src/afb-ws-json1.c

   1 /*
   2  * Copyright (C) 2016, 2017 "IoT.bzh"
   3  * Author: José Bollo <jose.bollo@iot.bzh>
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *   http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #define _GNU_SOURCE
  19
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <assert.h>
  23 #include <errno.h>
  24 #include <string.h>
  25
  26 #include <json-c/json.h>
  27
  28 #include <afb/afb-req-itf.h>
  29
  30 #include "afb-wsj1.h"
  31 #include "afb-ws-json1.h"
  32 #include "afb-common.h"
  33 #include "afb-msg-json.h"
  34 #include "afb-session.h"
  35 #include "afb-cred.h"
  36 #include "afb-apis.h"
  37 #include "afb-xreq.h"
  38 #include "afb-context.h"
  39 #include "afb-evt.h"
  40 #include "afb-subcall.h"
  41 #include "verbose.h"
  42
  43 /* predeclaration of structures */
  44 struct afb_ws_json1;
  45 struct afb_wsreq;
  46
  47 /* predeclaration of websocket callbacks */
  48 static void aws_on_hangup(struct afb_ws_json1 *ws, struct afb_wsj1 *wsj1);
  49 static void aws_on_call(struct afb_ws_json1 *ws, const char *api, const char *verb, struct afb_wsj1_msg *msg);
  50 static void aws_on_event(struct afb_ws_json1 *ws, const char *event, int eventid, struct json_object *object);
  51
  52 /* predeclaration of wsreq callbacks */
  53 static void wsreq_destroy(struct afb_wsreq *wsreq);
  54 static struct json_object *wsreq_json(struct afb_wsreq *wsreq);
  55 static void wsreq_reply(struct afb_wsreq *wsreq, int iserror, json_object *obj);
  56
  57 /* declaration of websocket structure */
  58 struct afb_ws_json1
  59 {
  60         int refcount;
  61         void (*cleanup)(void*);
  62         void *cleanup_closure;
  63         struct afb_session *session;
  64         struct afb_evt_listener *listener;
  65         struct afb_wsj1 *wsj1;
  66         struct afb_cred *cred;
  67         int new_session;
  68 };
  69
  70 /* declaration of wsreq structure */
  71 struct afb_wsreq
  72 {
  73         struct afb_xreq xreq;
  74         struct afb_ws_json1 *aws;
  75         struct afb_wsreq *next;
  76         struct afb_wsj1_msg *msgj1;
  77 };
  78
  79 /* interface for afb_ws_json1 / afb_wsj1 */
  80 static struct afb_wsj1_itf wsj1_itf = {
  81         .on_hangup = (void*)aws_on_hangup,
  82         .on_call = (void*)aws_on_call
  83 };
  84
  85 /* interface for xreq */
  86 const struct afb_xreq_query_itf afb_ws_json1_xreq_itf = {
  87         .json = (void*)wsreq_json,
  88         .reply = (void*)wsreq_reply,
  89         .unref = (void*)wsreq_destroy
  90 };
  91
  92 /* the interface for events */
  93 static const struct afb_evt_itf evt_itf = {
  94         .broadcast = (void*)aws_on_event,
  95         .push = (void*)aws_on_event
  96 };
  97
  98 /***************************************************************
  99 ****************************************************************
 100 **
 101 **  functions of afb_ws_json1 / afb_wsj1
 102 **
 103 ****************************************************************
 104 ***************************************************************/
 105
 106 struct afb_ws_json1 *afb_ws_json1_create(int fd, struct afb_context *context, void (*cleanup)(void*), void *cleanup_closure)
 107 {
 108         struct afb_ws_json1 *result;
 109
 110         assert(fd >= 0);
 111         assert(context != NULL);
 112
 113         result = malloc(sizeof * result);
 114         if (result == NULL)
 115                 goto error;
 116
 117         result->refcount = 1;
 118         result->cleanup = cleanup;
 119         result->cleanup_closure = cleanup_closure;
 120         result->session = afb_session_addref(context->session);
 121         result->new_session = context->created != 0;
 122         if (result->session == NULL)
 123                 goto error2;
 124
 125         result->wsj1 = afb_wsj1_create(afb_common_get_event_loop(), fd, &wsj1_itf, result);
 126         if (result->wsj1 == NULL)
 127                 goto error3;
 128
 129         result->listener = afb_evt_listener_create(&evt_itf, result);
 130         if (result->listener == NULL)
 131                 goto error4;
 132
 133         result->cred = afb_cred_create_for_socket(fd);
 134         return result;
 135
 136 error4:
 137         afb_wsj1_unref(result->wsj1);
 138 error3:
 139         afb_session_unref(result->session);
 140 error2:
 141         free(result);
 142 error:
 143         close(fd);
 144         return NULL;
 145 }
 146
 147 static struct afb_ws_json1 *aws_addref(struct afb_ws_json1 *ws)
 148 {
 149         ws->refcount++;
 150         return ws;
 151 }
 152
 153 static void aws_unref(struct afb_ws_json1 *ws)
 154 {
 155         if (--ws->refcount == 0) {
 156                 afb_evt_listener_unref(ws->listener);
 157                 afb_wsj1_unref(ws->wsj1);
 158                 if (ws->cleanup != NULL)
 159                         ws->cleanup(ws->cleanup_closure);
 160                 afb_session_unref(ws->session);
 161                 afb_cred_unref(ws->cred);
 162                 free(ws);
 163         }
 164 }
 165
 166 static void aws_on_hangup(struct afb_ws_json1 *ws, struct afb_wsj1 *wsj1)
 167 {
 168         aws_unref(ws);
 169 }
 170
 171 static void aws_on_call(struct afb_ws_json1 *ws, const char *api, const char *verb, struct afb_wsj1_msg *msg)
 172 {
 173         struct afb_wsreq *wsreq;
 174
 175         DEBUG("received websocket request for %s/%s: %s", api, verb, afb_wsj1_msg_object_s(msg));
 176
 177         /* allocate */
 178         wsreq = calloc(1, sizeof *wsreq);
 179         if (wsreq == NULL) {
 180                 afb_wsj1_close(ws->wsj1, 1008, NULL);
 181                 return;
 182         }
 183
 184         /* init the context */
 185         afb_context_init(&wsreq->xreq.context, ws->session, afb_wsj1_msg_token(msg));
 186         if (!wsreq->xreq.context.invalidated)
 187                 wsreq->xreq.context.validated = 1;
 188         if (ws->new_session != 0) {
 189                 wsreq->xreq.context.created = 1;
 190                 ws->new_session = 0;
 191         }
 192
 193         /* fill and record the request */
 194         afb_wsj1_msg_addref(msg);
 195         wsreq->msgj1 = msg;
 196         wsreq->xreq.refcount = 1;
 197         wsreq->xreq.query = wsreq;
 198         wsreq->xreq.queryitf = &afb_ws_json1_xreq_itf;
 199         wsreq->xreq.api = api;
 200         wsreq->xreq.verb = verb;
 201         wsreq->aws = aws_addref(ws);
 202         wsreq->xreq.listener = wsreq->aws->listener;
 203
 204         /* emits the call */
 205         afb_apis_call(&wsreq->xreq);
 206         afb_xreq_unref(&wsreq->xreq);
 207 }
 208
 209 static void aws_on_event(struct afb_ws_json1 *aws, const char *event, int eventid, struct json_object *object)
 210 {
 211         afb_wsj1_send_event_j(aws->wsj1, event, afb_msg_json_event(event, object));
 212 }
 213
 214 /***************************************************************
 215 ****************************************************************
 216 **
 217 **  functions of wsreq / afb_req
 218 **
 219 ****************************************************************
 220 ***************************************************************/
 221
 222 static void wsreq_destroy(struct afb_wsreq *wsreq)
 223 {
 224         afb_context_disconnect(&wsreq->xreq.context);
 225         afb_wsj1_msg_unref(wsreq->msgj1);
 226         aws_unref(wsreq->aws);
 227         free(wsreq);
 228 }
 229
 230 static struct json_object *wsreq_json(struct afb_wsreq *wsreq)
 231 {
 232         return afb_wsj1_msg_object_j(wsreq->msgj1);
 233 }
 234
 235 static void wsreq_reply(struct afb_wsreq *wsreq, int iserror, json_object *obj)
 236 {
 237         int rc;
 238
 239         rc = (iserror ? afb_wsj1_reply_error_j : afb_wsj1_reply_ok_j)(
 240                         wsreq->msgj1, obj, afb_context_sent_token(&wsreq->xreq.context));
 241         if (rc)
 242                 ERROR("Can't send reply: %m");
 243 }
 244