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/*
* Copyright (C) 2015-2020 "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.
*/
#if WITH_DYNAMIC_BINDING
#define _GNU_SOURCE
#include <stdlib.h>
#include <string.h>
#include <dlfcn.h>
#include <assert.h>
#include <stdarg.h>
#include <json-c/json.h>
#include <afb/afb-binding-v3.h>
#include "afb-api.h"
#include "afb-api-so-v3.h"
#include "afb-api-v3.h"
#include "afb-apiset.h"
#include "afb-export.h"
#include "verbose.h"
/*
* names of symbols
*/
static const char afb_api_so_v3_desc[] = "afbBindingV3";
static const char afb_api_so_v3_root[] = "afbBindingV3root";
static const char afb_api_so_v3_entry[] = "afbBindingV3entry";
struct args
{
struct afb_api_x3 **root;
const struct afb_binding_v3 *desc;
int (*entry)(struct afb_api_x3 *);
};
static int init(void *closure, struct afb_api_x3 *api)
{
const struct args *a = closure;
int rc = 0;
*a->root = api;
if (a->desc) {
api->userdata = a->desc->userdata;
rc = afb_api_v3_set_binding_fields(a->desc, api);
}
if (rc >= 0 && a->entry)
rc = afb_api_v3_safe_preinit(api, a->entry);
if (rc >= 0)
afb_api_x3_seal(api);
return rc;
}
int afb_api_so_v3_add(const char *path, void *handle, struct afb_apiset *declare_set, struct afb_apiset * call_set)
{
struct args a;
struct afb_api_v3 *api;
struct afb_export *export;
/* retrieves important exported symbols */
a.desc = dlsym(handle, afb_api_so_v3_desc);
a.entry = dlsym(handle, afb_api_so_v3_entry);
if (!a.desc && !a.entry)
return 0;
INFO("binding [%s] looks like an AFB binding V3", path);
/* basic checks */
a.root = dlsym(handle, afb_api_so_v3_root);
if (!a.root) {
ERROR("binding [%s] incomplete symbol set: %s is missing",
path, afb_api_so_v3_root);
goto error;
}
if (a.desc) {
if (a.desc->api == NULL || *a.desc->api == 0) {
ERROR("binding [%s] bad api name...", path);
goto error;
}
if (!afb_api_is_valid_name(a.desc->api)) {
ERROR("binding [%s] invalid api name...", path);
goto error;
}
if (!a.entry)
a.entry = a.desc->preinit;
else if (a.desc->preinit) {
ERROR("binding [%s] clash: you can't define %s and %s.preinit, choose only one",
path, afb_api_so_v3_entry, afb_api_so_v3_desc);
goto error;
}
api = afb_api_v3_create(declare_set, call_set, a.desc->api, a.desc->info, a.desc->noconcurrency, init, &a, 0, NULL, path);
if (api)
return 1;
} else {
if (!a.entry) {
ERROR("binding [%s] incomplete symbol set: %s is missing",
path, afb_api_so_v3_entry);
goto error;
}
export = afb_export_create_none_for_path(declare_set, call_set, path, init, &a);
if (export) {
/*
* No call is done to afb_export_unref(export) because:
* - legacy applications may use the root API emitting messages
* - it allows writting applications like bindings without API
* But this has the sad effect to introduce a kind of leak.
* To avoid this, if necessary further developement should list bindings
* and their data.
*/
return 1;
}
}
ERROR("binding [%s] initialisation failed", path);
error:
return -1;
}
#endif
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