src/low-can-binding.cpp

   1 /*
   2  * Copyright (C) 2015, 2016 "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 <map>
  20 #include <queue>
  21 #include <vector>
  22 #include <string>
  23 #include <memory>
  24 #include <thread>
  25 #include <fcntl.h>
  26 #include <errno.h>
  27 #include <unistd.h>
  28 #include <net/if.h>
  29 #include <functional>
  30 #include <sys/ioctl.h>
  31 #include <linux/can.h>
  32 #include <openxc.pb.h>
  33 #include <sys/timeb.h>
  34 #include <sys/types.h>
  35 #include <sys/socket.h>
  36 #include <json-c/json.h>
  37 #include <linux/can/raw.h>
  38 #include <systemd/sd-event.h>
  39
  40 #include "timer.hpp"
  41 #include "openxc.pb.h"
  42 #include "can-utils.hpp"
  43 #include "can-signals.hpp"
  44 #include "can-decoder.hpp"
  45 #include "openxc-utils.hpp"
  46
  47 #include "low-can-binding.hpp"
  48
  49 extern "C"
  50 {
  51         #include <afb/afb-binding.h>
  52         #include <afb/afb-service-itf.h>
  53 };
  54
  55 /*
  56  *      Interface between the daemon and the binding
  57  */
  58 const struct afb_binding_interface *binder_interface;
  59
  60 /********************************************************************************
  61 *
  62 *               Event management
  63 *
  64 *********************************************************************************/
  65
  66 /********************************************************************************
  67 *
  68 *               Subscription and unsubscription
  69 *
  70 *********************************************************************************/
  71
  72 static int subscribe_unsubscribe_signal(struct afb_req request, bool subscribe, const CanSignal& sig)
  73 {
  74         int ret;
  75
  76         // TODO: lock the subscribed_signals when insert/remove
  77         const auto& ss_i = subscribed_signals.find(sig.genericName);
  78         if (ss_i != subscribed_signals.end())
  79         {
  80                 if(!afb_event_is_valid(ss_i->second))
  81                 {
  82                         if(!subscribe)
  83                         {
  84                                 NOTICE(binder_interface, "Event isn't valid, it can't be unsubscribed.");
  85                                 ret = 1;
  86                         }
  87                         else
  88                         {
  89                                 ss_i->second = afb_daemon_make_event(binder_interface->daemon, ss_i->first.c_str());
  90                                 if (!afb_event_is_valid(ss_i->second))
  91                                 {
  92                                         ERROR(binder_interface, "Can't create an event, something goes wrong.");
  93                                         ret = 0;
  94                                 }
  95                         }
  96                 }
  97         }
  98         else
  99         {
 100                 subscribed_signals[sig.genericName] = afb_daemon_make_event(binder_interface->daemon, sig.genericName);
 101                 if (!afb_event_is_valid(ss_i->second))
 102                 {
 103                         ERROR(binder_interface, "Can't create an event, something goes wrong.");
 104                         ret = 0;
 105                 }
 106         }
 107
 108         if (((subscribe ? afb_req_subscribe : afb_req_unsubscribe)(request, subscribed_signals[sig.genericName])) < 0)
 109         {
 110                 ERROR(binder_interface, "Operation goes wrong for signal: %s", sig.genericName);
 111                 ret = 0;
 112         }
 113         else
 114                 ret = 1;
 115
 116         return ret;
 117 }
 118
 119 static int subscribe_unsubscribe_signals(struct afb_req request, bool subscribe, const std::vector<CanSignal>& signals)
 120 {
 121         int ret = 0;
 122
 123         for(const auto& signal_i : signals)
 124         {
 125                 ret = subscribe_unsubscribe_signal(request, subscribe, signal_i);
 126                 if(ret == 0)
 127                         return ret;
 128         }
 129         return ret;
 130 }
 131
 132 static int subscribe_unsubscribe_all(struct afb_req request, bool subscribe)
 133 {
 134         int e = 0;
 135
 136         //for (const auto& sig : SIGNALS)
 137         //      e += !subscribe_unsubscribe_signals(request, subscribe, sig);
 138         e += !subscribe_unsubscribe_signals(request, subscribe, getSignals());
 139
 140         return e == 0;
 141 }
 142
 143 static int subscribe_unsubscribe_name(struct afb_req request, bool subscribe, const char *name)
 144 {
 145         std::vector<CanSignal> sig;
 146         int ret = 0;
 147
 148         if (!::strcmp(name, "*"))
 149                 ret = subscribe_unsubscribe_all(request, subscribe);
 150         else
 151         {
 152                 //if(obd2_handler_c.is_obd2_signal(name))
 153                 if(false)
 154                 {
 155                 // TODO
 156                 }
 157                 else
 158                 {
 159                         openxc_DynamicField search_key = build_DynamicField(name);
 160                         sig = find_can_signals(binder_interface, search_key);
 161                         if (sig.empty())
 162                                 ret = 0;
 163                 }
 164                 ret = subscribe_unsubscribe_signals(request, subscribe, sig);
 165         }
 166         return ret;
 167 }
 168
 169 static void subscribe_unsubscribe(struct afb_req request, bool subscribe)
 170 {
 171         int ok, i, n;
 172         struct json_object *args, *a, *x;
 173
 174         /* makes the subscription/unsubscription */
 175         args = afb_req_json(request);
 176         if (args == NULL || !json_object_object_get_ex(args, "event", &a)) {
 177                 ok = subscribe_unsubscribe_all(request, subscribe);
 178         } else if (json_object_get_type(a) != json_type_array) {
 179                 ok = subscribe_unsubscribe_name(request, subscribe, json_object_get_string(a));
 180         } else {
 181                 n = json_object_array_length(a);
 182                 ok = 0;
 183                 for (i = 0 ; i < n ; i++) {
 184                         x = json_object_array_get_idx(a, i);
 185                         if (subscribe_unsubscribe_name(request, subscribe, json_object_get_string(x)))
 186                                 ok++;
 187                 }
 188                 ok = (ok == n);
 189         }
 190
 191         /* send the report */
 192         if (ok)
 193                 afb_req_success(request, NULL, NULL);
 194         else
 195                 afb_req_fail(request, "error", NULL);
 196 }
 197
 198 static const struct afb_verb_desc_v1 verbs[]=
 199 {
 200         { .name= "subscribe",   .session= AFB_SESSION_NONE, .callback= subscribe,       .info= "subscribe to notification of CAN bus messages." },
 201         { .name= "unsubscribe", .session= AFB_SESSION_NONE, .callback= unsubscribe,     .info= "unsubscribe a previous subscription." }
 202 };
 203
 204 static const struct afb_binding binding_desc {
 205         AFB_BINDING_VERSION_1,
 206         {
 207                 "CAN bus service",
 208                 "can",
 209                 verbs
 210         }
 211 };
 212
 213 extern "C"
 214 {
 215         static void subscribe(struct afb_req request)
 216         {
 217                 subscribe_unsubscribe(request, true);
 218         }
 219
 220         static void unsubscribe(struct afb_req request)
 221         {
 222                 subscribe_unsubscribe(request, false);
 223         }
 224
 225         const struct afb_binding *afbBindingV1Register (const struct afb_binding_interface *itf)
 226         {
 227                 binder_interface = itf;
 228
 229                 return &binding_desc;
 230         }
 231
 232         /**
 233         * @brief Initialize the binding.
 234         *
 235         * @param[in] service Structure which represent the Application Framework Binder.
 236         *
 237         * @return Exit code, zero if success.
 238         */
 239         int afbBindingV1ServiceInit(struct afb_service service)
 240         {
 241                 int fd_conf;
 242                 fd_conf = afb_daemon_rootdir_open_locale(binder_interface->daemon, "can_bus.json", O_RDONLY, NULL);
 243
 244                 /* Open CAN socket */
 245                 can_bus_t can_bus_handler(binder_interface, fd_conf);
 246                 if(can_bus_handler.init_can_dev() == 0)
 247                 {
 248                         can_bus_handler.start_threads();
 249                         return 0;
 250                 }
 251
 252                 return 1;
 253         }
 254 };