src/afb-stub-ws.c

   1 /*
   2  * Copyright (C) 2015-2019 "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 <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_event_x2_add_watch(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, rc2;
 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         rc2 = afb_evt_event_x2_remove_watch(wreq->stubws->listener, event);
 185         if (rc >= 0 && rc2 < 0)
 186                 rc = rc2;
 187         if (rc < 0)
 188                 ERROR("error while unsubscribing event");
 189         return rc;
 190 }
 191
 192 static const struct afb_xreq_query_itf server_req_xreq_itf = {
 193         .reply = server_req_reply_cb,
 194         .unref = server_req_destroy_cb,
 195         .subscribe = server_req_subscribe_cb,
 196         .unsubscribe = server_req_unsubscribe_cb
 197 };
 198
 199 /******************* client part **********************************/
 200
 201 static struct afb_proto_ws *client_get_proto(struct afb_stub_ws *stubws)
 202 {
 203         struct fdev *fdev;
 204         struct afb_proto_ws *proto;
 205
 206         proto = stubws->proto;
 207         if (proto == NULL && stubws->robust.reopen) {
 208                 fdev = stubws->robust.reopen(stubws->robust.closure);
 209                 if (fdev != NULL)
 210                         proto = afb_stub_ws_create_proto(stubws, fdev, 0);
 211         }
 212         return proto;
 213 }
 214
 215 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)
 216 {
 217         int rc, rc2;
 218         uint16_t sid, tid;
 219
 220         rc = 0;
 221
 222         /* get the session */
 223         if (!context->session)
 224                 sid = 0;
 225         else {
 226                 sid = afb_session_id(context->session);
 227                 rc2 = u16id2bool_set(&stubws->session_flags, sid, 1);
 228                 if (rc2 < 0)
 229                         rc = rc2;
 230                 else if (rc2 == 0)
 231                         rc = afb_proto_ws_client_session_create(proto, sid, afb_session_uuid(context->session));
 232         }
 233
 234         /* get the token */
 235         if (!context->token)
 236                 tid = 0;
 237         else {
 238                 tid = afb_token_id(context->token);
 239                 rc2 = u16id2bool_set(&stubws->token_flags, tid, 1);
 240                 if (rc2 < 0)
 241                         rc = rc2;
 242                 else if (rc2 == 0) {
 243                         rc2 = afb_proto_ws_client_token_create(proto, tid, afb_token_string(context->token));
 244                         if (rc2 < 0)
 245                                 rc = rc2;
 246                 }
 247         }
 248
 249         *sessionid = sid;
 250         *tokenid = tid;
 251         return rc;
 252 }
 253
 254 /* on call, propagate it to the ws service */
 255 static void client_api_call_cb(void * closure, struct afb_xreq *xreq)
 256 {
 257         int rc;
 258         struct afb_stub_ws *stubws = closure;
 259         struct afb_proto_ws *proto;
 260         uint16_t sessionid;
 261         uint16_t tokenid;
 262
 263         proto = client_get_proto(stubws);
 264         if (proto == NULL) {
 265                 afb_xreq_reply(xreq, NULL, afb_error_text_disconnected, NULL);
 266                 return;
 267         }
 268
 269         rc = client_make_ids(stubws, proto, &xreq->context, &sessionid, &tokenid);
 270         if (rc >= 0) {
 271                 afb_xreq_unhooked_addref(xreq);
 272                 rc = afb_proto_ws_client_call(
 273                                 proto,
 274                                 xreq->request.called_verb,
 275                                 afb_xreq_json(xreq),
 276                                 sessionid,
 277                                 tokenid,
 278                                 xreq,
 279                                 xreq_on_behalf_cred_export(xreq));
 280         }
 281         if (rc < 0) {
 282                 afb_xreq_reply(xreq, NULL, afb_error_text_internal_error, "can't send message");
 283                 afb_xreq_unhooked_unref(xreq);
 284         }
 285 }
 286
 287 /* get the description */
 288 static void client_api_describe_cb(void * closure, void (*describecb)(void *, struct json_object *), void *clocb)
 289 {
 290         struct afb_stub_ws *stubws = closure;
 291         struct afb_proto_ws *proto;
 292
 293         proto = client_get_proto(stubws);
 294         if (proto)
 295                 afb_proto_ws_client_describe(proto, describecb, clocb);
 296         else
 297                 describecb(clocb, NULL);
 298 }
 299
 300 /******************* server part: manage events **********************************/
 301
 302 static void server_event_add_cb(void *closure, const char *event, uint16_t eventid)
 303 {
 304         int rc;
 305         struct afb_stub_ws *stubws = closure;
 306
 307         if (stubws->proto != NULL) {
 308                 rc = u16id2bool_set(&stubws->event_flags, eventid, 1);
 309                 if (rc == 0) {
 310                         rc = afb_proto_ws_server_event_create(stubws->proto, eventid, event);
 311                         if (rc < 0)
 312                                 u16id2bool_set(&stubws->event_flags, eventid, 0);
 313                 }
 314         }
 315 }
 316
 317 static void server_event_remove_cb(void *closure, const char *event, uint16_t eventid)
 318 {
 319         struct afb_stub_ws *stubws = closure;
 320
 321         if (stubws->proto != NULL) {
 322                 if (u16id2bool_set(&stubws->event_flags, eventid, 0))
 323                         afb_proto_ws_server_event_remove(stubws->proto, eventid);
 324         }
 325 }
 326
 327 static void server_event_push_cb(void *closure, const char *event, uint16_t eventid, struct json_object *object)
 328 {
 329         struct afb_stub_ws *stubws = closure;
 330
 331         if (stubws->proto != NULL && u16id2bool_get(stubws->event_flags, eventid))
 332                 afb_proto_ws_server_event_push(stubws->proto, eventid, object);
 333         json_object_put(object);
 334 }
 335
 336 static void server_event_broadcast_cb(void *closure, const char *event, struct json_object *object, const uuid_binary_t uuid, uint8_t hop)
 337 {
 338         struct afb_stub_ws *stubws = closure;
 339
 340         if (stubws->proto != NULL)
 341                 afb_proto_ws_server_event_broadcast(stubws->proto, event, object, uuid, hop);
 342         json_object_put(object);
 343 }
 344
 345 /*****************************************************/
 346
 347 static void client_on_reply_cb(void *closure, void *request, struct json_object *object, const char *error, const char *info)
 348 {
 349         struct afb_xreq *xreq = request;
 350
 351         afb_xreq_reply(xreq, object, error, info);
 352         afb_xreq_unhooked_unref(xreq);
 353 }
 354
 355 static void client_on_event_create_cb(void *closure, uint16_t event_id, const char *event_name)
 356 {
 357         struct afb_stub_ws *stubws = closure;
 358         struct afb_event_x2 *event;
 359         int rc;
 360
 361         /* check conflicts */
 362         event = afb_evt_event_x2_create(event_name);
 363         if (event == NULL)
 364                 ERROR("can't create event %s, out of memory", event_name);
 365         else {
 366                 rc = u16id2ptr_add(&stubws->event_proxies, event_id, event);
 367                 if (rc < 0) {
 368                         ERROR("can't record event %s", event_name);
 369                         afb_evt_event_x2_unref(event);
 370                 }
 371         }
 372 }
 373
 374 static void client_on_event_remove_cb(void *closure, uint16_t event_id)
 375 {
 376         struct afb_stub_ws *stubws = closure;
 377         struct afb_event_x2 *event;
 378         int rc;
 379
 380         rc = u16id2ptr_drop(&stubws->event_proxies, event_id, (void**)&event);
 381         if (rc == 0 && event)
 382                 afb_evt_event_x2_unref(event);
 383 }
 384
 385 static void client_on_event_subscribe_cb(void *closure, void *request, uint16_t event_id)
 386 {
 387         struct afb_stub_ws *stubws = closure;
 388         struct afb_xreq *xreq = request;
 389         struct afb_event_x2 *event;
 390         int rc;
 391
 392         rc = u16id2ptr_get(stubws->event_proxies, event_id, (void**)&event);
 393         if (rc < 0 || !event || afb_xreq_subscribe(xreq, event) < 0)
 394                 ERROR("can't subscribe: %m");
 395 }
 396
 397 static void client_on_event_unsubscribe_cb(void *closure, void *request, uint16_t event_id)
 398 {
 399         struct afb_stub_ws *stubws = closure;
 400         struct afb_xreq *xreq = request;
 401         struct afb_event_x2 *event;
 402         int rc;
 403
 404         rc = u16id2ptr_get(stubws->event_proxies, event_id, (void**)&event);
 405         if (rc < 0 || !event || afb_xreq_unsubscribe(xreq, event) < 0)
 406                 ERROR("can't unsubscribe: %m");
 407 }
 408
 409 static void client_on_event_push_cb(void *closure, uint16_t event_id, struct json_object *data)
 410 {
 411         struct afb_stub_ws *stubws = closure;
 412         struct afb_event_x2 *event;
 413         int rc;
 414
 415         rc = u16id2ptr_get(stubws->event_proxies, event_id, (void**)&event);
 416         if (rc >= 0 && event)
 417                 rc = afb_evt_event_x2_push(event, data);
 418         else
 419                 ERROR("unreadable push event");
 420         if (rc <= 0)
 421                 afb_proto_ws_client_event_unexpected(stubws->proto, event_id);
 422 }
 423
 424 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)
 425 {
 426         afb_evt_rebroadcast(event_name, data, uuid, hop);
 427 }
 428
 429 /*****************************************************/
 430
 431 static struct afb_session *server_add_session(struct afb_stub_ws *stubws, uint16_t sessionid, const char *sessionstr)
 432 {
 433         struct afb_session *session;
 434         int rc, created;
 435
 436         session = afb_session_get(sessionstr, AFB_SESSION_TIMEOUT_DEFAULT, &created);
 437         if (session == NULL)
 438                 ERROR("can't create session %s, out of memory", sessionstr);
 439         else {
 440                 afb_session_set_autoclose(session, 1);
 441                 rc = u16id2ptr_add(&stubws->session_proxies, sessionid, session);
 442                 if (rc < 0) {
 443                         ERROR("can't record session %s", sessionstr);
 444                         afb_session_unref(session);
 445                         session = NULL;
 446                 }
 447         }
 448         return session;
 449 }
 450
 451 static void server_on_session_create_cb(void *closure, uint16_t sessionid, const char *sessionstr)
 452 {
 453         struct afb_stub_ws *stubws = closure;
 454
 455         server_add_session(stubws, sessionid, sessionstr);
 456 }
 457
 458 static void server_on_session_remove_cb(void *closure, uint16_t sessionid)
 459 {
 460         struct afb_stub_ws *stubws = closure;
 461         struct afb_session *session;
 462         int rc;
 463
 464         rc = u16id2ptr_drop(&stubws->event_proxies, sessionid, (void**)&session);
 465         if (rc == 0 && session)
 466                 afb_session_unref(session);
 467 }
 468
 469 static void server_on_token_create_cb(void *closure, uint16_t tokenid, const char *tokenstr)
 470 {
 471         struct afb_stub_ws *stubws = closure;
 472         struct afb_token *token;
 473         int rc;
 474
 475         rc = afb_token_get(&token, tokenstr);
 476         if (rc < 0)
 477                 ERROR("can't create token %s, out of memory", tokenstr);
 478         else {
 479                 rc = u16id2ptr_add(&stubws->token_proxies, tokenid, token);
 480                 if (rc < 0) {
 481                         ERROR("can't record token %s", tokenstr);
 482                         afb_token_unref(token);
 483                 }
 484         }
 485 }
 486
 487 static void server_on_token_remove_cb(void *closure, uint16_t tokenid)
 488 {
 489         struct afb_stub_ws *stubws = closure;
 490         struct afb_token *token;
 491         int rc;
 492
 493         rc = u16id2ptr_drop(&stubws->event_proxies, tokenid, (void**)&token);
 494         if (rc == 0 && token)
 495                 afb_token_unref(token);
 496 }
 497
 498 static void server_on_event_unexpected_cb(void *closure, uint16_t eventid)
 499 {
 500         struct afb_stub_ws *stubws = closure;
 501
 502         afb_evt_watch_sub_eventid(stubws->listener, eventid);
 503 }
 504
 505 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)
 506 {
 507         struct afb_stub_ws *stubws = closure;
 508         struct server_req *wreq;
 509         struct afb_session *session;
 510         struct afb_token *token;
 511         int rc;
 512
 513         afb_stub_ws_addref(stubws);
 514
 515         /* get tokens and sessions */
 516         rc = u16id2ptr_get(stubws->session_proxies, sessionid, (void**)&session);
 517         if (rc < 0) {
 518                 if (sessionid != 0)
 519                         goto no_session;
 520                 session = server_add_session(stubws, sessionid, NULL);
 521                 if (!session)
 522                         goto out_of_memory;
 523         }
 524         if (!tokenid || u16id2ptr_get(stubws->token_proxies, tokenid, (void**)&token) < 0)
 525                 token = NULL;
 526
 527         /* create the request */
 528         wreq = malloc(sizeof *wreq);
 529         if (wreq == NULL)
 530                 goto out_of_memory;
 531
 532         afb_xreq_init(&wreq->xreq, &server_req_xreq_itf);
 533         wreq->stubws = stubws;
 534         wreq->call = call;
 535
 536         /* init the context */
 537         afb_context_init(&wreq->xreq.context, session, token, stubws->cred);
 538         afb_context_on_behalf_import(&wreq->xreq.context, user_creds);
 539
 540         /* makes the call */
 541         wreq->xreq.request.called_api = stubws->apiname;
 542         wreq->xreq.request.called_verb = verb;
 543         wreq->xreq.json = args;
 544         afb_xreq_process(&wreq->xreq, stubws->apiset);
 545         return;
 546
 547 out_of_memory:
 548 no_session:
 549         json_object_put(args);
 550         afb_stub_ws_unref(stubws);
 551         afb_proto_ws_call_reply(call, NULL, afb_error_text_internal_error, NULL);
 552         afb_proto_ws_call_unref(call);
 553 }
 554
 555 static void server_on_description_cb(void *closure, struct json_object *description)
 556 {
 557         struct afb_proto_ws_describe *describe = closure;
 558         afb_proto_ws_describe_put(describe, description);
 559         json_object_put(description);
 560 }
 561
 562
 563 static void server_on_describe_cb(void *closure, struct afb_proto_ws_describe *describe)
 564 {
 565         struct afb_stub_ws *stubws = closure;
 566
 567         afb_apiset_describe(stubws->apiset, stubws->apiname, server_on_description_cb, describe);
 568 }
 569
 570 /*****************************************************/
 571
 572 static const struct afb_proto_ws_client_itf client_itf =
 573 {
 574         .on_reply = client_on_reply_cb,
 575         .on_event_create = client_on_event_create_cb,
 576         .on_event_remove = client_on_event_remove_cb,
 577         .on_event_subscribe = client_on_event_subscribe_cb,
 578         .on_event_unsubscribe = client_on_event_unsubscribe_cb,
 579         .on_event_push = client_on_event_push_cb,
 580         .on_event_broadcast = client_on_event_broadcast_cb,
 581 };
 582
 583 static struct afb_api_itf client_api_itf = {
 584         .call = client_api_call_cb,
 585         .describe = client_api_describe_cb
 586 };
 587
 588 static const struct afb_proto_ws_server_itf server_itf =
 589 {
 590         .on_session_create = server_on_session_create_cb,
 591         .on_session_remove = server_on_session_remove_cb,
 592         .on_token_create = server_on_token_create_cb,
 593         .on_token_remove = server_on_token_remove_cb,
 594         .on_call = server_on_call_cb,
 595         .on_describe = server_on_describe_cb,
 596         .on_event_unexpected = server_on_event_unexpected_cb
 597 };
 598
 599 /* the interface for events pushing */
 600 static const struct afb_evt_itf server_event_itf = {
 601         .broadcast = server_event_broadcast_cb,
 602         .push = server_event_push_cb,
 603         .add = server_event_add_cb,
 604         .remove = server_event_remove_cb
 605 };
 606
 607 /*****************************************************/
 608 /*****************************************************/
 609
 610 static void release_all_sessions_cb(void*closure, uint16_t id, void *ptr)
 611 {
 612         struct afb_session *session = ptr;
 613         afb_session_unref(session);
 614 }
 615
 616 static void release_all_tokens_cb(void*closure, uint16_t id, void *ptr)
 617 {
 618         struct afb_token *token = ptr;
 619         afb_token_unref(token);
 620 }
 621
 622 static void release_all_events_cb(void*closure, uint16_t id, void *ptr)
 623 {
 624         struct afb_event_x2 *eventid = ptr;
 625         afb_evt_event_x2_unref(eventid);
 626 }
 627
 628 /* disconnect */
 629 static void disconnect(struct afb_stub_ws *stubws)
 630 {
 631         struct u16id2ptr *i2p;
 632         struct u16id2bool *i2b;
 633
 634         afb_proto_ws_unref(__atomic_exchange_n(&stubws->proto, NULL, __ATOMIC_RELAXED));
 635         if (stubws->is_client) {
 636                 i2p = __atomic_exchange_n(&stubws->event_proxies, NULL, __ATOMIC_RELAXED);
 637                 if (i2p) {
 638                         u16id2ptr_forall(i2p, release_all_events_cb, NULL);
 639                         u16id2ptr_destroy(&i2p);
 640                 }
 641                 i2b = __atomic_exchange_n(&stubws->session_flags, NULL, __ATOMIC_RELAXED);
 642                 u16id2bool_destroy(&i2b);
 643                 i2b = __atomic_exchange_n(&stubws->token_flags, NULL, __ATOMIC_RELAXED);
 644                 u16id2bool_destroy(&i2b);
 645         } else {
 646                 afb_evt_listener_unref(__atomic_exchange_n(&stubws->listener, NULL, __ATOMIC_RELAXED));
 647                 afb_cred_unref(__atomic_exchange_n(&stubws->cred, NULL, __ATOMIC_RELAXED));
 648                 i2b = __atomic_exchange_n(&stubws->event_flags, NULL, __ATOMIC_RELAXED);
 649                 u16id2bool_destroy(&i2b);
 650                 i2p = __atomic_exchange_n(&stubws->session_proxies, NULL, __ATOMIC_RELAXED);
 651                 if (i2p) {
 652                         u16id2ptr_forall(i2p, release_all_sessions_cb, NULL);
 653                         u16id2ptr_destroy(&i2p);
 654                 }
 655                 i2p = __atomic_exchange_n(&stubws->token_proxies, NULL, __ATOMIC_RELAXED);
 656                 if (i2p) {
 657                         u16id2ptr_forall(i2p, release_all_tokens_cb, NULL);
 658                         u16id2ptr_destroy(&i2p);
 659                 }
 660         }
 661 }
 662
 663 /* callback when receiving a hangup */
 664 static void on_hangup(void *closure)
 665 {
 666         struct afb_stub_ws *stubws = closure;
 667
 668         if (stubws->proto) {
 669                 afb_stub_ws_addref(stubws);
 670                 disconnect(stubws);
 671                 if (stubws->on_hangup)
 672                         stubws->on_hangup(stubws);
 673                 afb_stub_ws_unref(stubws);
 674         }
 675 }
 676
 677 static int enqueue_processing(struct afb_proto_ws *proto, void (*callback)(int signum, void* arg), void *arg)
 678 {
 679         return jobs_queue(proto, 0, callback, arg);
 680 }
 681
 682 /*****************************************************/
 683
 684 static struct afb_proto_ws *afb_stub_ws_create_proto(struct afb_stub_ws *stubws, struct fdev *fdev, uint8_t is_client)
 685 {
 686         struct afb_proto_ws *proto;
 687
 688         stubws->proto = proto = is_client
 689                   ? afb_proto_ws_create_client(fdev, &client_itf, stubws)
 690                   : afb_proto_ws_create_server(fdev, &server_itf, stubws);
 691         if (proto) {
 692                 afb_proto_ws_on_hangup(proto, on_hangup);
 693                 afb_proto_ws_set_queuing(proto, enqueue_processing);
 694         }
 695
 696         return proto;
 697 }
 698
 699 static struct afb_stub_ws *afb_stub_ws_create(struct fdev *fdev, const char *apiname, struct afb_apiset *apiset, uint8_t is_client)
 700 {
 701         struct afb_stub_ws *stubws;
 702
 703         stubws = calloc(1, sizeof *stubws + 1 + strlen(apiname));
 704         if (stubws == NULL)
 705                 errno = ENOMEM;
 706         else {
 707                 if (afb_stub_ws_create_proto(stubws, fdev, is_client)) {
 708                         stubws->refcount = 1;
 709                         stubws->is_client = is_client;
 710                         strcpy(stubws->apiname, apiname);
 711                         stubws->apiset = afb_apiset_addref(apiset);
 712                         return stubws;
 713                 }
 714                 free(stubws);
 715         }
 716         fdev_unref(fdev);
 717         return NULL;
 718 }
 719
 720 struct afb_stub_ws *afb_stub_ws_create_client(struct fdev *fdev, const char *apiname, struct afb_apiset *apiset)
 721 {
 722         return afb_stub_ws_create(fdev, apiname, apiset, 1);
 723 }
 724
 725 struct afb_stub_ws *afb_stub_ws_create_server(struct fdev *fdev, const char *apiname, struct afb_apiset *apiset)
 726 {
 727         struct afb_stub_ws *stubws;
 728
 729         stubws = afb_stub_ws_create(fdev, apiname, apiset, 0);
 730         if (stubws) {
 731                 stubws->cred = afb_cred_create_for_socket(fdev_fd(fdev));
 732                 stubws->listener = afb_evt_listener_create(&server_event_itf, stubws);
 733                 if (stubws->listener != NULL)
 734                         return stubws;
 735                 afb_stub_ws_unref(stubws);
 736         }
 737         return NULL;
 738 }
 739
 740 void afb_stub_ws_unref(struct afb_stub_ws *stubws)
 741 {
 742         if (stubws && !__atomic_sub_fetch(&stubws->refcount, 1, __ATOMIC_RELAXED)) {
 743
 744                 if (stubws->is_client) {
 745                         stubws->robust.reopen = NULL;
 746                         if (stubws->robust.release)
 747                                 stubws->robust.release(stubws->robust.closure);
 748                 }
 749
 750                 disconnect(stubws);
 751                 afb_apiset_unref(stubws->apiset);
 752                 free(stubws);
 753         }
 754 }
 755
 756 void afb_stub_ws_addref(struct afb_stub_ws *stubws)
 757 {
 758         __atomic_add_fetch(&stubws->refcount, 1, __ATOMIC_RELAXED);
 759 }
 760
 761 void afb_stub_ws_set_on_hangup(struct afb_stub_ws *stubws, void (*on_hangup)(struct afb_stub_ws*))
 762 {
 763         stubws->on_hangup = on_hangup;
 764 }
 765
 766 const char *afb_stub_ws_name(struct afb_stub_ws *stubws)
 767 {
 768         return stubws->apiname;
 769 }
 770
 771 struct afb_api_item afb_stub_ws_client_api(struct afb_stub_ws *stubws)
 772 {
 773         struct afb_api_item api;
 774
 775         assert(stubws->is_client); /* check client */
 776         api.closure = stubws;
 777         api.itf = &client_api_itf;
 778         api.group = stubws; /* serialize for reconnections */
 779         return api;
 780 }
 781
 782 int afb_stub_ws_client_add(struct afb_stub_ws *stubws, struct afb_apiset *apiset)
 783 {
 784         return afb_apiset_add(apiset, stubws->apiname, afb_stub_ws_client_api(stubws));
 785 }
 786
 787 void afb_stub_ws_client_robustify(struct afb_stub_ws *stubws, struct fdev *(*reopen)(void*), void *closure, void (*release)(void*))
 788 {
 789         assert(stubws->is_client); /* check client */
 790
 791         if (stubws->robust.release)
 792                 stubws->robust.release(stubws->robust.closure);
 793
 794         stubws->robust.reopen = reopen;
 795         stubws->robust.closure = closure;
 796         stubws->robust.release = release;
 797 }