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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"
/********************************************************************************
*
* Subscription and unsubscription
*
*********************************************************************************/
static int subscribe_unsubscribe_signal(struct afb_req request, const std::string& sig)
{
int ret;
// TODO: lock the subscribed_signals when insert/remove
const auto& ss_i = subscribed_signals.find(sig);
if (ss_i != subscribed_signals.end())
{
if(!afb_event_is_valid(ss_i->second))
{
if(!subscribe)
{
NOTICE(binder_interface, "Event isn't valid, it can't be unsubscribed.");
ret = 1;
}
else
{
ss_i->second = afb_daemon_make_event(binder_interface->daemon, ss_i->first.c_str());
if (!afb_event_is_valid(ss_i->second))
{
ERROR(binder_interface, "Can't create an event, something goes wrong.");
ret = 0;
}
}
}
}
else
{
subscribed_signals[sig] = afb_daemon_make_event(binder_interface->daemon, sig);
if (!afb_event_is_valid(ss_i->second))
{
ERROR(binder_interface, "Can't create an event, something goes wrong.");
ret = 0;
}
}
if (((subscribe ? afb_req_subscribe : afb_req_unsubscribe)(request, subscribed_signals[sig])) < 0)
{
ERROR(binder_interface, "Operation goes wrong for signal: %s", sig);
ret = 0;
}
else
ret = 1;
return ret;
}
static int subscribe_signals(struct afb_req request, const std::vector<std::string>& signals)
{
int ret = 0;
for(const auto& signal_i : signals)
{
ret = subscribe_signal(request, subscribe, signal_i);
if(ret == 0)
return ret;
}
return ret;
}
std::vector<std::string> get_name(struct afb_req request)
{
int i, n;
std::vector<std::string> ret;
struct json_object *args, *a, *x;
args = afb_req_json(request);
if (args == NULL || !json_object_object_get_ex(args, "event", &a))
ret.clear();
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;
}
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,
{
"CAN bus service",
"can",
verbs
}
};
extern "C"
{
static void subscribe(struct afb_req request)
{
int ret;
std::vector<std::string> names;
names = get_name(request);
if(names.empty())
ret = subscribe_signals(request, "*");
else
ret = subscribe_signals(request, names);
}
static void unsubscribe(struct afb_req request)
{
subscribe_unsubscribe(request, false);
}
const struct afb_binding *afbBindingV1Register (const struct afb_binding_interface *itf)
{
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(interface->daemon, "can_bus.json", O_RDONLY, NULL);
/* Open CAN socket */
can_bus_t can_bus_handler(interface, fd_conf);
if(can_bus_handler.init_can_dev() == 0)
{
can_bus_handler.start_threads();
return 0;
}
return 1;
}
};
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