src/afb-stub-ws.c

   1 /*
   2  * Copyright (C) 2015-2020 "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 <string.h>
  22 #include <assert.h>
  23 #include <fcntl.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <endian.h>
  27 #include <netdb.h>
  28 #include <sys/types.h>
  29 #include <sys/socket.h>
  30 #include <sys/un.h>
  31 #include <pthread.h>
  32
  33 #include <json-c/json.h>
  34
  35 #include <afb/afb-event-x2.h>
  36
  37 #include "afb-session.h"
  38 #include "afb-cred.h"
  39 #include "afb-api.h"
  40 #include "afb-apiset.h"
  41 #include "afb-proto-ws.h"
  42 #include "afb-stub-ws.h"
  43 #include "afb-context.h"
  44 #include "afb-evt.h"
  45 #include "afb-xreq.h"
  46 #include "afb-token.h"
  47 #include "afb-error-text.h"
  48 #include "verbose.h"
  49 #include "fdev.h"
  50 #include "jobs.h"
  51 #include "u16id.h"
  52
  53 struct afb_stub_ws;
  54
  55 /**
  56  * structure for a ws request: requests on server side
  57  */
  58 struct server_req {
  59         struct afb_xreq xreq;           /**< the xreq */
  60         struct afb_stub_ws *stubws;     /**< the client of the request */
  61         struct afb_proto_ws_call *call; /**< the incoming call */
  62 };
  63
  64 /**
  65  * structure for jobs of describing
  66  */
  67 struct server_describe
  68 {
  69         struct afb_stub_ws *stubws;
  70         struct afb_proto_ws_describe *describe;
  71 };
  72
  73 /******************* stub description for client or servers ******************/
  74
  75 struct afb_stub_ws
  76 {
  77         /* protocol */
  78         struct afb_proto_ws *proto;
  79
  80         /* apiset */
  81         struct afb_apiset *apiset;
  82
  83         /* on hangup callback */
  84         void (*on_hangup)(struct afb_stub_ws *);
  85
  86         union {
  87                 /* server side */
  88                 struct {
  89                         /* listener for events */
  90                         struct afb_evt_listener *listener;
  91
  92                         /* sessions */
  93                         struct server_session *sessions;
  94
  95                         /* credentials of the client */
  96                         struct afb_cred *cred;
  97
  98                         /* event from server */
  99                         struct u16id2bool *event_flags;
 100
 101                         /* transmitted sessions */
 102                         struct u16id2ptr *session_proxies;
 103
 104                         /* transmitted tokens */
 105                         struct u16id2ptr *token_proxies;
 106                 };
 107
 108                 /* client side */
 109                 struct {
 110                         /* event from server */
 111                         struct u16id2ptr *event_proxies;
 112
 113                         /* transmitted sessions */
 114                         struct u16id2bool *session_flags;
 115
 116                         /* transmitted tokens */
 117                         struct u16id2bool *token_flags;
 118
 119                         /* robustify */
 120                         struct {
 121                                 struct fdev *(*reopen)(void*);
 122                                 void *closure;
 123                                 void (*release)(void*);
 124                         } robust;
 125                 };
 126         };
 127
 128         /* count of references */
 129         unsigned refcount;
 130
 131         /* type of the stub: 0=server, 1=client */
 132         uint8_t is_client;
 133
 134         /* the api name */
 135         char apiname[];
 136 };
 137
 138 static struct afb_proto_ws *afb_stub_ws_create_proto(struct afb_stub_ws *stubws, struct fdev *fdev, uint8_t server);
 139
 140 /******************* ws request part for server *****************/
 141
 142 /* decrement the reference count of the request and free/release it on falling to null */
 143 static void server_req_destroy_cb(struct afb_xreq *xreq)
 144 {
 145         struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq);
 146
 147         afb_context_disconnect(&wreq->xreq.context);
 148         json_object_put(wreq->xreq.json);
 149         afb_proto_ws_call_unref(wreq->call);
 150         afb_stub_ws_unref(wreq->stubws);
 151         free(wreq);
 152 }
 153
 154 static void server_req_reply_cb(struct afb_xreq *xreq, struct json_object *obj, const char *error, const char *info)
 155 {
 156         int rc;
 157         struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq);
 158
 159         rc = afb_proto_ws_call_reply(wreq->call, obj, error, info);
 160         if (rc < 0)
 161                 ERROR("error while sending reply");
 162         json_object_put(obj);
 163 }
 164
 165 static int server_req_subscribe_cb(struct afb_xreq *xreq, struct afb_event_x2 *event)
 166 {
 167         int rc;
 168         struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq);
 169
 170         rc = afb_evt_listener_watch_x2(wreq->stubws->listener, event);
 171         if (rc >= 0)
 172                 rc = afb_proto_ws_call_subscribe(wreq->call,  afb_evt_event_x2_id(event));
 173         if (rc < 0)
 174                 ERROR("error while subscribing event");
 175         return rc;
 176 }
 177
 178 static int server_req_unsubscribe_cb(struct afb_xreq *xreq, struct afb_event_x2 *event)
 179 {
 180         int rc;
 181         struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq);
 182
 183         rc = afb_proto_ws_call_unsubscribe(wreq->call,  afb_evt_event_x2_id(event));
 184         if (rc < 0)
 185                 ERROR("error while unsubscribing event");
 186         return rc;
 187 }
 188
 189 static const struct afb_xreq_query_itf server_req_xreq_itf = {
 190         .reply = server_req_reply_cb,
 191         .unref = server_req_destroy_cb,
 192         .subscribe = server_req_subscribe_cb,
 193         .unsubscribe = server_req_unsubscribe_cb
 194 };
 195
 196 /******************* client part **********************************/
 197
 198 static struct afb_proto_ws *client_get_proto(struct afb_stub_ws *stubws)
 199 {
 200         struct fdev *fdev;
 201         struct afb_proto_ws *proto;
 202
 203         proto = stubws->proto;
 204         if (proto == NULL && stubws->robust.reopen) {
 205                 fdev = stubws->robust.reopen(stubws->robust.closure);
 206                 if (fdev != NULL)
 207                         proto = afb_stub_ws_create_proto(stubws, fdev, 0);
 208         }
 209         return proto;
 210 }
 211
 212 static int client_make_ids(struct afb_stub_ws *stubws, struct afb_proto_ws *proto, struct afb_context *context, uint16_t *sessionid, uint16_t *tokenid)
 213 {
 214         int rc, rc2;
 215         uint16_t sid, tid;
 216
 217         rc = 0;
 218
 219         /* get the session */
 220         if (!context->session)
 221                 sid = 0;
 222         else {
 223                 sid = afb_session_id(context->session);
 224                 rc2 = u16id2bool_set(&stubws->session_flags, sid, 1);
 225                 if (rc2 < 0)
 226                         rc = rc2;
 227                 else if (rc2 == 0)
 228                         rc = afb_proto_ws_client_session_create(proto, sid, afb_session_uuid(context->session));
 229         }
 230
 231         /* get the token */
 232         if (!context->token)
 233                 tid = 0;
 234         else {
 235                 tid = afb_token_id(context->token);
 236                 rc2 = u16id2bool_set(&stubws->token_flags, tid, 1);
 237                 if (rc2 < 0)
 238                         rc = rc2;
 239                 else if (rc2 == 0) {
 240                         rc2 = afb_proto_ws_client_token_create(proto, tid, afb_token_string(context->token));
 241                         if (rc2 < 0)
 242                                 rc = rc2;
 243                 }
 244         }
 245
 246         *sessionid = sid;
 247         *tokenid = tid;
 248         return rc;
 249 }
 250
 251 /* on call, propagate it to the ws service */
 252 static void client_api_call_cb(void * closure, struct afb_xreq *xreq)
 253 {
 254         int rc;
 255         struct afb_stub_ws *stubws = closure;
 256         struct afb_proto_ws *proto;
 257         uint16_t sessionid;
 258         uint16_t tokenid;
 259
 260         proto = client_get_proto(stubws);
 261         if (proto == NULL) {
 262                 afb_xreq_reply(xreq, NULL, afb_error_text_disconnected, NULL);
 263                 return;
 264         }
 265
 266         rc = client_make_ids(stubws, proto, &xreq->context, &sessionid, &tokenid);
 267         if (rc >= 0) {
 268                 afb_xreq_unhooked_addref(xreq);
 269                 rc = afb_proto_ws_client_call(
 270                                 proto,
 271                                 xreq->request.called_verb,
 272                                 afb_xreq_json(xreq),
 273                                 sessionid,
 274                                 tokenid,
 275                                 xreq,
 276                                 xreq_on_behalf_cred_export(xreq));
 277         }
 278         if (rc < 0) {
 279                 afb_xreq_reply(xreq, NULL, afb_error_text_internal_error, "can't send message");
 280                 afb_xreq_unhooked_unref(xreq);
 281         }
 282 }
 283
 284 /* get the description */
 285 static void client_api_describe_cb(void * closure, void (*describecb)(void *, struct json_object *), void *clocb)
 286 {
 287         struct afb_stub_ws *stubws = closure;
 288         struct afb_proto_ws *proto;
 289
 290         proto = client_get_proto(stubws);
 291         if (proto)
 292                 afb_proto_ws_client_describe(proto, describecb, clocb);
 293         else
 294                 describecb(clocb, NULL);
 295 }
 296
 297 /******************* server part: manage events **********************************/
 298
 299 static void server_event_add_cb(void *closure, const char *event, uint16_t eventid)
 300 {
 301         int rc;
 302         struct afb_stub_ws *stubws = closure;
 303
 304         if (stubws->proto != NULL) {
 305                 rc = u16id2bool_set(&stubws->event_flags, eventid, 1);
 306                 if (rc == 0) {
 307                         rc = afb_proto_ws_server_event_create(stubws->proto, eventid, event);
 308                         if (rc < 0)
 309                                 u16id2bool_set(&stubws->event_flags, eventid, 0);
 310                 }
 311         }
 312 }
 313
 314 static void server_event_remove_cb(void *closure, const char *event, uint16_t eventid)
 315 {
 316         struct afb_stub_ws *stubws = closure;
 317
 318         if (stubws->proto != NULL) {
 319                 if (u16id2bool_set(&stubws->event_flags, eventid, 0))
 320                         afb_proto_ws_server_event_remove(stubws->proto, eventid);
 321         }
 322 }
 323
 324 static void server_event_push_cb(void *closure, const char *event, uint16_t eventid, struct json_object *object)
 325 {
 326         struct afb_stub_ws *stubws = closure;
 327
 328         if (stubws->proto != NULL && u16id2bool_get(stubws->event_flags, eventid))
 329                 afb_proto_ws_server_event_push(stubws->proto, eventid, object);
 330         json_object_put(object);
 331 }
 332
 333 static void server_event_broadcast_cb(void *closure, const char *event, struct json_object *object, const uuid_binary_t uuid, uint8_t hop)
 334 {
 335         struct afb_stub_ws *stubws = closure;
 336
 337         if (stubws->proto != NULL)
 338                 afb_proto_ws_server_event_broadcast(stubws->proto, event, object, uuid, hop);
 339         json_object_put(object);
 340 }
 341
 342 /*****************************************************/
 343
 344 static void client_on_reply_cb(void *closure, void *request, struct json_object *object, const char *error, const char *info)
 345 {
 346         struct afb_xreq *xreq = request;
 347
 348         afb_xreq_reply(xreq, object, error, info);
 349         afb_xreq_unhooked_unref(xreq);
 350 }
 351
 352 static void client_on_event_create_cb(void *closure, uint16_t event_id, const char *event_name)
 353 {
 354         struct afb_stub_ws *stubws = closure;
 355         struct afb_event_x2 *event;
 356         int rc;
 357
 358         /* check conflicts */
 359         event = afb_evt_event_x2_create(event_name);
 360         if (event == NULL)
 361                 ERROR("can't create event %s, out of memory", event_name);
 362         else {
 363                 rc = u16id2ptr_add(&stubws->event_proxies, event_id, event);
 364                 if (rc < 0) {
 365                         ERROR("can't record event %s", event_name);
 366                         afb_evt_event_x2_unref(event);
 367                 }
 368         }
 369 }
 370
 371 static void client_on_event_remove_cb(void *closure, uint16_t event_id)
 372 {
 373         struct afb_stub_ws *stubws = closure;
 374         struct afb_event_x2 *event;
 375         int rc;
 376
 377         rc = u16id2ptr_drop(&stubws->event_proxies, event_id, (void**)&event);
 378         if (rc == 0 && event)
 379                 afb_evt_event_x2_unref(event);
 380 }
 381
 382 static void client_on_event_subscribe_cb(void *closure, void *request, uint16_t event_id)
 383 {
 384         struct afb_stub_ws *stubws = closure;
 385         struct afb_xreq *xreq = request;
 386         struct afb_event_x2 *event;
 387         int rc;
 388
 389         rc = u16id2ptr_get(stubws->event_proxies, event_id, (void**)&event);
 390         if (rc < 0 || !event || afb_xreq_subscribe(xreq, event) < 0)
 391                 ERROR("can't subscribe: %m");
 392 }
 393
 394 static void client_on_event_unsubscribe_cb(void *closure, void *request, uint16_t event_id)
 395 {
 396         struct afb_stub_ws *stubws = closure;
 397         struct afb_xreq *xreq = request;
 398         struct afb_event_x2 *event;
 399         int rc;
 400
 401         rc = u16id2ptr_get(stubws->event_proxies, event_id, (void**)&event);
 402         if (rc < 0 || !event || afb_xreq_unsubscribe(xreq, event) < 0)
 403                 ERROR("can't unsubscribe: %m");
 404 }
 405
 406 static void client_on_event_push_cb(void *closure, uint16_t event_id, struct json_object *data)
 407 {
 408         struct afb_stub_ws *stubws = closure;
 409         struct afb_event_x2 *event;
 410         int rc;
 411
 412         rc = u16id2ptr_get(stubws->event_proxies, event_id, (void**)&event);
 413         if (rc >= 0 && event)
 414                 rc = afb_evt_event_x2_push(event, data);
 415         else
 416                 ERROR("unreadable push event");
 417         if (rc <= 0)
 418                 afb_proto_ws_client_event_unexpected(stubws->proto, event_id);
 419 }
 420
 421 static void client_on_event_broadcast_cb(void *closure, const char *event_name, struct json_object *data, const uuid_binary_t uuid, uint8_t hop)
 422 {
 423         afb_evt_rebroadcast(event_name, data, uuid, hop);
 424 }
 425
 426 /*****************************************************/
 427
 428 static struct afb_session *server_add_session(struct afb_stub_ws *stubws, uint16_t sessionid, const char *sessionstr)
 429 {
 430         struct afb_session *session;
 431         int rc, created;
 432
 433         session = afb_session_get(sessionstr, AFB_SESSION_TIMEOUT_DEFAULT, &created);
 434         if (session == NULL)
 435                 ERROR("can't create session %s, out of memory", sessionstr);
 436         else {
 437                 afb_session_set_autoclose(session, 1);
 438                 rc = u16id2ptr_add(&stubws->session_proxies, sessionid, session);
 439                 if (rc < 0) {
 440                         ERROR("can't record session %s", sessionstr);
 441                         afb_session_unref(session);
 442                         session = NULL;
 443                 }
 444         }
 445         return session;
 446 }
 447
 448 static void server_on_session_create_cb(void *closure, uint16_t sessionid, const char *sessionstr)
 449 {
 450         struct afb_stub_ws *stubws = closure;
 451
 452         server_add_session(stubws, sessionid, sessionstr);
 453 }
 454
 455 static void server_on_session_remove_cb(void *closure, uint16_t sessionid)
 456 {
 457         struct afb_stub_ws *stubws = closure;
 458         struct afb_session *session;
 459         int rc;
 460
 461         rc = u16id2ptr_drop(&stubws->event_proxies, sessionid, (void**)&session);
 462         if (rc == 0 && session)
 463                 afb_session_unref(session);
 464 }
 465
 466 static void server_on_token_create_cb(void *closure, uint16_t tokenid, const char *tokenstr)
 467 {
 468         struct afb_stub_ws *stubws = closure;
 469         struct afb_token *token;
 470         int rc;
 471
 472         rc = afb_token_get(&token, tokenstr);
 473         if (rc < 0)
 474                 ERROR("can't create token %s, out of memory", tokenstr);
 475         else {
 476                 rc = u16id2ptr_add(&stubws->token_proxies, tokenid, token);
 477                 if (rc < 0) {
 478                         ERROR("can't record token %s", tokenstr);
 479                         afb_token_unref(token);
 480                 }
 481         }
 482 }
 483
 484 static void server_on_token_remove_cb(void *closure, uint16_t tokenid)
 485 {
 486         struct afb_stub_ws *stubws = closure;
 487         struct afb_token *token;
 488         int rc;
 489
 490         rc = u16id2ptr_drop(&stubws->event_proxies, tokenid, (void**)&token);
 491         if (rc == 0 && token)
 492                 afb_token_unref(token);
 493 }
 494
 495 static void server_on_event_unexpected_cb(void *closure, uint16_t eventid)
 496 {
 497         struct afb_stub_ws *stubws = closure;
 498
 499         afb_evt_listener_unwatch_id(stubws->listener, eventid);
 500 }
 501
 502 static void server_on_call_cb(void *closure, struct afb_proto_ws_call *call, const char *verb, struct json_object *args, uint16_t sessionid, uint16_t tokenid, const char *user_creds)
 503 {
 504         struct afb_stub_ws *stubws = closure;
 505         struct server_req *wreq;
 506         struct afb_session *session;
 507         struct afb_token *token;
 508         int rc;
 509
 510         afb_stub_ws_addref(stubws);
 511
 512         /* get tokens and sessions */
 513         rc = u16id2ptr_get(stubws->session_proxies, sessionid, (void**)&session);
 514         if (rc < 0) {
 515                 if (sessionid != 0)
 516                         goto no_session;
 517                 session = server_add_session(stubws, sessionid, NULL);
 518                 if (!session)
 519                         goto out_of_memory;
 520         }
 521         if (!tokenid || u16id2ptr_get(stubws->token_proxies, tokenid, (void**)&token) < 0)
 522                 token = NULL;
 523
 524         /* create the request */
 525         wreq = malloc(sizeof *wreq);
 526         if (wreq == NULL)
 527                 goto out_of_memory;
 528
 529         afb_xreq_init(&wreq->xreq, &server_req_xreq_itf);
 530         wreq->stubws = stubws;
 531         wreq->call = call;
 532
 533         /* init the context */
 534         afb_context_init(&wreq->xreq.context, session, token, stubws->cred);
 535         afb_context_on_behalf_import(&wreq->xreq.context, user_creds);
 536
 537         /* makes the call */
 538         wreq->xreq.request.called_api = stubws->apiname;
 539         wreq->xreq.request.called_verb = verb;
 540         wreq->xreq.json = args;
 541         afb_xreq_process(&wreq->xreq, stubws->apiset);
 542         return;
 543
 544 out_of_memory:
 545 no_session:
 546         json_object_put(args);
 547         afb_stub_ws_unref(stubws);
 548         afb_proto_ws_call_reply(call, NULL, afb_error_text_internal_error, NULL);
 549         afb_proto_ws_call_unref(call);
 550 }
 551
 552 static void server_on_description_cb(void *closure, struct json_object *description)
 553 {
 554         struct afb_proto_ws_describe *describe = closure;
 555         afb_proto_ws_describe_put(describe, description);
 556         json_object_put(description);
 557 }
 558
 559
 560 static void server_on_describe_cb(void *closure, struct afb_proto_ws_describe *describe)
 561 {
 562         struct afb_stub_ws *stubws = closure;
 563
 564         afb_apiset_describe(stubws->apiset, stubws->apiname, server_on_description_cb, describe);
 565 }
 566
 567 /*****************************************************/
 568
 569 static const struct afb_proto_ws_client_itf client_itf =
 570 {
 571         .on_reply = client_on_reply_cb,
 572         .on_event_create = client_on_event_create_cb,
 573         .on_event_remove = client_on_event_remove_cb,
 574         .on_event_subscribe = client_on_event_subscribe_cb,
 575         .on_event_unsubscribe = client_on_event_unsubscribe_cb,
 576         .on_event_push = client_on_event_push_cb,
 577         .on_event_broadcast = client_on_event_broadcast_cb,
 578 };
 579
 580 static struct afb_api_itf client_api_itf = {
 581         .call = client_api_call_cb,
 582         .describe = client_api_describe_cb
 583 };
 584
 585 static const struct afb_proto_ws_server_itf server_itf =
 586 {
 587         .on_session_create = server_on_session_create_cb,
 588         .on_session_remove = server_on_session_remove_cb,
 589         .on_token_create = server_on_token_create_cb,
 590         .on_token_remove = server_on_token_remove_cb,
 591         .on_call = server_on_call_cb,
 592         .on_describe = server_on_describe_cb,
 593         .on_event_unexpected = server_on_event_unexpected_cb
 594 };
 595
 596 /* the interface for events pushing */
 597 static const struct afb_evt_itf server_event_itf = {
 598         .broadcast = server_event_broadcast_cb,
 599         .push = server_event_push_cb,
 600         .add = server_event_add_cb,
 601         .remove = server_event_remove_cb
 602 };
 603
 604 /*****************************************************/
 605 /*****************************************************/
 606
 607 static void release_all_sessions_cb(void*closure, uint16_t id, void *ptr)
 608 {
 609         struct afb_session *session = ptr;
 610         afb_session_unref(session);
 611 }
 612
 613 static void release_all_tokens_cb(void*closure, uint16_t id, void *ptr)
 614 {
 615         struct afb_token *token = ptr;
 616         afb_token_unref(token);
 617 }
 618
 619 static void release_all_events_cb(void*closure, uint16_t id, void *ptr)
 620 {
 621         struct afb_event_x2 *eventid = ptr;
 622         afb_evt_event_x2_unref(eventid);
 623 }
 624
 625 /* disconnect */
 626 static void disconnect(struct afb_stub_ws *stubws)
 627 {
 628         struct u16id2ptr *i2p;
 629         struct u16id2bool *i2b;
 630
 631         afb_proto_ws_unref(__atomic_exchange_n(&stubws->proto, NULL, __ATOMIC_RELAXED));
 632         if (stubws->is_client) {
 633                 i2p = __atomic_exchange_n(&stubws->event_proxies, NULL, __ATOMIC_RELAXED);
 634                 if (i2p) {
 635                         u16id2ptr_forall(i2p, release_all_events_cb, NULL);
 636                         u16id2ptr_destroy(&i2p);
 637                 }
 638                 i2b = __atomic_exchange_n(&stubws->session_flags, NULL, __ATOMIC_RELAXED);
 639                 u16id2bool_destroy(&i2b);
 640                 i2b = __atomic_exchange_n(&stubws->token_flags, NULL, __ATOMIC_RELAXED);
 641                 u16id2bool_destroy(&i2b);
 642         } else {
 643                 afb_evt_listener_unref(__atomic_exchange_n(&stubws->listener, NULL, __ATOMIC_RELAXED));
 644                 afb_cred_unref(__atomic_exchange_n(&stubws->cred, NULL, __ATOMIC_RELAXED));
 645                 i2b = __atomic_exchange_n(&stubws->event_flags, NULL, __ATOMIC_RELAXED);
 646                 u16id2bool_destroy(&i2b);
 647                 i2p = __atomic_exchange_n(&stubws->session_proxies, NULL, __ATOMIC_RELAXED);
 648                 if (i2p) {
 649                         u16id2ptr_forall(i2p, release_all_sessions_cb, NULL);
 650                         u16id2ptr_destroy(&i2p);
 651                 }
 652                 i2p = __atomic_exchange_n(&stubws->token_proxies, NULL, __ATOMIC_RELAXED);
 653                 if (i2p) {
 654                         u16id2ptr_forall(i2p, release_all_tokens_cb, NULL);
 655                         u16id2ptr_destroy(&i2p);
 656                 }
 657         }
 658 }
 659
 660 /* callback when receiving a hangup */
 661 static void on_hangup(void *closure)
 662 {
 663         struct afb_stub_ws *stubws = closure;
 664
 665         if (stubws->proto) {
 666                 afb_stub_ws_addref(stubws);
 667                 disconnect(stubws);
 668                 if (stubws->on_hangup)
 669                         stubws->on_hangup(stubws);
 670                 afb_stub_ws_unref(stubws);
 671         }
 672 }
 673
 674 static int enqueue_processing(struct afb_proto_ws *proto, void (*callback)(int signum, void* arg), void *arg)
 675 {
 676         return jobs_queue(proto, 0, callback, arg);
 677 }
 678
 679 /*****************************************************/
 680
 681 static struct afb_proto_ws *afb_stub_ws_create_proto(struct afb_stub_ws *stubws, struct fdev *fdev, uint8_t is_client)
 682 {
 683         struct afb_proto_ws *proto;
 684
 685         stubws->proto = proto = is_client
 686                   ? afb_proto_ws_create_client(fdev, &client_itf, stubws)
 687                   : afb_proto_ws_create_server(fdev, &server_itf, stubws);
 688         if (proto) {
 689                 afb_proto_ws_on_hangup(proto, on_hangup);
 690                 afb_proto_ws_set_queuing(proto, enqueue_processing);
 691         }
 692
 693         return proto;
 694 }
 695
 696 static struct afb_stub_ws *afb_stub_ws_create(struct fdev *fdev, const char *apiname, struct afb_apiset *apiset, uint8_t is_client)
 697 {
 698         struct afb_stub_ws *stubws;
 699
 700         stubws = calloc(1, sizeof *stubws + 1 + strlen(apiname));
 701         if (stubws == NULL)
 702                 errno = ENOMEM;
 703         else {
 704                 if (afb_stub_ws_create_proto(stubws, fdev, is_client)) {
 705                         stubws->refcount = 1;
 706                         stubws->is_client = is_client;
 707                         strcpy(stubws->apiname, apiname);
 708                         stubws->apiset = afb_apiset_addref(apiset);
 709                         return stubws;
 710                 }
 711                 free(stubws);
 712         }
 713         fdev_unref(fdev);
 714         return NULL;
 715 }
 716
 717 struct afb_stub_ws *afb_stub_ws_create_client(struct fdev *fdev, const char *apiname, struct afb_apiset *apiset)
 718 {
 719         return afb_stub_ws_create(fdev, apiname, apiset, 1);
 720 }
 721
 722 struct afb_stub_ws *afb_stub_ws_create_server(struct fdev *fdev, const char *apiname, struct afb_apiset *apiset)
 723 {
 724         struct afb_stub_ws *stubws;
 725
 726         stubws = afb_stub_ws_create(fdev, apiname, apiset, 0);
 727         if (stubws) {
 728                 stubws->cred = afb_cred_create_for_socket(fdev_fd(fdev));
 729                 stubws->listener = afb_evt_listener_create(&server_event_itf, stubws);
 730                 if (stubws->listener != NULL)
 731                         return stubws;
 732                 afb_stub_ws_unref(stubws);
 733         }
 734         return NULL;
 735 }
 736
 737 void afb_stub_ws_unref(struct afb_stub_ws *stubws)
 738 {
 739         if (stubws && !__atomic_sub_fetch(&stubws->refcount, 1, __ATOMIC_RELAXED)) {
 740
 741                 if (stubws->is_client) {
 742                         stubws->robust.reopen = NULL;
 743                         if (stubws->robust.release)
 744                                 stubws->robust.release(stubws->robust.closure);
 745                 }
 746
 747                 disconnect(stubws);
 748                 afb_apiset_unref(stubws->apiset);
 749                 free(stubws);
 750         }
 751 }
 752
 753 void afb_stub_ws_addref(struct afb_stub_ws *stubws)
 754 {
 755         __atomic_add_fetch(&stubws->refcount, 1, __ATOMIC_RELAXED);
 756 }
 757
 758 void afb_stub_ws_set_on_hangup(struct afb_stub_ws *stubws, void (*on_hangup)(struct afb_stub_ws*))
 759 {
 760         stubws->on_hangup = on_hangup;
 761 }
 762
 763 const char *afb_stub_ws_name(struct afb_stub_ws *stubws)
 764 {
 765         return stubws->apiname;
 766 }
 767
 768 struct afb_api_item afb_stub_ws_client_api(struct afb_stub_ws *stubws)
 769 {
 770         struct afb_api_item api;
 771
 772         assert(stubws->is_client); /* check client */
 773         api.closure = stubws;
 774         api.itf = &client_api_itf;
 775         api.group = stubws; /* serialize for reconnections */
 776         return api;
 777 }
 778
 779 int afb_stub_ws_client_add(struct afb_stub_ws *stubws, struct afb_apiset *apiset)
 780 {
 781         return afb_apiset_add(apiset, stubws->apiname, afb_stub_ws_client_api(stubws));
 782 }
 783
 784 void afb_stub_ws_client_robustify(struct afb_stub_ws *stubws, struct fdev *(*reopen)(void*), void *closure, void (*release)(void*))
 785 {
 786         assert(stubws->is_client); /* check client */
 787
 788         if (stubws->robust.release)
 789                 stubws->robust.release(stubws->robust.closure);
 790
 791         stubws->robust.reopen = reopen;
 792         stubws->robust.closure = closure;
 793         stubws->robust.release = release;
 794 }