Bootstrap IInputFlingerRust - the Rust component of inputflinger (44e6e832) · Commits · e / os / android_frameworks_native

services/inputflinger/Android.bp

+9 −0

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		@@ -87,6 +87,7 @@ cc_defaults {
		srcs: [":libinputflinger_sources"],
		shared_libs: [
		"android.hardware.input.processor-V1-ndk",
		"com.android.server.inputflinger-ndk",
		"libbase",
		"libbinder",
		"libbinder_ndk",
		@@ -107,6 +108,14 @@ cc_defaults {
		"libpalmrejection",
		"libui-types",
		],
		generated_headers: [
		"cxx-bridge-header",
		"inputflinger_rs_bootstrap_bridge_header",
		],
		header_libs: ["inputflinger_rs_bootstrap_cxx_headers"],
		generated_sources: ["inputflinger_rs_bootstrap_bridge_code"],
		whole_static_libs: ["libinputflinger_rs"],
		export_shared_lib_headers: ["com.android.server.inputflinger-ndk"],
		target: {
		android: {
		shared_libs: [

services/inputflinger/InputManager.cpp

+62 −8

Original line number	Diff line number	Diff line
		@@ -23,22 +23,22 @@
		#include "InputReaderFactory.h"
		#include "UnwantedInteractionBlocker.h"

		#include <aidl/com/android/server/inputflinger/IInputFlingerRust.h>
		#include <android/binder_interface_utils.h>
		#include <android/sysprop/InputProperties.sysprop.h>
		#include <binder/IPCThreadState.h>

		#include <inputflinger_bootstrap.rs.h>
		#include <log/log.h>
		#include <unordered_map>

		#include <private/android_filesystem_config.h>

		namespace android {

		static const bool ENABLE_INPUT_DEVICE_USAGE_METRICS =
		sysprop::InputProperties::enable_input_device_usage_metrics().value_or(true);
		namespace {

		using gui::FocusRequest;
		const bool ENABLE_INPUT_DEVICE_USAGE_METRICS =
		sysprop::InputProperties::enable_input_device_usage_metrics().value_or(true);

		static int32_t exceptionCodeFromStatusT(status_t status) {
		int32_t exceptionCodeFromStatusT(status_t status) {
		switch (status) {
		case OK:
		return binder::Status::EX_NONE;
		@@ -57,6 +57,58 @@ static int32_t exceptionCodeFromStatusT(status_t status) {
		}
		}

		// Convert a binder interface into a raw pointer to an AIBinder.
		using IInputFlingerRustBootstrapCallback = aidl::com::android::server::inputflinger::
		IInputFlingerRust::IInputFlingerRustBootstrapCallback;
		IInputFlingerRustBootstrapCallbackAIBinder* binderToPointer(
		IInputFlingerRustBootstrapCallback& interface) {
		ndk::SpAIBinder spAIBinder = interface.asBinder();
		auto* ptr = spAIBinder.get();
		AIBinder_incStrong(ptr);
		return ptr;
		}

		// Create the Rust component of InputFlinger that uses AIDL interfaces as a the foreign function
		// interface (FFI). The bootstraping process for IInputFlingerRust is as follows:
		// - Create BnInputFlingerRustBootstrapCallback in C++.
		// - Use the cxxbridge ffi interface to call the Rust function `create_inputflinger_rust()`, and
		// pass the callback binder object as a raw pointer.
		// - The Rust implementation will create the implementation of IInputFlingerRust, and pass it
		// to C++ through the callback.
		// - After the Rust function returns, the binder interface provided to the callback will be the
		// only strong reference to the IInputFlingerRust.
		std::shared_ptr<IInputFlingerRust> createInputFlingerRust() {
		using namespace aidl::com::android::server::inputflinger;

		class Callback : public IInputFlingerRust::BnInputFlingerRustBootstrapCallback {
		ndk::ScopedAStatus onProvideInputFlingerRust(
		const std::shared_ptr<IInputFlingerRust>& inputFlingerRust) override {
		mService = inputFlingerRust;
		return ndk::ScopedAStatus::ok();
		}

		public:
		std::shared_ptr<IInputFlingerRust> consumeInputFlingerRust() {
		auto service = mService;
		mService.reset();
		return service;
		}

		private:
		std::shared_ptr<IInputFlingerRust> mService;
		};

		auto callback = ndk::SharedRefBase::make<Callback>();
		create_inputflinger_rust(binderToPointer(*callback));
		auto service = callback->consumeInputFlingerRust();
		LOG_ALWAYS_FATAL_IF(!service,
		"create_inputflinger_rust did not provide the IInputFlingerRust "
		"implementation through the callback.");
		return service;
		}

		} // namespace

		/**
		* The event flow is via the "InputListener" interface, as follows:
		* InputReader
		@@ -67,6 +119,8 @@ static int32_t exceptionCodeFromStatusT(status_t status) {
		*/
		InputManager::InputManager(const sp<InputReaderPolicyInterface>& readerPolicy,
		InputDispatcherPolicyInterface& dispatcherPolicy) {
		mInputFlingerRust = createInputFlingerRust();

		mDispatcher = createInputDispatcher(dispatcherPolicy);

		if (ENABLE_INPUT_DEVICE_USAGE_METRICS) {
		@@ -190,7 +244,7 @@ status_t InputManager::dump(int fd, const Vector<String16>& args) {
		return NO_ERROR;
		}

		binder::Status InputManager::setFocusedWindow(const FocusRequest& request) {
		binder::Status InputManager::setFocusedWindow(const gui::FocusRequest& request) {
		mDispatcher->setFocusedWindow(request);
		return binder::Status::ok();
		}

services/inputflinger/InputManager.h

+5 −0

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		@@ -30,6 +30,7 @@
		#include <input/Input.h>
		#include <input/InputTransport.h>

		#include <aidl/com/android/server/inputflinger/IInputFlingerRust.h>
		#include <android/os/BnInputFlinger.h>
		#include <utils/Errors.h>
		#include <utils/RefBase.h>
		@@ -37,6 +38,8 @@

		using android::os::BnInputFlinger;

		using aidl::com::android::server::inputflinger::IInputFlingerRust;

		namespace android {
		class InputChannel;
		class InputDispatcherThread;
		@@ -132,6 +135,8 @@ private:
		std::unique_ptr<InputDeviceMetricsCollectorInterface> mCollector;

		std::unique_ptr<InputDispatcherInterface> mDispatcher;

		std::shared_ptr<IInputFlingerRust> mInputFlingerRust;
		};

		} // namespace android

services/inputflinger/aidl/Android.bp

0 → 100644

+31 −0

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		// Copyright 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.

		aidl_interface {
		name: "com.android.server.inputflinger",
		srcs: ["*/.aidl"],
		unstable: true,
		host_supported: true,
		backend: {
		cpp: {
		enabled: false,
		},
		java: {
		enabled: false,
		},
		rust: {
		enabled: true,
		},
		},
		}

services/inputflinger/aidl/com/android/server/inputflinger/IInputFlingerRust.aidl

0 → 100644

+34 −0

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		/*
		* Copyright 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.server.inputflinger;

		/**
		* A local AIDL interface used as a foreign function interface (ffi) to
		* communicate with the Rust component of inputflinger.
		*
		* NOTE: Since we use this as a local interface, all processing happens on the
		* calling thread.
		*/
		interface IInputFlingerRust {

		/**
		* An interface used to get a strong reference to IInputFlingerRust on boot.
		*/
		interface IInputFlingerRustBootstrapCallback {
		void onProvideInputFlingerRust(in IInputFlingerRust inputFlingerRust);
		}
		}