src/filter_virt_db.cpp

   1 /* $Id: filter_virt_db.cpp,v 1.3 2005-10-25 11:48:30 adam Exp $
   2    Copyright (c) 2005, Index Data.
   3
   4 %LICENSE%
   5  */
   6
   7 #include "config.hpp"
   8
   9 #include "filter.hpp"
  10 #include "router.hpp"
  11 #include "package.hpp"
  12
  13 #include <boost/thread/mutex.hpp>
  14
  15 #include "filter_virt_db.hpp"
  16
  17 #include <yaz/zgdu.h>
  18 #include <yaz/log.h>
  19 #include <yaz/otherinfo.h>
  20 #include <yaz/diagbib1.h>
  21
  22 #include <list>
  23 #include <map>
  24 #include <iostream>
  25
  26 namespace yf = yp2::filter;
  27
  28 namespace yp2 {
  29     namespace filter {
  30         struct Virt_db_set {
  31             Virt_db_set(yp2::Session &id, std::string setname,
  32                         std::string vhost);
  33             Virt_db_set();
  34             ~Virt_db_set();
  35
  36             yp2::Session m_session;
  37             std::string m_setname;
  38             std::string m_vhost;
  39         };
  40         struct Virt_db_session {
  41             Virt_db_session(yp2::Session &id, bool use_vhost);
  42             Virt_db_session();
  43             yp2::Session m_session;
  44             bool m_use_vhost;
  45             std::map<std::string,Virt_db_set> m_sets;
  46         };
  47         struct Virt_db_map {
  48             Virt_db_map(std::string vhost);
  49             Virt_db_map();
  50             std::string m_vhost;
  51         };
  52         class Virt_db::Rep {
  53             friend class Virt_db;
  54
  55             void release_session(Package &package);
  56             void init(Package &package, Z_APDU *apdu, bool &move_later);
  57             void search(Package &package, Z_APDU *apdu, bool &move_later);
  58             void present(Package &package, Z_APDU *apdu, bool &move_later);
  59         private:
  60             boost::mutex m_sessions_mutex;
  61             std::map<yp2::Session,Virt_db_session>m_sessions;
  62             std::map<std::string, Virt_db_map>m_maps;
  63
  64             typedef std::map<yp2::Session,Virt_db_session>::iterator Ses_it;
  65             typedef std::map<std::string,Virt_db_set>::iterator Sets_it;
  66         };
  67     }
  68 }
  69
  70 yf::Virt_db_set::Virt_db_set(yp2::Session &id, std::string setname,
  71                              std::string vhost)
  72     :   m_session(id), m_setname(setname), m_vhost(vhost)
  73 {
  74 }
  75
  76
  77 yf::Virt_db_set::Virt_db_set()
  78 {
  79 }
  80
  81
  82 yf::Virt_db_set::~Virt_db_set()
  83 {
  84 }
  85
  86 yf::Virt_db_map::Virt_db_map(std::string vhost)
  87     : m_vhost(vhost)
  88 {
  89 }
  90
  91 yf::Virt_db_map::Virt_db_map()
  92 {
  93 }
  94
  95 yf::Virt_db_session::Virt_db_session()
  96     : m_use_vhost(false)
  97 {
  98
  99 }
 100
 101 yf::Virt_db_session::Virt_db_session(yp2::Session &id,
 102                                      bool use_vhost) :
 103     m_session(id) , m_use_vhost(use_vhost)
 104 {
 105
 106 }
 107
 108 yf::Virt_db::Virt_db() {
 109     m_p = new Virt_db::Rep;
 110 }
 111
 112 yf::Virt_db::~Virt_db() {
 113     delete m_p;
 114 }
 115
 116 void yf::Virt_db::Rep::release_session(Package &package)
 117 {
 118     boost::mutex::scoped_lock lock(m_sessions_mutex);
 119
 120     Ses_it it = m_sessions.find(package.session());
 121
 122     if (it != m_sessions.end())
 123         m_sessions.erase(it);
 124 }
 125
 126 void yf::Virt_db::Rep::present(Package &package, Z_APDU *apdu, bool &move_later){
 127     Session *id = 0;
 128     Z_PresentRequest *req = apdu->u.presentRequest;
 129     {
 130         boost::mutex::scoped_lock lock(m_sessions_mutex);
 131
 132         Ses_it it = m_sessions.find(package.session());
 133         if (it == m_sessions.end())
 134         {
 135             ODR odr = odr_createmem(ODR_ENCODE);
 136
 137             Z_APDU *apdu = zget_APDU(odr, Z_APDU_close);
 138
 139             *apdu->u.close->closeReason = Z_Close_protocolError;
 140
 141             package.response() = apdu;
 142             package.session().close();
 143             odr_destroy(odr);
 144             return;
 145         }
 146         if (it->second.m_use_vhost)
 147         {
 148             move_later = true;
 149             return;
 150         }
 151         Sets_it sets_it = it->second.m_sets.find(req->resultSetId);
 152         if (sets_it == it->second.m_sets.end())
 153         {
 154             ODR odr = odr_createmem(ODR_ENCODE);
 155             Z_APDU *apdu = zget_APDU(odr, Z_APDU_presentResponse);
 156
 157             Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
 158             apdu->u.presentResponse->records = rec;
 159             rec->which = Z_Records_NSD;
 160             rec->u.nonSurrogateDiagnostic =
 161                 zget_DefaultDiagFormat(
 162                     odr,
 163                     YAZ_BIB1_SPECIFIED_RESULT_SET_DOES_NOT_EXIST,
 164                     req->resultSetId);
 165             package.response() = apdu;
 166             odr_destroy(odr);
 167             return;
 168         }
 169         id = new yp2::Session(it->second.m_session);
 170     }
 171     ODR odr = odr_createmem(ODR_ENCODE);
 172
 173     // sending present to backend
 174     Package present_package(*id, package.origin());
 175     present_package.copy_filter(package);
 176
 177     req->resultSetId = odr_strdup(odr, "default");
 178     present_package.request() = yazpp_1::GDU(apdu);
 179
 180     odr_destroy(odr);
 181
 182     present_package.move();
 183
 184     package.response() = present_package.response();
 185     // must check for a closed present session..
 186     delete id;
 187 }
 188
 189 void yf::Virt_db::Rep::search(Package &package, Z_APDU *apdu, bool &move_later)
 190 {
 191     Z_SearchRequest *req = apdu->u.searchRequest;
 192     std::string vhost;
 193     std::string database;
 194     Session *id = 0;
 195     {
 196         boost::mutex::scoped_lock lock(m_sessions_mutex);
 197
 198         Ses_it it = m_sessions.find(package.session());
 199         if (it == m_sessions.end())
 200         {
 201             ODR odr = odr_createmem(ODR_ENCODE);
 202
 203             Z_APDU *apdu = zget_APDU(odr, Z_APDU_close);
 204
 205             *apdu->u.close->closeReason = Z_Close_protocolError;
 206
 207             package.response() = apdu;
 208             package.session().close();
 209             odr_destroy(odr);
 210             return;
 211         }
 212         if (it->second.m_use_vhost)
 213         {
 214             move_later = true;
 215             return;
 216         }
 217         if (req->num_databaseNames != 1)
 218         {   // exactly one database must be specified
 219             ODR odr = odr_createmem(ODR_ENCODE);
 220             Z_APDU *apdu = zget_APDU(odr, Z_APDU_searchResponse);
 221
 222             Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
 223             apdu->u.searchResponse->records = rec;
 224             rec->which = Z_Records_NSD;
 225             rec->u.nonSurrogateDiagnostic =
 226                 zget_DefaultDiagFormat(
 227                     odr, YAZ_BIB1_TOO_MANY_DATABASES_SPECIFIED, 0);
 228             package.response() = apdu;
 229
 230             odr_destroy(odr);
 231             return;
 232         }
 233         database = req->databaseNames[0];
 234         std::map<std::string, Virt_db_map>::iterator map_it;
 235         map_it = m_maps.find(database);
 236         if (map_it == m_maps.end())
 237         {   // no map for database: return diagnostic
 238             ODR odr = odr_createmem(ODR_ENCODE);
 239             Z_APDU *apdu = zget_APDU(odr, Z_APDU_searchResponse);
 240
 241             Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
 242             apdu->u.searchResponse->records = rec;
 243             rec->which = Z_Records_NSD;
 244             rec->u.nonSurrogateDiagnostic =
 245                 zget_DefaultDiagFormat(
 246                     odr, YAZ_BIB1_DATABASE_UNAVAILABLE, database.c_str());
 247             package.response() = apdu;
 248
 249             odr_destroy(odr);
 250             return;
 251         }
 252         if (*req->replaceIndicator == 0)
 253         {
 254             Sets_it sets_it = it->second.m_sets.find(req->resultSetName);
 255             if (sets_it != it->second.m_sets.end())
 256             {
 257                 ODR odr = odr_createmem(ODR_ENCODE);
 258                 Z_APDU *apdu = zget_APDU(odr, Z_APDU_searchResponse);
 259
 260                 Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
 261                 apdu->u.searchResponse->records = rec;
 262                 rec->which = Z_Records_NSD;
 263                 rec->u.nonSurrogateDiagnostic =
 264                     zget_DefaultDiagFormat(
 265                         odr,
 266                         YAZ_BIB1_RESULT_SET_EXISTS_AND_REPLACE_INDICATOR_OFF,
 267                         0);
 268                 package.response() = apdu;
 269
 270                 odr_destroy(odr);
 271                 return;
 272             }
 273         }
 274         vhost = map_it->second.m_vhost;
 275         id = new Session;
 276
 277         it->second.m_sets[req->resultSetName] =
 278             Virt_db_set(*id, req->resultSetName, vhost);
 279     }
 280     const char *vhost_cstr = vhost.c_str();
 281     if (true)
 282     {  // sending init to backend
 283         Package init_package(*id, package.origin());
 284         init_package.copy_filter(package);
 285
 286         ODR odr = odr_createmem(ODR_ENCODE);
 287         Z_APDU *init_apdu = zget_APDU(odr, Z_APDU_initRequest);
 288
 289         yaz_oi_set_string_oidval(&init_apdu->u.initRequest->otherInfo, odr,
 290                                  VAL_PROXY, 1, vhost_cstr);
 291
 292         init_package.request() = init_apdu;
 293         odr_destroy(odr);
 294
 295         init_package.move();  // sending init
 296
 297         if (init_package.session().is_closed())
 298         {
 299             ODR odr = odr_createmem(ODR_ENCODE);
 300             Z_APDU *apdu = zget_APDU(odr, Z_APDU_searchResponse);
 301
 302             Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
 303             apdu->u.searchResponse->records = rec;
 304             rec->which = Z_Records_NSD;
 305             rec->u.nonSurrogateDiagnostic =
 306                 zget_DefaultDiagFormat(
 307                     odr, YAZ_BIB1_DATABASE_UNAVAILABLE, database.c_str());
 308             package.response() = apdu;
 309
 310             odr_destroy(odr);
 311             return;
 312         }
 313     }
 314     // sending search to backend
 315     Package search_package(*id, package.origin());
 316
 317     search_package.copy_filter(package);
 318     const char *sep = strchr(vhost_cstr, '/');
 319     ODR odr = odr_createmem(ODR_ENCODE);
 320     if (sep)
 321         req->databaseNames[0] = odr_strdup(odr, sep+1);
 322
 323     *req->replaceIndicator = 1;
 324     req->resultSetName = odr_strdup(odr, "default");
 325     search_package.request() = yazpp_1::GDU(apdu);
 326
 327     odr_destroy(odr);
 328
 329     search_package.move();
 330
 331     package.response() = search_package.response();
 332     // must check for a closed search session..
 333     delete id;
 334 }
 335
 336 void yf::Virt_db::Rep::init(Package &package, Z_APDU *apdu, bool &move_later)
 337 {
 338     release_session(package);
 339     boost::mutex::scoped_lock lock(m_sessions_mutex);
 340
 341     Z_InitRequest *req = apdu->u.initRequest;
 342
 343     const char *vhost =
 344         yaz_oi_get_string_oidval(&req->otherInfo, VAL_PROXY, 1, 0);
 345     if (!vhost)
 346     {
 347         ODR odr = odr_createmem(ODR_ENCODE);
 348
 349         Z_APDU *apdu = zget_APDU(odr, Z_APDU_initResponse);
 350         Z_InitResponse *resp = apdu->u.initResponse;
 351
 352         int i;
 353         static const int masks[] = {
 354             Z_Options_search, Z_Options_present, Z_Options_namedResultSets, 0
 355         };
 356         for (i = 0; masks[i]; i++)
 357             if (ODR_MASK_GET(req->options, masks[i]))
 358                 ODR_MASK_SET(resp->options, masks[i]);
 359
 360         package.response() = apdu;
 361
 362         odr_destroy(odr);
 363
 364         m_sessions[package.session()] = Virt_db_session(package.session(), false);
 365     }
 366     else
 367     {
 368         m_sessions[package.session()] = Virt_db_session(package.session(), true);
 369         move_later = true;
 370     }
 371 }
 372
 373 void yf::Virt_db::add_map_db2vhost(std::string db, std::string vhost)
 374 {
 375     m_p->m_maps[db] = Virt_db_map(vhost);
 376 }
 377
 378 void yf::Virt_db::process(Package &package) const
 379 {
 380     Z_GDU *gdu = package.request().get();
 381
 382     if (!gdu || gdu->which != Z_GDU_Z3950)
 383         package.move();
 384     else
 385     {
 386         bool move_later = false;
 387         Z_APDU *apdu = gdu->u.z3950;
 388         if (apdu->which == Z_APDU_initRequest)
 389         {
 390             m_p->init(package, apdu, move_later);
 391         }
 392         else if (apdu->which == Z_APDU_searchRequest)
 393         {
 394             m_p->search(package, apdu, move_later);
 395         }
 396         else if (apdu->which == Z_APDU_presentRequest)
 397         {
 398             m_p->present(package, apdu, move_later);
 399         }
 400         else
 401         {
 402             ODR odr = odr_createmem(ODR_ENCODE);
 403
 404             Z_APDU *apdu = zget_APDU(odr, Z_APDU_close);
 405
 406             *apdu->u.close->closeReason = Z_Close_protocolError;
 407
 408             package.response() = apdu;
 409             package.session().close();
 410             odr_destroy(odr);
 411         }
 412         if (move_later)
 413             package.move();
 414     }
 415     if (package.session().is_closed())
 416         m_p->release_session(package);
 417 }
 418
 419
 420 /*
 421  * Local variables:
 422  * c-basic-offset: 4
 423  * indent-tabs-mode: nil
 424  * c-file-style: "stroustrup"
 425  * End:
 426  * vim: shiftwidth=4 tabstop=8 expandtab
 427  */