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/*
* Copyright (C) 2017 Konsulko Group
* Author: Matt Ranostay <matt.ranostay@konsulko.com>
*
* 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.
*/
#define _GNU_SOURCE
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <pthread.h>
#include <geoclue.h>
#include <glib-object.h>
#include <json-c/json.h>
#define AFB_BINDING_VERSION 3
#include <afb/afb-binding.h>
static afb_event_t location_event;
static GClueSimple *simple;
/*
* @latitude - latitude in degrees
* @longitude - longitude in degrees
* @accuracy - accuracy in meters
* @altitude - altitude in meters
*/
static json_object *populate_json(json_object *jresp, GClueLocation *location)
{
json_object *value;
double altitude = gclue_location_get_altitude(location);
value = json_object_new_double(gclue_location_get_latitude(location));
json_object_object_add(jresp, "latitude", value);
value = json_object_new_double(gclue_location_get_longitude(location));
json_object_object_add(jresp, "longitude", value);
value = json_object_new_double(gclue_location_get_accuracy(location));
json_object_object_add(jresp, "accuracy", value);
if (altitude != -G_MAXDOUBLE) {
value = json_object_new_double(altitude);
json_object_object_add(jresp, "altitude", value);
}
return jresp;
}
/*
* @heading - heading in degrees
* @speed - speed in meters per second
*/
static json_object *populate_velocity_json(json_object *jresp, GClueLocation *location)
{
json_object *value;
double heading = gclue_location_get_heading(location);
double speed = gclue_location_get_speed(location);
if (heading >= 0) {
value = json_object_new_double(heading);
json_object_object_add(jresp, "heading", value);
}
if (speed >= 0) {
value = json_object_new_double(speed);
json_object_object_add(jresp, "speed", value);
}
return jresp;
}
static void send_event(GClueSimple *simple)
{
json_object *jresp;
GClueLocation *location;
location = gclue_simple_get_location(simple);
jresp = json_object_new_object();
populate_json(jresp, location);
populate_velocity_json(jresp, location);
afb_event_push(location_event, jresp);
}
static void get_data(afb_req_t request)
{
json_object *jresp = json_object_new_object();
GClueLocation *location;
if (simple == NULL) {
afb_req_fail(request, "failed", "No GeoClue instance available");
return;
}
location = gclue_simple_get_location(simple);
populate_json(jresp, location);
afb_req_success(request, jresp, "GeoClue location data");
}
static void on_ready(GObject *source_object, GAsyncResult *res, gpointer ptr)
{
GError *error = NULL;
simple = gclue_simple_new_finish(res, &error);
if (error != NULL) {
AFB_ERROR("Failed to connect to GeoClue2 service: %s", error->message);
abort();
}
send_event(simple);
g_signal_connect(simple, "notify::location", G_CALLBACK(send_event), NULL);
}
static void *geoclue_loop_thread(void *ptr)
{
gclue_simple_new("geoclue-binding", GCLUE_ACCURACY_LEVEL_EXACT, NULL, on_ready, NULL);
g_main_loop_run(g_main_loop_new(NULL, FALSE));
return NULL;
}
static int init(afb_api_t api)
{
pthread_t thread_id;
location_event = afb_daemon_make_event("location");
return pthread_create(&thread_id, NULL, geoclue_loop_thread, NULL);
}
static void subscribe(afb_req_t request)
{
const char *value = afb_req_value(request, "value");
if (value && !strcasecmp(value, "location")) {
afb_req_subscribe(request, location_event);
afb_req_success(request, NULL, NULL);
/*
* Sent out an initial event on subsciption since if location is
* static another event may not happen.
*/
if (simple) {
send_event(simple);
}
return;
}
afb_req_fail(request, "failed", "Invalid event");
}
static void unsubscribe(afb_req_t request)
{
const char *value = afb_req_value(request, "value");
if (value && !strcasecmp(value, "location")) {
afb_req_unsubscribe(request, location_event);
afb_req_success(request, NULL, NULL);
return;
}
afb_req_fail(request, "failed", "Invalid event");
}
static const struct afb_verb_v3 binding_verbs[] = {
{ .verb = "location", .callback = get_data, .info = "Get GeoClue coordinates" },
{ .verb = "subscribe", .callback = subscribe, .info = "Subscribe to GeoClue events" },
{ .verb = "unsubscribe", .callback = unsubscribe, .info = "Unsubscribe to GeoClue events" },
{ }
};
/*
* binder API description
*/
const struct afb_binding_v3 afbBindingV3 = {
.api = "geoclue",
.specification = "GeoClue service API",
.verbs = binding_verbs,
.init = init,
};
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