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/*
* Copyright (C) 2017 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.dialer.strictmode;
import android.app.Application;
import android.content.Context;
import android.os.Looper;
import android.os.StrictMode;
import android.os.StrictMode.ThreadPolicy;
import android.os.StrictMode.VmPolicy;
import android.preference.PreferenceManager;
import com.android.dialer.buildtype.BuildType;
import com.android.dialer.util.DialerUtils;
/** Enables strict mode for the application, and provides means of temporarily disabling it. */
public final class DialerStrictMode {
/** Initializes strict mode on application start. */
public static void onApplicationCreate(Application application) {
warmupSharedPrefs(application);
enableDeathPenalty();
}
/**
* We frequently access shared preferences on the main thread, which causes strict mode
* violations. When strict mode is allowed, warm up the shared preferences so that later uses of
* shared preferences access the in-memory versions and we don't have to bypass strict mode at
* every point in the application where shared preferences are accessed.
*/
private static void warmupSharedPrefs(Application application) {
if (isStrictModeAllowed()) {
// From credential-encrypted (CE) storage, i.e.:
// /data/data/com.google.android.dialer/shared_prefs
// com.google.android.dialer_preferences.xml
PreferenceManager.getDefaultSharedPreferences(application);
// com.google.android.dialer.xml
application.getSharedPreferences(application.getPackageName(), Context.MODE_PRIVATE);
// From device-encrypted (DE) storage, i.e.:
// /data/user_de/0/com.android.dialer/shared_prefs/
// com.google.android.dialer_preferences.xml
DialerUtils.getDefaultSharedPreferenceForDeviceProtectedStorageContext(application);
}
}
/**
* Disables the strict mode death penalty. If strict mode is enabled for the build, warnings are
* printed instead of the application crashing.
*
* <p>You should typically do this only temporarily and restore the death penalty in a finally
* block using {@link #enableDeathPenalty()}.
*
* <p>The thread policy is only mutated if this is called from the main thread.
*/
public static void disableDeathPenalty() {
if (isStrictModeAllowed()) {
if (onMainThread()) {
StrictMode.setThreadPolicy(threadPolicyTemplate().build());
}
StrictMode.setVmPolicy(vmPolicyTemplate().build());
}
}
/**
* Restore the death penalty. This should typically be called in a finally block after calling
* {@link #disableDeathPenalty()}.
*
* <p>The thread policy is only mutated if this is called from the main thread.
*/
public static void enableDeathPenalty() {
if (isStrictModeAllowed()) {
if (onMainThread()) {
StrictMode.setThreadPolicy(threadPolicyTemplate().penaltyDeath().build());
}
StrictMode.setVmPolicy(vmPolicyTemplate().penaltyDeath().build());
}
}
private static ThreadPolicy.Builder threadPolicyTemplate() {
return new StrictMode.ThreadPolicy.Builder().detectAll().penaltyLog();
}
private static VmPolicy.Builder vmPolicyTemplate() {
return new StrictMode.VmPolicy.Builder().detectAll().penaltyLog();
}
private static boolean isStrictModeAllowed() {
return BuildType.get() == BuildType.BUGFOOD;
}
private static boolean onMainThread() {
return Looper.getMainLooper().equals(Looper.myLooper());
}
/** Functional interface intended to be used with {@link #bypass(Provider)}. */
public interface Provider<T> {
T get();
}
/**
* Convenience method for disabling and enabling the death penalty using lambdas.
*
* <p>For example:
*
* <p><code>
* Value foo = DialerStrictMode.bypass(() -> doDiskAccessOnMainThreadReturningValue());
* </code>
*
* <p>The thread policy is only mutated if this is called from the main thread.
*/
public static <T> T bypass(Provider<T> provider) {
disableDeathPenalty();
try {
return provider.get();
} finally {
enableDeathPenalty();
}
}
/**
* Convenience method for disabling and enabling the death penalty using lambdas.
*
* <p>For example:
*
* <p><code>
* DialerStrictMode.bypass(() -> doDiskAccessOnMainThread());
* </code>
*/
public static void bypass(Runnable runnable) {
disableDeathPenalty();
try {
runnable.run();
} finally {
enableDeathPenalty();
}
}
}
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