[WifiScoreReport] Add dumpsys for scoring data

Add a dumpsys handler to capture the data used for calculating
wifi scores.

The logged data is limited to about 12 hours, to conserve memory.

Timestamp formatting is consistent with (most) of the other
timestamps used in bugreports.

Bug: 62448744
Test: manual, new unit tests
Change-Id: Iba3f3dc4911e7939a5afacb5902f425415bbc5f0

3 files changed, 81 insertions, 3 deletions

diff --git a/service/java/com/android/server/wifi/WifiScoreReport.java b/service/java/com/android/server/wifi/WifiScoreReport.java
index 74ddf99ec..5aadc1e9b 100644
--- a/service/java/com/android/server/wifi/WifiScoreReport.java
+++ b/service/java/com/android/server/wifi/WifiScoreReport.java
@@ -24,6 +24,13 @@ import android.util.Log;
 
 import com.android.internal.R;
 
+import java.io.FileDescriptor;
+import java.io.PrintWriter;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.LinkedList;
+import java.util.Locale;
+
 /**
  * Class used to calculate scores for connected wifi networks and report it to the associated
  * network agent.
@@ -47,6 +54,7 @@ public class WifiScoreReport {
     private static final int LINK_STUCK_PENALTY = 2;
     private static final int BAD_LINKSPEED_PENALTY = 4;
     private static final int GOOD_LINKSPEED_BONUS = 4;
+    private static final int DUMPSYS_ENTRY_COUNT_LIMIT = 14400; // 12 hours on 3 second poll
 
     // Device configs. The values are examples.
     private final int mThresholdMinimumRssi5;      // -82
@@ -71,7 +79,10 @@ public class WifiScoreReport {
     private boolean mMultiBandScanResults;
     private boolean mIsHomeNetwork;
 
-    WifiScoreReport(Context context, WifiConfigManager wifiConfigManager) {
+    private final Clock mClock;
+    private int mSessionNumber = 0;
+
+    WifiScoreReport(Context context, WifiConfigManager wifiConfigManager, Clock clock) {
         // Fetch all the device configs.
         mThresholdMinimumRssi5 = context.getResources().getInteger(
                 R.integer.config_wifi_framework_wifi_score_bad_rssi_threshold_5GHz);
@@ -95,6 +106,7 @@ public class WifiScoreReport {
                 R.integer.config_wifi_framework_wifi_score_good_link_speed_5);
 
         mWifiConfigManager = wifiConfigManager;
+        mClock = clock;
     }
 
     /**
@@ -112,6 +124,8 @@ public class WifiScoreReport {
     public void reset() {
         mReport = "";
         mReportValid = false;
+        mSessionNumber++;
+        if (mVerboseLoggingEnabled) Log.d(TAG, "reset");
     }
 
     /**
@@ -148,6 +162,7 @@ public class WifiScoreReport {
                                         int aggressiveHandover, WifiMetrics wifiMetrics) {
         int score;
 
+        logLinkMetrics(wifiInfo);
         if (aggressiveHandover == 0) {
             // Use the old method
             updateScoringState(wifiInfo, aggressiveHandover);
@@ -175,7 +190,7 @@ public class WifiScoreReport {
             }
         }
 
-        mReport = String.format(" score=%d", score);
+        mReport = String.format(Locale.US, " score=%d", score);
         mReportValid = true;
         wifiMetrics.incrementWifiScoreCount(score);
     }
@@ -338,4 +353,55 @@ public class WifiScoreReport {
         return (int) Math.round(score);
     }
 
+    /**
+     * Data for dumpsys
+     *
+     * These are stored as csv formatted lines
+     */
+    private LinkedList<String> mLinkMetricsHistory = new LinkedList<String>();
+
+    /**
+     * Data logging for dumpsys
+     */
+    private void logLinkMetrics(WifiInfo wifiInfo) {
+        long now = mClock.getWallClockMillis();
+        double rssi = wifiInfo.getRssi();
+        int freq = wifiInfo.getFrequency();
+        int linkSpeed = wifiInfo.getLinkSpeed();
+        double txSuccessRate = wifiInfo.txSuccessRate;
+        double txRetriesRate = wifiInfo.txRetriesRate;
+        double txBadRate = wifiInfo.txBadRate;
+        double rxSuccessRate = wifiInfo.rxSuccessRate;
+        try {
+            String timestamp = new SimpleDateFormat("MM-dd HH:mm:ss.SSS").format(new Date(now));
+            String s = String.format(Locale.US, // Use US to avoid comma/decimal confusion
+                    "%s,%d,%.1f,%d,%d,%.2f,%.2f,%.2f,%.2f",
+                    timestamp, mSessionNumber, rssi, freq, linkSpeed,
+                    txSuccessRate, txRetriesRate, txBadRate, rxSuccessRate);
+            mLinkMetricsHistory.add(s);
+        } catch (Exception e) {
+            Log.e(TAG, "format problem", e);
+        }
+        while (mLinkMetricsHistory.size() > DUMPSYS_ENTRY_COUNT_LIMIT) {
+            mLinkMetricsHistory.removeFirst();
+        }
+    }
+
+    /**
+     * Tag to be used in dumpsys request
+     */
+    public static final String DUMP_ARG = "WifiScoreReport";
+
+    /**
+     * Dump logged signal strength and traffic measurements.
+     * @param fd unused
+     * @param pw PrintWriter for writing dump to
+     * @param args unused
+     */
+    public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
+        pw.println("time,session,rssi,freq,linkspeed,tx_good,tx_retry,tx_bad,rx");
+        for (String line : mLinkMetricsHistory) {
+            pw.println(line);
+        }
+    }
 }
diff --git a/service/java/com/android/server/wifi/WifiServiceImpl.java b/service/java/com/android/server/wifi/WifiServiceImpl.java
index 04afb8bb9..a5facd0ec 100644
--- a/service/java/com/android/server/wifi/WifiServiceImpl.java
+++ b/service/java/com/android/server/wifi/WifiServiceImpl.java
@@ -2211,6 +2211,9 @@ public class WifiServiceImpl extends IWifiManager.Stub {
             String[] ipManagerArgs = new String[args.length - 1];
             System.arraycopy(args, 1, ipManagerArgs, 0, ipManagerArgs.length);
             mWifiStateMachine.dumpIpManager(fd, pw, ipManagerArgs);
+        } else if (args != null && args.length > 0 && WifiScoreReport.DUMP_ARG.equals(args[0])) {
+            WifiScoreReport wifiScoreReport = mWifiStateMachine.getWifiScoreReport();
+            if (wifiScoreReport != null) wifiScoreReport.dump(fd, pw, args);
         } else {
             pw.println("Wi-Fi is " + mWifiStateMachine.syncGetWifiStateByName());
             pw.println("Stay-awake conditions: " +
@@ -2235,6 +2238,12 @@ public class WifiServiceImpl extends IWifiManager.Stub {
             pw.println();
             mWifiBackupRestore.dump(fd, pw, args);
             pw.println();
+            WifiScoreReport wifiScoreReport = mWifiStateMachine.getWifiScoreReport();
+            if (wifiScoreReport != null) {
+                pw.println("WifiScoreReport:");
+                wifiScoreReport.dump(fd, pw, args);
+            }
+            pw.println();
         }
     }
 
diff --git a/service/java/com/android/server/wifi/WifiStateMachine.java b/service/java/com/android/server/wifi/WifiStateMachine.java
index 06da92545..b12b63cff 100644
--- a/service/java/com/android/server/wifi/WifiStateMachine.java
+++ b/service/java/com/android/server/wifi/WifiStateMachine.java
@@ -221,6 +221,9 @@ public class WifiStateMachine extends StateMachine implements WifiNative.WifiRss
     private final WifiCountryCode mCountryCode;
     // Object holding most recent wifi score report and bad Linkspeed count
     private final WifiScoreReport mWifiScoreReport;
+    public WifiScoreReport getWifiScoreReport() {
+        return mWifiScoreReport;
+    }
     private final PasspointManager mPasspointManager;
 
     /* Scan results handling */
@@ -931,7 +934,7 @@ public class WifiStateMachine extends StateMachine implements WifiNative.WifiRss
 
         mCountryCode = countryCode;
 
-        mWifiScoreReport = new WifiScoreReport(mContext, mWifiConfigManager);
+        mWifiScoreReport = new WifiScoreReport(mContext, mWifiConfigManager, mClock);
 
         mUserWantsSuspendOpt.set(mFacade.getIntegerSetting(mContext,
                 Settings.Global.WIFI_SUSPEND_OPTIMIZATIONS_ENABLED, 1) == 1);