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         char *name;
  93         fres_resource_manager mng; /**< Object reference of the resource manager */
  94         gavl_cust_root_field_t allocators; /**< Registered allocators for this resource (from multiple applications/nodes) */
  95         ul_list_head_t sc_contracts; /**< Negotiated contracts with spare capacity for this resource */
  96 };
  97
  98 /**
  99  * Resource allocator registered in different nodes/applications
 100  */
 101 struct res_alloc {
 102         gavl_node_t node;
 103         forb_server_id app;
 104         fres_resource_allocator ra;
 105 };
 106
 107 struct fcb_contract {
 108         fres_contract_id_t id;
 109         struct res_alloc *ra;   /**< Allocator for this contract TODO: Remove contract if allocator is destroyed */
 110         gavl_node_t node_fcb;
 111         ul_list_node_t node_sc;
 112         ul_list_node_t node_reservation;
 113         struct {
 114                 int initial;
 115                 int try;
 116         } sc_variant;
 117         fosa_abs_time_t end_of_stability_period;
 118         struct fres_contract *user_contract; /* The contract sent by user. Set after sucessfull neotiation. */
 119         struct fres_contract *requested_contract; /* User request for the contract. Set by prepare_reservation_requests() in the beginning of negotiation. */
 120         struct fres_contract *to_be_reserved_contract;
 121         struct fres_contract *schedulable_contract;
 122 };
 123
 124 /**
 125  * Contract broker data
 126  */
 127 struct fcb {
 128         gavl_cust_root_field_t resources; /**< Registered resources */
 129         gavl_cust_root_field_t contracts; /**< Contracts negotiated by this FCB */
 130 };
 131
 132 /** List of contracts to be reserved during spare capacity rebalancing */
 133 struct reservation_list {
 134         ul_list_head_t fcb_contracts;
 135         unsigned length;
 136 };
 137
 138 struct fcb_contract *fcb_contract_new(fres_contract_id_t *id)
 139 {
 140         struct fcb_contract *fcb_contract;
 141
 142         fcb_contract = malloc(sizeof(*fcb_contract));
 143         if (!fcb_contract) {
 144                 return NULL;
 145         }
 146         memset(fcb_contract, 0, sizeof(*fcb_contract));
 147         fcb_contract->id = *id;
 148
 149         return fcb_contract;
 150 }
 151
 152 void fcb_contract_destroy(struct fcb_contract *fcb_contract)
 153 {
 154         if (fcb_contract->user_contract) {
 155                 fres_contract_destroy(fcb_contract->user_contract);
 156         }
 157         if (fcb_contract->to_be_reserved_contract) {
 158                 fres_contract_destroy(fcb_contract->to_be_reserved_contract);
 159         }
 160         if (fcb_contract->requested_contract) {
 161                 fres_contract_destroy(fcb_contract->requested_contract);
 162         }
 163         if (fcb_contract->schedulable_contract) {
 164                 fres_contract_destroy(fcb_contract->requested_contract);
 165         }
 166         free(fcb_contract);
 167 }
 168
 169 static inline int res_key_cmp(const struct res_key *a,
 170                               const struct res_key *b)
 171 {
 172         if (a->type < b->type) {
 173                 return -1;
 174         } else if (a->type > b->type) {
 175                 return +1;
 176         } else if (a->id < b->id) {
 177                 return -1;
 178         } else if (a->id > b->id) {
 179                 return +1;
 180         } else {
 181                 return 0;
 182         }
 183 }
 184
 185 /* Container for registered resources */
 186 GAVL_CUST_NODE_INT_DEC(fcb_resource   /* cust_prefix */,                \
 187                        struct fcb     /* cust_root_t */,                \
 188                        struct resource/* cust_item_t */,                \
 189                        struct res_key /* cust_key_t */,                 \
 190                        resources      /* cust_root_node */,             \
 191                        node           /* cust_item_node */,             \
 192                        key            /* cust_item_key */,              \
 193                        res_key_cmp    /* cust_cmp_fnc */);
 194
 195 GAVL_CUST_NODE_INT_IMP(fcb_resource   /* cust_prefix */,                \
 196                        struct fcb     /* cust_root_t */,                \
 197                        struct resource/* cust_item_t */,                \
 198                        struct res_key /* cust_key_t */,                 \
 199                        resources      /* cust_root_node */,             \
 200                        node           /* cust_item_node */,             \
 201                        key            /* cust_item_key */,              \
 202                        res_key_cmp    /* cust_cmp_fnc */);
 203
 204 /* Container for allocators registered for a given resource */
 205 GAVL_CUST_NODE_INT_DEC(fcb_alloc        /* cust_prefix */,              \
 206                        struct resource  /* cust_root_t */,              \
 207                        struct res_alloc /* cust_item_t */,              \
 208                        forb_server_id   /* cust_key_t */,               \
 209                        allocators       /* cust_root_node */,           \
 210                        node             /* cust_item_node */,           \
 211                        app              /* cust_item_key */,            \
 212                        fres_contract_id_cmp /* cust_cmp_fnc */);
 213
 214 GAVL_CUST_NODE_INT_IMP(fcb_alloc        /* cust_prefix */,              \
 215                        struct resource   /* cust_root_t */,             \
 216                        struct res_alloc /* cust_item_t */,              \
 217                        forb_server_id   /* cust_key_t */,               \
 218                        allocators       /* cust_root_node */,           \
 219                        node             /* cust_item_node */,           \
 220                        app              /* cust_item_key */,            \
 221                        forb_server_id_cmp /* cust_cmp_fnc */);
 222
 223 /* Container for contracts with spare capacity negotiated for a given resource */
 224 UL_LIST_CUST_DEC(sc_contracts        /* cust_prefix */,                 \
 225                  struct resource  /* cust_head_t */,                    \
 226                  struct fcb_contract /* cust_item_t */,                 \
 227                  sc_contracts   /* cust_head_field */,                  \
 228                  node_sc        /* cust_node_field */);
 229
 230 UL_LIST_CUST_DEC(reservation_list        /* cust_prefix */,             \
 231                  struct reservation_list  /* cust_head_t */,            \
 232                  struct fcb_contract /* cust_item_t */,                 \
 233                  fcb_contracts  /* cust_head_field */,                  \
 234                  node_reservation /* cust_node_field */);
 235
 236 /* Container for negotiated contracts */
 237 GAVL_CUST_NODE_INT_DEC(fcb_contract         /* cust_prefix */,          \
 238                        struct fcb           /* cust_root_t */,          \
 239                        struct fcb_contract  /* cust_item_t */,          \
 240                        fres_contract_id_t   /* cust_key_t */,           \
 241                        contracts            /* cust_root_node */,       \
 242                        node_fcb             /* cust_item_node */,       \
 243                        id                   /* cust_item_key */,        \
 244                        fres_contract_id_cmp /* cust_cmp_fnc */);
 245
 246 #if 1
 247 GAVL_CUST_NODE_INT_IMP(fcb_contract         /* cust_prefix */,          \
 248                        struct fcb           /* cust_root_t */,          \
 249                        struct fcb_contract  /* cust_item_t */,          \
 250                        fres_contract_id_t   /* cust_key_t */,           \
 251                        contracts            /* cust_root_node */,       \
 252                        node_fcb             /* cust_item_node */,       \
 253                        id                   /* cust_item_key */,        \
 254                        fres_contract_id_cmp /* cust_cmp_fnc */);
 255 #else
 256 #include "fcb_contract_gavl.inc"
 257 #endif
 258
 259
 260 #define o2fcb(o) (struct fcb*)forb_instance_data(o)
 261
 262 struct res_key*
 263 get_res_key(const struct fres_contract *contract, struct res_key *key)
 264 {
 265         fres_block_resource *block_res;
 266
 267         block_res = fres_contract_get_resource(contract);
 268         if (!block_res) {
 269                 ul_logerr("No resource specified\n");
 270                 return NULL;
 271         } else {
 272                 key->type = block_res->resource_type;
 273                 key->id = block_res->resource_id;
 274         }
 275         return key;
 276 }
 277
 278 /**
 279  * Fills in an array of fcb_contracts according to requests submited
 280  * to negotiate_contracts(). For every contract in @a contracts, there
 281  * is one fcb_contract in @a fcb_contracts array.
 282  *
 283  * @param fcb
 284  * @param fcb_contracts Where to store pointers to fcb_contracts
 285  * @param resource Resource for which negotiation is being done.
 286  * @param app Application which requests negotiation
 287  * @param contracts Contracts submited to negotiate_contracts()
 288  * @param num Number of contracts in contracts (which is the same as the number in fcb_contracts).
 289  *
 290  * @return Zero on success, non-zero error code on error.
 291  */
 292 static int
 293 prepare_fcb_contracts(struct fcb *fcb, struct fcb_contract *fcb_contracts[],
 294                       struct resource **resource,
 295                       forb_server_id *app,
 296                       struct fres_contract *contracts[], int num)
 297 {
 298         unsigned i;
 299         struct fcb_contract *fc;
 300         struct res_alloc *ra;
 301         struct res_key key, key2 = {-1,-1};
 302
 303         for (i=0; i<num; i++) {
 304                 struct fres_contract *c = contracts[i];
 305
 306                 if (fres_contract_id_is_empty(&c->id)) {
 307                         /* Normal negotiation request */
 308                         forb_uuid_generate((forb_uuid_t *)&c->id);
 309                         fc = fcb_contract_new(&c->id);
 310                         if (!fc)
 311                                 return errno;
 312                         fcb_contracts[i] = fc;
 313                         if (!get_res_key(c, &key)) {
 314                                 return FRSH_ERR_RESOURCE_ID_INVALID;
 315                         }
 316                 } else {
 317                         fc = fcb_contract_find(fcb, &c->id);
 318                         if (!fc) {
 319                                 char str[60];
 320                                 fres_contract_id_to_string(str, &c->id, sizeof(str));
 321                                 ul_logerr("Attempt to change unknown contract %s\n", str);
 322                                 return FRES_ERR_NOTHING_TO_RENEGOTIATE;
 323                         } else {
 324                                 fcb_contracts[i] = fc;
 325                                 if (fres_contract_get_num_blocks(c) == 0) {
 326                                         /* Cancelation */
 327                                         get_res_key(fc->user_contract, &key);
 328                                 } else {
 329                                         /* Renegotiation */
 330                                         if (!get_res_key(c, &key)) {
 331                                                 return FRSH_ERR_RESOURCE_ID_INVALID;
 332                                         }
 333                                 }
 334                         }
 335                 }
 336                 fc->requested_contract = c;
 337
 338                 /* Check that all contracts are for the same resource */
 339                 if (i==0) {
 340                         key2 = key;
 341                         *resource = fcb_resource_find(fcb, &key);
 342                         if (!*resource) {
 343                                 ul_logerr("No resource manager for %d.%d registered\n",
 344                                           key.type, key.id);
 345                                 return FRSH_ERR_RESOURCE_ID_INVALID;
 346                         }
 347                 }
 348                 else if (key.type != key2.type ||
 349                          key.id   != key2.id) {
 350                         ul_logerr("Contract #%d differs in resource!\n", i);
 351                         return FRSH_ERR_RESOURCE_ID_INVALID;
 352                 }
 353
 354                 /* Find allocator for this request */
 355                 ra = fcb_alloc_find(*resource, app);
 356                 if (!ra) {
 357                         char str[60];
 358                         forb_server_id_to_string(str, app, sizeof(str));
 359                         ul_logerr("No resource allocator found for %d.%d and %s\n",
 360                                   (*resource)->key.type, (*resource)->key.id, str);
 361                         return FRES_ERR_NO_RESOURCE_ALLOCATOR;
 362                 }
 363                 fc->ra = ra;
 364         }
 365         return 0;
 366 }
 367
 368 /**
 369  * @param resource Resource for which to rebalance capacity and negotiate new contracts
 370  * @param fcb_contract New requests to negotiate
 371  * @param num The number of elements in @a fcb_contract
 372  * @param[out] rl List with changed contracts to be commited
 373  */
 374 static void
 375 prepare_reservation_list(struct resource *resource,
 376                          struct fcb_contract *fcb_contract[], int num,
 377                          struct reservation_list *rl)
 378 {
 379         int i;
 380         fosa_abs_time_t now;
 381         struct fcb_contract *fc;
 382
 383         reservation_list_init_head(rl);
 384         rl->length = 0;
 385         for (i=0; i<num; i++) {
 386                 assert(fcb_contract[i]->requested_contract != NULL);
 387                 reservation_list_insert(rl, fcb_contract[i]);
 388                 rl->length++;
 389         }
 390         fosa_clock_get_time(CLOCK_REALTIME, &now);
 391         ul_list_for_each(sc_contracts, resource, fc) {
 392                 if (fosa_abs_time_smaller(fc->end_of_stability_period, now) &&
 393                     fc->requested_contract == NULL) /* Do not insert contract inserted above */
 394                 {
 395                         reservation_list_insert(rl, fc);
 396                         rl->length++;
 397                 }
 398         }
 399 }
 400
 401 /**
 402  *
 403  *
 404  * @param resource Resource for which to rebalance capacity and negotiate new contracts
 405  * @param rl List with changed contracts to be commited
 406  *
 407  * @return Zero on success, non-zero error code on error
 408  */
 409 static int
 410 rebalance_spare_capacity_and_reserve(struct resource *resource,
 411                                      struct reservation_list *rl)
 412 {
 413         int ret;
 414         unsigned i;
 415         struct fcb_contract *fc;
 416         fres_block_spare_capacity *s;
 417
 418         fres_contract_ptr_seq contracts;
 419         if (!forb_sequence_alloc_buf(contracts, rl->length)) {
 420                 return errno;
 421         }
 422         contracts._length = rl->length;
 423         i=0;
 424         /* Initialize optimization */
 425         ul_list_for_each(reservation_list, rl, fc) {
 426                 fc->to_be_reserved_contract =
 427                         fc->requested_contract ? fres_contract_duplicate(fc->requested_contract) :
 428                         fc->user_contract ? fres_contract_duplicate(fc->user_contract) :
 429                         NULL;
 430                 assert(fc->to_be_reserved_contract != NULL);
 431
 432                 forb_sequence_elem(contracts, i) = fc->to_be_reserved_contract;
 433                 i++;
 434
 435                 s = fres_contract_get_spare_capacity(fc->to_be_reserved_contract);
 436                 if (s && s->granularity == FRSH_GR_DISCRETE) {
 437                         fc->sc_variant.initial = s->variants._length - 1;
 438                         fc->sc_variant.try = fc->sc_variant.initial;
 439                 }
 440         }
 441
 442         bool all_combinations_tried;
 443         int criterion, best_criterion = -1;
 444         struct fcb_contract *fcb_changed;
 445         /* Exhaustive search. Try all combinations of spare capacity
 446          * variants and find the one with best creterion. */
 447         do {
 448                 all_combinations_tried = true;
 449                 fcb_changed = NULL;
 450                 criterion = 0;
 451                 /* Prepare spare capacity variant */
 452                 ul_list_for_each(reservation_list, rl, fc) {
 453                         s = fres_contract_get_spare_capacity(fc->to_be_reserved_contract);
 454                         /* TODO: Simulate continuous granularity by discretization */
 455                         if (s && s->granularity == FRSH_GR_DISCRETE) {
 456                                 fres_container_copy(fc->to_be_reserved_contract->container,
 457                                                     forb_sequence_elem(s->variants, fc->sc_variant.try));
 458                                 criterion += fc->sc_variant.try;
 459
 460                                 if (fcb_changed == NULL) {
 461                                         /* Chnage tried variant for the next round */
 462                                         fc->sc_variant.try = fc->sc_variant.try > 0 ?
 463                                                 fc->sc_variant.try - 1 :
 464                                                 s->variants._length - 1;
 465                                         /* Do not change other
 466                                          * contracts unless we have
 467                                          * tried all variants */
 468                                         if (fc->sc_variant.try != fc->sc_variant.initial) {
 469                                                 fcb_changed = fc;
 470                                         }
 471                                 }
 472                                 if (fc->sc_variant.try != fc->sc_variant.initial)
 473                                         all_combinations_tried = false;
 474                         }
 475                 }
 476
 477                 if (criterion > best_criterion) {
 478                         CORBA_Environment ev;
 479                         /* Reserve contract */
 480                         ret = fres_resource_manager_reserve_contracts(resource->mng, &contracts, &ev);
 481                         if (forb_exception_occurred(&ev)) {
 482                                 ret = fres_forbex2err(&ev);
 483                                 ul_logerr("FORB exception when reserving contracts\n");
 484                                 goto err;
 485                         }
 486                         if (ret < 0) {
 487                                 ul_logerr("Contract reservation error %d\n", ret);
 488                                 ret = FRES_ERR_ADMISSION_TEST;
 489                                 goto err;
 490                         }
 491                         if (ret == 0) { /* negotiation succeeded */
 492                                 best_criterion = criterion;
 493                         }
 494                 }
 495         } while (!all_combinations_tried);
 496
 497         if (best_criterion == -1) {
 498                 ret = FRSH_ERR_CONTRACT_REJECTED;
 499         } else {
 500                 /* At least some variant succeeded */
 501                 ret = 0;
 502                 sc_contracts_init_head(resource);
 503                 ul_list_for_each(reservation_list, rl, fc) {
 504                         s = fres_contract_get_spare_capacity(fc->to_be_reserved_contract);
 505                         if (s && s->granularity == FRSH_GR_DISCRETE) {
 506                                 sc_contracts_insert(resource, fc);
 507                         }
 508                 }
 509         }
 510 err:
 511         ul_list_for_each(reservation_list, rl, fc) {
 512                 fres_contract_destroy(fc->to_be_reserved_contract);
 513                 fc->to_be_reserved_contract = NULL;
 514         }
 515         forb_sequence_free_buf(contracts, forb_no_destructor);
 516         return ret;
 517 }
 518
 519 /**
 520  * Create/change VReses according to @a schedulable_contracts.
 521  *
 522  * There might be more allocators for schedulable contracts, so merge
 523  * adjacent vreses with the same allocator together and create/change
 524  * them in one step. Also the order of schedulable contracts might be
 525  * different from the initial order od ids in commit_contracts()
 526  * therefore we have to search for every contract.
 527  */
 528 static int
 529 change_vreses(struct fcb *fcb, fres_contract_ptr_seq *schedulable_contracts)
 530 {
 531         struct res_alloc *last_ra = NULL;
 532         fres_contract_ptr_seq vreses;
 533         int i, ret;
 534         CORBA_Environment ev;
 535
 536         if (!forb_sequence_alloc_buf(vreses, schedulable_contracts->_length)) {
 537                 return errno;
 538         }
 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 = NULL;
 586         int ret = 0;
 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         if (!forb_sequence_alloc_buf(commit_ids, rl.length)) {
 625                 ret = errno;
 626                 goto err_free_fcb_contracts;
 627         }
 628
 629         /* Reserve contracts */
 630         ret = rebalance_spare_capacity_and_reserve(resource, &rl);
 631         if (ret) {
 632                 if (ret == FRSH_ERR_CONTRACT_REJECTED) {
 633                         ul_logmsg("Contract(s) was/were rejected\n");
 634                 } else {
 635                         char msg[100];
 636                         fres_strerror(ret, msg, sizeof(msg));
 637                         ul_logerr("Reservation error: %s\n", msg);
 638                 }
 639                 goto err_free_fcb_contracts;
 640         }
 641
 642         /* Commit contracts */
 643         commit_ids._length = rl.length;
 644         i=0;
 645         ul_list_for_each(reservation_list, &rl, fc) {
 646                 forb_sequence_elem(commit_ids, i) = fc->id;
 647                 i++;
 648         }
 649
 650         fres_resource_manager_commit_contracts(resource->mng, &commit_ids,
 651                                                &schedulable_contracts, ev);
 652         if (forb_exception_occurred(ev)) {
 653                 ret = fres_forbex2err(ev);
 654                 goto err_cancel_reservation;
 655         }
 656
 657         /* Add new contracts to our fcb database for later
 658          * reference. Canceled contracts are removed below. */
 659         for (i=0; i<contracts->_length; i++) {
 660                 fc =  fcb_contracts[i];
 661
 662                 if (fc->user_contract) {
 663                         if (fres_contract_get_num_blocks(fc->requested_contract) > 0) {
 664                                 /* Renegotiation */
 665                                 fres_contract_destroy(fc->user_contract);
 666                                 fc->user_contract = fres_contract_duplicate(fc->requested_contract);
 667                                 /* Note: requested_contract is also
 668                                  * pointed by contracts parameter and
 669                                  * will be freed by FORB. */
 670                                 fc->requested_contract = NULL;
 671                         }
 672                 } else {
 673                         /* Insert new contracts */
 674                         fcb_contract_insert(fcb, fcb_contracts[i]);
 675                         fc->user_contract = fres_contract_duplicate(fc->requested_contract);
 676                         fc->requested_contract = NULL;
 677                         /* See the note above. */
 678                 }
 679         }
 680
 681         ret = change_vreses(fcb, schedulable_contracts);
 682         if (ret)
 683                 goto err_cancel_reservation;
 684
 685         forb_sequence_free(schedulable_contracts, fres_contract_ptr_destroy);
 686         if (ret != 0) {
 687                 ul_logerr("VRes was not created\n");
 688                 goto err_cancel_contracts;
 689         }
 690
 691
 692         /* Return IDs and delete canceled contracts from out database */
 693         if (!forb_sequence_alloc_buf(**ids_out, contracts->_length)) {
 694                 ev->major = FORB_EX_NO_MEMORY;
 695                 goto err_cancel_contracts;
 696         }
 697         (*ids_out)->_length = contracts->_length;
 698         for (i=0; i<contracts->_length; i++) {
 699                 struct fcb_contract *fc =  fcb_contracts[i];
 700                 forb_sequence_elem(**ids_out, i) = fc->id;
 701
 702                 if (fc->requested_contract &&
 703                     fres_contract_get_num_blocks(fc->requested_contract) == 0) {
 704                         fcb_contract_delete(fcb, fc);
 705                         /* Note: requested_contract is also pointed by
 706                          * contracts parameter and will be freed by FORB. */
 707                         fc->requested_contract = NULL;
 708                         fcb_contract_destroy(fc);
 709                 }
 710         }
 711         return 0;
 712
 713 err_cancel_contracts:
 714         /* TODO */
 715         goto err_free_fcb_contracts;
 716 err_cancel_reservation:
 717         fres_resource_manager_cancel_reservations(resource->mng, &commit_ids, ev);
 718 err_free_fcb_contracts:
 719         for (i=0; i<contracts->_length; i++) {
 720                 fc = fcb_contracts[i];
 721                 if (fc && !fc->user_contract) {
 722                         fcb_contracts[i]->requested_contract = NULL; /* Destroyed by FORB */
 723                         fcb_contract_destroy(fcb_contracts[i]);
 724                 }
 725         }
 726         free(fcb_contracts);
 727 err:
 728         return ret;
 729 }
 730
 731 void redistribute_spare_capacity(fres_contract_broker obj,
 732                                  const frsh_resource_type_t restype,
 733                                  const frsh_resource_id_t resid,
 734                                  CORBA_Environment *ev)
 735 {
 736         struct fcb *fcb = o2fcb(obj);
 737         struct res_key key = {restype, resid };
 738         struct resource *resource;
 739         struct reservation_list rl;
 740
 741         resource = fcb_resource_find(fcb, &key);
 742
 743         prepare_reservation_list(resource, NULL, 0, &rl);
 744
 745 /*      forb_sequence_alloc(ids, rl.length); */
 746 /*      if (!ids || !ids->_buffer) { */
 747 /*              ev->major = FORB_EX_NO_MEMORY; */
 748 /*              goto err_free_fcb_contracts; */
 749 /*      } */
 750 /*      CORBA_sequence_set_release(ids, CORBA_TRUE); */
 751 /*      *ids_out = ids;         /\* ids is freed by FORB *\/ */
 752
 753
 754         rebalance_spare_capacity_and_reserve(resource, &rl);
 755         /* Commit */
 756 }
 757
 758 CORBA_long register_resource(fres_contract_broker obj,
 759                             const frsh_resource_type_t restype,
 760                             const frsh_resource_id_t resid,
 761                             const fres_resource_desc *desc,
 762                             CORBA_Environment *ev)
 763 {
 764         struct fcb *fcb = o2fcb(obj);
 765         struct resource *res, *res2;
 766
 767         res = malloc(sizeof(*res));
 768         if (!res) goto err;
 769         memset(res, 0, sizeof(*res));
 770         res->key.type = restype;
 771         res->key.id = resid;
 772         res2 = fcb_resource_find(fcb, &res->key);
 773         if (res2) {
 774                 if (forb_object_is_stale(res2->mng)) {
 775                         ul_logmsg("Removing stale manager for resource %d.%d\n",
 776                                   restype, resid);
 777                         forb_object_release(res2->mng);
 778                         fcb_resource_delete(fcb, res2);
 779                         /* TODO: Delete also all allocators associated
 780                          * with this stale resource manager. */
 781                         free(res);
 782                         res = res2;
 783                 } else {
 784                         ul_logerr("Resource manager %d.%d already registered\n",
 785                                   restype, resid);
 786                         goto free_err;
 787                 }
 788         }
 789         res->mng = forb_object_duplicate(desc->manager);
 790         res->name = desc->name;
 791
 792         fcb_alloc_init_root_field(res);
 793         sc_contracts_init_head(res);
 794         ul_logmsg("Registering manager for resource \"%s\" (%d.%d)\n",
 795                   res->name, restype, resid);
 796         fcb_resource_insert(fcb, res);
 797         return 0;
 798 free_err:
 799         free(res);
 800 err:
 801         return -1;
 802 }
 803
 804
 805 CORBA_long register_allocator(fres_contract_broker obj,
 806                               const frsh_resource_type_t restype,
 807                               const frsh_resource_id_t resid,
 808                               const fres_resource_allocator ra_obj,
 809                               CORBA_Environment *ev)
 810 {
 811         struct fcb *fcb = o2fcb(obj);
 812         struct resource *res;
 813         struct res_alloc *ra;
 814         struct res_key resource;
 815         forb_server_id server_id;
 816         char server_id_str[40];
 817
 818         forb_get_server_id(ra_obj, &server_id);
 819         forb_server_id_to_string(server_id_str, &server_id, sizeof(server_id_str));
 820         ul_logmsg("Registering allocator for resource %d.%d in app %s\n",
 821                   restype, resid, server_id_str);
 822
 823         resource.type = restype;
 824         resource.id = resid;
 825         res = fcb_resource_find(fcb, &resource);
 826         if (!res) {
 827                 ul_logerr("No manager found for %d.%d. Unable to register the allocator!\n",
 828                           restype, resid);
 829                 goto err;
 830         }
 831         ra = fcb_alloc_find(res, &server_id);
 832         if (ra) {
 833                 char *str = forb_object_to_string(ra_obj);
 834                 ul_logerr("Allocator from already registered (%s)\n",
 835                           str);
 836                 forb_free(str);
 837                 goto err;
 838         }
 839         ra = malloc(sizeof(*ra));
 840         if (!ra) {
 841                 goto err;
 842         }
 843         ra->app = server_id;
 844         ra->ra = forb_object_duplicate(ra_obj);
 845         fcb_alloc_insert(res, ra);
 846         return 0;
 847 err:
 848         return FRSH_ERR_RESOURCE_ID_INVALID;
 849 }
 850
 851 void get_resources(fres_contract_broker obj, fres_resource_seq** resources, CORBA_Environment *ev)
 852 {
 853         struct fcb *fcb = o2fcb(obj);
 854         fres_resource_seq *seq;
 855         struct resource *res;
 856         int n;
 857
 858         seq = malloc(sizeof(*seq));
 859         if (!seq) {
 860                 ev->major = FORB_EX_NO_MEMORY;
 861                 return;
 862         }
 863         memset(seq, 0, sizeof(*seq));
 864
 865         n=0;
 866         gavl_cust_for_each(fcb_resource, fcb, res) {
 867                 n++;
 868         }
 869
 870         seq->_buffer = CORBA_sequence_fres_resource_allocbuf(n);
 871         seq->_maximum = n;
 872         seq->_length = n;
 873
 874         n = 0;
 875         gavl_cust_for_each(fcb_resource, fcb, res) {
 876                 seq->_buffer[n].restype = res->key.type;
 877                 seq->_buffer[n].resid = res->key.id;
 878                 seq->_buffer[n].desc.manager = res->mng;
 879                 seq->_buffer[n].desc.name = res->name;
 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 }