path: root/bindings/189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279

/*
 * Copyright (C) 2015, 2016 "IoT.bzh"
 * Author "Fulup Ar Foll"
 *
 * 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 <stdio.h>
#include <string.h>
#include <json-c/json.h>

#include <afb/afb-binding.h>

const struct afb_binding_interface *interface;

struct event
{
	struct event *next;
	struct afb_event event;
	char tag[1];
};

static struct event *events = 0;

/* searchs the event of tag */
static struct event *event_get(const char *tag)
{
	struct event *e = events;
	while(e && strcmp(e->tag, tag))
		e = e->next;
	return e;
}

/* deletes the event of tag */
static int event_del(const char *tag)
{
	struct event *e, **p;

	/* check exists */
	e = event_get(tag);
	if (!e) return -1;

	/* unlink */
	p = &events;
	while(*p != e) p = &(*p)->next;
	*p = e->next;

	/* destroys */
	afb_event_drop(e->event);
	free(e);
	return 0;
}

/* creates the event of tag */
static int event_add(const char *tag, const char *name)
{
	struct event *e;

	/* check valid tag */
	e = event_get(tag);
	if (e) return -1;

	/* creation */
	e = malloc(strlen(tag) + sizeof *e);
	if (!e) return -1;
	strcpy(e->tag, tag);

	/* make the event */
	e->event = afb_daemon_make_event(interface->daemon, name);
	if (!e->event.closure) { free(e); return -1; }

	/* link */
	e->next = events;
	events = e;
	return 0;
}

static int event_subscribe(struct afb_req request, const char *tag)
{
	struct event *e;
	e = event_get(tag);
	return e ? afb_req_subscribe(request, e->event) : -1;
}

static int event_unsubscribe(struct afb_req request, const char *tag)
{
	struct event *e;
	e = event_get(tag);
	return e ? afb_req_unsubscribe(request, e->event) : -1;
}

static int event_push(struct json_object *args, const char *tag)
{
	struct event *e;
	e = event_get(tag);
	return e ? afb_event_push(e->event, json_object_get(args)) : -1;
}

// Sample Generic Ping Debug API
static void ping(struct afb_req request, json_object *jresp, const char *tag)
{
	static int pingcount = 0;
	json_object *query = afb_req_json(request);
	afb_req_success_f(request, jresp, "Ping Binder Daemon tag=%s count=%d query=%s", tag, ++pingcount, json_object_to_json_string(query));
}

static void pingSample (struct afb_req request)
{
	ping(request, json_object_new_string ("Some String"), "pingSample");
}

static void pingFail (struct afb_req request)
{
	afb_req_fail(request, "failed", "Ping Binder Daemon fails");
}

static void pingNull (struct afb_req request)
{
	ping(request, NULL, "pingNull");
}

static void pingBug (struct afb_req request)
{
	ping((struct afb_req){NULL,NULL,NULL}, NULL, "pingBug");
}

static void pingEvent(struct afb_req request)
{
	json_object *query = afb_req_json(request);
	afb_daemon_broadcast_event(interface->daemon, "event", json_object_get(query));
	ping(request, json_object_get(query), "event");
}


// For samples https://linuxprograms.wordpress.com/2010/05/20/json-c-libjson-tutorial/
static void pingJson (struct afb_req request) {
    json_object *jresp, *embed;

    jresp = json_object_new_object();
    json_object_object_add(jresp, "myString", json_object_new_string ("Some String"));
    json_object_object_add(jresp, "myInt", json_object_new_int (1234));

    embed  = json_object_new_object();
    json_object_object_add(embed, "subObjString", json_object_new_string ("Some String"));
    json_object_object_add(embed, "subObjInt", json_object_new_int (5678));

    json_object_object_add(jresp,"eobj", embed);

    ping(request, jresp, "pingJson");
}

static void subcallcb (void *prequest, int iserror, json_object *object)
{
	struct afb_req request = afb_req_unstore(prequest);
	if (iserror)
		afb_req_fail(request, "failed", json_object_to_json_string(object));
	else
		afb_req_success(request, object, NULL);
	afb_req_unref(request);
}

static void subcall (struct afb_req request)
{
	const char *api = afb_req_value(request, "api");
	const char *verb = afb_req_value(request, "verb");
	const char *args = afb_req_value(request, "args");
	json_object *object = api && verb && args ? json_tokener_parse(args) : NULL;

	if (object == NULL)
		afb_req_fail(request, "failed", "bad arguments");
	else
		afb_req_subcall(request, api, verb, object, subcallcb, afb_req_store(request));
}

static void eventadd (struct afb_req request)
{
	const char *tag = afb_req_value(request, "tag");
	const char *name = afb_req_value(request, "name");

	if (tag == NULL || name == NULL)
		afb_req_fail(request, "failed", "bad arguments");
	else if (0 != event_add(tag, name))
		afb_req_fail(request, "failed", "creation error");
	else
		afb_req_success(request, NULL, NULL);
}

static void eventdel (struct afb_req request)
{
	const char *tag = afb_req_value(request, "tag");

	if (tag == NULL)
		afb_req_fail(request, "failed", "bad arguments");
	else if (0 != event_del(tag))
		afb_req_fail(request, "failed", "deletion error");
	else
		afb_req_success(request, NULL, NULL);
}

static void eventsub (struct afb_req request)
{
	const char *tag = afb_req_value(request, "tag");

	if (tag == NULL)
		afb_req_fail(request, "failed", "bad arguments");
	else if (0 != event_subscribe(request, tag))
		afb_req_fail(request, "failed", "subscription error");
	else
		afb_req_success(request, NULL, NULL);
}

static void eventunsub (struct afb_req request)
{
	const char *tag = afb_req_value(request, "tag");

	if (tag == NULL)
		afb_req_fail(request, "failed", "bad arguments");
	else if (0 != event_unsubscribe(request, tag))
		afb_req_fail(request, "failed", "unsubscription error");
	else
		afb_req_success(request, NULL, NULL);
}

static void eventpush (struct afb_req request)
{
	const char *tag = afb_req_value(request, "tag");
	const char *data = afb_req_value(request, "data");
	json_object *object = data ? json_tokener_parse(data) : NULL;

	if (tag == NULL)
		afb_req_fail(request, "failed", "bad arguments");
	else if (0 > event_push(object, tag))
		afb_req_fail(request, "failed", "push error");
	else
		afb_req_success(request, NULL, NULL);
}

// NOTE: this sample does not use session to keep test a basic as possible
//       in real application most APIs should be protected with AFB_SESSION_CHECK
static const struct afb_verb_desc_v1 verbs[]= {
  {"ping"     , AFB_SESSION_NONE, pingSample  , "Ping Application Framework"},
  {"pingfail" , AFB_SESSION_NONE, pingFail    , "Fails"},
  {"pingnull" , AFB_SESSION_NONE, pingNull    , "Return NULL"},
  {"pingbug"  , AFB_SESSION_NONE, pingBug     , "Do a Memory Violation"},
  {"pingJson" , AFB_SESSION_NONE, pingJson    , "Return a JSON object"},
  {"pingevent", AFB_SESSION_NONE, pingEvent   , "Send an event"},
  {"subcall",   AFB_SESSION_NONE, subcall     , "Call api/verb(args)"},
  {"eventadd",  AFB_SESSION_NONE, eventadd    , "adds the event of 'name' for the 'tag'"},
  {"eventdel",  AFB_SESSION_NONE, eventdel    , "deletes the event of 'tag'"},
  {"eventsub",  AFB_SESSION_NONE, eventsub    , "subscribes to the event of 'tag'"},
  {"eventunsub",AFB_SESSION_NONE, eventunsub  , "unsubscribes to the event of 'tag'"},
  {"eventpush", AFB_SESSION_NONE, eventpush   , "pushs the event of 'tag' with the 'data'"},
  {NULL}
};

static const struct afb_binding plugin_desc = {
	.type = AFB_BINDING_VERSION_1,
	.v1 = {
		.info = "Minimal Hello World Sample",
		.prefix = "hello",
		.verbs = verbs
	}
};

const struct afb_binding *afbBindingV1Register (const struct afb_binding_interface *itf)
{
	interface = itf;
	return &plugin_desc;
}