Ensure channel receives a consistent touch stream
Add an event verifier to check the touch streams that are being sent to
the input channel.
If a stream is inconsistent, crash.
For now, only touch streams are being verified. Disable the feature
while the bugs are being fixed.
Bug: 267082966
Test: m inputflinger_tests && $ANDROID_HOST_OUT/nativetest64/inputflinger_tests/inputflinger_tests
Merged-In: Ibb8ab70b0019789c1a17dae0077be6b23d3d9139
Change-Id: Ibb8ab70b0019789c1a17dae0077be6b23d3d9139
(cherry picked from commit f06b672b3e433121037398c7255098ed0130c649)
diff --git a/libs/input/Android.bp b/libs/input/Android.bp
index 3809b6d..48cb72c 100644
--- a/libs/input/Android.bp
+++ b/libs/input/Android.bp
@@ -47,6 +47,7 @@
"Input.cpp",
"InputDevice.cpp",
"InputEventLabels.cpp",
+ "InputVerifier.cpp",
"Keyboard.cpp",
"KeyCharacterMap.cpp",
"KeyLayoutMap.cpp",
diff --git a/libs/input/InputTransport.cpp b/libs/input/InputTransport.cpp
index 9f0a314..d1cd50c 100644
--- a/libs/input/InputTransport.cpp
+++ b/libs/input/InputTransport.cpp
@@ -76,6 +76,14 @@
*/
static const char* PROPERTY_RESAMPLING_ENABLED = "ro.input.resampling";
+/**
+ * Crash if the events that are getting sent to the InputPublisher are inconsistent.
+ * Enable this via "adb shell setprop log.tag.InputTransportVerifyEvents DEBUG"
+ */
+static bool verifyEvents() {
+ return __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG "VerifyEvents", ANDROID_LOG_INFO);
+}
+
template<typename T>
inline static T min(const T& a, const T& b) {
return a < b ? a : b;
@@ -492,7 +500,8 @@
// --- InputPublisher ---
-InputPublisher::InputPublisher(const std::shared_ptr<InputChannel>& channel) : mChannel(channel) {}
+InputPublisher::InputPublisher(const std::shared_ptr<InputChannel>& channel)
+ : mChannel(channel), mInputVerifier(channel->getName()) {}
InputPublisher::~InputPublisher() {
}
@@ -555,6 +564,10 @@
mChannel->getName().c_str(), action);
ATRACE_NAME(message.c_str());
}
+ if (verifyEvents()) {
+ mInputVerifier.processMovement(deviceId, action, pointerCount, pointerProperties,
+ pointerCoords, flags);
+ }
if (DEBUG_TRANSPORT_ACTIONS) {
std::string transformString;
transform.dump(transformString, "transform", " ");
diff --git a/libs/input/InputVerifier.cpp b/libs/input/InputVerifier.cpp
new file mode 100644
index 0000000..eb75804
--- /dev/null
+++ b/libs/input/InputVerifier.cpp
@@ -0,0 +1,128 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "InputVerifier"
+
+#include <android-base/logging.h>
+#include <input/InputVerifier.h>
+
+namespace android {
+
+/**
+ * Log all of the movements that are sent to this verifier. Helps to identify the streams that lead
+ * to inconsistent events.
+ * Enable this via "adb shell setprop log.tag.InputVerifierLogEvents DEBUG"
+ */
+static bool logEvents() {
+ return __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG "LogEvents", ANDROID_LOG_INFO);
+}
+
+// --- InputVerifier ---
+
+InputVerifier::InputVerifier(const std::string& name) : mName(name){};
+
+void InputVerifier::processMovement(int32_t deviceId, int32_t action, uint32_t pointerCount,
+ const PointerProperties* pointerProperties,
+ const PointerCoords* pointerCoords, int32_t flags) {
+ if (logEvents()) {
+ LOG(ERROR) << "Processing " << MotionEvent::actionToString(action) << " for device "
+ << deviceId << " (" << pointerCount << " pointer"
+ << (pointerCount == 1 ? "" : "s") << ") on " << mName;
+ }
+
+ switch (MotionEvent::getActionMasked(action)) {
+ case AMOTION_EVENT_ACTION_DOWN: {
+ auto [it, inserted] = mTouchingPointerIdsByDevice.insert({deviceId, {}});
+ if (!inserted) {
+ LOG(FATAL) << "Got ACTION_DOWN, but already have touching pointers " << it->second
+ << " for device " << deviceId << " on " << mName;
+ }
+ it->second.set(pointerProperties[0].id);
+ break;
+ }
+ case AMOTION_EVENT_ACTION_POINTER_DOWN: {
+ auto it = mTouchingPointerIdsByDevice.find(deviceId);
+ if (it == mTouchingPointerIdsByDevice.end()) {
+ LOG(FATAL) << "Got POINTER_DOWN, but no touching pointers for device " << deviceId
+ << " on " << mName;
+ }
+ it->second.set(pointerProperties[MotionEvent::getActionIndex(action)].id);
+ break;
+ }
+ case AMOTION_EVENT_ACTION_MOVE: {
+ ensureTouchingPointersMatch(deviceId, pointerCount, pointerProperties, "MOVE");
+ break;
+ }
+ case AMOTION_EVENT_ACTION_POINTER_UP: {
+ auto it = mTouchingPointerIdsByDevice.find(deviceId);
+ if (it == mTouchingPointerIdsByDevice.end()) {
+ LOG(FATAL) << "Got POINTER_UP, but no touching pointers for device " << deviceId
+ << " on " << mName;
+ }
+ it->second.reset(pointerProperties[MotionEvent::getActionIndex(action)].id);
+ break;
+ }
+ case AMOTION_EVENT_ACTION_UP: {
+ auto it = mTouchingPointerIdsByDevice.find(deviceId);
+ if (it == mTouchingPointerIdsByDevice.end()) {
+ LOG(FATAL) << "Got ACTION_UP, but no record for deviceId " << deviceId << " on "
+ << mName;
+ }
+ const auto& [_, touchingPointerIds] = *it;
+ if (touchingPointerIds.count() != 1) {
+ LOG(FATAL) << "Got ACTION_UP, but we have pointers: " << touchingPointerIds
+ << " for deviceId " << deviceId << " on " << mName;
+ }
+ const int32_t pointerId = pointerProperties[0].id;
+ if (!touchingPointerIds.test(pointerId)) {
+ LOG(FATAL) << "Got ACTION_UP, but pointerId " << pointerId
+ << " is not touching. Touching pointers: " << touchingPointerIds
+ << " for deviceId " << deviceId << " on " << mName;
+ }
+ mTouchingPointerIdsByDevice.erase(it);
+ break;
+ }
+ case AMOTION_EVENT_ACTION_CANCEL: {
+ if ((flags & AMOTION_EVENT_FLAG_CANCELED) != AMOTION_EVENT_FLAG_CANCELED) {
+ LOG(FATAL) << "For ACTION_CANCEL, must set FLAG_CANCELED";
+ }
+ ensureTouchingPointersMatch(deviceId, pointerCount, pointerProperties, "CANCEL");
+ mTouchingPointerIdsByDevice.erase(deviceId);
+ break;
+ }
+ }
+}
+
+void InputVerifier::ensureTouchingPointersMatch(int32_t deviceId, uint32_t pointerCount,
+ const PointerProperties* pointerProperties,
+ const char* action) const {
+ auto it = mTouchingPointerIdsByDevice.find(deviceId);
+ if (it == mTouchingPointerIdsByDevice.end()) {
+ LOG(FATAL) << "Got " << action << ", but no touching pointers for device " << deviceId
+ << " on " << mName;
+ }
+ const auto& [_, touchingPointerIds] = *it;
+ for (size_t i = 0; i < pointerCount; i++) {
+ const int32_t pointerId = pointerProperties[i].id;
+ if (!touchingPointerIds.test(pointerId)) {
+ LOG(FATAL) << "Got " << action << " for pointerId " << pointerId
+ << " but the touching pointers are " << touchingPointerIds << " on "
+ << mName;
+ }
+ }
+};
+
+} // namespace android