src/http_command.c

   1 /* This file is part of Pazpar2.
   2    Copyright (C) 2006-2012 Index Data
   3
   4 Pazpar2 is free software; you can redistribute it and/or modify it under
   5 the terms of the GNU General Public License as published by the Free
   6 Software Foundation; either version 2, or (at your option) any later
   7 version.
   8
   9 Pazpar2 is distributed in the hope that it will be useful, but WITHOUT ANY
  10 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17
  18 */
  19
  20 #if HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23 #include <stdio.h>
  24 #include <sys/types.h>
  25 #if HAVE_UNISTD_H
  26 #include <unistd.h>
  27 #endif
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #if HAVE_SYS_TIME_H
  31 #include <sys/time.h>
  32 #endif
  33 #include <yaz/snprintf.h>
  34 #include <yaz/yaz-util.h>
  35
  36 #include "ppmutex.h"
  37 #include "eventl.h"
  38 #include "parameters.h"
  39 #include "session.h"
  40 #include "http.h"
  41 #include "settings.h"
  42 #include "client.h"
  43
  44 #ifdef HAVE_MALLINFO
  45 #include <malloc.h>
  46
  47 void print_meminfo(WRBUF wrbuf)
  48 {
  49     struct mallinfo minfo;
  50     minfo = mallinfo();
  51     wrbuf_printf(wrbuf, "  <memory>\n"
  52                         "   <arena>%d</arena>\n"
  53                         "   <uordblks>%d</uordblks>\n"
  54                         "   <fordblks>%d</fordblks>\n"
  55                         "   <ordblks>%d</ordblks>\n"
  56                         "   <keepcost>%d</keepcost>\n"
  57                         "   <hblks>%d</hblks>\n"
  58                         "   <hblkhd>%d</hblkhd>\n"
  59                         "   <virt>%d</virt>\n"
  60                         "   <virtuse>%d</virtuse>\n"
  61                         "  </memory>\n",
  62                  minfo.arena, minfo.uordblks, minfo.fordblks,minfo.ordblks, minfo.keepcost, minfo.hblks, minfo.hblkhd, minfo.arena + minfo.hblkhd, minfo.uordblks + minfo.hblkhd);
  63
  64 }
  65 #else
  66 #define print_meminfo(x)
  67 #endif
  68
  69
  70 // Update this when the protocol changes
  71 #define PAZPAR2_PROTOCOL_VERSION "1"
  72
  73 #define HTTP_COMMAND_RESPONSE_PREFIX "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
  74
  75 struct http_session {
  76     IOCHAN timeout_iochan;     // NOTE: This is NOT associated with a socket
  77     struct session *psession;
  78     unsigned int session_id;
  79     int timestamp;
  80     int destroy_counter;
  81     int activity_counter;
  82     NMEM nmem;
  83     http_sessions_t http_sessions;
  84     struct http_session *next;
  85 };
  86
  87 struct http_sessions {
  88     struct http_session *session_list;
  89     YAZ_MUTEX mutex;
  90     int log_level;
  91 };
  92
  93 static YAZ_MUTEX g_http_session_mutex = 0;
  94 static int g_http_sessions = 0;
  95
  96 int http_session_use(int delta)
  97 {
  98     int sessions;
  99     if (!g_http_session_mutex)
 100         yaz_mutex_create(&g_http_session_mutex);
 101     yaz_mutex_enter(g_http_session_mutex);
 102     g_http_sessions += delta;
 103     sessions = g_http_sessions;
 104     yaz_mutex_leave(g_http_session_mutex);
 105     yaz_log(YLOG_DEBUG, "%s sessions=%d", delta == 0 ? "" : (delta > 0 ? "INC" : "DEC"), sessions);
 106     return sessions;
 107
 108 }
 109
 110 http_sessions_t http_sessions_create(void)
 111 {
 112     http_sessions_t hs = xmalloc(sizeof(*hs));
 113     hs->session_list = 0;
 114     hs->mutex = 0;
 115     pazpar2_mutex_create(&hs->mutex, "http_sessions");
 116     hs->log_level = yaz_log_module_level("HTTP");
 117     return hs;
 118 }
 119
 120 void http_sessions_destroy(http_sessions_t hs)
 121 {
 122     if (hs)
 123     {
 124         struct http_session *s = hs->session_list;
 125         while (s)
 126         {
 127             struct http_session *s_next = s->next;
 128             iochan_destroy(s->timeout_iochan);
 129             session_destroy(s->psession);
 130             nmem_destroy(s->nmem);
 131             s = s_next;
 132         }
 133         yaz_mutex_destroy(&hs->mutex);
 134         xfree(hs);
 135     }
 136 }
 137
 138 void http_session_destroy(struct http_session *s);
 139
 140 static void session_timeout(IOCHAN i, int event)
 141 {
 142     struct http_session *s = iochan_getdata(i);
 143     http_session_destroy(s);
 144 }
 145
 146 struct http_session *http_session_create(struct conf_service *service,
 147                                          http_sessions_t http_sessions,
 148                                          unsigned int sesid)
 149 {
 150     NMEM nmem = nmem_create();
 151     struct http_session *r = nmem_malloc(nmem, sizeof(*r));
 152     char tmp_str[50];
 153
 154     sprintf(tmp_str, "session#%u", sesid);
 155     r->psession = new_session(nmem, service, sesid);
 156     r->session_id = sesid;
 157     r->timestamp = 0;
 158     r->nmem = nmem;
 159     r->destroy_counter = r->activity_counter = 0;
 160     r->http_sessions = http_sessions;
 161
 162     yaz_mutex_enter(http_sessions->mutex);
 163     r->next = http_sessions->session_list;
 164     http_sessions->session_list = r;
 165     yaz_mutex_leave(http_sessions->mutex);
 166
 167     r->timeout_iochan = iochan_create(-1, session_timeout, 0, "http_session_timeout");
 168     iochan_setdata(r->timeout_iochan, r);
 169     yaz_log(http_sessions->log_level, "Session %u created. timeout chan=%p timeout=%d", sesid, r->timeout_iochan, service->session_timeout);
 170     iochan_settimeout(r->timeout_iochan, service->session_timeout);
 171
 172     iochan_add(service->server->iochan_man, r->timeout_iochan);
 173     http_session_use(1);
 174     return r;
 175 }
 176
 177 void http_session_destroy(struct http_session *s)
 178 {
 179     int must_destroy = 0;
 180
 181     http_sessions_t http_sessions = s->http_sessions;
 182
 183     yaz_log(http_sessions->log_level, "Session %u destroy", s->session_id);
 184     yaz_mutex_enter(http_sessions->mutex);
 185     /* only if http_session has no active http sessions on it can be destroyed */
 186     if (s->destroy_counter == s->activity_counter)
 187     {
 188         struct http_session **p = 0;
 189         must_destroy = 1;
 190         for (p = &http_sessions->session_list; *p; p = &(*p)->next)
 191             if (*p == s)
 192             {
 193                 *p = (*p)->next;
 194                 break;
 195             }
 196     }
 197     yaz_mutex_leave(http_sessions->mutex);
 198     if (must_destroy)
 199     {   /* destroying for real */
 200         yaz_log(http_sessions->log_level, "Session %u destroyed", s->session_id);
 201         iochan_destroy(s->timeout_iochan);
 202         session_destroy(s->psession);
 203         http_session_use(-1);
 204         nmem_destroy(s->nmem);
 205     }
 206     else {
 207         yaz_log(http_sessions->log_level, "Session %u destroying delayed. Active clients (%d-%d). Waiting for new timeout.",
 208                 s->session_id, s->activity_counter, s->destroy_counter);
 209     }
 210
 211 }
 212
 213 static const char *get_msg(enum pazpar2_error_code code)
 214 {
 215     struct pazpar2_error_msg {
 216         enum pazpar2_error_code code;
 217         const char *msg;
 218     };
 219     static const struct pazpar2_error_msg ar[] = {
 220         { PAZPAR2_NO_SESSION, "Session does not exist or it has expired"},
 221         { PAZPAR2_MISSING_PARAMETER, "Missing parameter"},
 222         { PAZPAR2_MALFORMED_PARAMETER_VALUE, "Malformed parameter value"},
 223         { PAZPAR2_MALFORMED_PARAMETER_ENCODING, "Malformed parameter encoding"},
 224         { PAZPAR2_MALFORMED_SETTING, "Malformed setting argument"},
 225         { PAZPAR2_HITCOUNTS_FAILED, "Failed to retrieve hitcounts"},
 226         { PAZPAR2_RECORD_MISSING, "Record missing"},
 227         { PAZPAR2_NO_TARGETS, "No targets"},
 228         { PAZPAR2_CONFIG_TARGET, "Target cannot be configured"},
 229         { PAZPAR2_RECORD_FAIL, "Record command failed"},
 230         { PAZPAR2_NOT_IMPLEMENTED, "Not implemented"},
 231         { PAZPAR2_NO_SERVICE, "No service"},
 232         { PAZPAR2_ALREADY_BLOCKED, "Already blocked in session on: "},
 233         { PAZPAR2_LAST_ERROR, "Last error"},
 234         { 0, 0 }
 235     };
 236     int i = 0;
 237     while (ar[i].msg)
 238     {
 239         if (code == ar[i].code)
 240             return ar[i].msg;
 241         i++;
 242     }
 243     return "No error";
 244 }
 245
 246 static void error(struct http_response *rs,
 247                   enum pazpar2_error_code code,
 248                   const char *addinfo)
 249 {
 250     struct http_channel *c = rs->channel;
 251     WRBUF text = wrbuf_alloc();
 252     const char *http_status = "417";
 253     const char *msg = get_msg(code);
 254
 255     rs->msg = nmem_strdup(c->nmem, msg);
 256     strcpy(rs->code, http_status);
 257
 258     wrbuf_printf(text, HTTP_COMMAND_RESPONSE_PREFIX "<error code=\"%d\" msg=\"%s\">", (int) code,
 259                msg);
 260     if (addinfo)
 261         wrbuf_xmlputs(text, addinfo);
 262     wrbuf_puts(text, "</error>");
 263
 264     yaz_log(YLOG_WARN, "HTTP %s %s%s%s", http_status,
 265             msg, addinfo ? ": " : "" , addinfo ? addinfo : "");
 266     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(text));
 267     wrbuf_destroy(text);
 268     http_send_response(c);
 269 }
 270
 271 static void response_open_no_status(struct http_channel *c, const char *command)
 272 {
 273     wrbuf_rewind(c->wrbuf);
 274     wrbuf_printf(c->wrbuf, "%s<%s>",
 275                  HTTP_COMMAND_RESPONSE_PREFIX, command);
 276 }
 277
 278 static void response_open(struct http_channel *c, const char *command)
 279 {
 280     response_open_no_status(c, command);
 281     wrbuf_puts(c->wrbuf, "<status>OK</status>");
 282 }
 283
 284 static void response_close(struct http_channel *c, const char *command)
 285 {
 286     struct http_response *rs = c->response;
 287
 288     wrbuf_printf(c->wrbuf, "</%s>", command);
 289     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 290     http_send_response(c);
 291 }
 292
 293 unsigned int make_sessionid(void)
 294 {
 295     static int seq = 0; /* thread pr */
 296     unsigned int res;
 297
 298     seq++;
 299     if (global_parameters.predictable_sessions)
 300         res = seq;
 301     else
 302     {
 303 #ifdef WIN32
 304         res = seq;
 305 #else
 306         struct timeval t;
 307
 308         if (gettimeofday(&t, 0) < 0)
 309         {
 310             yaz_log(YLOG_WARN|YLOG_ERRNO, "gettimeofday");
 311             exit(1);
 312         }
 313         /* at most 256 sessions per second ..
 314            (long long would be more appropriate)*/
 315         res = t.tv_sec;
 316         res = ((res << 8) | (seq & 0xff)) & ((1U << 31) - 1);
 317 #endif
 318     }
 319     return res;
 320 }
 321
 322 static struct http_session *locate_session(struct http_channel *c)
 323 {
 324     struct http_request *rq = c->request;
 325     struct http_response *rs = c->response;
 326     struct http_session *p;
 327     const char *session = http_argbyname(rq, "session");
 328     http_sessions_t http_sessions = c->http_sessions;
 329     unsigned int id;
 330
 331     if (!session)
 332     {
 333         error(rs, PAZPAR2_MISSING_PARAMETER, "session");
 334         return 0;
 335     }
 336     id = atoi(session);
 337     yaz_mutex_enter(http_sessions->mutex);
 338     for (p = http_sessions->session_list; p; p = p->next)
 339         if (id == p->session_id)
 340             break;
 341     if (p)
 342         p->activity_counter++;
 343     yaz_mutex_leave(http_sessions->mutex);
 344     if (p)
 345         iochan_activity(p->timeout_iochan);
 346     else
 347         error(rs, PAZPAR2_NO_SESSION, session);
 348     return p;
 349 }
 350
 351 // Call after use of locate_session, in order to increment the destroy_counter
 352 static void release_session(struct http_channel *c,
 353                             struct http_session *session)
 354 {
 355     http_sessions_t http_sessions = c->http_sessions;
 356     yaz_mutex_enter(http_sessions->mutex);
 357     if (session)
 358         session->destroy_counter++;
 359     yaz_mutex_leave(http_sessions->mutex);
 360 }
 361
 362 // Decode settings parameters and apply to session
 363 // Syntax: setting[target]=value
 364 static int process_settings(struct session *se, struct http_request *rq,
 365                             struct http_response *rs)
 366 {
 367     struct http_argument *a;
 368
 369     for (a = rq->arguments; a; a = a->next)
 370         if (strchr(a->name, '['))
 371         {
 372             char **res;
 373             int num;
 374             char *dbname;
 375             char *setting;
 376
 377             // Nmem_strsplit *rules*!!!
 378             nmem_strsplit(se->session_nmem, "[]", a->name, &res, &num);
 379             if (num != 2)
 380             {
 381                 error(rs, PAZPAR2_MALFORMED_SETTING, a->name);
 382                 return -1;
 383             }
 384             setting = res[0];
 385             dbname = res[1];
 386             session_apply_setting(se, dbname, setting,
 387                     nmem_strdup(se->session_nmem, a->value));
 388         }
 389     return 0;
 390 }
 391
 392 static void cmd_exit(struct http_channel *c)
 393 {
 394     yaz_log(YLOG_WARN, "exit");
 395
 396     response_open(c, "exit");
 397     response_close(c, "exit");
 398     http_close_server(c->server);
 399 }
 400
 401 static void cmd_init(struct http_channel *c)
 402 {
 403     struct http_request *r = c->request;
 404     const char *clear = http_argbyname(r, "clear");
 405     const char *content_type = http_lookup_header(r->headers, "Content-Type");
 406     unsigned int sesid;
 407     struct http_session *s;
 408     struct http_response *rs = c->response;
 409     struct conf_service *service = 0; /* no service (yet) */
 410
 411     if (r->content_len && content_type &&
 412         !yaz_strcmp_del("text/xml", content_type, "; "))
 413     {
 414         xmlDoc *doc = xmlParseMemory(r->content_buf, r->content_len);
 415         xmlNode *root_n;
 416         if (!doc)
 417         {
 418             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 419             return;
 420         }
 421         root_n = xmlDocGetRootElement(doc);
 422         service = service_create(c->server, root_n);
 423         xmlFreeDoc(doc);
 424         if (!service)
 425         {
 426             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 427             return;
 428         }
 429     }
 430
 431     if (!service)
 432     {
 433         const char *service_name = http_argbyname(c->request, "service");
 434         service = locate_service(c->server, service_name);
 435         if (!service)
 436         {
 437             error(rs, PAZPAR2_NO_SERVICE, service_name ? service_name : "unnamed");
 438             return;
 439         }
 440     }
 441     sesid = make_sessionid();
 442     s = http_session_create(service, c->http_sessions, sesid);
 443
 444     yaz_log(c->http_sessions->log_level, "Session init %u ", sesid);
 445     if (!clear || *clear == '0')
 446         session_init_databases(s->psession);
 447     else
 448         yaz_log(YLOG_LOG, "Session %u init: No databases preloaded", sesid);
 449
 450     if (process_settings(s->psession, c->request, c->response) < 0)
 451         return;
 452
 453     response_open(c, "init");
 454     wrbuf_printf(c->wrbuf, "<session>%d", sesid);
 455     if (c->server->server_id)
 456     {
 457         wrbuf_puts(c->wrbuf, ".");
 458         wrbuf_puts(c->wrbuf, c->server->server_id);
 459     }
 460     wrbuf_puts(c->wrbuf, "</session>"
 461                "<protocol>" PAZPAR2_PROTOCOL_VERSION "</protocol>");
 462
 463     response_close(c, "init");
 464 }
 465
 466 static void apply_local_setting(void *client_data,
 467                                 struct setting *set)
 468 {
 469     struct session *se =  (struct session *) client_data;
 470
 471     session_apply_setting(se, nmem_strdup(se->session_nmem, set->target),
 472                           nmem_strdup(se->session_nmem, set->name),
 473                           nmem_strdup(se->session_nmem, set->value));
 474 }
 475
 476 static void cmd_settings(struct http_channel *c)
 477 {
 478     struct http_response *rs = c->response;
 479     struct http_request *rq = c->request;
 480     struct http_session *s = locate_session(c);
 481     const char *content_type = http_lookup_header(rq->headers, "Content-Type");
 482
 483     if (!s)
 484         return;
 485
 486     if (rq->content_len && content_type &&
 487         !yaz_strcmp_del("text/xml", content_type, "; "))
 488     {
 489         xmlDoc *doc = xmlParseMemory(rq->content_buf, rq->content_len);
 490         xmlNode *root_n;
 491         if (!doc)
 492         {
 493             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 494             release_session(c,s);
 495             return;
 496         }
 497         root_n = xmlDocGetRootElement(doc);
 498
 499         settings_read_node_x(root_n, s->psession, apply_local_setting);
 500
 501         xmlFreeDoc(doc);
 502     }
 503     if (process_settings(s->psession, rq, rs) < 0)
 504     {
 505         release_session(c, s);
 506         return;
 507     }
 508     response_open(c, "settings");
 509     response_close(c, "settings");
 510     release_session(c, s);
 511 }
 512
 513 static void termlist_response(struct http_channel *c, struct http_session *s, const char *cmd_status)
 514 {
 515     struct http_request *rq = c->request;
 516     const char *name = http_argbyname(rq, "name");
 517     const char *nums = http_argbyname(rq, "num");
 518     int num = 15;
 519     int status;
 520
 521     if (nums)
 522         num = atoi(nums);
 523
 524     status = session_active_clients(s->psession);
 525
 526     response_open_no_status(c, "termlist");
 527     /* new protocol add a status to response. Triggered by a status parameter */
 528     if (cmd_status != 0) {
 529         wrbuf_printf(c->wrbuf, "<status>%s</status>\n", cmd_status);
 530     }
 531     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", status);
 532
 533     perform_termlist(c, s->psession, name, num);
 534
 535     response_close(c, "termlist");
 536 }
 537
 538 static void termlist_result_ready(void *data)
 539 {
 540     struct http_channel *c = (struct http_channel *) data;
 541     struct http_request *rq = c->request;
 542     const char *report = http_argbyname(rq, "report");
 543     const char *status = 0;
 544     if (report && !strcmp("status", report))
 545         status = "OK";
 546     struct http_session *s = locate_session(c);
 547     if (s) {
 548         yaz_log(c->http_sessions->log_level, "Session %u termlist watch released", s->session_id);
 549         termlist_response(c, s, status);
 550         release_session(c,s);
 551     }
 552 }
 553
 554 static void cmd_termlist(struct http_channel *c)
 555 {
 556     struct http_request *rq = c->request;
 557     struct http_response *rs = c->response;
 558     struct http_session *s = locate_session(c);
 559     const char *block = http_argbyname(rq, "block");
 560     const char *report = http_argbyname(rq, "report");
 561     int report_status = 0;
 562     int report_error = 0;
 563     const char *status_message = 0;
 564     int active_clients;
 565     if (report  && !strcmp("error", report)) {
 566         report_error = 1;
 567         status_message = "OK";
 568     }
 569     if (report  && !strcmp("status", report)) {
 570         report_status = 1;
 571         status_message = "OK";
 572     }
 573     if (!s)
 574         return;
 575
 576     active_clients = session_active_clients(s->psession);
 577     if (block && !strcmp("1", block) && active_clients)
 578     {
 579         // if there is already a watch/block. we do not block this one
 580         if (session_set_watch(s->psession, SESSION_WATCH_TERMLIST,
 581                               termlist_result_ready, c, c) != 0)
 582         {
 583             yaz_log(YLOG_WARN, "Session %u: Attempt to block multiple times on termlist block. Not supported!", s->session_id);
 584             if (report_error) {
 585                 error(rs, PAZPAR2_ALREADY_BLOCKED, "termlist");
 586                 release_session(c, s);
 587                 return;
 588             }
 589             if (report_status) {
 590                 status_message = "WARNING (Already blocked on termlist)";
 591             }
 592         }
 593         else
 594         {
 595             yaz_log(c->http_sessions->log_level, "Session %u: Blocking on command termlist", s->session_id);
 596             release_session(c, s);
 597             return;
 598         }
 599     }
 600
 601     termlist_response(c, s, status_message);
 602     release_session(c, s);
 603 }
 604
 605 size_t session_get_memory_status(struct session *session);
 606
 607 static void session_status(struct http_channel *c, struct http_session *s)
 608 {
 609     size_t session_nmem;
 610     wrbuf_printf(c->wrbuf, "<http_count>%u</http_count>\n", s->activity_counter);
 611     wrbuf_printf(c->wrbuf, "<http_nmem>%zu</http_nmem>\n", nmem_total(s->nmem) );
 612     session_nmem = session_get_memory_status(s->psession);
 613     wrbuf_printf(c->wrbuf, "<session_nmem>%zu</session_nmem>\n", session_nmem);
 614 }
 615
 616 static void cmd_session_status(struct http_channel *c)
 617 {
 618     struct http_session *s = locate_session(c);
 619     if (!s)
 620         return;
 621
 622     response_open(c, "session-status");
 623     session_status(c, s);
 624     response_close(c, "session-status");
 625     release_session(c, s);
 626 }
 627
 628 int sessions_count(void);
 629 int clients_count(void);
 630 #ifdef HAVE_RESULTSETS_COUNT
 631 int resultsets_count(void);
 632 #else
 633 #define resultsets_count()      0
 634 #endif
 635
 636 static void cmd_server_status(struct http_channel *c)
 637 {
 638     int sessions   = sessions_count();
 639     int clients    = clients_count();
 640     int resultsets = resultsets_count();
 641
 642     response_open(c, "server-status");
 643     wrbuf_printf(c->wrbuf, "\n  <sessions>%u</sessions>\n", sessions);
 644     wrbuf_printf(c->wrbuf, "  <clients>%u</clients>\n",   clients);
 645     /* Only works if yaz has been compiled with enabling of this */
 646     wrbuf_printf(c->wrbuf, "  <resultsets>%u</resultsets>\n",resultsets);
 647     print_meminfo(c->wrbuf);
 648
 649 /* TODO add all sessions status                         */
 650 /*    http_sessions_t http_sessions = c->http_sessions; */
 651 /*    struct http_session *p;                           */
 652 /*
 653     yaz_mutex_enter(http_sessions->mutex);
 654     for (p = http_sessions->session_list; p; p = p->next)
 655     {
 656         p->activity_counter++;
 657         wrbuf_puts(c->wrbuf, "<session-status>\n");
 658         wrbuf_printf(c->wrbuf, "<id>%s</id>\n", p->session_id);
 659         yaz_mutex_leave(http_sessions->mutex);
 660         session_status(c, p);
 661         wrbuf_puts(c->wrbuf, "</session-status>\n");
 662         yaz_mutex_enter(http_sessions->mutex);
 663         p->activity_counter--;
 664     }
 665     yaz_mutex_leave(http_sessions->mutex);
 666 */
 667     response_close(c, "server-status");
 668     xmalloc_trav(0);
 669 }
 670
 671 static void bytarget_response(struct http_channel *c, struct http_session *s, const char *cmd_status) {
 672     int count, i;
 673     struct hitsbytarget *ht;
 674     struct http_request *rq = c->request;
 675     const char *settings = http_argbyname(rq, "settings");
 676
 677     ht = get_hitsbytarget(s->psession, &count, c->nmem);
 678     if (!cmd_status)
 679         /* Old protocol, always ok */
 680         response_open(c, "bytarget");
 681     else {
 682         /* New protocol, OK or WARNING (...)*/
 683         response_open_no_status(c, "bytarget");
 684         wrbuf_printf(c->wrbuf, "<status>%s</status>", cmd_status);
 685     }
 686
 687     if (count == 0)
 688         yaz_log(YLOG_WARN, "Empty bytarget Response. No targets found!");
 689     for (i = 0; i < count; i++)
 690     {
 691         wrbuf_puts(c->wrbuf, "\n<target>");
 692
 693         wrbuf_puts(c->wrbuf, "<id>");
 694         wrbuf_xmlputs(c->wrbuf, ht[i].id);
 695         wrbuf_puts(c->wrbuf, "</id>\n");
 696
 697         if (ht[i].name && ht[i].name[0])
 698         {
 699             wrbuf_puts(c->wrbuf, "<name>");
 700             wrbuf_xmlputs(c->wrbuf, ht[i].name);
 701             wrbuf_puts(c->wrbuf, "</name>\n");
 702         }
 703
 704         wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", ht[i].hits);
 705         wrbuf_printf(c->wrbuf, "<diagnostic>%d</diagnostic>\n", ht[i].diagnostic);
 706         if (ht[i].diagnostic)
 707         {
 708             wrbuf_puts(c->wrbuf, "<addinfo>");
 709             if (ht[i].addinfo)
 710                 wrbuf_xmlputs(c->wrbuf, ht[i].addinfo);
 711             wrbuf_puts(c->wrbuf, "</addinfo>\n");
 712         }
 713
 714         wrbuf_printf(c->wrbuf, "<records>%d</records>\n", ht[i].records);
 715
 716         wrbuf_puts(c->wrbuf, "<state>");
 717         wrbuf_xmlputs(c->wrbuf, ht[i].state);
 718         wrbuf_puts(c->wrbuf, "</state>\n");
 719         if (settings && *settings == '1')
 720         {
 721             wrbuf_puts(c->wrbuf, "<settings>\n");
 722             wrbuf_puts(c->wrbuf, ht[i].settings_xml);
 723             wrbuf_puts(c->wrbuf, "</settings>\n");
 724         }
 725         if (ht[i].suggestions_xml && ht[i].suggestions_xml[0]) {
 726             wrbuf_puts(c->wrbuf, "<suggestions>");
 727             wrbuf_puts(c->wrbuf, ht[i].suggestions_xml);
 728             wrbuf_puts(c->wrbuf, "</suggestions>");
 729         }
 730         wrbuf_puts(c->wrbuf, "</target>");
 731     }
 732     response_close(c, "bytarget");
 733 }
 734
 735 static void bytarget_result_ready(void *data)
 736 {
 737     struct http_channel *c = (struct http_channel *) data;
 738     struct http_session *s = locate_session(c);
 739     const char *status_message = "OK";
 740     if (s) {
 741         yaz_log(c->http_sessions->log_level, "Session %u: bytarget watch released", s->session_id);
 742         bytarget_response(c, s, status_message);
 743         release_session(c, s);
 744     }
 745     else {
 746         yaz_log(c->http_sessions->log_level, "No Session found for released bytarget watch");
 747     }
 748 }
 749
 750
 751 static void cmd_bytarget(struct http_channel *c)
 752 {
 753     struct http_request *rq = c->request;
 754     struct http_response *rs = c->response;
 755     struct http_session *s = locate_session(c);
 756     const char *block = http_argbyname(rq, "block");
 757     const char *report = http_argbyname(rq, "report");
 758     int block_error = 0;
 759     int report_status = 0;
 760     const char *status_message = "OK";
 761     if (report && !strcmp("error", report)) {
 762         block_error = 1;
 763     }
 764     if (report && !strcmp("status", report)) {
 765         report_status = 1;
 766     }
 767
 768     int no_active;
 769
 770     if (!s)
 771         return;
 772
 773     no_active = session_active_clients(s->psession);
 774     if (block && !strcmp("1",block) && no_active)
 775     {
 776         // if there is already a watch/block. we do not block this one
 777         if (session_set_watch(s->psession, SESSION_WATCH_BYTARGET,
 778                               bytarget_result_ready, c, c) != 0)
 779         {
 780             yaz_log(YLOG_WARN, "Session %u: Attempt to block multiple times on bytarget block. Not supported!", s->session_id);
 781             if (block_error) {
 782                 error(rs, PAZPAR2_ALREADY_BLOCKED, "bytarget");
 783                 release_session(c, s);
 784                 return;
 785             }
 786             if (report_status) {
 787                 status_message = "WARNING (Already blocked on bytarget)";
 788             }
 789         }
 790         else
 791         {
 792             yaz_log(c->http_sessions->log_level, "Session %u: Blocking on command bytarget", s->session_id);
 793             release_session(c, s);
 794             return;
 795         }
 796     }
 797     bytarget_response(c, s, status_message);
 798     release_session(c, s);
 799 }
 800
 801 static void write_metadata(WRBUF w, struct conf_service *service,
 802         struct record_metadata **ml, int full)
 803 {
 804     int imeta;
 805
 806     for (imeta = 0; imeta < service->num_metadata; imeta++)
 807     {
 808         struct conf_metadata *cmd = &service->metadata[imeta];
 809         struct record_metadata *md;
 810         if (!cmd->brief && !full)
 811             continue;
 812         for (md = ml[imeta]; md; md = md->next)
 813         {
 814             struct record_metadata_attr *attr = md->attributes;
 815             wrbuf_printf(w, "\n<md-%s", cmd->name);
 816
 817             for (; attr; attr = attr->next)
 818             {
 819                 wrbuf_printf(w, " %s=\"", attr->name);
 820                 wrbuf_xmlputs(w, attr->value);
 821                 wrbuf_puts(w, "\"");
 822             }
 823             wrbuf_puts(w, ">");
 824             switch (cmd->type)
 825             {
 826                 case Metadata_type_generic:
 827                     wrbuf_xmlputs(w, md->data.text.disp);
 828                     break;
 829                 case Metadata_type_year:
 830                     wrbuf_printf(w, "%d", md->data.number.min);
 831                     if (md->data.number.min != md->data.number.max)
 832                         wrbuf_printf(w, "-%d", md->data.number.max);
 833                     break;
 834                 default:
 835                     wrbuf_puts(w, "[can't represent]");
 836                     break;
 837             }
 838             wrbuf_printf(w, "</md-%s>", cmd->name);
 839         }
 840     }
 841 }
 842
 843 static void write_subrecord(struct record *r, WRBUF w,
 844         struct conf_service *service, int show_details)
 845 {
 846     const char *name = session_setting_oneval(
 847         client_get_database(r->client), PZ_NAME);
 848
 849     wrbuf_puts(w, "<location id=\"");
 850     wrbuf_xmlputs(w, client_get_id(r->client));
 851     wrbuf_puts(w, "\" ");
 852
 853     wrbuf_puts(w, "name=\"");
 854     wrbuf_xmlputs(w,  *name ? name : "Unknown");
 855     wrbuf_puts(w, "\">");
 856
 857     write_metadata(w, service, r->metadata, show_details);
 858     wrbuf_puts(w, "</location>\n");
 859 }
 860
 861 static void show_raw_record_error(void *data, const char *addinfo)
 862 {
 863     http_channel_observer_t obs = data;
 864     struct http_channel *c = http_channel_observer_chan(obs);
 865     struct http_response *rs = c->response;
 866
 867     http_remove_observer(obs);
 868
 869     error(rs, PAZPAR2_RECORD_FAIL, addinfo);
 870 }
 871
 872 static void show_raw_record_ok(void *data, const char *buf, size_t sz)
 873 {
 874     http_channel_observer_t obs = data;
 875     struct http_channel *c = http_channel_observer_chan(obs);
 876     struct http_response *rs = c->response;
 877
 878     http_remove_observer(obs);
 879
 880     wrbuf_write(c->wrbuf, buf, sz);
 881     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 882     http_send_response(c);
 883 }
 884
 885
 886 static void show_raw_record_ok_binary(void *data, const char *buf, size_t sz)
 887 {
 888     http_channel_observer_t obs = data;
 889     struct http_channel *c = http_channel_observer_chan(obs);
 890     struct http_response *rs = c->response;
 891
 892     http_remove_observer(obs);
 893
 894     wrbuf_write(c->wrbuf, buf, sz);
 895     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 896
 897     rs->content_type = "application/octet-stream";
 898     http_send_response(c);
 899 }
 900
 901
 902 void show_raw_reset(void *data, struct http_channel *c, void *data2)
 903 {
 904     //struct client *client = data;
 905     //client_show_raw_remove(client, data2);
 906 }
 907
 908 static void cmd_record_ready(void *data);
 909
 910 static void show_record(struct http_channel *c, struct http_session *s)
 911 {
 912     struct http_response *rs = c->response;
 913     struct http_request *rq = c->request;
 914     struct record_cluster *rec, *prev_r, *next_r;
 915     struct record *r;
 916     struct conf_service *service;
 917     const char *idstr = http_argbyname(rq, "id");
 918     const char *offsetstr = http_argbyname(rq, "offset");
 919     const char *binarystr = http_argbyname(rq, "binary");
 920
 921     if (!s)
 922         return;
 923     service = s->psession->service;
 924     if (!idstr)
 925     {
 926         error(rs, PAZPAR2_MISSING_PARAMETER, "id");
 927         return;
 928     }
 929     wrbuf_rewind(c->wrbuf);
 930     if (!(rec = show_single_start(s->psession, idstr, &prev_r, &next_r)))
 931     {
 932         if (session_active_clients(s->psession) == 0)
 933         {
 934             error(rs, PAZPAR2_RECORD_MISSING, idstr);
 935         }
 936         else if (session_set_watch(s->psession, SESSION_WATCH_RECORD,
 937                               cmd_record_ready, c, c) != 0)
 938         {
 939             error(rs, PAZPAR2_RECORD_MISSING, idstr);
 940         }
 941         return;
 942     }
 943     if (offsetstr)
 944     {
 945         int offset = atoi(offsetstr);
 946         const char *syntax = http_argbyname(rq, "syntax");
 947         const char *esn = http_argbyname(rq, "esn");
 948         int i;
 949         struct record*r = rec->records;
 950         int binary = 0;
 951         const char *nativesyntax = http_argbyname(rq, "nativesyntax");
 952
 953         if (binarystr && *binarystr != '0')
 954             binary = 1;
 955
 956         for (i = 0; i < offset && r; r = r->next, i++)
 957             ;
 958         if (!r)
 959         {
 960             error(rs, PAZPAR2_RECORD_FAIL, "no record at offset given");
 961         }
 962         else
 963         {
 964             http_channel_observer_t obs =
 965                 http_add_observer(c, r->client, show_raw_reset);
 966             int ret = client_show_raw_begin(r->client, r->position,
 967                                             syntax, esn,
 968                                             obs /* data */,
 969                                             show_raw_record_error,
 970                                             (binary ?
 971                                              show_raw_record_ok_binary :
 972                                              show_raw_record_ok),
 973                                             (binary ? 1 : 0),
 974                                             nativesyntax);
 975             if (ret == -1)
 976             {
 977                 http_remove_observer(obs);
 978                 error(rs, PAZPAR2_NO_SESSION, 0);
 979             }
 980         }
 981     }
 982     else
 983     {
 984         response_open_no_status(c, "record");
 985         wrbuf_puts(c->wrbuf, "\n<recid>");
 986         wrbuf_xmlputs(c->wrbuf, rec->recid);
 987         wrbuf_puts(c->wrbuf, "</recid>\n");
 988         if (prev_r)
 989         {
 990             wrbuf_puts(c->wrbuf, "<prevrecid>");
 991             wrbuf_xmlputs(c->wrbuf, prev_r->recid);
 992             wrbuf_puts(c->wrbuf, "</prevrecid>\n");
 993         }
 994         if (next_r)
 995         {
 996             wrbuf_puts(c->wrbuf, "<nextrecid>");
 997             wrbuf_xmlputs(c->wrbuf, next_r->recid);
 998             wrbuf_puts(c->wrbuf, "</nextrecid>\n");
 999         }
1000         wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n",
1001                      session_active_clients(s->psession));
1002         write_metadata(c->wrbuf, service, rec->metadata, 1);
1003         for (r = rec->records; r; r = r->next)
1004             write_subrecord(r, c->wrbuf, service, 1);
1005         response_close(c, "record");
1006     }
1007     show_single_stop(s->psession, rec);
1008 }
1009
1010 static void cmd_record_ready(void *data)
1011 {
1012     struct http_channel *c = (struct http_channel *) data;
1013     struct http_session *s = locate_session(c);
1014     if (s) {
1015         yaz_log(c->http_sessions->log_level, "Session %u: record watch released", s->session_id);
1016         show_record(c, s);
1017         release_session(c,s);
1018     }
1019 }
1020
1021 static void cmd_record(struct http_channel *c)
1022 {
1023     struct http_session *s = locate_session(c);
1024     if (s) {
1025         show_record(c, s);
1026         release_session(c,s);
1027     }
1028 }
1029
1030
1031 static void show_records(struct http_channel *c, struct http_session *s, int active)
1032 {
1033     struct http_request *rq = c->request;
1034     struct http_response *rs = c->response;
1035     struct record_cluster **rl;
1036     struct reclist_sortparms *sp;
1037     const char *start = http_argbyname(rq, "start");
1038     const char *num = http_argbyname(rq, "num");
1039     const char *sort = http_argbyname(rq, "sort");
1040     int startn = 0;
1041     int numn = 20;
1042     int total;
1043     Odr_int total_hits;
1044     int i;
1045
1046     if (!s)
1047         return;
1048
1049     // We haven't counted clients yet if we're called on a block release
1050     if (active < 0)
1051         active = session_active_clients(s->psession);
1052
1053     if (start)
1054         startn = atoi(start);
1055     if (num)
1056         numn = atoi(num);
1057     if (!sort)
1058         sort = "relevance";
1059     if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
1060     {
1061         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1062         return;
1063
1064     }
1065
1066     rl = show_range_start(s->psession, sp, startn, &numn, &total, &total_hits);
1067
1068     response_open(c, "show");
1069     wrbuf_printf(c->wrbuf, "\n<activeclients>%d</activeclients>\n", active);
1070     wrbuf_printf(c->wrbuf, "<merged>%d</merged>\n", total);
1071     wrbuf_printf(c->wrbuf, "<total>" ODR_INT_PRINTF "</total>\n", total_hits);
1072     wrbuf_printf(c->wrbuf, "<start>%d</start>\n", startn);
1073     wrbuf_printf(c->wrbuf, "<num>%d</num>\n", numn);
1074
1075     for (i = 0; i < numn; i++)
1076     {
1077         int ccount;
1078         struct record *p;
1079         struct record_cluster *rec = rl[i];
1080         struct conf_service *service = s->psession->service;
1081
1082         wrbuf_puts(c->wrbuf, "<hit>\n");
1083         write_metadata(c->wrbuf, service, rec->metadata, 0);
1084         for (ccount = 0, p = rl[i]->records; p;  p = p->next, ccount++)
1085             write_subrecord(p, c->wrbuf, service, 0); // subrecs w/o details
1086         if (ccount > 1)
1087             wrbuf_printf(c->wrbuf, "<count>%d</count>\n", ccount);
1088         if (strstr(sort, "relevance"))
1089             wrbuf_printf(c->wrbuf, "<relevance>%d</relevance>\n",
1090                          rec->relevance_score);
1091         wrbuf_puts(c->wrbuf, "<recid>");
1092         wrbuf_xmlputs(c->wrbuf, rec->recid);
1093         wrbuf_puts(c->wrbuf, "</recid>\n");
1094         wrbuf_puts(c->wrbuf, "</hit>\n");
1095     }
1096
1097     show_range_stop(s->psession, rl);
1098
1099     response_close(c, "show");
1100 }
1101
1102 static void show_records_ready(void *data)
1103 {
1104     struct http_channel *c = (struct http_channel *) data;
1105     struct http_session *s = locate_session(c);
1106     if (s) {
1107         yaz_log(c->http_sessions->log_level, "Session %u: show watch released", s->session_id);
1108         show_records(c, s, -1);
1109     }
1110     else {
1111         /* some error message  */
1112     }
1113     release_session(c,s);
1114 }
1115
1116 static void cmd_show(struct http_channel *c)
1117 {
1118     struct http_request  *rq = c->request;
1119     struct http_response *rs = c->response;
1120     struct http_session *s = locate_session(c);
1121     const char *block = http_argbyname(rq, "block");
1122     const char *sort = http_argbyname(rq, "sort");
1123     const char *block_error = http_argbyname(rq, "error");
1124     struct reclist_sortparms *sp;
1125     int status;
1126
1127     if (!s)
1128         return;
1129
1130     if (!sort)
1131         sort = "relevance";
1132
1133     if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
1134     {
1135         error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1136         release_session(c, s);
1137         return;
1138     }
1139     session_sort(s->psession, sp->name, sp->increasing);
1140
1141     status = session_active_clients(s->psession);
1142
1143     if (block)
1144     {
1145         if (!strcmp(block, "preferred") && !session_is_preferred_clients_ready(s->psession) && reclist_get_num_records(s->psession->reclist) == 0)
1146         {
1147             // if there is already a watch/block. we do not block this one
1148             if (session_set_watch(s->psession, SESSION_WATCH_SHOW_PREF,
1149                                   show_records_ready, c, c) == 0)
1150             {
1151                 yaz_log(c->http_sessions->log_level,
1152                         "Session %u: Blocking on command show (preferred targets)", s->session_id);
1153                 release_session(c, s);
1154                 return;
1155             }
1156             else
1157             {
1158                 yaz_log(YLOG_WARN, "Attempt to block multiple times on show (preferred targets) block. Not supported!");
1159                 if (block_error && !strcmp("1", block_error)) {
1160                     error(rs, PAZPAR2_ALREADY_BLOCKED, "show (preferred targets)");
1161                     release_session(c, s);
1162                     return;
1163                 }
1164             }
1165
1166         }
1167         else if (status)
1168         {
1169             // if there is already a watch/block. we do not block this one
1170             if (session_set_watch(s->psession, SESSION_WATCH_SHOW,
1171                                   show_records_ready, c, c) != 0)
1172             {
1173                 yaz_log(YLOG_WARN, "Attempt to block multiple times on show block. Not supported!");
1174                 if (block_error && !strcmp("1", block_error)) {
1175                     error(rs, PAZPAR2_ALREADY_BLOCKED, "show");
1176                     release_session(c, s);
1177                     return;
1178                 }
1179             }
1180             else
1181             {
1182                 yaz_log(c->http_sessions->log_level, "Session %u: Blocking on command show", s->session_id);
1183                 release_session(c, s);
1184                 return;
1185             }
1186         }
1187     }
1188     show_records(c, s, status);
1189     release_session(c, s);
1190 }
1191
1192 static void cmd_ping(struct http_channel *c)
1193 {
1194     struct http_session *s = locate_session(c);
1195     if (!s)
1196         return;
1197     response_open(c, "ping");
1198     response_close(c, "ping");
1199     release_session(c, s);
1200 }
1201
1202 static void cmd_search(struct http_channel *c)
1203 {
1204     struct http_request *rq = c->request;
1205     struct http_response *rs = c->response;
1206     struct http_session *s = locate_session(c);
1207     const char *query = http_argbyname(rq, "query");
1208     const char *filter = http_argbyname(rq, "filter");
1209     const char *maxrecs = http_argbyname(rq, "maxrecs");
1210     const char *startrecs = http_argbyname(rq, "startrecs");
1211     const char *limit = http_argbyname(rq, "limit");
1212     enum pazpar2_error_code code;
1213     const char *addinfo = 0;
1214
1215     if (!s)
1216         return;
1217     if (!query)
1218     {
1219         error(rs, PAZPAR2_MISSING_PARAMETER, "query");
1220         release_session(c, s);
1221         return;
1222     }
1223     if (!yaz_utf8_check(query))
1224     {
1225         error(rs, PAZPAR2_MALFORMED_PARAMETER_ENCODING, "query");
1226         release_session(c, s);
1227         return;
1228     }
1229     code = session_search(s->psession, query, startrecs, maxrecs, filter, limit,
1230                           &addinfo, "relevance", 0);
1231     if (code)
1232     {
1233         error(rs, code, addinfo);
1234         release_session(c, s);
1235         return;
1236     }
1237     response_open(c, "search");
1238     response_close(c, "search");
1239     release_session(c, s);
1240 }
1241
1242
1243 static void cmd_stat(struct http_channel *c)
1244 {
1245     struct http_session *s = locate_session(c);
1246     struct statistics stat;
1247     int clients;
1248
1249     float progress = 0;
1250
1251     if (!s)
1252         return;
1253
1254     clients = session_active_clients(s->psession);
1255     statistics(s->psession, &stat);
1256
1257     if (stat.num_clients > 0)
1258     {
1259         progress = (stat.num_clients  - clients) / (float)stat.num_clients;
1260     }
1261
1262     response_open_no_status(c, "stat");
1263     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", clients);
1264     wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", stat.num_hits);
1265     wrbuf_printf(c->wrbuf, "<records>%d</records>\n", stat.num_records);
1266     wrbuf_printf(c->wrbuf, "<clients>%d</clients>\n", stat.num_clients);
1267     wrbuf_printf(c->wrbuf, "<unconnected>%d</unconnected>\n", stat.num_no_connection);
1268     wrbuf_printf(c->wrbuf, "<connecting>%d</connecting>\n", stat.num_connecting);
1269     wrbuf_printf(c->wrbuf, "<working>%d</working>\n", stat.num_working);
1270     wrbuf_printf(c->wrbuf, "<idle>%d</idle>\n", stat.num_idle);
1271     wrbuf_printf(c->wrbuf, "<failed>%d</failed>\n", stat.num_failed);
1272     wrbuf_printf(c->wrbuf, "<error>%d</error>\n", stat.num_error);
1273     wrbuf_printf(c->wrbuf, "<progress>%.2f</progress>\n", progress);
1274     response_close(c, "stat");
1275     release_session(c, s);
1276 }
1277
1278 static void cmd_info(struct http_channel *c)
1279 {
1280     char yaz_version_str[20];
1281
1282     response_open_no_status(c, "info");
1283     wrbuf_puts(c->wrbuf, " <version>\n");
1284     wrbuf_puts(c->wrbuf, "  <pazpar2");
1285 #ifdef PAZPAR2_VERSION_SHA1
1286     wrbuf_printf(c->wrbuf, " sha1=\"%s\"", PAZPAR2_VERSION_SHA1);
1287 #endif
1288     wrbuf_puts(c->wrbuf, ">");
1289     wrbuf_xmlputs(c->wrbuf, VERSION);
1290     wrbuf_puts(c->wrbuf, "</pazpar2>");
1291
1292     yaz_version(yaz_version_str, 0);
1293     wrbuf_puts(c->wrbuf, "  <yaz compiled=\"");
1294     wrbuf_xmlputs(c->wrbuf, YAZ_VERSION);
1295     wrbuf_puts(c->wrbuf, "\">");
1296     wrbuf_xmlputs(c->wrbuf, yaz_version_str);
1297     wrbuf_puts(c->wrbuf, "</yaz>\n");
1298
1299     wrbuf_puts(c->wrbuf, " </version>\n");
1300
1301     info_services(c->server, c->wrbuf);
1302
1303     response_close(c, "info");
1304 }
1305
1306 struct {
1307     char *name;
1308     void (*fun)(struct http_channel *c);
1309 } commands[] = {
1310     { "init", cmd_init },
1311     { "settings", cmd_settings },
1312     { "stat", cmd_stat },
1313     { "bytarget", cmd_bytarget },
1314     { "show", cmd_show },
1315     { "search", cmd_search },
1316     { "termlist", cmd_termlist },
1317     { "exit", cmd_exit },
1318     { "session-status", cmd_session_status },
1319     { "server-status", cmd_server_status },
1320     { "ping", cmd_ping },
1321     { "record", cmd_record },
1322     { "info", cmd_info },
1323     {0,0}
1324 };
1325
1326 void http_command(struct http_channel *c)
1327 {
1328     const char *command = http_argbyname(c->request, "command");
1329     struct http_response *rs = http_create_response(c);
1330     int i;
1331
1332     c->response = rs;
1333
1334     http_addheader(rs, "Expires", "Thu, 19 Nov 1981 08:52:00 GMT");
1335     http_addheader(rs, "Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
1336
1337     if (!command)
1338     {
1339         error(rs, PAZPAR2_MISSING_PARAMETER, "command");
1340         return;
1341     }
1342     for (i = 0; commands[i].name; i++)
1343         if (!strcmp(commands[i].name, command))
1344         {
1345             (*commands[i].fun)(c);
1346             break;
1347         }
1348     if (!commands[i].name)
1349         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "command");
1350
1351     return;
1352 }
1353
1354 /*
1355  * Local variables:
1356  * c-basic-offset: 4
1357  * c-file-style: "Stroustrup"
1358  * indent-tabs-mode: nil
1359  * End:
1360  * vim: shiftwidth=4 tabstop=8 expandtab
1361  */
1362