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