src/afb-ws-json1.c

   1 /*
   2  * Copyright (C) 2016, 2017, 2018 "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-wsj1.h"
  29 #include "afb-ws-json1.h"
  30 #include "afb-systemd.h"
  31 #include "afb-msg-json.h"
  32 #include "afb-session.h"
  33 #include "afb-cred.h"
  34 #include "afb-apiset.h"
  35 #include "afb-xreq.h"
  36 #include "afb-context.h"
  37 #include "afb-evt.h"
  38 #include "verbose.h"
  39 #include "fdev.h"
  40
  41 /* predeclaration of structures */
  42 struct afb_ws_json1;
  43 struct afb_wsreq;
  44
  45 /* predeclaration of websocket callbacks */
  46 static void aws_on_hangup_cb(void *closure, struct afb_wsj1 *wsj1);
  47 static void aws_on_call_cb(void *closure, const char *api, const char *verb, struct afb_wsj1_msg *msg);
  48 static void aws_on_push_cb(void *closure, const char *event, int eventid, struct json_object *object);
  49 static void aws_on_broadcast_cb(void *closure, const char *event, struct json_object *object);
  50
  51 /* predeclaration of wsreq callbacks */
  52 static void wsreq_destroy(struct afb_xreq *xreq);
  53 static void wsreq_reply(struct afb_xreq *xreq, struct json_object *object, const char *error, const char *info);
  54
  55 /* declaration of websocket structure */
  56 struct afb_ws_json1
  57 {
  58         int refcount;
  59         void (*cleanup)(void*);
  60         void *cleanup_closure;
  61         struct afb_session *session;
  62         struct afb_evt_listener *listener;
  63         struct afb_wsj1 *wsj1;
  64         struct afb_cred *cred;
  65         struct afb_apiset *apiset;
  66         int new_session;
  67 };
  68
  69 /* declaration of wsreq structure */
  70 struct afb_wsreq
  71 {
  72         struct afb_xreq xreq;
  73         struct afb_ws_json1 *aws;
  74         struct afb_wsreq *next;
  75         struct afb_wsj1_msg *msgj1;
  76 };
  77
  78 /* interface for afb_ws_json1 / afb_wsj1 */
  79 static struct afb_wsj1_itf wsj1_itf = {
  80         .on_hangup = aws_on_hangup_cb,
  81         .on_call = aws_on_call_cb
  82 };
  83
  84 /* interface for xreq */
  85 const struct afb_xreq_query_itf afb_ws_json1_xreq_itf = {
  86         .reply = wsreq_reply,
  87         .unref = wsreq_destroy
  88 };
  89
  90 /* the interface for events */
  91 static const struct afb_evt_itf evt_itf = {
  92         .broadcast = aws_on_broadcast_cb,
  93         .push = aws_on_push_cb
  94 };
  95
  96 /***************************************************************
  97 ****************************************************************
  98 **
  99 **  functions of afb_ws_json1 / afb_wsj1
 100 **
 101 ****************************************************************
 102 ***************************************************************/
 103
 104 struct afb_ws_json1 *afb_ws_json1_create(struct fdev *fdev, struct afb_apiset *apiset, struct afb_context *context, void (*cleanup)(void*), void *cleanup_closure)
 105 {
 106         struct afb_ws_json1 *result;
 107
 108         assert(fdev);
 109         assert(context != NULL);
 110
 111         result = malloc(sizeof * result);
 112         if (result == NULL)
 113                 goto error;
 114
 115         result->refcount = 1;
 116         result->cleanup = cleanup;
 117         result->cleanup_closure = cleanup_closure;
 118         result->session = afb_session_addref(context->session);
 119         result->new_session = context->created != 0;
 120         if (result->session == NULL)
 121                 goto error2;
 122
 123         result->wsj1 = afb_wsj1_create(fdev, &wsj1_itf, result);
 124         if (result->wsj1 == NULL)
 125                 goto error3;
 126
 127         result->listener = afb_evt_listener_create(&evt_itf, result);
 128         if (result->listener == NULL)
 129                 goto error4;
 130
 131         result->cred = afb_cred_create_for_socket(fdev_fd(fdev));
 132         result->apiset = afb_apiset_addref(apiset);
 133         return result;
 134
 135 error4:
 136         afb_wsj1_unref(result->wsj1);
 137 error3:
 138         afb_session_unref(result->session);
 139 error2:
 140         free(result);
 141 error:
 142         fdev_unref(fdev);
 143         return NULL;
 144 }
 145
 146 struct afb_ws_json1 *afb_ws_json1_addref(struct afb_ws_json1 *ws)
 147 {
 148         __atomic_add_fetch(&ws->refcount, 1, __ATOMIC_RELAXED);
 149         return ws;
 150 }
 151
 152 void afb_ws_json1_unref(struct afb_ws_json1 *ws)
 153 {
 154         if (!__atomic_sub_fetch(&ws->refcount, 1, __ATOMIC_RELAXED)) {
 155                 afb_evt_listener_unref(ws->listener);
 156                 afb_wsj1_unref(ws->wsj1);
 157                 if (ws->cleanup != NULL)
 158                         ws->cleanup(ws->cleanup_closure);
 159                 afb_session_unref(ws->session);
 160                 afb_cred_unref(ws->cred);
 161                 afb_apiset_unref(ws->apiset);
 162                 free(ws);
 163         }
 164 }
 165
 166 static void aws_on_hangup_cb(void *closure, struct afb_wsj1 *wsj1)
 167 {
 168         struct afb_ws_json1 *ws = closure;
 169         afb_ws_json1_unref(ws);
 170 }
 171
 172 static void aws_on_call_cb(void *closure, const char *api, const char *verb, struct afb_wsj1_msg *msg)
 173 {
 174         struct afb_ws_json1 *ws = closure;
 175         struct afb_wsreq *wsreq;
 176
 177         DEBUG("received websocket request for %s/%s: %s", api, verb, afb_wsj1_msg_object_s(msg));
 178
 179         /* allocate */
 180         wsreq = calloc(1, sizeof *wsreq);
 181         if (wsreq == NULL) {
 182                 afb_wsj1_close(ws->wsj1, 1008, NULL);
 183                 return;
 184         }
 185
 186         /* init the context */
 187         afb_xreq_init(&wsreq->xreq, &afb_ws_json1_xreq_itf);
 188         afb_context_init(&wsreq->xreq.context, ws->session, afb_wsj1_msg_token(msg));
 189         if (!wsreq->xreq.context.invalidated)
 190                 wsreq->xreq.context.validated = 1;
 191         if (ws->new_session != 0) {
 192                 wsreq->xreq.context.created = 1;
 193                 ws->new_session = 0;
 194         }
 195
 196         /* fill and record the request */
 197         afb_wsj1_msg_addref(msg);
 198         wsreq->msgj1 = msg;
 199         wsreq->xreq.cred = afb_cred_addref(ws->cred);
 200         wsreq->xreq.request.called_api = api;
 201         wsreq->xreq.request.called_verb = verb;
 202         wsreq->xreq.json = afb_wsj1_msg_object_j(wsreq->msgj1);
 203         wsreq->aws = afb_ws_json1_addref(ws);
 204         wsreq->xreq.listener = wsreq->aws->listener;
 205
 206         /* emits the call */
 207         afb_xreq_process(&wsreq->xreq, ws->apiset);
 208 }
 209
 210 static void aws_on_push_cb(void *closure, const char *event, int eventid, struct json_object *object)
 211 {
 212         aws_on_broadcast_cb(closure, event, object);
 213 }
 214
 215 static void aws_on_broadcast_cb(void *closure, const char *event, struct json_object *object)
 216 {
 217         struct afb_ws_json1 *aws = closure;
 218         afb_wsj1_send_event_j(aws->wsj1, event, afb_msg_json_event(event, object));
 219 }
 220
 221 /***************************************************************
 222 ****************************************************************
 223 **
 224 **  functions of wsreq / afb_req
 225 **
 226 ****************************************************************
 227 ***************************************************************/
 228
 229 static void wsreq_destroy(struct afb_xreq *xreq)
 230 {
 231         struct afb_wsreq *wsreq = CONTAINER_OF_XREQ(struct afb_wsreq, xreq);
 232
 233         afb_context_disconnect(&wsreq->xreq.context);
 234         afb_wsj1_msg_unref(wsreq->msgj1);
 235         afb_cred_unref(wsreq->xreq.cred);
 236         afb_ws_json1_unref(wsreq->aws);
 237         free(wsreq);
 238 }
 239
 240 static void wsreq_reply(struct afb_xreq *xreq, struct json_object *object, const char *error, const char *info)
 241 {
 242         struct afb_wsreq *wsreq = CONTAINER_OF_XREQ(struct afb_wsreq, xreq);
 243         int rc;
 244         struct json_object *reply;
 245
 246         /* create the reply */
 247         reply = afb_msg_json_reply(object, error, info, &xreq->context);
 248
 249         rc = (error ? afb_wsj1_reply_error_j : afb_wsj1_reply_ok_j)(
 250                         wsreq->msgj1, reply, afb_context_sent_token(&wsreq->xreq.context));
 251         if (rc)
 252                 ERROR("Can't send reply: %m");
 253 }
 254