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         afb_cred_unref(wreq->xreq.cred);
 149         json_object_put(wreq->xreq.json);
 150         afb_proto_ws_call_unref(wreq->call);
 151         afb_stub_ws_unref(wreq->stubws);
 152         free(wreq);
 153 }
 154
 155 static void server_req_reply_cb(struct afb_xreq *xreq, struct json_object *obj, const char *error, const char *info)
 156 {
 157         int rc;
 158         struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq);
 159
 160         rc = afb_proto_ws_call_reply(wreq->call, obj, error, info);
 161         if (rc < 0)
 162                 ERROR("error while sending reply");
 163         json_object_put(obj);
 164 }
 165
 166 static int server_req_subscribe_cb(struct afb_xreq *xreq, struct afb_event_x2 *event)
 167 {
 168         int rc;
 169         struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq);
 170
 171         rc = afb_evt_event_x2_add_watch(wreq->stubws->listener, event);
 172         if (rc >= 0)
 173                 rc = afb_proto_ws_call_subscribe(wreq->call,  afb_evt_event_x2_id(event));
 174         if (rc < 0)
 175                 ERROR("error while subscribing event");
 176         return rc;
 177 }
 178
 179 static int server_req_unsubscribe_cb(struct afb_xreq *xreq, struct afb_event_x2 *event)
 180 {
 181         int rc, rc2;
 182         struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq);
 183
 184         rc = afb_proto_ws_call_unsubscribe(wreq->call,  afb_evt_event_x2_id(event));
 185         rc2 = afb_evt_event_x2_remove_watch(wreq->stubws->listener, event);
 186         if (rc >= 0 && rc2 < 0)
 187                 rc = rc2;
 188         if (rc < 0)
 189                 ERROR("error while unsubscribing event");
 190         return rc;
 191 }
 192
 193 static const struct afb_xreq_query_itf server_req_xreq_itf = {
 194         .reply = server_req_reply_cb,
 195         .unref = server_req_destroy_cb,
 196         .subscribe = server_req_subscribe_cb,
 197         .unsubscribe = server_req_unsubscribe_cb
 198 };
 199
 200 /******************* client part **********************************/
 201
 202 static struct afb_proto_ws *client_get_proto(struct afb_stub_ws *stubws)
 203 {
 204         struct fdev *fdev;
 205         struct afb_proto_ws *proto;
 206
 207         proto = stubws->proto;
 208         if (proto == NULL && stubws->robust.reopen) {
 209                 fdev = stubws->robust.reopen(stubws->robust.closure);
 210                 if (fdev != NULL)
 211                         proto = afb_stub_ws_create_proto(stubws, fdev, 0);
 212         }
 213         return proto;
 214 }
 215
 216 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)
 217 {
 218         int rc, rc2;
 219         uint16_t sid, tid;
 220
 221         rc = 0;
 222
 223         /* get the session */
 224         if (!context->session)
 225                 sid = 0;
 226         else {
 227                 sid = afb_session_id(context->session);
 228                 rc2 = u16id2bool_set(&stubws->session_flags, sid, 1);
 229                 if (rc2 < 0)
 230                         rc = rc2;
 231                 else if (rc2 == 0)
 232                         rc = afb_proto_ws_client_session_create(proto, sid, afb_session_uuid(context->session));
 233         }
 234
 235         /* get the token */
 236         if (!context->token)
 237                 tid = 0;
 238         else {
 239                 tid = afb_token_id(context->token);
 240                 rc2 = u16id2bool_set(&stubws->token_flags, tid, 1);
 241                 if (rc2 < 0)
 242                         rc = rc2;
 243                 else if (rc2 == 0) {
 244                         rc2 = afb_proto_ws_client_token_create(proto, tid, afb_token_string(context->token));
 245                         if (rc2 < 0)
 246                                 rc = rc2;
 247                 }
 248         }
 249
 250         *sessionid = sid;
 251         *tokenid = tid;
 252         return rc;
 253 }
 254
 255 /* on call, propagate it to the ws service */
 256 static void client_api_call_cb(void * closure, struct afb_xreq *xreq)
 257 {
 258         int rc;
 259         struct afb_stub_ws *stubws = closure;
 260         struct afb_proto_ws *proto;
 261         uint16_t sessionid;
 262         uint16_t tokenid;
 263
 264         proto = client_get_proto(stubws);
 265         if (proto == NULL) {
 266                 afb_xreq_reply(xreq, NULL, afb_error_text_disconnected, NULL);
 267                 return;
 268         }
 269
 270         rc = client_make_ids(stubws, proto, &xreq->context, &sessionid, &tokenid);
 271         if (rc >= 0) {
 272                 afb_xreq_unhooked_addref(xreq);
 273                 rc = afb_proto_ws_client_call(
 274                                 proto,
 275                                 xreq->request.called_verb,
 276                                 afb_xreq_json(xreq),
 277                                 sessionid,
 278                                 tokenid,
 279                                 xreq,
 280                                 xreq_on_behalf_cred_export(xreq));
 281         }
 282         if (rc < 0) {
 283                 afb_xreq_reply(xreq, NULL, afb_error_text_internal_error, "can't send message");
 284                 afb_xreq_unhooked_unref(xreq);
 285         }
 286 }
 287
 288 /* get the description */
 289 static void client_api_describe_cb(void * closure, void (*describecb)(void *, struct json_object *), void *clocb)
 290 {
 291         struct afb_stub_ws *stubws = closure;
 292         struct afb_proto_ws *proto;
 293
 294         proto = client_get_proto(stubws);
 295         if (proto)
 296                 afb_proto_ws_client_describe(proto, describecb, clocb);
 297         else
 298                 describecb(clocb, NULL);
 299 }
 300
 301 /******************* server part: manage events **********************************/
 302
 303 static void server_event_add_cb(void *closure, const char *event, uint16_t eventid)
 304 {
 305         int rc;
 306         struct afb_stub_ws *stubws = closure;
 307
 308         if (stubws->proto != NULL) {
 309                 rc = u16id2bool_set(&stubws->event_flags, eventid, 1);
 310                 if (rc == 0) {
 311                         rc = afb_proto_ws_server_event_create(stubws->proto, eventid, event);
 312                         if (rc < 0)
 313                                 u16id2bool_set(&stubws->event_flags, eventid, 0);
 314                 }
 315         }
 316 }
 317
 318 static void server_event_remove_cb(void *closure, const char *event, uint16_t eventid)
 319 {
 320         struct afb_stub_ws *stubws = closure;
 321
 322         if (stubws->proto != NULL) {
 323                 if (u16id2bool_set(&stubws->event_flags, eventid, 0))
 324                         afb_proto_ws_server_event_remove(stubws->proto, eventid);
 325         }
 326 }
 327
 328 static void server_event_push_cb(void *closure, const char *event, uint16_t eventid, struct json_object *object)
 329 {
 330         struct afb_stub_ws *stubws = closure;
 331
 332         if (stubws->proto != NULL && u16id2bool_get(stubws->event_flags, eventid))
 333                 afb_proto_ws_server_event_push(stubws->proto, eventid, object);
 334         json_object_put(object);
 335 }
 336
 337 static void server_event_broadcast_cb(void *closure, const char *event, struct json_object *object, const uuid_binary_t uuid, uint8_t hop)
 338 {
 339         struct afb_stub_ws *stubws = closure;
 340
 341         if (stubws->proto != NULL)
 342                 afb_proto_ws_server_event_broadcast(stubws->proto, event, object, uuid, hop);
 343         json_object_put(object);
 344 }
 345
 346 /*****************************************************/
 347
 348 static void client_on_reply_cb(void *closure, void *request, struct json_object *object, const char *error, const char *info)
 349 {
 350         struct afb_xreq *xreq = request;
 351
 352         afb_xreq_reply(xreq, object, error, info);
 353         afb_xreq_unhooked_unref(xreq);
 354 }
 355
 356 static void client_on_event_create_cb(void *closure, uint16_t event_id, const char *event_name)
 357 {
 358         struct afb_stub_ws *stubws = closure;
 359         struct afb_event_x2 *event;
 360         int rc;
 361
 362         /* check conflicts */
 363         event = afb_evt_event_x2_create(event_name);
 364         if (event == NULL)
 365                 ERROR("can't create event %s, out of memory", event_name);
 366         else {
 367                 rc = u16id2ptr_add(&stubws->event_proxies, event_id, event);
 368                 if (rc < 0) {
 369                         ERROR("can't record event %s", event_name);
 370                         afb_evt_event_x2_unref(event);
 371                 }
 372         }
 373 }
 374
 375 static void client_on_event_remove_cb(void *closure, uint16_t event_id)
 376 {
 377         struct afb_stub_ws *stubws = closure;
 378         struct afb_event_x2 *event;
 379         int rc;
 380
 381         rc = u16id2ptr_drop(&stubws->event_proxies, event_id, (void**)&event);
 382         if (rc == 0 && event)
 383                 afb_evt_event_x2_unref(event);
 384 }
 385
 386 static void client_on_event_subscribe_cb(void *closure, void *request, uint16_t event_id)
 387 {
 388         struct afb_stub_ws *stubws = closure;
 389         struct afb_xreq *xreq = request;
 390         struct afb_event_x2 *event;
 391         int rc;
 392
 393         rc = u16id2ptr_get(stubws->event_proxies, event_id, (void**)&event);
 394         if (rc < 0 || !event || afb_xreq_subscribe(xreq, event) < 0)
 395                 ERROR("can't subscribe: %m");
 396 }
 397
 398 static void client_on_event_unsubscribe_cb(void *closure, void *request, uint16_t event_id)
 399 {
 400         struct afb_stub_ws *stubws = closure;
 401         struct afb_xreq *xreq = request;
 402         struct afb_event_x2 *event;
 403         int rc;
 404
 405         rc = u16id2ptr_get(stubws->event_proxies, event_id, (void**)&event);
 406         if (rc < 0 || !event || afb_xreq_unsubscribe(xreq, event) < 0)
 407                 ERROR("can't unsubscribe: %m");
 408 }
 409
 410 static void client_on_event_push_cb(void *closure, uint16_t event_id, struct json_object *data)
 411 {
 412         struct afb_stub_ws *stubws = closure;
 413         struct afb_event_x2 *event;
 414         int rc;
 415
 416         rc = u16id2ptr_get(stubws->event_proxies, event_id, (void**)&event);
 417         if (rc >= 0 && event)
 418                 afb_evt_event_x2_push(event, data);
 419         else
 420                 ERROR("unreadable push event");
 421 }
 422
 423 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)
 424 {
 425         afb_evt_rebroadcast(event_name, data, uuid, hop);
 426 }
 427
 428 /*****************************************************/
 429
 430 static struct afb_session *server_add_session(struct afb_stub_ws *stubws, uint16_t sessionid, const char *sessionstr)
 431 {
 432         struct afb_session *session;
 433         int rc, created;
 434
 435         session = afb_session_get(sessionstr, AFB_SESSION_TIMEOUT_DEFAULT, &created);
 436         if (session == NULL)
 437                 ERROR("can't create session %s, out of memory", sessionstr);
 438         else {
 439                 afb_session_set_autoclose(session, 1);
 440                 rc = u16id2ptr_add(&stubws->session_proxies, sessionid, session);
 441                 if (rc < 0) {
 442                         ERROR("can't record session %s", sessionstr);
 443                         afb_session_unref(session);
 444                         session = NULL;
 445                 }
 446         }
 447         return session;
 448 }
 449
 450 static void server_on_session_create_cb(void *closure, uint16_t sessionid, const char *sessionstr)
 451 {
 452         struct afb_stub_ws *stubws = closure;
 453
 454         server_add_session(stubws, sessionid, sessionstr);
 455 }
 456
 457 static void server_on_session_remove_cb(void *closure, uint16_t sessionid)
 458 {
 459         struct afb_stub_ws *stubws = closure;
 460         struct afb_session *session;
 461         int rc;
 462
 463         rc = u16id2ptr_drop(&stubws->event_proxies, sessionid, (void**)&session);
 464         if (rc == 0 && session)
 465                 afb_session_unref(session);
 466 }
 467
 468 static void server_on_token_create_cb(void *closure, uint16_t tokenid, const char *tokenstr)
 469 {
 470         struct afb_stub_ws *stubws = closure;
 471         struct afb_token *token;
 472         int rc;
 473
 474         rc = afb_token_get(&token, tokenstr);
 475         if (rc < 0)
 476                 ERROR("can't create token %s, out of memory", tokenstr);
 477         else {
 478                 rc = u16id2ptr_add(&stubws->token_proxies, tokenid, token);
 479                 if (rc < 0) {
 480                         ERROR("can't record token %s", tokenstr);
 481                         afb_token_unref(token);
 482                 }
 483         }
 484 }
 485
 486 static void server_on_token_remove_cb(void *closure, uint16_t tokenid)
 487 {
 488         struct afb_stub_ws *stubws = closure;
 489         struct afb_token *token;
 490         int rc;
 491
 492         rc = u16id2ptr_drop(&stubws->event_proxies, tokenid, (void**)&token);
 493         if (rc == 0 && token)
 494                 afb_token_unref(token);
 495 }
 496
 497 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)
 498 {
 499         struct afb_stub_ws *stubws = closure;
 500         struct server_req *wreq;
 501         struct afb_session *session;
 502         struct afb_token *token;
 503         int rc;
 504
 505         afb_stub_ws_addref(stubws);
 506
 507         /* get tokens and sessions */
 508         rc = u16id2ptr_get(stubws->session_proxies, sessionid, (void**)&session);
 509         if (rc < 0) {
 510                 if (sessionid != 0)
 511                         goto no_session;
 512                 session = server_add_session(stubws, sessionid, NULL);
 513                 if (!session)
 514                         goto out_of_memory;
 515         }
 516         if (!tokenid || u16id2ptr_get(stubws->token_proxies, tokenid, (void**)&token) < 0)
 517                 token = NULL;
 518
 519         /* create the request */
 520         wreq = malloc(sizeof *wreq);
 521         if (wreq == NULL)
 522                 goto out_of_memory;
 523
 524         afb_xreq_init(&wreq->xreq, &server_req_xreq_itf);
 525         wreq->stubws = stubws;
 526         wreq->call = call;
 527
 528         /* init the context */
 529         afb_context_init(&wreq->xreq.context, session, token);
 530
 531         /* makes the call */
 532         wreq->xreq.cred = afb_cred_mixed_on_behalf_import(stubws->cred, &wreq->xreq.context, user_creds);
 533         wreq->xreq.request.called_api = stubws->apiname;
 534         wreq->xreq.request.called_verb = verb;
 535         wreq->xreq.json = args;
 536         afb_xreq_process(&wreq->xreq, stubws->apiset);
 537         return;
 538
 539 out_of_memory:
 540 no_session:
 541         json_object_put(args);
 542         afb_stub_ws_unref(stubws);
 543         afb_proto_ws_call_reply(call, NULL, afb_error_text_internal_error, NULL);
 544         afb_proto_ws_call_unref(call);
 545 }
 546
 547 static void server_on_description_cb(void *closure, struct json_object *description)
 548 {
 549         struct afb_proto_ws_describe *describe = closure;
 550         afb_proto_ws_describe_put(describe, description);
 551         json_object_put(description);
 552 }
 553
 554
 555 static void server_on_describe_cb(void *closure, struct afb_proto_ws_describe *describe)
 556 {
 557         struct afb_stub_ws *stubws = closure;
 558
 559         afb_apiset_describe(stubws->apiset, stubws->apiname, server_on_description_cb, describe);
 560 }
 561
 562 /*****************************************************/
 563
 564 static const struct afb_proto_ws_client_itf client_itf =
 565 {
 566         .on_reply = client_on_reply_cb,
 567         .on_event_create = client_on_event_create_cb,
 568         .on_event_remove = client_on_event_remove_cb,
 569         .on_event_subscribe = client_on_event_subscribe_cb,
 570         .on_event_unsubscribe = client_on_event_unsubscribe_cb,
 571         .on_event_push = client_on_event_push_cb,
 572         .on_event_broadcast = client_on_event_broadcast_cb,
 573 };
 574
 575 static struct afb_api_itf client_api_itf = {
 576         .call = client_api_call_cb,
 577         .describe = client_api_describe_cb
 578 };
 579
 580 static const struct afb_proto_ws_server_itf server_itf =
 581 {
 582         .on_session_create = server_on_session_create_cb,
 583         .on_session_remove = server_on_session_remove_cb,
 584         .on_token_create = server_on_token_create_cb,
 585         .on_token_remove = server_on_token_remove_cb,
 586         .on_call = server_on_call_cb,
 587         .on_describe = server_on_describe_cb
 588 };
 589
 590 /* the interface for events pushing */
 591 static const struct afb_evt_itf server_event_itf = {
 592         .broadcast = server_event_broadcast_cb,
 593         .push = server_event_push_cb,
 594         .add = server_event_add_cb,
 595         .remove = server_event_remove_cb
 596 };
 597
 598 /*****************************************************/
 599 /*****************************************************/
 600
 601 static void release_all_sessions_cb(void*closure, uint16_t id, void *ptr)
 602 {
 603         struct afb_session *session = ptr;
 604         afb_session_unref(session);
 605 }
 606
 607 static void release_all_tokens_cb(void*closure, uint16_t id, void *ptr)
 608 {
 609         struct afb_token *token = ptr;
 610         afb_token_unref(token);
 611 }
 612
 613 static void release_all_events_cb(void*closure, uint16_t id, void *ptr)
 614 {
 615         struct afb_event_x2 *eventid = ptr;
 616         afb_evt_event_x2_unref(eventid);
 617 }
 618
 619 /* disconnect */
 620 static void disconnect(struct afb_stub_ws *stubws)
 621 {
 622         struct u16id2ptr *i2p;
 623         struct u16id2bool *i2b;
 624
 625         afb_proto_ws_unref(__atomic_exchange_n(&stubws->proto, NULL, __ATOMIC_RELAXED));
 626         if (stubws->is_client) {
 627                 i2p = __atomic_exchange_n(&stubws->event_proxies, NULL, __ATOMIC_RELAXED);
 628                 if (i2p) {
 629                         u16id2ptr_forall(i2p, release_all_events_cb, NULL);
 630                         u16id2ptr_destroy(&i2p);
 631                 }
 632                 i2b = __atomic_exchange_n(&stubws->session_flags, NULL, __ATOMIC_RELAXED);
 633                 u16id2bool_destroy(&i2b);
 634                 i2b = __atomic_exchange_n(&stubws->token_flags, NULL, __ATOMIC_RELAXED);
 635                 u16id2bool_destroy(&i2b);
 636         } else {
 637                 afb_evt_listener_unref(__atomic_exchange_n(&stubws->listener, NULL, __ATOMIC_RELAXED));
 638                 afb_cred_unref(__atomic_exchange_n(&stubws->cred, NULL, __ATOMIC_RELAXED));
 639                 i2b = __atomic_exchange_n(&stubws->event_flags, NULL, __ATOMIC_RELAXED);
 640                 u16id2bool_destroy(&i2b);
 641                 i2p = __atomic_exchange_n(&stubws->session_proxies, NULL, __ATOMIC_RELAXED);
 642                 if (i2p) {
 643                         u16id2ptr_forall(i2p, release_all_sessions_cb, NULL);
 644                         u16id2ptr_destroy(&i2p);
 645                 }
 646                 i2p = __atomic_exchange_n(&stubws->token_proxies, NULL, __ATOMIC_RELAXED);
 647                 if (i2p) {
 648                         u16id2ptr_forall(i2p, release_all_tokens_cb, NULL);
 649                         u16id2ptr_destroy(&i2p);
 650                 }
 651         }
 652 }
 653
 654 /* callback when receiving a hangup */
 655 static void on_hangup(void *closure)
 656 {
 657         struct afb_stub_ws *stubws = closure;
 658
 659         if (stubws->proto) {
 660                 afb_stub_ws_addref(stubws);
 661                 disconnect(stubws);
 662                 if (stubws->on_hangup)
 663                         stubws->on_hangup(stubws);
 664                 afb_stub_ws_unref(stubws);
 665         }
 666 }
 667
 668 static int enqueue_processing(struct afb_proto_ws *proto, void (*callback)(int signum, void* arg), void *arg)
 669 {
 670         return jobs_queue(proto, 0, callback, arg);
 671 }
 672
 673 /*****************************************************/
 674
 675 static struct afb_proto_ws *afb_stub_ws_create_proto(struct afb_stub_ws *stubws, struct fdev *fdev, uint8_t is_client)
 676 {
 677         struct afb_proto_ws *proto;
 678
 679         stubws->proto = proto = is_client
 680                   ? afb_proto_ws_create_client(fdev, &client_itf, stubws)
 681                   : afb_proto_ws_create_server(fdev, &server_itf, stubws);
 682         if (proto) {
 683                 afb_proto_ws_on_hangup(proto, on_hangup);
 684                 afb_proto_ws_set_queuing(proto, enqueue_processing);
 685         }
 686
 687         return proto;
 688 }
 689
 690 static struct afb_stub_ws *afb_stub_ws_create(struct fdev *fdev, const char *apiname, struct afb_apiset *apiset, uint8_t is_client)
 691 {
 692         struct afb_stub_ws *stubws;
 693
 694         stubws = calloc(1, sizeof *stubws + 1 + strlen(apiname));
 695         if (stubws == NULL)
 696                 errno = ENOMEM;
 697         else {
 698                 if (afb_stub_ws_create_proto(stubws, fdev, is_client)) {
 699                         stubws->refcount = 1;
 700                         stubws->is_client = is_client;
 701                         strcpy(stubws->apiname, apiname);
 702                         stubws->apiset = afb_apiset_addref(apiset);
 703                         return stubws;
 704                 }
 705                 free(stubws);
 706         }
 707         fdev_unref(fdev);
 708         return NULL;
 709 }
 710
 711 struct afb_stub_ws *afb_stub_ws_create_client(struct fdev *fdev, const char *apiname, struct afb_apiset *apiset)
 712 {
 713         return afb_stub_ws_create(fdev, apiname, apiset, 1);
 714 }
 715
 716 struct afb_stub_ws *afb_stub_ws_create_server(struct fdev *fdev, const char *apiname, struct afb_apiset *apiset)
 717 {
 718         struct afb_stub_ws *stubws;
 719
 720         stubws = afb_stub_ws_create(fdev, apiname, apiset, 0);
 721         if (stubws) {
 722                 stubws->cred = afb_cred_create_for_socket(fdev_fd(fdev));
 723                 stubws->listener = afb_evt_listener_create(&server_event_itf, stubws);
 724                 if (stubws->listener != NULL)
 725                         return stubws;
 726                 afb_stub_ws_unref(stubws);
 727         }
 728         return NULL;
 729 }
 730
 731 void afb_stub_ws_unref(struct afb_stub_ws *stubws)
 732 {
 733         if (stubws && !__atomic_sub_fetch(&stubws->refcount, 1, __ATOMIC_RELAXED)) {
 734
 735                 if (stubws->is_client) {
 736                         stubws->robust.reopen = NULL;
 737                         if (stubws->robust.release)
 738                                 stubws->robust.release(stubws->robust.closure);
 739                 }
 740
 741                 disconnect(stubws);
 742                 afb_apiset_unref(stubws->apiset);
 743                 free(stubws);
 744         }
 745 }
 746
 747 void afb_stub_ws_addref(struct afb_stub_ws *stubws)
 748 {
 749         __atomic_add_fetch(&stubws->refcount, 1, __ATOMIC_RELAXED);
 750 }
 751
 752 void afb_stub_ws_set_on_hangup(struct afb_stub_ws *stubws, void (*on_hangup)(struct afb_stub_ws*))
 753 {
 754         stubws->on_hangup = on_hangup;
 755 }
 756
 757 const char *afb_stub_ws_name(struct afb_stub_ws *stubws)
 758 {
 759         return stubws->apiname;
 760 }
 761
 762 struct afb_api_item afb_stub_ws_client_api(struct afb_stub_ws *stubws)
 763 {
 764         struct afb_api_item api;
 765
 766         assert(stubws->is_client); /* check client */
 767         api.closure = stubws;
 768         api.itf = &client_api_itf;
 769         api.group = stubws; /* serialize for reconnections */
 770         return api;
 771 }
 772
 773 int afb_stub_ws_client_add(struct afb_stub_ws *stubws, struct afb_apiset *apiset)
 774 {
 775         return afb_apiset_add(apiset, stubws->apiname, afb_stub_ws_client_api(stubws));
 776 }
 777
 778 void afb_stub_ws_client_robustify(struct afb_stub_ws *stubws, struct fdev *(*reopen)(void*), void *closure, void (*release)(void*))
 779 {
 780         assert(stubws->is_client); /* check client */
 781
 782         if (stubws->robust.release)
 783                 stubws->robust.release(stubws->robust.closure);
 784
 785         stubws->robust.reopen = reopen;
 786         stubws->robust.closure = closure;
 787         stubws->robust.release = release;
 788 }