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         else
 738         {
 739             // user may specify backend authentication for CF target
 740             const char *param_user = 0;
 741             const char *param_password = 0;
 742             char **names;
 743             char **values;
 744             int i;
 745             int no_parms = yaz_uri_to_array(db_args.c_str(),
 746                                             odr, &names, &values);
 747             for (i = 0; i < no_parms; i++)
 748             {
 749                 const char *name = names[i];
 750                 const char *value = values[i];
 751                 if (!strcmp(name, "user"))
 752                     param_user = value;
 753                 else if (!strcmp(name, "password"))
 754                     param_password = value;
 755             }
 756             if (param_user && param_password)
 757             {
 758                 authentication = std::string(param_user)
 759                     + "/" + std::string(param_password);
 760             }
 761         }
 762
 763         if (sptr->cfSubDb.length())
 764         {
 765             if (db_args.length())
 766                 db_args += "&";
 767             db_args += "subdatabase=" + mp::util::uri_encode(sptr->cfSubDb);
 768         }
 769     }
 770     else
 771     {
 772         // A non-CF target
 773         if (db_args.length())
 774         {
 775             // user has specified backend authentication
 776             const char *param_user = 0;
 777             const char *param_password = 0;
 778             char **names;
 779             char **values;
 780             int i;
 781             int no_parms = yaz_uri_to_array(db_args.c_str(),
 782                                             odr, &names, &values);
 783             for (i = 0; i < no_parms; i++)
 784             {
 785                 const char *name = names[i];
 786                 const char *value = values[i];
 787                 if (!strcmp(name, "user"))
 788                     param_user = value;
 789                 else if (!strcmp(name, "password"))
 790                     param_password = value;
 791                 else if (!strcmp(name, "proxy"))
 792                     sru_proxy = value;
 793                 else
 794                 {
 795                     BackendPtr notfound;
 796                     char *msg = (char*) odr_malloc(odr, strlen(name) + 30);
 797                     *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 798                     sprintf(msg, "Bad database argument: %s", name);
 799                     *addinfo = msg;
 800                     return notfound;
 801                 }
 802             }
 803             if (param_user && param_password)
 804             {
 805                 authentication = std::string(param_user)
 806                     + "/" + std::string(param_password);
 807             }
 808             db_args.clear(); // no arguments to be passed (non-CF)
 809         }
 810         if (authentication.length())
 811             b->set_option("user", authentication.c_str());
 812     }
 813
 814     if (sru_proxy)
 815         b->set_option("proxy", sru_proxy);
 816
 817     if (b->sptr->contentConnector.length())
 818     {
 819         int fd;
 820
 821         char *fname = (char *) xmalloc(m_p->content_tmp_file.length() + 8);
 822         strcpy(fname, m_p->content_tmp_file.c_str());
 823         strcat(fname, "XXXXXX");
 824         fd = mkstemp(fname);
 825
 826         if (fd == -1)
 827         {
 828             yaz_log(YLOG_WARN|YLOG_ERRNO, "create %s", fname);
 829             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 830             *addinfo = (char *)  odr_malloc(odr, 40 + strlen(fname));
 831             sprintf(*addinfo, "Could not create %s", fname);
 832             xfree(fname);
 833             BackendPtr backend_null;
 834             return backend_null;
 835         }
 836         b->content_session_id.assign(fname + (strlen(fname) - 6));
 837         WRBUF w = wrbuf_alloc();
 838         wrbuf_puts(w, "#content_proxy\n");
 839         if (authentication.length())
 840             wrbuf_printf(w, "authentication: %s\n", authentication.c_str());
 841         if (sru_proxy)
 842             wrbuf_printf(w, "proxy: %s\n", sru_proxy);
 843         if (sptr->cfAuth.length())
 844             wrbuf_printf(w, "cfauth: %s\n", sptr->cfAuth.c_str());
 845         if (sptr->cfProxy.length())
 846             wrbuf_printf(w, "cfproxy: %s\n", sptr->cfProxy.c_str());
 847
 848         write(fd, wrbuf_buf(w), wrbuf_len(w));
 849         close(fd);
 850         yaz_log(YLOG_LOG, "file %s created\n", fname);
 851         xfree(fname);
 852     }
 853
 854
 855     std::string url;
 856     if (sptr->sru.length())
 857     {
 858         url = "http://" + sptr->target;
 859         b->set_option("sru", sptr->sru.c_str());
 860     }
 861     else
 862     {
 863         url = sptr->target;
 864     }
 865     if (db_args.length())
 866         url += "," + db_args;
 867     yaz_log(YLOG_LOG, "url=%s", url.c_str());
 868     b->connect(url, error, addinfo, odr);
 869     if (*error == 0)
 870     {
 871         m_backend = b;
 872     }
 873     return b;
 874 }
 875
 876 Z_Records *yf::Zoom::Frontend::get_records(Odr_int start,
 877                                            Odr_int number_to_present,
 878                                            int *error,
 879                                            char **addinfo,
 880                                            Odr_int *number_of_records_returned,
 881                                            ODR odr,
 882                                            BackendPtr b,
 883                                            Odr_oid *preferredRecordSyntax,
 884                                            const char *element_set_name)
 885 {
 886     *number_of_records_returned = 0;
 887     Z_Records *records = 0;
 888     bool enable_pz2_retrieval = false; // whether target profile is used
 889     bool enable_pz2_transform = false; // whether XSLT is used as well
 890     bool assume_marc8_charset = false;
 891
 892     if (start < 0 || number_to_present <= 0)
 893         return records;
 894
 895     if (number_to_present > 10000)
 896         number_to_present = 10000;
 897
 898     ZOOM_record *recs = (ZOOM_record *)
 899         odr_malloc(odr, number_to_present * sizeof(*recs));
 900
 901     char oid_name_str[OID_STR_MAX];
 902     const char *syntax_name = 0;
 903
 904     if (preferredRecordSyntax &&
 905         !oid_oidcmp(preferredRecordSyntax, yaz_oid_recsyn_xml)
 906         && element_set_name)
 907     {
 908         if (!strcmp(element_set_name, m_p->element_transform.c_str()))
 909         {
 910             enable_pz2_retrieval = true;
 911             enable_pz2_transform = true;
 912         }
 913         else if (!strcmp(element_set_name, m_p->element_raw.c_str()))
 914         {
 915             enable_pz2_retrieval = true;
 916         }
 917     }
 918
 919     if (enable_pz2_retrieval)
 920     {
 921         if (b->sptr->request_syntax.length())
 922         {
 923             syntax_name = b->sptr->request_syntax.c_str();
 924             const Odr_oid *syntax_oid =
 925                 yaz_string_to_oid(yaz_oid_std(), CLASS_RECSYN, syntax_name);
 926             if (!oid_oidcmp(syntax_oid, yaz_oid_recsyn_usmarc)
 927                 || !oid_oidcmp(syntax_oid, yaz_oid_recsyn_opac))
 928                 assume_marc8_charset = true;
 929         }
 930     }
 931     else if (preferredRecordSyntax)
 932         syntax_name =
 933             yaz_oid_to_string_buf(preferredRecordSyntax, 0, oid_name_str);
 934
 935     b->set_option("preferredRecordSyntax", syntax_name);
 936
 937     if (enable_pz2_retrieval)
 938     {
 939         element_set_name = 0;
 940         if (b->sptr->element_set.length())
 941             element_set_name = b->sptr->element_set.c_str();
 942     }
 943
 944     b->set_option("elementSetName", element_set_name);
 945
 946     b->present(start, number_to_present, recs, error, addinfo, odr);
 947
 948     Odr_int i = 0;
 949     if (!*error)
 950     {
 951         for (i = 0; i < number_to_present; i++)
 952             if (!recs[i])
 953                 break;
 954     }
 955     if (i > 0)
 956     {  // only return records if no error and at least one record
 957         char *odr_database = odr_strdup(odr,
 958                                         b->m_frontend_database.c_str());
 959         Z_NamePlusRecordList *npl = (Z_NamePlusRecordList *)
 960             odr_malloc(odr, sizeof(*npl));
 961         *number_of_records_returned = i;
 962         npl->num_records = i;
 963         npl->records = (Z_NamePlusRecord **)
 964             odr_malloc(odr, i * sizeof(*npl->records));
 965         for (i = 0; i < number_to_present; i++)
 966         {
 967             Z_NamePlusRecord *npr = 0;
 968             const char *addinfo;
 969             int sur_error = ZOOM_record_error(recs[i], 0 /* msg */,
 970                                               &addinfo, 0 /* diagset */);
 971
 972             if (sur_error)
 973             {
 974                 npr = zget_surrogateDiagRec(odr, odr_database, sur_error,
 975                                             addinfo);
 976             }
 977             else if (enable_pz2_retrieval)
 978             {
 979                 char rec_type_str[100];
 980                 const char *record_encoding = 0;
 981
 982                 if (b->sptr->record_encoding.length())
 983                     record_encoding = b->sptr->record_encoding.c_str();
 984                 else if (assume_marc8_charset)
 985                     record_encoding = "marc8";
 986
 987                 strcpy(rec_type_str, b->sptr->use_turbomarc ? "txml" : "xml");
 988                 if (record_encoding)
 989                 {
 990                     strcat(rec_type_str, "; charset=");
 991                     strcat(rec_type_str, record_encoding);
 992                 }
 993
 994                 int rec_len;
 995                 xmlChar *xmlrec_buf = 0;
 996                 const char *rec_buf = ZOOM_record_get(recs[i], rec_type_str,
 997                                                       &rec_len);
 998                 if (rec_buf && b->xsp && enable_pz2_transform)
 999                 {
1000                     xmlDoc *rec_doc = xmlParseMemory(rec_buf, rec_len);
1001                     if (rec_doc)
1002                     {
1003                         xmlDoc *rec_res;
1004                         rec_res = xsltApplyStylesheet(b->xsp, rec_doc, 0);
1005
1006                         if (rec_res)
1007                             xsltSaveResultToString(&xmlrec_buf, &rec_len,
1008                                                    rec_res, b->xsp);
1009                         rec_buf = (const char *) xmlrec_buf;
1010                         xmlFreeDoc(rec_doc);
1011                         xmlFreeDoc(rec_res);
1012                     }
1013                 }
1014
1015                 if (rec_buf)
1016                 {
1017                     xmlDoc *doc = xmlParseMemory(rec_buf, rec_len);
1018                     std::string res =
1019                         mp::xml::url_recipe_handle(doc, b->sptr->urlRecipe);
1020                     if (res.length() && b->content_session_id.length())
1021                     {
1022                         size_t off = res.find_first_of("://");
1023                         if (off != std::string::npos)
1024                         {
1025                             char tmp[1024];
1026                             sprintf(tmp, "%s.%s/",
1027                                     b->content_session_id.c_str(),
1028                                     m_p->content_proxy_server.c_str());
1029                             res.insert(off + 3, tmp);
1030                         }
1031                     }
1032                     if (res.length())
1033                     {
1034                         xmlNode *ptr = xmlDocGetRootElement(doc);
1035                         while (ptr && ptr->type != XML_ELEMENT_NODE)
1036                             ptr = ptr->next;
1037                         xmlNode *c =
1038                             xmlNewChild(ptr, 0, BAD_CAST "generated-url", 0);
1039                         xmlNode * t = xmlNewText(BAD_CAST res.c_str());
1040                         xmlAddChild(c, t);
1041
1042                         if (xmlrec_buf)
1043                             xmlFree(xmlrec_buf);
1044
1045                         xmlDocDumpMemory(doc, &xmlrec_buf, &rec_len);
1046                         rec_buf = (const char *) xmlrec_buf;
1047                     }
1048                     xmlFreeDoc(doc);
1049                 }
1050                 if (rec_buf)
1051                 {
1052                     npr = (Z_NamePlusRecord *) odr_malloc(odr, sizeof(*npr));
1053                     npr->databaseName = odr_database;
1054                     npr->which = Z_NamePlusRecord_databaseRecord;
1055                     npr->u.databaseRecord =
1056                         z_ext_record_xml(odr, rec_buf, rec_len);
1057                 }
1058                 else
1059                 {
1060                     npr = zget_surrogateDiagRec(
1061                         odr, odr_database,
1062                         YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS,
1063                         rec_type_str);
1064                 }
1065                 if (xmlrec_buf)
1066                     xmlFree(xmlrec_buf);
1067             }
1068             else
1069             {
1070                 Z_External *ext =
1071                     (Z_External *) ZOOM_record_get(recs[i], "ext", 0);
1072                 if (ext)
1073                 {
1074                     npr = (Z_NamePlusRecord *) odr_malloc(odr, sizeof(*npr));
1075                     npr->databaseName = odr_database;
1076                     npr->which = Z_NamePlusRecord_databaseRecord;
1077                     npr->u.databaseRecord = ext;
1078                 }
1079                 else
1080                 {
1081                     npr = zget_surrogateDiagRec(
1082                         odr, odr_database,
1083                         YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS,
1084                         "ZOOM_record, type ext");
1085                 }
1086             }
1087             npl->records[i] = npr;
1088         }
1089         records = (Z_Records*) odr_malloc(odr, sizeof(*records));
1090         records->which = Z_Records_DBOSD;
1091         records->u.databaseOrSurDiagnostics = npl;
1092     }
1093     return records;
1094 }
1095
1096 struct cql_node *yf::Zoom::Impl::convert_cql_fields(struct cql_node *cn,
1097                                                     ODR odr)
1098 {
1099     struct cql_node *r = 0;
1100     if (!cn)
1101         return 0;
1102     switch (cn->which)
1103     {
1104     case CQL_NODE_ST:
1105         if (cn->u.st.index)
1106         {
1107             std::map<std::string,std::string>::const_iterator it;
1108             it = fieldmap.find(cn->u.st.index);
1109             if (it == fieldmap.end())
1110                 return cn;
1111             if (it->second.length())
1112                 cn->u.st.index = odr_strdup(odr, it->second.c_str());
1113             else
1114                 cn->u.st.index = 0;
1115         }
1116         break;
1117     case CQL_NODE_BOOL:
1118         r = convert_cql_fields(cn->u.boolean.left, odr);
1119         if (!r)
1120             r = convert_cql_fields(cn->u.boolean.right, odr);
1121         break;
1122     case CQL_NODE_SORT:
1123         r = convert_cql_fields(cn->u.sort.search, odr);
1124         break;
1125     }
1126     return r;
1127 }
1128
1129 void yf::Zoom::Frontend::handle_search(mp::Package &package)
1130 {
1131     Z_GDU *gdu = package.request().get();
1132     Z_APDU *apdu_req = gdu->u.z3950;
1133     Z_APDU *apdu_res = 0;
1134     mp::odr odr;
1135     Z_SearchRequest *sr = apdu_req->u.searchRequest;
1136     if (sr->num_databaseNames != 1)
1137     {
1138         apdu_res = odr.create_searchResponse(
1139             apdu_req, YAZ_BIB1_TOO_MANY_DATABASES_SPECIFIED, 0);
1140         package.response() = apdu_res;
1141         return;
1142     }
1143
1144     int error = 0;
1145     char *addinfo = 0;
1146     std::string db(sr->databaseNames[0]);
1147     BackendPtr b = get_backend_from_databases(db, &error, &addinfo, odr);
1148     if (error)
1149     {
1150         apdu_res =
1151             odr.create_searchResponse(apdu_req, error, addinfo);
1152         package.response() = apdu_res;
1153         return;
1154     }
1155
1156     b->set_option("setname", "default");
1157
1158     Odr_int hits = 0;
1159     Z_Query *query = sr->query;
1160     WRBUF ccl_wrbuf = 0;
1161     WRBUF pqf_wrbuf = 0;
1162
1163     if (query->which == Z_Query_type_1 || query->which == Z_Query_type_101)
1164     {
1165         // RPN
1166         pqf_wrbuf = wrbuf_alloc();
1167         yaz_rpnquery_to_wrbuf(pqf_wrbuf, query->u.type_1);
1168     }
1169     else if (query->which == Z_Query_type_2)
1170     {
1171         // CCL
1172         ccl_wrbuf = wrbuf_alloc();
1173         wrbuf_write(ccl_wrbuf, (const char *) query->u.type_2->buf,
1174                     query->u.type_2->len);
1175     }
1176     else if (query->which == Z_Query_type_104 &&
1177              query->u.type_104->which == Z_External_CQL)
1178     {
1179         // CQL
1180         const char *cql = query->u.type_104->u.cql;
1181         CQL_parser cp = cql_parser_create();
1182         int r = cql_parser_string(cp, cql);
1183         if (r)
1184         {
1185             cql_parser_destroy(cp);
1186             apdu_res =
1187                 odr.create_searchResponse(apdu_req,
1188                                           YAZ_BIB1_MALFORMED_QUERY,
1189                                           "CQL syntax error");
1190             package.response() = apdu_res;
1191             return;
1192         }
1193         struct cql_node *cn = cql_parser_result(cp);
1194         struct cql_node *cn_error = m_p->convert_cql_fields(cn, odr);
1195         if (cn_error)
1196         {
1197             // hopefully we are getting a ptr to a index+relation+term node
1198             addinfo = 0;
1199             if (cn_error->which == CQL_NODE_ST)
1200                 addinfo = cn_error->u.st.index;
1201
1202             apdu_res =
1203                 odr.create_searchResponse(apdu_req,
1204                                           YAZ_BIB1_UNSUPP_USE_ATTRIBUTE,
1205                                           addinfo);
1206             package.response() = apdu_res;
1207             return;
1208         }
1209         char ccl_buf[1024];
1210
1211         r = cql_to_ccl_buf(cn, ccl_buf, sizeof(ccl_buf));
1212         if (r == 0)
1213         {
1214             ccl_wrbuf = wrbuf_alloc();
1215             wrbuf_puts(ccl_wrbuf, ccl_buf);
1216         }
1217         cql_parser_destroy(cp);
1218         if (r)
1219         {
1220             apdu_res =
1221                 odr.create_searchResponse(apdu_req,
1222                                           YAZ_BIB1_MALFORMED_QUERY,
1223                                           "CQL to CCL conversion error");
1224             package.response() = apdu_res;
1225             return;
1226         }
1227     }
1228     else
1229     {
1230         apdu_res =
1231             odr.create_searchResponse(apdu_req, YAZ_BIB1_QUERY_TYPE_UNSUPP, 0);
1232         package.response() = apdu_res;
1233         return;
1234     }
1235
1236     if (ccl_wrbuf)
1237     {
1238         // CCL to PQF
1239         assert(pqf_wrbuf == 0);
1240         int cerror, cpos;
1241         struct ccl_rpn_node *cn;
1242         yaz_log(YLOG_LOG, "CCL: %s", wrbuf_cstr(ccl_wrbuf));
1243         cn = ccl_find_str(b->sptr->ccl_bibset, wrbuf_cstr(ccl_wrbuf),
1244                           &cerror, &cpos);
1245         wrbuf_destroy(ccl_wrbuf);
1246         if (!cn)
1247         {
1248             char *addinfo = odr_strdup(odr, ccl_err_msg(cerror));
1249             int z3950_diag = YAZ_BIB1_MALFORMED_QUERY;
1250
1251             switch (cerror)
1252             {
1253             case CCL_ERR_UNKNOWN_QUAL:
1254                 z3950_diag = YAZ_BIB1_UNSUPP_USE_ATTRIBUTE;
1255                 break;
1256             case CCL_ERR_TRUNC_NOT_LEFT:
1257             case CCL_ERR_TRUNC_NOT_RIGHT:
1258             case CCL_ERR_TRUNC_NOT_BOTH:
1259                 z3950_diag = YAZ_BIB1_UNSUPP_TRUNCATION_ATTRIBUTE;
1260                 break;
1261             }
1262             apdu_res =
1263                 odr.create_searchResponse(apdu_req, z3950_diag, addinfo);
1264             package.response() = apdu_res;
1265             return;
1266         }
1267         pqf_wrbuf = wrbuf_alloc();
1268         ccl_pquery(pqf_wrbuf, cn);
1269         ccl_rpn_delete(cn);
1270     }
1271
1272     assert(pqf_wrbuf);
1273     if (b->get_option("sru"))
1274     {
1275         int status = 0;
1276         Z_RPNQuery *zquery;
1277         zquery = p_query_rpn(odr, wrbuf_cstr(pqf_wrbuf));
1278         WRBUF wrb = wrbuf_alloc();
1279
1280         if (!strcmp(b->get_option("sru"), "solr"))
1281         {
1282             solr_transform_t cqlt = solr_transform_create();
1283
1284             status = solr_transform_rpn2solr_wrbuf(cqlt, wrb, zquery);
1285
1286             solr_transform_close(cqlt);
1287         }
1288         else
1289         {
1290             cql_transform_t cqlt = cql_transform_create();
1291
1292             status = cql_transform_rpn2cql_wrbuf(cqlt, wrb, zquery);
1293
1294             cql_transform_close(cqlt);
1295         }
1296         if (status == 0)
1297         {
1298             yaz_log(YLOG_LOG, "search CQL: %s", wrbuf_cstr(wrb));
1299             b->search_cql(wrbuf_cstr(wrb), &hits, &error, &addinfo, odr);
1300         }
1301
1302         wrbuf_destroy(wrb);
1303         wrbuf_destroy(pqf_wrbuf);
1304         if (status)
1305         {
1306             apdu_res =
1307                 odr.create_searchResponse(apdu_req, YAZ_BIB1_MALFORMED_QUERY,
1308                                           "can not convert from RPN to CQL/SOLR");
1309             package.response() = apdu_res;
1310             return;
1311         }
1312     }
1313     else
1314     {
1315         yaz_log(YLOG_LOG, "search PQF: %s", wrbuf_cstr(pqf_wrbuf));
1316         b->search_pqf(wrbuf_cstr(pqf_wrbuf), &hits, &error, &addinfo, odr);
1317         wrbuf_destroy(pqf_wrbuf);
1318     }
1319
1320
1321     const char *element_set_name = 0;
1322     Odr_int number_to_present = 0;
1323     if (!error)
1324         mp::util::piggyback_sr(sr, hits, number_to_present, &element_set_name);
1325
1326     Odr_int number_of_records_returned = 0;
1327     Z_Records *records = get_records(
1328         0, number_to_present, &error, &addinfo,
1329         &number_of_records_returned, odr, b, sr->preferredRecordSyntax,
1330         element_set_name);
1331     apdu_res = odr.create_searchResponse(apdu_req, error, addinfo);
1332     if (records)
1333     {
1334         apdu_res->u.searchResponse->records = records;
1335         apdu_res->u.searchResponse->numberOfRecordsReturned =
1336             odr_intdup(odr, number_of_records_returned);
1337     }
1338     apdu_res->u.searchResponse->resultCount = odr_intdup(odr, hits);
1339     package.response() = apdu_res;
1340 }
1341
1342 void yf::Zoom::Frontend::handle_present(mp::Package &package)
1343 {
1344     Z_GDU *gdu = package.request().get();
1345     Z_APDU *apdu_req = gdu->u.z3950;
1346     Z_APDU *apdu_res = 0;
1347     Z_PresentRequest *pr = apdu_req->u.presentRequest;
1348
1349     mp::odr odr;
1350     if (!m_backend)
1351     {
1352         package.response() = odr.create_presentResponse(
1353             apdu_req, YAZ_BIB1_SPECIFIED_RESULT_SET_DOES_NOT_EXIST, 0);
1354         return;
1355     }
1356     const char *element_set_name = 0;
1357     Z_RecordComposition *comp = pr->recordComposition;
1358     if (comp && comp->which != Z_RecordComp_simple)
1359     {
1360         package.response() = odr.create_presentResponse(
1361             apdu_req,
1362             YAZ_BIB1_PRESENT_COMP_SPEC_PARAMETER_UNSUPP, 0);
1363         return;
1364     }
1365     if (comp && comp->u.simple->which == Z_ElementSetNames_generic)
1366         element_set_name = comp->u.simple->u.generic;
1367     Odr_int number_of_records_returned = 0;
1368     int error = 0;
1369     char *addinfo = 0;
1370     Z_Records *records = get_records(
1371         *pr->resultSetStartPoint - 1, *pr->numberOfRecordsRequested,
1372         &error, &addinfo, &number_of_records_returned, odr, m_backend,
1373         pr->preferredRecordSyntax, element_set_name);
1374
1375     apdu_res = odr.create_presentResponse(apdu_req, error, addinfo);
1376     if (records)
1377     {
1378         apdu_res->u.presentResponse->records = records;
1379         apdu_res->u.presentResponse->numberOfRecordsReturned =
1380             odr_intdup(odr, number_of_records_returned);
1381     }
1382     package.response() = apdu_res;
1383 }
1384
1385 void yf::Zoom::Frontend::handle_package(mp::Package &package)
1386 {
1387     Z_GDU *gdu = package.request().get();
1388     if (!gdu)
1389         ;
1390     else if (gdu->which == Z_GDU_Z3950)
1391     {
1392         Z_APDU *apdu_req = gdu->u.z3950;
1393         if (apdu_req->which == Z_APDU_initRequest)
1394         {
1395             mp::odr odr;
1396             package.response() = odr.create_close(
1397                 apdu_req,
1398                 Z_Close_protocolError,
1399                 "double init");
1400         }
1401         else if (apdu_req->which == Z_APDU_searchRequest)
1402         {
1403             handle_search(package);
1404         }
1405         else if (apdu_req->which == Z_APDU_presentRequest)
1406         {
1407             handle_present(package);
1408         }
1409         else
1410         {
1411             mp::odr odr;
1412             package.response() = odr.create_close(
1413                 apdu_req,
1414                 Z_Close_protocolError,
1415                 "zoom filter cannot handle this APDU");
1416             package.session().close();
1417         }
1418     }
1419     else
1420     {
1421         package.session().close();
1422     }
1423 }
1424
1425 void yf::Zoom::Impl::process(mp::Package &package)
1426 {
1427     FrontendPtr f = get_frontend(package);
1428     Z_GDU *gdu = package.request().get();
1429
1430     if (f->m_is_virtual)
1431     {
1432         f->handle_package(package);
1433     }
1434     else if (gdu && gdu->which == Z_GDU_Z3950 && gdu->u.z3950->which ==
1435              Z_APDU_initRequest)
1436     {
1437         Z_InitRequest *req = gdu->u.z3950->u.initRequest;
1438         f->m_init_gdu = gdu;
1439
1440         mp::odr odr;
1441         Z_APDU *apdu = odr.create_initResponse(gdu->u.z3950, 0, 0);
1442         Z_InitResponse *resp = apdu->u.initResponse;
1443
1444         int i;
1445         static const int masks[] = {
1446             Z_Options_search,
1447             Z_Options_present,
1448             -1
1449         };
1450         for (i = 0; masks[i] != -1; i++)
1451             if (ODR_MASK_GET(req->options, masks[i]))
1452                 ODR_MASK_SET(resp->options, masks[i]);
1453
1454         static const int versions[] = {
1455             Z_ProtocolVersion_1,
1456             Z_ProtocolVersion_2,
1457             Z_ProtocolVersion_3,
1458             -1
1459         };
1460         for (i = 0; versions[i] != -1; i++)
1461             if (ODR_MASK_GET(req->protocolVersion, versions[i]))
1462                 ODR_MASK_SET(resp->protocolVersion, versions[i]);
1463             else
1464                 break;
1465
1466         *resp->preferredMessageSize = *req->preferredMessageSize;
1467         *resp->maximumRecordSize = *req->maximumRecordSize;
1468
1469         package.response() = apdu;
1470         f->m_is_virtual = true;
1471     }
1472     else
1473         package.move();
1474
1475     release_frontend(package);
1476 }
1477
1478
1479 static mp::filter::Base* filter_creator()
1480 {
1481     return new mp::filter::Zoom;
1482 }
1483
1484 extern "C" {
1485     struct metaproxy_1_filter_struct metaproxy_1_filter_zoom = {
1486         0,
1487         "zoom",
1488         filter_creator
1489     };
1490 }
1491
1492
1493 /*
1494  * Local variables:
1495  * c-basic-offset: 4
1496  * c-file-style: "Stroustrup"
1497  * indent-tabs-mode: nil
1498  * End:
1499  * vim: shiftwidth=4 tabstop=8 expandtab
1500  */
1501