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 #include "afb-token.h"
  38
  39 #include "systemd.h"
  40 #include "verbose.h"
  41 #include "fdev.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_cb(void *closure, struct afb_wsj1 *wsj1);
  49 static void aws_on_call_cb(void *closure, const char *api, const char *verb, struct afb_wsj1_msg *msg);
  50 static void aws_on_push_cb(void *closure, const char *event, uint16_t eventid, struct json_object *object);
  51 static void aws_on_broadcast_cb(void *closure, const char *event, struct json_object *object, const uuid_binary_t uuid, uint8_t hop);
  52
  53 /* predeclaration of wsreq callbacks */
  54 static void wsreq_destroy(struct afb_xreq *xreq);
  55 static void wsreq_reply(struct afb_xreq *xreq, struct json_object *object, const char *error, const char *info);
  56 static int wsreq_subscribe(struct afb_xreq *xreq, struct afb_event_x2 *event);
  57 static int wsreq_unsubscribe(struct afb_xreq *xreq, struct afb_event_x2 *event);
  58
  59 /* declaration of websocket structure */
  60 struct afb_ws_json1
  61 {
  62         int refcount;
  63         void (*cleanup)(void*);
  64         void *cleanup_closure;
  65         struct afb_session *session;
  66         struct afb_token *token;
  67         struct afb_evt_listener *listener;
  68         struct afb_wsj1 *wsj1;
  69         struct afb_cred *cred;
  70         struct afb_apiset *apiset;
  71 };
  72
  73 /* declaration of wsreq structure */
  74 struct afb_wsreq
  75 {
  76         struct afb_xreq xreq;
  77         struct afb_ws_json1 *aws;
  78         struct afb_wsreq *next;
  79         struct afb_wsj1_msg *msgj1;
  80 };
  81
  82 /* interface for afb_ws_json1 / afb_wsj1 */
  83 static struct afb_wsj1_itf wsj1_itf = {
  84         .on_hangup = aws_on_hangup_cb,
  85         .on_call = aws_on_call_cb
  86 };
  87
  88 /* interface for xreq */
  89 const struct afb_xreq_query_itf afb_ws_json1_xreq_itf = {
  90         .reply = wsreq_reply,
  91         .subscribe = wsreq_subscribe,
  92         .unsubscribe = wsreq_unsubscribe,
  93         .unref = wsreq_destroy
  94 };
  95
  96 /* the interface for events */
  97 static const struct afb_evt_itf evt_itf = {
  98         .broadcast = aws_on_broadcast_cb,
  99         .push = aws_on_push_cb
 100 };
 101
 102 /***************************************************************
 103 ****************************************************************
 104 **
 105 **  functions of afb_ws_json1 / afb_wsj1
 106 **
 107 ****************************************************************
 108 ***************************************************************/
 109
 110 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)
 111 {
 112         struct afb_ws_json1 *result;
 113
 114         assert(fdev);
 115         assert(context != NULL);
 116
 117         result = malloc(sizeof * result);
 118         if (result == NULL)
 119                 goto error;
 120
 121         result->refcount = 1;
 122         result->cleanup = cleanup;
 123         result->cleanup_closure = cleanup_closure;
 124         result->session = afb_session_addref(context->session);
 125         result->token = afb_token_addref(context->token);
 126         if (result->session == NULL)
 127                 goto error2;
 128
 129         result->wsj1 = afb_wsj1_create(fdev, &wsj1_itf, result);
 130         if (result->wsj1 == NULL)
 131                 goto error3;
 132
 133         result->listener = afb_evt_listener_create(&evt_itf, result);
 134         if (result->listener == NULL)
 135                 goto error4;
 136
 137         result->cred = afb_cred_create_for_socket(fdev_fd(fdev));
 138         result->apiset = afb_apiset_addref(apiset);
 139         return result;
 140
 141 error4:
 142         afb_wsj1_unref(result->wsj1);
 143 error3:
 144         afb_session_unref(result->session);
 145         afb_token_unref(result->token);
 146 error2:
 147         free(result);
 148 error:
 149         fdev_unref(fdev);
 150         return NULL;
 151 }
 152
 153 struct afb_ws_json1 *afb_ws_json1_addref(struct afb_ws_json1 *ws)
 154 {
 155         __atomic_add_fetch(&ws->refcount, 1, __ATOMIC_RELAXED);
 156         return ws;
 157 }
 158
 159 void afb_ws_json1_unref(struct afb_ws_json1 *ws)
 160 {
 161         if (!__atomic_sub_fetch(&ws->refcount, 1, __ATOMIC_RELAXED)) {
 162                 afb_evt_listener_unref(ws->listener);
 163                 afb_wsj1_unref(ws->wsj1);
 164                 if (ws->cleanup != NULL)
 165                         ws->cleanup(ws->cleanup_closure);
 166                 afb_token_unref(ws->token);
 167                 afb_session_unref(ws->session);
 168                 afb_cred_unref(ws->cred);
 169                 afb_apiset_unref(ws->apiset);
 170                 free(ws);
 171         }
 172 }
 173
 174 static void aws_on_hangup_cb(void *closure, struct afb_wsj1 *wsj1)
 175 {
 176         struct afb_ws_json1 *ws = closure;
 177         afb_ws_json1_unref(ws);
 178 }
 179
 180 static int aws_new_token(struct afb_ws_json1 *ws, const char *new_token_string)
 181 {
 182         int rc;
 183         struct afb_token *newtok, *oldtok;
 184
 185         rc = afb_token_get(&newtok, new_token_string);
 186         if (rc >= 0) {
 187                 oldtok = ws->token;
 188                 ws->token = newtok;
 189                 afb_token_unref(oldtok);
 190         }
 191         return rc;
 192 }
 193
 194 static void aws_on_call_cb(void *closure, const char *api, const char *verb, struct afb_wsj1_msg *msg)
 195 {
 196         struct afb_ws_json1 *ws = closure;
 197         struct afb_wsreq *wsreq;
 198         const char *tok;
 199
 200         DEBUG("received websocket request for %s/%s: %s", api, verb, afb_wsj1_msg_object_s(msg));
 201
 202         /* handle new tokens */
 203         tok = afb_wsj1_msg_token(msg);
 204         if (tok)
 205                 aws_new_token(ws, tok);
 206
 207         /* allocate */
 208         wsreq = calloc(1, sizeof *wsreq);
 209         if (wsreq == NULL) {
 210                 afb_wsj1_close(ws->wsj1, 1008, NULL);
 211                 return;
 212         }
 213
 214         /* init the context */
 215         afb_xreq_init(&wsreq->xreq, &afb_ws_json1_xreq_itf);
 216         afb_context_init(&wsreq->xreq.context, ws->session, ws->token, ws->cred);
 217
 218         /* fill and record the request */
 219         afb_wsj1_msg_addref(msg);
 220         wsreq->msgj1 = msg;
 221         wsreq->xreq.request.called_api = api;
 222         wsreq->xreq.request.called_verb = verb;
 223         wsreq->xreq.json = afb_wsj1_msg_object_j(wsreq->msgj1);
 224         wsreq->aws = afb_ws_json1_addref(ws);
 225
 226         /* emits the call */
 227         afb_xreq_process(&wsreq->xreq, ws->apiset);
 228 }
 229
 230 static void aws_on_event(struct afb_ws_json1 *aws, const char *event, struct json_object *object)
 231 {
 232         afb_wsj1_send_event_j(aws->wsj1, event, afb_msg_json_event(event, object));
 233 }
 234
 235 static void aws_on_push_cb(void *closure, const char *event, uint16_t eventid, struct json_object *object)
 236 {
 237         aws_on_event(closure, event, object);
 238 }
 239
 240 static void aws_on_broadcast_cb(void *closure, const char *event, struct json_object *object, const uuid_binary_t uuid, uint8_t hop)
 241 {
 242         aws_on_event(closure, event, afb_msg_json_event(event, object));
 243 }
 244
 245 /***************************************************************
 246 ****************************************************************
 247 **
 248 **  functions of wsreq / afb_req
 249 **
 250 ****************************************************************
 251 ***************************************************************/
 252
 253 static void wsreq_destroy(struct afb_xreq *xreq)
 254 {
 255         struct afb_wsreq *wsreq = CONTAINER_OF_XREQ(struct afb_wsreq, xreq);
 256
 257         afb_context_disconnect(&wsreq->xreq.context);
 258         afb_wsj1_msg_unref(wsreq->msgj1);
 259         afb_ws_json1_unref(wsreq->aws);
 260         free(wsreq);
 261 }
 262
 263 static void wsreq_reply(struct afb_xreq *xreq, struct json_object *object, const char *error, const char *info)
 264 {
 265         struct afb_wsreq *wsreq = CONTAINER_OF_XREQ(struct afb_wsreq, xreq);
 266         int rc;
 267         struct json_object *reply;
 268
 269         /* create the reply */
 270         reply = afb_msg_json_reply(object, error, info, &xreq->context);
 271
 272         rc = (error ? afb_wsj1_reply_error_j : afb_wsj1_reply_ok_j)(
 273                         wsreq->msgj1, reply, NULL);
 274         if (rc)
 275                 ERROR("Can't send reply: %m");
 276 }
 277
 278 static int wsreq_subscribe(struct afb_xreq *xreq, struct afb_event_x2 *event)
 279 {
 280         struct afb_wsreq *wsreq = CONTAINER_OF_XREQ(struct afb_wsreq, xreq);
 281
 282         return afb_evt_listener_watch_x2(wsreq->aws->listener, event);
 283 }
 284
 285 static int wsreq_unsubscribe(struct afb_xreq *xreq, struct afb_event_x2 *event)
 286 {
 287         struct afb_wsreq *wsreq = CONTAINER_OF_XREQ(struct afb_wsreq, xreq);
 288
 289         return afb_evt_listener_unwatch_x2(wsreq->aws->listener, event);
 290 }
 291