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 #ifdef __LINUX__
  45 #include <malloc.h>
  46 void print_meminfo(WRBUF wrbuf) {
  47     struct mallinfo minfo;
  48     minfo = mallinfo();
  49     wrbuf_printf(wrbuf, "  <memory>\n"
  50                         "   <arena>%d</arena>\n"
  51                         "   <uordblks>%d</uordblks>\n"
  52                         "   <fordblks>%d</fordblks>\n"
  53                         "   <ordblks>%d</ordblks>\n"
  54                         "   <keepcost>%d</keepcost>\n"
  55                         "   <hblks>%d</hblks>\n"
  56                         "   <hblkhd>%d</hblkhd>\n"
  57                         "   <virt>%d</virt>\n"
  58                         "   <virtuse>%d</virtuse>\n"
  59                         "  </memory>\n",
  60                  minfo.arena, minfo.uordblks, minfo.fordblks,minfo.ordblks, minfo.keepcost, minfo.hblks, minfo.hblkhd, minfo.arena + minfo.hblkhd, minfo.uordblks + minfo.hblkhd);
  61
  62 }
  63 #else
  64 #define print_meminfo(x)
  65 #endif
  66
  67
  68 // Update this when the protocol changes
  69 #define PAZPAR2_PROTOCOL_VERSION "1"
  70
  71 #define HTTP_COMMAND_RESPONSE_PREFIX "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
  72
  73 struct http_session {
  74     IOCHAN timeout_iochan;     // NOTE: This is NOT associated with a socket
  75     struct session *psession;
  76     unsigned int session_id;
  77     int timestamp;
  78     int destroy_counter;
  79     int activity_counter;
  80     NMEM nmem;
  81     http_sessions_t http_sessions;
  82     struct http_session *next;
  83 };
  84
  85 struct http_sessions {
  86     struct http_session *session_list;
  87     YAZ_MUTEX mutex;
  88     int log_level;
  89 };
  90
  91 static YAZ_MUTEX g_http_session_mutex = 0;
  92 static int g_http_sessions = 0;
  93
  94 int http_session_use(int delta)
  95 {
  96     int sessions;
  97     if (!g_http_session_mutex)
  98         yaz_mutex_create(&g_http_session_mutex);
  99     yaz_mutex_enter(g_http_session_mutex);
 100     g_http_sessions += delta;
 101     sessions = g_http_sessions;
 102     yaz_mutex_leave(g_http_session_mutex);
 103     yaz_log(YLOG_DEBUG, "%s sesions=%d", delta == 0 ? "" : (delta > 0 ? "INC" : "DEC"), sessions);
 104     return sessions;
 105
 106 }
 107
 108 http_sessions_t http_sessions_create(void)
 109 {
 110     http_sessions_t hs = xmalloc(sizeof(*hs));
 111     hs->session_list = 0;
 112     hs->mutex = 0;
 113     pazpar2_mutex_create(&hs->mutex, "http_sessions");
 114     hs->log_level = yaz_log_module_level("HTTP");
 115     return hs;
 116 }
 117
 118 void http_sessions_destroy(http_sessions_t hs)
 119 {
 120     if (hs)
 121     {
 122         struct http_session *s = hs->session_list;
 123         while (s)
 124         {
 125             struct http_session *s_next = s->next;
 126             iochan_destroy(s->timeout_iochan);
 127             destroy_session(s->psession);
 128             nmem_destroy(s->nmem);
 129             s = s_next;
 130         }
 131         yaz_mutex_destroy(&hs->mutex);
 132         xfree(hs);
 133     }
 134 }
 135
 136 void http_session_destroy(struct http_session *s);
 137
 138 static void session_timeout(IOCHAN i, int event)
 139 {
 140     struct http_session *s = iochan_getdata(i);
 141     http_session_destroy(s);
 142 }
 143
 144 struct http_session *http_session_create(struct conf_service *service,
 145                                          http_sessions_t http_sessions,
 146                                          unsigned int sesid)
 147 {
 148     NMEM nmem = nmem_create();
 149     struct http_session *r = nmem_malloc(nmem, sizeof(*r));
 150     char tmp_str[50];
 151
 152     sprintf(tmp_str, "session#%u", sesid);
 153     r->psession = new_session(nmem, service, sesid);
 154     r->session_id = sesid;
 155     r->timestamp = 0;
 156     r->nmem = nmem;
 157     r->destroy_counter = r->activity_counter = 0;
 158     r->http_sessions = http_sessions;
 159
 160     yaz_mutex_enter(http_sessions->mutex);
 161     r->next = http_sessions->session_list;
 162     http_sessions->session_list = r;
 163     yaz_mutex_leave(http_sessions->mutex);
 164
 165     r->timeout_iochan = iochan_create(-1, session_timeout, 0, "http_session_timeout");
 166     iochan_setdata(r->timeout_iochan, r);
 167     yaz_log(http_sessions->log_level, "%p Session %u created. timeout chan=%p timeout=%d", r, sesid, r->timeout_iochan, service->session_timeout);
 168     iochan_settimeout(r->timeout_iochan, service->session_timeout);
 169
 170     iochan_add(service->server->iochan_man, r->timeout_iochan);
 171     http_session_use(1);
 172     return r;
 173 }
 174
 175 void http_session_destroy(struct http_session *s)
 176 {
 177     int must_destroy = 0;
 178
 179     http_sessions_t http_sessions = s->http_sessions;
 180
 181     yaz_log(http_sessions->log_level, "%p HTTP Session %u destroyed", s, s->session_id);
 182     yaz_mutex_enter(http_sessions->mutex);
 183     /* only if http_session has no active http sessions on it can be destroyed */
 184     if (s->destroy_counter == s->activity_counter) {
 185         struct http_session **p = 0;
 186         must_destroy = 1;
 187         for (p = &http_sessions->session_list; *p; p = &(*p)->next)
 188             if (*p == s)
 189             {
 190                 *p = (*p)->next;
 191                 break;
 192             }
 193     }
 194     yaz_mutex_leave(http_sessions->mutex);
 195     if (must_destroy)
 196     {   /* destroying for real */
 197         yaz_log(http_sessions->log_level, "%p HTTP Session %u destroyed", s, s->session_id);
 198         iochan_destroy(s->timeout_iochan);
 199         destroy_session(s->psession);
 200         http_session_use(-1);
 201         nmem_destroy(s->nmem);
 202     }
 203     else {
 204         yaz_log(http_sessions->log_level, "%p HTTP Session %u destroyed delayed. Active clients (%d-%d). Waiting for new timeout.",
 205                 s, s->session_id, s->activity_counter, s->destroy_counter);
 206     }
 207
 208 }
 209
 210 static const char *get_msg(enum pazpar2_error_code code)
 211 {
 212     struct pazpar2_error_msg {
 213         enum pazpar2_error_code code;
 214         const char *msg;
 215     };
 216     static const struct pazpar2_error_msg ar[] = {
 217         { PAZPAR2_NO_SESSION, "Session does not exist or it has expired"},
 218         { PAZPAR2_MISSING_PARAMETER, "Missing parameter"},
 219         { PAZPAR2_MALFORMED_PARAMETER_VALUE, "Malformed parameter value"},
 220         { PAZPAR2_MALFORMED_PARAMETER_ENCODING, "Malformed parameter encoding"},
 221         { PAZPAR2_MALFORMED_SETTING, "Malformed setting argument"},
 222         { PAZPAR2_HITCOUNTS_FAILED, "Failed to retrieve hitcounts"},
 223         { PAZPAR2_RECORD_MISSING, "Record missing"},
 224         { PAZPAR2_NO_TARGETS, "No targets"},
 225         { PAZPAR2_CONFIG_TARGET, "Target cannot be configured"},
 226         { PAZPAR2_RECORD_FAIL, "Record command failed"},
 227         { PAZPAR2_NOT_IMPLEMENTED, "Not implemented"},
 228         { PAZPAR2_NO_SERVICE, "No service"},
 229         { PAZPAR2_LAST_ERROR, "Last error"},
 230         { 0, 0 }
 231     };
 232     int i = 0;
 233     while (ar[i].msg)
 234     {
 235         if (code == ar[i].code)
 236             return ar[i].msg;
 237         i++;
 238     }
 239     return "No error";
 240 }
 241
 242 static void error(struct http_response *rs,
 243                   enum pazpar2_error_code code,
 244                   const char *addinfo)
 245 {
 246     struct http_channel *c = rs->channel;
 247     WRBUF text = wrbuf_alloc();
 248     const char *http_status = "417";
 249     const char *msg = get_msg(code);
 250
 251     rs->msg = nmem_strdup(c->nmem, msg);
 252     strcpy(rs->code, http_status);
 253
 254     wrbuf_printf(text, HTTP_COMMAND_RESPONSE_PREFIX "<error code=\"%d\" msg=\"%s\">", (int) code,
 255                msg);
 256     if (addinfo)
 257         wrbuf_xmlputs(text, addinfo);
 258     wrbuf_puts(text, "</error>");
 259
 260     yaz_log(YLOG_WARN, "HTTP %s %s%s%s", http_status,
 261             msg, addinfo ? ": " : "" , addinfo ? addinfo : "");
 262     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(text));
 263     wrbuf_destroy(text);
 264     http_send_response(c);
 265 }
 266
 267 unsigned int make_sessionid(void)
 268 {
 269     static int seq = 0; /* thread pr */
 270     unsigned int res;
 271
 272     seq++;
 273     if (global_parameters.predictable_sessions)
 274         res = seq;
 275     else
 276     {
 277 #ifdef WIN32
 278         res = seq;
 279 #else
 280         struct timeval t;
 281
 282         if (gettimeofday(&t, 0) < 0)
 283         {
 284             yaz_log(YLOG_WARN|YLOG_ERRNO, "gettimeofday");
 285             exit(1);
 286         }
 287         /* at most 256 sessions per second ..
 288            (long long would be more appropriate)*/
 289         res = t.tv_sec;
 290         res = ((res << 8) | (seq & 0xff)) & ((1U << 31) - 1);
 291 #endif
 292     }
 293     return res;
 294 }
 295
 296 static struct http_session *locate_session(struct http_channel *c)
 297 {
 298     struct http_response *rs = c->response;
 299     struct http_request *rq = c->request;
 300     struct http_session *p;
 301     const char *session = http_argbyname(rq, "session");
 302     http_sessions_t http_sessions = c->http_sessions;
 303     unsigned int id;
 304
 305     if (!session)
 306     {
 307         error(rs, PAZPAR2_MISSING_PARAMETER, "session");
 308         return 0;
 309     }
 310     id = atoi(session);
 311     yaz_mutex_enter(http_sessions->mutex);
 312     for (p = http_sessions->session_list; p; p = p->next)
 313         if (id == p->session_id)
 314             break;
 315     if (p)
 316         p->activity_counter++;
 317     yaz_mutex_leave(http_sessions->mutex);
 318     if (p)
 319         iochan_activity(p->timeout_iochan);
 320     else
 321         error(rs, PAZPAR2_NO_SESSION, session);
 322     return p;
 323 }
 324
 325 // Call after use of locate_session, in order to increment the destroy_counter
 326 static void release_session(struct http_channel *c, struct http_session *session) {
 327     http_sessions_t http_sessions = c->http_sessions;
 328     yaz_mutex_enter(http_sessions->mutex);
 329     if (session)
 330         session->destroy_counter++;
 331     yaz_mutex_leave(http_sessions->mutex);
 332 }
 333
 334 // Decode settings parameters and apply to session
 335 // Syntax: setting[target]=value
 336 static int process_settings(struct session *se, struct http_request *rq,
 337                             struct http_response *rs)
 338 {
 339     struct http_argument *a;
 340
 341     for (a = rq->arguments; a; a = a->next)
 342         if (strchr(a->name, '['))
 343         {
 344             char **res;
 345             int num;
 346             char *dbname;
 347             char *setting;
 348
 349             // Nmem_strsplit *rules*!!!
 350             nmem_strsplit(se->session_nmem, "[]", a->name, &res, &num);
 351             if (num != 2)
 352             {
 353                 error(rs, PAZPAR2_MALFORMED_SETTING, a->name);
 354                 return -1;
 355             }
 356             setting = res[0];
 357             dbname = res[1];
 358             session_apply_setting(se, dbname, setting,
 359                     nmem_strdup(se->session_nmem, a->value));
 360         }
 361     return 0;
 362 }
 363
 364 static void cmd_exit(struct http_channel *c)
 365 {
 366     char buf[1024];
 367     struct http_response *rs = c->response;
 368     yaz_log(YLOG_WARN, "exit");
 369     sprintf(buf, HTTP_COMMAND_RESPONSE_PREFIX "<exit><status>OK</status></exit>");
 370     rs->payload = nmem_strdup(c->nmem, buf);
 371     http_send_response(c);
 372     http_close_server(c->server);
 373 }
 374
 375 static void cmd_init(struct http_channel *c)
 376 {
 377     char buf[1024];
 378     struct http_request *r = c->request;
 379     const char *clear = http_argbyname(r, "clear");
 380     const char *content_type = http_lookup_header(r->headers, "Content-Type");
 381     unsigned int sesid;
 382     struct http_session *s;
 383     struct http_response *rs = c->response;
 384     struct conf_service *service = 0; /* no service (yet) */
 385
 386     if (r->content_len && content_type &&
 387         !yaz_strcmp_del("text/xml", content_type, "; "))
 388     {
 389         xmlDoc *doc = xmlParseMemory(r->content_buf, r->content_len);
 390         xmlNode *root_n;
 391         if (!doc)
 392         {
 393             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 394             return;
 395         }
 396         root_n = xmlDocGetRootElement(doc);
 397         service = service_create(c->server, root_n);
 398         xmlFreeDoc(doc);
 399         if (!service)
 400         {
 401             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 402             return;
 403         }
 404     }
 405
 406     if (!service)
 407     {
 408         const char *service_name = http_argbyname(c->request, "service");
 409         service = locate_service(c->server, service_name);
 410         if (!service)
 411         {
 412             error(rs, PAZPAR2_NO_SERVICE, service_name ? service_name : "unnamed");
 413             return;
 414         }
 415     }
 416     sesid = make_sessionid();
 417     s = http_session_create(service, c->http_sessions, sesid);
 418
 419     yaz_log(c->http_sessions->log_level, "%p Session init %u ", s, sesid);
 420     if (!clear || *clear == '0')
 421         session_init_databases(s->psession);
 422     else
 423         yaz_log(YLOG_LOG, "HTTP Session %u init: No databases preloaded", sesid);
 424
 425     if (process_settings(s->psession, c->request, c->response) < 0)
 426         return;
 427
 428     sprintf(buf, HTTP_COMMAND_RESPONSE_PREFIX
 429             "<init><status>OK</status><session>%d", sesid);
 430     if (c->server->server_id)
 431     {
 432         strcat(buf, ".");
 433         strcat(buf, c->server->server_id);
 434     }
 435     strcat(buf, "</session>"
 436            "<protocol>" PAZPAR2_PROTOCOL_VERSION "</protocol></init>");
 437     rs->payload = nmem_strdup(c->nmem, buf);
 438     http_send_response(c);
 439 }
 440
 441 static void apply_local_setting(void *client_data,
 442                                 struct setting *set)
 443 {
 444     struct session *se =  (struct session *) client_data;
 445
 446     session_apply_setting(se, nmem_strdup(se->session_nmem, set->target),
 447                           nmem_strdup(se->session_nmem, set->name),
 448                           nmem_strdup(se->session_nmem, set->value));
 449 }
 450
 451 static void cmd_settings(struct http_channel *c)
 452 {
 453     struct http_response *rs = c->response;
 454     struct http_request *rq = c->request;
 455     struct http_session *s = locate_session(c);
 456     const char *content_type = http_lookup_header(rq->headers, "Content-Type");
 457
 458     if (!s)
 459         return;
 460
 461     if (rq->content_len && content_type &&
 462         !yaz_strcmp_del("text/xml", content_type, "; "))
 463     {
 464         xmlDoc *doc = xmlParseMemory(rq->content_buf, rq->content_len);
 465         xmlNode *root_n;
 466         if (!doc)
 467         {
 468             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 469             return;
 470         }
 471         root_n = xmlDocGetRootElement(doc);
 472
 473         settings_read_node_x(root_n, s->psession, apply_local_setting);
 474
 475         xmlFreeDoc(doc);
 476     }
 477     if (process_settings(s->psession, rq, rs) < 0) {
 478         release_session(c,s);
 479         return;
 480     }
 481     rs->payload = HTTP_COMMAND_RESPONSE_PREFIX "<settings><status>OK</status></settings>";
 482     http_send_response(c);
 483     release_session(c,s);
 484 }
 485
 486 // Compares two hitsbytarget nodes by hitcount
 487 static int cmp_ht(const void *p1, const void *p2)
 488 {
 489     const struct hitsbytarget *h1 = p1;
 490     const struct hitsbytarget *h2 = p2;
 491     return h2->hits - h1->hits;
 492 }
 493
 494 // This implements functionality somewhat similar to 'bytarget', but in a termlist form
 495 static int targets_termlist(WRBUF wrbuf, struct session *se, int num,
 496                              NMEM nmem)
 497 {
 498     struct hitsbytarget *ht;
 499     int count, i;
 500
 501     ht = hitsbytarget(se, &count, nmem);
 502     qsort(ht, count, sizeof(struct hitsbytarget), cmp_ht);
 503     for (i = 0; i < count && i < num && ht[i].hits > 0; i++)
 504     {
 505
 506         // do only print terms which have display names
 507
 508         wrbuf_puts(wrbuf, "<term>\n");
 509
 510         wrbuf_puts(wrbuf, "<id>");
 511         wrbuf_xmlputs(wrbuf, ht[i].id);
 512         wrbuf_puts(wrbuf, "</id>\n");
 513
 514         wrbuf_puts(wrbuf, "<name>");
 515         if (!ht[i].name || !ht[i].name[0])
 516             wrbuf_xmlputs(wrbuf, "NO TARGET NAME");
 517         else
 518             wrbuf_xmlputs(wrbuf, ht[i].name);
 519         wrbuf_puts(wrbuf, "</name>\n");
 520
 521         wrbuf_printf(wrbuf, "<frequency>" ODR_INT_PRINTF "</frequency>\n",
 522                      ht[i].hits);
 523
 524         wrbuf_puts(wrbuf, "<state>");
 525         wrbuf_xmlputs(wrbuf, ht[i].state);
 526         wrbuf_puts(wrbuf, "</state>\n");
 527
 528         wrbuf_printf(wrbuf, "<diagnostic>%d</diagnostic>\n",
 529                      ht[i].diagnostic);
 530         wrbuf_puts(wrbuf, "</term>\n");
 531     }
 532     return count;
 533 }
 534
 535 static void cmd_termlist(struct http_channel *c)
 536 {
 537     struct http_response *rs = c->response;
 538     struct http_request *rq = c->request;
 539     struct http_session *s = locate_session(c);
 540     struct termlist_score **p;
 541     int len;
 542     int i;
 543     const char *name = http_argbyname(rq, "name");
 544     const char *nums = http_argbyname(rq, "num");
 545     int num = 15;
 546     int status;
 547     WRBUF debug_log = wrbuf_alloc();
 548
 549     if (!s)
 550         return;
 551
 552     status = session_active_clients(s->psession);
 553
 554     if (!name)
 555         name = "subject";
 556     if (strlen(name) > 255)
 557         return;
 558     if (nums)
 559         num = atoi(nums);
 560
 561     wrbuf_rewind(c->wrbuf);
 562
 563     wrbuf_puts(c->wrbuf, "<termlist>\n");
 564     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", status);
 565     while (*name)
 566     {
 567         char tname[256];
 568         const char *tp;
 569
 570         if (!(tp = strchr(name, ',')))
 571             tp = name + strlen(name);
 572         strncpy(tname, name, tp - name);
 573         tname[tp - name] = '\0';
 574         wrbuf_puts(c->wrbuf, "<list name=\"");
 575         wrbuf_xmlputs(c->wrbuf, tname);
 576         wrbuf_puts(c->wrbuf, "\">\n");
 577         if (!strcmp(tname, "xtargets")) {
 578             int targets = targets_termlist(c->wrbuf, s->psession, num, c->nmem);
 579             wrbuf_printf(debug_log, " xtargets: %d", targets);
 580         }
 581         else
 582         {
 583             p = termlist(s->psession, tname, &len);
 584             if (p && len)
 585                 wrbuf_printf(debug_log, " %s: %d", tname, len);
 586             if (p) {
 587                 for (i = 0; i < len && i < num; i++){
 588                     // prevnt sending empty term elements
 589                     if (!p[i]->term || !p[i]->term[0])
 590                         continue;
 591
 592                     wrbuf_puts(c->wrbuf, "<term>");
 593                     wrbuf_puts(c->wrbuf, "<name>");
 594                     wrbuf_xmlputs(c->wrbuf, p[i]->term);
 595                     wrbuf_puts(c->wrbuf, "</name>");
 596
 597                     wrbuf_printf(c->wrbuf,
 598                                  "<frequency>%d</frequency>",
 599                                  p[i]->frequency);
 600                     wrbuf_puts(c->wrbuf, "</term>\n");
 601                }
 602             }
 603         }
 604         wrbuf_puts(c->wrbuf, "</list>\n");
 605         name = tp;
 606         if (*name == ',')
 607             name++;
 608     }
 609     wrbuf_puts(c->wrbuf, "</termlist>\n");
 610     yaz_log(YLOG_DEBUG, "termlist response: %s ", wrbuf_cstr(debug_log));
 611     wrbuf_destroy(debug_log);
 612     rs->payload = nmem_strdup(rq->channel->nmem, wrbuf_cstr(c->wrbuf));
 613     http_send_response(c);
 614     release_session(c,s);
 615 }
 616
 617 size_t session_get_memory_status(struct session *session);
 618
 619 static void session_status(struct http_channel *c, struct http_session *s)
 620 {
 621     size_t session_nmem;
 622     wrbuf_printf(c->wrbuf, "<http_count>%u</http_count>\n", s->activity_counter);
 623     wrbuf_printf(c->wrbuf, "<http_nmem>%zu</http_nmem>\n", nmem_total(s->nmem) );
 624     session_nmem = session_get_memory_status(s->psession);
 625     wrbuf_printf(c->wrbuf, "<session_nmem>%zu</session_nmem>\n", session_nmem);
 626 }
 627
 628 static void cmd_session_status(struct http_channel *c) {
 629     struct http_response *rs = c->response;
 630     struct http_session *s = locate_session(c);
 631     if (!s)
 632         return;
 633
 634     wrbuf_rewind(c->wrbuf);
 635     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<sessionstatus><status>OK</status>\n");
 636     session_status(c, s);
 637     wrbuf_puts(c->wrbuf, "</sessionstatus>\n");
 638     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 639     http_send_response(c);
 640     release_session(c,s);
 641
 642 }
 643
 644 int sessions_count(void);
 645 int clients_count(void);
 646 #ifdef HAVE_RESULTSETS_COUNT
 647 int resultsets_count(void);
 648 #else
 649 #define resultsets_count()      0
 650 #endif
 651
 652 static void cmd_server_status(struct http_channel *c)
 653 {
 654     struct http_response *rs = c->response;
 655     int sessions   = sessions_count();
 656     int clients    = clients_count();
 657     int resultsets = resultsets_count();
 658     wrbuf_rewind(c->wrbuf);
 659     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<server-status>\n");
 660     wrbuf_printf(c->wrbuf, "  <sessions>%u</sessions>\n", sessions);
 661     wrbuf_printf(c->wrbuf, "  <clients>%u</clients>\n",   clients);
 662     /* Only works if yaz has been compiled with enabling of this */
 663     wrbuf_printf(c->wrbuf, "  <resultsets>%u</resultsets>\n",resultsets);
 664     print_meminfo(c->wrbuf);
 665
 666 /* TODO add all sessions status                         */
 667 /*    http_sessions_t http_sessions = c->http_sessions; */
 668 /*    struct http_session *p;                           */
 669 /*
 670     yaz_mutex_enter(http_sessions->mutex);
 671     for (p = http_sessions->session_list; p; p = p->next) {
 672         p->activity_counter++;
 673         wrbuf_puts(c->wrbuf, "<session-status>\n");
 674         wrbuf_printf(c->wrbuf, "<id>%s</id>\n", p->session_id);
 675         yaz_mutex_leave(http_sessions->mutex);
 676         session_status(c, p);
 677         wrbuf_puts(c->wrbuf, "</session-status>\n");
 678         yaz_mutex_enter(http_sessions->mutex);
 679         p->activity_counter--;
 680     }
 681     yaz_mutex_leave(http_sessions->mutex);
 682 */
 683     wrbuf_puts(c->wrbuf, "</server-status>\n");
 684     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 685     http_send_response(c);
 686     xmalloc_trav(0);
 687 }
 688
 689
 690 static void cmd_bytarget(struct http_channel *c)
 691 {
 692     struct http_response *rs = c->response;
 693     struct http_request *rq = c->request;
 694     struct http_session *s = locate_session(c);
 695     struct hitsbytarget *ht;
 696     const char *settings = http_argbyname(rq, "settings");
 697     int count, i;
 698
 699     if (!s)
 700         return;
 701     ht = hitsbytarget(s->psession, &count, c->nmem);
 702     wrbuf_rewind(c->wrbuf);
 703     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<bytarget><status>OK</status>");
 704
 705     for (i = 0; i < count; i++)
 706     {
 707         wrbuf_puts(c->wrbuf, "\n<target>");
 708
 709         wrbuf_puts(c->wrbuf, "<id>");
 710         wrbuf_xmlputs(c->wrbuf, ht[i].id);
 711         wrbuf_puts(c->wrbuf, "</id>\n");
 712
 713         if (ht[i].name && ht[i].name[0])
 714         {
 715             wrbuf_puts(c->wrbuf, "<name>");
 716             wrbuf_xmlputs(c->wrbuf, ht[i].name);
 717             wrbuf_puts(c->wrbuf, "</name>\n");
 718         }
 719
 720         wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", ht[i].hits);
 721         wrbuf_printf(c->wrbuf, "<diagnostic>%d</diagnostic>\n", ht[i].diagnostic);
 722         wrbuf_printf(c->wrbuf, "<records>%d</records>\n", ht[i].records);
 723
 724         wrbuf_puts(c->wrbuf, "<state>");
 725         wrbuf_xmlputs(c->wrbuf, ht[i].state);
 726         wrbuf_puts(c->wrbuf, "</state>\n");
 727         if (settings && *settings == '1')
 728         {
 729             wrbuf_puts(c->wrbuf, "<settings>\n");
 730             wrbuf_puts(c->wrbuf, ht[i].settings_xml);
 731             wrbuf_puts(c->wrbuf, "</settings>\n");
 732         }
 733         wrbuf_puts(c->wrbuf, "</target>");
 734     }
 735
 736     wrbuf_puts(c->wrbuf, "</bytarget>");
 737     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 738     http_send_response(c);
 739     release_session(c,s);
 740 }
 741
 742 static void write_metadata(WRBUF w, struct conf_service *service,
 743         struct record_metadata **ml, int full)
 744 {
 745     int imeta;
 746
 747     for (imeta = 0; imeta < service->num_metadata; imeta++)
 748     {
 749         struct conf_metadata *cmd = &service->metadata[imeta];
 750         struct record_metadata *md;
 751         if (!cmd->brief && !full)
 752             continue;
 753         for (md = ml[imeta]; md; md = md->next)
 754         {
 755             struct record_metadata_attr *attr = md->attributes;
 756             wrbuf_printf(w, "\n<md-%s", cmd->name);
 757
 758             for (; attr; attr = attr->next)
 759             {
 760                 wrbuf_printf(w, " %s=\"", attr->name);
 761                 wrbuf_xmlputs(w, attr->value);
 762                 wrbuf_puts(w, "\"");
 763             }
 764             wrbuf_puts(w, ">");
 765             switch (cmd->type)
 766             {
 767                 case Metadata_type_generic:
 768                     wrbuf_xmlputs(w, md->data.text.disp);
 769                     break;
 770                 case Metadata_type_year:
 771                     wrbuf_printf(w, "%d", md->data.number.min);
 772                     if (md->data.number.min != md->data.number.max)
 773                         wrbuf_printf(w, "-%d", md->data.number.max);
 774                     break;
 775                 default:
 776                     wrbuf_puts(w, "[can't represent]");
 777             }
 778             wrbuf_printf(w, "</md-%s>", cmd->name);
 779         }
 780     }
 781 }
 782
 783 static void write_subrecord(struct record *r, WRBUF w,
 784         struct conf_service *service, int show_details)
 785 {
 786     const char *name = session_setting_oneval(
 787         client_get_database(r->client), PZ_NAME);
 788
 789     wrbuf_puts(w, "<location id=\"");
 790     wrbuf_xmlputs(w, client_get_database(r->client)->database->url);
 791     wrbuf_puts(w, "\" ");
 792
 793     wrbuf_puts(w, "name=\"");
 794     wrbuf_xmlputs(w,  *name ? name : "Unknown");
 795     wrbuf_puts(w, "\">");
 796
 797     write_metadata(w, service, r->metadata, show_details);
 798     wrbuf_puts(w, "</location>\n");
 799 }
 800
 801 static void show_raw_record_error(void *data, const char *addinfo)
 802 {
 803     http_channel_observer_t obs = data;
 804     struct http_channel *c = http_channel_observer_chan(obs);
 805     struct http_response *rs = c->response;
 806
 807     http_remove_observer(obs);
 808
 809     error(rs, PAZPAR2_RECORD_FAIL, addinfo);
 810 }
 811
 812 static void show_raw_record_ok(void *data, const char *buf, size_t sz)
 813 {
 814     http_channel_observer_t obs = data;
 815     struct http_channel *c = http_channel_observer_chan(obs);
 816     struct http_response *rs = c->response;
 817
 818     http_remove_observer(obs);
 819
 820     wrbuf_write(c->wrbuf, buf, sz);
 821     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 822     http_send_response(c);
 823 }
 824
 825
 826 static void show_raw_record_ok_binary(void *data, const char *buf, size_t sz)
 827 {
 828     http_channel_observer_t obs = data;
 829     struct http_channel *c = http_channel_observer_chan(obs);
 830     struct http_response *rs = c->response;
 831
 832     http_remove_observer(obs);
 833
 834     wrbuf_write(c->wrbuf, buf, sz);
 835     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 836
 837     rs->content_type = "application/octet-stream";
 838     http_send_response(c);
 839 }
 840
 841
 842 void show_raw_reset(void *data, struct http_channel *c, void *data2)
 843 {
 844     //struct client *client = data;
 845     //client_show_raw_remove(client, data2);
 846 }
 847
 848 static void cmd_record_ready(void *data);
 849
 850 static void cmd_record(struct http_channel *c)
 851 {
 852     struct http_response *rs = c->response;
 853     struct http_request *rq = c->request;
 854     struct http_session *s = locate_session(c);
 855     struct record_cluster *rec, *prev_r, *next_r;
 856     struct record *r;
 857     struct conf_service *service;
 858     const char *idstr = http_argbyname(rq, "id");
 859     const char *offsetstr = http_argbyname(rq, "offset");
 860     const char *binarystr = http_argbyname(rq, "binary");
 861
 862     if (!s)
 863         return;
 864     service = s->psession->service;
 865     if (!idstr)
 866     {
 867         error(rs, PAZPAR2_MISSING_PARAMETER, "id");
 868         return;
 869     }
 870     wrbuf_rewind(c->wrbuf);
 871     if (!(rec = show_single_start(s->psession, idstr, &prev_r, &next_r)))
 872     {
 873         if (session_active_clients(s->psession) == 0)
 874         {
 875             error(rs, PAZPAR2_RECORD_MISSING, idstr);
 876         }
 877         else if (session_set_watch(s->psession, SESSION_WATCH_RECORD,
 878                               cmd_record_ready, c, c) != 0)
 879         {
 880             error(rs, PAZPAR2_RECORD_MISSING, idstr);
 881         }
 882         release_session(c, s);
 883         return;
 884     }
 885     if (offsetstr)
 886     {
 887         int offset = atoi(offsetstr);
 888         const char *syntax = http_argbyname(rq, "syntax");
 889         const char *esn = http_argbyname(rq, "esn");
 890         int i;
 891         struct record*r = rec->records;
 892         int binary = 0;
 893
 894         if (binarystr && *binarystr != '0')
 895             binary = 1;
 896
 897         for (i = 0; i < offset && r; r = r->next, i++)
 898             ;
 899         if (!r)
 900         {
 901             error(rs, PAZPAR2_RECORD_FAIL, "no record at offset given");
 902         }
 903         else
 904         {
 905             http_channel_observer_t obs =
 906                 http_add_observer(c, r->client, show_raw_reset);
 907             int ret = client_show_raw_begin(r->client, r->position,
 908                                         syntax, esn,
 909                                         obs /* data */,
 910                                         show_raw_record_error,
 911                                         (binary ?
 912                                          show_raw_record_ok_binary :
 913                                          show_raw_record_ok),
 914                                         (binary ? 1 : 0));
 915             if (ret == -1)
 916             {
 917                 http_remove_observer(obs);
 918                 error(rs, PAZPAR2_NO_SESSION, 0);
 919             }
 920         }
 921     }
 922     else
 923     {
 924         wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<record>\n");
 925         wrbuf_puts(c->wrbuf, "<recid>");
 926         wrbuf_xmlputs(c->wrbuf, rec->recid);
 927         wrbuf_puts(c->wrbuf, "</recid>\n");
 928         if (prev_r)
 929         {
 930             wrbuf_puts(c->wrbuf, "<prevrecid>");
 931             wrbuf_xmlputs(c->wrbuf, prev_r->recid);
 932             wrbuf_puts(c->wrbuf, "</prevrecid>\n");
 933         }
 934         if (next_r)
 935         {
 936             wrbuf_puts(c->wrbuf, "<nextrecid>");
 937             wrbuf_xmlputs(c->wrbuf, next_r->recid);
 938             wrbuf_puts(c->wrbuf, "</nextrecid>\n");
 939         }
 940         wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n",
 941                      session_active_clients(s->psession));
 942         write_metadata(c->wrbuf, service, rec->metadata, 1);
 943         for (r = rec->records; r; r = r->next)
 944             write_subrecord(r, c->wrbuf, service, 1);
 945         wrbuf_puts(c->wrbuf, "</record>\n");
 946         rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 947         http_send_response(c);
 948     }
 949     show_single_stop(s->psession, rec);
 950     release_session(c, s);
 951 }
 952
 953 static void cmd_record_ready(void *data)
 954 {
 955     struct http_channel *c = (struct http_channel *) data;
 956
 957     cmd_record(c);
 958 }
 959
 960 static void show_records(struct http_channel *c, int active)
 961 {
 962     struct http_request *rq = c->request;
 963     struct http_response *rs = c->response;
 964     struct http_session *s = locate_session(c);
 965     struct record_cluster **rl;
 966     struct reclist_sortparms *sp;
 967     const char *start = http_argbyname(rq, "start");
 968     const char *num = http_argbyname(rq, "num");
 969     const char *sort = http_argbyname(rq, "sort");
 970     int startn = 0;
 971     int numn = 20;
 972     int total;
 973     Odr_int total_hits;
 974     int i;
 975
 976     if (!s)
 977         return;
 978
 979     // We haven't counted clients yet if we're called on a block release
 980     if (active < 0)
 981         active = session_active_clients(s->psession);
 982
 983     if (start)
 984         startn = atoi(start);
 985     if (num)
 986         numn = atoi(num);
 987     if (!sort)
 988         sort = "relevance";
 989     if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
 990     {
 991         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
 992         release_session(c, s);
 993         return;
 994     }
 995
 996
 997     rl = show_range_start(s->psession, sp, startn, &numn, &total, &total_hits);
 998
 999     wrbuf_rewind(c->wrbuf);
1000     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<show>\n<status>OK</status>\n");
1001     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", active);
1002     wrbuf_printf(c->wrbuf, "<merged>%d</merged>\n", total);
1003     wrbuf_printf(c->wrbuf, "<total>" ODR_INT_PRINTF "</total>\n", total_hits);
1004     wrbuf_printf(c->wrbuf, "<start>%d</start>\n", startn);
1005     wrbuf_printf(c->wrbuf, "<num>%d</num>\n", numn);
1006
1007     for (i = 0; i < numn; i++)
1008     {
1009         int ccount;
1010         struct record *p;
1011         struct record_cluster *rec = rl[i];
1012         struct conf_service *service = s->psession->service;
1013
1014         wrbuf_puts(c->wrbuf, "<hit>\n");
1015         write_metadata(c->wrbuf, service, rec->metadata, 0);
1016         for (ccount = 0, p = rl[i]->records; p;  p = p->next, ccount++)
1017             write_subrecord(p, c->wrbuf, service, 0); // subrecs w/o details
1018         if (ccount > 1)
1019             wrbuf_printf(c->wrbuf, "<count>%d</count>\n", ccount);
1020         if (strstr(sort, "relevance"))
1021             wrbuf_printf(c->wrbuf, "<relevance>%d</relevance>\n",
1022                          rec->relevance_score);
1023         wrbuf_puts(c->wrbuf, "<recid>");
1024         wrbuf_xmlputs(c->wrbuf, rec->recid);
1025         wrbuf_puts(c->wrbuf, "</recid>\n");
1026         wrbuf_puts(c->wrbuf, "</hit>\n");
1027     }
1028
1029     show_range_stop(s->psession, rl);
1030
1031     wrbuf_puts(c->wrbuf, "</show>\n");
1032     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
1033     http_send_response(c);
1034     release_session(c, s);
1035 }
1036
1037 static void show_records_ready(void *data)
1038 {
1039     struct http_channel *c = (struct http_channel *) data;
1040
1041     show_records(c, -1);
1042 }
1043
1044 static void cmd_show(struct http_channel *c)
1045 {
1046     struct http_request *rq = c->request;
1047     struct http_session *s = locate_session(c);
1048     const char *block = http_argbyname(rq, "block");
1049     int status;
1050
1051     if (!s)
1052         return;
1053
1054     status = session_active_clients(s->psession);
1055
1056     if (block)
1057     {
1058         if (!strcmp(block, "preferred") && !session_is_preferred_clients_ready(s->psession) && reclist_get_num_records(s->psession->reclist) == 0) {
1059             // if there is already a watch/block. we do not block this one
1060             if (session_set_watch(s->psession, SESSION_WATCH_SHOW_PREF,
1061                                   show_records_ready, c, c) != 0)
1062             {
1063                 yaz_log(c->http_sessions->log_level,
1064                         "%p Session %u: Blocking on cmd_show. Waiting for preferred targets", s, s->session_id);
1065             }
1066             release_session(c,s);
1067             return;
1068
1069         }
1070         else if (status && reclist_get_num_records(s->psession->reclist) == 0)
1071         {
1072             // if there is already a watch/block. we do not block this one
1073             if (session_set_watch(s->psession, SESSION_WATCH_SHOW,
1074                                   show_records_ready, c, c) != 0)
1075             {
1076                 yaz_log(c->http_sessions->log_level, "%p Session %u: Blocking on cmd_show", s, s->session_id);
1077             }
1078             release_session(c,s);
1079             return;
1080         }
1081     }
1082     show_records(c, status);
1083     release_session(c,s);
1084 }
1085
1086 static void cmd_ping(struct http_channel *c)
1087 {
1088     struct http_response *rs = c->response;
1089     struct http_session *s = locate_session(c);
1090     if (!s)
1091         return;
1092     rs->payload = HTTP_COMMAND_RESPONSE_PREFIX "<ping><status>OK</status></ping>";
1093     http_send_response(c);
1094     release_session(c, s);
1095 }
1096
1097 static int utf_8_valid(const char *str)
1098 {
1099     yaz_iconv_t cd = yaz_iconv_open("utf-8", "utf-8");
1100     if (cd)
1101     {
1102         /* check that query is UTF-8 encoded */
1103         char *inbuf = (char *) str; /* we know iconv does not alter this */
1104         size_t inbytesleft = strlen(inbuf);
1105
1106         size_t outbytesleft = strlen(inbuf) + 10;
1107         char *out = xmalloc(outbytesleft);
1108         char *outbuf = out;
1109         size_t r = yaz_iconv(cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
1110
1111         /* if OK, try flushing the rest  */
1112         if (r != (size_t) (-1))
1113             r = yaz_iconv(cd, 0, 0, &outbuf, &outbytesleft);
1114         yaz_iconv_close(cd);
1115         xfree(out);
1116         if (r == (size_t) (-1))
1117             return 0;
1118     }
1119     return 1;
1120 }
1121
1122 static void cmd_search(struct http_channel *c)
1123 {
1124     struct http_request *rq = c->request;
1125     struct http_response *rs = c->response;
1126     struct http_session *s = locate_session(c);
1127     const char *query = http_argbyname(rq, "query");
1128     const char *filter = http_argbyname(rq, "filter");
1129     const char *maxrecs = http_argbyname(rq, "maxrecs");
1130     const char *startrecs = http_argbyname(rq, "startrecs");
1131     enum pazpar2_error_code code;
1132     const char *addinfo = 0;
1133
1134     if (!s)
1135         return;
1136     if (!query)
1137     {
1138         error(rs, PAZPAR2_MISSING_PARAMETER, "query");
1139         release_session(c,s);
1140         return;
1141     }
1142     if (!utf_8_valid(query))
1143     {
1144         error(rs, PAZPAR2_MALFORMED_PARAMETER_ENCODING, "query");
1145         release_session(c,s);
1146         return;
1147     }
1148     code = search(s->psession, query, startrecs, maxrecs, filter, &addinfo);
1149     if (code)
1150     {
1151         error(rs, code, addinfo);
1152         release_session(c,s);
1153         return;
1154     }
1155     rs->payload = HTTP_COMMAND_RESPONSE_PREFIX "<search><status>OK</status></search>";
1156     http_send_response(c);
1157     release_session(c,s);
1158 }
1159
1160
1161 static void cmd_stat(struct http_channel *c)
1162 {
1163     struct http_response *rs = c->response;
1164     struct http_session *s = locate_session(c);
1165     struct statistics stat;
1166     int clients;
1167
1168     float progress = 0;
1169
1170     if (!s)
1171         return;
1172
1173     clients = session_active_clients(s->psession);
1174     statistics(s->psession, &stat);
1175
1176     if (stat.num_clients > 0) {
1177         progress = (stat.num_clients  - clients) / (float)stat.num_clients;
1178     }
1179
1180     wrbuf_rewind(c->wrbuf);
1181     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<stat>");
1182     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", clients);
1183     wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", stat.num_hits);
1184     wrbuf_printf(c->wrbuf, "<records>%d</records>\n", stat.num_records);
1185     wrbuf_printf(c->wrbuf, "<clients>%d</clients>\n", stat.num_clients);
1186     wrbuf_printf(c->wrbuf, "<unconnected>%d</unconnected>\n", stat.num_no_connection);
1187     wrbuf_printf(c->wrbuf, "<connecting>%d</connecting>\n", stat.num_connecting);
1188     wrbuf_printf(c->wrbuf, "<working>%d</working>\n", stat.num_working);
1189     wrbuf_printf(c->wrbuf, "<idle>%d</idle>\n", stat.num_idle);
1190     wrbuf_printf(c->wrbuf, "<failed>%d</failed>\n", stat.num_failed);
1191     wrbuf_printf(c->wrbuf, "<error>%d</error>\n", stat.num_error);
1192     wrbuf_printf(c->wrbuf, "<progress>%.2f</progress>\n", progress);
1193     wrbuf_puts(c->wrbuf, "</stat>");
1194     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
1195     http_send_response(c);
1196     release_session(c,s);
1197 }
1198
1199 static void cmd_info(struct http_channel *c)
1200 {
1201     char yaz_version_str[20];
1202     struct http_response *rs = c->response;
1203
1204     wrbuf_rewind(c->wrbuf);
1205     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<info>\n");
1206     wrbuf_puts(c->wrbuf, " <version>\n");
1207     wrbuf_puts(c->wrbuf, "  <pazpar2");
1208 #ifdef PAZPAR2_VERSION_SHA1
1209     wrbuf_printf(c->wrbuf, " sha1=\"%s\"", PAZPAR2_VERSION_SHA1);
1210 #endif
1211     wrbuf_puts(c->wrbuf, ">");
1212     wrbuf_xmlputs(c->wrbuf, VERSION);
1213     wrbuf_puts(c->wrbuf, "</pazpar2>");
1214
1215
1216     yaz_version(yaz_version_str, 0);
1217     wrbuf_puts(c->wrbuf, "  <yaz compiled=\"");
1218     wrbuf_xmlputs(c->wrbuf, YAZ_VERSION);
1219     wrbuf_puts(c->wrbuf, "\">");
1220     wrbuf_xmlputs(c->wrbuf, yaz_version_str);
1221     wrbuf_puts(c->wrbuf, "</yaz>\n");
1222
1223     wrbuf_puts(c->wrbuf, " </version>\n");
1224
1225     info_services(c->server, c->wrbuf);
1226
1227     wrbuf_puts(c->wrbuf, "</info>");
1228     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
1229     http_send_response(c);
1230 }
1231
1232 struct {
1233     char *name;
1234     void (*fun)(struct http_channel *c);
1235 } commands[] = {
1236     { "init", cmd_init },
1237     { "settings", cmd_settings },
1238     { "stat", cmd_stat },
1239     { "bytarget", cmd_bytarget },
1240     { "show", cmd_show },
1241     { "search", cmd_search },
1242     { "termlist", cmd_termlist },
1243     { "exit", cmd_exit },
1244     { "session-status", cmd_session_status },
1245     { "server-status", cmd_server_status },
1246     { "ping", cmd_ping },
1247     { "record", cmd_record },
1248     { "info", cmd_info },
1249     {0,0}
1250 };
1251
1252 void http_command(struct http_channel *c)
1253 {
1254     const char *command = http_argbyname(c->request, "command");
1255     struct http_response *rs = http_create_response(c);
1256     int i;
1257
1258     c->response = rs;
1259
1260     http_addheader(rs, "Expires", "Thu, 19 Nov 1981 08:52:00 GMT");
1261     http_addheader(rs, "Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
1262
1263     if (!command)
1264     {
1265         error(rs, PAZPAR2_MISSING_PARAMETER, "command");
1266         return;
1267     }
1268     for (i = 0; commands[i].name; i++)
1269         if (!strcmp(commands[i].name, command))
1270         {
1271             (*commands[i].fun)(c);
1272             break;
1273         }
1274     if (!commands[i].name)
1275         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "command");
1276
1277     return;
1278 }
1279
1280 /*
1281  * Local variables:
1282  * c-basic-offset: 4
1283  * c-file-style: "Stroustrup"
1284  * indent-tabs-mode: nil
1285  * End:
1286  * vim: shiftwidth=4 tabstop=8 expandtab
1287  */
1288