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-apis.h"
  36 #include "afb-xreq.h"
  37 #include "afb-context.h"
  38 #include "afb-evt.h"
  39 #include "afb-subcall.h"
  40 #include "verbose.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(struct afb_ws_json1 *ws, struct afb_wsj1 *wsj1);
  48 static void aws_on_call(struct afb_ws_json1 *ws, const char *api, const char *verb, struct afb_wsj1_msg *msg);
  49 static void aws_on_event(struct afb_ws_json1 *ws, const char *event, int eventid, struct json_object *object);
  50
  51 /* predeclaration of wsreq callbacks */
  52 static void wsreq_destroy(struct afb_wsreq *wsreq);
  53 static struct json_object *wsreq_json(struct afb_wsreq *wsreq);
  54 static void wsreq_reply(struct afb_wsreq *wsreq, int iserror, json_object *obj);
  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         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         .json = (void*)wsreq_json,
  86         .reply = (void*)wsreq_reply,
  87         .unref = (void*)wsreq_destroy
  88 };
  89
  90 /* the interface for events */
  91 static const struct afb_evt_itf evt_itf = {
  92         .broadcast = (void*)aws_on_event,
  93         .push = (void*)aws_on_event
  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(int fd, struct afb_context *context, void (*cleanup)(void*), void *cleanup_closure)
 105 {
 106         struct afb_ws_json1 *result;
 107
 108         assert(fd >= 0);
 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(afb_common_get_event_loop(), fd, &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         return result;
 132
 133 error4:
 134         afb_wsj1_unref(result->wsj1);
 135 error3:
 136         afb_session_unref(result->session);
 137 error2:
 138         free(result);
 139 error:
 140         close(fd);
 141         return NULL;
 142 }
 143
 144 static struct afb_ws_json1 *aws_addref(struct afb_ws_json1 *ws)
 145 {
 146         ws->refcount++;
 147         return ws;
 148 }
 149
 150 static void aws_unref(struct afb_ws_json1 *ws)
 151 {
 152         if (--ws->refcount == 0) {
 153                 afb_evt_listener_unref(ws->listener);
 154                 afb_wsj1_unref(ws->wsj1);
 155                 if (ws->cleanup != NULL)
 156                         ws->cleanup(ws->cleanup_closure);
 157                 afb_session_unref(ws->session);
 158                 free(ws);
 159         }
 160 }
 161
 162 static void aws_on_hangup(struct afb_ws_json1 *ws, struct afb_wsj1 *wsj1)
 163 {
 164         aws_unref(ws);
 165 }
 166
 167 static void aws_on_call(struct afb_ws_json1 *ws, const char *api, const char *verb, struct afb_wsj1_msg *msg)
 168 {
 169         struct afb_wsreq *wsreq;
 170
 171         DEBUG("received websocket request for %s/%s: %s", api, verb, afb_wsj1_msg_object_s(msg));
 172
 173         /* allocate */
 174         wsreq = calloc(1, sizeof *wsreq);
 175         if (wsreq == NULL) {
 176                 afb_wsj1_close(ws->wsj1, 1008, NULL);
 177                 return;
 178         }
 179
 180         /* init the context */
 181         afb_context_init(&wsreq->xreq.context, ws->session, afb_wsj1_msg_token(msg));
 182         if (!wsreq->xreq.context.invalidated)
 183                 wsreq->xreq.context.validated = 1;
 184         if (ws->new_session != 0) {
 185                 wsreq->xreq.context.created = 1;
 186                 ws->new_session = 0;
 187         }
 188
 189         /* fill and record the request */
 190         afb_wsj1_msg_addref(msg);
 191         wsreq->msgj1 = msg;
 192         wsreq->xreq.refcount = 1;
 193         wsreq->xreq.query = wsreq;
 194         wsreq->xreq.queryitf = &afb_ws_json1_xreq_itf;
 195         wsreq->xreq.api = api;
 196         wsreq->xreq.verb = verb;
 197         wsreq->aws = aws_addref(ws);
 198         wsreq->xreq.listener = wsreq->aws->listener;
 199
 200         /* emits the call */
 201         afb_apis_call(&wsreq->xreq);
 202         afb_xreq_unref(&wsreq->xreq);
 203 }
 204
 205 static void aws_on_event(struct afb_ws_json1 *aws, const char *event, int eventid, struct json_object *object)
 206 {
 207         afb_wsj1_send_event_j(aws->wsj1, event, afb_msg_json_event(event, object));
 208 }
 209
 210 /***************************************************************
 211 ****************************************************************
 212 **
 213 **  functions of wsreq / afb_req
 214 **
 215 ****************************************************************
 216 ***************************************************************/
 217
 218 static void wsreq_destroy(struct afb_wsreq *wsreq)
 219 {
 220         afb_context_disconnect(&wsreq->xreq.context);
 221         afb_wsj1_msg_unref(wsreq->msgj1);
 222         aws_unref(wsreq->aws);
 223         free(wsreq);
 224 }
 225
 226 static struct json_object *wsreq_json(struct afb_wsreq *wsreq)
 227 {
 228         return afb_wsj1_msg_object_j(wsreq->msgj1);
 229 }
 230
 231 static void wsreq_reply(struct afb_wsreq *wsreq, int iserror, json_object *obj)
 232 {
 233         int rc;
 234         rc = (iserror ? afb_wsj1_reply_error_j : afb_wsj1_reply_ok_j)(
 235                         wsreq->msgj1, obj, afb_context_sent_token(&wsreq->xreq.context));
 236         if (rc)
 237                 ERROR("Can't send reply: %m (was %s)", json_object_get_string(obj));
 238 }
 239