src/iop.c

   1 /**************************************************************************/
   2 /* ---------------------------------------------------------------------- */
   3 /* Copyright (C) 2006 - 2008 FRESCOR consortium partners:                 */
   4 /*                                                                        */
   5 /*   Universidad de Cantabria,              SPAIN                         */
   6 /*   University of York,                    UK                            */
   7 /*   Scuola Superiore Sant'Anna,            ITALY                         */
   8 /*   Kaiserslautern University,             GERMANY                       */
   9 /*   Univ. Politécnica  Valencia,           SPAIN                        */
  10 /*   Czech Technical University in Prague,  CZECH REPUBLIC                */
  11 /*   ENEA                                   SWEDEN                        */
  12 /*   Thales Communication S.A.              FRANCE                        */
  13 /*   Visual Tools S.A.                      SPAIN                         */
  14 /*   Rapita Systems Ltd                     UK                            */
  15 /*   Evidence                               ITALY                         */
  16 /*                                                                        */
  17 /*   See http://www.frescor.org for a link to partners' websites          */
  18 /*                                                                        */
  19 /*          FRESCOR project (FP6/2005/IST/5-034026) is funded             */
  20 /*       in part by the European Union Sixth Framework Programme          */
  21 /*       The European Union is not liable of any use that may be          */
  22 /*       made of this code.                                               */
  23 /*                                                                        */
  24 /*                                                                        */
  25 /*  This file is part of FORB (Frescor Object Request Broker)             */
  26 /*                                                                        */
  27 /* FORB is free software; you can redistribute it and/or modify it        */
  28 /* under terms of the GNU General Public License as published by the      */
  29 /* Free Software Foundation; either version 2, or (at your option) any    */
  30 /* later version.  FORB is distributed in the hope that it will be        */
  31 /* useful, but WITHOUT ANY WARRANTY; without even the implied warranty    */
  32 /* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU    */
  33 /* General Public License for more details. You should have received a    */
  34 /* copy of the GNU General Public License along with FORB; see file       */
  35 /* COPYING. If not, write to the Free Software Foundation, 675 Mass Ave,  */
  36 /* Cambridge, MA 02139, USA.                                              */
  37 /*                                                                        */
  38 /* As a special exception, including FORB header files in a file,         */
  39 /* instantiating FORB generics or templates, or linking other files       */
  40 /* with FORB objects to produce an executable application, does not       */
  41 /* by itself cause the resulting executable application to be covered     */
  42 /* by the GNU General Public License. This exception does not             */
  43 /* however invalidate any other reasons why the executable file might be  */
  44 /* covered by the GNU Public License.                                     */
  45 /**************************************************************************/
  46
  47 /**
  48  * @file   iop.c
  49  * @author Michal Sojka <sojkam1@fel.cvut.cz>
  50  * @date   Mon Sep  1 21:51:58 2008
  51  *
  52  * @brief  Implementation of Inter-ORB protocol.
  53  *
  54  *
  55  */
  56 #include "iop.h"
  57 #include <forb/cdr.h>
  58 #include <forb/object.h>
  59 #include "proto.h"
  60 #include <ul_log.h>
  61 #include "exec_req.h"
  62 #include <errno.h>
  63 #include "peer.h"
  64 #include "discovery.h"
  65
  66 /** Version of the protocol */
  67 #define VER_MAJOR 0
  68 #define VER_MINOR 0
  69
  70 #define VER(major, minor) ((major)<<8 || (minor))
  71
  72 extern UL_LOG_CUST(ulogd_forb_iop);
  73
  74
  75 CORBA_boolean
  76 forb_iop_prepend_message_header(FORB_CDR_Codec *codec, forb_iop_message_type mt)
  77 {
  78         CORBA_boolean ret;
  79         forb_iop_message_header mh;
  80         mh.proto_version.major = VER_MAJOR;
  81         mh.proto_version.minor = VER_MINOR;
  82         mh.message_type = mt;
  83         mh.flags = (codec->data_endian == LittleEndian) ? forb_iop_LITTLE_ENDIAN : 0;
  84         mh.message_size = FORB_CDR_data_size(codec);
  85         ret = FORB_CDR_buffer_prepend(codec, forb_iop_MESSAGE_HEADER_SIZE);
  86         if (ret) {
  87                 ret = forb_iop_message_header_serialize(codec, &mh);
  88         }
  89         return ret;
  90 }
  91
  92 CORBA_boolean
  93 forb_iop_prepare_request(forb_request_t *req,
  94                          char *iface,
  95                          unsigned method_ind,
  96                          CORBA_Environment *env)
  97 {
  98         CORBA_boolean ret;
  99         forb_iop_request_header rh;
 100
 101         rh.request_id = req->request_id;
 102         rh.iface = iface;
 103         rh.objkey = forb_object_to_key(req->obj);
 104         rh.method_index = method_ind;
 105         rh.source = forb_object_to_forb(req->obj)->server_id;
 106         ret = forb_iop_request_header_serialize(&req->cdr_request, &rh);
 107         if (ret) {
 108                 /* Request body is 8 byte aligned */
 109                 ret = FORB_CDR_put_align(&req->cdr_request, 8);
 110                 char str[50];
 111                 ul_logdeb("preparing request: id=%d  dest=%s  iface=%s method=%d\n", req->request_id,
 112                           forb_server_id_to_string(str, &req->obj->server, sizeof(str)),
 113                           iface, method_ind);
 114         }
 115         return ret;
 116 }
 117
 118 static CORBA_boolean
 119 forb_iop_prepare_hello(FORB_CDR_Codec *codec,
 120                        const forb_server_id *server_id,
 121                        const void *src_addr,
 122                        CORBA_boolean (*serialize_addr)(FORB_CDR_Codec *codec, const void *addr),
 123                        const CORBA_char *orb_id)
 124 {
 125         if (!forb_server_id_serialize(codec, server_id)) return CORBA_FALSE;
 126         if (serialize_addr) {
 127                 if (!serialize_addr(codec, src_addr)) return CORBA_FALSE;
 128         }
 129         if (!CORBA_string_serialize(codec, &orb_id)) return CORBA_FALSE;
 130         if (!forb_iop_prepend_message_header(codec, forb_iop_HELLO)) return CORBA_FALSE;
 131         return CORBA_TRUE;
 132 }
 133
 134 int forb_iop_send_hello_to(forb_peer_t *peer)
 135 {
 136         forb_port_t *port = peer->port;
 137         FORB_CDR_Codec codec;
 138         int ret;
 139         FORB_CDR_codec_init_static(&codec, port->forb->orb);
 140         if (!FORB_CDR_buffer_init(&codec, 1024, 0))
 141                 return -1;
 142         if (!FORB_CDR_buffer_reset(&codec, forb_iop_MESSAGE_HEADER_SIZE)) {
 143                 ret = -1;
 144                 goto free;
 145         }
 146         if (!forb_iop_prepare_hello(&codec, &port->forb->server_id,
 147                                     port->desc.addr,
 148                                     port->desc.proto->serialize_addr,
 149                                     port->forb->attr.orb_id)) {
 150                 ret = -1;
 151                 goto free;
 152         }
 153         ret = forb_proto_send(peer, &codec);
 154         if (ret > 0) ret = 0;
 155 free:
 156         FORB_CDR_codec_release_buffer(&codec);
 157         return ret;
 158 }
 159
 160 bool
 161 forb_iop_process_message_header(forb_iop_message_header *mh, FORB_CDR_Codec *codec)
 162 {
 163         /* FIXME: If we have multiple protocol versions, use different
 164          * type (independent from version) for return value instead of
 165          * mh */
 166         forb_iop_version_deserialize(codec, &mh->proto_version);
 167         switch (VER(mh->proto_version.major, mh->proto_version.minor)) {
 168                 case VER(VER_MAJOR, VER_MINOR):
 169                         forb_iop_message_type_deserialize(codec, &mh->message_type);
 170                         forb_iop_message_flags_deserialize(codec, &mh->flags);
 171                         /* Check whwther the type is meaningfull */
 172                         switch (mh->message_type) {
 173                                 case forb_iop_REQUEST:
 174                                 case forb_iop_REPLY:
 175                                 case forb_iop_HELLO:
 176                                         break;
 177                                 default:
 178                                         ul_logerr("rcvd wrong message type: %d\n",
 179                                                   mh->message_type);
 180                                         return false;
 181                         }
 182                         codec->data_endian = (mh->flags && forb_iop_LITTLE_ENDIAN) ?
 183                                 LittleEndian : BigEndian;
 184                         CORBA_unsigned_long_deserialize(codec, &mh->message_size);
 185                         return true;
 186                         break;
 187                 default:
 188                         ul_logerr("rcvd wrong protocol versio: %d.%d\n",
 189                                   mh->proto_version.major, mh->proto_version.minor);
 190                         return false;
 191         }
 192 }
 193
 194 static inline CORBA_boolean
 195 forb_exception_serialize(FORB_CDR_Codec *codec, struct forb_env *env)
 196 {
 197         return CORBA_long_serialize(codec, &env->major);
 198 }
 199
 200 static inline CORBA_boolean
 201 forb_exception_deserialize(FORB_CDR_Codec *codec, struct forb_env *env)
 202 {
 203         /* TODO: Declare exceptions in IDL and don't typecast here. */
 204         return CORBA_long_deserialize(codec, (CORBA_long*)&env->major);
 205 }
 206
 207 void
 208 forb_iop_send_reply(forb_t *forb,
 209            forb_server_id *dest,
 210            FORB_CDR_Codec *codec,
 211            CORBA_long request_id,
 212            struct forb_env *env)
 213 {
 214         forb_iop_reply_header reply_header;
 215         CORBA_boolean ret;
 216         forb_peer_t *peer;
 217         fosa_abs_time_t timeout;
 218
 219         reply_header.request_id = request_id;
 220         reply_header.flags = 0;
 221         if (forb_exception_occurred(env)) {
 222                 reply_header.flags |= forb_iop_FLAG_EXCEPTION;
 223                 FORB_CDR_buffer_reset(codec, forb_iop_MESSAGE_HEADER_SIZE +
 224                                              forb_iop_REPLY_HEADER_SIZE);
 225                 forb_exception_serialize(codec, env);
 226         }
 227         /* forb_iop_REPLY_HEADER_SIZE equals to 8 even if the real
 228          * header is shorter. We want reply data to be 8 byte
 229          * aligned */
 230         ret = FORB_CDR_buffer_prepend(codec, forb_iop_REPLY_HEADER_SIZE);
 231         if (!ret) {
 232                 goto err;
 233         }
 234         ret = forb_iop_reply_header_serialize(codec, &reply_header);
 235         if (!ret) {
 236                 goto err;
 237         }
 238         forb_iop_prepend_message_header(codec, forb_iop_REPLY);
 239
 240         fosa_clock_get_time(FOSA_CLOCK_ABSOLUTE, &timeout);
 241         timeout = fosa_abs_time_incr(timeout,
 242                                      fosa_msec_to_rel_time(1000));
 243
 244         peer = forb_get_next_hop(forb, dest, &timeout);
 245         if (!peer) {
 246                 char str[60];
 247                 forb_server_id_to_string(str, dest, sizeof(str));
 248                 ul_logerr("Reply destination not found: %s\n", str);
 249                 goto err;
 250         } else {
 251                 char str[60];
 252                 forb_server_id_to_string(str, dest, sizeof(str));
 253                 ul_logdeb("sending reply: dest=%s, id=%u\n", str, request_id);
 254         }
 255         forb_proto_send(peer, codec);
 256         forb_peer_put(peer);
 257 err:
 258         ;
 259 }
 260
 261 static void
 262 process_request(forb_port_t *port, FORB_CDR_Codec *codec, uint32_t message_size)
 263 {
 264         forb_iop_request_header request_header;
 265         CORBA_boolean ret;
 266         forb_object obj;
 267         size_t n;
 268         forb_t *forb = port->forb;
 269         struct forb_env env;
 270         FORB_CDR_Codec reply_codec;
 271         forb_exec_req_t *exec_req;
 272         uint32_t req_size, data_size, header_size;
 273         char str[32];
 274         forb_peer_t *peer;
 275
 276         data_size = FORB_CDR_data_size(codec);
 277         ret = forb_iop_request_header_deserialize(codec, &request_header);
 278         if (!ret) {
 279                 ul_logerr("Malformed request recevied\n");
 280                 env.major = FORB_EX_COMM_FAILURE;
 281                 goto out;
 282         }
 283         ret = FORB_CDR_get_align(codec, 8);
 284         if (!ret) {
 285                 ul_logerr("Malformed request recevied\n");
 286                 env.major = FORB_EX_COMM_FAILURE;
 287                 goto out;
 288         }
 289
 290         header_size = data_size - FORB_CDR_data_size(codec);
 291         req_size = message_size - header_size;
 292
 293         ul_logdeb("rcvd request: src=%s, id=%u, iface=%s, method=%hd\n",
 294                   forb_server_id_to_string(str, &request_header.source, sizeof(str)),
 295                   request_header.request_id,
 296                   request_header.iface,
 297                   request_header.method_index);
 298
 299         if (port->new_peer) {
 300                 /* Request from a new peer was reported by the underlaying protocol */
 301                 peer = forb_peer_find(port->forb, &request_header.source);
 302                 if (peer) {
 303                         /* We already know this peer */
 304                         /* TODO: Can it be in FORB_PEER_WANTED state?
 305                          * If yes, we cannot simply igore this. */
 306                         ul_logmsg("new_peer was already known\n");
 307                         forb_peer_put(port->new_peer);
 308                         port->new_peer = NULL;
 309                 } else {
 310                         ul_logdeb("discovered new_peer from incomming connection\n");
 311                         peer = port->new_peer;
 312                         port->new_peer = NULL;
 313                         forb_new_peer_discovered(port, peer, request_header.source,
 314                                                  peer->addr, peer->orb_id);
 315                 }
 316
 317         }
 318
 319         obj = forb_key_to_object(forb, request_header.objkey);
 320         if (!obj) {
 321                 ul_logerr("Nonexistent object key\n");
 322                 env.major = FORB_EX_OBJECT_NOT_EXIST;
 323                 goto send_execption;
 324         }
 325
 326         n = strlen(request_header.iface);
 327         ret = strncmp(request_header.iface, obj->interface->name, n);
 328         forb_free(request_header.iface);
 329         request_header.iface = NULL;
 330         if (ret != 0) {
 331                 env.major = FORB_EX_INV_OBJREF;
 332                 ul_logerr("Object reference has incorrect type\n");
 333                 goto send_execption;
 334         }
 335
 336         if (request_header.method_index >= obj->interface->num_methods) {
 337                 env.major = FORB_EX_INV_IDENT;
 338                 ul_logerr("To high method number\n");
 339                 goto send_execption;
 340         }
 341
 342         if (!obj->executor) {
 343                 env.major = FORB_EX_NO_IMPLEMENT;
 344                 ul_logerr("No executor for object\n");
 345                 goto send_execption;
 346
 347         }
 348
 349         /* Enqueue execution request */
 350         exec_req = forb_malloc(sizeof(*exec_req));
 351         if (exec_req) {
 352                 memset(exec_req, 0, sizeof(exec_req));
 353                 exec_req->request_id = request_header.request_id;
 354                 exec_req->source = request_header.source;
 355                 exec_req->obj = obj;
 356                 exec_req->method_index = request_header.method_index;
 357                 /* Copy the request to exec_req */
 358                 FORB_CDR_codec_init_static(&exec_req->codec, codec->orb);
 359                 ret = FORB_CDR_buffer_init(&exec_req->codec,
 360                                       req_size,
 361                                       0);
 362                 if (!ret) {
 363                         env.major = FORB_EX_NO_MEMORY;
 364                         ul_logerr("No memory for executor request bufer of size %d (header_size=%d)\n",
 365                                   req_size, header_size);
 366                         goto send_execption;
 367                 }
 368                 exec_req->codec.data_endian = codec->data_endian;
 369                 FORB_CDR_buffer_gets(codec, exec_req->codec.buffer, req_size);
 370                 /* TODO: Use better data structure for incomming
 371                    buffer to achieve zero-copy behaviour. */
 372                 forb_exec_req_ins_tail(obj->executor, exec_req);
 373         } else {
 374                 env.major = FORB_EX_NO_MEMORY;
 375                 ul_logerr("No memory for executor request\n");
 376                 goto send_execption;
 377         }
 378
 379 out:
 380         return;
 381
 382 send_execption:
 383         FORB_CDR_codec_init_static(&reply_codec, codec->orb);
 384         ret = FORB_CDR_buffer_init(&reply_codec, 4096,
 385                               forb_iop_MESSAGE_HEADER_SIZE +
 386                               forb_iop_REPLY_HEADER_SIZE);
 387         if (!ret) {
 388                 ul_logerr("No memory for exception reply buffer\n");
 389                 return;
 390         }
 391
 392         forb_iop_send_reply(port->forb, &request_header.source,
 393                             &reply_codec, request_header.request_id, &env);
 394         FORB_CDR_codec_release_buffer(&reply_codec);
 395         /* TODO: relese exec_req etc. */
 396 }
 397
 398 static void
 399 process_reply(forb_port_t *port, FORB_CDR_Codec *codec)
 400 {
 401         forb_iop_reply_header rh;
 402         forb_t *forb = port->forb;
 403         forb_request_t *req;
 404
 405         forb_iop_reply_header_deserialize(codec, &rh);
 406         /* Reply data are 8 byte aligned */
 407         FORB_CDR_get_align(codec, 8);
 408         ul_logdeb("rcvd reply: id=%u\n", rh.request_id);
 409         req = forb_request_find(forb, &rh.request_id);
 410         if (!req) {
 411                 ul_logerr("Received reply to unknown request_id %u\n", rh.request_id);
 412                 return;
 413         }
 414         forb_request_delete(forb, req); /* Deregister request from forb */
 415
 416         if (rh.flags & forb_iop_FLAG_EXCEPTION) {
 417                 forb_exception_deserialize(codec, req->env);
 418         } else {
 419                 req->cdr_reply = codec;
 420         }
 421
 422         /* Tell the stub where to signal that reply processing is
 423          * finished */
 424         req->reply_processed = &port->reply_processed;
 425
 426         /* Resume the stub waiting in forb_wait_for_reply() */
 427         forb_syncobj_signal(&req->reply_ready);
 428
 429         /* Wait for stub to process the results from the codec's buffer */
 430         forb_syncobj_wait(&port->reply_processed);
 431 }
 432
 433 /**
 434  * Process incomming HELLO messages.
 435  *
 436  * For every incomming HELLO message the peer table is searched
 437  * whether it already contains a record for that peer or not. If not,
 438  * the new peer is added to the table and another hello message is
 439  * sent so that the new peer discovers us quickly.
 440  *
 441  * @param port Port, where hello was received
 442  * @param codec Buffer with the hello message
 443  */
 444 static void
 445 process_hello(forb_port_t *port, FORB_CDR_Codec *codec)
 446 {
 447         forb_server_id server_id;
 448         void *addr = NULL;
 449         forb_peer_t *peer;
 450         forb_t *forb = port->forb;
 451         CORBA_string peer_orb_id = NULL;
 452
 453 /*      printf("Hello received at port %p\n", port); */
 454
 455         forb_server_id_deserialize(codec, &server_id);
 456         if (port->desc.proto->deserialize_addr) {
 457                 port->desc.proto->deserialize_addr(codec, &addr);
 458         }
 459         {
 460                 char str[60], addrstr[60];
 461                 if (port->desc.proto->addr2str) {
 462                         port->desc.proto->addr2str(addrstr, sizeof(addrstr), addr);
 463                 } else
 464                         addrstr[0] = 0;
 465                 ul_logdeb("rcvd hello from %s (addr %s)\n",
 466                           forb_server_id_to_string(str, &server_id, sizeof(str)),
 467                           addrstr);
 468         }
 469         CORBA_string_deserialize(codec, &peer_orb_id);
 470         if (forb_server_id_cmp(&server_id, &forb->server_id) != 0) {
 471                 peer = forb_peer_find(forb, &server_id);
 472                 if (peer && peer->state == FORB_PEER_DISCOVERED) {
 473                         /* TODO: Update last hello receive time */
 474                         if (addr)
 475                                 forb_free(addr);
 476                         if (peer_orb_id)
 477                                 forb_free(peer_orb_id);
 478                         forb_peer_put(peer);
 479                 } else {
 480                         if (port->new_peer) {
 481                                 if (peer)
 482                                         ul_logerr("Unahandled case - FORB_PEER_WANTED && port->new_peer\n");
 483                                 peer = port->new_peer;
 484                                 port->new_peer = NULL;
 485                         }
 486
 487                         forb_new_peer_discovered(port, peer, server_id, addr, peer_orb_id);
 488                 }
 489         }
 490 }
 491
 492 static void
 493 process_message(forb_port_t *port, const forb_iop_message_header *mh,
 494                 FORB_CDR_Codec *codec)
 495 {
 496         CORBA_long data_size = FORB_CDR_data_size(codec);
 497         /* TODO: Check destination address, whether the message is for
 498          * us or should be routed. */
 499
 500         /* TODO: If there is some processing error, skip the rest of
 501          * the message according mh.message_size. */
 502         switch (mh->message_type) {
 503                 case forb_iop_REQUEST:
 504                         process_request(port, codec, mh->message_size);
 505                         break;
 506                 case forb_iop_REPLY:
 507                         process_reply(port, codec);
 508                         break;
 509                 case forb_iop_HELLO:
 510                         process_hello(port, codec);
 511                         break;
 512                 default:
 513                         ul_logmsg("rcvd unknown message type\n");
 514                         break;
 515         }
 516         if (port->new_peer) {
 517                 /* If for some reaseon the new_peer was not processed so free it here. */
 518                 ul_logmsg("Forgotten new_peer\n");
 519                 forb_peer_put(port->new_peer);
 520                 port->new_peer = NULL;
 521         }
 522         if (FORB_CDR_data_size(codec) != data_size - mh->message_size) {
 523                 size_t processed = data_size - FORB_CDR_data_size(codec);
 524                 ul_logmsg("Message of type %d handled incorrectly (size=%d, processed=%d); fixing\n",
 525                           mh->message_type, mh->message_size, processed);
 526                 ;
 527                 codec->rptr += mh->message_size - processed;
 528         }
 529 }
 530
 531 /**
 532  * Thread run for every port to receive FORB messages from that port.
 533  *
 534  * @param arg Pointer to ::forb_port_t typecasted to void *.
 535  *
 536  * @return Always NULL
 537  */
 538 void *forb_iop_receiver_thread(void *arg)
 539 {
 540         forb_port_t *port = arg;
 541         const forb_proto_t *proto = port->desc.proto;
 542         FORB_CDR_Codec *c = &port->codec;
 543         ssize_t rcvd;
 544         size_t len;
 545         forb_iop_message_header mh;
 546         bool header_received = false;
 547
 548         while (!port->finish) {
 549                 if (c->rptr == c->wptr) {
 550                         /* The buffer is empty now - start writing from begining*/
 551                         FORB_CDR_buffer_reset(c, 0);
 552                 }
 553                 /* TODO: If there is not enough space for reception,
 554                  * we should shift the already received data to the
 555                  * beginning of the buffer. */
 556                 rcvd = proto->recv(port,
 557                                    &c->buffer[c->wptr],
 558                                    c->wptr_max - c->wptr);
 559                 if (rcvd < 0) {
 560                         ul_logerr("recv returned error %d (%s), exiting\n", rcvd, strerror(errno));
 561                         return NULL;
 562                 }
 563                 c->wptr += rcvd;
 564                 c->wptr_last = c->wptr;
 565
 566                 /* While there are some data in the buffer, process them. */
 567                 while (FORB_CDR_data_size(c) > 0) {
 568                         len = FORB_CDR_data_size(c);
 569                         /* Wait for and then process message header */
 570                         if (!header_received) {
 571                                 if (len >= forb_iop_MESSAGE_HEADER_SIZE) {
 572                                         if (c->rptr % 8 != 0) {
 573                                                 ul_logerr("Header doesn't start at 8 byte bounday\n");
 574                                         }
 575                                         header_received = forb_iop_process_message_header(&mh, c);
 576                                         if (!header_received) {
 577                                                 ul_logerr("Wrong header received\n");
 578                                                 /* TODO: We should probably reset the buffer here */
 579                                         }
 580                                         len = FORB_CDR_data_size(c);
 581                                 } else {
 582                                         break; /* Wait for more data to arrive*/
 583                                 }
 584                         }
 585
 586                         /* Wait for and then process the message body */
 587                         if (header_received) {
 588                                 if (len >= mh.message_size) {
 589                                         process_message(port, &mh, c);
 590                                         /* Wait for the next message */
 591                                         header_received = false;
 592                                 } else {
 593                                         break; /* Wait for more data to arrive*/
 594                                 }
 595                         }
 596                 }
 597         }
 598         return NULL;
 599 }
 600
 601 static void
 602 discovery_cleanup(void *codec)
 603 {
 604         FORB_CDR_codec_release_buffer((FORB_CDR_Codec*)codec);
 605         /* TODO: Broadcast some kind of bye bye message */
 606 }
 607
 608
 609 /**
 610  * Thread run for every port to broadcast HELLO messages. These
 611  * messages are used for a FORB to discover all peers (and in future
 612  * also to detect their disconnection).
 613  *
 614  * @param arg Pointer to ::forb_port_t typecasted to void *.
 615  *
 616  * @return Always NULL
 617  */
 618 void *forb_iop_discovery_thread(void *arg)
 619 {
 620         forb_port_t *port = arg;
 621         const forb_proto_t *proto = port->desc.proto;
 622         FORB_CDR_Codec codec;
 623         fosa_abs_time_t hello_time;
 624         fosa_rel_time_t hello_interval = fosa_msec_to_rel_time(1000*proto->hello_interval);
 625         int ret;
 626
 627         FORB_CDR_codec_init_static(&codec, port->forb->orb);
 628         FORB_CDR_buffer_init(&codec, 1024, 0);
 629
 630         pthread_cleanup_push(discovery_cleanup, &codec);
 631
 632         /* Next hello interval is now */
 633         fosa_clock_get_time(FOSA_CLOCK_ABSOLUTE, &hello_time);
 634
 635         while (!port->finish) {
 636                 /* Wait for next hello interval or until somebody
 637                  * signals us. */
 638                 ret = forb_syncobj_timedwait(&port->hello, &hello_time);
 639                 /* sem_timedwait would be more appropriate */
 640                 if (ret == FOSA_ETIMEDOUT) {
 641                         hello_time = fosa_abs_time_incr(hello_time, hello_interval);
 642                 } else if (ret != 0) {
 643                         ul_logerr("hello syncobj error: %s\n", strerror(ret));
 644                 }
 645
 646                 if (port->finish) break;
 647
 648                 FORB_CDR_buffer_reset(&codec, forb_iop_MESSAGE_HEADER_SIZE);
 649                 forb_iop_prepare_hello(&codec, &port->forb->server_id, port->desc.addr,
 650                                        proto->serialize_addr, port->forb->attr.orb_id);
 651 /*              printf("Broadcasting hello from port %p\n", port);  */
 652                 proto->broadcast(port, &codec.buffer[codec.rptr],
 653                                  FORB_CDR_data_size(&codec));
 654         }
 655
 656         pthread_cleanup_pop(1);
 657         return NULL;
 658 }
 659
 660 /**
 661  * Sends REQUEST message to another FORB.
 662  *
 663  * The request @a req has to be prepared by
 664  * forb_iop_prepare_request(). Then, this function adds a message
 665  * header, connects to the destination FORB and sends the request.
 666  *
 667  * If no exception is reported, then the caller must wait for response
 668  * by calling forb_wait_for_reply().
 669  *
 670  * @param req A request prepared by forb_iop_prepare_request()
 671  * @param env Environment for returning exceptions
 672  */
 673 void
 674 forb_request_send(forb_request_t *req, CORBA_Environment *env)
 675 {
 676         CORBA_boolean ret;
 677         forb_peer_t *peer;
 678         ssize_t size;
 679         size_t len;
 680         fosa_abs_time_t timeout;
 681         forb_t *forb = forb_object_to_forb(req->obj);
 682
 683         if (!forb) {
 684                 env->major = FORB_EX_INTERNAL;
 685                 return;
 686         }
 687
 688         req->env = env;     /* Remember, where to return exceptions */
 689
 690         ret = forb_iop_prepend_message_header(&req->cdr_request, forb_iop_REQUEST);
 691         if (!ret) {
 692                 /* This should never happen */
 693                 env->major = FORB_EX_INTERNAL;
 694                 return;
 695         }
 696
 697         fosa_clock_get_time(FOSA_CLOCK_ABSOLUTE, &timeout);
 698         timeout = fosa_abs_time_incr(timeout,
 699                                      fosa_msec_to_rel_time(1000));
 700         peer = forb_get_next_hop(forb, &req->obj->server, &timeout);
 701         if (!peer) {
 702                 char str[50];
 703                 ul_logerr("Cannot find peer to send request for server %s\n",
 704                           forb_server_id_to_string(str, &req->obj->server, sizeof(str)));
 705                 env->major = FORB_EX_COMM_FAILURE;
 706                 return;
 707         }
 708         /* Register the request with forb so we can match incomming
 709          * reply to this request. */
 710         ret = forb_request_insert(forb, req);
 711         if (ret <= 0) {
 712                 ul_logerr("Insert request error %d\n", ret);
 713                 env->major = FORB_EX_INTERNAL;
 714                 goto err_peer_put;
 715         }
 716
 717         {
 718                 char str[50];
 719                 ul_logdeb("sending request: id=%d  dest=%s\n", req->request_id,
 720                           forb_server_id_to_string(str, &req->obj->server, sizeof(str)));
 721         }
 722         len = FORB_CDR_data_size(&req->cdr_request);
 723         fosa_mutex_lock(&peer->send_lock);
 724         size = forb_proto_send(peer, &req->cdr_request);
 725         fosa_mutex_unlock(&peer->send_lock);
 726         if (size <= 0 || size != len) {
 727                 env->major = FORB_EX_COMM_FAILURE;
 728                 /* Request is deleted when the stub calls forb_request_destroy() */
 729         }
 730  err_peer_put:
 731         forb_peer_put(peer);
 732 }