src/can-bus.cpp

   1 /*
   2  * Copyright (C) 2015, 2016 "IoT.bzh"
   3  * Author "Romain Forlot" <romain.forlot@iot.bzh>
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *       http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #include "can-bus.hpp"
  19
  20 #include <map>
  21 #include <cerrno>
  22 #include <vector>
  23 #include <string>
  24 #include <fcntl.h>
  25 #include <unistd.h>
  26 #include <net/if.h>
  27 #include <sys/ioctl.h>
  28 #include <sys/socket.h>
  29 #include <json-c/json.h>
  30 #include <linux/can/raw.h>
  31
  32 #include "can-decoder.hpp"
  33 #include "openxc-utils.hpp"
  34
  35 extern "C"
  36 {
  37         #include <afb/afb-binding.h>
  38 }
  39
  40 /********************************************************************************
  41 *
  42 *               can_bus_t method implementation
  43 *
  44 *********************************************************************************/
  45
  46 can_bus_t::can_bus_t(int conf_file)
  47         : conf_file_{conf_file}
  48 {
  49 }
  50
  51 void can_bus_t::can_decode_message()
  52 {
  53         can_message_t can_message;
  54         std::vector <CanSignal> signals;
  55         std::vector <CanSignal>::iterator signals_i;
  56         openxc_VehicleMessage vehicle_message;
  57         openxc_DynamicField search_key, decoded_message;
  58
  59         decoder_t decoder;
  60
  61         DEBUG(binder_interface, "Beginning of decoding thread.");
  62         while(is_decoding_)
  63         {
  64                 {
  65                         std::unique_lock<std::mutex> can_message_lock(can_message_mutex_);
  66                         new_can_message_.wait(can_message_lock);
  67                         can_message = next_can_message();
  68                 }
  69
  70                 /* First we have to found which CanSignal it is */
  71                 search_key = build_DynamicField((double)can_message.get_id());
  72                 signals = find_can_signals(search_key);
  73
  74                 /* Decoding the message ! Don't kill the messenger ! */
  75                 for(auto& sig : signals)
  76                 {
  77                         {
  78                                 std::lock_guard<std::mutex> subscribed_signals_lock(get_subscribed_signals_mutex());
  79                                 std::map<std::string, struct afb_event> subscribed_signals = get_subscribed_signals();
  80                                 const auto& it_event = subscribed_signals.find(sig.genericName);
  81
  82                                 if(it_event != subscribed_signals.end() && afb_event_is_valid(it_event->second))
  83                                 {
  84                                         decoded_message = decoder.translateSignal(sig, can_message, getSignals());
  85
  86                                         openxc_SimpleMessage s_message = build_SimpleMessage(sig.genericName, decoded_message);
  87                                         vehicle_message = build_VehicleMessage_with_SimpleMessage(openxc_DynamicField_Type::openxc_DynamicField_Type_NUM, s_message);
  88
  89                                         std::lock_guard<std::mutex> decoded_can_message_lock(decoded_can_message_mutex_);
  90                                         push_new_vehicle_message(vehicle_message);
  91                                 }
  92                                 new_decoded_can_message_.notify_one();
  93                         }
  94                 }
  95         }
  96 }
  97
  98 void can_bus_t::can_event_push()
  99 {
 100         openxc_VehicleMessage v_message;
 101         openxc_SimpleMessage s_message;
 102         json_object* jo;
 103
 104         DEBUG(binder_interface, "Beginning of the pushing thread");
 105         while(is_pushing_)
 106         {
 107                 {
 108                         std::unique_lock<std::mutex> decoded_can_message_lock(decoded_can_message_mutex_);
 109                         new_decoded_can_message_.wait(decoded_can_message_lock);
 110                         v_message = next_vehicle_message();
 111                 }
 112
 113                 s_message = get_simple_message(v_message);
 114
 115                 {
 116                         std::lock_guard<std::mutex> subscribed_signals_lock(get_subscribed_signals_mutex());
 117                         std::map<std::string, struct afb_event> subscribed_signals = get_subscribed_signals();
 118                         const auto& it_event = subscribed_signals.find(s_message.name);
 119                         if(it_event != subscribed_signals.end() && afb_event_is_valid(it_event->second))
 120                         {
 121                                 jo = json_object_new_object();
 122                                 jsonify_simple(s_message, jo);
 123                                 afb_event_push(it_event->second, jo);
 124                         }
 125                 }
 126         }
 127 }
 128
 129 void can_bus_t::start_threads()
 130 {
 131         is_decoding_ = true;
 132         th_decoding_ = std::thread(&can_bus_t::can_decode_message, this);
 133         if(!th_decoding_.joinable())
 134                 is_decoding_ = false;
 135
 136         is_pushing_ = true;
 137         th_pushing_ = std::thread(&can_bus_t::can_event_push, this);
 138         if(!th_pushing_.joinable())
 139                 is_pushing_ = false;
 140 }
 141
 142 void can_bus_t::stop_threads()
 143 {
 144         is_decoding_ = false;
 145         is_pushing_ = false;
 146         th_decoding_.join();
 147         th_pushing_.join();
 148 }
 149
 150 int can_bus_t::init_can_dev()
 151 {
 152         std::vector<std::string> devices_name;
 153         int i;
 154         size_t t;
 155
 156         devices_name = read_conf();
 157
 158         if (! devices_name.empty())
 159         {
 160                 t = devices_name.size();
 161                 i=0;
 162
 163                 for(const auto& device : devices_name)
 164                 {
 165                         can_devices_m_[device] = std::make_shared<can_bus_dev_t>(device);
 166                         if (can_devices_m_[device]->open() == 0)
 167                         {
 168                                 i++;
 169                                 DEBUG(binder_interface, "Start reading thread");
 170                                 can_devices_m_[device]->start_reading(*this);
 171                         }
 172                         else
 173                                 ERROR(binder_interface, "Can't open device %s", device.c_str());
 174                 }
 175
 176                 NOTICE(binder_interface, "Initialized %d/%d can bus device(s)", i, t);
 177                 return 0;
 178         }
 179         ERROR(binder_interface, "init_can_dev: Error at CAN device initialization. No devices read from configuration file. Did you specify canbus JSON object ?");
 180         return 1;
 181 }
 182
 183 std::vector<std::string> can_bus_t::read_conf()
 184 {
 185         std::vector<std::string> ret;
 186         json_object *jo, *canbus;
 187         int n, i;
 188         const char* taxi;
 189
 190         FILE *fd = fdopen(conf_file_, "r");
 191         if (fd)
 192         {
 193                 std::string fd_conf_content;
 194                 std::fseek(fd, 0, SEEK_END);
 195                 fd_conf_content.resize(std::ftell(fd));
 196                 std::rewind(fd);
 197                 std::fread(&fd_conf_content[0], 1, fd_conf_content.size(), fd);
 198                 std::fclose(fd);
 199
 200                 DEBUG(binder_interface, "Configuration file content : %s", fd_conf_content.c_str());
 201                 jo = json_tokener_parse(fd_conf_content.c_str());
 202
 203                 if (jo == NULL || !json_object_object_get_ex(jo, "canbus", &canbus))
 204                 {
 205                         ERROR(binder_interface, "Can't find canbus node in the configuration file. Please review it.");
 206                         ret.clear();
 207                 }
 208                 else if (json_object_get_type(canbus) != json_type_array)
 209                 {
 210                         taxi = json_object_get_string(canbus);
 211                         DEBUG(binder_interface, "Can bus found: %s", taxi);
 212                         ret.push_back(std::string(taxi));
 213                 }
 214                 else
 215                 {
 216                         n = json_object_array_length(canbus);
 217                         for (i = 0 ; i < n ; i++)
 218                                 ret.push_back(json_object_get_string(json_object_array_get_idx(canbus, i)));
 219                 }
 220                 return ret;
 221         }
 222         ERROR(binder_interface, "Problem at reading the conf file");
 223         ret.clear();
 224         return ret;
 225 }
 226
 227 std::condition_variable& can_bus_t::get_new_can_message()
 228 {
 229         return new_can_message_;
 230 }
 231
 232 std::mutex& can_bus_t::get_can_message_mutex()
 233 {
 234         return can_message_mutex_;
 235 }
 236
 237 can_message_t can_bus_t::next_can_message()
 238 {
 239         can_message_t can_msg;
 240
 241         if(!can_message_q_.empty())
 242         {
 243                 can_msg = can_message_q_.front();
 244                 can_message_q_.pop();
 245                 DEBUG(binder_interface, "next_can_message: Here is the next can message : id %d, length %d", can_msg.get_id(), can_msg.get_length());
 246                 return can_msg;
 247         }
 248
 249         NOTICE(binder_interface, "next_can_message: End of can message queue");
 250         has_can_message_ = false;
 251         return can_msg;
 252 }
 253
 254 void can_bus_t::push_new_can_message(const can_message_t& can_msg)
 255 {
 256         can_message_q_.push(can_msg);
 257 }
 258
 259 openxc_VehicleMessage can_bus_t::next_vehicle_message()
 260 {
 261         openxc_VehicleMessage v_msg;
 262
 263         if(! vehicle_message_q_.empty())
 264         {
 265                 v_msg = vehicle_message_q_.front();
 266                 vehicle_message_q_.pop();
 267                 DEBUG(binder_interface, "next_vehicle_message: next vehicle message poped");
 268                 return v_msg;
 269         }
 270
 271         NOTICE(binder_interface, "next_vehicle_message: End of vehicle message queue");
 272         has_vehicle_message_ = false;
 273         return v_msg;
 274 }
 275
 276 void can_bus_t::push_new_vehicle_message(const openxc_VehicleMessage& v_msg)
 277 {
 278         vehicle_message_q_.push(v_msg);
 279         has_vehicle_message_ = true;
 280 }
 281
 282 std::map<std::string, std::shared_ptr<can_bus_dev_t>> can_bus_t::get_can_devices()
 283 {
 284         return can_devices_m_;
 285 }
 286
 287 /********************************************************************************
 288 *
 289 *               can_bus_dev_t method implementation
 290 *
 291 *********************************************************************************/
 292
 293 can_bus_dev_t::can_bus_dev_t(const std::string &dev_name)
 294         : device_name_{dev_name}, can_socket_{-1}
 295 {
 296 }
 297
 298 int can_bus_dev_t::open()
 299 {
 300         const int canfd_on = 1;
 301         const int timestamp_on = 1;
 302         struct ifreq ifr;
 303         struct timeval timeout;
 304
 305         DEBUG(binder_interface, "CAN Handler socket : %d", can_socket_);
 306         if (can_socket_ >= 0)
 307                 return 0;
 308
 309         can_socket_ = ::socket(PF_CAN, SOCK_RAW, CAN_RAW);
 310         DEBUG(binder_interface, "CAN Handler socket correctly initialized : %d", can_socket_);
 311         if (can_socket_ < 0)
 312                 ERROR(binder_interface, "socket could not be created. Error was : %s", ::strerror(errno));
 313         else
 314         {
 315                 /* Set timeout for read */
 316                 ::setsockopt(can_socket_, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout, sizeof(timeout));
 317                 /* Set timestamp for receveid frame */
 318                 if (::setsockopt(can_socket_, SOL_SOCKET, SO_TIMESTAMP, &timestamp_on, sizeof(timestamp_on)) < 0)
 319                         WARNING(binder_interface, "setsockopt SO_TIMESTAMP error: %s", ::strerror(errno));
 320                 DEBUG(binder_interface, "Switch CAN Handler socket to use fd mode");
 321                 /* try to switch the socket into CAN_FD mode */
 322                 if (::setsockopt(can_socket_, SOL_CAN_RAW, CAN_RAW_FD_FRAMES, &canfd_on, sizeof(canfd_on)) < 0)
 323                 {
 324                         NOTICE(binder_interface, "Can not switch into CAN Extended frame format.");
 325                         is_fdmode_on_ = false;
 326                 } else {
 327                         DEBUG(binder_interface, "Correctly set up CAN socket to use FD frames.");
 328                         is_fdmode_on_ = true;
 329                 }
 330
 331                 /* Attempts to open a socket to CAN bus */
 332                 ::strcpy(ifr.ifr_name, device_name_.c_str());
 333                 DEBUG(binder_interface, "ifr_name is : %s", ifr.ifr_name);
 334                 if(::ioctl(can_socket_, SIOCGIFINDEX, &ifr) < 0)
 335                         ERROR(binder_interface, "ioctl failed. Error was : %s", strerror(errno));
 336                 else
 337                 {
 338                         txAddress_.can_family = AF_CAN;
 339                         txAddress_.can_ifindex = ifr.ifr_ifindex;
 340
 341                         /* And bind it to txAddress */
 342                         DEBUG(binder_interface, "Bind the socket");
 343                         if (::bind(can_socket_, (struct sockaddr *)&txAddress_, sizeof(txAddress_)) < 0)
 344                                 ERROR(binder_interface, "Bind failed. %s", strerror(errno));
 345                         else
 346                                 return 0;
 347                 }
 348                 close();
 349         }
 350         return -1;
 351 }
 352
 353 int can_bus_dev_t::close()
 354 {
 355         ::close(can_socket_);
 356         can_socket_ = -1;
 357         return can_socket_;
 358 }
 359
 360 canfd_frame can_bus_dev_t::read()
 361 {
 362         ssize_t nbytes;
 363         //int maxdlen;
 364         canfd_frame canfd_frame;
 365
 366         /* Test that socket is really opened */
 367         if (can_socket_ < 0)
 368         {
 369                 ERROR(binder_interface, "read_can: Socket unavailable. Closing thread.");
 370                 is_running_ = false;
 371         }
 372
 373         nbytes = ::read(can_socket_, &canfd_frame, CANFD_MTU);
 374
 375         /* if we did not fit into CAN sized messages then stop_reading. */
 376         if (nbytes != CANFD_MTU && nbytes != CAN_MTU)
 377                 if (errno == ENETDOWN)
 378                         ERROR(binder_interface, "read: %s CAN device down", device_name_);
 379                 ERROR(binder_interface, "read: Error reading CAN bus");
 380                 ::memset(&canfd_frame, 0, sizeof(canfd_frame));
 381                 stop_reading();
 382
 383         return canfd_frame;
 384 }
 385
 386 void can_bus_dev_t::start_reading(can_bus_t& can_bus)
 387 {
 388         DEBUG(binder_interface, "Launching reading thread");
 389         is_running_ = true;
 390         th_reading_ = std::thread(&can_bus_dev_t::can_reader, this, std::ref(can_bus));
 391         if(!th_reading_.joinable())
 392                 is_running_ = false;
 393 }
 394
 395 void can_bus_dev_t::stop_reading()
 396 {
 397         is_running_ = false;
 398         th_reading_.join();
 399 }
 400
 401 void can_bus_dev_t::can_reader(can_bus_t& can_bus)
 402 {
 403         can_message_t can_message;
 404
 405         DEBUG(binder_interface, "Beginning of reading thread");
 406         while(is_running_)
 407         {
 408                 can_message.convert_from_canfd_frame(read());
 409
 410                 {
 411                         std::lock_guard<std::mutex> can_message_lock(can_bus.get_can_message_mutex());
 412                         can_bus.push_new_can_message(can_message);
 413                 }
 414                 can_bus.get_new_can_message().notify_one();
 415         }
 416 }
 417
 418 int can_bus_dev_t::send_can_message(can_message_t& can_msg)
 419 {
 420         ssize_t nbytes;
 421         canfd_frame f;
 422
 423         f = can_msg.convert_to_canfd_frame();
 424
 425         if(can_socket_ >= 0)
 426         {
 427                 nbytes = ::sendto(can_socket_, &f, sizeof(struct canfd_frame), 0,
 428                                 (struct sockaddr*)&txAddress_, sizeof(txAddress_));
 429                 if (nbytes == -1)
 430                 {
 431                         ERROR(binder_interface, "send_can_message: Sending CAN frame failed.");
 432                         return -1;
 433                 }
 434                 return (int)nbytes;
 435         }
 436         else
 437         {
 438                 ERROR(binder_interface, "send_can_message: socket not initialized. Attempt to reopen can device socket.");
 439                 open();
 440         }
 441         return 0;
 442 }