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 /**
 368  * @param resource Resource for which to rebalance capacity and negotiate new contracts
 369  * @param fcb_contract New requests to negotiate
 370  * @param num The number of elements in @a fcb_contract
 371  * @param[out] rl List with changed contracts to be commited
 372  */
 373 static void
 374 prepare_reservation_list(struct resource *resource,
 375                          struct fcb_contract *fcb_contract[], int num,
 376                          struct reservation_list *rl)
 377 {
 378         int i;
 379         fosa_abs_time_t now;
 380         struct fcb_contract *fc;
 381
 382         reservation_list_init_head(rl);
 383         rl->length = 0;
 384         for (i=0; i<num; i++) {
 385                 assert(fcb_contract[i]->requested_contract != NULL);
 386                 reservation_list_insert(rl, fcb_contract[i]);
 387                 rl->length++;
 388         }
 389         fosa_clock_get_time(CLOCK_REALTIME, &now);
 390         ul_list_for_each(sc_contracts, resource, fc) {
 391                 if (fosa_abs_time_smaller(fc->end_of_stability_period, now) &&
 392                     fc->requested_contract == NULL) /* Do not insert contract inserted above */
 393                 {
 394                         reservation_list_insert(rl, fc);
 395                         rl->length++;
 396                 }
 397         }
 398 }
 399
 400 /**
 401  *
 402  *
 403  * @param resource Resource for which to rebalance capacity and negotiate new contracts
 404  * @param rl List with changed contracts to be commited
 405  *
 406  * @return Zero on success, non-zero error code on error
 407  */
 408 static int
 409 rebalance_spare_capacity_and_reserve(struct resource *resource,
 410                                      struct reservation_list *rl)
 411 {
 412         int ret;
 413         unsigned i;
 414         struct fcb_contract *fc;
 415         fres_block_spare_capacity *s;
 416
 417         fres_contract_ptr_seq contracts;
 418         forb_sequence_alloc_buf(contracts, rl->length);
 419         contracts._length = rl->length;
 420         i=0;
 421         /* Initialize optimization */
 422         ul_list_for_each(reservation_list, rl, fc) {
 423                 fc->to_be_reserved_contract =
 424                         fc->requested_contract ? fres_contract_duplicate(fc->requested_contract) :
 425                         fc->user_contract ? fres_contract_duplicate(fc->user_contract) :
 426                         NULL;
 427                 assert(fc->to_be_reserved_contract != NULL);
 428
 429                 forb_sequence_elem(contracts, i) = fc->to_be_reserved_contract;
 430                 i++;
 431
 432                 s = fres_contract_get_spare_capacity(fc->to_be_reserved_contract);
 433                 if (s && s->granularity == FRSH_GR_DISCRETE) {
 434                         fc->sc_variant.initial = s->variants._length - 1;
 435                         fc->sc_variant.try = fc->sc_variant.initial;
 436                 }
 437         }
 438
 439         bool all_combinations_tried;
 440         int criterion, best_criterion = -1;
 441         struct fcb_contract *fcb_changed;
 442         /* Exhaustive search. Try all combinations of spare capacity
 443          * variants and find the one with best creterion. */
 444         do {
 445                 all_combinations_tried = true;
 446                 fcb_changed = NULL;
 447                 criterion = 0;
 448                 /* Prepare spare capacity variant */
 449                 ul_list_for_each(reservation_list, rl, fc) {
 450                         s = fres_contract_get_spare_capacity(fc->to_be_reserved_contract);
 451                         /* TODO: Simulate continuous granularity by discretization */
 452                         if (s && s->granularity == FRSH_GR_DISCRETE) {
 453                                 fres_container_copy(fc->to_be_reserved_contract->container,
 454                                                     forb_sequence_elem(s->variants, fc->sc_variant.try));
 455                                 criterion += fc->sc_variant.try;
 456
 457                                 if (fcb_changed == NULL) {
 458                                         /* Chnage tried variant for the next round */
 459                                         fc->sc_variant.try = fc->sc_variant.try > 0 ?
 460                                                 fc->sc_variant.try - 1 :
 461                                                 s->variants._length - 1;
 462                                         /* Do not change other
 463                                          * contracts unless we have
 464                                          * tried all variants */
 465                                         if (fc->sc_variant.try != fc->sc_variant.initial) {
 466                                                 fcb_changed = fc;
 467                                         }
 468                                 }
 469                                 if (fc->sc_variant.try != fc->sc_variant.initial)
 470                                         all_combinations_tried = false;
 471                         }
 472                 }
 473
 474                 if (criterion > best_criterion) {
 475                         CORBA_Environment ev;
 476                         /* Reserve contract */
 477                         ret = fres_resource_manager_reserve_contracts(resource->mng, &contracts, &ev);
 478                         if (forb_exception_occurred(&ev)) {
 479                                 ret = fres_forbex2err(&ev);
 480                                 ul_logerr("FORB exception when reserving contracts\n");
 481                                 goto err;
 482                         }
 483                         if (ret < 0) {
 484                                 ul_logerr("Contract reservation error %d\n", ret);
 485                                 ret = FRES_ERR_ADMISSION_TEST;
 486                                 goto err;
 487                         }
 488                         if (ret == 0) { /* negotiation succeeded */
 489                                 best_criterion = criterion;
 490                         }
 491                 }
 492         } while (!all_combinations_tried);
 493
 494         if (best_criterion == -1) {
 495                 ret = FRSH_ERR_CONTRACT_REJECTED;
 496         } else {
 497                 /* At least some variant succeeded */
 498                 ret = 0;
 499                 sc_contracts_init_head(resource);
 500                 ul_list_for_each(reservation_list, rl, fc) {
 501                         s = fres_contract_get_spare_capacity(fc->to_be_reserved_contract);
 502                         if (s && s->granularity == FRSH_GR_DISCRETE) {
 503                                 sc_contracts_insert(resource, fc);
 504                         }
 505                 }
 506         }
 507 err:
 508         ul_list_for_each(reservation_list, rl, fc) {
 509                 fres_contract_destroy(fc->to_be_reserved_contract);
 510                 fc->to_be_reserved_contract = NULL;
 511         }
 512         forb_sequence_free_buf(contracts, forb_no_destructor);
 513         return ret;
 514 }
 515
 516 /**
 517  * Create/change VReses according to @a schedulable_contracts.
 518  *
 519  * There might be more allocators for schedulable contracts, so merge
 520  * adjacent vreses with the same allocator together and create/change
 521  * them in one step. Also the order of schedulable contracts might be
 522  * different from the initial order od ids in commit_contracts()
 523  * therefore we have to search for every contract.
 524  */
 525 static int
 526 change_vreses(struct fcb *fcb, fres_contract_ptr_seq *schedulable_contracts)
 527 {
 528         struct res_alloc *last_ra = NULL;
 529         fres_contract_ptr_seq vreses;
 530         int i, ret;
 531         CORBA_Environment ev;
 532
 533         forb_sequence_alloc_buf(vreses, schedulable_contracts->_length);
 534         vreses._length = 0;
 535
 536         for (i=0; i<schedulable_contracts->_length; i++) {
 537                 struct fcb_contract *fc;
 538                 struct fres_contract *sc = schedulable_contracts->_buffer[i];
 539
 540                 fc = fcb_contract_find(fcb, &sc->id);
 541                 assert(fc != NULL);
 542
 543                 if (true /* TODO: if the schedulable contract is changed */) {
 544                         if (last_ra != fc->ra) {
 545                                 if (vreses._length) {
 546                                         ret = fres_resource_allocator_change_vreses(last_ra->ra,
 547                                                                                     &vreses, &ev);
 548                                         if (forb_exception_occurred(&ev)) {
 549                                                 ret = fres_forbex2err(&ev);
 550                                                 goto err;
 551                                         }
 552                                         if (ret) goto err;
 553                                 }
 554                                 vreses._length = 0;
 555                         }
 556                         vreses._buffer[vreses._length] = sc;
 557                         vreses._length++;
 558                         fres_contract_destroy(fc->schedulable_contract);
 559                         fc->schedulable_contract = fres_contract_duplicate(sc);
 560                         last_ra = fc->ra;
 561
 562                 }
 563         }
 564         ret = fres_resource_allocator_change_vreses(last_ra->ra,
 565                                                     &vreses, &ev);
 566         if (forb_exception_occurred(&ev))
 567                 ret = fres_forbex2err(&ev);
 568 err:
 569         forb_sequence_free_buf(vreses, forb_no_destructor);
 570         return ret;
 571 }
 572
 573 CORBA_long
 574 negotiate_contracts(fres_contract_broker obj,
 575                     const fres_contract_ptr_seq* contracts,
 576                     fres_contract_id_seq** ids_out,
 577                     CORBA_Environment *ev)
 578 {
 579         struct fcb *fcb = o2fcb(obj);
 580         struct resource *resource;
 581         int ret;
 582         forb_server_id app;
 583         fres_contract_ptr_seq *schedulable_contracts;
 584         struct fcb_contract **fcb_contracts, *fc;
 585         unsigned i;
 586         fres_contract_id_seq commit_ids;
 587
 588         /* Prepare output sequence for the case we return eariler with
 589          * an error */
 590         forb_sequence_alloc(*ids_out, 0);
 591         if (!*ids_out) {
 592                 ev->major = FORB_EX_NO_MEMORY;
 593                 goto err;
 594         }
 595         CORBA_sequence_set_release(*ids_out, CORBA_TRUE);
 596
 597         forb_get_req_source(obj, &app);
 598
 599         fcb_contracts = malloc(sizeof(fcb_contracts[0])*contracts->_length);
 600         if (!fcb_contracts) {
 601                 ret = errno;
 602                 goto err;
 603         }
 604         memset(fcb_contracts, 0, sizeof(fcb_contracts[0])*contracts->_length);
 605
 606         ret = prepare_fcb_contracts(fcb, fcb_contracts, &resource,
 607                                     &app, contracts->_buffer, contracts->_length);
 608         if (ret)
 609                 goto err_free_fcb_contracts;
 610
 611         struct reservation_list rl;
 612         prepare_reservation_list(resource,
 613                                  fcb_contracts, contracts->_length,
 614                                  &rl);
 615
 616         /* Allocate all the needed memory before doing reservation. If
 617          * there is no enough memory, it has no sense to call resource
 618          * manager. */
 619         forb_sequence_alloc_buf(commit_ids, rl.length);
 620         if (!commit_ids._buffer) {
 621                 ret = errno;
 622                 goto err_free_fcb_contracts;
 623         }
 624
 625         /* Reserve contracts */
 626         ret = rebalance_spare_capacity_and_reserve(resource, &rl);
 627         if (ret) {
 628                 if (ret == FRSH_ERR_CONTRACT_REJECTED) {
 629                         ul_logmsg("Contract(s) was/were rejected\n");
 630                 } else {
 631                         char msg[100];
 632                         fres_strerror(ret, msg, sizeof(msg));
 633                         ul_logerr("Reservation error: %s\n", msg);
 634                 }
 635                 goto err_free_fcb_contracts;
 636         }
 637
 638         /* Commit contracts */
 639         commit_ids._length = rl.length;
 640         i=0;
 641         ul_list_for_each(reservation_list, &rl, fc) {
 642                 forb_sequence_elem(commit_ids, i) = fc->id;
 643                 i++;
 644         }
 645
 646         fres_resource_manager_commit_contracts(resource->mng, &commit_ids,
 647                                                &schedulable_contracts, ev);
 648         if (forb_exception_occurred(ev)) {
 649                 ret = fres_forbex2err(ev);
 650                 goto err_cancel_reservation;
 651         }
 652
 653         /* Add new contracts to our fcb database for later
 654          * reference. Canceled contracts are removed below. */
 655         for (i=0; i<contracts->_length; i++) {
 656                 fc =  fcb_contracts[i];
 657
 658                 if (fc->user_contract) {
 659                         if (fres_contract_get_num_blocks(fc->requested_contract) > 0) {
 660                                 /* Renegotiation */
 661                                 fres_contract_destroy(fc->user_contract);
 662                                 fc->user_contract = fres_contract_duplicate(fc->requested_contract);
 663                                 /* Note: requested_contract is also
 664                                  * pointed by contracts parameter and
 665                                  * will be freed by FORB. */
 666                                 fc->requested_contract = NULL;
 667                         }
 668                 } else {
 669                         /* Insert new contracts */
 670                         fcb_contract_insert(fcb, fcb_contracts[i]);
 671                         fc->user_contract = fres_contract_duplicate(fc->requested_contract);
 672                         fc->requested_contract = NULL;
 673                         /* See the note above. */
 674                 }
 675         }
 676
 677         ret = change_vreses(fcb, schedulable_contracts);
 678         if (ret)
 679                 goto err_cancel_reservation;
 680
 681         forb_sequence_free(schedulable_contracts, fres_contract_ptr_destroy);
 682         if (ret != 0) {
 683                 ul_logerr("VRes was not created\n");
 684                 goto err_cancel_contracts;
 685         }
 686
 687
 688         /* Return IDs and delete canceled contracts from out database */
 689         forb_sequence_alloc_buf(**ids_out, contracts->_length);
 690         if (!(*ids_out)->_buffer) {
 691                 ev->major = FORB_EX_NO_MEMORY;
 692                 goto err_cancel_contracts;
 693         }
 694         (*ids_out)->_length = contracts->_length;
 695         for (i=0; i<contracts->_length; i++) {
 696                 struct fcb_contract *fc =  fcb_contracts[i];
 697                 forb_sequence_elem(**ids_out, i) = fc->id;
 698
 699                 if (fc->requested_contract &&
 700                     fres_contract_get_num_blocks(fc->requested_contract) == 0) {
 701                         fcb_contract_delete(fcb, fc);
 702                         /* Note: requested_contract is also pointed by
 703                          * contracts parameter and will be freed by FORB. */
 704                         fc->requested_contract = NULL;
 705                         fcb_contract_destroy(fc);
 706                 }
 707         }
 708         return 0;
 709
 710 err_cancel_contracts:
 711         /* TODO */
 712         goto err_free_fcb_contracts;
 713 err_cancel_reservation:
 714         fres_resource_manager_cancel_reservations(resource->mng, &commit_ids, ev);
 715 err_free_fcb_contracts:
 716         for (i=0; i<contracts->_length; i++) {
 717                 fc = fcb_contracts[i];
 718                 if (fc && !fc->user_contract) {
 719                         fcb_contracts[i]->requested_contract = NULL; /* Destroyed by FORB */
 720                         fcb_contract_destroy(fcb_contracts[i]);
 721                 }
 722         }
 723         free(fcb_contracts);
 724 err:
 725         return ret;
 726 }
 727
 728 void redistribute_spare_capacity(fres_contract_broker obj,
 729                                  const frsh_resource_type_t restype,
 730                                  const frsh_resource_id_t resid,
 731                                  CORBA_Environment *ev)
 732 {
 733         struct fcb *fcb = o2fcb(obj);
 734         struct res_key key = {restype, resid };
 735         struct resource *resource;
 736         struct reservation_list rl;
 737
 738         resource = fcb_resource_find(fcb, &key);
 739
 740         prepare_reservation_list(resource, NULL, 0, &rl);
 741
 742 /*      forb_sequence_alloc(ids, rl.length); */
 743 /*      if (!ids || !ids->_buffer) { */
 744 /*              ev->major = FORB_EX_NO_MEMORY; */
 745 /*              goto err_free_fcb_contracts; */
 746 /*      } */
 747 /*      CORBA_sequence_set_release(ids, CORBA_TRUE); */
 748 /*      *ids_out = ids;         /\* ids is freed by FORB *\/ */
 749
 750
 751         rebalance_spare_capacity_and_reserve(resource, &rl);
 752         /* Commit */
 753 }
 754
 755 CORBA_long register_resource(fres_contract_broker obj,
 756                             const frsh_resource_type_t restype,
 757                             const frsh_resource_id_t resid,
 758                             const fres_resource_desc *desc,
 759                             CORBA_Environment *ev)
 760 {
 761         struct fcb *fcb = o2fcb(obj);
 762         struct resource *res, *res2;
 763
 764         res = malloc(sizeof(*res));
 765         if (!res) goto err;
 766         memset(res, 0, sizeof(*res));
 767         res->key.type = restype;
 768         res->key.id = resid;
 769         res2 = fcb_resource_find(fcb, &res->key);
 770         if (res2) {
 771                 if (forb_object_is_stale(res2->mng)) {
 772                         ul_logmsg("Removing stale manager for resource %d.%d\n",
 773                                   restype, resid);
 774                         forb_object_release(res2->mng);
 775                         fcb_resource_delete(fcb, res2);
 776                         /* TODO: Delete also all allocators associated
 777                          * with this stale resource manager. */
 778                         free(res);
 779                         res = res2;
 780                 } else {
 781                         ul_logerr("Resource manager %d.%d already registered\n",
 782                                   restype, resid);
 783                         goto free_err;
 784                 }
 785         }
 786         res->mng = forb_object_duplicate(desc->manager);
 787
 788         fcb_alloc_init_root_field(res);
 789         sc_contracts_init_head(res);
 790         ul_logmsg("Registering manager for resource %d.%d\n",
 791                   restype, resid);
 792         fcb_resource_insert(fcb, res);
 793         return 0;
 794 free_err:
 795         free(res);
 796 err:
 797         return -1;
 798 }
 799
 800
 801 CORBA_long register_allocator(fres_contract_broker obj,
 802                               const frsh_resource_type_t restype,
 803                               const frsh_resource_id_t resid,
 804                               const fres_resource_allocator ra_obj,
 805                               CORBA_Environment *ev)
 806 {
 807         struct fcb *fcb = o2fcb(obj);
 808         struct resource *res;
 809         struct res_alloc *ra;
 810         struct res_key resource;
 811         forb_server_id server_id;
 812         char server_id_str[40];
 813
 814         forb_get_server_id(ra_obj, &server_id);
 815         forb_server_id_to_string(server_id_str, &server_id, sizeof(server_id_str));
 816         ul_logmsg("Registering allocator for resource %d.%d in app %s\n",
 817                   restype, resid, server_id_str);
 818
 819         resource.type = restype;
 820         resource.id = resid;
 821         res = fcb_resource_find(fcb, &resource);
 822         if (!res) {
 823                 ul_logerr("No manager found for %d.%d. Unable to register the allocator!\n",
 824                           restype, resid);
 825                 goto err;
 826         }
 827         ra = fcb_alloc_find(res, &server_id);
 828         if (ra) {
 829                 char *str = forb_object_to_string(ra_obj);
 830                 ul_logerr("Allocator from already registered (%s)\n",
 831                           str);
 832                 forb_free(str);
 833                 goto err;
 834         }
 835         ra = malloc(sizeof(*ra));
 836         if (!ra) {
 837                 goto err;
 838         }
 839         ra->app = server_id;
 840         ra->ra = forb_object_duplicate(ra_obj);
 841         fcb_alloc_insert(res, ra);
 842         return 0;
 843 err:
 844         return FRSH_ERR_RESOURCE_ID_INVALID;
 845 }
 846
 847 void get_resources(fres_contract_broker obj, fres_resource_seq** resources, CORBA_Environment *ev)
 848 {
 849         struct fcb *fcb = o2fcb(obj);
 850         fres_resource_seq *seq;
 851         struct resource *res;
 852         int n;
 853
 854         seq = malloc(sizeof(*seq));
 855         if (!seq) {
 856                 ev->major = FORB_EX_NO_MEMORY;
 857                 return;
 858         }
 859         memset(seq, 0, sizeof(*seq));
 860
 861         n=0;
 862         gavl_cust_for_each(fcb_resource, fcb, res) {
 863                 n++;
 864         }
 865
 866         seq->_buffer = CORBA_sequence_fres_resource_allocbuf(n);
 867         seq->_maximum = n;
 868         seq->_length = n;
 869
 870         n = 0;
 871         gavl_cust_for_each(fcb_resource, fcb, res) {
 872                 seq->_buffer[n].restype = res->key.type;
 873                 seq->_buffer[n].resid = res->key.id;
 874                 seq->_buffer[n].desc.manager = res->mng;
 875                 n++;
 876         }
 877
 878         *resources = seq;
 879 }
 880
 881 #ifdef CONFIG_FCB_INET
 882 static int register_inet_port(forb_orb orb)
 883 {
 884         forb_port_t *port = forb_malloc(sizeof(*port));
 885         int ret;
 886         struct in_addr listen_on;
 887
 888         if (!port)
 889                 return -1;
 890         memset(port, 0, sizeof(*port));
 891         listen_on.s_addr = INADDR_ANY;
 892         ret = forb_inet_port_init(&port->desc, listen_on);
 893         if (ret)
 894                 return ret;
 895         ret = forb_register_port(orb, port);
 896         return ret;
 897 }
 898 #endif
 899
 900 struct forb_fres_contract_broker_impl impl = {
 901         .negotiate_contracts = negotiate_contracts,
 902         .register_resource = register_resource,
 903         .register_allocator = register_allocator,
 904         .redistribute_spare_capacity = redistribute_spare_capacity,
 905         .get_resources = get_resources,
 906 };
 907
 908 void peer_discovery_callback(const forb_orb peer_orb, const char *orb_id)
 909 {
 910         forb_server_id server_id;
 911         char server_id_str[sizeof(forb_server_id)*2+1];
 912
 913         forb_get_server_id(peer_orb, &server_id);
 914         forb_server_id_to_string(server_id_str, &server_id, sizeof(server_id_str));
 915 #if 0
 916         ul_logmsg("peer discovered: %s (orb_id '%s')\n", server_id_str, orb_id);
 917 #endif
 918
 919         if (orb_id == NULL)
 920                 return;
 921
 922         if (strcmp(orb_id, "org.frescor.fcb") == 0) {
 923                 fosa_abs_time_t now;
 924                 fosa_rel_time_t delay;
 925                 fosa_clock_get_time(CLOCK_REALTIME, &now);
 926                 delay = fosa_abs_time_extract_interval(start_time, now);
 927                 ul_logmsg("node joined: %s (time %ld ms)\n", server_id_str,
 928                           fosa_rel_time_to_msec(delay));
 929         }
 930 }
 931
 932 void peer_dead_callback(const forb_orb peer_orb, const char *orb_id)
 933 {
 934 }
 935
 936 int main(int argc, char *argv[])
 937 {
 938         forb_orb orb;
 939         struct fcb fcb_data;
 940         fres_contract_broker fcb;
 941         forb_executor_t executor;
 942         int ret;
 943         forb_init_attr_t attr = {
 944                 .orb_id = "org.frescor.fcb",
 945                 .peer_discovery_callback = peer_discovery_callback,
 946                 .peer_dead_callback = peer_dead_callback,
 947         };
 948
 949
 950         fosa_clock_get_time(CLOCK_REALTIME, &start_time);
 951
 952         orb = forb_init(&argc, &argv, &attr);
 953         if (!orb) error(1, errno, "FORB initialization failed");
 954
 955 #ifdef CONFIG_FCB_INET
 956         ret = register_inet_port(orb);
 957         if (ret) error(0, errno, "INET port registration failed");
 958 #endif
 959
 960         fcb_resource_init_root_field(&fcb_data);
 961         fcb_contract_init_root_field(&fcb_data);
 962
 963         fcb = forb_fres_contract_broker_new(orb, &impl, &fcb_data);
 964         if (!fcb) error(1, errno, "forb_fres_contract_broker_new failed");
 965
 966         /* Prepare executor before we register the fcb reference,
 967          * so that no reuqests are lost */
 968         ret = forb_executor_init(&executor);
 969         if (ret) error(1, errno, "forb_executor_init failed");
 970
 971         ret = forb_executor_register_object(&executor, fcb);
 972         if (ret) error(1, errno, "forb_executor_register_object failed");
 973
 974         ret = forb_register_reference(fcb, fres_contract_broker_reg_name);
 975         if (ret) error(1, errno, "forb_register_reference() failed");
 976
 977         ul_logmsg("Waiting for requests\n");
 978         ret = forb_executor_run(&executor);
 979         if (ret) error(1, errno, "forb_executor_run failed");
 980
 981         return 0;
 982 }