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     xmlNode *xml_node;
 655     if (!s)
 656         return;
 657
 658     response_open(c, "service");
 659     xml_node = s->psession->service->xml_node;
 660     if (xml_node)
 661     {
 662         xmlNode *tmp = xmlCopyNode(xml_node, 1);
 663         xmlBufferPtr buf = xmlBufferCreate();
 664
 665         xmlNodeDump(buf, tmp->doc, tmp, 0, 0);
 666
 667         wrbuf_write(c->wrbuf, (const char *) buf->content, buf->use);
 668         xmlBufferFree(buf);
 669     }
 670
 671     response_close(c, "service");
 672     release_session(c, s);
 673 }
 674
 675 static void cmd_session_status(struct http_channel *c)
 676 {
 677     struct http_session *s = locate_session(c);
 678     if (!s)
 679         return;
 680
 681     response_open(c, "session-status");
 682     session_status(c, s);
 683     response_close(c, "session-status");
 684     release_session(c, s);
 685 }
 686
 687 int sessions_count(void);
 688 int clients_count(void);
 689 #ifdef HAVE_RESULTSETS_COUNT
 690 int resultsets_count(void);
 691 #else
 692 #define resultsets_count()      0
 693 #endif
 694
 695 static void cmd_server_status(struct http_channel *c)
 696 {
 697     int sessions   = sessions_count();
 698     int clients    = clients_count();
 699     int resultsets = resultsets_count();
 700
 701     response_open(c, "server-status");
 702     wrbuf_printf(c->wrbuf, "\n  <sessions>%u</sessions>\n", sessions);
 703     wrbuf_printf(c->wrbuf, "  <clients>%u</clients>\n",   clients);
 704     /* Only works if yaz has been compiled with enabling of this */
 705     wrbuf_printf(c->wrbuf, "  <resultsets>%u</resultsets>\n",resultsets);
 706     print_meminfo(c->wrbuf);
 707
 708 /* TODO add all sessions status                         */
 709 /*    http_sessions_t http_sessions = c->http_sessions; */
 710 /*    struct http_session *p;                           */
 711 /*
 712     yaz_mutex_enter(http_sessions->mutex);
 713     for (p = http_sessions->session_list; p; p = p->next)
 714     {
 715         p->activity_counter++;
 716         wrbuf_puts(c->wrbuf, "<session-status>\n");
 717         wrbuf_printf(c->wrbuf, "<id>%s</id>\n", p->session_id);
 718         yaz_mutex_leave(http_sessions->mutex);
 719         session_status(c, p);
 720         wrbuf_puts(c->wrbuf, "</session-status>\n");
 721         yaz_mutex_enter(http_sessions->mutex);
 722         p->activity_counter--;
 723     }
 724     yaz_mutex_leave(http_sessions->mutex);
 725 */
 726     response_close(c, "server-status");
 727     xmalloc_trav(0);
 728 }
 729
 730 static void bytarget_response(struct http_channel *c, struct http_session *s, const char *cmd_status) {
 731     int count, i;
 732     struct hitsbytarget *ht;
 733     struct http_request *rq = c->request;
 734     const char *settings = http_argbyname(rq, "settings");
 735     int version = get_version(rq);
 736     ht = get_hitsbytarget(s->psession, &count, c->nmem);
 737     if (!cmd_status)
 738         /* Old protocol, always ok */
 739         response_open(c, "bytarget");
 740     else {
 741         /* New protocol, OK or WARNING (...)*/
 742         response_open_no_status(c, "bytarget");
 743         wrbuf_printf(c->wrbuf, "<status>%s</status>", cmd_status);
 744     }
 745
 746     if (count == 0)
 747         session_log(s->psession, YLOG_WARN,
 748                     "Empty bytarget Response. No targets found!");
 749     for (i = 0; i < count; i++)
 750     {
 751         wrbuf_puts(c->wrbuf, "\n<target>");
 752
 753         wrbuf_puts(c->wrbuf, "<id>");
 754         wrbuf_xmlputs(c->wrbuf, ht[i].id);
 755         wrbuf_puts(c->wrbuf, "</id>\n");
 756
 757         if (ht[i].name && ht[i].name[0])
 758         {
 759             wrbuf_puts(c->wrbuf, "<name>");
 760             wrbuf_xmlputs(c->wrbuf, ht[i].name);
 761             wrbuf_puts(c->wrbuf, "</name>\n");
 762         }
 763
 764         wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", ht[i].hits);
 765         wrbuf_printf(c->wrbuf, "<diagnostic>%d</diagnostic>\n", ht[i].diagnostic);
 766         if (ht[i].diagnostic)
 767         {
 768             wrbuf_puts(c->wrbuf, "<message>");
 769             wrbuf_xmlputs(c->wrbuf, ht[i].message);
 770             wrbuf_puts(c->wrbuf, "</message>\n");
 771             wrbuf_puts(c->wrbuf, "<addinfo>");
 772             if (ht[i].addinfo)
 773                 wrbuf_xmlputs(c->wrbuf, ht[i].addinfo);
 774             wrbuf_puts(c->wrbuf, "</addinfo>\n");
 775         }
 776
 777         wrbuf_printf(c->wrbuf, "<records>%d</records>\n", ht[i].records - ht[i].filtered);
 778         if (version >= 2) {
 779             wrbuf_printf(c->wrbuf, "<filtered>%d</filtered>\n", ht[i].filtered);
 780             wrbuf_printf(c->wrbuf, "<approximation>" ODR_INT_PRINTF "</approximation>\n", ht[i].approximation);
 781         }
 782         wrbuf_puts(c->wrbuf, "<state>");
 783         wrbuf_xmlputs(c->wrbuf, ht[i].state);
 784         wrbuf_puts(c->wrbuf, "</state>\n");
 785         if (settings && *settings == '1')
 786         {
 787             wrbuf_puts(c->wrbuf, "<settings>\n");
 788             wrbuf_puts(c->wrbuf, ht[i].settings_xml);
 789             wrbuf_puts(c->wrbuf, "</settings>\n");
 790         }
 791         if (ht[i].suggestions_xml && ht[i].suggestions_xml[0]) {
 792             wrbuf_puts(c->wrbuf, "<suggestions>");
 793             wrbuf_puts(c->wrbuf, ht[i].suggestions_xml);
 794             wrbuf_puts(c->wrbuf, "</suggestions>");
 795         }
 796         wrbuf_puts(c->wrbuf, "</target>");
 797     }
 798     response_close(c, "bytarget");
 799 }
 800
 801 static void bytarget_result_ready(void *data)
 802 {
 803     struct http_channel *c = (struct http_channel *) data;
 804     struct http_session *s = locate_session(c);
 805     const char *status_message = "OK";
 806     if (s)
 807     {
 808         session_log(s->psession, c->http_sessions->log_level,
 809                     "bytarget watch released");
 810         bytarget_response(c, s, status_message);
 811         release_session(c, s);
 812     }
 813     else
 814         yaz_log(c->http_sessions->log_level,
 815                 "No Session found for released bytarget watch");
 816 }
 817
 818
 819 static void cmd_bytarget(struct http_channel *c)
 820 {
 821     struct http_request *rq = c->request;
 822     struct http_response *rs = c->response;
 823     struct http_session *s = locate_session(c);
 824     const char *block = http_argbyname(rq, "block");
 825     const char *report = http_argbyname(rq, "report");
 826     int report_error = 0;
 827     int report_status = 0;
 828     const char *status_message = "OK";
 829     int no_active;
 830
 831     if (report && !strcmp("error", report))
 832         report_error = 1;
 833     if (report && !strcmp("status", report))
 834         report_status = 1;
 835
 836     if (!s)
 837         return;
 838
 839     no_active = session_active_clients(s->psession);
 840     if (block && !strcmp("1", block) && no_active)
 841     {
 842         // if there is already a watch/block. we do not block this one
 843         if (session_set_watch(s->psession, SESSION_WATCH_BYTARGET,
 844                               bytarget_result_ready, c, c) != 0)
 845         {
 846             session_log(s->psession, YLOG_WARN, "Attempt to block "
 847                         "multiple times on bytarget block. Not supported!");
 848             if (report_error)
 849             {
 850                 error(rs, PAZPAR2_ALREADY_BLOCKED, "bytarget");
 851                 release_session(c, s);
 852                 return;
 853             }
 854             else if (report_status)
 855                 status_message = "WARNING (Already blocked on bytarget)";
 856             else {
 857                 session_log(s->psession, YLOG_WARN, "Ignoring bytarget block."
 858                             " Return current result.");
 859             }
 860         }
 861         else
 862         {
 863             session_log(s->psession, c->http_sessions->log_level,
 864                         "Blocking on command bytarget");
 865             release_session(c, s);
 866             return;
 867         }
 868     }
 869     bytarget_response(c, s, status_message);
 870     release_session(c, s);
 871 }
 872
 873 static void write_metadata(WRBUF w, struct conf_service *service,
 874                            struct record_metadata **ml, int full, int indent)
 875 {
 876     int imeta;
 877
 878     for (imeta = 0; imeta < service->num_metadata; imeta++)
 879     {
 880         struct conf_metadata *cmd = &service->metadata[imeta];
 881         struct record_metadata *md;
 882         if (!cmd->brief && !full)
 883             continue;
 884         for (md = ml[imeta]; md; md = md->next)
 885         {
 886             struct record_metadata_attr *attr = md->attributes;
 887             int i;
 888             for (i = 0; i < indent; i++)
 889                 wrbuf_putc(w, ' ');
 890             wrbuf_printf(w, "<md-%s", cmd->name);
 891
 892             for (; attr; attr = attr->next)
 893             {
 894                 wrbuf_printf(w, " %s=\"", attr->name);
 895                 wrbuf_xmlputs(w, attr->value);
 896                 wrbuf_puts(w, "\"");
 897             }
 898             wrbuf_puts(w, ">");
 899             switch (cmd->type)
 900             {
 901                 case Metadata_type_generic:
 902                     wrbuf_xmlputs(w, md->data.text.disp);
 903                     break;
 904                 case Metadata_type_year:
 905                     wrbuf_printf(w, "%d", md->data.number.min);
 906                     if (md->data.number.min != md->data.number.max)
 907                         wrbuf_printf(w, "-%d", md->data.number.max);
 908                     break;
 909                 default:
 910                     wrbuf_puts(w, "[can't represent]");
 911                     break;
 912             }
 913             wrbuf_printf(w, "</md-%s>\n", cmd->name);
 914         }
 915     }
 916 }
 917
 918 static void write_subrecord(struct record *r, WRBUF w,
 919         struct conf_service *service, int show_details)
 920 {
 921     const char *name = session_setting_oneval(
 922         client_get_database(r->client), PZ_NAME);
 923
 924     wrbuf_puts(w, " <location id=\"");
 925     wrbuf_xmlputs(w, client_get_id(r->client));
 926     wrbuf_puts(w, "\"\n");
 927
 928     wrbuf_puts(w, "    name=\"");
 929     wrbuf_xmlputs(w,  *name ? name : "Unknown");
 930     wrbuf_puts(w, "\" ");
 931
 932     wrbuf_puts(w, "checksum=\"");
 933     wrbuf_printf(w,  "%u", r->checksum);
 934     wrbuf_puts(w, "\">\n");
 935
 936     write_metadata(w, service, r->metadata, show_details, 2);
 937     wrbuf_puts(w, " </location>\n");
 938 }
 939
 940 static void show_raw_record_error(void *data, const char *addinfo)
 941 {
 942     http_channel_observer_t obs = data;
 943     struct http_channel *c = http_channel_observer_chan(obs);
 944     struct http_response *rs = c->response;
 945
 946     http_remove_observer(obs);
 947
 948     error(rs, PAZPAR2_RECORD_FAIL, addinfo);
 949 }
 950
 951 static void show_raw_record_ok(void *data, const char *buf, size_t sz)
 952 {
 953     http_channel_observer_t obs = data;
 954     struct http_channel *c = http_channel_observer_chan(obs);
 955     struct http_response *rs = c->response;
 956
 957     http_remove_observer(obs);
 958
 959     wrbuf_write(c->wrbuf, buf, sz);
 960     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 961     http_send_response(c);
 962 }
 963
 964
 965 static void show_raw_record_ok_binary(void *data, const char *buf, size_t sz)
 966 {
 967     http_channel_observer_t obs = data;
 968     struct http_channel *c = http_channel_observer_chan(obs);
 969     struct http_response *rs = c->response;
 970
 971     http_remove_observer(obs);
 972
 973     wrbuf_write(c->wrbuf, buf, sz);
 974     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 975
 976     rs->content_type = "application/octet-stream";
 977     http_send_response(c);
 978 }
 979
 980
 981 void show_raw_reset(void *data, struct http_channel *c, void *data2)
 982 {
 983     //struct client *client = data;
 984     //client_show_raw_remove(client, data2);
 985 }
 986
 987 static void cmd_record_ready(void *data);
 988
 989 static void show_record(struct http_channel *c, struct http_session *s)
 990 {
 991     struct http_response *rs = c->response;
 992     struct http_request *rq = c->request;
 993     struct record_cluster *rec, *prev_r, *next_r;
 994     struct conf_service *service;
 995     const char *idstr = http_argbyname(rq, "id");
 996     const char *offsetstr = http_argbyname(rq, "offset");
 997     const char *binarystr = http_argbyname(rq, "binary");
 998     const char *checksumstr = http_argbyname(rq, "checksum");
 999
1000     if (!s)
1001         return;
1002     service = s->psession->service;
1003     if (!idstr)
1004     {
1005         error(rs, PAZPAR2_MISSING_PARAMETER, "id");
1006         return;
1007     }
1008     wrbuf_rewind(c->wrbuf);
1009     if (!(rec = show_single_start(s->psession, idstr, &prev_r, &next_r)))
1010     {
1011         if (session_active_clients(s->psession) == 0)
1012         {
1013             error(rs, PAZPAR2_RECORD_MISSING, idstr);
1014         }
1015         else if (session_set_watch(s->psession, SESSION_WATCH_RECORD,
1016                               cmd_record_ready, c, c) != 0)
1017         {
1018             error(rs, PAZPAR2_RECORD_MISSING, idstr);
1019         }
1020         return;
1021     }
1022     if (offsetstr || checksumstr)
1023     {
1024         const char *syntax = http_argbyname(rq, "syntax");
1025         const char *esn = http_argbyname(rq, "esn");
1026         int i;
1027         struct record*r = rec->records;
1028         int binary = 0;
1029         const char *nativesyntax = http_argbyname(rq, "nativesyntax");
1030
1031         if (binarystr && *binarystr != '0')
1032             binary = 1;
1033
1034         if (checksumstr)
1035         {
1036             unsigned v = strtoul(checksumstr, 0, 10);
1037             for (i = 0; r; r = r->next)
1038                 if (v == r->checksum)
1039                     break;
1040             if (!r)
1041                 error(rs, PAZPAR2_RECORD_FAIL, "no record");
1042         }
1043         else
1044         {
1045             int offset = atoi(offsetstr);
1046             for (i = 0; i < offset && r; r = r->next, i++)
1047                 ;
1048             if (!r)
1049                 error(rs, PAZPAR2_RECORD_FAIL, "no record at offset given");
1050         }
1051         if (r)
1052         {
1053             http_channel_observer_t obs =
1054                 http_add_observer(c, r->client, show_raw_reset);
1055             int ret = client_show_raw_begin(r->client, r->position,
1056                                             syntax, esn,
1057                                             obs /* data */,
1058                                             show_raw_record_error,
1059                                             (binary ?
1060                                              show_raw_record_ok_binary :
1061                                              show_raw_record_ok),
1062                                             (binary ? 1 : 0),
1063                                             nativesyntax);
1064             if (ret == -1)
1065             {
1066                 http_remove_observer(obs);
1067                 error(rs, PAZPAR2_NO_SESSION, 0);
1068             }
1069         }
1070     }
1071     else
1072     {
1073         struct record *r;
1074         response_open_no_status(c, "record");
1075         wrbuf_puts(c->wrbuf, "\n <recid>");
1076         wrbuf_xmlputs(c->wrbuf, rec->recid);
1077         wrbuf_puts(c->wrbuf, "</recid>\n");
1078         if (prev_r)
1079         {
1080             wrbuf_puts(c->wrbuf, " <prevrecid>");
1081             wrbuf_xmlputs(c->wrbuf, prev_r->recid);
1082             wrbuf_puts(c->wrbuf, "</prevrecid>\n");
1083         }
1084         if (next_r)
1085         {
1086             wrbuf_puts(c->wrbuf, " <nextrecid>");
1087             wrbuf_xmlputs(c->wrbuf, next_r->recid);
1088             wrbuf_puts(c->wrbuf, "</nextrecid>\n");
1089         }
1090         wrbuf_printf(c->wrbuf, " <activeclients>%d</activeclients>\n",
1091                      session_active_clients(s->psession));
1092         write_metadata(c->wrbuf, service, rec->metadata, 1, 1);
1093         for (r = rec->records; r; r = r->next)
1094             write_subrecord(r, c->wrbuf, service, 2);
1095         response_close(c, "record");
1096     }
1097     show_single_stop(s->psession, rec);
1098 }
1099
1100 static void cmd_record_ready(void *data)
1101 {
1102     struct http_channel *c = (struct http_channel *) data;
1103     struct http_session *s = locate_session(c);
1104     if (s)
1105     {
1106         session_log(s->psession, c->http_sessions->log_level,
1107                     "record watch released");
1108         show_record(c, s);
1109         release_session(c,s);
1110     }
1111 }
1112
1113 static void cmd_record(struct http_channel *c)
1114 {
1115     struct http_session *s = locate_session(c);
1116     if (s) {
1117         show_record(c, s);
1118         release_session(c,s);
1119     }
1120 }
1121
1122
1123 static void show_records(struct http_channel *c, struct http_session *s, int active)
1124 {
1125     struct http_request *rq = c->request;
1126     struct http_response *rs = c->response;
1127     struct record_cluster **rl;
1128     struct reclist_sortparms *sp;
1129     const char *start = http_argbyname(rq, "start");
1130     const char *num = http_argbyname(rq, "num");
1131     const char *sort = http_argbyname(rq, "sort");
1132     int version = get_version(rq);
1133
1134     int startn = 0;
1135     int numn = 20;
1136     int total;
1137     Odr_int total_hits;
1138     Odr_int approx_hits;
1139     int i;
1140     struct conf_service *service = 0;
1141     if (!s)
1142         return;
1143
1144     // We haven't counted clients yet if we're called on a block release
1145     if (active < 0)
1146         active = session_active_clients(s->psession);
1147
1148     if (start)
1149         startn = atoi(start);
1150     if (num)
1151         numn = atoi(num);
1152
1153     service = s->psession->service;
1154     if (!sort) {
1155         sort = service->default_sort;
1156     }
1157     if (!(sp = reclist_parse_sortparms(c->nmem, sort, service)))
1158     {
1159         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1160         return;
1161
1162     }
1163
1164     rl = show_range_start(s->psession, sp, startn, &numn, &total,
1165                           &total_hits, &approx_hits, show_records_ready, c);
1166     if (!rl)
1167         return;
1168
1169     response_open(c, "show");
1170     wrbuf_printf(c->wrbuf, "\n<activeclients>%d</activeclients>\n", active);
1171     wrbuf_printf(c->wrbuf, "<merged>%d</merged>\n", total);
1172     wrbuf_printf(c->wrbuf, "<total>" ODR_INT_PRINTF "</total>\n", total_hits);
1173     if (version >= 2) {
1174         wrbuf_printf(c->wrbuf, "<approximation>" ODR_INT_PRINTF "</approximation>\n", approx_hits);
1175     }
1176     wrbuf_printf(c->wrbuf, "<start>%d</start>\n", startn);
1177     wrbuf_printf(c->wrbuf, "<num>%d</num>\n", numn);
1178
1179     for (i = 0; i < numn; i++)
1180     {
1181         int ccount;
1182         struct record *p;
1183         struct record_cluster *rec = rl[i];
1184         struct conf_service *service = s->psession->service;
1185
1186         wrbuf_puts(c->wrbuf, "<hit>\n");
1187         write_metadata(c->wrbuf, service, rec->metadata, 0, 1);
1188         for (ccount = 0, p = rl[i]->records; p;  p = p->next, ccount++)
1189             write_subrecord(p, c->wrbuf, service, 0); // subrecs w/o details
1190         wrbuf_printf(c->wrbuf, " <count>%d</count>\n", ccount);
1191         if (strstr(sort, "relevance"))
1192         {
1193             wrbuf_printf(c->wrbuf, " <relevance>%d</relevance>\n",
1194                          rec->relevance_score);
1195             if (service->rank_debug)
1196             {
1197                 wrbuf_printf(c->wrbuf, " <relevance_info>\n");
1198                 wrbuf_xmlputs(c->wrbuf, wrbuf_cstr(rec->relevance_explain1));
1199                 wrbuf_xmlputs(c->wrbuf, wrbuf_cstr(rec->relevance_explain2));
1200                 wrbuf_printf(c->wrbuf, " </relevance_info>\n");
1201             }
1202         }
1203         wrbuf_puts(c->wrbuf, " <recid>");
1204         wrbuf_xmlputs(c->wrbuf, rec->recid);
1205         wrbuf_puts(c->wrbuf, "</recid>\n");
1206         wrbuf_puts(c->wrbuf, "</hit>\n");
1207     }
1208
1209     show_range_stop(s->psession, rl);
1210
1211     response_close(c, "show");
1212 }
1213
1214 static void show_records_ready(void *data)
1215 {
1216     struct http_channel *c = (struct http_channel *) data;
1217     struct http_session *s = locate_session(c);
1218     if (s)
1219     {
1220         session_log(s->psession, c->http_sessions->log_level,
1221                     "show watch released");
1222         show_records(c, s, -1);
1223     }
1224     else {
1225         /* some error message  */
1226     }
1227     release_session(c,s);
1228 }
1229
1230 static void cmd_show(struct http_channel *c)
1231 {
1232     struct http_request  *rq = c->request;
1233     struct http_response *rs = c->response;
1234     struct http_session *s = locate_session(c);
1235     const char *block = http_argbyname(rq, "block");
1236     const char *sort = http_argbyname(rq, "sort");
1237     const char *block_error = http_argbyname(rq, "report");
1238     const char *mergekey = http_argbyname(rq, "mergekey");
1239     const char *rank = http_argbyname(rq, "rank");
1240     struct conf_service *service = 0;
1241
1242     struct reclist_sortparms *sp;
1243     int status;
1244     int report_error = 0;
1245     if (block_error && !strcmp("1", block_error)) {
1246         report_error = 1;
1247     }
1248     if (!s)
1249         return;
1250
1251     service = s->psession->service;
1252     if (!sort) {
1253         sort = service->default_sort;
1254     }
1255
1256     if (!(sp = reclist_parse_sortparms(c->nmem, sort, service)))
1257     {
1258         error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1259         release_session(c, s);
1260         return;
1261     }
1262     session_sort(s->psession, sp, mergekey, rank);
1263
1264     status = session_active_clients(s->psession);
1265
1266     if (block)
1267     {
1268         if (!strcmp(block, "preferred") && !session_is_preferred_clients_ready(s->psession) && reclist_get_num_records(s->psession->reclist) == 0)
1269         {
1270             // if there is already a watch/block. we do not block this one
1271             if (session_set_watch(s->psession, SESSION_WATCH_SHOW_PREF,
1272                                   show_records_ready, c, c) == 0)
1273             {
1274                 session_log(s->psession, c->http_sessions->log_level,
1275                             "Blocking on command show (preferred targets)");
1276                 release_session(c, s);
1277                 return;
1278             }
1279             else
1280             {
1281                 session_log(s->psession, YLOG_WARN, "Attempt to block"
1282                             " multiple times on show (preferred targets) block."
1283                             " Not supported!");
1284                 if (report_error)
1285                 {
1286                     error(rs, PAZPAR2_ALREADY_BLOCKED,
1287                           "show (preferred targets)");
1288                     release_session(c, s);
1289                     return;
1290                 }
1291                 else
1292                     session_log(s->psession, YLOG_WARN,
1293                                 "Ignoring show(preferred) block."
1294                                 " Returning current result");
1295             }
1296
1297         }
1298         else if (status)
1299         {
1300             // if there is already a watch/block. we do not block this one
1301             if (session_set_watch(s->psession, SESSION_WATCH_SHOW,
1302                                   show_records_ready, c, c) != 0)
1303             {
1304                 session_log(s->psession, YLOG_WARN, "Attempt to block"
1305                             " multiple times on show block. Not supported!");
1306                 if (report_error)
1307                 {
1308                     error(rs, PAZPAR2_ALREADY_BLOCKED, "show");
1309                     release_session(c, s);
1310                     return;
1311                 }
1312                 else
1313                     session_log(s->psession, YLOG_WARN, "Ignoring show block."
1314                                 " Returning current result");
1315             }
1316             else
1317             {
1318                 session_log(s->psession, c->http_sessions->log_level,
1319                             "Blocking on command show");
1320                 release_session(c, s);
1321                 return;
1322             }
1323         }
1324     }
1325     show_records(c, s, status);
1326     release_session(c, s);
1327 }
1328
1329 static void cmd_ping(struct http_channel *c)
1330 {
1331     struct http_session *s = locate_session(c);
1332     if (!s)
1333         return;
1334     response_open(c, "ping");
1335     response_close(c, "ping");
1336     release_session(c, s);
1337 }
1338
1339 static void cmd_search(struct http_channel *c)
1340 {
1341     struct http_request *rq = c->request;
1342     struct http_response *rs = c->response;
1343     struct http_session *s = locate_session(c);
1344     const char *query = http_argbyname(rq, "query");
1345     const char *filter = http_argbyname(rq, "filter");
1346     const char *maxrecs = http_argbyname(rq, "maxrecs");
1347     const char *startrecs = http_argbyname(rq, "startrecs");
1348     const char *limit = http_argbyname(rq, "limit");
1349     const char *sort = http_argbyname(rq, "sort");
1350     const char *mergekey = http_argbyname(rq, "mergekey");
1351     const char *rank = http_argbyname(rq, "rank");
1352     enum pazpar2_error_code code;
1353     const char *addinfo = 0;
1354     struct reclist_sortparms *sp;
1355     struct conf_service *service = 0;
1356
1357     if (!s)
1358         return;
1359
1360     if (!query)
1361     {
1362         error(rs, PAZPAR2_MISSING_PARAMETER, "query");
1363         release_session(c, s);
1364         return;
1365     }
1366     if (!yaz_utf8_check(query))
1367     {
1368         error(rs, PAZPAR2_MALFORMED_PARAMETER_ENCODING, "query");
1369         release_session(c, s);
1370         return;
1371     }
1372     service = s->psession->service;
1373     if (!sort) {
1374         sort = service->default_sort;
1375     }
1376     if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
1377     {
1378         error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1379         release_session(c, s);
1380         return;
1381     }
1382
1383     code = session_search(s->psession, query, startrecs, maxrecs, filter, limit,
1384                           &addinfo, sp, mergekey, rank);
1385     if (code)
1386     {
1387         error(rs, code, addinfo);
1388         release_session(c, s);
1389         return;
1390     }
1391     response_open(c, "search");
1392     response_close(c, "search");
1393     release_session(c, s);
1394 }
1395
1396
1397 static void cmd_stat(struct http_channel *c)
1398 {
1399     struct http_session *s = locate_session(c);
1400     struct statistics stat;
1401     int clients;
1402
1403     float progress = 0;
1404
1405     if (!s)
1406         return;
1407
1408     clients = session_active_clients(s->psession);
1409     statistics(s->psession, &stat);
1410
1411     if (stat.num_clients > 0)
1412     {
1413         progress = (stat.num_clients  - clients) / (float)stat.num_clients;
1414     }
1415
1416     response_open_no_status(c, "stat");
1417     wrbuf_printf(c->wrbuf, "\n <activeclients>%d</activeclients>\n", clients);
1418     wrbuf_printf(c->wrbuf, " <hits>" ODR_INT_PRINTF "</hits>\n", stat.num_hits);
1419     wrbuf_printf(c->wrbuf, " <records>%d</records>\n", stat.num_records);
1420     wrbuf_printf(c->wrbuf, " <clients>%d</clients>\n", stat.num_clients);
1421     wrbuf_printf(c->wrbuf, " <unconnected>%d</unconnected>\n", stat.num_no_connection);
1422     wrbuf_printf(c->wrbuf, " <connecting>%d</connecting>\n", stat.num_connecting);
1423     wrbuf_printf(c->wrbuf, " <working>%d</working>\n", stat.num_working);
1424     wrbuf_printf(c->wrbuf, " <idle>%d</idle>\n", stat.num_idle);
1425     wrbuf_printf(c->wrbuf, " <failed>%d</failed>\n", stat.num_failed);
1426     wrbuf_printf(c->wrbuf, " <error>%d</error>\n", stat.num_error);
1427     wrbuf_printf(c->wrbuf, " <progress>%.2f</progress>\n", progress);
1428     response_close(c, "stat");
1429     release_session(c, s);
1430 }
1431
1432 static void cmd_info(struct http_channel *c)
1433 {
1434     char yaz_version_str[20];
1435     char yaz_sha1_str[42];
1436
1437     response_open_no_status(c, "info");
1438     wrbuf_puts(c->wrbuf, "\n <version>\n");
1439     wrbuf_puts(c->wrbuf, "  <pazpar2");
1440 #ifdef PAZPAR2_VERSION_SHA1
1441     wrbuf_printf(c->wrbuf, " sha1=\"%s\"", PAZPAR2_VERSION_SHA1);
1442 #endif
1443     wrbuf_puts(c->wrbuf, ">");
1444     wrbuf_xmlputs(c->wrbuf, VERSION);
1445     wrbuf_puts(c->wrbuf, "</pazpar2>\n");
1446
1447     yaz_version(yaz_version_str, yaz_sha1_str);
1448     wrbuf_puts(c->wrbuf, "  <yaz compiled=\"");
1449     wrbuf_xmlputs(c->wrbuf, YAZ_VERSION);
1450     wrbuf_puts(c->wrbuf, "\" sha1=\"");
1451     wrbuf_xmlputs(c->wrbuf, yaz_sha1_str);
1452     wrbuf_puts(c->wrbuf, "\">");
1453     wrbuf_xmlputs(c->wrbuf, yaz_version_str);
1454     wrbuf_puts(c->wrbuf, "</yaz>\n");
1455
1456     wrbuf_puts(c->wrbuf, " </version>\n");
1457 #if HAVE_UNISTD_H
1458     {
1459         char hostname_str[64];
1460         if (gethostname(hostname_str, sizeof(hostname_str)) == 0)
1461         {
1462             wrbuf_puts(c->wrbuf, " <host>");
1463             wrbuf_xmlputs(c->wrbuf, hostname_str);
1464             wrbuf_puts(c->wrbuf, "</host>\n");
1465         }
1466     }
1467 #endif
1468     info_services(c->server, c->wrbuf);
1469
1470     response_close(c, "info");
1471 }
1472
1473 struct {
1474     char *name;
1475     void (*fun)(struct http_channel *c);
1476 } commands[] = {
1477     { "init", cmd_init },
1478     { "settings", cmd_settings },
1479     { "stat", cmd_stat },
1480     { "bytarget", cmd_bytarget },
1481     { "show", cmd_show },
1482     { "search", cmd_search },
1483     { "termlist", cmd_termlist },
1484     { "exit", cmd_exit },
1485     { "session-status", cmd_session_status },
1486     { "server-status", cmd_server_status },
1487     { "service", cmd_service },
1488     { "ping", cmd_ping },
1489     { "record", cmd_record },
1490     { "info", cmd_info },
1491     {0,0}
1492 };
1493
1494 void http_command(struct http_channel *c)
1495 {
1496     const char *command = http_argbyname(c->request, "command");
1497     struct http_response *rs = http_create_response(c);
1498     int i;
1499
1500     c->response = rs;
1501
1502     http_addheader(rs, "Expires", "Thu, 19 Nov 1981 08:52:00 GMT");
1503     http_addheader(rs, "Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
1504
1505     if (!command)
1506     {
1507         error(rs, PAZPAR2_MISSING_PARAMETER, "command");
1508         return;
1509     }
1510     for (i = 0; commands[i].name; i++)
1511         if (!strcmp(commands[i].name, command))
1512         {
1513             (*commands[i].fun)(c);
1514             break;
1515         }
1516     if (!commands[i].name)
1517         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "command");
1518
1519     return;
1520 }
1521
1522 /*
1523  * Local variables:
1524  * c-basic-offset: 4
1525  * c-file-style: "Stroustrup"
1526  * indent-tabs-mode: nil
1527  * End:
1528  * vim: shiftwidth=4 tabstop=8 expandtab
1529  */
1530