src/http_command.c

   1 /* This file is part of Pazpar2.
   2    Copyright (C) 2006-2013 Index Data
   3
   4 Pazpar2 is free software; you can redistribute it and/or modify it under
   5 the terms of the GNU General Public License as published by the Free
   6 Software Foundation; either version 2, or (at your option) any later
   7 version.
   8
   9 Pazpar2 is distributed in the hope that it will be useful, but WITHOUT ANY
  10 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17
  18 */
  19
  20 #if HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23 #include <stdio.h>
  24 #include <sys/types.h>
  25 #if HAVE_UNISTD_H
  26 #include <unistd.h>
  27 #endif
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #if HAVE_SYS_TIME_H
  31 #include <sys/time.h>
  32 #endif
  33 #include <yaz/snprintf.h>
  34 #include <yaz/yaz-util.h>
  35
  36 #include "ppmutex.h"
  37 #include "eventl.h"
  38 #include "parameters.h"
  39 #include "session.h"
  40 #include "http.h"
  41 #include "settings.h"
  42 #include "client.h"
  43
  44 #ifdef HAVE_MALLINFO
  45 #include <malloc.h>
  46
  47 void print_meminfo(WRBUF wrbuf)
  48 {
  49     struct mallinfo minfo;
  50     minfo = mallinfo();
  51     wrbuf_printf(wrbuf, "  <memory>\n"
  52                         "   <arena>%d</arena>\n"
  53                         "   <uordblks>%d</uordblks>\n"
  54                         "   <fordblks>%d</fordblks>\n"
  55                         "   <ordblks>%d</ordblks>\n"
  56                         "   <keepcost>%d</keepcost>\n"
  57                         "   <hblks>%d</hblks>\n"
  58                         "   <hblkhd>%d</hblkhd>\n"
  59                         "   <virt>%d</virt>\n"
  60                         "   <virtuse>%d</virtuse>\n"
  61                         "  </memory>\n",
  62                  minfo.arena, minfo.uordblks, minfo.fordblks,minfo.ordblks, minfo.keepcost, minfo.hblks, minfo.hblkhd, minfo.arena + minfo.hblkhd, minfo.uordblks + minfo.hblkhd);
  63
  64 }
  65 #else
  66 #define print_meminfo(x)
  67 #endif
  68
  69
  70 // Update this when the protocol changes
  71 #define PAZPAR2_PROTOCOL_VERSION "1"
  72
  73 #define HTTP_COMMAND_RESPONSE_PREFIX "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
  74
  75 struct http_session {
  76     IOCHAN timeout_iochan;     // NOTE: This is NOT associated with a socket
  77     struct session *psession;
  78     unsigned int session_id;
  79     int timestamp;
  80     int destroy_counter;
  81     int activity_counter;
  82     NMEM nmem;
  83     http_sessions_t http_sessions;
  84     struct http_session *next;
  85 };
  86
  87 struct http_sessions {
  88     struct http_session *session_list;
  89     YAZ_MUTEX mutex;
  90     int log_level;
  91 };
  92
  93 static YAZ_MUTEX g_http_session_mutex = 0;
  94 static int g_http_sessions = 0;
  95
  96 int get_version(struct http_request *rq) {
  97     const char *version = http_argbyname(rq, "version");
  98     int version_no = 0;
  99     if (version && strcmp(version, "")) {
 100         version_no = atoi(version);
 101     }
 102     return version_no;
 103 }
 104
 105
 106 int http_session_use(int delta)
 107 {
 108     int sessions;
 109     if (!g_http_session_mutex)
 110         yaz_mutex_create(&g_http_session_mutex);
 111     yaz_mutex_enter(g_http_session_mutex);
 112     g_http_sessions += delta;
 113     sessions = g_http_sessions;
 114     yaz_mutex_leave(g_http_session_mutex);
 115     yaz_log(YLOG_DEBUG, "%s sessions=%d", delta == 0 ? "" : (delta > 0 ? "INC" : "DEC"), sessions);
 116     return sessions;
 117
 118 }
 119
 120 http_sessions_t http_sessions_create(void)
 121 {
 122     http_sessions_t hs = xmalloc(sizeof(*hs));
 123     hs->session_list = 0;
 124     hs->mutex = 0;
 125     pazpar2_mutex_create(&hs->mutex, "http_sessions");
 126     hs->log_level = yaz_log_module_level("HTTP");
 127     return hs;
 128 }
 129
 130 void http_sessions_destroy(http_sessions_t hs)
 131 {
 132     if (hs)
 133     {
 134         struct http_session *s = hs->session_list;
 135         while (s)
 136         {
 137             struct http_session *s_next = s->next;
 138             iochan_destroy(s->timeout_iochan);
 139             session_destroy(s->psession);
 140             nmem_destroy(s->nmem);
 141             s = s_next;
 142         }
 143         yaz_mutex_destroy(&hs->mutex);
 144         xfree(hs);
 145     }
 146 }
 147
 148 void http_session_destroy(struct http_session *s);
 149
 150 static void session_timeout(IOCHAN i, int event)
 151 {
 152     struct http_session *s = iochan_getdata(i);
 153     http_session_destroy(s);
 154 }
 155
 156 struct http_session *http_session_create(struct conf_service *service,
 157                                          http_sessions_t http_sessions,
 158                                          unsigned int sesid)
 159 {
 160     NMEM nmem = nmem_create();
 161     struct http_session *r = nmem_malloc(nmem, sizeof(*r));
 162     char tmp_str[50];
 163
 164     sprintf(tmp_str, "session#%u", sesid);
 165     r->psession = session_create(nmem, service, sesid);
 166     r->session_id = sesid;
 167     r->timestamp = 0;
 168     r->nmem = nmem;
 169     r->destroy_counter = r->activity_counter = 0;
 170     r->http_sessions = http_sessions;
 171
 172     yaz_mutex_enter(http_sessions->mutex);
 173     r->next = http_sessions->session_list;
 174     http_sessions->session_list = r;
 175     yaz_mutex_leave(http_sessions->mutex);
 176
 177     r->timeout_iochan = iochan_create(-1, session_timeout, 0, "http_session_timeout");
 178     iochan_setdata(r->timeout_iochan, r);
 179     yaz_log(http_sessions->log_level, "Session %u created. timeout chan=%p timeout=%d", sesid, r->timeout_iochan, service->session_timeout);
 180     iochan_settimeout(r->timeout_iochan, service->session_timeout);
 181
 182     iochan_add(service->server->iochan_man, r->timeout_iochan);
 183     http_session_use(1);
 184     return r;
 185 }
 186
 187 void http_session_destroy(struct http_session *s)
 188 {
 189     int must_destroy = 0;
 190
 191     http_sessions_t http_sessions = s->http_sessions;
 192
 193     yaz_log(http_sessions->log_level, "Session %u destroy", s->session_id);
 194     yaz_mutex_enter(http_sessions->mutex);
 195     /* only if http_session has no active http sessions on it can be destroyed */
 196     if (s->destroy_counter == s->activity_counter)
 197     {
 198         struct http_session **p = 0;
 199         must_destroy = 1;
 200         for (p = &http_sessions->session_list; *p; p = &(*p)->next)
 201             if (*p == s)
 202             {
 203                 *p = (*p)->next;
 204                 break;
 205             }
 206     }
 207     yaz_mutex_leave(http_sessions->mutex);
 208     if (must_destroy)
 209     {   /* destroying for real */
 210         yaz_log(http_sessions->log_level, "Session %u destroyed", s->session_id);
 211         iochan_destroy(s->timeout_iochan);
 212         session_destroy(s->psession);
 213         http_session_use(-1);
 214         nmem_destroy(s->nmem);
 215     }
 216     else {
 217         yaz_log(http_sessions->log_level, "Session %u destroying delayed. Active clients (%d-%d). Waiting for new timeout.",
 218                 s->session_id, s->activity_counter, s->destroy_counter);
 219     }
 220
 221 }
 222
 223 static const char *get_msg(enum pazpar2_error_code code)
 224 {
 225     struct pazpar2_error_msg {
 226         enum pazpar2_error_code code;
 227         const char *msg;
 228     };
 229     static const struct pazpar2_error_msg ar[] = {
 230         { PAZPAR2_NO_SESSION, "Session does not exist or it has expired"},
 231         { PAZPAR2_MISSING_PARAMETER, "Missing parameter"},
 232         { PAZPAR2_MALFORMED_PARAMETER_VALUE, "Malformed parameter value"},
 233         { PAZPAR2_MALFORMED_PARAMETER_ENCODING, "Malformed parameter encoding"},
 234         { PAZPAR2_MALFORMED_SETTING, "Malformed setting argument"},
 235         { PAZPAR2_HITCOUNTS_FAILED, "Failed to retrieve hitcounts"},
 236         { PAZPAR2_RECORD_MISSING, "Record missing"},
 237         { PAZPAR2_NO_TARGETS, "No targets"},
 238         { PAZPAR2_CONFIG_TARGET, "Target cannot be configured"},
 239         { PAZPAR2_RECORD_FAIL, "Record command failed"},
 240         { PAZPAR2_NOT_IMPLEMENTED, "Not implemented"},
 241         { PAZPAR2_NO_SERVICE, "No service"},
 242         { PAZPAR2_ALREADY_BLOCKED, "Already blocked in session on: "},
 243         { PAZPAR2_LAST_ERROR, "Last error"},
 244         { 0, 0 }
 245     };
 246     int i = 0;
 247     while (ar[i].msg)
 248     {
 249         if (code == ar[i].code)
 250             return ar[i].msg;
 251         i++;
 252     }
 253     return "No error";
 254 }
 255
 256 static void error(struct http_response *rs,
 257                   enum pazpar2_error_code code,
 258                   const char *addinfo)
 259 {
 260     struct http_channel *c = rs->channel;
 261     WRBUF text = wrbuf_alloc();
 262     const char *http_status = "417";
 263     const char *msg = get_msg(code);
 264
 265     rs->msg = nmem_strdup(c->nmem, msg);
 266     strcpy(rs->code, http_status);
 267
 268     wrbuf_printf(text, HTTP_COMMAND_RESPONSE_PREFIX "<error code=\"%d\" msg=\"%s\">", (int) code,
 269                msg);
 270     if (addinfo)
 271         wrbuf_xmlputs(text, addinfo);
 272     wrbuf_puts(text, "</error>");
 273
 274     yaz_log(YLOG_WARN, "HTTP %s %s%s%s", http_status,
 275             msg, addinfo ? ": " : "" , addinfo ? addinfo : "");
 276     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(text));
 277     wrbuf_destroy(text);
 278     http_send_response(c);
 279 }
 280
 281 static void response_open_no_status(struct http_channel *c, const char *command)
 282 {
 283     wrbuf_rewind(c->wrbuf);
 284     wrbuf_printf(c->wrbuf, "%s<%s>",
 285                  HTTP_COMMAND_RESPONSE_PREFIX, command);
 286 }
 287
 288 static void response_open(struct http_channel *c, const char *command)
 289 {
 290     response_open_no_status(c, command);
 291     wrbuf_puts(c->wrbuf, "<status>OK</status>");
 292 }
 293
 294 static void response_close(struct http_channel *c, const char *command)
 295 {
 296     struct http_response *rs = c->response;
 297
 298     wrbuf_printf(c->wrbuf, "</%s>", command);
 299     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 300     http_send_response(c);
 301 }
 302
 303 unsigned int make_sessionid(void)
 304 {
 305     static int seq = 0; /* thread pr */
 306     unsigned int res;
 307
 308     seq++;
 309     if (global_parameters.predictable_sessions)
 310         res = seq;
 311     else
 312     {
 313 #ifdef WIN32
 314         res = seq;
 315 #else
 316         struct timeval t;
 317
 318         if (gettimeofday(&t, 0) < 0)
 319         {
 320             yaz_log(YLOG_WARN|YLOG_ERRNO, "gettimeofday");
 321             exit(1);
 322         }
 323         /* at most 256 sessions per second ..
 324            (long long would be more appropriate)*/
 325         res = t.tv_sec;
 326         res = ((res << 8) | (seq & 0xff)) & ((1U << 31) - 1);
 327 #endif
 328     }
 329     return res;
 330 }
 331
 332 static struct http_session *locate_session(struct http_channel *c)
 333 {
 334     struct http_request *rq = c->request;
 335     struct http_response *rs = c->response;
 336     struct http_session *p;
 337     const char *session = http_argbyname(rq, "session");
 338     http_sessions_t http_sessions = c->http_sessions;
 339     unsigned int id;
 340
 341     if (!session)
 342     {
 343         error(rs, PAZPAR2_MISSING_PARAMETER, "session");
 344         return 0;
 345     }
 346     id = atoi(session);
 347     yaz_mutex_enter(http_sessions->mutex);
 348     for (p = http_sessions->session_list; p; p = p->next)
 349         if (id == p->session_id)
 350             break;
 351     if (p)
 352         p->activity_counter++;
 353     yaz_mutex_leave(http_sessions->mutex);
 354     if (p)
 355         iochan_activity(p->timeout_iochan);
 356     else
 357         error(rs, PAZPAR2_NO_SESSION, session);
 358     return p;
 359 }
 360
 361 // Call after use of locate_session, in order to increment the destroy_counter
 362 static void release_session(struct http_channel *c,
 363                             struct http_session *session)
 364 {
 365     http_sessions_t http_sessions = c->http_sessions;
 366     yaz_mutex_enter(http_sessions->mutex);
 367     if (session)
 368         session->destroy_counter++;
 369     yaz_mutex_leave(http_sessions->mutex);
 370 }
 371
 372 // Decode settings parameters and apply to session
 373 // Syntax: setting[target]=value
 374 static int process_settings(struct session *se, struct http_request *rq,
 375                             struct http_response *rs)
 376 {
 377     struct http_argument *a;
 378
 379     for (a = rq->arguments; a; a = a->next)
 380         if (strchr(a->name, '['))
 381         {
 382             char **res;
 383             int num;
 384             char *dbname;
 385             char *setting;
 386
 387             // Nmem_strsplit *rules*!!!
 388             nmem_strsplit(se->session_nmem, "[]", a->name, &res, &num);
 389             if (num != 2)
 390             {
 391                 error(rs, PAZPAR2_MALFORMED_SETTING, a->name);
 392                 return -1;
 393             }
 394             setting = res[0];
 395             dbname = res[1];
 396             session_apply_setting(se, dbname, setting,
 397                     nmem_strdup(se->session_nmem, a->value));
 398         }
 399     return 0;
 400 }
 401
 402 static void cmd_exit(struct http_channel *c)
 403 {
 404     yaz_log(YLOG_WARN, "exit");
 405
 406     response_open(c, "exit");
 407     response_close(c, "exit");
 408     if (global_parameters.debug_mode)
 409         http_close_server(c->server);
 410 }
 411
 412 static void cmd_init(struct http_channel *c)
 413 {
 414     struct http_request *r = c->request;
 415     const char *clear = http_argbyname(r, "clear");
 416     const char *content_type = http_lookup_header(r->headers, "Content-Type");
 417     unsigned int sesid;
 418     struct http_session *s;
 419     struct http_response *rs = c->response;
 420     struct conf_service *service = 0; /* no service (yet) */
 421
 422     if (r->content_len && content_type &&
 423         !yaz_strcmp_del("text/xml", content_type, "; "))
 424     {
 425         xmlDoc *doc = xmlParseMemory(r->content_buf, r->content_len);
 426         xmlNode *root_n;
 427         if (!doc)
 428         {
 429             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 430             return;
 431         }
 432         root_n = xmlDocGetRootElement(doc);
 433         service = service_create(c->server, root_n);
 434         xmlFreeDoc(doc);
 435         if (!service)
 436         {
 437             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 438             return;
 439         }
 440     }
 441
 442     if (!service)
 443     {
 444         const char *service_name = http_argbyname(c->request, "service");
 445         service = locate_service(c->server, service_name);
 446         if (!service)
 447         {
 448             error(rs, PAZPAR2_NO_SERVICE, service_name ? service_name : "unnamed");
 449             return;
 450         }
 451     }
 452     sesid = make_sessionid();
 453     s = http_session_create(service, c->http_sessions, sesid);
 454
 455     yaz_log(c->http_sessions->log_level, "Session init %u ", sesid);
 456     if (!clear || *clear == '0')
 457         session_init_databases(s->psession);
 458     else
 459         yaz_log(YLOG_LOG, "Session %u init: No databases preloaded", sesid);
 460
 461     if (process_settings(s->psession, c->request, c->response) < 0)
 462         return;
 463
 464     response_open(c, "init");
 465     wrbuf_printf(c->wrbuf, "<session>%d", sesid);
 466     if (c->server->server_id)
 467     {
 468         wrbuf_puts(c->wrbuf, ".");
 469         wrbuf_puts(c->wrbuf, c->server->server_id);
 470     }
 471     wrbuf_puts(c->wrbuf, "</session>"
 472                "<protocol>" PAZPAR2_PROTOCOL_VERSION "</protocol>");
 473
 474     wrbuf_printf(c->wrbuf, "<keepAlive>%d</keepAlive>\n", 1000 * ((s->psession->service->session_timeout >= 20) ?
 475                                                                   (s->psession->service->session_timeout - 10) : 50));
 476     response_close(c, "init");
 477 }
 478
 479 static void apply_local_setting(void *client_data,
 480                                 struct setting *set)
 481 {
 482     struct session *se =  (struct session *) client_data;
 483
 484     session_apply_setting(se, nmem_strdup(se->session_nmem, set->target),
 485                           nmem_strdup(se->session_nmem, set->name),
 486                           nmem_strdup(se->session_nmem, set->value));
 487 }
 488
 489 static void cmd_settings(struct http_channel *c)
 490 {
 491     struct http_response *rs = c->response;
 492     struct http_request *rq = c->request;
 493     struct http_session *s = locate_session(c);
 494     const char *content_type = http_lookup_header(rq->headers, "Content-Type");
 495
 496     if (!s)
 497         return;
 498
 499     if (rq->content_len && content_type &&
 500         !yaz_strcmp_del("text/xml", content_type, "; "))
 501     {
 502         xmlDoc *doc = xmlParseMemory(rq->content_buf, rq->content_len);
 503         xmlNode *root_n;
 504         int ret;
 505         if (!doc)
 506         {
 507             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 508             release_session(c,s);
 509             return;
 510         }
 511         root_n = xmlDocGetRootElement(doc);
 512         ret = settings_read_node_x(root_n, s->psession, apply_local_setting);
 513         xmlFreeDoc(doc);
 514         if (ret)
 515         {
 516             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 517             release_session(c,s);
 518             return;
 519         }
 520     }
 521     if (process_settings(s->psession, rq, rs) < 0)
 522     {
 523         release_session(c, s);
 524         return;
 525     }
 526     response_open(c, "settings");
 527     response_close(c, "settings");
 528     release_session(c, s);
 529 }
 530
 531 static void termlist_response(struct http_channel *c, struct http_session *s, const char *cmd_status)
 532 {
 533     struct http_request *rq = c->request;
 534     const char *name    = http_argbyname(rq, "name");
 535     const char *nums    = http_argbyname(rq, "num");
 536     int version = get_version(rq);
 537     int num = 15;
 538     int status;
 539
 540     if (nums)
 541         num = atoi(nums);
 542
 543     status = session_active_clients(s->psession);
 544
 545     response_open_no_status(c, "termlist");
 546     /* new protocol add a status to response. Triggered by a status parameter */
 547     if (cmd_status != 0) {
 548         wrbuf_printf(c->wrbuf, "<status>%s</status>\n", cmd_status);
 549     }
 550     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", status);
 551
 552     perform_termlist(c, s->psession, name, num, version);
 553
 554     response_close(c, "termlist");
 555 }
 556
 557 static void termlist_result_ready(void *data)
 558 {
 559     struct http_channel *c = (struct http_channel *) data;
 560     struct http_request *rq = c->request;
 561     const char *report = http_argbyname(rq, "report");
 562     const char *status = 0;
 563     struct http_session *s = locate_session(c);
 564     if (report && !strcmp("status", report))
 565         status = "OK";
 566     if (s) {
 567         yaz_log(c->http_sessions->log_level, "Session %u termlist watch released", s->session_id);
 568         termlist_response(c, s, status);
 569         release_session(c,s);
 570     }
 571 }
 572
 573 static void cmd_termlist(struct http_channel *c)
 574 {
 575     struct http_request *rq = c->request;
 576     struct http_response *rs = c->response;
 577     struct http_session *s = locate_session(c);
 578     const char *block = http_argbyname(rq, "block");
 579     const char *report = http_argbyname(rq, "report");
 580     int report_status = 0;
 581     int report_error = 0;
 582     const char *status_message = 0;
 583     int active_clients;
 584     if (report  && !strcmp("error", report)) {
 585         report_error = 1;
 586         status_message = "OK";
 587     }
 588     if (report  && !strcmp("status", report)) {
 589         report_status = 1;
 590         status_message = "OK";
 591     }
 592     if (!s)
 593         return;
 594
 595     active_clients = session_active_clients(s->psession);
 596     if (block && !strcmp("1", block) && active_clients)
 597     {
 598         // if there is already a watch/block. we do not block this one
 599         if (session_set_watch(s->psession, SESSION_WATCH_TERMLIST,
 600                               termlist_result_ready, c, c) != 0)
 601         {
 602             yaz_log(YLOG_WARN, "Session %u: Attempt to block multiple times on termlist block. Not supported!", s->session_id);
 603             if (report_error) {
 604                 error(rs, PAZPAR2_ALREADY_BLOCKED, "termlist");
 605                 release_session(c, s);
 606                 return;
 607             }
 608             else if (report_status) {
 609                 status_message = "WARNING (Already blocked on termlist)";
 610             }
 611             else {
 612                 yaz_log(YLOG_WARN, "Session %u: Ignoring termlist block. Return current result", s->session_id);
 613             }
 614         }
 615         else
 616         {
 617             yaz_log(c->http_sessions->log_level, "Session %u: Blocking on command termlist", s->session_id);
 618             release_session(c, s);
 619             return;
 620         }
 621     }
 622
 623     termlist_response(c, s, status_message);
 624     release_session(c, s);
 625 }
 626
 627 size_t session_get_memory_status(struct session *session);
 628
 629 static void session_status(struct http_channel *c, struct http_session *s)
 630 {
 631     size_t session_nmem;
 632     wrbuf_printf(c->wrbuf, "<http_count>%u</http_count>\n", s->activity_counter);
 633     wrbuf_printf(c->wrbuf, "<http_nmem>%zu</http_nmem>\n", nmem_total(s->nmem) );
 634     session_nmem = session_get_memory_status(s->psession);
 635     wrbuf_printf(c->wrbuf, "<session_nmem>%zu</session_nmem>\n", session_nmem);
 636 }
 637
 638 static void cmd_session_status(struct http_channel *c)
 639 {
 640     struct http_session *s = locate_session(c);
 641     if (!s)
 642         return;
 643
 644     response_open(c, "session-status");
 645     session_status(c, s);
 646     response_close(c, "session-status");
 647     release_session(c, s);
 648 }
 649
 650 int sessions_count(void);
 651 int clients_count(void);
 652 #ifdef HAVE_RESULTSETS_COUNT
 653 int resultsets_count(void);
 654 #else
 655 #define resultsets_count()      0
 656 #endif
 657
 658 static void cmd_server_status(struct http_channel *c)
 659 {
 660     int sessions   = sessions_count();
 661     int clients    = clients_count();
 662     int resultsets = resultsets_count();
 663
 664     response_open(c, "server-status");
 665     wrbuf_printf(c->wrbuf, "\n  <sessions>%u</sessions>\n", sessions);
 666     wrbuf_printf(c->wrbuf, "  <clients>%u</clients>\n",   clients);
 667     /* Only works if yaz has been compiled with enabling of this */
 668     wrbuf_printf(c->wrbuf, "  <resultsets>%u</resultsets>\n",resultsets);
 669     print_meminfo(c->wrbuf);
 670
 671 /* TODO add all sessions status                         */
 672 /*    http_sessions_t http_sessions = c->http_sessions; */
 673 /*    struct http_session *p;                           */
 674 /*
 675     yaz_mutex_enter(http_sessions->mutex);
 676     for (p = http_sessions->session_list; p; p = p->next)
 677     {
 678         p->activity_counter++;
 679         wrbuf_puts(c->wrbuf, "<session-status>\n");
 680         wrbuf_printf(c->wrbuf, "<id>%s</id>\n", p->session_id);
 681         yaz_mutex_leave(http_sessions->mutex);
 682         session_status(c, p);
 683         wrbuf_puts(c->wrbuf, "</session-status>\n");
 684         yaz_mutex_enter(http_sessions->mutex);
 685         p->activity_counter--;
 686     }
 687     yaz_mutex_leave(http_sessions->mutex);
 688 */
 689     response_close(c, "server-status");
 690     xmalloc_trav(0);
 691 }
 692
 693 static void bytarget_response(struct http_channel *c, struct http_session *s, const char *cmd_status) {
 694     int count, i;
 695     struct hitsbytarget *ht;
 696     struct http_request *rq = c->request;
 697     const char *settings = http_argbyname(rq, "settings");
 698     int version = get_version(rq);
 699     ht = get_hitsbytarget(s->psession, &count, c->nmem);
 700     if (!cmd_status)
 701         /* Old protocol, always ok */
 702         response_open(c, "bytarget");
 703     else {
 704         /* New protocol, OK or WARNING (...)*/
 705         response_open_no_status(c, "bytarget");
 706         wrbuf_printf(c->wrbuf, "<status>%s</status>", cmd_status);
 707     }
 708
 709     if (count == 0)
 710         yaz_log(YLOG_WARN, "Empty bytarget Response. No targets found!");
 711     for (i = 0; i < count; i++)
 712     {
 713         wrbuf_puts(c->wrbuf, "\n<target>");
 714
 715         wrbuf_puts(c->wrbuf, "<id>");
 716         wrbuf_xmlputs(c->wrbuf, ht[i].id);
 717         wrbuf_puts(c->wrbuf, "</id>\n");
 718
 719         if (ht[i].name && ht[i].name[0])
 720         {
 721             wrbuf_puts(c->wrbuf, "<name>");
 722             wrbuf_xmlputs(c->wrbuf, ht[i].name);
 723             wrbuf_puts(c->wrbuf, "</name>\n");
 724         }
 725
 726         wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", ht[i].hits);
 727         wrbuf_printf(c->wrbuf, "<diagnostic>%d</diagnostic>\n", ht[i].diagnostic);
 728         if (ht[i].diagnostic)
 729         {
 730             wrbuf_puts(c->wrbuf, "<message>");
 731             wrbuf_xmlputs(c->wrbuf, ht[i].message);
 732             wrbuf_puts(c->wrbuf, "</message>\n");
 733             wrbuf_puts(c->wrbuf, "<addinfo>");
 734             if (ht[i].addinfo)
 735                 wrbuf_xmlputs(c->wrbuf, ht[i].addinfo);
 736             wrbuf_puts(c->wrbuf, "</addinfo>\n");
 737         }
 738
 739         wrbuf_printf(c->wrbuf, "<records>%d</records>\n", ht[i].records - ht[i].filtered);
 740         if (version >= 2) {
 741             wrbuf_printf(c->wrbuf, "<filtered>%d</filtered>\n", ht[i].filtered);
 742             wrbuf_printf(c->wrbuf, "<approximation>" ODR_INT_PRINTF "</approximation>\n", ht[i].approximation);
 743         }
 744         wrbuf_puts(c->wrbuf, "<state>");
 745         wrbuf_xmlputs(c->wrbuf, ht[i].state);
 746         wrbuf_puts(c->wrbuf, "</state>\n");
 747         if (settings && *settings == '1')
 748         {
 749             wrbuf_puts(c->wrbuf, "<settings>\n");
 750             wrbuf_puts(c->wrbuf, ht[i].settings_xml);
 751             wrbuf_puts(c->wrbuf, "</settings>\n");
 752         }
 753         if (ht[i].suggestions_xml && ht[i].suggestions_xml[0]) {
 754             wrbuf_puts(c->wrbuf, "<suggestions>");
 755             wrbuf_puts(c->wrbuf, ht[i].suggestions_xml);
 756             wrbuf_puts(c->wrbuf, "</suggestions>");
 757         }
 758         wrbuf_puts(c->wrbuf, "</target>");
 759     }
 760     response_close(c, "bytarget");
 761 }
 762
 763 static void bytarget_result_ready(void *data)
 764 {
 765     struct http_channel *c = (struct http_channel *) data;
 766     struct http_session *s = locate_session(c);
 767     const char *status_message = "OK";
 768     if (s) {
 769         yaz_log(c->http_sessions->log_level, "Session %u: bytarget watch released", s->session_id);
 770         bytarget_response(c, s, status_message);
 771         release_session(c, s);
 772     }
 773     else {
 774         yaz_log(c->http_sessions->log_level, "No Session found for released bytarget watch");
 775     }
 776 }
 777
 778
 779 static void cmd_bytarget(struct http_channel *c)
 780 {
 781     struct http_request *rq = c->request;
 782     struct http_response *rs = c->response;
 783     struct http_session *s = locate_session(c);
 784     const char *block = http_argbyname(rq, "block");
 785     const char *report = http_argbyname(rq, "report");
 786     int report_error = 0;
 787     int report_status = 0;
 788     const char *status_message = "OK";
 789     int no_active;
 790
 791     if (report && !strcmp("error", report)) {
 792         report_error = 1;
 793     }
 794     if (report && !strcmp("status", report)) {
 795         report_status = 1;
 796     }
 797
 798     if (!s)
 799         return;
 800
 801     no_active = session_active_clients(s->psession);
 802     if (block && !strcmp("1",block) && no_active)
 803     {
 804         // if there is already a watch/block. we do not block this one
 805         if (session_set_watch(s->psession, SESSION_WATCH_BYTARGET,
 806                               bytarget_result_ready, c, c) != 0)
 807         {
 808             yaz_log(YLOG_WARN, "Session %u: Attempt to block multiple times on bytarget block. Not supported!", s->session_id);
 809             if (report_error) {
 810                 error(rs, PAZPAR2_ALREADY_BLOCKED, "bytarget");
 811                 release_session(c, s);
 812                 return;
 813             }
 814             else if (report_status) {
 815                 status_message = "WARNING (Already blocked on bytarget)";
 816             }
 817             else {
 818                 yaz_log(YLOG_WARN, "Session %u: Ignoring bytarget block. Return current result.", s->session_id);
 819             }
 820         }
 821         else
 822         {
 823             yaz_log(c->http_sessions->log_level, "Session %u: Blocking on command bytarget", s->session_id);
 824             release_session(c, s);
 825             return;
 826         }
 827     }
 828     session_enter_ro(s->psession, "cmd_bytarget");
 829     bytarget_response(c, s, status_message);
 830     session_leave_ro(s->psession, "cmd_bytarget");
 831     release_session(c, s);
 832 }
 833
 834 static void write_metadata(WRBUF w, struct conf_service *service,
 835                            struct record_metadata **ml, int full, int indent)
 836 {
 837     int imeta;
 838
 839     for (imeta = 0; imeta < service->num_metadata; imeta++)
 840     {
 841         struct conf_metadata *cmd = &service->metadata[imeta];
 842         struct record_metadata *md;
 843         if (!cmd->brief && !full)
 844             continue;
 845         for (md = ml[imeta]; md; md = md->next)
 846         {
 847             struct record_metadata_attr *attr = md->attributes;
 848             int i;
 849             for (i = 0; i < indent; i++)
 850                 wrbuf_putc(w, ' ');
 851             wrbuf_printf(w, "<md-%s", cmd->name);
 852
 853             for (; attr; attr = attr->next)
 854             {
 855                 wrbuf_printf(w, " %s=\"", attr->name);
 856                 wrbuf_xmlputs(w, attr->value);
 857                 wrbuf_puts(w, "\"");
 858             }
 859             wrbuf_puts(w, ">");
 860             switch (cmd->type)
 861             {
 862                 case Metadata_type_generic:
 863                     wrbuf_xmlputs(w, md->data.text.disp);
 864                     break;
 865                 case Metadata_type_year:
 866                     wrbuf_printf(w, "%d", md->data.number.min);
 867                     if (md->data.number.min != md->data.number.max)
 868                         wrbuf_printf(w, "-%d", md->data.number.max);
 869                     break;
 870                 default:
 871                     wrbuf_puts(w, "[can't represent]");
 872                     break;
 873             }
 874             wrbuf_printf(w, "</md-%s>\n", cmd->name);
 875         }
 876     }
 877 }
 878
 879 static void write_subrecord(struct record *r, WRBUF w,
 880         struct conf_service *service, int show_details)
 881 {
 882     const char *name = session_setting_oneval(
 883         client_get_database(r->client), PZ_NAME);
 884
 885     wrbuf_puts(w, " <location id=\"");
 886     wrbuf_xmlputs(w, client_get_id(r->client));
 887     wrbuf_puts(w, "\"\n");
 888
 889     wrbuf_puts(w, "    name=\"");
 890     wrbuf_xmlputs(w,  *name ? name : "Unknown");
 891     wrbuf_puts(w, "\" ");
 892
 893     wrbuf_puts(w, "checksum=\"");
 894     wrbuf_printf(w,  "%u", r->checksum);
 895     wrbuf_puts(w, "\">\n");
 896
 897     write_metadata(w, service, r->metadata, show_details, 2);
 898     wrbuf_puts(w, " </location>\n");
 899 }
 900
 901 static void show_raw_record_error(void *data, const char *addinfo)
 902 {
 903     http_channel_observer_t obs = data;
 904     struct http_channel *c = http_channel_observer_chan(obs);
 905     struct http_response *rs = c->response;
 906
 907     http_remove_observer(obs);
 908
 909     error(rs, PAZPAR2_RECORD_FAIL, addinfo);
 910 }
 911
 912 static void show_raw_record_ok(void *data, const char *buf, size_t sz)
 913 {
 914     http_channel_observer_t obs = data;
 915     struct http_channel *c = http_channel_observer_chan(obs);
 916     struct http_response *rs = c->response;
 917
 918     http_remove_observer(obs);
 919
 920     wrbuf_write(c->wrbuf, buf, sz);
 921     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 922     http_send_response(c);
 923 }
 924
 925
 926 static void show_raw_record_ok_binary(void *data, const char *buf, size_t sz)
 927 {
 928     http_channel_observer_t obs = data;
 929     struct http_channel *c = http_channel_observer_chan(obs);
 930     struct http_response *rs = c->response;
 931
 932     http_remove_observer(obs);
 933
 934     wrbuf_write(c->wrbuf, buf, sz);
 935     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 936
 937     rs->content_type = "application/octet-stream";
 938     http_send_response(c);
 939 }
 940
 941
 942 void show_raw_reset(void *data, struct http_channel *c, void *data2)
 943 {
 944     //struct client *client = data;
 945     //client_show_raw_remove(client, data2);
 946 }
 947
 948 static void cmd_record_ready(void *data);
 949
 950 static void show_record(struct http_channel *c, struct http_session *s)
 951 {
 952     struct http_response *rs = c->response;
 953     struct http_request *rq = c->request;
 954     struct record_cluster *rec, *prev_r, *next_r;
 955     struct conf_service *service;
 956     const char *idstr = http_argbyname(rq, "id");
 957     const char *offsetstr = http_argbyname(rq, "offset");
 958     const char *binarystr = http_argbyname(rq, "binary");
 959     const char *checksumstr = http_argbyname(rq, "checksum");
 960
 961     if (!s)
 962         return;
 963     service = s->psession->service;
 964     if (!idstr)
 965     {
 966         error(rs, PAZPAR2_MISSING_PARAMETER, "id");
 967         return;
 968     }
 969     wrbuf_rewind(c->wrbuf);
 970     if (!(rec = show_single_start(s->psession, idstr, &prev_r, &next_r)))
 971     {
 972         if (session_active_clients(s->psession) == 0)
 973         {
 974             error(rs, PAZPAR2_RECORD_MISSING, idstr);
 975         }
 976         else if (session_set_watch(s->psession, SESSION_WATCH_RECORD,
 977                               cmd_record_ready, c, c) != 0)
 978         {
 979             error(rs, PAZPAR2_RECORD_MISSING, idstr);
 980         }
 981         return;
 982     }
 983     if (offsetstr || checksumstr)
 984     {
 985         const char *syntax = http_argbyname(rq, "syntax");
 986         const char *esn = http_argbyname(rq, "esn");
 987         int i;
 988         struct record*r = rec->records;
 989         int binary = 0;
 990         const char *nativesyntax = http_argbyname(rq, "nativesyntax");
 991
 992         if (binarystr && *binarystr != '0')
 993             binary = 1;
 994
 995         if (checksumstr)
 996         {
 997             long v = atol(checksumstr);
 998             for (i = 0; r; r = r->next)
 999                 if (v == r->checksum)
1000                     break;
1001             if (!r)
1002                 error(rs, PAZPAR2_RECORD_FAIL, "no record");
1003         }
1004         else
1005         {
1006             int offset = atoi(offsetstr);
1007             for (i = 0; i < offset && r; r = r->next, i++)
1008                 ;
1009             if (!r)
1010                 error(rs, PAZPAR2_RECORD_FAIL, "no record at offset given");
1011         }
1012         if (r)
1013         {
1014             http_channel_observer_t obs =
1015                 http_add_observer(c, r->client, show_raw_reset);
1016             int ret = client_show_raw_begin(r->client, r->position,
1017                                             syntax, esn,
1018                                             obs /* data */,
1019                                             show_raw_record_error,
1020                                             (binary ?
1021                                              show_raw_record_ok_binary :
1022                                              show_raw_record_ok),
1023                                             (binary ? 1 : 0),
1024                                             nativesyntax);
1025             if (ret == -1)
1026             {
1027                 http_remove_observer(obs);
1028                 error(rs, PAZPAR2_NO_SESSION, 0);
1029             }
1030         }
1031     }
1032     else
1033     {
1034         struct record *r;
1035         response_open_no_status(c, "record");
1036         wrbuf_puts(c->wrbuf, "\n <recid>");
1037         wrbuf_xmlputs(c->wrbuf, rec->recid);
1038         wrbuf_puts(c->wrbuf, "</recid>\n");
1039         if (prev_r)
1040         {
1041             wrbuf_puts(c->wrbuf, " <prevrecid>");
1042             wrbuf_xmlputs(c->wrbuf, prev_r->recid);
1043             wrbuf_puts(c->wrbuf, "</prevrecid>\n");
1044         }
1045         if (next_r)
1046         {
1047             wrbuf_puts(c->wrbuf, " <nextrecid>");
1048             wrbuf_xmlputs(c->wrbuf, next_r->recid);
1049             wrbuf_puts(c->wrbuf, "</nextrecid>\n");
1050         }
1051         wrbuf_printf(c->wrbuf, " <activeclients>%d</activeclients>\n",
1052                      session_active_clients(s->psession));
1053         write_metadata(c->wrbuf, service, rec->metadata, 1, 1);
1054         for (r = rec->records; r; r = r->next)
1055             write_subrecord(r, c->wrbuf, service, 2);
1056         response_close(c, "record");
1057     }
1058     show_single_stop(s->psession, rec);
1059 }
1060
1061 static void cmd_record_ready(void *data)
1062 {
1063     struct http_channel *c = (struct http_channel *) data;
1064     struct http_session *s = locate_session(c);
1065     if (s) {
1066         yaz_log(c->http_sessions->log_level, "Session %u: record watch released", s->session_id);
1067         show_record(c, s);
1068         release_session(c,s);
1069     }
1070 }
1071
1072 static void cmd_record(struct http_channel *c)
1073 {
1074     struct http_session *s = locate_session(c);
1075     if (s) {
1076         show_record(c, s);
1077         release_session(c,s);
1078     }
1079 }
1080
1081
1082 static void show_records(struct http_channel *c, struct http_session *s, int active)
1083 {
1084     struct http_request *rq = c->request;
1085     struct http_response *rs = c->response;
1086     struct record_cluster **rl;
1087     struct reclist_sortparms *sp;
1088     const char *start = http_argbyname(rq, "start");
1089     const char *num = http_argbyname(rq, "num");
1090     const char *sort = http_argbyname(rq, "sort");
1091     int version = get_version(rq);
1092
1093     int startn = 0;
1094     int numn = 20;
1095     int total;
1096     Odr_int total_hits;
1097     Odr_int approx_hits;
1098     int i;
1099     struct conf_service *service = 0;
1100     if (!s)
1101         return;
1102
1103     // We haven't counted clients yet if we're called on a block release
1104     if (active < 0)
1105         active = session_active_clients(s->psession);
1106
1107     if (start)
1108         startn = atoi(start);
1109     if (num)
1110         numn = atoi(num);
1111
1112     service = s->psession->service;
1113     if (!sort) {
1114         sort = service->default_sort;
1115     }
1116     if (!(sp = reclist_parse_sortparms(c->nmem, sort, service)))
1117     {
1118         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1119         return;
1120     }
1121
1122     rl = show_range_start(s->psession, sp, startn, &numn, &total, &total_hits, &approx_hits);
1123
1124     response_open(c, "show");
1125     wrbuf_printf(c->wrbuf, "\n<activeclients>%d</activeclients>\n", active);
1126     wrbuf_printf(c->wrbuf, "<merged>%d</merged>\n", total);
1127     wrbuf_printf(c->wrbuf, "<total>" ODR_INT_PRINTF "</total>\n", total_hits);
1128     if (version >= 2) {
1129         wrbuf_printf(c->wrbuf, "<approximation>" ODR_INT_PRINTF "</approximation>\n", approx_hits);
1130     }
1131     wrbuf_printf(c->wrbuf, "<start>%d</start>\n", startn);
1132     wrbuf_printf(c->wrbuf, "<num>%d</num>\n", numn);
1133
1134     for (i = 0; i < numn; i++)
1135     {
1136         int ccount;
1137         struct record *p;
1138         struct record_cluster *rec = rl[i];
1139         struct conf_service *service = s->psession->service;
1140
1141         wrbuf_puts(c->wrbuf, "<hit>\n");
1142         write_metadata(c->wrbuf, service, rec->metadata, 0, 1);
1143         for (ccount = 0, p = rl[i]->records; p;  p = p->next, ccount++)
1144             write_subrecord(p, c->wrbuf, service, 0); // subrecs w/o details
1145         wrbuf_printf(c->wrbuf, " <count>%d</count>\n", ccount);
1146         if (strstr(sort, "relevance"))
1147         {
1148             wrbuf_printf(c->wrbuf, " <relevance>%d</relevance>\n",
1149                          rec->relevance_score);
1150             if (service->rank_debug)
1151             {
1152                 wrbuf_printf(c->wrbuf, " <relevance_info>\n");
1153                 wrbuf_xmlputs(c->wrbuf, wrbuf_cstr(rec->relevance_explain1));
1154                 wrbuf_xmlputs(c->wrbuf, wrbuf_cstr(rec->relevance_explain2));
1155                 wrbuf_printf(c->wrbuf, " </relevance_info>\n");
1156             }
1157         }
1158         wrbuf_puts(c->wrbuf, " <recid>");
1159         wrbuf_xmlputs(c->wrbuf, rec->recid);
1160         wrbuf_puts(c->wrbuf, "</recid>\n");
1161         wrbuf_puts(c->wrbuf, "</hit>\n");
1162     }
1163
1164     show_range_stop(s->psession, rl);
1165     response_close(c, "show");
1166 }
1167
1168 static void show_records_ready(void *data)
1169 {
1170     struct http_channel *c = (struct http_channel *) data;
1171     struct http_session *s = locate_session(c);
1172     if (s) {
1173         yaz_log(c->http_sessions->log_level, "Session %u: show watch released", s->session_id);
1174         show_records(c, s, -1);
1175     }
1176     else {
1177         /* some error message  */
1178     }
1179     release_session(c,s);
1180 }
1181
1182 static void cmd_show(struct http_channel *c)
1183 {
1184     struct http_request  *rq = c->request;
1185     struct http_response *rs = c->response;
1186     struct http_session *s = locate_session(c);
1187     const char *block = http_argbyname(rq, "block");
1188     const char *sort = http_argbyname(rq, "sort");
1189     const char *block_error = http_argbyname(rq, "report");
1190     struct conf_service *service = 0;
1191
1192     struct reclist_sortparms *sp;
1193     int status;
1194     int report_error = 0;
1195     if (block_error && !strcmp("1", block_error)) {
1196         report_error = 1;
1197     }
1198     if (!s)
1199         return;
1200
1201     service = s->psession->service;
1202     if (!sort) {
1203         sort = service->default_sort;
1204     }
1205
1206     if (!(sp = reclist_parse_sortparms(c->nmem, sort, service)))
1207     {
1208         error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1209         release_session(c, s);
1210         return;
1211     }
1212     session_sort(s->psession, sp);
1213
1214     status = session_active_clients(s->psession);
1215
1216     if (block)
1217     {
1218         if (!strcmp(block, "preferred") && !session_is_preferred_clients_ready(s->psession) && reclist_get_num_records(s->psession->reclist) == 0)
1219         {
1220             // if there is already a watch/block. we do not block this one
1221             if (session_set_watch(s->psession, SESSION_WATCH_SHOW_PREF,
1222                                   show_records_ready, c, c) == 0)
1223             {
1224                 yaz_log(c->http_sessions->log_level,
1225                         "Session %u: Blocking on command show (preferred targets)", s->session_id);
1226                 release_session(c, s);
1227                 return;
1228             }
1229             else
1230             {
1231                 yaz_log(YLOG_WARN, "Session %u: Attempt to block multiple times on show (preferred targets) block. Not supported!",
1232                     s->session_id);
1233                 if (report_error) {
1234                     error(rs, PAZPAR2_ALREADY_BLOCKED, "show (preferred targets)");
1235                     release_session(c, s);
1236                     return;
1237                 }
1238                 else {
1239                     yaz_log(YLOG_WARN, "Session %u: Ignoring show(preferred) block. Returning current result.", s->session_id);
1240                 }
1241             }
1242
1243         }
1244         else if (status)
1245         {
1246             // if there is already a watch/block. we do not block this one
1247             if (session_set_watch(s->psession, SESSION_WATCH_SHOW,
1248                                   show_records_ready, c, c) != 0)
1249             {
1250                 yaz_log(YLOG_WARN, "Session %u: Attempt to block multiple times on show block. Not supported!", s->session_id);
1251                 if (report_error) {
1252                     error(rs, PAZPAR2_ALREADY_BLOCKED, "show");
1253                     release_session(c, s);
1254                     return;
1255                 }
1256                 else {
1257                     yaz_log(YLOG_WARN, "Session %u: Ignoring show block. Returning current result.", s->session_id);
1258                 }
1259             }
1260             else
1261             {
1262                 yaz_log(c->http_sessions->log_level, "Session %u: Blocking on command show", s->session_id);
1263                 release_session(c, s);
1264                 return;
1265             }
1266         }
1267     }
1268     session_enter_ro(s->psession, "show_records");
1269     show_records(c, s, status);
1270     session_leave_ro(s->psession, "show_records");
1271     release_session(c, s);
1272 }
1273
1274 static void cmd_ping(struct http_channel *c)
1275 {
1276     struct http_session *s = locate_session(c);
1277     if (!s)
1278         return;
1279     response_open(c, "ping");
1280     response_close(c, "ping");
1281     release_session(c, s);
1282 }
1283
1284 static void cmd_search(struct http_channel *c)
1285 {
1286     struct http_request *rq = c->request;
1287     struct http_response *rs = c->response;
1288     struct http_session *s = locate_session(c);
1289     const char *query = http_argbyname(rq, "query");
1290     const char *filter = http_argbyname(rq, "filter");
1291     const char *maxrecs = http_argbyname(rq, "maxrecs");
1292     const char *startrecs = http_argbyname(rq, "startrecs");
1293     const char *limit = http_argbyname(rq, "limit");
1294     const char *sort = http_argbyname(rq, "sort");
1295     enum pazpar2_error_code code;
1296     const char *addinfo = 0;
1297     struct reclist_sortparms *sp;
1298     struct conf_service *service = 0;
1299
1300     if (!s)
1301         return;
1302
1303     if (!query)
1304     {
1305         error(rs, PAZPAR2_MISSING_PARAMETER, "query");
1306         release_session(c, s);
1307         return;
1308     }
1309     if (!yaz_utf8_check(query))
1310     {
1311         error(rs, PAZPAR2_MALFORMED_PARAMETER_ENCODING, "query");
1312         release_session(c, s);
1313         return;
1314     }
1315     service = s->psession->service;
1316     if (!sort) {
1317         sort = service->default_sort;
1318     }
1319     if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
1320     {
1321         error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1322         release_session(c, s);
1323         return;
1324     }
1325
1326     code = session_search(s->psession, query, startrecs, maxrecs, filter, limit,
1327                           &addinfo, sp);
1328     if (code)
1329     {
1330         error(rs, code, addinfo);
1331         release_session(c, s);
1332         return;
1333     }
1334     response_open(c, "search");
1335     response_close(c, "search");
1336     release_session(c, s);
1337 }
1338
1339
1340 static void cmd_stat(struct http_channel *c)
1341 {
1342     struct http_session *s = locate_session(c);
1343     struct statistics stat;
1344     int clients;
1345
1346     float progress = 0;
1347
1348     if (!s)
1349         return;
1350
1351     clients = session_active_clients(s->psession);
1352     statistics(s->psession, &stat);
1353
1354     if (stat.num_clients > 0)
1355     {
1356         progress = (stat.num_clients  - clients) / (float)stat.num_clients;
1357     }
1358
1359     response_open_no_status(c, "stat");
1360     wrbuf_printf(c->wrbuf, "\n <activeclients>%d</activeclients>\n", clients);
1361     wrbuf_printf(c->wrbuf, " <hits>" ODR_INT_PRINTF "</hits>\n", stat.num_hits);
1362     wrbuf_printf(c->wrbuf, " <records>%d</records>\n", stat.num_records);
1363     wrbuf_printf(c->wrbuf, " <clients>%d</clients>\n", stat.num_clients);
1364     wrbuf_printf(c->wrbuf, " <unconnected>%d</unconnected>\n", stat.num_no_connection);
1365     wrbuf_printf(c->wrbuf, " <connecting>%d</connecting>\n", stat.num_connecting);
1366     wrbuf_printf(c->wrbuf, " <working>%d</working>\n", stat.num_working);
1367     wrbuf_printf(c->wrbuf, " <idle>%d</idle>\n", stat.num_idle);
1368     wrbuf_printf(c->wrbuf, " <failed>%d</failed>\n", stat.num_failed);
1369     wrbuf_printf(c->wrbuf, " <error>%d</error>\n", stat.num_error);
1370     wrbuf_printf(c->wrbuf, " <progress>%.2f</progress>\n", progress);
1371     response_close(c, "stat");
1372     release_session(c, s);
1373 }
1374
1375 static void cmd_info(struct http_channel *c)
1376 {
1377     char yaz_version_str[20];
1378     char yaz_sha1_str[42];
1379
1380     response_open_no_status(c, "info");
1381     wrbuf_puts(c->wrbuf, "\n <version>\n");
1382     wrbuf_puts(c->wrbuf, "  <pazpar2");
1383 #ifdef PAZPAR2_VERSION_SHA1
1384     wrbuf_printf(c->wrbuf, " sha1=\"%s\"", PAZPAR2_VERSION_SHA1);
1385 #endif
1386     wrbuf_puts(c->wrbuf, ">");
1387     wrbuf_xmlputs(c->wrbuf, VERSION);
1388     wrbuf_puts(c->wrbuf, "</pazpar2>\n");
1389
1390     yaz_version(yaz_version_str, yaz_sha1_str);
1391     wrbuf_puts(c->wrbuf, "  <yaz compiled=\"");
1392     wrbuf_xmlputs(c->wrbuf, YAZ_VERSION);
1393     wrbuf_puts(c->wrbuf, "\" sha1=\"");
1394     wrbuf_xmlputs(c->wrbuf, yaz_sha1_str);
1395     wrbuf_puts(c->wrbuf, "\">");
1396     wrbuf_xmlputs(c->wrbuf, yaz_version_str);
1397     wrbuf_puts(c->wrbuf, "</yaz>\n");
1398
1399     wrbuf_puts(c->wrbuf, " </version>\n");
1400 #if HAVE_UNISTD_H
1401     {
1402         char hostname_str[64];
1403         if (gethostname(hostname_str, sizeof(hostname_str)) == 0)
1404         {
1405             wrbuf_puts(c->wrbuf, " <host>");
1406             wrbuf_xmlputs(c->wrbuf, hostname_str);
1407             wrbuf_puts(c->wrbuf, "</host>\n");
1408         }
1409     }
1410 #endif
1411     info_services(c->server, c->wrbuf);
1412
1413     response_close(c, "info");
1414 }
1415
1416 struct {
1417     char *name;
1418     void (*fun)(struct http_channel *c);
1419 } commands[] = {
1420     { "init", cmd_init },
1421     { "settings", cmd_settings },
1422     { "stat", cmd_stat },
1423     { "bytarget", cmd_bytarget },
1424     { "show", cmd_show },
1425     { "search", cmd_search },
1426     { "termlist", cmd_termlist },
1427     { "exit", cmd_exit },
1428     { "session-status", cmd_session_status },
1429     { "server-status", cmd_server_status },
1430     { "ping", cmd_ping },
1431     { "record", cmd_record },
1432     { "info", cmd_info },
1433     {0,0}
1434 };
1435
1436 void http_command(struct http_channel *c)
1437 {
1438     const char *command = http_argbyname(c->request, "command");
1439     struct http_response *rs = http_create_response(c);
1440     int i;
1441
1442     c->response = rs;
1443
1444     http_addheader(rs, "Expires", "Thu, 19 Nov 1981 08:52:00 GMT");
1445     http_addheader(rs, "Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
1446
1447     if (!command)
1448     {
1449         error(rs, PAZPAR2_MISSING_PARAMETER, "command");
1450         return;
1451     }
1452     for (i = 0; commands[i].name; i++)
1453         if (!strcmp(commands[i].name, command))
1454         {
1455             (*commands[i].fun)(c);
1456             break;
1457         }
1458     if (!commands[i].name)
1459         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "command");
1460
1461     return;
1462 }
1463
1464 /*
1465  * Local variables:
1466  * c-basic-offset: 4
1467  * c-file-style: "Stroustrup"
1468  * indent-tabs-mode: nil
1469  * End:
1470  * vim: shiftwidth=4 tabstop=8 expandtab
1471  */
1472