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, "http_session_timeout");
 180     iochan_setdata(r->timeout_iochan, r);
 181     yaz_log(http_sessions->log_level, "Session %u created. timeout chan=%p timeout=%d", sesid, r->timeout_iochan, service->session_timeout);
 182     iochan_settimeout(r->timeout_iochan, service->session_timeout);
 183
 184     iochan_add(service->server->iochan_man, r->timeout_iochan);
 185     http_session_use(1);
 186     return r;
 187 }
 188
 189 void http_session_destroy(struct http_session *s)
 190 {
 191     int must_destroy = 0;
 192
 193     http_sessions_t http_sessions = s->http_sessions;
 194
 195     yaz_log(http_sessions->log_level, "Session %u destroy", s->session_id);
 196     yaz_mutex_enter(http_sessions->mutex);
 197     /* only if http_session has no active http sessions on it can be destroyed */
 198     if (s->destroy_counter == s->activity_counter)
 199     {
 200         struct http_session **p = 0;
 201         must_destroy = 1;
 202         for (p = &http_sessions->session_list; *p; p = &(*p)->next)
 203             if (*p == s)
 204             {
 205                 *p = (*p)->next;
 206                 break;
 207             }
 208     }
 209     yaz_mutex_leave(http_sessions->mutex);
 210     if (must_destroy)
 211     {   /* destroying for real */
 212         yaz_log(http_sessions->log_level, "Session %u destroyed", s->session_id);
 213         iochan_destroy(s->timeout_iochan);
 214         session_destroy(s->psession);
 215         http_session_use(-1);
 216         nmem_destroy(s->nmem);
 217     }
 218     else {
 219         yaz_log(http_sessions->log_level, "Session %u destroying delayed. Active clients (%d-%d). Waiting for new timeout.",
 220                 s->session_id, s->activity_counter, s->destroy_counter);
 221     }
 222
 223 }
 224
 225 static const char *get_msg(enum pazpar2_error_code code)
 226 {
 227     struct pazpar2_error_msg {
 228         enum pazpar2_error_code code;
 229         const char *msg;
 230     };
 231     static const struct pazpar2_error_msg ar[] = {
 232         { PAZPAR2_NO_SESSION, "Session does not exist or it has expired"},
 233         { PAZPAR2_MISSING_PARAMETER, "Missing parameter"},
 234         { PAZPAR2_MALFORMED_PARAMETER_VALUE, "Malformed parameter value"},
 235         { PAZPAR2_MALFORMED_PARAMETER_ENCODING, "Malformed parameter encoding"},
 236         { PAZPAR2_MALFORMED_SETTING, "Malformed setting argument"},
 237         { PAZPAR2_HITCOUNTS_FAILED, "Failed to retrieve hitcounts"},
 238         { PAZPAR2_RECORD_MISSING, "Record missing"},
 239         { PAZPAR2_NO_TARGETS, "No targets"},
 240         { PAZPAR2_CONFIG_TARGET, "Target cannot be configured"},
 241         { PAZPAR2_RECORD_FAIL, "Record command failed"},
 242         { PAZPAR2_NOT_IMPLEMENTED, "Not implemented"},
 243         { PAZPAR2_NO_SERVICE, "No service"},
 244         { PAZPAR2_ALREADY_BLOCKED, "Already blocked in session on: "},
 245         { PAZPAR2_LAST_ERROR, "Last error"},
 246         { 0, 0 }
 247     };
 248     int i = 0;
 249     while (ar[i].msg)
 250     {
 251         if (code == ar[i].code)
 252             return ar[i].msg;
 253         i++;
 254     }
 255     return "No error";
 256 }
 257
 258 static void error(struct http_response *rs,
 259                   enum pazpar2_error_code code,
 260                   const char *addinfo)
 261 {
 262     struct http_channel *c = rs->channel;
 263     WRBUF text = wrbuf_alloc();
 264     const char *http_status = "417";
 265     const char *msg = get_msg(code);
 266
 267     rs->msg = nmem_strdup(c->nmem, msg);
 268     strcpy(rs->code, http_status);
 269
 270     wrbuf_printf(text, HTTP_COMMAND_RESPONSE_PREFIX "<error code=\"%d\" msg=\"%s\">", (int) code,
 271                msg);
 272     if (addinfo)
 273         wrbuf_xmlputs(text, addinfo);
 274     wrbuf_puts(text, "</error>");
 275
 276     yaz_log(YLOG_WARN, "HTTP %s %s%s%s", http_status,
 277             msg, addinfo ? ": " : "" , addinfo ? addinfo : "");
 278     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(text));
 279     wrbuf_destroy(text);
 280     http_send_response(c);
 281 }
 282
 283 static void response_open_no_status(struct http_channel *c, const char *command)
 284 {
 285     wrbuf_rewind(c->wrbuf);
 286     wrbuf_printf(c->wrbuf, "%s<%s>",
 287                  HTTP_COMMAND_RESPONSE_PREFIX, command);
 288 }
 289
 290 static void response_open(struct http_channel *c, const char *command)
 291 {
 292     response_open_no_status(c, command);
 293     wrbuf_puts(c->wrbuf, "<status>OK</status>");
 294 }
 295
 296 static void response_close(struct http_channel *c, const char *command)
 297 {
 298     struct http_response *rs = c->response;
 299
 300     wrbuf_printf(c->wrbuf, "</%s>", command);
 301     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 302     http_send_response(c);
 303 }
 304
 305 unsigned int make_sessionid(void)
 306 {
 307     static int seq = 0; /* thread pr */
 308     unsigned int res;
 309
 310     seq++;
 311     if (global_parameters.predictable_sessions)
 312         res = seq;
 313     else
 314     {
 315 #ifdef WIN32
 316         res = seq;
 317 #else
 318         struct timeval t;
 319
 320         if (gettimeofday(&t, 0) < 0)
 321         {
 322             yaz_log(YLOG_WARN|YLOG_ERRNO, "gettimeofday");
 323             exit(1);
 324         }
 325         /* at most 256 sessions per second ..
 326            (long long would be more appropriate)*/
 327         res = t.tv_sec;
 328         res = ((res << 8) | (seq & 0xff)) & ((1U << 31) - 1);
 329 #endif
 330     }
 331     return res;
 332 }
 333
 334 static struct http_session *locate_session(struct http_channel *c)
 335 {
 336     struct http_request *rq = c->request;
 337     struct http_response *rs = c->response;
 338     struct http_session *p;
 339     const char *session = http_argbyname(rq, "session");
 340     http_sessions_t http_sessions = c->http_sessions;
 341     unsigned int id;
 342
 343     if (!session)
 344     {
 345         error(rs, PAZPAR2_MISSING_PARAMETER, "session");
 346         return 0;
 347     }
 348     id = atoi(session);
 349     yaz_mutex_enter(http_sessions->mutex);
 350     for (p = http_sessions->session_list; p; p = p->next)
 351         if (id == p->session_id)
 352             break;
 353     if (p)
 354         p->activity_counter++;
 355     yaz_mutex_leave(http_sessions->mutex);
 356     if (p)
 357         iochan_activity(p->timeout_iochan);
 358     else
 359         error(rs, PAZPAR2_NO_SESSION, session);
 360     return p;
 361 }
 362
 363 // Call after use of locate_session, in order to increment the destroy_counter
 364 static void release_session(struct http_channel *c,
 365                             struct http_session *session)
 366 {
 367     http_sessions_t http_sessions = c->http_sessions;
 368     yaz_mutex_enter(http_sessions->mutex);
 369     if (session)
 370         session->destroy_counter++;
 371     yaz_mutex_leave(http_sessions->mutex);
 372 }
 373
 374 // Decode settings parameters and apply to session
 375 // Syntax: setting[target]=value
 376 static int process_settings(struct session *se, struct http_request *rq,
 377                             struct http_response *rs)
 378 {
 379     struct http_argument *a;
 380
 381     for (a = rq->arguments; a; a = a->next)
 382         if (strchr(a->name, '['))
 383         {
 384             char **res;
 385             int num;
 386             char *dbname;
 387             char *setting;
 388
 389             // Nmem_strsplit *rules*!!!
 390             nmem_strsplit(se->session_nmem, "[]", a->name, &res, &num);
 391             if (num != 2)
 392             {
 393                 error(rs, PAZPAR2_MALFORMED_SETTING, a->name);
 394                 return -1;
 395             }
 396             setting = res[0];
 397             dbname = res[1];
 398             session_apply_setting(se, dbname, setting,
 399                     nmem_strdup(se->session_nmem, a->value));
 400         }
 401     return 0;
 402 }
 403
 404 static void cmd_exit(struct http_channel *c)
 405 {
 406     yaz_log(YLOG_WARN, "exit");
 407
 408     response_open(c, "exit");
 409     response_close(c, "exit");
 410     if (global_parameters.debug_mode)
 411         http_close_server(c->server);
 412 }
 413
 414 static void cmd_init(struct http_channel *c)
 415 {
 416     struct http_request *r = c->request;
 417     const char *clear = http_argbyname(r, "clear");
 418     const char *content_type = http_lookup_header(r->headers, "Content-Type");
 419     unsigned int sesid;
 420     struct http_session *s;
 421     struct http_response *rs = c->response;
 422     struct conf_service *service = 0; /* no service (yet) */
 423
 424     if (r->content_len && content_type &&
 425         !yaz_strcmp_del("text/xml", content_type, "; "))
 426     {
 427         xmlDoc *doc = xmlParseMemory(r->content_buf, r->content_len);
 428         xmlNode *root_n;
 429         if (!doc)
 430         {
 431             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 432             return;
 433         }
 434         root_n = xmlDocGetRootElement(doc);
 435         service = service_create(c->server, root_n);
 436         xmlFreeDoc(doc);
 437         if (!service)
 438         {
 439             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 440             return;
 441         }
 442     }
 443
 444     if (!service)
 445     {
 446         const char *service_name = http_argbyname(c->request, "service");
 447         service = locate_service(c->server, service_name);
 448         if (!service)
 449         {
 450             error(rs, PAZPAR2_NO_SERVICE, service_name ? service_name : "unnamed");
 451             return;
 452         }
 453     }
 454     sesid = make_sessionid();
 455     s = http_session_create(service, c->http_sessions, sesid);
 456
 457     yaz_log(c->http_sessions->log_level, "Session init %u ", sesid);
 458     if (!clear || *clear == '0')
 459         session_init_databases(s->psession);
 460     else
 461         yaz_log(YLOG_LOG, "Session %u init: No databases preloaded", sesid);
 462
 463     if (process_settings(s->psession, c->request, c->response) < 0)
 464         return;
 465
 466     response_open(c, "init");
 467     wrbuf_printf(c->wrbuf, "<session>%d", sesid);
 468     if (c->server->server_id)
 469     {
 470         wrbuf_puts(c->wrbuf, ".");
 471         wrbuf_puts(c->wrbuf, c->server->server_id);
 472     }
 473     wrbuf_puts(c->wrbuf, "</session>"
 474                "<protocol>" PAZPAR2_PROTOCOL_VERSION "</protocol>");
 475
 476     wrbuf_printf(c->wrbuf, "<keepAlive>%d</keepAlive>\n", 1000 * ((s->psession->service->session_timeout >= 20) ?
 477                                                                   (s->psession->service->session_timeout - 10) : 50));
 478     response_close(c, "init");
 479 }
 480
 481 static void apply_local_setting(void *client_data,
 482                                 struct setting *set)
 483 {
 484     struct session *se =  (struct session *) client_data;
 485
 486     session_apply_setting(se, nmem_strdup(se->session_nmem, set->target),
 487                           nmem_strdup(se->session_nmem, set->name),
 488                           nmem_strdup(se->session_nmem, set->value));
 489 }
 490
 491 static void cmd_settings(struct http_channel *c)
 492 {
 493     struct http_response *rs = c->response;
 494     struct http_request *rq = c->request;
 495     struct http_session *s = locate_session(c);
 496     const char *content_type = http_lookup_header(rq->headers, "Content-Type");
 497
 498     if (!s)
 499         return;
 500
 501     if (rq->content_len && content_type &&
 502         !yaz_strcmp_del("text/xml", content_type, "; "))
 503     {
 504         xmlDoc *doc = xmlParseMemory(rq->content_buf, rq->content_len);
 505         xmlNode *root_n;
 506         int ret;
 507         if (!doc)
 508         {
 509             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 510             release_session(c,s);
 511             return;
 512         }
 513         root_n = xmlDocGetRootElement(doc);
 514         ret = settings_read_node_x(root_n, s->psession, apply_local_setting);
 515         xmlFreeDoc(doc);
 516         if (ret)
 517         {
 518             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 519             release_session(c,s);
 520             return;
 521         }
 522     }
 523     if (process_settings(s->psession, rq, rs) < 0)
 524     {
 525         release_session(c, s);
 526         return;
 527     }
 528     response_open(c, "settings");
 529     response_close(c, "settings");
 530     release_session(c, s);
 531 }
 532
 533 static void termlist_response(struct http_channel *c, struct http_session *s, const char *cmd_status)
 534 {
 535     struct http_request *rq = c->request;
 536     const char *name    = http_argbyname(rq, "name");
 537     const char *nums    = http_argbyname(rq, "num");
 538     int version = get_version(rq);
 539     int num = 15;
 540     int status;
 541
 542     if (nums)
 543         num = atoi(nums);
 544
 545     status = session_active_clients(s->psession);
 546
 547     response_open_no_status(c, "termlist");
 548     /* new protocol add a status to response. Triggered by a status parameter */
 549     if (cmd_status != 0) {
 550         wrbuf_printf(c->wrbuf, "<status>%s</status>\n", cmd_status);
 551     }
 552     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", status);
 553
 554     perform_termlist(c, s->psession, name, num, version);
 555
 556     response_close(c, "termlist");
 557 }
 558
 559 static void termlist_result_ready(void *data)
 560 {
 561     struct http_channel *c = (struct http_channel *) data;
 562     struct http_request *rq = c->request;
 563     const char *report = http_argbyname(rq, "report");
 564     const char *status = 0;
 565     struct http_session *s = locate_session(c);
 566     if (report && !strcmp("status", report))
 567         status = "OK";
 568     if (s) {
 569         yaz_log(c->http_sessions->log_level, "Session %u termlist watch released", s->session_id);
 570         termlist_response(c, s, status);
 571         release_session(c,s);
 572     }
 573 }
 574
 575 static void cmd_termlist(struct http_channel *c)
 576 {
 577     struct http_request *rq = c->request;
 578     struct http_response *rs = c->response;
 579     struct http_session *s = locate_session(c);
 580     const char *block = http_argbyname(rq, "block");
 581     const char *report = http_argbyname(rq, "report");
 582     int report_status = 0;
 583     int report_error = 0;
 584     const char *status_message = 0;
 585     int active_clients;
 586     if (report  && !strcmp("error", report)) {
 587         report_error = 1;
 588         status_message = "OK";
 589     }
 590     if (report  && !strcmp("status", report)) {
 591         report_status = 1;
 592         status_message = "OK";
 593     }
 594     if (!s)
 595         return;
 596
 597     active_clients = session_active_clients(s->psession);
 598     if (block && !strcmp("1", block) && active_clients)
 599     {
 600         // if there is already a watch/block. we do not block this one
 601         if (session_set_watch(s->psession, SESSION_WATCH_TERMLIST,
 602                               termlist_result_ready, c, c) != 0)
 603         {
 604             yaz_log(YLOG_WARN, "Session %u: Attempt to block multiple times on termlist block. Not supported!", s->session_id);
 605             if (report_error) {
 606                 error(rs, PAZPAR2_ALREADY_BLOCKED, "termlist");
 607                 release_session(c, s);
 608                 return;
 609             }
 610             else if (report_status) {
 611                 status_message = "WARNING (Already blocked on termlist)";
 612             }
 613             else {
 614                 yaz_log(YLOG_WARN, "Session %u: Ignoring termlist block. Return current result", s->session_id);
 615             }
 616         }
 617         else
 618         {
 619             yaz_log(c->http_sessions->log_level, "Session %u: Blocking on command termlist", s->session_id);
 620             release_session(c, s);
 621             return;
 622         }
 623     }
 624
 625     termlist_response(c, s, status_message);
 626     release_session(c, s);
 627 }
 628
 629 size_t session_get_memory_status(struct session *session);
 630
 631 static void session_status(struct http_channel *c, struct http_session *s)
 632 {
 633     size_t session_nmem;
 634     wrbuf_printf(c->wrbuf, "<http_count>%u</http_count>\n", s->activity_counter);
 635     wrbuf_printf(c->wrbuf, "<http_nmem>%zu</http_nmem>\n", nmem_total(s->nmem) );
 636     session_nmem = session_get_memory_status(s->psession);
 637     wrbuf_printf(c->wrbuf, "<session_nmem>%zu</session_nmem>\n", session_nmem);
 638 }
 639
 640 static void cmd_session_status(struct http_channel *c)
 641 {
 642     struct http_session *s = locate_session(c);
 643     if (!s)
 644         return;
 645
 646     response_open(c, "session-status");
 647     session_status(c, s);
 648     response_close(c, "session-status");
 649     release_session(c, s);
 650 }
 651
 652 int sessions_count(void);
 653 int clients_count(void);
 654 #ifdef HAVE_RESULTSETS_COUNT
 655 int resultsets_count(void);
 656 #else
 657 #define resultsets_count()      0
 658 #endif
 659
 660 static void cmd_server_status(struct http_channel *c)
 661 {
 662     int sessions   = sessions_count();
 663     int clients    = clients_count();
 664     int resultsets = resultsets_count();
 665
 666     response_open(c, "server-status");
 667     wrbuf_printf(c->wrbuf, "\n  <sessions>%u</sessions>\n", sessions);
 668     wrbuf_printf(c->wrbuf, "  <clients>%u</clients>\n",   clients);
 669     /* Only works if yaz has been compiled with enabling of this */
 670     wrbuf_printf(c->wrbuf, "  <resultsets>%u</resultsets>\n",resultsets);
 671     print_meminfo(c->wrbuf);
 672
 673 /* TODO add all sessions status                         */
 674 /*    http_sessions_t http_sessions = c->http_sessions; */
 675 /*    struct http_session *p;                           */
 676 /*
 677     yaz_mutex_enter(http_sessions->mutex);
 678     for (p = http_sessions->session_list; p; p = p->next)
 679     {
 680         p->activity_counter++;
 681         wrbuf_puts(c->wrbuf, "<session-status>\n");
 682         wrbuf_printf(c->wrbuf, "<id>%s</id>\n", p->session_id);
 683         yaz_mutex_leave(http_sessions->mutex);
 684         session_status(c, p);
 685         wrbuf_puts(c->wrbuf, "</session-status>\n");
 686         yaz_mutex_enter(http_sessions->mutex);
 687         p->activity_counter--;
 688     }
 689     yaz_mutex_leave(http_sessions->mutex);
 690 */
 691     response_close(c, "server-status");
 692     xmalloc_trav(0);
 693 }
 694
 695 static void bytarget_response(struct http_channel *c, struct http_session *s, const char *cmd_status) {
 696     int count, i;
 697     struct hitsbytarget *ht;
 698     struct http_request *rq = c->request;
 699     const char *settings = http_argbyname(rq, "settings");
 700     int version = get_version(rq);
 701     ht = get_hitsbytarget(s->psession, &count, c->nmem);
 702     if (!cmd_status)
 703         /* Old protocol, always ok */
 704         response_open(c, "bytarget");
 705     else {
 706         /* New protocol, OK or WARNING (...)*/
 707         response_open_no_status(c, "bytarget");
 708         wrbuf_printf(c->wrbuf, "<status>%s</status>", cmd_status);
 709     }
 710
 711     if (count == 0)
 712         yaz_log(YLOG_WARN, "Empty bytarget Response. No targets found!");
 713     for (i = 0; i < count; i++)
 714     {
 715         wrbuf_puts(c->wrbuf, "\n<target>");
 716
 717         wrbuf_puts(c->wrbuf, "<id>");
 718         wrbuf_xmlputs(c->wrbuf, ht[i].id);
 719         wrbuf_puts(c->wrbuf, "</id>\n");
 720
 721         if (ht[i].name && ht[i].name[0])
 722         {
 723             wrbuf_puts(c->wrbuf, "<name>");
 724             wrbuf_xmlputs(c->wrbuf, ht[i].name);
 725             wrbuf_puts(c->wrbuf, "</name>\n");
 726         }
 727
 728         wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", ht[i].hits);
 729         wrbuf_printf(c->wrbuf, "<diagnostic>%d</diagnostic>\n", ht[i].diagnostic);
 730         if (ht[i].diagnostic)
 731         {
 732             wrbuf_puts(c->wrbuf, "<message>");
 733             wrbuf_xmlputs(c->wrbuf, ht[i].message);
 734             wrbuf_puts(c->wrbuf, "</message>\n");
 735             wrbuf_puts(c->wrbuf, "<addinfo>");
 736             if (ht[i].addinfo)
 737                 wrbuf_xmlputs(c->wrbuf, ht[i].addinfo);
 738             wrbuf_puts(c->wrbuf, "</addinfo>\n");
 739         }
 740
 741         wrbuf_printf(c->wrbuf, "<records>%d</records>\n", ht[i].records - ht[i].filtered);
 742         if (version >= 2) {
 743             wrbuf_printf(c->wrbuf, "<filtered>%d</filtered>\n", ht[i].filtered);
 744             wrbuf_printf(c->wrbuf, "<approximation>" ODR_INT_PRINTF "</approximation>\n", ht[i].approximation);
 745         }
 746         wrbuf_puts(c->wrbuf, "<state>");
 747         wrbuf_xmlputs(c->wrbuf, ht[i].state);
 748         wrbuf_puts(c->wrbuf, "</state>\n");
 749         if (settings && *settings == '1')
 750         {
 751             wrbuf_puts(c->wrbuf, "<settings>\n");
 752             wrbuf_puts(c->wrbuf, ht[i].settings_xml);
 753             wrbuf_puts(c->wrbuf, "</settings>\n");
 754         }
 755         if (ht[i].suggestions_xml && ht[i].suggestions_xml[0]) {
 756             wrbuf_puts(c->wrbuf, "<suggestions>");
 757             wrbuf_puts(c->wrbuf, ht[i].suggestions_xml);
 758             wrbuf_puts(c->wrbuf, "</suggestions>");
 759         }
 760         wrbuf_puts(c->wrbuf, "</target>");
 761     }
 762     response_close(c, "bytarget");
 763 }
 764
 765 static void bytarget_result_ready(void *data)
 766 {
 767     struct http_channel *c = (struct http_channel *) data;
 768     struct http_session *s = locate_session(c);
 769     const char *status_message = "OK";
 770     if (s) {
 771         yaz_log(c->http_sessions->log_level, "Session %u: bytarget watch released", s->session_id);
 772         bytarget_response(c, s, status_message);
 773         release_session(c, s);
 774     }
 775     else {
 776         yaz_log(c->http_sessions->log_level, "No Session found for released bytarget watch");
 777     }
 778 }
 779
 780
 781 static void cmd_bytarget(struct http_channel *c)
 782 {
 783     struct http_request *rq = c->request;
 784     struct http_response *rs = c->response;
 785     struct http_session *s = locate_session(c);
 786     const char *block = http_argbyname(rq, "block");
 787     const char *report = http_argbyname(rq, "report");
 788     int report_error = 0;
 789     int report_status = 0;
 790     const char *status_message = "OK";
 791     int no_active;
 792
 793     if (report && !strcmp("error", report)) {
 794         report_error = 1;
 795     }
 796     if (report && !strcmp("status", report)) {
 797         report_status = 1;
 798     }
 799
 800     if (!s)
 801         return;
 802
 803     no_active = session_active_clients(s->psession);
 804     if (block && !strcmp("1",block) && no_active)
 805     {
 806         // if there is already a watch/block. we do not block this one
 807         if (session_set_watch(s->psession, SESSION_WATCH_BYTARGET,
 808                               bytarget_result_ready, c, c) != 0)
 809         {
 810             yaz_log(YLOG_WARN, "Session %u: Attempt to block multiple times on bytarget block. Not supported!", s->session_id);
 811             if (report_error) {
 812                 error(rs, PAZPAR2_ALREADY_BLOCKED, "bytarget");
 813                 release_session(c, s);
 814                 return;
 815             }
 816             else if (report_status) {
 817                 status_message = "WARNING (Already blocked on bytarget)";
 818             }
 819             else {
 820                 yaz_log(YLOG_WARN, "Session %u: Ignoring bytarget block. Return current result.", s->session_id);
 821             }
 822         }
 823         else
 824         {
 825             yaz_log(c->http_sessions->log_level, "Session %u: Blocking on command bytarget", s->session_id);
 826             release_session(c, s);
 827             return;
 828         }
 829     }
 830     bytarget_response(c, s, status_message);
 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
1123     rl = show_range_start(s->psession, sp, startn, &numn, &total,
1124                           &total_hits, &approx_hits, show_records_ready, c);
1125     if (!rl)
1126         return;
1127
1128     response_open(c, "show");
1129     wrbuf_printf(c->wrbuf, "\n<activeclients>%d</activeclients>\n", active);
1130     wrbuf_printf(c->wrbuf, "<merged>%d</merged>\n", total);
1131     wrbuf_printf(c->wrbuf, "<total>" ODR_INT_PRINTF "</total>\n", total_hits);
1132     if (version >= 2) {
1133         wrbuf_printf(c->wrbuf, "<approximation>" ODR_INT_PRINTF "</approximation>\n", approx_hits);
1134     }
1135     wrbuf_printf(c->wrbuf, "<start>%d</start>\n", startn);
1136     wrbuf_printf(c->wrbuf, "<num>%d</num>\n", numn);
1137
1138     for (i = 0; i < numn; i++)
1139     {
1140         int ccount;
1141         struct record *p;
1142         struct record_cluster *rec = rl[i];
1143         struct conf_service *service = s->psession->service;
1144
1145         wrbuf_puts(c->wrbuf, "<hit>\n");
1146         write_metadata(c->wrbuf, service, rec->metadata, 0, 1);
1147         for (ccount = 0, p = rl[i]->records; p;  p = p->next, ccount++)
1148             write_subrecord(p, c->wrbuf, service, 0); // subrecs w/o details
1149         wrbuf_printf(c->wrbuf, " <count>%d</count>\n", ccount);
1150         if (strstr(sort, "relevance"))
1151         {
1152             wrbuf_printf(c->wrbuf, " <relevance>%d</relevance>\n",
1153                          rec->relevance_score);
1154             if (service->rank_debug)
1155             {
1156                 wrbuf_printf(c->wrbuf, " <relevance_info>\n");
1157                 wrbuf_xmlputs(c->wrbuf, wrbuf_cstr(rec->relevance_explain1));
1158                 wrbuf_xmlputs(c->wrbuf, wrbuf_cstr(rec->relevance_explain2));
1159                 wrbuf_printf(c->wrbuf, " </relevance_info>\n");
1160             }
1161         }
1162         wrbuf_puts(c->wrbuf, " <recid>");
1163         wrbuf_xmlputs(c->wrbuf, rec->recid);
1164         wrbuf_puts(c->wrbuf, "</recid>\n");
1165         wrbuf_puts(c->wrbuf, "</hit>\n");
1166     }
1167
1168     show_range_stop(s->psession, rl);
1169
1170     response_close(c, "show");
1171 }
1172
1173 static void show_records_ready(void *data)
1174 {
1175     struct http_channel *c = (struct http_channel *) data;
1176     struct http_session *s = locate_session(c);
1177     if (s) {
1178         yaz_log(c->http_sessions->log_level, "Session %u: show watch released", s->session_id);
1179         show_records(c, s, -1);
1180     }
1181     else {
1182         /* some error message  */
1183     }
1184     release_session(c,s);
1185 }
1186
1187 static void cmd_show(struct http_channel *c)
1188 {
1189     struct http_request  *rq = c->request;
1190     struct http_response *rs = c->response;
1191     struct http_session *s = locate_session(c);
1192     const char *block = http_argbyname(rq, "block");
1193     const char *sort = http_argbyname(rq, "sort");
1194     const char *block_error = http_argbyname(rq, "report");
1195     struct conf_service *service = 0;
1196
1197     struct reclist_sortparms *sp;
1198     int status;
1199     int report_error = 0;
1200     if (block_error && !strcmp("1", block_error)) {
1201         report_error = 1;
1202     }
1203     if (!s)
1204         return;
1205
1206     service = s->psession->service;
1207     if (!sort) {
1208         sort = service->default_sort;
1209     }
1210
1211     if (!(sp = reclist_parse_sortparms(c->nmem, sort, service)))
1212     {
1213         error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1214         release_session(c, s);
1215         return;
1216     }
1217     session_sort(s->psession, sp);
1218
1219     status = session_active_clients(s->psession);
1220
1221     if (block)
1222     {
1223         if (!strcmp(block, "preferred") && !session_is_preferred_clients_ready(s->psession) && reclist_get_num_records(s->psession->reclist) == 0)
1224         {
1225             // if there is already a watch/block. we do not block this one
1226             if (session_set_watch(s->psession, SESSION_WATCH_SHOW_PREF,
1227                                   show_records_ready, c, c) == 0)
1228             {
1229                 yaz_log(c->http_sessions->log_level,
1230                         "Session %u: Blocking on command show (preferred targets)", s->session_id);
1231                 release_session(c, s);
1232                 return;
1233             }
1234             else
1235             {
1236                 yaz_log(YLOG_WARN, "Session %u: Attempt to block multiple times on show (preferred targets) block. Not supported!",
1237                     s->session_id);
1238                 if (report_error) {
1239                     error(rs, PAZPAR2_ALREADY_BLOCKED, "show (preferred targets)");
1240                     release_session(c, s);
1241                     return;
1242                 }
1243                 else {
1244                     yaz_log(YLOG_WARN, "Session %u: Ignoring show(preferred) block. Returning current result.", s->session_id);
1245                 }
1246             }
1247
1248         }
1249         else if (status)
1250         {
1251             // if there is already a watch/block. we do not block this one
1252             if (session_set_watch(s->psession, SESSION_WATCH_SHOW,
1253                                   show_records_ready, c, c) != 0)
1254             {
1255                 yaz_log(YLOG_WARN, "Session %u: Attempt to block multiple times on show block. Not supported!", s->session_id);
1256                 if (report_error) {
1257                     error(rs, PAZPAR2_ALREADY_BLOCKED, "show");
1258                     release_session(c, s);
1259                     return;
1260                 }
1261                 else {
1262                     yaz_log(YLOG_WARN, "Session %u: Ignoring show block. Returning current result.", s->session_id);
1263                 }
1264             }
1265             else
1266             {
1267                 yaz_log(c->http_sessions->log_level, "Session %u: Blocking on command show", s->session_id);
1268                 release_session(c, s);
1269                 return;
1270             }
1271         }
1272     }
1273     show_records(c, s, status);
1274     release_session(c, s);
1275 }
1276
1277 static void cmd_ping(struct http_channel *c)
1278 {
1279     struct http_session *s = locate_session(c);
1280     if (!s)
1281         return;
1282     response_open(c, "ping");
1283     response_close(c, "ping");
1284     release_session(c, s);
1285 }
1286
1287 static void cmd_search(struct http_channel *c)
1288 {
1289     struct http_request *rq = c->request;
1290     struct http_response *rs = c->response;
1291     struct http_session *s = locate_session(c);
1292     const char *query = http_argbyname(rq, "query");
1293     const char *filter = http_argbyname(rq, "filter");
1294     const char *maxrecs = http_argbyname(rq, "maxrecs");
1295     const char *startrecs = http_argbyname(rq, "startrecs");
1296     const char *limit = http_argbyname(rq, "limit");
1297     const char *sort = http_argbyname(rq, "sort");
1298     enum pazpar2_error_code code;
1299     const char *addinfo = 0;
1300     struct reclist_sortparms *sp;
1301     struct conf_service *service = 0;
1302
1303     if (!s)
1304         return;
1305
1306     if (!query)
1307     {
1308         error(rs, PAZPAR2_MISSING_PARAMETER, "query");
1309         release_session(c, s);
1310         return;
1311     }
1312     if (!yaz_utf8_check(query))
1313     {
1314         error(rs, PAZPAR2_MALFORMED_PARAMETER_ENCODING, "query");
1315         release_session(c, s);
1316         return;
1317     }
1318     service = s->psession->service;
1319     if (!sort) {
1320         sort = service->default_sort;
1321     }
1322     if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
1323     {
1324         error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1325         release_session(c, s);
1326         return;
1327     }
1328
1329     code = session_search(s->psession, query, startrecs, maxrecs, filter, limit,
1330                           &addinfo, sp);
1331     if (code)
1332     {
1333         error(rs, code, addinfo);
1334         release_session(c, s);
1335         return;
1336     }
1337     response_open(c, "search");
1338     response_close(c, "search");
1339     release_session(c, s);
1340 }
1341
1342
1343 static void cmd_stat(struct http_channel *c)
1344 {
1345     struct http_session *s = locate_session(c);
1346     struct statistics stat;
1347     int clients;
1348
1349     float progress = 0;
1350
1351     if (!s)
1352         return;
1353
1354     clients = session_active_clients(s->psession);
1355     statistics(s->psession, &stat);
1356
1357     if (stat.num_clients > 0)
1358     {
1359         progress = (stat.num_clients  - clients) / (float)stat.num_clients;
1360     }
1361
1362     response_open_no_status(c, "stat");
1363     wrbuf_printf(c->wrbuf, "\n <activeclients>%d</activeclients>\n", clients);
1364     wrbuf_printf(c->wrbuf, " <hits>" ODR_INT_PRINTF "</hits>\n", stat.num_hits);
1365     wrbuf_printf(c->wrbuf, " <records>%d</records>\n", stat.num_records);
1366     wrbuf_printf(c->wrbuf, " <clients>%d</clients>\n", stat.num_clients);
1367     wrbuf_printf(c->wrbuf, " <unconnected>%d</unconnected>\n", stat.num_no_connection);
1368     wrbuf_printf(c->wrbuf, " <connecting>%d</connecting>\n", stat.num_connecting);
1369     wrbuf_printf(c->wrbuf, " <working>%d</working>\n", stat.num_working);
1370     wrbuf_printf(c->wrbuf, " <idle>%d</idle>\n", stat.num_idle);
1371     wrbuf_printf(c->wrbuf, " <failed>%d</failed>\n", stat.num_failed);
1372     wrbuf_printf(c->wrbuf, " <error>%d</error>\n", stat.num_error);
1373     wrbuf_printf(c->wrbuf, " <progress>%.2f</progress>\n", progress);
1374     response_close(c, "stat");
1375     release_session(c, s);
1376 }
1377
1378 static void cmd_info(struct http_channel *c)
1379 {
1380     char yaz_version_str[20];
1381     char yaz_sha1_str[42];
1382
1383     response_open_no_status(c, "info");
1384     wrbuf_puts(c->wrbuf, "\n <version>\n");
1385     wrbuf_puts(c->wrbuf, "  <pazpar2");
1386 #ifdef PAZPAR2_VERSION_SHA1
1387     wrbuf_printf(c->wrbuf, " sha1=\"%s\"", PAZPAR2_VERSION_SHA1);
1388 #endif
1389     wrbuf_puts(c->wrbuf, ">");
1390     wrbuf_xmlputs(c->wrbuf, VERSION);
1391     wrbuf_puts(c->wrbuf, "</pazpar2>\n");
1392
1393     yaz_version(yaz_version_str, yaz_sha1_str);
1394     wrbuf_puts(c->wrbuf, "  <yaz compiled=\"");
1395     wrbuf_xmlputs(c->wrbuf, YAZ_VERSION);
1396     wrbuf_puts(c->wrbuf, "\" sha1=\"");
1397     wrbuf_xmlputs(c->wrbuf, yaz_sha1_str);
1398     wrbuf_puts(c->wrbuf, "\">");
1399     wrbuf_xmlputs(c->wrbuf, yaz_version_str);
1400     wrbuf_puts(c->wrbuf, "</yaz>\n");
1401
1402     wrbuf_puts(c->wrbuf, " </version>\n");
1403 #if HAVE_UNISTD_H
1404     {
1405         char hostname_str[64];
1406         if (gethostname(hostname_str, sizeof(hostname_str)) == 0)
1407         {
1408             wrbuf_puts(c->wrbuf, " <host>");
1409             wrbuf_xmlputs(c->wrbuf, hostname_str);
1410             wrbuf_puts(c->wrbuf, "</host>\n");
1411         }
1412     }
1413 #endif
1414     info_services(c->server, c->wrbuf);
1415
1416     response_close(c, "info");
1417 }
1418
1419 struct {
1420     char *name;
1421     void (*fun)(struct http_channel *c);
1422 } commands[] = {
1423     { "init", cmd_init },
1424     { "settings", cmd_settings },
1425     { "stat", cmd_stat },
1426     { "bytarget", cmd_bytarget },
1427     { "show", cmd_show },
1428     { "search", cmd_search },
1429     { "termlist", cmd_termlist },
1430     { "exit", cmd_exit },
1431     { "session-status", cmd_session_status },
1432     { "server-status", cmd_server_status },
1433     { "ping", cmd_ping },
1434     { "record", cmd_record },
1435     { "info", cmd_info },
1436     {0,0}
1437 };
1438
1439 void http_command(struct http_channel *c)
1440 {
1441     const char *command = http_argbyname(c->request, "command");
1442     struct http_response *rs = http_create_response(c);
1443     int i;
1444
1445     c->response = rs;
1446
1447     http_addheader(rs, "Expires", "Thu, 19 Nov 1981 08:52:00 GMT");
1448     http_addheader(rs, "Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
1449
1450     if (!command)
1451     {
1452         error(rs, PAZPAR2_MISSING_PARAMETER, "command");
1453         return;
1454     }
1455     for (i = 0; commands[i].name; i++)
1456         if (!strcmp(commands[i].name, command))
1457         {
1458             (*commands[i].fun)(c);
1459             break;
1460         }
1461     if (!commands[i].name)
1462         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "command");
1463
1464     return;
1465 }
1466
1467 /*
1468  * Local variables:
1469  * c-basic-offset: 4
1470  * c-file-style: "Stroustrup"
1471  * indent-tabs-mode: nil
1472  * End:
1473  * vim: shiftwidth=4 tabstop=8 expandtab
1474  */
1475