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/**
* Copyright (C) 2023 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.quickstep;
import static android.os.IBinder.FLAG_ONEWAY;
import android.os.Binder;
import android.os.Binder.ProxyTransactListener;
import android.os.IBinder;
import android.os.Looper;
import android.os.RemoteException;
import android.os.Trace;
import android.util.Log;
import androidx.annotation.Nullable;
import com.android.launcher3.util.SafeCloseable;
import com.android.launcher3.util.TraceHelper;
import java.util.LinkedList;
import java.util.Set;
import java.util.function.Consumer;
import kotlin.random.Random;
/**
* A binder proxy transaction listener for tracking binder calls on main thread.
*/
public class BinderTracker {
private static final String TAG = "BinderTracker";
// Common IPCs that are ok to block the main thread.
private static final Set<String> sAllowedFrameworkClasses = Set.of(
"android.view.IWindowSession",
"android.os.IPowerManager",
"android.os.IServiceManager");
/**
* Starts tracking binder class and returns a {@link SafeCloseable} to end tracking
*/
public static SafeCloseable startTracking(Consumer<BinderCallSite> callback) {
TraceHelper current = TraceHelper.INSTANCE;
TraceHelperExtension helper = new TraceHelperExtension(callback);
TraceHelper.INSTANCE = helper;
Binder.setProxyTransactListener(helper);
return () -> {
Binder.setProxyTransactListener(null);
TraceHelper.INSTANCE = current;
};
}
private static final LinkedList<String> mMainThreadTraceStack = new LinkedList<>();
private static final LinkedList<String> mMainThreadIgnoreIpcStack = new LinkedList<>();
private static class TraceHelperExtension extends TraceHelper implements ProxyTransactListener {
private final Consumer<BinderCallSite> mUnexpectedTransactionCallback;
TraceHelperExtension(Consumer<BinderCallSite> unexpectedTransactionCallback) {
mUnexpectedTransactionCallback = unexpectedTransactionCallback;
}
@Override
public void beginSection(String sectionName) {
if (isMainThread()) {
mMainThreadTraceStack.add(sectionName);
}
super.beginSection(sectionName);
}
@Override
public SafeCloseable beginAsyncSection(String sectionName) {
if (!isMainThread()) {
return super.beginAsyncSection(sectionName);
}
mMainThreadTraceStack.add(sectionName);
int cookie = Random.Default.nextInt();
Trace.beginAsyncSection(sectionName, cookie);
return () -> {
Trace.endAsyncSection(sectionName, cookie);
mMainThreadTraceStack.remove(sectionName);
};
}
@Override
public void endSection() {
super.endSection();
if (isMainThread()) {
mMainThreadTraceStack.pollLast();
}
}
@Override
public SafeCloseable allowIpcs(String rpcName) {
if (!isMainThread()) {
return super.allowIpcs(rpcName);
}
mMainThreadTraceStack.add(rpcName);
mMainThreadIgnoreIpcStack.add(rpcName);
int cookie = Random.Default.nextInt();
Trace.beginAsyncSection(rpcName, cookie);
return () -> {
Trace.endAsyncSection(rpcName, cookie);
mMainThreadTraceStack.remove(rpcName);
mMainThreadIgnoreIpcStack.remove(rpcName);
};
}
@Override
public Object onTransactStarted(IBinder binder, int transactionCode, int flags) {
if (!isMainThread() || (flags & FLAG_ONEWAY) == FLAG_ONEWAY) {
return null;
}
String ipcBypass = mMainThreadIgnoreIpcStack.peekLast();
String descriptor;
try {
descriptor = binder.getInterfaceDescriptor();
if (sAllowedFrameworkClasses.contains(descriptor)) {
return null;
}
} catch (RemoteException e) {
Log.e(TAG, "Error getting IPC descriptor", e);
descriptor = binder.getClass().getSimpleName();
}
if (ipcBypass == null) {
mUnexpectedTransactionCallback.accept(new BinderCallSite(
mMainThreadTraceStack.peekLast(), descriptor, transactionCode));
} else {
Log.d(TAG, "MainThread-IPC " + descriptor + " ignored due to " + ipcBypass);
}
return null;
}
@Override
public Object onTransactStarted(IBinder binder, int transactionCode) {
// Do nothing
return null;
}
@Override
public void onTransactEnded(Object session) {
// Do nothing
}
}
private static boolean isMainThread() {
return Thread.currentThread() == Looper.getMainLooper().getThread();
}
/**
* Information about a binder call
*/
public static class BinderCallSite {
@Nullable
public final String activeTrace;
public final String descriptor;
public final int transactionCode;
BinderCallSite(String activeTrace, String descriptor, int transactionCode) {
this.activeTrace = activeTrace;
this.descriptor = descriptor;
this.transactionCode = transactionCode;
}
}
}
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