src/yaz-proxy.cpp

   1 /*
   2  * Copyright (c) 1998-2003, Index Data.
   3  * See the file LICENSE for details.
   4  *
   5  * $Id: yaz-proxy.cpp,v 1.62 2003-10-16 16:10:43 adam Exp $
   6  */
   7
   8 #include <assert.h>
   9 #include <time.h>
  10
  11 #include <yaz/marcdisp.h>
  12 #include <yaz/yaz-iconv.h>
  13 #include <yaz/log.h>
  14 #include <yaz/diagbib1.h>
  15 #include <yaz++/proxy.h>
  16
  17 static const char *apdu_name(Z_APDU *apdu)
  18 {
  19     switch (apdu->which)
  20     {
  21     case Z_APDU_initRequest:
  22         return "initRequest";
  23     case Z_APDU_initResponse:
  24         return "initResponse";
  25     case Z_APDU_searchRequest:
  26         return "searchRequest";
  27     case Z_APDU_searchResponse:
  28         return "searchResponse";
  29     case Z_APDU_presentRequest:
  30         return "presentRequest";
  31     case Z_APDU_presentResponse:
  32         return "presentResponse";
  33     case Z_APDU_deleteResultSetRequest:
  34         return "deleteResultSetRequest";
  35     case Z_APDU_deleteResultSetResponse:
  36         return "deleteResultSetResponse";
  37     case Z_APDU_scanRequest:
  38         return "scanRequest";
  39     case Z_APDU_scanResponse:
  40         return "scanResponse";
  41     case Z_APDU_sortRequest:
  42         return "sortRequest";
  43     case Z_APDU_sortResponse:
  44         return "sortResponse";
  45     case Z_APDU_extendedServicesRequest:
  46         return "extendedServicesRequest";
  47     case Z_APDU_extendedServicesResponse:
  48         return "extendedServicesResponse";
  49     case Z_APDU_close:
  50         return "close";
  51     }
  52     return "other";
  53 }
  54
  55 Yaz_Proxy::Yaz_Proxy(IYaz_PDU_Observable *the_PDU_Observable,
  56                      Yaz_Proxy *parent) :
  57     Yaz_Z_Assoc(the_PDU_Observable), m_bw_stat(60), m_pdu_stat(60)
  58 {
  59     m_PDU_Observable = the_PDU_Observable;
  60     m_client = 0;
  61     m_parent = parent;
  62     m_clientPool = 0;
  63     m_seqno = 1;
  64     m_keepalive_limit_bw = 500000;
  65     m_keepalive_limit_pdu = 1000;
  66     m_proxyTarget = 0;
  67     m_default_target = 0;
  68     m_proxy_authentication = 0;
  69     m_max_clients = 150;
  70     m_log_mask = 0;
  71     m_seed = time(0);
  72     m_client_idletime = 600;
  73     m_target_idletime = 600;
  74     m_optimize = xstrdup ("1");
  75     strcpy(m_session_str, "0");
  76     m_session_no=0;
  77     m_bytes_sent = m_bytes_recv = 0;
  78     m_bw_hold_PDU = 0;
  79     m_bw_max = 0;
  80     m_pdu_max = 0;
  81     m_max_record_retrieve = 0;
  82     m_reconfig_flag = 0;
  83     m_config_fname = 0;
  84     m_request_no = 0;
  85     m_invalid_session = 0;
  86     m_config = 0;
  87     m_marcxml_flag = 0;
  88 }
  89
  90 Yaz_Proxy::~Yaz_Proxy()
  91 {
  92     yaz_log(LOG_LOG, "%sClosed %d/%d sent/recv bytes total", m_session_str,
  93             m_bytes_sent, m_bytes_recv);
  94     xfree (m_proxyTarget);
  95     xfree (m_default_target);
  96     xfree (m_proxy_authentication);
  97     xfree (m_optimize);
  98     delete m_config;
  99 }
 100
 101 int Yaz_Proxy::set_config(const char *config)
 102 {
 103     delete m_config;
 104     m_config = new Yaz_ProxyConfig();
 105     xfree(m_config_fname);
 106     m_config_fname = xstrdup(config);
 107     int r = m_config->read_xml(config);
 108     if (!r)
 109         m_config->get_generic_info(&m_log_mask, &m_max_clients);
 110     return r;
 111 }
 112
 113 void Yaz_Proxy::set_default_target(const char *target)
 114 {
 115     xfree (m_default_target);
 116     m_default_target = 0;
 117     if (target)
 118         m_default_target = (char *) xstrdup (target);
 119 }
 120
 121 void Yaz_Proxy::set_proxy_authentication (const char *auth)
 122 {
 123     xfree (m_proxy_authentication);
 124     m_proxy_authentication = 0;
 125     if (auth)
 126         m_proxy_authentication = (char *) xstrdup (auth);
 127 }
 128
 129 Yaz_ProxyConfig *Yaz_Proxy::check_reconfigure()
 130 {
 131     if (m_parent)
 132         return m_parent->check_reconfigure();
 133
 134     Yaz_ProxyConfig *cfg = m_config;
 135     if (m_reconfig_flag)
 136     {
 137         yaz_log(LOG_LOG, "reconfigure");
 138         yaz_log_reopen();
 139         if (m_config_fname && cfg)
 140         {
 141             yaz_log(LOG_LOG, "reconfigure config %s", m_config_fname);
 142             int r = cfg->read_xml(m_config_fname);
 143             if (r)
 144                 yaz_log(LOG_WARN, "reconfigure failed");
 145             else
 146             {
 147                 m_log_mask = 0;
 148                 cfg->get_generic_info(&m_log_mask, &m_max_clients);
 149             }
 150         }
 151         else
 152             yaz_log(LOG_LOG, "reconfigure");
 153         m_reconfig_flag = 0;
 154     }
 155     return cfg;
 156 }
 157
 158 IYaz_PDU_Observer *Yaz_Proxy::sessionNotify(IYaz_PDU_Observable
 159                                             *the_PDU_Observable, int fd)
 160 {
 161     check_reconfigure();
 162     Yaz_Proxy *new_proxy = new Yaz_Proxy(the_PDU_Observable, this);
 163     new_proxy->m_config = 0;
 164     new_proxy->m_config_fname = 0;
 165     new_proxy->timeout(m_client_idletime);
 166     new_proxy->m_target_idletime = m_target_idletime;
 167     new_proxy->set_default_target(m_default_target);
 168     new_proxy->m_max_clients = m_max_clients;
 169     new_proxy->m_log_mask = m_log_mask;
 170     new_proxy->set_APDU_log(get_APDU_log());
 171     if (m_log_mask & PROXY_LOG_APDU_CLIENT)
 172         new_proxy->set_APDU_yazlog(1);
 173     else
 174         new_proxy->set_APDU_yazlog(0);
 175     new_proxy->set_proxy_authentication(m_proxy_authentication);
 176     sprintf(new_proxy->m_session_str, "%ld:%d ", (long) time(0), m_session_no);
 177     m_session_no++;
 178     yaz_log (LOG_LOG, "%sNew session %s", new_proxy->m_session_str,
 179              the_PDU_Observable->getpeername());
 180     return new_proxy;
 181 }
 182
 183 char *Yaz_Proxy::get_cookie(Z_OtherInformation **otherInfo)
 184 {
 185     int oid[OID_SIZE];
 186     Z_OtherInformationUnit *oi;
 187     struct oident ent;
 188     ent.proto = PROTO_Z3950;
 189     ent.oclass = CLASS_USERINFO;
 190     ent.value = (oid_value) VAL_COOKIE;
 191     assert (oid_ent_to_oid (&ent, oid));
 192
 193     if (oid_ent_to_oid (&ent, oid) &&
 194         (oi = update_otherInformation(otherInfo, 0, oid, 1, 1)) &&
 195         oi->which == Z_OtherInfo_characterInfo)
 196         return oi->information.characterInfo;
 197     return 0;
 198 }
 199
 200 char *Yaz_Proxy::get_proxy(Z_OtherInformation **otherInfo)
 201 {
 202     int oid[OID_SIZE];
 203     Z_OtherInformationUnit *oi;
 204     struct oident ent;
 205     ent.proto = PROTO_Z3950;
 206     ent.oclass = CLASS_USERINFO;
 207     ent.value = (oid_value) VAL_PROXY;
 208     if (oid_ent_to_oid (&ent, oid) &&
 209         (oi = update_otherInformation(otherInfo, 0, oid, 1, 1)) &&
 210         oi->which == Z_OtherInfo_characterInfo)
 211         return oi->information.characterInfo;
 212     return 0;
 213 }
 214
 215 const char *Yaz_Proxy::load_balance(const char **url)
 216 {
 217     int zurl_in_use[MAX_ZURL_PLEX];
 218     Yaz_ProxyClient *c;
 219     int i;
 220
 221     for (i = 0; i<MAX_ZURL_PLEX; i++)
 222         zurl_in_use[i] = 0;
 223     for (c = m_parent->m_clientPool; c; c = c->m_next)
 224     {
 225         for (i = 0; url[i]; i++)
 226             if (!strcmp(url[i], c->get_hostname()))
 227                 zurl_in_use[i]++;
 228     }
 229     int min = 100000;
 230     const char *ret = 0;
 231     for (i = 0; url[i]; i++)
 232     {
 233         yaz_log(LOG_DEBUG, "%szurl=%s use=%d",
 234                 m_session_str, url[i], zurl_in_use[i]);
 235         if (min > zurl_in_use[i])
 236         {
 237             ret = url[i];
 238             min = zurl_in_use[i];
 239         }
 240     }
 241     return ret;
 242 }
 243
 244 Yaz_ProxyClient *Yaz_Proxy::get_client(Z_APDU *apdu)
 245 {
 246     assert (m_parent);
 247     Yaz_Proxy *parent = m_parent;
 248     Z_OtherInformation **oi;
 249     Yaz_ProxyClient *c = m_client;
 250
 251     get_otherInfoAPDU(apdu, &oi);
 252     char *cookie = get_cookie(oi);
 253
 254     if (!m_proxyTarget)
 255     {
 256         const char *url[MAX_ZURL_PLEX];
 257         const char *proxy_host = get_proxy(oi);
 258         Yaz_ProxyConfig *cfg = check_reconfigure();
 259         if (proxy_host)
 260         {
 261             xfree(m_default_target);
 262             m_default_target = xstrdup(proxy_host);
 263             proxy_host = m_default_target;
 264         }
 265         int client_idletime = -1;
 266         url[0] = m_default_target;
 267         url[1] = 0;
 268         if (cfg)
 269         {
 270             int pre_init = 0;
 271             cfg->get_target_info(proxy_host, url, &m_bw_max,
 272                                  &m_pdu_max, &m_max_record_retrieve,
 273                                  &m_target_idletime, &client_idletime,
 274                                  &parent->m_max_clients,
 275                                  &m_keepalive_limit_bw,
 276                                  &m_keepalive_limit_pdu,
 277                                  &pre_init);
 278         }
 279         if (client_idletime != -1)
 280         {
 281             m_client_idletime = client_idletime;
 282             timeout(m_client_idletime);
 283         }
 284         if (!url[0])
 285         {
 286             yaz_log(LOG_LOG, "%sNo default target", m_session_str);
 287             return 0;
 288         }
 289         // we don't handle multiplexing for cookie session, so we just
 290         // pick the first one in this case (anonymous users will be able
 291         // to use any backend)
 292         if (cookie && *cookie)
 293             m_proxyTarget = (char*) xstrdup(url[0]);
 294         else
 295             m_proxyTarget = (char*) xstrdup(load_balance(url));
 296     }
 297     if (cookie && *cookie)
 298     {   // search in sessions with a cookie
 299         for (c = parent->m_clientPool; c; c = c->m_next)
 300         {
 301             assert (c->m_prev);
 302             assert (*c->m_prev == c);
 303             if (c->m_cookie && !strcmp(cookie,c->m_cookie) &&
 304                 !strcmp(m_proxyTarget, c->get_hostname()))
 305             {
 306                 // Found it in cache
 307                 // The following handles "cancel"
 308                 // If connection is busy (waiting for PDU) and
 309                 // we have an initRequest we can safely do re-open
 310                 if (c->m_waiting && apdu->which == Z_APDU_initRequest)
 311                 {
 312                     yaz_log (LOG_LOG, "%s REOPEN target=%s", m_session_str,
 313                              c->get_hostname());
 314                     c->close();
 315                     c->m_init_flag = 0;
 316
 317                     c->m_last_ok = 0;
 318                     c->m_cache.clear();
 319                     c->m_last_resultCount = 0;
 320                     c->m_sr_transform = 0;
 321                     c->m_waiting = 0;
 322                     c->m_resultSetStartPoint = 0;
 323                     c->m_target_idletime = m_target_idletime;
 324                     if (c->client(m_proxyTarget))
 325                     {
 326                         delete c;
 327                         return 0;
 328                     }
 329                     c->timeout(30);
 330                 }
 331                 c->m_seqno = parent->m_seqno;
 332                 if (c->m_server && c->m_server != this)
 333                     c->m_server->m_client = 0;
 334                 c->m_server = this;
 335                 (parent->m_seqno)++;
 336                 yaz_log (LOG_DEBUG, "get_client 1 %p %p", this, c);
 337                 return c;
 338             }
 339         }
 340     }
 341     else if (!c)
 342     {
 343         // don't have a client session yet. Search in session w/o cookie
 344         for (c = parent->m_clientPool; c; c = c->m_next)
 345         {
 346             assert (c->m_prev);
 347             assert (*c->m_prev == c);
 348             if (c->m_server == 0 && c->m_cookie == 0 &&
 349                 c->m_waiting == 0 &&
 350                 !strcmp(m_proxyTarget, c->get_hostname()))
 351             {
 352                 // found it in cache
 353                 yaz_log (LOG_LOG, "%sREUSE %d %d %s",
 354                          m_session_str,
 355                          c->m_seqno, parent->m_seqno, c->get_hostname());
 356
 357                 c->m_seqno = parent->m_seqno;
 358                 assert(c->m_server == 0);
 359                 c->m_server = this;
 360
 361                 if (parent->m_log_mask & PROXY_LOG_APDU_SERVER)
 362                     c->set_APDU_yazlog(1);
 363                 else
 364                     c->set_APDU_yazlog(0);
 365
 366                 (parent->m_seqno)++;
 367
 368                 parent->pre_init();
 369
 370                 return c;
 371             }
 372         }
 373     }
 374     if (!m_client)
 375     {
 376         if (apdu->which != Z_APDU_initRequest)
 377         {
 378             yaz_log (LOG_LOG, "no first INIT!");
 379             return 0;
 380         }
 381         Z_InitRequest *initRequest = apdu->u.initRequest;
 382
 383         if (!initRequest->idAuthentication)
 384         {
 385             if (m_proxy_authentication)
 386             {
 387                 initRequest->idAuthentication =
 388                     (Z_IdAuthentication *)
 389                     odr_malloc (odr_encode(),
 390                                 sizeof(*initRequest->idAuthentication));
 391                 initRequest->idAuthentication->which =
 392                     Z_IdAuthentication_open;
 393                 initRequest->idAuthentication->u.open =
 394                     odr_strdup (odr_encode(), m_proxy_authentication);
 395             }
 396         }
 397
 398         // go through list of clients - and find the lowest/oldest one.
 399         Yaz_ProxyClient *c_min = 0;
 400         int min_seq = -1;
 401         int no_of_clients = 0;
 402         if (parent->m_clientPool)
 403             yaz_log (LOG_DEBUG, "Existing sessions");
 404         for (c = parent->m_clientPool; c; c = c->m_next)
 405         {
 406             yaz_log (LOG_DEBUG, " Session %-3d wait=%d %s cookie=%s", c->m_seqno,
 407                                c->m_waiting, c->get_hostname(),
 408                                c->m_cookie ? c->m_cookie : "");
 409             no_of_clients++;
 410             if (min_seq < 0 || c->m_seqno < min_seq)
 411             {
 412                 min_seq = c->m_seqno;
 413                 c_min = c;
 414             }
 415         }
 416         if (no_of_clients >= parent->m_max_clients)
 417         {
 418             c = c_min;
 419             if (c->m_waiting || strcmp(m_proxyTarget, c->get_hostname()))
 420             {
 421                 yaz_log (LOG_LOG, "%sMAXCLIENTS Destroy %d",
 422                          m_session_str, c->m_seqno);
 423                 if (c->m_server && c->m_server != this)
 424                     delete c->m_server;
 425                 c->m_server = 0;
 426             }
 427             else
 428             {
 429                 yaz_log (LOG_LOG, "%sMAXCLIENTS Reuse %d %d %s",
 430                          m_session_str,
 431                          c->m_seqno, parent->m_seqno, c->get_hostname());
 432                 xfree (c->m_cookie);
 433                 c->m_cookie = 0;
 434                 if (cookie)
 435                     c->m_cookie = xstrdup(cookie);
 436                 c->m_seqno = parent->m_seqno;
 437                 if (c->m_server && c->m_server != this)
 438                 {
 439                     c->m_server->m_client = 0;
 440                     delete c->m_server;
 441                 }
 442                 (parent->m_seqno)++;
 443                 c->m_target_idletime = m_target_idletime;
 444                 c->timeout(m_target_idletime);
 445
 446                 if (parent->m_log_mask & PROXY_LOG_APDU_SERVER)
 447                     c->set_APDU_yazlog(1);
 448                 else
 449                     c->set_APDU_yazlog(0);
 450
 451                 return c;
 452             }
 453         }
 454         else
 455         {
 456             yaz_log (LOG_LOG, "%sNEW %d %s",
 457                      m_session_str, parent->m_seqno, m_proxyTarget);
 458             c = new Yaz_ProxyClient(m_PDU_Observable->clone(), parent);
 459             c->m_next = parent->m_clientPool;
 460             if (c->m_next)
 461                 c->m_next->m_prev = &c->m_next;
 462             parent->m_clientPool = c;
 463             c->m_prev = &parent->m_clientPool;
 464         }
 465
 466         xfree (c->m_cookie);
 467         c->m_cookie = 0;
 468         if (cookie)
 469             c->m_cookie = xstrdup(cookie);
 470
 471         c->m_seqno = parent->m_seqno;
 472         c->m_init_flag = 0;
 473         c->m_last_resultCount = 0;
 474         c->m_last_ok = 0;
 475         c->m_cache.clear();
 476         c->m_sr_transform = 0;
 477         c->m_waiting = 0;
 478         c->m_resultSetStartPoint = 0;
 479         (parent->m_seqno)++;
 480         if (c->client(m_proxyTarget))
 481         {
 482             delete c;
 483             return 0;
 484         }
 485         c->m_target_idletime = m_target_idletime;
 486         c->timeout(30);
 487
 488         if (parent->m_log_mask & PROXY_LOG_APDU_SERVER)
 489             c->set_APDU_yazlog(1);
 490         else
 491             c->set_APDU_yazlog(0);
 492     }
 493     yaz_log (LOG_DEBUG, "get_client 3 %p %p", this, c);
 494     return c;
 495 }
 496
 497 void Yaz_Proxy::display_diagrecs(Z_DiagRec **pp, int num)
 498 {
 499     int i;
 500     for (i = 0; i<num; i++)
 501     {
 502         oident *ent;
 503         Z_DefaultDiagFormat *r;
 504         Z_DiagRec *p = pp[i];
 505         if (p->which != Z_DiagRec_defaultFormat)
 506         {
 507             yaz_log(LOG_LOG, "%sError no diagnostics", m_session_str);
 508             return;
 509         }
 510         else
 511             r = p->u.defaultFormat;
 512         if (!(ent = oid_getentbyoid(r->diagnosticSetId)) ||
 513             ent->oclass != CLASS_DIAGSET || ent->value != VAL_BIB1)
 514             yaz_log(LOG_LOG, "%sError unknown diagnostic set", m_session_str);
 515         switch (r->which)
 516         {
 517         case Z_DefaultDiagFormat_v2Addinfo:
 518             yaz_log(LOG_LOG, "%sError %d %s:%s",
 519                     m_session_str,
 520                     *r->condition, diagbib1_str(*r->condition),
 521                     r->u.v2Addinfo);
 522             break;
 523         case Z_DefaultDiagFormat_v3Addinfo:
 524             yaz_log(LOG_LOG, "%sError %d %s:%s",
 525                     m_session_str,
 526                     *r->condition, diagbib1_str(*r->condition),
 527                     r->u.v3Addinfo);
 528             break;
 529         }
 530     }
 531 }
 532
 533 void Yaz_Proxy::convert_to_marcxml(Z_NamePlusRecordList *p)
 534 {
 535     int i;
 536
 537     yaz_marc_t mt = yaz_marc_create();
 538     yaz_marc_xml(mt, YAZ_MARC_MARCXML);
 539     for (i = 0; i < p->num_records; i++)
 540     {
 541         Z_NamePlusRecord *npr = p->records[i];
 542         if (npr->which == Z_NamePlusRecord_databaseRecord)
 543         {
 544             Z_External *r = npr->u.databaseRecord;
 545             if (r->which == Z_External_octet)
 546             {
 547                 int rlen;
 548                 char *result;
 549                 if (yaz_marc_decode_buf(mt, (char*) r->u.octet_aligned->buf,
 550                                         r->u.octet_aligned->len,
 551                                         &result, &rlen))
 552                 {
 553                     yaz_iconv_t cd = yaz_iconv_open("UTF-8", "MARC-8");
 554                     WRBUF wrbuf = wrbuf_alloc();
 555
 556                     char outbuf[120];
 557                     size_t inbytesleft = rlen;
 558                     const char *inp = result;
 559                     while (cd && inbytesleft)
 560                     {
 561                         size_t outbytesleft = sizeof(outbuf);
 562                         char *outp = outbuf;
 563                         size_t r;
 564
 565                         r = yaz_iconv (cd, (char**) &inp,
 566                                        &inbytesleft,
 567                                        &outp, &outbytesleft);
 568                         if (r == (size_t) (-1))
 569                         {
 570                             int e = yaz_iconv_error(cd);
 571                             if (e != YAZ_ICONV_E2BIG)
 572                             {
 573                                 yaz_log(LOG_WARN, "conversion failure");
 574                                 break;
 575                             }
 576                         }
 577                         wrbuf_write(wrbuf, outbuf, outp - outbuf);
 578                     }
 579                     if (cd)
 580                         yaz_iconv_close(cd);
 581
 582                     npr->u.databaseRecord = z_ext_record(odr_encode(),
 583                                                          VAL_TEXT_XML,
 584                                                          wrbuf_buf(wrbuf),
 585                                                          wrbuf_len(wrbuf));
 586                     wrbuf_free(wrbuf, 1);
 587                 }
 588             }
 589         }
 590     }
 591     yaz_marc_destroy(mt);
 592 }
 593
 594 int Yaz_Proxy::send_to_client(Z_APDU *apdu)
 595 {
 596     int len = 0;
 597     if (apdu->which == Z_APDU_searchResponse)
 598     {
 599         Z_SearchResponse *sr = apdu->u.searchResponse;
 600         Z_Records *p = sr->records;
 601         if (p && p->which == Z_Records_NSD)
 602         {
 603             Z_DiagRec dr, *dr_p = &dr;
 604             dr.which = Z_DiagRec_defaultFormat;
 605             dr.u.defaultFormat = p->u.nonSurrogateDiagnostic;
 606
 607             display_diagrecs(&dr_p, 1);
 608         }
 609         else
 610         {
 611             if (m_marcxml_flag && p && p->which == Z_Records_DBOSD)
 612                 convert_to_marcxml(p->u.databaseOrSurDiagnostics);
 613             if (sr->resultCount)
 614             {
 615                 yaz_log(LOG_LOG, "%s%d hits", m_session_str,
 616                         *sr->resultCount);
 617                 if (*sr->resultCount < 0)
 618                     m_invalid_session = 1;
 619             }
 620         }
 621     }
 622     else if (apdu->which == Z_APDU_presentResponse)
 623     {
 624         Z_PresentResponse *sr = apdu->u.presentResponse;
 625         Z_Records *p = sr->records;
 626         if (p && p->which == Z_Records_NSD)
 627         {
 628             Z_DiagRec dr, *dr_p = &dr;
 629             dr.which = Z_DiagRec_defaultFormat;
 630             dr.u.defaultFormat = p->u.nonSurrogateDiagnostic;
 631
 632             display_diagrecs(&dr_p, 1);
 633         }
 634         if (m_marcxml_flag && p && p->which == Z_Records_DBOSD)
 635             convert_to_marcxml(p->u.databaseOrSurDiagnostics);
 636     }
 637     int r = send_Z_PDU(apdu, &len);
 638     if (m_log_mask & PROXY_LOG_APDU_CLIENT)
 639         yaz_log (LOG_DEBUG, "%sSending %s to client %d bytes", m_session_str,
 640                  apdu_name(apdu), len);
 641     m_bytes_sent += len;
 642     m_bw_stat.add_bytes(len);
 643     return r;
 644 }
 645
 646 int Yaz_ProxyClient::send_to_target(Z_APDU *apdu)
 647 {
 648     int len = 0;
 649     int r = send_Z_PDU(apdu, &len);
 650     if (m_root->get_log_mask() & PROXY_LOG_REQ_SERVER)
 651         yaz_log (LOG_LOG, "%sSending %s to %s %d bytes",
 652                  get_session_str(),
 653                  apdu_name(apdu), get_hostname(), len);
 654     m_bytes_sent += len;
 655     return r;
 656 }
 657
 658 Z_APDU *Yaz_Proxy::result_set_optimize(Z_APDU *apdu)
 659 {
 660     if (apdu->which == Z_APDU_presentRequest)
 661     {
 662         Z_PresentRequest *pr = apdu->u.presentRequest;
 663         Z_NamePlusRecordList *npr;
 664         int toget = *pr->numberOfRecordsRequested;
 665         int start = *pr->resultSetStartPoint;
 666
 667         yaz_log(LOG_LOG, "%sPresent %s %d+%d", m_session_str,
 668                 pr->resultSetId, start, toget);
 669
 670         if (*m_parent->m_optimize == '0')
 671             return apdu;
 672
 673         if (!m_client->m_last_resultSetId)
 674         {
 675             Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentResponse);
 676             new_apdu->u.presentResponse->records =
 677                 create_nonSurrogateDiagnostics(odr_encode(), 30,
 678                                                pr->resultSetId);
 679             send_to_client(new_apdu);
 680             return 0;
 681         }
 682         if (!strcmp(m_client->m_last_resultSetId, pr->resultSetId))
 683         {
 684             if (start+toget-1 > m_client->m_last_resultCount)
 685             {
 686                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentResponse);
 687                 new_apdu->u.presentResponse->records =
 688                     create_nonSurrogateDiagnostics(odr_encode(), 13, 0);
 689                 send_to_client(new_apdu);
 690                 return 0;
 691             }
 692             if (m_client->m_cache.lookup (odr_encode(), &npr, start, toget,
 693                                           pr->preferredRecordSyntax,
 694                                           pr->recordComposition))
 695             {
 696                 yaz_log (LOG_LOG, "%sReturned cached records for present request",
 697                          m_session_str);
 698                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentResponse);
 699                 new_apdu->u.presentResponse->referenceId = pr->referenceId;
 700
 701                 new_apdu->u.presentResponse->numberOfRecordsReturned
 702                     = odr_intdup(odr_encode(), toget);
 703
 704                 new_apdu->u.presentResponse->records = (Z_Records*)
 705                     odr_malloc(odr_encode(), sizeof(Z_Records));
 706                 new_apdu->u.presentResponse->records->which = Z_Records_DBOSD;
 707                 new_apdu->u.presentResponse->records->u.databaseOrSurDiagnostics = npr;
 708                 new_apdu->u.presentResponse->nextResultSetPosition =
 709                     odr_intdup(odr_encode(), start+toget);
 710
 711                 send_to_client(new_apdu);
 712                 return 0;
 713             }
 714         }
 715     }
 716
 717     if (apdu->which != Z_APDU_searchRequest)
 718         return apdu;
 719     Z_SearchRequest *sr = apdu->u.searchRequest;
 720     Yaz_Z_Query *this_query = new Yaz_Z_Query;
 721     Yaz_Z_Databases this_databases;
 722
 723     this_databases.set(sr->num_databaseNames, (const char **)
 724                        sr->databaseNames);
 725
 726     this_query->set_Z_Query(sr->query);
 727
 728     char query_str[120];
 729     this_query->print(query_str, sizeof(query_str)-1);
 730     yaz_log(LOG_LOG, "%sSearch %s", m_session_str, query_str);
 731
 732     if (*m_parent->m_optimize != '0' &&
 733         m_client->m_last_ok && m_client->m_last_query &&
 734         m_client->m_last_query->match(this_query) &&
 735         !strcmp(m_client->m_last_resultSetId, sr->resultSetName) &&
 736         m_client->m_last_databases.match(this_databases))
 737     {
 738         delete this_query;
 739         if (m_client->m_last_resultCount > *sr->smallSetUpperBound &&
 740             m_client->m_last_resultCount < *sr->largeSetLowerBound)
 741         {
 742             Z_NamePlusRecordList *npr;
 743             int toget = *sr->mediumSetPresentNumber;
 744             Z_RecordComposition *comp = 0;
 745
 746             if (toget > m_client->m_last_resultCount)
 747                 toget = m_client->m_last_resultCount;
 748
 749             if (sr->mediumSetElementSetNames)
 750             {
 751                 comp = (Z_RecordComposition *)
 752                     odr_malloc(odr_encode(), sizeof(Z_RecordComposition));
 753                 comp->which = Z_RecordComp_simple;
 754                 comp->u.simple = sr->mediumSetElementSetNames;
 755             }
 756
 757             if (m_client->m_cache.lookup (odr_encode(), &npr, 1, toget,
 758                                           sr->preferredRecordSyntax, comp))
 759             {
 760                 yaz_log (LOG_LOG, "%sReturned cached records for medium set",
 761                          m_session_str);
 762                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
 763                 new_apdu->u.searchResponse->referenceId = sr->referenceId;
 764                 new_apdu->u.searchResponse->resultCount =
 765                     &m_client->m_last_resultCount;
 766
 767                 new_apdu->u.searchResponse->numberOfRecordsReturned
 768                     = odr_intdup(odr_encode(), toget);
 769
 770                 new_apdu->u.searchResponse->presentStatus =
 771                     odr_intdup(odr_encode(), Z_PresentStatus_success);
 772                 new_apdu->u.searchResponse->records = (Z_Records*)
 773                     odr_malloc(odr_encode(), sizeof(Z_Records));
 774                 new_apdu->u.searchResponse->records->which = Z_Records_DBOSD;
 775                 new_apdu->u.searchResponse->records->u.databaseOrSurDiagnostics = npr;
 776                 new_apdu->u.searchResponse->nextResultSetPosition =
 777                     odr_intdup(odr_encode(), toget+1);
 778                 send_to_client(new_apdu);
 779                 return 0;
 780             }
 781             else
 782             {
 783                 // medium Set
 784                 // send present request (medium size)
 785                 yaz_log (LOG_LOG, "%sOptimizing search for medium set",
 786                          m_session_str);
 787
 788                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentRequest);
 789                 Z_PresentRequest *pr = new_apdu->u.presentRequest;
 790                 pr->referenceId = sr->referenceId;
 791                 pr->resultSetId = sr->resultSetName;
 792                 pr->preferredRecordSyntax = sr->preferredRecordSyntax;
 793                 *pr->numberOfRecordsRequested = toget;
 794                 pr->recordComposition = comp;
 795                 m_client->m_sr_transform = 1;
 796                 return new_apdu;
 797             }
 798         }
 799         else if (m_client->m_last_resultCount >= *sr->largeSetLowerBound ||
 800             m_client->m_last_resultCount <= 0)
 801         {
 802             // large set. Return pseudo-search response immediately
 803             yaz_log (LOG_LOG, "%sOptimizing search for large set",
 804                      m_session_str);
 805             Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
 806             new_apdu->u.searchResponse->referenceId = sr->referenceId;
 807             new_apdu->u.searchResponse->resultCount =
 808                 &m_client->m_last_resultCount;
 809             send_to_client(new_apdu);
 810             return 0;
 811         }
 812         else
 813         {
 814             Z_NamePlusRecordList *npr;
 815             int toget = m_client->m_last_resultCount;
 816             Z_RecordComposition *comp = 0;
 817             // small set
 818             // send a present request (small set)
 819
 820             if (sr->smallSetElementSetNames)
 821             {
 822                 comp = (Z_RecordComposition *)
 823                     odr_malloc(odr_encode(), sizeof(Z_RecordComposition));
 824                 comp->which = Z_RecordComp_simple;
 825                 comp->u.simple = sr->smallSetElementSetNames;
 826             }
 827
 828             if (m_client->m_cache.lookup (odr_encode(), &npr, 1, toget,
 829                                           sr->preferredRecordSyntax, comp))
 830             {
 831                 yaz_log (LOG_LOG, "%sReturned cached records for small set",
 832                          m_session_str);
 833                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
 834                 new_apdu->u.searchResponse->referenceId = sr->referenceId;
 835                 new_apdu->u.searchResponse->resultCount =
 836                     &m_client->m_last_resultCount;
 837
 838                 new_apdu->u.searchResponse->numberOfRecordsReturned
 839                     = odr_intdup(odr_encode(), toget);
 840
 841                 new_apdu->u.searchResponse->presentStatus =
 842                     odr_intdup(odr_encode(), Z_PresentStatus_success);
 843                 new_apdu->u.searchResponse->records = (Z_Records*)
 844                     odr_malloc(odr_encode(), sizeof(Z_Records));
 845                 new_apdu->u.searchResponse->records->which = Z_Records_DBOSD;
 846                 new_apdu->u.searchResponse->records->u.databaseOrSurDiagnostics = npr;
 847                 new_apdu->u.searchResponse->nextResultSetPosition =
 848                     odr_intdup(odr_encode(), toget+1);
 849                 send_to_client(new_apdu);
 850                 return 0;
 851             }
 852             else
 853             {
 854                 yaz_log (LOG_LOG, "%sOptimizing search for small set",
 855                          m_session_str);
 856                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentRequest);
 857                 Z_PresentRequest *pr = new_apdu->u.presentRequest;
 858                 pr->referenceId = sr->referenceId;
 859                 pr->resultSetId = sr->resultSetName;
 860                 pr->preferredRecordSyntax = sr->preferredRecordSyntax;
 861                 *pr->numberOfRecordsRequested = toget;
 862                 pr->recordComposition = comp;
 863                 m_client->m_sr_transform = 1;
 864                 return new_apdu;
 865             }
 866         }
 867     }
 868     else  // query doesn't match
 869     {
 870         delete m_client->m_last_query;
 871         m_client->m_last_query = this_query;
 872         m_client->m_last_ok = 0;
 873         m_client->m_cache.clear();
 874         m_client->m_resultSetStartPoint = 0;
 875
 876         xfree (m_client->m_last_resultSetId);
 877         m_client->m_last_resultSetId = xstrdup (sr->resultSetName);
 878
 879         m_client->m_last_databases.set(sr->num_databaseNames,
 880                                        (const char **) sr->databaseNames);
 881     }
 882     return apdu;
 883 }
 884
 885
 886 void Yaz_Proxy::recv_Z_PDU(Z_APDU *apdu, int len)
 887 {
 888     char *cp = strchr(m_session_str, ' ');
 889     m_request_no++;
 890     if (cp)
 891         sprintf(cp+1, "%d ", m_request_no);
 892
 893     int reduce = 0;
 894     m_bytes_recv += len;
 895
 896     if (m_log_mask & PROXY_LOG_APDU_CLIENT)
 897         yaz_log (LOG_DEBUG, "%sReceiving %s from client %d bytes",
 898                  m_session_str, apdu_name(apdu), len);
 899
 900     if (m_bw_hold_PDU)     // double incoming PDU. shutdown now.
 901         shutdown();
 902
 903     m_bw_stat.add_bytes(len);
 904     m_pdu_stat.add_bytes(1);
 905
 906     int bw_total = m_bw_stat.get_total();
 907     int pdu_total = m_pdu_stat.get_total();
 908
 909     yaz_log(LOG_LOG, "%sstat bw=%d pdu=%d limit-bw=%d limit-pdu=%d",
 910             m_session_str, bw_total, pdu_total, m_bw_max, m_pdu_max);
 911     if (m_bw_max)
 912     {
 913         if (bw_total > m_bw_max)
 914         {
 915             reduce = (bw_total/m_bw_max);
 916         }
 917     }
 918     if (m_pdu_max)
 919     {
 920         if (pdu_total > m_pdu_max)
 921         {
 922             int nreduce = (60/m_pdu_max);
 923             reduce = (reduce > nreduce) ? reduce : nreduce;
 924         }
 925     }
 926     if (reduce)
 927     {
 928         yaz_log(LOG_LOG, "%sLimit delay=%d", m_session_str, reduce);
 929         m_bw_hold_PDU = apdu;  // save PDU and signal "on hold"
 930         timeout(reduce);       // call us reduce seconds later
 931     }
 932     else
 933         recv_Z_PDU_0(apdu);    // all fine. Proceed receive PDU as usual
 934 }
 935
 936 void Yaz_Proxy::handle_max_record_retrieve(Z_APDU *apdu)
 937 {
 938     if (m_max_record_retrieve)
 939     {
 940         if (apdu->which == Z_APDU_presentRequest)
 941         {
 942             Z_PresentRequest *pr = apdu->u.presentRequest;
 943             if (pr->numberOfRecordsRequested &&
 944                 *pr->numberOfRecordsRequested > m_max_record_retrieve)
 945                 *pr->numberOfRecordsRequested = m_max_record_retrieve;
 946         }
 947     }
 948 }
 949
 950 Z_Records *Yaz_Proxy::create_nonSurrogateDiagnostics(ODR odr,
 951                                                      int error,
 952                                                      const char *addinfo)
 953 {
 954     Z_Records *rec = (Z_Records *)
 955         odr_malloc (odr, sizeof(*rec));
 956     int *err = (int *)
 957         odr_malloc (odr, sizeof(*err));
 958     Z_DiagRec *drec = (Z_DiagRec *)
 959         odr_malloc (odr, sizeof(*drec));
 960     Z_DefaultDiagFormat *dr = (Z_DefaultDiagFormat *)
 961         odr_malloc (odr, sizeof(*dr));
 962     *err = error;
 963     rec->which = Z_Records_NSD;
 964     rec->u.nonSurrogateDiagnostic = dr;
 965     dr->diagnosticSetId =
 966         yaz_oidval_to_z3950oid (odr, CLASS_DIAGSET, VAL_BIB1);
 967     dr->condition = err;
 968     dr->which = Z_DefaultDiagFormat_v2Addinfo;
 969     dr->u.v2Addinfo = odr_strdup (odr, addinfo ? addinfo : "");
 970     return rec;
 971 }
 972
 973 Z_APDU *Yaz_Proxy::handle_query_validation(Z_APDU *apdu)
 974 {
 975     if (apdu->which == Z_APDU_searchRequest)
 976     {
 977         Z_SearchRequest *sr = apdu->u.searchRequest;
 978         int err = 0;
 979         char *addinfo = 0;
 980
 981         Yaz_ProxyConfig *cfg = check_reconfigure();
 982         if (cfg)
 983             err = cfg->check_query(odr_encode(), m_default_target,
 984                                    sr->query, &addinfo);
 985         if (err)
 986         {
 987             Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
 988
 989             new_apdu->u.searchResponse->referenceId = sr->referenceId;
 990             new_apdu->u.searchResponse->records =
 991                 create_nonSurrogateDiagnostics(odr_encode(), err, addinfo);
 992             *new_apdu->u.searchResponse->searchStatus = 0;
 993
 994             send_to_client(new_apdu);
 995
 996             return 0;
 997         }
 998     }
 999     return apdu;
1000 }
1001
1002 Z_APDU *Yaz_Proxy::handle_syntax_validation(Z_APDU *apdu)
1003 {
1004     m_marcxml_flag = 0;
1005     if (apdu->which == Z_APDU_searchRequest)
1006     {
1007         Z_SearchRequest *sr = apdu->u.searchRequest;
1008         if (*sr->smallSetUpperBound > 0 || *sr->mediumSetPresentNumber > 0)
1009         {
1010             int err = 0;
1011             char *addinfo = 0;
1012             Yaz_ProxyConfig *cfg = check_reconfigure();
1013
1014             if (cfg)
1015                 err = cfg->check_syntax(odr_encode(),
1016                                         m_default_target,
1017                                         sr->preferredRecordSyntax,
1018                                         &addinfo);
1019             if (err == -1)
1020             {
1021                 sr->preferredRecordSyntax =
1022                     yaz_oidval_to_z3950oid(odr_decode(), CLASS_RECSYN,
1023                                            VAL_USMARC);
1024                 m_marcxml_flag = 1;
1025             }
1026             else if (err)
1027             {
1028                 Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
1029
1030                 new_apdu->u.searchResponse->referenceId = sr->referenceId;
1031                 new_apdu->u.searchResponse->records =
1032                     create_nonSurrogateDiagnostics(odr_encode(), err, addinfo);
1033                 *new_apdu->u.searchResponse->searchStatus = 0;
1034
1035                 send_to_client(new_apdu);
1036
1037                 return 0;
1038             }
1039         }
1040     }
1041     else if (apdu->which == Z_APDU_presentRequest)
1042     {
1043         Z_PresentRequest *pr = apdu->u.presentRequest;
1044         int err = 0;
1045         char *addinfo = 0;
1046         Yaz_ProxyConfig *cfg = check_reconfigure();
1047
1048         if (cfg)
1049             err = cfg->check_syntax(odr_encode(), m_default_target,
1050                                     pr->preferredRecordSyntax,
1051                                     &addinfo);
1052         if (err == -1)
1053         {
1054             pr->preferredRecordSyntax =
1055                 yaz_oidval_to_z3950oid(odr_decode(), CLASS_RECSYN,
1056                                        VAL_USMARC);
1057             m_marcxml_flag = 1;
1058         }
1059         else if (err)
1060         {
1061             Z_APDU *new_apdu = create_Z_PDU(Z_APDU_presentResponse);
1062
1063             new_apdu->u.presentResponse->referenceId = pr->referenceId;
1064             new_apdu->u.presentResponse->records =
1065                 create_nonSurrogateDiagnostics(odr_encode(), err, addinfo);
1066             *new_apdu->u.presentResponse->presentStatus =
1067                 Z_PresentStatus_failure;
1068
1069             send_to_client(new_apdu);
1070
1071             return 0;
1072         }
1073     }
1074     return apdu;
1075 }
1076
1077 void Yaz_Proxy::recv_Z_PDU_0(Z_APDU *apdu)
1078 {
1079     // Determine our client.
1080     m_client = get_client(apdu);
1081     if (!m_client)
1082     {
1083         delete this;
1084         return;
1085     }
1086     m_client->m_server = this;
1087
1088     if (apdu->which == Z_APDU_initRequest)
1089     {
1090         if (apdu->u.initRequest->implementationId)
1091             yaz_log(LOG_LOG, "%simplementationId: %s",
1092                     m_session_str, apdu->u.initRequest->implementationId);
1093         if (apdu->u.initRequest->implementationName)
1094             yaz_log(LOG_LOG, "%simplementationName: %s",
1095                     m_session_str, apdu->u.initRequest->implementationName);
1096         if (apdu->u.initRequest->implementationVersion)
1097             yaz_log(LOG_LOG, "%simplementationVersion: %s",
1098                     m_session_str, apdu->u.initRequest->implementationVersion);
1099         if (m_client->m_init_flag)
1100         {
1101             Z_APDU *apdu = m_client->m_initResponse;
1102             apdu->u.initResponse->otherInfo = 0;
1103             if (m_client->m_cookie && *m_client->m_cookie)
1104                 set_otherInformationString(apdu, VAL_COOKIE, 1,
1105                                            m_client->m_cookie);
1106             send_to_client(apdu);
1107             return;
1108         }
1109         m_client->m_init_flag = 1;
1110     }
1111     handle_max_record_retrieve(apdu);
1112
1113     if (apdu)
1114         apdu = handle_syntax_validation(apdu);
1115
1116     if (apdu)
1117         apdu = handle_query_validation(apdu);
1118
1119     if (apdu)
1120         apdu = result_set_optimize(apdu);
1121     if (!apdu)
1122     {
1123         m_client->timeout(m_target_idletime);  // mark it active even
1124         // though we didn't use it
1125         return;
1126     }
1127
1128     // delete other info part from PDU before sending to target
1129     Z_OtherInformation **oi;
1130     get_otherInfoAPDU(apdu, &oi);
1131     if (oi)
1132         *oi = 0;
1133
1134     if (apdu->which == Z_APDU_presentRequest &&
1135         m_client->m_resultSetStartPoint == 0)
1136     {
1137         Z_PresentRequest *pr = apdu->u.presentRequest;
1138         m_client->m_resultSetStartPoint = *pr->resultSetStartPoint;
1139         m_client->m_cache.copy_presentRequest(apdu->u.presentRequest);
1140     } else {
1141         m_client->m_resultSetStartPoint = 0;
1142     }
1143     if (m_client->send_to_target(apdu) < 0)
1144     {
1145         delete m_client;
1146         m_client = 0;
1147         delete this;
1148     }
1149     else
1150         m_client->m_waiting = 1;
1151 }
1152
1153 void Yaz_Proxy::connectNotify()
1154 {
1155 }
1156
1157 void Yaz_Proxy::shutdown()
1158 {
1159     // only keep if keep_alive flag is set...
1160     if (m_client &&
1161         !m_invalid_session &&
1162         m_client->m_pdu_recv < m_keepalive_limit_pdu &&
1163         m_client->m_bytes_recv+m_client->m_bytes_sent < m_keepalive_limit_bw &&
1164         m_client->m_waiting == 0)
1165     {
1166         yaz_log(LOG_LOG, "%sShutdown (client to proxy) keepalive %s",
1167                  m_session_str,
1168                  m_client->get_hostname());
1169         yaz_log(LOG_LOG, "%sbw=%d pdu=%d limit-bw=%d limit-pdu=%d",
1170                 m_session_str, m_client->m_pdu_recv,
1171                 m_client->m_bytes_sent + m_client->m_bytes_recv,
1172                 m_keepalive_limit_bw, m_keepalive_limit_pdu);
1173         assert (m_client->m_waiting != 2);
1174         // Tell client (if any) that no server connection is there..
1175         m_client->m_server = 0;
1176     }
1177     else if (m_client)
1178     {
1179         yaz_log (LOG_LOG, "%sShutdown (client to proxy) close %s",
1180                  m_session_str,
1181                  m_client->get_hostname());
1182         assert (m_client->m_waiting != 2);
1183         delete m_client;
1184     }
1185     else if (!m_parent)
1186     {
1187         yaz_log (LOG_LOG, "%sshutdown (client to proxy) bad state",
1188                  m_session_str);
1189         assert (m_parent);
1190     }
1191     else
1192     {
1193         yaz_log (LOG_LOG, "%sShutdown (client to proxy)",
1194                  m_session_str);
1195     }
1196     if (m_parent)
1197         m_parent->pre_init();
1198     delete this;
1199 }
1200
1201 const char *Yaz_ProxyClient::get_session_str()
1202 {
1203     if (!m_server)
1204         return "0 ";
1205     return m_server->get_session_str();
1206 }
1207
1208 void Yaz_ProxyClient::shutdown()
1209 {
1210     yaz_log (LOG_LOG, "%sShutdown (proxy to target) %s", get_session_str(),
1211              get_hostname());
1212     delete m_server;
1213     delete this;
1214 }
1215
1216 void Yaz_Proxy::failNotify()
1217 {
1218     yaz_log (LOG_LOG, "%sConnection closed by client",
1219              get_session_str());
1220     shutdown();
1221 }
1222
1223 void Yaz_ProxyClient::failNotify()
1224 {
1225     yaz_log (LOG_LOG, "%sConnection closed by target %s",
1226              get_session_str(), get_hostname());
1227     shutdown();
1228 }
1229
1230 void Yaz_ProxyClient::connectNotify()
1231 {
1232     const char *s = get_session_str();
1233     const char *h = get_hostname();
1234     yaz_log (LOG_LOG, "%sConnection accepted by %s timeout=%d", s, h,
1235              m_target_idletime);
1236     timeout(m_target_idletime);
1237     if (!m_server)
1238         pre_init_client();
1239 }
1240
1241 IYaz_PDU_Observer *Yaz_ProxyClient::sessionNotify(IYaz_PDU_Observable
1242                                                   *the_PDU_Observable, int fd)
1243 {
1244     return new Yaz_ProxyClient(the_PDU_Observable, 0);
1245 }
1246
1247 Yaz_ProxyClient::~Yaz_ProxyClient()
1248 {
1249     if (m_prev)
1250         *m_prev = m_next;
1251     if (m_next)
1252         m_next->m_prev = m_prev;
1253     m_waiting = 2;     // for debugging purposes only.
1254     odr_destroy(m_init_odr);
1255     delete m_last_query;
1256     xfree (m_last_resultSetId);
1257     xfree (m_cookie);
1258 }
1259
1260 void Yaz_ProxyClient::pre_init_client()
1261 {
1262     Z_APDU *apdu = create_Z_PDU(Z_APDU_initRequest);
1263     Z_InitRequest *req = apdu->u.initRequest;
1264
1265     ODR_MASK_SET(req->options, Z_Options_search);
1266     ODR_MASK_SET(req->options, Z_Options_present);
1267     ODR_MASK_SET(req->options, Z_Options_namedResultSets);
1268     ODR_MASK_SET(req->options, Z_Options_triggerResourceCtrl);
1269     ODR_MASK_SET(req->options, Z_Options_scan);
1270     ODR_MASK_SET(req->options, Z_Options_sort);
1271     ODR_MASK_SET(req->options, Z_Options_extendedServices);
1272     ODR_MASK_SET(req->options, Z_Options_delSet);
1273
1274     ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_1);
1275     ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_2);
1276     ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_3);
1277
1278     if (send_to_target(apdu) < 0)
1279     {
1280         delete this;
1281     }
1282     else
1283     {
1284         m_waiting = 1;
1285         m_init_flag = 1;
1286     }
1287 }
1288
1289 void Yaz_Proxy::pre_init()
1290 {
1291     int i;
1292     const char *name = 0;
1293     const char *zurl_in_use[MAX_ZURL_PLEX];
1294     int limit_bw, limit_pdu, limit_req;
1295     int target_idletime, client_idletime;
1296     int max_clients;
1297     int keepalive_limit_bw, keepalive_limit_pdu;
1298     int pre_init;
1299
1300     Yaz_ProxyConfig *cfg = check_reconfigure();
1301
1302     zurl_in_use[0] = 0;
1303
1304     if (m_log_mask & PROXY_LOG_APDU_CLIENT)
1305         set_APDU_yazlog(1);
1306     else
1307         set_APDU_yazlog(0);
1308
1309     for (i = 0; cfg && cfg->get_target_no(i, &name, zurl_in_use,
1310                                           &limit_bw, &limit_pdu, &limit_req,
1311                                           &target_idletime, &client_idletime,
1312                                           &max_clients,
1313                                           &keepalive_limit_bw,
1314                                           &keepalive_limit_pdu,
1315                                           &pre_init) ; i++)
1316     {
1317         if (pre_init)
1318         {
1319             int j;
1320             for (j = 0; zurl_in_use[j]; j++)
1321             {
1322                 Yaz_ProxyClient *c;
1323                 int spare = 0;
1324                 for (c = m_clientPool; c; c = c->m_next)
1325                 {
1326                     if (!strcmp(zurl_in_use[j], c->get_hostname())
1327                         && c->m_server == 0 && c->m_cookie == 0)
1328                         spare++;
1329                 }
1330                 yaz_log(LOG_LOG, "%s pre-init %s %s spare=%d pre_init=%d",
1331                         m_session_str,
1332                         name, zurl_in_use[j], spare, pre_init);
1333                 if (spare < pre_init)
1334                 {
1335                     c = new Yaz_ProxyClient(m_PDU_Observable->clone(), this);
1336                     c->m_next = m_clientPool;
1337                     if (c->m_next)
1338                         c->m_next->m_prev = &c->m_next;
1339                     m_clientPool = c;
1340                     c->m_prev = &m_clientPool;
1341
1342                     if (m_log_mask & PROXY_LOG_APDU_SERVER)
1343                         c->set_APDU_yazlog(1);
1344                     else
1345                         c->set_APDU_yazlog(0);
1346
1347                     if (c->client(zurl_in_use[j]))
1348                     {
1349                         timeout(60);
1350                         delete c;
1351                         return;
1352                     }
1353                     c->timeout(30);
1354                     c->m_waiting = 1;
1355                     c->m_target_idletime = target_idletime;
1356                     c->m_seqno = m_seqno++;
1357                 }
1358             }
1359         }
1360     }
1361 }
1362
1363 void Yaz_Proxy::timeoutNotify()
1364 {
1365     if (m_parent)
1366     {
1367         if (m_bw_hold_PDU)
1368         {
1369             timeout(m_client_idletime);
1370             Z_APDU *apdu = m_bw_hold_PDU;
1371             m_bw_hold_PDU = 0;
1372             recv_Z_PDU_0(apdu);
1373         }
1374         else
1375         {
1376             yaz_log (LOG_LOG, "%sTimeout (client to proxy)", m_session_str);
1377             shutdown();
1378         }
1379     }
1380     else
1381     {
1382         timeout(600);
1383         pre_init();
1384     }
1385 }
1386
1387 void Yaz_ProxyClient::timeoutNotify()
1388 {
1389     yaz_log (LOG_LOG, "%sTimeout (proxy to target) %s", get_session_str(),
1390              get_hostname());
1391     m_waiting = 1;
1392     m_root->pre_init();
1393     shutdown();
1394 }
1395
1396 Yaz_ProxyClient::Yaz_ProxyClient(IYaz_PDU_Observable *the_PDU_Observable,
1397                                  Yaz_Proxy *parent) :
1398     Yaz_Z_Assoc (the_PDU_Observable)
1399 {
1400     m_cookie = 0;
1401     m_next = 0;
1402     m_prev = 0;
1403     m_init_flag = 0;
1404     m_last_query = 0;
1405     m_last_resultSetId = 0;
1406     m_last_resultCount = 0;
1407     m_last_ok = 0;
1408     m_sr_transform = 0;
1409     m_waiting = 0;
1410     m_init_odr = odr_createmem (ODR_DECODE);
1411     m_initResponse = 0;
1412     m_resultSetStartPoint = 0;
1413     m_bytes_sent = m_bytes_recv = 0;
1414     m_pdu_recv = 0;
1415     m_server = 0;
1416     m_seqno = 0;
1417     m_target_idletime = 600;
1418     m_root = parent;
1419 }
1420
1421 const char *Yaz_Proxy::option(const char *name, const char *value)
1422 {
1423     if (!strcmp (name, "optimize")) {
1424         if (value) {
1425             xfree (m_optimize);
1426             m_optimize = xstrdup (value);
1427         }
1428         return m_optimize;
1429     }
1430     return 0;
1431 }
1432
1433 void Yaz_ProxyClient::recv_Z_PDU(Z_APDU *apdu, int len)
1434 {
1435     m_bytes_recv += len;
1436     m_pdu_recv++;
1437     m_waiting = 0;
1438     if (m_root->get_log_mask() & PROXY_LOG_REQ_SERVER)
1439         yaz_log (LOG_LOG, "%sReceiving %s from %s %d bytes", get_session_str(),
1440                  apdu_name(apdu), get_hostname(), len);
1441     if (apdu->which == Z_APDU_initResponse)
1442     {
1443         if (!m_server)  // if this is a pre init session , check for more
1444             m_root->pre_init();
1445         NMEM nmem = odr_extract_mem (odr_decode());
1446         odr_reset (m_init_odr);
1447         nmem_transfer (m_init_odr->mem, nmem);
1448         m_initResponse = apdu;
1449
1450         Z_InitResponse *ir = apdu->u.initResponse;
1451         char *im0 = ir->implementationName;
1452
1453         char *im1 = (char*)
1454             odr_malloc(m_init_odr, 20 + (im0 ? strlen(im0) : 0));
1455         *im1 = '\0';
1456         if (im0)
1457         {
1458             strcat(im1, im0);
1459             strcat(im1, " ");
1460         }
1461         strcat(im1, "(YAZ Proxy)");
1462         ir->implementationName = im1;
1463
1464         nmem_destroy (nmem);
1465     }
1466     if (apdu->which == Z_APDU_searchResponse)
1467     {
1468         Z_SearchResponse *sr = apdu->u.searchResponse;
1469         m_last_resultCount = *sr->resultCount;
1470         int status = *sr->searchStatus;
1471         if (status && (!sr->records || sr->records->which == Z_Records_DBOSD))
1472         {
1473             m_last_ok = 1;
1474
1475             if (sr->records && sr->records->which == Z_Records_DBOSD)
1476             {
1477                 m_cache.add(odr_decode(),
1478                             sr->records->u.databaseOrSurDiagnostics, 1,
1479                             *sr->resultCount);
1480             }
1481         }
1482     }
1483     if (apdu->which == Z_APDU_presentResponse)
1484     {
1485         Z_PresentResponse *pr = apdu->u.presentResponse;
1486         if (m_sr_transform)
1487         {
1488             m_sr_transform = 0;
1489             Z_APDU *new_apdu = create_Z_PDU(Z_APDU_searchResponse);
1490             Z_SearchResponse *sr = new_apdu->u.searchResponse;
1491             sr->referenceId = pr->referenceId;
1492             *sr->resultCount = m_last_resultCount;
1493             sr->records = pr->records;
1494             sr->nextResultSetPosition = pr->nextResultSetPosition;
1495             sr->numberOfRecordsReturned = pr->numberOfRecordsReturned;
1496             apdu = new_apdu;
1497         }
1498         if (pr->records &&
1499             pr->records->which == Z_Records_DBOSD && m_resultSetStartPoint)
1500         {
1501             m_cache.add(odr_decode(),
1502                         pr->records->u.databaseOrSurDiagnostics,
1503                         m_resultSetStartPoint, -1);
1504             m_resultSetStartPoint = 0;
1505         }
1506     }
1507     if (m_cookie)
1508         set_otherInformationString (apdu, VAL_COOKIE, 1, m_cookie);
1509     if (m_server)
1510     {
1511         m_server->send_to_client(apdu);
1512     }
1513     if (apdu->which == Z_APDU_close)
1514     {
1515         shutdown();
1516     }
1517 }
1518
1519 void Yaz_Proxy::server(const char *addr)
1520 {
1521     Yaz_Z_Assoc::server(addr);
1522
1523     timeout(1);
1524 }
1525