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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 AFB_BINDING_PRAGMA_NO_VERBOSE_MACRO
#include <stdio.h>
#include <string.h>
#include <dlfcn.h>
#include <assert.h>
#include <json-c/json.h>
#include <afb/afb-binding-v1.h>
#include "afb-api.h"
#include "afb-api-so-v1.h"
#include "afb-apiset.h"
#include "afb-svc.h"
#include "afb-evt.h"
#include "afb-common.h"
#include "afb-context.h"
#include "afb-api-so.h"
#include "afb-xreq.h"
#include "afb-ditf.h"
#include "verbose.h"
/*
* names of symbols
*/
static const char afb_api_so_v1_register[] = "afbBindingV1Register";
static const char afb_api_so_v1_service_init[] = "afbBindingV1ServiceInit";
static const char afb_api_so_v1_service_event[] = "afbBindingV1ServiceEvent";
/*
* Description of a binding
*/
struct api_so_v1 {
struct afb_binding_v1 *binding; /* descriptor */
void *handle; /* context of dlopen */
struct afb_svc *service; /* handler for service started */
struct afb_binding_interface_v1 interface;
struct afb_ditf ditf; /* daemon interface */
};
static const struct afb_verb_desc_v1 *search(struct api_so_v1 *desc, const char *name)
{
const struct afb_verb_desc_v1 *verb;
verb = desc->binding->v1.verbs;
while (verb->name && strcasecmp(verb->name, name))
verb++;
return verb->name ? verb : NULL;
}
static void call_cb(void *closure, struct afb_xreq *xreq)
{
const struct afb_verb_desc_v1 *verb;
struct api_so_v1 *desc = closure;
verb = search(desc, xreq->verb);
afb_xreq_call_verb_v1(xreq, verb);
}
static int service_start_cb(void *closure, int share_session, int onneed, struct afb_apiset *apiset)
{
int (*init)(struct afb_service service);
void (*onevent)(const char *event, struct json_object *object);
struct api_so_v1 *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->v1.prefix);
return -1;
}
/* get the initialisation */
init = dlsym(desc->handle, afb_api_so_v1_service_init);
onevent = dlsym(desc->handle, afb_api_so_v1_service_event);
if (init == NULL && onevent == NULL) {
/* not an error when onneed */
if (onneed != 0)
return 0;
/* no initialisation method */
ERROR("Binding %s is not a service", desc->binding->v1.prefix);
return -1;
}
/* get the event handler if any */
desc->service = afb_svc_create_v1(desc->binding->v1.prefix, apiset, share_session, init, onevent);
if (desc->service == NULL) {
/* starting error */
ERROR("Starting service %s failed", desc->binding->v1.prefix);
return -1;
}
return 0;
}
static void update_hooks_cb(void *closure)
{
struct api_so_v1 *desc = closure;
afb_ditf_update_hook(&desc->ditf);
}
static int get_verbosity_cb(void *closure)
{
struct api_so_v1 *desc = closure;
return desc->interface.verbosity;
}
static void set_verbosity_cb(void *closure, int level)
{
struct api_so_v1 *desc = closure;
desc->interface.verbosity = level;
}
struct json_object *describe_cb(void *closure)
{
struct api_so_v1 *desc = closure;
const struct afb_verb_desc_v1 *verb;
struct json_object *r, *v, *f, *a;
r = json_object_new_object();
json_object_object_add(r, "version", json_object_new_int(1));
json_object_object_add(r, "info", json_object_new_string(desc->binding->v1.info));
v = json_object_new_object();
json_object_object_add(r, "verbs", v);
verb = desc->binding->v1.verbs;
while (verb->name) {
f = json_object_new_object();
a = json_object_new_array();
json_object_object_add(f, "name", json_object_new_string(verb->name));
json_object_object_add(f, "info", json_object_new_string(verb->info));
if (verb->session & AFB_SESSION_CLOSE_V1)
json_object_array_add(a, json_object_new_string("session-close"));
if (verb->session & AFB_SESSION_RENEW_V1)
json_object_array_add(a, json_object_new_string("session-renew"));
if (verb->session & AFB_SESSION_CHECK_V1)
json_object_array_add(a, json_object_new_string("session-check"));
if (verb->session & AFB_SESSION_LOA_EQ_V1) {
const char *rel = "?";
char buffer[80];
switch (verb->session & AFB_SESSION_LOA_EQ_V1) {
case AFB_SESSION_LOA_GE_V1: rel = ">="; break;
case AFB_SESSION_LOA_LE_V1: rel = "<="; break;
case AFB_SESSION_LOA_EQ_V1: rel = "=="; break;
}
snprintf(buffer, sizeof buffer, "LOA%s%d", rel, (int)((verb->session >> AFB_SESSION_LOA_SHIFT_V1) & AFB_SESSION_LOA_MASK_V1));
json_object_array_add(a, json_object_new_string(buffer));
}
json_object_object_add(f, "flags", a);
json_object_object_add(v, verb->name, f);
verb++;
}
return r;
}
static struct afb_api_itf so_v1_api_itf = {
.call = call_cb,
.service_start = service_start_cb,
.update_hooks = update_hooks_cb,
.get_verbosity = get_verbosity_cb,
.set_verbosity = set_verbosity_cb,
.describe = describe_cb
};
int afb_api_so_v1_add(const char *path, void *handle, struct afb_apiset *apiset)
{
struct api_so_v1 *desc;
struct afb_binding_v1 *(*register_function) (const struct afb_binding_interface_v1 *interface);
struct afb_api afb_api;
/* retrieves the register function */
register_function = dlsym(handle, afb_api_so_v1_register);
if (!register_function)
return 0;
INFO("binding [%s] is a valid AFB binding V1", path);
/* allocates the description */
desc = calloc(1, sizeof *desc);
if (desc == NULL) {
ERROR("out of memory");
goto error;
}
desc->handle = handle;
/* init the interface */
afb_ditf_init_v1(&desc->ditf, path, &desc->interface);
/* init the binding */
INFO("binding [%s] calling registering function %s", path, afb_api_so_v1_register);
desc->binding = register_function(&desc->interface);
if (desc->binding == NULL) {
ERROR("binding [%s] register function failed. continuing...", path);
goto error2;
}
/* check the returned structure */
if (desc->binding->type != AFB_BINDING_VERSION_1) {
ERROR("binding [%s] invalid type %d...", path, desc->binding->type);
goto error2;
}
if (desc->binding->v1.prefix == NULL || *desc->binding->v1.prefix == 0) {
ERROR("binding [%s] bad prefix...", path);
goto error2;
}
if (!afb_api_is_valid_name(desc->binding->v1.prefix)) {
ERROR("binding [%s] invalid prefix...", path);
goto error2;
}
if (desc->binding->v1.info == NULL || *desc->binding->v1.info == 0) {
ERROR("binding [%s] bad description...", path);
goto error2;
}
if (desc->binding->v1.verbs == NULL) {
ERROR("binding [%s] no APIs...", path);
goto error2;
}
/* records the binding */
afb_ditf_rename(&desc->ditf, desc->binding->v1.prefix);
afb_api.closure = desc;
afb_api.itf = &so_v1_api_itf;
if (afb_apiset_add(apiset, desc->binding->v1.prefix, afb_api) < 0) {
ERROR("binding [%s] can't be registered...", path);
goto error2;
}
INFO("binding %s loaded with API prefix %s", path, desc->binding->v1.prefix);
return 1;
error2:
free(desc);
error:
return -1;
}
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