src/filter_virt_db.cpp

   1 /* $Id: filter_virt_db.cpp,v 1.32 2006-01-18 10:30:28 adam Exp $
   2    Copyright (c) 2005, Index Data.
   3
   4 %LICENSE%
   5  */
   6
   7 #include "config.hpp"
   8
   9 #include "filter.hpp"
  10 #include "package.hpp"
  11
  12 #include <boost/thread/mutex.hpp>
  13 #include <boost/thread/condition.hpp>
  14 #include <boost/shared_ptr.hpp>
  15
  16 #include "util.hpp"
  17 #include "filter_virt_db.hpp"
  18
  19 #include <yaz/zgdu.h>
  20 #include <yaz/otherinfo.h>
  21 #include <yaz/diagbib1.h>
  22
  23 #include <map>
  24 #include <iostream>
  25
  26 namespace yf = yp2::filter;
  27
  28 namespace yp2 {
  29     namespace filter {
  30
  31         struct Virt_db::Set {
  32             Set(BackendPtr b, std::string setname);
  33             Set();
  34             ~Set();
  35
  36             BackendPtr m_backend;
  37             std::string m_setname;
  38         };
  39         struct Virt_db::Map {
  40             Map(std::list<std::string> targets, std::string route);
  41             Map();
  42             std::list<std::string> m_targets;
  43             std::string m_route;
  44         };
  45         struct Virt_db::Backend {
  46             yp2::Session m_backend_session;
  47             std::list<std::string> m_frontend_databases;
  48             std::list<std::string> m_targets;
  49             std::string m_route;
  50             bool m_named_result_sets;
  51             int m_number_of_sets;
  52         };
  53         struct Virt_db::Frontend {
  54             Frontend(Rep *rep);
  55             ~Frontend();
  56             yp2::Session m_session;
  57             bool m_is_virtual;
  58             bool m_in_use;
  59             yazpp_1::GDU m_init_gdu;
  60             std::list<BackendPtr> m_backend_list;
  61             std::map<std::string,Virt_db::Set> m_sets;
  62
  63             void search(Package &package, Z_APDU *apdu);
  64             void present(Package &package, Z_APDU *apdu);
  65             void scan(Package &package, Z_APDU *apdu);
  66
  67             void close(Package &package);
  68             typedef std::map<std::string,Virt_db::Set>::iterator Sets_it;
  69
  70             BackendPtr lookup_backend_from_databases(
  71                 std::list<std::string> databases);
  72             BackendPtr create_backend_from_databases(
  73                 std::list<std::string> databases,
  74                 int &error_code,
  75                 std::string &failing_database);
  76
  77             BackendPtr init_backend(std::list<std::string> database,
  78                                     Package &package,
  79                                     int &error_code, std::string &addinfo);
  80             Rep *m_p;
  81         };
  82         class Virt_db::Rep {
  83             friend class Virt_db;
  84             friend class Frontend;
  85
  86             FrontendPtr get_frontend(Package &package);
  87             void release_frontend(Package &package);
  88         private:
  89             boost::mutex m_sessions_mutex;
  90             std::map<std::string, Virt_db::Map>m_maps;
  91
  92             typedef std::map<std::string,Virt_db::Set>::iterator Sets_it;
  93
  94             boost::mutex m_mutex;
  95             boost::condition m_cond_session_ready;
  96             std::map<yp2::Session, FrontendPtr> m_clients;
  97         };
  98     }
  99 }
 100
 101 using namespace yp2;
 102
 103 yf::Virt_db::BackendPtr yf::Virt_db::Frontend::lookup_backend_from_databases(
 104     std::list<std::string> databases)
 105 {
 106     std::list<BackendPtr>::const_iterator map_it;
 107     map_it = m_backend_list.begin();
 108     for (; map_it != m_backend_list.end(); map_it++)
 109         if ((*map_it)->m_frontend_databases == databases)
 110             return *map_it;
 111     BackendPtr null;
 112     return null;
 113 }
 114
 115 yf::Virt_db::BackendPtr yf::Virt_db::Frontend::create_backend_from_databases(
 116     std::list<std::string> databases, int &error_code, std::string &addinfo)
 117 {
 118     BackendPtr b(new Backend);
 119     std::list<std::string>::const_iterator db_it = databases.begin();
 120
 121     b->m_number_of_sets = 0;
 122     b->m_frontend_databases = databases;
 123     b->m_named_result_sets = false;
 124
 125     bool first_route = true;
 126
 127     std::map<std::string,bool> targets_dedup;
 128     for (; db_it != databases.end(); db_it++)
 129     {
 130         std::map<std::string, Virt_db::Map>::iterator map_it;
 131         map_it = m_p->m_maps.find(*db_it);
 132         if (map_it == m_p->m_maps.end())  // database not found
 133         {
 134             error_code = YAZ_BIB1_DATABASE_UNAVAILABLE;
 135             addinfo = *db_it;
 136             BackendPtr ptr;
 137             return ptr;
 138         }
 139         std::list<std::string>::const_iterator t_it =
 140             map_it->second.m_targets.begin();
 141         for (; t_it != map_it->second.m_targets.end(); t_it++)
 142             targets_dedup[*t_it] = true;
 143
 144         // see if we have a route conflict.
 145         if (!first_route && b->m_route != map_it->second.m_route)
 146         {
 147             // we have a conflict..
 148             error_code =  YAZ_BIB1_COMBI_OF_SPECIFIED_DATABASES_UNSUPP;
 149             BackendPtr ptr;
 150             return ptr;
 151         }
 152         b->m_route = map_it->second.m_route;
 153         first_route = false;
 154     }
 155     std::map<std::string,bool>::const_iterator tm_it = targets_dedup.begin();
 156     for (; tm_it != targets_dedup.end(); tm_it++)
 157         b->m_targets.push_back(tm_it->first);
 158
 159     return b;
 160 }
 161
 162 yf::Virt_db::BackendPtr yf::Virt_db::Frontend::init_backend(
 163     std::list<std::string> databases, Package &package,
 164     int &error_code, std::string &addinfo)
 165 {
 166     BackendPtr b = create_backend_from_databases(databases, error_code,
 167                                                  addinfo);
 168     if (!b)
 169         return b;
 170     Package init_package(b->m_backend_session, package.origin());
 171     init_package.copy_filter(package);
 172
 173     yp2::odr odr;
 174
 175     Z_APDU *init_apdu = zget_APDU(odr, Z_APDU_initRequest);
 176
 177     std::list<std::string>::const_iterator t_it = b->m_targets.begin();
 178     int cat = 1;
 179     for (; t_it != b->m_targets.end(); t_it++, cat++)
 180     {
 181         yaz_oi_set_string_oidval(&init_apdu->u.initRequest->otherInfo, odr,
 182                                  VAL_PROXY, cat, t_it->c_str());
 183     }
 184
 185     Z_InitRequest *req = init_apdu->u.initRequest;
 186
 187     // copy stuff from Frontend Init Request
 188     Z_GDU *org_gdu = m_init_gdu.get();
 189     Z_InitRequest *org_init = org_gdu->u.z3950->u.initRequest;
 190
 191     req->idAuthentication = org_init->idAuthentication;
 192     req->implementationId = org_init->implementationId;
 193     req->implementationName = org_init->implementationName;
 194     req->implementationVersion = org_init->implementationVersion;
 195
 196     ODR_MASK_SET(req->options, Z_Options_search);
 197     ODR_MASK_SET(req->options, Z_Options_present);
 198     ODR_MASK_SET(req->options, Z_Options_namedResultSets);
 199     ODR_MASK_SET(req->options, Z_Options_scan);
 200
 201     ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_1);
 202     ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_2);
 203     ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_3);
 204
 205     init_package.request() = init_apdu;
 206
 207     init_package.move(b->m_route);  // sending init
 208
 209     Z_GDU *gdu = init_package.response().get();
 210     // we hope to get an init response
 211     if (gdu && gdu->which == Z_GDU_Z3950 && gdu->u.z3950->which ==
 212         Z_APDU_initResponse)
 213     {
 214         Z_InitResponse *res = gdu->u.z3950->u.initResponse;
 215         if (ODR_MASK_GET(res->options, Z_Options_namedResultSets))
 216         {
 217             b->m_named_result_sets = true;
 218         }
 219         std::cout << "GOT INIT res=" << *res->result << "\n";
 220         if (!*res->result)
 221         {
 222             yp2::util::get_init_diagnostics(res, error_code, addinfo);
 223             BackendPtr null;
 224             return null;
 225         }
 226     }
 227     else
 228     {
 229         error_code = YAZ_BIB1_DATABASE_UNAVAILABLE;
 230         // addinfo = database;
 231         BackendPtr null;
 232         return null;
 233     }
 234     if (init_package.session().is_closed())
 235     {
 236         error_code = YAZ_BIB1_DATABASE_UNAVAILABLE;
 237         // addinfo = database;
 238         BackendPtr null;
 239         return null;
 240     }
 241
 242     m_backend_list.push_back(b);
 243     return b;
 244 }
 245
 246 void yf::Virt_db::Frontend::search(Package &package, Z_APDU *apdu_req)
 247 {
 248     Z_SearchRequest *req = apdu_req->u.searchRequest;
 249     std::string vhost;
 250     std::string resultSetId = req->resultSetName;
 251     yp2::odr odr;
 252
 253     std::list<std::string> databases;
 254     int i;
 255     for (i = 0; i<req->num_databaseNames; i++)
 256         databases.push_back(req->databaseNames[i]);
 257
 258     BackendPtr b; // null for now
 259     Sets_it sets_it = m_sets.find(req->resultSetName);
 260     if (sets_it != m_sets.end())
 261     {
 262         // result set already exist
 263         // if replace indicator is off: we return diagnostic if
 264         // result set already exist.
 265         if (*req->replaceIndicator == 0)
 266         {
 267             Z_APDU *apdu =
 268                 odr.create_searchResponse(
 269                     apdu_req,
 270                     YAZ_BIB1_RESULT_SET_EXISTS_AND_REPLACE_INDICATOR_OFF,
 271                     0);
 272             package.response() = apdu;
 273
 274             return;
 275         }
 276         sets_it->second.m_backend->m_number_of_sets--;
 277
 278         // pick up any existing backend with a database match
 279         std::list<BackendPtr>::const_iterator map_it;
 280         map_it = m_backend_list.begin();
 281         for (; map_it != m_backend_list.end(); map_it++)
 282         {
 283             BackendPtr tmp = *map_it;
 284             if (tmp->m_frontend_databases == databases)
 285                 break;
 286         }
 287         if (map_it != m_backend_list.end())
 288             b = *map_it;
 289     }
 290     else
 291     {
 292         // new result set.
 293
 294         // pick up any existing database with named result sets ..
 295         // or one which has no result sets.. yet.
 296         std::list<BackendPtr>::const_iterator map_it;
 297         map_it = m_backend_list.begin();
 298         for (; map_it != m_backend_list.end(); map_it++)
 299         {
 300             BackendPtr tmp = *map_it;
 301             if (tmp->m_frontend_databases == databases &&
 302                 (tmp->m_named_result_sets ||
 303                  tmp->m_number_of_sets == 0))
 304                 break;
 305         }
 306         if (map_it != m_backend_list.end())
 307             b = *map_it;
 308     }
 309     if (!b)  // no backend yet. Must create a new one
 310     {
 311         int error_code;
 312         std::string addinfo;
 313         b = init_backend(databases, package, error_code, addinfo);
 314         if (!b)
 315         {
 316             // did not get a backend (unavailable somehow?)
 317
 318             Z_APDU *apdu =
 319                 odr.create_searchResponse(
 320                     apdu_req, error_code, addinfo.c_str());
 321             package.response() = apdu;
 322             return;
 323         }
 324     }
 325     m_sets.erase(req->resultSetName);
 326     // sending search to backend
 327     Package search_package(b->m_backend_session, package.origin());
 328
 329     search_package.copy_filter(package);
 330
 331     std::string backend_setname;
 332     if (b->m_named_result_sets)
 333     {
 334         backend_setname = std::string(req->resultSetName);
 335     }
 336     else
 337     {
 338         backend_setname = "default";
 339         req->resultSetName = odr_strdup(odr, backend_setname.c_str());
 340     }
 341
 342     // pick first targets spec and move the databases from it ..
 343     std::list<std::string>::const_iterator t_it = b->m_targets.begin();
 344     if (t_it != b->m_targets.end())
 345     {
 346         if (!yp2::util::set_databases_from_zurl(odr, *t_it,
 347                                                 &req->num_databaseNames,
 348                                                 &req->databaseNames));
 349     }
 350
 351     *req->replaceIndicator = 1;
 352
 353     search_package.request() = yazpp_1::GDU(apdu_req);
 354
 355     search_package.move(b->m_route);
 356
 357     if (search_package.session().is_closed())
 358     {
 359         package.response() = search_package.response();
 360         package.session().close();
 361         return;
 362     }
 363     package.response() = search_package.response();
 364
 365     b->m_number_of_sets++;
 366
 367     m_sets[resultSetId] = Virt_db::Set(b, backend_setname);
 368 }
 369
 370 yf::Virt_db::Frontend::Frontend(Rep *rep)
 371 {
 372     m_p = rep;
 373     m_is_virtual = false;
 374 }
 375
 376 void yf::Virt_db::Frontend::close(Package &package)
 377 {
 378     std::list<BackendPtr>::const_iterator b_it;
 379
 380     for (b_it = m_backend_list.begin(); b_it != m_backend_list.end(); b_it++)
 381     {
 382         (*b_it)->m_backend_session.close();
 383         Package close_package((*b_it)->m_backend_session, package.origin());
 384         close_package.copy_filter(package);
 385         close_package.move((*b_it)->m_route);
 386     }
 387     m_backend_list.clear();
 388 }
 389
 390 yf::Virt_db::Frontend::~Frontend()
 391 {
 392 }
 393
 394 yf::Virt_db::FrontendPtr yf::Virt_db::Rep::get_frontend(Package &package)
 395 {
 396     boost::mutex::scoped_lock lock(m_mutex);
 397
 398     std::map<yp2::Session,yf::Virt_db::FrontendPtr>::iterator it;
 399
 400     while(true)
 401     {
 402         it = m_clients.find(package.session());
 403         if (it == m_clients.end())
 404             break;
 405
 406         if (!it->second->m_in_use)
 407         {
 408             it->second->m_in_use = true;
 409             return it->second;
 410         }
 411         m_cond_session_ready.wait(lock);
 412     }
 413     FrontendPtr f(new Frontend(this));
 414     m_clients[package.session()] = f;
 415     f->m_in_use = true;
 416     return f;
 417 }
 418
 419 void yf::Virt_db::Rep::release_frontend(Package &package)
 420 {
 421     boost::mutex::scoped_lock lock(m_mutex);
 422     std::map<yp2::Session,yf::Virt_db::FrontendPtr>::iterator it;
 423
 424     it = m_clients.find(package.session());
 425     if (it != m_clients.end())
 426     {
 427         if (package.session().is_closed())
 428         {
 429             it->second->close(package);
 430             m_clients.erase(it);
 431         }
 432         else
 433         {
 434             it->second->m_in_use = false;
 435         }
 436         m_cond_session_ready.notify_all();
 437     }
 438 }
 439
 440 yf::Virt_db::Set::Set(BackendPtr b, std::string setname)
 441     :  m_backend(b), m_setname(setname)
 442 {
 443 }
 444
 445
 446 yf::Virt_db::Set::Set()
 447 {
 448 }
 449
 450
 451 yf::Virt_db::Set::~Set()
 452 {
 453 }
 454
 455 yf::Virt_db::Map::Map(std::list<std::string> targets, std::string route)
 456     : m_targets(targets), m_route(route)
 457 {
 458 }
 459
 460 yf::Virt_db::Map::Map()
 461 {
 462 }
 463
 464 yf::Virt_db::Virt_db() : m_p(new Virt_db::Rep)
 465 {
 466 }
 467
 468 yf::Virt_db::~Virt_db() {
 469 }
 470
 471 void yf::Virt_db::Frontend::present(Package &package, Z_APDU *apdu_req)
 472 {
 473     Z_PresentRequest *req = apdu_req->u.presentRequest;
 474     std::string resultSetId = req->resultSetId;
 475     yp2::odr odr;
 476
 477     Sets_it sets_it = m_sets.find(resultSetId);
 478     if (sets_it == m_sets.end())
 479     {
 480         Z_APDU *apdu =
 481             odr.create_presentResponse(
 482                 apdu_req,
 483                 YAZ_BIB1_SPECIFIED_RESULT_SET_DOES_NOT_EXIST,
 484                 resultSetId.c_str());
 485         package.response() = apdu;
 486         return;
 487     }
 488     Session *id =
 489         new yp2::Session(sets_it->second.m_backend->m_backend_session);
 490
 491     // sending present to backend
 492     Package present_package(*id, package.origin());
 493     present_package.copy_filter(package);
 494
 495     req->resultSetId = odr_strdup(odr, sets_it->second.m_setname.c_str());
 496
 497     present_package.request() = yazpp_1::GDU(apdu_req);
 498
 499     present_package.move(sets_it->second.m_backend->m_route);
 500
 501     if (present_package.session().is_closed())
 502     {
 503         package.response() = present_package.response();
 504         package.session().close();
 505         return;
 506     }
 507     else
 508     {
 509         package.response() = present_package.response();
 510     }
 511     delete id;
 512 }
 513
 514 void yf::Virt_db::Frontend::scan(Package &package, Z_APDU *apdu_req)
 515 {
 516     Z_ScanRequest *req = apdu_req->u.scanRequest;
 517     std::string vhost;
 518     yp2::odr odr;
 519
 520     std::list<std::string> databases;
 521     int i;
 522     for (i = 0; i<req->num_databaseNames; i++)
 523         databases.push_back(req->databaseNames[i]);
 524
 525     BackendPtr b;
 526     // pick up any existing backend with a database match
 527     std::list<BackendPtr>::const_iterator map_it;
 528     map_it = m_backend_list.begin();
 529     for (; map_it != m_backend_list.end(); map_it++)
 530     {
 531         BackendPtr tmp = *map_it;
 532         if (tmp->m_frontend_databases == databases)
 533             break;
 534     }
 535     if (map_it != m_backend_list.end())
 536         b = *map_it;
 537     if (!b)  // no backend yet. Must create a new one
 538     {
 539         int error_code;
 540         std::string addinfo;
 541         b = init_backend(databases, package, error_code, addinfo);
 542         if (!b)
 543         {
 544             // did not get a backend (unavailable somehow?)
 545             Z_APDU *apdu =
 546                 odr.create_scanResponse(
 547                     apdu_req, error_code, addinfo.c_str());
 548             package.response() = apdu;
 549
 550             return;
 551         }
 552     }
 553     // sending scan to backend
 554     Package scan_package(b->m_backend_session, package.origin());
 555
 556     scan_package.copy_filter(package);
 557
 558     // pick first targets spec and move the databases from it ..
 559     std::list<std::string>::const_iterator t_it = b->m_targets.begin();
 560     if (t_it != b->m_targets.end())
 561     {
 562         if (!yp2::util::set_databases_from_zurl(odr, *t_it,
 563                                                 &req->num_databaseNames,
 564                                                 &req->databaseNames));
 565     }
 566     scan_package.request() = yazpp_1::GDU(apdu_req);
 567
 568     scan_package.move(b->m_route);
 569
 570     if (scan_package.session().is_closed())
 571     {
 572         package.response() = scan_package.response();
 573         package.session().close();
 574         return;
 575     }
 576     package.response() = scan_package.response();
 577 }
 578
 579
 580 void yf::Virt_db::add_map_db2targets(std::string db,
 581                                      std::list<std::string> targets,
 582                                      std::string route)
 583 {
 584     m_p->m_maps[db] = Virt_db::Map(targets, route);
 585 }
 586
 587
 588 void yf::Virt_db::add_map_db2target(std::string db,
 589                                     std::string target,
 590                                     std::string route)
 591 {
 592     std::list<std::string> targets;
 593     targets.push_back(target);
 594
 595     m_p->m_maps[db] = Virt_db::Map(targets, route);
 596 }
 597
 598 void yf::Virt_db::process(Package &package) const
 599 {
 600     FrontendPtr f = m_p->get_frontend(package);
 601
 602     Z_GDU *gdu = package.request().get();
 603
 604     if (gdu && gdu->which == Z_GDU_Z3950 && gdu->u.z3950->which ==
 605         Z_APDU_initRequest && !f->m_is_virtual)
 606     {
 607         Z_InitRequest *req = gdu->u.z3950->u.initRequest;
 608
 609         const char *vhost =
 610             yaz_oi_get_string_oidval(&req->otherInfo, VAL_PROXY, 1, 0);
 611         if (!vhost)
 612         {
 613             f->m_init_gdu = gdu;
 614
 615             yp2::odr odr;
 616             Z_APDU *apdu = odr.create_initResponse(gdu->u.z3950, 0, 0);
 617             Z_InitResponse *resp = apdu->u.initResponse;
 618
 619             int i;
 620             static const int masks[] = {
 621                 Z_Options_search,
 622                 Z_Options_present,
 623                 Z_Options_namedResultSets,
 624                 Z_Options_scan,
 625                 -1
 626             };
 627             for (i = 0; masks[i] != -1; i++)
 628                 if (ODR_MASK_GET(req->options, masks[i]))
 629                     ODR_MASK_SET(resp->options, masks[i]);
 630
 631             static const int versions[] = {
 632                 Z_ProtocolVersion_1,
 633                 Z_ProtocolVersion_2,
 634                 Z_ProtocolVersion_3,
 635                 -1
 636             };
 637             for (i = 0; versions[i] != -1; i++)
 638                 if (ODR_MASK_GET(req->protocolVersion, versions[i]))
 639                     ODR_MASK_SET(resp->protocolVersion, versions[i]);
 640                 else
 641                     break;
 642
 643             package.response() = apdu;
 644             f->m_is_virtual = true;
 645         }
 646         else
 647             package.move();
 648     }
 649     else if (!f->m_is_virtual)
 650         package.move();
 651     else if (gdu && gdu->which == Z_GDU_Z3950)
 652     {
 653         Z_APDU *apdu = gdu->u.z3950;
 654         if (apdu->which == Z_APDU_initRequest)
 655         {
 656             yp2::odr odr;
 657
 658             package.response() = odr.create_close(
 659                 apdu,
 660                 Z_Close_protocolError,
 661                 "double init");
 662
 663             package.session().close();
 664         }
 665         else if (apdu->which == Z_APDU_searchRequest)
 666         {
 667             f->search(package, apdu);
 668         }
 669         else if (apdu->which == Z_APDU_presentRequest)
 670         {
 671             f->present(package, apdu);
 672         }
 673         else if (apdu->which == Z_APDU_scanRequest)
 674         {
 675             f->scan(package, apdu);
 676         }
 677         else
 678         {
 679             yp2::odr odr;
 680
 681             package.response() = odr.create_close(
 682                 apdu, Z_Close_protocolError,
 683                 "unsupported APDU in filter_virt_db");
 684
 685             package.session().close();
 686         }
 687     }
 688     m_p->release_frontend(package);
 689 }
 690
 691
 692 void yp2::filter::Virt_db::configure(const xmlNode * ptr)
 693 {
 694     for (ptr = ptr->children; ptr; ptr = ptr->next)
 695     {
 696         if (ptr->type != XML_ELEMENT_NODE)
 697             continue;
 698         if (!strcmp((const char *) ptr->name, "virtual"))
 699         {
 700             std::string database;
 701             std::list<std::string> targets;
 702             xmlNode *v_node = ptr->children;
 703             for (; v_node; v_node = v_node->next)
 704             {
 705                 if (v_node->type != XML_ELEMENT_NODE)
 706                     continue;
 707
 708                 if (yp2::xml::is_element_yp2(v_node, "database"))
 709                     database = yp2::xml::get_text(v_node);
 710                 else if (yp2::xml::is_element_yp2(v_node, "target"))
 711                     targets.push_back(yp2::xml::get_text(v_node));
 712                 else
 713                     throw yp2::filter::FilterException
 714                         ("Bad element "
 715                          + std::string((const char *) v_node->name)
 716                          + " in virtual section"
 717                             );
 718             }
 719             std::string route = yp2::xml::get_route(ptr);
 720             add_map_db2targets(database, targets, route);
 721         }
 722         else
 723         {
 724             throw yp2::filter::FilterException
 725                 ("Bad element "
 726                  + std::string((const char *) ptr->name)
 727                  + " in virt_db filter");
 728         }
 729     }
 730 }
 731
 732 static yp2::filter::Base* filter_creator()
 733 {
 734     return new yp2::filter::Virt_db;
 735 }
 736
 737 extern "C" {
 738     struct yp2_filter_struct yp2_filter_virt_db = {
 739         0,
 740         "virt_db",
 741         filter_creator
 742     };
 743 }
 744
 745
 746 /*
 747  * Local variables:
 748  * c-basic-offset: 4
 749  * indent-tabs-mode: nil
 750  * c-file-style: "stroustrup"
 751  * End:
 752  * vim: shiftwidth=4 tabstop=8 expandtab
 753  */