2 * Copyright (C) 2015, 2016 "IoT.bzh"
3 * Author "Romain Forlot" <romain.forlot@iot.bzh>
4 * Author "Loic Collignon" <loic.collignon@iot.bzh>
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
10 * http://www.apache.org/licenses/LICENSE-2.0
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.
19 #include "low-can-binding.hpp"
26 #include <linux/can.h>
27 #include <json-c/json.h>
28 #include <systemd/sd-event.h>
31 #include "openxc.pb.h"
32 #include "can-bus.hpp"
33 #include "can-signals.hpp"
34 #include "can-message.hpp"
35 #include "openxc-utils.hpp"
39 #include <afb/afb-service-itf.h>
43 * Interface between the daemon and the binding
45 const struct afb_binding_interface *binder_interface;
47 can_bus_t *can_bus_handler;
49 /********************************************************************************
51 * Subscription and unsubscription
53 *********************************************************************************/
55 static int make_subscription_unsubscription(struct afb_req request, std::map<std::string, struct afb_event>::iterator& ss_i, bool subscribe)
57 /* Make the subscription or unsubscription to the event */
58 if (((subscribe ? afb_req_subscribe : afb_req_unsubscribe)(request, ss_i->second)) < 0)
60 ERROR(binder_interface, "Operation goes wrong for signal: %s", ss_i->first);
67 static int create_event_handle(std::map<std::string, struct afb_event>::iterator& ss_i)
69 ss_i->second = afb_daemon_make_event(binder_interface->daemon, ss_i->first.c_str());
70 if (!afb_event_is_valid(ss_i->second))
72 ERROR(binder_interface, "Can't create an event, something goes wrong.");
79 static int subscribe_unsubscribe_signal(struct afb_req request, bool subscribe, const CanSignal& sig)
83 std::lock_guard<std::mutex> subscribed_signals_lock(get_subscribed_signals_mutex());
84 auto ss_i = subscribed_signals.find(sig.genericName);
85 if (ss_i != subscribed_signals.end() && !afb_event_is_valid(ss_i->second))
89 NOTICE(binder_interface, "Event isn't valid, it can't be unsubscribed.");
94 /* Event it isn't valid annymore, recreate it */
95 ret = create_event_handle(ss_i);
100 /* Event don't exist , so let's create it */
101 struct afb_event empty_event = {nullptr, nullptr};
102 auto ss_i = subscribed_signals.insert(std::make_pair(sig.genericName, empty_event));
103 ret = create_event_handle(ss_i.first);
106 /* Check whether or not the event handler has been correctly created and
107 * make the subscription/unsubscription operation is so.
111 return make_subscription_unsubscription(request, ss_i, subscribe);
114 static int subscribe_unsubscribe_signals(struct afb_req request, bool subscribe, const std::vector<CanSignal>& signals)
118 for(const auto& signal_i : signals)
120 ret = subscribe_unsubscribe_signal(request, subscribe, signal_i);
127 static int subscribe_unsubscribe_all(struct afb_req request, bool subscribe)
131 //for (const auto& sig : SIGNALS)
132 // e += !subscribe_unsubscribe_signals(request, subscribe, sig);
133 e += !subscribe_unsubscribe_signals(request, subscribe, getSignals());
138 static int subscribe_unsubscribe_name(struct afb_req request, bool subscribe, const char *name)
140 std::vector<CanSignal> sig;
143 if (!::strcmp(name, "*"))
144 ret = subscribe_unsubscribe_all(request, subscribe);
147 //if(obd2_handler_c.is_obd2_signal(name))
154 openxc_DynamicField search_key = build_DynamicField(name);
155 sig = find_can_signals(search_key);
159 ret = subscribe_unsubscribe_signals(request, subscribe, sig);
164 static void subscribe_unsubscribe(struct afb_req request, bool subscribe)
167 struct json_object *args, *a, *x;
169 /* makes the subscription/unsubscription */
170 args = afb_req_json(request);
171 if (args == NULL || !json_object_object_get_ex(args, "event", &a)) {
172 ok = subscribe_unsubscribe_all(request, subscribe);
173 } else if (json_object_get_type(a) != json_type_array) {
174 ok = subscribe_unsubscribe_name(request, subscribe, json_object_get_string(a));
176 n = json_object_array_length(a);
178 for (i = 0 ; i < n ; i++) {
179 x = json_object_array_get_idx(a, i);
180 if (subscribe_unsubscribe_name(request, subscribe, json_object_get_string(x)))
186 /* send the report */
188 afb_req_success(request, NULL, NULL);
190 afb_req_fail(request, "error", NULL);
195 static void subscribe(struct afb_req request)
197 subscribe_unsubscribe(request, true);
200 static void unsubscribe(struct afb_req request)
202 subscribe_unsubscribe(request, false);
205 static const struct afb_verb_desc_v1 verbs[]=
207 { .name= "subscribe", .session= AFB_SESSION_NONE, .callback= subscribe, .info= "subscribe to notification of CAN bus messages." },
208 { .name= "unsubscribe", .session= AFB_SESSION_NONE, .callback= unsubscribe, .info= "unsubscribe a previous subscription." }
211 static const struct afb_binding binding_desc {
212 AFB_BINDING_VERSION_1,
214 "Low level CAN bus service",
220 const struct afb_binding *afbBindingV1Register (const struct afb_binding_interface *itf)
222 binder_interface = itf;
224 return &binding_desc;
228 * @brief Initialize the binding.
230 * @param[in] service Structure which represent the Application Framework Binder.
232 * @return Exit code, zero if success.
234 int afbBindingV1ServiceInit(struct afb_service service)
237 fd_conf = afb_daemon_rootdir_open_locale(binder_interface->daemon, "can_buses.json", O_RDONLY, NULL);
239 /* Initialize the CAN bus handler */
240 can_bus_handler = new can_bus_t(fd_conf);
242 /* Open CAN socket */
243 if(can_bus_handler->init_can_dev() == 0)
245 can_bus_handler->start_threads();
248 ERROR(binder_interface, "There was something wrong with CAN device Initialization. Check your config file maybe");