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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 <json-c/json.h>
#include <systemd/sd-event.h>
#include "low-can-binding.hpp"
#include "can-utils.hpp"
#include "can-signals.hpp"
#include "openxc-utils.hpp"
extern "C"
{
#include <afb/afb-binding.h>
#include <afb/afb-service-itf.h>
};
/*
* Interface between the daemon and the binding
*/
const struct afb_binding_interface *binder_interface;
/********************************************************************************
*
* Event management
*
*********************************************************************************/
/********************************************************************************
*
* Subscription and unsubscription
*
*********************************************************************************/
static int subscribe_unsubscribe_signal(struct afb_req request, bool subscribe, const CanSignal& sig)
{
int ret;
// TODO: lock the subscribed_signals when insert/remove
const auto& ss_i = subscribed_signals.find(sig.genericName);
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.genericName] = afb_daemon_make_event(binder_interface->daemon, sig.genericName);
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.genericName])) < 0)
{
ERROR(binder_interface, "Operation goes wrong for signal: %s", sig.genericName);
ret = 0;
}
else
ret = 1;
return ret;
}
static int subscribe_unsubscribe_signals(struct afb_req request, bool subscribe, const std::vector<CanSignal>& signals)
{
int ret = 0;
for(const auto& signal_i : signals)
{
ret = subscribe_unsubscribe_signal(request, subscribe, signal_i);
if(ret == 0)
return ret;
}
return ret;
}
static int subscribe_unsubscribe_all(struct afb_req request, bool subscribe)
{
int e = 0;
//for (const auto& sig : SIGNALS)
// e += !subscribe_unsubscribe_signals(request, subscribe, sig);
e += !subscribe_unsubscribe_signals(request, subscribe, getSignals());
return e == 0;
}
static int subscribe_unsubscribe_name(struct afb_req request, bool subscribe, const char *name)
{
std::vector<CanSignal> sig;
int ret = 0;
if (!::strcmp(name, "*"))
ret = subscribe_unsubscribe_all(request, subscribe);
else
{
//if(obd2_handler_c.is_obd2_signal(name))
if(false)
{
// TODO
}
else
{
openxc_DynamicField search_key = build_DynamicField(name);
sig = find_can_signals(search_key);
if (sig.empty())
ret = 0;
}
ret = subscribe_unsubscribe_signals(request, subscribe, sig);
}
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_all(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,
{
"CAN bus service",
"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_bus.json", O_RDONLY, NULL);
/* Open CAN socket */
can_bus_t can_bus_handler(fd_conf);
if(can_bus_handler.init_can_dev() == 0)
{
can_bus_handler.start_threads();
return 0;
}
return 1;
}
};
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