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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.
*/
#pragma once
/* avoid inclusion of <json-c/json.h> */
struct json_object;
/*
* Interface for internal of services
* It records the functions to be called for the request.
* Don't use this structure directly.
* Use the helper functions documented below.
*/
struct afb_service_itf
{
/* CAUTION: respect the order, add at the end */
void (*call)(void *closure, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *callback_closure);
};
/*
* Object that encapsulate accesses to service items
*/
struct afb_service
{
const struct afb_service_itf *itf;
void *closure;
};
/*
* When a binding have an exported implementation of the
* function 'afbBindingV1ServiceInit', defined below,
* the framework calls it for initialising the service after
* registration of all bindings.
*
* The object 'service' should be recorded. It has functions that
* allows the binding to call features with its own personality.
*
* The function should return 0 in case of success or, else, should return
* a negative value.
*/
extern int afbBindingV1ServiceInit(struct afb_service service);
/*
* When a binding have an implementation of the function 'afbBindingV1ServiceEvent',
* defined below, the framework calls that function for any broadcasted event or for
* events that the service subscribed to in its name.
*
* It receive the 'event' name and its related data in 'object' (be aware that 'object'
* might be NULL).
*/
extern void afbBindingV1ServiceEvent(const char *event, struct json_object *object);
/*
* Calls the 'verb' of the 'api' with the arguments 'args' and 'verb' in the name of the binding.
* The result of the call is delivered to the 'callback' function with the 'callback_closure'.
*
* The 'callcack' receives 3 arguments:
* 1. 'closure' the user defined closure pointer 'callback_closure',
* 2. 'iserror' a boolean status being true (not null) when an error occured,
* 2. 'result' the resulting data as a JSON object.
*
* See also 'afb_req_subcall'
*
* Returns 0in case of success or -1 in case of error.
*/
static inline void afb_service_call(struct afb_service service, const char *api, const char *verb, struct json_object *args, void (*callback)(void*closure, int iserror, struct json_object *result), void *callback_closure)
{
service.itf->call(service.closure, api, verb, args, callback, callback_closure);
}
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