src/afb-api-ws.c

   1 /*
   2  * Copyright (C) 2015, 2016, 2017 "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 #define NO_PLUGIN_VERBOSE_MACRO
  20
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <assert.h>
  24 #include <fcntl.h>
  25 #include <unistd.h>
  26 #include <errno.h>
  27 #include <endian.h>
  28 #include <netdb.h>
  29 #include <sys/types.h>
  30 #include <sys/socket.h>
  31 #include <sys/un.h>
  32 #include <pthread.h>
  33
  34 #include <json-c/json.h>
  35 #include <systemd/sd-event.h>
  36
  37 #include <afb/afb-req-itf.h>
  38
  39 #include "afb-common.h"
  40
  41 #include "afb-session.h"
  42 #include "afb-cred.h"
  43 #include "afb-ws.h"
  44 #include "afb-msg-json.h"
  45 #include "afb-api.h"
  46 #include "afb-apiset.h"
  47 #include "afb-api-so.h"
  48 #include "afb-context.h"
  49 #include "afb-evt.h"
  50 #include "afb-xreq.h"
  51 #include "verbose.h"
  52 #include "sd-fds.h"
  53
  54 struct api_ws_memo;
  55 struct api_ws_event;
  56 struct api_ws_client;
  57
  58 #define CHAR_FOR_CALL             'C'
  59 #define CHAR_FOR_ANSWER_SUCCESS   'T'
  60 #define CHAR_FOR_ANSWER_FAIL      'F'
  61 #define CHAR_FOR_EVT_BROADCAST    '*'
  62 #define CHAR_FOR_EVT_ADD          '+'
  63 #define CHAR_FOR_EVT_DEL          '-'
  64 #define CHAR_FOR_EVT_PUSH         '!'
  65 #define CHAR_FOR_EVT_SUBSCRIBE    'S'
  66 #define CHAR_FOR_EVT_UNSUBSCRIBE  'U'
  67 #define CHAR_FOR_SUBCALL_CALL     'B'
  68 #define CHAR_FOR_SUBCALL_REPLY    'R'
  69
  70 /*
  71  */
  72 struct api_ws
  73 {
  74         char *path;             /* path of the object for the API */
  75         char *api;              /* api name of the interface */
  76         int fd;                 /* file descriptor */
  77         pthread_mutex_t mutex;  /**< resource control */
  78         union {
  79                 struct {
  80                         uint32_t id;
  81                         struct afb_ws *ws;
  82                         struct api_ws_event *events;
  83                         struct api_ws_memo *memos;
  84                 } client;
  85                 struct {
  86                         sd_event_source *listensrc; /**< systemd source for server socket */
  87                         struct afb_apiset *apiset;
  88                 } server;
  89         };
  90 };
  91
  92 #define RETOK   1
  93 #define RETERR  2
  94 #define RETRAW  3
  95
  96 /******************* websocket interface for client part **********************************/
  97
  98 static void api_ws_client_on_binary(void *closure, char *data, size_t size);
  99
 100 static const struct afb_ws_itf api_ws_client_ws_itf =
 101 {
 102         .on_close = NULL,
 103         .on_text = NULL,
 104         .on_binary = api_ws_client_on_binary,
 105         .on_error = NULL,
 106         .on_hangup = NULL
 107 };
 108
 109 /******************* event structures for server part **********************************/
 110
 111 static void api_ws_server_event_add(void *closure, const char *event, int eventid);
 112 static void api_ws_server_event_remove(void *closure, const char *event, int eventid);
 113 static void api_ws_server_event_push(void *closure, const char *event, int eventid, struct json_object *object);
 114 static void api_ws_server_event_broadcast(void *closure, const char *event, int eventid, struct json_object *object);
 115
 116 /* the interface for events pushing */
 117 static const struct afb_evt_itf api_ws_server_evt_itf = {
 118         .broadcast = api_ws_server_event_broadcast,
 119         .push = api_ws_server_event_push,
 120         .add = api_ws_server_event_add,
 121         .remove = api_ws_server_event_remove
 122 };
 123
 124 /******************* handling subcalls *****************************/
 125
 126 /**
 127  * Structure on server side for recording pending
 128  * subcalls.
 129  */
 130 struct api_ws_subcall
 131 {
 132         struct api_ws_subcall *next;    /**< next subcall for the client */
 133         uint32_t subcallid;             /**< the subcallid */
 134         void (*callback)(void*, int, struct json_object*); /**< callback on completion */
 135         void *closure;                  /**< closure of the callback */
 136 };
 137
 138 /**
 139  * Structure for sending back replies on client side
 140  */
 141 struct api_ws_reply
 142 {
 143         struct api_ws *apiws;   /**< api descriptor */
 144         uint32_t subcallid;     /**< subcallid for the reply */
 145 };
 146
 147 /******************* client description part for server *****************************/
 148
 149 struct api_ws_client
 150 {
 151         /* the server ws-api */
 152         const char *api;
 153
 154         /* count of references */
 155         int refcount;
 156
 157         /* file descriptor */
 158         int fd;
 159
 160         /* resource control */
 161         pthread_mutex_t mutex;
 162
 163         /* listener for events */
 164         struct afb_evt_listener *listener;
 165
 166         /* websocket */
 167         struct afb_ws *ws;
 168
 169         /* credentials */
 170         struct afb_cred *cred;
 171
 172         /* pending subcalls */
 173         struct api_ws_subcall *subcalls;
 174
 175         /* apiset */
 176         struct afb_apiset *apiset;
 177 };
 178
 179 /******************* websocket interface for client part **********************************/
 180
 181 static void api_ws_server_on_binary(void *closure, char *data, size_t size);
 182 static void api_ws_server_on_hangup(void *closure);
 183
 184 static const struct afb_ws_itf api_ws_server_ws_itf =
 185 {
 186         .on_close = NULL,
 187         .on_text = NULL,
 188         .on_binary = api_ws_server_on_binary,
 189         .on_error = NULL,
 190         .on_hangup = api_ws_server_on_hangup
 191 };
 192
 193 /******************* ws request part for server *****************/
 194
 195 /*
 196  * structure for a ws request
 197  */
 198 struct api_ws_server_req {
 199         struct afb_xreq xreq;           /* the xreq */
 200         struct api_ws_client *client;   /* the client of the request */
 201         uint32_t msgid;                 /* the incoming request msgid */
 202 };
 203
 204 static void api_ws_server_req_success_cb(struct afb_xreq *xreq, struct json_object *obj, const char *info);
 205 static void api_ws_server_req_fail_cb(struct afb_xreq *xreq, const char *status, const char *info);
 206 static void api_ws_server_req_destroy_cb(struct afb_xreq *xreq);
 207 static int api_ws_server_req_subscribe_cb(struct afb_xreq *xreq, struct afb_event event);
 208 static int api_ws_server_req_unsubscribe_cb(struct afb_xreq *xreq, struct afb_event event);
 209 static void api_ws_server_req_subcall_cb(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cb_closure);
 210
 211 const struct afb_xreq_query_itf afb_api_ws_xreq_itf = {
 212         .success = api_ws_server_req_success_cb,
 213         .fail = api_ws_server_req_fail_cb,
 214         .unref = api_ws_server_req_destroy_cb,
 215         .subcall = api_ws_server_req_subcall_cb,
 216         .subscribe = api_ws_server_req_subscribe_cb,
 217         .unsubscribe = api_ws_server_req_unsubscribe_cb
 218 };
 219
 220 /******************* common part **********************************/
 221
 222 /*
 223  * create a structure api_ws not connected to the 'path'.
 224  */
 225 static struct api_ws *api_ws_make(const char *path)
 226 {
 227         struct api_ws *api;
 228         size_t length;
 229
 230         /* allocates the structure */
 231         length = strlen(path);
 232         api = calloc(1, sizeof *api + 1 + length);
 233         if (api == NULL) {
 234                 errno = ENOMEM;
 235                 goto error;
 236         }
 237
 238         /* path is copied after the struct */
 239         api->path = (char*)(api+1);
 240         memcpy(api->path, path, length + 1);
 241
 242         /* api name is at the end of the path */
 243         while (length && path[length - 1] != '/' && path[length - 1] != ':')
 244                 length = length - 1;
 245         api->api = &api->path[length];
 246         if (api->api == NULL || !afb_api_is_valid_name(api->api)) {
 247                 errno = EINVAL;
 248                 goto error2;
 249         }
 250         pthread_mutex_init(&api->mutex, NULL);
 251
 252         api->fd = -1;
 253         return api;
 254
 255 error2:
 256         free(api);
 257 error:
 258         return NULL;
 259 }
 260
 261 static int api_ws_socket_unix(const char *path, int server)
 262 {
 263         int fd, rc;
 264         struct sockaddr_un addr;
 265         size_t length;
 266
 267         length = strlen(path);
 268         if (length >= 108) {
 269                 errno = ENAMETOOLONG;
 270                 return -1;
 271         }
 272
 273         if (server)
 274                 unlink(path);
 275
 276         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 277         if (fd < 0)
 278                 return fd;
 279
 280         memset(&addr, 0, sizeof addr);
 281         addr.sun_family = AF_UNIX;
 282         strcpy(addr.sun_path, path);
 283         if (server) {
 284                 rc = bind(fd, (struct sockaddr *) &addr, (socklen_t)(sizeof addr));
 285         } else {
 286                 rc = connect(fd, (struct sockaddr *) &addr, (socklen_t)(sizeof addr));
 287         }
 288         if (rc < 0) {
 289                 close(fd);
 290                 return rc;
 291         }
 292         return fd;
 293 }
 294
 295 static int api_ws_socket_inet(const char *path, int server)
 296 {
 297         int rc, fd;
 298         const char *service, *host, *api;
 299         struct addrinfo hint, *rai, *iai;
 300
 301         /* scan the uri */
 302         api = strrchr(path, '/');
 303         service = strrchr(path, ':');
 304         if (api == NULL || service == NULL || api < service) {
 305                 errno = EINVAL;
 306                 return -1;
 307         }
 308         host = strndupa(path, service++ - path);
 309         service = strndupa(service, api - service);
 310
 311         /* get addr */
 312         memset(&hint, 0, sizeof hint);
 313         hint.ai_family = AF_INET;
 314         hint.ai_socktype = SOCK_STREAM;
 315         rc = getaddrinfo(host, service, &hint, &rai);
 316         if (rc != 0) {
 317                 errno = EINVAL;
 318                 return -1;
 319         }
 320
 321         /* get the socket */
 322         iai = rai;
 323         while (iai != NULL) {
 324                 fd = socket(iai->ai_family, iai->ai_socktype, iai->ai_protocol);
 325                 if (fd >= 0) {
 326                         if (server) {
 327                                 rc = bind(fd, iai->ai_addr, iai->ai_addrlen);
 328                         } else {
 329                                 rc = connect(fd, iai->ai_addr, iai->ai_addrlen);
 330                         }
 331                         if (rc == 0) {
 332                                 freeaddrinfo(rai);
 333                                 return fd;
 334                         }
 335                         close(fd);
 336                 }
 337                 iai = iai->ai_next;
 338         }
 339         freeaddrinfo(rai);
 340         return -1;
 341
 342 }
 343
 344 static int api_ws_socket(const char *path, int server)
 345 {
 346         int fd, rc;
 347
 348         /* check for systemd socket */
 349         if (0 == strncmp(path, "sd:", 3))
 350                 fd = sd_fds_for(path + 3);
 351         else {
 352                 /* check for unix socket */
 353                 if (0 == strncmp(path, "unix:", 5))
 354                         /* unix socket */
 355                         fd = api_ws_socket_unix(path + 5, server);
 356                 else
 357                         /* inet socket */
 358                         fd = api_ws_socket_inet(path, server);
 359
 360                 if (fd >= 0 && server) {
 361                         rc = 1;
 362                         setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &rc, sizeof rc);
 363                         rc = listen(fd, 5);
 364                 }
 365         }
 366         /* configure the socket */
 367         if (fd >= 0) {
 368                 fcntl(fd, F_SETFD, FD_CLOEXEC);
 369                 fcntl(fd, F_SETFL, O_NONBLOCK);
 370         }
 371         return fd;
 372 }
 373
 374 /******************* serialisation part **********************************/
 375
 376 struct readbuf
 377 {
 378         char *head, *end;
 379 };
 380
 381 #define WRITEBUF_COUNT_MAX  32
 382 struct writebuf
 383 {
 384         struct iovec iovec[WRITEBUF_COUNT_MAX];
 385         uint32_t uints[WRITEBUF_COUNT_MAX];
 386         int count;
 387 };
 388
 389 static char *api_ws_read_get(struct readbuf *rb, uint32_t length)
 390 {
 391         char *before = rb->head;
 392         char *after = before + length;
 393         if (after > rb->end)
 394                 return 0;
 395         rb->head = after;
 396         return before;
 397 }
 398
 399 static int api_ws_read_char(struct readbuf *rb, char *value)
 400 {
 401         if (rb->head >= rb->end)
 402                 return 0;
 403         *value = *rb->head++;
 404         return 1;
 405 }
 406
 407 static int api_ws_read_uint32(struct readbuf *rb, uint32_t *value)
 408 {
 409         char *after = rb->head + sizeof *value;
 410         if (after > rb->end)
 411                 return 0;
 412         memcpy(value, rb->head, sizeof *value);
 413         rb->head = after;
 414         *value = le32toh(*value);
 415         return 1;
 416 }
 417
 418 static int api_ws_read_string(struct readbuf *rb, const char **value, size_t *length)
 419 {
 420         uint32_t len;
 421         if (!api_ws_read_uint32(rb, &len) || !len)
 422                 return 0;
 423         if (length)
 424                 *length = (size_t)(len - 1);
 425         return (*value = api_ws_read_get(rb, len)) != NULL &&  rb->head[-1] == 0;
 426 }
 427
 428 static int api_ws_read_object(struct readbuf *rb, struct json_object **object)
 429 {
 430         const char *string;
 431         struct json_object *o;
 432         int rc = api_ws_read_string(rb, &string, NULL);
 433         if (rc) {
 434                 o = json_tokener_parse(string);
 435                 if (o == NULL && strcmp(string, "null"))
 436                         o = json_object_new_string(string);
 437                 *object = o;
 438         }
 439         return rc;
 440 }
 441
 442 static int api_ws_write_put(struct writebuf *wb, const void *value, size_t length)
 443 {
 444         int i = wb->count;
 445         if (i == WRITEBUF_COUNT_MAX)
 446                 return 0;
 447         wb->iovec[i].iov_base = (void*)value;
 448         wb->iovec[i].iov_len = length;
 449         wb->count = i + 1;
 450         return 1;
 451 }
 452
 453 static int api_ws_write_char(struct writebuf *wb, char value)
 454 {
 455         int i = wb->count;
 456         if (i == WRITEBUF_COUNT_MAX)
 457                 return 0;
 458         *(char*)&wb->uints[i] = value;
 459         wb->iovec[i].iov_base = &wb->uints[i];
 460         wb->iovec[i].iov_len = 1;
 461         wb->count = i + 1;
 462         return 1;
 463 }
 464
 465 static int api_ws_write_uint32(struct writebuf *wb, uint32_t value)
 466 {
 467         int i = wb->count;
 468         if (i == WRITEBUF_COUNT_MAX)
 469                 return 0;
 470         wb->uints[i] = htole32(value);
 471         wb->iovec[i].iov_base = &wb->uints[i];
 472         wb->iovec[i].iov_len = sizeof wb->uints[i];
 473         wb->count = i + 1;
 474         return 1;
 475 }
 476
 477 static int api_ws_write_string_length(struct writebuf *wb, const char *value, size_t length)
 478 {
 479         uint32_t len = (uint32_t)++length;
 480         return (size_t)len == length && len && api_ws_write_uint32(wb, len) && api_ws_write_put(wb, value, length);
 481 }
 482
 483 static int api_ws_write_string(struct writebuf *wb, const char *value)
 484 {
 485         return api_ws_write_string_length(wb, value, strlen(value));
 486 }
 487
 488 static int api_ws_write_object(struct writebuf *wb, struct json_object *object)
 489 {
 490         const char *string = json_object_to_json_string_ext(object, JSON_C_TO_STRING_PLAIN);
 491         return string != NULL && api_ws_write_string(wb, string);
 492 }
 493
 494 /******************* client part **********************************/
 495
 496 /*
 497  * structure for recording query data
 498  */
 499 struct api_ws_memo {
 500         struct api_ws_memo *next;       /* the next memo */
 501         struct api_ws *api;             /* the ws api */
 502         struct afb_xreq *xreq;          /* the request handle */
 503         uint32_t msgid;                 /* the message identifier */
 504 };
 505
 506 struct api_ws_event
 507 {
 508         struct api_ws_event *next;
 509         struct afb_event event;
 510         int eventid;
 511         int refcount;
 512 };
 513
 514 /* search a memorized request */
 515 static struct api_ws_memo *api_ws_client_memo_search(struct api_ws *api, uint32_t msgid)
 516 {
 517         struct api_ws_memo *memo;
 518
 519         memo = api->client.memos;
 520         while (memo != NULL && memo->msgid != msgid)
 521                 memo = memo->next;
 522
 523         return memo;
 524 }
 525
 526 /* search the event */
 527 static struct api_ws_event *api_ws_client_event_search(struct api_ws *api, uint32_t eventid, const char *name)
 528 {
 529         struct api_ws_event *ev;
 530
 531         ev = api->client.events;
 532         while (ev != NULL && (ev->eventid != eventid || 0 != strcmp(afb_evt_event_name(ev->event), name)))
 533                 ev = ev->next;
 534
 535         return ev;
 536 }
 537
 538
 539 /* allocates and init the memorizing data */
 540 static struct api_ws_memo *api_ws_client_memo_make(struct api_ws *api, struct afb_xreq *xreq)
 541 {
 542         struct api_ws_memo *memo;
 543
 544         memo = malloc(sizeof *memo);
 545         if (memo != NULL) {
 546                 afb_xreq_addref(xreq);
 547                 memo->xreq = xreq;
 548                 do { memo->msgid = ++api->client.id; } while(api_ws_client_memo_search(api, memo->msgid) != NULL);
 549                 memo->api = api;
 550                 memo->next = api->client.memos;
 551                 api->client.memos = memo;
 552         }
 553         return memo;
 554 }
 555
 556 /* free and release the memorizing data */
 557 static void api_ws_client_memo_destroy(struct api_ws_memo *memo)
 558 {
 559         struct api_ws_memo **prv;
 560
 561         prv = &memo->api->client.memos;
 562         while (*prv != NULL) {
 563                 if (*prv == memo) {
 564                         *prv = memo->next;
 565                         break;
 566                 }
 567                 prv = &(*prv)->next;
 568         }
 569
 570         afb_xreq_unref(memo->xreq);
 571         free(memo);
 572 }
 573
 574 /* get event data from the message */
 575 static int api_ws_client_msg_event_read(struct readbuf *rb, uint32_t *eventid, const char **name)
 576 {
 577         return api_ws_read_uint32(rb, eventid) && api_ws_read_string(rb, name, NULL);
 578 }
 579
 580 /* get event from the message */
 581 static int api_ws_client_msg_event_get(struct api_ws *api, struct readbuf *rb, struct api_ws_event **ev)
 582 {
 583         const char *name;
 584         uint32_t eventid;
 585
 586         /* get event data from the message */
 587         if (!api_ws_client_msg_event_read(rb, &eventid, &name)) {
 588                 ERROR("Invalid message");
 589                 return 0;
 590         }
 591
 592         /* check conflicts */
 593         *ev = api_ws_client_event_search(api, eventid, name);
 594         if (*ev == NULL) {
 595                 ERROR("event %s not found", name);
 596                 return 0;
 597         }
 598
 599         return 1;
 600 }
 601
 602 /* get event from the message */
 603 static int api_ws_client_msg_memo_get(struct api_ws *api, struct readbuf *rb, struct api_ws_memo **memo)
 604 {
 605         uint32_t msgid;
 606
 607         /* get event data from the message */
 608         if (!api_ws_read_uint32(rb, &msgid)) {
 609                 ERROR("Invalid message");
 610                 return 0;
 611         }
 612
 613         /* get the memo */
 614         *memo = api_ws_client_memo_search(api, msgid);
 615         if (*memo == NULL) {
 616                 ERROR("message not found");
 617                 return 0;
 618         }
 619
 620         return 1;
 621 }
 622
 623 /* read a subscrition message */
 624 static int api_ws_client_msg_subscription_get(struct api_ws *api, struct readbuf *rb, struct api_ws_memo **memo, struct api_ws_event **ev)
 625 {
 626         return api_ws_client_msg_memo_get(api, rb, memo) && api_ws_client_msg_event_get(api, rb, ev);
 627 }
 628
 629 /* adds an event */
 630 static void api_ws_client_event_create(struct api_ws *api, struct readbuf *rb)
 631 {
 632         size_t offset;
 633         const char *name;
 634         uint32_t eventid;
 635         struct api_ws_event *ev;
 636
 637         /* get event data from the message */
 638         offset = api_ws_client_msg_event_read(rb, &eventid, &name);
 639         if (offset == 0) {
 640                 ERROR("Invalid message");
 641                 return;
 642         }
 643
 644         /* check conflicts */
 645         ev = api_ws_client_event_search(api, eventid, name);
 646         if (ev != NULL) {
 647                 ev->refcount++;
 648                 return;
 649         }
 650
 651         /* no conflict, try to add it */
 652         ev = malloc(sizeof *ev);
 653         if (ev != NULL) {
 654                 ev->event = afb_evt_create_event(name);
 655                 if (ev->event.closure == NULL)
 656                         free(ev);
 657                 else {
 658                         ev->refcount = 1;
 659                         ev->eventid = eventid;
 660                         ev->next = api->client.events;
 661                         api->client.events = ev;
 662                         return;
 663                 }
 664         }
 665         ERROR("can't create event %s, out of memory", name);
 666 }
 667
 668 /* removes an event */
 669 static void api_ws_client_event_drop(struct api_ws *api, struct readbuf *rb)
 670 {
 671         struct api_ws_event *ev, **prv;
 672
 673         /* retrieves the event */
 674         if (!api_ws_client_msg_event_get(api, rb, &ev))
 675                 return;
 676
 677         /* decrease the reference count */
 678         if (--ev->refcount)
 679                 return;
 680
 681         /* unlinks the event */
 682         prv = &api->client.events;
 683         while (*prv != ev)
 684                 prv = &(*prv)->next;
 685         *prv = ev->next;
 686
 687         /* destroys the event */
 688         afb_event_drop(ev->event);
 689         free(ev);
 690 }
 691
 692 /* subscribes an event */
 693 static void api_ws_client_event_subscribe(struct api_ws *api, struct readbuf *rb)
 694 {
 695         struct api_ws_event *ev;
 696         struct api_ws_memo *memo;
 697
 698         if (api_ws_client_msg_subscription_get(api, rb, &memo, &ev)) {
 699                 /* subscribe the request from the event */
 700                 if (afb_xreq_subscribe(memo->xreq, ev->event) < 0)
 701                         ERROR("can't subscribe: %m");
 702         }
 703 }
 704
 705 /* unsubscribes an event */
 706 static void api_ws_client_event_unsubscribe(struct api_ws *api, struct readbuf *rb)
 707 {
 708         struct api_ws_event *ev;
 709         struct api_ws_memo *memo;
 710
 711         if (api_ws_client_msg_subscription_get(api, rb, &memo, &ev)) {
 712                 /* unsubscribe the request from the event */
 713                 if (afb_xreq_unsubscribe(memo->xreq, ev->event) < 0)
 714                         ERROR("can't unsubscribe: %m");
 715         }
 716 }
 717
 718 /* receives broadcasted events */
 719 static void api_ws_client_event_broadcast(struct api_ws *api, struct readbuf *rb)
 720 {
 721         struct json_object *object;
 722         const char *event;
 723
 724         if (api_ws_read_string(rb, &event, NULL) && api_ws_read_object(rb, &object))
 725                 afb_evt_broadcast(event, object);
 726         else
 727                 ERROR("unreadable broadcasted event");
 728 }
 729
 730 /* pushs an event */
 731 static void api_ws_client_event_push(struct api_ws *api, struct readbuf *rb)
 732 {
 733         struct api_ws_event *ev;
 734         struct json_object *object;
 735
 736         if (api_ws_client_msg_event_get(api, rb, &ev) && api_ws_read_object(rb, &object))
 737                 afb_event_push(ev->event, object);
 738         else
 739                 ERROR("unreadable push event");
 740 }
 741
 742 static void api_ws_client_reply_success(struct api_ws *api, struct readbuf *rb)
 743 {
 744         struct api_ws_memo *memo;
 745         struct json_object *object;
 746         const char *info;
 747         uint32_t flags;
 748
 749         /* retrieve the message data */
 750         if (!api_ws_client_msg_memo_get(api, rb, &memo))
 751                 return;
 752
 753         if (api_ws_read_uint32(rb, &flags)
 754          && api_ws_read_string(rb, &info, NULL)
 755          && api_ws_read_object(rb, &object)) {
 756                 memo->xreq->context.flags = (unsigned)flags;
 757                 afb_xreq_success(memo->xreq, object, *info ? info : NULL);
 758         } else {
 759                 /* failing to have the answer */
 760                 afb_xreq_fail(memo->xreq, "error", "ws error");
 761         }
 762         api_ws_client_memo_destroy(memo);
 763 }
 764
 765 static void api_ws_client_reply_fail(struct api_ws *api, struct readbuf *rb)
 766 {
 767         struct api_ws_memo *memo;
 768         const char *info, *status;
 769         uint32_t flags;
 770
 771         /* retrieve the message data */
 772         if (!api_ws_client_msg_memo_get(api, rb, &memo))
 773                 return;
 774
 775         if (api_ws_read_uint32(rb, &flags)
 776          && api_ws_read_string(rb, &status, NULL)
 777          && api_ws_read_string(rb, &info, NULL)) {
 778                 memo->xreq->context.flags = (unsigned)flags;
 779                 afb_xreq_fail(memo->xreq, status, *info ? info : NULL);
 780         } else {
 781                 /* failing to have the answer */
 782                 afb_xreq_fail(memo->xreq, "error", "ws error");
 783         }
 784         api_ws_client_memo_destroy(memo);
 785 }
 786
 787 /* send a subcall reply */
 788 static void api_ws_client_send_subcall_reply(struct api_ws_reply *reply, int iserror, json_object *object)
 789 {
 790         int rc;
 791         struct writebuf wb = { .count = 0 };
 792         char ie = (char)!!iserror;
 793
 794         if (!api_ws_write_char(&wb, CHAR_FOR_SUBCALL_REPLY)
 795          || !api_ws_write_uint32(&wb, reply->subcallid)
 796          || !api_ws_write_char(&wb, ie)
 797          || !api_ws_write_object(&wb, object)) {
 798                 /* write error ? */
 799                 return;
 800         }
 801
 802         rc = afb_ws_binary_v(reply->apiws->client.ws, wb.iovec, wb.count);
 803         if (rc >= 0)
 804                 return;
 805         ERROR("error while sending subcall reply");
 806 }
 807
 808 /* callback for subcall reply */
 809 static void api_ws_client_subcall_reply_cb(void *closure, int iserror, json_object *object)
 810 {
 811         api_ws_client_send_subcall_reply(closure, iserror, object);
 812         free(closure);
 813 }
 814
 815 /* received a subcall request */
 816 static void api_ws_client_subcall(struct api_ws *apiws, struct readbuf *rb)
 817 {
 818         struct api_ws_reply *reply;
 819         struct api_ws_memo *memo;
 820         const char *api, *verb;
 821         uint32_t subcallid;
 822         struct json_object *object;
 823
 824         reply = malloc(sizeof *reply);
 825         if (!reply)
 826                 return;
 827
 828         /* retrieve the message data */
 829         if (!api_ws_client_msg_memo_get(apiws, rb, &memo))
 830                 return;
 831
 832         if (api_ws_read_uint32(rb, &subcallid)
 833          && api_ws_read_string(rb, &api, NULL)
 834          && api_ws_read_string(rb, &verb, NULL)
 835          && api_ws_read_object(rb, &object)) {
 836                 reply->apiws = apiws;
 837                 reply->subcallid = subcallid;
 838                 afb_xreq_subcall(memo->xreq, api, verb, object, api_ws_client_subcall_reply_cb, reply);
 839         }
 840 }
 841
 842 /* callback when receiving binary data */
 843 static void api_ws_client_on_binary(void *closure, char *data, size_t size)
 844 {
 845         if (size > 0) {
 846                 struct api_ws *apiws = closure;
 847                 struct readbuf rb = { .head = data, .end = data + size };
 848
 849                 pthread_mutex_lock(&apiws->mutex);
 850                 switch (*rb.head++) {
 851                 case CHAR_FOR_ANSWER_SUCCESS: /* success */
 852                         api_ws_client_reply_success(apiws, &rb);
 853                         break;
 854                 case CHAR_FOR_ANSWER_FAIL: /* fail */
 855                         api_ws_client_reply_fail(apiws, &rb);
 856                         break;
 857                 case CHAR_FOR_EVT_BROADCAST: /* broadcast */
 858                         api_ws_client_event_broadcast(apiws, &rb);
 859                         break;
 860                 case CHAR_FOR_EVT_ADD: /* creates the event */
 861                         api_ws_client_event_create(apiws, &rb);
 862                         break;
 863                 case CHAR_FOR_EVT_DEL: /* drops the event */
 864                         api_ws_client_event_drop(apiws, &rb);
 865                         break;
 866                 case CHAR_FOR_EVT_PUSH: /* pushs the event */
 867                         api_ws_client_event_push(apiws, &rb);
 868                         break;
 869                 case CHAR_FOR_EVT_SUBSCRIBE: /* subscribe event for a request */
 870                         api_ws_client_event_subscribe(apiws, &rb);
 871                         break;
 872                 case CHAR_FOR_EVT_UNSUBSCRIBE: /* unsubscribe event for a request */
 873                         api_ws_client_event_unsubscribe(apiws, &rb);
 874                         break;
 875                 case CHAR_FOR_SUBCALL_CALL: /* subcall */
 876                         api_ws_client_subcall(apiws, &rb);
 877                         break;
 878                 default: /* unexpected message */
 879                         /* TODO: close the connection */
 880                         break;
 881                 }
 882                 pthread_mutex_unlock(&apiws->mutex);
 883         }
 884         free(data);
 885 }
 886
 887 /* on call, propagate it to the ws service */
 888 static void api_ws_client_call_cb(void * closure, struct afb_xreq *xreq)
 889 {
 890         int rc;
 891         struct api_ws_memo *memo;
 892         struct writebuf wb = { .count = 0 };
 893         const char *raw;
 894         size_t szraw;
 895         struct api_ws *apiws = closure;
 896
 897         pthread_mutex_lock(&apiws->mutex);
 898
 899         /* create the recording data */
 900         memo = api_ws_client_memo_make(apiws, xreq);
 901         if (memo == NULL) {
 902                 afb_xreq_fail_f(xreq, "error", "out of memory");
 903                 goto end;
 904         }
 905
 906         /* creates the call message */
 907         raw = afb_xreq_raw(xreq, &szraw);
 908         if (raw == NULL)
 909                 goto internal_error;
 910         if (!api_ws_write_char(&wb, CHAR_FOR_CALL)
 911          || !api_ws_write_uint32(&wb, memo->msgid)
 912          || !api_ws_write_uint32(&wb, (uint32_t)xreq->context.flags)
 913          || !api_ws_write_string(&wb, xreq->verb)
 914          || !api_ws_write_string(&wb, afb_session_uuid(xreq->context.session))
 915          || !api_ws_write_string_length(&wb, raw, szraw))
 916                 goto overflow;
 917
 918         /* send */
 919         rc = afb_ws_binary_v(apiws->client.ws, wb.iovec, wb.count);
 920         if (rc >= 0)
 921                 goto end;
 922
 923         afb_xreq_fail(xreq, "error", "websocket sending error");
 924         goto clean_memo;
 925
 926 internal_error:
 927         afb_xreq_fail(xreq, "error", "internal: raw is NULL!");
 928         goto clean_memo;
 929
 930 overflow:
 931         afb_xreq_fail(xreq, "error", "overflow: size doesn't match 32 bits!");
 932
 933 clean_memo:
 934         api_ws_client_memo_destroy(memo);
 935 end:
 936         pthread_mutex_unlock(&apiws->mutex);
 937 }
 938
 939 /*  */
 940 static void api_ws_client_disconnect(struct api_ws *api)
 941 {
 942         if (api->fd >= 0) {
 943                 afb_ws_destroy(api->client.ws);
 944                 api->client.ws = NULL;
 945                 close(api->fd);
 946                 api->fd = -1;
 947         }
 948 }
 949
 950 /*  */
 951 static int api_ws_client_connect(struct api_ws *api)
 952 {
 953         struct afb_ws *ws;
 954         int fd;
 955
 956         fd = api_ws_socket(api->path, 0);
 957         if (fd >= 0) {
 958                 ws = afb_ws_create(afb_common_get_event_loop(), fd, &api_ws_client_ws_itf, api);
 959                 if (ws != NULL) {
 960                         api->client.ws = ws;
 961                         api->fd = fd;
 962                         return 0;
 963                 }
 964                 close(fd);
 965         }
 966         return -1;
 967 }
 968
 969 static struct afb_api_itf ws_api_itf = {
 970         .call = api_ws_client_call_cb
 971 };
 972
 973 /* adds a afb-ws-service client api */
 974 int afb_api_ws_add_client(const char *path, struct afb_apiset *apiset)
 975 {
 976         int rc;
 977         struct api_ws *api;
 978         struct afb_api afb_api;
 979
 980         /* create the ws client api */
 981         api = api_ws_make(path);
 982         if (api == NULL)
 983                 goto error;
 984
 985         /* connect to the service */
 986         rc = api_ws_client_connect(api);
 987         if (rc < 0) {
 988                 ERROR("can't connect to ws service %s", api->path);
 989                 goto error2;
 990         }
 991
 992         /* record it as an API */
 993         afb_api.closure = api;
 994         afb_api.itf = &ws_api_itf;
 995         if (afb_apiset_add(apiset, api->api, afb_api) < 0)
 996                 goto error3;
 997
 998         return 0;
 999
1000 error3:
1001         api_ws_client_disconnect(api);
1002 error2:
1003         free(api);
1004 error:
1005         return -1;
1006 }
1007
1008 /******************* client description part for server *****************************/
1009
1010 static void api_ws_server_client_unref(struct api_ws_client *client)
1011 {
1012         struct api_ws_subcall *sc, *nsc;
1013
1014         if (!__atomic_sub_fetch(&client->refcount, 1, __ATOMIC_RELAXED)) {
1015                 afb_evt_listener_unref(client->listener);
1016                 afb_ws_destroy(client->ws);
1017                 nsc = client->subcalls;
1018                 while (nsc) {
1019                         sc= nsc;
1020                         nsc = sc->next;
1021                         sc->callback(sc->closure, 1, NULL);
1022                         free(sc);
1023                 }
1024                 afb_cred_unref(client->cred);
1025                 afb_apiset_unref(client->apiset);
1026                 free(client);
1027         }
1028 }
1029
1030 static void api_ws_server_client_addref(struct api_ws_client *client)
1031 {
1032         __atomic_add_fetch(&client->refcount, 1, __ATOMIC_RELAXED);
1033 }
1034
1035 /* on call, propagate it to the ws service */
1036 static void api_ws_server_on_call(struct api_ws_client *client, struct readbuf *rb)
1037 {
1038         struct api_ws_server_req *wreq;
1039         char *cverb;
1040         const char *uuid, *verb;
1041         uint32_t flags, msgid;
1042         size_t lenverb;
1043         struct json_object *object;
1044
1045         api_ws_server_client_addref(client);
1046
1047         /* reads the call message data */
1048         if (!api_ws_read_uint32(rb, &msgid)
1049          || !api_ws_read_uint32(rb, &flags)
1050          || !api_ws_read_string(rb, &verb, &lenverb)
1051          || !api_ws_read_string(rb, &uuid, NULL)
1052          || !api_ws_read_object(rb, &object))
1053                 goto overflow;
1054
1055         /* create the request */
1056         wreq = malloc(++lenverb + sizeof *wreq);
1057         if (wreq == NULL)
1058                 goto out_of_memory;
1059
1060         afb_xreq_init(&wreq->xreq, &afb_api_ws_xreq_itf);
1061         wreq->client = client;
1062         wreq->msgid = msgid;
1063         cverb = (char*)&wreq[1];
1064         memcpy(cverb, verb, lenverb);
1065
1066         /* init the context */
1067         if (afb_context_connect(&wreq->xreq.context, uuid, NULL) < 0)
1068                 goto unconnected;
1069         wreq->xreq.context.flags = flags;
1070
1071         /* makes the call */
1072         wreq->xreq.cred = afb_cred_addref(client->cred);
1073         wreq->xreq.api = client->api;
1074         wreq->xreq.verb = cverb;
1075         wreq->xreq.json = object;
1076         afb_xreq_process(&wreq->xreq, client->apiset);
1077         return;
1078
1079 unconnected:
1080         free(wreq);
1081 out_of_memory:
1082         json_object_put(object);
1083 overflow:
1084         api_ws_server_client_unref(client);
1085 }
1086
1087 /* on subcall reply */
1088 static void api_ws_server_on_subcall_reply(struct api_ws_client *client, struct readbuf *rb)
1089 {
1090         char iserror;
1091         uint32_t subcallid;
1092         struct json_object *object;
1093         struct api_ws_subcall *sc, **psc;
1094
1095         /* reads the call message data */
1096         if (!api_ws_read_uint32(rb, &subcallid)
1097          || !api_ws_read_char(rb, &iserror)
1098          || !api_ws_read_object(rb, &object)) {
1099                 /* TODO bad protocol */
1100                 return;
1101         }
1102
1103         /* search the subcall and unlink it */
1104         pthread_mutex_lock(&client->mutex);
1105         psc = &client->subcalls;
1106         while ((sc = *psc) && sc->subcallid != subcallid)
1107                 psc = &sc->next;
1108         if (!sc) {
1109                 pthread_mutex_unlock(&client->mutex);
1110                 /* TODO subcall not found */
1111         } else {
1112                 *psc = sc->next;
1113                 pthread_mutex_unlock(&client->mutex);
1114                 sc->callback(sc->closure, (int)iserror, object);
1115                 free(sc);
1116         }
1117         json_object_put(object);
1118 }
1119
1120 /* callback when receiving binary data */
1121 static void api_ws_server_on_binary(void *closure, char *data, size_t size)
1122 {
1123         if (size > 0) {
1124                 struct readbuf rb = { .head = data, .end = data + size };
1125                 switch (*rb.head++) {
1126                 case CHAR_FOR_CALL:
1127                         api_ws_server_on_call(closure, &rb);
1128                         break;
1129                 case CHAR_FOR_SUBCALL_REPLY:
1130                         api_ws_server_on_subcall_reply(closure, &rb);
1131                         break;
1132                 default: /* unexpected message */
1133                         /* TODO: close the connection */
1134                         break;
1135                 }
1136         }
1137         free(data);
1138 }
1139
1140 /* callback when receiving a hangup */
1141 static void api_ws_server_on_hangup(void *closure)
1142 {
1143         struct api_ws_client *client = closure;
1144
1145         /* close the socket */
1146         if (client->fd >= 0) {
1147                 close(client->fd);
1148                 client->fd = -1;
1149         }
1150
1151         /* release the client */
1152         api_ws_server_client_unref(client);
1153 }
1154
1155 static void api_ws_server_accept(struct api_ws *api)
1156 {
1157         struct api_ws_client *client;
1158         struct sockaddr addr;
1159         socklen_t lenaddr;
1160
1161         client = calloc(1, sizeof *client);
1162         if (client != NULL) {
1163                 client->listener = afb_evt_listener_create(&api_ws_server_evt_itf, client);
1164                 if (client->listener != NULL) {
1165                         lenaddr = (socklen_t)sizeof addr;
1166                         client->fd = accept(api->fd, &addr, &lenaddr);
1167                         if (client->fd >= 0) {
1168                                 client->cred = afb_cred_create_for_socket(client->fd);
1169                                 fcntl(client->fd, F_SETFD, FD_CLOEXEC);
1170                                 fcntl(client->fd, F_SETFL, O_NONBLOCK);
1171                                 client->ws = afb_ws_create(afb_common_get_event_loop(), client->fd, &api_ws_server_ws_itf, client);
1172                                 if (client->ws != NULL) {
1173                                         client->api = api->api;
1174                                         client->apiset = afb_apiset_addref(api->server.apiset);
1175                                         client->refcount = 1;
1176                                         client->subcalls = NULL;
1177                                         return;
1178                                 }
1179                                 afb_cred_unref(client->cred);
1180                                 close(client->fd);
1181                         }
1182                         afb_evt_listener_unref(client->listener);
1183                 }
1184                 free(client);
1185         }
1186 }
1187
1188 /******************* server part: manage events **********************************/
1189
1190 static void api_ws_server_event_send(struct api_ws_client *client, char order, const char *event, int eventid, const char *data)
1191 {
1192         int rc;
1193         struct writebuf wb = { .count = 0 };
1194
1195         if (api_ws_write_char(&wb, order)
1196          && api_ws_write_uint32(&wb, eventid)
1197          && api_ws_write_string(&wb, event)
1198          && (data == NULL || api_ws_write_string(&wb, data))) {
1199                 rc = afb_ws_binary_v(client->ws, wb.iovec, wb.count);
1200                 if (rc >= 0)
1201                         return;
1202         }
1203         ERROR("error while sending %c for event %s", order, event);
1204 }
1205
1206 static void api_ws_server_event_add(void *closure, const char *event, int eventid)
1207 {
1208         api_ws_server_event_send(closure, CHAR_FOR_EVT_ADD, event, eventid, NULL);
1209 }
1210
1211 static void api_ws_server_event_remove(void *closure, const char *event, int eventid)
1212 {
1213         api_ws_server_event_send(closure, CHAR_FOR_EVT_DEL, event, eventid, NULL);
1214 }
1215
1216 static void api_ws_server_event_push(void *closure, const char *event, int eventid, struct json_object *object)
1217 {
1218         const char *data = json_object_to_json_string_ext(object, JSON_C_TO_STRING_PLAIN);
1219         api_ws_server_event_send(closure, CHAR_FOR_EVT_PUSH, event, eventid, data ? : "null");
1220         json_object_put(object);
1221 }
1222
1223 static void api_ws_server_event_broadcast(void *closure, const char *event, int eventid, struct json_object *object)
1224 {
1225         int rc;
1226         struct api_ws_client *client = closure;
1227
1228         struct writebuf wb = { .count = 0 };
1229
1230         if (api_ws_write_char(&wb, CHAR_FOR_EVT_BROADCAST) && api_ws_write_string(&wb, event) && api_ws_write_object(&wb, object)) {
1231                 rc = afb_ws_binary_v(client->ws, wb.iovec, wb.count);
1232                 if (rc < 0)
1233                         ERROR("error while broadcasting event %s", event);
1234         } else
1235                 ERROR("error while broadcasting event %s", event);
1236         json_object_put(object);
1237 }
1238
1239 /******************* ws request part for server *****************/
1240
1241 /* decrement the reference count of the request and free/release it on falling to null */
1242 static void api_ws_server_req_destroy_cb(struct afb_xreq *xreq)
1243 {
1244         struct api_ws_server_req *wreq = CONTAINER_OF_XREQ(struct api_ws_server_req, xreq);
1245
1246         afb_context_disconnect(&wreq->xreq.context);
1247         afb_cred_unref(wreq->xreq.cred);
1248         json_object_put(wreq->xreq.json);
1249         api_ws_server_client_unref(wreq->client);
1250         free(wreq);
1251 }
1252
1253 static void api_ws_server_req_success_cb(struct afb_xreq *xreq, struct json_object *obj, const char *info)
1254 {
1255         int rc;
1256         struct writebuf wb = { .count = 0 };
1257         struct api_ws_server_req *wreq = CONTAINER_OF_XREQ(struct api_ws_server_req, xreq);
1258
1259         if (api_ws_write_char(&wb, CHAR_FOR_ANSWER_SUCCESS)
1260          && api_ws_write_uint32(&wb, wreq->msgid)
1261          && api_ws_write_uint32(&wb, (uint32_t)wreq->xreq.context.flags)
1262          && api_ws_write_string(&wb, info ? : "")
1263          && api_ws_write_object(&wb, obj)) {
1264                 rc = afb_ws_binary_v(wreq->client->ws, wb.iovec, wb.count);
1265                 if (rc >= 0)
1266                         goto success;
1267         }
1268         ERROR("error while sending success");
1269 success:
1270         json_object_put(obj);
1271 }
1272
1273 static void api_ws_server_req_fail_cb(struct afb_xreq *xreq, const char *status, const char *info)
1274 {
1275         int rc;
1276         struct writebuf wb = { .count = 0 };
1277         struct api_ws_server_req *wreq = CONTAINER_OF_XREQ(struct api_ws_server_req, xreq);
1278
1279         if (api_ws_write_char(&wb, CHAR_FOR_ANSWER_FAIL)
1280          && api_ws_write_uint32(&wb, wreq->msgid)
1281          && api_ws_write_uint32(&wb, (uint32_t)wreq->xreq.context.flags)
1282          && api_ws_write_string(&wb, status)
1283          && api_ws_write_string(&wb, info ? : "")) {
1284                 rc = afb_ws_binary_v(wreq->client->ws, wb.iovec, wb.count);
1285                 if (rc >= 0)
1286                         return;
1287         }
1288         ERROR("error while sending fail");
1289 }
1290
1291 static void api_ws_server_req_subcall_cb(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cb_closure)
1292 {
1293         int rc;
1294         struct writebuf wb = { .count = 0 };
1295         struct api_ws_subcall *sc, *osc;
1296         struct api_ws_server_req *wreq = CONTAINER_OF_XREQ(struct api_ws_server_req, xreq);
1297         struct api_ws_client *client = wreq->client;
1298
1299         sc = malloc(sizeof *sc);
1300         if (!sc) {
1301
1302         } else {
1303                 sc->callback = callback;
1304                 sc->closure = cb_closure;
1305
1306                 pthread_mutex_unlock(&client->mutex);
1307                 sc->subcallid = (uint32_t)(((intptr_t)sc) >> 6);
1308                 do {
1309                         sc->subcallid++;
1310                         osc = client->subcalls;
1311                         while(osc && osc->subcallid != sc->subcallid)
1312                                 osc = osc->next;
1313                 } while (osc);
1314                 sc->next = client->subcalls;
1315                 client->subcalls = sc;
1316                 pthread_mutex_unlock(&client->mutex);
1317
1318                 if (api_ws_write_char(&wb, CHAR_FOR_SUBCALL_CALL)
1319                  && api_ws_write_uint32(&wb, wreq->msgid)
1320                  && api_ws_write_uint32(&wb, sc->subcallid)
1321                  && api_ws_write_string(&wb, api)
1322                  && api_ws_write_string(&wb, verb)
1323                  && api_ws_write_object(&wb, args)) {
1324                         rc = afb_ws_binary_v(wreq->client->ws, wb.iovec, wb.count);
1325                         if (rc >= 0)
1326                                 return;
1327                 }
1328                 ERROR("error while sending fail");
1329         }
1330 }
1331
1332 static int api_ws_server_req_subscribe_cb(struct afb_xreq *xreq, struct afb_event event)
1333 {
1334         int rc, rc2;
1335         struct writebuf wb = { .count = 0 };
1336         struct api_ws_server_req *wreq = CONTAINER_OF_XREQ(struct api_ws_server_req, xreq);
1337
1338         rc = afb_evt_add_watch(wreq->client->listener, event);
1339         if (rc < 0)
1340                 return rc;
1341
1342         if (api_ws_write_char(&wb, CHAR_FOR_EVT_SUBSCRIBE)
1343          && api_ws_write_uint32(&wb, wreq->msgid)
1344          && api_ws_write_uint32(&wb, (uint32_t)afb_evt_event_id(event))
1345          && api_ws_write_string(&wb, afb_evt_event_name(event))) {
1346                 rc2 = afb_ws_binary_v(wreq->client->ws, wb.iovec, wb.count);
1347                 if (rc2 >= 0)
1348                         goto success;
1349         }
1350         ERROR("error while subscribing event");
1351 success:
1352         return rc;
1353 }
1354
1355 static int api_ws_server_req_unsubscribe_cb(struct afb_xreq *xreq, struct afb_event event)
1356 {
1357         int rc, rc2;
1358         struct writebuf wb = { .count = 0 };
1359         struct api_ws_server_req *wreq = CONTAINER_OF_XREQ(struct api_ws_server_req, xreq);
1360
1361         if (api_ws_write_char(&wb, CHAR_FOR_EVT_UNSUBSCRIBE)
1362          && api_ws_write_uint32(&wb, wreq->msgid)
1363          && api_ws_write_uint32(&wb, (uint32_t)afb_evt_event_id(event))
1364          && api_ws_write_string(&wb, afb_evt_event_name(event))) {
1365                 rc2 = afb_ws_binary_v(wreq->client->ws, wb.iovec, wb.count);
1366                 if (rc2 >= 0)
1367                         goto success;
1368         }
1369         ERROR("error while subscribing event");
1370 success:
1371         rc = afb_evt_remove_watch(wreq->client->listener, event);
1372         return rc;
1373 }
1374
1375 /******************* server part **********************************/
1376
1377 static int api_ws_server_connect(struct api_ws *api);
1378
1379 static int api_ws_server_listen_callback(sd_event_source *src, int fd, uint32_t revents, void *closure)
1380 {
1381         if ((revents & EPOLLIN) != 0)
1382                 api_ws_server_accept(closure);
1383         if ((revents & EPOLLHUP) != 0)
1384                 api_ws_server_connect(closure);
1385         return 0;
1386 }
1387
1388 static void api_ws_server_disconnect(struct api_ws *api)
1389 {
1390         if (api->server.listensrc != NULL) {
1391                 sd_event_source_unref(api->server.listensrc);
1392                 api->server.listensrc = NULL;
1393         }
1394         if (api->fd >= 0) {
1395                 close(api->fd);
1396                 api->fd = -1;
1397         }
1398 }
1399
1400 static int api_ws_server_connect(struct api_ws *api)
1401 {
1402         int rc;
1403
1404         /* ensure disconnected */
1405         api_ws_server_disconnect(api);
1406
1407         /* request the service object name */
1408         api->fd = api_ws_socket(api->path, 1);
1409         if (api->fd < 0)
1410                 ERROR("can't create socket %s", api->path);
1411         else {
1412                 /* listen for service */
1413                 rc = sd_event_add_io(afb_common_get_event_loop(), &api->server.listensrc, api->fd, EPOLLIN, api_ws_server_listen_callback, api);
1414                 if (rc >= 0)
1415                         return 0;
1416                 close(api->fd);
1417                 errno = -rc;
1418                 ERROR("can't add ws object %s", api->path);
1419         }
1420         return -1;
1421 }
1422
1423 /* create the service */
1424 int afb_api_ws_add_server(const char *path, struct afb_apiset *apiset)
1425 {
1426         int rc;
1427         struct api_ws *api;
1428
1429         /* creates the ws api object */
1430         api = api_ws_make(path);
1431         if (api == NULL)
1432                 goto error;
1433
1434         /* connect for serving */
1435         rc = api_ws_server_connect(api);
1436         if (rc < 0)
1437                 goto error2;
1438
1439         api->server.apiset = afb_apiset_addref(apiset);
1440         return 0;
1441
1442 error2:
1443         free(api);
1444 error:
1445         return -1;
1446 }
1447
1448