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 "signals.hpp"
32 #include "can-bus.hpp"
33 #include "openxc.pb.h"
34 #include "can-signals.hpp"
35 #include "can-message.hpp"
36 #include "openxc-utils.hpp"
40 #include <afb/afb-service-itf.h>
44 * Interface between the daemon and the binding
46 const struct afb_binding_interface *binder_interface;
48 can_bus_t *can_bus_handler;
50 /********************************************************************************
52 * Subscription and unsubscription
54 *********************************************************************************/
56 static int make_subscription_unsubscription(struct afb_req request, const std::string& sig_name, std::map<std::string, struct afb_event>& s, bool subscribe)
58 /* Make the subscription or unsubscription to the event */
59 if (((subscribe ? afb_req_subscribe : afb_req_unsubscribe)(request, s[sig_name.c_str()])) < 0)
61 ERROR(binder_interface, "Operation goes wrong for signal: %s", sig_name);
68 static int create_event_handle(const std::string& sig_name, std::map<std::string, struct afb_event>& s)
70 s[sig_name] = afb_daemon_make_event(binder_interface->daemon, sig_name.c_str());
71 if (!afb_event_is_valid(s[sig_name]))
73 ERROR(binder_interface, "Can't create an event, something goes wrong.");
79 static int subscribe_unsubscribe_signal(struct afb_req request, bool subscribe, const std::string& sig)
83 std::lock_guard<std::mutex> subscribed_signals_lock(get_subscribed_signals_mutex());
84 std::map<std::string, struct afb_event>& s = get_subscribed_signals();
85 if (s.find(sig) != s.end() && !afb_event_is_valid(s[std::string(sig)]))
89 NOTICE(binder_interface, "Event isn't valid, it can't be unsubscribed.");
93 /* Event it isn't valid annymore, recreate it */
94 ret = create_event_handle(sig, s);
98 /* Event don't exist , so let's create it */
99 struct afb_event empty_event = {nullptr, nullptr};
100 subscribed_signals[sig] = empty_event;
101 ret = create_event_handle(sig, s);
104 /* Check whether or not the event handler has been correctly created and
105 * make the subscription/unsubscription operation is so.
109 return make_subscription_unsubscription(request, sig, s, subscribe);
113 * @fn static int subscribe_unsubscribe_signals(struct afb_req request, bool subscribe, const std::vector<CanSignal>& signals)
114 * @brief subscribe to all signals in the vector signals
116 * @param[in] afb_req request : contain original request use to subscribe or unsubscribe
117 * @param[in] subscribe boolean value used to chose between a subscription operation or an unsubscription
118 * @param[in] CanSignal vector with CanSignal to subscribe
120 * @return Number of correctly subscribed signal
122 static int subscribe_unsubscribe_signals(struct afb_req request, bool subscribe, std::vector<std::string>& signals)
126 for(auto& signal_i : signals)
128 int ret = subscribe_unsubscribe_signal(request, subscribe, signal_i);
132 DEBUG(binder_interface, "Signal: %s subscribed", signal_i.c_str());
137 static int subscribe_unsubscribe_name(struct afb_req request, bool subscribe, const char *name)
139 std::vector<std::string> sig;
142 openxc_DynamicField search_key = build_DynamicField(std::string(name));
143 sig = find_signals(search_key);
147 ret = subscribe_unsubscribe_signals(request, subscribe, sig);
148 NOTICE(binder_interface, "Subscribed correctly to %d/%d signal(s).", ret, (int)sig.size());
153 static void subscribe_unsubscribe(struct afb_req request, bool subscribe)
156 struct json_object *args, *a, *x;
158 /* makes the subscription/unsubscription */
159 args = afb_req_json(request);
160 if (args == NULL || !json_object_object_get_ex(args, "event", &a)) {
161 ok = subscribe_unsubscribe_name(request, subscribe, "*");
162 } else if (json_object_get_type(a) != json_type_array) {
163 ok = subscribe_unsubscribe_name(request, subscribe, json_object_get_string(a));
165 n = json_object_array_length(a);
167 for (i = 0 ; i < n ; i++) {
168 x = json_object_array_get_idx(a, i);
169 if (subscribe_unsubscribe_name(request, subscribe, json_object_get_string(x)))
175 /* send the report */
177 afb_req_success(request, NULL, NULL);
179 afb_req_fail(request, "error", NULL);
184 static void subscribe(struct afb_req request)
186 subscribe_unsubscribe(request, true);
189 static void unsubscribe(struct afb_req request)
191 subscribe_unsubscribe(request, false);
194 static const struct afb_verb_desc_v1 verbs[]=
196 { .name= "subscribe", .session= AFB_SESSION_NONE, .callback= subscribe, .info= "subscribe to notification of CAN bus messages." },
197 { .name= "unsubscribe", .session= AFB_SESSION_NONE, .callback= unsubscribe, .info= "unsubscribe a previous subscription." }
200 static const struct afb_binding binding_desc {
201 AFB_BINDING_VERSION_1,
203 "Low level CAN bus service",
209 const struct afb_binding *afbBindingV1Register (const struct afb_binding_interface *itf)
211 binder_interface = itf;
213 return &binding_desc;
217 * @brief Initialize the binding.
219 * @param[in] service Structure which represent the Application Framework Binder.
221 * @return Exit code, zero if success.
223 int afbBindingV1ServiceInit(struct afb_service service)
226 fd_conf = afb_daemon_rootdir_open_locale(binder_interface->daemon, "can_buses.json", O_RDONLY, NULL);
228 /* Initialize the CAN bus handler */
229 can_bus_handler = new can_bus_t(fd_conf);
231 /* Open CAN socket */
232 if(can_bus_handler->init_can_dev() == 0)
234 can_bus_handler->start_threads();
237 ERROR(binder_interface, "There was something wrong with CAN device Initialization. Check your config file maybe");