Trigger bugreport for abnormally long connections

This is an effort investigate why certain connections take really long
to finish.

Users running user-debug builds will be shown an notification, which
they may tap on to file a bugreport.

Added GService flags (that is disabled by default) which may be
configured on the server side to enable this feature for a select group
of users. Also added a flag to fine tune the threshold at which
bugreports get triggered.

Bug: 132648941
Test: Unit tests
Test: mannually tested with a smaller threshold to verify bugreport is
triggering properly.
Test: Tested setting Gservices value with adb command "am broadcast -a
com.google.gservices.intent.action.GSERVICES_OVERRIDE -e
android.wifi.abnormal_connection_duration_ms 300"

Change-Id: I2f5f9c9c08874f6f356a081b0a2575dd3851c241

5 files changed, 153 insertions, 5 deletions

diff --git a/service/Android.mk b/service/Android.mk
index b396214c7..ab005867c 100644
--- a/service/Android.mk
+++ b/service/Android.mk
@@ -48,7 +48,8 @@ LOCAL_STATIC_JAVA_LIBRARIES := \
 	android.hardware.wifi.supplicant-V1.2-java \
 	wifi_service_proto \
 	ksoap2 \
-	libnanohttpd
+	libnanohttpd \
+	gsf-client
 
 LOCAL_REQUIRED_MODULES := \
 	services \
diff --git a/service/java/com/android/server/wifi/ClientModeImpl.java b/service/java/com/android/server/wifi/ClientModeImpl.java
index a18760c17..292e902bc 100644
--- a/service/java/com/android/server/wifi/ClientModeImpl.java
+++ b/service/java/com/android/server/wifi/ClientModeImpl.java
@@ -959,6 +959,8 @@ public class ClientModeImpl extends StateMachine {
                 mWifiMetrics.getHandler());
         mWifiMonitor.registerHandler(mInterfaceName, CMD_TARGET_BSSID,
                 mWifiMetrics.getHandler());
+        mWifiMonitor.registerHandler(mInterfaceName, WifiMonitor.NETWORK_CONNECTION_EVENT,
+                mWifiInjector.getWifiLastResortWatchdog().getHandler());
     }
 
     private void setMulticastFilter(boolean enabled) {
@@ -4292,6 +4294,7 @@ public class ClientModeImpl extends StateMachine {
                     }
 
                     if (mWifiNative.connectToNetwork(mInterfaceName, config)) {
+                        mWifiInjector.getWifiLastResortWatchdog().noteStartConnectTime();
                         mWifiMetrics.logStaEvent(StaEvent.TYPE_CMD_START_CONNECT, config);
                         mLastConnectAttemptTimestamp = mClock.getWallClockMillis();
                         mTargetWifiConfiguration = config;
diff --git a/service/java/com/android/server/wifi/GservicesFacade.java b/service/java/com/android/server/wifi/GservicesFacade.java
new file mode 100644
index 000000000..a629a584d
--- /dev/null
+++ b/service/java/com/android/server/wifi/GservicesFacade.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server.wifi;
+
+import android.content.Context;
+
+import com.google.android.gsf.Gservices;
+
+import java.util.concurrent.TimeUnit;
+
+/**
+ * This class allows getting all configurable flags from Gservices.
+ */
+public class GservicesFacade {
+    private static final int DEFAULT_ABNORMAL_CONNECTION_DURATION_MS =
+            (int) TimeUnit.SECONDS.toMillis(30);
+    private static final String G_PREFIX = "android.wifi.";
+    private Context mContext;
+
+    public GservicesFacade(Context context) {
+        mContext = context;
+    }
+
+    /**
+     * Gets the feature flag for reporting abnormally long connections.
+     */
+    public boolean isAbnormalConnectionBugreportEnabled() {
+        return Gservices.getBoolean(mContext.getContentResolver(),
+                G_PREFIX + "abnormal_connection_bugreport_enabled", false);
+    }
+
+    /**
+     * Gets the threshold for classifying abnormally long connections.
+     */
+    public int getAbnormalConnectionDurationMs() {
+        return Gservices.getInt(mContext.getContentResolver(),
+                G_PREFIX + "abnormal_connection_duration_ms",
+                DEFAULT_ABNORMAL_CONNECTION_DURATION_MS);
+    }
+}
diff --git a/service/java/com/android/server/wifi/WifiInjector.java b/service/java/com/android/server/wifi/WifiInjector.java
index f33c7cf93..a449ef332 100644
--- a/service/java/com/android/server/wifi/WifiInjector.java
+++ b/service/java/com/android/server/wifi/WifiInjector.java
@@ -82,6 +82,7 @@ public class WifiInjector {
 
     private final Context mContext;
     private final FrameworkFacade mFrameworkFacade = new FrameworkFacade();
+    private final GservicesFacade mGservicesFacade;
     private final HandlerThread mWifiServiceHandlerThread;
     private final HandlerThread mWifiCoreHandlerThread;
     private final HandlerThread mWifiP2pServiceHandlerThread;
@@ -168,6 +169,7 @@ public class WifiInjector {
         sWifiInjector = this;
 
         mContext = context;
+        mGservicesFacade = new GservicesFacade(mContext);
         mWifiScoreCard = new WifiScoreCard(mClock,
                 Secure.getString(mContext.getContentResolver(), Secure.ANDROID_ID));
         mSettingsStore = new WifiSettingsStore(mContext);
@@ -605,8 +607,9 @@ public class WifiInjector {
                 mWifiCoreHandlerThread.getLooper(), mFrameworkFacade, mClock, mWifiMetrics,
                 mWifiConfigManager, mWifiConfigStore, clientModeImpl,
                 new ConnectToNetworkNotificationBuilder(mContext, mFrameworkFacade));
-        mWifiLastResortWatchdog = new WifiLastResortWatchdog(this, mClock,
-                mWifiMetrics, clientModeImpl, clientModeImpl.getHandler().getLooper());
+        mWifiLastResortWatchdog = new WifiLastResortWatchdog(this, mContext, mClock,
+                mWifiMetrics, clientModeImpl, clientModeImpl.getHandler().getLooper(),
+                mGservicesFacade);
         return new WifiConnectivityManager(mContext, getScoringParams(),
                 clientModeImpl, this,
                 mWifiConfigManager, clientModeImpl.getWifiInfo(),
diff --git a/service/java/com/android/server/wifi/WifiLastResortWatchdog.java b/service/java/com/android/server/wifi/WifiLastResortWatchdog.java
index 6889b5016..868a3e9a5 100644
--- a/service/java/com/android/server/wifi/WifiLastResortWatchdog.java
+++ b/service/java/com/android/server/wifi/WifiLastResortWatchdog.java
@@ -16,10 +16,15 @@
 
 package com.android.server.wifi;
 
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
 import android.net.wifi.ScanResult;
 import android.net.wifi.WifiConfiguration;
 import android.os.Handler;
 import android.os.Looper;
+import android.os.Message;
 import android.text.TextUtils;
 import android.util.LocalLog;
 import android.util.Log;
@@ -27,6 +32,8 @@ import android.util.Pair;
 
 import com.android.internal.annotations.VisibleForTesting;
 
+import com.google.android.gsf.Gservices;
+
 import java.io.FileDescriptor;
 import java.io.PrintWriter;
 import java.util.HashMap;
@@ -75,6 +82,10 @@ public class WifiLastResortWatchdog {
     @VisibleForTesting
     public static final long LAST_TRIGGER_TIMEOUT_MILLIS = 2 * 3600 * 1000; // 2 hours
 
+    private int mAbnormalConnectionDurationMs;
+    private boolean mAbnormalConnectionBugreportEnabled;
+
+
     /**
      * Cached WifiConfigurations of available networks seen within MAX_BSSID_AGE scan results
      * Key:BSSID, Value:Counters of failure types
@@ -102,22 +113,98 @@ public class WifiLastResortWatchdog {
     private Looper mClientModeImplLooper;
     private double mBugReportProbability = PROB_TAKE_BUGREPORT_DEFAULT;
     private Clock mClock;
+    private Context mContext;
+    private GservicesFacade mGservicesFacade;
     // If any connection failure happened after watchdog triggering restart then assume watchdog
     // did not fix the problem
     private boolean mWatchdogFixedWifi = true;
+    private long mLastStartConnectTime = 0;
+    private Handler mHandler;
 
     /**
      * Local log used for debugging any WifiLastResortWatchdog issues.
      */
     private final LocalLog mLocalLog = new LocalLog(100);
 
-    WifiLastResortWatchdog(WifiInjector wifiInjector, Clock clock, WifiMetrics wifiMetrics,
-            ClientModeImpl clientModeImpl, Looper clientModeImplLooper) {
+    WifiLastResortWatchdog(WifiInjector wifiInjector, Context context, Clock clock,
+            WifiMetrics wifiMetrics, ClientModeImpl clientModeImpl, Looper clientModeImplLooper,
+            GservicesFacade gservicesFacade) {
         mWifiInjector = wifiInjector;
         mClock = clock;
         mWifiMetrics = wifiMetrics;
         mClientModeImpl = clientModeImpl;
         mClientModeImplLooper = clientModeImplLooper;
+        mContext = context;
+        mGservicesFacade = gservicesFacade;
+        updateGServicesFlags();
+        mHandler = new Handler(clientModeImplLooper) {
+            public void handleMessage(Message msg) {
+                processMessage(msg);
+            }
+        };
+        // Registers a broadcast receiver to change update G service flags
+        mContext.registerReceiver(
+                new BroadcastReceiver() {
+                    @Override
+                    public void onReceive(Context context, Intent intent) {
+                        mHandler.post(() -> {
+                            updateGServicesFlags();
+                        });
+                    }
+                },
+                new IntentFilter(Gservices.CHANGED_ACTION));
+    }
+
+    private void updateGServicesFlags() {
+        mAbnormalConnectionBugreportEnabled =
+                mGservicesFacade.isAbnormalConnectionBugreportEnabled();
+        mAbnormalConnectionDurationMs =
+                mGservicesFacade.getAbnormalConnectionDurationMs();
+        logv("updateGServicesFlags: mAbnormalConnectionDurationMs = "
+                + mAbnormalConnectionDurationMs
+                + ", mAbnormalConnectionBugreportEnabled = "
+                + mAbnormalConnectionBugreportEnabled);
+    }
+
+    /**
+     * Returns handler for L2 events from supplicant.
+     * @return Handler
+     */
+    public Handler getHandler() {
+        return mHandler;
+    }
+
+    /**
+     * Refreshes when the last CMD_START_CONNECT is triggered.
+     */
+    public void noteStartConnectTime() {
+        mLastStartConnectTime = mClock.getElapsedSinceBootMillis();
+    }
+
+    private void processMessage(Message msg) {
+        switch (msg.what) {
+            case WifiMonitor.NETWORK_CONNECTION_EVENT:
+                // Trigger bugreport for successful connections that take abnormally long
+                if (mAbnormalConnectionBugreportEnabled && mLastStartConnectTime > 0) {
+                    long durationMs = mClock.getElapsedSinceBootMillis() - mLastStartConnectTime;
+                    if (durationMs > mAbnormalConnectionDurationMs) {
+                        final String bugTitle = "Wi-Fi Bugreport: Abnormal connection time";
+                        final String bugDetail = "Expected connection to take less than "
+                                + mAbnormalConnectionDurationMs + " milliseconds. "
+                                + "Actually took " + durationMs + " milliseconds.";
+                        logv("Triggering bug report for abnormal connection time.");
+                        mWifiInjector.getClientModeImplHandler().post(() -> {
+                            mClientModeImpl.takeBugReport(bugTitle, bugDetail);
+                        });
+                    }
+                }
+                // Should reset last connection time after each connection regardless if bugreport
+                // is enabled or not.
+                mLastStartConnectTime = 0;
+                break;
+            default:
+                return;
+        }
     }
 
     /**