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     char buf[1024];
 366     struct http_response *rs = c->response;
 367     yaz_log(YLOG_WARN, "exit");
 368     sprintf(buf, HTTP_COMMAND_RESPONSE_PREFIX "<exit><status>OK</status></exit>");
 369     rs->payload = nmem_strdup(c->nmem, buf);
 370     http_send_response(c);
 371     http_close_server(c->server);
 372 }
 373
 374 static void cmd_init(struct http_channel *c)
 375 {
 376     char buf[1024];
 377     struct http_request *r = c->request;
 378     const char *clear = http_argbyname(r, "clear");
 379     const char *content_type = http_lookup_header(r->headers, "Content-Type");
 380     unsigned int sesid;
 381     struct http_session *s;
 382     struct http_response *rs = c->response;
 383     struct conf_service *service = 0; /* no service (yet) */
 384
 385     if (r->content_len && content_type &&
 386         !yaz_strcmp_del("text/xml", content_type, "; "))
 387     {
 388         xmlDoc *doc = xmlParseMemory(r->content_buf, r->content_len);
 389         xmlNode *root_n;
 390         if (!doc)
 391         {
 392             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 393             return;
 394         }
 395         root_n = xmlDocGetRootElement(doc);
 396         service = service_create(c->server, root_n);
 397         xmlFreeDoc(doc);
 398         if (!service)
 399         {
 400             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 401             return;
 402         }
 403     }
 404
 405     if (!service)
 406     {
 407         const char *service_name = http_argbyname(c->request, "service");
 408         service = locate_service(c->server, service_name);
 409         if (!service)
 410         {
 411             error(rs, PAZPAR2_NO_SERVICE, service_name ? service_name : "unnamed");
 412             return;
 413         }
 414     }
 415     sesid = make_sessionid();
 416     s = http_session_create(service, c->http_sessions, sesid);
 417
 418     yaz_log(c->http_sessions->log_level, "%p Session init %u ", s, sesid);
 419     if (!clear || *clear == '0')
 420         session_init_databases(s->psession);
 421     else
 422         yaz_log(YLOG_LOG, "HTTP Session %u init: No databases preloaded", sesid);
 423
 424     if (process_settings(s->psession, c->request, c->response) < 0)
 425         return;
 426
 427     sprintf(buf, HTTP_COMMAND_RESPONSE_PREFIX
 428             "<init><status>OK</status><session>%d", sesid);
 429     if (c->server->server_id)
 430     {
 431         strcat(buf, ".");
 432         strcat(buf, c->server->server_id);
 433     }
 434     strcat(buf, "</session>"
 435            "<protocol>" PAZPAR2_PROTOCOL_VERSION "</protocol></init>");
 436     rs->payload = nmem_strdup(c->nmem, buf);
 437     http_send_response(c);
 438 }
 439
 440 static void apply_local_setting(void *client_data,
 441                                 struct setting *set)
 442 {
 443     struct session *se =  (struct session *) client_data;
 444
 445     session_apply_setting(se, nmem_strdup(se->session_nmem, set->target),
 446                           nmem_strdup(se->session_nmem, set->name),
 447                           nmem_strdup(se->session_nmem, set->value));
 448 }
 449
 450 static void cmd_settings(struct http_channel *c)
 451 {
 452     struct http_response *rs = c->response;
 453     struct http_request *rq = c->request;
 454     struct http_session *s = locate_session(c);
 455     const char *content_type = http_lookup_header(rq->headers, "Content-Type");
 456
 457     if (!s)
 458         return;
 459
 460     if (rq->content_len && content_type &&
 461         !yaz_strcmp_del("text/xml", content_type, "; "))
 462     {
 463         xmlDoc *doc = xmlParseMemory(rq->content_buf, rq->content_len);
 464         xmlNode *root_n;
 465         if (!doc)
 466         {
 467             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 468             return;
 469         }
 470         root_n = xmlDocGetRootElement(doc);
 471
 472         settings_read_node_x(root_n, s->psession, apply_local_setting);
 473
 474         xmlFreeDoc(doc);
 475     }
 476     if (process_settings(s->psession, rq, rs) < 0) {
 477         release_session(c,s);
 478         return;
 479     }
 480     rs->payload = HTTP_COMMAND_RESPONSE_PREFIX "<settings><status>OK</status></settings>";
 481     http_send_response(c);
 482     release_session(c,s);
 483 }
 484
 485 // Compares two hitsbytarget nodes by hitcount
 486 static int cmp_ht(const void *p1, const void *p2)
 487 {
 488     const struct hitsbytarget *h1 = p1;
 489     const struct hitsbytarget *h2 = p2;
 490     return h2->hits - h1->hits;
 491 }
 492
 493 // This implements functionality somewhat similar to 'bytarget', but in a termlist form
 494 static int targets_termlist(WRBUF wrbuf, struct session *se, int num,
 495                              NMEM nmem)
 496 {
 497     struct hitsbytarget *ht;
 498     int count, i;
 499
 500     ht = hitsbytarget(se, &count, nmem);
 501     qsort(ht, count, sizeof(struct hitsbytarget), cmp_ht);
 502     for (i = 0; i < count && i < num && ht[i].hits > 0; i++)
 503     {
 504
 505         // do only print terms which have display names
 506
 507         wrbuf_puts(wrbuf, "<term>\n");
 508
 509         wrbuf_puts(wrbuf, "<id>");
 510         wrbuf_xmlputs(wrbuf, ht[i].id);
 511         wrbuf_puts(wrbuf, "</id>\n");
 512
 513         wrbuf_puts(wrbuf, "<name>");
 514         if (!ht[i].name || !ht[i].name[0])
 515             wrbuf_xmlputs(wrbuf, "NO TARGET NAME");
 516         else
 517             wrbuf_xmlputs(wrbuf, ht[i].name);
 518         wrbuf_puts(wrbuf, "</name>\n");
 519
 520         wrbuf_printf(wrbuf, "<frequency>" ODR_INT_PRINTF "</frequency>\n",
 521                      ht[i].hits);
 522
 523         wrbuf_puts(wrbuf, "<state>");
 524         wrbuf_xmlputs(wrbuf, ht[i].state);
 525         wrbuf_puts(wrbuf, "</state>\n");
 526
 527         wrbuf_printf(wrbuf, "<diagnostic>%d</diagnostic>\n",
 528                      ht[i].diagnostic);
 529         wrbuf_puts(wrbuf, "</term>\n");
 530     }
 531     return count;
 532 }
 533
 534 static void cmd_termlist(struct http_channel *c)
 535 {
 536     struct http_response *rs = c->response;
 537     struct http_request *rq = c->request;
 538     struct http_session *s = locate_session(c);
 539     struct termlist_score **p;
 540     int len;
 541     int i;
 542     const char *name = http_argbyname(rq, "name");
 543     const char *nums = http_argbyname(rq, "num");
 544     int num = 15;
 545     int status;
 546     WRBUF debug_log = wrbuf_alloc();
 547
 548     if (!s)
 549         return;
 550
 551     status = session_active_clients(s->psession);
 552
 553     if (!name)
 554         name = "subject";
 555     if (strlen(name) > 255)
 556         return;
 557     if (nums)
 558         num = atoi(nums);
 559
 560     wrbuf_rewind(c->wrbuf);
 561
 562     wrbuf_puts(c->wrbuf, "<termlist>\n");
 563     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", status);
 564     while (*name)
 565     {
 566         char tname[256];
 567         const char *tp;
 568
 569         if (!(tp = strchr(name, ',')))
 570             tp = name + strlen(name);
 571         strncpy(tname, name, tp - name);
 572         tname[tp - name] = '\0';
 573         wrbuf_puts(c->wrbuf, "<list name=\"");
 574         wrbuf_xmlputs(c->wrbuf, tname);
 575         wrbuf_puts(c->wrbuf, "\">\n");
 576         if (!strcmp(tname, "xtargets")) {
 577             int targets = targets_termlist(c->wrbuf, s->psession, num, c->nmem);
 578             wrbuf_printf(debug_log, " xtargets: %d", targets);
 579         }
 580         else
 581         {
 582             p = termlist(s->psession, tname, &len);
 583             if (p && len)
 584                 wrbuf_printf(debug_log, " %s: %d", tname, len);
 585             if (p) {
 586                 for (i = 0; i < len && i < num; i++){
 587                     // prevnt sending empty term elements
 588                     if (!p[i]->term || !p[i]->term[0])
 589                         continue;
 590
 591                     wrbuf_puts(c->wrbuf, "<term>");
 592                     wrbuf_puts(c->wrbuf, "<name>");
 593                     wrbuf_xmlputs(c->wrbuf, p[i]->term);
 594                     wrbuf_puts(c->wrbuf, "</name>");
 595
 596                     wrbuf_printf(c->wrbuf,
 597                                  "<frequency>%d</frequency>",
 598                                  p[i]->frequency);
 599                     wrbuf_puts(c->wrbuf, "</term>\n");
 600                }
 601             }
 602         }
 603         wrbuf_puts(c->wrbuf, "</list>\n");
 604         name = tp;
 605         if (*name == ',')
 606             name++;
 607     }
 608     wrbuf_puts(c->wrbuf, "</termlist>\n");
 609     yaz_log(YLOG_DEBUG, "termlist response: %s ", wrbuf_cstr(debug_log));
 610     wrbuf_destroy(debug_log);
 611     rs->payload = nmem_strdup(rq->channel->nmem, wrbuf_cstr(c->wrbuf));
 612     http_send_response(c);
 613     release_session(c,s);
 614 }
 615
 616 size_t session_get_memory_status(struct session *session);
 617
 618 static void session_status(struct http_channel *c, struct http_session *s)
 619 {
 620     size_t session_nmem;
 621     wrbuf_printf(c->wrbuf, "<http_count>%u</http_count>\n", s->activity_counter);
 622     wrbuf_printf(c->wrbuf, "<http_nmem>%zu</http_nmem>\n", nmem_total(s->nmem) );
 623     session_nmem = session_get_memory_status(s->psession);
 624     wrbuf_printf(c->wrbuf, "<session_nmem>%zu</session_nmem>\n", session_nmem);
 625 }
 626
 627 static void cmd_session_status(struct http_channel *c) {
 628     struct http_response *rs = c->response;
 629     struct http_session *s = locate_session(c);
 630     if (!s)
 631         return;
 632
 633     wrbuf_rewind(c->wrbuf);
 634     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<sessionstatus><status>OK</status>\n");
 635     session_status(c, s);
 636     wrbuf_puts(c->wrbuf, "</sessionstatus>\n");
 637     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 638     http_send_response(c);
 639     release_session(c,s);
 640
 641 }
 642
 643 int sessions_count(void);
 644 int clients_count(void);
 645 #ifdef HAVE_RESULTSETS_COUNT
 646 int resultsets_count(void);
 647 #else
 648 #define resultsets_count()      0
 649 #endif
 650
 651 static void cmd_server_status(struct http_channel *c)
 652 {
 653     struct http_response *rs = c->response;
 654     int sessions   = sessions_count();
 655     int clients    = clients_count();
 656     int resultsets = resultsets_count();
 657     wrbuf_rewind(c->wrbuf);
 658     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<server-status>\n");
 659     wrbuf_printf(c->wrbuf, "  <sessions>%u</sessions>\n", sessions);
 660     wrbuf_printf(c->wrbuf, "  <clients>%u</clients>\n",   clients);
 661     /* Only works if yaz has been compiled with enabling of this */
 662     wrbuf_printf(c->wrbuf, "  <resultsets>%u</resultsets>\n",resultsets);
 663     print_meminfo(c->wrbuf);
 664
 665 /* TODO add all sessions status                         */
 666 /*    http_sessions_t http_sessions = c->http_sessions; */
 667 /*    struct http_session *p;                           */
 668 /*
 669     yaz_mutex_enter(http_sessions->mutex);
 670     for (p = http_sessions->session_list; p; p = p->next) {
 671         p->activity_counter++;
 672         wrbuf_puts(c->wrbuf, "<session-status>\n");
 673         wrbuf_printf(c->wrbuf, "<id>%s</id>\n", p->session_id);
 674         yaz_mutex_leave(http_sessions->mutex);
 675         session_status(c, p);
 676         wrbuf_puts(c->wrbuf, "</session-status>\n");
 677         yaz_mutex_enter(http_sessions->mutex);
 678         p->activity_counter--;
 679     }
 680     yaz_mutex_leave(http_sessions->mutex);
 681 */
 682     wrbuf_puts(c->wrbuf, "</server-status>\n");
 683     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 684     http_send_response(c);
 685     xmalloc_trav(0);
 686 }
 687
 688
 689 static void cmd_bytarget(struct http_channel *c)
 690 {
 691     struct http_response *rs = c->response;
 692     struct http_request *rq = c->request;
 693     struct http_session *s = locate_session(c);
 694     struct hitsbytarget *ht;
 695     const char *settings = http_argbyname(rq, "settings");
 696     int count, i;
 697
 698     if (!s)
 699         return;
 700     ht = hitsbytarget(s->psession, &count, c->nmem);
 701     wrbuf_rewind(c->wrbuf);
 702     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<bytarget><status>OK</status>");
 703
 704     for (i = 0; i < count; i++)
 705     {
 706         wrbuf_puts(c->wrbuf, "\n<target>");
 707
 708         wrbuf_puts(c->wrbuf, "<id>");
 709         wrbuf_xmlputs(c->wrbuf, ht[i].id);
 710         wrbuf_puts(c->wrbuf, "</id>\n");
 711
 712         if (ht[i].name && ht[i].name[0])
 713         {
 714             wrbuf_puts(c->wrbuf, "<name>");
 715             wrbuf_xmlputs(c->wrbuf, ht[i].name);
 716             wrbuf_puts(c->wrbuf, "</name>\n");
 717         }
 718
 719         wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", ht[i].hits);
 720         wrbuf_printf(c->wrbuf, "<diagnostic>%d</diagnostic>\n", ht[i].diagnostic);
 721         wrbuf_printf(c->wrbuf, "<records>%d</records>\n", ht[i].records);
 722
 723         wrbuf_puts(c->wrbuf, "<state>");
 724         wrbuf_xmlputs(c->wrbuf, ht[i].state);
 725         wrbuf_puts(c->wrbuf, "</state>\n");
 726         if (settings && *settings == '1')
 727         {
 728             wrbuf_puts(c->wrbuf, "<settings>\n");
 729             wrbuf_puts(c->wrbuf, ht[i].settings_xml);
 730             wrbuf_puts(c->wrbuf, "</settings>\n");
 731         }
 732         wrbuf_puts(c->wrbuf, "</target>");
 733     }
 734
 735     wrbuf_puts(c->wrbuf, "</bytarget>");
 736     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 737     http_send_response(c);
 738     release_session(c,s);
 739 }
 740
 741 static void write_metadata(WRBUF w, struct conf_service *service,
 742         struct record_metadata **ml, int full)
 743 {
 744     int imeta;
 745
 746     for (imeta = 0; imeta < service->num_metadata; imeta++)
 747     {
 748         struct conf_metadata *cmd = &service->metadata[imeta];
 749         struct record_metadata *md;
 750         if (!cmd->brief && !full)
 751             continue;
 752         for (md = ml[imeta]; md; md = md->next)
 753         {
 754             struct record_metadata_attr *attr = md->attributes;
 755             wrbuf_printf(w, "\n<md-%s", cmd->name);
 756
 757             for (; attr; attr = attr->next)
 758             {
 759                 wrbuf_printf(w, " %s=\"", attr->name);
 760                 wrbuf_xmlputs(w, attr->value);
 761                 wrbuf_puts(w, "\"");
 762             }
 763             wrbuf_puts(w, ">");
 764             switch (cmd->type)
 765             {
 766                 case Metadata_type_generic:
 767                     wrbuf_xmlputs(w, md->data.text.disp);
 768                     break;
 769                 case Metadata_type_year:
 770                     wrbuf_printf(w, "%d", md->data.number.min);
 771                     if (md->data.number.min != md->data.number.max)
 772                         wrbuf_printf(w, "-%d", md->data.number.max);
 773                     break;
 774                 default:
 775                     wrbuf_puts(w, "[can't represent]");
 776             }
 777             wrbuf_printf(w, "</md-%s>", cmd->name);
 778         }
 779     }
 780 }
 781
 782 static void write_subrecord(struct record *r, WRBUF w,
 783         struct conf_service *service, int show_details)
 784 {
 785     const char *name = session_setting_oneval(
 786         client_get_database(r->client), PZ_NAME);
 787
 788     wrbuf_puts(w, "<location id=\"");
 789     wrbuf_xmlputs(w, client_get_database(r->client)->database->url);
 790     wrbuf_puts(w, "\" ");
 791
 792     wrbuf_puts(w, "name=\"");
 793     wrbuf_xmlputs(w,  *name ? name : "Unknown");
 794     wrbuf_puts(w, "\">");
 795
 796     write_metadata(w, service, r->metadata, show_details);
 797     wrbuf_puts(w, "</location>\n");
 798 }
 799
 800 static void show_raw_record_error(void *data, const char *addinfo)
 801 {
 802     http_channel_observer_t obs = data;
 803     struct http_channel *c = http_channel_observer_chan(obs);
 804     struct http_response *rs = c->response;
 805
 806     http_remove_observer(obs);
 807
 808     error(rs, PAZPAR2_RECORD_FAIL, addinfo);
 809 }
 810
 811 static void show_raw_record_ok(void *data, const char *buf, size_t sz)
 812 {
 813     http_channel_observer_t obs = data;
 814     struct http_channel *c = http_channel_observer_chan(obs);
 815     struct http_response *rs = c->response;
 816
 817     http_remove_observer(obs);
 818
 819     wrbuf_write(c->wrbuf, buf, sz);
 820     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 821     http_send_response(c);
 822 }
 823
 824
 825 static void show_raw_record_ok_binary(void *data, const char *buf, size_t sz)
 826 {
 827     http_channel_observer_t obs = data;
 828     struct http_channel *c = http_channel_observer_chan(obs);
 829     struct http_response *rs = c->response;
 830
 831     http_remove_observer(obs);
 832
 833     wrbuf_write(c->wrbuf, buf, sz);
 834     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 835
 836     rs->content_type = "application/octet-stream";
 837     http_send_response(c);
 838 }
 839
 840
 841 void show_raw_reset(void *data, struct http_channel *c, void *data2)
 842 {
 843     //struct client *client = data;
 844     //client_show_raw_remove(client, data2);
 845 }
 846
 847 static void cmd_record_ready(void *data);
 848
 849 static void cmd_record(struct http_channel *c)
 850 {
 851     struct http_response *rs = c->response;
 852     struct http_request *rq = c->request;
 853     struct http_session *s = locate_session(c);
 854     struct record_cluster *rec, *prev_r, *next_r;
 855     struct record *r;
 856     struct conf_service *service;
 857     const char *idstr = http_argbyname(rq, "id");
 858     const char *offsetstr = http_argbyname(rq, "offset");
 859     const char *binarystr = http_argbyname(rq, "binary");
 860
 861     if (!s)
 862         return;
 863     service = s->psession->service;
 864     if (!idstr)
 865     {
 866         error(rs, PAZPAR2_MISSING_PARAMETER, "id");
 867         return;
 868     }
 869     wrbuf_rewind(c->wrbuf);
 870     if (!(rec = show_single_start(s->psession, idstr, &prev_r, &next_r)))
 871     {
 872         if (session_active_clients(s->psession) == 0)
 873         {
 874             error(rs, PAZPAR2_RECORD_MISSING, idstr);
 875         }
 876         else if (session_set_watch(s->psession, SESSION_WATCH_RECORD,
 877                               cmd_record_ready, c, c) != 0)
 878         {
 879             error(rs, PAZPAR2_RECORD_MISSING, idstr);
 880         }
 881         release_session(c, s);
 882         return;
 883     }
 884     if (offsetstr)
 885     {
 886         int offset = atoi(offsetstr);
 887         const char *syntax = http_argbyname(rq, "syntax");
 888         const char *esn = http_argbyname(rq, "esn");
 889         int i;
 890         struct record*r = rec->records;
 891         int binary = 0;
 892
 893         if (binarystr && *binarystr != '0')
 894             binary = 1;
 895
 896         for (i = 0; i < offset && r; r = r->next, i++)
 897             ;
 898         if (!r)
 899         {
 900             error(rs, PAZPAR2_RECORD_FAIL, "no record at offset given");
 901         }
 902         else
 903         {
 904             http_channel_observer_t obs =
 905                 http_add_observer(c, r->client, show_raw_reset);
 906             int ret = client_show_raw_begin(r->client, r->position,
 907                                         syntax, esn,
 908                                         obs /* data */,
 909                                         show_raw_record_error,
 910                                         (binary ?
 911                                          show_raw_record_ok_binary :
 912                                          show_raw_record_ok),
 913                                         (binary ? 1 : 0));
 914             if (ret == -1)
 915             {
 916                 http_remove_observer(obs);
 917                 error(rs, PAZPAR2_NO_SESSION, 0);
 918             }
 919         }
 920     }
 921     else
 922     {
 923         wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<record>\n");
 924         wrbuf_puts(c->wrbuf, "<recid>");
 925         wrbuf_xmlputs(c->wrbuf, rec->recid);
 926         wrbuf_puts(c->wrbuf, "</recid>\n");
 927         if (prev_r)
 928         {
 929             wrbuf_puts(c->wrbuf, "<prevrecid>");
 930             wrbuf_xmlputs(c->wrbuf, prev_r->recid);
 931             wrbuf_puts(c->wrbuf, "</prevrecid>\n");
 932         }
 933         if (next_r)
 934         {
 935             wrbuf_puts(c->wrbuf, "<nextrecid>");
 936             wrbuf_xmlputs(c->wrbuf, next_r->recid);
 937             wrbuf_puts(c->wrbuf, "</nextrecid>\n");
 938         }
 939         wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n",
 940                      session_active_clients(s->psession));
 941         write_metadata(c->wrbuf, service, rec->metadata, 1);
 942         for (r = rec->records; r; r = r->next)
 943             write_subrecord(r, c->wrbuf, service, 1);
 944         wrbuf_puts(c->wrbuf, "</record>\n");
 945         rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 946         http_send_response(c);
 947     }
 948     show_single_stop(s->psession, rec);
 949     release_session(c, s);
 950 }
 951
 952 static void cmd_record_ready(void *data)
 953 {
 954     struct http_channel *c = (struct http_channel *) data;
 955
 956     cmd_record(c);
 957 }
 958
 959 static void show_records(struct http_channel *c, int active)
 960 {
 961     struct http_request *rq = c->request;
 962     struct http_response *rs = c->response;
 963     struct http_session *s = locate_session(c);
 964     struct record_cluster **rl;
 965     struct reclist_sortparms *sp;
 966     const char *start = http_argbyname(rq, "start");
 967     const char *num = http_argbyname(rq, "num");
 968     const char *sort = http_argbyname(rq, "sort");
 969     int startn = 0;
 970     int numn = 20;
 971     int total;
 972     Odr_int total_hits;
 973     int i;
 974
 975     if (!s)
 976         return;
 977
 978     // We haven't counted clients yet if we're called on a block release
 979     if (active < 0)
 980         active = session_active_clients(s->psession);
 981
 982     if (start)
 983         startn = atoi(start);
 984     if (num)
 985         numn = atoi(num);
 986     if (!sort)
 987         sort = "relevance";
 988     if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
 989     {
 990         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
 991         release_session(c, s);
 992         return;
 993     }
 994
 995
 996     rl = show_range_start(s->psession, sp, startn, &numn, &total, &total_hits);
 997
 998     wrbuf_rewind(c->wrbuf);
 999     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<show>\n<status>OK</status>\n");
1000     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", active);
1001     wrbuf_printf(c->wrbuf, "<merged>%d</merged>\n", total);
1002     wrbuf_printf(c->wrbuf, "<total>" ODR_INT_PRINTF "</total>\n", total_hits);
1003     wrbuf_printf(c->wrbuf, "<start>%d</start>\n", startn);
1004     wrbuf_printf(c->wrbuf, "<num>%d</num>\n", numn);
1005
1006     for (i = 0; i < numn; i++)
1007     {
1008         int ccount;
1009         struct record *p;
1010         struct record_cluster *rec = rl[i];
1011         struct conf_service *service = s->psession->service;
1012
1013         wrbuf_puts(c->wrbuf, "<hit>\n");
1014         write_metadata(c->wrbuf, service, rec->metadata, 0);
1015         for (ccount = 0, p = rl[i]->records; p;  p = p->next, ccount++)
1016             write_subrecord(p, c->wrbuf, service, 0); // subrecs w/o details
1017         if (ccount > 1)
1018             wrbuf_printf(c->wrbuf, "<count>%d</count>\n", ccount);
1019         if (strstr(sort, "relevance"))
1020             wrbuf_printf(c->wrbuf, "<relevance>%d</relevance>\n",
1021                          rec->relevance_score);
1022         wrbuf_puts(c->wrbuf, "<recid>");
1023         wrbuf_xmlputs(c->wrbuf, rec->recid);
1024         wrbuf_puts(c->wrbuf, "</recid>\n");
1025         wrbuf_puts(c->wrbuf, "</hit>\n");
1026     }
1027
1028     show_range_stop(s->psession, rl);
1029
1030     wrbuf_puts(c->wrbuf, "</show>\n");
1031     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
1032     http_send_response(c);
1033     release_session(c, s);
1034 }
1035
1036 static void show_records_ready(void *data)
1037 {
1038     struct http_channel *c = (struct http_channel *) data;
1039
1040     show_records(c, -1);
1041 }
1042
1043 static void cmd_show(struct http_channel *c)
1044 {
1045     struct http_request *rq = c->request;
1046     struct http_session *s = locate_session(c);
1047     const char *block = http_argbyname(rq, "block");
1048     int status;
1049
1050     if (!s)
1051         return;
1052
1053     status = session_active_clients(s->psession);
1054
1055     if (block)
1056     {
1057         if (!strcmp(block, "preferred") && !session_is_preferred_clients_ready(s->psession) && reclist_get_num_records(s->psession->reclist) == 0) {
1058             // if there is already a watch/block. we do not block this one
1059             if (session_set_watch(s->psession, SESSION_WATCH_SHOW_PREF,
1060                                   show_records_ready, c, c) != 0)
1061             {
1062                 yaz_log(c->http_sessions->log_level,
1063                         "%p Session %u: Blocking on cmd_show. Waiting for preferred targets", s, s->session_id);
1064             }
1065             release_session(c,s);
1066             return;
1067
1068         }
1069         else if (status && reclist_get_num_records(s->psession->reclist) == 0)
1070         {
1071             // if there is already a watch/block. we do not block this one
1072             if (session_set_watch(s->psession, SESSION_WATCH_SHOW,
1073                                   show_records_ready, c, c) != 0)
1074             {
1075                 yaz_log(c->http_sessions->log_level, "%p Session %u: Blocking on cmd_show", s, s->session_id);
1076             }
1077             release_session(c,s);
1078             return;
1079         }
1080     }
1081     show_records(c, status);
1082     release_session(c,s);
1083 }
1084
1085 static void cmd_ping(struct http_channel *c)
1086 {
1087     struct http_response *rs = c->response;
1088     struct http_session *s = locate_session(c);
1089     if (!s)
1090         return;
1091     rs->payload = HTTP_COMMAND_RESPONSE_PREFIX "<ping><status>OK</status></ping>";
1092     http_send_response(c);
1093     release_session(c, s);
1094 }
1095
1096 static int utf_8_valid(const char *str)
1097 {
1098     yaz_iconv_t cd = yaz_iconv_open("utf-8", "utf-8");
1099     if (cd)
1100     {
1101         /* check that query is UTF-8 encoded */
1102         char *inbuf = (char *) str; /* we know iconv does not alter this */
1103         size_t inbytesleft = strlen(inbuf);
1104
1105         size_t outbytesleft = strlen(inbuf) + 10;
1106         char *out = xmalloc(outbytesleft);
1107         char *outbuf = out;
1108         size_t r = yaz_iconv(cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
1109
1110         /* if OK, try flushing the rest  */
1111         if (r != (size_t) (-1))
1112             r = yaz_iconv(cd, 0, 0, &outbuf, &outbytesleft);
1113         yaz_iconv_close(cd);
1114         xfree(out);
1115         if (r == (size_t) (-1))
1116             return 0;
1117     }
1118     return 1;
1119 }
1120
1121 static void cmd_search(struct http_channel *c)
1122 {
1123     struct http_request *rq = c->request;
1124     struct http_response *rs = c->response;
1125     struct http_session *s = locate_session(c);
1126     const char *query = http_argbyname(rq, "query");
1127     const char *filter = http_argbyname(rq, "filter");
1128     const char *maxrecs = http_argbyname(rq, "maxrecs");
1129     const char *startrecs = http_argbyname(rq, "startrecs");
1130     enum pazpar2_error_code code;
1131     const char *addinfo = 0;
1132
1133     if (!s)
1134         return;
1135     if (!query)
1136     {
1137         error(rs, PAZPAR2_MISSING_PARAMETER, "query");
1138         release_session(c,s);
1139         return;
1140     }
1141     if (!utf_8_valid(query))
1142     {
1143         error(rs, PAZPAR2_MALFORMED_PARAMETER_ENCODING, "query");
1144         release_session(c,s);
1145         return;
1146     }
1147     code = search(s->psession, query, startrecs, maxrecs, filter, &addinfo);
1148     if (code)
1149     {
1150         error(rs, code, addinfo);
1151         release_session(c,s);
1152         return;
1153     }
1154     rs->payload = HTTP_COMMAND_RESPONSE_PREFIX "<search><status>OK</status></search>";
1155     http_send_response(c);
1156     release_session(c,s);
1157 }
1158
1159
1160 static void cmd_stat(struct http_channel *c)
1161 {
1162     struct http_response *rs = c->response;
1163     struct http_session *s = locate_session(c);
1164     struct statistics stat;
1165     int clients;
1166
1167     float progress = 0;
1168
1169     if (!s)
1170         return;
1171
1172     clients = session_active_clients(s->psession);
1173     statistics(s->psession, &stat);
1174
1175     if (stat.num_clients > 0) {
1176         progress = (stat.num_clients  - clients) / (float)stat.num_clients;
1177     }
1178
1179     wrbuf_rewind(c->wrbuf);
1180     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<stat>");
1181     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", clients);
1182     wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", stat.num_hits);
1183     wrbuf_printf(c->wrbuf, "<records>%d</records>\n", stat.num_records);
1184     wrbuf_printf(c->wrbuf, "<clients>%d</clients>\n", stat.num_clients);
1185     wrbuf_printf(c->wrbuf, "<unconnected>%d</unconnected>\n", stat.num_no_connection);
1186     wrbuf_printf(c->wrbuf, "<connecting>%d</connecting>\n", stat.num_connecting);
1187     wrbuf_printf(c->wrbuf, "<working>%d</working>\n", stat.num_working);
1188     wrbuf_printf(c->wrbuf, "<idle>%d</idle>\n", stat.num_idle);
1189     wrbuf_printf(c->wrbuf, "<failed>%d</failed>\n", stat.num_failed);
1190     wrbuf_printf(c->wrbuf, "<error>%d</error>\n", stat.num_error);
1191     wrbuf_printf(c->wrbuf, "<progress>%.2f</progress>\n", progress);
1192     wrbuf_puts(c->wrbuf, "</stat>");
1193     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
1194     http_send_response(c);
1195     release_session(c,s);
1196 }
1197
1198 static void cmd_info(struct http_channel *c)
1199 {
1200     char yaz_version_str[20];
1201     struct http_response *rs = c->response;
1202
1203     wrbuf_rewind(c->wrbuf);
1204     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<info>\n");
1205     wrbuf_puts(c->wrbuf, " <version>\n");
1206     wrbuf_puts(c->wrbuf, "  <pazpar2");
1207 #ifdef PAZPAR2_VERSION_SHA1
1208     wrbuf_printf(c->wrbuf, " sha1=\"%s\"", PAZPAR2_VERSION_SHA1);
1209 #endif
1210     wrbuf_puts(c->wrbuf, ">");
1211     wrbuf_xmlputs(c->wrbuf, VERSION);
1212     wrbuf_puts(c->wrbuf, "</pazpar2>");
1213
1214
1215     yaz_version(yaz_version_str, 0);
1216     wrbuf_puts(c->wrbuf, "  <yaz compiled=\"");
1217     wrbuf_xmlputs(c->wrbuf, YAZ_VERSION);
1218     wrbuf_puts(c->wrbuf, "\">");
1219     wrbuf_xmlputs(c->wrbuf, yaz_version_str);
1220     wrbuf_puts(c->wrbuf, "</yaz>\n");
1221
1222     wrbuf_puts(c->wrbuf, " </version>\n");
1223
1224     info_services(c->server, c->wrbuf);
1225
1226     wrbuf_puts(c->wrbuf, "</info>");
1227     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
1228     http_send_response(c);
1229 }
1230
1231 struct {
1232     char *name;
1233     void (*fun)(struct http_channel *c);
1234 } commands[] = {
1235     { "init", cmd_init },
1236     { "settings", cmd_settings },
1237     { "stat", cmd_stat },
1238     { "bytarget", cmd_bytarget },
1239     { "show", cmd_show },
1240     { "search", cmd_search },
1241     { "termlist", cmd_termlist },
1242     { "exit", cmd_exit },
1243     { "session-status", cmd_session_status },
1244     { "server-status", cmd_server_status },
1245     { "ping", cmd_ping },
1246     { "record", cmd_record },
1247     { "info", cmd_info },
1248     {0,0}
1249 };
1250
1251 void http_command(struct http_channel *c)
1252 {
1253     const char *command = http_argbyname(c->request, "command");
1254     struct http_response *rs = http_create_response(c);
1255     int i;
1256
1257     c->response = rs;
1258
1259     http_addheader(rs, "Expires", "Thu, 19 Nov 1981 08:52:00 GMT");
1260     http_addheader(rs, "Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
1261
1262     if (!command)
1263     {
1264         error(rs, PAZPAR2_MISSING_PARAMETER, "command");
1265         return;
1266     }
1267     for (i = 0; commands[i].name; i++)
1268         if (!strcmp(commands[i].name, command))
1269         {
1270             (*commands[i].fun)(c);
1271             break;
1272         }
1273     if (!commands[i].name)
1274         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "command");
1275
1276     return;
1277 }
1278
1279 /*
1280  * Local variables:
1281  * c-basic-offset: 4
1282  * c-file-style: "Stroustrup"
1283  * indent-tabs-mode: nil
1284  * End:
1285  * vim: shiftwidth=4 tabstop=8 expandtab
1286  */
1287