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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
#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 "afb-xreq.h"
#include "afb-cred.h"
#include "verbose.h"
#include "jobs.h"
struct subcall;
static void subcall_destroy(struct afb_xreq *xreq);
static void subcall_reply(struct afb_xreq *xreq, int iserror, struct json_object *obj);
static int subcall_subscribe(struct afb_xreq *xreq, struct afb_event event);
static int subcall_unsubscribe(struct afb_xreq *xreq, struct afb_event event);
const struct afb_xreq_query_itf afb_subcall_xreq_itf = {
.reply = subcall_reply,
.unref = subcall_destroy,
.subscribe = subcall_subscribe,
.unsubscribe = subcall_unsubscribe
};
struct subcall
{
struct afb_xreq xreq;
struct afb_xreq *caller;
void (*callback)(void*, int, struct json_object*);
void *closure;
};
static void subcall_destroy(struct afb_xreq *xreq)
{
struct subcall *subcall = CONTAINER_OF_XREQ(struct subcall, xreq);
json_object_put(subcall->xreq.json);
afb_cred_unref(subcall->xreq.cred);
afb_xreq_unref(subcall->caller);
free(subcall);
}
static void subcall_reply(struct afb_xreq *xreq, int iserror, struct json_object *obj)
{
struct subcall *subcall = CONTAINER_OF_XREQ(struct subcall, xreq);
subcall->callback(subcall->closure, iserror, obj);
json_object_put(obj);
}
static int subcall_subscribe(struct afb_xreq *xreq, struct afb_event event)
{
struct subcall *subcall = CONTAINER_OF_XREQ(struct subcall, xreq);
return afb_xreq_subscribe(subcall->caller, event);
}
static int subcall_unsubscribe(struct afb_xreq *xreq, struct afb_event event)
{
struct subcall *subcall = CONTAINER_OF_XREQ(struct subcall, xreq);
return afb_xreq_unsubscribe(subcall->caller, event);
}
static struct subcall *create_subcall(struct afb_xreq *caller, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *closure)
{
struct subcall *subcall;
size_t lenapi, lenverb;
char *copy;
lenapi = 1 + strlen(api);
lenverb = 1 + strlen(verb);
subcall = malloc(lenapi + lenverb + sizeof *subcall);
if (subcall == NULL) {
return NULL;
}
afb_xreq_init(&subcall->xreq, &afb_subcall_xreq_itf);
afb_context_subinit(&subcall->xreq.context, &caller->context);
subcall->xreq.cred = afb_cred_addref(caller->cred);
subcall->xreq.json = args;
copy = (char*)&subcall[1];
memcpy(copy, api, lenapi);
subcall->xreq.api = copy;
copy = ©[lenapi];
memcpy(copy, verb, lenverb);
subcall->xreq.verb = copy;
subcall->caller = caller;
subcall->callback = callback;
subcall->closure = closure;
afb_xreq_addref(caller);
json_object_get(args);
return subcall;
}
void afb_subcall(
struct afb_xreq *caller,
const char *api,
const char *verb,
struct json_object *args,
void (*callback)(void*, int, struct json_object*),
void *closure
)
{
struct subcall *subcall;
subcall = create_subcall(caller, api, verb, args, callback, closure);
if (subcall == NULL) {
callback(closure, 1, afb_msg_json_internal_error());
return;
}
afb_apis_call(&subcall->xreq);
afb_xreq_unref(&subcall->xreq);
}
struct subcall_sync
{
struct afb_xreq *caller;
const char *api;
const char *verb;
struct json_object *args;
struct jobloop *jobloop;
struct json_object *result;
int iserror;
};
static void subcall_sync_leave(struct subcall_sync *sync)
{
struct jobloop *jobloop = sync->jobloop;
sync->jobloop = NULL;
if (jobloop)
jobs_leave(jobloop);
}
static void subcall_sync_reply(void *closure, int iserror, struct json_object *obj)
{
struct subcall_sync *sync = closure;
sync->iserror = iserror;
sync->result = obj;
json_object_get(obj);
subcall_sync_leave(sync);
}
static void subcall_sync_enter(int signum, void *closure, struct jobloop *jobloop)
{
struct subcall_sync *sync = closure;
if (!signum) {
sync->jobloop = jobloop;
afb_xreq_unhooked_subcall(sync->caller, sync->api, sync->verb, sync->args, subcall_sync_reply, sync);
} else {
sync->result = json_object_get(afb_msg_json_internal_error());
sync->iserror = 1;
subcall_sync_leave(sync);
}
}
int afb_subcall_sync(
struct afb_xreq *caller,
const char *api,
const char *verb,
struct json_object *args,
struct json_object **result
)
{
int rc;
struct subcall_sync sync;
sync.caller = caller;
sync.api = api;
sync.verb = verb;
sync.args = args;
sync.jobloop = NULL;
sync.result = NULL;
sync.iserror = 1;
rc = jobs_enter(NULL, 0, subcall_sync_enter, &sync);
if (rc < 0) {
sync.result = json_object_get(afb_msg_json_internal_error());
sync.iserror = 1;
}
rc = !sync.iserror;
*result = sync.result;
return rc;
}
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