src/filter_zoom.cpp

   1 /* This file is part of Metaproxy.
   2    Copyright (C) 2005-2011 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 #include "filter_zoom.hpp"
  21 #include <yaz/zoom.h>
  22 #include <yaz/yaz-version.h>
  23 #include <yaz/tpath.h>
  24 #include <yaz/srw.h>
  25 #include <metaproxy/package.hpp>
  26 #include <metaproxy/util.hpp>
  27 #include <metaproxy/xmlutil.hpp>
  28 #include "torus.hpp"
  29
  30 #include <libxslt/xsltutils.h>
  31 #include <libxslt/transform.h>
  32
  33 #include <boost/thread/mutex.hpp>
  34 #include <boost/thread/condition.hpp>
  35 #include <yaz/ccl_xml.h>
  36 #include <yaz/ccl.h>
  37 #include <yaz/rpn2cql.h>
  38 #include <yaz/rpn2solr.h>
  39 #include <yaz/pquery.h>
  40 #include <yaz/cql.h>
  41 #include <yaz/oid_db.h>
  42 #include <yaz/diagbib1.h>
  43 #include <yaz/log.h>
  44 #include <yaz/zgdu.h>
  45 #include <yaz/querytowrbuf.h>
  46
  47 namespace mp = metaproxy_1;
  48 namespace yf = mp::filter;
  49
  50 namespace metaproxy_1 {
  51     namespace filter {
  52         struct Zoom::Searchable : boost::noncopyable {
  53             std::string authentication;
  54             std::string cfAuth;
  55             std::string cfProxy;
  56             std::string cfSubDb;
  57             std::string udb;
  58             std::string target;
  59             std::string query_encoding;
  60             std::string sru;
  61             std::string request_syntax;
  62             std::string element_set;
  63             std::string record_encoding;
  64             std::string transform_xsl_fname;
  65             std::string urlRecipe;
  66             std::string contentConnector;
  67             bool use_turbomarc;
  68             bool piggyback;
  69             CCL_bibset ccl_bibset;
  70             Searchable(CCL_bibset base);
  71             ~Searchable();
  72         };
  73         class Zoom::Backend : boost::noncopyable {
  74             friend class Impl;
  75             friend class Frontend;
  76             std::string zurl;
  77             ZOOM_connection m_connection;
  78             ZOOM_resultset m_resultset;
  79             std::string m_frontend_database;
  80             SearchablePtr sptr;
  81             xsltStylesheetPtr xsp;
  82             std::string content_session_id;
  83         public:
  84             Backend(SearchablePtr sptr);
  85             ~Backend();
  86             void connect(std::string zurl, int *error, char **addinfo,
  87                          ODR odr);
  88             void search_pqf(const char *pqf, Odr_int *hits,
  89                             int *error, char **addinfo, ODR odr);
  90             void search_cql(const char *cql, Odr_int *hits,
  91                             int *error, char **addinfo, ODR odr);
  92             void present(Odr_int start, Odr_int number, ZOOM_record *recs,
  93                          int *error, char **addinfo, ODR odr);
  94             void set_option(const char *name, const char *value);
  95             const char *get_option(const char *name);
  96             void get_zoom_error(int *error, char **addinfo, ODR odr);
  97         };
  98         class Zoom::Frontend : boost::noncopyable {
  99             friend class Impl;
 100             Impl *m_p;
 101             bool m_is_virtual;
 102             bool m_in_use;
 103             yazpp_1::GDU m_init_gdu;
 104             BackendPtr m_backend;
 105             void handle_package(mp::Package &package);
 106             void handle_search(mp::Package &package);
 107             void handle_present(mp::Package &package);
 108             BackendPtr get_backend_from_databases(std::string &database,
 109                                                   int *error,
 110                                                   char **addinfo,
 111                                                   ODR odr);
 112             Z_Records *get_records(Odr_int start,
 113                                    Odr_int number_to_present,
 114                                    int *error,
 115                                    char **addinfo,
 116                                    Odr_int *number_of_records_returned,
 117                                    ODR odr, BackendPtr b,
 118                                    Odr_oid *preferredRecordSyntax,
 119                                    const char *element_set_name);
 120         public:
 121             Frontend(Impl *impl);
 122             ~Frontend();
 123         };
 124         class Zoom::Impl {
 125             friend class Frontend;
 126         public:
 127             Impl();
 128             ~Impl();
 129             void process(metaproxy_1::Package & package);
 130             void configure(const xmlNode * ptr, bool test_only,
 131                            const char *path);
 132         private:
 133             void configure_local_records(const xmlNode * ptr, bool test_only);
 134             FrontendPtr get_frontend(mp::Package &package);
 135             void release_frontend(mp::Package &package);
 136             SearchablePtr parse_torus_record(const xmlNode *ptr);
 137             struct cql_node *convert_cql_fields(struct cql_node *cn, ODR odr);
 138             std::map<mp::Session, FrontendPtr> m_clients;
 139             boost::mutex m_mutex;
 140             boost::condition m_cond_session_ready;
 141             std::string torus_url;
 142             std::map<std::string,std::string> fieldmap;
 143             std::string xsldir;
 144             std::string file_path;
 145             std::string content_proxy_server;
 146             std::string content_tmp_file;
 147             CCL_bibset bibset;
 148             std::string element_transform;
 149             std::string element_raw;
 150             std::map<std::string,SearchablePtr> s_map;
 151         };
 152     }
 153 }
 154
 155 // define Pimpl wrapper forwarding to Impl
 156
 157 yf::Zoom::Zoom() : m_p(new Impl)
 158 {
 159 }
 160
 161 yf::Zoom::~Zoom()
 162 {  // must have a destructor because of boost::scoped_ptr
 163 }
 164
 165 void yf::Zoom::configure(const xmlNode *xmlnode, bool test_only,
 166                          const char *path)
 167 {
 168     m_p->configure(xmlnode, test_only, path);
 169 }
 170
 171 void yf::Zoom::process(mp::Package &package) const
 172 {
 173     m_p->process(package);
 174 }
 175
 176
 177 // define Implementation stuff
 178
 179 yf::Zoom::Backend::Backend(SearchablePtr ptr) : sptr(ptr)
 180 {
 181     m_connection = ZOOM_connection_create(0);
 182     m_resultset = 0;
 183     xsp = 0;
 184 }
 185
 186 yf::Zoom::Backend::~Backend()
 187 {
 188     if (xsp)
 189         xsltFreeStylesheet(xsp);
 190     ZOOM_connection_destroy(m_connection);
 191     ZOOM_resultset_destroy(m_resultset);
 192 }
 193
 194
 195 void yf::Zoom::Backend::get_zoom_error(int *error, char **addinfo,
 196                                        ODR odr)
 197 {
 198     const char *msg = 0;
 199     const char *zoom_addinfo = 0;
 200     *error = ZOOM_connection_error(m_connection, &msg, &zoom_addinfo);
 201     if (*error)
 202     {
 203         if (*error >= ZOOM_ERROR_CONNECT)
 204         {
 205             // turn ZOOM diagnostic into a Bib-1 2: with addinfo=zoom err msg
 206             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 207             *addinfo = (char *) odr_malloc(
 208                 odr, 20 + strlen(msg) +
 209                 (zoom_addinfo ? strlen(zoom_addinfo) : 0));
 210             strcpy(*addinfo, msg);
 211             if (zoom_addinfo)
 212             {
 213                 strcat(*addinfo, ": ");
 214                 strcat(*addinfo, zoom_addinfo);
 215                 strcat(*addinfo, " ");
 216             }
 217         }
 218         else
 219         {
 220             *addinfo = (char *) odr_malloc(
 221                 odr, 20 + (zoom_addinfo ? strlen(zoom_addinfo) : 0));
 222             **addinfo = '\0';
 223             if (zoom_addinfo && *zoom_addinfo)
 224             {
 225                 strcpy(*addinfo, zoom_addinfo);
 226                 strcat(*addinfo, " ");
 227             }
 228             strcat(*addinfo, "(backend)");
 229         }
 230     }
 231 }
 232
 233 void yf::Zoom::Backend::connect(std::string zurl,
 234                                 int *error, char **addinfo,
 235                                 ODR odr)
 236 {
 237     ZOOM_connection_connect(m_connection, zurl.c_str(), 0);
 238     get_zoom_error(error, addinfo, odr);
 239 }
 240
 241 void yf::Zoom::Backend::search_pqf(const char *pqf, Odr_int *hits,
 242                                    int *error, char **addinfo, ODR odr)
 243 {
 244     m_resultset = ZOOM_connection_search_pqf(m_connection, pqf);
 245     get_zoom_error(error, addinfo, odr);
 246     if (*error == 0)
 247         *hits = ZOOM_resultset_size(m_resultset);
 248     else
 249         *hits = 0;
 250 }
 251
 252 void yf::Zoom::Backend::search_cql(const char *cql, Odr_int *hits,
 253                                    int *error, char **addinfo, ODR odr)
 254 {
 255     ZOOM_query q = ZOOM_query_create();
 256
 257     ZOOM_query_cql(q, cql);
 258
 259     m_resultset = ZOOM_connection_search(m_connection, q);
 260     ZOOM_query_destroy(q);
 261     get_zoom_error(error, addinfo, odr);
 262     if (*error == 0)
 263         *hits = ZOOM_resultset_size(m_resultset);
 264     else
 265         *hits = 0;
 266 }
 267
 268 void yf::Zoom::Backend::present(Odr_int start, Odr_int number,
 269                                 ZOOM_record *recs,
 270                                 int *error, char **addinfo, ODR odr)
 271 {
 272     ZOOM_resultset_records(m_resultset, recs, start, number);
 273     get_zoom_error(error, addinfo, odr);
 274 }
 275
 276 void yf::Zoom::Backend::set_option(const char *name, const char *value)
 277 {
 278     ZOOM_connection_option_set(m_connection, name, value);
 279     if (m_resultset)
 280         ZOOM_resultset_option_set(m_resultset, name, value);
 281 }
 282
 283 const char *yf::Zoom::Backend::get_option(const char *name)
 284 {
 285     return ZOOM_connection_option_get(m_connection, name);
 286 }
 287
 288 yf::Zoom::Searchable::Searchable(CCL_bibset base)
 289 {
 290     piggyback = true;
 291     use_turbomarc = true;
 292     ccl_bibset = ccl_qual_dup(base);
 293 }
 294
 295 yf::Zoom::Searchable::~Searchable()
 296 {
 297     ccl_qual_rm(&ccl_bibset);
 298 }
 299
 300 yf::Zoom::Frontend::Frontend(Impl *impl) :
 301     m_p(impl), m_is_virtual(false), m_in_use(true)
 302 {
 303 }
 304
 305 yf::Zoom::Frontend::~Frontend()
 306 {
 307 }
 308
 309 yf::Zoom::FrontendPtr yf::Zoom::Impl::get_frontend(mp::Package &package)
 310 {
 311     boost::mutex::scoped_lock lock(m_mutex);
 312
 313     std::map<mp::Session,yf::Zoom::FrontendPtr>::iterator it;
 314
 315     while(true)
 316     {
 317         it = m_clients.find(package.session());
 318         if (it == m_clients.end())
 319             break;
 320
 321         if (!it->second->m_in_use)
 322         {
 323             it->second->m_in_use = true;
 324             return it->second;
 325         }
 326         m_cond_session_ready.wait(lock);
 327     }
 328     FrontendPtr f(new Frontend(this));
 329     m_clients[package.session()] = f;
 330     f->m_in_use = true;
 331     return f;
 332 }
 333
 334 void yf::Zoom::Impl::release_frontend(mp::Package &package)
 335 {
 336     boost::mutex::scoped_lock lock(m_mutex);
 337     std::map<mp::Session,yf::Zoom::FrontendPtr>::iterator it;
 338
 339     it = m_clients.find(package.session());
 340     if (it != m_clients.end())
 341     {
 342         if (package.session().is_closed())
 343         {
 344             m_clients.erase(it);
 345         }
 346         else
 347         {
 348             it->second->m_in_use = false;
 349         }
 350         m_cond_session_ready.notify_all();
 351     }
 352 }
 353
 354 yf::Zoom::Impl::Impl() : element_transform("pz2") , element_raw("raw")
 355 {
 356     bibset = ccl_qual_mk();
 357 }
 358
 359 yf::Zoom::Impl::~Impl()
 360 {
 361     ccl_qual_rm(&bibset);
 362 }
 363
 364 yf::Zoom::SearchablePtr yf::Zoom::Impl::parse_torus_record(const xmlNode *ptr)
 365 {
 366     Zoom::SearchablePtr s(new Searchable(bibset));
 367
 368     for (ptr = ptr->children; ptr; ptr = ptr->next)
 369     {
 370         if (ptr->type != XML_ELEMENT_NODE)
 371             continue;
 372         if (!strcmp((const char *) ptr->name, "layer"))
 373             ptr = ptr->children;
 374         else if (!strcmp((const char *) ptr->name,
 375                          "authentication"))
 376         {
 377             s->authentication = mp::xml::get_text(ptr);
 378         }
 379         else if (!strcmp((const char *) ptr->name,
 380                          "cfAuth"))
 381         {
 382             s->cfAuth = mp::xml::get_text(ptr);
 383         }
 384         else if (!strcmp((const char *) ptr->name,
 385                          "cfProxy"))
 386         {
 387             s->cfProxy = mp::xml::get_text(ptr);
 388         }
 389         else if (!strcmp((const char *) ptr->name,
 390                          "cfSubDb"))
 391         {
 392             s->cfSubDb = mp::xml::get_text(ptr);
 393         }
 394         else if (!strcmp((const char *) ptr->name,
 395                          "contentConnector"))
 396         {
 397             s->contentConnector = mp::xml::get_text(ptr);
 398         }
 399         else if (!strcmp((const char *) ptr->name, "udb"))
 400         {
 401             s->udb = mp::xml::get_text(ptr);
 402         }
 403         else if (!strcmp((const char *) ptr->name, "zurl"))
 404         {
 405             s->target = mp::xml::get_text(ptr);
 406         }
 407         else if (!strcmp((const char *) ptr->name, "sru"))
 408         {
 409             s->sru = mp::xml::get_text(ptr);
 410         }
 411         else if (!strcmp((const char *) ptr->name,
 412                          "queryEncoding"))
 413         {
 414             s->query_encoding = mp::xml::get_text(ptr);
 415         }
 416         else if (!strcmp((const char *) ptr->name,
 417                          "piggyback"))
 418         {
 419             s->piggyback = mp::xml::get_bool(ptr, true);
 420         }
 421         else if (!strcmp((const char *) ptr->name,
 422                          "requestSyntax"))
 423         {
 424             s->request_syntax = mp::xml::get_text(ptr);
 425         }
 426         else if (!strcmp((const char *) ptr->name,
 427                          "elementSet"))
 428         {
 429             s->element_set = mp::xml::get_text(ptr);
 430         }
 431         else if (!strcmp((const char *) ptr->name,
 432                          "recordEncoding"))
 433         {
 434             s->record_encoding = mp::xml::get_text(ptr);
 435         }
 436         else if (!strcmp((const char *) ptr->name,
 437                          "transform"))
 438         {
 439             s->transform_xsl_fname = mp::xml::get_text(ptr);
 440         }
 441         else if (!strcmp((const char *) ptr->name,
 442                          "urlRecipe"))
 443         {
 444             s->urlRecipe = mp::xml::get_text(ptr);
 445         }
 446         else if (!strcmp((const char *) ptr->name,
 447                          "useTurboMarc"))
 448         {
 449             ; // useTurboMarc is ignored
 450         }
 451         else if (!strncmp((const char *) ptr->name,
 452                           "cclmap_", 7))
 453         {
 454             std::string value = mp::xml::get_text(ptr);
 455             ccl_qual_fitem(s->ccl_bibset, value.c_str(),
 456                            (const char *) ptr->name + 7);
 457         }
 458     }
 459     return s;
 460 }
 461
 462 void yf::Zoom::Impl::configure_local_records(const xmlNode *ptr, bool test_only)
 463 {
 464     while (ptr && ptr->type != XML_ELEMENT_NODE)
 465         ptr = ptr->next;
 466
 467     if (ptr)
 468     {
 469         if (!strcmp((const char *) ptr->name, "records"))
 470         {
 471             for (ptr = ptr->children; ptr; ptr = ptr->next)
 472             {
 473                 if (ptr->type != XML_ELEMENT_NODE)
 474                     continue;
 475                 if (!strcmp((const char *) ptr->name, "record"))
 476                 {
 477                     SearchablePtr s = parse_torus_record(ptr);
 478                     if (s)
 479                     {
 480                         std::string udb = s->udb;
 481                         if (udb.length())
 482                             s_map[s->udb] = s;
 483                         else
 484                         {
 485                             throw mp::filter::FilterException
 486                                 ("No udb for local torus record");
 487                         }
 488                     }
 489                 }
 490                 else
 491                 {
 492                     throw mp::filter::FilterException
 493                         ("Bad element "
 494                          + std::string((const char *) ptr->name)
 495                          + " in zoom filter inside element "
 496                          "<torus><records>");
 497                 }
 498             }
 499         }
 500         else
 501         {
 502             throw mp::filter::FilterException
 503                 ("Bad element "
 504                  + std::string((const char *) ptr->name)
 505                  + " in zoom filter inside element <torus>");
 506         }
 507     }
 508 }
 509
 510 void yf::Zoom::Impl::configure(const xmlNode *ptr, bool test_only,
 511                                const char *path)
 512 {
 513     content_tmp_file = "/tmp/mp_content_proxy.";
 514     if (path && *path)
 515     {
 516         file_path = path;
 517     }
 518     for (ptr = ptr->children; ptr; ptr = ptr->next)
 519     {
 520         if (ptr->type != XML_ELEMENT_NODE)
 521             continue;
 522         else if (!strcmp((const char *) ptr->name, "torus"))
 523         {
 524             const struct _xmlAttr *attr;
 525             for (attr = ptr->properties; attr; attr = attr->next)
 526             {
 527                 if (!strcmp((const char *) attr->name, "url"))
 528                     torus_url = mp::xml::get_text(attr->children);
 529                 else if (!strcmp((const char *) attr->name, "xsldir"))
 530                     xsldir = mp::xml::get_text(attr->children);
 531                 else if (!strcmp((const char *) attr->name, "element_transform"))
 532                     element_transform = mp::xml::get_text(attr->children);
 533                 else if (!strcmp((const char *) attr->name, "element_raw"))
 534                     element_raw = mp::xml::get_text(attr->children);
 535                 else
 536                     throw mp::filter::FilterException(
 537                         "Bad attribute " + std::string((const char *)
 538                                                        attr->name));
 539             }
 540             configure_local_records(ptr->children, test_only);
 541         }
 542         else if (!strcmp((const char *) ptr->name, "cclmap"))
 543         {
 544             const char *addinfo = 0;
 545             ccl_xml_config(bibset, ptr, &addinfo);
 546         }
 547         else if (!strcmp((const char *) ptr->name, "fieldmap"))
 548         {
 549             const struct _xmlAttr *attr;
 550             std::string ccl_field;
 551             std::string cql_field;
 552             for (attr = ptr->properties; attr; attr = attr->next)
 553             {
 554                 if (!strcmp((const char *) attr->name, "ccl"))
 555                     ccl_field = mp::xml::get_text(attr->children);
 556                 else if (!strcmp((const char *) attr->name, "cql"))
 557                     cql_field = mp::xml::get_text(attr->children);
 558                 else
 559                     throw mp::filter::FilterException(
 560                         "Bad attribute " + std::string((const char *)
 561                                                        attr->name));
 562             }
 563             if (cql_field.length())
 564                 fieldmap[cql_field] = ccl_field;
 565         }
 566         else if (!strcmp((const char *) ptr->name, "contentProxy"))
 567         {
 568             const struct _xmlAttr *attr;
 569             for (attr = ptr->properties; attr; attr = attr->next)
 570             {
 571                 if (!strcmp((const char *) attr->name, "server"))
 572                     content_proxy_server = mp::xml::get_text(attr->children);
 573                 else if (!strcmp((const char *) attr->name, "tmp_file"))
 574                     content_tmp_file = mp::xml::get_text(attr->children);
 575                 else
 576                     throw mp::filter::FilterException(
 577                         "Bad attribute " + std::string((const char *)
 578                                                        attr->name));
 579             }
 580         }
 581         else
 582         {
 583             throw mp::filter::FilterException
 584                 ("Bad element "
 585                  + std::string((const char *) ptr->name)
 586                  + " in zoom filter");
 587         }
 588     }
 589 }
 590
 591 yf::Zoom::BackendPtr yf::Zoom::Frontend::get_backend_from_databases(
 592     std::string &database, int *error, char **addinfo, ODR odr)
 593 {
 594     std::list<BackendPtr>::const_iterator map_it;
 595     if (m_backend && m_backend->m_frontend_database == database)
 596         return m_backend;
 597
 598     const char *sru_proxy = 0;
 599     std::string db_args;
 600     std::string torus_db;
 601     size_t db_arg_pos = database.find(',');
 602     if (db_arg_pos != std::string::npos)
 603     {
 604         torus_db = database.substr(0, db_arg_pos);
 605         db_args = database.substr(db_arg_pos + 1);
 606     }
 607     else
 608         torus_db = database;
 609
 610     SearchablePtr sptr;
 611
 612     std::map<std::string,SearchablePtr>::iterator it;
 613     it = m_p->s_map.find(torus_db);
 614     if (it != m_p->s_map.end())
 615         sptr = it->second;
 616     else
 617     {
 618         xmlDoc *doc = mp::get_searchable(m_p->torus_url, torus_db);
 619         if (!doc)
 620         {
 621             *error = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
 622             *addinfo = odr_strdup(odr, database.c_str());
 623             BackendPtr b;
 624             return b;
 625         }
 626         const xmlNode *ptr = xmlDocGetRootElement(doc);
 627         if (ptr)
 628         {   // presumably ptr is a records element node
 629             // parse first record in document
 630             for (ptr = ptr->children; ptr; ptr = ptr->next)
 631             {
 632                 if (ptr->type == XML_ELEMENT_NODE
 633                     && !strcmp((const char *) ptr->name, "record"))
 634                 {
 635                     sptr = m_p->parse_torus_record(ptr);
 636                     break;
 637                 }
 638             }
 639         }
 640         xmlFreeDoc(doc);
 641     }
 642
 643     if (!sptr)
 644     {
 645         *error = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
 646         *addinfo = odr_strdup(odr, database.c_str());
 647         BackendPtr b;
 648         return b;
 649     }
 650
 651     xsltStylesheetPtr xsp = 0;
 652     if (sptr->transform_xsl_fname.length())
 653     {
 654         const char *path = 0;
 655
 656         if (m_p->xsldir.length())
 657             path = m_p->xsldir.c_str();
 658         else
 659             path = m_p->file_path.c_str();
 660         std::string fname;
 661
 662         char fullpath[1024];
 663         char *cp = yaz_filepath_resolve(sptr->transform_xsl_fname.c_str(),
 664                                         path, 0, fullpath);
 665         if (cp)
 666             fname.assign(cp);
 667         else
 668         {
 669             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 670             *addinfo = (char *)
 671                 odr_malloc(odr, 40 + sptr->transform_xsl_fname.length());
 672             sprintf(*addinfo, "File could not be read: %s",
 673                     sptr->transform_xsl_fname.c_str());
 674             BackendPtr b;
 675             return b;
 676         }
 677         xmlDoc *xsp_doc = xmlParseFile(fname.c_str());
 678         if (!xsp_doc)
 679         {
 680             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 681             *addinfo = (char *) odr_malloc(odr, 40 + fname.length());
 682             sprintf(*addinfo, "xmlParseFile failed. File: %s", fname.c_str());
 683             BackendPtr b;
 684             return b;
 685         }
 686         xsp = xsltParseStylesheetDoc(xsp_doc);
 687         if (!xsp)
 688         {
 689             *error = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
 690             *addinfo = odr_strdup(odr, "xsltParseStylesheetDoc failed");
 691             BackendPtr b;
 692             xmlFreeDoc(xsp_doc);
 693             return b;
 694         }
 695     }
 696
 697     m_backend.reset();
 698
 699     BackendPtr b(new Backend(sptr));
 700
 701     b->xsp = xsp;
 702     b->m_frontend_database = database;
 703     std::string authentication = sptr->authentication;
 704
 705     b->set_option("timeout", "40");
 706
 707     if (sptr->query_encoding.length())
 708         b->set_option("rpnCharset", sptr->query_encoding.c_str());
 709
 710     if (sptr->cfAuth.length())
 711     {
 712         // A CF target
 713         b->set_option("user", sptr->cfAuth.c_str());
 714         if (db_args.length() == 0)
 715         {
 716             if (authentication.length())
 717             {
 718                 // no database (auth) args specified already.. and the
 719                 // Torus authentication has it.. Generate the args that CF
 720                 // understands..
 721                 size_t found = authentication.find('/');
 722                 if (found != std::string::npos)
 723                 {
 724                     db_args += "user=" + mp::util::uri_encode(authentication.substr(0, found))
 725                         + "&password=" + mp::util::uri_encode(authentication.substr(found+1));
 726                 }
 727                 else
 728                     db_args += "user=" + mp::util::uri_encode(authentication);
 729             }
 730             if (sptr->cfProxy.length())
 731             {
 732                 if (db_args.length())
 733                     db_args += "&";
 734                 db_args += "proxy=" + mp::util::uri_encode(sptr->cfProxy);
 735             }
 736         }
 737         if (sptr->cfSubDb.length())
 738         {
 739             if (db_args.length())
 740                 db_args += "&";
 741             db_args += "subdatabase=" + mp::util::uri_encode(sptr->cfSubDb);
 742         }
 743     }
 744     else
 745     {
 746         // A non-CF target
 747         if (db_args.length())
 748         {
 749             // user has specified backend authentication
 750             const char *param_user = 0;
 751             const char *param_password = 0;
 752             char **names;
 753             char **values;
 754             int i;
 755             int no_parms = yaz_uri_to_array(db_args.c_str(),
 756                                             odr, &names, &values);
 757             for (i = 0; i < no_parms; i++)
 758             {
 759                 const char *name = names[i];
 760                 const char *value = values[i];
 761                 if (!strcmp(name, "user"))
 762                     param_user = value;
 763                 else if (!strcmp(name, "password"))
 764                     param_password = value;
 765                 else if (!strcmp(name, "proxy"))
 766                     sru_proxy = value;
 767                 else
 768                 {
 769                     BackendPtr notfound;
 770                     char *msg = (char*) odr_malloc(odr, strlen(name) + 30);
 771                     *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 772                     sprintf(msg, "Bad database argument: %s", name);
 773                     *addinfo = msg;
 774                     return notfound;
 775                 }
 776             }
 777             if (param_user && param_password)
 778             {
 779                 char *auth = (char*) odr_malloc(
 780                     odr, strlen(param_user) + strlen(param_password) + 2);
 781                 strcpy(auth, param_user);
 782                 strcat(auth, "/");
 783                 strcat(auth, param_password);
 784                 b->set_option("user", auth);
 785             }
 786             db_args.clear(); // no arguments to be passed (non-CF)
 787         }
 788         else
 789         {
 790             // use authentication from Torus, if given
 791             if (authentication.length())
 792                 b->set_option("user", authentication.c_str());
 793         }
 794     }
 795
 796     if (sru_proxy)
 797         b->set_option("proxy", sru_proxy);
 798
 799     if (b->sptr->contentConnector.length())
 800     {
 801         int fd;
 802
 803         char *fname = (char *) xmalloc(m_p->content_tmp_file.length() + 8);
 804         strcpy(fname, m_p->content_tmp_file.c_str());
 805         strcat(fname, "XXXXXX");
 806         fd = mkstemp(fname);
 807
 808         if (fd == -1)
 809         {
 810             yaz_log(YLOG_WARN|YLOG_ERRNO, "create %s", fname);
 811             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 812             *addinfo = (char *)  odr_malloc(odr, 40 + strlen(fname));
 813             sprintf(*addinfo, "Could not create %s", fname);
 814
 815             xfree(fname);
 816             BackendPtr backend_null;
 817             return backend_null;
 818         }
 819         b->content_session_id.assign(fname + (strlen(fname) - 6));
 820         char buf[1024];
 821         sprintf(buf, "#content_proxy\n");
 822         write(fd, buf, strlen(buf));
 823         close(fd);
 824         yaz_log(YLOG_LOG, "file %s created\n", fname);
 825         xfree(fname);
 826     }
 827
 828
 829     std::string url;
 830     if (sptr->sru.length())
 831     {
 832         url = "http://" + sptr->target;
 833         b->set_option("sru", sptr->sru.c_str());
 834     }
 835     else
 836     {
 837         url = sptr->target;
 838     }
 839     if (db_args.length())
 840         url += "," + db_args;
 841     yaz_log(YLOG_LOG, "url=%s", url.c_str());
 842     b->connect(url, error, addinfo, odr);
 843     if (*error == 0)
 844     {
 845         m_backend = b;
 846     }
 847     return b;
 848 }
 849
 850 Z_Records *yf::Zoom::Frontend::get_records(Odr_int start,
 851                                            Odr_int number_to_present,
 852                                            int *error,
 853                                            char **addinfo,
 854                                            Odr_int *number_of_records_returned,
 855                                            ODR odr,
 856                                            BackendPtr b,
 857                                            Odr_oid *preferredRecordSyntax,
 858                                            const char *element_set_name)
 859 {
 860     *number_of_records_returned = 0;
 861     Z_Records *records = 0;
 862     bool enable_pz2_retrieval = false; // whether target profile is used
 863     bool enable_pz2_transform = false; // whether XSLT is used as well
 864     bool assume_marc8_charset = false;
 865
 866     if (start < 0 || number_to_present <= 0)
 867         return records;
 868
 869     if (number_to_present > 10000)
 870         number_to_present = 10000;
 871
 872     ZOOM_record *recs = (ZOOM_record *)
 873         odr_malloc(odr, number_to_present * sizeof(*recs));
 874
 875     char oid_name_str[OID_STR_MAX];
 876     const char *syntax_name = 0;
 877
 878     if (preferredRecordSyntax &&
 879         !oid_oidcmp(preferredRecordSyntax, yaz_oid_recsyn_xml)
 880         && element_set_name)
 881     {
 882         if (!strcmp(element_set_name, m_p->element_transform.c_str()))
 883         {
 884             enable_pz2_retrieval = true;
 885             enable_pz2_transform = true;
 886         }
 887         else if (!strcmp(element_set_name, m_p->element_raw.c_str()))
 888         {
 889             enable_pz2_retrieval = true;
 890         }
 891     }
 892
 893     if (enable_pz2_retrieval)
 894     {
 895         if (b->sptr->request_syntax.length())
 896         {
 897             syntax_name = b->sptr->request_syntax.c_str();
 898             const Odr_oid *syntax_oid =
 899                 yaz_string_to_oid(yaz_oid_std(), CLASS_RECSYN, syntax_name);
 900             if (!oid_oidcmp(syntax_oid, yaz_oid_recsyn_usmarc)
 901                 || !oid_oidcmp(syntax_oid, yaz_oid_recsyn_opac))
 902                 assume_marc8_charset = true;
 903         }
 904     }
 905     else if (preferredRecordSyntax)
 906         syntax_name =
 907             yaz_oid_to_string_buf(preferredRecordSyntax, 0, oid_name_str);
 908
 909     b->set_option("preferredRecordSyntax", syntax_name);
 910
 911     if (enable_pz2_retrieval)
 912     {
 913         element_set_name = 0;
 914         if (b->sptr->element_set.length())
 915             element_set_name = b->sptr->element_set.c_str();
 916     }
 917
 918     b->set_option("elementSetName", element_set_name);
 919
 920     b->present(start, number_to_present, recs, error, addinfo, odr);
 921
 922     Odr_int i = 0;
 923     if (!*error)
 924     {
 925         for (i = 0; i < number_to_present; i++)
 926             if (!recs[i])
 927                 break;
 928     }
 929     if (i > 0)
 930     {  // only return records if no error and at least one record
 931         char *odr_database = odr_strdup(odr,
 932                                         b->m_frontend_database.c_str());
 933         Z_NamePlusRecordList *npl = (Z_NamePlusRecordList *)
 934             odr_malloc(odr, sizeof(*npl));
 935         *number_of_records_returned = i;
 936         npl->num_records = i;
 937         npl->records = (Z_NamePlusRecord **)
 938             odr_malloc(odr, i * sizeof(*npl->records));
 939         for (i = 0; i < number_to_present; i++)
 940         {
 941             Z_NamePlusRecord *npr = 0;
 942             const char *addinfo;
 943             int sur_error = ZOOM_record_error(recs[i], 0 /* msg */,
 944                                               &addinfo, 0 /* diagset */);
 945
 946             if (sur_error)
 947             {
 948                 npr = zget_surrogateDiagRec(odr, odr_database, sur_error,
 949                                             addinfo);
 950             }
 951             else if (enable_pz2_retrieval)
 952             {
 953                 char rec_type_str[100];
 954                 const char *record_encoding = 0;
 955
 956                 if (b->sptr->record_encoding.length())
 957                     record_encoding = b->sptr->record_encoding.c_str();
 958                 else if (assume_marc8_charset)
 959                     record_encoding = "marc8";
 960
 961                 strcpy(rec_type_str, b->sptr->use_turbomarc ? "txml" : "xml");
 962                 if (record_encoding)
 963                 {
 964                     strcat(rec_type_str, "; charset=");
 965                     strcat(rec_type_str, record_encoding);
 966                 }
 967
 968                 int rec_len;
 969                 xmlChar *xmlrec_buf = 0;
 970                 const char *rec_buf = ZOOM_record_get(recs[i], rec_type_str,
 971                                                       &rec_len);
 972                 if (rec_buf && b->xsp && enable_pz2_transform)
 973                 {
 974                     xmlDoc *rec_doc = xmlParseMemory(rec_buf, rec_len);
 975                     if (rec_doc)
 976                     {
 977                         xmlDoc *rec_res;
 978                         rec_res = xsltApplyStylesheet(b->xsp, rec_doc, 0);
 979
 980                         if (rec_res)
 981                             xsltSaveResultToString(&xmlrec_buf, &rec_len,
 982                                                    rec_res, b->xsp);
 983                         rec_buf = (const char *) xmlrec_buf;
 984                         xmlFreeDoc(rec_doc);
 985                         xmlFreeDoc(rec_res);
 986                     }
 987                 }
 988
 989                 if (rec_buf)
 990                 {
 991                     xmlDoc *doc = xmlParseMemory(rec_buf, rec_len);
 992                     std::string res =
 993                         mp::xml::url_recipe_handle(doc, b->sptr->urlRecipe);
 994                     if (res.length() && b->content_session_id.length())
 995                     {
 996                         size_t off = res.find_first_of("://");
 997                         if (off != std::string::npos)
 998                         {
 999                             char tmp[1024];
1000                             long id = 12345;
1001                             sprintf(tmp, "%s.%s/",
1002                                     b->content_session_id.c_str(),
1003                                     m_p->content_proxy_server.c_str());
1004                             res.insert(off + 3, tmp);
1005                         }
1006                     }
1007                     if (res.length())
1008                     {
1009                         xmlNode *ptr = xmlDocGetRootElement(doc);
1010                         while (ptr && ptr->type != XML_ELEMENT_NODE)
1011                             ptr = ptr->next;
1012                         xmlNode *c =
1013                             xmlNewChild(ptr, 0, BAD_CAST "generated-url", 0);
1014                         xmlNode * t = xmlNewText(BAD_CAST res.c_str());
1015                         xmlAddChild(c, t);
1016
1017                         if (xmlrec_buf)
1018                             xmlFree(xmlrec_buf);
1019
1020                         xmlDocDumpMemory(doc, &xmlrec_buf, &rec_len);
1021                         rec_buf = (const char *) xmlrec_buf;
1022                     }
1023                     xmlFreeDoc(doc);
1024                 }
1025                 if (rec_buf)
1026                 {
1027                     npr = (Z_NamePlusRecord *) odr_malloc(odr, sizeof(*npr));
1028                     npr->databaseName = odr_database;
1029                     npr->which = Z_NamePlusRecord_databaseRecord;
1030                     npr->u.databaseRecord =
1031                         z_ext_record_xml(odr, rec_buf, rec_len);
1032                 }
1033                 else
1034                 {
1035                     npr = zget_surrogateDiagRec(
1036                         odr, odr_database,
1037                         YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS,
1038                         rec_type_str);
1039                 }
1040                 if (xmlrec_buf)
1041                     xmlFree(xmlrec_buf);
1042             }
1043             else
1044             {
1045                 Z_External *ext =
1046                     (Z_External *) ZOOM_record_get(recs[i], "ext", 0);
1047                 if (ext)
1048                 {
1049                     npr = (Z_NamePlusRecord *) odr_malloc(odr, sizeof(*npr));
1050                     npr->databaseName = odr_database;
1051                     npr->which = Z_NamePlusRecord_databaseRecord;
1052                     npr->u.databaseRecord = ext;
1053                 }
1054                 else
1055                 {
1056                     npr = zget_surrogateDiagRec(
1057                         odr, odr_database,
1058                         YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS,
1059                         "ZOOM_record, type ext");
1060                 }
1061             }
1062             npl->records[i] = npr;
1063         }
1064         records = (Z_Records*) odr_malloc(odr, sizeof(*records));
1065         records->which = Z_Records_DBOSD;
1066         records->u.databaseOrSurDiagnostics = npl;
1067     }
1068     return records;
1069 }
1070
1071 struct cql_node *yf::Zoom::Impl::convert_cql_fields(struct cql_node *cn,
1072                                                     ODR odr)
1073 {
1074     struct cql_node *r = 0;
1075     if (!cn)
1076         return 0;
1077     switch (cn->which)
1078     {
1079     case CQL_NODE_ST:
1080         if (cn->u.st.index)
1081         {
1082             std::map<std::string,std::string>::const_iterator it;
1083             it = fieldmap.find(cn->u.st.index);
1084             if (it == fieldmap.end())
1085                 return cn;
1086             if (it->second.length())
1087                 cn->u.st.index = odr_strdup(odr, it->second.c_str());
1088             else
1089                 cn->u.st.index = 0;
1090         }
1091         break;
1092     case CQL_NODE_BOOL:
1093         r = convert_cql_fields(cn->u.boolean.left, odr);
1094         if (!r)
1095             r = convert_cql_fields(cn->u.boolean.right, odr);
1096         break;
1097     case CQL_NODE_SORT:
1098         r = convert_cql_fields(cn->u.sort.search, odr);
1099         break;
1100     }
1101     return r;
1102 }
1103
1104 void yf::Zoom::Frontend::handle_search(mp::Package &package)
1105 {
1106     Z_GDU *gdu = package.request().get();
1107     Z_APDU *apdu_req = gdu->u.z3950;
1108     Z_APDU *apdu_res = 0;
1109     mp::odr odr;
1110     Z_SearchRequest *sr = apdu_req->u.searchRequest;
1111     if (sr->num_databaseNames != 1)
1112     {
1113         apdu_res = odr.create_searchResponse(
1114             apdu_req, YAZ_BIB1_TOO_MANY_DATABASES_SPECIFIED, 0);
1115         package.response() = apdu_res;
1116         return;
1117     }
1118
1119     int error = 0;
1120     char *addinfo = 0;
1121     std::string db(sr->databaseNames[0]);
1122     BackendPtr b = get_backend_from_databases(db, &error, &addinfo, odr);
1123     if (error)
1124     {
1125         apdu_res =
1126             odr.create_searchResponse(apdu_req, error, addinfo);
1127         package.response() = apdu_res;
1128         return;
1129     }
1130
1131     b->set_option("setname", "default");
1132
1133     Odr_int hits = 0;
1134     Z_Query *query = sr->query;
1135     WRBUF ccl_wrbuf = 0;
1136     WRBUF pqf_wrbuf = 0;
1137
1138     if (query->which == Z_Query_type_1 || query->which == Z_Query_type_101)
1139     {
1140         // RPN
1141         pqf_wrbuf = wrbuf_alloc();
1142         yaz_rpnquery_to_wrbuf(pqf_wrbuf, query->u.type_1);
1143     }
1144     else if (query->which == Z_Query_type_2)
1145     {
1146         // CCL
1147         ccl_wrbuf = wrbuf_alloc();
1148         wrbuf_write(ccl_wrbuf, (const char *) query->u.type_2->buf,
1149                     query->u.type_2->len);
1150     }
1151     else if (query->which == Z_Query_type_104 &&
1152              query->u.type_104->which == Z_External_CQL)
1153     {
1154         // CQL
1155         const char *cql = query->u.type_104->u.cql;
1156         CQL_parser cp = cql_parser_create();
1157         int r = cql_parser_string(cp, cql);
1158         if (r)
1159         {
1160             cql_parser_destroy(cp);
1161             apdu_res =
1162                 odr.create_searchResponse(apdu_req,
1163                                           YAZ_BIB1_MALFORMED_QUERY,
1164                                           "CQL syntax error");
1165             package.response() = apdu_res;
1166             return;
1167         }
1168         struct cql_node *cn = cql_parser_result(cp);
1169         struct cql_node *cn_error = m_p->convert_cql_fields(cn, odr);
1170         if (cn_error)
1171         {
1172             // hopefully we are getting a ptr to a index+relation+term node
1173             addinfo = 0;
1174             if (cn_error->which == CQL_NODE_ST)
1175                 addinfo = cn_error->u.st.index;
1176
1177             apdu_res =
1178                 odr.create_searchResponse(apdu_req,
1179                                           YAZ_BIB1_UNSUPP_USE_ATTRIBUTE,
1180                                           addinfo);
1181             package.response() = apdu_res;
1182             return;
1183         }
1184         char ccl_buf[1024];
1185
1186         r = cql_to_ccl_buf(cn, ccl_buf, sizeof(ccl_buf));
1187         if (r == 0)
1188         {
1189             ccl_wrbuf = wrbuf_alloc();
1190             wrbuf_puts(ccl_wrbuf, ccl_buf);
1191         }
1192         cql_parser_destroy(cp);
1193         if (r)
1194         {
1195             apdu_res =
1196                 odr.create_searchResponse(apdu_req,
1197                                           YAZ_BIB1_MALFORMED_QUERY,
1198                                           "CQL to CCL conversion error");
1199             package.response() = apdu_res;
1200             return;
1201         }
1202     }
1203     else
1204     {
1205         apdu_res =
1206             odr.create_searchResponse(apdu_req, YAZ_BIB1_QUERY_TYPE_UNSUPP, 0);
1207         package.response() = apdu_res;
1208         return;
1209     }
1210
1211     if (ccl_wrbuf)
1212     {
1213         // CCL to PQF
1214         assert(pqf_wrbuf == 0);
1215         int cerror, cpos;
1216         struct ccl_rpn_node *cn;
1217         yaz_log(YLOG_LOG, "CCL: %s", wrbuf_cstr(ccl_wrbuf));
1218         cn = ccl_find_str(b->sptr->ccl_bibset, wrbuf_cstr(ccl_wrbuf),
1219                           &cerror, &cpos);
1220         wrbuf_destroy(ccl_wrbuf);
1221         if (!cn)
1222         {
1223             char *addinfo = odr_strdup(odr, ccl_err_msg(cerror));
1224             int z3950_diag = YAZ_BIB1_MALFORMED_QUERY;
1225
1226             switch (cerror)
1227             {
1228             case CCL_ERR_UNKNOWN_QUAL:
1229                 z3950_diag = YAZ_BIB1_UNSUPP_USE_ATTRIBUTE;
1230                 break;
1231             case CCL_ERR_TRUNC_NOT_LEFT:
1232             case CCL_ERR_TRUNC_NOT_RIGHT:
1233             case CCL_ERR_TRUNC_NOT_BOTH:
1234                 z3950_diag = YAZ_BIB1_UNSUPP_TRUNCATION_ATTRIBUTE;
1235                 break;
1236             }
1237             apdu_res =
1238                 odr.create_searchResponse(apdu_req, z3950_diag, addinfo);
1239             package.response() = apdu_res;
1240             return;
1241         }
1242         pqf_wrbuf = wrbuf_alloc();
1243         ccl_pquery(pqf_wrbuf, cn);
1244         ccl_rpn_delete(cn);
1245     }
1246
1247     assert(pqf_wrbuf);
1248     if (b->get_option("sru"))
1249     {
1250         int status = 0;
1251         Z_RPNQuery *zquery;
1252         zquery = p_query_rpn(odr, wrbuf_cstr(pqf_wrbuf));
1253         WRBUF wrb = wrbuf_alloc();
1254
1255         if (!strcmp(b->get_option("sru"), "solr"))
1256         {
1257             solr_transform_t cqlt = solr_transform_create();
1258
1259             status = solr_transform_rpn2solr_wrbuf(cqlt, wrb, zquery);
1260
1261             solr_transform_close(cqlt);
1262         }
1263         else
1264         {
1265             cql_transform_t cqlt = cql_transform_create();
1266
1267             status = cql_transform_rpn2cql_wrbuf(cqlt, wrb, zquery);
1268
1269             cql_transform_close(cqlt);
1270         }
1271         if (status == 0)
1272         {
1273             yaz_log(YLOG_LOG, "search CQL: %s", wrbuf_cstr(wrb));
1274             b->search_cql(wrbuf_cstr(wrb), &hits, &error, &addinfo, odr);
1275         }
1276
1277         wrbuf_destroy(wrb);
1278         wrbuf_destroy(pqf_wrbuf);
1279         if (status)
1280         {
1281             apdu_res =
1282                 odr.create_searchResponse(apdu_req, YAZ_BIB1_MALFORMED_QUERY,
1283                                           "can not convert from RPN to CQL/SOLR");
1284             package.response() = apdu_res;
1285             return;
1286         }
1287     }
1288     else
1289     {
1290         yaz_log(YLOG_LOG, "search PQF: %s", wrbuf_cstr(pqf_wrbuf));
1291         b->search_pqf(wrbuf_cstr(pqf_wrbuf), &hits, &error, &addinfo, odr);
1292         wrbuf_destroy(pqf_wrbuf);
1293     }
1294
1295
1296     const char *element_set_name = 0;
1297     Odr_int number_to_present = 0;
1298     if (!error)
1299         mp::util::piggyback_sr(sr, hits, number_to_present, &element_set_name);
1300
1301     Odr_int number_of_records_returned = 0;
1302     Z_Records *records = get_records(
1303         0, number_to_present, &error, &addinfo,
1304         &number_of_records_returned, odr, b, sr->preferredRecordSyntax,
1305         element_set_name);
1306     apdu_res = odr.create_searchResponse(apdu_req, error, addinfo);
1307     if (records)
1308     {
1309         apdu_res->u.searchResponse->records = records;
1310         apdu_res->u.searchResponse->numberOfRecordsReturned =
1311             odr_intdup(odr, number_of_records_returned);
1312     }
1313     apdu_res->u.searchResponse->resultCount = odr_intdup(odr, hits);
1314     package.response() = apdu_res;
1315 }
1316
1317 void yf::Zoom::Frontend::handle_present(mp::Package &package)
1318 {
1319     Z_GDU *gdu = package.request().get();
1320     Z_APDU *apdu_req = gdu->u.z3950;
1321     Z_APDU *apdu_res = 0;
1322     Z_PresentRequest *pr = apdu_req->u.presentRequest;
1323
1324     mp::odr odr;
1325     if (!m_backend)
1326     {
1327         package.response() = odr.create_presentResponse(
1328             apdu_req, YAZ_BIB1_SPECIFIED_RESULT_SET_DOES_NOT_EXIST, 0);
1329         return;
1330     }
1331     const char *element_set_name = 0;
1332     Z_RecordComposition *comp = pr->recordComposition;
1333     if (comp && comp->which != Z_RecordComp_simple)
1334     {
1335         package.response() = odr.create_presentResponse(
1336             apdu_req,
1337             YAZ_BIB1_PRESENT_COMP_SPEC_PARAMETER_UNSUPP, 0);
1338         return;
1339     }
1340     if (comp && comp->u.simple->which == Z_ElementSetNames_generic)
1341         element_set_name = comp->u.simple->u.generic;
1342     Odr_int number_of_records_returned = 0;
1343     int error = 0;
1344     char *addinfo = 0;
1345     Z_Records *records = get_records(
1346         *pr->resultSetStartPoint - 1, *pr->numberOfRecordsRequested,
1347         &error, &addinfo, &number_of_records_returned, odr, m_backend,
1348         pr->preferredRecordSyntax, element_set_name);
1349
1350     apdu_res = odr.create_presentResponse(apdu_req, error, addinfo);
1351     if (records)
1352     {
1353         apdu_res->u.presentResponse->records = records;
1354         apdu_res->u.presentResponse->numberOfRecordsReturned =
1355             odr_intdup(odr, number_of_records_returned);
1356     }
1357     package.response() = apdu_res;
1358 }
1359
1360 void yf::Zoom::Frontend::handle_package(mp::Package &package)
1361 {
1362     Z_GDU *gdu = package.request().get();
1363     if (!gdu)
1364         ;
1365     else if (gdu->which == Z_GDU_Z3950)
1366     {
1367         Z_APDU *apdu_req = gdu->u.z3950;
1368         if (apdu_req->which == Z_APDU_initRequest)
1369         {
1370             mp::odr odr;
1371             package.response() = odr.create_close(
1372                 apdu_req,
1373                 Z_Close_protocolError,
1374                 "double init");
1375         }
1376         else if (apdu_req->which == Z_APDU_searchRequest)
1377         {
1378             handle_search(package);
1379         }
1380         else if (apdu_req->which == Z_APDU_presentRequest)
1381         {
1382             handle_present(package);
1383         }
1384         else
1385         {
1386             mp::odr odr;
1387             package.response() = odr.create_close(
1388                 apdu_req,
1389                 Z_Close_protocolError,
1390                 "zoom filter cannot handle this APDU");
1391             package.session().close();
1392         }
1393     }
1394     else
1395     {
1396         package.session().close();
1397     }
1398 }
1399
1400 void yf::Zoom::Impl::process(mp::Package &package)
1401 {
1402     FrontendPtr f = get_frontend(package);
1403     Z_GDU *gdu = package.request().get();
1404
1405     if (f->m_is_virtual)
1406     {
1407         f->handle_package(package);
1408     }
1409     else if (gdu && gdu->which == Z_GDU_Z3950 && gdu->u.z3950->which ==
1410              Z_APDU_initRequest)
1411     {
1412         Z_InitRequest *req = gdu->u.z3950->u.initRequest;
1413         f->m_init_gdu = gdu;
1414
1415         mp::odr odr;
1416         Z_APDU *apdu = odr.create_initResponse(gdu->u.z3950, 0, 0);
1417         Z_InitResponse *resp = apdu->u.initResponse;
1418
1419         int i;
1420         static const int masks[] = {
1421             Z_Options_search,
1422             Z_Options_present,
1423             -1
1424         };
1425         for (i = 0; masks[i] != -1; i++)
1426             if (ODR_MASK_GET(req->options, masks[i]))
1427                 ODR_MASK_SET(resp->options, masks[i]);
1428
1429         static const int versions[] = {
1430             Z_ProtocolVersion_1,
1431             Z_ProtocolVersion_2,
1432             Z_ProtocolVersion_3,
1433             -1
1434         };
1435         for (i = 0; versions[i] != -1; i++)
1436             if (ODR_MASK_GET(req->protocolVersion, versions[i]))
1437                 ODR_MASK_SET(resp->protocolVersion, versions[i]);
1438             else
1439                 break;
1440
1441         *resp->preferredMessageSize = *req->preferredMessageSize;
1442         *resp->maximumRecordSize = *req->maximumRecordSize;
1443
1444         package.response() = apdu;
1445         f->m_is_virtual = true;
1446     }
1447     else
1448         package.move();
1449
1450     release_frontend(package);
1451 }
1452
1453
1454 static mp::filter::Base* filter_creator()
1455 {
1456     return new mp::filter::Zoom;
1457 }
1458
1459 extern "C" {
1460     struct metaproxy_1_filter_struct metaproxy_1_filter_zoom = {
1461         0,
1462         "zoom",
1463         filter_creator
1464     };
1465 }
1466
1467
1468 /*
1469  * Local variables:
1470  * c-basic-offset: 4
1471  * c-file-style: "Stroustrup"
1472  * indent-tabs-mode: nil
1473  * End:
1474  * vim: shiftwidth=4 tabstop=8 expandtab
1475  */
1476