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/*
* Copyright (C) 2019 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 <health2impl/BinderHealth.h>
#include <android-base/logging.h>
#include <hidl/HidlTransportSupport.h>
#include <hwbinder/IPCThreadState.h>
#include <health2impl/Callback.h>
#include <health2impl/Health.h>
using android::hardware::handleTransportPoll;
using android::hardware::IPCThreadState;
using android::hardware::setupTransportPolling;
using android::hardware::health::V2_0::Result;
namespace android {
namespace hardware {
namespace health {
namespace V2_1 {
namespace implementation {
bool IsDeadObject(const Return<void>& ret) {
if (ret.isOk()) return false;
if (ret.isDeadObject()) return true;
return false;
}
BinderHealth::BinderHealth(const std::string& name, const sp<IHealth>& impl)
: HalHealthLoop(name, impl) {
CHECK_NE(this, impl.get());
CHECK(!impl->isRemote());
}
//
// Methods that handle callbacks.
//
Return<Result> BinderHealth::registerCallback(const sp<V2_0::IHealthInfoCallback>& callback) {
if (callback == nullptr) {
return Result::SUCCESS;
}
Callback* wrapped = nullptr;
{
std::lock_guard<decltype(callbacks_lock_)> lock(callbacks_lock_);
wrapped = callbacks_.emplace_back(Wrap(callback)).get();
// unlock
}
auto linkRet = callback->linkToDeath(this, 0u /* cookie */);
if (!linkRet.withDefault(false)) {
LOG(WARNING) << __func__ << "Cannot link to death: "
<< (linkRet.isOk() ? "linkToDeath returns false" : linkRet.description());
// ignore the error
}
getHealthInfo_2_1([&](auto res, const auto& health_info) {
if (res != Result::SUCCESS) {
LOG(ERROR) << "Cannot call getHealthInfo_2_1: " << toString(res);
return;
}
auto ret = wrapped->Notify(health_info);
if (IsDeadObject(ret)) {
// Remove callback reference.
std::lock_guard<decltype(callbacks_lock_)> lock(callbacks_lock_);
auto it = std::find_if(callbacks_.begin(), callbacks_.end(),
[wrapped](const auto& cb) { return cb.get() == wrapped; });
if (it != callbacks_.end()) {
callbacks_.erase(it);
}
// unlock
}
});
return Result::SUCCESS;
}
bool BinderHealth::unregisterCallbackInternal(const sp<IBase>& callback) {
if (callback == nullptr) {
return false;
}
bool removed = false;
std::lock_guard<decltype(callbacks_lock_)> lock(callbacks_lock_);
for (auto it = callbacks_.begin(); it != callbacks_.end();) {
if (interfacesEqual((*it)->Get(), callback)) {
it = callbacks_.erase(it);
removed = true;
} else {
++it;
}
}
(void)callback->unlinkToDeath(this).isOk(); // ignore errors
return removed;
}
Return<Result> BinderHealth::update() {
Result result = service()->update();
if (result != Result::SUCCESS) return result;
getHealthInfo_2_1([&](auto res, const auto& health_info) {
if (res != Result::SUCCESS) {
result = res;
return;
}
OnHealthInfoChanged(health_info);
});
return result;
}
Return<Result> BinderHealth::unregisterCallback(const sp<V2_0::IHealthInfoCallback>& callback) {
return unregisterCallbackInternal(callback) ? Result::SUCCESS : Result::NOT_FOUND;
}
void BinderHealth::OnHealthInfoChanged(const HealthInfo& health_info) {
// Notify all callbacks
std::unique_lock<decltype(callbacks_lock_)> lock(callbacks_lock_);
for (auto it = callbacks_.begin(); it != callbacks_.end();) {
auto ret = (*it)->Notify(health_info);
if (IsDeadObject(ret)) {
it = callbacks_.erase(it);
} else {
++it;
}
}
lock.unlock();
// adjusts uevent / wakealarm periods
HalHealthLoop::OnHealthInfoChanged(health_info);
}
void BinderHealth::serviceDied(uint64_t /* cookie */, const wp<IBase>& who) {
(void)unregisterCallbackInternal(who.promote());
}
void BinderHealth::BinderEvent(uint32_t /*epevents*/) {
if (binder_fd_ >= 0) {
handleTransportPoll(binder_fd_);
}
}
void BinderHealth::Init(struct healthd_config* config) {
// Set up epoll and get uevent / wake alarm periods
HalHealthLoop::Init(config);
LOG(INFO) << instance_name() << " instance initializing with healthd_config...";
binder_fd_ = setupTransportPolling();
if (binder_fd_ >= 0) {
auto binder_event = [](auto* health_loop, uint32_t epevents) {
static_cast<BinderHealth*>(health_loop)->BinderEvent(epevents);
};
if (RegisterEvent(binder_fd_, binder_event, EVENT_NO_WAKEUP_FD) != 0) {
PLOG(ERROR) << instance_name() << " instance: Register for binder events failed";
}
}
CHECK_EQ(registerAsService(instance_name()), android::OK)
<< instance_name() << ": Failed to register HAL";
LOG(INFO) << instance_name() << ": Hal init done";
}
int BinderHealth::PrepareToWait(void) {
IPCThreadState::self()->flushCommands();
return HalHealthLoop::PrepareToWait();
}
} // namespace implementation
} // namespace V2_1
} // namespace health
} // namespace hardware
} // namespace android
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