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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.
*/
#pragma once
#include <atomic>
#include <memory>
#include <mutex>
#include <thread>
#include <map>
#include <json/json.h>
#include "common/libs/fs/shared_fd.h"
namespace cuttlefish {
// Listen to kernel log events and report them to clients.
struct KernelLogEventsHandler {
explicit KernelLogEventsHandler(SharedFD kernel_log_fd);
~KernelLogEventsHandler();
int AddSubscriber(std::function<void(const Json::Value&)> subscriber);
void Unsubscribe(int subscriber_id);
private:
void ReadLoop();
void DeliverEvent(const Json::Value& event);
SharedFD kernel_log_fd_;
SharedFD eventfd_;
std::atomic<bool> running_;
std::thread read_thread_;
std::map<int, std::function<void(const Json::Value&)>> subscribers_;
int last_subscriber_id_ = 0;
std::mutex subscribers_mtx_;
};
} // namespace cuttlefish
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