src/http_command.c

   1 /* This file is part of Pazpar2.
   2    Copyright (C) 2006-2011 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 #include <malloc.h>
  45
  46 void print_meminfo(WRBUF wrbuf) {
  47 #ifdef __GNUC__
  48     struct mallinfo minfo;
  49     minfo = mallinfo();
  50     wrbuf_printf(wrbuf, "  <memory>\n"
  51                         "   <arena>%d</arena>\n"
  52                         "   <uordblks>%d</uordblks>\n"
  53                         "   <fordblks>%d</fordblks>\n"
  54                         "   <ordblks>%d</ordblks>\n"
  55                         "   <keepcost>%d</keepcost>\n"
  56                         "   <hblks>%d</hblks>\n"
  57                         "   <hblkhd>%d</hblkhd>\n"
  58                         "   <virt>%d</virt>\n"
  59                         "   <virtuse>%d</virtuse>\n"
  60                         "  </memory>\n",
  61                  minfo.arena, minfo.uordblks, minfo.fordblks,minfo.ordblks, minfo.keepcost, minfo.hblks, minfo.hblkhd, minfo.arena + minfo.hblkhd, minfo.uordblks + minfo.hblkhd);
  62
  63 #endif
  64 }
  65
  66
  67 // Update this when the protocol changes
  68 #define PAZPAR2_PROTOCOL_VERSION "1"
  69
  70 #define HTTP_COMMAND_RESPONSE_PREFIX "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
  71
  72 struct http_session {
  73     IOCHAN timeout_iochan;     // NOTE: This is NOT associated with a socket
  74     struct session *psession;
  75     unsigned int session_id;
  76     int timestamp;
  77     int destroy_counter;
  78     int activity_counter;
  79     NMEM nmem;
  80     http_sessions_t http_sessions;
  81     struct http_session *next;
  82 };
  83
  84 struct http_sessions {
  85     struct http_session *session_list;
  86     YAZ_MUTEX mutex;
  87     int log_level;
  88 };
  89
  90 static YAZ_MUTEX g_http_session_mutex = 0;
  91 static int g_http_sessions = 0;
  92
  93 int http_session_use(int delta)
  94 {
  95     int sessions;
  96     if (!g_http_session_mutex)
  97         yaz_mutex_create(&g_http_session_mutex);
  98     yaz_mutex_enter(g_http_session_mutex);
  99     g_http_sessions += delta;
 100     sessions = g_http_sessions;
 101     yaz_mutex_leave(g_http_session_mutex);
 102     yaz_log(YLOG_DEBUG, "%s sesions=%d", delta == 0 ? "" : (delta > 0 ? "INC" : "DEC"), sessions);
 103     return sessions;
 104
 105 }
 106
 107 http_sessions_t http_sessions_create(void)
 108 {
 109     http_sessions_t hs = xmalloc(sizeof(*hs));
 110     hs->session_list = 0;
 111     hs->mutex = 0;
 112     pazpar2_mutex_create(&hs->mutex, "http_sessions");
 113     hs->log_level = yaz_log_module_level("HTTP");
 114     return hs;
 115 }
 116
 117 void http_sessions_destroy(http_sessions_t hs)
 118 {
 119     if (hs)
 120     {
 121         struct http_session *s = hs->session_list;
 122         while (s)
 123         {
 124             struct http_session *s_next = s->next;
 125             iochan_destroy(s->timeout_iochan);
 126             destroy_session(s->psession);
 127             nmem_destroy(s->nmem);
 128             s = s_next;
 129         }
 130         yaz_mutex_destroy(&hs->mutex);
 131         xfree(hs);
 132     }
 133 }
 134
 135 void http_session_destroy(struct http_session *s);
 136
 137 static void session_timeout(IOCHAN i, int event)
 138 {
 139     struct http_session *s = iochan_getdata(i);
 140     http_session_destroy(s);
 141 }
 142
 143 struct http_session *http_session_create(struct conf_service *service,
 144                                          http_sessions_t http_sessions,
 145                                          unsigned int sesid)
 146 {
 147     NMEM nmem = nmem_create();
 148     struct http_session *r = nmem_malloc(nmem, sizeof(*r));
 149     char tmp_str[50];
 150
 151     sprintf(tmp_str, "session#%u", sesid);
 152     r->psession = new_session(nmem, service, sesid);
 153     r->session_id = sesid;
 154     r->timestamp = 0;
 155     r->nmem = nmem;
 156     r->destroy_counter = r->activity_counter = 0;
 157     r->http_sessions = http_sessions;
 158
 159     yaz_mutex_enter(http_sessions->mutex);
 160     r->next = http_sessions->session_list;
 161     http_sessions->session_list = r;
 162     yaz_mutex_leave(http_sessions->mutex);
 163
 164     r->timeout_iochan = iochan_create(-1, session_timeout, 0, "http_session_timeout");
 165     iochan_setdata(r->timeout_iochan, r);
 166     yaz_log(http_sessions->log_level, "%p Session %u created. timeout chan=%p timeout=%d", r, sesid, r->timeout_iochan, service->session_timeout);
 167     iochan_settimeout(r->timeout_iochan, service->session_timeout);
 168
 169     iochan_add(service->server->iochan_man, r->timeout_iochan);
 170     http_session_use(1);
 171     return r;
 172 }
 173
 174 void http_session_destroy(struct http_session *s)
 175 {
 176     int must_destroy = 0;
 177
 178     http_sessions_t http_sessions = s->http_sessions;
 179
 180     yaz_log(http_sessions->log_level, "%p HTTP Session %u destroyed", s, s->session_id);
 181     yaz_mutex_enter(http_sessions->mutex);
 182     /* only if http_session has no active http sessions on it can be destroyed */
 183     if (s->destroy_counter == s->activity_counter) {
 184         struct http_session **p = 0;
 185         must_destroy = 1;
 186         for (p = &http_sessions->session_list; *p; p = &(*p)->next)
 187             if (*p == s)
 188             {
 189                 *p = (*p)->next;
 190                 break;
 191             }
 192     }
 193     yaz_mutex_leave(http_sessions->mutex);
 194     if (must_destroy)
 195     {   /* destroying for real */
 196         yaz_log(http_sessions->log_level, "%p HTTP Session %u destroyed", s, s->session_id);
 197         iochan_destroy(s->timeout_iochan);
 198         destroy_session(s->psession);
 199         http_session_use(-1);
 200         nmem_destroy(s->nmem);
 201     }
 202     else {
 203         yaz_log(http_sessions->log_level, "%p HTTP Session %u destroyed delayed. Active clients (%d-%d). Waiting for new timeout.",
 204                 s, s->session_id, s->activity_counter, s->destroy_counter);
 205     }
 206
 207 }
 208
 209 static const char *get_msg(enum pazpar2_error_code code)
 210 {
 211     struct pazpar2_error_msg {
 212         enum pazpar2_error_code code;
 213         const char *msg;
 214     };
 215     static const struct pazpar2_error_msg ar[] = {
 216         { PAZPAR2_NO_SESSION, "Session does not exist or it has expired"},
 217         { PAZPAR2_MISSING_PARAMETER, "Missing parameter"},
 218         { PAZPAR2_MALFORMED_PARAMETER_VALUE, "Malformed parameter value"},
 219         { PAZPAR2_MALFORMED_PARAMETER_ENCODING, "Malformed parameter encoding"},
 220         { PAZPAR2_MALFORMED_SETTING, "Malformed setting argument"},
 221         { PAZPAR2_HITCOUNTS_FAILED, "Failed to retrieve hitcounts"},
 222         { PAZPAR2_RECORD_MISSING, "Record missing"},
 223         { PAZPAR2_NO_TARGETS, "No targets"},
 224         { PAZPAR2_CONFIG_TARGET, "Target cannot be configured"},
 225         { PAZPAR2_RECORD_FAIL, "Record command failed"},
 226         { PAZPAR2_NOT_IMPLEMENTED, "Not implemented"},
 227         { PAZPAR2_NO_SERVICE, "No service"},
 228         { PAZPAR2_LAST_ERROR, "Last error"},
 229         { 0, 0 }
 230     };
 231     int i = 0;
 232     while (ar[i].msg)
 233     {
 234         if (code == ar[i].code)
 235             return ar[i].msg;
 236         i++;
 237     }
 238     return "No error";
 239 }
 240
 241 static void error(struct http_response *rs,
 242                   enum pazpar2_error_code code,
 243                   const char *addinfo)
 244 {
 245     struct http_channel *c = rs->channel;
 246     WRBUF text = wrbuf_alloc();
 247     const char *http_status = "417";
 248     const char *msg = get_msg(code);
 249
 250     rs->msg = nmem_strdup(c->nmem, msg);
 251     strcpy(rs->code, http_status);
 252
 253     wrbuf_printf(text, HTTP_COMMAND_RESPONSE_PREFIX "<error code=\"%d\" msg=\"%s\">", (int) code,
 254                msg);
 255     if (addinfo)
 256         wrbuf_xmlputs(text, addinfo);
 257     wrbuf_puts(text, "</error>");
 258
 259     yaz_log(YLOG_WARN, "HTTP %s %s%s%s", http_status,
 260             msg, addinfo ? ": " : "" , addinfo ? addinfo : "");
 261     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(text));
 262     wrbuf_destroy(text);
 263     http_send_response(c);
 264 }
 265
 266 unsigned int make_sessionid(void)
 267 {
 268     static int seq = 0; /* thread pr */
 269     unsigned int res;
 270
 271     seq++;
 272     if (global_parameters.predictable_sessions)
 273         res = seq;
 274     else
 275     {
 276 #ifdef WIN32
 277         res = seq;
 278 #else
 279         struct timeval t;
 280
 281         if (gettimeofday(&t, 0) < 0)
 282         {
 283             yaz_log(YLOG_WARN|YLOG_ERRNO, "gettimeofday");
 284             exit(1);
 285         }
 286         /* at most 256 sessions per second ..
 287            (long long would be more appropriate)*/
 288         res = t.tv_sec;
 289         res = ((res << 8) | (seq & 0xff)) & ((1U << 31) - 1);
 290 #endif
 291     }
 292     return res;
 293 }
 294
 295 static struct http_session *locate_session(struct http_channel *c)
 296 {
 297     struct http_response *rs = c->response;
 298     struct http_request *rq = c->request;
 299     struct http_session *p;
 300     const char *session = http_argbyname(rq, "session");
 301     http_sessions_t http_sessions = c->http_sessions;
 302     unsigned int id;
 303
 304     if (!session)
 305     {
 306         error(rs, PAZPAR2_MISSING_PARAMETER, "session");
 307         return 0;
 308     }
 309     id = atoi(session);
 310     yaz_mutex_enter(http_sessions->mutex);
 311     for (p = http_sessions->session_list; p; p = p->next)
 312         if (id == p->session_id)
 313             break;
 314     if (p)
 315         p->activity_counter++;
 316     yaz_mutex_leave(http_sessions->mutex);
 317     if (p)
 318         iochan_activity(p->timeout_iochan);
 319     else
 320         error(rs, PAZPAR2_NO_SESSION, session);
 321     return p;
 322 }
 323
 324 // Call after use of locate_session, in order to increment the destroy_counter
 325 static void release_session(struct http_channel *c, struct http_session *session) {
 326     http_sessions_t http_sessions = c->http_sessions;
 327     yaz_mutex_enter(http_sessions->mutex);
 328     if (session)
 329         session->destroy_counter++;
 330     yaz_mutex_leave(http_sessions->mutex);
 331 }
 332
 333 // Decode settings parameters and apply to session
 334 // Syntax: setting[target]=value
 335 static int process_settings(struct session *se, struct http_request *rq,
 336                             struct http_response *rs)
 337 {
 338     struct http_argument *a;
 339
 340     for (a = rq->arguments; a; a = a->next)
 341         if (strchr(a->name, '['))
 342         {
 343             char **res;
 344             int num;
 345             char *dbname;
 346             char *setting;
 347
 348             // Nmem_strsplit *rules*!!!
 349             nmem_strsplit(se->session_nmem, "[]", a->name, &res, &num);
 350             if (num != 2)
 351             {
 352                 error(rs, PAZPAR2_MALFORMED_SETTING, a->name);
 353                 return -1;
 354             }
 355             setting = res[0];
 356             dbname = res[1];
 357             session_apply_setting(se, dbname, setting,
 358                     nmem_strdup(se->session_nmem, a->value));
 359         }
 360     return 0;
 361 }
 362
 363 static void cmd_exit(struct http_channel *c)
 364 {
 365     yaz_log(YLOG_WARN, "exit");
 366     http_close_server(c->server);
 367 }
 368
 369 static void cmd_init(struct http_channel *c)
 370 {
 371     char buf[1024];
 372     struct http_request *r = c->request;
 373     const char *clear = http_argbyname(r, "clear");
 374     const char *content_type = http_lookup_header(r->headers, "Content-Type");
 375     unsigned int sesid;
 376     struct http_session *s;
 377     struct http_response *rs = c->response;
 378     struct conf_service *service = 0; /* no service (yet) */
 379
 380     if (r->content_len && content_type &&
 381         !yaz_strcmp_del("text/xml", content_type, "; "))
 382     {
 383         xmlDoc *doc = xmlParseMemory(r->content_buf, r->content_len);
 384         xmlNode *root_n;
 385         if (!doc)
 386         {
 387             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 388             return;
 389         }
 390         root_n = xmlDocGetRootElement(doc);
 391         service = service_create(c->server, root_n);
 392         xmlFreeDoc(doc);
 393         if (!service)
 394         {
 395             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 396             return;
 397         }
 398     }
 399
 400     if (!service)
 401     {
 402         const char *service_name = http_argbyname(c->request, "service");
 403         service = locate_service(c->server, service_name);
 404         if (!service)
 405         {
 406             error(rs, PAZPAR2_NO_SERVICE, service_name ? service_name : "unnamed");
 407             return;
 408         }
 409     }
 410     sesid = make_sessionid();
 411     s = http_session_create(service, c->http_sessions, sesid);
 412
 413     yaz_log(c->http_sessions->log_level, "%p Session init %u ", s, sesid);
 414     if (!clear || *clear == '0')
 415         session_init_databases(s->psession);
 416     else
 417         yaz_log(YLOG_LOG, "HTTP Session %u init: No databases preloaded", sesid);
 418
 419     if (process_settings(s->psession, c->request, c->response) < 0)
 420         return;
 421
 422     sprintf(buf, HTTP_COMMAND_RESPONSE_PREFIX
 423             "<init><status>OK</status><session>%d", sesid);
 424     if (c->server->server_id)
 425     {
 426         strcat(buf, ".");
 427         strcat(buf, c->server->server_id);
 428     }
 429     strcat(buf, "</session>"
 430            "<protocol>" PAZPAR2_PROTOCOL_VERSION "</protocol></init>");
 431     rs->payload = nmem_strdup(c->nmem, buf);
 432     http_send_response(c);
 433 }
 434
 435 static void apply_local_setting(void *client_data,
 436                                 struct setting *set)
 437 {
 438     struct session *se =  (struct session *) client_data;
 439
 440     session_apply_setting(se, nmem_strdup(se->session_nmem, set->target),
 441                           nmem_strdup(se->session_nmem, set->name),
 442                           nmem_strdup(se->session_nmem, set->value));
 443 }
 444
 445 static void cmd_settings(struct http_channel *c)
 446 {
 447     struct http_response *rs = c->response;
 448     struct http_request *rq = c->request;
 449     struct http_session *s = locate_session(c);
 450     const char *content_type = http_lookup_header(rq->headers, "Content-Type");
 451
 452     if (!s)
 453         return;
 454
 455     if (rq->content_len && content_type &&
 456         !yaz_strcmp_del("text/xml", content_type, "; "))
 457     {
 458         xmlDoc *doc = xmlParseMemory(rq->content_buf, rq->content_len);
 459         xmlNode *root_n;
 460         if (!doc)
 461         {
 462             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 463             return;
 464         }
 465         root_n = xmlDocGetRootElement(doc);
 466
 467         settings_read_node_x(root_n, s->psession, apply_local_setting);
 468
 469         xmlFreeDoc(doc);
 470     }
 471     if (process_settings(s->psession, rq, rs) < 0) {
 472         release_session(c,s);
 473         return;
 474     }
 475     rs->payload = HTTP_COMMAND_RESPONSE_PREFIX "<settings><status>OK</status></settings>";
 476     http_send_response(c);
 477     release_session(c,s);
 478 }
 479
 480 // Compares two hitsbytarget nodes by hitcount
 481 static int cmp_ht(const void *p1, const void *p2)
 482 {
 483     const struct hitsbytarget *h1 = p1;
 484     const struct hitsbytarget *h2 = p2;
 485     return h2->hits - h1->hits;
 486 }
 487
 488 // This implements functionality somewhat similar to 'bytarget', but in a termlist form
 489 static int targets_termlist(WRBUF wrbuf, struct session *se, int num,
 490                              NMEM nmem)
 491 {
 492     struct hitsbytarget *ht;
 493     int count, i;
 494
 495     ht = hitsbytarget(se, &count, nmem);
 496     qsort(ht, count, sizeof(struct hitsbytarget), cmp_ht);
 497     for (i = 0; i < count && i < num && ht[i].hits > 0; i++)
 498     {
 499
 500         // do only print terms which have display names
 501
 502         wrbuf_puts(wrbuf, "<term>\n");
 503
 504         wrbuf_puts(wrbuf, "<id>");
 505         wrbuf_xmlputs(wrbuf, ht[i].id);
 506         wrbuf_puts(wrbuf, "</id>\n");
 507
 508         wrbuf_puts(wrbuf, "<name>");
 509         if (!ht[i].name || !ht[i].name[0])
 510             wrbuf_xmlputs(wrbuf, "NO TARGET NAME");
 511         else
 512             wrbuf_xmlputs(wrbuf, ht[i].name);
 513         wrbuf_puts(wrbuf, "</name>\n");
 514
 515         wrbuf_printf(wrbuf, "<frequency>" ODR_INT_PRINTF "</frequency>\n",
 516                      ht[i].hits);
 517
 518         wrbuf_puts(wrbuf, "<state>");
 519         wrbuf_xmlputs(wrbuf, ht[i].state);
 520         wrbuf_puts(wrbuf, "</state>\n");
 521
 522         wrbuf_printf(wrbuf, "<diagnostic>%d</diagnostic>\n",
 523                      ht[i].diagnostic);
 524         wrbuf_puts(wrbuf, "</term>\n");
 525     }
 526     return count;
 527 }
 528
 529 static void cmd_termlist(struct http_channel *c)
 530 {
 531     struct http_response *rs = c->response;
 532     struct http_request *rq = c->request;
 533     struct http_session *s = locate_session(c);
 534     struct termlist_score **p;
 535     int len;
 536     int i;
 537     const char *name = http_argbyname(rq, "name");
 538     const char *nums = http_argbyname(rq, "num");
 539     int num = 15;
 540     int status;
 541     WRBUF debug_log = wrbuf_alloc();
 542
 543     if (!s)
 544         return;
 545
 546     status = session_active_clients(s->psession);
 547
 548     if (!name)
 549         name = "subject";
 550     if (strlen(name) > 255)
 551         return;
 552     if (nums)
 553         num = atoi(nums);
 554
 555     wrbuf_rewind(c->wrbuf);
 556
 557     wrbuf_puts(c->wrbuf, "<termlist>\n");
 558     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", status);
 559     while (*name)
 560     {
 561         char tname[256];
 562         const char *tp;
 563
 564         if (!(tp = strchr(name, ',')))
 565             tp = name + strlen(name);
 566         strncpy(tname, name, tp - name);
 567         tname[tp - name] = '\0';
 568         wrbuf_puts(c->wrbuf, "<list name=\"");
 569         wrbuf_xmlputs(c->wrbuf, tname);
 570         wrbuf_puts(c->wrbuf, "\">\n");
 571         if (!strcmp(tname, "xtargets")) {
 572             int targets = targets_termlist(c->wrbuf, s->psession, num, c->nmem);
 573             wrbuf_printf(debug_log, " xtargets: %d", targets);
 574         }
 575         else
 576         {
 577             p = termlist(s->psession, tname, &len);
 578             if (p && len)
 579                 wrbuf_printf(debug_log, " %s: %d", tname, len);
 580             if (p) {
 581                 for (i = 0; i < len && i < num; i++){
 582                     // prevnt sending empty term elements
 583                     if (!p[i]->term || !p[i]->term[0])
 584                         continue;
 585
 586                     wrbuf_puts(c->wrbuf, "<term>");
 587                     wrbuf_puts(c->wrbuf, "<name>");
 588                     wrbuf_xmlputs(c->wrbuf, p[i]->term);
 589                     wrbuf_puts(c->wrbuf, "</name>");
 590
 591                     wrbuf_printf(c->wrbuf,
 592                                  "<frequency>%d</frequency>",
 593                                  p[i]->frequency);
 594                     wrbuf_puts(c->wrbuf, "</term>\n");
 595                }
 596             }
 597         }
 598         wrbuf_puts(c->wrbuf, "</list>\n");
 599         name = tp;
 600         if (*name == ',')
 601             name++;
 602     }
 603     wrbuf_puts(c->wrbuf, "</termlist>\n");
 604     yaz_log(YLOG_DEBUG, "termlist response: %s ", wrbuf_cstr(debug_log));
 605     wrbuf_destroy(debug_log);
 606     rs->payload = nmem_strdup(rq->channel->nmem, wrbuf_cstr(c->wrbuf));
 607     http_send_response(c);
 608     release_session(c,s);
 609 }
 610
 611 size_t session_get_memory_status(struct session *session);
 612
 613 static void session_status(struct http_channel *c, struct http_session *s)
 614 {
 615     size_t session_nmem;
 616     wrbuf_printf(c->wrbuf, "<http_count>%u</http_count>\n", s->activity_counter);
 617     wrbuf_printf(c->wrbuf, "<http_nmem>%zu</http_nmem>\n", nmem_total(s->nmem) );
 618     session_nmem = session_get_memory_status(s->psession);
 619     wrbuf_printf(c->wrbuf, "<session_nmem>%zu</session_nmem>\n", session_nmem);
 620 }
 621
 622 static void cmd_session_status(struct http_channel *c) {
 623     struct http_response *rs = c->response;
 624     struct http_session *s = locate_session(c);
 625     if (!s)
 626         return;
 627
 628     wrbuf_rewind(c->wrbuf);
 629     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<sessionstatus><status>OK</status>\n");
 630     session_status(c, s);
 631     wrbuf_puts(c->wrbuf, "</sessionstatus>\n");
 632     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 633     http_send_response(c);
 634     release_session(c,s);
 635
 636 }
 637
 638 int sessions_count(void);
 639 int clients_count(void);
 640 #ifdef HAVE_RESULTSETS_COUNT
 641 int resultsets_count(void);
 642 #else
 643 #define resultsets_count()      0
 644 #endif
 645
 646 static void cmd_server_status(struct http_channel *c)
 647 {
 648     struct http_response *rs = c->response;
 649     int sessions   = sessions_count();
 650     int clients    = clients_count();
 651     int resultsets = resultsets_count();
 652     wrbuf_rewind(c->wrbuf);
 653     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<server-status>\n");
 654     wrbuf_printf(c->wrbuf, "  <sessions>%u</sessions>\n", sessions);
 655     wrbuf_printf(c->wrbuf, "  <clients>%u</clients>\n",   clients);
 656     /* Only works if yaz has been compiled with enabling of this */
 657     wrbuf_printf(c->wrbuf, "  <resultsets>%u</resultsets>\n",resultsets);
 658     print_meminfo(c->wrbuf);
 659
 660 /* TODO add all sessions status                         */
 661 /*    http_sessions_t http_sessions = c->http_sessions; */
 662 /*    struct http_session *p;                           */
 663 /*
 664     yaz_mutex_enter(http_sessions->mutex);
 665     for (p = http_sessions->session_list; p; p = p->next) {
 666         p->activity_counter++;
 667         wrbuf_puts(c->wrbuf, "<session-status>\n");
 668         wrbuf_printf(c->wrbuf, "<id>%s</id>\n", p->session_id);
 669         yaz_mutex_leave(http_sessions->mutex);
 670         session_status(c, p);
 671         wrbuf_puts(c->wrbuf, "</session-status>\n");
 672         yaz_mutex_enter(http_sessions->mutex);
 673         p->activity_counter--;
 674     }
 675     yaz_mutex_leave(http_sessions->mutex);
 676 */
 677     wrbuf_puts(c->wrbuf, "</server-status>\n");
 678     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 679     http_send_response(c);
 680     xmalloc_trav(0);
 681 }
 682
 683
 684 static void cmd_bytarget(struct http_channel *c)
 685 {
 686     struct http_response *rs = c->response;
 687     struct http_request *rq = c->request;
 688     struct http_session *s = locate_session(c);
 689     struct hitsbytarget *ht;
 690     const char *settings = http_argbyname(rq, "settings");
 691     int count, i;
 692
 693     if (!s)
 694         return;
 695     ht = hitsbytarget(s->psession, &count, c->nmem);
 696     wrbuf_rewind(c->wrbuf);
 697     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<bytarget><status>OK</status>");
 698
 699     for (i = 0; i < count; i++)
 700     {
 701         wrbuf_puts(c->wrbuf, "\n<target>");
 702
 703         wrbuf_puts(c->wrbuf, "<id>");
 704         wrbuf_xmlputs(c->wrbuf, ht[i].id);
 705         wrbuf_puts(c->wrbuf, "</id>\n");
 706
 707         if (ht[i].name && ht[i].name[0])
 708         {
 709             wrbuf_puts(c->wrbuf, "<name>");
 710             wrbuf_xmlputs(c->wrbuf, ht[i].name);
 711             wrbuf_puts(c->wrbuf, "</name>\n");
 712         }
 713
 714         wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", ht[i].hits);
 715         wrbuf_printf(c->wrbuf, "<diagnostic>%d</diagnostic>\n", ht[i].diagnostic);
 716         wrbuf_printf(c->wrbuf, "<records>%d</records>\n", ht[i].records);
 717
 718         wrbuf_puts(c->wrbuf, "<state>");
 719         wrbuf_xmlputs(c->wrbuf, ht[i].state);
 720         wrbuf_puts(c->wrbuf, "</state>\n");
 721         if (settings && *settings == '1')
 722         {
 723             wrbuf_puts(c->wrbuf, "<settings>\n");
 724             wrbuf_puts(c->wrbuf, ht[i].settings_xml);
 725             wrbuf_puts(c->wrbuf, "</settings>\n");
 726         }
 727         wrbuf_puts(c->wrbuf, "</target>");
 728     }
 729
 730     wrbuf_puts(c->wrbuf, "</bytarget>");
 731     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 732     http_send_response(c);
 733     release_session(c,s);
 734 }
 735
 736 static void write_metadata(WRBUF w, struct conf_service *service,
 737         struct record_metadata **ml, int full)
 738 {
 739     int imeta;
 740
 741     for (imeta = 0; imeta < service->num_metadata; imeta++)
 742     {
 743         struct conf_metadata *cmd = &service->metadata[imeta];
 744         struct record_metadata *md;
 745         if (!cmd->brief && !full)
 746             continue;
 747         for (md = ml[imeta]; md; md = md->next)
 748         {
 749             struct record_metadata_attr *attr = md->attributes;
 750             wrbuf_printf(w, "\n<md-%s", cmd->name);
 751
 752             for (; attr; attr = attr->next)
 753             {
 754                 wrbuf_printf(w, " %s=\"", attr->name);
 755                 wrbuf_xmlputs(w, attr->value);
 756                 wrbuf_puts(w, "\"");
 757             }
 758             wrbuf_puts(w, ">");
 759             switch (cmd->type)
 760             {
 761                 case Metadata_type_generic:
 762                     wrbuf_xmlputs(w, md->data.text.disp);
 763                     break;
 764                 case Metadata_type_year:
 765                     wrbuf_printf(w, "%d", md->data.number.min);
 766                     if (md->data.number.min != md->data.number.max)
 767                         wrbuf_printf(w, "-%d", md->data.number.max);
 768                     break;
 769                 default:
 770                     wrbuf_puts(w, "[can't represent]");
 771             }
 772             wrbuf_printf(w, "</md-%s>", cmd->name);
 773         }
 774     }
 775 }
 776
 777 static void write_subrecord(struct record *r, WRBUF w,
 778         struct conf_service *service, int show_details)
 779 {
 780     const char *name = session_setting_oneval(
 781         client_get_database(r->client), PZ_NAME);
 782
 783     wrbuf_puts(w, "<location id=\"");
 784     wrbuf_xmlputs(w, client_get_database(r->client)->database->url);
 785     wrbuf_puts(w, "\" ");
 786
 787     wrbuf_puts(w, "name=\"");
 788     wrbuf_xmlputs(w,  *name ? name : "Unknown");
 789     wrbuf_puts(w, "\">");
 790
 791     write_metadata(w, service, r->metadata, show_details);
 792     wrbuf_puts(w, "</location>\n");
 793 }
 794
 795 static void show_raw_record_error(void *data, const char *addinfo)
 796 {
 797     http_channel_observer_t obs = data;
 798     struct http_channel *c = http_channel_observer_chan(obs);
 799     struct http_response *rs = c->response;
 800
 801     http_remove_observer(obs);
 802
 803     error(rs, PAZPAR2_RECORD_FAIL, addinfo);
 804 }
 805
 806 static void show_raw_record_ok(void *data, const char *buf, size_t sz)
 807 {
 808     http_channel_observer_t obs = data;
 809     struct http_channel *c = http_channel_observer_chan(obs);
 810     struct http_response *rs = c->response;
 811
 812     http_remove_observer(obs);
 813
 814     wrbuf_write(c->wrbuf, buf, sz);
 815     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 816     http_send_response(c);
 817 }
 818
 819
 820 static void show_raw_record_ok_binary(void *data, const char *buf, size_t sz)
 821 {
 822     http_channel_observer_t obs = data;
 823     struct http_channel *c = http_channel_observer_chan(obs);
 824     struct http_response *rs = c->response;
 825
 826     http_remove_observer(obs);
 827
 828     wrbuf_write(c->wrbuf, buf, sz);
 829     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 830
 831     rs->content_type = "application/octet-stream";
 832     http_send_response(c);
 833 }
 834
 835
 836 void show_raw_reset(void *data, struct http_channel *c, void *data2)
 837 {
 838     //struct client *client = data;
 839     //client_show_raw_remove(client, data2);
 840 }
 841
 842 static void cmd_record_ready(void *data);
 843
 844 static void cmd_record(struct http_channel *c)
 845 {
 846     struct http_response *rs = c->response;
 847     struct http_request *rq = c->request;
 848     struct http_session *s = locate_session(c);
 849     struct record_cluster *rec, *prev_r, *next_r;
 850     struct record *r;
 851     struct conf_service *service;
 852     const char *idstr = http_argbyname(rq, "id");
 853     const char *offsetstr = http_argbyname(rq, "offset");
 854     const char *binarystr = http_argbyname(rq, "binary");
 855
 856     if (!s)
 857         return;
 858     service = s->psession->service;
 859     if (!idstr)
 860     {
 861         error(rs, PAZPAR2_MISSING_PARAMETER, "id");
 862         return;
 863     }
 864     wrbuf_rewind(c->wrbuf);
 865     if (!(rec = show_single_start(s->psession, idstr, &prev_r, &next_r)))
 866     {
 867         if (session_active_clients(s->psession) == 0)
 868         {
 869             error(rs, PAZPAR2_RECORD_MISSING, idstr);
 870         }
 871         else if (session_set_watch(s->psession, SESSION_WATCH_RECORD,
 872                               cmd_record_ready, c, c) != 0)
 873         {
 874             error(rs, PAZPAR2_RECORD_MISSING, idstr);
 875         }
 876         release_session(c, s);
 877         return;
 878     }
 879     if (offsetstr)
 880     {
 881         int offset = atoi(offsetstr);
 882         const char *syntax = http_argbyname(rq, "syntax");
 883         const char *esn = http_argbyname(rq, "esn");
 884         int i;
 885         struct record*r = rec->records;
 886         int binary = 0;
 887
 888         if (binarystr && *binarystr != '0')
 889             binary = 1;
 890
 891         for (i = 0; i < offset && r; r = r->next, i++)
 892             ;
 893         if (!r)
 894         {
 895             error(rs, PAZPAR2_RECORD_FAIL, "no record at offset given");
 896         }
 897         else
 898         {
 899             http_channel_observer_t obs =
 900                 http_add_observer(c, r->client, show_raw_reset);
 901             int ret = client_show_raw_begin(r->client, r->position,
 902                                         syntax, esn,
 903                                         obs /* data */,
 904                                         show_raw_record_error,
 905                                         (binary ?
 906                                          show_raw_record_ok_binary :
 907                                          show_raw_record_ok),
 908                                         (binary ? 1 : 0));
 909             if (ret == -1)
 910             {
 911                 http_remove_observer(obs);
 912                 error(rs, PAZPAR2_NO_SESSION, 0);
 913             }
 914         }
 915     }
 916     else
 917     {
 918         wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<record>\n");
 919         wrbuf_puts(c->wrbuf, "<recid>");
 920         wrbuf_xmlputs(c->wrbuf, rec->recid);
 921         wrbuf_puts(c->wrbuf, "</recid>\n");
 922         if (prev_r)
 923         {
 924             wrbuf_puts(c->wrbuf, "<prevrecid>");
 925             wrbuf_xmlputs(c->wrbuf, prev_r->recid);
 926             wrbuf_puts(c->wrbuf, "</prevrecid>\n");
 927         }
 928         if (next_r)
 929         {
 930             wrbuf_puts(c->wrbuf, "<nextrecid>");
 931             wrbuf_xmlputs(c->wrbuf, next_r->recid);
 932             wrbuf_puts(c->wrbuf, "</nextrecid>\n");
 933         }
 934         wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n",
 935                      session_active_clients(s->psession));
 936         write_metadata(c->wrbuf, service, rec->metadata, 1);
 937         for (r = rec->records; r; r = r->next)
 938             write_subrecord(r, c->wrbuf, service, 1);
 939         wrbuf_puts(c->wrbuf, "</record>\n");
 940         rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 941         http_send_response(c);
 942     }
 943     show_single_stop(s->psession, rec);
 944     release_session(c, s);
 945 }
 946
 947 static void cmd_record_ready(void *data)
 948 {
 949     struct http_channel *c = (struct http_channel *) data;
 950
 951     cmd_record(c);
 952 }
 953
 954 static void show_records(struct http_channel *c, int active)
 955 {
 956     struct http_request *rq = c->request;
 957     struct http_response *rs = c->response;
 958     struct http_session *s = locate_session(c);
 959     struct record_cluster **rl;
 960     struct reclist_sortparms *sp;
 961     const char *start = http_argbyname(rq, "start");
 962     const char *num = http_argbyname(rq, "num");
 963     const char *sort = http_argbyname(rq, "sort");
 964     int startn = 0;
 965     int numn = 20;
 966     int total;
 967     Odr_int total_hits;
 968     int i;
 969
 970     if (!s)
 971         return;
 972
 973     // We haven't counted clients yet if we're called on a block release
 974     if (active < 0)
 975         active = session_active_clients(s->psession);
 976
 977     if (start)
 978         startn = atoi(start);
 979     if (num)
 980         numn = atoi(num);
 981     if (!sort)
 982         sort = "relevance";
 983     if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
 984     {
 985         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
 986         release_session(c, s);
 987         return;
 988     }
 989
 990
 991     rl = show_range_start(s->psession, sp, startn, &numn, &total, &total_hits);
 992
 993     wrbuf_rewind(c->wrbuf);
 994     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<show>\n<status>OK</status>\n");
 995     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", active);
 996     wrbuf_printf(c->wrbuf, "<merged>%d</merged>\n", total);
 997     wrbuf_printf(c->wrbuf, "<total>" ODR_INT_PRINTF "</total>\n", total_hits);
 998     wrbuf_printf(c->wrbuf, "<start>%d</start>\n", startn);
 999     wrbuf_printf(c->wrbuf, "<num>%d</num>\n", numn);
1000
1001     for (i = 0; i < numn; i++)
1002     {
1003         int ccount;
1004         struct record *p;
1005         struct record_cluster *rec = rl[i];
1006         struct conf_service *service = s->psession->service;
1007
1008         wrbuf_puts(c->wrbuf, "<hit>\n");
1009         write_metadata(c->wrbuf, service, rec->metadata, 0);
1010         for (ccount = 0, p = rl[i]->records; p;  p = p->next, ccount++)
1011             write_subrecord(p, c->wrbuf, service, 0); // subrecs w/o details
1012         if (ccount > 1)
1013             wrbuf_printf(c->wrbuf, "<count>%d</count>\n", ccount);
1014         if (strstr(sort, "relevance"))
1015             wrbuf_printf(c->wrbuf, "<relevance>%d</relevance>\n",
1016                          rec->relevance_score);
1017         wrbuf_puts(c->wrbuf, "<recid>");
1018         wrbuf_xmlputs(c->wrbuf, rec->recid);
1019         wrbuf_puts(c->wrbuf, "</recid>\n");
1020         wrbuf_puts(c->wrbuf, "</hit>\n");
1021     }
1022
1023     show_range_stop(s->psession, rl);
1024
1025     wrbuf_puts(c->wrbuf, "</show>\n");
1026     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
1027     http_send_response(c);
1028     release_session(c, s);
1029 }
1030
1031 static void show_records_ready(void *data)
1032 {
1033     struct http_channel *c = (struct http_channel *) data;
1034
1035     show_records(c, -1);
1036 }
1037
1038 static void cmd_show(struct http_channel *c)
1039 {
1040     struct http_request *rq = c->request;
1041     struct http_session *s = locate_session(c);
1042     const char *block = http_argbyname(rq, "block");
1043     int status;
1044
1045     if (!s)
1046         return;
1047
1048     status = session_active_clients(s->psession);
1049
1050     if (block)
1051     {
1052         if (!strcmp(block, "preferred") && !session_is_preferred_clients_ready(s->psession) && reclist_get_num_records(s->psession->reclist) == 0) {
1053             // if there is already a watch/block. we do not block this one
1054             if (session_set_watch(s->psession, SESSION_WATCH_SHOW_PREF,
1055                                   show_records_ready, c, c) != 0)
1056             {
1057                 yaz_log(c->http_sessions->log_level,
1058                         "%p Session %u: Blocking on cmd_show. Waiting for preferred targets", s, s->session_id);
1059             }
1060             release_session(c,s);
1061             return;
1062
1063         }
1064         else if (status && reclist_get_num_records(s->psession->reclist) == 0)
1065         {
1066             // if there is already a watch/block. we do not block this one
1067             if (session_set_watch(s->psession, SESSION_WATCH_SHOW,
1068                                   show_records_ready, c, c) != 0)
1069             {
1070                 yaz_log(c->http_sessions->log_level, "%p Session %u: Blocking on cmd_show", s, s->session_id);
1071             }
1072             release_session(c,s);
1073             return;
1074         }
1075     }
1076     show_records(c, status);
1077     release_session(c,s);
1078 }
1079
1080 static void cmd_ping(struct http_channel *c)
1081 {
1082     struct http_response *rs = c->response;
1083     struct http_session *s = locate_session(c);
1084     if (!s)
1085         return;
1086     rs->payload = HTTP_COMMAND_RESPONSE_PREFIX "<ping><status>OK</status></ping>";
1087     http_send_response(c);
1088     release_session(c, s);
1089 }
1090
1091 static int utf_8_valid(const char *str)
1092 {
1093     yaz_iconv_t cd = yaz_iconv_open("utf-8", "utf-8");
1094     if (cd)
1095     {
1096         /* check that query is UTF-8 encoded */
1097         char *inbuf = (char *) str; /* we know iconv does not alter this */
1098         size_t inbytesleft = strlen(inbuf);
1099
1100         size_t outbytesleft = strlen(inbuf) + 10;
1101         char *out = xmalloc(outbytesleft);
1102         char *outbuf = out;
1103         size_t r = yaz_iconv(cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
1104
1105         /* if OK, try flushing the rest  */
1106         if (r != (size_t) (-1))
1107             r = yaz_iconv(cd, 0, 0, &outbuf, &outbytesleft);
1108         yaz_iconv_close(cd);
1109         xfree(out);
1110         if (r == (size_t) (-1))
1111             return 0;
1112     }
1113     return 1;
1114 }
1115
1116 static void cmd_search(struct http_channel *c)
1117 {
1118     struct http_request *rq = c->request;
1119     struct http_response *rs = c->response;
1120     struct http_session *s = locate_session(c);
1121     const char *query = http_argbyname(rq, "query");
1122     const char *filter = http_argbyname(rq, "filter");
1123     const char *maxrecs = http_argbyname(rq, "maxrecs");
1124     const char *startrecs = http_argbyname(rq, "startrecs");
1125     enum pazpar2_error_code code;
1126     const char *addinfo = 0;
1127
1128     if (!s)
1129         return;
1130     if (!query)
1131     {
1132         error(rs, PAZPAR2_MISSING_PARAMETER, "query");
1133         release_session(c,s);
1134         return;
1135     }
1136     if (!utf_8_valid(query))
1137     {
1138         error(rs, PAZPAR2_MALFORMED_PARAMETER_ENCODING, "query");
1139         release_session(c,s);
1140         return;
1141     }
1142     code = search(s->psession, query, startrecs, maxrecs, filter, &addinfo);
1143     if (code)
1144     {
1145         error(rs, code, addinfo);
1146         release_session(c,s);
1147         return;
1148     }
1149     rs->payload = HTTP_COMMAND_RESPONSE_PREFIX "<search><status>OK</status></search>";
1150     http_send_response(c);
1151     release_session(c,s);
1152 }
1153
1154
1155 static void cmd_stat(struct http_channel *c)
1156 {
1157     struct http_response *rs = c->response;
1158     struct http_session *s = locate_session(c);
1159     struct statistics stat;
1160     int clients;
1161
1162     float progress = 0;
1163
1164     if (!s)
1165         return;
1166
1167     clients = session_active_clients(s->psession);
1168     statistics(s->psession, &stat);
1169
1170     if (stat.num_clients > 0) {
1171         progress = (stat.num_clients  - clients) / (float)stat.num_clients;
1172     }
1173
1174     wrbuf_rewind(c->wrbuf);
1175     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<stat>");
1176     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", clients);
1177     wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", stat.num_hits);
1178     wrbuf_printf(c->wrbuf, "<records>%d</records>\n", stat.num_records);
1179     wrbuf_printf(c->wrbuf, "<clients>%d</clients>\n", stat.num_clients);
1180     wrbuf_printf(c->wrbuf, "<unconnected>%d</unconnected>\n", stat.num_no_connection);
1181     wrbuf_printf(c->wrbuf, "<connecting>%d</connecting>\n", stat.num_connecting);
1182     wrbuf_printf(c->wrbuf, "<working>%d</working>\n", stat.num_working);
1183     wrbuf_printf(c->wrbuf, "<idle>%d</idle>\n", stat.num_idle);
1184     wrbuf_printf(c->wrbuf, "<failed>%d</failed>\n", stat.num_failed);
1185     wrbuf_printf(c->wrbuf, "<error>%d</error>\n", stat.num_error);
1186     wrbuf_printf(c->wrbuf, "<progress>%.2f</progress>\n", progress);
1187     wrbuf_puts(c->wrbuf, "</stat>");
1188     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
1189     http_send_response(c);
1190     release_session(c,s);
1191 }
1192
1193 static void cmd_info(struct http_channel *c)
1194 {
1195     char yaz_version_str[20];
1196     struct http_response *rs = c->response;
1197
1198     wrbuf_rewind(c->wrbuf);
1199     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<info>\n");
1200     wrbuf_puts(c->wrbuf, " <version>\n");
1201     wrbuf_puts(c->wrbuf, "  <pazpar2");
1202 #ifdef PAZPAR2_VERSION_SHA1
1203     wrbuf_printf(c->wrbuf, " sha1=\"%s\"", PAZPAR2_VERSION_SHA1);
1204 #endif
1205     wrbuf_puts(c->wrbuf, ">");
1206     wrbuf_xmlputs(c->wrbuf, VERSION);
1207     wrbuf_puts(c->wrbuf, "</pazpar2>");
1208
1209
1210     yaz_version(yaz_version_str, 0);
1211     wrbuf_puts(c->wrbuf, "  <yaz compiled=\"");
1212     wrbuf_xmlputs(c->wrbuf, YAZ_VERSION);
1213     wrbuf_puts(c->wrbuf, "\">");
1214     wrbuf_xmlputs(c->wrbuf, yaz_version_str);
1215     wrbuf_puts(c->wrbuf, "</yaz>\n");
1216
1217     wrbuf_puts(c->wrbuf, " </version>\n");
1218
1219     info_services(c->server, c->wrbuf);
1220
1221     wrbuf_puts(c->wrbuf, "</info>");
1222     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
1223     http_send_response(c);
1224 }
1225
1226 struct {
1227     char *name;
1228     void (*fun)(struct http_channel *c);
1229 } commands[] = {
1230     { "init", cmd_init },
1231     { "settings", cmd_settings },
1232     { "stat", cmd_stat },
1233     { "bytarget", cmd_bytarget },
1234     { "show", cmd_show },
1235     { "search", cmd_search },
1236     { "termlist", cmd_termlist },
1237     { "exit", cmd_exit },
1238     { "session-status", cmd_session_status },
1239     { "server-status", cmd_server_status },
1240     { "ping", cmd_ping },
1241     { "record", cmd_record },
1242     { "info", cmd_info },
1243     {0,0}
1244 };
1245
1246 void http_command(struct http_channel *c)
1247 {
1248     const char *command = http_argbyname(c->request, "command");
1249     struct http_response *rs = http_create_response(c);
1250     int i;
1251
1252     c->response = rs;
1253
1254     http_addheader(rs, "Expires", "Thu, 19 Nov 1981 08:52:00 GMT");
1255     http_addheader(rs, "Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
1256
1257     if (!command)
1258     {
1259         error(rs, PAZPAR2_MISSING_PARAMETER, "command");
1260         return;
1261     }
1262     for (i = 0; commands[i].name; i++)
1263         if (!strcmp(commands[i].name, command))
1264         {
1265             (*commands[i].fun)(c);
1266             break;
1267         }
1268     if (!commands[i].name)
1269         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "command");
1270
1271     return;
1272 }
1273
1274 /*
1275  * Local variables:
1276  * c-basic-offset: 4
1277  * c-file-style: "Stroustrup"
1278  * indent-tabs-mode: nil
1279  * End:
1280  * vim: shiftwidth=4 tabstop=8 expandtab
1281  */
1282