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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
#define NO_BINDING_VERBOSE_MACRO
#include <string.h>
#include <dlfcn.h>
#include <assert.h>
#include <afb/afb-binding.h>
#include "afb-apis.h"
#include "afb-svc.h"
#include "afb-ditf.h"
#include "afb-evt.h"
#include "afb-common.h"
#include "afb-context.h"
#include "afb-api-so.h"
#include "afb-xreq.h"
#include "verbose.h"
/*
* names of symbols
*/
static const char afb_api_so_v2_descriptor[] = "afbBindingV2";
/*
* Description of a binding
*/
struct api_so_v2 {
struct afb_binding_v2 *binding; /* descriptor */
void *handle; /* context of dlopen */
struct afb_svc *service; /* handler for service started */
struct afb_ditf ditf; /* daemon interface */
};
static const struct afb_verb_v2 *search(struct api_so_v2 *desc, const char *verb)
{
const struct afb_verb_v2 *result;
result = desc->binding->verbs;
while (result->verb && strcasecmp(result->verb, verb))
result++;
return result->verb ? result : NULL;
}
static void call_cb(void *closure, struct afb_xreq *xreq)
{
struct api_so_v2 *desc = closure;
const struct afb_verb_v2 *verb;
verb = search(desc, xreq->verb);
if (!verb)
afb_xreq_fail_f(xreq, "unknown-verb", "verb %s unknown within api %s", xreq->verb, desc->binding->api);
else
afb_xreq_call(xreq, verb->session, verb->callback);
}
static int service_start_cb(void *closure, int share_session, int onneed)
{
int (*start)(const struct afb_binding_interface *interface, struct afb_service service);
void (*onevent)(const char *event, struct json_object *object);
struct api_so_v2 *desc = closure;
/* check state */
if (desc->service != NULL) {
/* not an error when onneed */
if (onneed != 0)
return 0;
/* already started: it is an error */
ERROR("Service %s already started", desc->binding->api);
return -1;
}
/* get the initialisation */
start = desc->binding->start;
if (start == NULL) {
/* not an error when onneed */
if (onneed != 0)
return 0;
/* no initialisation method */
ERROR("Binding %s is not a service", desc->binding->api);
return -1;
}
/* get the event handler if any */
onevent = desc->binding->onevent;
desc->service = afb_svc_create_v2(share_session, onevent, start, &desc->ditf.interface);
if (desc->service == NULL) {
/* starting error */
ERROR("Starting service %s failed", desc->binding->api);
return -1;
}
return 0;
}
static void update_hooks_cb(void *closure)
{
struct api_so_v2 *desc = closure;
afb_ditf_update_hook(&desc->ditf);
}
int afb_api_so_v2_add(const char *path, void *handle)
{
int rc;
struct api_so_v2 *desc;
struct afb_binding_v2 *binding;
struct afb_api afb_api;
/* retrieves the register function */
binding = dlsym(handle, afb_api_so_v2_descriptor);
if (!binding)
return 0;
INFO("binding [%s] looks like an AFB binding V2", path);
/* basic checks */
if (binding->api == NULL || *binding->api == 0) {
ERROR("binding [%s] bad api name...", path);
goto error;
}
if (!afb_apis_is_valid_api_name(binding->api)) {
ERROR("binding [%s] invalid api name...", path);
goto error;
}
if (binding->specification == NULL || *binding->specification == 0) {
ERROR("binding [%s] bad specification...", path);
goto error;
}
if (binding->verbs == NULL) {
ERROR("binding [%s] no verbs...", path);
goto error;
}
/* allocates the description */
desc = calloc(1, sizeof *desc);
if (desc == NULL) {
ERROR("out of memory");
goto error;
}
desc->binding = binding;
desc->handle = handle;
/* init the interface */
afb_ditf_init(&desc->ditf, binding->api);
/* for log purpose, a fake binding is needed here */
/* init the binding */
if (binding->init) {
NOTICE("binding %s [%s] calling init function", binding->api, path);
rc = binding->init(&desc->ditf.interface);
if (rc < 0) {
ERROR("binding %s [%s] initialisation function failed...", binding->api, path);
goto error2;
}
}
/* records the binding */
afb_api.closure = desc;
afb_api.call = call_cb;
afb_api.service_start = service_start_cb;
afb_api.update_hooks = update_hooks_cb;
if (afb_apis_add(binding->api, afb_api) < 0) {
ERROR("binding [%s] can't be registered...", path);
goto error2;
}
NOTICE("binding %s loaded with API prefix %s", path, binding->api);
return 1;
error2:
free(desc);
error:
return -1;
}
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