Separation Generator to a dedicated repo

Change-Id: Id94831651c3266861435272a6e36c7884bef2c45
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>

1 files changed, 358 insertions, 0 deletions

diff --git a/low-can-binding/binding/low-can-cb.cpp b/low-can-binding/binding/low-can-cb.cpp
new file mode 100644
index 0000000..97b6d20
--- /dev/null
+++ b/low-can-binding/binding/low-can-cb.cpp
@@ -0,0 +1,358 @@
+/*
+ * 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 "application.hpp"
+#include "../can/can-bus.hpp"
+#include "../can/can-signals.hpp"
+#include "../can/can-message.hpp"
+#include "../utils/signals.hpp"
+#include "../diagnostic/diagnostic-message.hpp"
+#include "../utils/openxc-utils.hpp"
+
+
+///******************************************************************************
+///
+///		SystemD event loop Callbacks
+///
+///*******************************************************************************/
+
+void on_no_clients(std::shared_ptr<low_can_subscription_t> can_subscription, uint32_t pid, std::map<int, std::shared_ptr<low_can_subscription_t> >& s)
+{
+	if( ! can_subscription->get_diagnostic_message().empty() && can_subscription->get_diagnostic_message(pid) != nullptr)
+	{
+		DiagnosticRequest diag_req = can_subscription->get_diagnostic_message(pid)->build_diagnostic_request();
+		active_diagnostic_request_t* adr = application_t::instance().get_diagnostic_manager().find_recurring_request(diag_req);
+		if( adr != nullptr)
+			application_t::instance().get_diagnostic_manager().cleanup_request(adr, true);
+	}
+
+	on_no_clients(can_subscription, s);
+}
+
+void on_no_clients(std::shared_ptr<low_can_subscription_t> can_subscription, std::map<int, std::shared_ptr<low_can_subscription_t> >& s)
+{
+	auto it = s.find(can_subscription->get_index());
+	s.erase(it);
+}
+
+static void push_n_notify(const can_message_t& cm)
+{
+	can_bus_t& cbm = application_t::instance().get_can_bus_manager();
+	{
+		std::lock_guard<std::mutex> can_message_lock(cbm.get_can_message_mutex());
+	 	cbm.push_new_can_message(cm);
+	}
+	cbm.get_new_can_message_cv().notify_one();
+}
+
+int read_message(sd_event_source *event_source, int fd, uint32_t revents, void *userdata)
+{
+	low_can_subscription_t* can_subscription = (low_can_subscription_t*)userdata;
+	if ((revents & EPOLLIN) != 0)
+	{
+		can_message_t cm;
+		utils::socketcan_bcm_t& s = can_subscription->get_socket();
+		s >> cm;
+
+		// Sure we got a valid CAN message ?
+		if(! cm.get_id() == 0 && ! cm.get_length() == 0)
+			{push_n_notify(cm);}
+	}
+
+	// check if error or hangup
+	if ((revents & (EPOLLERR|EPOLLRDHUP|EPOLLHUP)) != 0)
+	{
+		sd_event_source_unref(event_source);
+		can_subscription->get_socket().close();
+	}
+	return 0;
+}
+
+///******************************************************************************
+///
+///		Subscription and unsubscription
+///
+///*******************************************************************************/
+
+static int make_subscription_unsubscription(struct afb_req request, std::shared_ptr<low_can_subscription_t>& can_subscription, std::map<int, std::shared_ptr<low_can_subscription_t> >& s, bool subscribe)
+{
+	/* Make the subscription or unsubscription to the event */
+	if (((subscribe ? afb_req_subscribe : afb_req_unsubscribe)(request, s[can_subscription->get_index()]->get_event())) < 0)
+	{
+		ERROR("Operation goes wrong for signal: %s", can_subscription->get_name().c_str());
+		return -1;
+	}
+	return 0;
+}
+
+static int create_event_handle(std::shared_ptr<low_can_subscription_t>& can_subscription, std::map<int, std::shared_ptr<low_can_subscription_t> >& s)
+{
+	int sub_index = can_subscription->get_index();
+	can_subscription->set_event(afb_daemon_make_event(can_subscription->get_name().c_str()));
+	s[sub_index] = can_subscription;
+	if (!afb_event_is_valid(s[sub_index]->get_event()))
+	{
+		ERROR("Can't create an event for %s, something goes wrong.", can_subscription->get_name().c_str());
+		return -1;
+	}
+	return 0;
+}
+
+/// @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, std::shared_ptr<low_can_subscription_t>& can_subscription, std::map<int, std::shared_ptr<low_can_subscription_t> >& s)
+{
+	int ret = -1;
+	int sub_index = can_subscription->get_index();
+
+	if (can_subscription && s.find(sub_index) != s.end())
+	{
+		if (!afb_event_is_valid(s[sub_index]->get_event()) && !subscribe)
+		{
+			NOTICE("Event isn't valid, no need to unsubscribed.");
+			ret = -1;
+		}
+		ret = 0;
+	}
+	else
+	{
+		/* Event doesn't exist , so let's create it */
+		can_subscription->set_event({nullptr, nullptr});
+		s[sub_index] = can_subscription;
+		ret = create_event_handle(can_subscription, 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, can_subscription, s, subscribe);
+}
+
+static int add_to_event_loop(std::shared_ptr<low_can_subscription_t>& can_subscription)
+{
+		struct sd_event_source* event_source = nullptr;
+		return ( sd_event_add_io(afb_daemon_get_event_loop(),
+			&event_source,
+			can_subscription->get_socket().socket(),
+			EPOLLIN,
+			read_message,
+			can_subscription.get()));
+}
+
+static int subscribe_unsubscribe_diagnostic_messages(struct afb_req request, bool subscribe, std::vector<std::shared_ptr<diagnostic_message_t> > diagnostic_messages, struct event_filter_t& event_filter, std::map<int, std::shared_ptr<low_can_subscription_t> >& s)
+{
+	int rets = 0;
+	application_t& app = application_t::instance();
+	diagnostic_manager_t& diag_m = app.get_diagnostic_manager();
+
+	for(const auto& sig : diagnostic_messages)
+	{
+		DiagnosticRequest* diag_req = new DiagnosticRequest(sig->build_diagnostic_request());
+		event_filter.frequency = std::isnan(event_filter.frequency) ? sig->get_frequency() : event_filter.frequency;
+		std::shared_ptr<low_can_subscription_t> can_subscription;
+
+		auto it =  std::find_if(s.begin(), s.end(), [&sig](std::pair<int, std::shared_ptr<low_can_subscription_t> > sub){ return (! sub.second->get_diagnostic_message().empty());});
+		can_subscription = it != s.end() ?
+			it->second : 
+			std::make_shared<low_can_subscription_t>(low_can_subscription_t(event_filter));
+		// 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.
+		//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);
+		if(sig->get_supported() && subscribe)
+		{
+			diag_m.add_recurring_request(diag_req, sig->get_name().c_str(), false, sig->get_decoder(), sig->get_callback(), event_filter.frequency);
+			if(can_subscription->create_rx_filter(sig) < 0)
+				{return -1;}
+			DEBUG("Signal: %s subscribed", sig->get_name().c_str());
+			if(it == s.end() && add_to_event_loop(can_subscription) < 0)
+			{
+				diag_m.cleanup_request(
+					diag_m.find_recurring_request(*diag_req), true);
+				WARNING("signal: %s isn't supported. Canceling operation.",  sig->get_name().c_str());
+				return -1;
+			}
+		}
+		else
+		{
+			if(sig->get_supported())
+			{DEBUG("%s cancelled due to unsubscribe", sig->get_name().c_str());}
+			else
+			{
+				WARNING("signal: %s isn't supported. Canceling operation.", sig->get_name().c_str());
+				return -1;
+			}
+		}
+		int ret = subscribe_unsubscribe_signal(request, subscribe, can_subscription, s);
+		if(ret < 0)
+			return ret;
+
+		rets++;
+	}
+
+	return rets;
+}
+
+static int subscribe_unsubscribe_can_signals(struct afb_req request, bool subscribe, std::vector<std::shared_ptr<can_signal_t> > can_signals, struct event_filter_t& event_filter, std::map<int, std::shared_ptr<low_can_subscription_t> >& s)
+{
+	int rets = 0;
+	for(const auto& sig: can_signals)
+	{
+		auto it =  std::find_if(s.begin(), s.end(), [&sig](std::pair<int, std::shared_ptr<low_can_subscription_t> > sub){ return sub.second->get_can_signal() == sig; });
+		std::shared_ptr<low_can_subscription_t> can_subscription;
+		if(it != s.end())
+		{
+			 can_subscription = it->second;
+		}
+		else
+		{
+			 can_subscription = std::make_shared<low_can_subscription_t>(low_can_subscription_t(event_filter));
+			if(can_subscription->create_rx_filter(sig) < 0)
+				{return -1;}
+			if(add_to_event_loop(can_subscription) < 0)
+				{return -1;}
+		}
+
+		if(subscribe_unsubscribe_signal(request, subscribe, can_subscription, s) < 0)
+			{return -1;}
+
+		rets++;
+		DEBUG("signal: %s subscribed", sig->get_name().c_str());
+	}
+	return rets;
+}
+
+///
+/// @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, struct event_filter_t& event_filter)
+{
+	int rets = 0;
+	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<int, std::shared_ptr<low_can_subscription_t> >& s = sm.get_subscribed_signals();
+
+	rets += subscribe_unsubscribe_diagnostic_messages(request, subscribe, signals.diagnostic_messages, event_filter, s);
+	rets += subscribe_unsubscribe_can_signals(request, subscribe, signals.can_signals, event_filter, s);
+
+	return rets;
+}
+
+static int one_subscribe_unsubscribe(struct afb_req request, bool subscribe, const std::string& tag, json_object* args)
+{
+	int ret = 0;
+	struct event_filter_t event_filter;
+	struct json_object  *filter, *obj;
+	struct utils::signals_found sf;
+
+	// computes the filter
+	if (json_object_object_get_ex(args, "filter", &filter))
+	{
+		if (json_object_object_get_ex(filter, "frequency", &obj)
+		&& (json_object_is_type(obj, json_type_double) || json_object_is_type(obj, json_type_int)))
+		{
+			event_filter.frequency = (float)json_object_get_double(obj);
+			ret += 1;
+		}
+		if (json_object_object_get_ex(filter, "min", &obj)
+		&& (json_object_is_type(obj, json_type_double) || json_object_is_type(obj, json_type_int)))
+		{
+			event_filter.min = (float)json_object_get_double(obj);
+			ret += 2;
+		}
+		if (json_object_object_get_ex(filter, "max", &obj)
+		&& (json_object_is_type(obj, json_type_double) || json_object_is_type(obj, json_type_int)))
+		{
+			event_filter.max = (float)json_object_get_double(obj);
+			ret += 4;
+		}
+	}
+
+	// subscribe or unsubscribe
+	openxc_DynamicField search_key = build_DynamicField(tag);
+	sf = utils::signals_manager_t::instance().find_signals(search_key);
+	if (sf.can_signals.empty() && sf.diagnostic_messages.empty())
+		NOTICE("No signal(s) found for %s.", tag.c_str());
+	else
+		ret = subscribe_unsubscribe_signals(request, subscribe, sf, event_filter);
+
+	return ret;
+}
+
+static void do_subscribe_unsubscribe(struct afb_req request, bool subscribe)
+{
+	int i, n, rc, rc2;
+	struct json_object *args, *event, *x;
+
+	args = afb_req_json(request);
+	if (args == NULL || !json_object_object_get_ex(args, "event", &event))
+	{
+		rc = one_subscribe_unsubscribe(request, subscribe, "*", args);
+	}
+	else if (json_object_get_type(event) != json_type_array)
+	{
+		rc = one_subscribe_unsubscribe(request, subscribe, json_object_get_string(event), args);
+	}
+	else
+	{
+		rc = 0;
+		n = json_object_array_length(event);
+		for (i = 0 ; i < n ; i++)
+		{
+			x = json_object_array_get_idx(event, i);
+			rc2 = one_subscribe_unsubscribe(request, subscribe, json_object_get_string(x), args);
+			if (rc >= 0)
+				rc = rc2 >= 0 ? rc + rc2 : rc2;
+		}
+	}
+
+	if (rc >= 0)
+		afb_req_success(request, NULL, NULL);
+	else
+		afb_req_fail(request, "error", NULL);
+}
+
+void subscribe(struct afb_req request)
+{
+	do_subscribe_unsubscribe(request, true);
+}
+
+void unsubscribe(struct afb_req request)
+{
+	do_subscribe_unsubscribe(request, false);
+}