src/afb-ws-json1.c

   1 /*
   2  * Copyright (C) 2016-2019 "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-msg-json.h"
  31 #include "afb-session.h"
  32 #include "afb-cred.h"
  33 #include "afb-apiset.h"
  34 #include "afb-xreq.h"
  35 #include "afb-context.h"
  36 #include "afb-evt.h"
  37
  38 #include "systemd.h"
  39 #include "verbose.h"
  40 #include "fdev.h"
  41
  42 /* predeclaration of structures */
  43 struct afb_ws_json1;
  44 struct afb_wsreq;
  45
  46 /* predeclaration of websocket callbacks */
  47 static void aws_on_hangup_cb(void *closure, struct afb_wsj1 *wsj1);
  48 static void aws_on_call_cb(void *closure, const char *api, const char *verb, struct afb_wsj1_msg *msg);
  49 static void aws_on_push_cb(void *closure, const char *event, int eventid, struct json_object *object);
  50 static void aws_on_broadcast_cb(void *closure, const char *event, struct json_object *object);
  51
  52 /* predeclaration of wsreq callbacks */
  53 static void wsreq_destroy(struct afb_xreq *xreq);
  54 static void wsreq_reply(struct afb_xreq *xreq, struct json_object *object, const char *error, const char *info);
  55
  56 /* declaration of websocket structure */
  57 struct afb_ws_json1
  58 {
  59         int refcount;
  60         void (*cleanup)(void*);
  61         void *cleanup_closure;
  62         struct afb_session *session;
  63         struct afb_evt_listener *listener;
  64         struct afb_wsj1 *wsj1;
  65         struct afb_cred *cred;
  66         struct afb_apiset *apiset;
  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 = aws_on_hangup_cb,
  82         .on_call = aws_on_call_cb
  83 };
  84
  85 /* interface for xreq */
  86 const struct afb_xreq_query_itf afb_ws_json1_xreq_itf = {
  87         .reply = wsreq_reply,
  88         .unref = wsreq_destroy
  89 };
  90
  91 /* the interface for events */
  92 static const struct afb_evt_itf evt_itf = {
  93         .broadcast = aws_on_broadcast_cb,
  94         .push = aws_on_push_cb
  95 };
  96
  97 /***************************************************************
  98 ****************************************************************
  99 **
 100 **  functions of afb_ws_json1 / afb_wsj1
 101 **
 102 ****************************************************************
 103 ***************************************************************/
 104
 105 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)
 106 {
 107         struct afb_ws_json1 *result;
 108
 109         assert(fdev);
 110         assert(context != NULL);
 111
 112         result = malloc(sizeof * result);
 113         if (result == NULL)
 114                 goto error;
 115
 116         result->refcount = 1;
 117         result->cleanup = cleanup;
 118         result->cleanup_closure = cleanup_closure;
 119         result->session = afb_session_addref(context->session);
 120         result->new_session = context->created != 0;
 121         if (result->session == NULL)
 122                 goto error2;
 123
 124         result->wsj1 = afb_wsj1_create(fdev, &wsj1_itf, result);
 125         if (result->wsj1 == NULL)
 126                 goto error3;
 127
 128         result->listener = afb_evt_listener_create(&evt_itf, result);
 129         if (result->listener == NULL)
 130                 goto error4;
 131
 132         result->cred = afb_cred_create_for_socket(fdev_fd(fdev));
 133         result->apiset = afb_apiset_addref(apiset);
 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         fdev_unref(fdev);
 144         return NULL;
 145 }
 146
 147 struct afb_ws_json1 *afb_ws_json1_addref(struct afb_ws_json1 *ws)
 148 {
 149         __atomic_add_fetch(&ws->refcount, 1, __ATOMIC_RELAXED);
 150         return ws;
 151 }
 152
 153 void afb_ws_json1_unref(struct afb_ws_json1 *ws)
 154 {
 155         if (!__atomic_sub_fetch(&ws->refcount, 1, __ATOMIC_RELAXED)) {
 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                 afb_apiset_unref(ws->apiset);
 163                 free(ws);
 164         }
 165 }
 166
 167 static void aws_on_hangup_cb(void *closure, struct afb_wsj1 *wsj1)
 168 {
 169         struct afb_ws_json1 *ws = closure;
 170         afb_ws_json1_unref(ws);
 171 }
 172
 173 static void aws_on_call_cb(void *closure, const char *api, const char *verb, struct afb_wsj1_msg *msg)
 174 {
 175         struct afb_ws_json1 *ws = closure;
 176         struct afb_wsreq *wsreq;
 177
 178         DEBUG("received websocket request for %s/%s: %s", api, verb, afb_wsj1_msg_object_s(msg));
 179
 180         /* allocate */
 181         wsreq = calloc(1, sizeof *wsreq);
 182         if (wsreq == NULL) {
 183                 afb_wsj1_close(ws->wsj1, 1008, NULL);
 184                 return;
 185         }
 186
 187         /* init the context */
 188         afb_xreq_init(&wsreq->xreq, &afb_ws_json1_xreq_itf);
 189         afb_context_init(&wsreq->xreq.context, ws->session, afb_wsj1_msg_token(msg));
 190         if (!wsreq->xreq.context.invalidated)
 191                 wsreq->xreq.context.validated = 1;
 192         if (ws->new_session != 0) {
 193                 wsreq->xreq.context.created = 1;
 194                 ws->new_session = 0;
 195         }
 196
 197         /* fill and record the request */
 198         afb_wsj1_msg_addref(msg);
 199         wsreq->msgj1 = msg;
 200         wsreq->xreq.cred = afb_cred_addref(ws->cred);
 201         wsreq->xreq.request.called_api = api;
 202         wsreq->xreq.request.called_verb = verb;
 203         wsreq->xreq.json = afb_wsj1_msg_object_j(wsreq->msgj1);
 204         wsreq->aws = afb_ws_json1_addref(ws);
 205         wsreq->xreq.listener = wsreq->aws->listener;
 206
 207         /* emits the call */
 208         afb_xreq_process(&wsreq->xreq, ws->apiset);
 209 }
 210
 211 static void aws_on_push_cb(void *closure, const char *event, int eventid, struct json_object *object)
 212 {
 213         aws_on_broadcast_cb(closure, event, object);
 214 }
 215
 216 static void aws_on_broadcast_cb(void *closure, const char *event, struct json_object *object)
 217 {
 218         struct afb_ws_json1 *aws = closure;
 219         afb_wsj1_send_event_j(aws->wsj1, event, afb_msg_json_event(event, object));
 220 }
 221
 222 /***************************************************************
 223 ****************************************************************
 224 **
 225 **  functions of wsreq / afb_req
 226 **
 227 ****************************************************************
 228 ***************************************************************/
 229
 230 static void wsreq_destroy(struct afb_xreq *xreq)
 231 {
 232         struct afb_wsreq *wsreq = CONTAINER_OF_XREQ(struct afb_wsreq, xreq);
 233
 234         afb_context_disconnect(&wsreq->xreq.context);
 235         afb_wsj1_msg_unref(wsreq->msgj1);
 236         afb_cred_unref(wsreq->xreq.cred);
 237         afb_ws_json1_unref(wsreq->aws);
 238         free(wsreq);
 239 }
 240
 241 static void wsreq_reply(struct afb_xreq *xreq, struct json_object *object, const char *error, const char *info)
 242 {
 243         struct afb_wsreq *wsreq = CONTAINER_OF_XREQ(struct afb_wsreq, xreq);
 244         int rc;
 245         struct json_object *reply;
 246
 247         /* create the reply */
 248         reply = afb_msg_json_reply(object, error, info, &xreq->context);
 249
 250         rc = (error ? afb_wsj1_reply_error_j : afb_wsj1_reply_ok_j)(
 251                         wsreq->msgj1, reply, afb_context_sent_token(&wsreq->xreq.context));
 252         if (rc)
 253                 ERROR("Can't send reply: %m");
 254 }
 255