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->session_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->token_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         const char *errstr = afb_error_text_internal_error;
 505         struct afb_stub_ws *stubws = closure;
 506         struct server_req *wreq;
 507         struct afb_session *session;
 508         struct afb_token *token;
 509         int rc;
 510
 511         afb_stub_ws_addref(stubws);
 512
 513         /* get tokens and sessions */
 514         rc = u16id2ptr_get(stubws->session_proxies, sessionid, (void**)&session);
 515         if (rc < 0) {
 516                 if (sessionid != 0)
 517                         goto no_session;
 518                 session = server_add_session(stubws, sessionid, NULL);
 519                 if (!session)
 520                         goto out_of_memory;
 521         }
 522         if (!tokenid || u16id2ptr_get(stubws->token_proxies, tokenid, (void**)&token) < 0)
 523                 token = NULL;
 524
 525         /* create the request */
 526         wreq = malloc(sizeof *wreq);
 527         if (wreq == NULL)
 528                 goto out_of_memory;
 529
 530         afb_xreq_init(&wreq->xreq, &server_req_xreq_itf);
 531         wreq->stubws = stubws;
 532         wreq->call = call;
 533
 534         /* init the context */
 535         afb_context_init(&wreq->xreq.context, session, token, stubws->cred);
 536         afb_context_on_behalf_import(&wreq->xreq.context, user_creds);
 537
 538         /* makes the call */
 539         wreq->xreq.request.called_api = stubws->apiname;
 540         wreq->xreq.request.called_verb = verb;
 541         wreq->xreq.json = args;
 542         afb_xreq_process(&wreq->xreq, stubws->apiset);
 543         return;
 544
 545 no_session:
 546         errstr = afb_error_text_unknown_session;
 547 out_of_memory:
 548         json_object_put(args);
 549         afb_stub_ws_unref(stubws);
 550         afb_proto_ws_call_reply(call, NULL, errstr, NULL);
 551         afb_proto_ws_call_unref(call);
 552 }
 553
 554 static void server_on_description_cb(void *closure, struct json_object *description)
 555 {
 556         struct afb_proto_ws_describe *describe = closure;
 557         afb_proto_ws_describe_put(describe, description);
 558         json_object_put(description);
 559 }
 560
 561
 562 static void server_on_describe_cb(void *closure, struct afb_proto_ws_describe *describe)
 563 {
 564         struct afb_stub_ws *stubws = closure;
 565
 566         afb_apiset_describe(stubws->apiset, stubws->apiname, server_on_description_cb, describe);
 567 }
 568
 569 /*****************************************************/
 570
 571 static const struct afb_proto_ws_client_itf client_itf =
 572 {
 573         .on_reply = client_on_reply_cb,
 574         .on_event_create = client_on_event_create_cb,
 575         .on_event_remove = client_on_event_remove_cb,
 576         .on_event_subscribe = client_on_event_subscribe_cb,
 577         .on_event_unsubscribe = client_on_event_unsubscribe_cb,
 578         .on_event_push = client_on_event_push_cb,
 579         .on_event_broadcast = client_on_event_broadcast_cb,
 580 };
 581
 582 static struct afb_api_itf client_api_itf = {
 583         .call = client_api_call_cb,
 584         .describe = client_api_describe_cb
 585 };
 586
 587 static const struct afb_proto_ws_server_itf server_itf =
 588 {
 589         .on_session_create = server_on_session_create_cb,
 590         .on_session_remove = server_on_session_remove_cb,
 591         .on_token_create = server_on_token_create_cb,
 592         .on_token_remove = server_on_token_remove_cb,
 593         .on_call = server_on_call_cb,
 594         .on_describe = server_on_describe_cb,
 595         .on_event_unexpected = server_on_event_unexpected_cb
 596 };
 597
 598 /* the interface for events pushing */
 599 static const struct afb_evt_itf server_event_itf = {
 600         .broadcast = server_event_broadcast_cb,
 601         .push = server_event_push_cb,
 602         .add = server_event_add_cb,
 603         .remove = server_event_remove_cb
 604 };
 605
 606 /*****************************************************/
 607 /*****************************************************/
 608
 609 static void release_all_sessions_cb(void*closure, uint16_t id, void *ptr)
 610 {
 611         struct afb_session *session = ptr;
 612         afb_session_unref(session);
 613 }
 614
 615 static void release_all_tokens_cb(void*closure, uint16_t id, void *ptr)
 616 {
 617         struct afb_token *token = ptr;
 618         afb_token_unref(token);
 619 }
 620
 621 static void release_all_events_cb(void*closure, uint16_t id, void *ptr)
 622 {
 623         struct afb_event_x2 *eventid = ptr;
 624         afb_evt_event_x2_unref(eventid);
 625 }
 626
 627 /* disconnect */
 628 static void disconnect(struct afb_stub_ws *stubws)
 629 {
 630         struct u16id2ptr *i2p;
 631         struct u16id2bool *i2b;
 632
 633         afb_proto_ws_unref(__atomic_exchange_n(&stubws->proto, NULL, __ATOMIC_RELAXED));
 634         if (stubws->is_client) {
 635                 i2p = __atomic_exchange_n(&stubws->event_proxies, NULL, __ATOMIC_RELAXED);
 636                 if (i2p) {
 637                         u16id2ptr_forall(i2p, release_all_events_cb, NULL);
 638                         u16id2ptr_destroy(&i2p);
 639                 }
 640                 i2b = __atomic_exchange_n(&stubws->session_flags, NULL, __ATOMIC_RELAXED);
 641                 u16id2bool_destroy(&i2b);
 642                 i2b = __atomic_exchange_n(&stubws->token_flags, NULL, __ATOMIC_RELAXED);
 643                 u16id2bool_destroy(&i2b);
 644         } else {
 645                 afb_evt_listener_unref(__atomic_exchange_n(&stubws->listener, NULL, __ATOMIC_RELAXED));
 646                 afb_cred_unref(__atomic_exchange_n(&stubws->cred, NULL, __ATOMIC_RELAXED));
 647                 i2b = __atomic_exchange_n(&stubws->event_flags, NULL, __ATOMIC_RELAXED);
 648                 u16id2bool_destroy(&i2b);
 649                 i2p = __atomic_exchange_n(&stubws->session_proxies, NULL, __ATOMIC_RELAXED);
 650                 if (i2p) {
 651                         u16id2ptr_forall(i2p, release_all_sessions_cb, NULL);
 652                         u16id2ptr_destroy(&i2p);
 653                 }
 654                 i2p = __atomic_exchange_n(&stubws->token_proxies, NULL, __ATOMIC_RELAXED);
 655                 if (i2p) {
 656                         u16id2ptr_forall(i2p, release_all_tokens_cb, NULL);
 657                         u16id2ptr_destroy(&i2p);
 658                 }
 659         }
 660 }
 661
 662 /* callback when receiving a hangup */
 663 static void on_hangup(void *closure)
 664 {
 665         struct afb_stub_ws *stubws = closure;
 666
 667         if (stubws->proto) {
 668                 afb_stub_ws_addref(stubws);
 669                 disconnect(stubws);
 670                 if (stubws->on_hangup)
 671                         stubws->on_hangup(stubws);
 672                 afb_stub_ws_unref(stubws);
 673         }
 674 }
 675
 676 static int enqueue_processing(struct afb_proto_ws *proto, void (*callback)(int signum, void* arg), void *arg)
 677 {
 678         return jobs_queue(proto, 0, callback, arg);
 679 }
 680
 681 /*****************************************************/
 682
 683 static struct afb_proto_ws *afb_stub_ws_create_proto(struct afb_stub_ws *stubws, struct fdev *fdev, uint8_t is_client)
 684 {
 685         struct afb_proto_ws *proto;
 686
 687         stubws->proto = proto = is_client
 688                   ? afb_proto_ws_create_client(fdev, &client_itf, stubws)
 689                   : afb_proto_ws_create_server(fdev, &server_itf, stubws);
 690         if (proto) {
 691                 afb_proto_ws_on_hangup(proto, on_hangup);
 692                 afb_proto_ws_set_queuing(proto, enqueue_processing);
 693         }
 694
 695         return proto;
 696 }
 697
 698 static struct afb_stub_ws *afb_stub_ws_create(struct fdev *fdev, const char *apiname, struct afb_apiset *apiset, uint8_t is_client)
 699 {
 700         struct afb_stub_ws *stubws;
 701
 702         stubws = calloc(1, sizeof *stubws + 1 + strlen(apiname));
 703         if (stubws == NULL)
 704                 errno = ENOMEM;
 705         else {
 706                 if (afb_stub_ws_create_proto(stubws, fdev, is_client)) {
 707                         stubws->refcount = 1;
 708                         stubws->is_client = is_client;
 709                         strcpy(stubws->apiname, apiname);
 710                         stubws->apiset = afb_apiset_addref(apiset);
 711                         return stubws;
 712                 }
 713                 free(stubws);
 714         }
 715         fdev_unref(fdev);
 716         return NULL;
 717 }
 718
 719 struct afb_stub_ws *afb_stub_ws_create_client(struct fdev *fdev, const char *apiname, struct afb_apiset *apiset)
 720 {
 721         return afb_stub_ws_create(fdev, apiname, apiset, 1);
 722 }
 723
 724 struct afb_stub_ws *afb_stub_ws_create_server(struct fdev *fdev, const char *apiname, struct afb_apiset *apiset)
 725 {
 726         struct afb_stub_ws *stubws;
 727
 728         stubws = afb_stub_ws_create(fdev, apiname, apiset, 0);
 729         if (stubws) {
 730                 stubws->cred = afb_cred_create_for_socket(fdev_fd(fdev));
 731                 stubws->listener = afb_evt_listener_create(&server_event_itf, stubws);
 732                 if (stubws->listener != NULL)
 733                         return stubws;
 734                 afb_stub_ws_unref(stubws);
 735         }
 736         return NULL;
 737 }
 738
 739 void afb_stub_ws_unref(struct afb_stub_ws *stubws)
 740 {
 741         if (stubws && !__atomic_sub_fetch(&stubws->refcount, 1, __ATOMIC_RELAXED)) {
 742
 743                 if (stubws->is_client) {
 744                         stubws->robust.reopen = NULL;
 745                         if (stubws->robust.release)
 746                                 stubws->robust.release(stubws->robust.closure);
 747                 }
 748
 749                 disconnect(stubws);
 750                 afb_apiset_unref(stubws->apiset);
 751                 free(stubws);
 752         }
 753 }
 754
 755 void afb_stub_ws_addref(struct afb_stub_ws *stubws)
 756 {
 757         __atomic_add_fetch(&stubws->refcount, 1, __ATOMIC_RELAXED);
 758 }
 759
 760 void afb_stub_ws_set_on_hangup(struct afb_stub_ws *stubws, void (*on_hangup)(struct afb_stub_ws*))
 761 {
 762         stubws->on_hangup = on_hangup;
 763 }
 764
 765 const char *afb_stub_ws_name(struct afb_stub_ws *stubws)
 766 {
 767         return stubws->apiname;
 768 }
 769
 770 struct afb_api_item afb_stub_ws_client_api(struct afb_stub_ws *stubws)
 771 {
 772         struct afb_api_item api;
 773
 774         assert(stubws->is_client); /* check client */
 775         api.closure = stubws;
 776         api.itf = &client_api_itf;
 777         api.group = stubws; /* serialize for reconnections */
 778         return api;
 779 }
 780
 781 int afb_stub_ws_client_add(struct afb_stub_ws *stubws, struct afb_apiset *apiset)
 782 {
 783         return afb_apiset_add(apiset, stubws->apiname, afb_stub_ws_client_api(stubws));
 784 }
 785
 786 void afb_stub_ws_client_robustify(struct afb_stub_ws *stubws, struct fdev *(*reopen)(void*), void *closure, void (*release)(void*))
 787 {
 788         assert(stubws->is_client); /* check client */
 789
 790         if (stubws->robust.release)
 791                 stubws->robust.release(stubws->robust.closure);
 792
 793         stubws->robust.reopen = reopen;
 794         stubws->robust.closure = closure;
 795         stubws->robust.release = release;
 796 }