src/filter_virt_db.cpp

   1 /* This file is part of Metaproxy.
   2    Copyright (C) 2005-2010 Index Data
   3
   4 Metaproxy is free software; you can redistribute it and/or modify it under
   5 the terms of the GNU General Public License as published by the Free
   6 Software Foundation; either version 2, or (at your option) any later
   7 version.
   8
   9 Metaproxy is distributed in the hope that it will be useful, but WITHOUT ANY
  10 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17 */
  18
  19 #include "config.hpp"
  20
  21 #include "filter_virt_db.hpp"
  22 #include <metaproxy/package.hpp>
  23
  24 #include <boost/thread/mutex.hpp>
  25 #include <boost/thread/condition.hpp>
  26 #include <boost/shared_ptr.hpp>
  27
  28 #include <metaproxy/util.hpp>
  29
  30 #include <yaz/zgdu.h>
  31 #include <yaz/otherinfo.h>
  32 #include <yaz/diagbib1.h>
  33 #include <yaz/match_glob.h>
  34
  35 #include <map>
  36 #include <iostream>
  37
  38 namespace mp = metaproxy_1;
  39 namespace yf = mp::filter;
  40
  41 namespace metaproxy_1 {
  42     namespace filter {
  43
  44         struct VirtualDB::Set {
  45             Set(BackendPtr b, std::string setname);
  46             Set();
  47             ~Set();
  48
  49             BackendPtr m_backend;
  50             std::string m_setname;
  51         };
  52         struct VirtualDB::Map {
  53             Map(std::string database, std::list<std::string> targets, std::string route);
  54             Map();
  55             bool match(const std::string db) const;
  56             std::string m_dbpattern;
  57             std::list<std::string> m_targets;
  58             std::string m_route;
  59         };
  60         struct VirtualDB::Backend {
  61             mp::Session m_backend_session;
  62             std::list<std::string> m_frontend_databases;
  63             std::list<std::string> m_targets;
  64             std::string m_route;
  65             bool m_named_result_sets;
  66             int m_number_of_sets;
  67         };
  68         struct VirtualDB::Frontend {
  69             Frontend(Rep *rep);
  70             ~Frontend();
  71             mp::Session m_session;
  72             bool m_is_virtual;
  73             bool m_in_use;
  74             yazpp_1::GDU m_init_gdu;
  75             std::list<BackendPtr> m_backend_list;
  76             std::map<std::string,VirtualDB::Set> m_sets;
  77
  78             void search(Package &package, Z_APDU *apdu);
  79             void present(Package &package, Z_APDU *apdu);
  80             void scan(Package &package, Z_APDU *apdu);
  81
  82             void close(Package &package);
  83             typedef std::map<std::string,VirtualDB::Set>::iterator Sets_it;
  84
  85             void fixup_package(Package &p, BackendPtr b);
  86             void fixup_npr_record(ODR odr, Z_NamePlusRecord *npr,
  87                                   BackendPtr b);
  88             void fixup_npr_records(ODR odr, Z_Records *records,
  89                                    BackendPtr b);
  90
  91             BackendPtr lookup_backend_from_databases(
  92                 std::list<std::string> databases);
  93             BackendPtr create_backend_from_databases(
  94                 std::list<std::string> databases,
  95                 int &error_code,
  96                 std::string &failing_database);
  97
  98             BackendPtr init_backend(std::list<std::string> database,
  99                                     Package &package,
 100                                     int &error_code, std::string &addinfo);
 101             Rep *m_p;
 102         };
 103         class VirtualDB::Rep {
 104             friend class VirtualDB;
 105             friend struct Frontend;
 106
 107             FrontendPtr get_frontend(Package &package);
 108             void release_frontend(Package &package);
 109         private:
 110             std::list<VirtualDB::Map>m_maps;
 111             typedef std::map<std::string,VirtualDB::Set>::iterator Sets_it;
 112             boost::mutex m_mutex;
 113             boost::condition m_cond_session_ready;
 114             std::map<mp::Session, FrontendPtr> m_clients;
 115             bool pass_vhosts;
 116         };
 117     }
 118 }
 119
 120 yf::VirtualDB::BackendPtr yf::VirtualDB::Frontend::lookup_backend_from_databases(
 121     std::list<std::string> databases)
 122 {
 123     std::list<BackendPtr>::const_iterator map_it;
 124     map_it = m_backend_list.begin();
 125     for (; map_it != m_backend_list.end(); map_it++)
 126         if ((*map_it)->m_frontend_databases == databases)
 127             return *map_it;
 128     BackendPtr null;
 129     return null;
 130 }
 131
 132 yf::VirtualDB::BackendPtr yf::VirtualDB::Frontend::create_backend_from_databases(
 133     std::list<std::string> databases, int &error_code, std::string &addinfo)
 134 {
 135     BackendPtr b(new Backend);
 136     std::list<std::string>::const_iterator db_it = databases.begin();
 137
 138     b->m_number_of_sets = 0;
 139     b->m_frontend_databases = databases;
 140     b->m_named_result_sets = false;
 141
 142     bool first_route = true;
 143
 144     std::map<std::string,bool> targets_dedup;
 145     for (; db_it != databases.end(); db_it++)
 146     {
 147         std::list<VirtualDB::Map>::const_iterator map_it;
 148         map_it = m_p->m_maps.begin();
 149         while (map_it != m_p->m_maps.end())
 150         {
 151             if (map_it->match(*db_it))
 152                 break;
 153             map_it++;
 154         }
 155
 156         if (map_it == m_p->m_maps.end())  // database not found
 157         {
 158             error_code = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
 159             addinfo = *db_it;
 160             BackendPtr ptr;
 161             return ptr;
 162         }
 163         std::list<std::string>::const_iterator t_it =
 164             map_it->m_targets.begin();
 165         for (; t_it != map_it->m_targets.end(); t_it++) {
 166             if (!targets_dedup[*t_it])
 167             {
 168                 targets_dedup[*t_it] = true;
 169                 b->m_targets.push_back(*t_it);
 170             }
 171         }
 172
 173         // see if we have a route conflict.
 174         if (!first_route && b->m_route != map_it->m_route)
 175         {
 176             // we have a conflict..
 177             error_code =  YAZ_BIB1_COMBI_OF_SPECIFIED_DATABASES_UNSUPP;
 178             BackendPtr ptr;
 179             return ptr;
 180         }
 181         b->m_route = map_it->m_route;
 182         first_route = false;
 183     }
 184     return b;
 185 }
 186
 187 yf::VirtualDB::BackendPtr yf::VirtualDB::Frontend::init_backend(
 188     std::list<std::string> databases, mp::Package &package,
 189     int &error_code, std::string &addinfo)
 190 {
 191     BackendPtr b = create_backend_from_databases(databases, error_code,
 192                                                  addinfo);
 193     if (!b)
 194         return b;
 195     Package init_package(b->m_backend_session, package.origin());
 196     init_package.copy_filter(package);
 197
 198     mp::odr odr;
 199
 200     Z_APDU *init_apdu = zget_APDU(odr, Z_APDU_initRequest);
 201
 202     mp::util::set_vhost_otherinfo(&init_apdu->u.initRequest->otherInfo, odr,
 203                                    b->m_targets);
 204     Z_InitRequest *req = init_apdu->u.initRequest;
 205
 206     // copy stuff from Frontend Init Request
 207     Z_GDU *org_gdu = m_init_gdu.get();
 208     Z_InitRequest *org_init = org_gdu->u.z3950->u.initRequest;
 209
 210     req->idAuthentication = org_init->idAuthentication;
 211     req->implementationId = org_init->implementationId;
 212     req->implementationName = org_init->implementationName;
 213     req->implementationVersion = org_init->implementationVersion;
 214
 215     ODR_MASK_SET(req->options, Z_Options_search);
 216     ODR_MASK_SET(req->options, Z_Options_present);
 217     ODR_MASK_SET(req->options, Z_Options_namedResultSets);
 218     ODR_MASK_SET(req->options, Z_Options_scan);
 219
 220     ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_1);
 221     ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_2);
 222     ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_3);
 223
 224     init_package.request() = init_apdu;
 225
 226     init_package.move(b->m_route);  // sending init
 227
 228     Z_GDU *gdu = init_package.response().get();
 229     // we hope to get an init response
 230     if (gdu && gdu->which == Z_GDU_Z3950 && gdu->u.z3950->which ==
 231         Z_APDU_initResponse)
 232     {
 233         Z_InitResponse *res = gdu->u.z3950->u.initResponse;
 234         if (ODR_MASK_GET(res->options, Z_Options_namedResultSets))
 235         {
 236             b->m_named_result_sets = true;
 237         }
 238         if (*res->result)
 239         {
 240             m_backend_list.push_back(b);
 241             return b;
 242
 243         }
 244         error_code = YAZ_BIB1_DATABASE_UNAVAILABLE;
 245         mp::util::get_init_diagnostics(res, error_code, addinfo);
 246     }
 247     if (!init_package.session().is_closed())
 248     {
 249         Package close_package(b->m_backend_session, package.origin());
 250         close_package.copy_filter(package);
 251         close_package.session().close();
 252         close_package.move(b->m_route);  // closing it
 253     }
 254     BackendPtr null;
 255     return null;
 256 }
 257
 258 void yf::VirtualDB::Frontend::search(mp::Package &package, Z_APDU *apdu_req)
 259 {
 260     Z_SearchRequest *req = apdu_req->u.searchRequest;
 261     std::string vhost;
 262     std::string resultSetId = req->resultSetName;
 263     mp::odr odr;
 264
 265     std::list<std::string> databases;
 266     int i;
 267     for (i = 0; i<req->num_databaseNames; i++)
 268         databases.push_back(req->databaseNames[i]);
 269
 270     BackendPtr b; // null for now
 271     Sets_it sets_it = m_sets.find(req->resultSetName);
 272     if (sets_it != m_sets.end())
 273     {
 274         // result set already exist
 275         // if replace indicator is off: we return diagnostic if
 276         // result set already exist.
 277         if (*req->replaceIndicator == 0)
 278         {
 279             Z_APDU *apdu =
 280                 odr.create_searchResponse(
 281                     apdu_req,
 282                     YAZ_BIB1_RESULT_SET_EXISTS_AND_REPLACE_INDICATOR_OFF,
 283                     0);
 284             package.response() = apdu;
 285
 286             return;
 287         }
 288         sets_it->second.m_backend->m_number_of_sets--;
 289
 290         // pick up any existing backend with a database match
 291         std::list<BackendPtr>::const_iterator map_it;
 292         map_it = m_backend_list.begin();
 293         for (; map_it != m_backend_list.end(); map_it++)
 294         {
 295             BackendPtr tmp = *map_it;
 296             if (tmp->m_frontend_databases == databases &&
 297                 (tmp->m_named_result_sets ||
 298                  tmp->m_number_of_sets == 0))
 299                 break;
 300         }
 301         if (map_it != m_backend_list.end())
 302             b = *map_it;
 303     }
 304     else
 305     {
 306         // new result set.
 307
 308         // pick up any existing database with named result sets ..
 309         // or one which has no result sets.. yet.
 310         std::list<BackendPtr>::const_iterator map_it;
 311         map_it = m_backend_list.begin();
 312         for (; map_it != m_backend_list.end(); map_it++)
 313         {
 314             BackendPtr tmp = *map_it;
 315             if (tmp->m_frontend_databases == databases &&
 316                 (tmp->m_named_result_sets ||
 317                  tmp->m_number_of_sets == 0))
 318                 break;
 319         }
 320         if (map_it != m_backend_list.end())
 321             b = *map_it;
 322     }
 323     if (!b)  // no backend yet. Must create a new one
 324     {
 325         int error_code;
 326         std::string addinfo;
 327         b = init_backend(databases, package, error_code, addinfo);
 328         if (!b)
 329         {
 330             // did not get a backend (unavailable somehow?)
 331
 332             Z_APDU *apdu =
 333                 odr.create_searchResponse(
 334                     apdu_req, error_code, addinfo.c_str());
 335             package.response() = apdu;
 336             return;
 337         }
 338     }
 339     m_sets.erase(req->resultSetName);
 340     // sending search to backend
 341     Package search_package(b->m_backend_session, package.origin());
 342
 343     search_package.copy_filter(package);
 344
 345     std::string backend_setname;
 346     if (b->m_named_result_sets)
 347     {
 348         backend_setname = std::string(req->resultSetName);
 349     }
 350     else
 351     {
 352         backend_setname = "default";
 353         req->resultSetName = odr_strdup(odr, backend_setname.c_str());
 354     }
 355
 356     // pick first targets spec and move the databases from it ..
 357     std::list<std::string>::const_iterator t_it = b->m_targets.begin();
 358     if (t_it != b->m_targets.end())
 359     {
 360         mp::util::set_databases_from_zurl(odr, *t_it,
 361                                                 &req->num_databaseNames,
 362                                                 &req->databaseNames);
 363     }
 364
 365     *req->replaceIndicator = 1;
 366
 367     search_package.request() = yazpp_1::GDU(apdu_req);
 368
 369     search_package.move(b->m_route);
 370
 371     if (search_package.session().is_closed())
 372     {
 373         package.response() = search_package.response();
 374         package.session().close();
 375         return;
 376     }
 377     b->m_number_of_sets++;
 378
 379     m_sets[resultSetId] = VirtualDB::Set(b, backend_setname);
 380     fixup_package(search_package, b);
 381     package.response() = search_package.response();
 382 }
 383
 384 yf::VirtualDB::Frontend::Frontend(Rep *rep)
 385 {
 386     m_p = rep;
 387     m_is_virtual = false;
 388 }
 389
 390 void yf::VirtualDB::Frontend::close(mp::Package &package)
 391 {
 392     std::list<BackendPtr>::const_iterator b_it;
 393
 394     for (b_it = m_backend_list.begin(); b_it != m_backend_list.end(); b_it++)
 395     {
 396         (*b_it)->m_backend_session.close();
 397         Package close_package((*b_it)->m_backend_session, package.origin());
 398         close_package.copy_filter(package);
 399         close_package.move((*b_it)->m_route);
 400     }
 401     m_backend_list.clear();
 402 }
 403
 404 yf::VirtualDB::Frontend::~Frontend()
 405 {
 406 }
 407
 408 yf::VirtualDB::FrontendPtr yf::VirtualDB::Rep::get_frontend(mp::Package &package)
 409 {
 410     boost::mutex::scoped_lock lock(m_mutex);
 411
 412     std::map<mp::Session,yf::VirtualDB::FrontendPtr>::iterator it;
 413
 414     while(true)
 415     {
 416         it = m_clients.find(package.session());
 417         if (it == m_clients.end())
 418             break;
 419
 420         if (!it->second->m_in_use)
 421         {
 422             it->second->m_in_use = true;
 423             return it->second;
 424         }
 425         m_cond_session_ready.wait(lock);
 426     }
 427     FrontendPtr f(new Frontend(this));
 428     m_clients[package.session()] = f;
 429     f->m_in_use = true;
 430     return f;
 431 }
 432
 433 void yf::VirtualDB::Rep::release_frontend(mp::Package &package)
 434 {
 435     boost::mutex::scoped_lock lock(m_mutex);
 436     std::map<mp::Session,yf::VirtualDB::FrontendPtr>::iterator it;
 437
 438     it = m_clients.find(package.session());
 439     if (it != m_clients.end())
 440     {
 441         if (package.session().is_closed())
 442         {
 443             it->second->close(package);
 444             m_clients.erase(it);
 445         }
 446         else
 447         {
 448             it->second->m_in_use = false;
 449         }
 450         m_cond_session_ready.notify_all();
 451     }
 452 }
 453
 454 yf::VirtualDB::Set::Set(BackendPtr b, std::string setname)
 455     :  m_backend(b), m_setname(setname)
 456 {
 457 }
 458
 459
 460 yf::VirtualDB::Set::Set()
 461 {
 462 }
 463
 464
 465 yf::VirtualDB::Set::~Set()
 466 {
 467 }
 468
 469 yf::VirtualDB::Map::Map(std::string database,
 470                         std::list<std::string> targets, std::string route)
 471     : m_dbpattern(database), m_targets(targets), m_route(route)
 472 {
 473 }
 474
 475 yf::VirtualDB::Map::Map()
 476 {
 477 }
 478
 479 bool yf::VirtualDB::Map::match(const std::string db) const
 480 {
 481     std::string norm_db = mp::util::database_name_normalize(db);
 482     if (yaz_match_glob(m_dbpattern.c_str(), norm_db.c_str()))
 483         return true;
 484     return false;
 485 }
 486
 487 yf::VirtualDB::VirtualDB() : m_p(new VirtualDB::Rep)
 488 {
 489     m_p->pass_vhosts = false;
 490 }
 491
 492 yf::VirtualDB::~VirtualDB() {
 493 }
 494
 495 void yf::VirtualDB::Frontend::fixup_npr_record(ODR odr, Z_NamePlusRecord *npr,
 496                                              BackendPtr b)
 497 {
 498     if (npr->databaseName)
 499     {
 500         std::string b_database = std::string(npr->databaseName);
 501
 502         // consider each of the frontend databases..
 503         std::list<std::string>::const_iterator db_it;
 504         for (db_it = b->m_frontend_databases.begin();
 505              db_it != b->m_frontend_databases.end(); db_it++)
 506         {
 507             // see which target it corresponds to.. (if any)
 508             std::list<VirtualDB::Map>::const_iterator map_it =
 509                 m_p->m_maps.begin();
 510             while (map_it != m_p->m_maps.end())
 511             {
 512                 if (map_it->match(*db_it))
 513                     break;
 514                 map_it++;
 515             }
 516             if (map_it != m_p->m_maps.end())
 517             {
 518                 std::list<std::string>::const_iterator t
 519                     = map_it->m_targets.begin();
 520                 while (t != map_it->m_targets.end())
 521                 {
 522                     if (*t == b_database)
 523                     {
 524                         npr->databaseName = odr_strdup(odr, (*db_it).c_str());
 525                         return;
 526                     }
 527                     t++;
 528                 }
 529             }
 530
 531         }
 532         db_it = b->m_frontend_databases.begin();
 533         if (db_it != b->m_frontend_databases.end())
 534         {
 535             std::string database = *db_it;
 536             npr->databaseName = odr_strdup(odr, database.c_str());
 537         }
 538     }
 539 }
 540
 541 void yf::VirtualDB::Frontend::fixup_npr_records(ODR odr, Z_Records *records,
 542                                               BackendPtr b)
 543 {
 544     if (records && records->which == Z_Records_DBOSD)
 545     {
 546         Z_NamePlusRecordList *nprlist = records->u.databaseOrSurDiagnostics;
 547         int i;
 548         for (i = 0; i < nprlist->num_records; i++)
 549         {
 550             fixup_npr_record(odr, nprlist->records[i], b);
 551         }
 552     }
 553 }
 554
 555 void yf::VirtualDB::Frontend::fixup_package(mp::Package &p, BackendPtr b)
 556 {
 557     Z_GDU *gdu = p.response().get();
 558     mp::odr odr;
 559
 560     if (gdu && gdu->which == Z_GDU_Z3950)
 561     {
 562         Z_APDU *apdu = gdu->u.z3950;
 563         if (apdu->which == Z_APDU_presentResponse)
 564         {
 565             fixup_npr_records(odr, apdu->u.presentResponse->records, b);
 566             p.response() = gdu;
 567         }
 568         else if (apdu->which == Z_APDU_searchResponse)
 569         {
 570             fixup_npr_records(odr,  apdu->u.searchResponse->records, b);
 571             p.response() = gdu;
 572         }
 573     }
 574 }
 575
 576 void yf::VirtualDB::Frontend::present(mp::Package &package, Z_APDU *apdu_req)
 577 {
 578     Z_PresentRequest *req = apdu_req->u.presentRequest;
 579     std::string resultSetId = req->resultSetId;
 580     mp::odr odr;
 581
 582     Sets_it sets_it = m_sets.find(resultSetId);
 583     if (sets_it == m_sets.end())
 584     {
 585         Z_APDU *apdu =
 586             odr.create_presentResponse(
 587                 apdu_req,
 588                 YAZ_BIB1_SPECIFIED_RESULT_SET_DOES_NOT_EXIST,
 589                 resultSetId.c_str());
 590         package.response() = apdu;
 591         return;
 592     }
 593     Session *id =
 594         new mp::Session(sets_it->second.m_backend->m_backend_session);
 595
 596     // sending present to backend
 597     Package present_package(*id, package.origin());
 598     present_package.copy_filter(package);
 599
 600     req->resultSetId = odr_strdup(odr, sets_it->second.m_setname.c_str());
 601
 602     present_package.request() = yazpp_1::GDU(apdu_req);
 603
 604     present_package.move(sets_it->second.m_backend->m_route);
 605
 606     fixup_package(present_package, sets_it->second.m_backend);
 607
 608     if (present_package.session().is_closed())
 609     {
 610         package.response() = present_package.response();
 611         package.session().close();
 612         return;
 613     }
 614     else
 615     {
 616         package.response() = present_package.response();
 617     }
 618     delete id;
 619 }
 620
 621 void yf::VirtualDB::Frontend::scan(mp::Package &package, Z_APDU *apdu_req)
 622 {
 623     Z_ScanRequest *req = apdu_req->u.scanRequest;
 624     std::string vhost;
 625     mp::odr odr;
 626
 627     std::list<std::string> databases;
 628     int i;
 629     for (i = 0; i<req->num_databaseNames; i++)
 630         databases.push_back(req->databaseNames[i]);
 631
 632     BackendPtr b;
 633     // pick up any existing backend with a database match
 634     std::list<BackendPtr>::const_iterator map_it;
 635     map_it = m_backend_list.begin();
 636     for (; map_it != m_backend_list.end(); map_it++)
 637     {
 638         BackendPtr tmp = *map_it;
 639         if (tmp->m_frontend_databases == databases)
 640             break;
 641     }
 642     if (map_it != m_backend_list.end())
 643         b = *map_it;
 644     if (!b)  // no backend yet. Must create a new one
 645     {
 646         int error_code;
 647         std::string addinfo;
 648         b = init_backend(databases, package, error_code, addinfo);
 649         if (!b)
 650         {
 651             // did not get a backend (unavailable somehow?)
 652             Z_APDU *apdu =
 653                 odr.create_scanResponse(
 654                     apdu_req, error_code, addinfo.c_str());
 655             package.response() = apdu;
 656
 657             return;
 658         }
 659     }
 660     // sending scan to backend
 661     Package scan_package(b->m_backend_session, package.origin());
 662
 663     scan_package.copy_filter(package);
 664
 665     // pick first targets spec and move the databases from it ..
 666     std::list<std::string>::const_iterator t_it = b->m_targets.begin();
 667     if (t_it != b->m_targets.end())
 668     {
 669         mp::util::set_databases_from_zurl(odr, *t_it,
 670                                                 &req->num_databaseNames,
 671                                                 &req->databaseNames);
 672     }
 673     scan_package.request() = yazpp_1::GDU(apdu_req);
 674
 675     scan_package.move(b->m_route);
 676
 677     if (scan_package.session().is_closed())
 678     {
 679         package.response() = scan_package.response();
 680         package.session().close();
 681         return;
 682     }
 683     package.response() = scan_package.response();
 684 }
 685
 686
 687 void yf::VirtualDB::add_map_db2targets(std::string db,
 688                                      std::list<std::string> targets,
 689                                      std::string route)
 690 {
 691     m_p->m_maps.push_back(
 692         VirtualDB::Map(mp::util::database_name_normalize(db), targets, route));
 693 }
 694
 695
 696 void yf::VirtualDB::add_map_db2target(std::string db,
 697                                     std::string target,
 698                                     std::string route)
 699 {
 700     std::list<std::string> targets;
 701     targets.push_back(target);
 702
 703     add_map_db2targets(db, targets, route);
 704 }
 705
 706 void yf::VirtualDB::process(mp::Package &package) const
 707 {
 708     FrontendPtr f = m_p->get_frontend(package);
 709
 710     Z_GDU *gdu = package.request().get();
 711
 712     if (gdu && gdu->which == Z_GDU_Z3950 && gdu->u.z3950->which ==
 713         Z_APDU_initRequest && !f->m_is_virtual)
 714     {
 715         Z_InitRequest *req = gdu->u.z3950->u.initRequest;
 716
 717         std::list<std::string> vhosts;
 718         mp::util::get_vhost_otherinfo(req->otherInfo, vhosts);
 719
 720         if (vhosts.size() > 0 && m_p->pass_vhosts)
 721         {
 722             package.move();
 723         }
 724         else
 725         {
 726             f->m_init_gdu = gdu;
 727
 728             mp::odr odr;
 729             Z_APDU *apdu = odr.create_initResponse(gdu->u.z3950, 0, 0);
 730             Z_InitResponse *resp = apdu->u.initResponse;
 731
 732             int i;
 733             static const int masks[] = {
 734                 Z_Options_search,
 735                 Z_Options_present,
 736                 Z_Options_namedResultSets,
 737                 Z_Options_scan,
 738                 -1
 739             };
 740             for (i = 0; masks[i] != -1; i++)
 741                 if (ODR_MASK_GET(req->options, masks[i]))
 742                     ODR_MASK_SET(resp->options, masks[i]);
 743
 744             static const int versions[] = {
 745                 Z_ProtocolVersion_1,
 746                 Z_ProtocolVersion_2,
 747                 Z_ProtocolVersion_3,
 748                 -1
 749             };
 750             for (i = 0; versions[i] != -1; i++)
 751                 if (ODR_MASK_GET(req->protocolVersion, versions[i]))
 752                     ODR_MASK_SET(resp->protocolVersion, versions[i]);
 753                 else
 754                     break;
 755
 756             package.response() = apdu;
 757             f->m_is_virtual = true;
 758         }
 759     }
 760     else if (!f->m_is_virtual)
 761         package.move();
 762     else if (gdu && gdu->which == Z_GDU_Z3950)
 763     {
 764         Z_APDU *apdu = gdu->u.z3950;
 765         if (apdu->which == Z_APDU_initRequest)
 766         {
 767             mp::odr odr;
 768
 769             package.response() = odr.create_close(
 770                 apdu,
 771                 Z_Close_protocolError,
 772                 "double init");
 773
 774             package.session().close();
 775         }
 776         else if (apdu->which == Z_APDU_searchRequest)
 777         {
 778             f->search(package, apdu);
 779         }
 780         else if (apdu->which == Z_APDU_presentRequest)
 781         {
 782             f->present(package, apdu);
 783         }
 784         else if (apdu->which == Z_APDU_scanRequest)
 785         {
 786             f->scan(package, apdu);
 787         }
 788         else if (apdu->which == Z_APDU_close)
 789         {
 790             package.session().close();
 791         }
 792         else
 793         {
 794             mp::odr odr;
 795
 796             package.response() = odr.create_close(
 797                 apdu, Z_Close_protocolError,
 798                 "unsupported APDU in filter_virt_db");
 799
 800             package.session().close();
 801         }
 802     }
 803     m_p->release_frontend(package);
 804 }
 805
 806
 807 void mp::filter::VirtualDB::configure(const xmlNode * ptr, bool test_only)
 808 {
 809     for (ptr = ptr->children; ptr; ptr = ptr->next)
 810     {
 811         if (ptr->type != XML_ELEMENT_NODE)
 812             continue;
 813         if (!strcmp((const char *) ptr->name, "pass-vhosts"))
 814         {
 815             m_p->pass_vhosts = mp::xml::get_bool(ptr->children, false);
 816         }
 817         else if (!strcmp((const char *) ptr->name, "virtual"))
 818         {
 819             std::string database;
 820             std::list<std::string> targets;
 821             xmlNode *v_node = ptr->children;
 822             for (; v_node; v_node = v_node->next)
 823             {
 824                 if (v_node->type != XML_ELEMENT_NODE)
 825                     continue;
 826
 827                 if (mp::xml::is_element_mp(v_node, "database"))
 828                     database = mp::xml::get_text(v_node);
 829                 else if (mp::xml::is_element_mp(v_node, "target"))
 830                     targets.push_back(mp::xml::get_text(v_node));
 831                 else
 832                     throw mp::filter::FilterException
 833                         ("Bad element "
 834                          + std::string((const char *) v_node->name)
 835                          + " in virtual section"
 836                             );
 837             }
 838             std::string route = mp::xml::get_route(ptr);
 839             add_map_db2targets(database, targets, route);
 840         }
 841         else
 842         {
 843             throw mp::filter::FilterException
 844                 ("Bad element "
 845                  + std::string((const char *) ptr->name)
 846                  + " in virt_db filter");
 847         }
 848     }
 849 }
 850
 851 static mp::filter::Base* filter_creator()
 852 {
 853     return new mp::filter::VirtualDB;
 854 }
 855
 856 extern "C" {
 857     struct metaproxy_1_filter_struct metaproxy_1_filter_virt_db = {
 858         0,
 859         "virt_db",
 860         filter_creator
 861     };
 862 }
 863
 864
 865 /*
 866  * Local variables:
 867  * c-basic-offset: 4
 868  * c-file-style: "Stroustrup"
 869  * indent-tabs-mode: nil
 870  * End:
 871  * vim: shiftwidth=4 tabstop=8 expandtab
 872  */
 873