src/session.c

   1 /* This file is part of Pazpar2.
   2    Copyright (C) 2006-2011 Index Data
   3
   4 Pazpar2 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 Pazpar2 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
  20 /** \file session.c
  21     \brief high-level logic; mostly user sessions and settings
  22 */
  23
  24 #if HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <time.h>
  29 #include <stdlib.h>
  30 #include <stdio.h>
  31 #include <string.h>
  32 #if HAVE_SYS_TIME_H
  33 #include <sys/time.h>
  34 #endif
  35 #if HAVE_UNISTD_H
  36 #include <unistd.h>
  37 #endif
  38 #ifdef WIN32
  39 #include <windows.h>
  40 #endif
  41 #include <signal.h>
  42 #include <ctype.h>
  43 #include <assert.h>
  44 #include <math.h>
  45
  46 #include <yaz/marcdisp.h>
  47 #include <yaz/comstack.h>
  48 #include <yaz/tcpip.h>
  49 #include <yaz/proto.h>
  50 #include <yaz/readconf.h>
  51 #include <yaz/pquery.h>
  52 #include <yaz/otherinfo.h>
  53 #include <yaz/yaz-util.h>
  54 #include <yaz/nmem.h>
  55 #include <yaz/query-charset.h>
  56 #include <yaz/querytowrbuf.h>
  57 #include <yaz/oid_db.h>
  58 #include <yaz/snprintf.h>
  59 #include <yaz/gettimeofday.h>
  60
  61 #define USE_TIMING 0
  62 #if USE_TIMING
  63 #include <yaz/timing.h>
  64 #endif
  65
  66 #include "ppmutex.h"
  67 #include "parameters.h"
  68 #include "session.h"
  69 #include "eventl.h"
  70 #include "http.h"
  71 #include "termlists.h"
  72 #include "reclists.h"
  73 #include "relevance.h"
  74 #include "database.h"
  75 #include "client.h"
  76 #include "settings.h"
  77 #include "normalize7bit.h"
  78
  79 #define TERMLIST_HIGH_SCORE 25
  80
  81 #define MAX_CHUNK 15
  82
  83 #define MAX(a,b) ((a)>(b)?(a):(b))
  84
  85 // Note: Some things in this structure will eventually move to configuration
  86 struct parameters global_parameters =
  87 {
  88     0,   // dump_records
  89     0,   // debug_mode
  90     0,   // predictable sessions
  91 };
  92
  93 struct client_list {
  94     struct client *client;
  95     struct client_list *next;
  96 };
  97
  98 struct session_sorted_results {
  99     const char *field;
 100     int increasing;
 101     struct session_sorted_results *next;
 102 };
 103
 104 /* session counting (1) , disable client counting (0) */
 105 static YAZ_MUTEX g_session_mutex = 0;
 106 static int no_sessions = 0;
 107 static int no_session_total = 0;
 108
 109 static int session_use(int delta)
 110 {
 111     int sessions;
 112     if (!g_session_mutex)
 113         yaz_mutex_create(&g_session_mutex);
 114     yaz_mutex_enter(g_session_mutex);
 115     no_sessions += delta;
 116     if (delta > 0)
 117         no_session_total += delta;
 118     sessions = no_sessions;
 119     yaz_mutex_leave(g_session_mutex);
 120     yaz_log(YLOG_DEBUG, "%s sessions=%d", delta == 0 ? "" : (delta > 0 ? "INC" : "DEC"), no_sessions);
 121     return sessions;
 122 }
 123
 124 int sessions_count(void)
 125 {
 126     return session_use(0);
 127 }
 128
 129 int session_count_total(void)
 130 {
 131     int total = 0;
 132     if (!g_session_mutex)
 133         return 0;
 134     yaz_mutex_enter(g_session_mutex);
 135     total = no_session_total;
 136     yaz_mutex_leave(g_session_mutex);
 137     return total;
 138 }
 139
 140 static void log_xml_doc(xmlDoc *doc)
 141 {
 142     FILE *lf = yaz_log_file();
 143     xmlChar *result = 0;
 144     int len = 0;
 145 #if LIBXML_VERSION >= 20600
 146     xmlDocDumpFormatMemory(doc, &result, &len, 1);
 147 #else
 148     xmlDocDumpMemory(doc, &result, &len);
 149 #endif
 150     if (lf && len)
 151     {
 152         (void) fwrite(result, 1, len, lf);
 153         fprintf(lf, "\n");
 154     }
 155     xmlFree(result);
 156 }
 157
 158 static void session_enter(struct session *s)
 159 {
 160     yaz_mutex_enter(s->session_mutex);
 161 }
 162
 163 static void session_leave(struct session *s)
 164 {
 165     yaz_mutex_leave(s->session_mutex);
 166 }
 167
 168 void add_facet(struct session *s, const char *type, const char *value, int count)
 169 {
 170     struct conf_service *service = s->service;
 171     pp2_charset_token_t prt;
 172     const char *facet_component;
 173     WRBUF facet_wrbuf = wrbuf_alloc();
 174     WRBUF display_wrbuf = wrbuf_alloc();
 175     int i;
 176     const char *icu_chain_id = 0;
 177
 178     for (i = 0; i < service->num_metadata; i++)
 179         if (!strcmp((service->metadata + i)->name, type))
 180             icu_chain_id = (service->metadata + i)->facetrule;
 181     if (!icu_chain_id)
 182         icu_chain_id = "facet";
 183     prt = pp2_charset_token_create(service->charsets, icu_chain_id);
 184     if (!prt)
 185     {
 186         yaz_log(YLOG_FATAL, "Unknown ICU chain '%s' for facet of type '%s'",
 187                 icu_chain_id, type);
 188         wrbuf_destroy(facet_wrbuf);
 189         wrbuf_destroy(display_wrbuf);
 190         return;
 191     }
 192     pp2_charset_token_first(prt, value, 0);
 193     while ((facet_component = pp2_charset_token_next(prt)))
 194     {
 195         const char *display_component;
 196         if (*facet_component)
 197         {
 198             if (wrbuf_len(facet_wrbuf))
 199                 wrbuf_puts(facet_wrbuf, " ");
 200             wrbuf_puts(facet_wrbuf, facet_component);
 201         }
 202         display_component = pp2_get_display(prt);
 203         if (display_component)
 204         {
 205             if (wrbuf_len(display_wrbuf))
 206                 wrbuf_puts(display_wrbuf, " ");
 207             wrbuf_puts(display_wrbuf, display_component);
 208         }
 209     }
 210     pp2_charset_token_destroy(prt);
 211
 212     if (wrbuf_len(facet_wrbuf))
 213     {
 214         int i;
 215         for (i = 0; i < s->num_termlists; i++)
 216             if (!strcmp(s->termlists[i].name, type))
 217                 break;
 218         if (i == s->num_termlists)
 219         {
 220             if (i == SESSION_MAX_TERMLISTS)
 221             {
 222                 session_log(s, YLOG_FATAL, "Too many termlists");
 223                 wrbuf_destroy(facet_wrbuf);
 224                 wrbuf_destroy(display_wrbuf);
 225                 return;
 226             }
 227
 228             s->termlists[i].name = nmem_strdup(s->nmem, type);
 229             s->termlists[i].termlist
 230                 = termlist_create(s->nmem, TERMLIST_HIGH_SCORE);
 231             s->num_termlists = i + 1;
 232         }
 233
 234 #if 0
 235         session_log(s, YLOG_DEBUG, "Facets for %s: %s norm:%s (%d)", type, value, wrbuf_cstr(facet_wrbuf), count);
 236 #endif
 237         termlist_insert(s->termlists[i].termlist, wrbuf_cstr(display_wrbuf),
 238                         wrbuf_cstr(facet_wrbuf), count);
 239     }
 240     wrbuf_destroy(facet_wrbuf);
 241     wrbuf_destroy(display_wrbuf);
 242 }
 243
 244 static xmlDoc *record_to_xml(struct session *se,
 245                              struct session_database *sdb, const char *rec)
 246 {
 247     struct database *db = sdb->database;
 248     xmlDoc *rdoc = 0;
 249
 250     rdoc = xmlParseMemory(rec, strlen(rec));
 251
 252     if (!rdoc)
 253     {
 254         session_log(se, YLOG_FATAL, "Non-wellformed XML received from %s",
 255                     db->id);
 256         return 0;
 257     }
 258
 259     if (global_parameters.dump_records)
 260     {
 261         session_log(se, YLOG_LOG, "Un-normalized record from %s", db->id);
 262         log_xml_doc(rdoc);
 263     }
 264
 265     return rdoc;
 266 }
 267
 268 #define MAX_XSLT_ARGS 16
 269
 270 // Add static values from session database settings if applicable
 271 static void insert_settings_parameters(struct session_database *sdb,
 272                                        struct conf_service *service,
 273                                        char **parms,
 274                                        NMEM nmem)
 275 {
 276     int i;
 277     int nparms = 0;
 278     int offset = 0;
 279
 280     for (i = 0; i < service->num_metadata; i++)
 281     {
 282         struct conf_metadata *md = &service->metadata[i];
 283         int setting;
 284
 285         if (md->setting == Metadata_setting_parameter &&
 286             (setting = settings_lookup_offset(service, md->name)) >= 0)
 287         {
 288             const char *val = session_setting_oneval(sdb, setting);
 289             if (val && nparms < MAX_XSLT_ARGS)
 290             {
 291                 char *buf;
 292                 int len = strlen(val);
 293                 buf = nmem_malloc(nmem, len + 3);
 294                 buf[0] = '\'';
 295                 strcpy(buf + 1, val);
 296                 buf[len+1] = '\'';
 297                 buf[len+2] = '\0';
 298                 parms[offset++] = md->name;
 299                 parms[offset++] = buf;
 300                 nparms++;
 301             }
 302         }
 303     }
 304     parms[offset] = 0;
 305 }
 306
 307 // Add static values from session database settings if applicable
 308 static void insert_settings_values(struct session_database *sdb, xmlDoc *doc,
 309     struct conf_service *service)
 310 {
 311     int i;
 312
 313     for (i = 0; i < service->num_metadata; i++)
 314     {
 315         struct conf_metadata *md = &service->metadata[i];
 316         int offset;
 317
 318         if (md->setting == Metadata_setting_postproc &&
 319             (offset = settings_lookup_offset(service, md->name)) >= 0)
 320         {
 321             const char *val = session_setting_oneval(sdb, offset);
 322             if (val)
 323             {
 324                 xmlNode *r = xmlDocGetRootElement(doc);
 325                 xmlNode *n = xmlNewTextChild(r, 0, (xmlChar *) "metadata",
 326                                              (xmlChar *) val);
 327                 xmlSetProp(n, (xmlChar *) "type", (xmlChar *) md->name);
 328             }
 329         }
 330     }
 331 }
 332
 333 static xmlDoc *normalize_record(struct session *se,
 334                                 struct session_database *sdb,
 335                                 struct conf_service *service,
 336                                 const char *rec, NMEM nmem)
 337 {
 338     xmlDoc *rdoc = record_to_xml(se, sdb, rec);
 339
 340     if (rdoc)
 341     {
 342         char *parms[MAX_XSLT_ARGS*2+1];
 343
 344         insert_settings_parameters(sdb, service, parms, nmem);
 345
 346         if (normalize_record_transform(sdb->map, &rdoc, (const char **)parms))
 347         {
 348             session_log(se, YLOG_WARN, "Normalize failed from %s",
 349                         sdb->database->id);
 350         }
 351         else
 352         {
 353             insert_settings_values(sdb, rdoc, service);
 354
 355             if (global_parameters.dump_records)
 356             {
 357                 session_log(se, YLOG_LOG, "Normalized record from %s",
 358                             sdb->database->id);
 359                 log_xml_doc(rdoc);
 360             }
 361         }
 362     }
 363     return rdoc;
 364 }
 365
 366 void session_settings_dump(struct session *se,
 367                            struct session_database *db,
 368                            WRBUF w)
 369 {
 370     if (db->settings)
 371     {
 372         int i, num = db->num_settings;
 373         for (i = 0; i < num; i++)
 374         {
 375             struct setting *s = db->settings[i];
 376             for (;s ; s = s->next)
 377             {
 378                 wrbuf_puts(w, "<set name=\"");
 379                 wrbuf_xmlputs(w, s->name);
 380                 wrbuf_puts(w, "\" value=\"");
 381                 wrbuf_xmlputs(w, s->value);
 382                 wrbuf_puts(w, "\"/>");
 383             }
 384             if (db->settings[i])
 385                 wrbuf_puts(w, "\n");
 386         }
 387     }
 388 }
 389
 390 // Retrieve first defined value for 'name' for given database.
 391 // Will be extended to take into account user associated with session
 392 const char *session_setting_oneval(struct session_database *db, int offset)
 393 {
 394     if (offset >= db->num_settings || !db->settings[offset])
 395         return "";
 396     return db->settings[offset]->value;
 397 }
 398
 399 // Prepare XSLT stylesheets for record normalization
 400 // Structures are allocated on the session_wide nmem to avoid having
 401 // to recompute this for every search. This would lead
 402 // to leaking if a single session was to repeatedly change the PZ_XSLT
 403 // setting. However, this is not a realistic use scenario.
 404 static int prepare_map(struct session *se, struct session_database *sdb)
 405 {
 406     const char *s;
 407
 408     if (sdb->settings && sdb->settings[PZ_XSLT] && !sdb->map &&
 409         (s = session_setting_oneval(sdb, PZ_XSLT)))
 410     {
 411         char auto_stylesheet[256];
 412
 413         if (!strcmp(s, "auto"))
 414         {
 415             const char *request_syntax = session_setting_oneval(
 416                 sdb, PZ_REQUESTSYNTAX);
 417             if (request_syntax)
 418             {
 419                 char *cp;
 420                 yaz_snprintf(auto_stylesheet, sizeof(auto_stylesheet),
 421                              "%s.xsl", request_syntax);
 422                 for (cp = auto_stylesheet; *cp; cp++)
 423                 {
 424                     /* deliberately only consider ASCII */
 425                     if (*cp > 32 && *cp < 127)
 426                         *cp = tolower(*cp);
 427                 }
 428                 s = auto_stylesheet;
 429             }
 430             else
 431             {
 432                 session_log(se, YLOG_WARN,
 433                             "No pz:requestsyntax for auto stylesheet");
 434             }
 435         }
 436         sdb->map = normalize_cache_get(se->normalize_cache,
 437                                        se->service, s);
 438         if (!sdb->map)
 439             return -1;
 440     }
 441     return 0;
 442 }
 443
 444 // called if watch should be removed because http_channel is to be destroyed
 445 static void session_watch_cancel(void *data, struct http_channel *c,
 446                                  void *data2)
 447 {
 448     struct session_watchentry *ent = data;
 449
 450     ent->fun = 0;
 451     ent->data = 0;
 452     ent->obs = 0;
 453 }
 454
 455 // set watch. Returns 0=OK, -1 if watch is already set
 456 int session_set_watch(struct session *s, int what,
 457                       session_watchfun fun, void *data,
 458                       struct http_channel *chan)
 459 {
 460     int ret;
 461     session_enter(s);
 462     if (s->watchlist[what].fun)
 463         ret = -1;
 464     else
 465     {
 466
 467         s->watchlist[what].fun = fun;
 468         s->watchlist[what].data = data;
 469         s->watchlist[what].obs = http_add_observer(chan, &s->watchlist[what],
 470                                                    session_watch_cancel);
 471         ret = 0;
 472     }
 473     session_leave(s);
 474     return ret;
 475 }
 476
 477 void session_alert_watch(struct session *s, int what)
 478 {
 479     assert(s);
 480     session_enter(s);
 481     if (s->watchlist[what].fun)
 482     {
 483         /* our watch is no longer associated with http_channel */
 484         void *data;
 485         session_watchfun fun;
 486
 487         http_remove_observer(s->watchlist[what].obs);
 488         fun  = s->watchlist[what].fun;
 489         data = s->watchlist[what].data;
 490
 491         /* reset watch before fun is invoked - in case fun wants to set
 492            it again */
 493         s->watchlist[what].fun = 0;
 494         s->watchlist[what].data = 0;
 495         s->watchlist[what].obs = 0;
 496
 497         session_leave(s);
 498         session_log(s, YLOG_DEBUG,
 499                     "Alert Watch: %d calling function: %p", what, fun);
 500         fun(data);
 501     }
 502     else
 503         session_leave(s);
 504 }
 505
 506 //callback for grep_databases
 507 static void select_targets_callback(struct session *se,
 508                                     struct session_database *db)
 509 {
 510     struct client *cl;
 511     struct client_list *l;
 512
 513     for (l = se->clients_cached; l; l = l->next)
 514         if (client_get_database(l->client) == db)
 515             break;
 516
 517     if (l)
 518         cl = l->client;
 519     else
 520     {
 521         cl = client_create(db->database->id);
 522         client_set_database(cl, db);
 523         client_set_session(cl, se);
 524
 525         l = xmalloc(sizeof(*l));
 526         l->client = cl;
 527         l->next = se->clients_cached;
 528         se->clients_cached = l;
 529     }
 530
 531     l = xmalloc(sizeof(*l));
 532     l->client = cl;
 533     l->next = se->clients;
 534     se->clients = l;
 535 }
 536
 537 static void session_remove_clients(struct session *se)
 538 {
 539     struct client_list *l;
 540
 541     session_enter(se);
 542     l = se->clients;
 543     se->clients = 0;
 544     session_leave(se);
 545
 546     while (l)
 547     {
 548         struct client_list *l_next = l->next;
 549         xfree(l);
 550         l = l_next;
 551     }
 552 }
 553
 554 static void session_remove_cached_clients(struct session *se)
 555 {
 556     struct client_list *l;
 557
 558     session_remove_clients(se);
 559
 560     session_enter(se);
 561     l = se->clients_cached;
 562     se->clients_cached = 0;
 563     session_leave(se);
 564
 565     while (l)
 566     {
 567         struct client_list *l_next = l->next;
 568         client_lock(l->client);
 569         client_set_session(l->client, 0);
 570         client_set_database(l->client, 0);
 571         client_unlock(l->client);
 572         client_destroy(l->client);
 573         xfree(l);
 574         l = l_next;
 575     }
 576 }
 577
 578 // Associates a set of clients with a session;
 579 // Note: Session-databases represent databases with per-session
 580 // setting overrides
 581 static int select_targets(struct session *se, const char *filter)
 582 {
 583     return session_grep_databases(se, filter, select_targets_callback);
 584 }
 585
 586 int session_active_clients(struct session *s)
 587 {
 588     struct client_list *l;
 589     int res = 0;
 590
 591     for (l = s->clients; l; l = l->next)
 592         if (client_is_active(l->client))
 593             res++;
 594
 595     return res;
 596 }
 597
 598 int session_is_preferred_clients_ready(struct session *s)
 599 {
 600     struct client_list *l;
 601     int res = 0;
 602
 603     for (l = s->clients; l; l = l->next)
 604         if (client_is_active_preferred(l->client))
 605             res++;
 606     session_log(s, YLOG_DEBUG, "Has %d active preferred clients.", res);
 607     return res == 0;
 608 }
 609
 610 static const char *get_strategy_plus_sort(struct client *l, const char *field)
 611 {
 612     struct session_database *sdb = client_get_database(l);
 613     struct setting *s;
 614
 615     const char *strategy_plus_sort = 0;
 616
 617     for (s = sdb->settings[PZ_SORTMAP]; s; s = s->next)
 618     {
 619         char *p = strchr(s->name + 3, ':');
 620         if (!p)
 621         {
 622             yaz_log(YLOG_WARN, "Malformed sortmap name: %s", s->name);
 623             continue;
 624         }
 625         p++;
 626         if (!strcmp(p, field))
 627         {
 628             strategy_plus_sort = s->value;
 629             break;
 630         }
 631     }
 632     return strategy_plus_sort;
 633 }
 634
 635 void session_sort(struct session *se, const char *field, int increasing)
 636 {
 637     struct session_sorted_results *sr;
 638     struct client_list *l;
 639
 640     session_enter(se);
 641
 642     /* see if we already have sorted for this critieria */
 643     for (sr = se->sorted_results; sr; sr = sr->next)
 644     {
 645         if (!strcmp(field, sr->field) && increasing == sr->increasing)
 646             break;
 647     }
 648     if (sr)
 649     {
 650         yaz_log(YLOG_LOG, "search_sort: field=%s increasing=%d already fetched",
 651                 field, increasing);
 652         session_leave(se);
 653         return;
 654     }
 655     yaz_log(YLOG_LOG, "search_sort: field=%s increasing=%d must fetch",
 656             field, increasing);
 657     sr = nmem_malloc(se->nmem, sizeof(*sr));
 658     sr->field = nmem_strdup(se->nmem, field);
 659     sr->increasing = increasing;
 660     sr->next = se->sorted_results;
 661     se->sorted_results = sr;
 662
 663     for (l = se->clients; l; l = l->next)
 664     {
 665         struct client *cl = l->client;
 666         const char *strategy_plus_sort = get_strategy_plus_sort(cl, field);
 667         if (strategy_plus_sort)
 668         {
 669             struct timeval tval;
 670             if (client_prep_connection(cl, se->service->z3950_operation_timeout,
 671                                        se->service->z3950_session_timeout,
 672                                        se->service->server->iochan_man,
 673                                        &tval))
 674                 client_start_search(cl, strategy_plus_sort, increasing);
 675         }
 676     }
 677     session_leave(se);
 678 }
 679
 680 enum pazpar2_error_code session_search(struct session *se,
 681                                        const char *query,
 682                                        const char *startrecs,
 683                                        const char *maxrecs,
 684                                        const char *filter,
 685                                        const char *limit,
 686                                        const char **addinfo,
 687                                        const char *sort_field, int increasing)
 688 {
 689     int live_channels = 0;
 690     int no_working = 0;
 691     int no_failed = 0;
 692     struct client_list *l;
 693     struct timeval tval;
 694     facet_limits_t facet_limits;
 695
 696     session_log(se, YLOG_DEBUG, "Search");
 697
 698     *addinfo = 0;
 699
 700     if (se->settings_modified)
 701         session_remove_cached_clients(se);
 702     else
 703         session_remove_clients(se);
 704
 705     session_enter(se);
 706     reclist_destroy(se->reclist);
 707     se->reclist = 0;
 708     se->settings_modified = 0;
 709     relevance_destroy(&se->relevance);
 710     nmem_reset(se->nmem);
 711     se->total_records = se->total_merged = 0;
 712     se->num_termlists = 0;
 713
 714     /* reset list of sorted results and clear to relevance search */
 715     se->sorted_results = nmem_malloc(se->nmem, sizeof(*se->sorted_results));
 716     se->sorted_results->field = nmem_strdup(se->nmem, sort_field);
 717     se->sorted_results->increasing = increasing;
 718     se->sorted_results->next = 0;
 719
 720     live_channels = select_targets(se, filter);
 721     if (!live_channels)
 722     {
 723         session_leave(se);
 724         return PAZPAR2_NO_TARGETS;
 725     }
 726     se->reclist = reclist_create(se->nmem);
 727
 728     yaz_gettimeofday(&tval);
 729
 730     tval.tv_sec += 5;
 731
 732     facet_limits = facet_limits_create(limit);
 733     if (!facet_limits)
 734     {
 735         *addinfo = "limit";
 736         session_leave(se);
 737         return PAZPAR2_MALFORMED_PARAMETER_VALUE;
 738     }
 739     for (l = se->clients; l; l = l->next)
 740     {
 741         int parse_ret;
 742         struct client *cl = l->client;
 743         const char *strategy_plus_sort = get_strategy_plus_sort(cl, sort_field);
 744
 745         if (prepare_map(se, client_get_database(cl)) < 0)
 746             continue;
 747
 748         parse_ret = client_parse_query(cl, query, facet_limits, startrecs,
 749             maxrecs);
 750         if (parse_ret < 0)
 751             no_failed++;
 752         else if (parse_ret == 0)
 753         {
 754             session_log(se, YLOG_LOG, "client NEW %s", client_get_id(cl));
 755             no_working++;
 756             if (client_prep_connection(cl, se->service->z3950_operation_timeout,
 757                                        se->service->z3950_session_timeout,
 758                                        se->service->server->iochan_man,
 759                                        &tval))
 760                 client_start_search(cl, strategy_plus_sort, increasing);
 761         }
 762         else
 763         {
 764             session_log(se, YLOG_LOG, "client REUSE %s", client_get_id(cl));
 765             no_working++;
 766             if (client_prep_connection(cl, se->service->z3950_operation_timeout,
 767                                        se->service->z3950_session_timeout,
 768                                        se->service->server->iochan_man,
 769                                        &tval))
 770             {
 771                 session_leave(se);
 772                 client_reingest(cl);
 773                 session_enter(se);
 774             }
 775         }
 776     }
 777     facet_limits_destroy(facet_limits);
 778     session_leave(se);
 779     if (no_working == 0)
 780     {
 781         if (no_failed > 0)
 782         {
 783             *addinfo = "query";
 784             return PAZPAR2_MALFORMED_PARAMETER_VALUE;
 785         }
 786         else
 787             return PAZPAR2_NO_TARGETS;
 788     }
 789     yaz_log(YLOG_LOG, "session_start_search done");
 790     return PAZPAR2_NO_ERROR;
 791 }
 792
 793 // Creates a new session_database object for a database
 794 static void session_init_databases_fun(void *context, struct database *db)
 795 {
 796     struct session *se = (struct session *) context;
 797     struct session_database *new = nmem_malloc(se->session_nmem, sizeof(*new));
 798     int i;
 799
 800     new->database = db;
 801
 802     new->map = 0;
 803     assert(db->settings);
 804     new->settings = nmem_malloc(se->session_nmem,
 805                                 sizeof(struct settings *) * db->num_settings);
 806     new->num_settings = db->num_settings;
 807     for (i = 0; i < db->num_settings; i++)
 808     {
 809         struct setting *setting = db->settings[i];
 810         new->settings[i] = setting;
 811     }
 812     new->next = se->databases;
 813     se->databases = new;
 814 }
 815
 816 // Doesn't free memory associated with sdb -- nmem takes care of that
 817 static void session_database_destroy(struct session_database *sdb)
 818 {
 819     sdb->map = 0;
 820 }
 821
 822 // Initialize session_database list -- this represents this session's view
 823 // of the database list -- subject to modification by the settings ws command
 824 void session_init_databases(struct session *se)
 825 {
 826     se->databases = 0;
 827     predef_grep_databases(se, se->service, session_init_databases_fun);
 828 }
 829
 830 // Probably session_init_databases_fun should be refactored instead of
 831 // called here.
 832 static struct session_database *load_session_database(struct session *se,
 833                                                       char *id)
 834 {
 835     struct database *db = new_database(id, se->session_nmem);
 836
 837     session_init_databases_fun((void*) se, db);
 838
 839     // New sdb is head of se->databases list
 840     return se->databases;
 841 }
 842
 843 // Find an existing session database. If not found, load it
 844 static struct session_database *find_session_database(struct session *se,
 845                                                       char *id)
 846 {
 847     struct session_database *sdb;
 848
 849     for (sdb = se->databases; sdb; sdb = sdb->next)
 850         if (!strcmp(sdb->database->id, id))
 851             return sdb;
 852     return load_session_database(se, id);
 853 }
 854
 855 // Apply a session override to a database
 856 void session_apply_setting(struct session *se, char *dbname, char *setting,
 857                            char *value)
 858 {
 859     struct session_database *sdb = find_session_database(se, dbname);
 860     struct conf_service *service = se->service;
 861     struct setting *new = nmem_malloc(se->session_nmem, sizeof(*new));
 862     int offset = settings_create_offset(service, setting);
 863
 864     expand_settings_array(&sdb->settings, &sdb->num_settings, offset,
 865                           se->session_nmem);
 866     new->precedence = 0;
 867     new->target = dbname;
 868     new->name = setting;
 869     new->value = value;
 870     new->next = sdb->settings[offset];
 871     sdb->settings[offset] = new;
 872
 873     se->settings_modified = 1;
 874
 875     // Force later recompute of settings-driven data structures
 876     // (happens when a search starts and client connections are prepared)
 877     switch (offset)
 878     {
 879     case PZ_XSLT:
 880         if (sdb->map)
 881         {
 882             sdb->map = 0;
 883         }
 884         break;
 885     }
 886 }
 887
 888 void session_destroy(struct session *se)
 889 {
 890     struct session_database *sdb;
 891     session_log(se, YLOG_DEBUG, "Destroying");
 892     session_use(-1);
 893     session_remove_cached_clients(se);
 894
 895     for (sdb = se->databases; sdb; sdb = sdb->next)
 896         session_database_destroy(sdb);
 897     normalize_cache_destroy(se->normalize_cache);
 898     relevance_destroy(&se->relevance);
 899     reclist_destroy(se->reclist);
 900     nmem_destroy(se->nmem);
 901     service_destroy(se->service);
 902     yaz_mutex_destroy(&se->session_mutex);
 903 }
 904
 905 size_t session_get_memory_status(struct session *session) {
 906     size_t session_nmem;
 907     if (session == 0)
 908         return 0;
 909     session_enter(session);
 910     session_nmem = nmem_total(session->nmem);
 911     session_leave(session);
 912     return session_nmem;
 913 }
 914
 915
 916 struct session *new_session(NMEM nmem, struct conf_service *service,
 917                             unsigned session_id)
 918 {
 919     int i;
 920     struct session *session = nmem_malloc(nmem, sizeof(*session));
 921
 922     char tmp_str[50];
 923
 924     sprintf(tmp_str, "session#%u", session_id);
 925
 926     session->session_id = session_id;
 927     session_log(session, YLOG_DEBUG, "New");
 928     session->service = service;
 929     session->relevance = 0;
 930     session->total_records = 0;
 931     session->number_of_warnings_unknown_elements = 0;
 932     session->number_of_warnings_unknown_metadata = 0;
 933     session->num_termlists = 0;
 934     session->reclist = 0;
 935     session->clients = 0;
 936     session->clients_cached = 0;
 937     session->settings_modified = 0;
 938     session->session_nmem = nmem;
 939     session->nmem = nmem_create();
 940     session->databases = 0;
 941     for (i = 0; i <= SESSION_WATCH_MAX; i++)
 942     {
 943         session->watchlist[i].data = 0;
 944         session->watchlist[i].fun = 0;
 945     }
 946     session->normalize_cache = normalize_cache_create();
 947     session->session_mutex = 0;
 948     pazpar2_mutex_create(&session->session_mutex, tmp_str);
 949     session_use(1);
 950     return session;
 951 }
 952
 953 const char * client_get_suggestions_xml(struct client *cl, WRBUF wrbuf);
 954
 955 static struct hitsbytarget *hitsbytarget_nb(struct session *se,
 956                                             int *count, NMEM nmem)
 957 {
 958     struct hitsbytarget *res = 0;
 959     struct client_list *l;
 960     size_t sz = 0;
 961
 962     for (l = se->clients; l; l = l->next)
 963         sz++;
 964
 965     res = nmem_malloc(nmem, sizeof(*res) * sz);
 966     *count = 0;
 967     for (l = se->clients; l; l = l->next)
 968     {
 969         struct client *cl = l->client;
 970         WRBUF w = wrbuf_alloc();
 971         const char *name = session_setting_oneval(client_get_database(cl),
 972                                                   PZ_NAME);
 973
 974         res[*count].id = client_get_id(cl);
 975         res[*count].name = *name ? name : "Unknown";
 976         res[*count].hits = client_get_hits(cl);
 977         res[*count].records = client_get_num_records(cl);
 978         res[*count].diagnostic = client_get_diagnostic(cl);
 979         res[*count].state = client_get_state_str(cl);
 980         res[*count].connected  = client_get_connection(cl) ? 1 : 0;
 981         session_settings_dump(se, client_get_database(cl), w);
 982         res[*count].settings_xml = nmem_strdup(nmem, wrbuf_cstr(w));
 983         wrbuf_rewind(w);
 984         wrbuf_puts(w, "");
 985         res[*count].suggestions_xml = nmem_strdup(nmem, client_get_suggestions_xml(cl, w));
 986         wrbuf_destroy(w);
 987         (*count)++;
 988     }
 989     return res;
 990 }
 991
 992 struct hitsbytarget *get_hitsbytarget(struct session *se, int *count, NMEM nmem)
 993 {
 994     struct hitsbytarget *p;
 995     session_enter(se);
 996     p = hitsbytarget_nb(se, count, nmem);
 997     session_leave(se);
 998     return p;
 999 }
1000
1001 struct termlist_score **get_termlist_score(struct session *se,
1002                                            const char *name, int *num)
1003 {
1004     int i;
1005     struct termlist_score **tl = 0;
1006
1007     session_enter(se);
1008     for (i = 0; i < se->num_termlists; i++)
1009         if (!strcmp((const char *) se->termlists[i].name, name))
1010         {
1011             tl = termlist_highscore(se->termlists[i].termlist, num);
1012             break;
1013         }
1014     session_leave(se);
1015     return tl;
1016 }
1017
1018 // Compares two hitsbytarget nodes by hitcount
1019 static int cmp_ht(const void *p1, const void *p2)
1020 {
1021     const struct hitsbytarget *h1 = p1;
1022     const struct hitsbytarget *h2 = p2;
1023     return h2->hits - h1->hits;
1024 }
1025
1026 static int targets_termlist_nb(WRBUF wrbuf, struct session *se, int num,
1027                                NMEM nmem)
1028 {
1029     struct hitsbytarget *ht;
1030     int count, i;
1031
1032     ht = hitsbytarget_nb(se, &count, nmem);
1033     qsort(ht, count, sizeof(struct hitsbytarget), cmp_ht);
1034     for (i = 0; i < count && i < num && ht[i].hits > 0; i++)
1035     {
1036
1037         // do only print terms which have display names
1038
1039         wrbuf_puts(wrbuf, "<term>\n");
1040
1041         wrbuf_puts(wrbuf, "<id>");
1042         wrbuf_xmlputs(wrbuf, ht[i].id);
1043         wrbuf_puts(wrbuf, "</id>\n");
1044
1045         wrbuf_puts(wrbuf, "<name>");
1046         if (!ht[i].name || !ht[i].name[0])
1047             wrbuf_xmlputs(wrbuf, "NO TARGET NAME");
1048         else
1049             wrbuf_xmlputs(wrbuf, ht[i].name);
1050         wrbuf_puts(wrbuf, "</name>\n");
1051
1052         wrbuf_printf(wrbuf, "<frequency>" ODR_INT_PRINTF "</frequency>\n",
1053                      ht[i].hits);
1054
1055         wrbuf_puts(wrbuf, "<state>");
1056         wrbuf_xmlputs(wrbuf, ht[i].state);
1057         wrbuf_puts(wrbuf, "</state>\n");
1058
1059         wrbuf_printf(wrbuf, "<diagnostic>%d</diagnostic>\n",
1060                      ht[i].diagnostic);
1061         wrbuf_puts(wrbuf, "</term>\n");
1062     }
1063     return count;
1064 }
1065
1066 void perform_termlist(struct http_channel *c, struct session *se,
1067                       const char *name, int num)
1068 {
1069     int i, j;
1070     NMEM nmem_tmp = nmem_create();
1071     char **names;
1072     int num_names = 0;
1073
1074     if (name)
1075         nmem_strsplit(nmem_tmp, ",", name, &names, &num_names);
1076
1077     session_enter(se);
1078
1079     for (j = 0; j < num_names; j++)
1080     {
1081         const char *tname;
1082
1083         wrbuf_puts(c->wrbuf, "<list name=\"");
1084         wrbuf_xmlputs(c->wrbuf, names[j]);
1085         wrbuf_puts(c->wrbuf, "\">\n");
1086
1087         for (i = 0; i < se->num_termlists; i++)
1088         {
1089             tname = se->termlists[i].name;
1090             if (num_names > 0 && !strcmp(names[j], tname))
1091             {
1092                 struct termlist_score **p = 0;
1093                 int len;
1094                 p = termlist_highscore(se->termlists[i].termlist, &len);
1095                 if (p)
1096                 {
1097                     int i;
1098                     for (i = 0; i < len && i < num; i++)
1099                     {
1100                         // prevent sending empty term elements
1101                         if (!p[i]->display_term || !p[i]->display_term[0])
1102                             continue;
1103
1104                         wrbuf_puts(c->wrbuf, "<term>");
1105                         wrbuf_puts(c->wrbuf, "<name>");
1106                         wrbuf_xmlputs(c->wrbuf, p[i]->display_term);
1107                         wrbuf_puts(c->wrbuf, "</name>");
1108
1109                         wrbuf_printf(c->wrbuf,
1110                                      "<frequency>%d</frequency>",
1111                                      p[i]->frequency);
1112                         wrbuf_puts(c->wrbuf, "</term>\n");
1113                     }
1114                 }
1115             }
1116         }
1117         tname = "xtargets";
1118         if (num_names > 0 && !strcmp(names[j], tname))
1119         {
1120             targets_termlist_nb(c->wrbuf, se, num, c->nmem);
1121         }
1122         wrbuf_puts(c->wrbuf, "</list>\n");
1123     }
1124     session_leave(se);
1125     nmem_destroy(nmem_tmp);
1126 }
1127
1128 #ifdef MISSING_HEADERS
1129 void report_nmem_stats(void)
1130 {
1131     size_t in_use, is_free;
1132
1133     nmem_get_memory_in_use(&in_use);
1134     nmem_get_memory_free(&is_free);
1135
1136     yaz_log(YLOG_LOG, "nmem stat: use=%ld free=%ld",
1137             (long) in_use, (long) is_free);
1138 }
1139 #endif
1140
1141 struct record_cluster *show_single_start(struct session *se, const char *id,
1142                                          struct record_cluster **prev_r,
1143                                          struct record_cluster **next_r)
1144 {
1145     struct record_cluster *r = 0;
1146
1147     session_enter(se);
1148     *prev_r = 0;
1149     *next_r = 0;
1150     if (se->reclist)
1151     {
1152         reclist_enter(se->reclist);
1153         while ((r = reclist_read_record(se->reclist)))
1154         {
1155             if (!strcmp(r->recid, id))
1156             {
1157                 *next_r = reclist_read_record(se->reclist);
1158                 break;
1159             }
1160             *prev_r = r;
1161         }
1162         reclist_leave(se->reclist);
1163     }
1164     if (!r)
1165         session_leave(se);
1166     return r;
1167 }
1168
1169 void show_single_stop(struct session *se, struct record_cluster *rec)
1170 {
1171     session_leave(se);
1172 }
1173
1174 struct record_cluster **show_range_start(struct session *se,
1175                                          struct reclist_sortparms *sp,
1176                                          int start, int *num, int *total, Odr_int *sumhits)
1177 {
1178     struct record_cluster **recs;
1179     struct reclist_sortparms *spp;
1180     int i;
1181 #if USE_TIMING
1182     yaz_timing_t t = yaz_timing_create();
1183 #endif
1184     session_enter(se);
1185     recs = nmem_malloc(se->nmem, *num * sizeof(struct record_cluster *));
1186     if (!se->relevance)
1187     {
1188         *num = 0;
1189         *total = 0;
1190         *sumhits = 0;
1191         recs = 0;
1192     }
1193     else
1194     {
1195         struct client_list *l;
1196
1197         for (spp = sp; spp; spp = spp->next)
1198             if (spp->type == Metadata_sortkey_relevance)
1199             {
1200                 relevance_prepare_read(se->relevance, se->reclist);
1201                 break;
1202             }
1203         reclist_sort(se->reclist, sp);
1204
1205         reclist_enter(se->reclist);
1206         *total = reclist_get_num_records(se->reclist);
1207
1208         *sumhits = 0;
1209         for (l = se->clients; l; l = l->next)
1210             *sumhits += client_get_hits(l->client);
1211
1212         for (i = 0; i < start; i++)
1213             if (!reclist_read_record(se->reclist))
1214             {
1215                 *num = 0;
1216                 recs = 0;
1217                 break;
1218             }
1219
1220         for (i = 0; i < *num; i++)
1221         {
1222             struct record_cluster *r = reclist_read_record(se->reclist);
1223             if (!r)
1224             {
1225                 *num = i;
1226                 break;
1227             }
1228             recs[i] = r;
1229         }
1230         reclist_leave(se->reclist);
1231     }
1232 #if USE_TIMING
1233     yaz_timing_stop(t);
1234     yaz_log(YLOG_LOG, "show %6.5f %3.2f %3.2f",
1235             yaz_timing_get_real(t), yaz_timing_get_user(t),
1236             yaz_timing_get_sys(t));
1237     yaz_timing_destroy(&t);
1238 #endif
1239     return recs;
1240 }
1241
1242 void show_range_stop(struct session *se, struct record_cluster **recs)
1243 {
1244     session_leave(se);
1245 }
1246
1247 void statistics(struct session *se, struct statistics *stat)
1248 {
1249     struct client_list *l;
1250     int count = 0;
1251
1252     memset(stat, 0, sizeof(*stat));
1253     stat->num_hits = 0;
1254     for (l = se->clients; l; l = l->next)
1255     {
1256         struct client *cl = l->client;
1257         if (!client_get_connection(cl))
1258             stat->num_no_connection++;
1259         stat->num_hits += client_get_hits(cl);
1260         switch (client_get_state(cl))
1261         {
1262         case Client_Connecting: stat->num_connecting++; break;
1263         case Client_Working: stat->num_working++; break;
1264         case Client_Idle: stat->num_idle++; break;
1265         case Client_Failed: stat->num_failed++; break;
1266         case Client_Error: stat->num_error++; break;
1267         default: break;
1268         }
1269         count++;
1270     }
1271     stat->num_records = se->total_records;
1272
1273     stat->num_clients = count;
1274 }
1275
1276 static struct record_metadata *record_metadata_init(
1277     NMEM nmem, const char *value, enum conf_metadata_type type,
1278     struct _xmlAttr *attr)
1279 {
1280     struct record_metadata *rec_md = record_metadata_create(nmem);
1281     struct record_metadata_attr **attrp = &rec_md->attributes;
1282
1283     for (; attr; attr = attr->next)
1284     {
1285         if (attr->children && attr->children->content)
1286         {
1287             if (strcmp((const char *) attr->name, "type"))
1288             {  /* skip the "type" attribute.. Its value is already part of
1289                   the element in output (md-%s) and so repeating it here
1290                   is redundant */
1291                 *attrp = nmem_malloc(nmem, sizeof(**attrp));
1292                 (*attrp)->name =
1293                     nmem_strdup(nmem, (const char *) attr->name);
1294                 (*attrp)->value =
1295                     nmem_strdup(nmem, (const char *) attr->children->content);
1296                 attrp = &(*attrp)->next;
1297             }
1298         }
1299     }
1300     *attrp = 0;
1301
1302     if (type == Metadata_type_generic)
1303     {
1304         char *p = nmem_strdup(nmem, value);
1305
1306         p = normalize7bit_generic(p, " ,/.:([");
1307
1308         rec_md->data.text.disp = p;
1309         rec_md->data.text.sort = 0;
1310     }
1311     else if (type == Metadata_type_year || type == Metadata_type_date)
1312     {
1313         int first, last;
1314         int longdate = 0;
1315
1316         if (type == Metadata_type_date)
1317             longdate = 1;
1318         if (extract7bit_dates((char *) value, &first, &last, longdate) < 0)
1319             return 0;
1320
1321         rec_md->data.number.min = first;
1322         rec_md->data.number.max = last;
1323     }
1324     else
1325         return 0;
1326     return rec_md;
1327 }
1328
1329 static int get_mergekey_from_doc(xmlDoc *doc, xmlNode *root, const char *name,
1330                                  struct conf_service *service, WRBUF norm_wr)
1331 {
1332     xmlNode *n;
1333     int no_found = 0;
1334     for (n = root->children; n; n = n->next)
1335     {
1336         if (n->type != XML_ELEMENT_NODE)
1337             continue;
1338         if (!strcmp((const char *) n->name, "metadata"))
1339         {
1340             xmlChar *type = xmlGetProp(n, (xmlChar *) "type");
1341             if (type == NULL) {
1342                 yaz_log(YLOG_FATAL, "Missing type attribute on metadata element. Skipping!");
1343             }
1344             else if (!strcmp(name, (const char *) type))
1345             {
1346                 xmlChar *value = xmlNodeListGetString(doc, n->children, 1);
1347                 if (value)
1348                 {
1349                     const char *norm_str;
1350                     pp2_charset_token_t prt =
1351                         pp2_charset_token_create(service->charsets, "mergekey");
1352
1353                     pp2_charset_token_first(prt, (const char *) value, 0);
1354                     if (wrbuf_len(norm_wr) > 0)
1355                         wrbuf_puts(norm_wr, " ");
1356                     wrbuf_puts(norm_wr, name);
1357                     while ((norm_str =
1358                             pp2_charset_token_next(prt)))
1359                     {
1360                         if (*norm_str)
1361                         {
1362                             wrbuf_puts(norm_wr, " ");
1363                             wrbuf_puts(norm_wr, norm_str);
1364                         }
1365                     }
1366                     xmlFree(value);
1367                     pp2_charset_token_destroy(prt);
1368                     no_found++;
1369                 }
1370             }
1371             xmlFree(type);
1372         }
1373     }
1374     return no_found;
1375 }
1376
1377 static const char *get_mergekey(xmlDoc *doc, struct client *cl, int record_no,
1378                                 struct conf_service *service, NMEM nmem)
1379 {
1380     char *mergekey_norm = 0;
1381     xmlNode *root = xmlDocGetRootElement(doc);
1382     WRBUF norm_wr = wrbuf_alloc();
1383
1384     /* consider mergekey from XSL first */
1385     xmlChar *mergekey = xmlGetProp(root, (xmlChar *) "mergekey");
1386     if (mergekey)
1387     {
1388         const char *norm_str;
1389         pp2_charset_token_t prt =
1390             pp2_charset_token_create(service->charsets, "mergekey");
1391
1392         pp2_charset_token_first(prt, (const char *) mergekey, 0);
1393         while ((norm_str = pp2_charset_token_next(prt)))
1394         {
1395             if (*norm_str)
1396             {
1397                 if (wrbuf_len(norm_wr))
1398                     wrbuf_puts(norm_wr, " ");
1399                 wrbuf_puts(norm_wr, norm_str);
1400             }
1401         }
1402         pp2_charset_token_destroy(prt);
1403         xmlFree(mergekey);
1404     }
1405     else
1406     {
1407         /* no mergekey defined in XSL. Look for mergekey metadata instead */
1408         int field_id;
1409         for (field_id = 0; field_id < service->num_metadata; field_id++)
1410         {
1411             struct conf_metadata *ser_md = &service->metadata[field_id];
1412             if (ser_md->mergekey != Metadata_mergekey_no)
1413             {
1414                 int r = get_mergekey_from_doc(doc, root, ser_md->name,
1415                                               service, norm_wr);
1416                 if (r == 0 && ser_md->mergekey == Metadata_mergekey_required)
1417                 {
1418                     /* no mergekey on this one and it is required..
1419                        Generate unique key instead */
1420                     wrbuf_rewind(norm_wr);
1421                     break;
1422                 }
1423             }
1424         }
1425     }
1426
1427     /* generate unique key if none is not generated already or is empty */
1428     if (wrbuf_len(norm_wr) == 0)
1429     {
1430         wrbuf_printf(norm_wr, "position: %s-%d",
1431                      client_get_id(cl), record_no);
1432     }
1433     else
1434     {
1435         const char *lead = "content: ";
1436         wrbuf_insert(norm_wr, 0, lead, strlen(lead));
1437     }
1438     if (wrbuf_len(norm_wr) > 0)
1439         mergekey_norm = nmem_strdup(nmem, wrbuf_cstr(norm_wr));
1440     wrbuf_destroy(norm_wr);
1441     return mergekey_norm;
1442 }
1443
1444 /** \brief see if metadata for pz:recordfilter exists
1445     \param root xml root element of normalized record
1446     \param sdb session database for client
1447     \retval 0 if there is no metadata for pz:recordfilter
1448     \retval 1 if there is metadata for pz:recordfilter
1449
1450     If there is no pz:recordfilter defined, this function returns 1
1451     as well.
1452 */
1453
1454 static int check_record_filter(xmlNode *root, struct session_database *sdb)
1455 {
1456     int match = 0;
1457     xmlNode *n;
1458     const char *s;
1459     s = session_setting_oneval(sdb, PZ_RECORDFILTER);
1460
1461     if (!s || !*s)
1462         return 1;
1463
1464     for (n = root->children; n; n = n->next)
1465     {
1466         if (n->type != XML_ELEMENT_NODE)
1467             continue;
1468         if (!strcmp((const char *) n->name, "metadata"))
1469         {
1470             xmlChar *type = xmlGetProp(n, (xmlChar *) "type");
1471             if (type)
1472             {
1473                 size_t len;
1474                 int substring;
1475                 const char *eq;
1476
1477                 if ((eq = strchr(s, '=')))
1478                     substring = 0;
1479                 else if ((eq = strchr(s, '~')))
1480                     substring = 1;
1481                 if (eq)
1482                     len = eq - s;
1483                 else
1484                     len = strlen(s);
1485                 if (len == strlen((const char *)type) &&
1486                     !memcmp((const char *) type, s, len))
1487                 {
1488                     xmlChar *value = xmlNodeGetContent(n);
1489                     if (value && *value)
1490                     {
1491                         if (!eq ||
1492                             (substring && strstr((const char *) value, eq+1)) ||
1493                             (!substring && !strcmp((const char *) value, eq + 1)))
1494                             match = 1;
1495                     }
1496                     xmlFree(value);
1497                 }
1498                 xmlFree(type);
1499             }
1500         }
1501     }
1502     return match;
1503 }
1504
1505
1506 static int ingest_to_cluster(struct client *cl,
1507                              xmlDoc *xdoc,
1508                              xmlNode *root,
1509                              int record_no,
1510                              const char *mergekey_norm);
1511
1512 /** \brief ingest XML record
1513     \param cl client holds the result set for record
1514     \param rec record buffer (0 terminated)
1515     \param record_no record position (1, 2, ..)
1516     \param nmem working NMEM
1517     \retval 0 OK
1518     \retval -1 failure
1519     \retval -2 Filtered
1520 */
1521 int ingest_record(struct client *cl, const char *rec,
1522                   int record_no, NMEM nmem)
1523 {
1524     struct session *se = client_get_session(cl);
1525     int ret = 0;
1526     struct session_database *sdb = client_get_database(cl);
1527     struct conf_service *service = se->service;
1528     xmlDoc *xdoc = normalize_record(se, sdb, service, rec, nmem);
1529     xmlNode *root;
1530     const char *mergekey_norm;
1531
1532     if (!xdoc)
1533         return -1;
1534
1535     root = xmlDocGetRootElement(xdoc);
1536
1537     if (!check_record_filter(root, sdb))
1538     {
1539         session_log(se, YLOG_LOG, "Filtered out record no %d from %s",
1540                     record_no, sdb->database->id);
1541         xmlFreeDoc(xdoc);
1542         return -2;
1543     }
1544
1545     mergekey_norm = get_mergekey(xdoc, cl, record_no, service, nmem);
1546     if (!mergekey_norm)
1547     {
1548         session_log(se, YLOG_WARN, "Got no mergekey");
1549         xmlFreeDoc(xdoc);
1550         return -1;
1551     }
1552     session_enter(se);
1553     if (client_get_session(cl) == se)
1554         ingest_to_cluster(cl, xdoc, root, record_no, mergekey_norm);
1555     session_leave(se);
1556
1557     xmlFreeDoc(xdoc);
1558     return ret;
1559 }
1560
1561 static int ingest_to_cluster(struct client *cl,
1562                              xmlDoc *xdoc,
1563                              xmlNode *root,
1564                              int record_no,
1565                              const char *mergekey_norm)
1566 {
1567     xmlNode *n;
1568     xmlChar *type = 0;
1569     xmlChar *value = 0;
1570     struct session *se = client_get_session(cl);
1571     struct conf_service *service = se->service;
1572     int term_factor = 1;
1573     struct record_cluster *cluster;
1574     struct session_database *sdb = client_get_database(cl);
1575     struct record *record = record_create(se->nmem,
1576                                           service->num_metadata,
1577                                           service->num_sortkeys, cl,
1578                                           record_no);
1579
1580     for (n = root->children; n; n = n->next)
1581     {
1582         if (type)
1583             xmlFree(type);
1584         if (value)
1585             xmlFree(value);
1586         type = value = 0;
1587
1588         if (n->type != XML_ELEMENT_NODE)
1589             continue;
1590         if (!strcmp((const char *) n->name, "metadata"))
1591         {
1592             struct conf_metadata *ser_md = 0;
1593             struct record_metadata **wheretoput = 0;
1594             struct record_metadata *rec_md = 0;
1595             int md_field_id = -1;
1596
1597             type = xmlGetProp(n, (xmlChar *) "type");
1598             value = xmlNodeListGetString(xdoc, n->children, 1);
1599
1600             if (!type || !value || !*value)
1601                 continue;
1602
1603             md_field_id
1604                 = conf_service_metadata_field_id(service, (const char *) type);
1605             if (md_field_id < 0)
1606             {
1607                 if (se->number_of_warnings_unknown_metadata == 0)
1608                 {
1609                     session_log(se, YLOG_WARN,
1610                             "Ignoring unknown metadata element: %s", type);
1611                 }
1612                 se->number_of_warnings_unknown_metadata++;
1613                 continue;
1614             }
1615
1616             ser_md = &service->metadata[md_field_id];
1617
1618             // non-merged metadata
1619             rec_md = record_metadata_init(se->nmem, (const char *) value,
1620                                           ser_md->type, n->properties);
1621             if (!rec_md)
1622             {
1623                 session_log(se, YLOG_WARN, "bad metadata data '%s' "
1624                             "for element '%s'", value, type);
1625                 continue;
1626             }
1627             wheretoput = &record->metadata[md_field_id];
1628             while (*wheretoput)
1629                 wheretoput = &(*wheretoput)->next;
1630             *wheretoput = rec_md;
1631         }
1632     }
1633
1634     cluster = reclist_insert(se->reclist, service, record,
1635                              mergekey_norm, &se->total_merged);
1636     if (!cluster)
1637         return -1;
1638
1639     {
1640         const char *use_term_factor_str =
1641             session_setting_oneval(sdb, PZ_TERMLIST_TERM_FACTOR);
1642         if (use_term_factor_str && use_term_factor_str[0] == '1')
1643         {
1644             int maxrecs = client_get_maxrecs(cl);
1645             int hits = (int) client_get_hits(cl);
1646             term_factor = MAX(hits, maxrecs) /  MAX(1, maxrecs);
1647             assert(term_factor >= 1);
1648             yaz_log(YLOG_DEBUG, "Using term factor: %d (%d / %d)", term_factor, MAX(hits, maxrecs), MAX(1, maxrecs));
1649         }
1650     }
1651
1652     if (global_parameters.dump_records)
1653         session_log(se, YLOG_LOG, "Cluster id %s from %s (#%d)", cluster->recid,
1654                     sdb->database->id, record_no);
1655
1656
1657     relevance_newrec(se->relevance, cluster);
1658
1659     // now parsing XML record and adding data to cluster or record metadata
1660     for (n = root->children; n; n = n->next)
1661     {
1662         pp2_charset_token_t prt;
1663         if (type)
1664             xmlFree(type);
1665         if (value)
1666             xmlFree(value);
1667         type = value = 0;
1668
1669         if (n->type != XML_ELEMENT_NODE)
1670             continue;
1671         if (!strcmp((const char *) n->name, "metadata"))
1672         {
1673             struct conf_metadata *ser_md = 0;
1674             struct conf_sortkey *ser_sk = 0;
1675             struct record_metadata **wheretoput = 0;
1676             struct record_metadata *rec_md = 0;
1677             int md_field_id = -1;
1678             int sk_field_id = -1;
1679
1680             type = xmlGetProp(n, (xmlChar *) "type");
1681             value = xmlNodeListGetString(xdoc, n->children, 1);
1682
1683             if (!type || !value || !*value)
1684                 continue;
1685
1686             md_field_id
1687                 = conf_service_metadata_field_id(service, (const char *) type);
1688             if (md_field_id < 0)
1689                 continue;
1690
1691             ser_md = &service->metadata[md_field_id];
1692
1693             if (ser_md->sortkey_offset >= 0)
1694             {
1695                 sk_field_id = ser_md->sortkey_offset;
1696                 ser_sk = &service->sortkeys[sk_field_id];
1697             }
1698
1699             // merged metadata
1700             rec_md = record_metadata_init(se->nmem, (const char *) value,
1701                                           ser_md->type, 0);
1702             if (!rec_md)
1703                 continue;
1704
1705             wheretoput = &cluster->metadata[md_field_id];
1706
1707             // and polulate with data:
1708             // assign cluster or record based on merge action
1709             if (ser_md->merge == Metadata_merge_unique)
1710             {
1711                 while (*wheretoput)
1712                 {
1713                     if (!strcmp((const char *) (*wheretoput)->data.text.disp,
1714                                 rec_md->data.text.disp))
1715                         break;
1716                     wheretoput = &(*wheretoput)->next;
1717                 }
1718                 if (!*wheretoput)
1719                     *wheretoput = rec_md;
1720             }
1721             else if (ser_md->merge == Metadata_merge_longest)
1722             {
1723                 if (!*wheretoput
1724                     || strlen(rec_md->data.text.disp)
1725                     > strlen((*wheretoput)->data.text.disp))
1726                 {
1727                     *wheretoput = rec_md;
1728                     if (ser_sk)
1729                     {
1730                         const char *sort_str = 0;
1731                         int skip_article =
1732                             ser_sk->type == Metadata_sortkey_skiparticle;
1733
1734                         if (!cluster->sortkeys[sk_field_id])
1735                             cluster->sortkeys[sk_field_id] =
1736                                 nmem_malloc(se->nmem,
1737                                             sizeof(union data_types));
1738
1739                         prt =
1740                             pp2_charset_token_create(service->charsets, "sort");
1741
1742                         pp2_charset_token_first(prt, rec_md->data.text.disp,
1743                                                 skip_article);
1744
1745                         pp2_charset_token_next(prt);
1746
1747                         sort_str = pp2_get_sort(prt);
1748
1749                         cluster->sortkeys[sk_field_id]->text.disp =
1750                             rec_md->data.text.disp;
1751                         if (!sort_str)
1752                         {
1753                             sort_str = rec_md->data.text.disp;
1754                             session_log(se, YLOG_WARN,
1755                                     "Could not make sortkey. Bug #1858");
1756                         }
1757                         cluster->sortkeys[sk_field_id]->text.sort =
1758                             nmem_strdup(se->nmem, sort_str);
1759                         pp2_charset_token_destroy(prt);
1760                     }
1761                 }
1762             }
1763             else if (ser_md->merge == Metadata_merge_all)
1764             {
1765                 while (*wheretoput)
1766                     wheretoput = &(*wheretoput)->next;
1767                 *wheretoput = rec_md;
1768             }
1769             else if (ser_md->merge == Metadata_merge_range)
1770             {
1771                 if (!*wheretoput)
1772                 {
1773                     *wheretoput = rec_md;
1774                     if (ser_sk)
1775                         cluster->sortkeys[sk_field_id]
1776                             = &rec_md->data;
1777                 }
1778                 else
1779                 {
1780                     int this_min = rec_md->data.number.min;
1781                     int this_max = rec_md->data.number.max;
1782                     if (this_min < (*wheretoput)->data.number.min)
1783                         (*wheretoput)->data.number.min = this_min;
1784                     if (this_max > (*wheretoput)->data.number.max)
1785                         (*wheretoput)->data.number.max = this_max;
1786                 }
1787             }
1788
1789
1790             // ranking of _all_ fields enabled ...
1791             if (ser_md->rank)
1792                 relevance_countwords(se->relevance, cluster,
1793                                      (char *) value, ser_md->rank,
1794                                      ser_md->name);
1795
1796             // construct facets ... unless the client already has reported them
1797             if (ser_md->termlist && !client_has_facet(cl, (char *) type))
1798             {
1799                 if (ser_md->type == Metadata_type_year)
1800                 {
1801                     char year[64];
1802                     sprintf(year, "%d", rec_md->data.number.max);
1803
1804                     add_facet(se, (char *) type, year, term_factor);
1805                     if (rec_md->data.number.max != rec_md->data.number.min)
1806                     {
1807                         sprintf(year, "%d", rec_md->data.number.min);
1808                         add_facet(se, (char *) type, year, term_factor);
1809                     }
1810                 }
1811                 else
1812                     add_facet(se, (char *) type, (char *) value, term_factor);
1813             }
1814
1815             // cleaning up
1816             xmlFree(type);
1817             xmlFree(value);
1818             type = value = 0;
1819         }
1820         else
1821         {
1822             if (se->number_of_warnings_unknown_elements == 0)
1823                 session_log(se, YLOG_WARN,
1824                         "Unexpected element in internal record: %s", n->name);
1825             se->number_of_warnings_unknown_elements++;
1826         }
1827     }
1828     if (type)
1829         xmlFree(type);
1830     if (value)
1831         xmlFree(value);
1832
1833     relevance_donerecord(se->relevance, cluster);
1834     se->total_records++;
1835
1836     return 0;
1837 }
1838
1839 void session_log(struct session *s, int level, const char *fmt, ...)
1840 {
1841     char buf[1024];
1842     va_list ap;
1843     va_start(ap, fmt);
1844
1845     yaz_vsnprintf(buf, sizeof(buf)-30, fmt, ap);
1846     yaz_log(level, "Session (%u): %s", s->session_id, buf);
1847
1848     va_end(ap);
1849 }
1850
1851 /*
1852  * Local variables:
1853  * c-basic-offset: 4
1854  * c-file-style: "Stroustrup"
1855  * indent-tabs-mode: nil
1856  * End:
1857  * vim: shiftwidth=4 tabstop=8 expandtab
1858  */
1859