src/afb-ws-json1.c

   1 /*
   2  * Copyright (C) 2016 "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-msg-json.h"
  33 #include "session.h"
  34 #include "afb-apis.h"
  35 #include "afb-context.h"
  36 #include "afb-evt.h"
  37 #include "afb-subcall.h"
  38 #include "verbose.h"
  39
  40 static void aws_on_hangup(struct afb_ws_json1 *ws, struct afb_wsj1 *wsj1);
  41 static void aws_on_call(struct afb_ws_json1 *ws, const char *api, const char *verb, struct afb_wsj1_msg *msg);
  42
  43 static struct afb_wsj1_itf wsj1_itf = {
  44         .on_hangup = (void*)aws_on_hangup,
  45         .on_call = (void*)aws_on_call
  46 };
  47
  48 struct afb_wsreq;
  49
  50 struct afb_ws_json1
  51 {
  52         int refcount;
  53         void (*cleanup)(void*);
  54         void *cleanup_closure;
  55         struct AFB_clientCtx *session;
  56         struct afb_evt_listener *listener;
  57         struct afb_wsj1 *wsj1;
  58         int new_session;
  59 };
  60
  61 static void aws_send_event(struct afb_ws_json1 *ws, const char *event, struct json_object *object);
  62
  63 struct afb_ws_json1 *afb_ws_json1_create(int fd, struct afb_context *context, void (*cleanup)(void*), void *cleanup_closure)
  64 {
  65         struct afb_ws_json1 *result;
  66
  67         assert(fd >= 0);
  68         assert(context != NULL);
  69
  70         result = malloc(sizeof * result);
  71         if (result == NULL)
  72                 goto error;
  73
  74         result->refcount = 1;
  75         result->cleanup = cleanup;
  76         result->cleanup_closure = cleanup_closure;
  77         result->session = ctxClientAddRef(context->session);
  78         result->new_session = context->created != 0;
  79         if (result->session == NULL)
  80                 goto error2;
  81
  82         result->wsj1 = afb_wsj1_create(fd, &wsj1_itf, result);
  83         if (result->wsj1 == NULL)
  84                 goto error3;
  85
  86         result->listener = afb_evt_listener_create((void*)aws_send_event, result);
  87         if (result->listener == NULL)
  88                 goto error4;
  89
  90         return result;
  91
  92 error4:
  93         afb_wsj1_unref(result->wsj1);
  94 error3:
  95         ctxClientUnref(result->session);
  96 error2:
  97         free(result);
  98 error:
  99         close(fd);
 100         return NULL;
 101 }
 102
 103 static struct afb_ws_json1 *aws_addref(struct afb_ws_json1 *ws)
 104 {
 105         ws->refcount++;
 106         return ws;
 107 }
 108
 109 static void aws_unref(struct afb_ws_json1 *ws)
 110 {
 111         if (--ws->refcount == 0) {
 112                 afb_evt_listener_unref(ws->listener);
 113                 afb_wsj1_unref(ws->wsj1);
 114                 if (ws->cleanup != NULL)
 115                         ws->cleanup(ws->cleanup_closure);
 116                 ctxClientUnref(ws->session);
 117                 free(ws);
 118         }
 119 }
 120
 121 static void aws_on_hangup(struct afb_ws_json1 *ws, struct afb_wsj1 *wsj1)
 122 {
 123         aws_unref(ws);
 124 }
 125
 126 struct afb_wsreq
 127 {
 128         /*
 129          * CAUTION: 'context' field should be the first because there
 130          * is an implicit convertion to struct afb_context
 131          */
 132         struct afb_context context;
 133         int refcount;
 134         struct afb_ws_json1 *aws;
 135         struct afb_wsreq *next;
 136         struct afb_wsj1_msg *msgj1;
 137 };
 138
 139 static void wsreq_addref(struct afb_wsreq *wsreq);
 140 static void wsreq_unref(struct afb_wsreq *wsreq);
 141 static struct json_object *wsreq_json(struct afb_wsreq *wsreq);
 142 static struct afb_arg wsreq_get(struct afb_wsreq *wsreq, const char *name);
 143 static void wsreq_fail(struct afb_wsreq *wsreq, const char *status, const char *info);
 144 static void wsreq_success(struct afb_wsreq *wsreq, struct json_object *obj, const char *info);
 145 static const char *wsreq_raw(struct afb_wsreq *wsreq, size_t *size);
 146 static void wsreq_send(struct afb_wsreq *wsreq, const char *buffer, size_t size);
 147 static int wsreq_subscribe(struct afb_wsreq *wsreq, struct afb_event event);
 148 static int wsreq_unsubscribe(struct afb_wsreq *wsreq, struct afb_event event);
 149 static void wsreq_subcall(struct afb_wsreq *wsreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *closure);
 150
 151 const struct afb_req_itf afb_ws_json1_req_itf = {
 152         .json = (void*)wsreq_json,
 153         .get = (void*)wsreq_get,
 154         .success = (void*)wsreq_success,
 155         .fail = (void*)wsreq_fail,
 156         .raw = (void*)wsreq_raw,
 157         .send = (void*)wsreq_send,
 158         .context_get = (void*)afb_context_get,
 159         .context_set = (void*)afb_context_set,
 160         .addref = (void*)wsreq_addref,
 161         .unref = (void*)wsreq_unref,
 162         .session_close = (void*)afb_context_close,
 163         .session_set_LOA = (void*)afb_context_change_loa,
 164         .subscribe = (void*)wsreq_subscribe,
 165         .unsubscribe = (void*)wsreq_unsubscribe,
 166         .subcall = (void*)wsreq_subcall
 167 };
 168
 169 static void aws_on_call(struct afb_ws_json1 *ws, const char *api, const char *verb, struct afb_wsj1_msg *msg)
 170 {
 171         struct afb_req r;
 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_context_init(&wsreq->context, ws->session, afb_wsj1_msg_token(msg));
 185         if (!wsreq->context.invalidated)
 186                 wsreq->context.validated = 1;
 187         if (ws->new_session != 0) {
 188                 wsreq->context.created = 1;
 189                 ws->new_session = 0;
 190         }
 191
 192         /* fill and record the request */
 193         afb_wsj1_msg_addref(msg);
 194         wsreq->msgj1 = msg;
 195         wsreq->refcount = 1;
 196         wsreq->aws = aws_addref(ws);
 197
 198         /* emits the call */
 199         r.closure = wsreq;
 200         r.itf = &afb_ws_json1_req_itf;
 201         afb_apis_call_(r, &wsreq->context, api, verb);
 202         wsreq_unref(wsreq);
 203 }
 204
 205 static void wsreq_addref(struct afb_wsreq *wsreq)
 206 {
 207         wsreq->refcount++;
 208 }
 209
 210 static void wsreq_unref(struct afb_wsreq *wsreq)
 211 {
 212         if (--wsreq->refcount == 0) {
 213                 afb_context_disconnect(&wsreq->context);
 214                 afb_wsj1_msg_unref(wsreq->msgj1);
 215                 aws_unref(wsreq->aws);
 216                 free(wsreq);
 217         }
 218 }
 219
 220 static struct json_object *wsreq_json(struct afb_wsreq *wsreq)
 221 {
 222         return afb_wsj1_msg_object_j(wsreq->msgj1);
 223 }
 224
 225 static struct afb_arg wsreq_get(struct afb_wsreq *wsreq, const char *name)
 226 {
 227         struct afb_arg arg;
 228         struct json_object *value, *root;
 229
 230         root = wsreq_json(wsreq);
 231         if (json_object_object_get_ex(root, name, &value)) {
 232                 arg.name = name;
 233                 arg.value = json_object_get_string(value);
 234         } else {
 235                 arg.name = NULL;
 236                 arg.value = NULL;
 237         }
 238         arg.path = NULL;
 239         return arg;
 240 }
 241
 242 static void wsreq_fail(struct afb_wsreq *wsreq, const char *status, const char *info)
 243 {
 244         int rc;
 245         rc = afb_wsj1_reply_error_j(wsreq->msgj1, afb_msg_json_reply_error(status, info, &wsreq->context, NULL), afb_context_sent_token(&wsreq->context));
 246         if (rc)
 247                 ERROR("Can't send fail reply: %m");
 248 }
 249
 250 static void wsreq_success(struct afb_wsreq *wsreq, json_object *obj, const char *info)
 251 {
 252         int rc;
 253         rc = afb_wsj1_reply_ok_j(wsreq->msgj1, afb_msg_json_reply_ok(info, obj, &wsreq->context, NULL), afb_context_sent_token(&wsreq->context));
 254         if (rc)
 255                 ERROR("Can't send success reply: %m");
 256 }
 257
 258 static const char *wsreq_raw(struct afb_wsreq *wsreq, size_t *size)
 259 {
 260         const char *result = afb_wsj1_msg_object_s(wsreq->msgj1);
 261         if (size != NULL)
 262                 *size = strlen(result);
 263         return result;
 264 }
 265
 266 static void wsreq_send(struct afb_wsreq *wsreq, const char *buffer, size_t size)
 267 {
 268         int rc;
 269         rc = afb_wsj1_reply_ok_s(wsreq->msgj1, buffer, afb_context_sent_token(&wsreq->context));
 270         if (rc)
 271                 ERROR("Can't send raw reply: %m");
 272 }
 273
 274 static void aws_send_event(struct afb_ws_json1 *aws, const char *event, struct json_object *object)
 275 {
 276         afb_wsj1_send_event_j(aws->wsj1, event, afb_msg_json_event(event, object));
 277 }
 278
 279 static int wsreq_subscribe(struct afb_wsreq *wsreq, struct afb_event event)
 280 {
 281         return afb_evt_add_watch(wsreq->aws->listener, event);
 282 }
 283
 284 static int wsreq_unsubscribe(struct afb_wsreq *wsreq, struct afb_event event)
 285 {
 286         return afb_evt_remove_watch(wsreq->aws->listener, event);
 287 }
 288
 289 static void wsreq_subcall(struct afb_wsreq *wsreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *closure)
 290 {
 291         afb_subcall(&wsreq->context, api, verb, args, callback, closure, (struct afb_req){ .itf = &afb_ws_json1_req_itf, .closure = wsreq });
 292 }
 293