1 files changed, 279 insertions, 0 deletions
diff --git a/low-can-binding/low-can-binding.cpp b/low-can-binding/low-can-binding.cpp
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+++ b/low-can-binding/low-can-binding.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-binding.hpp"
+
+#include <map>
+#include <queue>
+#include <mutex>
+#include <vector>
+#include <thread>
+#include <time.h>
+#include <linux/can.h>
+#include <json-c/json.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>
+};
+
+// Interface between the daemon and the binding
+const struct afb_binding_interface *binder_interface;
+
+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);
+	}
+}
+
+///******************************************************************************
+///
+///		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, "make_subscription_unsubscription: Operation goes wrong for signal: %s", 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, "create_event_handle: Can't create an event for %s, something goes wrong.", sig_name.c_str());
+		return 0;
+	}
+	return 1;
+}
+
+static int subscribe_unsubscribe_signal(struct afb_req request, bool subscribe, const std::string& sig)
+{
+	int ret;
+
+	std::lock_guard<std::mutex> subscribed_signals_lock(get_subscribed_signals_mutex());
+	std::map<std::string, struct afb_event>& s = get_subscribed_signals();
+	if (s.find(sig) != s.end())
+	{
+		if (!afb_event_is_valid(s[sig]) && !subscribe)
+		{
+			NOTICE(binder_interface, "subscribe_unsubscribe_signal: Event isn't valid, it can't be unsubscribed.");
+			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};
+		subscribed_signals[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);
+}
+
+///
+/// @fn static int subscribe_unsubscribe_signals(struct afb_req request, bool subscribe, const std::vector<can_signal_t>& signals)
+/// @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] can_signal_t  vector with can_signal_t to subscribe
+///
+/// @return Number of correctly subscribed signal
+///
+static int subscribe_unsubscribe_signals(struct afb_req request, bool subscribe, const std::vector<std::string>& signals)
+{
+	int rets = 0;
+
+	//TODO: Implement way to dynamically call the right function no matter
+	// how much signals types we have.
+
+	for(const std::string& sig : signals)
+	{
+		int ret;
+		if (active_diagnostic_request_t::is_diagnostic_signal(sig))
+		{
+			diagnostic_message_t* diag_msg = configuration_t::instance().get_diagnostic_message(sig);
+			DiagnosticRequest* diag_req = configuration_t::instance().get_request_from_diagnostic_message(diag_msg);
+
+			// If the requested diagnostic message isn't supported by the car then unssubcribe.
+			// no matter what we want, worse case will be a fail unsubscription but at least we don't
+			// poll a PID for nothing.
+			if(diag_msg->get_supported() && subscribe)
+			{
+					float frequency = diag_msg->get_frequency();
+					subscribe = configuration_t::instance().get_diagnostic_manager().add_recurring_request(
+						diag_req, sig.c_str(), false, diag_msg->get_decoder(), diag_msg->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
+			{
+				configuration_t::instance().get_diagnostic_manager().cleanup_request(
+					configuration_t::instance().get_diagnostic_manager().find_recurring_request(diag_req), true);
+				WARNING(binder_interface, "Signal: %s isn't supported. Canceling operation.", sig.c_str());
+				return -1;
+			}
+		}
+
+		ret = subscribe_unsubscribe_signal(request, subscribe, sig);
+		if(ret <= 0)
+			return ret;
+		rets++;
+
+		DEBUG(binder_interface, "Signal: %s subscribed", sig.c_str());
+	}
+	return rets;
+}
+
+static int subscribe_unsubscribe_name(struct afb_req request, bool subscribe, const char *name)
+{
+	std::vector<std::string> signals;
+	int ret = 0;
+
+	openxc_DynamicField search_key = build_DynamicField(std::string(name));
+	signals = find_signals(search_key);
+	if (signals.empty())
+		ret = 0;
+
+	ret = subscribe_unsubscribe_signals(request, subscribe, signals);
+	NOTICE(binder_interface, "Subscribed/unsubscribe correctly to %d/%d signal(s).", ret, (int)signals.size());
+
+	return ret;
+}
+
+static void subscribe_unsubscribe(struct afb_req request, bool subscribe)
+{
+	int ok, i, n;
+	struct json_object *args, *a, *x;
+
+	/* makes the subscription/unsubscription */
+	args = afb_req_json(request);
+	if (args == NULL || !json_object_object_get_ex(args, "event", &a)) {
+		ok = subscribe_unsubscribe_name(request, subscribe, "*");
+	} else if (json_object_get_type(a) != json_type_array) {
+		ok = subscribe_unsubscribe_name(request, subscribe, json_object_get_string(a));
+	} else {
+		n = json_object_array_length(a);
+		ok = 0;
+		for (i = 0 ; i < n ; i++) {
+			x = json_object_array_get_idx(a, i);
+			if (subscribe_unsubscribe_name(request, subscribe, json_object_get_string(x)))
+				ok++;
+		}
+		ok = (ok == n);
+	}
+
+	/* send the report */
+	if (ok)
+		afb_req_success(request, NULL, NULL);
+	else
+		afb_req_fail(request, "error", NULL);
+}
+
+extern "C"
+{
+	static void subscribe(struct afb_req request)
+	{
+		subscribe_unsubscribe(request, true);
+	}
+
+	static void unsubscribe(struct afb_req request)
+	{
+		subscribe_unsubscribe(request, false);
+	}
+
+	static const struct afb_verb_desc_v1 verbs[]=
+	{
+		{ .name= "subscribe",	.session= AFB_SESSION_NONE, .callback= subscribe,	.info= "subscribe to notification of CAN bus messages." },
+		{ .name= "unsubscribe",	.session= AFB_SESSION_NONE, .callback= unsubscribe,	.info= "unsubscribe a previous subscription." }
+	};
+
+	static const struct afb_binding binding_desc {
+		AFB_BINDING_VERSION_1,
+		{
+			"Low level CAN bus service",
+			"low-can",
+			verbs
+		}
+	};
+
+	const struct afb_binding *afbBindingV1Register (const struct afb_binding_interface *itf)
+	{
+		binder_interface = itf;
+
+		return &binding_desc;
+	}
+
+	/// @brief Initialize the binding.
+	///
+	/// @param[in] service Structure which represent the Application Framework Binder.
+	///
+	/// @return Exit code, zero if success.
+	int afbBindingV1ServiceInit(struct afb_service service)
+	{
+		can_bus_t& can_bus_manager = configuration_t::instance().get_can_bus_manager();
+
+		/// Initialize CAN socket
+		if(can_bus_manager.init_can_dev() == 0)
+		{
+			can_bus_manager.start_threads();
+
+			/// Initialize Diagnostic manager that will handle obd2 requests.
+			/// We pass by default the first CAN bus device to its Initialization.
+			/// TODO: be able to choose the CAN bus device that will be use as Diagnostic bus.
+			if(configuration_t::instance().get_diagnostic_manager().initialize())
+				return 0;
+		}
+
+		ERROR(binder_interface, "There was something wrong with CAN device Initialization. Check your config file maybe");
+		return 1;
+	}
+};