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diff --git a/CAN-binder/low-can-binding/binding/low-can-cb.cpp b/CAN-binder/low-can-binding/binding/low-can-cb.cpp
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+/*
+ * Copyright (C) 2015, 2016 "IoT.bzh"
+ * Author "Romain Forlot" <romain.forlot@iot.bzh>
+ * Author "Loic Collignon" <loic.collignon@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "low-can-hat.hpp"
+
+#include <map>
+#include <queue>
+#include <mutex>
+#include <vector>
+#include <thread>
+#include <json-c/json.h>
+#include <systemd/sd-event.h>
+
+#include "openxc.pb.h"
+#include "configuration.hpp"
+#include "../can/can-bus.hpp"
+#include "../can/can-signals.hpp"
+#include "../can/can-message.hpp"
+#include "../utils/timer.hpp"
+#include "../utils/signals.hpp"
+#include "../diagnostic/diagnostic-message.hpp"
+#include "../utils/openxc-utils.hpp"
+
+extern "C"
+{
+ #include <afb/afb-service-itf.h>
+};
+
+void on_no_clients(std::string message)
+{
+ DiagnosticRequest* diag_req = configuration_t::instance().get_request_from_diagnostic_message(message);
+ if(diag_req != nullptr)
+ {
+ active_diagnostic_request_t* adr = configuration_t::instance().get_diagnostic_manager().find_recurring_request(diag_req);
+ if( adr != nullptr)
+ configuration_t::instance().get_diagnostic_manager().cleanup_request(adr, true);
+ }
+}
+
+int read(sd_event_source *s, int fd, uint32_t revents, void *userdata)
+{
+ can_signal_t* sig= (can_signal_t*)userdata;
+ if(sig->read_socket() != can_message_format_t::ERROR)
+ return 0;
+ return -1;
+}
+
+///******************************************************************************
+///
+/// Subscription and unsubscription
+///
+///*******************************************************************************/
+
+static int make_subscription_unsubscription(struct afb_req request, const std::string& sig_name, std::map<std::string, struct afb_event>& s, bool subscribe)
+{
+ /* Make the subscription or unsubscription to the event */
+ if (((subscribe ? afb_req_subscribe : afb_req_unsubscribe)(request, s[sig_name])) < 0)
+ {
+ ERROR(binder_interface, "%s: Operation goes wrong for signal: %s", __FUNCTION__, sig_name.c_str());
+ return 0;
+ }
+ return 1;
+}
+
+static int create_event_handle(const std::string& sig_name, std::map<std::string, struct afb_event>& s)
+{
+ s[sig_name] = afb_daemon_make_event(binder_interface->daemon, sig_name.c_str());
+ if (!afb_event_is_valid(s[sig_name]))
+ {
+ ERROR(binder_interface, "%s: Can't create an event for %s, something goes wrong.", __FUNCTION__, sig_name.c_str());
+ return 0;
+ }
+ return 1;
+}
+
+/// @brief Will determine if it is needed or not to create the event handle and checks it to be sure that
+/// we got a valid afb_event to get subscribe or unsubscribe. Then launch the subscription or unsubscription
+/// against the application framework using that event handle.
+static int subscribe_unsubscribe_signal(struct afb_req request, bool subscribe, const std::string& sig)
+{
+ int ret;
+
+ utils::signals_manager_t& sm = utils::signals_manager_t::instance();
+
+ std::lock_guard<std::mutex> subscribed_signals_lock(sm.get_subscribed_signals_mutex());
+ std::map<std::string, struct afb_event>& s = sm.get_subscribed_signals();
+ if (s.find(sig) != s.end())
+ {
+ if (!afb_event_is_valid(s[sig]) && !subscribe)
+ {
+ NOTICE(binder_interface, "%s: Event isn't valid, no need to unsubscribed.", __FUNCTION__);
+ ret = -1;
+ }
+ else
+ {
+ // Event it isn't valid annymore, recreate it
+ ret = create_event_handle(sig, s);
+ }
+ }
+ else
+ {
+ /* Event doesn't exist , so let's create it */
+ struct afb_event empty_event = {nullptr, nullptr};
+ s[sig] = empty_event;
+ ret = create_event_handle(sig, s);
+ }
+
+ // Check whether or not the event handler has been correctly created and
+ // make the subscription/unsubscription operation is so.
+ if (ret <= 0)
+ return ret;
+ return make_subscription_unsubscription(request, sig, s, subscribe);
+}
+
+///
+/// @brief subscribe to all signals in the vector signals
+///
+/// @param[in] afb_req request : contain original request use to subscribe or unsubscribe
+/// @param[in] subscribe boolean value used to chose between a subscription operation or an unsubscription
+/// @param[in] signals - struct containing vectors with can_signal_t and diagnostic_messages to subscribe
+///
+/// @return Number of correctly subscribed signal
+///
+static int subscribe_unsubscribe_signals(struct afb_req request, bool subscribe, const struct utils::signals_found& signals)
+{
+ int ret, rets = 0;
+
+ //TODO: Implement way to dynamically call the right function no matter
+ // how much signals types we have.
+ configuration_t& conf = configuration_t::instance();
+
+ for(const auto& sig : signals.diagnostic_messages)
+ {
+ diagnostic_manager_t& diag_m = conf.get_diagnostic_manager();
+ DiagnosticRequest* diag_req = conf.get_request_from_diagnostic_message(sig->get_name());
+
+ // If the requested diagnostic message isn't supported by the car then unsubcribe it
+ // no matter what we want, worse case will be a fail unsubscription but at least we don't
+ // poll a PID for nothing.
+ if(sig->get_supported() && subscribe)
+ {
+ float frequency = sig->get_frequency();
+ subscribe = diag_m.add_recurring_request(
+ diag_req, sig->get_name().c_str(), false, sig->get_decoder(), sig->get_callback(), (float)frequency);
+ //TODO: Adding callback requesting ignition status: diag_req, sig.c_str(), false, diagnostic_message_t::decode_obd2_response, diagnostic_message_t::check_ignition_status, frequency);
+ }
+ else
+ {
+ diag_m.cleanup_request(
+ diag_m.find_recurring_request(diag_req), true);
+ WARNING(binder_interface, "%s: signal: %s isn't supported. Canceling operation.", __FUNCTION__, sig->get_name().c_str());
+ return -1;
+ }
+
+ ret = subscribe_unsubscribe_signal(request, subscribe, sig->get_name());
+ if(ret <= 0)
+ return ret;
+ rets++;
+ DEBUG(binder_interface, "%s: Signal: %s subscribed", __FUNCTION__, sig->get_name().c_str());
+ }
+
+ for(const auto& sig: signals.can_signals)
+ {
+ if(sig->create_rx_filter() <= 0 &&
+ subscribe_unsubscribe_signal(request, subscribe, sig->get_name()) <=0)
+ {
+ return -1;
+ }
+ struct sd_event_source* e_source;
+ sd_event_add_io(afb_daemon_get_event_loop(binder_interface->daemon), &e_source, sig->get_socket().socket(), EPOLLIN, read, sig);
+ rets++;
+ DEBUG(binder_interface, "%s: signal: %s subscribed", __FUNCTION__, sig->get_name().c_str());
+ }
+ return rets;
+}
+
+static const std::vector<std::string> parse_args_from_request(struct afb_req request, bool subscribe)
+{
+ int i, n;
+ std::vector<std::string> ret;
+ struct json_object *args, *a, *x;
+
+ /* retrieve signals to subscribe */
+ args = afb_req_json(request);
+ if (args == NULL || !json_object_object_get_ex(args, "event", &a))
+ {
+ ret.push_back("*");
+ }
+ else if (json_object_get_type(a) != json_type_array)
+ {
+ ret.push_back(json_object_get_string(a));
+ }
+ else
+ {
+ n = json_object_array_length(a);
+ for (i = 0 ; i < n ; i++)
+ {
+ x = json_object_array_get_idx(a, i);
+ ret.push_back(json_object_get_string(x));
+ }
+ }
+
+ return ret;
+}
+
+void subscribe(struct afb_req request)
+{
+ std::vector<std::string> args;
+ struct utils::signals_found sf;
+ int ok = 0, total = 0;
+ bool subscribe = true;
+
+ args = parse_args_from_request(request, subscribe);
+
+ for(const auto& sig: args)
+ {
+ openxc_DynamicField search_key = build_DynamicField(sig);
+ sf = utils::signals_manager_t::instance().find_signals(search_key);
+ total = (int)sf.can_signals.size() + (int)sf.diagnostic_messages.size();
+
+ if (sf.can_signals.empty() && sf.diagnostic_messages.empty())
+ NOTICE(binder_interface, "%s: No signal(s) found for %s.", __FUNCTION__, sig.c_str());
+ else
+ ok = subscribe_unsubscribe_signals(request, subscribe, sf);
+ }
+
+ NOTICE(binder_interface, "%s: Subscribed/unsubscribe correctly to %d/%d signal(s).", __FUNCTION__, ok, total);
+ if (ok > 0)
+ afb_req_success(request, NULL, NULL);
+ else
+ afb_req_fail(request, "error", NULL);
+}
+
+ void unsubscribe(struct afb_req request)
+{
+ parse_args_from_request(request, false);
+} \ No newline at end of file