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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-cred.h"
#include "afb-apis.h"
#include "afb-xreq.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_destroy(struct afb_xreq *xreq);
static void wsreq_reply(struct afb_xreq *xreq, int iserror, json_object *obj);
/* 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;
struct afb_cred *cred;
int new_session;
};
/* declaration of wsreq structure */
struct afb_wsreq
{
struct afb_xreq xreq;
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 xreq */
const struct afb_xreq_query_itf afb_ws_json1_xreq_itf = {
.reply = wsreq_reply,
.unref = wsreq_destroy
};
/* 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;
result->cred = afb_cred_create_for_socket(fd);
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);
afb_cred_unref(ws->cred);
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_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_xreq_init(&wsreq->xreq, &afb_ws_json1_xreq_itf);
afb_context_init(&wsreq->xreq.context, ws->session, afb_wsj1_msg_token(msg));
if (!wsreq->xreq.context.invalidated)
wsreq->xreq.context.validated = 1;
if (ws->new_session != 0) {
wsreq->xreq.context.created = 1;
ws->new_session = 0;
}
/* fill and record the request */
afb_wsj1_msg_addref(msg);
wsreq->msgj1 = msg;
wsreq->xreq.api = api;
wsreq->xreq.verb = verb;
wsreq->xreq.json = afb_wsj1_msg_object_j(wsreq->msgj1);
wsreq->aws = aws_addref(ws);
wsreq->xreq.listener = wsreq->aws->listener;
/* emits the call */
afb_apis_call(&wsreq->xreq);
afb_xreq_unref(&wsreq->xreq);
}
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_destroy(struct afb_xreq *xreq)
{
struct afb_wsreq *wsreq = CONTAINER_OF_XREQ(struct afb_wsreq, xreq);
afb_context_disconnect(&wsreq->xreq.context);
afb_wsj1_msg_unref(wsreq->msgj1);
aws_unref(wsreq->aws);
free(wsreq);
}
static void wsreq_reply(struct afb_xreq *xreq, int iserror, json_object *obj)
{
struct afb_wsreq *wsreq = CONTAINER_OF_XREQ(struct afb_wsreq, xreq);
int rc;
rc = (iserror ? afb_wsj1_reply_error_j : afb_wsj1_reply_ok_j)(
wsreq->msgj1, obj, afb_context_sent_token(&wsreq->xreq.context));
if (rc)
ERROR("Can't send reply: %m");
}
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