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/*
* Copyright 2024 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.
*/
#include "FakeInputTracingBackend.h"
#include <android-base/logging.h>
#include <utils/Errors.h>
namespace android::inputdispatcher {
namespace {
// Use a larger timeout while waiting for events to be traced, compared to the timeout used while
// waiting to receive events through the input channel. Events are traced from a separate thread,
// which does not have the same high thread priority as the InputDispatcher's thread, so the tracer
// is expected to lag behind the Dispatcher at times.
constexpr auto TRACE_TIMEOUT = std::chrono::seconds(5);
base::ResultError<> error(const std::ostringstream& ss) {
return base::ResultError(ss.str(), BAD_VALUE);
}
inline auto getId(const trace::TracedEvent& v) {
return std::visit([](const auto& event) { return event.id; }, v);
}
MotionEvent toInputEvent(
const trace::TracedMotionEvent& e,
const trace::InputTracingBackendInterface::WindowDispatchArgs& dispatchArgs,
const std::array<uint8_t, 32>& hmac) {
MotionEvent traced;
traced.initialize(e.id, e.deviceId, e.source, e.displayId, hmac, e.action, e.actionButton,
dispatchArgs.resolvedFlags, e.edgeFlags, e.metaState, e.buttonState,
e.classification, dispatchArgs.transform, e.xPrecision, e.yPrecision,
e.xCursorPosition, e.yCursorPosition, dispatchArgs.rawTransform, e.downTime,
e.eventTime, e.pointerProperties.size(), e.pointerProperties.data(),
e.pointerCoords.data());
return traced;
}
KeyEvent toInputEvent(const trace::TracedKeyEvent& e,
const trace::InputTracingBackendInterface::WindowDispatchArgs& dispatchArgs,
const std::array<uint8_t, 32>& hmac) {
KeyEvent traced;
traced.initialize(e.id, e.deviceId, e.source, e.displayId, hmac, e.action,
dispatchArgs.resolvedFlags, e.keyCode, e.scanCode, e.metaState, e.repeatCount,
e.downTime, e.eventTime);
return traced;
}
} // namespace
// --- VerifyingTrace ---
void VerifyingTrace::expectKeyDispatchTraced(const KeyEvent& event, int32_t windowId) {
std::scoped_lock lock(mLock);
mExpectedEvents.emplace_back(event, windowId);
}
void VerifyingTrace::expectMotionDispatchTraced(const MotionEvent& event, int32_t windowId) {
std::scoped_lock lock(mLock);
mExpectedEvents.emplace_back(event, windowId);
}
void VerifyingTrace::verifyExpectedEventsTraced() {
std::unique_lock lock(mLock);
base::ScopedLockAssertion assumeLocked(mLock);
// Poll for all expected events to be traced, and keep track of the latest poll result.
base::Result<void> result;
mEventTracedCondition.wait_for(lock, TRACE_TIMEOUT, [&]() REQUIRES(mLock) {
for (const auto& [expectedEvent, windowId] : mExpectedEvents) {
std::visit([&](const auto& event)
REQUIRES(mLock) { result = verifyEventTraced(event, windowId); },
expectedEvent);
if (!result.ok()) {
return false;
}
}
return true;
});
EXPECT_TRUE(result.ok())
<< "Timed out waiting for all expected events to be traced successfully: "
<< result.error().message();
}
void VerifyingTrace::reset() {
std::scoped_lock lock(mLock);
mTracedEvents.clear();
mTracedWindowDispatches.clear();
mExpectedEvents.clear();
}
template <typename Event>
base::Result<void> VerifyingTrace::verifyEventTraced(const Event& expectedEvent,
int32_t expectedWindowId) const {
std::ostringstream msg;
auto tracedEventsIt = mTracedEvents.find(expectedEvent.getId());
if (tracedEventsIt == mTracedEvents.end()) {
msg << "Expected event with ID 0x" << std::hex << expectedEvent.getId()
<< " to be traced, but it was not.\n"
<< "Expected event: " << expectedEvent;
return error(msg);
}
auto tracedDispatchesIt =
std::find_if(mTracedWindowDispatches.begin(), mTracedWindowDispatches.end(),
[&](const WindowDispatchArgs& args) {
return args.windowId == expectedWindowId &&
getId(args.eventEntry) == expectedEvent.getId();
});
if (tracedDispatchesIt == mTracedWindowDispatches.end()) {
msg << "Expected dispatch of event with ID 0x" << std::hex << expectedEvent.getId()
<< " to window with ID 0x" << expectedWindowId << " to be traced, but it was not.\n"
<< "Expected event: " << expectedEvent;
return error(msg);
}
// Verify that the traced event matches the expected event exactly.
return std::visit(
[&](const auto& traced) -> base::Result<void> {
Event tracedEvent;
using T = std::decay_t<decltype(traced)>;
if constexpr (std::is_same_v<Event, MotionEvent> &&
std::is_same_v<T, trace::TracedMotionEvent>) {
tracedEvent =
toInputEvent(traced, *tracedDispatchesIt, expectedEvent.getHmac());
} else if constexpr (std::is_same_v<Event, KeyEvent> &&
std::is_same_v<T, trace::TracedKeyEvent>) {
tracedEvent =
toInputEvent(traced, *tracedDispatchesIt, expectedEvent.getHmac());
} else {
msg << "Received the wrong event type!\n"
<< "Expected event: " << expectedEvent;
return error(msg);
}
const auto result = testing::internal::CmpHelperEQ("expectedEvent", "tracedEvent",
expectedEvent, tracedEvent);
if (!result) {
msg << result.failure_message();
return error(msg);
}
return {};
},
tracedEventsIt->second);
}
// --- FakeInputTracingBackend ---
void FakeInputTracingBackend::traceKeyEvent(const trace::TracedKeyEvent& event) {
{
std::scoped_lock lock(mTrace->mLock);
mTrace->mTracedEvents.emplace(event.id, event);
}
mTrace->mEventTracedCondition.notify_all();
}
void FakeInputTracingBackend::traceMotionEvent(const trace::TracedMotionEvent& event) {
{
std::scoped_lock lock(mTrace->mLock);
mTrace->mTracedEvents.emplace(event.id, event);
}
mTrace->mEventTracedCondition.notify_all();
}
void FakeInputTracingBackend::traceWindowDispatch(const WindowDispatchArgs& args) {
{
std::scoped_lock lock(mTrace->mLock);
mTrace->mTracedWindowDispatches.push_back(args);
}
mTrace->mEventTracedCondition.notify_all();
}
} // namespace android::inputdispatcher
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