src/http_command.c

   1 /* This file is part of Pazpar2.
   2    Copyright (C) 2006-2013 Index Data
   3
   4 Pazpar2 is free software; you can redistribute it and/or modify it under
   5 the terms of the GNU General Public License as published by the Free
   6 Software Foundation; either version 2, or (at your option) any later
   7 version.
   8
   9 Pazpar2 is distributed in the hope that it will be useful, but WITHOUT ANY
  10 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17
  18 */
  19
  20 #if HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23 #include <stdio.h>
  24 #include <sys/types.h>
  25 #if HAVE_UNISTD_H
  26 #include <unistd.h>
  27 #endif
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #if HAVE_SYS_TIME_H
  31 #include <sys/time.h>
  32 #endif
  33 #include <yaz/snprintf.h>
  34 #include <yaz/yaz-util.h>
  35
  36 #include "ppmutex.h"
  37 #include "eventl.h"
  38 #include "parameters.h"
  39 #include "session.h"
  40 #include "http.h"
  41 #include "settings.h"
  42 #include "client.h"
  43
  44 #ifdef HAVE_MALLINFO
  45 #include <malloc.h>
  46
  47 void print_meminfo(WRBUF wrbuf)
  48 {
  49     struct mallinfo minfo;
  50     minfo = mallinfo();
  51     wrbuf_printf(wrbuf, "  <memory>\n"
  52                         "   <arena>%d</arena>\n"
  53                         "   <uordblks>%d</uordblks>\n"
  54                         "   <fordblks>%d</fordblks>\n"
  55                         "   <ordblks>%d</ordblks>\n"
  56                         "   <keepcost>%d</keepcost>\n"
  57                         "   <hblks>%d</hblks>\n"
  58                         "   <hblkhd>%d</hblkhd>\n"
  59                         "   <virt>%d</virt>\n"
  60                         "   <virtuse>%d</virtuse>\n"
  61                         "  </memory>\n",
  62                  minfo.arena, minfo.uordblks, minfo.fordblks,minfo.ordblks, minfo.keepcost, minfo.hblks, minfo.hblkhd, minfo.arena + minfo.hblkhd, minfo.uordblks + minfo.hblkhd);
  63
  64 }
  65 #else
  66 #define print_meminfo(x)
  67 #endif
  68
  69
  70 // Update this when the protocol changes
  71 #define PAZPAR2_PROTOCOL_VERSION "1"
  72
  73 #define HTTP_COMMAND_RESPONSE_PREFIX "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
  74
  75 struct http_session {
  76     IOCHAN timeout_iochan;     // NOTE: This is NOT associated with a socket
  77     struct session *psession;
  78     unsigned int session_id;
  79     int timestamp;
  80     int destroy_counter;
  81     int activity_counter;
  82     NMEM nmem;
  83     http_sessions_t http_sessions;
  84     struct http_session *next;
  85 };
  86
  87 struct http_sessions {
  88     struct http_session *session_list;
  89     YAZ_MUTEX mutex;
  90     int log_level;
  91 };
  92
  93 static YAZ_MUTEX g_http_session_mutex = 0;
  94 static int g_http_sessions = 0;
  95
  96 static void show_records_ready(void *data);
  97
  98 int get_version(struct http_request *rq) {
  99     const char *version = http_argbyname(rq, "version");
 100     int version_no = 0;
 101     if (version && strcmp(version, "")) {
 102         version_no = atoi(version);
 103     }
 104     return version_no;
 105 }
 106
 107
 108 int http_session_use(int delta)
 109 {
 110     int sessions;
 111     if (!g_http_session_mutex)
 112         yaz_mutex_create(&g_http_session_mutex);
 113     yaz_mutex_enter(g_http_session_mutex);
 114     g_http_sessions += delta;
 115     sessions = g_http_sessions;
 116     yaz_mutex_leave(g_http_session_mutex);
 117     yaz_log(YLOG_DEBUG, "%s http_sessions=%d", delta == 0 ? "" :
 118             (delta > 0 ? "INC" : "DEC"), sessions);
 119     return sessions;
 120
 121 }
 122
 123 http_sessions_t http_sessions_create(void)
 124 {
 125     http_sessions_t hs = xmalloc(sizeof(*hs));
 126     hs->session_list = 0;
 127     hs->mutex = 0;
 128     pazpar2_mutex_create(&hs->mutex, "http_sessions");
 129     hs->log_level = yaz_log_module_level("HTTP");
 130     return hs;
 131 }
 132
 133 void http_sessions_destroy(http_sessions_t hs)
 134 {
 135     if (hs)
 136     {
 137         struct http_session *s = hs->session_list;
 138         while (s)
 139         {
 140             struct http_session *s_next = s->next;
 141             iochan_destroy(s->timeout_iochan);
 142             session_destroy(s->psession);
 143             nmem_destroy(s->nmem);
 144             s = s_next;
 145         }
 146         yaz_mutex_destroy(&hs->mutex);
 147         xfree(hs);
 148     }
 149 }
 150
 151 void http_session_destroy(struct http_session *s);
 152
 153 static void session_timeout(IOCHAN i, int event)
 154 {
 155     struct http_session *s = iochan_getdata(i);
 156     http_session_destroy(s);
 157 }
 158
 159 struct http_session *http_session_create(struct conf_service *service,
 160                                          http_sessions_t http_sessions,
 161                                          unsigned int sesid)
 162 {
 163     NMEM nmem = nmem_create();
 164     struct http_session *r = nmem_malloc(nmem, sizeof(*r));
 165     char tmp_str[50];
 166
 167     sprintf(tmp_str, "session#%u", sesid);
 168     r->psession = new_session(nmem, service, sesid);
 169     r->session_id = sesid;
 170     r->timestamp = 0;
 171     r->nmem = nmem;
 172     r->destroy_counter = r->activity_counter = 0;
 173     r->http_sessions = http_sessions;
 174
 175     yaz_mutex_enter(http_sessions->mutex);
 176     r->next = http_sessions->session_list;
 177     http_sessions->session_list = r;
 178     yaz_mutex_leave(http_sessions->mutex);
 179
 180     r->timeout_iochan = iochan_create(-1, session_timeout, 0,
 181                                       "http_session_timeout");
 182     iochan_setdata(r->timeout_iochan, r);
 183
 184     session_log(r->psession, http_sessions->log_level,
 185                 "HTTP session create. timeout chan=%p ses=%d",
 186                 r->timeout_iochan, service->session_timeout);
 187     iochan_settimeout(r->timeout_iochan, service->session_timeout);
 188
 189     iochan_add(service->server->iochan_man, r->timeout_iochan);
 190     http_session_use(1);
 191     return r;
 192 }
 193
 194 void http_session_destroy(struct http_session *s)
 195 {
 196     int must_destroy = 0;
 197
 198     http_sessions_t http_sessions = s->http_sessions;
 199
 200     session_log(s->psession, http_sessions->log_level,
 201                 "HTTP session destroy");
 202     yaz_mutex_enter(http_sessions->mutex);
 203     /* only if http_session has no active http sessions on it can be destroyed */
 204     if (s->destroy_counter == s->activity_counter)
 205     {
 206         struct http_session **p = 0;
 207         must_destroy = 1;
 208         for (p = &http_sessions->session_list; *p; p = &(*p)->next)
 209             if (*p == s)
 210             {
 211                 *p = (*p)->next;
 212                 break;
 213             }
 214     }
 215     yaz_mutex_leave(http_sessions->mutex);
 216     if (must_destroy)
 217     {   /* destroying for real */
 218         session_log(s->psession, http_sessions->log_level, "About to destroyd");
 219         iochan_destroy(s->timeout_iochan);
 220         session_destroy(s->psession);
 221         http_session_use(-1);
 222         nmem_destroy(s->nmem);
 223     }
 224     else
 225     {
 226         session_log(s->psession, http_sessions->log_level,
 227                     "Destroy delayed. Active clients (%d-%d)",
 228                     s->activity_counter, s->destroy_counter);
 229     }
 230
 231 }
 232
 233 static const char *get_msg(enum pazpar2_error_code code)
 234 {
 235     struct pazpar2_error_msg {
 236         enum pazpar2_error_code code;
 237         const char *msg;
 238     };
 239     static const struct pazpar2_error_msg ar[] = {
 240         { PAZPAR2_NO_SESSION, "Session does not exist or it has expired"},
 241         { PAZPAR2_MISSING_PARAMETER, "Missing parameter"},
 242         { PAZPAR2_MALFORMED_PARAMETER_VALUE, "Malformed parameter value"},
 243         { PAZPAR2_MALFORMED_PARAMETER_ENCODING, "Malformed parameter encoding"},
 244         { PAZPAR2_MALFORMED_SETTING, "Malformed setting argument"},
 245         { PAZPAR2_HITCOUNTS_FAILED, "Failed to retrieve hitcounts"},
 246         { PAZPAR2_RECORD_MISSING, "Record missing"},
 247         { PAZPAR2_NO_TARGETS, "No targets"},
 248         { PAZPAR2_CONFIG_TARGET, "Target cannot be configured"},
 249         { PAZPAR2_RECORD_FAIL, "Record command failed"},
 250         { PAZPAR2_NOT_IMPLEMENTED, "Not implemented"},
 251         { PAZPAR2_NO_SERVICE, "No service"},
 252         { PAZPAR2_ALREADY_BLOCKED, "Already blocked in session on: "},
 253         { PAZPAR2_LAST_ERROR, "Last error"},
 254         { 0, 0 }
 255     };
 256     int i = 0;
 257     while (ar[i].msg)
 258     {
 259         if (code == ar[i].code)
 260             return ar[i].msg;
 261         i++;
 262     }
 263     return "No error";
 264 }
 265
 266 static void error(struct http_response *rs,
 267                   enum pazpar2_error_code code,
 268                   const char *addinfo)
 269 {
 270     struct http_channel *c = rs->channel;
 271     WRBUF text = wrbuf_alloc();
 272     const char *http_status = "417";
 273     const char *msg = get_msg(code);
 274
 275     rs->msg = nmem_strdup(c->nmem, msg);
 276     strcpy(rs->code, http_status);
 277
 278     wrbuf_printf(text, HTTP_COMMAND_RESPONSE_PREFIX
 279                  "<error code=\"%d\" msg=\"%s\">", (int) code, msg);
 280     if (addinfo)
 281         wrbuf_xmlputs(text, addinfo);
 282     wrbuf_puts(text, "</error>");
 283
 284     yaz_log(YLOG_WARN, "HTTP %s %s%s%s", http_status,
 285             msg, addinfo ? ": " : "" , addinfo ? addinfo : "");
 286     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(text));
 287     wrbuf_destroy(text);
 288     http_send_response(c);
 289 }
 290
 291 static void response_open_command(struct http_channel *c, const char *command)
 292 {
 293     wrbuf_rewind(c->wrbuf);
 294     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX);
 295     if (command)
 296         wrbuf_printf(c->wrbuf, "<%s>", command);
 297 }
 298
 299 static void response_open_ok(struct http_channel *c, const char *command)
 300 {
 301     response_open_command(c, command);
 302     wrbuf_puts(c->wrbuf, "<status>OK</status>");
 303 }
 304
 305 static void response_close(struct http_channel *c, const char *command)
 306 {
 307     struct http_response *rs = c->response;
 308
 309     if (command)
 310         wrbuf_printf(c->wrbuf, "</%s>", command);
 311     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 312     http_send_response(c);
 313 }
 314
 315 unsigned int make_sessionid(void)
 316 {
 317     static int seq = 0; /* thread pr */
 318     unsigned int res;
 319
 320     seq++;
 321     if (global_parameters.predictable_sessions)
 322         res = seq;
 323     else
 324     {
 325 #ifdef WIN32
 326         res = seq;
 327 #else
 328         struct timeval t;
 329
 330         if (gettimeofday(&t, 0) < 0)
 331         {
 332             yaz_log(YLOG_WARN|YLOG_ERRNO, "gettimeofday");
 333             exit(1);
 334         }
 335         /* at most 256 sessions per second ..
 336            (long long would be more appropriate)*/
 337         res = t.tv_sec;
 338         res = ((res << 8) | (seq & 0xff)) & ((1U << 31) - 1);
 339 #endif
 340     }
 341     return res;
 342 }
 343
 344 static struct http_session *locate_session(struct http_channel *c)
 345 {
 346     struct http_request *rq = c->request;
 347     struct http_response *rs = c->response;
 348     struct http_session *p;
 349     const char *session = http_argbyname(rq, "session");
 350     http_sessions_t http_sessions = c->http_sessions;
 351     unsigned int id;
 352
 353     if (!session)
 354     {
 355         error(rs, PAZPAR2_MISSING_PARAMETER, "session");
 356         return 0;
 357     }
 358     id = atoi(session);
 359     yaz_mutex_enter(http_sessions->mutex);
 360     for (p = http_sessions->session_list; p; p = p->next)
 361         if (id == p->session_id)
 362             break;
 363     if (p)
 364         p->activity_counter++;
 365     yaz_mutex_leave(http_sessions->mutex);
 366     if (p)
 367         iochan_activity(p->timeout_iochan);
 368     else
 369         error(rs, PAZPAR2_NO_SESSION, session);
 370     return p;
 371 }
 372
 373 // Call after use of locate_session, in order to increment the destroy_counter
 374 static void release_session(struct http_channel *c,
 375                             struct http_session *session)
 376 {
 377     http_sessions_t http_sessions = c->http_sessions;
 378     yaz_mutex_enter(http_sessions->mutex);
 379     if (session)
 380         session->destroy_counter++;
 381     yaz_mutex_leave(http_sessions->mutex);
 382 }
 383
 384 // Decode settings parameters and apply to session
 385 // Syntax: setting[target]=value
 386 static int process_settings(struct session *se, struct http_request *rq,
 387                             struct http_response *rs)
 388 {
 389     struct http_argument *a;
 390
 391     for (a = rq->arguments; a; a = a->next)
 392         if (strchr(a->name, '['))
 393         {
 394             char **res;
 395             int num;
 396             char *dbname;
 397             char *setting;
 398
 399             // Nmem_strsplit *rules*!!!
 400             nmem_strsplit(se->session_nmem, "[]", a->name, &res, &num);
 401             if (num != 2)
 402             {
 403                 error(rs, PAZPAR2_MALFORMED_SETTING, a->name);
 404                 return -1;
 405             }
 406             setting = res[0];
 407             dbname = res[1];
 408             session_apply_setting(se, dbname, setting,
 409                     nmem_strdup(se->session_nmem, a->value));
 410         }
 411     return 0;
 412 }
 413
 414 static void cmd_exit(struct http_channel *c)
 415 {
 416     yaz_log(YLOG_WARN, "exit");
 417
 418     response_open_ok(c, "exit");
 419     response_close(c, "exit");
 420     if (global_parameters.debug_mode)
 421         http_close_server(c->server);
 422 }
 423
 424 static void cmd_init(struct http_channel *c)
 425 {
 426     struct http_request *r = c->request;
 427     const char *clear = http_argbyname(r, "clear");
 428     const char *content_type = http_lookup_header(r->headers, "Content-Type");
 429     unsigned int sesid;
 430     struct http_session *s;
 431     struct http_response *rs = c->response;
 432     struct conf_service *service = 0; /* no service (yet) */
 433
 434     if (r->content_len && content_type &&
 435         !yaz_strcmp_del("text/xml", content_type, "; "))
 436     {
 437         xmlDoc *doc = xmlParseMemory(r->content_buf, r->content_len);
 438         xmlNode *root_n;
 439         if (!doc)
 440         {
 441             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 442             return;
 443         }
 444         root_n = xmlDocGetRootElement(doc);
 445         service = service_create(c->server, root_n);
 446         xmlFreeDoc(doc);
 447         if (!service)
 448         {
 449             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 450             return;
 451         }
 452     }
 453
 454     if (!service)
 455     {
 456         const char *service_name = http_argbyname(c->request, "service");
 457         service = locate_service(c->server, service_name);
 458         if (!service)
 459         {
 460             error(rs, PAZPAR2_NO_SERVICE, service_name ? service_name : "unnamed");
 461             return;
 462         }
 463     }
 464     sesid = make_sessionid();
 465     s = http_session_create(service, c->http_sessions, sesid);
 466
 467     if (!clear || *clear == '0')
 468         session_init_databases(s->psession);
 469     else
 470         session_log(s->psession, YLOG_LOG, "No databases preloaded");
 471
 472     if (process_settings(s->psession, c->request, c->response) < 0)
 473         return;
 474
 475     response_open_ok(c, "init");
 476     wrbuf_printf(c->wrbuf, "<session>%d", sesid);
 477     if (c->server->server_id)
 478     {
 479         wrbuf_puts(c->wrbuf, ".");
 480         wrbuf_puts(c->wrbuf, c->server->server_id);
 481     }
 482     wrbuf_puts(c->wrbuf, "</session>"
 483                "<protocol>" PAZPAR2_PROTOCOL_VERSION "</protocol>");
 484
 485     wrbuf_printf(c->wrbuf, "<keepAlive>%d</keepAlive>\n",
 486                  1000 * ((s->psession->service->session_timeout >= 20) ?
 487                          (s->psession->service->session_timeout - 10) : 50));
 488     response_close(c, "init");
 489 }
 490
 491 static void apply_local_setting(void *client_data,
 492                                 struct setting *set)
 493 {
 494     struct session *se =  (struct session *) client_data;
 495
 496     session_apply_setting(se, nmem_strdup(se->session_nmem, set->target),
 497                           nmem_strdup(se->session_nmem, set->name),
 498                           nmem_strdup(se->session_nmem, set->value));
 499 }
 500
 501 static void cmd_settings(struct http_channel *c)
 502 {
 503     struct http_response *rs = c->response;
 504     struct http_request *rq = c->request;
 505     struct http_session *s = locate_session(c);
 506     const char *content_type = http_lookup_header(rq->headers, "Content-Type");
 507
 508     if (!s)
 509         return;
 510
 511     if (rq->content_len && content_type &&
 512         !yaz_strcmp_del("text/xml", content_type, "; "))
 513     {
 514         xmlDoc *doc = xmlParseMemory(rq->content_buf, rq->content_len);
 515         xmlNode *root_n;
 516         int ret;
 517         if (!doc)
 518         {
 519             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 520             release_session(c, s);
 521             return;
 522         }
 523         root_n = xmlDocGetRootElement(doc);
 524         ret = settings_read_node_x(root_n, s->psession, apply_local_setting);
 525         xmlFreeDoc(doc);
 526         if (ret)
 527         {
 528             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 529             release_session(c, s);
 530             return;
 531         }
 532     }
 533     if (process_settings(s->psession, rq, rs) < 0)
 534     {
 535         release_session(c, s);
 536         return;
 537     }
 538     response_open_ok(c, "settings");
 539     response_close(c, "settings");
 540     release_session(c, s);
 541 }
 542
 543 static void termlist_response(struct http_channel *c, struct http_session *s,
 544                               const char *cmd_status)
 545 {
 546     struct http_request *rq = c->request;
 547     const char *name    = http_argbyname(rq, "name");
 548     const char *nums    = http_argbyname(rq, "num");
 549     int version = get_version(rq);
 550     int num = 15;
 551     int status;
 552
 553     if (nums)
 554         num = atoi(nums);
 555
 556     status = session_active_clients(s->psession);
 557
 558     response_open_command(c, "termlist");
 559     /* new protocol add a status to response. Triggered by a status parameter */
 560     if (cmd_status != 0)
 561         wrbuf_printf(c->wrbuf, "<status>%s</status>\n", cmd_status);
 562     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", status);
 563
 564     perform_termlist(c, s->psession, name, num, version);
 565
 566     response_close(c, "termlist");
 567 }
 568
 569 static void termlist_result_ready(void *data)
 570 {
 571     struct http_channel *c = (struct http_channel *) data;
 572     struct http_request *rq = c->request;
 573     const char *report = http_argbyname(rq, "report");
 574     const char *status = 0;
 575     struct http_session *s = locate_session(c);
 576     if (report && !strcmp("status", report))
 577         status = "OK";
 578     if (s)
 579     {
 580         session_log(s->psession, c->http_sessions->log_level,
 581                     "termlist watch released");
 582         termlist_response(c, s, status);
 583         release_session(c, s);
 584     }
 585 }
 586
 587 static void cmd_termlist(struct http_channel *c)
 588 {
 589     struct http_request *rq = c->request;
 590     struct http_response *rs = c->response;
 591     struct http_session *s = locate_session(c);
 592     const char *block = http_argbyname(rq, "block");
 593     const char *report = http_argbyname(rq, "report");
 594     int report_status = 0;
 595     int report_error = 0;
 596     const char *status_message = 0;
 597     int active_clients;
 598
 599     if (report && !strcmp("error", report))
 600     {
 601         report_error = 1;
 602         status_message = "OK";
 603     }
 604     if (report && !strcmp("status", report))
 605     {
 606         report_status = 1;
 607         status_message = "OK";
 608     }
 609     if (!s)
 610         return;
 611
 612     active_clients = session_active_clients(s->psession);
 613     if (block && !strcmp("1", block) && active_clients)
 614     {
 615         // if there is already a watch/block. we do not block this one
 616         if (session_set_watch(s->psession, SESSION_WATCH_TERMLIST,
 617                               termlist_result_ready, c, c) != 0)
 618         {
 619             session_log(s->psession, YLOG_WARN, "Attempt to block "
 620                         "multiple times on termlist block. Not supported!");
 621             if (report_error) {
 622                 error(rs, PAZPAR2_ALREADY_BLOCKED, "termlist");
 623                 release_session(c, s);
 624                 return;
 625             }
 626             else if (report_status)
 627                 status_message = "WARNING (Already blocked on termlist)";
 628             else
 629                 session_log(s->psession, YLOG_WARN,
 630                             "Ignoring termlist block. Return current result");
 631         }
 632         else
 633         {
 634             session_log(s->psession, c->http_sessions->log_level,
 635                         "Blocking on command termlist");
 636             release_session(c, s);
 637             return;
 638         }
 639     }
 640
 641     termlist_response(c, s, status_message);
 642     release_session(c, s);
 643 }
 644
 645 size_t session_get_memory_status(struct session *session);
 646
 647 static void session_status(struct http_channel *c, struct http_session *s)
 648 {
 649     size_t session_nmem;
 650     wrbuf_printf(c->wrbuf, "<http_count>%u</http_count>\n",
 651                  s->activity_counter);
 652     wrbuf_printf(c->wrbuf, "<http_nmem>%zu</http_nmem>\n",
 653                  nmem_total(s->nmem) );
 654     session_nmem = session_get_memory_status(s->psession);
 655     wrbuf_printf(c->wrbuf, "<session_nmem>%zu</session_nmem>\n", session_nmem);
 656 }
 657
 658 static void cmd_service(struct http_channel *c)
 659 {
 660     struct http_session *s = locate_session(c);
 661     if (!s)
 662         return;
 663
 664     response_open_command(c, 0);
 665     if (s->psession->service->xml_node)
 666         wrbuf_puts(c->wrbuf, s->psession->service->xml_node);
 667     response_close(c, 0);
 668     release_session(c, s);
 669 }
 670
 671 static void cmd_session_status(struct http_channel *c)
 672 {
 673     struct http_session *s = locate_session(c);
 674     if (!s)
 675         return;
 676
 677     response_open_ok(c, "session-status");
 678     session_status(c, s);
 679     response_close(c, "session-status");
 680     release_session(c, s);
 681 }
 682
 683 #ifdef HAVE_RESULTSETS_COUNT
 684 int resultsets_count(void);
 685 #else
 686 #define resultsets_count()      0
 687 #endif
 688
 689 static void cmd_server_status(struct http_channel *c)
 690 {
 691     int sessions   = sessions_count();
 692     int clients    = clients_count();
 693     int resultsets = resultsets_count();
 694
 695     response_open_ok(c, "server-status");
 696     wrbuf_printf(c->wrbuf, "\n  <sessions>%u</sessions>\n", sessions);
 697     wrbuf_printf(c->wrbuf, "  <clients>%u</clients>\n",   clients);
 698     /* Only works if yaz has been compiled with enabling of this */
 699     wrbuf_printf(c->wrbuf, "  <resultsets>%u</resultsets>\n",resultsets);
 700     print_meminfo(c->wrbuf);
 701
 702 /* TODO add all sessions status                         */
 703 /*    http_sessions_t http_sessions = c->http_sessions; */
 704 /*    struct http_session *p;                           */
 705 /*
 706     yaz_mutex_enter(http_sessions->mutex);
 707     for (p = http_sessions->session_list; p; p = p->next)
 708     {
 709         p->activity_counter++;
 710         wrbuf_puts(c->wrbuf, "<session-status>\n");
 711         wrbuf_printf(c->wrbuf, "<id>%s</id>\n", p->session_id);
 712         yaz_mutex_leave(http_sessions->mutex);
 713         session_status(c, p);
 714         wrbuf_puts(c->wrbuf, "</session-status>\n");
 715         yaz_mutex_enter(http_sessions->mutex);
 716         p->activity_counter--;
 717     }
 718     yaz_mutex_leave(http_sessions->mutex);
 719 */
 720     response_close(c, "server-status");
 721     xmalloc_trav(0);
 722 }
 723
 724 static void bytarget_response(struct http_channel *c, struct http_session *s,
 725                               const char *cmd_status)
 726 {
 727     int count, i;
 728     struct http_request *rq = c->request;
 729     const char *settings = http_argbyname(rq, "settings");
 730     int version = get_version(rq);
 731     struct hitsbytarget *ht = get_hitsbytarget(s->psession, &count, c->nmem);
 732
 733     if (!cmd_status)
 734         /* Old protocol, always ok */
 735         response_open_ok(c, "bytarget");
 736     else
 737     {
 738         /* New protocol, OK or WARNING (...)*/
 739         response_open_command(c, "bytarget");
 740         wrbuf_printf(c->wrbuf, "<status>%s</status>", cmd_status);
 741     }
 742
 743     if (count == 0)
 744         session_log(s->psession, YLOG_WARN,
 745                     "Empty bytarget Response. No targets found!");
 746     for (i = 0; i < count; i++)
 747     {
 748         wrbuf_puts(c->wrbuf, "\n<target>");
 749
 750         wrbuf_puts(c->wrbuf, "<id>");
 751         wrbuf_xmlputs(c->wrbuf, ht[i].id);
 752         wrbuf_puts(c->wrbuf, "</id>\n");
 753
 754         if (ht[i].name && ht[i].name[0])
 755         {
 756             wrbuf_puts(c->wrbuf, "<name>");
 757             wrbuf_xmlputs(c->wrbuf, ht[i].name);
 758             wrbuf_puts(c->wrbuf, "</name>\n");
 759         }
 760
 761         wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", ht[i].hits);
 762         wrbuf_printf(c->wrbuf, "<diagnostic>%d</diagnostic>\n",
 763                      ht[i].diagnostic);
 764         if (ht[i].diagnostic)
 765         {
 766             wrbuf_puts(c->wrbuf, "<message>");
 767             wrbuf_xmlputs(c->wrbuf, ht[i].message);
 768             wrbuf_puts(c->wrbuf, "</message>\n");
 769             wrbuf_puts(c->wrbuf, "<addinfo>");
 770             if (ht[i].addinfo)
 771                 wrbuf_xmlputs(c->wrbuf, ht[i].addinfo);
 772             wrbuf_puts(c->wrbuf, "</addinfo>\n");
 773         }
 774
 775         wrbuf_printf(c->wrbuf, "<records>%d</records>\n",
 776                      ht[i].records - ht[i].filtered);
 777         if (version >= 2)
 778         {
 779             wrbuf_printf(c->wrbuf, "<filtered>%d</filtered>\n", ht[i].filtered);
 780             wrbuf_printf(c->wrbuf, "<approximation>" ODR_INT_PRINTF
 781                          "</approximation>\n", ht[i].approximation);
 782         }
 783         wrbuf_puts(c->wrbuf, "<state>");
 784         wrbuf_xmlputs(c->wrbuf, ht[i].state);
 785         wrbuf_puts(c->wrbuf, "</state>\n");
 786         if (settings && *settings == '1')
 787         {
 788             wrbuf_puts(c->wrbuf, "<settings>\n");
 789             wrbuf_puts(c->wrbuf, ht[i].settings_xml);
 790             wrbuf_puts(c->wrbuf, "</settings>\n");
 791         }
 792         if (ht[i].suggestions_xml && ht[i].suggestions_xml[0])
 793         {
 794             wrbuf_puts(c->wrbuf, "<suggestions>");
 795             wrbuf_puts(c->wrbuf, ht[i].suggestions_xml);
 796             wrbuf_puts(c->wrbuf, "</suggestions>");
 797         }
 798         wrbuf_puts(c->wrbuf, "</target>");
 799     }
 800     response_close(c, "bytarget");
 801 }
 802
 803 static void bytarget_result_ready(void *data)
 804 {
 805     struct http_channel *c = (struct http_channel *) data;
 806     struct http_session *s = locate_session(c);
 807     const char *status_message = "OK";
 808     if (s)
 809     {
 810         session_log(s->psession, c->http_sessions->log_level,
 811                     "bytarget watch released");
 812         bytarget_response(c, s, status_message);
 813         release_session(c, s);
 814     }
 815     else
 816         yaz_log(c->http_sessions->log_level,
 817                 "No Session found for released bytarget watch");
 818 }
 819
 820
 821 static void cmd_bytarget(struct http_channel *c)
 822 {
 823     struct http_request *rq = c->request;
 824     struct http_response *rs = c->response;
 825     struct http_session *s = locate_session(c);
 826     const char *block = http_argbyname(rq, "block");
 827     const char *report = http_argbyname(rq, "report");
 828     int report_error = 0;
 829     int report_status = 0;
 830     const char *status_message = "OK";
 831     int no_active;
 832
 833     if (report && !strcmp("error", report))
 834         report_error = 1;
 835     if (report && !strcmp("status", report))
 836         report_status = 1;
 837
 838     if (!s)
 839         return;
 840
 841     no_active = session_active_clients(s->psession);
 842     if (block && !strcmp("1", block) && no_active)
 843     {
 844         // if there is already a watch/block. we do not block this one
 845         if (session_set_watch(s->psession, SESSION_WATCH_BYTARGET,
 846                               bytarget_result_ready, c, c) != 0)
 847         {
 848             session_log(s->psession, YLOG_WARN, "Attempt to block "
 849                         "multiple times on bytarget block. Not supported!");
 850             if (report_error)
 851             {
 852                 error(rs, PAZPAR2_ALREADY_BLOCKED, "bytarget");
 853                 release_session(c, s);
 854                 return;
 855             }
 856             else if (report_status)
 857                 status_message = "WARNING (Already blocked on bytarget)";
 858             else
 859                 session_log(s->psession, YLOG_WARN, "Ignoring bytarget block."
 860                             " Return current result.");
 861         }
 862         else
 863         {
 864             session_log(s->psession, c->http_sessions->log_level,
 865                         "Blocking on command bytarget");
 866             release_session(c, s);
 867             return;
 868         }
 869     }
 870     bytarget_response(c, s, status_message);
 871     release_session(c, s);
 872 }
 873
 874 static void write_metadata(WRBUF w, struct conf_service *service,
 875                            struct record_metadata **ml, int full, int indent)
 876 {
 877     int imeta;
 878
 879     for (imeta = 0; imeta < service->num_metadata; imeta++)
 880     {
 881         struct conf_metadata *cmd = &service->metadata[imeta];
 882         struct record_metadata *md;
 883         if (!cmd->brief && !full)
 884             continue;
 885         for (md = ml[imeta]; md; md = md->next)
 886         {
 887             struct record_metadata_attr *attr = md->attributes;
 888             int i;
 889             for (i = 0; i < indent; i++)
 890                 wrbuf_putc(w, ' ');
 891             wrbuf_printf(w, "<md-%s", cmd->name);
 892
 893             for (; attr; attr = attr->next)
 894             {
 895                 wrbuf_printf(w, " %s=\"", attr->name);
 896                 wrbuf_xmlputs(w, attr->value);
 897                 wrbuf_puts(w, "\"");
 898             }
 899             wrbuf_puts(w, ">");
 900             switch (cmd->type)
 901             {
 902                 case Metadata_type_generic:
 903                     wrbuf_xmlputs(w, md->data.text.disp);
 904                     break;
 905                 case Metadata_type_year:
 906                     wrbuf_printf(w, "%d", md->data.number.min);
 907                     if (md->data.number.min != md->data.number.max)
 908                         wrbuf_printf(w, "-%d", md->data.number.max);
 909                     break;
 910                 default:
 911                     wrbuf_puts(w, "[can't represent]");
 912                     break;
 913             }
 914             wrbuf_printf(w, "</md-%s>\n", cmd->name);
 915         }
 916     }
 917 }
 918
 919 static void write_subrecord(struct record *r, WRBUF w,
 920         struct conf_service *service, int show_details)
 921 {
 922     const char *name = session_setting_oneval(
 923         client_get_database(r->client), PZ_NAME);
 924
 925     wrbuf_puts(w, " <location id=\"");
 926     wrbuf_xmlputs(w, client_get_id(r->client));
 927     wrbuf_puts(w, "\"\n");
 928
 929     wrbuf_puts(w, "    name=\"");
 930     wrbuf_xmlputs(w,  *name ? name : "Unknown");
 931     wrbuf_puts(w, "\" ");
 932
 933     wrbuf_puts(w, "checksum=\"");
 934     wrbuf_printf(w,  "%u", r->checksum);
 935     wrbuf_puts(w, "\">\n");
 936
 937     write_metadata(w, service, r->metadata, show_details, 2);
 938     wrbuf_puts(w, " </location>\n");
 939 }
 940
 941 static void show_raw_record_error(void *data, const char *addinfo)
 942 {
 943     http_channel_observer_t obs = data;
 944     struct http_channel *c = http_channel_observer_chan(obs);
 945     struct http_response *rs = c->response;
 946
 947     http_remove_observer(obs);
 948
 949     error(rs, PAZPAR2_RECORD_FAIL, addinfo);
 950 }
 951
 952 static void show_raw_record_ok(void *data, const char *buf, size_t sz)
 953 {
 954     http_channel_observer_t obs = data;
 955     struct http_channel *c = http_channel_observer_chan(obs);
 956     struct http_response *rs = c->response;
 957
 958     http_remove_observer(obs);
 959
 960     wrbuf_write(c->wrbuf, buf, sz);
 961     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 962     http_send_response(c);
 963 }
 964
 965
 966 static void show_raw_record_ok_binary(void *data, const char *buf, size_t sz)
 967 {
 968     http_channel_observer_t obs = data;
 969     struct http_channel *c = http_channel_observer_chan(obs);
 970     struct http_response *rs = c->response;
 971
 972     http_remove_observer(obs);
 973
 974     wrbuf_write(c->wrbuf, buf, sz);
 975     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 976
 977     rs->content_type = "application/octet-stream";
 978     http_send_response(c);
 979 }
 980
 981
 982 void show_raw_reset(void *data, struct http_channel *c, void *data2)
 983 {
 984     //struct client *client = data;
 985     //client_show_raw_remove(client, data2);
 986 }
 987
 988 static void cmd_record_ready(void *data);
 989
 990 static void show_record(struct http_channel *c, struct http_session *s)
 991 {
 992     struct http_response *rs = c->response;
 993     struct http_request *rq = c->request;
 994     struct record_cluster *rec, *prev_r, *next_r;
 995     struct conf_service *service;
 996     const char *idstr = http_argbyname(rq, "id");
 997     const char *offsetstr = http_argbyname(rq, "offset");
 998     const char *binarystr = http_argbyname(rq, "binary");
 999     const char *checksumstr = http_argbyname(rq, "checksum");
1000
1001     if (!s)
1002         return;
1003     service = s->psession->service;
1004     if (!idstr)
1005     {
1006         error(rs, PAZPAR2_MISSING_PARAMETER, "id");
1007         return;
1008     }
1009     wrbuf_rewind(c->wrbuf);
1010     if (!(rec = show_single_start(s->psession, idstr, &prev_r, &next_r)))
1011     {
1012         if (session_active_clients(s->psession) == 0)
1013         {
1014             error(rs, PAZPAR2_RECORD_MISSING, idstr);
1015         }
1016         else if (session_set_watch(s->psession, SESSION_WATCH_RECORD,
1017                               cmd_record_ready, c, c) != 0)
1018         {
1019             error(rs, PAZPAR2_RECORD_MISSING, idstr);
1020         }
1021         return;
1022     }
1023     if (offsetstr || checksumstr)
1024     {
1025         const char *syntax = http_argbyname(rq, "syntax");
1026         const char *esn = http_argbyname(rq, "esn");
1027         int i;
1028         struct record*r = rec->records;
1029         int binary = 0;
1030         const char *nativesyntax = http_argbyname(rq, "nativesyntax");
1031
1032         if (binarystr && *binarystr != '0')
1033             binary = 1;
1034
1035         if (checksumstr)
1036         {
1037             unsigned v = strtoul(checksumstr, 0, 10);
1038             for (i = 0; r; r = r->next)
1039                 if (v == r->checksum)
1040                     break;
1041             if (!r)
1042                 error(rs, PAZPAR2_RECORD_FAIL, "no record");
1043         }
1044         else
1045         {
1046             int offset = atoi(offsetstr);
1047             for (i = 0; i < offset && r; r = r->next, i++)
1048                 ;
1049             if (!r)
1050                 error(rs, PAZPAR2_RECORD_FAIL, "no record at offset given");
1051         }
1052         if (r)
1053         {
1054             http_channel_observer_t obs =
1055                 http_add_observer(c, r->client, show_raw_reset);
1056             int ret = client_show_raw_begin(r->client, r->position,
1057                                             syntax, esn,
1058                                             obs /* data */,
1059                                             show_raw_record_error,
1060                                             (binary ?
1061                                              show_raw_record_ok_binary :
1062                                              show_raw_record_ok),
1063                                             (binary ? 1 : 0),
1064                                             nativesyntax);
1065             if (ret == -1)
1066             {
1067                 http_remove_observer(obs);
1068                 error(rs, PAZPAR2_NO_SESSION, 0);
1069             }
1070         }
1071     }
1072     else
1073     {
1074         struct record *r;
1075         response_open_command(c, "record");
1076         wrbuf_puts(c->wrbuf, "\n <recid>");
1077         wrbuf_xmlputs(c->wrbuf, rec->recid);
1078         wrbuf_puts(c->wrbuf, "</recid>\n");
1079         if (prev_r)
1080         {
1081             wrbuf_puts(c->wrbuf, " <prevrecid>");
1082             wrbuf_xmlputs(c->wrbuf, prev_r->recid);
1083             wrbuf_puts(c->wrbuf, "</prevrecid>\n");
1084         }
1085         if (next_r)
1086         {
1087             wrbuf_puts(c->wrbuf, " <nextrecid>");
1088             wrbuf_xmlputs(c->wrbuf, next_r->recid);
1089             wrbuf_puts(c->wrbuf, "</nextrecid>\n");
1090         }
1091         wrbuf_printf(c->wrbuf, " <activeclients>%d</activeclients>\n",
1092                      session_active_clients(s->psession));
1093         write_metadata(c->wrbuf, service, rec->metadata, 1, 1);
1094         for (r = rec->records; r; r = r->next)
1095             write_subrecord(r, c->wrbuf, service, 2);
1096         response_close(c, "record");
1097     }
1098     show_single_stop(s->psession, rec);
1099 }
1100
1101 static void cmd_record_ready(void *data)
1102 {
1103     struct http_channel *c = (struct http_channel *) data;
1104     struct http_session *s = locate_session(c);
1105     if (s)
1106     {
1107         session_log(s->psession, c->http_sessions->log_level,
1108                     "record watch released");
1109         show_record(c, s);
1110         release_session(c, s);
1111     }
1112 }
1113
1114 static void cmd_record(struct http_channel *c)
1115 {
1116     struct http_session *s = locate_session(c);
1117     if (s)
1118     {
1119         show_record(c, s);
1120         release_session(c, s);
1121     }
1122 }
1123
1124
1125 static void show_records(struct http_channel *c, struct http_session *s,
1126                          int active)
1127 {
1128     struct http_request *rq = c->request;
1129     struct http_response *rs = c->response;
1130     struct record_cluster **rl;
1131     struct reclist_sortparms *sp;
1132     const char *start = http_argbyname(rq, "start");
1133     const char *num = http_argbyname(rq, "num");
1134     const char *sort = http_argbyname(rq, "sort");
1135     int version = get_version(rq);
1136
1137     int startn = 0;
1138     int numn = 20;
1139     int total;
1140     Odr_int total_hits;
1141     Odr_int approx_hits;
1142     int i;
1143     struct conf_service *service = 0;
1144     if (!s)
1145         return;
1146
1147     // We haven't counted clients yet if we're called on a block release
1148     if (active < 0)
1149         active = session_active_clients(s->psession);
1150
1151     if (start)
1152         startn = atoi(start);
1153     if (num)
1154         numn = atoi(num);
1155
1156     service = s->psession->service;
1157     if (!sort)
1158         sort = service->default_sort;
1159     if (!(sp = reclist_parse_sortparms(c->nmem, sort, service)))
1160     {
1161         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1162         return;
1163
1164     }
1165
1166     rl = show_range_start(s->psession, sp, startn, &numn, &total,
1167                           &total_hits, &approx_hits, show_records_ready, c);
1168     if (!rl)
1169         return;
1170
1171     response_open_ok(c, "show");
1172     wrbuf_printf(c->wrbuf, "\n<activeclients>%d</activeclients>\n", active);
1173     wrbuf_printf(c->wrbuf, "<merged>%d</merged>\n", total);
1174     wrbuf_printf(c->wrbuf, "<total>" ODR_INT_PRINTF "</total>\n", total_hits);
1175     if (version >= 2)
1176         wrbuf_printf(c->wrbuf, "<approximation>" ODR_INT_PRINTF
1177                      "</approximation>\n", approx_hits);
1178
1179     wrbuf_printf(c->wrbuf, "<start>%d</start>\n", startn);
1180     wrbuf_printf(c->wrbuf, "<num>%d</num>\n", numn);
1181
1182     for (i = 0; i < numn; i++)
1183     {
1184         int ccount;
1185         struct record *p;
1186         struct record_cluster *rec = rl[i];
1187         struct conf_service *service = s->psession->service;
1188
1189         wrbuf_puts(c->wrbuf, "<hit>\n");
1190         write_metadata(c->wrbuf, service, rec->metadata, 0, 1);
1191         for (ccount = 0, p = rl[i]->records; p;  p = p->next, ccount++)
1192             write_subrecord(p, c->wrbuf, service, 0); // subrecs w/o details
1193         wrbuf_printf(c->wrbuf, " <count>%d</count>\n", ccount);
1194         if (strstr(sort, "relevance"))
1195         {
1196             wrbuf_printf(c->wrbuf, " <relevance>%d</relevance>\n",
1197                          rec->relevance_score);
1198             if (service->rank_debug)
1199             {
1200                 wrbuf_printf(c->wrbuf, " <relevance_info>\n");
1201                 wrbuf_xmlputs(c->wrbuf, wrbuf_cstr(rec->relevance_explain1));
1202                 wrbuf_xmlputs(c->wrbuf, wrbuf_cstr(rec->relevance_explain2));
1203                 wrbuf_printf(c->wrbuf, " </relevance_info>\n");
1204             }
1205         }
1206         wrbuf_puts(c->wrbuf, " <recid>");
1207         wrbuf_xmlputs(c->wrbuf, rec->recid);
1208         wrbuf_puts(c->wrbuf, "</recid>\n");
1209         wrbuf_puts(c->wrbuf, "</hit>\n");
1210     }
1211
1212     show_range_stop(s->psession, rl);
1213
1214     response_close(c, "show");
1215 }
1216
1217 static void show_records_ready(void *data)
1218 {
1219     struct http_channel *c = (struct http_channel *) data;
1220     struct http_session *s = locate_session(c);
1221     if (s)
1222     {
1223         session_log(s->psession, c->http_sessions->log_level,
1224                     "show watch released");
1225         show_records(c, s, -1);
1226     }
1227     else {
1228         /* some error message  */
1229     }
1230     release_session(c, s);
1231 }
1232
1233 static void cmd_show(struct http_channel *c)
1234 {
1235     struct http_request  *rq = c->request;
1236     struct http_response *rs = c->response;
1237     struct http_session *s = locate_session(c);
1238     const char *block = http_argbyname(rq, "block");
1239     const char *sort = http_argbyname(rq, "sort");
1240     const char *block_error = http_argbyname(rq, "report");
1241     const char *mergekey = http_argbyname(rq, "mergekey");
1242     const char *rank = http_argbyname(rq, "rank");
1243     struct conf_service *service = 0;
1244     struct reclist_sortparms *sp;
1245     int status;
1246     int report_error = 0;
1247
1248     if (block_error && !strcmp("1", block_error))
1249         report_error = 1;
1250     if (!s)
1251         return;
1252     service = s->psession->service;
1253     if (!sort)
1254         sort = service->default_sort;
1255     if (!(sp = reclist_parse_sortparms(c->nmem, sort, service)))
1256     {
1257         error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1258         release_session(c, s);
1259         return;
1260     }
1261     session_sort(s->psession, sp, mergekey, rank);
1262
1263     status = session_active_clients(s->psession);
1264
1265     if (block)
1266     {
1267         if (!strcmp(block, "preferred")
1268             && !session_is_preferred_clients_ready(s->psession)
1269             && reclist_get_num_records(s->psession->reclist) == 0)
1270         {
1271             // if there is already a watch/block. we do not block this one
1272             if (session_set_watch(s->psession, SESSION_WATCH_SHOW_PREF,
1273                                   show_records_ready, c, c) == 0)
1274             {
1275                 session_log(s->psession, c->http_sessions->log_level,
1276                             "Blocking on command show (preferred targets)");
1277                 release_session(c, s);
1278                 return;
1279             }
1280             else
1281             {
1282                 session_log(s->psession, YLOG_WARN, "Attempt to block"
1283                             " multiple times on show (preferred targets) block."
1284                             " Not supported!");
1285                 if (report_error)
1286                 {
1287                     error(rs, PAZPAR2_ALREADY_BLOCKED,
1288                           "show (preferred targets)");
1289                     release_session(c, s);
1290                     return;
1291                 }
1292                 else
1293                     session_log(s->psession, YLOG_WARN,
1294                                 "Ignoring show(preferred) block."
1295                                 " Returning current result");
1296             }
1297
1298         }
1299         else if (status)
1300         {
1301             // if there is already a watch/block. we do not block this one
1302             if (session_set_watch(s->psession, SESSION_WATCH_SHOW,
1303                                   show_records_ready, c, c) != 0)
1304             {
1305                 session_log(s->psession, YLOG_WARN, "Attempt to block"
1306                             " multiple times on show block. Not supported!");
1307                 if (report_error)
1308                 {
1309                     error(rs, PAZPAR2_ALREADY_BLOCKED, "show");
1310                     release_session(c, s);
1311                     return;
1312                 }
1313                 else
1314                     session_log(s->psession, YLOG_WARN, "Ignoring show block."
1315                                 " Returning current result");
1316             }
1317             else
1318             {
1319                 session_log(s->psession, c->http_sessions->log_level,
1320                             "Blocking on command show");
1321                 release_session(c, s);
1322                 return;
1323             }
1324         }
1325     }
1326     show_records(c, s, status);
1327     release_session(c, s);
1328 }
1329
1330 static void cmd_ping(struct http_channel *c)
1331 {
1332     struct http_session *s = locate_session(c);
1333     if (!s)
1334         return;
1335     response_open_ok(c, "ping");
1336     response_close(c, "ping");
1337     release_session(c, s);
1338 }
1339
1340 static void cmd_search(struct http_channel *c)
1341 {
1342     struct http_request *rq = c->request;
1343     struct http_response *rs = c->response;
1344     struct http_session *s = locate_session(c);
1345     const char *query = http_argbyname(rq, "query");
1346     const char *filter = http_argbyname(rq, "filter");
1347     const char *maxrecs = http_argbyname(rq, "maxrecs");
1348     const char *startrecs = http_argbyname(rq, "startrecs");
1349     const char *limit = http_argbyname(rq, "limit");
1350     const char *sort = http_argbyname(rq, "sort");
1351     const char *mergekey = http_argbyname(rq, "mergekey");
1352     const char *rank = http_argbyname(rq, "rank");
1353     enum pazpar2_error_code code;
1354     const char *addinfo = 0;
1355     struct reclist_sortparms *sp;
1356     struct conf_service *service = 0;
1357
1358     if (!s)
1359         return;
1360
1361     if (!query)
1362     {
1363         error(rs, PAZPAR2_MISSING_PARAMETER, "query");
1364         release_session(c, s);
1365         return;
1366     }
1367     if (!yaz_utf8_check(query))
1368     {
1369         error(rs, PAZPAR2_MALFORMED_PARAMETER_ENCODING, "query");
1370         release_session(c, s);
1371         return;
1372     }
1373     service = s->psession->service;
1374     if (!sort)
1375         sort = service->default_sort;
1376
1377     if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
1378     {
1379         error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1380         release_session(c, s);
1381         return;
1382     }
1383
1384     code = session_search(s->psession, query, startrecs, maxrecs, filter, limit,
1385                           &addinfo, sp, mergekey, rank);
1386     if (code)
1387     {
1388         error(rs, code, addinfo);
1389         release_session(c, s);
1390         return;
1391     }
1392     response_open_ok(c, "search");
1393     response_close(c, "search");
1394     release_session(c, s);
1395 }
1396
1397
1398 static void cmd_stat(struct http_channel *c)
1399 {
1400     struct http_session *s = locate_session(c);
1401     struct statistics stat;
1402     int clients;
1403
1404     float progress = 0;
1405
1406     if (!s)
1407         return;
1408
1409     clients = session_active_clients(s->psession);
1410     statistics(s->psession, &stat);
1411
1412     if (stat.num_clients > 0)
1413     {
1414         progress = (stat.num_clients  - clients) / (float)stat.num_clients;
1415     }
1416
1417     response_open_command(c, "stat");
1418     wrbuf_printf(c->wrbuf, "\n <activeclients>%d</activeclients>\n", clients);
1419     wrbuf_printf(c->wrbuf, " <hits>" ODR_INT_PRINTF "</hits>\n", stat.num_hits);
1420     wrbuf_printf(c->wrbuf, " <records>%d</records>\n", stat.num_records);
1421     wrbuf_printf(c->wrbuf, " <clients>%d</clients>\n", stat.num_clients);
1422     wrbuf_printf(c->wrbuf, " <unconnected>%d</unconnected>\n", stat.num_no_connection);
1423     wrbuf_printf(c->wrbuf, " <connecting>%d</connecting>\n", stat.num_connecting);
1424     wrbuf_printf(c->wrbuf, " <working>%d</working>\n", stat.num_working);
1425     wrbuf_printf(c->wrbuf, " <idle>%d</idle>\n", stat.num_idle);
1426     wrbuf_printf(c->wrbuf, " <failed>%d</failed>\n", stat.num_failed);
1427     wrbuf_printf(c->wrbuf, " <error>%d</error>\n", stat.num_error);
1428     wrbuf_printf(c->wrbuf, " <progress>%.2f</progress>\n", progress);
1429     response_close(c, "stat");
1430     release_session(c, s);
1431 }
1432
1433 static void cmd_info(struct http_channel *c)
1434 {
1435     char yaz_version_str[20];
1436     char yaz_sha1_str[42];
1437
1438     response_open_command(c, "info");
1439     wrbuf_puts(c->wrbuf, "\n <version>\n");
1440     wrbuf_puts(c->wrbuf, "  <pazpar2");
1441 #ifdef PAZPAR2_VERSION_SHA1
1442     wrbuf_printf(c->wrbuf, " sha1=\"%s\"", PAZPAR2_VERSION_SHA1);
1443 #endif
1444     wrbuf_puts(c->wrbuf, ">");
1445     wrbuf_xmlputs(c->wrbuf, VERSION);
1446     wrbuf_puts(c->wrbuf, "</pazpar2>\n");
1447
1448     yaz_version(yaz_version_str, yaz_sha1_str);
1449     wrbuf_puts(c->wrbuf, "  <yaz compiled=\"");
1450     wrbuf_xmlputs(c->wrbuf, YAZ_VERSION);
1451     wrbuf_puts(c->wrbuf, "\" sha1=\"");
1452     wrbuf_xmlputs(c->wrbuf, yaz_sha1_str);
1453     wrbuf_puts(c->wrbuf, "\">");
1454     wrbuf_xmlputs(c->wrbuf, yaz_version_str);
1455     wrbuf_puts(c->wrbuf, "</yaz>\n");
1456
1457     wrbuf_puts(c->wrbuf, " </version>\n");
1458 #if HAVE_UNISTD_H
1459     {
1460         char hostname_str[64];
1461         if (gethostname(hostname_str, sizeof(hostname_str)) == 0)
1462         {
1463             wrbuf_puts(c->wrbuf, " <host>");
1464             wrbuf_xmlputs(c->wrbuf, hostname_str);
1465             wrbuf_puts(c->wrbuf, "</host>\n");
1466         }
1467     }
1468 #endif
1469     info_services(c->server, c->wrbuf);
1470
1471     response_close(c, "info");
1472 }
1473
1474 struct {
1475     char *name;
1476     void (*fun)(struct http_channel *c);
1477 } commands[] = {
1478     { "init", cmd_init },
1479     { "settings", cmd_settings },
1480     { "stat", cmd_stat },
1481     { "bytarget", cmd_bytarget },
1482     { "show", cmd_show },
1483     { "search", cmd_search },
1484     { "termlist", cmd_termlist },
1485     { "exit", cmd_exit },
1486     { "session-status", cmd_session_status },
1487     { "server-status", cmd_server_status },
1488     { "service", cmd_service },
1489     { "ping", cmd_ping },
1490     { "record", cmd_record },
1491     { "info", cmd_info },
1492     {0,0}
1493 };
1494
1495 void http_command(struct http_channel *c)
1496 {
1497     const char *command = http_argbyname(c->request, "command");
1498     struct http_response *rs = http_create_response(c);
1499     int i;
1500
1501     c->response = rs;
1502
1503     http_addheader(rs, "Expires", "Thu, 19 Nov 1981 08:52:00 GMT");
1504     http_addheader(rs, "Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
1505
1506     if (!command)
1507     {
1508         error(rs, PAZPAR2_MISSING_PARAMETER, "command");
1509         return;
1510     }
1511     for (i = 0; commands[i].name; i++)
1512         if (!strcmp(commands[i].name, command))
1513         {
1514             (*commands[i].fun)(c);
1515             break;
1516         }
1517     if (!commands[i].name)
1518         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "command");
1519
1520     return;
1521 }
1522
1523 /*
1524  * Local variables:
1525  * c-basic-offset: 4
1526  * c-file-style: "Stroustrup"
1527  * indent-tabs-mode: nil
1528  * End:
1529  * vim: shiftwidth=4 tabstop=8 expandtab
1530  */
1531