src/logic.c

   1 /* $Id: logic.c,v 1.12 2007-04-20 04:32:33 quinn Exp $
   2    Copyright (c) 2006-2007, Index Data.
   3
   4 This file is part of Pazpar2.
   5
   6 Pazpar2 is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 2, or (at your option) any later
   9 version.
  10
  11 Pazpar2 is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with Pazpar2; see the file LICENSE.  If not, write to the
  18 Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  19 02111-1307, USA.
  20  */
  21
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include <string.h>
  25 #include <sys/time.h>
  26 #include <unistd.h>
  27 #include <sys/socket.h>
  28 #include <netdb.h>
  29 #include <signal.h>
  30 #include <ctype.h>
  31 #include <assert.h>
  32
  33 #include <yaz/marcdisp.h>
  34 #include <yaz/comstack.h>
  35 #include <yaz/tcpip.h>
  36 #include <yaz/proto.h>
  37 #include <yaz/readconf.h>
  38 #include <yaz/pquery.h>
  39 #include <yaz/otherinfo.h>
  40 #include <yaz/yaz-util.h>
  41 #include <yaz/nmem.h>
  42 #include <yaz/query-charset.h>
  43 #include <yaz/querytowrbuf.h>
  44 #if YAZ_VERSIONL >= 0x020163
  45 #include <yaz/oid_db.h>
  46 #endif
  47
  48 #if HAVE_CONFIG_H
  49 #include "cconfig.h"
  50 #endif
  51
  52 #define USE_TIMING 0
  53 #if USE_TIMING
  54 #include <yaz/timing.h>
  55 #endif
  56
  57 #include <netinet/in.h>
  58
  59 #include "pazpar2.h"
  60 #include "eventl.h"
  61 #include "http.h"
  62 #include "termlists.h"
  63 #include "reclists.h"
  64 #include "relevance.h"
  65 #include "config.h"
  66 #include "database.h"
  67 #include "settings.h"
  68
  69 #define MAX_CHUNK 15
  70
  71 static void client_fatal(struct client *cl);
  72 static void connection_destroy(struct connection *co);
  73 static int client_prep_connection(struct client *cl);
  74 static void ingest_records(struct client *cl, Z_Records *r);
  75 void session_alert_watch(struct session *s, int what);
  76
  77 static struct connection *connection_freelist = 0;
  78 static struct client *client_freelist = 0;
  79
  80 static char *client_states[] = {
  81     "Client_Connecting",
  82     "Client_Connected",
  83     "Client_Idle",
  84     "Client_Initializing",
  85     "Client_Searching",
  86     "Client_Presenting",
  87     "Client_Error",
  88     "Client_Failed",
  89     "Client_Disconnected",
  90     "Client_Stopped"
  91 };
  92
  93 // Note: Some things in this structure will eventually move to configuration
  94 struct parameters global_parameters =
  95 {
  96     "",
  97     "",
  98     "",
  99     "",
 100     0,
 101     0,
 102     30,
 103     "81",
 104     "Index Data PazPar2",
 105     VERSION,
 106     600, // 10 minutes
 107     60,
 108     100,
 109     MAX_CHUNK,
 110     0,
 111     0
 112 };
 113
 114 static int send_apdu(struct client *c, Z_APDU *a)
 115 {
 116     struct connection *co = c->connection;
 117     char *buf;
 118     int len, r;
 119
 120     if (!z_APDU(global_parameters.odr_out, &a, 0, 0))
 121     {
 122         odr_perror(global_parameters.odr_out, "Encoding APDU");
 123         abort();
 124     }
 125     buf = odr_getbuf(global_parameters.odr_out, &len, 0);
 126     r = cs_put(co->link, buf, len);
 127     if (r < 0)
 128     {
 129         yaz_log(YLOG_WARN, "cs_put: %s", cs_errmsg(cs_errno(co->link)));
 130         return -1;
 131     }
 132     else if (r == 1)
 133     {
 134         fprintf(stderr, "cs_put incomplete (ParaZ does not handle that)\n");
 135         exit(1);
 136     }
 137     odr_reset(global_parameters.odr_out); /* release the APDU structure  */
 138     co->state = Conn_Waiting;
 139     return 0;
 140 }
 141
 142 // Set authentication token in init if one is set for the client
 143 // TODO: Extend this to handle other schemes than open (should be simple)
 144 static void init_authentication(struct client *cl, Z_InitRequest *req)
 145 {
 146     struct session_database *sdb = cl->database;
 147     char *auth = session_setting_oneval(sdb, PZ_AUTHENTICATION);
 148
 149     if (auth)
 150     {
 151         Z_IdAuthentication *idAuth = odr_malloc(global_parameters.odr_out,
 152                 sizeof(*idAuth));
 153         idAuth->which = Z_IdAuthentication_open;
 154         idAuth->u.open = auth;
 155         req->idAuthentication = idAuth;
 156     }
 157 }
 158
 159 static void send_init(IOCHAN i)
 160 {
 161
 162     struct connection *co = iochan_getdata(i);
 163     struct client *cl = co->client;
 164     Z_APDU *a = zget_APDU(global_parameters.odr_out, Z_APDU_initRequest);
 165
 166     a->u.initRequest->implementationId = global_parameters.implementationId;
 167     a->u.initRequest->implementationName = global_parameters.implementationName;
 168     a->u.initRequest->implementationVersion =
 169         global_parameters.implementationVersion;
 170     ODR_MASK_SET(a->u.initRequest->options, Z_Options_search);
 171     ODR_MASK_SET(a->u.initRequest->options, Z_Options_present);
 172     ODR_MASK_SET(a->u.initRequest->options, Z_Options_namedResultSets);
 173
 174     ODR_MASK_SET(a->u.initRequest->protocolVersion, Z_ProtocolVersion_1);
 175     ODR_MASK_SET(a->u.initRequest->protocolVersion, Z_ProtocolVersion_2);
 176     ODR_MASK_SET(a->u.initRequest->protocolVersion, Z_ProtocolVersion_3);
 177
 178     init_authentication(cl, a->u.initRequest);
 179
 180     /* add virtual host if tunneling through Z39.50 proxy */
 181
 182     if (0 < strlen(global_parameters.zproxy_override)
 183         && 0 < strlen(cl->database->database->url))
 184     {
 185 #if YAZ_VERSIONL >= 0x020163
 186         yaz_oi_set_string_oid(&a->u.initRequest->otherInfo,
 187                               global_parameters.odr_out,
 188                               yaz_oid_userinfo_proxy,
 189                               1, cl->database->database->url);
 190 #else
 191         yaz_oi_set_string_oidval(&a->u.initRequest->otherInfo,
 192                                  global_parameters.odr_out, VAL_PROXY,
 193                                  1, cl->database->database->url);
 194 #endif
 195     }
 196
 197     if (send_apdu(cl, a) >= 0)
 198     {
 199         iochan_setflags(i, EVENT_INPUT);
 200         cl->state = Client_Initializing;
 201     }
 202     else
 203         cl->state = Client_Error;
 204     odr_reset(global_parameters.odr_out);
 205 }
 206
 207 // Recursively traverse query structure to extract terms.
 208 static void pull_terms(NMEM nmem, struct ccl_rpn_node *n, char **termlist, int *num)
 209 {
 210     char **words;
 211     int numwords;
 212     int i;
 213
 214     switch (n->kind)
 215     {
 216         case CCL_RPN_AND:
 217         case CCL_RPN_OR:
 218         case CCL_RPN_NOT:
 219         case CCL_RPN_PROX:
 220             pull_terms(nmem, n->u.p[0], termlist, num);
 221             pull_terms(nmem, n->u.p[1], termlist, num);
 222             break;
 223         case CCL_RPN_TERM:
 224             nmem_strsplit(nmem, " ", n->u.t.term, &words, &numwords);
 225             for (i = 0; i < numwords; i++)
 226                 termlist[(*num)++] = words[i];
 227             break;
 228         default: // NOOP
 229             break;
 230     }
 231 }
 232
 233 // Extract terms from query into null-terminated termlist
 234 static void extract_terms(NMEM nmem, struct ccl_rpn_node *query, char **termlist)
 235 {
 236     int num = 0;
 237
 238     pull_terms(nmem, query, termlist, &num);
 239     termlist[num] = 0;
 240 }
 241
 242 static void send_search(IOCHAN i)
 243 {
 244     struct connection *co = iochan_getdata(i);
 245     struct client *cl = co->client;
 246     struct session *se = cl->session;
 247     struct session_database *sdb = cl->database;
 248     Z_APDU *a = zget_APDU(global_parameters.odr_out, Z_APDU_searchRequest);
 249     int ndb;
 250     char **databaselist;
 251     Z_Query *zquery;
 252     int ssub = 0, lslb = 100000, mspn = 10;
 253     char *recsyn = 0;
 254     char *piggyback = 0;
 255     char *queryenc = 0;
 256     yaz_iconv_t iconv = 0;
 257
 258     yaz_log(YLOG_DEBUG, "Sending search to %s", cl->database->database->url);
 259
 260     // constructing RPN query
 261     a->u.searchRequest->query = zquery = odr_malloc(global_parameters.odr_out,
 262             sizeof(Z_Query));
 263     zquery->which = Z_Query_type_1;
 264     zquery->u.type_1 = p_query_rpn(global_parameters.odr_out, cl->pquery);
 265
 266     // converting to target encoding
 267     if ((queryenc = session_setting_oneval(sdb, PZ_QUERYENCODING))){
 268         iconv = yaz_iconv_open(queryenc, "UTF-8");
 269         if (iconv){
 270             yaz_query_charset_convert_rpnquery(zquery->u.type_1,
 271                                                global_parameters.odr_out,
 272                                                iconv);
 273             yaz_iconv_close(iconv);
 274         } else
 275             yaz_log(YLOG_WARN, "Query encoding failed %s %s",
 276                     cl->database->database->url, queryenc);
 277     }
 278
 279     for (ndb = 0; sdb->database->databases[ndb]; ndb++)
 280         ;
 281     databaselist = odr_malloc(global_parameters.odr_out, sizeof(char*) * ndb);
 282     for (ndb = 0; sdb->database->databases[ndb]; ndb++)
 283         databaselist[ndb] = sdb->database->databases[ndb];
 284
 285     if (!(piggyback = session_setting_oneval(sdb, PZ_PIGGYBACK)) || *piggyback == '1')
 286     {
 287         if ((recsyn = session_setting_oneval(sdb, PZ_REQUESTSYNTAX)))
 288         {
 289 #if YAZ_VERSIONL >= 0x020163
 290             a->u.searchRequest->preferredRecordSyntax =
 291                 yaz_string_to_oid_odr(yaz_oid_std(),
 292                                       CLASS_RECSYN, recsyn,
 293                                       global_parameters.odr_out);
 294 #else
 295             a->u.searchRequest->preferredRecordSyntax =
 296                 yaz_str_to_z3950oid(global_parameters.odr_out,
 297                                     CLASS_RECSYN, recsyn);
 298 #endif
 299         }
 300         a->u.searchRequest->smallSetUpperBound = &ssub;
 301         a->u.searchRequest->largeSetLowerBound = &lslb;
 302         a->u.searchRequest->mediumSetPresentNumber = &mspn;
 303     }
 304     a->u.searchRequest->resultSetName = "Default";
 305     a->u.searchRequest->databaseNames = databaselist;
 306     a->u.searchRequest->num_databaseNames = ndb;
 307
 308
 309     {  //scope for sending and logging queries
 310         WRBUF wbquery = wrbuf_alloc();
 311         yaz_query_to_wrbuf(wbquery, zquery);
 312
 313
 314         if (send_apdu(cl, a) >= 0)
 315             {
 316                 iochan_setflags(i, EVENT_INPUT);
 317                 cl->state = Client_Searching;
 318                 cl->requestid = se->requestid;
 319                 yaz_log(YLOG_LOG, "SearchRequest %s %s %s",
 320                          cl->database->database->url,
 321                         queryenc ? queryenc : "UTF-8",
 322                         wrbuf_cstr(wbquery));
 323             }
 324         else {
 325             cl->state = Client_Error;
 326                 yaz_log(YLOG_WARN, "Failed SearchRequest %s  %s %s",
 327                          cl->database->database->url,
 328                         queryenc ? queryenc : "UTF-8",
 329                         wrbuf_cstr(wbquery));
 330         }
 331
 332         wrbuf_destroy(wbquery);
 333     }
 334
 335     odr_reset(global_parameters.odr_out);
 336 }
 337
 338 static void send_present(IOCHAN i)
 339 {
 340     struct connection *co = iochan_getdata(i);
 341     struct client *cl = co->client;
 342     struct session_database *sdb = cl->database;
 343     Z_APDU *a = zget_APDU(global_parameters.odr_out, Z_APDU_presentRequest);
 344     int toget;
 345     int start = cl->records + 1;
 346     char *recsyn;
 347
 348     toget = global_parameters.chunk;
 349     if (toget > global_parameters.toget - cl->records)
 350         toget = global_parameters.toget - cl->records;
 351     if (toget > cl->hits - cl->records)
 352         toget = cl->hits - cl->records;
 353
 354     yaz_log(YLOG_DEBUG, "Trying to present %d records\n", toget);
 355
 356     a->u.presentRequest->resultSetStartPoint = &start;
 357     a->u.presentRequest->numberOfRecordsRequested = &toget;
 358
 359     a->u.presentRequest->resultSetId = "Default";
 360
 361     if ((recsyn = session_setting_oneval(sdb, PZ_REQUESTSYNTAX)))
 362     {
 363 #if YAZ_VERSIONL >= 0x020163
 364         a->u.presentRequest->preferredRecordSyntax =
 365             yaz_string_to_oid_odr(yaz_oid_std(),
 366                                   CLASS_RECSYN, recsyn,
 367                                   global_parameters.odr_out);
 368 #else
 369         a->u.presentRequest->preferredRecordSyntax =
 370             yaz_str_to_z3950oid(global_parameters.odr_out,
 371                                 CLASS_RECSYN, recsyn);
 372 #endif
 373     }
 374
 375     if (send_apdu(cl, a) >= 0)
 376     {
 377         iochan_setflags(i, EVENT_INPUT);
 378         cl->state = Client_Presenting;
 379     }
 380     else
 381         cl->state = Client_Error;
 382     odr_reset(global_parameters.odr_out);
 383 }
 384
 385 static void do_initResponse(IOCHAN i, Z_APDU *a)
 386 {
 387     struct connection *co = iochan_getdata(i);
 388     struct client *cl = co->client;
 389     Z_InitResponse *r = a->u.initResponse;
 390
 391     yaz_log(YLOG_DEBUG, "Init response %s", cl->database->database->url);
 392
 393     if (*r->result)
 394     {
 395         cl->state = Client_Idle;
 396     }
 397     else
 398         cl->state = Client_Failed; // FIXME need to do something to the connection
 399 }
 400
 401 static void do_searchResponse(IOCHAN i, Z_APDU *a)
 402 {
 403     struct connection *co = iochan_getdata(i);
 404     struct client *cl = co->client;
 405     struct session *se = cl->session;
 406     Z_SearchResponse *r = a->u.searchResponse;
 407
 408     yaz_log(YLOG_DEBUG, "Search response %s (status=%d)",
 409             cl->database->database->url, *r->searchStatus);
 410
 411     if (*r->searchStatus)
 412     {
 413         cl->hits = *r->resultCount;
 414         se->total_hits += cl->hits;
 415         if (r->presentStatus && !*r->presentStatus && r->records)
 416         {
 417             yaz_log(YLOG_DEBUG, "Records in search response %s",
 418                     cl->database->database->url);
 419             ingest_records(cl, r->records);
 420         }
 421         cl->state = Client_Idle;
 422     }
 423     else
 424     {          /*"FAILED"*/
 425         cl->hits = 0;
 426         cl->state = Client_Error;
 427         if (r->records) {
 428             Z_Records *recs = r->records;
 429             if (recs->which == Z_Records_NSD)
 430             {
 431                 yaz_log(YLOG_WARN,
 432                         "Search response: Non-surrogate diagnostic %s",
 433                         cl->database->database->url);
 434                 cl->diagnostic = *recs->u.nonSurrogateDiagnostic->condition;
 435                 cl->state = Client_Error;
 436             }
 437         }
 438     }
 439 }
 440
 441 static void do_closeResponse(IOCHAN i, Z_APDU *a)
 442 {
 443     struct connection *co = iochan_getdata(i);
 444     struct client *cl = co->client;
 445     /* Z_Close *r = a->u.close; */
 446
 447     yaz_log(YLOG_WARN, "Close response %s", cl->database->database->url);
 448
 449     cl->state = Client_Failed;
 450     connection_destroy(co);
 451 }
 452
 453
 454 char *normalize_mergekey(char *buf, int skiparticle)
 455 {
 456     char *p = buf, *pout = buf;
 457
 458     if (skiparticle)
 459     {
 460         char firstword[64];
 461         char articles[] = "the den der die des an a "; // must end in space
 462
 463         while (*p && !isalnum(*p))
 464             p++;
 465         pout = firstword;
 466         while (*p && *p != ' ' && pout - firstword < 62)
 467             *(pout++) = tolower(*(p++));
 468         *(pout++) = ' ';
 469         *(pout++) = '\0';
 470         if (!strstr(articles, firstword))
 471             p = buf;
 472         pout = buf;
 473     }
 474
 475     while (*p)
 476     {
 477         while (*p && !isalnum(*p))
 478             p++;
 479         while (isalnum(*p))
 480             *(pout++) = tolower(*(p++));
 481         if (*p)
 482             *(pout++) = ' ';
 483         while (*p && !isalnum(*p))
 484             p++;
 485     }
 486     if (buf != pout)
 487         do {
 488             *(pout--) = '\0';
 489         }
 490         while (pout > buf && *pout == ' ');
 491
 492     return buf;
 493 }
 494
 495 static void add_facet(struct session *s, const char *type, const char *value)
 496 {
 497     int i;
 498
 499     if (!*value)
 500         return;
 501     for (i = 0; i < s->num_termlists; i++)
 502         if (!strcmp(s->termlists[i].name, type))
 503             break;
 504     if (i == s->num_termlists)
 505     {
 506         if (i == SESSION_MAX_TERMLISTS)
 507         {
 508             yaz_log(YLOG_FATAL, "Too many termlists");
 509             exit(1);
 510         }
 511         s->termlists[i].name = nmem_strdup(s->nmem, type);
 512         s->termlists[i].termlist = termlist_create(s->nmem, s->expected_maxrecs, 15);
 513         s->num_termlists = i + 1;
 514     }
 515     termlist_insert(s->termlists[i].termlist, value);
 516 }
 517
 518 static xmlDoc *normalize_record(struct client *cl, Z_External *rec)
 519 {
 520     struct database_retrievalmap *m;
 521     struct database *db = cl->database->database;
 522     xmlNode *res;
 523     xmlDoc *rdoc;
 524
 525     // First normalize to XML
 526     if (db->yaz_marc)
 527     {
 528         char *buf;
 529         int len;
 530         if (rec->which != Z_External_octet)
 531         {
 532             yaz_log(YLOG_WARN, "Unexpected external branch, probably BER %s",
 533                     cl->database->database->url);
 534             return 0;
 535         }
 536         buf = (char*) rec->u.octet_aligned->buf;
 537         len = rec->u.octet_aligned->len;
 538         if (yaz_marc_read_iso2709(db->yaz_marc, buf, len) < 0)
 539         {
 540             yaz_log(YLOG_WARN, "Failed to decode MARC %s",
 541                     cl->database->database->url);
 542             return 0;
 543         }
 544
 545         yaz_marc_write_using_libxml2(db->yaz_marc, 1);
 546         if (yaz_marc_write_xml(db->yaz_marc, &res,
 547                     "http://www.loc.gov/MARC21/slim", 0, 0) < 0)
 548         {
 549             yaz_log(YLOG_WARN, "Failed to encode as XML %s",
 550                     cl->database->database->url);
 551             return 0;
 552         }
 553         rdoc = xmlNewDoc((xmlChar *) "1.0");
 554         xmlDocSetRootElement(rdoc, res);
 555
 556     }
 557     else
 558     {
 559         yaz_log(YLOG_FATAL,
 560                 "Unknown native_syntax in normalize_record from %s",
 561                 cl->database->database->url);
 562         exit(1);
 563     }
 564
 565     if (global_parameters.dump_records){
 566         fprintf(stderr,
 567                 "Input Record (normalized) from %s\n----------------\n",
 568                 cl->database->database->url);
 569 #if LIBXML_VERSION >= 20600
 570         xmlDocFormatDump(stderr, rdoc, 1);
 571 #else
 572         xmlDocDump(stderr, rdoc);
 573 #endif
 574     }
 575
 576     for (m = db->map; m; m = m->next){
 577         xmlDoc *new = 0;
 578
 579 #if 1
 580         {
 581             xmlNodePtr root = 0;
 582             new = xsltApplyStylesheet(m->stylesheet, rdoc, 0);
 583             root= xmlDocGetRootElement(new);
 584         if (!new || !root || !(root->children))
 585         {
 586             yaz_log(YLOG_WARN, "XSLT transformation failed from %s",
 587                     cl->database->database->url);
 588             xmlFreeDoc(new);
 589             xmlFreeDoc(rdoc);
 590             return 0;
 591         }
 592         }
 593 #endif
 594
 595 #if 0
 596         // do it another way to detect transformation errors right now
 597         // but does not seem to work either!
 598         {
 599             xsltTransformContextPtr ctxt;
 600             ctxt = xsltNewTransformContext(m->stylesheet, rdoc);
 601             new = xsltApplyStylesheetUser(m->stylesheet, rdoc, 0, 0, 0, ctxt);
 602             if ((ctxt->state == XSLT_STATE_ERROR) ||
 603                 (ctxt->state == XSLT_STATE_STOPPED)){
 604                 yaz_log(YLOG_WARN, "XSLT transformation failed from %s",
 605                         cl->database->database->url);
 606                 xmlFreeDoc(new);
 607                 xmlFreeDoc(rdoc);
 608                 return 0;
 609             }
 610         }
 611 #endif
 612
 613         xmlFreeDoc(rdoc);
 614         rdoc = new;
 615     }
 616     if (global_parameters.dump_records)
 617     {
 618         fprintf(stderr, "Record from %s\n----------------\n",
 619                 cl->database->database->url);
 620 #if LIBXML_VERSION >= 20600
 621         xmlDocFormatDump(stderr, rdoc, 1);
 622 #else
 623         xmlDocDump(stderr, rdoc);
 624 #endif
 625     }
 626     return rdoc;
 627 }
 628
 629 // Extract what appears to be years from buf, storing highest and
 630 // lowest values.
 631 static int extract_years(const char *buf, int *first, int *last)
 632 {
 633     *first = -1;
 634     *last = -1;
 635     while (*buf)
 636     {
 637         const char *e;
 638         int len;
 639
 640         while (*buf && !isdigit(*buf))
 641             buf++;
 642         len = 0;
 643         for (e = buf; *e && isdigit(*e); e++)
 644             len++;
 645         if (len == 4)
 646         {
 647             int value = atoi(buf);
 648             if (*first < 0 || value < *first)
 649                 *first = value;
 650             if (*last < 0 || value > *last)
 651                 *last = value;
 652         }
 653         buf = e;
 654     }
 655     return *first;
 656 }
 657
 658 static struct record *ingest_record(struct client *cl, Z_External *rec)
 659 {
 660     xmlDoc *xdoc = normalize_record(cl, rec);
 661     xmlNode *root, *n;
 662     struct record *res;
 663     struct record_cluster *cluster;
 664     struct session *se = cl->session;
 665     xmlChar *mergekey, *mergekey_norm;
 666     xmlChar *type = 0;
 667     xmlChar *value = 0;
 668     struct conf_service *service = global_parameters.server->service;
 669
 670     if (!xdoc)
 671         return 0;
 672
 673     root = xmlDocGetRootElement(xdoc);
 674     if (!(mergekey = xmlGetProp(root, (xmlChar *) "mergekey")))
 675     {
 676         yaz_log(YLOG_WARN, "No mergekey found in record");
 677         xmlFreeDoc(xdoc);
 678         return 0;
 679     }
 680
 681     res = nmem_malloc(se->nmem, sizeof(struct record));
 682     res->next = 0;
 683     res->client = cl;
 684     res->metadata = nmem_malloc(se->nmem,
 685             sizeof(struct record_metadata*) * service->num_metadata);
 686     memset(res->metadata, 0, sizeof(struct record_metadata*) * service->num_metadata);
 687
 688     mergekey_norm = (xmlChar *) nmem_strdup(se->nmem, (char*) mergekey);
 689     xmlFree(mergekey);
 690     normalize_mergekey((char *) mergekey_norm, 0);
 691
 692     cluster = reclist_insert(se->reclist,
 693                              global_parameters.server->service,
 694                              res, (char *) mergekey_norm,
 695                              &se->total_merged);
 696     if (global_parameters.dump_records)
 697         yaz_log(YLOG_LOG, "Cluster id %d from %s (#%d)", cluster->recid,
 698                 cl->database->database->url, cl->records);
 699     if (!cluster)
 700     {
 701         /* no room for record */
 702         xmlFreeDoc(xdoc);
 703         return 0;
 704     }
 705     relevance_newrec(se->relevance, cluster);
 706
 707     for (n = root->children; n; n = n->next)
 708     {
 709         if (type)
 710             xmlFree(type);
 711         if (value)
 712             xmlFree(value);
 713         type = value = 0;
 714
 715         if (n->type != XML_ELEMENT_NODE)
 716             continue;
 717         if (!strcmp((const char *) n->name, "metadata"))
 718         {
 719             struct conf_metadata *md = 0;
 720             struct conf_sortkey *sk = 0;
 721             struct record_metadata **wheretoput, *newm;
 722             int imeta;
 723             int first, last;
 724
 725             type = xmlGetProp(n, (xmlChar *) "type");
 726             value = xmlNodeListGetString(xdoc, n->children, 0);
 727
 728             if (!type || !value)
 729                 continue;
 730
 731             // First, find out what field we're looking at
 732             for (imeta = 0; imeta < service->num_metadata; imeta++)
 733                 if (!strcmp((const char *) type, service->metadata[imeta].name))
 734                 {
 735                     md = &service->metadata[imeta];
 736                     if (md->sortkey_offset >= 0)
 737                         sk = &service->sortkeys[md->sortkey_offset];
 738                     break;
 739                 }
 740             if (!md)
 741             {
 742                 yaz_log(YLOG_WARN, "Ignoring unknown metadata element: %s", type);
 743                 continue;
 744             }
 745
 746             // Find out where we are putting it
 747             if (md->merge == Metadata_merge_no)
 748                 wheretoput = &res->metadata[imeta];
 749             else
 750                 wheretoput = &cluster->metadata[imeta];
 751
 752             // Put it there
 753             newm = nmem_malloc(se->nmem, sizeof(struct record_metadata));
 754             newm->next = 0;
 755             if (md->type == Metadata_type_generic)
 756             {
 757                 char *p, *pe;
 758                 for (p = (char *) value; *p && isspace(*p); p++)
 759                     ;
 760                 for (pe = p + strlen(p) - 1;
 761                         pe > p && strchr(" ,/.:([", *pe); pe--)
 762                     *pe = '\0';
 763                 newm->data.text = nmem_strdup(se->nmem, p);
 764
 765             }
 766             else if (md->type == Metadata_type_year)
 767             {
 768                 if (extract_years((char *) value, &first, &last) < 0)
 769                     continue;
 770             }
 771             else
 772             {
 773                 yaz_log(YLOG_WARN, "Unknown type in metadata element %s", type);
 774                 continue;
 775             }
 776             if (md->type == Metadata_type_year && md->merge != Metadata_merge_range)
 777             {
 778                 yaz_log(YLOG_WARN, "Only range merging supported for years");
 779                 continue;
 780             }
 781             if (md->merge == Metadata_merge_unique)
 782             {
 783                 struct record_metadata *mnode;
 784                 for (mnode = *wheretoput; mnode; mnode = mnode->next)
 785                     if (!strcmp((const char *) mnode->data.text, newm->data.text))
 786                         break;
 787                 if (!mnode)
 788                 {
 789                     newm->next = *wheretoput;
 790                     *wheretoput = newm;
 791                 }
 792             }
 793             else if (md->merge == Metadata_merge_longest)
 794             {
 795                 if (!*wheretoput ||
 796                         strlen(newm->data.text) > strlen((*wheretoput)->data.text))
 797                 {
 798                     *wheretoput = newm;
 799                     if (sk)
 800                     {
 801                         char *s = nmem_strdup(se->nmem, newm->data.text);
 802                         if (!cluster->sortkeys[md->sortkey_offset])
 803                             cluster->sortkeys[md->sortkey_offset] =
 804                                 nmem_malloc(se->nmem, sizeof(union data_types));
 805                         normalize_mergekey(s,
 806                                 (sk->type == Metadata_sortkey_skiparticle));
 807                         cluster->sortkeys[md->sortkey_offset]->text = s;
 808                     }
 809                 }
 810             }
 811             else if (md->merge == Metadata_merge_all || md->merge == Metadata_merge_no)
 812             {
 813                 newm->next = *wheretoput;
 814                 *wheretoput = newm;
 815             }
 816             else if (md->merge == Metadata_merge_range)
 817             {
 818                 assert(md->type == Metadata_type_year);
 819                 if (!*wheretoput)
 820                 {
 821                     *wheretoput = newm;
 822                     (*wheretoput)->data.number.min = first;
 823                     (*wheretoput)->data.number.max = last;
 824                     if (sk)
 825                         cluster->sortkeys[md->sortkey_offset] = &newm->data;
 826                 }
 827                 else
 828                 {
 829                     if (first < (*wheretoput)->data.number.min)
 830                         (*wheretoput)->data.number.min = first;
 831                     if (last > (*wheretoput)->data.number.max)
 832                         (*wheretoput)->data.number.max = last;
 833                 }
 834 #ifdef GAGA
 835                 if (sk)
 836                 {
 837                     union data_types *sdata = cluster->sortkeys[md->sortkey_offset];
 838                     yaz_log(YLOG_LOG, "SK range: %d-%d", sdata->number.min, sdata->number.max);
 839                 }
 840 #endif
 841             }
 842             else
 843                 yaz_log(YLOG_WARN, "Don't know how to merge on element name %s", md->name);
 844
 845             if (md->rank)
 846                 relevance_countwords(se->relevance, cluster,
 847                                      (char *) value, md->rank);
 848             if (md->termlist)
 849             {
 850                 if (md->type == Metadata_type_year)
 851                 {
 852                     char year[64];
 853                     sprintf(year, "%d", last);
 854                     add_facet(se, (char *) type, year);
 855                     if (first != last)
 856                     {
 857                         sprintf(year, "%d", first);
 858                         add_facet(se, (char *) type, year);
 859                     }
 860                 }
 861                 else
 862                     add_facet(se, (char *) type, (char *) value);
 863             }
 864             xmlFree(type);
 865             xmlFree(value);
 866             type = value = 0;
 867         }
 868         else
 869             yaz_log(YLOG_WARN, "Unexpected element %s in internal record", n->name);
 870     }
 871     if (type)
 872         xmlFree(type);
 873     if (value)
 874         xmlFree(value);
 875
 876     xmlFreeDoc(xdoc);
 877
 878     relevance_donerecord(se->relevance, cluster);
 879     se->total_records++;
 880
 881     return res;
 882 }
 883
 884 // Retrieve first defined value for 'name' for given database.
 885 // Will be extended to take into account user associated with session
 886 char *session_setting_oneval(struct session_database *db, int offset)
 887 {
 888     if (!db->settings[offset])
 889         return "";
 890     return db->settings[offset]->value;
 891 }
 892
 893 static void ingest_records(struct client *cl, Z_Records *r)
 894 {
 895 #if USE_TIMING
 896     yaz_timing_t t = yaz_timing_create();
 897 #endif
 898     struct record *rec;
 899     struct session *s = cl->session;
 900     Z_NamePlusRecordList *rlist;
 901     int i;
 902
 903     if (r->which != Z_Records_DBOSD)
 904         return;
 905     rlist = r->u.databaseOrSurDiagnostics;
 906     for (i = 0; i < rlist->num_records; i++)
 907     {
 908         Z_NamePlusRecord *npr = rlist->records[i];
 909
 910         cl->records++;
 911         if (npr->which != Z_NamePlusRecord_databaseRecord)
 912         {
 913             yaz_log(YLOG_WARN,
 914                     "Unexpected record type, probably diagnostic %s",
 915                     cl->database->database->url);
 916             continue;
 917         }
 918
 919         rec = ingest_record(cl, npr->u.databaseRecord);
 920         if (!rec)
 921             continue;
 922     }
 923     if (s->watchlist[SESSION_WATCH_RECORDS].fun && rlist->num_records)
 924         session_alert_watch(s, SESSION_WATCH_RECORDS);
 925
 926 #if USE_TIMING
 927     yaz_timing_stop(t);
 928     yaz_log(YLOG_LOG, "ingest_records %6.5f %3.2f %3.2f",
 929             yaz_timing_get_real(t), yaz_timing_get_user(t),
 930             yaz_timing_get_sys(t));
 931     yaz_timing_destroy(&t);
 932 #endif
 933 }
 934
 935 static void do_presentResponse(IOCHAN i, Z_APDU *a)
 936 {
 937     struct connection *co = iochan_getdata(i);
 938     struct client *cl = co->client;
 939     Z_PresentResponse *r = a->u.presentResponse;
 940
 941     if (r->records) {
 942         Z_Records *recs = r->records;
 943         if (recs->which == Z_Records_NSD)
 944         {
 945             yaz_log(YLOG_WARN, "Non-surrogate diagnostic %s",
 946                     cl->database->database->url);
 947             cl->diagnostic = *recs->u.nonSurrogateDiagnostic->condition;
 948             cl->state = Client_Error;
 949         }
 950     }
 951
 952     if (!*r->presentStatus && cl->state != Client_Error)
 953     {
 954         yaz_log(YLOG_DEBUG, "Good Present response %s",
 955                 cl->database->database->url);
 956         ingest_records(cl, r->records);
 957         cl->state = Client_Idle;
 958     }
 959     else if (*r->presentStatus)
 960     {
 961         yaz_log(YLOG_WARN, "Bad Present response %s",
 962                 cl->database->database->url);
 963         cl->state = Client_Error;
 964     }
 965 }
 966
 967 static void handler(IOCHAN i, int event)
 968 {
 969     struct connection *co = iochan_getdata(i);
 970     struct client *cl = co->client;
 971     struct session *se = 0;
 972
 973     if (cl)
 974         se = cl->session;
 975     else
 976     {
 977         yaz_log(YLOG_WARN, "Destroying orphan connection");
 978         connection_destroy(co);
 979         return;
 980     }
 981
 982     if (co->state == Conn_Connecting && event & EVENT_OUTPUT)
 983     {
 984         int errcode;
 985         socklen_t errlen = sizeof(errcode);
 986
 987         if (getsockopt(cs_fileno(co->link), SOL_SOCKET, SO_ERROR, &errcode,
 988             &errlen) < 0 || errcode != 0)
 989         {
 990             client_fatal(cl);
 991             return;
 992         }
 993         else
 994         {
 995             yaz_log(YLOG_DEBUG, "Connect OK");
 996             co->state = Conn_Open;
 997             if (cl)
 998                 cl->state = Client_Connected;
 999         }
1000     }
1001
1002     else if (event & EVENT_INPUT)
1003     {
1004         int len = cs_get(co->link, &co->ibuf, &co->ibufsize);
1005
1006         if (len < 0)
1007         {
1008             yaz_log(YLOG_WARN|YLOG_ERRNO, "Error reading from %s",
1009                     cl->database->database->url);
1010             connection_destroy(co);
1011             return;
1012         }
1013         else if (len == 0)
1014         {
1015             yaz_log(YLOG_WARN, "EOF reading from %s", cl->database->database->url);
1016             connection_destroy(co);
1017             return;
1018         }
1019         else if (len > 1) // We discard input if we have no connection
1020         {
1021             co->state = Conn_Open;
1022
1023             if (cl && (cl->requestid == se->requestid || cl->state == Client_Initializing))
1024             {
1025                 Z_APDU *a;
1026
1027                 odr_reset(global_parameters.odr_in);
1028                 odr_setbuf(global_parameters.odr_in, co->ibuf, len, 0);
1029                 if (!z_APDU(global_parameters.odr_in, &a, 0, 0))
1030                 {
1031                     client_fatal(cl);
1032                     return;
1033                 }
1034                 switch (a->which)
1035                 {
1036                     case Z_APDU_initResponse:
1037                         do_initResponse(i, a);
1038                         break;
1039                     case Z_APDU_searchResponse:
1040                         do_searchResponse(i, a);
1041                         break;
1042                     case Z_APDU_presentResponse:
1043                         do_presentResponse(i, a);
1044                         break;
1045                     case Z_APDU_close:
1046                         do_closeResponse(i, a);
1047                         break;
1048                     default:
1049                         yaz_log(YLOG_WARN,
1050                                 "Unexpected Z39.50 response from %s",
1051                                 cl->database->database->url);
1052                         client_fatal(cl);
1053                         return;
1054                 }
1055                 // We aren't expecting staggered output from target
1056                 // if (cs_more(t->link))
1057                 //    iochan_setevent(i, EVENT_INPUT);
1058             }
1059             else  // we throw away response and go to idle mode
1060             {
1061                 yaz_log(YLOG_DEBUG, "Ignoring result of expired operation");
1062                 cl->state = Client_Idle;
1063             }
1064         }
1065         /* if len==1 we do nothing but wait for more input */
1066     }
1067
1068     if (cl->state == Client_Connected) {
1069         send_init(i);
1070     }
1071
1072     if (cl->state == Client_Idle)
1073     {
1074         if (cl->requestid != se->requestid && cl->pquery) {
1075             send_search(i);
1076         }
1077         else if (cl->hits > 0 && cl->records < global_parameters.toget &&
1078             cl->records < cl->hits) {
1079             send_present(i);
1080         }
1081     }
1082 }
1083
1084 // Disassociate connection from client
1085 static void connection_release(struct connection *co)
1086 {
1087     struct client *cl = co->client;
1088
1089     yaz_log(YLOG_DEBUG, "Connection release %s", co->host->hostport);
1090     if (!cl)
1091         return;
1092     cl->connection = 0;
1093     co->client = 0;
1094 }
1095
1096 // Close connection and recycle structure
1097 static void connection_destroy(struct connection *co)
1098 {
1099     struct host *h = co->host;
1100     cs_close(co->link);
1101     iochan_destroy(co->iochan);
1102
1103     yaz_log(YLOG_DEBUG, "Connection destroy %s", co->host->hostport);
1104     if (h->connections == co)
1105         h->connections = co->next;
1106     else
1107     {
1108         struct connection *pco;
1109         for (pco = h->connections; pco && pco->next != co; pco = pco->next)
1110             ;
1111         if (pco)
1112             pco->next = co->next;
1113         else
1114             abort();
1115     }
1116     if (co->client)
1117     {
1118         if (co->client->state != Client_Idle)
1119             co->client->state = Client_Disconnected;
1120         co->client->connection = 0;
1121     }
1122     co->next = connection_freelist;
1123     connection_freelist = co;
1124 }
1125
1126 // Creates a new connection for client, associated with the host of
1127 // client's database
1128 static struct connection *connection_create(struct client *cl)
1129 {
1130     struct connection *new;
1131     COMSTACK link;
1132     int res;
1133     void *addr;
1134
1135
1136     if (!(link = cs_create(tcpip_type, 0, PROTO_Z3950)))
1137         {
1138             yaz_log(YLOG_FATAL|YLOG_ERRNO, "Failed to create comstack");
1139             exit(1);
1140         }
1141
1142     if (0 == strlen(global_parameters.zproxy_override)){
1143         /* no Z39.50 proxy needed - direct connect */
1144         yaz_log(YLOG_DEBUG, "Connection create %s", cl->database->database->url);
1145
1146         if (!(addr = cs_straddr(link, cl->database->database->host->ipport)))
1147             {
1148                 yaz_log(YLOG_WARN|YLOG_ERRNO,
1149                         "Lookup of IP address %s failed",
1150                         cl->database->database->host->ipport);
1151                 return 0;
1152             }
1153
1154     } else {
1155         /* Z39.50 proxy connect */
1156         yaz_log(YLOG_DEBUG, "Connection create %s proxy %s",
1157                 cl->database->database->url, global_parameters.zproxy_override);
1158
1159         if (!(addr = cs_straddr(link, global_parameters.zproxy_override)))
1160             {
1161                 yaz_log(YLOG_WARN|YLOG_ERRNO,
1162                         "Lookup of IP address %s failed",
1163                         global_parameters.zproxy_override);
1164                 return 0;
1165             }
1166     }
1167
1168     res = cs_connect(link, addr);
1169     if (res < 0)
1170     {
1171         yaz_log(YLOG_WARN|YLOG_ERRNO, "cs_connect %s", cl->database->database->url);
1172         return 0;
1173     }
1174
1175     if ((new = connection_freelist))
1176         connection_freelist = new->next;
1177     else
1178     {
1179         new = xmalloc(sizeof (struct connection));
1180         new->ibuf = 0;
1181         new->ibufsize = 0;
1182     }
1183     new->state = Conn_Connecting;
1184     new->host = cl->database->database->host;
1185     new->next = new->host->connections;
1186     new->host->connections = new;
1187     new->client = cl;
1188     cl->connection = new;
1189     new->link = link;
1190
1191     new->iochan = iochan_create(cs_fileno(link), handler, 0);
1192     iochan_setdata(new->iochan, new);
1193     pazpar2_add_channel(new->iochan);
1194     return new;
1195 }
1196
1197 // Close connection and set state to error
1198 static void client_fatal(struct client *cl)
1199 {
1200     yaz_log(YLOG_WARN, "Fatal error from %s", cl->database->database->url);
1201     connection_destroy(cl->connection);
1202     cl->state = Client_Error;
1203 }
1204
1205 // Ensure that client has a connection associated
1206 static int client_prep_connection(struct client *cl)
1207 {
1208     struct connection *co;
1209     struct session *se = cl->session;
1210     struct host *host = cl->database->database->host;
1211
1212     co = cl->connection;
1213
1214     yaz_log(YLOG_DEBUG, "Client prep %s", cl->database->database->url);
1215
1216     if (!co)
1217     {
1218         // See if someone else has an idle connection
1219         // We should look at timestamps here to select the longest-idle connection
1220         for (co = host->connections; co; co = co->next)
1221             if (co->state == Conn_Open && (!co->client || co->client->session != se))
1222                 break;
1223         if (co)
1224         {
1225             connection_release(co);
1226             cl->connection = co;
1227             co->client = cl;
1228         }
1229         else
1230             co = connection_create(cl);
1231     }
1232     if (co)
1233     {
1234         if (co->state == Conn_Connecting)
1235         {
1236             cl->state = Client_Connecting;
1237             iochan_setflag(co->iochan, EVENT_OUTPUT);
1238         }
1239         else if (co->state == Conn_Open)
1240         {
1241             if (cl->state == Client_Error || cl->state == Client_Disconnected)
1242                 cl->state = Client_Idle;
1243             iochan_setflag(co->iochan, EVENT_OUTPUT);
1244         }
1245         return 1;
1246     }
1247     else
1248         return 0;
1249 }
1250
1251 // Initialize CCL map for a target
1252 static CCL_bibset prepare_cclmap(struct client *cl)
1253 {
1254     struct session_database *sdb = cl->database;
1255     struct setting *s;
1256     CCL_bibset res;
1257
1258     if (!sdb->settings)
1259         return 0;
1260     res = ccl_qual_mk();
1261     for (s = sdb->settings[PZ_CCLMAP]; s; s = s->next)
1262     {
1263         char *p = strchr(s->name + 3, ':');
1264         if (!p)
1265         {
1266             yaz_log(YLOG_WARN, "Malformed cclmap name: %s", s->name);
1267             ccl_qual_rm(&res);
1268             return 0;
1269         }
1270         p++;
1271         ccl_qual_fitem(res, s->value, p);
1272     }
1273     return res;
1274 }
1275
1276 // Parse the query given the settings specific to this client
1277 static int client_parse_query(struct client *cl, const char *query)
1278 {
1279     struct session *se = cl->session;
1280     struct ccl_rpn_node *cn;
1281     int cerror, cpos;
1282     CCL_bibset ccl_map = prepare_cclmap(cl);
1283
1284     if (!ccl_map)
1285         return -1;
1286     cn = ccl_find_str(ccl_map, query, &cerror, &cpos);
1287     ccl_qual_rm(&ccl_map);
1288     if (!cn)
1289     {
1290         cl->state = Client_Error;
1291         yaz_log(YLOG_WARN, "Failed to parse query for %s",
1292                          cl->database->database->url);
1293         return -1;
1294     }
1295     wrbuf_rewind(se->wrbuf);
1296     ccl_pquery(se->wrbuf, cn);
1297     wrbuf_putc(se->wrbuf, '\0');
1298     if (cl->pquery)
1299         xfree(cl->pquery);
1300     cl->pquery = xstrdup(wrbuf_buf(se->wrbuf));
1301
1302     if (!se->relevance)
1303     {
1304         // Initialize relevance structure with query terms
1305         char *p[512];
1306         extract_terms(se->nmem, cn, p);
1307         se->relevance = relevance_create(se->nmem, (const char **) p,
1308                 se->expected_maxrecs);
1309     }
1310
1311     ccl_rpn_delete(cn);
1312     return 0;
1313 }
1314
1315 static struct client *client_create(void)
1316 {
1317     struct client *r;
1318     if (client_freelist)
1319     {
1320         r = client_freelist;
1321         client_freelist = client_freelist->next;
1322     }
1323     else
1324         r = xmalloc(sizeof(struct client));
1325     r->pquery = 0;
1326     r->database = 0;
1327     r->connection = 0;
1328     r->session = 0;
1329     r->hits = 0;
1330     r->records = 0;
1331     r->setno = 0;
1332     r->requestid = -1;
1333     r->diagnostic = 0;
1334     r->state = Client_Disconnected;
1335     r->next = 0;
1336     return r;
1337 }
1338
1339 void client_destroy(struct client *c)
1340 {
1341     struct session *se = c->session;
1342     if (c == se->clients)
1343         se->clients = c->next;
1344     else
1345     {
1346         struct client *cc;
1347         for (cc = se->clients; cc && cc->next != c; cc = cc->next)
1348             ;
1349         if (cc)
1350             cc->next = c->next;
1351     }
1352     if (c->connection)
1353         connection_release(c->connection);
1354     c->next = client_freelist;
1355     client_freelist = c;
1356 }
1357
1358 void session_set_watch(struct session *s, int what, session_watchfun fun, void *data)
1359 {
1360     s->watchlist[what].fun = fun;
1361     s->watchlist[what].data = data;
1362 }
1363
1364 void session_alert_watch(struct session *s, int what)
1365 {
1366     if (!s->watchlist[what].fun)
1367         return;
1368     (*s->watchlist[what].fun)(s->watchlist[what].data);
1369     s->watchlist[what].fun = 0;
1370     s->watchlist[what].data = 0;
1371 }
1372
1373 //callback for grep_databases
1374 static void select_targets_callback(void *context, struct session_database *db)
1375 {
1376     struct session *se = (struct session*) context;
1377     struct client *cl = client_create();
1378     cl->database = db;
1379     cl->session = se;
1380     cl->next = se->clients;
1381     se->clients = cl;
1382 }
1383
1384 // Associates a set of clients with a session;
1385 // Note: Session-databases represent databases with per-session setting overrides
1386 int select_targets(struct session *se, struct database_criterion *crit)
1387 {
1388     while (se->clients)
1389         client_destroy(se->clients);
1390
1391     return session_grep_databases(se, crit, select_targets_callback);
1392 }
1393
1394 int session_active_clients(struct session *s)
1395 {
1396     struct client *c;
1397     int res = 0;
1398
1399     for (c = s->clients; c; c = c->next)
1400         if (c->connection && (c->state == Client_Connecting ||
1401                     c->state == Client_Initializing ||
1402                     c->state == Client_Searching ||
1403                     c->state == Client_Presenting))
1404             res++;
1405
1406     return res;
1407 }
1408
1409 // parses crit1=val1,crit2=val2|val3,...
1410 static struct database_criterion *parse_filter(NMEM m, const char *buf)
1411 {
1412     struct database_criterion *res = 0;
1413     char **values;
1414     int num;
1415     int i;
1416
1417     if (!buf || !*buf)
1418         return 0;
1419     nmem_strsplit(m, ",", buf,  &values, &num);
1420     for (i = 0; i < num; i++)
1421     {
1422         char **subvalues;
1423         int subnum;
1424         int subi;
1425         struct database_criterion *new = nmem_malloc(m, sizeof(*new));
1426         char *eq = strchr(values[i], '=');
1427         if (!eq)
1428         {
1429             yaz_log(YLOG_WARN, "Missing equal-sign in filter");
1430             return 0;
1431         }
1432         *(eq++) = '\0';
1433         new->name = values[i];
1434         nmem_strsplit(m, "|", eq, &subvalues, &subnum);
1435         new->values = 0;
1436         for (subi = 0; subi < subnum; subi++)
1437         {
1438             struct database_criterion_value *newv = nmem_malloc(m, sizeof(*newv));
1439             newv->value = subvalues[subi];
1440             newv->next = new->values;
1441             new->values = newv;
1442         }
1443         new->next = res;
1444         res = new;
1445     }
1446     return res;
1447 }
1448
1449 char *search(struct session *se, char *query, char *filter)
1450 {
1451     int live_channels = 0;
1452     struct client *cl;
1453     struct database_criterion *criteria;
1454
1455     yaz_log(YLOG_DEBUG, "Search");
1456
1457     nmem_reset(se->nmem);
1458     criteria = parse_filter(se->nmem, filter);
1459     se->requestid++;
1460     live_channels = select_targets(se, criteria);
1461     if (live_channels)
1462     {
1463         int maxrecs = live_channels * global_parameters.toget;
1464         se->num_termlists = 0;
1465         se->reclist = reclist_create(se->nmem, maxrecs);
1466         // This will be initialized in send_search()
1467         se->total_records = se->total_hits = se->total_merged = 0;
1468         se->expected_maxrecs = maxrecs;
1469     }
1470     else
1471         return "NOTARGETS";
1472
1473     se->relevance = 0;
1474     for (cl = se->clients; cl; cl = cl->next)
1475         if (client_parse_query(cl, query) < 0)  // Query must parse for all targets
1476             return "QUERY";
1477     for (cl = se->clients; cl; cl = cl->next)
1478         client_prep_connection(cl);
1479
1480     return 0;
1481 }
1482
1483 // Apply a session override to a database
1484 void session_apply_setting(struct session *se, char *dbname, char *setting, char *value)
1485 {
1486     struct session_database *sdb;
1487
1488     for (sdb = se->databases; sdb; sdb = sdb->next)
1489         if (!strcmp(dbname, sdb->database->url))
1490         {
1491             struct setting *new = nmem_malloc(se->session_nmem, sizeof(*new));
1492             int offset = settings_offset(setting);
1493
1494             if (offset < 0)
1495             {
1496                 yaz_log(YLOG_WARN, "Unknown setting %s", setting);
1497                 return;
1498             }
1499             new->precedence = 0;
1500             new->target = dbname;
1501             new->name = setting;
1502             new->value = value;
1503             new->next = sdb->settings[offset];
1504             sdb->settings[offset] = new;
1505             break;
1506         }
1507     if (!sdb)
1508         yaz_log(YLOG_WARN, "Unknown database in setting override: %s", dbname);
1509 }
1510
1511 void session_init_databases_fun(void *context, struct database *db)
1512 {
1513     struct session *se = (struct session *) context;
1514     struct session_database *new = nmem_malloc(se->session_nmem, sizeof(*new));
1515     int num = settings_num();
1516     int i;
1517
1518     new->database = db;
1519     new->settings = nmem_malloc(se->session_nmem, sizeof(struct settings *) * num);
1520     for (i = 0; i < num; i++)
1521         new->settings[i] = db->settings[i];
1522     new->next = se->databases;
1523     se->databases = new;
1524 }
1525
1526 // Initialize session_database list -- this represents this session's view
1527 // of the database list -- subject to modification by the settings ws command
1528 void session_init_databases(struct session *se)
1529 {
1530     se->databases = 0;
1531     grep_databases(se, 0, session_init_databases_fun);
1532 }
1533
1534 void destroy_session(struct session *s)
1535 {
1536     yaz_log(YLOG_LOG, "Destroying session");
1537     while (s->clients)
1538         client_destroy(s->clients);
1539     nmem_destroy(s->nmem);
1540     wrbuf_destroy(s->wrbuf);
1541 }
1542
1543 struct session *new_session(NMEM nmem)
1544 {
1545     int i;
1546     struct session *session = nmem_malloc(nmem, sizeof(*session));
1547
1548     yaz_log(YLOG_DEBUG, "New Pazpar2 session");
1549
1550     session->total_hits = 0;
1551     session->total_records = 0;
1552     session->num_termlists = 0;
1553     session->reclist = 0;
1554     session->requestid = -1;
1555     session->clients = 0;
1556     session->expected_maxrecs = 0;
1557     session->session_nmem = nmem;
1558     session->nmem = nmem_create();
1559     session->wrbuf = wrbuf_alloc();
1560     session_init_databases(session);
1561     for (i = 0; i <= SESSION_WATCH_MAX; i++)
1562     {
1563         session->watchlist[i].data = 0;
1564         session->watchlist[i].fun = 0;
1565     }
1566
1567     return session;
1568 }
1569
1570 struct hitsbytarget *hitsbytarget(struct session *se, int *count)
1571 {
1572     static struct hitsbytarget res[1000]; // FIXME MM
1573     struct client *cl;
1574
1575     *count = 0;
1576     for (cl = se->clients; cl; cl = cl->next)
1577     {
1578         char *name = session_setting_oneval(cl->database, PZ_NAME);
1579
1580         res[*count].id = cl->database->database->url;
1581         res[*count].name = *name ? name : "Unknown";
1582         res[*count].hits = cl->hits;
1583         res[*count].records = cl->records;
1584         res[*count].diagnostic = cl->diagnostic;
1585         res[*count].state = client_states[cl->state];
1586         res[*count].connected  = cl->connection ? 1 : 0;
1587         (*count)++;
1588     }
1589
1590     return res;
1591 }
1592
1593 struct termlist_score **termlist(struct session *s, const char *name, int *num)
1594 {
1595     int i;
1596
1597     for (i = 0; i < s->num_termlists; i++)
1598         if (!strcmp((const char *) s->termlists[i].name, name))
1599             return termlist_highscore(s->termlists[i].termlist, num);
1600     return 0;
1601 }
1602
1603 #ifdef MISSING_HEADERS
1604 void report_nmem_stats(void)
1605 {
1606     size_t in_use, is_free;
1607
1608     nmem_get_memory_in_use(&in_use);
1609     nmem_get_memory_free(&is_free);
1610
1611     yaz_log(YLOG_LOG, "nmem stat: use=%ld free=%ld",
1612             (long) in_use, (long) is_free);
1613 }
1614 #endif
1615
1616 struct record_cluster *show_single(struct session *s, int id)
1617 {
1618     struct record_cluster *r;
1619
1620     reclist_rewind(s->reclist);
1621     while ((r = reclist_read_record(s->reclist)))
1622         if (r->recid == id)
1623             return r;
1624     return 0;
1625 }
1626
1627 struct record_cluster **show(struct session *s, struct reclist_sortparms *sp, int start,
1628         int *num, int *total, int *sumhits, NMEM nmem_show)
1629 {
1630     struct record_cluster **recs = nmem_malloc(nmem_show, *num
1631                                        * sizeof(struct record_cluster *));
1632     struct reclist_sortparms *spp;
1633     int i;
1634 #if USE_TIMING
1635     yaz_timing_t t = yaz_timing_create();
1636 #endif
1637
1638     for (spp = sp; spp; spp = spp->next)
1639         if (spp->type == Metadata_sortkey_relevance)
1640         {
1641             relevance_prepare_read(s->relevance, s->reclist);
1642             break;
1643         }
1644     reclist_sort(s->reclist, sp);
1645
1646     *total = s->reclist->num_records;
1647     *sumhits = s->total_hits;
1648
1649     for (i = 0; i < start; i++)
1650         if (!reclist_read_record(s->reclist))
1651         {
1652             *num = 0;
1653             recs = 0;
1654             break;
1655         }
1656
1657     for (i = 0; i < *num; i++)
1658     {
1659         struct record_cluster *r = reclist_read_record(s->reclist);
1660         if (!r)
1661         {
1662             *num = i;
1663             break;
1664         }
1665         recs[i] = r;
1666     }
1667 #if USE_TIMING
1668     yaz_timing_stop(t);
1669     yaz_log(YLOG_LOG, "show %6.5f %3.2f %3.2f",
1670             yaz_timing_get_real(t), yaz_timing_get_user(t),
1671             yaz_timing_get_sys(t));
1672     yaz_timing_destroy(&t);
1673 #endif
1674     return recs;
1675 }
1676
1677 void statistics(struct session *se, struct statistics *stat)
1678 {
1679     struct client *cl;
1680     int count = 0;
1681
1682     memset(stat, 0, sizeof(*stat));
1683     for (cl = se->clients; cl; cl = cl->next)
1684     {
1685         if (!cl->connection)
1686             stat->num_no_connection++;
1687         switch (cl->state)
1688         {
1689             case Client_Connecting: stat->num_connecting++; break;
1690             case Client_Initializing: stat->num_initializing++; break;
1691             case Client_Searching: stat->num_searching++; break;
1692             case Client_Presenting: stat->num_presenting++; break;
1693             case Client_Idle: stat->num_idle++; break;
1694             case Client_Failed: stat->num_failed++; break;
1695             case Client_Error: stat->num_error++; break;
1696             default: break;
1697         }
1698         count++;
1699     }
1700     stat->num_hits = se->total_hits;
1701     stat->num_records = se->total_records;
1702
1703     stat->num_clients = count;
1704 }
1705
1706 void start_http_listener(void)
1707 {
1708     char hp[128] = "";
1709     struct conf_server *ser = global_parameters.server;
1710
1711     if (*global_parameters.listener_override)
1712         strcpy(hp, global_parameters.listener_override);
1713     else
1714     {
1715         strcpy(hp, ser->host ? ser->host : "");
1716         if (ser->port)
1717         {
1718             if (*hp)
1719                 strcat(hp, ":");
1720             sprintf(hp + strlen(hp), "%d", ser->port);
1721         }
1722     }
1723     http_init(hp);
1724 }
1725
1726 void start_proxy(void)
1727 {
1728     char hp[128] = "";
1729     struct conf_server *ser = global_parameters.server;
1730
1731     if (*global_parameters.proxy_override)
1732         strcpy(hp, global_parameters.proxy_override);
1733     else if (ser->proxy_host || ser->proxy_port)
1734     {
1735         strcpy(hp, ser->proxy_host ? ser->proxy_host : "");
1736         if (ser->proxy_port)
1737         {
1738             if (*hp)
1739                 strcat(hp, ":");
1740             sprintf(hp + strlen(hp), "%d", ser->proxy_port);
1741         }
1742     }
1743     else
1744         return;
1745
1746     http_set_proxyaddr(hp, ser->myurl ? ser->myurl : "");
1747 }
1748
1749 void start_zproxy(void)
1750 {
1751     struct conf_server *ser = global_parameters.server;
1752
1753     if (*global_parameters.zproxy_override){
1754         yaz_log(YLOG_LOG, "Z39.50 proxy  %s",
1755                 global_parameters.zproxy_override);
1756         return;
1757     }
1758
1759     else if (ser->zproxy_host || ser->zproxy_port)
1760     {
1761         char hp[128] = "";
1762
1763         strcpy(hp, ser->zproxy_host ? ser->zproxy_host : "");
1764         if (ser->zproxy_port)
1765         {
1766             if (*hp)
1767                 strcat(hp, ":");
1768             else
1769                 strcat(hp, "@:");
1770
1771             sprintf(hp + strlen(hp), "%d", ser->zproxy_port);
1772         }
1773         strcpy(global_parameters.zproxy_override, hp);
1774         yaz_log(YLOG_LOG, "Z39.50 proxy  %s",
1775                 global_parameters.zproxy_override);
1776
1777     }
1778     else
1779         return;
1780 }
1781
1782 // Master list of connections we're handling events to
1783 static IOCHAN channel_list = 0;
1784 void pazpar2_add_channel(IOCHAN chan)
1785 {
1786     chan->next = channel_list;
1787     channel_list = chan;
1788 }
1789
1790 void pazpar2_event_loop()
1791 {
1792     event_loop(&channel_list);
1793 }
1794
1795 /*
1796  * Local variables:
1797  * c-basic-offset: 4
1798  * indent-tabs-mode: nil
1799  * End:
1800  * vim: shiftwidth=4 tabstop=8 expandtab
1801  */