src/filter_zoom.cpp

   1 /* This file is part of Metaproxy.
   2    Copyright (C) 2005-2012 Index Data
   3
   4 Metaproxy is free software; you can redistribute it and/or modify it under
   5 the terms of the GNU General Public License as published by the Free
   6 Software Foundation; either version 2, or (at your option) any later
   7 version.
   8
   9 Metaproxy is distributed in the hope that it will be useful, but WITHOUT ANY
  10 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17 */
  18
  19 #include "config.hpp"
  20
  21 #include <stdlib.h>
  22 #include <sys/types.h>
  23 #include "filter_zoom.hpp"
  24 #include <metaproxy/package.hpp>
  25 #include <metaproxy/util.hpp>
  26 #include <metaproxy/xmlutil.hpp>
  27 #include "torus.hpp"
  28
  29 #include <libxslt/xsltutils.h>
  30 #include <libxslt/transform.h>
  31
  32 #include <boost/thread/mutex.hpp>
  33 #include <boost/thread/condition.hpp>
  34
  35 #include <yaz/yaz-version.h>
  36 #include <yaz/tpath.h>
  37 #include <yaz/srw.h>
  38 #include <yaz/ccl_xml.h>
  39 #include <yaz/ccl.h>
  40 #include <yaz/rpn2cql.h>
  41 #include <yaz/rpn2solr.h>
  42 #include <yaz/pquery.h>
  43 #include <yaz/cql.h>
  44 #include <yaz/oid_db.h>
  45 #include <yaz/diagbib1.h>
  46 #include <yaz/log.h>
  47 #include <yaz/zgdu.h>
  48 #include <yaz/querytowrbuf.h>
  49 #include <yaz/sortspec.h>
  50 #include <yaz/tokenizer.h>
  51 #include <yaz/zoom.h>
  52
  53 namespace mp = metaproxy_1;
  54 namespace yf = mp::filter;
  55
  56 namespace metaproxy_1 {
  57     namespace filter {
  58         class Zoom::Searchable : boost::noncopyable {
  59           public:
  60             std::string authentication;
  61             std::string cfAuth;
  62             std::string cfProxy;
  63             std::string cfSubDB;
  64             std::string udb;
  65             std::string target;
  66             std::string query_encoding;
  67             std::string sru;
  68             std::string sru_version;
  69             std::string request_syntax;
  70             std::string element_set;
  71             std::string record_encoding;
  72             std::string transform_xsl_fname;
  73             std::string transform_xsl_content;
  74             std::string urlRecipe;
  75             std::string contentConnector;
  76             std::string sortStrategy;
  77             bool use_turbomarc;
  78             bool piggyback;
  79             CCL_bibset ccl_bibset;
  80             std::map<std::string, std::string> sortmap;
  81             Searchable(CCL_bibset base);
  82             ~Searchable();
  83         };
  84         class Zoom::Backend : boost::noncopyable {
  85             friend class Impl;
  86             friend class Frontend;
  87             std::string zurl;
  88             WRBUF m_apdu_wrbuf;
  89             ZOOM_connection m_connection;
  90             ZOOM_resultset m_resultset;
  91             std::string m_frontend_database;
  92             SearchablePtr sptr;
  93             xsltStylesheetPtr xsp;
  94             std::string content_session_id;
  95             bool enable_cproxy;
  96             bool enable_explain;
  97             xmlDoc *explain_doc;
  98         public:
  99             Backend();
 100             ~Backend();
 101             void connect(std::string zurl, int *error, char **addinfo,
 102                          ODR odr);
 103             void search(ZOOM_query q, Odr_int *hits,
 104                         int *error, char **addinfo, ODR odr);
 105             void present(Odr_int start, Odr_int number, ZOOM_record *recs,
 106                          int *error, char **addinfo, ODR odr);
 107             void set_option(const char *name, const char *value);
 108             void set_option(const char *name, std::string value);
 109             const char *get_option(const char *name);
 110             void get_zoom_error(int *error, char **addinfo, ODR odr);
 111         };
 112         class Zoom::Frontend : boost::noncopyable {
 113             friend class Impl;
 114             Impl *m_p;
 115             bool m_is_virtual;
 116             bool m_in_use;
 117             yazpp_1::GDU m_init_gdu;
 118             BackendPtr m_backend;
 119             void handle_package(mp::Package &package);
 120             void handle_search(mp::Package &package);
 121
 122             BackendPtr explain_search(mp::Package &package,
 123                                       std::string &database,
 124                                       int *error,
 125                                       char **addinfo,
 126                                       mp::odr &odr,
 127                                       std::string &torus_db,
 128                                       std::string &realm);
 129             void handle_present(mp::Package &package);
 130             BackendPtr get_backend_from_databases(mp::Package &package,
 131                                                   std::string &database,
 132                                                   int *error,
 133                                                   char **addinfo,
 134                                                   mp::odr &odr,
 135                                                   int *proxy_step);
 136
 137             bool create_content_session(mp::Package &package,
 138                                         BackendPtr b,
 139                                         int *error,
 140                                         char **addinfo,
 141                                         ODR odr,
 142                                         std::string authentication,
 143                                         std::string proxy,
 144                                         std::string realm);
 145
 146             void prepare_elements(BackendPtr b,
 147                                   Odr_oid *preferredRecordSyntax,
 148                                   const char *element_set_name,
 149                                   bool &enable_pz2_retrieval,
 150                                   bool &enable_pz2_transform,
 151                                   bool &enable_record_transform,
 152                                   bool &assume_marc8_charset);
 153
 154             Z_Records *get_records(Package &package,
 155                                    Odr_int start,
 156                                    Odr_int number_to_present,
 157                                    int *error,
 158                                    char **addinfo,
 159                                    Odr_int *number_of_records_returned,
 160                                    ODR odr, BackendPtr b,
 161                                    Odr_oid *preferredRecordSyntax,
 162                                    const char *element_set_name);
 163             Z_Records *get_explain_records(Package &package,
 164                                            Odr_int start,
 165                                            Odr_int number_to_present,
 166                                            int *error,
 167                                            char **addinfo,
 168                                            Odr_int *number_of_records_returned,
 169                                            ODR odr, BackendPtr b,
 170                                            Odr_oid *preferredRecordSyntax,
 171                                            const char *element_set_name);
 172
 173             void log_diagnostic(mp::Package &package,
 174                                 int error, const char *addinfo);
 175         public:
 176             Frontend(Impl *impl);
 177             ~Frontend();
 178         };
 179         class Zoom::Impl {
 180             friend class Frontend;
 181         public:
 182             Impl();
 183             ~Impl();
 184             void process(metaproxy_1::Package & package);
 185             void configure(const xmlNode * ptr, bool test_only,
 186                            const char *path);
 187         private:
 188             void configure_local_records(const xmlNode * ptr, bool test_only);
 189             FrontendPtr get_frontend(mp::Package &package);
 190             void release_frontend(mp::Package &package);
 191             SearchablePtr parse_torus_record(const xmlNode *ptr);
 192             struct cql_node *convert_cql_fields(struct cql_node *cn, ODR odr);
 193             std::map<mp::Session, FrontendPtr> m_clients;
 194             boost::mutex m_mutex;
 195             boost::condition m_cond_session_ready;
 196             std::string torus_searchable_url;
 197             std::string torus_content_url;
 198             std::string default_realm;
 199             std::map<std::string,std::string> fieldmap;
 200             std::string xsldir;
 201             std::string file_path;
 202             std::string content_proxy_server;
 203             std::string content_tmp_file;
 204             bool apdu_log;
 205             CCL_bibset bibset;
 206             std::string element_transform;
 207             std::string element_raw;
 208             std::string proxy;
 209             xsltStylesheetPtr explain_xsp;
 210             xsltStylesheetPtr record_xsp;
 211             std::map<std::string,SearchablePtr> s_map;
 212             std::string zoom_timeout;
 213         };
 214     }
 215 }
 216
 217
 218 static xmlNode *xml_node_search(xmlNode *ptr, int *num, int m)
 219 {
 220     while (ptr)
 221     {
 222         if (ptr->type == XML_ELEMENT_NODE &&
 223             !strcmp((const char *) ptr->name, "recordData"))
 224         {
 225             (*num)++;
 226             if (m == *num)
 227                 return ptr;
 228         }
 229         else  // else: we don't want to find nested nodes
 230         {
 231             xmlNode *ret_node = xml_node_search(ptr->children, num, m);
 232             if (ret_node)
 233                 return ret_node;
 234         }
 235         ptr = ptr->next;
 236     }
 237     return 0;
 238 }
 239
 240 // define Pimpl wrapper forwarding to Impl
 241
 242 yf::Zoom::Zoom() : m_p(new Impl)
 243 {
 244 }
 245
 246 yf::Zoom::~Zoom()
 247 {  // must have a destructor because of boost::scoped_ptr
 248 }
 249
 250 void yf::Zoom::configure(const xmlNode *xmlnode, bool test_only,
 251                          const char *path)
 252 {
 253     m_p->configure(xmlnode, test_only, path);
 254 }
 255
 256 void yf::Zoom::process(mp::Package &package) const
 257 {
 258     m_p->process(package);
 259 }
 260
 261
 262 // define Implementation stuff
 263
 264 yf::Zoom::Backend::Backend()
 265 {
 266     m_apdu_wrbuf = wrbuf_alloc();
 267     m_connection = ZOOM_connection_create(0);
 268     ZOOM_connection_save_apdu_wrbuf(m_connection, m_apdu_wrbuf);
 269     m_resultset = 0;
 270     xsp = 0;
 271     enable_cproxy = true;
 272     enable_explain = false;
 273     explain_doc = 0;
 274 }
 275
 276 yf::Zoom::Backend::~Backend()
 277 {
 278     if (xsp)
 279         xsltFreeStylesheet(xsp);
 280     if (explain_doc)
 281         xmlFreeDoc(explain_doc);
 282     ZOOM_connection_destroy(m_connection);
 283     ZOOM_resultset_destroy(m_resultset);
 284     wrbuf_destroy(m_apdu_wrbuf);
 285 }
 286
 287
 288 void yf::Zoom::Backend::get_zoom_error(int *error, char **addinfo,
 289                                        ODR odr)
 290 {
 291     const char *msg = 0;
 292     const char *zoom_addinfo = 0;
 293     const char *dset = 0;
 294     int error0 = ZOOM_connection_error_x(m_connection, &msg,
 295                                          &zoom_addinfo, &dset);
 296     if (error0)
 297     {
 298         if (!dset)
 299             dset = "Unknown";
 300
 301         if (!strcmp(dset, "info:srw/diagnostic/1"))
 302             *error = yaz_diag_srw_to_bib1(error0);
 303         else if (!strcmp(dset, "Bib-1"))
 304             *error = error0;
 305         else
 306             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 307
 308         *addinfo = (char *) odr_malloc(
 309             odr, 30 + strlen(dset) + strlen(msg) +
 310             (zoom_addinfo ? strlen(zoom_addinfo) : 0));
 311         **addinfo = '\0';
 312         if (zoom_addinfo && *zoom_addinfo)
 313         {
 314             strcpy(*addinfo, zoom_addinfo);
 315             strcat(*addinfo, " ");
 316         }
 317         sprintf(*addinfo + strlen(*addinfo), "(%s %d %s)", dset, error0, msg);
 318     }
 319 }
 320
 321 void yf::Zoom::Backend::connect(std::string zurl,
 322                                 int *error, char **addinfo,
 323                                 ODR odr)
 324 {
 325     ZOOM_connection_connect(m_connection, zurl.c_str(), 0);
 326     get_zoom_error(error, addinfo, odr);
 327 }
 328
 329 void yf::Zoom::Backend::search(ZOOM_query q, Odr_int *hits,
 330                                int *error, char **addinfo, ODR odr)
 331 {
 332     ZOOM_resultset_destroy(m_resultset);
 333     m_resultset = ZOOM_connection_search(m_connection, q);
 334     get_zoom_error(error, addinfo, odr);
 335     if (*error == 0)
 336         *hits = ZOOM_resultset_size(m_resultset);
 337     else
 338         *hits = 0;
 339 }
 340
 341 void yf::Zoom::Backend::present(Odr_int start, Odr_int number,
 342                                 ZOOM_record *recs,
 343                                 int *error, char **addinfo, ODR odr)
 344 {
 345     ZOOM_resultset_records(m_resultset, recs, start, number);
 346     get_zoom_error(error, addinfo, odr);
 347 }
 348
 349 void yf::Zoom::Backend::set_option(const char *name, const char *value)
 350 {
 351     ZOOM_connection_option_set(m_connection, name, value);
 352     if (m_resultset)
 353         ZOOM_resultset_option_set(m_resultset, name, value);
 354 }
 355
 356 void yf::Zoom::Backend::set_option(const char *name, std::string value)
 357 {
 358     set_option(name, value.c_str());
 359 }
 360
 361 const char *yf::Zoom::Backend::get_option(const char *name)
 362 {
 363     return ZOOM_connection_option_get(m_connection, name);
 364 }
 365
 366 yf::Zoom::Searchable::Searchable(CCL_bibset base)
 367 {
 368     piggyback = true;
 369     use_turbomarc = true;
 370     sortStrategy = "embed";
 371     urlRecipe = "${md-electronic-url}";
 372     ccl_bibset = ccl_qual_dup(base);
 373 }
 374
 375 yf::Zoom::Searchable::~Searchable()
 376 {
 377     ccl_qual_rm(&ccl_bibset);
 378 }
 379
 380 yf::Zoom::Frontend::Frontend(Impl *impl) :
 381     m_p(impl), m_is_virtual(false), m_in_use(true)
 382 {
 383 }
 384
 385 yf::Zoom::Frontend::~Frontend()
 386 {
 387 }
 388
 389 yf::Zoom::FrontendPtr yf::Zoom::Impl::get_frontend(mp::Package &package)
 390 {
 391     boost::mutex::scoped_lock lock(m_mutex);
 392
 393     std::map<mp::Session,yf::Zoom::FrontendPtr>::iterator it;
 394
 395     while(true)
 396     {
 397         it = m_clients.find(package.session());
 398         if (it == m_clients.end())
 399             break;
 400
 401         if (!it->second->m_in_use)
 402         {
 403             it->second->m_in_use = true;
 404             return it->second;
 405         }
 406         m_cond_session_ready.wait(lock);
 407     }
 408     FrontendPtr f(new Frontend(this));
 409     m_clients[package.session()] = f;
 410     f->m_in_use = true;
 411     return f;
 412 }
 413
 414 void yf::Zoom::Impl::release_frontend(mp::Package &package)
 415 {
 416     boost::mutex::scoped_lock lock(m_mutex);
 417     std::map<mp::Session,yf::Zoom::FrontendPtr>::iterator it;
 418
 419     it = m_clients.find(package.session());
 420     if (it != m_clients.end())
 421     {
 422         if (package.session().is_closed())
 423         {
 424             m_clients.erase(it);
 425         }
 426         else
 427         {
 428             it->second->m_in_use = false;
 429         }
 430         m_cond_session_ready.notify_all();
 431     }
 432 }
 433
 434 yf::Zoom::Impl::Impl() :
 435     apdu_log(false), element_transform("pz2") , element_raw("raw"),
 436     zoom_timeout("40")
 437 {
 438     bibset = ccl_qual_mk();
 439
 440     explain_xsp = 0;
 441     record_xsp = 0;
 442     srand((unsigned int) time(0));
 443 }
 444
 445 yf::Zoom::Impl::~Impl()
 446 {
 447     if (explain_xsp)
 448         xsltFreeStylesheet(explain_xsp);
 449     ccl_qual_rm(&bibset);
 450 }
 451
 452 yf::Zoom::SearchablePtr yf::Zoom::Impl::parse_torus_record(const xmlNode *ptr)
 453 {
 454     Zoom::SearchablePtr s(new Searchable(bibset));
 455
 456     for (ptr = ptr->children; ptr; ptr = ptr->next)
 457     {
 458         if (ptr->type != XML_ELEMENT_NODE)
 459             continue;
 460         if (!strcmp((const char *) ptr->name, "layer"))
 461             ptr = ptr->children;
 462         else if (!strcmp((const char *) ptr->name,
 463                          "authentication"))
 464         {
 465             s->authentication = mp::xml::get_text(ptr);
 466         }
 467         else if (!strcmp((const char *) ptr->name,
 468                          "cfAuth"))
 469         {
 470             s->cfAuth = mp::xml::get_text(ptr);
 471         }
 472         else if (!strcmp((const char *) ptr->name,
 473                          "cfProxy"))
 474         {
 475             s->cfProxy = mp::xml::get_text(ptr);
 476         }
 477         else if (!strcmp((const char *) ptr->name,
 478                          "cfSubDB"))
 479         {
 480             s->cfSubDB = mp::xml::get_text(ptr);
 481         }
 482         else if (!strcmp((const char *) ptr->name,
 483                          "contentConnector"))
 484         {
 485             s->contentConnector = mp::xml::get_text(ptr);
 486         }
 487         else if (!strcmp((const char *) ptr->name, "udb"))
 488         {
 489             s->udb = mp::xml::get_text(ptr);
 490         }
 491         else if (!strcmp((const char *) ptr->name, "zurl"))
 492         {
 493             s->target = mp::xml::get_text(ptr);
 494         }
 495         else if (!strcmp((const char *) ptr->name, "sru"))
 496         {
 497             s->sru = mp::xml::get_text(ptr);
 498         }
 499         else if (!strcmp((const char *) ptr->name, "SRUVersion") ||
 500                  !strcmp((const char *) ptr->name, "sruVersion"))
 501         {
 502             s->sru_version = mp::xml::get_text(ptr);
 503         }
 504         else if (!strcmp((const char *) ptr->name,
 505                          "queryEncoding"))
 506         {
 507             s->query_encoding = mp::xml::get_text(ptr);
 508         }
 509         else if (!strcmp((const char *) ptr->name,
 510                          "piggyback"))
 511         {
 512             s->piggyback = mp::xml::get_bool(ptr, true);
 513         }
 514         else if (!strcmp((const char *) ptr->name,
 515                          "requestSyntax"))
 516         {
 517             s->request_syntax = mp::xml::get_text(ptr);
 518         }
 519         else if (!strcmp((const char *) ptr->name,
 520                          "elementSet"))
 521         {
 522             s->element_set = mp::xml::get_text(ptr);
 523         }
 524         else if (!strcmp((const char *) ptr->name,
 525                          "recordEncoding"))
 526         {
 527             s->record_encoding = mp::xml::get_text(ptr);
 528         }
 529         else if (!strcmp((const char *) ptr->name,
 530                          "transform"))
 531         {
 532             s->transform_xsl_fname = mp::xml::get_text(ptr);
 533         }
 534         else if (!strcmp((const char *) ptr->name,
 535                          "literalTransform"))
 536         {
 537             s->transform_xsl_content = mp::xml::get_text(ptr);
 538         }
 539         else if (!strcmp((const char *) ptr->name,
 540                          "urlRecipe"))
 541         {
 542             s->urlRecipe = mp::xml::get_text(ptr);
 543         }
 544         else if (!strcmp((const char *) ptr->name,
 545                          "useTurboMarc"))
 546         {
 547             ; // useTurboMarc is ignored
 548         }
 549         else if (!strncmp((const char *) ptr->name,
 550                           "cclmap_", 7))
 551         {
 552             std::string value = mp::xml::get_text(ptr);
 553             if (value.length() > 0)
 554             {
 555                 ccl_qual_fitem(s->ccl_bibset, value.c_str(),
 556                                (const char *) ptr->name + 7);
 557             }
 558         }
 559         else if (!strncmp((const char *) ptr->name,
 560                           "sortmap_", 8))
 561         {
 562             std::string value = mp::xml::get_text(ptr);
 563             s->sortmap[(const char *) ptr->name + 8] = value;
 564         }
 565         else if (!strcmp((const char *) ptr->name,
 566                           "sortStrategy"))
 567         {
 568             s->sortStrategy = mp::xml::get_text(ptr);
 569         }
 570     }
 571     return s;
 572 }
 573
 574 void yf::Zoom::Impl::configure_local_records(const xmlNode *ptr, bool test_only)
 575 {
 576     while (ptr && ptr->type != XML_ELEMENT_NODE)
 577         ptr = ptr->next;
 578
 579     if (ptr)
 580     {
 581         if (!strcmp((const char *) ptr->name, "records"))
 582         {
 583             for (ptr = ptr->children; ptr; ptr = ptr->next)
 584             {
 585                 if (ptr->type != XML_ELEMENT_NODE)
 586                     continue;
 587                 if (!strcmp((const char *) ptr->name, "record"))
 588                 {
 589                     SearchablePtr s = parse_torus_record(ptr);
 590                     if (s)
 591                     {
 592                         std::string udb = s->udb;
 593                         if (udb.length())
 594                             s_map[s->udb] = s;
 595                         else
 596                         {
 597                             throw mp::filter::FilterException
 598                                 ("No udb for local torus record");
 599                         }
 600                     }
 601                 }
 602                 else
 603                 {
 604                     throw mp::filter::FilterException
 605                         ("Bad element "
 606                          + std::string((const char *) ptr->name)
 607                          + " in zoom filter inside element "
 608                          "<torus><records>");
 609                 }
 610             }
 611         }
 612         else
 613         {
 614             throw mp::filter::FilterException
 615                 ("Bad element "
 616                  + std::string((const char *) ptr->name)
 617                  + " in zoom filter inside element <torus>");
 618         }
 619     }
 620 }
 621
 622 void yf::Zoom::Impl::configure(const xmlNode *ptr, bool test_only,
 623                                const char *path)
 624 {
 625     std::string explain_xslt_fname;
 626     std::string record_xslt_fname;
 627
 628     content_tmp_file = "/tmp/cf.XXXXXX.p";
 629     if (path && *path)
 630     {
 631         file_path = path;
 632     }
 633     for (ptr = ptr->children; ptr; ptr = ptr->next)
 634     {
 635         if (ptr->type != XML_ELEMENT_NODE)
 636             continue;
 637         else if (!strcmp((const char *) ptr->name, "torus"))
 638         {
 639             const struct _xmlAttr *attr;
 640             for (attr = ptr->properties; attr; attr = attr->next)
 641             {
 642                 if (!strcmp((const char *) attr->name, "url"))
 643                     torus_searchable_url = mp::xml::get_text(attr->children);
 644                 else if (!strcmp((const char *) attr->name, "content_url"))
 645                     torus_content_url = mp::xml::get_text(attr->children);
 646                 else if (!strcmp((const char *) attr->name, "realm"))
 647                     default_realm = mp::xml::get_text(attr->children);
 648                 else if (!strcmp((const char *) attr->name, "xsldir"))
 649                     xsldir = mp::xml::get_text(attr->children);
 650                 else if (!strcmp((const char *) attr->name, "element_transform"))
 651                     element_transform = mp::xml::get_text(attr->children);
 652                 else if (!strcmp((const char *) attr->name, "element_raw"))
 653                     element_raw = mp::xml::get_text(attr->children);
 654                 else if (!strcmp((const char *) attr->name, "proxy"))
 655                     proxy = mp::xml::get_text(attr->children);
 656                 else if (!strcmp((const char *) attr->name, "explain_xsl"))
 657                     explain_xslt_fname = mp::xml::get_text(attr->children);
 658                 else if (!strcmp((const char *) attr->name, "record_xsl"))
 659                     record_xslt_fname = mp::xml::get_text(attr->children);
 660                 else
 661                     throw mp::filter::FilterException(
 662                         "Bad attribute " + std::string((const char *)
 663                                                        attr->name));
 664             }
 665             // If content_url is not given, use value of searchable, to
 666             // ensure backwards compatibility
 667             if (!torus_content_url.length())
 668                 torus_content_url = torus_searchable_url;
 669             configure_local_records(ptr->children, test_only);
 670         }
 671         else if (!strcmp((const char *) ptr->name, "cclmap"))
 672         {
 673             const char *addinfo = 0;
 674             ccl_xml_config(bibset, ptr, &addinfo);
 675         }
 676         else if (!strcmp((const char *) ptr->name, "fieldmap"))
 677         {
 678             const struct _xmlAttr *attr;
 679             std::string ccl_field;
 680             std::string cql_field;
 681             for (attr = ptr->properties; attr; attr = attr->next)
 682             {
 683                 if (!strcmp((const char *) attr->name, "ccl"))
 684                     ccl_field = mp::xml::get_text(attr->children);
 685                 else if (!strcmp((const char *) attr->name, "cql"))
 686                     cql_field = mp::xml::get_text(attr->children);
 687                 else
 688                     throw mp::filter::FilterException(
 689                         "Bad attribute " + std::string((const char *)
 690                                                        attr->name));
 691             }
 692             if (cql_field.length())
 693                 fieldmap[cql_field] = ccl_field;
 694         }
 695         else if (!strcmp((const char *) ptr->name, "contentProxy"))
 696         {
 697             const struct _xmlAttr *attr;
 698             for (attr = ptr->properties; attr; attr = attr->next)
 699             {
 700                 if (!strcmp((const char *) attr->name, "server"))
 701                     content_proxy_server = mp::xml::get_text(attr->children);
 702                 else if (!strcmp((const char *) attr->name, "tmp_file"))
 703                     content_tmp_file = mp::xml::get_text(attr->children);
 704                 else
 705                     throw mp::filter::FilterException(
 706                         "Bad attribute " + std::string((const char *)
 707                                                        attr->name));
 708             }
 709         }
 710         else if (!strcmp((const char *) ptr->name, "log"))
 711         {
 712             const struct _xmlAttr *attr;
 713             for (attr = ptr->properties; attr; attr = attr->next)
 714             {
 715                 if (!strcmp((const char *) attr->name, "apdu"))
 716                     apdu_log = mp::xml::get_bool(attr->children, false);
 717                 else
 718                     throw mp::filter::FilterException(
 719                         "Bad attribute " + std::string((const char *)
 720                                                        attr->name));
 721             }
 722         }
 723         else if (!strcmp((const char *) ptr->name, "zoom"))
 724         {
 725             const struct _xmlAttr *attr;
 726             for (attr = ptr->properties; attr; attr = attr->next)
 727             {
 728                 if (!strcmp((const char *) attr->name, "timeout"))
 729                     zoom_timeout = mp::xml::get_text(attr->children);
 730                 else
 731                     throw mp::filter::FilterException(
 732                         "Bad attribute " + std::string((const char *)
 733                                                        attr->name));
 734             }
 735         }
 736         else
 737         {
 738             throw mp::filter::FilterException
 739                 ("Bad element "
 740                  + std::string((const char *) ptr->name)
 741                  + " in zoom filter");
 742         }
 743     }
 744
 745     if (explain_xslt_fname.length())
 746     {
 747         const char *path = 0;
 748
 749         if (xsldir.length())
 750             path = xsldir.c_str();
 751         else
 752             path = file_path.c_str();
 753
 754         char fullpath[1024];
 755         char *cp = yaz_filepath_resolve(explain_xslt_fname.c_str(),
 756                                         path, 0, fullpath);
 757         if (!cp)
 758         {
 759             throw mp::filter::FilterException
 760                 ("Cannot read XSLT " + explain_xslt_fname);
 761         }
 762
 763         xmlDoc *xsp_doc = xmlParseFile(cp);
 764         if (!xsp_doc)
 765         {
 766             throw mp::filter::FilterException
 767                 ("Cannot parse XSLT " + explain_xslt_fname);
 768         }
 769
 770         explain_xsp = xsltParseStylesheetDoc(xsp_doc);
 771         if (!explain_xsp)
 772         {
 773             xmlFreeDoc(xsp_doc);
 774             throw mp::filter::FilterException
 775                 ("Cannot parse XSLT " + explain_xslt_fname);
 776
 777         }
 778     }
 779
 780     if (record_xslt_fname.length())
 781     {
 782         const char *path = 0;
 783
 784         if (xsldir.length())
 785             path = xsldir.c_str();
 786         else
 787             path = file_path.c_str();
 788
 789         char fullpath[1024];
 790         char *cp = yaz_filepath_resolve(record_xslt_fname.c_str(),
 791                                         path, 0, fullpath);
 792         if (!cp)
 793         {
 794             throw mp::filter::FilterException
 795                 ("Cannot read XSLT " + record_xslt_fname);
 796         }
 797
 798         xmlDoc *xsp_doc = xmlParseFile(cp);
 799         if (!xsp_doc)
 800         {
 801             throw mp::filter::FilterException
 802                 ("Cannot parse XSLT " + record_xslt_fname);
 803         }
 804
 805         record_xsp = xsltParseStylesheetDoc(xsp_doc);
 806         if (!record_xsp)
 807         {
 808             xmlFreeDoc(xsp_doc);
 809             throw mp::filter::FilterException
 810                 ("Cannot parse XSLT " + record_xslt_fname);
 811
 812         }
 813     }
 814 }
 815
 816 bool yf::Zoom::Frontend::create_content_session(mp::Package &package,
 817                                                 BackendPtr b,
 818                                                 int *error, char **addinfo,
 819                                                 ODR odr,
 820                                                 std::string authentication,
 821                                                 std::string proxy,
 822                                                 std::string realm)
 823 {
 824     if (b->sptr->contentConnector.length())
 825     {
 826         char *fname = (char *) xmalloc(m_p->content_tmp_file.length() + 8);
 827         strcpy(fname, m_p->content_tmp_file.c_str());
 828         char *xx = strstr(fname, "XXXXXX");
 829         if (!xx)
 830         {
 831             xx = fname + strlen(fname);
 832             strcat(fname, "XXXXXX");
 833         }
 834         char tmp_char = xx[6];
 835         sprintf(xx, "%06d", ((unsigned) rand()) % 1000000);
 836         xx[6] = tmp_char;
 837
 838         FILE *file = fopen(fname, "w");
 839         if (!file)
 840         {
 841             package.log("zoom", YLOG_WARN|YLOG_ERRNO, "create %s", fname);
 842             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 843             *addinfo = (char *)  odr_malloc(odr, 40 + strlen(fname));
 844             sprintf(*addinfo, "Could not create %s", fname);
 845             xfree(fname);
 846             return false;
 847         }
 848         b->content_session_id.assign(xx, 6);
 849         WRBUF w = wrbuf_alloc();
 850         wrbuf_puts(w, "#content_proxy\n");
 851         wrbuf_printf(w, "connector: %s\n", b->sptr->contentConnector.c_str());
 852         if (authentication.length())
 853             wrbuf_printf(w, "auth: %s\n", authentication.c_str());
 854         if (proxy.length())
 855             wrbuf_printf(w, "proxy: %s\n", proxy.c_str());
 856         if (realm.length())
 857             wrbuf_printf(w, "realm: %s\n", realm.c_str());
 858
 859         fwrite(wrbuf_buf(w), 1, wrbuf_len(w), file);
 860         fclose(file);
 861         package.log("zoom", YLOG_LOG, "content file: %s", fname);
 862         xfree(fname);
 863         wrbuf_destroy(w);
 864     }
 865     return true;
 866 }
 867
 868 yf::Zoom::BackendPtr yf::Zoom::Frontend::get_backend_from_databases(
 869     mp::Package &package,
 870     std::string &database, int *error, char **addinfo, mp::odr &odr,
 871     int *proxy_step)
 872 {
 873     std::list<BackendPtr>::const_iterator map_it;
 874     if (m_backend && !m_backend->enable_explain &&
 875         m_backend->m_frontend_database == database)
 876         return m_backend;
 877
 878     std::string input_args;
 879     std::string torus_db;
 880     size_t db_arg_pos = database.find(',');
 881     if (db_arg_pos != std::string::npos)
 882     {
 883         torus_db = database.substr(0, db_arg_pos);
 884         input_args = database.substr(db_arg_pos + 1);
 885     }
 886     else
 887         torus_db = database;
 888
 889     std::string authentication;
 890     std::string content_authentication;
 891     std::string proxy;
 892     std::string content_proxy;
 893     std::string realm = m_p->default_realm;
 894
 895     const char *param_user = 0;
 896     const char *param_password = 0;
 897     const char *param_content_user = 0;
 898     const char *param_content_password = 0;
 899     const char *param_nocproxy = 0;
 900     int no_parms = 0;
 901
 902     char **names;
 903     char **values;
 904     int no_out_args = 0;
 905     if (input_args.length())
 906         no_parms = yaz_uri_to_array(input_args.c_str(),
 907                                     odr, &names, &values);
 908     // adding 10 because we'll be adding other URL args
 909     const char **out_names = (const char **)
 910         odr_malloc(odr, (10 + no_parms) * sizeof(*out_names));
 911     const char **out_values = (const char **)
 912         odr_malloc(odr, (10 + no_parms) * sizeof(*out_values));
 913
 914     // may be changed if it's a content connection
 915     std::string torus_url = m_p->torus_searchable_url;
 916     int i;
 917     for (i = 0; i < no_parms; i++)
 918     {
 919         const char *name = names[i];
 920         const char *value = values[i];
 921         assert(name);
 922         assert(value);
 923         if (!strcmp(name, "user"))
 924             param_user = value;
 925         else if (!strcmp(name, "password"))
 926             param_password = value;
 927         else if (!strcmp(name, "content-user"))
 928             param_content_user = value;
 929         else if (!strcmp(name, "content-password"))
 930             param_content_password = value;
 931         else if (!strcmp(name, "content-proxy"))
 932             content_proxy = value;
 933         else if (!strcmp(name, "nocproxy"))
 934             param_nocproxy = value;
 935         else if (!strcmp(name, "proxy"))
 936         {
 937             char **dstr;
 938             int dnum = 0;
 939             nmem_strsplit(((ODR) odr)->mem, ",", value, &dstr, &dnum);
 940             if (*proxy_step >= dnum)
 941                 *proxy_step = 0;
 942             else
 943             {
 944                 proxy = dstr[*proxy_step];
 945
 946                 (*proxy_step)++;
 947                 if (*proxy_step == dnum)
 948                     *proxy_step = 0;
 949             }
 950         }
 951         else if (!strcmp(name, "cproxysession"))
 952         {
 953             out_names[no_out_args] = name;
 954             out_values[no_out_args++] = value;
 955             torus_url = m_p->torus_content_url;
 956         }
 957         else if (!strcmp(name, "realm"))
 958             realm = value;
 959         else if (name[0] == 'x' && name[1] == '-')
 960         {
 961             out_names[no_out_args] = name;
 962             out_values[no_out_args++] = value;
 963         }
 964         else
 965         {
 966             BackendPtr notfound;
 967             char *msg = (char*) odr_malloc(odr, strlen(name) + 30);
 968             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
 969             sprintf(msg, "Bad database argument: %s", name);
 970             *addinfo = msg;
 971             return notfound;
 972         }
 973     }
 974     if (param_user)
 975     {
 976         authentication = std::string(param_user);
 977         if (param_password)
 978             authentication += "/" + std::string(param_password);
 979     }
 980     if (param_content_user)
 981     {
 982         content_authentication = std::string(param_content_user);
 983         if (param_content_password)
 984             content_authentication += "/" + std::string(param_content_password);
 985     }
 986
 987     if (torus_db.compare("IR-Explain---1") == 0)
 988         return explain_search(package, database, error, addinfo, odr, torus_db,
 989             realm);
 990
 991     SearchablePtr sptr;
 992
 993     std::map<std::string,SearchablePtr>::iterator it;
 994     it = m_p->s_map.find(torus_db);
 995     if (it != m_p->s_map.end())
 996         sptr = it->second;
 997     else if (torus_url.length() > 0)
 998     {
 999         std::string torus_query = "udb==" + torus_db;
1000         xmlDoc *doc = mp::get_searchable(package,torus_url, torus_db,
1001                                          torus_query,
1002                                          realm, m_p->proxy);
1003         if (!doc)
1004         {
1005             *error = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
1006             *addinfo = odr_strdup(odr, database.c_str());
1007             BackendPtr b;
1008             return b;
1009         }
1010         const xmlNode *ptr = xmlDocGetRootElement(doc);
1011         if (ptr)
1012         {   // presumably ptr is a records element node
1013             // parse first record in document
1014             for (ptr = ptr->children; ptr; ptr = ptr->next)
1015             {
1016                 if (ptr->type == XML_ELEMENT_NODE
1017                     && !strcmp((const char *) ptr->name, "record"))
1018                 {
1019                     if (sptr)
1020                     {
1021                         *error = YAZ_BIB1_UNSPECIFIED_ERROR;
1022                         *addinfo = (char*) odr_malloc(odr, 40 + database.length()),
1023                         sprintf(*addinfo, "multiple records for udb=%s",
1024                                  database.c_str());
1025                         xmlFreeDoc(doc);
1026                         BackendPtr b;
1027                         return b;
1028                     }
1029                     sptr = m_p->parse_torus_record(ptr);
1030                 }
1031             }
1032         }
1033         xmlFreeDoc(doc);
1034     }
1035
1036     if (!sptr)
1037     {
1038         *error = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
1039         *addinfo = odr_strdup(odr, database.c_str());
1040         BackendPtr b;
1041         return b;
1042     }
1043
1044     xsltStylesheetPtr xsp = 0;
1045     if (sptr->transform_xsl_content.length())
1046     {
1047         xmlDoc *xsp_doc = xmlParseMemory(sptr->transform_xsl_content.c_str(),
1048                                          sptr->transform_xsl_content.length());
1049         if (!xsp_doc)
1050         {
1051             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
1052             *addinfo = (char *) odr_malloc(odr, 40);
1053             sprintf(*addinfo, "xmlParseMemory failed");
1054             BackendPtr b;
1055             return b;
1056         }
1057         xsp = xsltParseStylesheetDoc(xsp_doc);
1058         if (!xsp)
1059         {
1060             *error = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
1061             *addinfo = odr_strdup(odr, "xsltParseStylesheetDoc failed");
1062             BackendPtr b;
1063             xmlFreeDoc(xsp_doc);
1064             return b;
1065         }
1066     }
1067     else if (sptr->transform_xsl_fname.length())
1068     {
1069         const char *path = 0;
1070
1071         if (m_p->xsldir.length())
1072             path = m_p->xsldir.c_str();
1073         else
1074             path = m_p->file_path.c_str();
1075         std::string fname;
1076
1077         char fullpath[1024];
1078         char *cp = yaz_filepath_resolve(sptr->transform_xsl_fname.c_str(),
1079                                         path, 0, fullpath);
1080         if (cp)
1081             fname.assign(cp);
1082         else
1083         {
1084             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
1085             *addinfo = (char *)
1086                 odr_malloc(odr, 40 + sptr->transform_xsl_fname.length());
1087             sprintf(*addinfo, "File could not be read: %s",
1088                     sptr->transform_xsl_fname.c_str());
1089             BackendPtr b;
1090             return b;
1091         }
1092         xmlDoc *xsp_doc = xmlParseFile(fname.c_str());
1093         if (!xsp_doc)
1094         {
1095             *error = YAZ_BIB1_TEMPORARY_SYSTEM_ERROR;
1096             *addinfo = (char *) odr_malloc(odr, 40 + fname.length());
1097             sprintf(*addinfo, "xmlParseFile failed. File: %s", fname.c_str());
1098             BackendPtr b;
1099             return b;
1100         }
1101         xsp = xsltParseStylesheetDoc(xsp_doc);
1102         if (!xsp)
1103         {
1104             *error = YAZ_BIB1_DATABASE_DOES_NOT_EXIST;
1105             *addinfo = odr_strdup(odr, "xsltParseStylesheetDoc failed");
1106             BackendPtr b;
1107             xmlFreeDoc(xsp_doc);
1108             return b;
1109         }
1110     }
1111
1112     m_backend.reset();
1113
1114     BackendPtr b(new Backend);
1115
1116     b->sptr = sptr;
1117     b->xsp = xsp;
1118     b->m_frontend_database = database;
1119     b->enable_cproxy = param_nocproxy ? false : true;
1120
1121     if (sptr->query_encoding.length())
1122         b->set_option("rpnCharset", sptr->query_encoding);
1123
1124     b->set_option("timeout", m_p->zoom_timeout.c_str());
1125
1126     if (m_p->apdu_log)
1127         b->set_option("apdulog", "1");
1128
1129     if (sptr->piggyback && sptr->sru.length())
1130         b->set_option("count", "1"); /* some SRU servers INSIST on getting
1131                                         maximumRecords > 0 */
1132     b->set_option("piggyback", sptr->piggyback ? "1" : "0");
1133
1134     if (authentication.length() == 0)
1135         authentication = sptr->authentication;
1136
1137     if (proxy.length() == 0)
1138         proxy = sptr->cfProxy;
1139
1140     if (sptr->cfAuth.length())
1141     {
1142         // A CF target
1143         b->set_option("user", sptr->cfAuth);
1144         if (authentication.length())
1145         {
1146             size_t found = authentication.find('/');
1147             if (found != std::string::npos)
1148             {
1149                 out_names[no_out_args] = "user";
1150                 out_values[no_out_args++] =
1151                     odr_strdup(odr, authentication.substr(0, found).c_str());
1152
1153                 out_names[no_out_args] = "password";
1154                 out_values[no_out_args++] =
1155                     odr_strdup(odr, authentication.substr(found+1).c_str());
1156             }
1157             else
1158             {
1159                 out_names[no_out_args] = "user";
1160                 out_values[no_out_args++] =
1161                     odr_strdup(odr, authentication.c_str());
1162             }
1163         }
1164         if (proxy.length())
1165         {
1166             out_names[no_out_args] = "proxy";
1167             out_values[no_out_args++] = odr_strdup(odr, proxy.c_str());
1168         }
1169         if (sptr->cfSubDB.length())
1170         {
1171             out_names[no_out_args] = "subdatabase";
1172             out_values[no_out_args++] = odr_strdup(odr, sptr->cfSubDB.c_str());
1173         }
1174         if (param_nocproxy)
1175         {
1176             out_names[no_out_args] = "nocproxy";
1177             out_values[no_out_args++] = odr_strdup(odr, param_nocproxy);
1178         }
1179     }
1180     else
1181     {
1182         size_t found = authentication.find('/');
1183
1184         if (sptr->sru.length() && found != std::string::npos)
1185         {
1186             b->set_option("user", authentication.substr(0, found));
1187             b->set_option("password", authentication.substr(found+1));
1188         }
1189         else
1190             b->set_option("user", authentication);
1191
1192         if (proxy.length())
1193             b->set_option("proxy", proxy);
1194     }
1195     if (proxy.length())
1196         package.log("zoom", YLOG_LOG, "proxy: %s", proxy.c_str());
1197
1198     std::string url;
1199     if (sptr->sru.length())
1200     {
1201         url = "http://" + sptr->target;
1202         b->set_option("sru", sptr->sru);
1203
1204         if (sptr->sru_version.length())
1205             b->set_option("sru_version", sptr->sru_version);
1206     }
1207     else
1208     {
1209         url = sptr->target;
1210     }
1211     if (no_out_args)
1212     {
1213         char *x_args = 0;
1214         out_names[no_out_args] = 0; // terminate list
1215
1216         yaz_array_to_uri(&x_args, odr, (char **) out_names,
1217                          (char **) out_values);
1218         url += "," + std::string(x_args);
1219     }
1220     package.log("zoom", YLOG_LOG, "url: %s", url.c_str());
1221     b->connect(url, error, addinfo, odr);
1222     if (*error == 0 && b->enable_cproxy)
1223         create_content_session(package, b, error, addinfo, odr,
1224                                content_authentication.length() ?
1225                                content_authentication : authentication,
1226                                content_proxy.length() ? content_proxy : proxy,
1227                                realm);
1228     if (*error == 0)
1229         m_backend = b;
1230     return b;
1231 }
1232
1233 void yf::Zoom::Frontend::prepare_elements(BackendPtr b,
1234                                           Odr_oid *preferredRecordSyntax,
1235                                           const char *element_set_name,
1236                                           bool &enable_pz2_retrieval,
1237                                           bool &enable_pz2_transform,
1238                                           bool &enable_record_transform,
1239                                           bool &assume_marc8_charset)
1240 {
1241     char oid_name_str[OID_STR_MAX];
1242     const char *syntax_name = 0;
1243
1244     if (preferredRecordSyntax &&
1245         !oid_oidcmp(preferredRecordSyntax, yaz_oid_recsyn_xml)
1246         && element_set_name)
1247     {
1248         if (!strcmp(element_set_name, m_p->element_transform.c_str()))
1249         {
1250             enable_pz2_retrieval = true;
1251             enable_pz2_transform = true;
1252         }
1253         else if (!strcmp(element_set_name, m_p->element_raw.c_str()))
1254         {
1255             enable_pz2_retrieval = true;
1256         }
1257         else
1258         {
1259             enable_pz2_retrieval = true;
1260             enable_pz2_transform = true;
1261             enable_record_transform = true;
1262         }
1263     }
1264
1265     if (enable_pz2_retrieval)
1266     {
1267         std::string configured_request_syntax = b->sptr->request_syntax;
1268         if (configured_request_syntax.length())
1269         {
1270             syntax_name = configured_request_syntax.c_str();
1271             const Odr_oid *syntax_oid =
1272                 yaz_string_to_oid(yaz_oid_std(), CLASS_RECSYN, syntax_name);
1273             if (!oid_oidcmp(syntax_oid, yaz_oid_recsyn_usmarc)
1274                 || !oid_oidcmp(syntax_oid, yaz_oid_recsyn_opac))
1275                 assume_marc8_charset = true;
1276         }
1277     }
1278     else if (preferredRecordSyntax)
1279         syntax_name =
1280             yaz_oid_to_string_buf(preferredRecordSyntax, 0, oid_name_str);
1281
1282     if (b->sptr->sru.length())
1283         syntax_name = "XML";
1284
1285     b->set_option("preferredRecordSyntax", syntax_name);
1286
1287     if (enable_pz2_retrieval)
1288     {
1289         element_set_name = 0;
1290         if (b->sptr->element_set.length())
1291             element_set_name = b->sptr->element_set.c_str();
1292     }
1293
1294     b->set_option("elementSetName", element_set_name);
1295     if (b->sptr->sru.length() && element_set_name)
1296         b->set_option("schema", element_set_name);
1297 }
1298
1299 Z_Records *yf::Zoom::Frontend::get_explain_records(
1300     Package &package,
1301     Odr_int start,
1302     Odr_int number_to_present,
1303     int *error,
1304     char **addinfo,
1305     Odr_int *number_of_records_returned,
1306     ODR odr,
1307     BackendPtr b,
1308     Odr_oid *preferredRecordSyntax,
1309     const char *element_set_name)
1310 {
1311     Odr_int i;
1312     Z_Records *records = 0;
1313
1314     if (!b->explain_doc)
1315     {
1316         return records;
1317     }
1318     if (number_to_present > 10000)
1319         number_to_present = 10000;
1320
1321     xmlNode *ptr = xmlDocGetRootElement(b->explain_doc);
1322
1323     Z_NamePlusRecordList *npl = (Z_NamePlusRecordList *)
1324         odr_malloc(odr, sizeof(*npl));
1325     npl->records = (Z_NamePlusRecord **)
1326         odr_malloc(odr, number_to_present * sizeof(*npl->records));
1327
1328     for (i = 0; i < number_to_present; i++)
1329     {
1330         int num = 0;
1331         xmlNode *res = xml_node_search(ptr, &num, start + i + 1);
1332         if (!res)
1333             break;
1334         xmlBufferPtr xml_buf = xmlBufferCreate();
1335         xmlNode *tmp_node = xmlCopyNode(res->children, 1);
1336         xmlNodeDump(xml_buf, tmp_node->doc, tmp_node, 0, 0);
1337
1338         Z_NamePlusRecord *npr =
1339             (Z_NamePlusRecord *) odr_malloc(odr, sizeof(*npr));
1340         npr->databaseName = odr_strdup(odr, b->m_frontend_database.c_str());
1341         npr->which = Z_NamePlusRecord_databaseRecord;
1342         npr->u.databaseRecord =
1343             z_ext_record_xml(odr,
1344                              (const char *) xml_buf->content, xml_buf->use);
1345         npl->records[i] = npr;
1346         xmlFreeNode(tmp_node);
1347         xmlBufferFree(xml_buf);
1348     }
1349     records = (Z_Records*) odr_malloc(odr, sizeof(*records));
1350     records->which = Z_Records_DBOSD;
1351     records->u.databaseOrSurDiagnostics = npl;
1352
1353     npl->num_records = i;
1354     *number_of_records_returned = i;
1355     return records;
1356 }
1357
1358
1359 Z_Records *yf::Zoom::Frontend::get_records(Package &package,
1360                                            Odr_int start,
1361                                            Odr_int number_to_present,
1362                                            int *error,
1363                                            char **addinfo,
1364                                            Odr_int *number_of_records_returned,
1365                                            ODR odr,
1366                                            BackendPtr b,
1367                                            Odr_oid *preferredRecordSyntax,
1368                                            const char *element_set_name)
1369 {
1370     *number_of_records_returned = 0;
1371     Z_Records *records = 0;
1372     bool enable_pz2_retrieval = false; // whether target profile is used
1373     bool enable_pz2_transform = false; // whether XSLT is used as well
1374     bool assume_marc8_charset = false;
1375     bool enable_record_transform = false;
1376
1377     prepare_elements(b, preferredRecordSyntax,
1378                      element_set_name,
1379                      enable_pz2_retrieval,
1380                      enable_pz2_transform,
1381                      enable_record_transform,
1382                      assume_marc8_charset);
1383
1384     package.log("zoom", YLOG_LOG, "pz2_retrieval: %s . pz2_transform: %s",
1385                 enable_pz2_retrieval ? "yes" : "no",
1386                 enable_pz2_transform ? "yes" : "no");
1387
1388     if (start < 0 || number_to_present <=0)
1389         return records;
1390
1391     if (number_to_present > 10000)
1392         number_to_present = 10000;
1393
1394     ZOOM_record *recs = (ZOOM_record *)
1395         odr_malloc(odr, (size_t) number_to_present * sizeof(*recs));
1396
1397     b->present(start, number_to_present, recs, error, addinfo, odr);
1398
1399     int i = 0;
1400     if (!*error)
1401     {
1402         for (i = 0; i < number_to_present; i++)
1403             if (!recs[i])
1404                 break;
1405     }
1406     if (i > 0)
1407     {  // only return records if no error and at least one record
1408
1409         const char *xsl_parms[3];
1410         char cproxy_host[1024];
1411
1412         if (b->enable_cproxy && b->content_session_id.length())
1413         {
1414             sprintf(cproxy_host, "%s.%s/",
1415                     b->content_session_id.c_str(),
1416                     m_p->content_proxy_server.c_str());
1417
1418             char *q_cproxy_host = (char *)
1419                 odr_malloc(odr, strlen(cproxy_host) + 3);
1420             strcpy(q_cproxy_host, "\"");
1421             strcat(q_cproxy_host, cproxy_host);
1422             strcat(q_cproxy_host, "\"");
1423
1424             xsl_parms[0] = "cproxyhost";
1425             xsl_parms[1] = q_cproxy_host;
1426             xsl_parms[2] = 0;
1427         }
1428         else
1429         {
1430             xsl_parms[0] = 0;
1431             *cproxy_host = '\0';
1432         }
1433
1434         char *odr_database = odr_strdup(odr,
1435                                         b->m_frontend_database.c_str());
1436         Z_NamePlusRecordList *npl = (Z_NamePlusRecordList *)
1437             odr_malloc(odr, sizeof(*npl));
1438         *number_of_records_returned = i;
1439         npl->num_records = i;
1440         npl->records = (Z_NamePlusRecord **)
1441             odr_malloc(odr, i * sizeof(*npl->records));
1442         for (i = 0; i < number_to_present; i++)
1443         {
1444             Z_NamePlusRecord *npr = 0;
1445             const char *addinfo;
1446
1447             int sur_error = ZOOM_record_error(recs[i], 0 /* msg */,
1448                                               &addinfo, 0 /* diagset */);
1449
1450             if (sur_error)
1451             {
1452                 log_diagnostic(package, sur_error, addinfo);
1453                 npr = zget_surrogateDiagRec(odr, odr_database, sur_error,
1454                                             addinfo);
1455             }
1456             else if (enable_pz2_retrieval)
1457             {
1458                 char rec_type_str[100];
1459                 const char *record_encoding = 0;
1460
1461                 if (b->sptr->record_encoding.length())
1462                     record_encoding = b->sptr->record_encoding.c_str();
1463                 else if (assume_marc8_charset)
1464                     record_encoding = "marc8";
1465
1466                 strcpy(rec_type_str, b->sptr->use_turbomarc ? "txml" : "xml");
1467                 if (record_encoding)
1468                 {
1469                     strcat(rec_type_str, "; charset=");
1470                     strcat(rec_type_str, record_encoding);
1471                 }
1472
1473                 package.log("zoom", YLOG_LOG, "Getting record of type %s",
1474                             rec_type_str);
1475                 int rec_len;
1476                 xmlChar *xmlrec_buf = 0;
1477                 const char *rec_buf = ZOOM_record_get(recs[i], rec_type_str,
1478                                                       &rec_len);
1479                 if (!rec_buf && !npr)
1480                 {
1481                     std::string addinfo("ZOOM_record_get failed for type ");
1482
1483                     int error = YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS;
1484                     addinfo += rec_type_str;
1485                     log_diagnostic(package, error, addinfo.c_str());
1486                     npr = zget_surrogateDiagRec(odr, odr_database,
1487                                                 error, addinfo.c_str());
1488                 }
1489                 else
1490                 {
1491                     package.log_write(rec_buf, rec_len);
1492                     package.log_write("\r\n", 2);
1493                 }
1494
1495                 if (rec_buf && b->xsp && enable_pz2_transform)
1496                 {
1497                     xmlDoc *rec_doc = xmlParseMemory(rec_buf, rec_len);
1498                     if (!rec_doc)
1499                     {
1500                         const char *addinfo = "xml parse failed for record";
1501                         int error = YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS;
1502                         log_diagnostic(package, error, addinfo);
1503                         npr = zget_surrogateDiagRec(
1504                             odr, odr_database, error, addinfo);
1505                     }
1506                     else
1507                     {
1508                         xsltStylesheetPtr xsp = b->xsp;
1509                         xmlDoc *rec_res = xsltApplyStylesheet(xsp, rec_doc,
1510                                                               xsl_parms);
1511                         if (rec_res && m_p->record_xsp &&
1512                             enable_record_transform)
1513                         {
1514                             xmlDoc *tmp_doc = rec_res;
1515
1516                             xsp = m_p->record_xsp;
1517                             rec_res = xsltApplyStylesheet(xsp, tmp_doc,
1518                                                           xsl_parms);
1519                             xmlFreeDoc(tmp_doc);
1520                         }
1521                         if (rec_res)
1522                         {
1523                             xsltSaveResultToString(&xmlrec_buf, &rec_len,
1524                                                    rec_res, xsp);
1525                             rec_buf = (const char *) xmlrec_buf;
1526                             package.log("zoom", YLOG_LOG, "xslt successful");
1527                             package.log_write(rec_buf, rec_len);
1528
1529                             xmlFreeDoc(rec_res);
1530                         }
1531                         if (!rec_buf)
1532                         {
1533                             std::string addinfo;
1534                             int error =
1535                                 YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS;
1536
1537                             addinfo = "xslt apply failed for "
1538                                 + b->sptr->transform_xsl_fname;
1539                             log_diagnostic(package, error, addinfo.c_str());
1540                             npr = zget_surrogateDiagRec(
1541                                 odr, odr_database, error, addinfo.c_str());
1542                         }
1543                         xmlFreeDoc(rec_doc);
1544                     }
1545                 }
1546
1547                 if (rec_buf)
1548                 {
1549                     xmlDoc *doc = xmlParseMemory(rec_buf, rec_len);
1550                     std::string res =
1551                         mp::xml::url_recipe_handle(doc, b->sptr->urlRecipe);
1552                     if (res.length() && *cproxy_host)
1553                     {
1554                         size_t off = res.find_first_of("://");
1555                         if (off != std::string::npos)
1556                             res.insert(off + 3, cproxy_host);
1557                     }
1558                     if (res.length())
1559                     {
1560                         xmlNode *ptr = xmlDocGetRootElement(doc);
1561                         while (ptr && ptr->type != XML_ELEMENT_NODE)
1562                             ptr = ptr->next;
1563                         xmlNode *c =
1564                             xmlNewChild(ptr, 0, BAD_CAST "metadata", 0);
1565                         xmlNewProp(c, BAD_CAST "type", BAD_CAST
1566                                    "generated-url");
1567                         xmlNode * t = xmlNewText(BAD_CAST res.c_str());
1568                         xmlAddChild(c, t);
1569
1570                         if (xmlrec_buf)
1571                             xmlFree(xmlrec_buf);
1572
1573                         xmlDocDumpMemory(doc, &xmlrec_buf, &rec_len);
1574                         rec_buf = (const char *) xmlrec_buf;
1575                     }
1576                     xmlFreeDoc(doc);
1577                 }
1578                 if (!npr)
1579                 {
1580                     if (!rec_buf)
1581                         npr = zget_surrogateDiagRec(
1582                             odr, odr_database,
1583                             YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS,
1584                             rec_type_str);
1585                     else
1586                     {
1587                         npr = (Z_NamePlusRecord *)
1588                             odr_malloc(odr, sizeof(*npr));
1589                         npr->databaseName = odr_database;
1590                         npr->which = Z_NamePlusRecord_databaseRecord;
1591                         npr->u.databaseRecord =
1592                             z_ext_record_xml(odr, rec_buf, rec_len);
1593                     }
1594                 }
1595                 if (xmlrec_buf)
1596                     xmlFree(xmlrec_buf);
1597             }
1598             else
1599             {
1600                 Z_External *ext =
1601                     (Z_External *) ZOOM_record_get(recs[i], "ext", 0);
1602                 if (ext)
1603                 {
1604                     npr = (Z_NamePlusRecord *) odr_malloc(odr, sizeof(*npr));
1605                     npr->databaseName = odr_database;
1606                     npr->which = Z_NamePlusRecord_databaseRecord;
1607                     npr->u.databaseRecord = ext;
1608                 }
1609                 else
1610                 {
1611                     npr = zget_surrogateDiagRec(
1612                         odr, odr_database,
1613                         YAZ_BIB1_SYSTEM_ERROR_IN_PRESENTING_RECORDS,
1614                         "ZOOM_record, type ext");
1615                 }
1616             }
1617             npl->records[i] = npr;
1618         }
1619         records = (Z_Records*) odr_malloc(odr, sizeof(*records));
1620         records->which = Z_Records_DBOSD;
1621         records->u.databaseOrSurDiagnostics = npl;
1622     }
1623     return records;
1624 }
1625
1626 struct cql_node *yf::Zoom::Impl::convert_cql_fields(struct cql_node *cn,
1627                                                     ODR odr)
1628 {
1629     struct cql_node *r = 0;
1630     if (!cn)
1631         return 0;
1632     switch (cn->which)
1633     {
1634     case CQL_NODE_ST:
1635         if (cn->u.st.index)
1636         {
1637             std::map<std::string,std::string>::const_iterator it;
1638             it = fieldmap.find(cn->u.st.index);
1639             if (it == fieldmap.end())
1640                 return cn;
1641             if (it->second.length())
1642                 cn->u.st.index = odr_strdup(odr, it->second.c_str());
1643             else
1644                 cn->u.st.index = 0;
1645         }
1646         break;
1647     case CQL_NODE_BOOL:
1648         r = convert_cql_fields(cn->u.boolean.left, odr);
1649         if (!r)
1650             r = convert_cql_fields(cn->u.boolean.right, odr);
1651         break;
1652     case CQL_NODE_SORT:
1653         r = convert_cql_fields(cn->u.sort.search, odr);
1654         break;
1655     }
1656     return r;
1657 }
1658
1659 void yf::Zoom::Frontend::log_diagnostic(mp::Package &package,
1660                                         int error, const char *addinfo)
1661 {
1662     const char *err_msg = yaz_diag_bib1_str(error);
1663     if (addinfo)
1664         package.log("zoom", YLOG_WARN, "Diagnostic %d %s: %s",
1665                     error, err_msg, addinfo);
1666     else
1667         package.log("zoom", YLOG_WARN, "Diagnostic %d %s:",
1668                     error, err_msg);
1669 }
1670
1671 yf::Zoom::BackendPtr yf::Zoom::Frontend::explain_search(mp::Package &package,
1672                                                         std::string &database,
1673                                                         int *error,
1674                                                         char **addinfo,
1675                                                         mp::odr &odr,
1676                                                         std::string &torus_db,
1677                                                         std::string &realm)
1678 {
1679     m_backend.reset();
1680
1681     BackendPtr b(new Backend);
1682
1683     b->m_frontend_database = database;
1684     b->enable_explain = true;
1685
1686     Z_GDU *gdu = package.request().get();
1687     Z_APDU *apdu_req = gdu->u.z3950;
1688     Z_SearchRequest *sr = apdu_req->u.searchRequest;
1689     Z_Query *query = sr->query;
1690
1691     if (!m_p->explain_xsp)
1692     {
1693         *error = YAZ_BIB1_UNSPECIFIED_ERROR;
1694         *addinfo =
1695             odr_strdup(odr, "IR-Explain---1 unsupported. "
1696                        "Torus explain_xsl not defined");
1697         return m_backend;
1698     }
1699     else if (query->which == Z_Query_type_104 &&
1700         query->u.type_104->which == Z_External_CQL)
1701     {
1702         std::string torus_url = m_p->torus_searchable_url;
1703         std::string torus_query(query->u.type_104->u.cql);
1704         xmlDoc *doc = mp::get_searchable(package, torus_url, "",
1705                                          torus_query,
1706                                          realm, m_p->proxy);
1707         if (m_p->explain_xsp)
1708         {
1709             xmlDoc *rec_res =  xsltApplyStylesheet(m_p->explain_xsp, doc, 0);
1710
1711             xmlFreeDoc(doc);
1712             doc = rec_res;
1713         }
1714         if (!doc)
1715         {
1716             *error = YAZ_BIB1_UNSPECIFIED_ERROR;
1717             *addinfo = odr_strdup(odr, "IR-Explain---1 problem. "
1718                                   "Could not obtain Torus records for Explain");
1719         }
1720         else
1721         {
1722             xmlNode *ptr = xmlDocGetRootElement(doc);
1723             int hits = 0;
1724
1725             xml_node_search(ptr, &hits, 0);
1726
1727             Z_APDU *apdu_res = odr.create_searchResponse(apdu_req, 0, 0);
1728             apdu_res->u.searchResponse->resultCount = odr_intdup(odr, hits);
1729             package.response() = apdu_res;
1730             m_backend = b;
1731         }
1732         if (b->explain_doc)
1733             xmlFreeDoc(b->explain_doc);
1734         b->explain_doc = doc;
1735         return m_backend;
1736     }
1737     else
1738     {
1739         *error = YAZ_BIB1_QUERY_TYPE_UNSUPP;
1740         *addinfo = odr_strdup(odr, "IR-Explain---1 only supports CQL");
1741         return m_backend;
1742     }
1743 }
1744
1745 void yf::Zoom::Frontend::handle_search(mp::Package &package)
1746 {
1747     Z_GDU *gdu = package.request().get();
1748     Z_APDU *apdu_req = gdu->u.z3950;
1749     Z_APDU *apdu_res = 0;
1750     mp::odr odr;
1751     Z_SearchRequest *sr = apdu_req->u.searchRequest;
1752     if (sr->num_databaseNames != 1)
1753     {
1754         int error = YAZ_BIB1_TOO_MANY_DATABASES_SPECIFIED;
1755         log_diagnostic(package, error, 0);
1756         apdu_res = odr.create_searchResponse(apdu_req, error, 0);
1757         package.response() = apdu_res;
1758         return;
1759     }
1760     int proxy_step = 0;
1761
1762 next_proxy:
1763
1764     int error = 0;
1765     char *addinfo = 0;
1766     std::string db(sr->databaseNames[0]);
1767
1768     BackendPtr b = get_backend_from_databases(package, db, &error,
1769                                               &addinfo, odr, &proxy_step);
1770     if (error && proxy_step)
1771     {
1772         package.log("zoom", YLOG_WARN,
1773                     "create backend failed: trying next proxy");
1774         goto next_proxy;
1775     }
1776     if (error)
1777     {
1778         log_diagnostic(package, error, addinfo);
1779         apdu_res = odr.create_searchResponse(apdu_req, error, addinfo);
1780         package.response() = apdu_res;
1781         return;
1782     }
1783     if (!b || b->enable_explain)
1784         return;
1785
1786     b->set_option("setname", "default");
1787
1788     bool enable_pz2_retrieval = false;
1789     bool enable_pz2_transform = false;
1790     bool enable_record_transform = false;
1791     bool assume_marc8_charset = false;
1792     prepare_elements(b, sr->preferredRecordSyntax, 0 /*element_set_name */,
1793                      enable_pz2_retrieval,
1794                      enable_pz2_transform,
1795                      enable_record_transform,
1796                      assume_marc8_charset);
1797
1798     Odr_int hits = 0;
1799     Z_Query *query = sr->query;
1800     WRBUF ccl_wrbuf = 0;
1801     WRBUF pqf_wrbuf = 0;
1802     std::string sortkeys;
1803
1804     if (query->which == Z_Query_type_1 || query->which == Z_Query_type_101)
1805     {
1806         // RPN
1807         pqf_wrbuf = wrbuf_alloc();
1808         yaz_rpnquery_to_wrbuf(pqf_wrbuf, query->u.type_1);
1809     }
1810     else if (query->which == Z_Query_type_2)
1811     {
1812         // CCL
1813         ccl_wrbuf = wrbuf_alloc();
1814         wrbuf_write(ccl_wrbuf, (const char *) query->u.type_2->buf,
1815                     query->u.type_2->len);
1816     }
1817     else if (query->which == Z_Query_type_104 &&
1818              query->u.type_104->which == Z_External_CQL)
1819     {
1820         // CQL
1821         const char *cql = query->u.type_104->u.cql;
1822         CQL_parser cp = cql_parser_create();
1823         int r = cql_parser_string(cp, cql);
1824         package.log("zoom", YLOG_LOG, "CQL: %s", cql);
1825         if (r)
1826         {
1827             cql_parser_destroy(cp);
1828             error = YAZ_BIB1_MALFORMED_QUERY;
1829             const char *addinfo = "CQL syntax error";
1830             log_diagnostic(package, error, addinfo);
1831             apdu_res =
1832                 odr.create_searchResponse(apdu_req, error, addinfo);
1833             package.response() = apdu_res;
1834             return;
1835         }
1836         struct cql_node *cn = cql_parser_result(cp);
1837         struct cql_node *cn_error = m_p->convert_cql_fields(cn, odr);
1838         if (cn_error)
1839         {
1840             // hopefully we are getting a ptr to a index+relation+term node
1841             error = YAZ_BIB1_UNSUPP_USE_ATTRIBUTE;
1842             addinfo = 0;
1843             if (cn_error->which == CQL_NODE_ST)
1844                 addinfo = cn_error->u.st.index;
1845
1846             log_diagnostic(package, error, addinfo);
1847             apdu_res = odr.create_searchResponse(apdu_req, error, addinfo);
1848             package.response() = apdu_res;
1849             cql_parser_destroy(cp);
1850             return;
1851         }
1852         char ccl_buf[1024];
1853         r = cql_to_ccl_buf(cn, ccl_buf, sizeof(ccl_buf));
1854         if (r)
1855         {
1856             error = YAZ_BIB1_MALFORMED_QUERY;
1857             const char *addinfo = "CQL to CCL conversion error";
1858
1859             log_diagnostic(package, error, addinfo);
1860             apdu_res = odr.create_searchResponse(apdu_req, error, addinfo);
1861             package.response() = apdu_res;
1862             cql_parser_destroy(cp);
1863             return;
1864         }
1865
1866         WRBUF sru_sortkeys_wrbuf = wrbuf_alloc();
1867         if (cql_sortby_to_sortkeys(cn, wrbuf_vp_puts, sru_sortkeys_wrbuf))
1868         {
1869             error = YAZ_BIB1_ILLEGAL_SORT_RELATION;
1870             const char *addinfo = "CQL to CCL sortby conversion";
1871
1872             log_diagnostic(package, error, addinfo);
1873             apdu_res = odr.create_searchResponse(apdu_req, error, addinfo);
1874             package.response() = apdu_res;
1875             wrbuf_destroy(sru_sortkeys_wrbuf);
1876             cql_parser_destroy(cp);
1877             return;
1878         }
1879         WRBUF sort_spec_wrbuf = wrbuf_alloc();
1880         yaz_srw_sortkeys_to_sort_spec(wrbuf_cstr(sru_sortkeys_wrbuf),
1881                                       sort_spec_wrbuf);
1882         wrbuf_destroy(sru_sortkeys_wrbuf);
1883
1884         ccl_wrbuf = wrbuf_alloc();
1885         wrbuf_puts(ccl_wrbuf, ccl_buf);
1886
1887         yaz_tok_cfg_t tc = yaz_tok_cfg_create();
1888         yaz_tok_parse_t tp =
1889             yaz_tok_parse_buf(tc, wrbuf_cstr(sort_spec_wrbuf));
1890         yaz_tok_cfg_destroy(tc);
1891
1892         /* go through sortspec and map fields */
1893         int token = yaz_tok_move(tp);
1894         while (token != YAZ_TOK_EOF)
1895         {
1896             if (token == YAZ_TOK_STRING)
1897             {
1898                 const char *field = yaz_tok_parse_string(tp);
1899                 std::map<std::string,std::string>::iterator it;
1900                 it = b->sptr->sortmap.find(field);
1901                 if (it != b->sptr->sortmap.end())
1902                     sortkeys += it->second;
1903                 else
1904                     sortkeys += field;
1905             }
1906             sortkeys += " ";
1907             token = yaz_tok_move(tp);
1908             if (token == YAZ_TOK_STRING)
1909             {
1910                 sortkeys += yaz_tok_parse_string(tp);
1911             }
1912             if (token != YAZ_TOK_EOF)
1913             {
1914                 sortkeys += " ";
1915                 token = yaz_tok_move(tp);
1916             }
1917         }
1918         yaz_tok_parse_destroy(tp);
1919         wrbuf_destroy(sort_spec_wrbuf);
1920
1921         cql_parser_destroy(cp);
1922     }
1923     else
1924     {
1925         error = YAZ_BIB1_QUERY_TYPE_UNSUPP;
1926         const char *addinfo = 0;
1927         log_diagnostic(package, error, addinfo);
1928         apdu_res =  odr.create_searchResponse(apdu_req, error, addinfo);
1929         package.response() = apdu_res;
1930         return;
1931     }
1932
1933     if (ccl_wrbuf)
1934     {
1935         // CCL to PQF
1936         assert(pqf_wrbuf == 0);
1937         int cerror, cpos;
1938         struct ccl_rpn_node *cn;
1939         package.log("zoom", YLOG_LOG, "CCL: %s", wrbuf_cstr(ccl_wrbuf));
1940         cn = ccl_find_str(b->sptr->ccl_bibset, wrbuf_cstr(ccl_wrbuf),
1941                           &cerror, &cpos);
1942         wrbuf_destroy(ccl_wrbuf);
1943         if (!cn)
1944         {
1945             char *addinfo = odr_strdup(odr, ccl_err_msg(cerror));
1946             error = YAZ_BIB1_MALFORMED_QUERY;
1947
1948             switch (cerror)
1949             {
1950             case CCL_ERR_UNKNOWN_QUAL:
1951             case CCL_ERR_TRUNC_NOT_LEFT:
1952             case CCL_ERR_TRUNC_NOT_RIGHT:
1953             case CCL_ERR_TRUNC_NOT_BOTH:
1954 #ifdef CCL_ERR_TRUNC_NOT_EMBED
1955             case CCL_ERR_TRUNC_NOT_EMBED:
1956 #endif
1957 #ifdef CCL_ERR_TRUNC_NOT_SINGLE
1958             case CCL_ERR_TRUNC_NOT_SINGLE:
1959 #endif
1960                 error = YAZ_BIB1_UNSUPP_SEARCH;
1961                 break;
1962             }
1963             log_diagnostic(package, error, addinfo);
1964             apdu_res = odr.create_searchResponse(apdu_req, error, addinfo);
1965             package.response() = apdu_res;
1966             return;
1967         }
1968         pqf_wrbuf = wrbuf_alloc();
1969         ccl_pquery(pqf_wrbuf, cn);
1970         package.log("zoom", YLOG_LOG, "RPN: %s", wrbuf_cstr(pqf_wrbuf));
1971         ccl_rpn_delete(cn);
1972     }
1973
1974     assert(pqf_wrbuf);
1975
1976     ZOOM_query q = ZOOM_query_create();
1977     ZOOM_query_sortby2(q, b->sptr->sortStrategy.c_str(), sortkeys.c_str());
1978
1979     if (b->get_option("sru"))
1980     {
1981         int status = 0;
1982         Z_RPNQuery *zquery;
1983         zquery = p_query_rpn(odr, wrbuf_cstr(pqf_wrbuf));
1984         WRBUF wrb = wrbuf_alloc();
1985
1986         if (!strcmp(b->get_option("sru"), "solr"))
1987         {
1988             solr_transform_t cqlt = solr_transform_create();
1989
1990             status = solr_transform_rpn2solr_wrbuf(cqlt, wrb, zquery);
1991
1992             solr_transform_close(cqlt);
1993         }
1994         else
1995         {
1996             cql_transform_t cqlt = cql_transform_create();
1997
1998             status = cql_transform_rpn2cql_wrbuf(cqlt, wrb, zquery);
1999
2000             cql_transform_close(cqlt);
2001         }
2002         if (status == 0)
2003         {
2004             ZOOM_query_cql(q, wrbuf_cstr(wrb));
2005             package.log("zoom", YLOG_LOG, "CQL: %s", wrbuf_cstr(wrb));
2006             b->search(q, &hits, &error, &addinfo, odr);
2007         }
2008         ZOOM_query_destroy(q);
2009
2010         wrbuf_destroy(wrb);
2011         wrbuf_destroy(pqf_wrbuf);
2012         if (status)
2013         {
2014             error = YAZ_BIB1_MALFORMED_QUERY;
2015             const char *addinfo = "can not convert from RPN to CQL/SOLR";
2016             log_diagnostic(package, error, addinfo);
2017             apdu_res = odr.create_searchResponse(apdu_req, error, addinfo);
2018             package.response() = apdu_res;
2019             return;
2020         }
2021     }
2022     else
2023     {
2024         ZOOM_query_prefix(q, wrbuf_cstr(pqf_wrbuf));
2025         package.log("zoom", YLOG_LOG, "search PQF: %s", wrbuf_cstr(pqf_wrbuf));
2026         b->search(q, &hits, &error, &addinfo, odr);
2027         ZOOM_query_destroy(q);
2028         wrbuf_destroy(pqf_wrbuf);
2029     }
2030
2031     if (error && proxy_step)
2032     {
2033         // reset below prevent reuse in get_backend_from_databases
2034         m_backend.reset();
2035         package.log("zoom", YLOG_WARN, "search failed: trying next proxy");
2036         goto next_proxy;
2037     }
2038
2039     const char *element_set_name = 0;
2040     Odr_int number_to_present = 0;
2041     if (!error)
2042         mp::util::piggyback_sr(sr, hits, number_to_present, &element_set_name);
2043
2044     Odr_int number_of_records_returned = 0;
2045     Z_Records *records = get_records(
2046         package,
2047         0, number_to_present, &error, &addinfo,
2048         &number_of_records_returned, odr, b, sr->preferredRecordSyntax,
2049         element_set_name);
2050     if (error)
2051         log_diagnostic(package, error, addinfo);
2052     apdu_res = odr.create_searchResponse(apdu_req, error, addinfo);
2053     if (records)
2054     {
2055         apdu_res->u.searchResponse->records = records;
2056         apdu_res->u.searchResponse->numberOfRecordsReturned =
2057             odr_intdup(odr, number_of_records_returned);
2058     }
2059     apdu_res->u.searchResponse->resultCount = odr_intdup(odr, hits);
2060     package.response() = apdu_res;
2061 }
2062
2063 void yf::Zoom::Frontend::handle_present(mp::Package &package)
2064 {
2065     Z_GDU *gdu = package.request().get();
2066     Z_APDU *apdu_req = gdu->u.z3950;
2067     Z_APDU *apdu_res = 0;
2068     Z_PresentRequest *pr = apdu_req->u.presentRequest;
2069
2070     mp::odr odr;
2071     if (!m_backend)
2072     {
2073         package.response() = odr.create_presentResponse(
2074             apdu_req, YAZ_BIB1_SPECIFIED_RESULT_SET_DOES_NOT_EXIST, 0);
2075         return;
2076     }
2077     const char *element_set_name = 0;
2078     Z_RecordComposition *comp = pr->recordComposition;
2079     if (comp && comp->which != Z_RecordComp_simple)
2080     {
2081         package.response() = odr.create_presentResponse(
2082             apdu_req,
2083             YAZ_BIB1_PRESENT_COMP_SPEC_PARAMETER_UNSUPP, 0);
2084         return;
2085     }
2086     if (comp && comp->u.simple->which == Z_ElementSetNames_generic)
2087         element_set_name = comp->u.simple->u.generic;
2088     Odr_int number_of_records_returned = 0;
2089     int error = 0;
2090     char *addinfo = 0;
2091
2092     if (m_backend->enable_explain)
2093     {
2094         Z_Records *records =
2095             get_explain_records(
2096                 package,
2097                 *pr->resultSetStartPoint - 1, *pr->numberOfRecordsRequested,
2098                 &error, &addinfo, &number_of_records_returned, odr, m_backend,
2099                 pr->preferredRecordSyntax, element_set_name);
2100
2101         apdu_res = odr.create_presentResponse(apdu_req, error, addinfo);
2102         if (records)
2103         {
2104             apdu_res->u.presentResponse->records = records;
2105             apdu_res->u.presentResponse->numberOfRecordsReturned =
2106                 odr_intdup(odr, number_of_records_returned);
2107         }
2108         package.response() = apdu_res;
2109     }
2110     else
2111     {
2112         Z_Records *records =
2113             get_records(package,
2114                         *pr->resultSetStartPoint - 1, *pr->numberOfRecordsRequested,
2115                         &error, &addinfo, &number_of_records_returned, odr, m_backend,
2116                         pr->preferredRecordSyntax, element_set_name);
2117
2118         apdu_res = odr.create_presentResponse(apdu_req, error, addinfo);
2119         if (records)
2120         {
2121             apdu_res->u.presentResponse->records = records;
2122             apdu_res->u.presentResponse->numberOfRecordsReturned =
2123                 odr_intdup(odr, number_of_records_returned);
2124         }
2125         package.response() = apdu_res;
2126     }
2127 }
2128
2129 void yf::Zoom::Frontend::handle_package(mp::Package &package)
2130 {
2131     Z_GDU *gdu = package.request().get();
2132     if (!gdu)
2133         ;
2134     else if (gdu->which == Z_GDU_Z3950)
2135     {
2136         Z_APDU *apdu_req = gdu->u.z3950;
2137
2138         if (m_backend)
2139             wrbuf_rewind(m_backend->m_apdu_wrbuf);
2140         if (apdu_req->which == Z_APDU_initRequest)
2141         {
2142             mp::odr odr;
2143             package.response() = odr.create_close(
2144                 apdu_req,
2145                 Z_Close_protocolError,
2146                 "double init");
2147         }
2148         else if (apdu_req->which == Z_APDU_searchRequest)
2149         {
2150             handle_search(package);
2151         }
2152         else if (apdu_req->which == Z_APDU_presentRequest)
2153         {
2154             handle_present(package);
2155         }
2156         else
2157         {
2158             mp::odr odr;
2159             package.response() = odr.create_close(
2160                 apdu_req,
2161                 Z_Close_protocolError,
2162                 "zoom filter cannot handle this APDU");
2163             package.session().close();
2164         }
2165         if (m_backend)
2166         {
2167             WRBUF w = m_backend->m_apdu_wrbuf;
2168             package.log_write(wrbuf_buf(w), wrbuf_len(w));
2169         }
2170     }
2171     else
2172     {
2173         package.session().close();
2174     }
2175 }
2176
2177 void yf::Zoom::Impl::process(mp::Package &package)
2178 {
2179     FrontendPtr f = get_frontend(package);
2180     Z_GDU *gdu = package.request().get();
2181
2182     if (f->m_is_virtual)
2183     {
2184         f->handle_package(package);
2185     }
2186     else if (gdu && gdu->which == Z_GDU_Z3950 && gdu->u.z3950->which ==
2187              Z_APDU_initRequest)
2188     {
2189         Z_InitRequest *req = gdu->u.z3950->u.initRequest;
2190         f->m_init_gdu = gdu;
2191
2192         mp::odr odr;
2193         Z_APDU *apdu = odr.create_initResponse(gdu->u.z3950, 0, 0);
2194         Z_InitResponse *resp = apdu->u.initResponse;
2195
2196         int i;
2197         static const int masks[] = {
2198             Z_Options_search,
2199             Z_Options_present,
2200             -1
2201         };
2202         for (i = 0; masks[i] != -1; i++)
2203             if (ODR_MASK_GET(req->options, masks[i]))
2204                 ODR_MASK_SET(resp->options, masks[i]);
2205
2206         static const int versions[] = {
2207             Z_ProtocolVersion_1,
2208             Z_ProtocolVersion_2,
2209             Z_ProtocolVersion_3,
2210             -1
2211         };
2212         for (i = 0; versions[i] != -1; i++)
2213             if (ODR_MASK_GET(req->protocolVersion, versions[i]))
2214                 ODR_MASK_SET(resp->protocolVersion, versions[i]);
2215             else
2216                 break;
2217
2218         *resp->preferredMessageSize = *req->preferredMessageSize;
2219         *resp->maximumRecordSize = *req->maximumRecordSize;
2220
2221         package.response() = apdu;
2222         f->m_is_virtual = true;
2223     }
2224     else
2225         package.move();
2226
2227     release_frontend(package);
2228 }
2229
2230
2231 static mp::filter::Base* filter_creator()
2232 {
2233     return new mp::filter::Zoom;
2234 }
2235
2236 extern "C" {
2237     struct metaproxy_1_filter_struct metaproxy_1_filter_zoom = {
2238         0,
2239         "zoom",
2240         filter_creator
2241     };
2242 }
2243
2244
2245 /*
2246  * Local variables:
2247  * c-basic-offset: 4
2248  * c-file-style: "Stroustrup"
2249  * indent-tabs-mode: nil
2250  * End:
2251  * vim: shiftwidth=4 tabstop=8 expandtab
2252  */
2253