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/*
* Copyright (C) 2016, 2017 "IoT.bzh"
* Author: José Bollo <jose.bollo@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.
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <json-c/json.h>
#include <afb/afb-req-itf.h>
#include <afb/afb-service-itf.h>
#include "afb-session.h"
#include "afb-context.h"
#include "afb-evt.h"
#include "afb-msg-json.h"
#include "afb-svc.h"
#include "afb-xreq.h"
#include "afb-apis.h"
#include "verbose.h"
/*
* Structure for recording service
*/
struct afb_svc
{
/* session of the service */
struct afb_session *session;
/* event listener of the service or NULL */
struct afb_evt_listener *listener;
/* on event callback for the service */
void (*on_event)(const char *event, struct json_object *object);
};
/*
* Structure for requests initiated by the service
*/
struct svc_req
{
struct afb_xreq xreq;
/* the args */
struct json_object *args;
void (*callback)(void*, int, struct json_object*);
void *closure;
/* the service */
struct afb_svc *svc;
};
/* functions for services */
static void svc_on_event(void *closure, const char *event, int eventid, struct json_object *object);
static void svc_call(void *closure, const char *api, const char *verb, struct json_object *args,
void (*callback)(void*, int, struct json_object*), void *cbclosure);
/* the interface for services */
static const struct afb_service_itf service_itf = {
.call = svc_call
};
/* the interface for events */
static const struct afb_evt_itf evt_itf = {
.broadcast = svc_on_event,
.push = svc_on_event
};
/* functions for requests of services */
static struct json_object *svcreq_json(void *closure);
static void svcreq_destroy(void *closure);
static void svcreq_reply(void *closure, int iserror, json_object *obj);
/* interface for requests of services */
const struct afb_xreq_query_itf afb_svc_xreq_itf = {
.unref = svcreq_destroy,
.json = svcreq_json,
.reply = svcreq_reply
};
/* the common session for services sharing their session */
static struct afb_session *common_session;
/*
* Allocates a new service
*/
static struct afb_svc *afb_svc_alloc(int share_session, void (*on_event)(const char *event, struct json_object *object))
{
struct afb_svc *svc;
/* allocates the svc handler */
svc = malloc(sizeof * svc);
if (svc == NULL)
goto error;
/* instanciate the session */
if (share_session) {
/* session shared with other svcs */
if (common_session == NULL) {
common_session = afb_session_create (NULL, 0);
if (common_session == NULL)
goto error2;
}
svc->session = afb_session_addref(common_session);
} else {
/* session dedicated to the svc */
svc->session = afb_session_create (NULL, 0);
if (svc->session == NULL)
goto error2;
}
/* initialises the listener if needed */
svc->on_event = on_event;
if (on_event == NULL)
svc->listener = NULL;
else {
svc->listener = afb_evt_listener_create(&evt_itf, svc);
if (svc->listener == NULL)
goto error3;
}
return svc;
error3:
afb_session_unref(svc->session);
error2:
free(svc);
error:
return NULL;
}
/*
* Creates a new service
*/
struct afb_svc *afb_svc_create(int share_session, int (*init)(struct afb_service service), void (*on_event)(const char *event, struct json_object *object))
{
int rc;
struct afb_svc *svc;
/* allocates the svc handler */
svc = afb_svc_alloc(share_session, on_event);
if (svc == NULL)
goto error;
/* initialises the svc now */
rc = init((struct afb_service){ .itf = &service_itf, .closure = svc });
if (rc < 0)
goto error2;
return svc;
error2:
if (svc->listener != NULL)
afb_evt_listener_unref(svc->listener);
afb_session_unref(svc->session);
free(svc);
error:
return NULL;
}
/*
* Creates a new service
*/
struct afb_svc *afb_svc_create_v2(
int share_session,
void (*on_event)(const char *event, struct json_object *object),
int (*start)(const struct afb_binding_interface *interface, struct afb_service service),
const struct afb_binding_interface *interface)
{
int rc;
struct afb_svc *svc;
/* allocates the svc handler */
svc = afb_svc_alloc(share_session, on_event);
if (svc == NULL)
goto error;
/* initialises the svc now */
rc = start(interface, (struct afb_service){ .itf = &service_itf, .closure = svc });
if (rc < 0)
goto error2;
return svc;
error2:
if (svc->listener != NULL)
afb_evt_listener_unref(svc->listener);
afb_session_unref(svc->session);
free(svc);
error:
return NULL;
}
/*
* Propagates the event to the service
*/
static void svc_on_event(void *closure, const char *event, int eventid, struct json_object *object)
{
struct afb_svc *svc = closure;
svc->on_event(event, object);
json_object_put(object);
}
/*
* Initiates a call for the service
*/
static void svc_call(void *closure, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cbclosure)
{
struct afb_svc *svc = closure;
struct svc_req *svcreq;
/* allocates the request */
svcreq = calloc(1, sizeof *svcreq);
if (svcreq == NULL) {
ERROR("out of memory");
json_object_put(args);
callback(cbclosure, 1, afb_msg_json_internal_error());
return;
}
/* initialises the request */
afb_context_init(&svcreq->xreq.context, svc->session, NULL);
svcreq->xreq.context.validated = 1;
svcreq->xreq.refcount = 1;
svcreq->xreq.query = svcreq;
svcreq->xreq.queryitf = &afb_svc_xreq_itf;
svcreq->xreq.api = api;
svcreq->xreq.verb = verb;
svcreq->xreq.listener = svc->listener;
svcreq->args = args;
svcreq->callback = callback;
svcreq->closure = cbclosure;
svcreq->svc = svc;
/* terminates and frees ressources if needed */
afb_apis_call(&svcreq->xreq);
afb_xreq_unref(&svcreq->xreq);
}
static void svcreq_destroy(void *closure)
{
struct svc_req *svcreq = closure;
afb_context_disconnect(&svcreq->xreq.context);
json_object_put(svcreq->args);
free(svcreq);
}
static struct json_object *svcreq_json(void *closure)
{
struct svc_req *svcreq = closure;
return svcreq->args;
}
static void svcreq_reply(void *closure, int iserror, json_object *obj)
{
struct svc_req *svcreq = closure;
svcreq->callback(svcreq->closure, iserror, obj);
json_object_put(obj);
}
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