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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 <queue>
#include <mutex>
#include <vector>
#include <thread>
#include <fcntl.h>
#include <linux/can.h>
#include <json-c/json.h>
#include <systemd/sd-event.h>
#include "openxc.pb.h"
#include "can/can-bus.hpp"
#include "can/can-signals.hpp"
#include "can/can-message.hpp"
#include "utils/timer.hpp"
#include "utils/signals.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;
can_bus_t *can_bus_handler;
/********************************************************************************
*
* 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.c_str()])) < 0)
{
ERROR(binder_interface, "Operation goes wrong for signal: %s", sig_name);
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, "Can't create an event, something goes wrong.");
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() && !afb_event_is_valid(s[std::string(sig)]))
{
if(!subscribe)
{
NOTICE(binder_interface, "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 don'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<CanSignal>& 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] CanSignal vector with CanSignal 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;
for(auto& sig : signals)
{
int 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 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)
{
int fd_conf;
fd_conf = afb_daemon_rootdir_open_locale(binder_interface->daemon, "can_buses.json", O_RDONLY, NULL);
/* Initialize the CAN bus handler */
can_bus_handler = new can_bus_t(fd_conf);
/* Open CAN socket */
if(can_bus_handler->init_can_dev() == 0)
{
can_bus_handler->start_threads();
return 0;
}
ERROR(binder_interface, "There was something wrong with CAN device Initialization. Check your config file maybe");
return 1;
}
};
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