src/client.c

   1 /* $Id: client.c,v 1.10 2007-06-15 06:55:16 adam 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 /** \file client.c
  23     \brief Z39.50 client
  24 */
  25
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <sys/time.h>
  30 #include <unistd.h>
  31 #include <sys/socket.h>
  32 #include <netdb.h>
  33 #include <signal.h>
  34 #include <ctype.h>
  35 #include <assert.h>
  36
  37 #include <yaz/marcdisp.h>
  38 #include <yaz/comstack.h>
  39 #include <yaz/tcpip.h>
  40 #include <yaz/proto.h>
  41 #include <yaz/readconf.h>
  42 #include <yaz/pquery.h>
  43 #include <yaz/otherinfo.h>
  44 #include <yaz/yaz-util.h>
  45 #include <yaz/nmem.h>
  46 #include <yaz/query-charset.h>
  47 #include <yaz/querytowrbuf.h>
  48 #include <yaz/oid_db.h>
  49
  50 #if HAVE_CONFIG_H
  51 #include "cconfig.h"
  52 #endif
  53
  54 #define USE_TIMING 0
  55 #if USE_TIMING
  56 #include <yaz/timing.h>
  57 #endif
  58
  59 #include <netinet/in.h>
  60
  61 #include "pazpar2.h"
  62
  63 #include "client.h"
  64 #include "connection.h"
  65 #include "settings.h"
  66
  67 /** \brief Represents client state for a connection to one search target */
  68 struct client {
  69     struct session_database *database;
  70     struct connection *connection;
  71     struct session *session;
  72     char *pquery; // Current search
  73     int hits;
  74     int records;
  75     int setno;
  76     int requestid;            // ID of current outstanding request
  77     int diagnostic;
  78     enum client_state state;
  79     struct show_raw *show_raw;
  80     struct client *next;     // next client in session or next in free list
  81 };
  82
  83 struct show_raw {
  84     int active; // whether this request has been sent to the server
  85     int position;
  86     char *syntax;
  87     char *esn;
  88     void (*error_handler)(void *data, const char *addinfo);
  89     void (*record_handler)(void *data, const char *buf, size_t sz);
  90     void *data;
  91 };
  92
  93 static const char *client_states[] = {
  94     "Client_Connecting",
  95     "Client_Connected",
  96     "Client_Idle",
  97     "Client_Initializing",
  98     "Client_Searching",
  99     "Client_Presenting",
 100     "Client_Error",
 101     "Client_Failed",
 102     "Client_Disconnected",
 103     "Client_Stopped"
 104 };
 105
 106 static struct client *client_freelist = 0;
 107
 108 static int send_apdu(struct client *c, Z_APDU *a)
 109 {
 110     return connection_send_apdu(client_get_connection(c), a);
 111 }
 112
 113
 114 const char *client_get_state_str(struct client *cl)
 115 {
 116     return client_states[cl->state];
 117 }
 118
 119 enum client_state client_get_state(struct client *cl)
 120 {
 121     return cl->state;
 122 }
 123
 124 void client_set_state(struct client *cl, enum client_state st)
 125 {
 126     cl->state = st;
 127 }
 128
 129 static void client_show_raw_error(struct client *cl, const char *addinfo);
 130
 131 // Close connection and set state to error
 132 void client_fatal(struct client *cl)
 133 {
 134     client_show_raw_error(cl, "client connection failure");
 135     yaz_log(YLOG_WARN, "Fatal error from %s", client_get_url(cl));
 136     connection_destroy(cl->connection);
 137     cl->state = Client_Error;
 138 }
 139
 140 struct connection *client_get_connection(struct client *cl)
 141 {
 142     return cl->connection;
 143 }
 144
 145 struct session_database *client_get_database(struct client *cl)
 146 {
 147     return cl->database;
 148 }
 149
 150 struct session *client_get_session(struct client *cl)
 151 {
 152     return cl->session;
 153 }
 154
 155 const char *client_get_pquery(struct client *cl)
 156 {
 157     return cl->pquery;
 158 }
 159
 160 void client_set_requestid(struct client *cl, int id)
 161 {
 162     cl->requestid = id;
 163 }
 164
 165 int client_show_raw(struct client *cl, int position,
 166                     const char *syntax, const char *esn,
 167                     void *data,
 168                     void (*error_handler)(void *data, const char *addinfo),
 169                     void (*record_handler)(void *data, const char *buf,
 170                                            size_t sz))
 171 {
 172     if (cl->show_raw)
 173         return -1;
 174     cl->show_raw = xmalloc(sizeof(*cl->show_raw));
 175     cl->show_raw->position = position;
 176     cl->show_raw->active = 0;
 177     cl->show_raw->data = data;
 178     cl->show_raw->error_handler = error_handler;
 179     cl->show_raw->record_handler = record_handler;
 180     if (syntax)
 181         cl->show_raw->syntax = xstrdup(syntax);
 182     else
 183         cl->show_raw->syntax = 0;
 184     if (esn)
 185         cl->show_raw->esn = xstrdup(esn);
 186     else
 187         cl->show_raw->esn = 0;
 188     client_continue(cl);
 189     return 0;
 190 }
 191
 192 static void client_show_raw_error(struct client *cl, const char *addinfo)
 193 {
 194     if (cl->show_raw)
 195     {
 196         cl->show_raw->error_handler(cl->show_raw->data, addinfo);
 197         xfree(cl->show_raw);
 198         cl->show_raw = 0;
 199     }
 200 }
 201
 202 static void client_show_raw_cancel(struct client *cl)
 203 {
 204     if (cl->show_raw)
 205     {
 206         cl->show_raw->error_handler(cl->show_raw->data, "cancel");
 207         xfree(cl->show_raw);
 208         cl->show_raw = 0;
 209     }
 210 }
 211
 212 void client_send_raw_present(struct client *cl)
 213 {
 214     Z_APDU *a = zget_APDU(global_parameters.odr_out, Z_APDU_presentRequest);
 215     int toget = 1;
 216     int start = cl->show_raw->position;
 217
 218     assert(cl->show_raw);
 219
 220     yaz_log(YLOG_LOG, "Trying to present %d record(s) from %d",
 221             toget, start);
 222
 223     a->u.presentRequest->resultSetStartPoint = &start;
 224     a->u.presentRequest->numberOfRecordsRequested = &toget;
 225
 226     if (cl->show_raw->syntax)  // syntax is optional
 227         a->u.presentRequest->preferredRecordSyntax =
 228             yaz_string_to_oid_odr(yaz_oid_std(),
 229                                   CLASS_RECSYN, cl->show_raw->syntax,
 230                                   global_parameters.odr_out);
 231     if (cl->show_raw->esn)  // element set is optional
 232     {
 233         Z_ElementSetNames *elementSetNames =
 234             odr_malloc(global_parameters.odr_out, sizeof(*elementSetNames));
 235         Z_RecordComposition *compo =
 236             odr_malloc(global_parameters.odr_out, sizeof(*compo));
 237         a->u.presentRequest->recordComposition = compo;
 238
 239         compo->which = Z_RecordComp_simple;
 240         compo->u.simple = elementSetNames;
 241
 242         elementSetNames->which = Z_ElementSetNames_generic;
 243         elementSetNames->u.generic =
 244             odr_strdup(global_parameters.odr_out, cl->show_raw->esn);
 245     }
 246     if (send_apdu(cl, a) >= 0)
 247     {
 248         cl->show_raw->active = 1;
 249         cl->state = Client_Presenting;
 250     }
 251     else
 252     {
 253         client_show_raw_error(cl, "send_apdu failed");
 254         cl->state = Client_Error;
 255     }
 256     odr_reset(global_parameters.odr_out);
 257 }
 258
 259 void client_send_present(struct client *cl)
 260 {
 261     struct session_database *sdb = client_get_database(cl);
 262     Z_APDU *a = zget_APDU(global_parameters.odr_out, Z_APDU_presentRequest);
 263     int toget;
 264     int start = cl->records + 1;
 265     char *recsyn;
 266
 267     toget = global_parameters.chunk;
 268     if (toget > global_parameters.toget - cl->records)
 269         toget = global_parameters.toget - cl->records;
 270     if (toget > cl->hits - cl->records)
 271         toget = cl->hits - cl->records;
 272
 273     yaz_log(YLOG_DEBUG, "Trying to present %d record(s) from %d",
 274             toget, start);
 275
 276     a->u.presentRequest->resultSetStartPoint = &start;
 277     a->u.presentRequest->numberOfRecordsRequested = &toget;
 278
 279     if ((recsyn = session_setting_oneval(sdb, PZ_REQUESTSYNTAX)))
 280     {
 281         a->u.presentRequest->preferredRecordSyntax =
 282             yaz_string_to_oid_odr(yaz_oid_std(),
 283                                   CLASS_RECSYN, recsyn,
 284                                   global_parameters.odr_out);
 285     }
 286
 287     if (send_apdu(cl, a) >= 0)
 288         cl->state = Client_Presenting;
 289     else
 290         cl->state = Client_Error;
 291     odr_reset(global_parameters.odr_out);
 292 }
 293
 294
 295 void client_send_search(struct client *cl)
 296 {
 297     struct session *se = client_get_session(cl);
 298     struct session_database *sdb = client_get_database(cl);
 299     Z_APDU *a = zget_APDU(global_parameters.odr_out, Z_APDU_searchRequest);
 300     int ndb;
 301     char **databaselist;
 302     Z_Query *zquery;
 303     int ssub = 0, lslb = 100000, mspn = 10;
 304     char *recsyn = 0;
 305     char *piggyback = 0;
 306     char *queryenc = 0;
 307     yaz_iconv_t iconv = 0;
 308
 309     yaz_log(YLOG_DEBUG, "Sending search to %s", sdb->database->url);
 310
 311
 312     // constructing RPN query
 313     a->u.searchRequest->query = zquery = odr_malloc(global_parameters.odr_out,
 314                                                     sizeof(Z_Query));
 315     zquery->which = Z_Query_type_1;
 316     zquery->u.type_1 = p_query_rpn(global_parameters.odr_out,
 317                                    client_get_pquery(cl));
 318
 319     // converting to target encoding
 320     if ((queryenc = session_setting_oneval(sdb, PZ_QUERYENCODING))){
 321         iconv = yaz_iconv_open(queryenc, "UTF-8");
 322         if (iconv){
 323             yaz_query_charset_convert_rpnquery(zquery->u.type_1,
 324                                                global_parameters.odr_out,
 325                                                iconv);
 326             yaz_iconv_close(iconv);
 327         } else
 328             yaz_log(YLOG_WARN, "Query encoding failed %s %s",
 329                     client_get_database(cl)->database->url, queryenc);
 330     }
 331
 332     for (ndb = 0; sdb->database->databases[ndb]; ndb++)
 333         ;
 334     databaselist = odr_malloc(global_parameters.odr_out, sizeof(char*) * ndb);
 335     for (ndb = 0; sdb->database->databases[ndb]; ndb++)
 336         databaselist[ndb] = sdb->database->databases[ndb];
 337
 338     if (!(piggyback = session_setting_oneval(sdb, PZ_PIGGYBACK))
 339         || *piggyback == '1')
 340     {
 341         if ((recsyn = session_setting_oneval(sdb, PZ_REQUESTSYNTAX)))
 342         {
 343             a->u.searchRequest->preferredRecordSyntax =
 344                 yaz_string_to_oid_odr(yaz_oid_std(),
 345                                       CLASS_RECSYN, recsyn,
 346                                       global_parameters.odr_out);
 347         }
 348         a->u.searchRequest->smallSetUpperBound = &ssub;
 349         a->u.searchRequest->largeSetLowerBound = &lslb;
 350         a->u.searchRequest->mediumSetPresentNumber = &mspn;
 351     }
 352     a->u.searchRequest->databaseNames = databaselist;
 353     a->u.searchRequest->num_databaseNames = ndb;
 354
 355
 356     {  //scope for sending and logging queries
 357         WRBUF wbquery = wrbuf_alloc();
 358         yaz_query_to_wrbuf(wbquery, a->u.searchRequest->query);
 359
 360
 361         if (send_apdu(cl, a) >= 0)
 362         {
 363             client_set_state(cl, Client_Searching);
 364             client_set_requestid(cl, se->requestid);
 365             yaz_log(YLOG_LOG, "SearchRequest %s %s %s",
 366                     client_get_database(cl)->database->url,
 367                     queryenc ? queryenc : "UTF-8",
 368                     wrbuf_cstr(wbquery));
 369         }
 370         else {
 371             client_set_state(cl, Client_Error);
 372             yaz_log(YLOG_WARN, "Failed SearchRequest %s  %s %s",
 373                     client_get_database(cl)->database->url,
 374                     queryenc ? queryenc : "UTF-8",
 375                     wrbuf_cstr(wbquery));
 376         }
 377
 378         wrbuf_destroy(wbquery);
 379     }
 380
 381     odr_reset(global_parameters.odr_out);
 382 }
 383
 384 void client_init_response(struct client *cl, Z_APDU *a)
 385 {
 386     Z_InitResponse *r = a->u.initResponse;
 387
 388     yaz_log(YLOG_DEBUG, "Init response %s", cl->database->database->url);
 389
 390     if (*r->result)
 391     {
 392         cl->state = Client_Idle;
 393     }
 394     else
 395         cl->state = Client_Failed; // FIXME need to do something to the connection
 396 }
 397
 398
 399 static void ingest_raw_records(struct client *cl, Z_Records *r)
 400 {
 401     Z_NamePlusRecordList *rlist;
 402     Z_NamePlusRecord *npr;
 403     xmlDoc *doc;
 404     xmlChar *buf_out;
 405     int len_out;
 406     if (r->which != Z_Records_DBOSD)
 407     {
 408         client_show_raw_error(cl, "non-surrogate diagnostics");
 409         return;
 410     }
 411
 412     rlist = r->u.databaseOrSurDiagnostics;
 413     if (rlist->num_records != 1 || !rlist->records || !rlist->records[0])
 414     {
 415         client_show_raw_error(cl, "no records");
 416         return;
 417     }
 418     npr = rlist->records[0];
 419     if (npr->which != Z_NamePlusRecord_databaseRecord)
 420     {
 421         client_show_raw_error(cl, "surrogate diagnostic");
 422         return;
 423     }
 424
 425     doc = record_to_xml(client_get_database(cl), npr->u.databaseRecord);
 426     if (!doc)
 427     {
 428         client_show_raw_error(cl, "unable to convert record to xml");
 429         return;
 430     }
 431
 432     xmlDocDumpMemory(doc, &buf_out, &len_out);
 433
 434     cl->show_raw->record_handler(cl->show_raw->data,
 435                                  (const char *) buf_out, len_out);
 436
 437     xmlFreeDoc(doc);
 438     xfree(cl->show_raw);
 439     cl->show_raw = 0;
 440 }
 441
 442 static void ingest_records(struct client *cl, Z_Records *r)
 443 {
 444 #if USE_TIMING
 445     yaz_timing_t t = yaz_timing_create();
 446 #endif
 447     struct record *rec;
 448     struct session *s = client_get_session(cl);
 449     Z_NamePlusRecordList *rlist;
 450     int i;
 451
 452     if (r->which != Z_Records_DBOSD)
 453         return;
 454     rlist = r->u.databaseOrSurDiagnostics;
 455     for (i = 0; i < rlist->num_records; i++)
 456     {
 457         Z_NamePlusRecord *npr = rlist->records[i];
 458
 459         cl->records++;
 460         if (npr->which != Z_NamePlusRecord_databaseRecord)
 461         {
 462             yaz_log(YLOG_WARN,
 463                     "Unexpected record type, probably diagnostic %s",
 464                     cl->database->database->url);
 465             continue;
 466         }
 467
 468         rec = ingest_record(cl, npr->u.databaseRecord, cl->records);
 469         if (!rec)
 470             continue;
 471     }
 472     if (rlist->num_records)
 473         session_alert_watch(s, SESSION_WATCH_RECORDS);
 474
 475 #if USE_TIMING
 476     yaz_timing_stop(t);
 477     yaz_log(YLOG_LOG, "ingest_records %6.5f %3.2f %3.2f",
 478             yaz_timing_get_real(t), yaz_timing_get_user(t),
 479             yaz_timing_get_sys(t));
 480     yaz_timing_destroy(&t);
 481 #endif
 482 }
 483
 484
 485 void client_search_response(struct client *cl, Z_APDU *a)
 486 {
 487     struct session *se = cl->session;
 488     Z_SearchResponse *r = a->u.searchResponse;
 489
 490     yaz_log(YLOG_DEBUG, "Search response %s (status=%d)",
 491             cl->database->database->url, *r->searchStatus);
 492
 493     if (*r->searchStatus)
 494     {
 495         cl->hits = *r->resultCount;
 496         se->total_hits += cl->hits;
 497         if (r->presentStatus && !*r->presentStatus && r->records)
 498         {
 499             yaz_log(YLOG_DEBUG, "Records in search response %s",
 500                     cl->database->database->url);
 501             ingest_records(cl, r->records);
 502         }
 503         cl->state = Client_Idle;
 504     }
 505     else
 506     {          /*"FAILED"*/
 507         cl->hits = 0;
 508         cl->state = Client_Error;
 509         if (r->records) {
 510             Z_Records *recs = r->records;
 511             if (recs->which == Z_Records_NSD)
 512             {
 513                 yaz_log(YLOG_WARN,
 514                     "Search response: Non-surrogate diagnostic %s (%d)",
 515                     cl->database->database->url,
 516                     *recs->u.nonSurrogateDiagnostic->condition);
 517                 cl->diagnostic = *recs->u.nonSurrogateDiagnostic->condition;
 518                 cl->state = Client_Error;
 519             }
 520         }
 521     }
 522 }
 523
 524 void client_present_response(struct client *cl, Z_APDU *a)
 525 {
 526     Z_PresentResponse *r = a->u.presentResponse;
 527
 528     if (r->records) {
 529         Z_Records *recs = r->records;
 530         if (recs->which == Z_Records_NSD)
 531         {
 532             yaz_log(YLOG_WARN, "Non-surrogate diagnostic %s",
 533                     cl->database->database->url);
 534             cl->diagnostic = *recs->u.nonSurrogateDiagnostic->condition;
 535             cl->state = Client_Error;
 536             client_show_raw_error(cl, "non surrogate diagnostics");
 537         }
 538     }
 539
 540     if (!*r->presentStatus && cl->state != Client_Error)
 541     {
 542         yaz_log(YLOG_DEBUG, "Good Present response %s",
 543                 cl->database->database->url);
 544
 545         // we can mix show raw and normal show ..
 546         if (cl->show_raw && cl->show_raw->active)
 547         {
 548             cl->show_raw->active = 0; // no longer active
 549             ingest_raw_records(cl, r->records);
 550         }
 551         else
 552             ingest_records(cl, r->records);
 553         cl->state = Client_Idle;
 554     }
 555     else if (*r->presentStatus)
 556     {
 557         yaz_log(YLOG_WARN, "Bad Present response %s",
 558                 cl->database->database->url);
 559         cl->state = Client_Error;
 560         client_show_raw_error(cl, "bad present response");
 561     }
 562 }
 563
 564 void client_close_response(struct client *cl, Z_APDU *a)
 565 {
 566     struct connection *co = cl->connection;
 567     /* Z_Close *r = a->u.close; */
 568
 569     yaz_log(YLOG_WARN, "Close response %s", cl->database->database->url);
 570
 571     cl->state = Client_Failed;
 572     connection_destroy(co);
 573 }
 574
 575 int client_is_our_response(struct client *cl)
 576 {
 577     struct session *se = client_get_session(cl);
 578
 579     if (cl && (cl->requestid == se->requestid ||
 580                cl->state == Client_Initializing))
 581         return 1;
 582     return 0;
 583 }
 584
 585 // Set authentication token in init if one is set for the client
 586 // TODO: Extend this to handle other schemes than open (should be simple)
 587 static void init_authentication(struct client *cl, Z_InitRequest *req)
 588 {
 589     struct session_database *sdb = client_get_database(cl);
 590     char *auth = session_setting_oneval(sdb, PZ_AUTHENTICATION);
 591
 592     if (*auth)
 593     {
 594         struct connection *co = client_get_connection(cl);
 595         struct session *se = client_get_session(cl);
 596         Z_IdAuthentication *idAuth = odr_malloc(global_parameters.odr_out,
 597                 sizeof(*idAuth));
 598         idAuth->which = Z_IdAuthentication_open;
 599         idAuth->u.open = auth;
 600         req->idAuthentication = idAuth;
 601         connection_set_authentication(co, nmem_strdup(se->session_nmem, auth));
 602     }
 603 }
 604
 605 static void init_zproxy(struct client *cl, Z_InitRequest *req)
 606 {
 607     struct session_database *sdb = client_get_database(cl);
 608     char *ztarget = sdb->database->url;
 609     //char *ztarget = sdb->url;
 610     char *zproxy = session_setting_oneval(sdb, PZ_ZPROXY);
 611
 612     if (*zproxy)
 613         yaz_oi_set_string_oid(&req->otherInfo,
 614                               global_parameters.odr_out,
 615                               yaz_oid_userinfo_proxy,
 616                               1, ztarget);
 617 }
 618
 619
 620 static void client_init_request(struct client *cl)
 621 {
 622     Z_APDU *a = zget_APDU(global_parameters.odr_out, Z_APDU_initRequest);
 623
 624     a->u.initRequest->implementationId = global_parameters.implementationId;
 625     a->u.initRequest->implementationName = global_parameters.implementationName;
 626     a->u.initRequest->implementationVersion =
 627         global_parameters.implementationVersion;
 628     ODR_MASK_SET(a->u.initRequest->options, Z_Options_search);
 629     ODR_MASK_SET(a->u.initRequest->options, Z_Options_present);
 630     ODR_MASK_SET(a->u.initRequest->options, Z_Options_namedResultSets);
 631
 632     ODR_MASK_SET(a->u.initRequest->protocolVersion, Z_ProtocolVersion_1);
 633     ODR_MASK_SET(a->u.initRequest->protocolVersion, Z_ProtocolVersion_2);
 634     ODR_MASK_SET(a->u.initRequest->protocolVersion, Z_ProtocolVersion_3);
 635
 636     init_authentication(cl, a->u.initRequest);
 637     init_zproxy(cl, a->u.initRequest);
 638
 639     if (send_apdu(cl, a) >= 0)
 640         client_set_state(cl, Client_Initializing);
 641     else
 642         client_set_state(cl, Client_Error);
 643     odr_reset(global_parameters.odr_out);
 644 }
 645
 646 void client_continue(struct client *cl)
 647 {
 648     if (cl->state == Client_Connected) {
 649         client_init_request(cl);
 650     }
 651
 652     if (cl->state == Client_Idle)
 653     {
 654         struct session *se = client_get_session(cl);
 655         if (cl->requestid != se->requestid && cl->pquery) {
 656             // we'll have to abort this because result set is to be deleted
 657             client_show_raw_cancel(cl);
 658             client_send_search(cl);
 659         }
 660         else if (cl->show_raw)
 661         {
 662             client_send_raw_present(cl);
 663         }
 664         else if (cl->hits > 0 && cl->records < global_parameters.toget &&
 665             cl->records < cl->hits) {
 666             client_send_present(cl);
 667         }
 668     }
 669 }
 670
 671 struct client *client_create(void)
 672 {
 673     struct client *r;
 674     if (client_freelist)
 675     {
 676         r = client_freelist;
 677         client_freelist = client_freelist->next;
 678     }
 679     else
 680         r = xmalloc(sizeof(struct client));
 681     r->pquery = 0;
 682     r->database = 0;
 683     r->connection = 0;
 684     r->session = 0;
 685     r->hits = 0;
 686     r->records = 0;
 687     r->setno = 0;
 688     r->requestid = -1;
 689     r->diagnostic = 0;
 690     r->state = Client_Disconnected;
 691     r->show_raw = 0;
 692     r->next = 0;
 693     return r;
 694 }
 695
 696 void client_destroy(struct client *c)
 697 {
 698     struct session *se = c->session;
 699     if (c == se->clients)
 700         se->clients = c->next;
 701     else
 702     {
 703         struct client *cc;
 704         for (cc = se->clients; cc && cc->next != c; cc = cc->next)
 705             ;
 706         if (cc)
 707             cc->next = c->next;
 708     }
 709     if (c->connection)
 710         connection_release(c->connection);
 711     c->next = client_freelist;
 712     client_freelist = c;
 713 }
 714
 715 void client_set_connection(struct client *cl, struct connection *con)
 716 {
 717     cl->connection = con;
 718 }
 719
 720 void client_disconnect(struct client *cl)
 721 {
 722     if (cl->state != Client_Idle)
 723         cl->state = Client_Disconnected;
 724     client_set_connection(cl, 0);
 725 }
 726
 727 // Extract terms from query into null-terminated termlist
 728 static void extract_terms(NMEM nmem, struct ccl_rpn_node *query, char **termlist)
 729 {
 730     int num = 0;
 731
 732     pull_terms(nmem, query, termlist, &num);
 733     termlist[num] = 0;
 734 }
 735
 736 // Initialize CCL map for a target
 737 static CCL_bibset prepare_cclmap(struct client *cl)
 738 {
 739     struct session_database *sdb = client_get_database(cl);
 740     struct setting *s;
 741     CCL_bibset res;
 742
 743     if (!sdb->settings)
 744         return 0;
 745     res = ccl_qual_mk();
 746     for (s = sdb->settings[PZ_CCLMAP]; s; s = s->next)
 747     {
 748         char *p = strchr(s->name + 3, ':');
 749         if (!p)
 750         {
 751             yaz_log(YLOG_WARN, "Malformed cclmap name: %s", s->name);
 752             ccl_qual_rm(&res);
 753             return 0;
 754         }
 755         p++;
 756         ccl_qual_fitem(res, s->value, p);
 757     }
 758     return res;
 759 }
 760
 761 // Parse the query given the settings specific to this client
 762 int client_parse_query(struct client *cl, const char *query)
 763 {
 764     struct session *se = client_get_session(cl);
 765     struct ccl_rpn_node *cn;
 766     int cerror, cpos;
 767     CCL_bibset ccl_map = prepare_cclmap(cl);
 768
 769     if (!ccl_map)
 770         return -1;
 771     cn = ccl_find_str(ccl_map, query, &cerror, &cpos);
 772     ccl_qual_rm(&ccl_map);
 773     if (!cn)
 774     {
 775         cl->state = Client_Error;
 776         yaz_log(YLOG_WARN, "Failed to parse query for %s",
 777                          client_get_database(cl)->database->url);
 778         return -1;
 779     }
 780     wrbuf_rewind(se->wrbuf);
 781     ccl_pquery(se->wrbuf, cn);
 782     xfree(cl->pquery);
 783     cl->pquery = xstrdup(wrbuf_cstr(se->wrbuf));
 784
 785     if (!se->relevance)
 786     {
 787         // Initialize relevance structure with query terms
 788         char *p[512];
 789         extract_terms(se->nmem, cn, p);
 790         se->relevance = relevance_create(client_get_database(cl)->pct,
 791                                          se->nmem, (const char **) p,
 792                                          se->expected_maxrecs);
 793     }
 794
 795     ccl_rpn_delete(cn);
 796     return 0;
 797 }
 798
 799 void client_set_session(struct client *cl, struct session *se)
 800 {
 801     cl->session = se;
 802     cl->next = se->clients;
 803     se->clients = cl;
 804 }
 805
 806 int client_is_active(struct client *cl)
 807 {
 808     if (cl->connection && (cl->state == Client_Connecting ||
 809                            cl->state == Client_Initializing ||
 810                            cl->state == Client_Searching ||
 811                            cl->state == Client_Presenting))
 812         return 1;
 813     return 0;
 814 }
 815
 816 struct client *client_next_in_session(struct client *cl)
 817 {
 818     if (cl)
 819         return cl->next;
 820     return 0;
 821
 822 }
 823
 824 int client_get_hits(struct client *cl)
 825 {
 826     return cl->hits;
 827 }
 828
 829 int client_get_num_records(struct client *cl)
 830 {
 831     return cl->records;
 832 }
 833
 834 int client_get_diagnostic(struct client *cl)
 835 {
 836     return cl->diagnostic;
 837 }
 838
 839 void client_set_database(struct client *cl, struct session_database *db)
 840 {
 841     cl->database = db;
 842 }
 843
 844 struct host *client_get_host(struct client *cl)
 845 {
 846     return client_get_database(cl)->database->host;
 847 }
 848
 849 const char *client_get_url(struct client *cl)
 850 {
 851     return client_get_database(cl)->database->url;
 852 }
 853
 854 /*
 855  * Local variables:
 856  * c-basic-offset: 4
 857  * indent-tabs-mode: nil
 858  * End:
 859  * vim: shiftwidth=4 tabstop=8 expandtab
 860  */