src/filter_virt_db.cpp

   1 /* This file is part of Metaproxy.
   2    Copyright (C) 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 #include <yaz/log.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(std::string database, std::string target, std::string route);
  56             Map();
  57             bool match(const std::string db) const;
  58             std::string m_dbpattern;
  59             std::list<std::string> m_targets;
  60             std::string m_route;
  61         };
  62         struct VirtualDB::Backend {
  63             mp::Session m_backend_session;
  64             std::list<std::string> m_frontend_databases;
  65             std::list<std::string> m_targets;
  66             std::string m_route;
  67             bool m_named_result_sets;
  68             int m_number_of_sets;
  69         };
  70         struct VirtualDB::Frontend {
  71             Frontend(Rep *rep);
  72             ~Frontend();
  73             mp::Session m_session;
  74             bool m_is_virtual;
  75             bool m_in_use;
  76             yazpp_1::GDU m_init_gdu;
  77             std::list<BackendPtr> m_backend_list;
  78             std::map<std::string,VirtualDB::Set> m_sets;
  79
  80             void search(Package &package, Z_APDU *apdu);
  81             void present(Package &package, Z_APDU *apdu);
  82             void scan(Package &package, Z_APDU *apdu);
  83             int relay_apdu(Package &package, Z_APDU *apdu);
  84
  85             void close(Package &package);
  86             typedef std::map<std::string,VirtualDB::Set>::iterator Sets_it;
  87
  88             void fixup_package(Package &p, BackendPtr b);
  89             void fixup_npr_record(ODR odr, Z_NamePlusRecord *npr,
  90                                   BackendPtr b);
  91             void fixup_npr_records(ODR odr, Z_Records *records,
  92                                    BackendPtr b);
  93
  94             BackendPtr lookup_backend_from_databases(
  95                 std::list<std::string> databases);
  96             BackendPtr create_backend_from_databases(
  97                 std::list<std::string> databases,
  98                 int &error_code,
  99                 std::string &failing_database);
 100
 101             BackendPtr init_backend(std::list<std::string> database,
 102                                     Package &package,
 103                                     int &error_code, std::string &addinfo);
 104             Rep *m_p;
 105         };
 106         class VirtualDB::Rep {
 107             friend class VirtualDB;
 108             friend struct Frontend;
 109
 110             FrontendPtr get_frontend(Package &package);
 111             void release_frontend(Package &package);
 112             void refresh_torus();
 113         private:
 114             std::list<VirtualDB::Map>m_maps;
 115             typedef std::map<std::string,VirtualDB::Set>::iterator Sets_it;
 116             boost::mutex m_mutex;
 117             boost::condition m_cond_session_ready;
 118             std::map<mp::Session, FrontendPtr> m_clients;
 119             bool pass_vhosts;
 120         };
 121     }
 122 }
 123
 124 yf::VirtualDB::BackendPtr yf::VirtualDB::Frontend::lookup_backend_from_databases(
 125     std::list<std::string> databases)
 126 {
 127     std::list<BackendPtr>::const_iterator map_it;
 128     map_it = m_backend_list.begin();
 129     for (; map_it != m_backend_list.end(); map_it++)
 130         if ((*map_it)->m_frontend_databases == databases)
 131             return *map_it;
 132     BackendPtr null;
 133     return null;
 134 }
 135
 136 yf::VirtualDB::BackendPtr yf::VirtualDB::Frontend::create_backend_from_databases(
 137     std::list<std::string> databases, int &error_code, std::string &addinfo)
 138 {
 139     BackendPtr b(new Backend);
 140     std::list<std::string>::const_iterator db_it = databases.begin();
 141
 142     b->m_number_of_sets = 0;
 143     b->m_frontend_databases = databases;
 144     b->m_named_result_sets = false;
 145
 146     bool first_route = true;
 147
 148     std::map<std::string,bool> targets_dedup;
 149     for (; db_it != databases.end(); db_it++)
 150     {
 151         std::list<VirtualDB::Map>::const_iterator map_it;
 152         map_it = m_p->m_maps.begin();
 153         while (map_it != m_p->m_maps.end())
 154         {
 155             if (map_it->match(*db_it))
 156                 break;
 157             map_it++;
 158         }
 159
 160         if (map_it == m_p->m_maps.end())  // database not found
 161         {
 162             error_code = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
 163             addinfo = *db_it;
 164             BackendPtr ptr;
 165             return ptr;
 166         }
 167         std::list<std::string>::const_iterator t_it =
 168             map_it->m_targets.begin();
 169         for (; t_it != map_it->m_targets.end(); t_it++) {
 170             if (!targets_dedup[*t_it])
 171             {
 172                 targets_dedup[*t_it] = true;
 173                 b->m_targets.push_back(*t_it);
 174             }
 175         }
 176
 177         // see if we have a route conflict.
 178         if (!first_route && b->m_route != map_it->m_route)
 179         {
 180             // we have a conflict.. routing must be same for all
 181             error_code =  YAZ_BIB1_COMBI_OF_SPECIFIED_DATABASES_UNSUPP;
 182             BackendPtr ptr;
 183             return ptr;
 184         }
 185         b->m_route = map_it->m_route;
 186         first_route = false;
 187     }
 188     return b;
 189 }
 190
 191 yf::VirtualDB::BackendPtr yf::VirtualDB::Frontend::init_backend(
 192     std::list<std::string> databases, mp::Package &package,
 193     int &error_code, std::string &addinfo)
 194 {
 195     BackendPtr b = create_backend_from_databases(databases, error_code,
 196                                                  addinfo);
 197     if (!b)
 198         return b;
 199     Package init_package(b->m_backend_session, package.origin());
 200     init_package.copy_filter(package);
 201
 202     mp::odr odr;
 203
 204     Z_APDU *init_apdu = zget_APDU(odr, Z_APDU_initRequest);
 205
 206     mp::util::set_vhost_otherinfo(&init_apdu->u.initRequest->otherInfo, odr,
 207                                    b->m_targets);
 208     Z_InitRequest *req = init_apdu->u.initRequest;
 209
 210     // copy stuff from Frontend Init Request
 211     Z_GDU *org_gdu = m_init_gdu.get();
 212     Z_InitRequest *org_init = org_gdu->u.z3950->u.initRequest;
 213
 214     req->idAuthentication = org_init->idAuthentication;
 215     req->implementationId = org_init->implementationId;
 216     req->implementationName = org_init->implementationName;
 217     req->implementationVersion = org_init->implementationVersion;
 218     *req->preferredMessageSize = *org_init->preferredMessageSize;
 219     *req->maximumRecordSize = *org_init->maximumRecordSize;
 220
 221     ODR_MASK_SET(req->options, Z_Options_search);
 222     ODR_MASK_SET(req->options, Z_Options_present);
 223     ODR_MASK_SET(req->options, Z_Options_namedResultSets);
 224     ODR_MASK_SET(req->options, Z_Options_scan);
 225
 226     ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_1);
 227     ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_2);
 228     ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_3);
 229
 230     init_package.request() = init_apdu;
 231
 232     init_package.move(b->m_route);  // sending init
 233
 234     Z_GDU *gdu = init_package.response().get();
 235     // we hope to get an init response
 236     error_code = 0;
 237     if (gdu && gdu->which == Z_GDU_Z3950
 238         && gdu->u.z3950->which == Z_APDU_initResponse)
 239     {
 240         Z_InitResponse *res = gdu->u.z3950->u.initResponse;
 241         if (ODR_MASK_GET(res->options, Z_Options_namedResultSets))
 242         {
 243             b->m_named_result_sets = true;
 244         }
 245         if (*res->result && !init_package.session().is_closed())
 246         {
 247             m_backend_list.push_back(b);
 248             return b;
 249         }
 250         mp::util::get_init_diagnostics(res, error_code, addinfo);
 251     }
 252     if (error_code == 0)
 253     {
 254         std::list<std::string>::const_iterator db_it = databases.begin();
 255         error_code = YAZ_BIB1_ACCESS_TO_SPECIFIED_DATABASE_DENIED;
 256         if (db_it != databases.end())
 257             addinfo = *db_it;
 258     }
 259     if (!init_package.session().is_closed())
 260     {
 261         Package close_package(b->m_backend_session, package.origin());
 262         close_package.copy_filter(package);
 263         close_package.session().close();
 264         close_package.move(b->m_route);  // closing it
 265     }
 266     BackendPtr null;
 267     return null;
 268 }
 269
 270 void yf::VirtualDB::Frontend::search(mp::Package &package, Z_APDU *apdu_req)
 271 {
 272     yazpp_1::GDU ngdu(apdu_req);
 273     Z_SearchRequest *req = ngdu.get()->u.z3950->u.searchRequest;
 274     std::string vhost;
 275     std::string resultSetId = req->resultSetName;
 276     mp::odr odr;
 277
 278     std::list<std::string> databases;
 279     int i;
 280     for (i = 0; i<req->num_databaseNames; i++)
 281         databases.push_back(req->databaseNames[i]);
 282
 283     Sets_it sets_it = m_sets.find(req->resultSetName);
 284     if (sets_it != m_sets.end())
 285     {
 286         // result set already exist
 287         // if replace indicator is off: we return diagnostic if
 288         // result set already exist.
 289         if (*req->replaceIndicator == 0)
 290         {
 291             Z_APDU *apdu =
 292                 odr.create_searchResponse(
 293                     apdu_req,
 294                     YAZ_BIB1_RESULT_SET_EXISTS_AND_REPLACE_INDICATOR_OFF,
 295                     0);
 296             package.response() = apdu;
 297
 298             return;
 299         }
 300         sets_it->second.m_backend->m_number_of_sets--;
 301     }
 302     // pick up any existing database with named result sets ..
 303     // or one which has no result sets.. yet.
 304     BackendPtr b; // null for now
 305     std::list<BackendPtr>::const_iterator map_it;
 306     map_it = m_backend_list.begin();
 307     for (; map_it != m_backend_list.end(); map_it++)
 308     {
 309         BackendPtr tmp = *map_it;
 310         if (tmp->m_frontend_databases == databases &&
 311             (tmp->m_named_result_sets ||
 312              tmp->m_number_of_sets == 0))
 313         {
 314             b = *map_it;
 315             break;
 316         }
 317     }
 318     if (!b)  // no backend yet. Must create a new one
 319     {
 320         int error_code;
 321         std::string addinfo;
 322         b = init_backend(databases, package, error_code, addinfo);
 323         if (!b)
 324         {
 325             // did not get a backend (unavailable somehow?)
 326
 327             Z_APDU *apdu =
 328                 odr.create_searchResponse(
 329                     apdu_req, error_code, addinfo.c_str());
 330             package.response() = apdu;
 331             return;
 332         }
 333     }
 334     m_sets.erase(req->resultSetName);
 335     // sending search to backend
 336     Package search_package(b->m_backend_session, package.origin());
 337
 338     search_package.copy_filter(package);
 339
 340     std::string backend_setname;
 341     if (b->m_named_result_sets)
 342     {
 343         backend_setname = std::string(req->resultSetName);
 344     }
 345     else
 346     {
 347         backend_setname = "default";
 348         req->resultSetName = odr_strdup(odr, backend_setname.c_str());
 349     }
 350
 351     // pick first targets spec and move the databases from it ..
 352     std::list<std::string>::const_iterator t_it = b->m_targets.begin();
 353     if (t_it != b->m_targets.end())
 354     {
 355         mp::util::set_databases_from_zurl(odr, *t_it,
 356                                                 &req->num_databaseNames,
 357                                                 &req->databaseNames);
 358     }
 359
 360     *req->replaceIndicator = 1;
 361
 362     search_package.request() = ngdu;
 363
 364     search_package.move(b->m_route);
 365
 366     if (search_package.session().is_closed())
 367     {
 368         package.response() = search_package.response();
 369         package.session().close();
 370         return;
 371     }
 372     b->m_number_of_sets++;
 373
 374     m_sets[resultSetId] = VirtualDB::Set(b, backend_setname);
 375     fixup_package(search_package, b);
 376     package.response() = search_package.response();
 377 }
 378
 379 yf::VirtualDB::Frontend::Frontend(Rep *rep)
 380 {
 381     m_p = rep;
 382     m_is_virtual = false;
 383 }
 384
 385 void yf::VirtualDB::Frontend::close(mp::Package &package)
 386 {
 387     std::list<BackendPtr>::const_iterator b_it;
 388
 389     for (b_it = m_backend_list.begin(); b_it != m_backend_list.end(); b_it++)
 390     {
 391         (*b_it)->m_backend_session.close();
 392         Package close_package((*b_it)->m_backend_session, package.origin());
 393         close_package.copy_filter(package);
 394         close_package.move((*b_it)->m_route);
 395     }
 396     m_backend_list.clear();
 397 }
 398
 399 yf::VirtualDB::Frontend::~Frontend()
 400 {
 401 }
 402
 403 yf::VirtualDB::FrontendPtr yf::VirtualDB::Rep::get_frontend(mp::Package &package)
 404 {
 405     boost::mutex::scoped_lock lock(m_mutex);
 406
 407     std::map<mp::Session,yf::VirtualDB::FrontendPtr>::iterator it;
 408
 409     while(true)
 410     {
 411         it = m_clients.find(package.session());
 412         if (it == m_clients.end())
 413             break;
 414
 415         if (!it->second->m_in_use)
 416         {
 417             it->second->m_in_use = true;
 418             return it->second;
 419         }
 420         m_cond_session_ready.wait(lock);
 421     }
 422     FrontendPtr f(new Frontend(this));
 423     m_clients[package.session()] = f;
 424     f->m_in_use = true;
 425     return f;
 426 }
 427
 428 void yf::VirtualDB::Rep::release_frontend(mp::Package &package)
 429 {
 430     boost::mutex::scoped_lock lock(m_mutex);
 431     std::map<mp::Session,yf::VirtualDB::FrontendPtr>::iterator it;
 432
 433     it = m_clients.find(package.session());
 434     if (it != m_clients.end())
 435     {
 436         if (package.session().is_closed())
 437         {
 438             it->second->close(package);
 439             m_clients.erase(it);
 440         }
 441         else
 442         {
 443             it->second->m_in_use = false;
 444         }
 445         m_cond_session_ready.notify_all();
 446     }
 447 }
 448
 449
 450 yf::VirtualDB::Set::Set(BackendPtr b, std::string setname)
 451     :  m_backend(b), m_setname(setname)
 452 {
 453 }
 454
 455
 456 yf::VirtualDB::Set::Set()
 457 {
 458 }
 459
 460
 461 yf::VirtualDB::Set::~Set()
 462 {
 463 }
 464
 465 yf::VirtualDB::Map::Map(std::string database,
 466                         std::list<std::string> targets, std::string route)
 467     : m_dbpattern(database), m_targets(targets), m_route(route)
 468 {
 469 }
 470
 471 yf::VirtualDB::Map::Map(std::string database,
 472                         std::string target, std::string route)
 473     : m_dbpattern(database), m_route(route)
 474 {
 475     m_targets.push_back(target);
 476 }
 477
 478
 479 yf::VirtualDB::Map::Map()
 480 {
 481 }
 482
 483 bool yf::VirtualDB::Map::match(const std::string db) const
 484 {
 485     std::string norm_db = mp::util::database_name_normalize(db);
 486     if (yaz_match_glob(m_dbpattern.c_str(), norm_db.c_str()))
 487         return true;
 488     return false;
 489 }
 490
 491 yf::VirtualDB::VirtualDB() : m_p(new VirtualDB::Rep)
 492 {
 493     m_p->pass_vhosts = false;
 494 }
 495
 496 yf::VirtualDB::~VirtualDB() {
 497 }
 498
 499 void yf::VirtualDB::Frontend::fixup_npr_record(ODR odr, Z_NamePlusRecord *npr,
 500                                              BackendPtr b)
 501 {
 502     if (npr->databaseName)
 503     {
 504         std::string b_database = std::string(npr->databaseName);
 505
 506         // consider each of the frontend databases..
 507         std::list<std::string>::const_iterator db_it;
 508         for (db_it = b->m_frontend_databases.begin();
 509              db_it != b->m_frontend_databases.end(); db_it++)
 510         {
 511             // see which target it corresponds to.. (if any)
 512             std::list<VirtualDB::Map>::const_iterator map_it =
 513                 m_p->m_maps.begin();
 514             while (map_it != m_p->m_maps.end())
 515             {
 516                 if (map_it->match(*db_it))
 517                     break;
 518                 map_it++;
 519             }
 520             if (map_it != m_p->m_maps.end())
 521             {
 522                 std::list<std::string>::const_iterator t
 523                     = map_it->m_targets.begin();
 524                 while (t != map_it->m_targets.end())
 525                 {
 526                     if (*t == b_database)
 527                     {
 528                         npr->databaseName = odr_strdup(odr, (*db_it).c_str());
 529                         return;
 530                     }
 531                     t++;
 532                 }
 533             }
 534
 535         }
 536         db_it = b->m_frontend_databases.begin();
 537         if (db_it != b->m_frontend_databases.end())
 538         {
 539             std::string database = *db_it;
 540             npr->databaseName = odr_strdup(odr, database.c_str());
 541         }
 542     }
 543 }
 544
 545 void yf::VirtualDB::Frontend::fixup_npr_records(ODR odr, Z_Records *records,
 546                                               BackendPtr b)
 547 {
 548     if (records && records->which == Z_Records_DBOSD)
 549     {
 550         Z_NamePlusRecordList *nprlist = records->u.databaseOrSurDiagnostics;
 551         int i;
 552         for (i = 0; i < nprlist->num_records; i++)
 553         {
 554             fixup_npr_record(odr, nprlist->records[i], b);
 555         }
 556     }
 557 }
 558
 559 void yf::VirtualDB::Frontend::fixup_package(mp::Package &p, BackendPtr b)
 560 {
 561     Z_GDU *gdu = p.response().get();
 562     mp::odr odr;
 563
 564     if (gdu && gdu->which == Z_GDU_Z3950)
 565     {
 566         Z_APDU *apdu = gdu->u.z3950;
 567         if (apdu->which == Z_APDU_presentResponse)
 568         {
 569             fixup_npr_records(odr, apdu->u.presentResponse->records, b);
 570             p.response() = gdu;
 571         }
 572         else if (apdu->which == Z_APDU_searchResponse)
 573         {
 574             fixup_npr_records(odr,  apdu->u.searchResponse->records, b);
 575             p.response() = gdu;
 576         }
 577     }
 578 }
 579
 580 void yf::VirtualDB::Frontend::present(mp::Package &package, Z_APDU *apdu_req)
 581 {
 582     yazpp_1::GDU ngdu(apdu_req);
 583     Z_PresentRequest *req = ngdu.get()->u.z3950->u.presentRequest;
 584     std::string resultSetId = req->resultSetId;
 585     mp::odr odr;
 586
 587     Sets_it sets_it = m_sets.find(resultSetId);
 588     if (sets_it == m_sets.end())
 589     {
 590         Z_APDU *apdu =
 591             odr.create_presentResponse(
 592                 apdu_req,
 593                 YAZ_BIB1_SPECIFIED_RESULT_SET_DOES_NOT_EXIST,
 594                 resultSetId.c_str());
 595         package.response() = apdu;
 596         return;
 597     }
 598     Session *id =
 599         new mp::Session(sets_it->second.m_backend->m_backend_session);
 600
 601     // sending present to backend
 602     Package present_package(*id, package.origin());
 603     present_package.copy_filter(package);
 604
 605     req->resultSetId = odr_strdup(odr, sets_it->second.m_setname.c_str());
 606
 607     present_package.request() = ngdu;
 608
 609     present_package.move(sets_it->second.m_backend->m_route);
 610
 611     fixup_package(present_package, sets_it->second.m_backend);
 612
 613     if (present_package.session().is_closed())
 614     {
 615         package.response() = present_package.response();
 616         package.session().close();
 617     }
 618     else
 619     {
 620         package.response() = present_package.response();
 621     }
 622     delete id;
 623 }
 624
 625 int yf::VirtualDB::Frontend::relay_apdu(mp::Package &package, Z_APDU *apdu_req)
 626 {
 627     int no = 0;
 628     std::list<BackendPtr>::const_iterator map_it;
 629     map_it = m_backend_list.begin();
 630     for (; map_it != m_backend_list.end(); map_it++)
 631     {
 632         BackendPtr b = *map_it;
 633
 634         Package relay_package(b->m_backend_session, package.origin());
 635         relay_package.copy_filter(package);
 636
 637         relay_package.request() = yazpp_1::GDU(apdu_req);
 638
 639         relay_package.move(b->m_route);
 640         package.response() = relay_package.response();
 641         no++;
 642     }
 643     return no;
 644 }
 645
 646 void yf::VirtualDB::Frontend::scan(mp::Package &package, Z_APDU *apdu_req)
 647 {
 648     yazpp_1::GDU ngdu(apdu_req);
 649     Z_ScanRequest *req = ngdu.get()->u.z3950->u.scanRequest;
 650     std::string vhost;
 651     mp::odr odr;
 652
 653     std::list<std::string> databases;
 654     int i;
 655     for (i = 0; i<req->num_databaseNames; i++)
 656         databases.push_back(req->databaseNames[i]);
 657
 658     BackendPtr b;
 659     // pick up any existing backend with a database match
 660     std::list<BackendPtr>::const_iterator map_it;
 661     map_it = m_backend_list.begin();
 662     for (; map_it != m_backend_list.end(); map_it++)
 663     {
 664         BackendPtr tmp = *map_it;
 665         if (tmp->m_frontend_databases == databases)
 666             break;
 667     }
 668     if (map_it != m_backend_list.end())
 669         b = *map_it;
 670     if (!b)  // no backend yet. Must create a new one
 671     {
 672         int error_code;
 673         std::string addinfo;
 674         b = init_backend(databases, package, error_code, addinfo);
 675         if (!b)
 676         {
 677             // did not get a backend (unavailable somehow?)
 678             Z_APDU *apdu =
 679                 odr.create_scanResponse(
 680                     apdu_req, error_code, addinfo.c_str());
 681             package.response() = apdu;
 682
 683             return;
 684         }
 685     }
 686     // sending scan to backend
 687     Package scan_package(b->m_backend_session, package.origin());
 688
 689     scan_package.copy_filter(package);
 690
 691     // pick first targets spec and move the databases from it ..
 692     std::list<std::string>::const_iterator t_it = b->m_targets.begin();
 693     if (t_it != b->m_targets.end())
 694     {
 695         mp::util::set_databases_from_zurl(odr, *t_it,
 696                                                 &req->num_databaseNames,
 697                                                 &req->databaseNames);
 698     }
 699
 700     scan_package.request() = ngdu;
 701
 702     scan_package.move(b->m_route);
 703
 704     if (scan_package.session().is_closed())
 705     {
 706         package.response() = scan_package.response();
 707         package.session().close();
 708         return;
 709     }
 710     package.response() = scan_package.response();
 711 }
 712
 713
 714 void yf::VirtualDB::add_map_db2targets(std::string db,
 715                                        std::list<std::string> targets,
 716                                        std::string route)
 717 {
 718     m_p->m_maps.push_back(
 719         VirtualDB::Map(mp::util::database_name_normalize(db), targets, route));
 720 }
 721
 722
 723 void yf::VirtualDB::add_map_db2target(std::string db,
 724                                       std::string target,
 725                                       std::string route)
 726
 727 {
 728     m_p->m_maps.push_back(
 729         VirtualDB::Map(mp::util::database_name_normalize(db), target, route));
 730 }
 731
 732 void yf::VirtualDB::process(mp::Package &package) const
 733 {
 734     FrontendPtr f = m_p->get_frontend(package);
 735
 736     Z_GDU *gdu = package.request().get();
 737
 738     if (gdu && gdu->which == Z_GDU_Z3950 && gdu->u.z3950->which ==
 739         Z_APDU_initRequest && !f->m_is_virtual)
 740     {
 741         Z_InitRequest *req = gdu->u.z3950->u.initRequest;
 742
 743         std::list<std::string> vhosts;
 744         mp::util::get_vhost_otherinfo(req->otherInfo, vhosts);
 745
 746         if (vhosts.size() > 0 && m_p->pass_vhosts)
 747         {
 748             package.move();
 749         }
 750         else
 751         {
 752             f->m_init_gdu = gdu;
 753
 754             mp::odr odr;
 755             Z_APDU *apdu = odr.create_initResponse(gdu->u.z3950, 0, 0);
 756             Z_InitResponse *resp = apdu->u.initResponse;
 757
 758             int i;
 759             static const int masks[] = {
 760                 Z_Options_search,
 761                 Z_Options_present,
 762                 Z_Options_namedResultSets,
 763                 Z_Options_scan,
 764                 -1
 765             };
 766             for (i = 0; masks[i] != -1; i++)
 767                 if (ODR_MASK_GET(req->options, masks[i]))
 768                     ODR_MASK_SET(resp->options, masks[i]);
 769
 770             static const int versions[] = {
 771                 Z_ProtocolVersion_1,
 772                 Z_ProtocolVersion_2,
 773                 Z_ProtocolVersion_3,
 774                 -1
 775             };
 776             for (i = 0; versions[i] != -1; i++)
 777                 if (ODR_MASK_GET(req->protocolVersion, versions[i]))
 778                     ODR_MASK_SET(resp->protocolVersion, versions[i]);
 779                 else
 780                     break;
 781
 782             *resp->preferredMessageSize = *req->preferredMessageSize;
 783             *resp->maximumRecordSize = *req->maximumRecordSize;
 784
 785             package.response() = apdu;
 786             f->m_is_virtual = true;
 787         }
 788     }
 789     else if (!f->m_is_virtual)
 790         package.move();
 791     else if (gdu && gdu->which == Z_GDU_Z3950)
 792     {
 793         Z_APDU *apdu = gdu->u.z3950;
 794         if (apdu->which == Z_APDU_initRequest)
 795         {
 796             mp::odr odr;
 797
 798             package.response() = odr.create_close(
 799                 apdu,
 800                 Z_Close_protocolError,
 801                 "double init");
 802
 803             package.session().close();
 804         }
 805         else if (apdu->which == Z_APDU_searchRequest)
 806         {
 807             f->search(package, apdu);
 808         }
 809         else if (apdu->which == Z_APDU_presentRequest)
 810         {
 811             f->present(package, apdu);
 812         }
 813         else if (apdu->which == Z_APDU_scanRequest)
 814         {
 815             f->scan(package, apdu);
 816         }
 817         else if (apdu->which == Z_APDU_close)
 818         {
 819             if (f->relay_apdu(package, apdu) == 0)
 820             {
 821                 mp::odr odr;
 822
 823                 package.response() = odr.create_close(
 824                     apdu, Z_Close_finished, "virt_db");
 825
 826                 package.session().close();
 827             }
 828         }
 829         else
 830         {
 831             mp::odr odr;
 832
 833             package.response() = odr.create_close(
 834                 apdu, Z_Close_protocolError,
 835                 "unsupported APDU in filter_virt_db");
 836
 837             package.session().close();
 838         }
 839     }
 840     m_p->release_frontend(package);
 841 }
 842
 843 void mp::filter::VirtualDB::configure(const xmlNode * ptr, bool test_only,
 844                                       const char *path)
 845 {
 846     for (ptr = ptr->children; ptr; ptr = ptr->next)
 847     {
 848         if (ptr->type != XML_ELEMENT_NODE)
 849             continue;
 850         if (!strcmp((const char *) ptr->name, "pass-vhosts"))
 851         {
 852             m_p->pass_vhosts = mp::xml::get_bool(ptr, false);
 853         }
 854         else if (!strcmp((const char *) ptr->name, "virtual"))
 855         {
 856             std::string database;
 857             std::list<std::string> targets;
 858             xmlNode *v_node = ptr->children;
 859             for (; v_node; v_node = v_node->next)
 860             {
 861                 if (v_node->type != XML_ELEMENT_NODE)
 862                     continue;
 863
 864                 if (mp::xml::is_element_mp(v_node, "database"))
 865                     database = mp::xml::get_text(v_node);
 866                 else if (mp::xml::is_element_mp(v_node, "target"))
 867                     targets.push_back(mp::xml::get_text(v_node));
 868                 else
 869                     throw mp::filter::FilterException
 870                         ("Bad element "
 871                          + std::string((const char *) v_node->name)
 872                          + " in virtual section"
 873                             );
 874             }
 875             std::string route = mp::xml::get_route(ptr);
 876
 877             VirtualDB::Map vmap(mp::util::database_name_normalize(database),
 878                                 targets, route);
 879             m_p->m_maps.push_back(vmap);
 880         }
 881         else
 882         {
 883             throw mp::filter::FilterException
 884                 ("Bad element "
 885                  + std::string((const char *) ptr->name)
 886                  + " in virt_db filter");
 887         }
 888     }
 889 }
 890
 891 static mp::filter::Base* filter_creator()
 892 {
 893     return new mp::filter::VirtualDB;
 894 }
 895
 896 extern "C" {
 897     struct metaproxy_1_filter_struct metaproxy_1_filter_virt_db = {
 898         0,
 899         "virt_db",
 900         filter_creator
 901     };
 902 }
 903
 904
 905 /*
 906  * Local variables:
 907  * c-basic-offset: 4
 908  * c-file-style: "Stroustrup"
 909  * indent-tabs-mode: nil
 910  * End:
 911  * vim: shiftwidth=4 tabstop=8 expandtab
 912  */
 913