fres/cbroker/fcb.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 FRSH (FRescor ScHeduler)                         */
  26 /*                                                                        */
  27 /* FRSH 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.  FRSH 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 FRSH; 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 FRSH header files in a file,         */
  39 /* instantiating FRSH generics or templates, or linking other files       */
  40 /* with FRSH 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   fcb.c
  49  * @author Michal Sojka <sojkam1@fel.cvut.cz>
  50  * @date   Mon Oct 20 18:00:18 2008
  51  *
  52  * @brief  FRESCOR Contract Broker
  53  *
  54  *
  55  */
  56 #include <getopt.h>
  57 #include <forb.h>
  58 #include <forb/config.h>
  59 #include <fcb.h>
  60 #include <error.h>
  61 #include <errno.h>
  62 #include <stdio.h>
  63 #include <ul_gavlcust.h>
  64 #include <string.h>
  65 #include <ul_log.h>
  66 #include <ul_logreg.h>
  67 #include <forb/server_id.h>
  68 #include <fres_contract.h>
  69 #include "fcb_config.h"
  70 #include <fosa_clocks_and_timers.h>
  71 #if CONFIG_FCB_INET && !CONFIG_FORB_PROTO_INET_DEFAULT
  72 #include <forb/proto_inet.h>
  73 #endif
  74
  75 UL_LOG_CUST(ulogd_fcb);
  76 ul_log_domain_t ulogd_fcb = {UL_LOGL_MSG, "fcb"};
  77
  78 fosa_abs_time_t start_time;
  79
  80
  81 /**
  82  * Resource identification
  83  */
  84 struct res_key {
  85         frsh_resource_type_t type;
  86         frsh_resource_id_t id;
  87 };
  88
  89 /**
  90  * Registered resource
  91  */
  92 struct resource {
  93         gavl_node_t node;
  94         struct res_key key;
  95         char *name;
  96         fres_resource_manager mng; /**< Object reference of the resource manager */
  97         gavl_cust_root_field_t allocators; /**< Registered allocators for this resource (from multiple applications/nodes) */
  98         ul_list_head_t sc_contracts; /**< Negotiated contracts with spare capacity for this resource */
  99 };
 100
 101 /**
 102  * Resource allocator registered in different nodes/applications
 103  */
 104 struct res_alloc {
 105         gavl_node_t node;
 106         forb_server_id app;
 107         fres_resource_allocator ra;
 108 };
 109
 110 struct fcb_contract {
 111         fres_contract_id_t id;
 112         struct res_alloc *ra;   /**< Allocator for this contract TODO: Remove contract if allocator is destroyed */
 113         gavl_node_t node_fcb;
 114         ul_list_node_t node_sc;
 115         ul_list_node_t node_reservation;
 116         struct {
 117                 int initial;
 118                 int try;
 119         } sc_variant;
 120         fosa_abs_time_t end_of_stability_period;
 121         struct fres_contract *user_contract; /* The contract sent by user. Set after sucessfull neotiation. */
 122         struct fres_contract *requested_contract; /* User request for the contract. Set by prepare_reservation_requests() in the beginning of negotiation. */
 123         struct fres_contract *to_be_reserved_contract;
 124         struct fres_contract *schedulable_contract;
 125 };
 126
 127 /**
 128  * Contract broker data
 129  */
 130 struct fcb {
 131         gavl_cust_root_field_t resources; /**< Registered resources */
 132         gavl_cust_root_field_t contracts; /**< Contracts negotiated by this FCB */
 133 };
 134
 135 /** List of contracts to be reserved during spare capacity rebalancing */
 136 struct reservation_list {
 137         ul_list_head_t fcb_contracts;
 138         unsigned length;
 139 };
 140
 141 struct fcb_contract *fcb_contract_new(fres_contract_id_t *id)
 142 {
 143         struct fcb_contract *fcb_contract;
 144
 145         fcb_contract = malloc(sizeof(*fcb_contract));
 146         if (!fcb_contract) {
 147                 return NULL;
 148         }
 149         memset(fcb_contract, 0, sizeof(*fcb_contract));
 150         fcb_contract->id = *id;
 151
 152         return fcb_contract;
 153 }
 154
 155 void fcb_contract_destroy(struct fcb_contract *fcb_contract)
 156 {
 157         if (fcb_contract->user_contract) {
 158                 fres_contract_destroy(fcb_contract->user_contract);
 159         }
 160         if (fcb_contract->to_be_reserved_contract) {
 161                 fres_contract_destroy(fcb_contract->to_be_reserved_contract);
 162         }
 163         if (fcb_contract->requested_contract) {
 164                 fres_contract_destroy(fcb_contract->requested_contract);
 165         }
 166         if (fcb_contract->schedulable_contract) {
 167                 fres_contract_destroy(fcb_contract->requested_contract);
 168         }
 169         free(fcb_contract);
 170 }
 171
 172 static inline int res_key_cmp(const struct res_key *a,
 173                               const struct res_key *b)
 174 {
 175         if (a->type < b->type) {
 176                 return -1;
 177         } else if (a->type > b->type) {
 178                 return +1;
 179         } else if (a->id < b->id) {
 180                 return -1;
 181         } else if (a->id > b->id) {
 182                 return +1;
 183         } else {
 184                 return 0;
 185         }
 186 }
 187
 188 /* Container for registered resources */
 189 GAVL_CUST_NODE_INT_DEC(fcb_resource   /* cust_prefix */,                \
 190                        struct fcb     /* cust_root_t */,                \
 191                        struct resource/* cust_item_t */,                \
 192                        struct res_key /* cust_key_t */,                 \
 193                        resources      /* cust_root_node */,             \
 194                        node           /* cust_item_node */,             \
 195                        key            /* cust_item_key */,              \
 196                        res_key_cmp    /* cust_cmp_fnc */);
 197
 198 GAVL_CUST_NODE_INT_IMP(fcb_resource   /* cust_prefix */,                \
 199                        struct fcb     /* cust_root_t */,                \
 200                        struct resource/* cust_item_t */,                \
 201                        struct res_key /* cust_key_t */,                 \
 202                        resources      /* cust_root_node */,             \
 203                        node           /* cust_item_node */,             \
 204                        key            /* cust_item_key */,              \
 205                        res_key_cmp    /* cust_cmp_fnc */);
 206
 207 /* Container for allocators registered for a given resource */
 208 GAVL_CUST_NODE_INT_DEC(fcb_alloc        /* cust_prefix */,              \
 209                        struct resource  /* cust_root_t */,              \
 210                        struct res_alloc /* cust_item_t */,              \
 211                        forb_server_id   /* cust_key_t */,               \
 212                        allocators       /* cust_root_node */,           \
 213                        node             /* cust_item_node */,           \
 214                        app              /* cust_item_key */,            \
 215                        fres_contract_id_cmp /* cust_cmp_fnc */);
 216
 217 GAVL_CUST_NODE_INT_IMP(fcb_alloc        /* cust_prefix */,              \
 218                        struct resource   /* cust_root_t */,             \
 219                        struct res_alloc /* cust_item_t */,              \
 220                        forb_server_id   /* cust_key_t */,               \
 221                        allocators       /* cust_root_node */,           \
 222                        node             /* cust_item_node */,           \
 223                        app              /* cust_item_key */,            \
 224                        forb_server_id_cmp /* cust_cmp_fnc */);
 225
 226 /* Container for contracts with spare capacity negotiated for a given resource */
 227 UL_LIST_CUST_DEC(sc_contracts        /* cust_prefix */,                 \
 228                  struct resource  /* cust_head_t */,                    \
 229                  struct fcb_contract /* cust_item_t */,                 \
 230                  sc_contracts   /* cust_head_field */,                  \
 231                  node_sc        /* cust_node_field */);
 232
 233 UL_LIST_CUST_DEC(reservation_list        /* cust_prefix */,             \
 234                  struct reservation_list  /* cust_head_t */,            \
 235                  struct fcb_contract /* cust_item_t */,                 \
 236                  fcb_contracts  /* cust_head_field */,                  \
 237                  node_reservation /* cust_node_field */);
 238
 239 /* Container for negotiated contracts */
 240 GAVL_CUST_NODE_INT_DEC(fcb_contract         /* cust_prefix */,          \
 241                        struct fcb           /* cust_root_t */,          \
 242                        struct fcb_contract  /* cust_item_t */,          \
 243                        fres_contract_id_t   /* cust_key_t */,           \
 244                        contracts            /* cust_root_node */,       \
 245                        node_fcb             /* cust_item_node */,       \
 246                        id                   /* cust_item_key */,        \
 247                        fres_contract_id_cmp /* cust_cmp_fnc */);
 248
 249 #if 1
 250 GAVL_CUST_NODE_INT_IMP(fcb_contract         /* cust_prefix */,          \
 251                        struct fcb           /* cust_root_t */,          \
 252                        struct fcb_contract  /* cust_item_t */,          \
 253                        fres_contract_id_t   /* cust_key_t */,           \
 254                        contracts            /* cust_root_node */,       \
 255                        node_fcb             /* cust_item_node */,       \
 256                        id                   /* cust_item_key */,        \
 257                        fres_contract_id_cmp /* cust_cmp_fnc */);
 258 #else
 259 #include "fcb_contract_gavl.inc"
 260 #endif
 261
 262
 263 #define o2fcb(o) (struct fcb*)forb_instance_data(o)
 264
 265 struct res_key*
 266 get_res_key(const struct fres_contract *contract, struct res_key *key)
 267 {
 268         fres_block_resource *block_res;
 269
 270         block_res = fres_contract_get_resource(contract);
 271         if (!block_res) {
 272                 ul_logerr("No resource specified\n");
 273                 return NULL;
 274         } else {
 275                 key->type = block_res->resource_type;
 276                 key->id = block_res->resource_id;
 277         }
 278         return key;
 279 }
 280
 281 /**
 282  * Fills in an array of fcb_contracts according to requests submited
 283  * to negotiate_contracts(). For every contract in @a contracts, there
 284  * is one fcb_contract in @a fcb_contracts array.
 285  *
 286  * @param fcb
 287  * @param fcb_contracts Where to store pointers to fcb_contracts
 288  * @param resource Resource for which negotiation is being done.
 289  * @param app Application which requests negotiation
 290  * @param contracts Contracts submited to negotiate_contracts()
 291  * @param num Number of contracts in contracts (which is the same as the number in fcb_contracts).
 292  *
 293  * @return Zero on success, non-zero error code on error.
 294  */
 295 static int
 296 prepare_fcb_contracts(struct fcb *fcb, struct fcb_contract *fcb_contracts[],
 297                       struct resource **resource,
 298                       forb_server_id *app,
 299                       struct fres_contract *contracts[], int num)
 300 {
 301         unsigned i;
 302         struct fcb_contract *fc;
 303         struct res_alloc *ra;
 304         struct res_key key, key2 = {-1,-1};
 305
 306         for (i=0; i<num; i++) {
 307                 struct fres_contract *c = contracts[i];
 308
 309                 if (fres_contract_id_is_empty(&c->id)) {
 310                         /* Normal negotiation request */
 311                         forb_uuid_generate((forb_uuid_t *)&c->id);
 312                         fc = fcb_contract_new(&c->id);
 313                         if (!fc)
 314                                 return errno;
 315                         fcb_contracts[i] = fc;
 316                         if (!get_res_key(c, &key)) {
 317                                 return FRSH_ERR_RESOURCE_ID_INVALID;
 318                         }
 319                 } else {
 320                         fc = fcb_contract_find(fcb, &c->id);
 321                         if (!fc) {
 322                                 char str[60];
 323                                 fres_contract_id_to_string(str, &c->id, sizeof(str));
 324                                 ul_logerr("Attempt to change unknown contract %s\n", str);
 325                                 return FRES_ERR_NOTHING_TO_RENEGOTIATE;
 326                         } else {
 327                                 fcb_contracts[i] = fc;
 328                                 if (fres_contract_get_num_blocks(c) == 0) {
 329                                         /* Cancelation */
 330                                         get_res_key(fc->user_contract, &key);
 331                                 } else {
 332                                         /* Renegotiation */
 333                                         if (!get_res_key(c, &key)) {
 334                                                 return FRSH_ERR_RESOURCE_ID_INVALID;
 335                                         }
 336                                 }
 337                         }
 338                 }
 339                 fc->requested_contract = c;
 340
 341                 /* Check that all contracts are for the same resource */
 342                 if (i==0) {
 343                         key2 = key;
 344                         *resource = fcb_resource_find(fcb, &key);
 345                         if (!*resource) {
 346                                 ul_logerr("No resource manager for %d.%d registered\n",
 347                                           key.type, key.id);
 348                                 return FRSH_ERR_RESOURCE_ID_INVALID;
 349                         }
 350                 }
 351                 else if (key.type != key2.type ||
 352                          key.id   != key2.id) {
 353                         ul_logerr("Contract #%d differs in resource!\n", i);
 354                         return FRSH_ERR_RESOURCE_ID_INVALID;
 355                 }
 356
 357                 /* Find allocator for this request */
 358                 ra = fcb_alloc_find(*resource, app);
 359                 if (!ra) {
 360                         char str[60];
 361                         forb_server_id_to_string(str, app, sizeof(str));
 362                         ul_logerr("No resource allocator found for %d.%d and %s\n",
 363                                   (*resource)->key.type, (*resource)->key.id, str);
 364                         return FRES_ERR_NO_RESOURCE_ALLOCATOR;
 365                 }
 366                 fc->ra = ra;
 367         }
 368         return 0;
 369 }
 370
 371 /**
 372  * @param resource Resource for which to rebalance capacity and negotiate new contracts
 373  * @param fcb_contract New requests to negotiate
 374  * @param num The number of elements in @a fcb_contract
 375  * @param[out] rl List with changed contracts to be commited
 376  */
 377 static void
 378 prepare_reservation_list(struct resource *resource,
 379                          struct fcb_contract *fcb_contract[], int num,
 380                          struct reservation_list *rl)
 381 {
 382         int i;
 383         fosa_abs_time_t now;
 384         struct fcb_contract *fc;
 385
 386         reservation_list_init_head(rl);
 387         rl->length = 0;
 388         for (i=0; i<num; i++) {
 389                 assert(fcb_contract[i]->requested_contract != NULL);
 390                 reservation_list_insert(rl, fcb_contract[i]);
 391                 rl->length++;
 392         }
 393         fosa_clock_get_time(CLOCK_REALTIME, &now);
 394         ul_list_for_each(sc_contracts, resource, fc) {
 395                 if (fosa_abs_time_smaller(fc->end_of_stability_period, now) &&
 396                     fc->requested_contract == NULL) /* Do not insert contract inserted above */
 397                 {
 398                         reservation_list_insert(rl, fc);
 399                         rl->length++;
 400                 }
 401         }
 402 }
 403
 404 /**
 405  *
 406  *
 407  * @param resource Resource for which to rebalance capacity and negotiate new contracts
 408  * @param rl List with changed contracts to be commited
 409  *
 410  * @return Zero on success, non-zero error code on error
 411  */
 412 static int
 413 rebalance_spare_capacity_and_reserve(struct resource *resource,
 414                                      struct reservation_list *rl)
 415 {
 416         int ret;
 417         unsigned i;
 418         struct fcb_contract *fc;
 419         fres_block_spare_capacity *s;
 420
 421         fres_contract_ptr_seq contracts;
 422         if (!forb_sequence_alloc_buf(contracts, rl->length)) {
 423                 return errno;
 424         }
 425         contracts._length = rl->length;
 426         i=0;
 427         /* Initialize optimization */
 428         ul_list_for_each(reservation_list, rl, fc) {
 429                 fc->to_be_reserved_contract =
 430                         fc->requested_contract ? fres_contract_duplicate(fc->requested_contract) :
 431                         fc->user_contract ? fres_contract_duplicate(fc->user_contract) :
 432                         NULL;
 433                 assert(fc->to_be_reserved_contract != NULL);
 434
 435                 forb_sequence_elem(contracts, i) = fc->to_be_reserved_contract;
 436                 i++;
 437
 438                 s = fres_contract_get_spare_capacity(fc->to_be_reserved_contract);
 439                 if (s && s->granularity == FRSH_GR_DISCRETE) {
 440                         fc->sc_variant.initial = s->variants._length - 1;
 441                         fc->sc_variant.try = fc->sc_variant.initial;
 442                 }
 443         }
 444
 445         bool all_combinations_tried;
 446         int criterion, best_criterion = -1;
 447         struct fcb_contract *fcb_changed;
 448         /* Exhaustive search. Try all combinations of spare capacity
 449          * variants and find the one with best creterion. */
 450         do {
 451                 all_combinations_tried = true;
 452                 fcb_changed = NULL;
 453                 criterion = 0;
 454                 /* Prepare spare capacity variant */
 455                 ul_list_for_each(reservation_list, rl, fc) {
 456                         s = fres_contract_get_spare_capacity(fc->to_be_reserved_contract);
 457                         /* TODO: Simulate continuous granularity by discretization */
 458                         if (s && s->granularity == FRSH_GR_DISCRETE) {
 459                                 fres_container_copy(fc->to_be_reserved_contract->container,
 460                                                     forb_sequence_elem(s->variants, fc->sc_variant.try));
 461                                 criterion += fc->sc_variant.try;
 462
 463                                 if (fcb_changed == NULL) {
 464                                         /* Chnage tried variant for the next round */
 465                                         fc->sc_variant.try = fc->sc_variant.try > 0 ?
 466                                                 fc->sc_variant.try - 1 :
 467                                                 s->variants._length - 1;
 468                                         /* Do not change other
 469                                          * contracts unless we have
 470                                          * tried all variants */
 471                                         if (fc->sc_variant.try != fc->sc_variant.initial) {
 472                                                 fcb_changed = fc;
 473                                         }
 474                                 }
 475                                 if (fc->sc_variant.try != fc->sc_variant.initial)
 476                                         all_combinations_tried = false;
 477                         }
 478                 }
 479
 480                 if (criterion > best_criterion) {
 481                         CORBA_Environment ev;
 482                         /* Reserve contract */
 483                         ret = fres_resource_manager_reserve_contracts(resource->mng, &contracts, &ev);
 484                         if (forb_exception_occurred(&ev)) {
 485                                 ret = fres_forbex2err(&ev);
 486                                 ul_logerr("FORB exception when reserving contracts\n");
 487                                 goto err;
 488                         }
 489                         if (ret < 0) {
 490                                 ul_logerr("Contract reservation error %d\n", ret);
 491                                 ret = FRES_ERR_ADMISSION_TEST;
 492                                 goto err;
 493                         }
 494                         if (ret == 0) { /* negotiation succeeded */
 495                                 best_criterion = criterion;
 496                         }
 497                 }
 498         } while (!all_combinations_tried);
 499
 500         if (best_criterion == -1) {
 501                 ret = FRSH_ERR_CONTRACT_REJECTED;
 502         } else {
 503                 /* At least some variant succeeded */
 504                 ret = 0;
 505                 sc_contracts_init_head(resource);
 506                 ul_list_for_each(reservation_list, rl, fc) {
 507                         s = fres_contract_get_spare_capacity(fc->to_be_reserved_contract);
 508                         if (s && s->granularity == FRSH_GR_DISCRETE) {
 509                                 sc_contracts_insert(resource, fc);
 510                         }
 511                 }
 512         }
 513 err:
 514         ul_list_for_each(reservation_list, rl, fc) {
 515                 fres_contract_destroy(fc->to_be_reserved_contract);
 516                 fc->to_be_reserved_contract = NULL;
 517         }
 518         forb_sequence_free_buf(contracts, forb_no_destructor);
 519         return ret;
 520 }
 521
 522 /**
 523  * Create/change VReses according to @a schedulable_contracts.
 524  *
 525  * There might be more allocators for schedulable contracts, so merge
 526  * adjacent vreses with the same allocator together and create/change
 527  * them in one step. Also the order of schedulable contracts might be
 528  * different from the initial order od ids in commit_contracts()
 529  * therefore we have to search for every contract.
 530  */
 531 static int
 532 change_vreses(struct fcb *fcb, fres_contract_ptr_seq *schedulable_contracts)
 533 {
 534         struct res_alloc *last_ra = NULL;
 535         fres_contract_ptr_seq vreses;
 536         int i, ret;
 537         CORBA_Environment ev;
 538
 539         if (!forb_sequence_alloc_buf(vreses, schedulable_contracts->_length)) {
 540                 return errno;
 541         }
 542         vreses._length = 0;
 543
 544         for (i=0; i<schedulable_contracts->_length; i++) {
 545                 struct fcb_contract *fc;
 546                 struct fres_contract *sc = schedulable_contracts->_buffer[i];
 547
 548                 fc = fcb_contract_find(fcb, &sc->id);
 549                 assert(fc != NULL);
 550
 551                 if (true /* TODO: if the schedulable contract is changed */) {
 552                         if (last_ra != fc->ra) {
 553                                 if (vreses._length) {
 554                                         ret = fres_resource_allocator_change_vreses(last_ra->ra,
 555                                                                                     &vreses, &ev);
 556                                         if (forb_exception_occurred(&ev)) {
 557                                                 ret = fres_forbex2err(&ev);
 558                                                 goto err;
 559                                         }
 560                                         if (ret) goto err;
 561                                 }
 562                                 vreses._length = 0;
 563                         }
 564                         vreses._buffer[vreses._length] = sc;
 565                         vreses._length++;
 566                         fres_contract_destroy(fc->schedulable_contract);
 567                         fc->schedulable_contract = fres_contract_duplicate(sc);
 568                         last_ra = fc->ra;
 569
 570                 }
 571         }
 572         ret = fres_resource_allocator_change_vreses(last_ra->ra,
 573                                                     &vreses, &ev);
 574         if (forb_exception_occurred(&ev))
 575                 ret = fres_forbex2err(&ev);
 576 err:
 577         forb_sequence_free_buf(vreses, forb_no_destructor);
 578         return ret;
 579 }
 580
 581 CORBA_long
 582 negotiate_contracts(fres_contract_broker obj,
 583                     const fres_contract_ptr_seq* contracts,
 584                     fres_contract_id_seq** ids_out,
 585                     CORBA_Environment *ev)
 586 {
 587         struct fcb *fcb = o2fcb(obj);
 588         struct resource *resource = NULL;
 589         int ret = 0;
 590         forb_server_id app;
 591         fres_contract_ptr_seq *schedulable_contracts;
 592         struct fcb_contract **fcb_contracts, *fc;
 593         unsigned i;
 594         fres_contract_id_seq commit_ids;
 595
 596         /* Prepare output sequence for the case we return eariler with
 597          * an error */
 598         forb_sequence_alloc(*ids_out, 0);
 599         if (!*ids_out) {
 600                 ev->major = FORB_EX_NO_MEMORY;
 601                 goto err;
 602         }
 603         CORBA_sequence_set_release(*ids_out, CORBA_TRUE);
 604
 605         forb_get_req_source(obj, &app);
 606
 607         fcb_contracts = malloc(sizeof(fcb_contracts[0])*contracts->_length);
 608         if (!fcb_contracts) {
 609                 ret = errno;
 610                 goto err;
 611         }
 612         memset(fcb_contracts, 0, sizeof(fcb_contracts[0])*contracts->_length);
 613
 614         ret = prepare_fcb_contracts(fcb, fcb_contracts, &resource,
 615                                     &app, contracts->_buffer, contracts->_length);
 616         if (ret)
 617                 goto err_free_fcb_contracts;
 618
 619         struct reservation_list rl;
 620         prepare_reservation_list(resource,
 621                                  fcb_contracts, contracts->_length,
 622                                  &rl);
 623
 624         /* Allocate all the needed memory before doing reservation. If
 625          * there is no enough memory, it has no sense to call resource
 626          * manager. */
 627         if (!forb_sequence_alloc_buf(commit_ids, rl.length)) {
 628                 ret = errno;
 629                 goto err_free_fcb_contracts;
 630         }
 631
 632         /* Reserve contracts */
 633         ret = rebalance_spare_capacity_and_reserve(resource, &rl);
 634         if (ret) {
 635                 if (ret == FRSH_ERR_CONTRACT_REJECTED) {
 636                         ul_logmsg("Contract(s) was/were rejected\n");
 637                 } else {
 638                         char msg[100];
 639                         fres_strerror(ret, msg, sizeof(msg));
 640                         ul_logerr("Reservation error: %s\n", msg);
 641                 }
 642                 goto err_free_fcb_contracts;
 643         }
 644
 645         /* Commit contracts */
 646         commit_ids._length = rl.length;
 647         i=0;
 648         ul_list_for_each(reservation_list, &rl, fc) {
 649                 forb_sequence_elem(commit_ids, i) = fc->id;
 650                 i++;
 651         }
 652
 653         fres_resource_manager_commit_contracts(resource->mng, &commit_ids,
 654                                                &schedulable_contracts, ev);
 655         if (forb_exception_occurred(ev)) {
 656                 ret = fres_forbex2err(ev);
 657                 goto err_cancel_reservation;
 658         }
 659
 660         /* Add new contracts to our fcb database for later
 661          * reference. Canceled contracts are removed below. */
 662         for (i=0; i<contracts->_length; i++) {
 663                 fc =  fcb_contracts[i];
 664
 665                 if (fc->user_contract) {
 666                         if (fres_contract_get_num_blocks(fc->requested_contract) > 0) {
 667                                 /* Renegotiation */
 668                                 fres_contract_destroy(fc->user_contract);
 669                                 fc->user_contract = fres_contract_duplicate(fc->requested_contract);
 670                                 /* Note: requested_contract is also
 671                                  * pointed by contracts parameter and
 672                                  * will be freed by FORB. */
 673                                 fc->requested_contract = NULL;
 674                         }
 675                 } else {
 676                         /* Insert new contracts */
 677                         fcb_contract_insert(fcb, fcb_contracts[i]);
 678                         fc->user_contract = fres_contract_duplicate(fc->requested_contract);
 679                         fc->requested_contract = NULL;
 680                         /* See the note above. */
 681                 }
 682         }
 683
 684         ret = change_vreses(fcb, schedulable_contracts);
 685         if (ret)
 686                 goto err_cancel_reservation;
 687
 688         forb_sequence_free(schedulable_contracts, fres_contract_ptr_destroy);
 689         if (ret != 0) {
 690                 ul_logerr("VRes was not created\n");
 691                 goto err_cancel_contracts;
 692         }
 693
 694
 695         /* Return IDs and delete canceled contracts from out database */
 696         if (!forb_sequence_alloc_buf(**ids_out, contracts->_length)) {
 697                 ev->major = FORB_EX_NO_MEMORY;
 698                 goto err_cancel_contracts;
 699         }
 700         (*ids_out)->_length = contracts->_length;
 701         for (i=0; i<contracts->_length; i++) {
 702                 struct fcb_contract *fc =  fcb_contracts[i];
 703                 forb_sequence_elem(**ids_out, i) = fc->id;
 704
 705                 if (fc->requested_contract &&
 706                     fres_contract_get_num_blocks(fc->requested_contract) == 0) {
 707                         fcb_contract_delete(fcb, fc);
 708                         /* Note: requested_contract is also pointed by
 709                          * contracts parameter and will be freed by FORB. */
 710                         fc->requested_contract = NULL;
 711                         fcb_contract_destroy(fc);
 712                 }
 713         }
 714         return 0;
 715
 716 err_cancel_contracts:
 717         /* TODO */
 718         goto err_free_fcb_contracts;
 719 err_cancel_reservation:
 720         fres_resource_manager_cancel_reservations(resource->mng, &commit_ids, ev);
 721 err_free_fcb_contracts:
 722         for (i=0; i<contracts->_length; i++) {
 723                 fc = fcb_contracts[i];
 724                 if (fc && !fc->user_contract) {
 725                         fcb_contracts[i]->requested_contract = NULL; /* Destroyed by FORB */
 726                         fcb_contract_destroy(fcb_contracts[i]);
 727                 }
 728         }
 729         free(fcb_contracts);
 730 err:
 731         return ret;
 732 }
 733
 734 void redistribute_spare_capacity(fres_contract_broker obj,
 735                                  const frsh_resource_type_t restype,
 736                                  const frsh_resource_id_t resid,
 737                                  CORBA_Environment *ev)
 738 {
 739         struct fcb *fcb = o2fcb(obj);
 740         struct res_key key = {restype, resid };
 741         struct resource *resource;
 742         struct reservation_list rl;
 743
 744         resource = fcb_resource_find(fcb, &key);
 745
 746         prepare_reservation_list(resource, NULL, 0, &rl);
 747
 748 /*      forb_sequence_alloc(ids, rl.length); */
 749 /*      if (!ids || !ids->_buffer) { */
 750 /*              ev->major = FORB_EX_NO_MEMORY; */
 751 /*              goto err_free_fcb_contracts; */
 752 /*      } */
 753 /*      CORBA_sequence_set_release(ids, CORBA_TRUE); */
 754 /*      *ids_out = ids;         /\* ids is freed by FORB *\/ */
 755
 756
 757         rebalance_spare_capacity_and_reserve(resource, &rl);
 758         /* Commit */
 759 }
 760
 761 CORBA_long register_resource(fres_contract_broker obj,
 762                             const frsh_resource_type_t restype,
 763                             const frsh_resource_id_t resid,
 764                             const fres_resource_desc *desc,
 765                             CORBA_Environment *ev)
 766 {
 767         struct fcb *fcb = o2fcb(obj);
 768         struct resource *res, *res2;
 769
 770         res = malloc(sizeof(*res));
 771         if (!res) goto err;
 772         memset(res, 0, sizeof(*res));
 773         res->key.type = restype;
 774         res->key.id = resid;
 775         res2 = fcb_resource_find(fcb, &res->key);
 776         if (res2) {
 777                 if (forb_object_is_stale(res2->mng)) {
 778                         ul_logmsg("Removing stale manager for resource %d.%d\n",
 779                                   restype, resid);
 780                         forb_object_release(res2->mng);
 781                         fcb_resource_delete(fcb, res2);
 782                         /* TODO: Delete also all allocators associated
 783                          * with this stale resource manager. */
 784                         free(res);
 785                         res = res2;
 786                 } else {
 787                         ul_logerr("Resource manager %d.%d already registered\n",
 788                                   restype, resid);
 789                         goto free_err;
 790                 }
 791         }
 792         res->mng = forb_object_duplicate(desc->manager);
 793         res->name = desc->name;
 794
 795         fcb_alloc_init_root_field(res);
 796         sc_contracts_init_head(res);
 797         ul_logmsg("Registering manager for resource \"%s\" (%d.%d)\n",
 798                   res->name, restype, resid);
 799         fcb_resource_insert(fcb, res);
 800         return 0;
 801 free_err:
 802         free(res);
 803 err:
 804         return -1;
 805 }
 806
 807
 808 CORBA_long register_allocator(fres_contract_broker obj,
 809                               const frsh_resource_type_t restype,
 810                               const frsh_resource_id_t resid,
 811                               const fres_resource_allocator ra_obj,
 812                               CORBA_Environment *ev)
 813 {
 814         struct fcb *fcb = o2fcb(obj);
 815         struct resource *res;
 816         struct res_alloc *ra;
 817         struct res_key resource;
 818         forb_server_id server_id;
 819         char server_id_str[40];
 820
 821         forb_get_server_id(ra_obj, &server_id);
 822         forb_server_id_to_string(server_id_str, &server_id, sizeof(server_id_str));
 823         ul_logmsg("Registering allocator for resource %d.%d in app %s\n",
 824                   restype, resid, server_id_str);
 825
 826         resource.type = restype;
 827         resource.id = resid;
 828         res = fcb_resource_find(fcb, &resource);
 829         if (!res) {
 830                 ul_logerr("No manager found for %d.%d. Unable to register the allocator!\n",
 831                           restype, resid);
 832                 goto err;
 833         }
 834         ra = fcb_alloc_find(res, &server_id);
 835         if (ra) {
 836                 char *str = forb_object_to_string(ra_obj);
 837                 ul_logerr("Allocator from already registered (%s)\n",
 838                           str);
 839                 forb_free(str);
 840                 goto err;
 841         }
 842         ra = malloc(sizeof(*ra));
 843         if (!ra) {
 844                 goto err;
 845         }
 846         ra->app = server_id;
 847         ra->ra = forb_object_duplicate(ra_obj);
 848         fcb_alloc_insert(res, ra);
 849         return 0;
 850 err:
 851         return FRSH_ERR_RESOURCE_ID_INVALID;
 852 }
 853
 854 void get_resources(fres_contract_broker obj, fres_resource_seq** resources, CORBA_Environment *ev)
 855 {
 856         struct fcb *fcb = o2fcb(obj);
 857         fres_resource_seq *seq;
 858         struct resource *res;
 859         int n;
 860
 861         seq = malloc(sizeof(*seq));
 862         if (!seq) {
 863                 ev->major = FORB_EX_NO_MEMORY;
 864                 return;
 865         }
 866         memset(seq, 0, sizeof(*seq));
 867
 868         n=0;
 869         gavl_cust_for_each(fcb_resource, fcb, res) {
 870                 n++;
 871         }
 872
 873         seq->_buffer = CORBA_sequence_fres_resource_allocbuf(n);
 874         seq->_maximum = n;
 875         seq->_length = n;
 876
 877         n = 0;
 878         gavl_cust_for_each(fcb_resource, fcb, res) {
 879                 seq->_buffer[n].restype = res->key.type;
 880                 seq->_buffer[n].resid = res->key.id;
 881                 seq->_buffer[n].desc.manager = res->mng;
 882                 seq->_buffer[n].desc.name = res->name;
 883                 n++;
 884         }
 885
 886         *resources = seq;
 887 }
 888
 889 #if CONFIG_FCB_INET && !CONFIG_FORB_PROTO_INET_DEFAULT
 890 static int register_inet_port(forb_orb orb)
 891 {
 892         forb_port_t *port = forb_malloc(sizeof(*port));
 893         int ret;
 894         struct in_addr listen_on;
 895
 896         if (!port)
 897                 return -1;
 898         memset(port, 0, sizeof(*port));
 899         listen_on.s_addr = INADDR_ANY;
 900         ret = forb_inet_port_init(&port->desc, listen_on);
 901         if (ret)
 902                 return ret;
 903         ret = forb_register_port(orb, port);
 904         return ret;
 905 }
 906 #endif
 907
 908 struct forb_fres_contract_broker_impl impl = {
 909         .negotiate_contracts = negotiate_contracts,
 910         .register_resource = register_resource,
 911         .register_allocator = register_allocator,
 912         .redistribute_spare_capacity = redistribute_spare_capacity,
 913         .get_resources = get_resources,
 914 };
 915
 916 void peer_discovery_callback(const forb_orb peer_orb, const char *orb_id)
 917 {
 918         forb_server_id server_id;
 919         char server_id_str[sizeof(forb_server_id)*2+1];
 920
 921         forb_get_server_id(peer_orb, &server_id);
 922         forb_server_id_to_string(server_id_str, &server_id, sizeof(server_id_str));
 923 #if 0
 924         ul_logmsg("peer discovered: %s (orb_id '%s')\n", server_id_str, orb_id);
 925 #endif
 926
 927         if (orb_id == NULL)
 928                 return;
 929
 930         if (strcmp(orb_id, "org.frescor.fcb") == 0) {
 931                 fosa_abs_time_t now;
 932                 fosa_rel_time_t delay;
 933                 fosa_clock_get_time(CLOCK_REALTIME, &now);
 934                 delay = fosa_abs_time_extract_interval(start_time, now);
 935                 ul_logmsg("node joined: %s (time %ld ms)\n", server_id_str,
 936                           fosa_rel_time_to_msec(delay));
 937         }
 938 }
 939
 940 void peer_dead_callback(const forb_orb peer_orb, const char *orb_id)
 941 {
 942 }
 943
 944 static struct option long_opts[] = {
 945     { "loglevel", 1, 0, 'l' },
 946     { 0, 0, 0, 0}
 947 };
 948
 949 static void
 950 usage(void)
 951 {
 952         printf("usage: fcb [ options ]\n");
 953         printf("  -l, --loglevel <number>|<domain>=<number>,...\n");
 954 }
 955
 956 int main(int argc, char *argv[])
 957 {
 958         forb_orb orb;
 959         struct fcb fcb_data;
 960         fres_contract_broker fcb;
 961         forb_executor_t executor;
 962         int ret;
 963         forb_init_attr_t attr = {
 964                 .orb_id = "org.frescor.fcb",
 965                 .peer_discovery_callback = peer_discovery_callback,
 966                 .peer_dead_callback = peer_dead_callback,
 967         };
 968         int  opt;
 969
 970         ul_logreg_domain(&ulogd_fcb);
 971
 972         while ((opt = getopt_long(argc, argv, "l:", &long_opts[0], NULL)) != EOF) {
 973                 switch (opt) {
 974                         case 'l':
 975                                 ul_log_domain_arg2levels(optarg);
 976                                 break;
 977                         case 'h':
 978                         /*default:*/
 979                                 usage();
 980                                 exit(opt == 'h' ? 0 : 1);
 981                 }
 982         }
 983
 984         fosa_clock_get_time(CLOCK_REALTIME, &start_time);
 985
 986         orb = forb_init(&argc, &argv, &attr);
 987         if (!orb) error(1, errno, "FORB initialization failed");
 988
 989 #if CONFIG_FCB_INET && !CONFIG_FORB_PROTO_INET_DEFAULT
 990         ret = register_inet_port(orb);
 991         if (ret) error(0, errno, "INET port registration failed");
 992 #endif
 993
 994         fcb_resource_init_root_field(&fcb_data);
 995         fcb_contract_init_root_field(&fcb_data);
 996
 997         fcb = forb_fres_contract_broker_new(orb, &impl, &fcb_data);
 998         if (!fcb) error(1, errno, "forb_fres_contract_broker_new failed");
 999
1000         /* Prepare executor before we register the fcb reference,
1001          * so that no reuqests are lost */
1002         ret = forb_executor_init(&executor);
1003         if (ret) error(1, errno, "forb_executor_init failed");
1004
1005         ret = forb_executor_register_object(&executor, fcb);
1006         if (ret) error(1, errno, "forb_executor_register_object failed");
1007
1008         ret = forb_register_reference(fcb, fres_contract_broker_reg_name);
1009         if (ret) error(1, errno, "forb_register_reference() failed");
1010
1011         ul_logmsg("Waiting for requests\n");
1012         ret = forb_executor_run(&executor);
1013         if (ret) error(1, errno, "forb_executor_run failed");
1014
1015         return 0;
1016 }