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-rw-r--r--low-can-binding/can/can-bus.cpp398
1 files changed, 0 insertions, 398 deletions
diff --git a/low-can-binding/can/can-bus.cpp b/low-can-binding/can/can-bus.cpp
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--- a/low-can-binding/can/can-bus.cpp
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-/*
- * Copyright (C) 2015, 2016 "IoT.bzh"
- * Author "Romain Forlot" <romain.forlot@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.
- */
-
-#include <map>
-#include <cerrno>
-#include <vector>
-#include <string>
-#include <fcntl.h>
-#include <unistd.h>
-#include <net/if.h>
-#include <sys/ioctl.h>
-#include <sys/socket.h>
-#include <json-c/json.h>
-#include <linux/can/raw.h>
-
-#include "can-bus.hpp"
-
-#include "can-signals.hpp"
-#include "can-decoder.hpp"
-#include "../configuration.hpp"
-#include "../utils/signals.hpp"
-#include "../utils/openxc-utils.hpp"
-
-extern "C"
-{
- #include <afb/afb-binding.h>
-}
-
-/// @brief Class constructor
-///
-/// @param[in] conf_file - handle to the json configuration file.
-can_bus_t::can_bus_t(int conf_file)
- : conf_file_{conf_file}
-{
-}
-
-std::map<std::string, std::shared_ptr<can_bus_dev_t>> can_bus_t::can_devices_;
-
-/// @brief Will make the decoding operation on a classic CAN message. It will not
-/// handle CAN commands nor diagnostic messages that have their own method to get
-/// this happens.
-///
-/// It will add to the vehicle_message queue the decoded message and tell the event push
-/// thread to process it.
-///
-/// @param[in] can_message - a single CAN message from the CAN socket read, to be decode.
-///
-/// @return How many signals has been decoded.
-int can_bus_t::process_can_signals(can_message_t& can_message)
-{
- int processed_signals = 0;
- std::vector <can_signal_t*> signals;
- openxc_DynamicField search_key, decoded_message;
- openxc_VehicleMessage vehicle_message;
-
- // First we have to found which can_signal_t it is
- search_key = build_DynamicField((double)can_message.get_id());
- configuration_t::instance().find_can_signals(search_key, signals);
-
- // Decoding the message ! Don't kill the messenger !
- for(auto& sig : signals)
- {
- std::lock_guard<std::mutex> subscribed_signals_lock(get_subscribed_signals_mutex());
- std::map<std::string, struct afb_event>& s = get_subscribed_signals();
-
- // DEBUG message to make easier debugger STL containers...
- //DEBUG(binder_interface, "Operator[] key char: %s, event valid? %d", sig.generic_name, afb_event_is_valid(s[sig.generic_name]));
- //DEBUG(binder_interface, "Operator[] key string: %s, event valid? %d", sig.generic_name, afb_event_is_valid(s[std::string(sig.generic_name)]));
- //DEBUG(binder_interface, "Nb elt matched char: %d", (int)s.count(sig.generic_name));
- //DEBUG(binder_interface, "Nb elt matched string: %d", (int)s.count(std::string(sig.generic_name));
- if( s.find(sig->get_name()) != s.end() && afb_event_is_valid(s[sig->get_name()]))
- {
- decoded_message = decoder_t::translateSignal(*sig, can_message, configuration_t::instance().get_can_signals());
-
- openxc_SimpleMessage s_message = build_SimpleMessage(sig->get_name(), decoded_message);
- vehicle_message = build_VehicleMessage(s_message);
-
- std::lock_guard<std::mutex> decoded_can_message_lock(decoded_can_message_mutex_);
- push_new_vehicle_message(vehicle_message);
- processed_signals++;
- }
- }
-
- DEBUG(binder_interface, "process_can_signals: %d/%d CAN signals processed.", processed_signals, (int)signals.size());
- return processed_signals;
-}
-
-/// @brief Will make the decoding operation on a diagnostic CAN message.Then it find the subscribed signal
-/// corresponding and will add the vehicle_message to the queue of event to pushed before notifying
-/// the event push thread to process it.
-///
-/// @param[in] manager - the diagnostic manager object that handle diagnostic communication
-/// @param[in] can_message - a single CAN message from the CAN socket read, to be decode.
-///
-/// @return How many signals has been decoded.
-int can_bus_t::process_diagnostic_signals(diagnostic_manager_t& manager, const can_message_t& can_message)
-{
- int processed_signals = 0;
-
- std::lock_guard<std::mutex> subscribed_signals_lock(get_subscribed_signals_mutex());
- std::map<std::string, struct afb_event>& s = get_subscribed_signals();
-
- openxc_VehicleMessage vehicle_message = manager.find_and_decode_adr(can_message);
- if( (vehicle_message.has_simple_message && vehicle_message.simple_message.has_name) &&
- (s.find(vehicle_message.simple_message.name) != s.end() && afb_event_is_valid(s[vehicle_message.simple_message.name])))
- {
- std::lock_guard<std::mutex> decoded_can_message_lock(decoded_can_message_mutex_);
- push_new_vehicle_message(vehicle_message);
- processed_signals++;
- }
-
- return processed_signals;
-}
-
-/// @brief thread to decoding raw CAN messages.
-///
-/// Depending on the nature of message, if arbitration ID matches ID for a diagnostic response
-/// then decoding a diagnostic message else use classic CAN signals decoding functions.
-///
-/// It will take from the can_message_q_ queue the next can message to process then it search
-/// about signal subscribed if there is a valid afb_event for it. We only decode signal for which a
-/// subscription has been made. Can message will be decoded using translateSignal that will pass it to the
-/// corresponding decoding function if there is one assigned for that signal. If not, it will be the default
-/// noopDecoder function that will operate on it.
-///
-/// TODO: make diagnostic messages parsing optionnal.
-void can_bus_t::can_decode_message()
-{
- can_message_t can_message;
-
- while(is_decoding_)
- {
- {
- std::unique_lock<std::mutex> can_message_lock(can_message_mutex_);
- new_can_message_cv_.wait(can_message_lock);
- while(!can_message_q_.empty())
- {
- can_message = next_can_message();
-
- if(configuration_t::instance().get_diagnostic_manager().is_diagnostic_response(can_message))
- process_diagnostic_signals(configuration_t::instance().get_diagnostic_manager(), can_message);
- else
- process_can_signals(can_message);
- }
- }
- new_decoded_can_message_.notify_one();
- }
-}
-
-/// @brief thread to push events to suscribers. It will read subscribed_signals map to look
-/// which are events that has to be pushed.
-void can_bus_t::can_event_push()
-{
- openxc_VehicleMessage v_message;
- openxc_SimpleMessage s_message;
- json_object* jo;
-
- while(is_pushing_)
- {
- std::unique_lock<std::mutex> decoded_can_message_lock(decoded_can_message_mutex_);
- new_decoded_can_message_.wait(decoded_can_message_lock);
- while(!vehicle_message_q_.empty())
- {
- v_message = next_vehicle_message();
-
- s_message = get_simple_message(v_message);
- {
- std::lock_guard<std::mutex> subscribed_signals_lock(get_subscribed_signals_mutex());
- std::map<std::string, struct afb_event>& s = get_subscribed_signals();
- if(s.find(std::string(s_message.name)) != s.end() && afb_event_is_valid(s[std::string(s_message.name)]))
- {
- jo = json_object_new_object();
- jsonify_simple(s_message, jo);
- if(afb_event_push(s[std::string(s_message.name)], jo) == 0)
- on_no_clients(std::string(s_message.name));
- }
- }
- }
- }
-}
-
-/// @brief Will initialize threads that will decode
-/// and push subscribed events.
-void can_bus_t::start_threads()
-{
- is_decoding_ = true;
- th_decoding_ = std::thread(&can_bus_t::can_decode_message, this);
- if(!th_decoding_.joinable())
- is_decoding_ = false;
-
- is_pushing_ = true;
- th_pushing_ = std::thread(&can_bus_t::can_event_push, this);
- if(!th_pushing_.joinable())
- is_pushing_ = false;
-}
-
-/// @brief Will stop all threads holded by can_bus_t object
-/// which are decoding and pushing then will wait that's
-/// they'll finish their job.
-void can_bus_t::stop_threads()
-{
- is_decoding_ = false;
- is_pushing_ = false;
-}
-
-/// @brief Will initialize can_bus_dev_t objects after reading
-/// the configuration file passed in the constructor. All CAN buses
-/// Initialized here will be added to a vector holding them for
-/// inventory and later access.
-///
-/// That will initialize CAN socket reading too using a new thread.
-///
-/// @return 0 if ok, other if not.
-int can_bus_t::init_can_dev()
-{
- std::vector<std::string> devices_name;
- int i = 0;
- size_t t;
-
- devices_name = read_conf();
-
- if (! devices_name.empty())
- {
- t = devices_name.size();
-
- for(const auto& device : devices_name)
- {
- can_bus_t::can_devices_[device] = std::make_shared<can_bus_dev_t>(device, i);
- if (can_bus_t::can_devices_[device]->open() == 0)
- {
- DEBUG(binder_interface, "Start reading thread");
- NOTICE(binder_interface, "%s device opened and reading", device.c_str());
- can_bus_t::can_devices_[device]->start_reading(*this);
- i++;
- }
- else
- {
- ERROR(binder_interface, "Can't open device %s", device.c_str());
- return 1;
- }
- }
-
- NOTICE(binder_interface, "Initialized %d/%d can bus device(s)", i, (int)t);
- return 0;
- }
- ERROR(binder_interface, "init_can_dev: Error at CAN device initialization. No devices read from configuration file. Did you specify canbus JSON object ?");
- return 1;
-}
-
-/// @brief read the conf_file_ and will parse json objects
-/// in it searching for canbus objects devices name.
-///
-/// @return Vector of can bus device name string.
-std::vector<std::string> can_bus_t::read_conf()
-{
- std::vector<std::string> ret;
- json_object *jo, *canbus;
- int n, i;
- const char* taxi;
-
- FILE *fd = fdopen(conf_file_, "r");
- if (fd)
- {
- std::string fd_conf_content;
- std::fseek(fd, 0, SEEK_END);
- fd_conf_content.resize(std::ftell(fd));
- std::rewind(fd);
- std::fread(&fd_conf_content[0], 1, fd_conf_content.size(), fd);
- std::fclose(fd);
-
- DEBUG(binder_interface, "Configuration file content : %s", fd_conf_content.c_str());
- jo = json_tokener_parse(fd_conf_content.c_str());
-
- if (jo == NULL || !json_object_object_get_ex(jo, "canbus", &canbus))
- {
- ERROR(binder_interface, "Can't find canbus node in the configuration file. Please review it.");
- ret.clear();
- }
- else if (json_object_get_type(canbus) != json_type_array)
- {
- taxi = json_object_get_string(canbus);
- DEBUG(binder_interface, "Can bus found: %s", taxi);
- ret.push_back(std::string(taxi));
- }
- else
- {
- n = json_object_array_length(canbus);
- for (i = 0 ; i < n ; i++)
- ret.push_back(json_object_get_string(json_object_array_get_idx(canbus, i)));
- }
- return ret;
- }
- ERROR(binder_interface, "Problem at reading the conf file");
- ret.clear();
- return ret;
-}
-
-/// @brief return new_can_message_cv_ member
-///
-/// @return return new_can_message_cv_ member
-std::condition_variable& can_bus_t::get_new_can_message_cv()
-{
- return new_can_message_cv_;
-}
-
-/// @brief return can_message_mutex_ member
-///
-/// @return return can_message_mutex_ member
-std::mutex& can_bus_t::get_can_message_mutex()
-{
- return can_message_mutex_;
-}
-
-/// @brief Return first can_message_t on the queue
-///
-/// @return a can_message_t
-can_message_t can_bus_t::next_can_message()
-{
- can_message_t can_msg;
-
- if(!can_message_q_.empty())
- {
- can_msg = can_message_q_.front();
- can_message_q_.pop();
- DEBUG(binder_interface, "next_can_message: Here is the next can message : id %X, length %X, data %02X%02X%02X%02X%02X%02X%02X%02X", can_msg.get_id(), can_msg.get_length(),
- can_msg.get_data()[0], can_msg.get_data()[1], can_msg.get_data()[2], can_msg.get_data()[3], can_msg.get_data()[4], can_msg.get_data()[5], can_msg.get_data()[6], can_msg.get_data()[7]);
- return can_msg;
- }
-
- return can_msg;
-}
-
-/// @brief Push a can_message_t into the queue
-///
-/// @param[in] can_msg - the const reference can_message_t object to push into the queue
-void can_bus_t::push_new_can_message(const can_message_t& can_msg)
-{
- can_message_q_.push(can_msg);
-}
-
-/// @brief Return first openxc_VehicleMessage on the queue
-///
-/// @return a openxc_VehicleMessage containing a decoded can message
-openxc_VehicleMessage can_bus_t::next_vehicle_message()
-{
- openxc_VehicleMessage v_msg;
-
- if(! vehicle_message_q_.empty())
- {
- v_msg = vehicle_message_q_.front();
- vehicle_message_q_.pop();
- DEBUG(binder_interface, "next_vehicle_message: next vehicle message poped");
- return v_msg;
- }
-
- return v_msg;
-}
-
-/// @brief Push a openxc_VehicleMessage into the queue
-///
-/// @param[in] v_msg - const reference openxc_VehicleMessage object to push into the queue
-void can_bus_t::push_new_vehicle_message(const openxc_VehicleMessage& v_msg)
-{
- vehicle_message_q_.push(v_msg);
-}
-
-/// @brief Return a map with the can_bus_dev_t initialized
-///
-/// @return map can_bus_dev_m_ map
-const std::map<std::string, std::shared_ptr<can_bus_dev_t>>& can_bus_t::get_can_devices() const
-{
- return can_bus_t::can_devices_;
-}
-
-/// @brief Return the shared pointer on the can_bus_dev_t initialized
-/// with device_name "bus"
-///
-/// @param[in] bus - CAN bus device name to retrieve.
-///
-/// @return A shared pointer on an object can_bus_dev_t
-std::shared_ptr<can_bus_dev_t> can_bus_t::get_can_device(std::string bus)
-{
- return can_bus_t::can_devices_[bus];
-}