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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.
*/
#define LOG_TAG "InputTracer"
#include "InputTracer.h"
#include <android-base/logging.h>
namespace android::inputdispatcher::trace::impl {
namespace {
// Helper to std::visit with lambdas.
template <typename... V>
struct Visitor : V... {
using V::operator()...;
};
TracedEvent createTracedEvent(const MotionEntry& e) {
return TracedMotionEvent{e.id,
e.eventTime,
e.policyFlags,
e.deviceId,
e.source,
e.displayId,
e.action,
e.actionButton,
e.flags,
e.metaState,
e.buttonState,
e.classification,
e.edgeFlags,
e.xPrecision,
e.yPrecision,
e.xCursorPosition,
e.yCursorPosition,
e.downTime,
e.pointerProperties,
e.pointerCoords};
}
TracedEvent createTracedEvent(const KeyEntry& e) {
return TracedKeyEvent{e.id, e.eventTime, e.policyFlags, e.deviceId, e.source,
e.displayId, e.action, e.keyCode, e.scanCode, e.metaState,
e.downTime, e.flags, e.repeatCount};
}
} // namespace
// --- InputTracer ---
InputTracer::InputTracer(std::unique_ptr<InputTracingBackendInterface> backend)
: mBackend(std::move(backend)) {}
std::unique_ptr<EventTrackerInterface> InputTracer::traceInboundEvent(const EventEntry& entry) {
TracedEvent traced;
if (entry.type == EventEntry::Type::MOTION) {
const auto& motion = static_cast<const MotionEntry&>(entry);
traced = createTracedEvent(motion);
} else if (entry.type == EventEntry::Type::KEY) {
const auto& key = static_cast<const KeyEntry&>(entry);
traced = createTracedEvent(key);
} else {
LOG(FATAL) << "Cannot trace EventEntry of type: " << ftl::enum_string(entry.type);
}
return std::make_unique<EventTrackerImpl>(*this, std::move(traced));
}
void InputTracer::dispatchToTargetHint(const EventTrackerInterface& cookie,
const InputTarget& target) {
auto& cookieState = getState(cookie);
if (!cookieState) {
LOG(FATAL) << "dispatchToTargetHint() should not be called after eventProcessingComplete()";
}
// TODO(b/210460522): Determine if the event is sensitive based on the target.
}
void InputTracer::eventProcessingComplete(const EventTrackerInterface& cookie) {
auto& cookieState = getState(cookie);
if (!cookieState) {
LOG(FATAL) << "Traced event was already logged. "
"eventProcessingComplete() was likely called more than once.";
}
std::visit(Visitor{[&](const TracedMotionEvent& e) { mBackend->traceMotionEvent(e); },
[&](const TracedKeyEvent& e) { mBackend->traceKeyEvent(e); }},
cookieState->event);
cookieState.reset();
}
void InputTracer::traceEventDispatch(const DispatchEntry& dispatchEntry,
const EventTrackerInterface* cookie) {
const EventEntry& entry = *dispatchEntry.eventEntry;
TracedEvent traced;
if (entry.type == EventEntry::Type::MOTION) {
const auto& motion = static_cast<const MotionEntry&>(entry);
traced = createTracedEvent(motion);
} else if (entry.type == EventEntry::Type::KEY) {
const auto& key = static_cast<const KeyEntry&>(entry);
traced = createTracedEvent(key);
} else {
LOG(FATAL) << "Cannot trace EventEntry of type: " << ftl::enum_string(entry.type);
}
if (!cookie) {
// This event was not tracked as an inbound event, so trace it now.
std::visit(Visitor{[&](const TracedMotionEvent& e) { mBackend->traceMotionEvent(e); },
[&](const TracedKeyEvent& e) { mBackend->traceKeyEvent(e); }},
traced);
}
// The vsyncId only has meaning if the event is targeting a window.
const int32_t windowId = dispatchEntry.windowId.value_or(0);
const int32_t vsyncId = dispatchEntry.windowId.has_value() ? dispatchEntry.vsyncId : 0;
mBackend->traceWindowDispatch({std::move(traced), dispatchEntry.deliveryTime,
dispatchEntry.resolvedFlags, dispatchEntry.targetUid, vsyncId,
windowId, dispatchEntry.transform, dispatchEntry.rawTransform,
/*hmac=*/{}});
}
std::optional<InputTracer::EventState>& InputTracer::getState(const EventTrackerInterface& cookie) {
return static_cast<const EventTrackerImpl&>(cookie).mState;
}
// --- InputTracer::EventTrackerImpl ---
InputTracer::EventTrackerImpl::EventTrackerImpl(InputTracer& tracer, TracedEvent&& event)
: mTracer(tracer), mState(event) {}
InputTracer::EventTrackerImpl::~EventTrackerImpl() {
if (!mState) {
// This event has already been written to the trace as expected.
return;
}
// We're still holding on to the state, which means it hasn't yet been written to the trace.
// Write it to the trace now.
// TODO(b/210460522): Determine why/where the event is being destroyed before
// eventProcessingComplete() is called.
std::visit(Visitor{[&](const TracedMotionEvent& e) { mTracer.mBackend->traceMotionEvent(e); },
[&](const TracedKeyEvent& e) { mTracer.mBackend->traceKeyEvent(e); }},
mState->event);
mState.reset();
}
} // namespace android::inputdispatcher::trace::impl
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