         || (mDeleteCount == 0 && mInputCount == 0)) {
                     addCountEntry(mLastTimeActive);
                 }
                 mInputCount += (Integer)data;
                 break;
-            default:
+            case ID_CLICKSUGGESTION:
-                if (data instanceof String) {
+            case ID_AUTOSUGGESTION:
-                    String dataString = (String) data;
+                ++mWordCount;
-                    if (checkStringDataSafe(dataString)) {
+                String[] dataStrings = (String[]) data;
-                        mLogBuffer.add(new LogEntry (System.currentTimeMillis(), tag, dataString));
+                if (checkStringsDataSafe(dataStrings)) {
+                    mPrivacyLogBuffer.add(
+                            new LogEntry (System.currentTimeMillis(), tag, dataStrings));
                 } else {
                     if (DBG) {
                         Log.d(TAG, "Skipped to add an entry because data is unsafe.");
                     }
                 }
+                break;
+            case ID_AUTOSUGGESTIONCANCELED:
+                --mWordCount;
+                dataStrings = (String[]) data;
+                if (checkStringsDataSafe(dataStrings)) {
+                    mPrivacyLogBuffer.add(
+                            new LogEntry (System.currentTimeMillis(), tag, dataStrings));
                 } else {
                     if (DBG) {
-                        Log.e(TAG, "Log is invalid.");
+                        Log.d(TAG, "Skipped to add an entry because data is unsafe.");
                     }
                 }
                 break;
+            default:
+                if (DBG) {
+                    Log.e(TAG, "Log Tag is not entried.");
+                }
+                break;
         }
     }
 
-    private static void appendWithLength(StringBuffer sb, String data) {
-        sb.append(data.length());
-        sb.append(SEPARATER);
-        sb.append(data);
-    }
-
-    private static void appendLogEntry(StringBuffer sb, String time, String tag, String data) {
-        appendWithLength(sb, time);
-        appendWithLength(sb, tag);
-        appendWithLength(sb, data);
-    }
-
-    private String createStringFromEntries(ArrayList<LogEntry> logs) {
-        addCountEntry(System.currentTimeMillis());
-        StringBuffer sb = new StringBuffer();
-        for (LogEntry log: logs) {
-            appendLogEntry(sb, String.valueOf(log.mTime), String.valueOf(log.mTag), log.mData);
-        }
-        return sb.toString();
-    }
-
     private void commitInternal() {
-        String s = createStringFromEntries(mLogBuffer);
+        flushPrivacyLogSafely();
+        addCountEntry(System.currentTimeMillis());
+        String s = LogSerializer.createStringFromEntries(mLogBuffer);
         if (DBG) {
             Log.d(TAG, "Commit log: " + s);
         }
@@ -180,10 +216,11 @@ public class LatinImeLogger implements SharedPreferences.OnSharedPreferenceChang
     }
 
     private void sendLogToDropBox(int tag, Object s) {
-        if (DBG) {
-            Log.d(TAG, "SendLog: " + tag + ";" + s);
-        }
         long now = System.currentTimeMillis();
+        if (DBG) {
+            Log.d(TAG, "SendLog: " + tag + ";" + s + ","
+                    + (now - mLastTimeSend - MINIMUMSENDINTERVAL) );
+        }
         if (now - mLastTimeActive > MINIMUMSENDINTERVAL) {
             // Send a log before adding an log entry if the last data is too old.
             commitInternal();
@@ -218,34 +255,64 @@ public class LatinImeLogger implements SharedPreferences.OnSharedPreferenceChang
         }
     }
 
-    public static void logOnClickSuggestion(String s) {
+    public static void logOnClickSuggestion(String before, String after, int position) {
         if (sLogEnabled) {
-            sLatinImeLogger.sendLogToDropBox(ID_CLICKSUGGESTION, s);
+            String[] strings = new String[] {before, after, String.valueOf(position)};
+            sLatinImeLogger.sendLogToDropBox(ID_CLICKSUGGESTION, strings);
         }
     }
 
-    public static void logOnAutoSuggestion(String s) {
+    public static void logOnAutoSuggestion(String before, String after) {
         if (sLogEnabled) {
-            sLatinImeLogger.sendLogToDropBox(ID_AUTOSUGGESTION, s);
+            String[] strings = new String[] {before, after};
+            sLatinImeLogger.sendLogToDropBox(ID_AUTOSUGGESTION, strings);
         }
     }
 
-    public static void logOnAutoSuggestionCanceled(String s) {
+    public static void logOnAutoSuggestionCanceled(String before, String after) {
         if (sLogEnabled) {
-            sLatinImeLogger.sendLogToDropBox(ID_AUTOSUGGESTIONCANCELED, s);
+            String[] strings = new String[] {before, after};
+            sLatinImeLogger.sendLogToDropBox(ID_AUTOSUGGESTIONCANCELED, strings);
         }
     }
 
     public static void logOnDelete(int length) {
         if (sLogEnabled) {
-            sLatinImeLogger.sendLogToDropBox(ID_DELETE, length);
+            sLatinImeLogger.sendLogToDropBox(ID_DELETE_COUNT, length);
         }
     }
 
     public static void logOnInputChar(int length) {
         if (sLogEnabled) {
-            sLatinImeLogger.sendLogToDropBox(ID_INPUT, length);
+            sLatinImeLogger.sendLogToDropBox(ID_INPUT_COUNT, length);
         }
     }
 
+    private static class LogSerializer {
+        private static void appendWithLength(StringBuffer sb, String data) {
+            sb.append(data.length());
+            sb.append(SEPARATER);
+            sb.append(data);
+            sb.append(SEPARATER);
+        }
+
+        private static void appendLogEntry(StringBuffer sb, String time, String tag, String[] data) {
+            if (data.length > 0) {
+                appendWithLength(sb, String.valueOf(data.length + 2));
+                appendWithLength(sb, time);
+                appendWithLength(sb, tag);
+                for (String s: data) {
+                    appendWithLength(sb, s);
+                }
+            }
+        }
+
+        public static String createStringFromEntries(ArrayList<LogEntry> logs) {
+            StringBuffer sb = new StringBuffer();
+            for (LogEntry log: logs) {
+                appendLogEntry(sb, String.valueOf(log.mTime), String.valueOf(log.mTag), log.mData);
+            }
+            return sb.toString();
+        }
+    }
 }