low-can-binding/binding/low-can-cb.cpp

   1 /*
   2  * Copyright (C) 2015, 2018 "IoT.bzh"
   3  * Author "Romain Forlot" <romain.forlot@iot.bzh>
   4  * Author "Loic Collignon" <loic.collignon@iot.bzh>
   5  *
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  *       http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  */
  18
  19 #include "low-can-hat.hpp"
  20 #include "low-can-apidef.h"
  21
  22 #include <map>
  23 #include <queue>
  24 #include <mutex>
  25 #include <vector>
  26 #include <thread>
  27 #include <wrap-json.h>
  28 #include <systemd/sd-event.h>
  29
  30 #include "openxc.pb.h"
  31 #include "application.hpp"
  32 #include "../can/can-encoder.hpp"
  33 #include "../can/can-bus.hpp"
  34 #include "../can/signals.hpp"
  35 #include "../can/message/message.hpp"
  36 #include "../utils/signals.hpp"
  37 #include "../diagnostic/diagnostic-message.hpp"
  38 #include "../utils/openxc-utils.hpp"
  39
  40 ///******************************************************************************
  41 ///
  42 ///             SystemD event loop Callbacks
  43 ///
  44 ///*******************************************************************************/
  45
  46 void on_no_clients(std::shared_ptr<low_can_subscription_t> can_subscription, uint32_t pid, std::map<int, std::shared_ptr<low_can_subscription_t> >& s)
  47 {
  48         bool is_permanent_recurring_request = false;
  49
  50         if( ! can_subscription->get_diagnostic_message().empty() && can_subscription->get_diagnostic_message(pid) != nullptr)
  51         {
  52                 DiagnosticRequest diag_req = can_subscription->get_diagnostic_message(pid)->build_diagnostic_request();
  53                 active_diagnostic_request_t* adr = application_t::instance().get_diagnostic_manager().find_recurring_request(diag_req);
  54                 if( adr != nullptr)
  55                 {
  56                         is_permanent_recurring_request = adr->get_permanent();
  57
  58                         if(! is_permanent_recurring_request)
  59                                 application_t::instance().get_diagnostic_manager().cleanup_request(adr, true);
  60                 }
  61         }
  62
  63         if(! is_permanent_recurring_request)
  64                 on_no_clients(can_subscription, s);
  65 }
  66
  67 void on_no_clients(std::shared_ptr<low_can_subscription_t> can_subscription, std::map<int, std::shared_ptr<low_can_subscription_t> >& s)
  68 {
  69         auto it = s.find(can_subscription->get_index());
  70         s.erase(it);
  71 }
  72
  73 static void push_n_notify(std::shared_ptr<message_t> m)
  74 {
  75         can_bus_t& cbm = application_t::instance().get_can_bus_manager();
  76         {
  77                 std::lock_guard<std::mutex> can_message_lock(cbm.get_can_message_mutex());
  78                 cbm.push_new_can_message(m);
  79         }
  80         cbm.get_new_can_message_cv().notify_one();
  81 }
  82
  83 int read_message(sd_event_source *event_source, int fd, uint32_t revents, void *userdata)
  84 {
  85         low_can_subscription_t* can_subscription = (low_can_subscription_t*)userdata;
  86
  87
  88         if ((revents & EPOLLIN) != 0)
  89         {
  90                 std::shared_ptr<utils::socketcan_t> s = can_subscription->get_socket();
  91                 std::shared_ptr<message_t> message = s->read_message();
  92
  93                 // Sure we got a valid CAN message ?
  94                 if (! message->get_id() == 0 && ! message->get_length() == 0)
  95                 {
  96                         push_n_notify(message);
  97                 }
  98         }
  99
 100         // check if error or hangup
 101         if ((revents & (EPOLLERR|EPOLLRDHUP|EPOLLHUP)) != 0)
 102         {
 103                 sd_event_source_unref(event_source);
 104                 can_subscription->get_socket()->close();
 105         }
 106
 107         return 0;
 108 }
 109
 110 ///******************************************************************************
 111 ///
 112 ///             Subscription and unsubscription
 113 ///
 114 ///*******************************************************************************/
 115
 116 /// @brief This will determine if an event handle needs to be created and checks if
 117 /// we got a valid afb_event to get subscribe or unsubscribe. After that launch the subscription or unsubscription
 118 /// against the application framework using that event handle.
 119 static int subscribe_unsubscribe_signal(afb_req_t request,
 120                                         bool subscribe,
 121                                         std::shared_ptr<low_can_subscription_t>& can_subscription,
 122                                         std::map<int, std::shared_ptr<low_can_subscription_t> >& s)
 123 {
 124         int ret = 0;
 125         int sub_index = can_subscription->get_index();
 126         bool subscription_exists = s.count(sub_index);
 127
 128         // Susbcription part
 129         if(subscribe)
 130         {
 131                 /* There is no valid request to subscribe so this must be an
 132                  * internal permanent diagnostic request. Skip the subscription
 133                  * part and don't register it into the current "low-can"
 134                  * subsciptions.
 135                  */
 136                 if(! request)
 137                 {
 138                         return 0;
 139                 }
 140
 141                 // Event doesn't exist , so let's create it
 142                 if (! subscription_exists &&
 143                     (ret = can_subscription->subscribe(request)) < 0)
 144                         return ret;
 145
 146                 if(! subscription_exists)
 147                                 s[sub_index] = can_subscription;
 148
 149                 return ret;
 150         }
 151
 152         // Unsubscrition part
 153         if(! subscription_exists)
 154         {
 155                 AFB_NOTICE("There isn't any valid subscriptions for that request.");
 156                 return ret;
 157         }
 158         else if (subscription_exists &&
 159                  ! afb_event_is_valid(s[sub_index]->get_event()) )
 160         {
 161                 AFB_NOTICE("Event isn't valid, no need to unsubscribed.");
 162                 return ret;
 163         }
 164
 165         if( (ret = s[sub_index]->unsubscribe(request)) < 0)
 166                 return ret;
 167         s.erase(sub_index);
 168
 169         return ret;
 170 }
 171
 172 static int add_to_event_loop(std::shared_ptr<low_can_subscription_t>& can_subscription)
 173 {
 174                 struct sd_event_source* event_source = nullptr;
 175                 return ( sd_event_add_io(afb_daemon_get_event_loop(),
 176                         &event_source,
 177                         can_subscription->get_socket()->socket(),
 178                         EPOLLIN,
 179                         read_message,
 180                         can_subscription.get()));
 181 }
 182
 183 static int subscribe_unsubscribe_diagnostic_messages(afb_req_t request,
 184                                                      bool subscribe,
 185                                                      std::vector<std::shared_ptr<diagnostic_message_t> > diagnostic_messages,
 186                                                      struct event_filter_t& event_filter,
 187                                                      std::map<int, std::shared_ptr<low_can_subscription_t> >& s,
 188                                                      bool perm_rec_diag_req)
 189 {
 190         int rets = 0;
 191         application_t& app = application_t::instance();
 192         diagnostic_manager_t& diag_m = app.get_diagnostic_manager();
 193
 194         for(const auto& sig : diagnostic_messages)
 195         {
 196                 DiagnosticRequest* diag_req = new DiagnosticRequest(sig->build_diagnostic_request());
 197                 event_filter.frequency = event_filter.frequency == 0 ? sig->get_frequency() : event_filter.frequency;
 198                 std::shared_ptr<low_can_subscription_t> can_subscription;
 199
 200                 auto it =  std::find_if(s.begin(), s.end(), [&sig](std::pair<int, std::shared_ptr<low_can_subscription_t> > sub){ return (! sub.second->get_diagnostic_message().empty());});
 201                 can_subscription = it != s.end() ?
 202                         it->second :
 203                         std::make_shared<low_can_subscription_t>(low_can_subscription_t(event_filter));
 204                 // If the requested diagnostic message is not supported by the car then unsubcribe it
 205                 // no matter what we want, worst case will be a failed unsubscription but at least we won't
 206                 // poll a PID for nothing.
 207                 if(sig->get_supported() && subscribe)
 208                 {
 209                         if (!app.isEngineOn())
 210                                 AFB_WARNING("signal: Engine is off, %s won't received responses until it's on",  sig->get_name().c_str());
 211
 212                         diag_m.add_recurring_request(diag_req, sig->get_name().c_str(), false, sig->get_decoder(), sig->get_callback(), event_filter.frequency, perm_rec_diag_req);
 213                         if(can_subscription->create_rx_filter(sig) < 0)
 214                                 {return -1;}
 215                         AFB_DEBUG("Signal: %s subscribed", sig->get_name().c_str());
 216                         if(it == s.end() && add_to_event_loop(can_subscription) < 0)
 217                         {
 218                                 diag_m.cleanup_request(
 219                                         diag_m.find_recurring_request(*diag_req), true);
 220                                 AFB_WARNING("signal: %s isn't supported. Canceling operation.",  sig->get_name().c_str());
 221                                 return -1;
 222                         }
 223                 }
 224                 else
 225                 {
 226                         if(sig->get_supported())
 227                         {AFB_DEBUG("%s cancelled due to unsubscribe", sig->get_name().c_str());}
 228                         else
 229                         {
 230                                 AFB_WARNING("signal: %s isn't supported. Canceling operation.", sig->get_name().c_str());
 231                                 return -1;
 232                         }
 233                 }
 234                 int ret = subscribe_unsubscribe_signal(request, subscribe, can_subscription, s);
 235                 if(ret < 0)
 236                         return ret;
 237
 238                 rets++;
 239         }
 240
 241         return rets;
 242 }
 243
 244 static int subscribe_unsubscribe_signals(afb_req_t request,
 245                                              bool subscribe,
 246                                              std::vector<std::shared_ptr<signal_t> > signals,
 247                                              struct event_filter_t& event_filter,
 248                                              std::map<int, std::shared_ptr<low_can_subscription_t> >& s)
 249 {
 250         int rets = 0;
 251         for(const auto& sig: signals)
 252         {
 253                 auto it =  std::find_if(s.begin(), s.end(), [&sig, &event_filter](std::pair<int, std::shared_ptr<low_can_subscription_t> > sub){ return sub.second->is_signal_subscription_corresponding(sig, event_filter) ; });
 254                 std::shared_ptr<low_can_subscription_t> can_subscription;
 255                 if(it != s.end())
 256                         {can_subscription = it->second;}
 257                 else
 258                 {
 259                         can_subscription = std::make_shared<low_can_subscription_t>(low_can_subscription_t(event_filter));
 260                         if(can_subscription->create_rx_filter(sig) < 0)
 261                                 {return -1;}
 262                         if(add_to_event_loop(can_subscription) < 0)
 263                                 {return -1;}
 264                 }
 265
 266                 if(subscribe_unsubscribe_signal(request, subscribe, can_subscription, s) < 0)
 267                         {return -1;}
 268
 269                 rets++;
 270                 AFB_DEBUG("%s Signal: %s %ssubscribed", sig->get_message()->is_fd() ? "FD": "", sig->get_name().c_str(), subscribe ? "":"un");
 271         }
 272         return rets;
 273 }
 274
 275 ///
 276 /// @brief subscribe to all signals in the vector signals
 277 ///
 278 /// @param[in] afb_req request : contains original request use to subscribe or unsubscribe
 279 /// @param[in] subscribe boolean value, which chooses between a subscription operation or an unsubscription
 280 /// @param[in] signals -  struct containing vectors with signal_t and diagnostic_messages to subscribe
 281 ///
 282 /// @return Number of correctly subscribed signal
 283 ///
 284 static int subscribe_unsubscribe_signals(afb_req_t request,
 285                                          bool subscribe,
 286                                          const struct utils::signals_found& signals,
 287                                          struct event_filter_t& event_filter)
 288 {
 289         int rets = 0;
 290         utils::signals_manager_t& sm = utils::signals_manager_t::instance();
 291
 292         std::lock_guard<std::mutex> subscribed_signals_lock(sm.get_subscribed_signals_mutex());
 293         std::map<int, std::shared_ptr<low_can_subscription_t> >& s = sm.get_subscribed_signals();
 294
 295         rets += subscribe_unsubscribe_diagnostic_messages(request, subscribe, signals.diagnostic_messages, event_filter, s, false);
 296         rets += subscribe_unsubscribe_signals(request, subscribe, signals.signals, event_filter, s);
 297
 298         return rets;
 299 }
 300
 301 static event_filter_t generate_filter(json_object* args)
 302 {
 303         event_filter_t event_filter;
 304         struct json_object  *filter, *obj;
 305
 306                 // computes the filter
 307         if (json_object_object_get_ex(args, "filter", &filter))
 308         {
 309                 if (json_object_object_get_ex(filter, "frequency", &obj)
 310                 && (json_object_is_type(obj, json_type_double) || json_object_is_type(obj, json_type_int)))
 311                         {event_filter.frequency = (float)json_object_get_double(obj);}
 312                 if (json_object_object_get_ex(filter, "min", &obj)
 313                 && (json_object_is_type(obj, json_type_double) || json_object_is_type(obj, json_type_int)))
 314                         {event_filter.min = (float)json_object_get_double(obj);}
 315                 if (json_object_object_get_ex(filter, "max", &obj)
 316                 && (json_object_is_type(obj, json_type_double) || json_object_is_type(obj, json_type_int)))
 317                         {event_filter.max = (float)json_object_get_double(obj);}
 318         }
 319         return event_filter;
 320 }
 321
 322
 323 static int one_subscribe_unsubscribe_events(afb_req_t request, bool subscribe, const std::string& tag, json_object* args)
 324 {
 325         int ret = 0;
 326         struct utils::signals_found sf;
 327
 328         // subscribe or unsubscribe
 329         openxc_DynamicField search_key = build_DynamicField(tag);
 330         sf = utils::signals_manager_t::instance().find_signals(search_key);
 331         if (sf.signals.empty() && sf.diagnostic_messages.empty())
 332         {
 333                 AFB_NOTICE("No signal(s) found for %s.", tag.c_str());
 334                 ret = -1;
 335         }
 336         else
 337         {
 338                 event_filter_t event_filter = generate_filter(args);
 339                 ret = subscribe_unsubscribe_signals(request, subscribe, sf, event_filter);
 340         }
 341         return ret;
 342 }
 343
 344 static int one_subscribe_unsubscribe_id(afb_req_t request, bool subscribe, const uint32_t& id ,json_object *args)
 345 {
 346         int ret = 0;
 347         std::shared_ptr<message_definition_t> message_definition = application_t::instance().get_message_definition(id);
 348         struct utils::signals_found sf;
 349
 350         if(message_definition)
 351         {
 352                 sf.signals = message_definition->get_signals();
 353         }
 354
 355         if(sf.signals.empty())
 356         {
 357                 AFB_NOTICE("No signal(s) found for %d.", id);
 358                 ret = -1;
 359         }
 360         else
 361         {
 362                 event_filter_t event_filter = generate_filter(args);
 363                 ret = subscribe_unsubscribe_signals(request, subscribe, sf, event_filter);
 364         }
 365         return ret;
 366 }
 367
 368
 369 static int process_one_subscribe_args(afb_req_t request, bool subscribe, json_object *args)
 370 {
 371         int rc = 0, rc2=0;
 372         json_object *x = nullptr, *event = nullptr, *id = nullptr;
 373
 374
 375         // 2 cases : ID(PGN) and event
 376
 377         json_bool test_event = json_object_object_get_ex(args,"event",&event);
 378         json_bool test_id = json_object_object_get_ex(args,"id",&id);
 379         if(!test_id)
 380         {
 381                 json_object_object_get_ex(args,"pgn",&id);
 382         }
 383
 384         if(     args == NULL || (!test_event && !id))
 385         {
 386                 rc = one_subscribe_unsubscribe_events(request, subscribe, "*", args);
 387         }
 388         else
 389         {
 390                 if(event)
 391                 {
 392                         if (json_object_get_type(event) != json_type_array) // event is set before and check if it's an array
 393                         {
 394                                 rc = one_subscribe_unsubscribe_events(request, subscribe, json_object_get_string(event), args);
 395                         }
 396                         else // event is set and it's not an array
 397                         {
 398                                 for (int i = 0 ; i < json_object_array_length(event); i++)
 399                                 {
 400                                         x = json_object_array_get_idx(event, i);
 401                                         rc2 = one_subscribe_unsubscribe_events(request, subscribe, json_object_get_string(x), args);
 402                                         if (rc >= 0)
 403                                                 rc = rc2 >= 0 ? rc + rc2 : rc2;
 404                                 }
 405                         }
 406                 }
 407
 408                 if(id)
 409                 {
 410                         if (json_object_get_type(id) != json_type_array) // id is set before and check if it's an array
 411                         {
 412                                 rc = one_subscribe_unsubscribe_id(request, subscribe, json_object_get_int(id), args);
 413                         }
 414                         else // event is set and it's not an array
 415                         {
 416                                 for (int i = 0 ; i < json_object_array_length(id); i++)
 417                                 {
 418                                         x = json_object_array_get_idx(id, i);
 419                                         rc2 = one_subscribe_unsubscribe_id(request, subscribe, json_object_get_int(x), args);
 420                                         if (rc >= 0)
 421                                                 rc = rc2 >= 0 ? rc + rc2 : rc2;
 422                                 }
 423                         }
 424                 }
 425         }
 426         return rc;
 427 }
 428
 429 static void do_subscribe_unsubscribe(afb_req_t request, bool subscribe)
 430 {
 431         int rc = 0;
 432         struct json_object *args, *x;
 433
 434         args = afb_req_json(request);
 435         if (json_object_get_type(args) == json_type_array)
 436         {
 437                 for(int i = 0; i < json_object_array_length(args); i++)
 438                 {
 439                         x = json_object_array_get_idx(args, i);
 440                         rc += process_one_subscribe_args(request, subscribe, x);
 441                 }
 442         }
 443         else
 444         {
 445                 rc += process_one_subscribe_args(request, subscribe, args);
 446         }
 447
 448         if (rc >= 0)
 449                 afb_req_success(request, NULL, NULL);
 450         else
 451                 afb_req_fail(request, "error", NULL);
 452 }
 453
 454 void auth(afb_req_t request)
 455 {
 456         afb_req_session_set_LOA(request, 1);
 457         afb_req_success(request, NULL, NULL);
 458 }
 459
 460 void subscribe(afb_req_t request)
 461 {
 462         do_subscribe_unsubscribe(request, true);
 463 }
 464
 465 void unsubscribe(afb_req_t request)
 466 {
 467         do_subscribe_unsubscribe(request, false);
 468 }
 469
 470 static int send_frame(struct canfd_frame& cfd, const std::string& bus_name)
 471 {
 472         if(bus_name.empty()) {
 473                 return -1;
 474         }
 475
 476         std::map<std::string, std::shared_ptr<low_can_subscription_t> >& cd = application_t::instance().get_can_devices();
 477
 478         if( cd.count(bus_name) == 0)
 479                 {cd[bus_name] = std::make_shared<low_can_subscription_t>(low_can_subscription_t());}
 480
 481         return low_can_subscription_t::tx_send(*cd[bus_name], cfd, bus_name);
 482 }
 483
 484 static void write_raw_frame(afb_req_t request, const std::string& bus_name, json_object *json_value)
 485 {
 486         struct canfd_frame cfd;
 487         struct json_object *can_data = nullptr;
 488
 489         ::memset(&cfd, 0, sizeof(cfd));
 490
 491         if(wrap_json_unpack(json_value, "{si, si, so !}",
 492                               "can_id", &cfd.can_id,
 493                               "can_dlc", &cfd.len,
 494                               "can_data", &can_data))
 495         {
 496                 afb_req_fail(request, "Invalid", "Frame object malformed");
 497                 return;
 498         }
 499
 500         if(cfd.len <= 8 && cfd.len > 0)
 501         {
 502                 for (int i = 0 ; i < cfd.len ; i++)
 503                 {
 504                         struct json_object *one_can_data = json_object_array_get_idx(can_data, i);
 505                         cfd.data[i] = (json_object_is_type(one_can_data, json_type_int)) ?
 506                                         (uint8_t)json_object_get_int(one_can_data) : 0;
 507                 }
 508         }
 509         else
 510         {
 511                 afb_req_fail(request, "Invalid", "Data array must hold 1 to 8 values.");
 512                 return;
 513         }
 514
 515         if(! send_frame(cfd, application_t::instance().get_can_bus_manager().get_can_device_name(bus_name)))
 516                 afb_req_success(request, nullptr, "Message correctly sent");
 517         else
 518                 afb_req_fail(request, "Error", "sending the message. See the log for more details.");
 519 }
 520
 521 static void write_signal(afb_req_t request, const std::string& name, json_object *json_value)
 522 {
 523         struct canfd_frame cfd;
 524         struct utils::signals_found sf;
 525         signal_encoder encoder = nullptr;
 526         bool send = true;
 527
 528         ::memset(&cfd, 0, sizeof(cfd));
 529
 530         openxc_DynamicField search_key = build_DynamicField(name);
 531         sf = utils::signals_manager_t::instance().find_signals(search_key);
 532         openxc_DynamicField dynafield_value = build_DynamicField(json_value);
 533
 534         if (sf.signals.empty())
 535         {
 536                 afb_req_fail_f(request, "No signal(s) found for %s. Message not sent.", name.c_str());
 537                 return;
 538         }
 539
 540         std::shared_ptr<signal_t>& sig = sf.signals[0];
 541         if(! sig->get_writable())
 542         {
 543                 afb_req_fail_f(request, "%s isn't writable. Message not sent.", sig->get_name().c_str());
 544                 return;
 545         }
 546
 547         uint64_t value = (encoder = sig->get_encoder()) ?
 548                         encoder(*sig, dynafield_value, &send) :
 549                         encoder_t::encode_DynamicField(*sig, dynafield_value, &send);
 550
 551         cfd = encoder_t::build_frame(sig, value);
 552         if(! send_frame(cfd, sig->get_message()->get_bus_device_name()) && send)
 553                 afb_req_success(request, nullptr, "Message correctly sent");
 554         else
 555                 afb_req_fail(request, "Error", "Sending the message. See the log for more details.");
 556 }
 557
 558 void write(afb_req_t request)
 559 {
 560         struct json_object* args = nullptr, *json_value = nullptr;
 561         const char *name = nullptr;
 562
 563         args = afb_req_json(request);
 564
 565         // Process about Raw CAN message on CAN bus directly
 566         if (args != NULL && ! wrap_json_unpack(args, "{ss, so !}",
 567                                                "bus_name", &name,
 568                                                "frame", &json_value))
 569                 write_raw_frame(request, name, json_value);
 570
 571         // Search signal then encode value.
 572         else if(args != NULL &&
 573                 ! wrap_json_unpack(args, "{ss, so !}",
 574                                    "signal_name", &name,
 575                                    "signal_value", &json_value))
 576                 write_signal(request, std::string(name), json_value);
 577         else
 578                 afb_req_fail(request, "Error", "Request argument malformed");
 579 }
 580
 581 static struct json_object *get_signals_value(const std::string& name)
 582 {
 583         struct utils::signals_found sf;
 584         struct json_object *ans = nullptr;
 585
 586         openxc_DynamicField search_key = build_DynamicField(name);
 587         sf = utils::signals_manager_t::instance().find_signals(search_key);
 588
 589         if (sf.signals.empty())
 590         {
 591                 AFB_WARNING("No signal(s) found for %s.", name.c_str());
 592                 return NULL;
 593         }
 594         ans = json_object_new_array();
 595         for(const auto& sig: sf.signals)
 596         {
 597                 struct json_object *jobj = json_object_new_object();
 598                 json_object_object_add(jobj, "event", json_object_new_string(sig->get_name().c_str()));
 599                 json_object_object_add(jobj, "value", json_object_new_double(sig->get_last_value()));
 600                 json_object_array_add(ans, jobj);
 601         }
 602
 603         return ans;
 604 }
 605 void get(afb_req_t request)
 606 {
 607         int rc = 0;
 608         struct json_object* args = nullptr,
 609                 *json_name = nullptr;
 610         json_object *ans = nullptr;
 611
 612         args = afb_req_json(request);
 613
 614         // Process about Raw CAN message on CAN bus directly
 615         if (args != nullptr &&
 616                 (json_object_object_get_ex(args, "event", &json_name) && json_object_is_type(json_name, json_type_string) ))
 617         {
 618                 ans = get_signals_value(json_object_get_string(json_name));
 619                 if (!ans)
 620                         rc = -1;
 621         }
 622         else
 623         {
 624                 AFB_ERROR("Request argument malformed. Please use the following syntax:");
 625                 rc = -1;
 626         }
 627
 628         if (rc >= 0)
 629                 afb_req_success(request, ans, NULL);
 630         else
 631                 afb_req_fail(request, "error", NULL);
 632 }
 633
 634
 635 static struct json_object *list_can_message(const std::string& name)
 636 {
 637         struct utils::signals_found sf;
 638         struct json_object *ans = nullptr;
 639
 640         openxc_DynamicField search_key = build_DynamicField(name);
 641         sf = utils::signals_manager_t::instance().find_signals(search_key);
 642
 643         if (sf.signals.empty() && sf.diagnostic_messages.empty())
 644         {
 645                 AFB_WARNING("No signal(s) found for %s.", name.c_str());
 646                 return NULL;
 647         }
 648         ans = json_object_new_array();
 649         for(const auto& sig: sf.signals)
 650         {
 651                 json_object_array_add(ans,
 652                         json_object_new_string(sig->get_name().c_str()));
 653         }
 654         for(const auto& sig: sf.diagnostic_messages)
 655         {
 656                 json_object_array_add(ans,
 657                         json_object_new_string(sig->get_name().c_str()));
 658         }
 659
 660         return ans;
 661 }
 662
 663 void list(afb_req_t request)
 664 {
 665         int rc = 0;
 666         json_object *ans = nullptr;
 667         struct json_object* args = nullptr,
 668                 *json_name = nullptr;
 669         args = afb_req_json(request);
 670         const char *name;
 671         if ((args != nullptr) &&
 672                 (json_object_object_get_ex(args, "event", &json_name) && json_object_is_type(json_name, json_type_string)))
 673         {
 674                 name = json_object_get_string(json_name);
 675         }
 676         else
 677         {
 678                 name = "*";
 679         }
 680
 681         ans = list_can_message(name);
 682         if (!ans)
 683                 rc = -1;
 684
 685         if (rc >= 0)
 686                 afb_req_success(request, ans, NULL);
 687         else
 688                 afb_req_fail(request, "error", NULL);
 689 }
 690
 691 /// @brief Initialize the binding.
 692 ///
 693 /// @param[in] service Structure which represent the Application Framework Binder.
 694 ///
 695 /// @return Exit code, zero if success.
 696 int init_binding(afb_api_t api)
 697 {
 698         uint32_t ret = 1;
 699         can_bus_t& can_bus_manager = application_t::instance().get_can_bus_manager();
 700
 701         can_bus_manager.set_can_devices();
 702         can_bus_manager.start_threads();
 703         utils::signals_manager_t& sm = utils::signals_manager_t::instance();
 704
 705         /// Initialize Diagnostic manager that will handle obd2 requests.
 706         /// We pass by default the first CAN bus device to its Initialization.
 707         /// TODO: be able to choose the CAN bus device that will be use as Diagnostic bus.
 708         if(application_t::instance().get_diagnostic_manager().initialize())
 709                 ret = 0;
 710
 711         // Add a recurring dignostic message request to get engine speed at all times.
 712         openxc_DynamicField search_key = build_DynamicField("diagnostic_messages.engine.speed");
 713         struct utils::signals_found sf = sm.find_signals(search_key);
 714
 715         if(sf.signals.empty() && sf.diagnostic_messages.size() == 1)
 716         {
 717                 afb_req_t request = nullptr;
 718
 719                 struct event_filter_t event_filter;
 720                 event_filter.frequency = sf.diagnostic_messages.front()->get_frequency();
 721
 722                 std::map<int, std::shared_ptr<low_can_subscription_t> >& s = sm.get_subscribed_signals();
 723
 724                 subscribe_unsubscribe_diagnostic_messages(request, true, sf.diagnostic_messages, event_filter, s, true);
 725         }
 726
 727         if(ret)
 728                 AFB_ERROR("There was something wrong with CAN device Initialization.");
 729
 730         return ret;
 731 }