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