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     std::string db_args;
 599     std::string torus_db;
 600     size_t db_arg_pos = database.find(',');
 601     if (db_arg_pos != std::string::npos)
 602     {
 603         torus_db = database.substr(0, db_arg_pos);
 604         db_args = database.substr(db_arg_pos + 1);
 605     }
 606     else
 607         torus_db = database;
 608
 609     SearchablePtr sptr;
 610
 611     std::map<std::string,SearchablePtr>::iterator it;
 612     it = m_p->s_map.find(torus_db);
 613     if (it != m_p->s_map.end())
 614         sptr = it->second;
 615     else
 616     {
 617         xmlDoc *doc = mp::get_searchable(m_p->torus_url, torus_db);
 618         if (!doc)
 619         {
 620             *error = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
 621             *addinfo = odr_strdup(odr, database.c_str());
 622             BackendPtr b;
 623             return b;
 624         }
 625         const xmlNode *ptr = xmlDocGetRootElement(doc);
 626         if (ptr)
 627         {   // presumably ptr is a records element node
 628             // parse first record in document
 629             for (ptr = ptr->children; ptr; ptr = ptr->next)
 630             {
 631                 if (ptr->type == XML_ELEMENT_NODE
 632                     && !strcmp((const char *) ptr->name, "record"))
 633                 {
 634                     sptr = m_p->parse_torus_record(ptr);
 635                     break;
 636                 }
 637             }
 638         }
 639         xmlFreeDoc(doc);
 640     }
 641
 642     if (!sptr)
 643     {
 644         *error = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
 645         *addinfo = odr_strdup(odr, database.c_str());
 646         BackendPtr b;
 647         return b;
 648     }
 649
 650     xsltStylesheetPtr xsp = 0;
 651     if (sptr->transform_xsl_fname.length())
 652     {
 653         const char *path = 0;
 654
 655         if (m_p->xsldir.length())
 656             path = m_p->xsldir.c_str();
 657         else
 658             path = m_p->file_path.c_str();
 659         std::string fname;
 660
 661         char fullpath[1024];
 662         char *cp = yaz_filepath_resolve(sptr->transform_xsl_fname.c_str(),
 663                                         path, 0, fullpath);
 664         if (cp)
 665             fname.assign(cp);
 666         else
 667         {
 668             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 669             *addinfo = (char *)
 670                 odr_malloc(odr, 40 + sptr->transform_xsl_fname.length());
 671             sprintf(*addinfo, "File could not be read: %s",
 672                     sptr->transform_xsl_fname.c_str());
 673             BackendPtr b;
 674             return b;
 675         }
 676         xmlDoc *xsp_doc = xmlParseFile(fname.c_str());
 677         if (!xsp_doc)
 678         {
 679             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 680             *addinfo = (char *) odr_malloc(odr, 40 + fname.length());
 681             sprintf(*addinfo, "xmlParseFile failed. File: %s", fname.c_str());
 682             BackendPtr b;
 683             return b;
 684         }
 685         xsp = xsltParseStylesheetDoc(xsp_doc);
 686         if (!xsp)
 687         {
 688             *error = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
 689             *addinfo = odr_strdup(odr, "xsltParseStylesheetDoc failed");
 690             BackendPtr b;
 691             xmlFreeDoc(xsp_doc);
 692             return b;
 693         }
 694     }
 695
 696     m_backend.reset();
 697
 698     BackendPtr b(new Backend(sptr));
 699
 700     b->xsp = xsp;
 701     b->m_frontend_database = database;
 702
 703     if (sptr->query_encoding.length())
 704         b->set_option("rpnCharset", sptr->query_encoding.c_str());
 705
 706     b->set_option("timeout", "40");
 707
 708
 709     std::string authentication = sptr->authentication;
 710     std::string proxy = sptr->cfProxy;
 711
 712     const char *param_user = 0;
 713     const char *param_password = 0;
 714     const char *param_proxy = 0;
 715     if (db_args.length())
 716     {
 717         char **names;
 718         char **values;
 719         int i;
 720         int no_parms = yaz_uri_to_array(db_args.c_str(),
 721                                         odr, &names, &values);
 722         for (i = 0; i < no_parms; i++)
 723         {
 724             const char *name = names[i];
 725             const char *value = values[i];
 726             if (!strcmp(name, "user"))
 727                 param_user = value;
 728             else if (!strcmp(name, "password"))
 729                 param_password = value;
 730             else if (!strcmp(name, "proxy"))
 731                 param_proxy = value;
 732             else
 733             {
 734                 BackendPtr notfound;
 735                 char *msg = (char*) odr_malloc(odr, strlen(name) + 30);
 736                 *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 737                 sprintf(msg, "Bad database argument: %s", name);
 738                 *addinfo = msg;
 739                 return notfound;
 740             }
 741         }
 742         if (param_user && param_password)
 743         {
 744             authentication = std::string(param_user)
 745                 + "/" + std::string(param_password);
 746         }
 747         if (param_proxy)
 748             proxy = param_proxy;
 749     }
 750
 751     if (sptr->cfAuth.length())
 752     {
 753         // A CF target
 754         b->set_option("user", sptr->cfAuth.c_str());
 755         if (!param_user && !param_password && authentication.length())
 756         {
 757             if (db_args.length())
 758                 db_args += "&";
 759             // no database (auth) args specified already.. and the
 760             // Torus authentication has it.. Generate the args that CF
 761             // understands..
 762             size_t found = authentication.find('/');
 763             if (found != std::string::npos)
 764             {
 765                 db_args += "user=" +
 766                     mp::util::uri_encode(authentication.substr(0, found))
 767                     + "&password=" +
 768                     mp::util::uri_encode(authentication.substr(found+1));
 769             }
 770             else
 771                 db_args += "user=" + mp::util::uri_encode(authentication);
 772         }
 773         if (!param_proxy && proxy.length())
 774         {
 775             if (db_args.length())
 776                 db_args += "&";
 777             db_args += "proxy=" + mp::util::uri_encode(proxy);
 778         }
 779         if (sptr->cfSubDb.length())
 780         {
 781             if (db_args.length())
 782                 db_args += "&";
 783             db_args += "subdatabase=" + mp::util::uri_encode(sptr->cfSubDb);
 784         }
 785     }
 786     else
 787     {
 788         db_args.clear(); // no arguments to be passed (non-CF)
 789
 790         if (authentication.length())
 791             b->set_option("user", authentication.c_str());
 792         if (proxy.length())
 793             b->set_option("proxy", proxy.c_str());
 794     }
 795     if (b->sptr->contentConnector.length())
 796     {
 797         int fd;
 798
 799         char *fname = (char *) xmalloc(m_p->content_tmp_file.length() + 8);
 800         strcpy(fname, m_p->content_tmp_file.c_str());
 801         strcat(fname, "XXXXXX");
 802         fd = mkstemp(fname);
 803
 804         if (fd == -1)
 805         {
 806             yaz_log(YLOG_WARN|YLOG_ERRNO, "create %s", fname);
 807             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 808             *addinfo = (char *)  odr_malloc(odr, 40 + strlen(fname));
 809             sprintf(*addinfo, "Could not create %s", fname);
 810             xfree(fname);
 811             BackendPtr backend_null;
 812             return backend_null;
 813         }
 814         b->content_session_id.assign(fname + (strlen(fname) - 6));
 815         WRBUF w = wrbuf_alloc();
 816         wrbuf_puts(w, "#content_proxy\n");
 817         if (authentication.length())
 818             wrbuf_printf(w, "authentication: %s\n", authentication.c_str());
 819         if (proxy.length())
 820             wrbuf_printf(w, "proxy: %s\n", proxy.c_str());
 821         if (sptr->cfAuth.length())
 822             wrbuf_printf(w, "cfauth: %s\n", sptr->cfAuth.c_str());
 823         if (sptr->cfProxy.length())
 824             wrbuf_printf(w, "cfproxy: %s\n", sptr->cfProxy.c_str());
 825
 826         write(fd, wrbuf_buf(w), wrbuf_len(w));
 827         close(fd);
 828         yaz_log(YLOG_LOG, "file %s created\n", fname);
 829         xfree(fname);
 830     }
 831
 832
 833     std::string url;
 834     if (sptr->sru.length())
 835     {
 836         url = "http://" + sptr->target;
 837         b->set_option("sru", sptr->sru.c_str());
 838     }
 839     else
 840     {
 841         url = sptr->target;
 842     }
 843     if (db_args.length())
 844         url += "," + db_args;
 845     yaz_log(YLOG_LOG, "url=%s", url.c_str());
 846     b->connect(url, error, addinfo, odr);
 847     if (*error == 0)
 848     {
 849         m_backend = b;
 850     }
 851     return b;
 852 }
 853
 854 Z_Records *yf::Zoom::Frontend::get_records(Odr_int start,
 855                                            Odr_int number_to_present,
 856                                            int *error,
 857                                            char **addinfo,
 858                                            Odr_int *number_of_records_returned,
 859                                            ODR odr,
 860                                            BackendPtr b,
 861                                            Odr_oid *preferredRecordSyntax,
 862                                            const char *element_set_name)
 863 {
 864     *number_of_records_returned = 0;
 865     Z_Records *records = 0;
 866     bool enable_pz2_retrieval = false; // whether target profile is used
 867     bool enable_pz2_transform = false; // whether XSLT is used as well
 868     bool assume_marc8_charset = false;
 869
 870     if (start < 0 || number_to_present <= 0)
 871         return records;
 872
 873     if (number_to_present > 10000)
 874         number_to_present = 10000;
 875
 876     ZOOM_record *recs = (ZOOM_record *)
 877         odr_malloc(odr, number_to_present * sizeof(*recs));
 878
 879     char oid_name_str[OID_STR_MAX];
 880     const char *syntax_name = 0;
 881
 882     if (preferredRecordSyntax &&
 883         !oid_oidcmp(preferredRecordSyntax, yaz_oid_recsyn_xml)
 884         && element_set_name)
 885     {
 886         if (!strcmp(element_set_name, m_p->element_transform.c_str()))
 887         {
 888             enable_pz2_retrieval = true;
 889             enable_pz2_transform = true;
 890         }
 891         else if (!strcmp(element_set_name, m_p->element_raw.c_str()))
 892         {
 893             enable_pz2_retrieval = true;
 894         }
 895     }
 896
 897     if (enable_pz2_retrieval)
 898     {
 899         if (b->sptr->request_syntax.length())
 900         {
 901             syntax_name = b->sptr->request_syntax.c_str();
 902             const Odr_oid *syntax_oid =
 903                 yaz_string_to_oid(yaz_oid_std(), CLASS_RECSYN, syntax_name);
 904             if (!oid_oidcmp(syntax_oid, yaz_oid_recsyn_usmarc)
 905                 || !oid_oidcmp(syntax_oid, yaz_oid_recsyn_opac))
 906                 assume_marc8_charset = true;
 907         }
 908     }
 909     else if (preferredRecordSyntax)
 910         syntax_name =
 911             yaz_oid_to_string_buf(preferredRecordSyntax, 0, oid_name_str);
 912
 913     b->set_option("preferredRecordSyntax", syntax_name);
 914
 915     if (enable_pz2_retrieval)
 916     {
 917         element_set_name = 0;
 918         if (b->sptr->element_set.length())
 919             element_set_name = b->sptr->element_set.c_str();
 920     }
 921
 922     b->set_option("elementSetName", element_set_name);
 923
 924     b->present(start, number_to_present, recs, error, addinfo, odr);
 925
 926     Odr_int i = 0;
 927     if (!*error)
 928     {
 929         for (i = 0; i < number_to_present; i++)
 930             if (!recs[i])
 931                 break;
 932     }
 933     if (i > 0)
 934     {  // only return records if no error and at least one record
 935         char *odr_database = odr_strdup(odr,
 936                                         b->m_frontend_database.c_str());
 937         Z_NamePlusRecordList *npl = (Z_NamePlusRecordList *)
 938             odr_malloc(odr, sizeof(*npl));
 939         *number_of_records_returned = i;
 940         npl->num_records = i;
 941         npl->records = (Z_NamePlusRecord **)
 942             odr_malloc(odr, i * sizeof(*npl->records));
 943         for (i = 0; i < number_to_present; i++)
 944         {
 945             Z_NamePlusRecord *npr = 0;
 946             const char *addinfo;
 947             int sur_error = ZOOM_record_error(recs[i], 0 /* msg */,
 948                                               &addinfo, 0 /* diagset */);
 949
 950             if (sur_error)
 951             {
 952                 npr = zget_surrogateDiagRec(odr, odr_database, sur_error,
 953                                             addinfo);
 954             }
 955             else if (enable_pz2_retrieval)
 956             {
 957                 char rec_type_str[100];
 958                 const char *record_encoding = 0;
 959
 960                 if (b->sptr->record_encoding.length())
 961                     record_encoding = b->sptr->record_encoding.c_str();
 962                 else if (assume_marc8_charset)
 963                     record_encoding = "marc8";
 964
 965                 strcpy(rec_type_str, b->sptr->use_turbomarc ? "txml" : "xml");
 966                 if (record_encoding)
 967                 {
 968                     strcat(rec_type_str, "; charset=");
 969                     strcat(rec_type_str, record_encoding);
 970                 }
 971
 972                 int rec_len;
 973                 xmlChar *xmlrec_buf = 0;
 974                 const char *rec_buf = ZOOM_record_get(recs[i], rec_type_str,
 975                                                       &rec_len);
 976                 if (rec_buf && b->xsp && enable_pz2_transform)
 977                 {
 978                     xmlDoc *rec_doc = xmlParseMemory(rec_buf, rec_len);
 979                     if (rec_doc)
 980                     {
 981                         xmlDoc *rec_res;
 982                         rec_res = xsltApplyStylesheet(b->xsp, rec_doc, 0);
 983
 984                         if (rec_res)
 985                             xsltSaveResultToString(&xmlrec_buf, &rec_len,
 986                                                    rec_res, b->xsp);
 987                         rec_buf = (const char *) xmlrec_buf;
 988                         xmlFreeDoc(rec_doc);
 989                         xmlFreeDoc(rec_res);
 990                     }
 991                 }
 992
 993                 if (rec_buf)
 994                 {
 995                     xmlDoc *doc = xmlParseMemory(rec_buf, rec_len);
 996                     std::string res =
 997                         mp::xml::url_recipe_handle(doc, b->sptr->urlRecipe);
 998                     if (res.length() && b->content_session_id.length())
 999                     {
1000                         size_t off = res.find_first_of("://");
1001                         if (off != std::string::npos)
1002                         {
1003                             char tmp[1024];
1004                             sprintf(tmp, "%s.%s/",
1005                                     b->content_session_id.c_str(),
1006                                     m_p->content_proxy_server.c_str());
1007                             res.insert(off + 3, tmp);
1008                         }
1009                     }
1010                     if (res.length())
1011                     {
1012                         xmlNode *ptr = xmlDocGetRootElement(doc);
1013                         while (ptr && ptr->type != XML_ELEMENT_NODE)
1014                             ptr = ptr->next;
1015                         xmlNode *c =
1016                             xmlNewChild(ptr, 0, BAD_CAST "generated-url", 0);
1017                         xmlNode * t = xmlNewText(BAD_CAST res.c_str());
1018                         xmlAddChild(c, t);
1019
1020                         if (xmlrec_buf)
1021                             xmlFree(xmlrec_buf);
1022
1023                         xmlDocDumpMemory(doc, &xmlrec_buf, &rec_len);
1024                         rec_buf = (const char *) xmlrec_buf;
1025                     }
1026                     xmlFreeDoc(doc);
1027                 }
1028                 if (rec_buf)
1029                 {
1030                     npr = (Z_NamePlusRecord *) odr_malloc(odr, sizeof(*npr));
1031                     npr->databaseName = odr_database;
1032                     npr->which = Z_NamePlusRecord_databaseRecord;
1033                     npr->u.databaseRecord =
1034                         z_ext_record_xml(odr, rec_buf, rec_len);
1035                 }
1036                 else
1037                 {
1038                     npr = zget_surrogateDiagRec(
1039                         odr, odr_database,
1040                         YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS,
1041                         rec_type_str);
1042                 }
1043                 if (xmlrec_buf)
1044                     xmlFree(xmlrec_buf);
1045             }
1046             else
1047             {
1048                 Z_External *ext =
1049                     (Z_External *) ZOOM_record_get(recs[i], "ext", 0);
1050                 if (ext)
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 = ext;
1056                 }
1057                 else
1058                 {
1059                     npr = zget_surrogateDiagRec(
1060                         odr, odr_database,
1061                         YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS,
1062                         "ZOOM_record, type ext");
1063                 }
1064             }
1065             npl->records[i] = npr;
1066         }
1067         records = (Z_Records*) odr_malloc(odr, sizeof(*records));
1068         records->which = Z_Records_DBOSD;
1069         records->u.databaseOrSurDiagnostics = npl;
1070     }
1071     return records;
1072 }
1073
1074 struct cql_node *yf::Zoom::Impl::convert_cql_fields(struct cql_node *cn,
1075                                                     ODR odr)
1076 {
1077     struct cql_node *r = 0;
1078     if (!cn)
1079         return 0;
1080     switch (cn->which)
1081     {
1082     case CQL_NODE_ST:
1083         if (cn->u.st.index)
1084         {
1085             std::map<std::string,std::string>::const_iterator it;
1086             it = fieldmap.find(cn->u.st.index);
1087             if (it == fieldmap.end())
1088                 return cn;
1089             if (it->second.length())
1090                 cn->u.st.index = odr_strdup(odr, it->second.c_str());
1091             else
1092                 cn->u.st.index = 0;
1093         }
1094         break;
1095     case CQL_NODE_BOOL:
1096         r = convert_cql_fields(cn->u.boolean.left, odr);
1097         if (!r)
1098             r = convert_cql_fields(cn->u.boolean.right, odr);
1099         break;
1100     case CQL_NODE_SORT:
1101         r = convert_cql_fields(cn->u.sort.search, odr);
1102         break;
1103     }
1104     return r;
1105 }
1106
1107 void yf::Zoom::Frontend::handle_search(mp::Package &package)
1108 {
1109     Z_GDU *gdu = package.request().get();
1110     Z_APDU *apdu_req = gdu->u.z3950;
1111     Z_APDU *apdu_res = 0;
1112     mp::odr odr;
1113     Z_SearchRequest *sr = apdu_req->u.searchRequest;
1114     if (sr->num_databaseNames != 1)
1115     {
1116         apdu_res = odr.create_searchResponse(
1117             apdu_req, YAZ_BIB1_TOO_MANY_DATABASES_SPECIFIED, 0);
1118         package.response() = apdu_res;
1119         return;
1120     }
1121
1122     int error = 0;
1123     char *addinfo = 0;
1124     std::string db(sr->databaseNames[0]);
1125     BackendPtr b = get_backend_from_databases(db, &error, &addinfo, odr);
1126     if (error)
1127     {
1128         apdu_res =
1129             odr.create_searchResponse(apdu_req, error, addinfo);
1130         package.response() = apdu_res;
1131         return;
1132     }
1133
1134     b->set_option("setname", "default");
1135
1136     Odr_int hits = 0;
1137     Z_Query *query = sr->query;
1138     WRBUF ccl_wrbuf = 0;
1139     WRBUF pqf_wrbuf = 0;
1140
1141     if (query->which == Z_Query_type_1 || query->which == Z_Query_type_101)
1142     {
1143         // RPN
1144         pqf_wrbuf = wrbuf_alloc();
1145         yaz_rpnquery_to_wrbuf(pqf_wrbuf, query->u.type_1);
1146     }
1147     else if (query->which == Z_Query_type_2)
1148     {
1149         // CCL
1150         ccl_wrbuf = wrbuf_alloc();
1151         wrbuf_write(ccl_wrbuf, (const char *) query->u.type_2->buf,
1152                     query->u.type_2->len);
1153     }
1154     else if (query->which == Z_Query_type_104 &&
1155              query->u.type_104->which == Z_External_CQL)
1156     {
1157         // CQL
1158         const char *cql = query->u.type_104->u.cql;
1159         CQL_parser cp = cql_parser_create();
1160         int r = cql_parser_string(cp, cql);
1161         if (r)
1162         {
1163             cql_parser_destroy(cp);
1164             apdu_res =
1165                 odr.create_searchResponse(apdu_req,
1166                                           YAZ_BIB1_MALFORMED_QUERY,
1167                                           "CQL syntax error");
1168             package.response() = apdu_res;
1169             return;
1170         }
1171         struct cql_node *cn = cql_parser_result(cp);
1172         struct cql_node *cn_error = m_p->convert_cql_fields(cn, odr);
1173         if (cn_error)
1174         {
1175             // hopefully we are getting a ptr to a index+relation+term node
1176             addinfo = 0;
1177             if (cn_error->which == CQL_NODE_ST)
1178                 addinfo = cn_error->u.st.index;
1179
1180             apdu_res =
1181                 odr.create_searchResponse(apdu_req,
1182                                           YAZ_BIB1_UNSUPP_USE_ATTRIBUTE,
1183                                           addinfo);
1184             package.response() = apdu_res;
1185             return;
1186         }
1187         char ccl_buf[1024];
1188
1189         r = cql_to_ccl_buf(cn, ccl_buf, sizeof(ccl_buf));
1190         if (r == 0)
1191         {
1192             ccl_wrbuf = wrbuf_alloc();
1193             wrbuf_puts(ccl_wrbuf, ccl_buf);
1194         }
1195         cql_parser_destroy(cp);
1196         if (r)
1197         {
1198             apdu_res =
1199                 odr.create_searchResponse(apdu_req,
1200                                           YAZ_BIB1_MALFORMED_QUERY,
1201                                           "CQL to CCL conversion error");
1202             package.response() = apdu_res;
1203             return;
1204         }
1205     }
1206     else
1207     {
1208         apdu_res =
1209             odr.create_searchResponse(apdu_req, YAZ_BIB1_QUERY_TYPE_UNSUPP, 0);
1210         package.response() = apdu_res;
1211         return;
1212     }
1213
1214     if (ccl_wrbuf)
1215     {
1216         // CCL to PQF
1217         assert(pqf_wrbuf == 0);
1218         int cerror, cpos;
1219         struct ccl_rpn_node *cn;
1220         yaz_log(YLOG_LOG, "CCL: %s", wrbuf_cstr(ccl_wrbuf));
1221         cn = ccl_find_str(b->sptr->ccl_bibset, wrbuf_cstr(ccl_wrbuf),
1222                           &cerror, &cpos);
1223         wrbuf_destroy(ccl_wrbuf);
1224         if (!cn)
1225         {
1226             char *addinfo = odr_strdup(odr, ccl_err_msg(cerror));
1227             int z3950_diag = YAZ_BIB1_MALFORMED_QUERY;
1228
1229             switch (cerror)
1230             {
1231             case CCL_ERR_UNKNOWN_QUAL:
1232                 z3950_diag = YAZ_BIB1_UNSUPP_USE_ATTRIBUTE;
1233                 break;
1234             case CCL_ERR_TRUNC_NOT_LEFT:
1235             case CCL_ERR_TRUNC_NOT_RIGHT:
1236             case CCL_ERR_TRUNC_NOT_BOTH:
1237                 z3950_diag = YAZ_BIB1_UNSUPP_TRUNCATION_ATTRIBUTE;
1238                 break;
1239             }
1240             apdu_res =
1241                 odr.create_searchResponse(apdu_req, z3950_diag, addinfo);
1242             package.response() = apdu_res;
1243             return;
1244         }
1245         pqf_wrbuf = wrbuf_alloc();
1246         ccl_pquery(pqf_wrbuf, cn);
1247         ccl_rpn_delete(cn);
1248     }
1249
1250     assert(pqf_wrbuf);
1251     if (b->get_option("sru"))
1252     {
1253         int status = 0;
1254         Z_RPNQuery *zquery;
1255         zquery = p_query_rpn(odr, wrbuf_cstr(pqf_wrbuf));
1256         WRBUF wrb = wrbuf_alloc();
1257
1258         if (!strcmp(b->get_option("sru"), "solr"))
1259         {
1260             solr_transform_t cqlt = solr_transform_create();
1261
1262             status = solr_transform_rpn2solr_wrbuf(cqlt, wrb, zquery);
1263
1264             solr_transform_close(cqlt);
1265         }
1266         else
1267         {
1268             cql_transform_t cqlt = cql_transform_create();
1269
1270             status = cql_transform_rpn2cql_wrbuf(cqlt, wrb, zquery);
1271
1272             cql_transform_close(cqlt);
1273         }
1274         if (status == 0)
1275         {
1276             yaz_log(YLOG_LOG, "search CQL: %s", wrbuf_cstr(wrb));
1277             b->search_cql(wrbuf_cstr(wrb), &hits, &error, &addinfo, odr);
1278         }
1279
1280         wrbuf_destroy(wrb);
1281         wrbuf_destroy(pqf_wrbuf);
1282         if (status)
1283         {
1284             apdu_res =
1285                 odr.create_searchResponse(apdu_req, YAZ_BIB1_MALFORMED_QUERY,
1286                                           "can not convert from RPN to CQL/SOLR");
1287             package.response() = apdu_res;
1288             return;
1289         }
1290     }
1291     else
1292     {
1293         yaz_log(YLOG_LOG, "search PQF: %s", wrbuf_cstr(pqf_wrbuf));
1294         b->search_pqf(wrbuf_cstr(pqf_wrbuf), &hits, &error, &addinfo, odr);
1295         wrbuf_destroy(pqf_wrbuf);
1296     }
1297
1298
1299     const char *element_set_name = 0;
1300     Odr_int number_to_present = 0;
1301     if (!error)
1302         mp::util::piggyback_sr(sr, hits, number_to_present, &element_set_name);
1303
1304     Odr_int number_of_records_returned = 0;
1305     Z_Records *records = get_records(
1306         0, number_to_present, &error, &addinfo,
1307         &number_of_records_returned, odr, b, sr->preferredRecordSyntax,
1308         element_set_name);
1309     apdu_res = odr.create_searchResponse(apdu_req, error, addinfo);
1310     if (records)
1311     {
1312         apdu_res->u.searchResponse->records = records;
1313         apdu_res->u.searchResponse->numberOfRecordsReturned =
1314             odr_intdup(odr, number_of_records_returned);
1315     }
1316     apdu_res->u.searchResponse->resultCount = odr_intdup(odr, hits);
1317     package.response() = apdu_res;
1318 }
1319
1320 void yf::Zoom::Frontend::handle_present(mp::Package &package)
1321 {
1322     Z_GDU *gdu = package.request().get();
1323     Z_APDU *apdu_req = gdu->u.z3950;
1324     Z_APDU *apdu_res = 0;
1325     Z_PresentRequest *pr = apdu_req->u.presentRequest;
1326
1327     mp::odr odr;
1328     if (!m_backend)
1329     {
1330         package.response() = odr.create_presentResponse(
1331             apdu_req, YAZ_BIB1_SPECIFIED_RESULT_SET_DOES_NOT_EXIST, 0);
1332         return;
1333     }
1334     const char *element_set_name = 0;
1335     Z_RecordComposition *comp = pr->recordComposition;
1336     if (comp && comp->which != Z_RecordComp_simple)
1337     {
1338         package.response() = odr.create_presentResponse(
1339             apdu_req,
1340             YAZ_BIB1_PRESENT_COMP_SPEC_PARAMETER_UNSUPP, 0);
1341         return;
1342     }
1343     if (comp && comp->u.simple->which == Z_ElementSetNames_generic)
1344         element_set_name = comp->u.simple->u.generic;
1345     Odr_int number_of_records_returned = 0;
1346     int error = 0;
1347     char *addinfo = 0;
1348     Z_Records *records = get_records(
1349         *pr->resultSetStartPoint - 1, *pr->numberOfRecordsRequested,
1350         &error, &addinfo, &number_of_records_returned, odr, m_backend,
1351         pr->preferredRecordSyntax, element_set_name);
1352
1353     apdu_res = odr.create_presentResponse(apdu_req, error, addinfo);
1354     if (records)
1355     {
1356         apdu_res->u.presentResponse->records = records;
1357         apdu_res->u.presentResponse->numberOfRecordsReturned =
1358             odr_intdup(odr, number_of_records_returned);
1359     }
1360     package.response() = apdu_res;
1361 }
1362
1363 void yf::Zoom::Frontend::handle_package(mp::Package &package)
1364 {
1365     Z_GDU *gdu = package.request().get();
1366     if (!gdu)
1367         ;
1368     else if (gdu->which == Z_GDU_Z3950)
1369     {
1370         Z_APDU *apdu_req = gdu->u.z3950;
1371         if (apdu_req->which == Z_APDU_initRequest)
1372         {
1373             mp::odr odr;
1374             package.response() = odr.create_close(
1375                 apdu_req,
1376                 Z_Close_protocolError,
1377                 "double init");
1378         }
1379         else if (apdu_req->which == Z_APDU_searchRequest)
1380         {
1381             handle_search(package);
1382         }
1383         else if (apdu_req->which == Z_APDU_presentRequest)
1384         {
1385             handle_present(package);
1386         }
1387         else
1388         {
1389             mp::odr odr;
1390             package.response() = odr.create_close(
1391                 apdu_req,
1392                 Z_Close_protocolError,
1393                 "zoom filter cannot handle this APDU");
1394             package.session().close();
1395         }
1396     }
1397     else
1398     {
1399         package.session().close();
1400     }
1401 }
1402
1403 void yf::Zoom::Impl::process(mp::Package &package)
1404 {
1405     FrontendPtr f = get_frontend(package);
1406     Z_GDU *gdu = package.request().get();
1407
1408     if (f->m_is_virtual)
1409     {
1410         f->handle_package(package);
1411     }
1412     else if (gdu && gdu->which == Z_GDU_Z3950 && gdu->u.z3950->which ==
1413              Z_APDU_initRequest)
1414     {
1415         Z_InitRequest *req = gdu->u.z3950->u.initRequest;
1416         f->m_init_gdu = gdu;
1417
1418         mp::odr odr;
1419         Z_APDU *apdu = odr.create_initResponse(gdu->u.z3950, 0, 0);
1420         Z_InitResponse *resp = apdu->u.initResponse;
1421
1422         int i;
1423         static const int masks[] = {
1424             Z_Options_search,
1425             Z_Options_present,
1426             -1
1427         };
1428         for (i = 0; masks[i] != -1; i++)
1429             if (ODR_MASK_GET(req->options, masks[i]))
1430                 ODR_MASK_SET(resp->options, masks[i]);
1431
1432         static const int versions[] = {
1433             Z_ProtocolVersion_1,
1434             Z_ProtocolVersion_2,
1435             Z_ProtocolVersion_3,
1436             -1
1437         };
1438         for (i = 0; versions[i] != -1; i++)
1439             if (ODR_MASK_GET(req->protocolVersion, versions[i]))
1440                 ODR_MASK_SET(resp->protocolVersion, versions[i]);
1441             else
1442                 break;
1443
1444         *resp->preferredMessageSize = *req->preferredMessageSize;
1445         *resp->maximumRecordSize = *req->maximumRecordSize;
1446
1447         package.response() = apdu;
1448         f->m_is_virtual = true;
1449     }
1450     else
1451         package.move();
1452
1453     release_frontend(package);
1454 }
1455
1456
1457 static mp::filter::Base* filter_creator()
1458 {
1459     return new mp::filter::Zoom;
1460 }
1461
1462 extern "C" {
1463     struct metaproxy_1_filter_struct metaproxy_1_filter_zoom = {
1464         0,
1465         "zoom",
1466         filter_creator
1467     };
1468 }
1469
1470
1471 /*
1472  * Local variables:
1473  * c-basic-offset: 4
1474  * c-file-style: "Stroustrup"
1475  * indent-tabs-mode: nil
1476  * End:
1477  * vim: shiftwidth=4 tabstop=8 expandtab
1478  */
1479