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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 <unistd.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <json-c/json.h>
#include <afb/afb-req-itf.h>
#include "afb-wsj1.h"
#include "afb-ws-json1.h"
#include "afb-common.h"
#include "afb-msg-json.h"
#include "afb-session.h"
#include "afb-apis.h"
#include "afb-context.h"
#include "afb-evt.h"
#include "afb-subcall.h"
#include "verbose.h"
/* predeclaration of structures */
struct afb_ws_json1;
struct afb_wsreq;
/* predeclaration of websocket callbacks */
static void aws_on_hangup(struct afb_ws_json1 *ws, struct afb_wsj1 *wsj1);
static void aws_on_call(struct afb_ws_json1 *ws, const char *api, const char *verb, struct afb_wsj1_msg *msg);
static void aws_on_event(struct afb_ws_json1 *ws, const char *event, int eventid, struct json_object *object);
/* predeclaration of wsreq callbacks */
static void wsreq_addref(struct afb_wsreq *wsreq);
static void wsreq_unref(struct afb_wsreq *wsreq);
static struct json_object *wsreq_json(struct afb_wsreq *wsreq);
static struct afb_arg wsreq_get(struct afb_wsreq *wsreq, const char *name);
static void wsreq_fail(struct afb_wsreq *wsreq, const char *status, const char *info);
static void wsreq_success(struct afb_wsreq *wsreq, struct json_object *obj, const char *info);
static const char *wsreq_raw(struct afb_wsreq *wsreq, size_t *size);
static void wsreq_send(struct afb_wsreq *wsreq, const char *buffer, size_t size);
static int wsreq_subscribe(struct afb_wsreq *wsreq, struct afb_event event);
static int wsreq_unsubscribe(struct afb_wsreq *wsreq, struct afb_event event);
static void wsreq_subcall(struct afb_wsreq *wsreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *closure);
/* declaration of websocket structure */
struct afb_ws_json1
{
int refcount;
void (*cleanup)(void*);
void *cleanup_closure;
struct afb_session *session;
struct afb_evt_listener *listener;
struct afb_wsj1 *wsj1;
int new_session;
};
/* declaration of wsreq structure */
struct afb_wsreq
{
/*
* CAUTION: 'context' field should be the first because there
* is an implicit convertion to struct afb_context
*/
struct afb_context context;
int refcount;
struct afb_ws_json1 *aws;
struct afb_wsreq *next;
struct afb_wsj1_msg *msgj1;
};
/* interface for afb_ws_json1 / afb_wsj1 */
static struct afb_wsj1_itf wsj1_itf = {
.on_hangup = (void*)aws_on_hangup,
.on_call = (void*)aws_on_call
};
/* interface for wsreq / afb_req */
const struct afb_req_itf afb_ws_json1_req_itf = {
.json = (void*)wsreq_json,
.get = (void*)wsreq_get,
.success = (void*)wsreq_success,
.fail = (void*)wsreq_fail,
.raw = (void*)wsreq_raw,
.send = (void*)wsreq_send,
.context_get = (void*)afb_context_get,
.context_set = (void*)afb_context_set,
.addref = (void*)wsreq_addref,
.unref = (void*)wsreq_unref,
.session_close = (void*)afb_context_close,
.session_set_LOA = (void*)afb_context_change_loa,
.subscribe = (void*)wsreq_subscribe,
.unsubscribe = (void*)wsreq_unsubscribe,
.subcall = (void*)wsreq_subcall
};
/* the interface for events */
static const struct afb_evt_itf evt_itf = {
.broadcast = (void*)aws_on_event,
.push = (void*)aws_on_event
};
/***************************************************************
****************************************************************
**
** functions of afb_ws_json1 / afb_wsj1
**
****************************************************************
***************************************************************/
struct afb_ws_json1 *afb_ws_json1_create(int fd, struct afb_context *context, void (*cleanup)(void*), void *cleanup_closure)
{
struct afb_ws_json1 *result;
assert(fd >= 0);
assert(context != NULL);
result = malloc(sizeof * result);
if (result == NULL)
goto error;
result->refcount = 1;
result->cleanup = cleanup;
result->cleanup_closure = cleanup_closure;
result->session = afb_session_addref(context->session);
result->new_session = context->created != 0;
if (result->session == NULL)
goto error2;
result->wsj1 = afb_wsj1_create(afb_common_get_event_loop(), fd, &wsj1_itf, result);
if (result->wsj1 == NULL)
goto error3;
result->listener = afb_evt_listener_create(&evt_itf, result);
if (result->listener == NULL)
goto error4;
return result;
error4:
afb_wsj1_unref(result->wsj1);
error3:
afb_session_unref(result->session);
error2:
free(result);
error:
close(fd);
return NULL;
}
static struct afb_ws_json1 *aws_addref(struct afb_ws_json1 *ws)
{
ws->refcount++;
return ws;
}
static void aws_unref(struct afb_ws_json1 *ws)
{
if (--ws->refcount == 0) {
afb_evt_listener_unref(ws->listener);
afb_wsj1_unref(ws->wsj1);
if (ws->cleanup != NULL)
ws->cleanup(ws->cleanup_closure);
afb_session_unref(ws->session);
free(ws);
}
}
static void aws_on_hangup(struct afb_ws_json1 *ws, struct afb_wsj1 *wsj1)
{
aws_unref(ws);
}
static void aws_on_call(struct afb_ws_json1 *ws, const char *api, const char *verb, struct afb_wsj1_msg *msg)
{
struct afb_req r;
struct afb_wsreq *wsreq;
DEBUG("received websocket request for %s/%s: %s", api, verb, afb_wsj1_msg_object_s(msg));
/* allocate */
wsreq = calloc(1, sizeof *wsreq);
if (wsreq == NULL) {
afb_wsj1_close(ws->wsj1, 1008, NULL);
return;
}
/* init the context */
afb_context_init(&wsreq->context, ws->session, afb_wsj1_msg_token(msg));
if (!wsreq->context.invalidated)
wsreq->context.validated = 1;
if (ws->new_session != 0) {
wsreq->context.created = 1;
ws->new_session = 0;
}
/* fill and record the request */
afb_wsj1_msg_addref(msg);
wsreq->msgj1 = msg;
wsreq->refcount = 1;
wsreq->aws = aws_addref(ws);
/* emits the call */
r.closure = wsreq;
r.itf = &afb_ws_json1_req_itf;
afb_apis_call(r, &wsreq->context, api, verb);
wsreq_unref(wsreq);
}
static void aws_on_event(struct afb_ws_json1 *aws, const char *event, int eventid, struct json_object *object)
{
afb_wsj1_send_event_j(aws->wsj1, event, afb_msg_json_event(event, object));
}
/***************************************************************
****************************************************************
**
** functions of wsreq / afb_req
**
****************************************************************
***************************************************************/
static void wsreq_addref(struct afb_wsreq *wsreq)
{
wsreq->refcount++;
}
static void wsreq_unref(struct afb_wsreq *wsreq)
{
if (--wsreq->refcount == 0) {
afb_context_disconnect(&wsreq->context);
afb_wsj1_msg_unref(wsreq->msgj1);
aws_unref(wsreq->aws);
free(wsreq);
}
}
static struct json_object *wsreq_json(struct afb_wsreq *wsreq)
{
return afb_wsj1_msg_object_j(wsreq->msgj1);
}
static struct afb_arg wsreq_get(struct afb_wsreq *wsreq, const char *name)
{
return afb_msg_json_get_arg(wsreq_json(wsreq), name);
}
static void wsreq_fail(struct afb_wsreq *wsreq, const char *status, const char *info)
{
int rc;
rc = afb_wsj1_reply_error_j(wsreq->msgj1, afb_msg_json_reply_error(status, info, &wsreq->context, NULL), afb_context_sent_token(&wsreq->context));
if (rc)
ERROR("Can't send fail reply: %m");
}
static void wsreq_success(struct afb_wsreq *wsreq, json_object *obj, const char *info)
{
int rc;
rc = afb_wsj1_reply_ok_j(wsreq->msgj1, afb_msg_json_reply_ok(info, obj, &wsreq->context, NULL), afb_context_sent_token(&wsreq->context));
if (rc)
ERROR("Can't send success reply: %m");
}
static const char *wsreq_raw(struct afb_wsreq *wsreq, size_t *size)
{
const char *result = afb_wsj1_msg_object_s(wsreq->msgj1);
if (size != NULL)
*size = strlen(result);
return result;
}
static void wsreq_send(struct afb_wsreq *wsreq, const char *buffer, size_t size)
{
int rc;
rc = afb_wsj1_reply_ok_s(wsreq->msgj1, buffer, afb_context_sent_token(&wsreq->context));
if (rc)
ERROR("Can't send raw reply: %m");
}
static int wsreq_subscribe(struct afb_wsreq *wsreq, struct afb_event event)
{
return afb_evt_add_watch(wsreq->aws->listener, event);
}
static int wsreq_unsubscribe(struct afb_wsreq *wsreq, struct afb_event event)
{
return afb_evt_remove_watch(wsreq->aws->listener, event);
}
static void wsreq_subcall(struct afb_wsreq *wsreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *closure)
{
afb_subcall(&wsreq->context, api, verb, args, callback, closure, (struct afb_req){ .itf = &afb_ws_json1_req_itf, .closure = wsreq });
}
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