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 static void show_records_ready(void *data);
  97
  98 int get_version(struct http_request *rq) {
  99     const char *version = http_argbyname(rq, "version");
 100     int version_no = 0;
 101     if (version && strcmp(version, "")) {
 102         version_no = atoi(version);
 103     }
 104     return version_no;
 105 }
 106
 107
 108 int http_session_use(int delta)
 109 {
 110     int sessions;
 111     if (!g_http_session_mutex)
 112         yaz_mutex_create(&g_http_session_mutex);
 113     yaz_mutex_enter(g_http_session_mutex);
 114     g_http_sessions += delta;
 115     sessions = g_http_sessions;
 116     yaz_mutex_leave(g_http_session_mutex);
 117     yaz_log(YLOG_DEBUG, "%s sessions=%d", delta == 0 ? "" : (delta > 0 ? "INC" : "DEC"), sessions);
 118     return sessions;
 119
 120 }
 121
 122 http_sessions_t http_sessions_create(void)
 123 {
 124     http_sessions_t hs = xmalloc(sizeof(*hs));
 125     hs->session_list = 0;
 126     hs->mutex = 0;
 127     pazpar2_mutex_create(&hs->mutex, "http_sessions");
 128     hs->log_level = yaz_log_module_level("HTTP");
 129     return hs;
 130 }
 131
 132 void http_sessions_destroy(http_sessions_t hs)
 133 {
 134     if (hs)
 135     {
 136         struct http_session *s = hs->session_list;
 137         while (s)
 138         {
 139             struct http_session *s_next = s->next;
 140             iochan_destroy(s->timeout_iochan);
 141             session_destroy(s->psession);
 142             nmem_destroy(s->nmem);
 143             s = s_next;
 144         }
 145         yaz_mutex_destroy(&hs->mutex);
 146         xfree(hs);
 147     }
 148 }
 149
 150 void http_session_destroy(struct http_session *s);
 151
 152 static void session_timeout(IOCHAN i, int event)
 153 {
 154     struct http_session *s = iochan_getdata(i);
 155     http_session_destroy(s);
 156 }
 157
 158 struct http_session *http_session_create(struct conf_service *service,
 159                                          http_sessions_t http_sessions,
 160                                          unsigned int sesid)
 161 {
 162     NMEM nmem = nmem_create();
 163     struct http_session *r = nmem_malloc(nmem, sizeof(*r));
 164     char tmp_str[50];
 165
 166     sprintf(tmp_str, "session#%u", sesid);
 167     r->psession = new_session(nmem, service, sesid);
 168     r->session_id = sesid;
 169     r->timestamp = 0;
 170     r->nmem = nmem;
 171     r->destroy_counter = r->activity_counter = 0;
 172     r->http_sessions = http_sessions;
 173
 174     yaz_mutex_enter(http_sessions->mutex);
 175     r->next = http_sessions->session_list;
 176     http_sessions->session_list = r;
 177     yaz_mutex_leave(http_sessions->mutex);
 178
 179     r->timeout_iochan = iochan_create(-1, session_timeout, 0,
 180                                       "http_session_timeout");
 181     iochan_setdata(r->timeout_iochan, r);
 182
 183     session_log(r->psession, http_sessions->log_level,
 184                 "HTTP session create. timeout chan=%p ses=%d",
 185                 r->timeout_iochan, service->session_timeout);
 186     iochan_settimeout(r->timeout_iochan, service->session_timeout);
 187
 188     iochan_add(service->server->iochan_man, r->timeout_iochan);
 189     http_session_use(1);
 190     return r;
 191 }
 192
 193 void http_session_destroy(struct http_session *s)
 194 {
 195     int must_destroy = 0;
 196
 197     http_sessions_t http_sessions = s->http_sessions;
 198
 199     session_log(s->psession, http_sessions->log_level,
 200                 "HTTP session destroy");
 201     yaz_mutex_enter(http_sessions->mutex);
 202     /* only if http_session has no active http sessions on it can be destroyed */
 203     if (s->destroy_counter == s->activity_counter)
 204     {
 205         struct http_session **p = 0;
 206         must_destroy = 1;
 207         for (p = &http_sessions->session_list; *p; p = &(*p)->next)
 208             if (*p == s)
 209             {
 210                 *p = (*p)->next;
 211                 break;
 212             }
 213     }
 214     yaz_mutex_leave(http_sessions->mutex);
 215     if (must_destroy)
 216     {   /* destroying for real */
 217         session_log(s->psession, http_sessions->log_level, "About to destroyd");
 218         iochan_destroy(s->timeout_iochan);
 219         session_destroy(s->psession);
 220         http_session_use(-1);
 221         nmem_destroy(s->nmem);
 222     }
 223     else
 224     {
 225         session_log(s->psession, http_sessions->log_level,
 226                     "Destroy delayed. Active clients (%d-%d)",
 227                     s->activity_counter, s->destroy_counter);
 228     }
 229
 230 }
 231
 232 static const char *get_msg(enum pazpar2_error_code code)
 233 {
 234     struct pazpar2_error_msg {
 235         enum pazpar2_error_code code;
 236         const char *msg;
 237     };
 238     static const struct pazpar2_error_msg ar[] = {
 239         { PAZPAR2_NO_SESSION, "Session does not exist or it has expired"},
 240         { PAZPAR2_MISSING_PARAMETER, "Missing parameter"},
 241         { PAZPAR2_MALFORMED_PARAMETER_VALUE, "Malformed parameter value"},
 242         { PAZPAR2_MALFORMED_PARAMETER_ENCODING, "Malformed parameter encoding"},
 243         { PAZPAR2_MALFORMED_SETTING, "Malformed setting argument"},
 244         { PAZPAR2_HITCOUNTS_FAILED, "Failed to retrieve hitcounts"},
 245         { PAZPAR2_RECORD_MISSING, "Record missing"},
 246         { PAZPAR2_NO_TARGETS, "No targets"},
 247         { PAZPAR2_CONFIG_TARGET, "Target cannot be configured"},
 248         { PAZPAR2_RECORD_FAIL, "Record command failed"},
 249         { PAZPAR2_NOT_IMPLEMENTED, "Not implemented"},
 250         { PAZPAR2_NO_SERVICE, "No service"},
 251         { PAZPAR2_ALREADY_BLOCKED, "Already blocked in session on: "},
 252         { PAZPAR2_LAST_ERROR, "Last error"},
 253         { 0, 0 }
 254     };
 255     int i = 0;
 256     while (ar[i].msg)
 257     {
 258         if (code == ar[i].code)
 259             return ar[i].msg;
 260         i++;
 261     }
 262     return "No error";
 263 }
 264
 265 static void error(struct http_response *rs,
 266                   enum pazpar2_error_code code,
 267                   const char *addinfo)
 268 {
 269     struct http_channel *c = rs->channel;
 270     WRBUF text = wrbuf_alloc();
 271     const char *http_status = "417";
 272     const char *msg = get_msg(code);
 273
 274     rs->msg = nmem_strdup(c->nmem, msg);
 275     strcpy(rs->code, http_status);
 276
 277     wrbuf_printf(text, HTTP_COMMAND_RESPONSE_PREFIX "<error code=\"%d\" msg=\"%s\">", (int) code,
 278                msg);
 279     if (addinfo)
 280         wrbuf_xmlputs(text, addinfo);
 281     wrbuf_puts(text, "</error>");
 282
 283     yaz_log(YLOG_WARN, "HTTP %s %s%s%s", http_status,
 284             msg, addinfo ? ": " : "" , addinfo ? addinfo : "");
 285     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(text));
 286     wrbuf_destroy(text);
 287     http_send_response(c);
 288 }
 289
 290 static void response_open_no_status(struct http_channel *c, const char *command)
 291 {
 292     wrbuf_rewind(c->wrbuf);
 293     wrbuf_printf(c->wrbuf, "%s<%s>",
 294                  HTTP_COMMAND_RESPONSE_PREFIX, command);
 295 }
 296
 297 static void response_open(struct http_channel *c, const char *command)
 298 {
 299     response_open_no_status(c, command);
 300     wrbuf_puts(c->wrbuf, "<status>OK</status>");
 301 }
 302
 303 static void response_close(struct http_channel *c, const char *command)
 304 {
 305     struct http_response *rs = c->response;
 306
 307     wrbuf_printf(c->wrbuf, "</%s>", command);
 308     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 309     http_send_response(c);
 310 }
 311
 312 unsigned int make_sessionid(void)
 313 {
 314     static int seq = 0; /* thread pr */
 315     unsigned int res;
 316
 317     seq++;
 318     if (global_parameters.predictable_sessions)
 319         res = seq;
 320     else
 321     {
 322 #ifdef WIN32
 323         res = seq;
 324 #else
 325         struct timeval t;
 326
 327         if (gettimeofday(&t, 0) < 0)
 328         {
 329             yaz_log(YLOG_WARN|YLOG_ERRNO, "gettimeofday");
 330             exit(1);
 331         }
 332         /* at most 256 sessions per second ..
 333            (long long would be more appropriate)*/
 334         res = t.tv_sec;
 335         res = ((res << 8) | (seq & 0xff)) & ((1U << 31) - 1);
 336 #endif
 337     }
 338     return res;
 339 }
 340
 341 static struct http_session *locate_session(struct http_channel *c)
 342 {
 343     struct http_request *rq = c->request;
 344     struct http_response *rs = c->response;
 345     struct http_session *p;
 346     const char *session = http_argbyname(rq, "session");
 347     http_sessions_t http_sessions = c->http_sessions;
 348     unsigned int id;
 349
 350     if (!session)
 351     {
 352         error(rs, PAZPAR2_MISSING_PARAMETER, "session");
 353         return 0;
 354     }
 355     id = atoi(session);
 356     yaz_mutex_enter(http_sessions->mutex);
 357     for (p = http_sessions->session_list; p; p = p->next)
 358         if (id == p->session_id)
 359             break;
 360     if (p)
 361         p->activity_counter++;
 362     yaz_mutex_leave(http_sessions->mutex);
 363     if (p)
 364         iochan_activity(p->timeout_iochan);
 365     else
 366         error(rs, PAZPAR2_NO_SESSION, session);
 367     return p;
 368 }
 369
 370 // Call after use of locate_session, in order to increment the destroy_counter
 371 static void release_session(struct http_channel *c,
 372                             struct http_session *session)
 373 {
 374     http_sessions_t http_sessions = c->http_sessions;
 375     yaz_mutex_enter(http_sessions->mutex);
 376     if (session)
 377         session->destroy_counter++;
 378     yaz_mutex_leave(http_sessions->mutex);
 379 }
 380
 381 // Decode settings parameters and apply to session
 382 // Syntax: setting[target]=value
 383 static int process_settings(struct session *se, struct http_request *rq,
 384                             struct http_response *rs)
 385 {
 386     struct http_argument *a;
 387
 388     for (a = rq->arguments; a; a = a->next)
 389         if (strchr(a->name, '['))
 390         {
 391             char **res;
 392             int num;
 393             char *dbname;
 394             char *setting;
 395
 396             // Nmem_strsplit *rules*!!!
 397             nmem_strsplit(se->session_nmem, "[]", a->name, &res, &num);
 398             if (num != 2)
 399             {
 400                 error(rs, PAZPAR2_MALFORMED_SETTING, a->name);
 401                 return -1;
 402             }
 403             setting = res[0];
 404             dbname = res[1];
 405             session_apply_setting(se, dbname, setting,
 406                     nmem_strdup(se->session_nmem, a->value));
 407         }
 408     return 0;
 409 }
 410
 411 static void cmd_exit(struct http_channel *c)
 412 {
 413     yaz_log(YLOG_WARN, "exit");
 414
 415     response_open(c, "exit");
 416     response_close(c, "exit");
 417     if (global_parameters.debug_mode)
 418         http_close_server(c->server);
 419 }
 420
 421 static void cmd_init(struct http_channel *c)
 422 {
 423     struct http_request *r = c->request;
 424     const char *clear = http_argbyname(r, "clear");
 425     const char *content_type = http_lookup_header(r->headers, "Content-Type");
 426     unsigned int sesid;
 427     struct http_session *s;
 428     struct http_response *rs = c->response;
 429     struct conf_service *service = 0; /* no service (yet) */
 430
 431     if (r->content_len && content_type &&
 432         !yaz_strcmp_del("text/xml", content_type, "; "))
 433     {
 434         xmlDoc *doc = xmlParseMemory(r->content_buf, r->content_len);
 435         xmlNode *root_n;
 436         if (!doc)
 437         {
 438             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 439             return;
 440         }
 441         root_n = xmlDocGetRootElement(doc);
 442         service = service_create(c->server, root_n);
 443         xmlFreeDoc(doc);
 444         if (!service)
 445         {
 446             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 447             return;
 448         }
 449     }
 450
 451     if (!service)
 452     {
 453         const char *service_name = http_argbyname(c->request, "service");
 454         service = locate_service(c->server, service_name);
 455         if (!service)
 456         {
 457             error(rs, PAZPAR2_NO_SERVICE, service_name ? service_name : "unnamed");
 458             return;
 459         }
 460     }
 461     sesid = make_sessionid();
 462     s = http_session_create(service, c->http_sessions, sesid);
 463
 464     if (!clear || *clear == '0')
 465         session_init_databases(s->psession);
 466     else
 467         session_log(s->psession, YLOG_LOG, "No databases preloaded");
 468
 469     if (process_settings(s->psession, c->request, c->response) < 0)
 470         return;
 471
 472     response_open(c, "init");
 473     wrbuf_printf(c->wrbuf, "<session>%d", sesid);
 474     if (c->server->server_id)
 475     {
 476         wrbuf_puts(c->wrbuf, ".");
 477         wrbuf_puts(c->wrbuf, c->server->server_id);
 478     }
 479     wrbuf_puts(c->wrbuf, "</session>"
 480                "<protocol>" PAZPAR2_PROTOCOL_VERSION "</protocol>");
 481
 482     wrbuf_printf(c->wrbuf, "<keepAlive>%d</keepAlive>\n", 1000 * ((s->psession->service->session_timeout >= 20) ?
 483                                                                   (s->psession->service->session_timeout - 10) : 50));
 484     response_close(c, "init");
 485 }
 486
 487 static void apply_local_setting(void *client_data,
 488                                 struct setting *set)
 489 {
 490     struct session *se =  (struct session *) client_data;
 491
 492     session_apply_setting(se, nmem_strdup(se->session_nmem, set->target),
 493                           nmem_strdup(se->session_nmem, set->name),
 494                           nmem_strdup(se->session_nmem, set->value));
 495 }
 496
 497 static void cmd_settings(struct http_channel *c)
 498 {
 499     struct http_response *rs = c->response;
 500     struct http_request *rq = c->request;
 501     struct http_session *s = locate_session(c);
 502     const char *content_type = http_lookup_header(rq->headers, "Content-Type");
 503
 504     if (!s)
 505         return;
 506
 507     if (rq->content_len && content_type &&
 508         !yaz_strcmp_del("text/xml", content_type, "; "))
 509     {
 510         xmlDoc *doc = xmlParseMemory(rq->content_buf, rq->content_len);
 511         xmlNode *root_n;
 512         int ret;
 513         if (!doc)
 514         {
 515             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 516             release_session(c,s);
 517             return;
 518         }
 519         root_n = xmlDocGetRootElement(doc);
 520         ret = settings_read_node_x(root_n, s->psession, apply_local_setting);
 521         xmlFreeDoc(doc);
 522         if (ret)
 523         {
 524             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 525             release_session(c,s);
 526             return;
 527         }
 528     }
 529     if (process_settings(s->psession, rq, rs) < 0)
 530     {
 531         release_session(c, s);
 532         return;
 533     }
 534     response_open(c, "settings");
 535     response_close(c, "settings");
 536     release_session(c, s);
 537 }
 538
 539 static void termlist_response(struct http_channel *c, struct http_session *s, const char *cmd_status)
 540 {
 541     struct http_request *rq = c->request;
 542     const char *name    = http_argbyname(rq, "name");
 543     const char *nums    = http_argbyname(rq, "num");
 544     int version = get_version(rq);
 545     int num = 15;
 546     int status;
 547
 548     if (nums)
 549         num = atoi(nums);
 550
 551     status = session_active_clients(s->psession);
 552
 553     response_open_no_status(c, "termlist");
 554     /* new protocol add a status to response. Triggered by a status parameter */
 555     if (cmd_status != 0)
 556         wrbuf_printf(c->wrbuf, "<status>%s</status>\n", cmd_status);
 557     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", status);
 558
 559     perform_termlist(c, s->psession, name, num, version);
 560
 561     response_close(c, "termlist");
 562 }
 563
 564 static void termlist_result_ready(void *data)
 565 {
 566     struct http_channel *c = (struct http_channel *) data;
 567     struct http_request *rq = c->request;
 568     const char *report = http_argbyname(rq, "report");
 569     const char *status = 0;
 570     struct http_session *s = locate_session(c);
 571     if (report && !strcmp("status", report))
 572         status = "OK";
 573     if (s)
 574     {
 575         session_log(s->psession, c->http_sessions->log_level,
 576                     "termlist watch released");
 577         termlist_response(c, s, status);
 578         release_session(c,s);
 579     }
 580 }
 581
 582 static void cmd_termlist(struct http_channel *c)
 583 {
 584     struct http_request *rq = c->request;
 585     struct http_response *rs = c->response;
 586     struct http_session *s = locate_session(c);
 587     const char *block = http_argbyname(rq, "block");
 588     const char *report = http_argbyname(rq, "report");
 589     int report_status = 0;
 590     int report_error = 0;
 591     const char *status_message = 0;
 592     int active_clients;
 593
 594     if (report && !strcmp("error", report))
 595     {
 596         report_error = 1;
 597         status_message = "OK";
 598     }
 599     if (report && !strcmp("status", report))
 600     {
 601         report_status = 1;
 602         status_message = "OK";
 603     }
 604     if (!s)
 605         return;
 606
 607     active_clients = session_active_clients(s->psession);
 608     if (block && !strcmp("1", block) && active_clients)
 609     {
 610         // if there is already a watch/block. we do not block this one
 611         if (session_set_watch(s->psession, SESSION_WATCH_TERMLIST,
 612                               termlist_result_ready, c, c) != 0)
 613         {
 614             session_log(s->psession, YLOG_WARN, "Attempt to block "
 615                         "multiple times on termlist block. Not supported!");
 616             if (report_error) {
 617                 error(rs, PAZPAR2_ALREADY_BLOCKED, "termlist");
 618                 release_session(c, s);
 619                 return;
 620             }
 621             else if (report_status)
 622                 status_message = "WARNING (Already blocked on termlist)";
 623             else
 624                 session_log(s->psession, YLOG_WARN,
 625                             "Ignoring termlist block. Return current result");
 626         }
 627         else
 628         {
 629             session_log(s->psession, c->http_sessions->log_level,
 630                         "Blocking on command termlist");
 631             release_session(c, s);
 632             return;
 633         }
 634     }
 635
 636     termlist_response(c, s, status_message);
 637     release_session(c, s);
 638 }
 639
 640 size_t session_get_memory_status(struct session *session);
 641
 642 static void session_status(struct http_channel *c, struct http_session *s)
 643 {
 644     size_t session_nmem;
 645     wrbuf_printf(c->wrbuf, "<http_count>%u</http_count>\n", s->activity_counter);
 646     wrbuf_printf(c->wrbuf, "<http_nmem>%zu</http_nmem>\n", nmem_total(s->nmem) );
 647     session_nmem = session_get_memory_status(s->psession);
 648     wrbuf_printf(c->wrbuf, "<session_nmem>%zu</session_nmem>\n", session_nmem);
 649 }
 650
 651 static void cmd_service(struct http_channel *c)
 652 {
 653     struct http_session *s = locate_session(c);
 654     if (!s)
 655         return;
 656
 657     response_open(c, "service");
 658     response_close(c, "service");
 659     release_session(c, s);
 660 }
 661
 662 static void cmd_session_status(struct http_channel *c)
 663 {
 664     struct http_session *s = locate_session(c);
 665     if (!s)
 666         return;
 667
 668     response_open(c, "session-status");
 669     session_status(c, s);
 670     response_close(c, "session-status");
 671     release_session(c, s);
 672 }
 673
 674 int sessions_count(void);
 675 int clients_count(void);
 676 #ifdef HAVE_RESULTSETS_COUNT
 677 int resultsets_count(void);
 678 #else
 679 #define resultsets_count()      0
 680 #endif
 681
 682 static void cmd_server_status(struct http_channel *c)
 683 {
 684     int sessions   = sessions_count();
 685     int clients    = clients_count();
 686     int resultsets = resultsets_count();
 687
 688     response_open(c, "server-status");
 689     wrbuf_printf(c->wrbuf, "\n  <sessions>%u</sessions>\n", sessions);
 690     wrbuf_printf(c->wrbuf, "  <clients>%u</clients>\n",   clients);
 691     /* Only works if yaz has been compiled with enabling of this */
 692     wrbuf_printf(c->wrbuf, "  <resultsets>%u</resultsets>\n",resultsets);
 693     print_meminfo(c->wrbuf);
 694
 695 /* TODO add all sessions status                         */
 696 /*    http_sessions_t http_sessions = c->http_sessions; */
 697 /*    struct http_session *p;                           */
 698 /*
 699     yaz_mutex_enter(http_sessions->mutex);
 700     for (p = http_sessions->session_list; p; p = p->next)
 701     {
 702         p->activity_counter++;
 703         wrbuf_puts(c->wrbuf, "<session-status>\n");
 704         wrbuf_printf(c->wrbuf, "<id>%s</id>\n", p->session_id);
 705         yaz_mutex_leave(http_sessions->mutex);
 706         session_status(c, p);
 707         wrbuf_puts(c->wrbuf, "</session-status>\n");
 708         yaz_mutex_enter(http_sessions->mutex);
 709         p->activity_counter--;
 710     }
 711     yaz_mutex_leave(http_sessions->mutex);
 712 */
 713     response_close(c, "server-status");
 714     xmalloc_trav(0);
 715 }
 716
 717 static void bytarget_response(struct http_channel *c, struct http_session *s, const char *cmd_status) {
 718     int count, i;
 719     struct hitsbytarget *ht;
 720     struct http_request *rq = c->request;
 721     const char *settings = http_argbyname(rq, "settings");
 722     int version = get_version(rq);
 723     ht = get_hitsbytarget(s->psession, &count, c->nmem);
 724     if (!cmd_status)
 725         /* Old protocol, always ok */
 726         response_open(c, "bytarget");
 727     else {
 728         /* New protocol, OK or WARNING (...)*/
 729         response_open_no_status(c, "bytarget");
 730         wrbuf_printf(c->wrbuf, "<status>%s</status>", cmd_status);
 731     }
 732
 733     if (count == 0)
 734         session_log(s->psession, YLOG_WARN,
 735                     "Empty bytarget Response. No targets found!");
 736     for (i = 0; i < count; i++)
 737     {
 738         wrbuf_puts(c->wrbuf, "\n<target>");
 739
 740         wrbuf_puts(c->wrbuf, "<id>");
 741         wrbuf_xmlputs(c->wrbuf, ht[i].id);
 742         wrbuf_puts(c->wrbuf, "</id>\n");
 743
 744         if (ht[i].name && ht[i].name[0])
 745         {
 746             wrbuf_puts(c->wrbuf, "<name>");
 747             wrbuf_xmlputs(c->wrbuf, ht[i].name);
 748             wrbuf_puts(c->wrbuf, "</name>\n");
 749         }
 750
 751         wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", ht[i].hits);
 752         wrbuf_printf(c->wrbuf, "<diagnostic>%d</diagnostic>\n", ht[i].diagnostic);
 753         if (ht[i].diagnostic)
 754         {
 755             wrbuf_puts(c->wrbuf, "<message>");
 756             wrbuf_xmlputs(c->wrbuf, ht[i].message);
 757             wrbuf_puts(c->wrbuf, "</message>\n");
 758             wrbuf_puts(c->wrbuf, "<addinfo>");
 759             if (ht[i].addinfo)
 760                 wrbuf_xmlputs(c->wrbuf, ht[i].addinfo);
 761             wrbuf_puts(c->wrbuf, "</addinfo>\n");
 762         }
 763
 764         wrbuf_printf(c->wrbuf, "<records>%d</records>\n", ht[i].records - ht[i].filtered);
 765         if (version >= 2) {
 766             wrbuf_printf(c->wrbuf, "<filtered>%d</filtered>\n", ht[i].filtered);
 767             wrbuf_printf(c->wrbuf, "<approximation>" ODR_INT_PRINTF "</approximation>\n", ht[i].approximation);
 768         }
 769         wrbuf_puts(c->wrbuf, "<state>");
 770         wrbuf_xmlputs(c->wrbuf, ht[i].state);
 771         wrbuf_puts(c->wrbuf, "</state>\n");
 772         if (settings && *settings == '1')
 773         {
 774             wrbuf_puts(c->wrbuf, "<settings>\n");
 775             wrbuf_puts(c->wrbuf, ht[i].settings_xml);
 776             wrbuf_puts(c->wrbuf, "</settings>\n");
 777         }
 778         if (ht[i].suggestions_xml && ht[i].suggestions_xml[0]) {
 779             wrbuf_puts(c->wrbuf, "<suggestions>");
 780             wrbuf_puts(c->wrbuf, ht[i].suggestions_xml);
 781             wrbuf_puts(c->wrbuf, "</suggestions>");
 782         }
 783         wrbuf_puts(c->wrbuf, "</target>");
 784     }
 785     response_close(c, "bytarget");
 786 }
 787
 788 static void bytarget_result_ready(void *data)
 789 {
 790     struct http_channel *c = (struct http_channel *) data;
 791     struct http_session *s = locate_session(c);
 792     const char *status_message = "OK";
 793     if (s)
 794     {
 795         session_log(s->psession, c->http_sessions->log_level,
 796                     "bytarget watch released");
 797         bytarget_response(c, s, status_message);
 798         release_session(c, s);
 799     }
 800     else
 801         yaz_log(c->http_sessions->log_level,
 802                 "No Session found for released bytarget watch");
 803 }
 804
 805
 806 static void cmd_bytarget(struct http_channel *c)
 807 {
 808     struct http_request *rq = c->request;
 809     struct http_response *rs = c->response;
 810     struct http_session *s = locate_session(c);
 811     const char *block = http_argbyname(rq, "block");
 812     const char *report = http_argbyname(rq, "report");
 813     int report_error = 0;
 814     int report_status = 0;
 815     const char *status_message = "OK";
 816     int no_active;
 817
 818     if (report && !strcmp("error", report))
 819         report_error = 1;
 820     if (report && !strcmp("status", report))
 821         report_status = 1;
 822
 823     if (!s)
 824         return;
 825
 826     no_active = session_active_clients(s->psession);
 827     if (block && !strcmp("1", block) && no_active)
 828     {
 829         // if there is already a watch/block. we do not block this one
 830         if (session_set_watch(s->psession, SESSION_WATCH_BYTARGET,
 831                               bytarget_result_ready, c, c) != 0)
 832         {
 833             session_log(s->psession, YLOG_WARN, "Attempt to block "
 834                         "multiple times on bytarget block. Not supported!");
 835             if (report_error)
 836             {
 837                 error(rs, PAZPAR2_ALREADY_BLOCKED, "bytarget");
 838                 release_session(c, s);
 839                 return;
 840             }
 841             else if (report_status)
 842                 status_message = "WARNING (Already blocked on bytarget)";
 843             else {
 844                 session_log(s->psession, YLOG_WARN, "Ignoring bytarget block."
 845                             " Return current result.");
 846             }
 847         }
 848         else
 849         {
 850             session_log(s->psession, c->http_sessions->log_level,
 851                         "Blocking on command bytarget");
 852             release_session(c, s);
 853             return;
 854         }
 855     }
 856     bytarget_response(c, s, status_message);
 857     release_session(c, s);
 858 }
 859
 860 static void write_metadata(WRBUF w, struct conf_service *service,
 861                            struct record_metadata **ml, int full, int indent)
 862 {
 863     int imeta;
 864
 865     for (imeta = 0; imeta < service->num_metadata; imeta++)
 866     {
 867         struct conf_metadata *cmd = &service->metadata[imeta];
 868         struct record_metadata *md;
 869         if (!cmd->brief && !full)
 870             continue;
 871         for (md = ml[imeta]; md; md = md->next)
 872         {
 873             struct record_metadata_attr *attr = md->attributes;
 874             int i;
 875             for (i = 0; i < indent; i++)
 876                 wrbuf_putc(w, ' ');
 877             wrbuf_printf(w, "<md-%s", cmd->name);
 878
 879             for (; attr; attr = attr->next)
 880             {
 881                 wrbuf_printf(w, " %s=\"", attr->name);
 882                 wrbuf_xmlputs(w, attr->value);
 883                 wrbuf_puts(w, "\"");
 884             }
 885             wrbuf_puts(w, ">");
 886             switch (cmd->type)
 887             {
 888                 case Metadata_type_generic:
 889                     wrbuf_xmlputs(w, md->data.text.disp);
 890                     break;
 891                 case Metadata_type_year:
 892                     wrbuf_printf(w, "%d", md->data.number.min);
 893                     if (md->data.number.min != md->data.number.max)
 894                         wrbuf_printf(w, "-%d", md->data.number.max);
 895                     break;
 896                 default:
 897                     wrbuf_puts(w, "[can't represent]");
 898                     break;
 899             }
 900             wrbuf_printf(w, "</md-%s>\n", cmd->name);
 901         }
 902     }
 903 }
 904
 905 static void write_subrecord(struct record *r, WRBUF w,
 906         struct conf_service *service, int show_details)
 907 {
 908     const char *name = session_setting_oneval(
 909         client_get_database(r->client), PZ_NAME);
 910
 911     wrbuf_puts(w, " <location id=\"");
 912     wrbuf_xmlputs(w, client_get_id(r->client));
 913     wrbuf_puts(w, "\"\n");
 914
 915     wrbuf_puts(w, "    name=\"");
 916     wrbuf_xmlputs(w,  *name ? name : "Unknown");
 917     wrbuf_puts(w, "\" ");
 918
 919     wrbuf_puts(w, "checksum=\"");
 920     wrbuf_printf(w,  "%u", r->checksum);
 921     wrbuf_puts(w, "\">\n");
 922
 923     write_metadata(w, service, r->metadata, show_details, 2);
 924     wrbuf_puts(w, " </location>\n");
 925 }
 926
 927 static void show_raw_record_error(void *data, const char *addinfo)
 928 {
 929     http_channel_observer_t obs = data;
 930     struct http_channel *c = http_channel_observer_chan(obs);
 931     struct http_response *rs = c->response;
 932
 933     http_remove_observer(obs);
 934
 935     error(rs, PAZPAR2_RECORD_FAIL, addinfo);
 936 }
 937
 938 static void show_raw_record_ok(void *data, const char *buf, size_t sz)
 939 {
 940     http_channel_observer_t obs = data;
 941     struct http_channel *c = http_channel_observer_chan(obs);
 942     struct http_response *rs = c->response;
 943
 944     http_remove_observer(obs);
 945
 946     wrbuf_write(c->wrbuf, buf, sz);
 947     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 948     http_send_response(c);
 949 }
 950
 951
 952 static void show_raw_record_ok_binary(void *data, const char *buf, size_t sz)
 953 {
 954     http_channel_observer_t obs = data;
 955     struct http_channel *c = http_channel_observer_chan(obs);
 956     struct http_response *rs = c->response;
 957
 958     http_remove_observer(obs);
 959
 960     wrbuf_write(c->wrbuf, buf, sz);
 961     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 962
 963     rs->content_type = "application/octet-stream";
 964     http_send_response(c);
 965 }
 966
 967
 968 void show_raw_reset(void *data, struct http_channel *c, void *data2)
 969 {
 970     //struct client *client = data;
 971     //client_show_raw_remove(client, data2);
 972 }
 973
 974 static void cmd_record_ready(void *data);
 975
 976 static void show_record(struct http_channel *c, struct http_session *s)
 977 {
 978     struct http_response *rs = c->response;
 979     struct http_request *rq = c->request;
 980     struct record_cluster *rec, *prev_r, *next_r;
 981     struct conf_service *service;
 982     const char *idstr = http_argbyname(rq, "id");
 983     const char *offsetstr = http_argbyname(rq, "offset");
 984     const char *binarystr = http_argbyname(rq, "binary");
 985     const char *checksumstr = http_argbyname(rq, "checksum");
 986
 987     if (!s)
 988         return;
 989     service = s->psession->service;
 990     if (!idstr)
 991     {
 992         error(rs, PAZPAR2_MISSING_PARAMETER, "id");
 993         return;
 994     }
 995     wrbuf_rewind(c->wrbuf);
 996     if (!(rec = show_single_start(s->psession, idstr, &prev_r, &next_r)))
 997     {
 998         if (session_active_clients(s->psession) == 0)
 999         {
1000             error(rs, PAZPAR2_RECORD_MISSING, idstr);
1001         }
1002         else if (session_set_watch(s->psession, SESSION_WATCH_RECORD,
1003                               cmd_record_ready, c, c) != 0)
1004         {
1005             error(rs, PAZPAR2_RECORD_MISSING, idstr);
1006         }
1007         return;
1008     }
1009     if (offsetstr || checksumstr)
1010     {
1011         const char *syntax = http_argbyname(rq, "syntax");
1012         const char *esn = http_argbyname(rq, "esn");
1013         int i;
1014         struct record*r = rec->records;
1015         int binary = 0;
1016         const char *nativesyntax = http_argbyname(rq, "nativesyntax");
1017
1018         if (binarystr && *binarystr != '0')
1019             binary = 1;
1020
1021         if (checksumstr)
1022         {
1023             unsigned v = strtoul(checksumstr, 0, 10);
1024             for (i = 0; r; r = r->next)
1025                 if (v == r->checksum)
1026                     break;
1027             if (!r)
1028                 error(rs, PAZPAR2_RECORD_FAIL, "no record");
1029         }
1030         else
1031         {
1032             int offset = atoi(offsetstr);
1033             for (i = 0; i < offset && r; r = r->next, i++)
1034                 ;
1035             if (!r)
1036                 error(rs, PAZPAR2_RECORD_FAIL, "no record at offset given");
1037         }
1038         if (r)
1039         {
1040             http_channel_observer_t obs =
1041                 http_add_observer(c, r->client, show_raw_reset);
1042             int ret = client_show_raw_begin(r->client, r->position,
1043                                             syntax, esn,
1044                                             obs /* data */,
1045                                             show_raw_record_error,
1046                                             (binary ?
1047                                              show_raw_record_ok_binary :
1048                                              show_raw_record_ok),
1049                                             (binary ? 1 : 0),
1050                                             nativesyntax);
1051             if (ret == -1)
1052             {
1053                 http_remove_observer(obs);
1054                 error(rs, PAZPAR2_NO_SESSION, 0);
1055             }
1056         }
1057     }
1058     else
1059     {
1060         struct record *r;
1061         response_open_no_status(c, "record");
1062         wrbuf_puts(c->wrbuf, "\n <recid>");
1063         wrbuf_xmlputs(c->wrbuf, rec->recid);
1064         wrbuf_puts(c->wrbuf, "</recid>\n");
1065         if (prev_r)
1066         {
1067             wrbuf_puts(c->wrbuf, " <prevrecid>");
1068             wrbuf_xmlputs(c->wrbuf, prev_r->recid);
1069             wrbuf_puts(c->wrbuf, "</prevrecid>\n");
1070         }
1071         if (next_r)
1072         {
1073             wrbuf_puts(c->wrbuf, " <nextrecid>");
1074             wrbuf_xmlputs(c->wrbuf, next_r->recid);
1075             wrbuf_puts(c->wrbuf, "</nextrecid>\n");
1076         }
1077         wrbuf_printf(c->wrbuf, " <activeclients>%d</activeclients>\n",
1078                      session_active_clients(s->psession));
1079         write_metadata(c->wrbuf, service, rec->metadata, 1, 1);
1080         for (r = rec->records; r; r = r->next)
1081             write_subrecord(r, c->wrbuf, service, 2);
1082         response_close(c, "record");
1083     }
1084     show_single_stop(s->psession, rec);
1085 }
1086
1087 static void cmd_record_ready(void *data)
1088 {
1089     struct http_channel *c = (struct http_channel *) data;
1090     struct http_session *s = locate_session(c);
1091     if (s)
1092     {
1093         session_log(s->psession, c->http_sessions->log_level,
1094                     "record watch released");
1095         show_record(c, s);
1096         release_session(c,s);
1097     }
1098 }
1099
1100 static void cmd_record(struct http_channel *c)
1101 {
1102     struct http_session *s = locate_session(c);
1103     if (s) {
1104         show_record(c, s);
1105         release_session(c,s);
1106     }
1107 }
1108
1109
1110 static void show_records(struct http_channel *c, struct http_session *s, int active)
1111 {
1112     struct http_request *rq = c->request;
1113     struct http_response *rs = c->response;
1114     struct record_cluster **rl;
1115     struct reclist_sortparms *sp;
1116     const char *start = http_argbyname(rq, "start");
1117     const char *num = http_argbyname(rq, "num");
1118     const char *sort = http_argbyname(rq, "sort");
1119     int version = get_version(rq);
1120
1121     int startn = 0;
1122     int numn = 20;
1123     int total;
1124     Odr_int total_hits;
1125     Odr_int approx_hits;
1126     int i;
1127     struct conf_service *service = 0;
1128     if (!s)
1129         return;
1130
1131     // We haven't counted clients yet if we're called on a block release
1132     if (active < 0)
1133         active = session_active_clients(s->psession);
1134
1135     if (start)
1136         startn = atoi(start);
1137     if (num)
1138         numn = atoi(num);
1139
1140     service = s->psession->service;
1141     if (!sort) {
1142         sort = service->default_sort;
1143     }
1144     if (!(sp = reclist_parse_sortparms(c->nmem, sort, service)))
1145     {
1146         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1147         return;
1148
1149     }
1150
1151     rl = show_range_start(s->psession, sp, startn, &numn, &total,
1152                           &total_hits, &approx_hits, show_records_ready, c);
1153     if (!rl)
1154         return;
1155
1156     response_open(c, "show");
1157     wrbuf_printf(c->wrbuf, "\n<activeclients>%d</activeclients>\n", active);
1158     wrbuf_printf(c->wrbuf, "<merged>%d</merged>\n", total);
1159     wrbuf_printf(c->wrbuf, "<total>" ODR_INT_PRINTF "</total>\n", total_hits);
1160     if (version >= 2) {
1161         wrbuf_printf(c->wrbuf, "<approximation>" ODR_INT_PRINTF "</approximation>\n", approx_hits);
1162     }
1163     wrbuf_printf(c->wrbuf, "<start>%d</start>\n", startn);
1164     wrbuf_printf(c->wrbuf, "<num>%d</num>\n", numn);
1165
1166     for (i = 0; i < numn; i++)
1167     {
1168         int ccount;
1169         struct record *p;
1170         struct record_cluster *rec = rl[i];
1171         struct conf_service *service = s->psession->service;
1172
1173         wrbuf_puts(c->wrbuf, "<hit>\n");
1174         write_metadata(c->wrbuf, service, rec->metadata, 0, 1);
1175         for (ccount = 0, p = rl[i]->records; p;  p = p->next, ccount++)
1176             write_subrecord(p, c->wrbuf, service, 0); // subrecs w/o details
1177         wrbuf_printf(c->wrbuf, " <count>%d</count>\n", ccount);
1178         if (strstr(sort, "relevance"))
1179         {
1180             wrbuf_printf(c->wrbuf, " <relevance>%d</relevance>\n",
1181                          rec->relevance_score);
1182             if (service->rank_debug)
1183             {
1184                 wrbuf_printf(c->wrbuf, " <relevance_info>\n");
1185                 wrbuf_xmlputs(c->wrbuf, wrbuf_cstr(rec->relevance_explain1));
1186                 wrbuf_xmlputs(c->wrbuf, wrbuf_cstr(rec->relevance_explain2));
1187                 wrbuf_printf(c->wrbuf, " </relevance_info>\n");
1188             }
1189         }
1190         wrbuf_puts(c->wrbuf, " <recid>");
1191         wrbuf_xmlputs(c->wrbuf, rec->recid);
1192         wrbuf_puts(c->wrbuf, "</recid>\n");
1193         wrbuf_puts(c->wrbuf, "</hit>\n");
1194     }
1195
1196     show_range_stop(s->psession, rl);
1197
1198     response_close(c, "show");
1199 }
1200
1201 static void show_records_ready(void *data)
1202 {
1203     struct http_channel *c = (struct http_channel *) data;
1204     struct http_session *s = locate_session(c);
1205     if (s)
1206     {
1207         session_log(s->psession, c->http_sessions->log_level,
1208                     "show watch released");
1209         show_records(c, s, -1);
1210     }
1211     else {
1212         /* some error message  */
1213     }
1214     release_session(c,s);
1215 }
1216
1217 static void cmd_show(struct http_channel *c)
1218 {
1219     struct http_request  *rq = c->request;
1220     struct http_response *rs = c->response;
1221     struct http_session *s = locate_session(c);
1222     const char *block = http_argbyname(rq, "block");
1223     const char *sort = http_argbyname(rq, "sort");
1224     const char *block_error = http_argbyname(rq, "report");
1225     const char *mergekey = http_argbyname(rq, "mergekey");
1226     const char *rank = http_argbyname(rq, "rank");
1227     struct conf_service *service = 0;
1228
1229     struct reclist_sortparms *sp;
1230     int status;
1231     int report_error = 0;
1232     if (block_error && !strcmp("1", block_error)) {
1233         report_error = 1;
1234     }
1235     if (!s)
1236         return;
1237
1238     service = s->psession->service;
1239     if (!sort) {
1240         sort = service->default_sort;
1241     }
1242
1243     if (!(sp = reclist_parse_sortparms(c->nmem, sort, service)))
1244     {
1245         error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1246         release_session(c, s);
1247         return;
1248     }
1249     session_sort(s->psession, sp, mergekey, rank);
1250
1251     status = session_active_clients(s->psession);
1252
1253     if (block)
1254     {
1255         if (!strcmp(block, "preferred") && !session_is_preferred_clients_ready(s->psession) && reclist_get_num_records(s->psession->reclist) == 0)
1256         {
1257             // if there is already a watch/block. we do not block this one
1258             if (session_set_watch(s->psession, SESSION_WATCH_SHOW_PREF,
1259                                   show_records_ready, c, c) == 0)
1260             {
1261                 session_log(s->psession, c->http_sessions->log_level,
1262                             "Blocking on command show (preferred targets)");
1263                 release_session(c, s);
1264                 return;
1265             }
1266             else
1267             {
1268                 session_log(s->psession, YLOG_WARN, "Attempt to block"
1269                             " multiple times on show (preferred targets) block."
1270                             " Not supported!");
1271                 if (report_error)
1272                 {
1273                     error(rs, PAZPAR2_ALREADY_BLOCKED,
1274                           "show (preferred targets)");
1275                     release_session(c, s);
1276                     return;
1277                 }
1278                 else
1279                     session_log(s->psession, YLOG_WARN,
1280                                 "Ignoring show(preferred) block."
1281                                 " Returning current result");
1282             }
1283
1284         }
1285         else if (status)
1286         {
1287             // if there is already a watch/block. we do not block this one
1288             if (session_set_watch(s->psession, SESSION_WATCH_SHOW,
1289                                   show_records_ready, c, c) != 0)
1290             {
1291                 session_log(s->psession, YLOG_WARN, "Attempt to block"
1292                             " multiple times on show block. Not supported!");
1293                 if (report_error)
1294                 {
1295                     error(rs, PAZPAR2_ALREADY_BLOCKED, "show");
1296                     release_session(c, s);
1297                     return;
1298                 }
1299                 else
1300                     session_log(s->psession, YLOG_WARN, "Ignoring show block."
1301                                 " Returning current result");
1302             }
1303             else
1304             {
1305                 session_log(s->psession, c->http_sessions->log_level,
1306                             "Blocking on command show");
1307                 release_session(c, s);
1308                 return;
1309             }
1310         }
1311     }
1312     show_records(c, s, status);
1313     release_session(c, s);
1314 }
1315
1316 static void cmd_ping(struct http_channel *c)
1317 {
1318     struct http_session *s = locate_session(c);
1319     if (!s)
1320         return;
1321     response_open(c, "ping");
1322     response_close(c, "ping");
1323     release_session(c, s);
1324 }
1325
1326 static void cmd_search(struct http_channel *c)
1327 {
1328     struct http_request *rq = c->request;
1329     struct http_response *rs = c->response;
1330     struct http_session *s = locate_session(c);
1331     const char *query = http_argbyname(rq, "query");
1332     const char *filter = http_argbyname(rq, "filter");
1333     const char *maxrecs = http_argbyname(rq, "maxrecs");
1334     const char *startrecs = http_argbyname(rq, "startrecs");
1335     const char *limit = http_argbyname(rq, "limit");
1336     const char *sort = http_argbyname(rq, "sort");
1337     const char *mergekey = http_argbyname(rq, "mergekey");
1338     const char *rank = http_argbyname(rq, "rank");
1339     enum pazpar2_error_code code;
1340     const char *addinfo = 0;
1341     struct reclist_sortparms *sp;
1342     struct conf_service *service = 0;
1343
1344     if (!s)
1345         return;
1346
1347     if (!query)
1348     {
1349         error(rs, PAZPAR2_MISSING_PARAMETER, "query");
1350         release_session(c, s);
1351         return;
1352     }
1353     if (!yaz_utf8_check(query))
1354     {
1355         error(rs, PAZPAR2_MALFORMED_PARAMETER_ENCODING, "query");
1356         release_session(c, s);
1357         return;
1358     }
1359     service = s->psession->service;
1360     if (!sort) {
1361         sort = service->default_sort;
1362     }
1363     if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
1364     {
1365         error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1366         release_session(c, s);
1367         return;
1368     }
1369
1370     code = session_search(s->psession, query, startrecs, maxrecs, filter, limit,
1371                           &addinfo, sp, mergekey, rank);
1372     if (code)
1373     {
1374         error(rs, code, addinfo);
1375         release_session(c, s);
1376         return;
1377     }
1378     response_open(c, "search");
1379     response_close(c, "search");
1380     release_session(c, s);
1381 }
1382
1383
1384 static void cmd_stat(struct http_channel *c)
1385 {
1386     struct http_session *s = locate_session(c);
1387     struct statistics stat;
1388     int clients;
1389
1390     float progress = 0;
1391
1392     if (!s)
1393         return;
1394
1395     clients = session_active_clients(s->psession);
1396     statistics(s->psession, &stat);
1397
1398     if (stat.num_clients > 0)
1399     {
1400         progress = (stat.num_clients  - clients) / (float)stat.num_clients;
1401     }
1402
1403     response_open_no_status(c, "stat");
1404     wrbuf_printf(c->wrbuf, "\n <activeclients>%d</activeclients>\n", clients);
1405     wrbuf_printf(c->wrbuf, " <hits>" ODR_INT_PRINTF "</hits>\n", stat.num_hits);
1406     wrbuf_printf(c->wrbuf, " <records>%d</records>\n", stat.num_records);
1407     wrbuf_printf(c->wrbuf, " <clients>%d</clients>\n", stat.num_clients);
1408     wrbuf_printf(c->wrbuf, " <unconnected>%d</unconnected>\n", stat.num_no_connection);
1409     wrbuf_printf(c->wrbuf, " <connecting>%d</connecting>\n", stat.num_connecting);
1410     wrbuf_printf(c->wrbuf, " <working>%d</working>\n", stat.num_working);
1411     wrbuf_printf(c->wrbuf, " <idle>%d</idle>\n", stat.num_idle);
1412     wrbuf_printf(c->wrbuf, " <failed>%d</failed>\n", stat.num_failed);
1413     wrbuf_printf(c->wrbuf, " <error>%d</error>\n", stat.num_error);
1414     wrbuf_printf(c->wrbuf, " <progress>%.2f</progress>\n", progress);
1415     response_close(c, "stat");
1416     release_session(c, s);
1417 }
1418
1419 static void cmd_info(struct http_channel *c)
1420 {
1421     char yaz_version_str[20];
1422     char yaz_sha1_str[42];
1423
1424     response_open_no_status(c, "info");
1425     wrbuf_puts(c->wrbuf, "\n <version>\n");
1426     wrbuf_puts(c->wrbuf, "  <pazpar2");
1427 #ifdef PAZPAR2_VERSION_SHA1
1428     wrbuf_printf(c->wrbuf, " sha1=\"%s\"", PAZPAR2_VERSION_SHA1);
1429 #endif
1430     wrbuf_puts(c->wrbuf, ">");
1431     wrbuf_xmlputs(c->wrbuf, VERSION);
1432     wrbuf_puts(c->wrbuf, "</pazpar2>\n");
1433
1434     yaz_version(yaz_version_str, yaz_sha1_str);
1435     wrbuf_puts(c->wrbuf, "  <yaz compiled=\"");
1436     wrbuf_xmlputs(c->wrbuf, YAZ_VERSION);
1437     wrbuf_puts(c->wrbuf, "\" sha1=\"");
1438     wrbuf_xmlputs(c->wrbuf, yaz_sha1_str);
1439     wrbuf_puts(c->wrbuf, "\">");
1440     wrbuf_xmlputs(c->wrbuf, yaz_version_str);
1441     wrbuf_puts(c->wrbuf, "</yaz>\n");
1442
1443     wrbuf_puts(c->wrbuf, " </version>\n");
1444 #if HAVE_UNISTD_H
1445     {
1446         char hostname_str[64];
1447         if (gethostname(hostname_str, sizeof(hostname_str)) == 0)
1448         {
1449             wrbuf_puts(c->wrbuf, " <host>");
1450             wrbuf_xmlputs(c->wrbuf, hostname_str);
1451             wrbuf_puts(c->wrbuf, "</host>\n");
1452         }
1453     }
1454 #endif
1455     info_services(c->server, c->wrbuf);
1456
1457     response_close(c, "info");
1458 }
1459
1460 struct {
1461     char *name;
1462     void (*fun)(struct http_channel *c);
1463 } commands[] = {
1464     { "init", cmd_init },
1465     { "settings", cmd_settings },
1466     { "stat", cmd_stat },
1467     { "bytarget", cmd_bytarget },
1468     { "show", cmd_show },
1469     { "search", cmd_search },
1470     { "termlist", cmd_termlist },
1471     { "exit", cmd_exit },
1472     { "session-status", cmd_session_status },
1473     { "server-status", cmd_server_status },
1474     { "service", cmd_service },
1475     { "ping", cmd_ping },
1476     { "record", cmd_record },
1477     { "info", cmd_info },
1478     {0,0}
1479 };
1480
1481 void http_command(struct http_channel *c)
1482 {
1483     const char *command = http_argbyname(c->request, "command");
1484     struct http_response *rs = http_create_response(c);
1485     int i;
1486
1487     c->response = rs;
1488
1489     http_addheader(rs, "Expires", "Thu, 19 Nov 1981 08:52:00 GMT");
1490     http_addheader(rs, "Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
1491
1492     if (!command)
1493     {
1494         error(rs, PAZPAR2_MISSING_PARAMETER, "command");
1495         return;
1496     }
1497     for (i = 0; commands[i].name; i++)
1498         if (!strcmp(commands[i].name, command))
1499         {
1500             (*commands[i].fun)(c);
1501             break;
1502         }
1503     if (!commands[i].name)
1504         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "command");
1505
1506     return;
1507 }
1508
1509 /*
1510  * Local variables:
1511  * c-basic-offset: 4
1512  * c-file-style: "Stroustrup"
1513  * indent-tabs-mode: nil
1514  * End:
1515  * vim: shiftwidth=4 tabstop=8 expandtab
1516  */
1517