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-utils.hpp"
33 #include "can-signals.hpp"
34 #include "openxc-utils.hpp"
38 #include <afb/afb-service-itf.h>
42 * Interface between the daemon and the binding
44 const struct afb_binding_interface *binder_interface;
46 /********************************************************************************
48 * Subscription and unsubscription
50 *********************************************************************************/
52 static int make_subscription_unsubscription(struct afb_req request, std::map<std::string, struct afb_event>::iterator& ss_i, bool subscribe)
54 /* Make the subscription or unsubscription to the event */
55 if (((subscribe ? afb_req_subscribe : afb_req_unsubscribe)(request, ss_i->second)) < 0)
57 ERROR(binder_interface, "Operation goes wrong for signal: %s", ss_i->first);
64 static int create_event_handle(std::map<std::string, struct afb_event>::iterator& ss_i)
66 ss_i->second = afb_daemon_make_event(binder_interface->daemon, ss_i->first.c_str());
67 if (!afb_event_is_valid(ss_i->second))
69 ERROR(binder_interface, "Can't create an event, something goes wrong.");
76 static int subscribe_unsubscribe_signal(struct afb_req request, bool subscribe, const CanSignal& sig)
80 std::lock_guard<std::mutex> subscribed_signals_lock(subscribed_signals_mutex);
81 auto ss_i = subscribed_signals.find(sig.genericName);
82 if (ss_i != subscribed_signals.end() && !afb_event_is_valid(ss_i->second))
86 NOTICE(binder_interface, "Event isn't valid, it can't be unsubscribed.");
91 /* Event it isn't valid annymore, recreate it */
92 ret = create_event_handle(ss_i);
97 /* Event don't exist , so let's create it */
98 struct afb_event empty_event = {nullptr, nullptr};
99 auto ss_i = subscribed_signals.insert(std::make_pair(sig.genericName, empty_event));
100 ret = create_event_handle(ss_i.first);
103 /* Check whether or not the event handler has been correctly created and
104 * make the subscription/unsubscription operation is so.
108 return make_subscription_unsubscription(request, ss_i, subscribe);
111 static int subscribe_unsubscribe_signals(struct afb_req request, bool subscribe, const std::vector<CanSignal>& signals)
115 for(const auto& signal_i : signals)
117 ret = subscribe_unsubscribe_signal(request, subscribe, signal_i);
124 static int subscribe_unsubscribe_all(struct afb_req request, bool subscribe)
128 //for (const auto& sig : SIGNALS)
129 // e += !subscribe_unsubscribe_signals(request, subscribe, sig);
130 e += !subscribe_unsubscribe_signals(request, subscribe, getSignals());
135 static int subscribe_unsubscribe_name(struct afb_req request, bool subscribe, const char *name)
137 std::vector<CanSignal> sig;
140 if (!::strcmp(name, "*"))
141 ret = subscribe_unsubscribe_all(request, subscribe);
144 //if(obd2_handler_c.is_obd2_signal(name))
151 openxc_DynamicField search_key = build_DynamicField(name);
152 sig = find_can_signals(search_key);
156 ret = subscribe_unsubscribe_signals(request, subscribe, sig);
161 static void subscribe_unsubscribe(struct afb_req request, bool subscribe)
164 struct json_object *args, *a, *x;
166 /* makes the subscription/unsubscription */
167 args = afb_req_json(request);
168 if (args == NULL || !json_object_object_get_ex(args, "event", &a)) {
169 ok = subscribe_unsubscribe_all(request, subscribe);
170 } else if (json_object_get_type(a) != json_type_array) {
171 ok = subscribe_unsubscribe_name(request, subscribe, json_object_get_string(a));
173 n = json_object_array_length(a);
175 for (i = 0 ; i < n ; i++) {
176 x = json_object_array_get_idx(a, i);
177 if (subscribe_unsubscribe_name(request, subscribe, json_object_get_string(x)))
183 /* send the report */
185 afb_req_success(request, NULL, NULL);
187 afb_req_fail(request, "error", NULL);
192 static void subscribe(struct afb_req request)
194 subscribe_unsubscribe(request, true);
197 static void unsubscribe(struct afb_req request)
199 subscribe_unsubscribe(request, false);
202 static const struct afb_verb_desc_v1 verbs[]=
204 { .name= "subscribe", .session= AFB_SESSION_NONE, .callback= subscribe, .info= "subscribe to notification of CAN bus messages." },
205 { .name= "unsubscribe", .session= AFB_SESSION_NONE, .callback= unsubscribe, .info= "unsubscribe a previous subscription." }
208 static const struct afb_binding binding_desc {
209 AFB_BINDING_VERSION_1,
217 const struct afb_binding *afbBindingV1Register (const struct afb_binding_interface *itf)
219 binder_interface = itf;
221 return &binding_desc;
225 * @brief Initialize the binding.
227 * @param[in] service Structure which represent the Application Framework Binder.
229 * @return Exit code, zero if success.
231 int afbBindingV1ServiceInit(struct afb_service service)
234 fd_conf = afb_daemon_rootdir_open_locale(binder_interface->daemon, "can_bus.json", O_RDONLY, NULL);
236 /* Initialize the CAN bus handler */
237 can_bus_t can_bus_handler(fd_conf);
239 /* Open CAN socket */
240 if(can_bus_handler.init_can_dev() == 0)
242 can_bus_handler.start_threads();
245 ERROR(binder_interface, "There was something wrong with CAN device Initialization. Check your config file maybe");