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/*
* Copyright (C) 2015, 2016, 2017, 2018, 2019 "IoT\.bzh"
* Author "Romain Forlot" <romain.forlot@iot.bzh>
* Author "Loïc Collignon" <loic.collignon@iot.bzh>
*
* 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 <utility>
#include <mutex>
#include <queue>
#include <thread>
#include <linux/can.h>
#include <condition_variable>
#include "openxc.pb.h"
#include "message/can-message.hpp"
#include "../binding/low-can-subscription.hpp"
#define CAN_ACTIVE_TIMEOUT_S 30
class diagnostic_manager_t;
/// @brief Object used to handle decoding and manage event queue to be pushed.
///
/// This object is also used to initialize can_bus_dev_t object after reading
/// json conf file describing the CAN devices to use. Thus, those object will read
/// on the device the CAN frame and push them into the can_bus_t can_message_q_ queue.
///
/// That queue will later be decoded and pushed to subscribers.
class can_bus_t
{
private:
bool apply_filter(const openxc_VehicleMessage& vehicle_message, std::shared_ptr<low_can_subscription_t> can_subscription);
void process_signals(std::shared_ptr<message_t> message, map_subscription& s);
void process_diagnostic_signals(diagnostic_manager_t& manager, std::shared_ptr<message_t> can_message, map_subscription& s);
void can_decode_message();
std::thread th_decoding_; ///< thread that will handle decoding a can frame
bool is_decoding_ = false; ///< boolean member controling thread while loop
void can_event_push();
std::thread th_pushing_; ///< thread that will handle pushing decoded can frame to subscribers
bool is_pushing_ = false; ///< boolean member controling thread while loop
std::condition_variable new_can_message_cv_; ///< condition_variable use to wait until there is a new CAN message to read
std::mutex can_message_mutex_; ///< mutex protecting the can_message_q_ queue.
std::queue <std::shared_ptr<message_t>> can_message_q_; ///< queue that will store can_message_t to be decoded
std::condition_variable new_decoded_can_message_; ///< condition_variable use to wait until there is a new vehicle message
/// to read from the queue vehicle_message_q_
std::mutex decoded_can_message_mutex_; ///< mutex protecting the vehicle_message_q_ queue.
std::queue <std::pair<int, openxc_VehicleMessage> > vehicle_message_q_; ///< queue that will store openxc_VehicleMessage to be pushed
std::vector<std::pair<std::string, std::string> > can_devices_mapping_; ///< can_devices_mapping_ - holds a mapping between logical CAN devices names and linux CAN devices names.
public:
explicit can_bus_t();
can_bus_t(can_bus_t&&);
~can_bus_t();
void set_can_devices(json_object *mapping);
void set_can_devices(const std::vector<std::pair<std::string, std::string> >& mapping);
int get_can_device_index(const std::string& bus_name) const;
const std::string get_can_device_name(const std::string& id_name) const;
void start_threads();
void stop_threads();
std::shared_ptr<message_t> next_can_message();
void push_new_can_message(std::shared_ptr<message_t> can_msg);
std::mutex& get_can_message_mutex();
std::condition_variable& get_new_can_message_cv();
std::pair<int, openxc_VehicleMessage> next_vehicle_message();
void push_new_vehicle_message(int subscription_id, const openxc_VehicleMessage& v_msg);
};
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