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/*
* Copyright (C) 2016 "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 <string.h>
#include <json-c/json.h>
#include <afb/afb-req-itf.h>
#include "afb-subcall.h"
#include "afb-msg-json.h"
#include "afb-apis.h"
#include "afb-context.h"
#include "verbose.h"
struct afb_subcall;
static void subcall_addref(struct afb_subcall *subcall);
static void subcall_unref(struct afb_subcall *subcall);
static struct json_object *subcall_json(struct afb_subcall *subcall);
static struct afb_arg subcall_get(struct afb_subcall *subcall, const char *name);
static void subcall_fail(struct afb_subcall *subcall, const char *status, const char *info);
static void subcall_success(struct afb_subcall *subcall, struct json_object *obj, const char *info);
static const char *subcall_raw(struct afb_subcall *subcall, size_t *size);
static void subcall_send(struct afb_subcall *subcall, const char *buffer, size_t size);
static int subcall_subscribe(struct afb_subcall *subcall, struct afb_event event);
static int subcall_unsubscribe(struct afb_subcall *subcall, struct afb_event event);
static void subcall_session_close(struct afb_subcall *subcall);
static int subcall_session_set_LOA(struct afb_subcall *subcall, unsigned loa);
static void subcall_subcall(struct afb_subcall *subcall, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *closure);
const struct afb_req_itf afb_subcall_req_itf = {
.json = (void*)subcall_json,
.get = (void*)subcall_get,
.success = (void*)subcall_success,
.fail = (void*)subcall_fail,
.raw = (void*)subcall_raw,
.send = (void*)subcall_send,
.context_get = (void*)afb_context_get,
.context_set = (void*)afb_context_set,
.addref = (void*)subcall_addref,
.unref = (void*)subcall_unref,
.session_close = (void*)subcall_session_close,
.session_set_LOA = (void*)subcall_session_set_LOA,
.subscribe = (void*)subcall_subscribe,
.unsubscribe = (void*)subcall_unsubscribe,
.subcall = (void*)subcall_subcall
};
struct afb_subcall
{
/*
* CAUTION: 'context' field should be the first because there
* is an implicit convertion to struct afb_context
*/
struct afb_context context;
struct afb_context *original_context;
int refcount;
struct json_object *args;
struct afb_req req;
void (*callback)(void*, int, struct json_object*);
void *closure;
};
static void subcall_addref(struct afb_subcall *subcall)
{
subcall->refcount++;
}
static void subcall_unref(struct afb_subcall *subcall)
{
if (0 == --subcall->refcount) {
json_object_put(subcall->args);
afb_req_unref(subcall->req);
free(subcall);
}
}
static struct json_object *subcall_json(struct afb_subcall *subcall)
{
return subcall->args;
}
static struct afb_arg subcall_get(struct afb_subcall *subcall, const char *name)
{
return afb_msg_json_get_arg(subcall->args, name);
}
static void subcall_emit(struct afb_subcall *subcall, int iserror, struct json_object *object)
{
if (subcall->context.refreshing != 0)
subcall->original_context->refreshing = 1;
subcall->callback(subcall->closure, iserror, object);
json_object_put(object);
}
static void subcall_fail(struct afb_subcall *subcall, const char *status, const char *info)
{
subcall_emit(subcall, 1, afb_msg_json_reply_error(status, info, NULL, NULL));
}
static void subcall_success(struct afb_subcall *subcall, struct json_object *obj, const char *info)
{
subcall_emit(subcall, 0, afb_msg_json_reply_ok(info, obj, NULL, NULL));
}
static const char *subcall_raw(struct afb_subcall *subcall, size_t *size)
{
const char *result = json_object_to_json_string(subcall->args);
if (size != NULL)
*size = strlen(result);
return result;
}
static void subcall_send(struct afb_subcall *subcall, const char *buffer, size_t size)
{
subcall_emit(subcall, 0, json_tokener_parse(buffer));
}
static void subcall_session_close(struct afb_subcall *subcall)
{
afb_req_session_close(subcall->req);
}
static int subcall_session_set_LOA(struct afb_subcall *subcall, unsigned loa)
{
return afb_req_session_set_LOA(subcall->req, loa);
}
static int subcall_subscribe(struct afb_subcall *subcall, struct afb_event event)
{
return afb_req_subscribe(subcall->req, event);
}
static int subcall_unsubscribe(struct afb_subcall *subcall, struct afb_event event)
{
return afb_req_unsubscribe(subcall->req, event);
}
static void subcall_subcall(struct afb_subcall *subcall, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *closure)
{
afb_subcall(&subcall->context, api, verb, args, callback, closure, (struct afb_req){ .itf = &afb_subcall_req_itf, .closure = subcall });
}
void afb_subcall_internal_error(void (*callback)(void*, int, struct json_object*), void *closure)
{
static struct json_object *obj;
if (obj == NULL)
obj = afb_msg_json_reply_error("failed", "internal error", NULL, NULL);
callback(closure, 1, obj);
}
void afb_subcall(struct afb_context *context, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *closure, struct afb_req req)
{
struct afb_subcall *subcall;
subcall = calloc(1, sizeof *subcall);
if (subcall == NULL) {
afb_subcall_internal_error(callback, closure);
return;
}
subcall->original_context = context;
subcall->refcount = 1;
subcall->args = args;
subcall->req = req;
subcall->callback = callback;
subcall->closure = closure;
subcall->context = *context;
afb_req_addref(req);
afb_apis_call_((struct afb_req){ .itf = &afb_subcall_req_itf, .closure = subcall }, &subcall->context, api, verb);
subcall_unref(subcall);
}
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