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                 afb_evt_event_x2_push(event, data);
 418         else
 419                 ERROR("unreadable push event");
 420 }
 421
 422 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)
 423 {
 424         afb_evt_rebroadcast(event_name, data, uuid, hop);
 425 }
 426
 427 /*****************************************************/
 428
 429 static struct afb_session *server_add_session(struct afb_stub_ws *stubws, uint16_t sessionid, const char *sessionstr)
 430 {
 431         struct afb_session *session;
 432         int rc, created;
 433
 434         session = afb_session_get(sessionstr, AFB_SESSION_TIMEOUT_DEFAULT, &created);
 435         if (session == NULL)
 436                 ERROR("can't create session %s, out of memory", sessionstr);
 437         else {
 438                 afb_session_set_autoclose(session, 1);
 439                 rc = u16id2ptr_add(&stubws->session_proxies, sessionid, session);
 440                 if (rc < 0) {
 441                         ERROR("can't record session %s", sessionstr);
 442                         afb_session_unref(session);
 443                         session = NULL;
 444                 }
 445         }
 446         return session;
 447 }
 448
 449 static void server_on_session_create_cb(void *closure, uint16_t sessionid, const char *sessionstr)
 450 {
 451         struct afb_stub_ws *stubws = closure;
 452
 453         server_add_session(stubws, sessionid, sessionstr);
 454 }
 455
 456 static void server_on_session_remove_cb(void *closure, uint16_t sessionid)
 457 {
 458         struct afb_stub_ws *stubws = closure;
 459         struct afb_session *session;
 460         int rc;
 461
 462         rc = u16id2ptr_drop(&stubws->event_proxies, sessionid, (void**)&session);
 463         if (rc == 0 && session)
 464                 afb_session_unref(session);
 465 }
 466
 467 static void server_on_token_create_cb(void *closure, uint16_t tokenid, const char *tokenstr)
 468 {
 469         struct afb_stub_ws *stubws = closure;
 470         struct afb_token *token;
 471         int rc;
 472
 473         rc = afb_token_get(&token, tokenstr);
 474         if (rc < 0)
 475                 ERROR("can't create token %s, out of memory", tokenstr);
 476         else {
 477                 rc = u16id2ptr_add(&stubws->token_proxies, tokenid, token);
 478                 if (rc < 0) {
 479                         ERROR("can't record token %s", tokenstr);
 480                         afb_token_unref(token);
 481                 }
 482         }
 483 }
 484
 485 static void server_on_token_remove_cb(void *closure, uint16_t tokenid)
 486 {
 487         struct afb_stub_ws *stubws = closure;
 488         struct afb_token *token;
 489         int rc;
 490
 491         rc = u16id2ptr_drop(&stubws->event_proxies, tokenid, (void**)&token);
 492         if (rc == 0 && token)
 493                 afb_token_unref(token);
 494 }
 495
 496 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)
 497 {
 498         struct afb_stub_ws *stubws = closure;
 499         struct server_req *wreq;
 500         struct afb_session *session;
 501         struct afb_token *token;
 502         int rc;
 503
 504         afb_stub_ws_addref(stubws);
 505
 506         /* get tokens and sessions */
 507         rc = u16id2ptr_get(stubws->session_proxies, sessionid, (void**)&session);
 508         if (rc < 0) {
 509                 if (sessionid != 0)
 510                         goto no_session;
 511                 session = server_add_session(stubws, sessionid, NULL);
 512                 if (!session)
 513                         goto out_of_memory;
 514         }
 515         if (!tokenid || u16id2ptr_get(stubws->token_proxies, tokenid, (void**)&token) < 0)
 516                 token = NULL;
 517
 518         /* create the request */
 519         wreq = malloc(sizeof *wreq);
 520         if (wreq == NULL)
 521                 goto out_of_memory;
 522
 523         afb_xreq_init(&wreq->xreq, &server_req_xreq_itf);
 524         wreq->stubws = stubws;
 525         wreq->call = call;
 526
 527         /* init the context */
 528         afb_context_init(&wreq->xreq.context, session, token, stubws->cred);
 529         afb_context_on_behalf_import(&wreq->xreq.context, user_creds);
 530
 531         /* makes the call */
 532         wreq->xreq.request.called_api = stubws->apiname;
 533         wreq->xreq.request.called_verb = verb;
 534         wreq->xreq.json = args;
 535         afb_xreq_process(&wreq->xreq, stubws->apiset);
 536         return;
 537
 538 out_of_memory:
 539 no_session:
 540         json_object_put(args);
 541         afb_stub_ws_unref(stubws);
 542         afb_proto_ws_call_reply(call, NULL, afb_error_text_internal_error, NULL);
 543         afb_proto_ws_call_unref(call);
 544 }
 545
 546 static void server_on_description_cb(void *closure, struct json_object *description)
 547 {
 548         struct afb_proto_ws_describe *describe = closure;
 549         afb_proto_ws_describe_put(describe, description);
 550         json_object_put(description);
 551 }
 552
 553
 554 static void server_on_describe_cb(void *closure, struct afb_proto_ws_describe *describe)
 555 {
 556         struct afb_stub_ws *stubws = closure;
 557
 558         afb_apiset_describe(stubws->apiset, stubws->apiname, server_on_description_cb, describe);
 559 }
 560
 561 /*****************************************************/
 562
 563 static const struct afb_proto_ws_client_itf client_itf =
 564 {
 565         .on_reply = client_on_reply_cb,
 566         .on_event_create = client_on_event_create_cb,
 567         .on_event_remove = client_on_event_remove_cb,
 568         .on_event_subscribe = client_on_event_subscribe_cb,
 569         .on_event_unsubscribe = client_on_event_unsubscribe_cb,
 570         .on_event_push = client_on_event_push_cb,
 571         .on_event_broadcast = client_on_event_broadcast_cb,
 572 };
 573
 574 static struct afb_api_itf client_api_itf = {
 575         .call = client_api_call_cb,
 576         .describe = client_api_describe_cb
 577 };
 578
 579 static const struct afb_proto_ws_server_itf server_itf =
 580 {
 581         .on_session_create = server_on_session_create_cb,
 582         .on_session_remove = server_on_session_remove_cb,
 583         .on_token_create = server_on_token_create_cb,
 584         .on_token_remove = server_on_token_remove_cb,
 585         .on_call = server_on_call_cb,
 586         .on_describe = server_on_describe_cb
 587 };
 588
 589 /* the interface for events pushing */
 590 static const struct afb_evt_itf server_event_itf = {
 591         .broadcast = server_event_broadcast_cb,
 592         .push = server_event_push_cb,
 593         .add = server_event_add_cb,
 594         .remove = server_event_remove_cb
 595 };
 596
 597 /*****************************************************/
 598 /*****************************************************/
 599
 600 static void release_all_sessions_cb(void*closure, uint16_t id, void *ptr)
 601 {
 602         struct afb_session *session = ptr;
 603         afb_session_unref(session);
 604 }
 605
 606 static void release_all_tokens_cb(void*closure, uint16_t id, void *ptr)
 607 {
 608         struct afb_token *token = ptr;
 609         afb_token_unref(token);
 610 }
 611
 612 static void release_all_events_cb(void*closure, uint16_t id, void *ptr)
 613 {
 614         struct afb_event_x2 *eventid = ptr;
 615         afb_evt_event_x2_unref(eventid);
 616 }
 617
 618 /* disconnect */
 619 static void disconnect(struct afb_stub_ws *stubws)
 620 {
 621         struct u16id2ptr *i2p;
 622         struct u16id2bool *i2b;
 623
 624         afb_proto_ws_unref(__atomic_exchange_n(&stubws->proto, NULL, __ATOMIC_RELAXED));
 625         if (stubws->is_client) {
 626                 i2p = __atomic_exchange_n(&stubws->event_proxies, NULL, __ATOMIC_RELAXED);
 627                 if (i2p) {
 628                         u16id2ptr_forall(i2p, release_all_events_cb, NULL);
 629                         u16id2ptr_destroy(&i2p);
 630                 }
 631                 i2b = __atomic_exchange_n(&stubws->session_flags, NULL, __ATOMIC_RELAXED);
 632                 u16id2bool_destroy(&i2b);
 633                 i2b = __atomic_exchange_n(&stubws->token_flags, NULL, __ATOMIC_RELAXED);
 634                 u16id2bool_destroy(&i2b);
 635         } else {
 636                 afb_evt_listener_unref(__atomic_exchange_n(&stubws->listener, NULL, __ATOMIC_RELAXED));
 637                 afb_cred_unref(__atomic_exchange_n(&stubws->cred, NULL, __ATOMIC_RELAXED));
 638                 i2b = __atomic_exchange_n(&stubws->event_flags, NULL, __ATOMIC_RELAXED);
 639                 u16id2bool_destroy(&i2b);
 640                 i2p = __atomic_exchange_n(&stubws->session_proxies, NULL, __ATOMIC_RELAXED);
 641                 if (i2p) {
 642                         u16id2ptr_forall(i2p, release_all_sessions_cb, NULL);
 643                         u16id2ptr_destroy(&i2p);
 644                 }
 645                 i2p = __atomic_exchange_n(&stubws->token_proxies, NULL, __ATOMIC_RELAXED);
 646                 if (i2p) {
 647                         u16id2ptr_forall(i2p, release_all_tokens_cb, NULL);
 648                         u16id2ptr_destroy(&i2p);
 649                 }
 650         }
 651 }
 652
 653 /* callback when receiving a hangup */
 654 static void on_hangup(void *closure)
 655 {
 656         struct afb_stub_ws *stubws = closure;
 657
 658         if (stubws->proto) {
 659                 afb_stub_ws_addref(stubws);
 660                 disconnect(stubws);
 661                 if (stubws->on_hangup)
 662                         stubws->on_hangup(stubws);
 663                 afb_stub_ws_unref(stubws);
 664         }
 665 }
 666
 667 static int enqueue_processing(struct afb_proto_ws *proto, void (*callback)(int signum, void* arg), void *arg)
 668 {
 669         return jobs_queue(proto, 0, callback, arg);
 670 }
 671
 672 /*****************************************************/
 673
 674 static struct afb_proto_ws *afb_stub_ws_create_proto(struct afb_stub_ws *stubws, struct fdev *fdev, uint8_t is_client)
 675 {
 676         struct afb_proto_ws *proto;
 677
 678         stubws->proto = proto = is_client
 679                   ? afb_proto_ws_create_client(fdev, &client_itf, stubws)
 680                   : afb_proto_ws_create_server(fdev, &server_itf, stubws);
 681         if (proto) {
 682                 afb_proto_ws_on_hangup(proto, on_hangup);
 683                 afb_proto_ws_set_queuing(proto, enqueue_processing);
 684         }
 685
 686         return proto;
 687 }
 688
 689 static struct afb_stub_ws *afb_stub_ws_create(struct fdev *fdev, const char *apiname, struct afb_apiset *apiset, uint8_t is_client)
 690 {
 691         struct afb_stub_ws *stubws;
 692
 693         stubws = calloc(1, sizeof *stubws + 1 + strlen(apiname));
 694         if (stubws == NULL)
 695                 errno = ENOMEM;
 696         else {
 697                 if (afb_stub_ws_create_proto(stubws, fdev, is_client)) {
 698                         stubws->refcount = 1;
 699                         stubws->is_client = is_client;
 700                         strcpy(stubws->apiname, apiname);
 701                         stubws->apiset = afb_apiset_addref(apiset);
 702                         return stubws;
 703                 }
 704                 free(stubws);
 705         }
 706         fdev_unref(fdev);
 707         return NULL;
 708 }
 709
 710 struct afb_stub_ws *afb_stub_ws_create_client(struct fdev *fdev, const char *apiname, struct afb_apiset *apiset)
 711 {
 712         return afb_stub_ws_create(fdev, apiname, apiset, 1);
 713 }
 714
 715 struct afb_stub_ws *afb_stub_ws_create_server(struct fdev *fdev, const char *apiname, struct afb_apiset *apiset)
 716 {
 717         struct afb_stub_ws *stubws;
 718
 719         stubws = afb_stub_ws_create(fdev, apiname, apiset, 0);
 720         if (stubws) {
 721                 stubws->cred = afb_cred_create_for_socket(fdev_fd(fdev));
 722                 stubws->listener = afb_evt_listener_create(&server_event_itf, stubws);
 723                 if (stubws->listener != NULL)
 724                         return stubws;
 725                 afb_stub_ws_unref(stubws);
 726         }
 727         return NULL;
 728 }
 729
 730 void afb_stub_ws_unref(struct afb_stub_ws *stubws)
 731 {
 732         if (stubws && !__atomic_sub_fetch(&stubws->refcount, 1, __ATOMIC_RELAXED)) {
 733
 734                 if (stubws->is_client) {
 735                         stubws->robust.reopen = NULL;
 736                         if (stubws->robust.release)
 737                                 stubws->robust.release(stubws->robust.closure);
 738                 }
 739
 740                 disconnect(stubws);
 741                 afb_apiset_unref(stubws->apiset);
 742                 free(stubws);
 743         }
 744 }
 745
 746 void afb_stub_ws_addref(struct afb_stub_ws *stubws)
 747 {
 748         __atomic_add_fetch(&stubws->refcount, 1, __ATOMIC_RELAXED);
 749 }
 750
 751 void afb_stub_ws_set_on_hangup(struct afb_stub_ws *stubws, void (*on_hangup)(struct afb_stub_ws*))
 752 {
 753         stubws->on_hangup = on_hangup;
 754 }
 755
 756 const char *afb_stub_ws_name(struct afb_stub_ws *stubws)
 757 {
 758         return stubws->apiname;
 759 }
 760
 761 struct afb_api_item afb_stub_ws_client_api(struct afb_stub_ws *stubws)
 762 {
 763         struct afb_api_item api;
 764
 765         assert(stubws->is_client); /* check client */
 766         api.closure = stubws;
 767         api.itf = &client_api_itf;
 768         api.group = stubws; /* serialize for reconnections */
 769         return api;
 770 }
 771
 772 int afb_stub_ws_client_add(struct afb_stub_ws *stubws, struct afb_apiset *apiset)
 773 {
 774         return afb_apiset_add(apiset, stubws->apiname, afb_stub_ws_client_api(stubws));
 775 }
 776
 777 void afb_stub_ws_client_robustify(struct afb_stub_ws *stubws, struct fdev *(*reopen)(void*), void *closure, void (*release)(void*))
 778 {
 779         assert(stubws->is_client); /* check client */
 780
 781         if (stubws->robust.release)
 782                 stubws->robust.release(stubws->robust.closure);
 783
 784         stubws->robust.reopen = reopen;
 785         stubws->robust.closure = closure;
 786         stubws->robust.release = release;
 787 }