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