PROXY_SERVICE may be missing and its reference null.

Protect ourselves from when PROXY_SERVICE is missing
and mProxyService is null.

Bug: 10267814
Change-Id: Ia329376218e246cdde3d70b578c18466d48a6383

core/java/android/net/PacProxySelector.java

@@ -3,6 +3,7 @@ package android.net;
 
 import android.os.RemoteException;
 import android.os.ServiceManager;
+import android.util.Log;
 
 import com.android.net.IProxyService;
 import com.google.android.collect.Lists;
@@ -21,16 +22,25 @@ import java.util.List;
  * @hide
  */
 public class PacProxySelector extends ProxySelector {
+    private static final String TAG = "PacProxySelector";
     public static final String PROXY_SERVICE = "com.android.net.IProxyService";
     private IProxyService mProxyService;
 
     public PacProxySelector() {
         mProxyService = IProxyService.Stub.asInterface(
                 ServiceManager.getService(PROXY_SERVICE));
+        if (mProxyService == null) {
+            // Added because of b10267814 where mako is restarting.
+            Log.e(TAG, "PackManager: no proxy service");
+        }
     }
 
     @Override
     public List<Proxy> select(URI uri) {
+        if (mProxyService == null) {
+            Log.e(TAG, "select: no proxy service return NO_PROXY");
+            return Lists.newArrayList(java.net.Proxy.NO_PROXY);
+        }
         String response = null;
         String urlString;
         try {

services/java/com/android/server/connectivity/PacManager.java

@@ -83,6 +83,12 @@ public class PacManager implements Runnable {
         mContext = context;
         mProxyService = IProxyService.Stub.asInterface(
                 ServiceManager.getService(PROXY_SERVICE));
+        if (mProxyService == null) {
+            // Added because of b10267814 where mako is restarting.
+            Log.e(TAG, "PacManager: no proxy service");
+        } else {
+            Log.d(TAG, "PacManager: mProxyService available");
+        }
 
         mPacRefreshIntent = PendingIntent.getBroadcast(
                 context, 0, new Intent(ACTION_PAC_REFRESH), 0);
@@ -98,6 +104,10 @@ public class PacManager implements Runnable {
     }
 
     public void setCurrentProxyScriptUrl(ProxyProperties proxy) {
+        if (mProxyService == null) {
+            Log.e(TAG, "setCurrentProxyScriptUrl: no proxy service");
+            return;
+        }
         if (!TextUtils.isEmpty(proxy.getPacFileUrl())) {
             try {
                 mProxyService.startPacSystem();
@@ -212,6 +222,10 @@ public class PacManager implements Runnable {
     }
 
     private boolean setCurrentProxyScript(String script) {
+        if (mProxyService == null) {
+            Log.e(TAG, "setCurrentProxyScript: no proxy service");
+            return false;
+        }
         try {
             if (mProxyService.setPacFile(script) != NO_ERROR) {
                 Log.e(TAG, "Unable to parse proxy script.");