src/http_command.c

   1 /* This file is part of Pazpar2.
   2    Copyright (C) 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 error2(struct http_response *rs,
 267                    enum pazpar2_error_code code,
 268                    const char *addinfo, const char *addinfo2)
 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     {
 282         wrbuf_xmlputs(text, addinfo);
 283         if (addinfo2)
 284         {
 285             wrbuf_xmlputs(text, ": ");
 286             wrbuf_xmlputs(text, addinfo2);
 287         }
 288     }
 289     wrbuf_puts(text, "</error>");
 290
 291     yaz_log(YLOG_WARN, "HTTP %s %s%s%s", http_status,
 292             msg, addinfo ? ": " : "" , addinfo ? addinfo : "");
 293     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(text));
 294     wrbuf_destroy(text);
 295     http_send_response(c);
 296 }
 297
 298 static void error(struct http_response *rs,
 299                   enum pazpar2_error_code code,
 300                   const char *addinfo)
 301 {
 302     error2(rs, code, addinfo, 0);
 303 }
 304
 305 static void response_open_command(struct http_channel *c, const char *command)
 306 {
 307     wrbuf_rewind(c->wrbuf);
 308     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX);
 309     if (command)
 310         wrbuf_printf(c->wrbuf, "<%s>", command);
 311 }
 312
 313 static void response_open_ok(struct http_channel *c, const char *command)
 314 {
 315     response_open_command(c, command);
 316     wrbuf_puts(c->wrbuf, "<status>OK</status>");
 317 }
 318
 319 static void response_close(struct http_channel *c, const char *command)
 320 {
 321     struct http_response *rs = c->response;
 322
 323     if (command)
 324         wrbuf_printf(c->wrbuf, "</%s>", command);
 325     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 326     http_send_response(c);
 327 }
 328
 329 unsigned int make_sessionid(void)
 330 {
 331     static int seq = 0; /* thread pr */
 332     unsigned int res;
 333
 334     seq++;
 335     if (global_parameters.predictable_sessions)
 336         res = seq;
 337     else
 338     {
 339 #ifdef WIN32
 340         res = seq;
 341 #else
 342         struct timeval t;
 343
 344         if (gettimeofday(&t, 0) < 0)
 345         {
 346             yaz_log(YLOG_WARN|YLOG_ERRNO, "gettimeofday");
 347             exit(1);
 348         }
 349         /* at most 256 sessions per second ..
 350            (long long would be more appropriate)*/
 351         res = t.tv_sec;
 352         res = ((res << 8) | (seq & 0xff)) & ((1U << 31) - 1);
 353 #endif
 354     }
 355     return res;
 356 }
 357
 358 static struct http_session *locate_session(struct http_channel *c)
 359 {
 360     struct http_request *rq = c->request;
 361     struct http_response *rs = c->response;
 362     struct http_session *p;
 363     const char *session = http_argbyname(rq, "session");
 364     http_sessions_t http_sessions = c->http_sessions;
 365     unsigned int id;
 366
 367     if (!session)
 368     {
 369         error(rs, PAZPAR2_MISSING_PARAMETER, "session");
 370         return 0;
 371     }
 372     id = atoi(session);
 373     yaz_mutex_enter(http_sessions->mutex);
 374     for (p = http_sessions->session_list; p; p = p->next)
 375         if (id == p->session_id)
 376             break;
 377     if (p)
 378         p->activity_counter++;
 379     yaz_mutex_leave(http_sessions->mutex);
 380     if (p)
 381         iochan_activity(p->timeout_iochan);
 382     else
 383         error(rs, PAZPAR2_NO_SESSION, session);
 384     return p;
 385 }
 386
 387 // Call after use of locate_session, in order to increment the destroy_counter
 388 static void release_session(struct http_channel *c,
 389                             struct http_session *session)
 390 {
 391     http_sessions_t http_sessions = c->http_sessions;
 392     yaz_mutex_enter(http_sessions->mutex);
 393     if (session)
 394         session->destroy_counter++;
 395     yaz_mutex_leave(http_sessions->mutex);
 396 }
 397
 398 // Decode settings parameters and apply to session
 399 // Syntax: setting[target]=value
 400 static int process_settings(struct session *se, struct http_request *rq,
 401                             struct http_response *rs)
 402 {
 403     struct http_argument *a;
 404     NMEM nmem = nmem_create();
 405
 406     for (a = rq->arguments; a; a = a->next)
 407         if (strchr(a->name, '['))
 408         {
 409             char **res;
 410             int num;
 411             char *dbname;
 412             char *setting;
 413
 414             // Nmem_strsplit *rules*!!!
 415             nmem_strsplit(nmem, "[]", a->name, &res, &num);
 416             if (num != 2)
 417             {
 418                 error(rs, PAZPAR2_MALFORMED_SETTING, a->name);
 419                 nmem_destroy(nmem);
 420                 return -1;
 421             }
 422             setting = res[0];
 423             dbname = res[1];
 424             session_apply_setting(se, dbname, setting, a->value);
 425         }
 426     nmem_destroy(nmem);
 427     return 0;
 428 }
 429
 430 static void cmd_exit(struct http_channel *c)
 431 {
 432     yaz_log(YLOG_WARN, "exit");
 433
 434     response_open_ok(c, "exit");
 435     response_close(c, "exit");
 436     if (global_parameters.debug_mode)
 437         http_close_server(c->server);
 438 }
 439
 440 static void cmd_init(struct http_channel *c)
 441 {
 442     struct http_request *r = c->request;
 443     const char *clear = http_argbyname(r, "clear");
 444     const char *content_type = http_lookup_header(r->headers, "Content-Type");
 445     unsigned int sesid;
 446     struct http_session *s;
 447     struct http_response *rs = c->response;
 448     struct conf_service *service = 0; /* no service (yet) */
 449
 450     if (r->content_len && content_type &&
 451         !yaz_strcmp_del("text/xml", content_type, "; "))
 452     {
 453         xmlDoc *doc = xmlParseMemory(r->content_buf, r->content_len);
 454         xmlNode *root_n;
 455         if (!doc)
 456         {
 457             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 458             return;
 459         }
 460         root_n = xmlDocGetRootElement(doc);
 461         service = service_create(c->server, root_n);
 462         xmlFreeDoc(doc);
 463         if (!service)
 464         {
 465             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 466             return;
 467         }
 468     }
 469
 470     if (!service)
 471     {
 472         const char *service_name = http_argbyname(c->request, "service");
 473         service = locate_service(c->server, service_name);
 474         if (!service)
 475         {
 476             error(rs, PAZPAR2_NO_SERVICE, service_name ? service_name : "unnamed");
 477             return;
 478         }
 479     }
 480     sesid = make_sessionid();
 481     s = http_session_create(service, c->http_sessions, sesid);
 482
 483     if (!clear || *clear == '0')
 484         session_init_databases(s->psession);
 485     else
 486         session_log(s->psession, YLOG_LOG, "No databases preloaded");
 487
 488     if (process_settings(s->psession, c->request, c->response) < 0)
 489         return;
 490
 491     response_open_ok(c, "init");
 492     wrbuf_printf(c->wrbuf, "<session>%d", sesid);
 493     if (c->server->server_id)
 494     {
 495         wrbuf_puts(c->wrbuf, ".");
 496         wrbuf_puts(c->wrbuf, c->server->server_id);
 497     }
 498     wrbuf_puts(c->wrbuf, "</session>"
 499                "<protocol>" PAZPAR2_PROTOCOL_VERSION "</protocol>");
 500
 501     wrbuf_printf(c->wrbuf, "<keepAlive>%d</keepAlive>\n",
 502                  1000 * ((s->psession->service->session_timeout >= 20) ?
 503                          (s->psession->service->session_timeout - 10) : 50));
 504     response_close(c, "init");
 505 }
 506
 507 static void apply_local_setting(void *client_data,
 508                                 struct setting *set)
 509 {
 510     struct session *se =  (struct session *) client_data;
 511
 512     session_apply_setting(se, set->target, set->name, set->value);
 513 }
 514
 515 static void cmd_settings(struct http_channel *c)
 516 {
 517     struct http_response *rs = c->response;
 518     struct http_request *rq = c->request;
 519     struct http_session *s = locate_session(c);
 520     const char *content_type = http_lookup_header(rq->headers, "Content-Type");
 521
 522     if (!s)
 523         return;
 524
 525     if (rq->content_len && content_type &&
 526         !yaz_strcmp_del("text/xml", content_type, "; "))
 527     {
 528         xmlDoc *doc = xmlParseMemory(rq->content_buf, rq->content_len);
 529         xmlNode *root_n;
 530         int ret;
 531         if (!doc)
 532         {
 533             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 534             release_session(c, s);
 535             return;
 536         }
 537         root_n = xmlDocGetRootElement(doc);
 538         ret = settings_read_node_x(root_n, s->psession, apply_local_setting);
 539         xmlFreeDoc(doc);
 540         if (ret)
 541         {
 542             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 543             release_session(c, s);
 544             return;
 545         }
 546     }
 547     if (process_settings(s->psession, rq, rs) < 0)
 548     {
 549         release_session(c, s);
 550         return;
 551     }
 552     response_open_ok(c, "settings");
 553     response_close(c, "settings");
 554     release_session(c, s);
 555 }
 556
 557 static void termlist_response(struct http_channel *c, struct http_session *s,
 558                               const char *cmd_status)
 559 {
 560     struct http_request *rq = c->request;
 561     const char *name    = http_argbyname(rq, "name");
 562     const char *nums    = http_argbyname(rq, "num");
 563     int version = get_version(rq);
 564     int num = 15;
 565     int status;
 566
 567     if (nums)
 568         num = atoi(nums);
 569
 570     status = session_active_clients(s->psession);
 571
 572     response_open_command(c, "termlist");
 573     /* new protocol add a status to response. Triggered by a status parameter */
 574     if (cmd_status != 0)
 575         wrbuf_printf(c->wrbuf, "<status>%s</status>\n", cmd_status);
 576     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", status);
 577
 578     perform_termlist(c, s->psession, name, num, version);
 579
 580     response_close(c, "termlist");
 581 }
 582
 583 static void termlist_result_ready(void *data)
 584 {
 585     struct http_channel *c = (struct http_channel *) data;
 586     struct http_request *rq = c->request;
 587     const char *report = http_argbyname(rq, "report");
 588     const char *status = 0;
 589     struct http_session *s = locate_session(c);
 590     if (report && !strcmp("status", report))
 591         status = "OK";
 592     if (s)
 593     {
 594         session_log(s->psession, c->http_sessions->log_level,
 595                     "termlist watch released");
 596         termlist_response(c, s, status);
 597         release_session(c, s);
 598     }
 599 }
 600
 601 static void cmd_termlist(struct http_channel *c)
 602 {
 603     struct http_request *rq = c->request;
 604     struct http_response *rs = c->response;
 605     struct http_session *s = locate_session(c);
 606     const char *block = http_argbyname(rq, "block");
 607     const char *report = http_argbyname(rq, "report");
 608     int report_status = 0;
 609     int report_error = 0;
 610     const char *status_message = 0;
 611     int active_clients;
 612
 613     if (report && !strcmp("error", report))
 614     {
 615         report_error = 1;
 616         status_message = "OK";
 617     }
 618     if (report && !strcmp("status", report))
 619     {
 620         report_status = 1;
 621         status_message = "OK";
 622     }
 623     if (!s)
 624         return;
 625
 626     active_clients = session_active_clients(s->psession);
 627     if (block && !strcmp("1", block) && active_clients)
 628     {
 629         // if there is already a watch/block. we do not block this one
 630         if (session_set_watch(s->psession, SESSION_WATCH_TERMLIST,
 631                               termlist_result_ready, c, c) != 0)
 632         {
 633             session_log(s->psession, YLOG_WARN, "Attempt to block "
 634                         "multiple times on termlist block. Not supported!");
 635             if (report_error) {
 636                 error(rs, PAZPAR2_ALREADY_BLOCKED, "termlist");
 637                 release_session(c, s);
 638                 return;
 639             }
 640             else if (report_status)
 641                 status_message = "WARNING (Already blocked on termlist)";
 642             else
 643                 session_log(s->psession, YLOG_WARN,
 644                             "Ignoring termlist block. Return current result");
 645         }
 646         else
 647         {
 648             session_log(s->psession, c->http_sessions->log_level,
 649                         "Blocking on command termlist");
 650             release_session(c, s);
 651             return;
 652         }
 653     }
 654
 655     termlist_response(c, s, status_message);
 656     release_session(c, s);
 657 }
 658
 659 size_t session_get_memory_status(struct session *session);
 660
 661 static void session_status(struct http_channel *c, struct http_session *s)
 662 {
 663     size_t session_nmem;
 664     wrbuf_printf(c->wrbuf, "<http_count>%u</http_count>\n",
 665                  s->activity_counter);
 666     wrbuf_printf(c->wrbuf, "<http_nmem>%zu</http_nmem>\n",
 667                  nmem_total(s->nmem) );
 668     session_nmem = session_get_memory_status(s->psession);
 669     wrbuf_printf(c->wrbuf, "<session_nmem>%zu</session_nmem>\n", session_nmem);
 670 }
 671
 672 static void cmd_service(struct http_channel *c)
 673 {
 674     struct http_session *s = locate_session(c);
 675     if (!s)
 676         return;
 677
 678     response_open_command(c, 0);
 679     if (s->psession->service->xml_node)
 680         wrbuf_puts(c->wrbuf, s->psession->service->xml_node);
 681     response_close(c, 0);
 682     release_session(c, s);
 683 }
 684
 685 static void cmd_session_status(struct http_channel *c)
 686 {
 687     struct http_session *s = locate_session(c);
 688     if (!s)
 689         return;
 690
 691     response_open_ok(c, "session-status");
 692     session_status(c, s);
 693     response_close(c, "session-status");
 694     release_session(c, s);
 695 }
 696
 697 #ifdef HAVE_RESULTSETS_COUNT
 698 int resultsets_count(void);
 699 #else
 700 #define resultsets_count()      0
 701 #endif
 702
 703 static void cmd_server_status(struct http_channel *c)
 704 {
 705     int sessions   = sessions_count();
 706     int clients    = clients_count();
 707     int resultsets = resultsets_count();
 708
 709     response_open_ok(c, "server-status");
 710     wrbuf_printf(c->wrbuf, "\n  <sessions>%u</sessions>\n", sessions);
 711     wrbuf_printf(c->wrbuf, "  <clients>%u</clients>\n",   clients);
 712     /* Only works if yaz has been compiled with enabling of this */
 713     wrbuf_printf(c->wrbuf, "  <resultsets>%u</resultsets>\n",resultsets);
 714     print_meminfo(c->wrbuf);
 715
 716 /* TODO add all sessions status                         */
 717 /*    http_sessions_t http_sessions = c->http_sessions; */
 718 /*    struct http_session *p;                           */
 719 /*
 720     yaz_mutex_enter(http_sessions->mutex);
 721     for (p = http_sessions->session_list; p; p = p->next)
 722     {
 723         p->activity_counter++;
 724         wrbuf_puts(c->wrbuf, "<session-status>\n");
 725         wrbuf_printf(c->wrbuf, "<id>%s</id>\n", p->session_id);
 726         yaz_mutex_leave(http_sessions->mutex);
 727         session_status(c, p);
 728         wrbuf_puts(c->wrbuf, "</session-status>\n");
 729         yaz_mutex_enter(http_sessions->mutex);
 730         p->activity_counter--;
 731     }
 732     yaz_mutex_leave(http_sessions->mutex);
 733 */
 734     response_close(c, "server-status");
 735     xmalloc_trav(0);
 736 }
 737
 738 static void bytarget_response(struct http_channel *c, struct http_session *s,
 739                               const char *cmd_status)
 740 {
 741     int count, i;
 742     struct http_request *rq = c->request;
 743     const char *settings = http_argbyname(rq, "settings");
 744     int version = get_version(rq);
 745     struct hitsbytarget *ht = get_hitsbytarget(s->psession, &count, c->nmem);
 746
 747     if (!cmd_status)
 748         /* Old protocol, always ok */
 749         response_open_ok(c, "bytarget");
 750     else
 751     {
 752         /* New protocol, OK or WARNING (...)*/
 753         response_open_command(c, "bytarget");
 754         wrbuf_printf(c->wrbuf, "<status>%s</status>", cmd_status);
 755     }
 756
 757     if (count == 0)
 758         session_log(s->psession, YLOG_WARN,
 759                     "Empty bytarget Response. No targets found!");
 760     for (i = 0; i < count; i++)
 761     {
 762         wrbuf_puts(c->wrbuf, "\n<target>");
 763
 764         wrbuf_puts(c->wrbuf, "<id>");
 765         wrbuf_xmlputs(c->wrbuf, ht[i].id);
 766         wrbuf_puts(c->wrbuf, "</id>\n");
 767
 768         if (ht[i].name && ht[i].name[0])
 769         {
 770             wrbuf_puts(c->wrbuf, "<name>");
 771             wrbuf_xmlputs(c->wrbuf, ht[i].name);
 772             wrbuf_puts(c->wrbuf, "</name>\n");
 773         }
 774
 775         wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", ht[i].hits);
 776         wrbuf_printf(c->wrbuf, "<diagnostic>%d</diagnostic>\n",
 777                      ht[i].diagnostic);
 778         if (ht[i].diagnostic)
 779         {
 780             wrbuf_puts(c->wrbuf, "<message>");
 781             wrbuf_xmlputs(c->wrbuf, ht[i].message);
 782             wrbuf_puts(c->wrbuf, "</message>\n");
 783             wrbuf_puts(c->wrbuf, "<addinfo>");
 784             if (ht[i].addinfo)
 785                 wrbuf_xmlputs(c->wrbuf, ht[i].addinfo);
 786             wrbuf_puts(c->wrbuf, "</addinfo>\n");
 787         }
 788
 789         wrbuf_printf(c->wrbuf, "<records>%d</records>\n",
 790                      ht[i].records - ht[i].filtered);
 791         wrbuf_printf(c->wrbuf, "<filtered>%d</filtered>\n", ht[i].filtered);
 792         if (version >= 2)
 793         {
 794             wrbuf_printf(c->wrbuf, "<approximation>" ODR_INT_PRINTF
 795                          "</approximation>\n", ht[i].approximation);
 796         }
 797         wrbuf_puts(c->wrbuf, "<state>");
 798         wrbuf_xmlputs(c->wrbuf, ht[i].state);
 799         wrbuf_puts(c->wrbuf, "</state>\n");
 800         if (settings && *settings == '1')
 801         {
 802             wrbuf_puts(c->wrbuf, "<settings>\n");
 803             wrbuf_puts(c->wrbuf, ht[i].settings_xml);
 804             wrbuf_puts(c->wrbuf, "</settings>\n");
 805         }
 806         if (ht[i].suggestions_xml && ht[i].suggestions_xml[0])
 807         {
 808             wrbuf_puts(c->wrbuf, "<suggestions>");
 809             wrbuf_puts(c->wrbuf, ht[i].suggestions_xml);
 810             wrbuf_puts(c->wrbuf, "</suggestions>");
 811         }
 812         wrbuf_puts(c->wrbuf, "</target>");
 813     }
 814     response_close(c, "bytarget");
 815 }
 816
 817 static void bytarget_result_ready(void *data)
 818 {
 819     struct http_channel *c = (struct http_channel *) data;
 820     struct http_session *s = locate_session(c);
 821     const char *status_message = "OK";
 822     if (s)
 823     {
 824         session_log(s->psession, c->http_sessions->log_level,
 825                     "bytarget watch released");
 826         bytarget_response(c, s, status_message);
 827         release_session(c, s);
 828     }
 829     else
 830         yaz_log(c->http_sessions->log_level,
 831                 "No Session found for released bytarget watch");
 832 }
 833
 834
 835 static void cmd_bytarget(struct http_channel *c)
 836 {
 837     struct http_request *rq = c->request;
 838     struct http_response *rs = c->response;
 839     struct http_session *s = locate_session(c);
 840     const char *block = http_argbyname(rq, "block");
 841     const char *report = http_argbyname(rq, "report");
 842     int report_error = 0;
 843     int report_status = 0;
 844     const char *status_message = "OK";
 845     int no_active;
 846
 847     if (report && !strcmp("error", report))
 848         report_error = 1;
 849     if (report && !strcmp("status", report))
 850         report_status = 1;
 851
 852     if (!s)
 853         return;
 854
 855     no_active = session_active_clients(s->psession);
 856     if (block && !strcmp("1", block) && no_active)
 857     {
 858         // if there is already a watch/block. we do not block this one
 859         if (session_set_watch(s->psession, SESSION_WATCH_BYTARGET,
 860                               bytarget_result_ready, c, c) != 0)
 861         {
 862             session_log(s->psession, YLOG_WARN, "Attempt to block "
 863                         "multiple times on bytarget block. Not supported!");
 864             if (report_error)
 865             {
 866                 error(rs, PAZPAR2_ALREADY_BLOCKED, "bytarget");
 867                 release_session(c, s);
 868                 return;
 869             }
 870             else if (report_status)
 871                 status_message = "WARNING (Already blocked on bytarget)";
 872             else
 873                 session_log(s->psession, YLOG_WARN, "Ignoring bytarget block."
 874                             " Return current result.");
 875         }
 876         else
 877         {
 878             session_log(s->psession, c->http_sessions->log_level,
 879                         "Blocking on command bytarget");
 880             release_session(c, s);
 881             return;
 882         }
 883     }
 884     bytarget_response(c, s, status_message);
 885     release_session(c, s);
 886 }
 887
 888 static void write_metadata(WRBUF w, struct conf_service *service,
 889                            struct record_metadata **ml, unsigned flags,
 890                            int indent)
 891 {
 892     int imeta;
 893
 894     for (imeta = 0; imeta < service->num_metadata; imeta++)
 895     {
 896         struct conf_metadata *cmd = &service->metadata[imeta];
 897         struct record_metadata *md;
 898         if (!cmd->brief && !(flags & 1))
 899             continue;
 900         for (md = ml[imeta]; md; md = md->next)
 901         {
 902             struct record_metadata_attr *attr = md->attributes;
 903             int i;
 904             for (i = 0; i < indent; i++)
 905                 wrbuf_putc(w, ' ');
 906             wrbuf_printf(w, "<md-%s", cmd->name);
 907
 908             for (; attr; attr = attr->next)
 909             {
 910                 wrbuf_printf(w, " %s=\"", attr->name);
 911                 wrbuf_xmlputs(w, attr->value);
 912                 wrbuf_puts(w, "\"");
 913             }
 914             wrbuf_puts(w, ">");
 915             switch (cmd->type)
 916             {
 917                 case Metadata_type_generic:
 918                     if (md->data.text.snippet && (flags & 2))
 919                         wrbuf_puts(w, md->data.text.snippet);
 920                     else
 921                         wrbuf_xmlputs(w, md->data.text.disp);
 922                     break;
 923                 case Metadata_type_year:
 924                     wrbuf_printf(w, "%d", md->data.number.min);
 925                     if (md->data.number.min != md->data.number.max)
 926                         wrbuf_printf(w, "-%d", md->data.number.max);
 927                     break;
 928                 case Metadata_type_float:
 929                     wrbuf_printf(w, "%f", md->data.fnumber);
 930                     break;
 931                 default:
 932                     wrbuf_puts(w, "[can't represent]");
 933                     break;
 934             }
 935             wrbuf_printf(w, "</md-%s>\n", cmd->name);
 936         }
 937     }
 938 }
 939
 940 static void write_subrecord(struct record *r, WRBUF w,
 941                             struct conf_service *service, unsigned flags,
 942                             int indent)
 943 {
 944     const char *name = session_setting_oneval(
 945         client_get_database(r->client), PZ_NAME);
 946
 947     wrbuf_puts(w, " <location id=\"");
 948     wrbuf_xmlputs(w, client_get_id(r->client));
 949     wrbuf_puts(w, "\"\n");
 950
 951     wrbuf_puts(w, "    name=\"");
 952     wrbuf_xmlputs(w,  *name ? name : "Unknown");
 953     wrbuf_puts(w, "\" ");
 954
 955     wrbuf_puts(w, "checksum=\"");
 956     wrbuf_printf(w,  "%u", r->checksum);
 957     wrbuf_puts(w, "\">\n");
 958
 959     write_metadata(w, service, r->metadata, flags, indent);
 960     wrbuf_puts(w, " </location>\n");
 961 }
 962
 963 static void show_raw_record_error(void *data, const char *addinfo)
 964 {
 965     http_channel_observer_t obs = data;
 966     struct http_channel *c = http_channel_observer_chan(obs);
 967     struct http_response *rs = c->response;
 968
 969     http_remove_observer(obs);
 970
 971     error(rs, PAZPAR2_RECORD_FAIL, addinfo);
 972 }
 973
 974 static void show_raw_record_ok(void *data, const char *buf, size_t sz)
 975 {
 976     http_channel_observer_t obs = data;
 977     struct http_channel *c = http_channel_observer_chan(obs);
 978     struct http_response *rs = c->response;
 979
 980     http_remove_observer(obs);
 981
 982     wrbuf_write(c->wrbuf, buf, sz);
 983     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 984     http_send_response(c);
 985 }
 986
 987
 988 static void show_raw_record_ok_binary(void *data, const char *buf, size_t sz)
 989 {
 990     http_channel_observer_t obs = data;
 991     struct http_channel *c = http_channel_observer_chan(obs);
 992     struct http_response *rs = c->response;
 993
 994     http_remove_observer(obs);
 995
 996     wrbuf_write(c->wrbuf, buf, sz);
 997     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 998
 999     rs->content_type = "application/octet-stream";
1000     http_send_response(c);
1001 }
1002
1003
1004 void show_raw_reset(void *data, struct http_channel *c, void *data2)
1005 {
1006     //struct client *client = data;
1007     //client_show_raw_remove(client, data2);
1008 }
1009
1010 static void cmd_record_ready(void *data);
1011
1012 static void show_record(struct http_channel *c, struct http_session *s)
1013 {
1014     struct http_response *rs = c->response;
1015     struct http_request *rq = c->request;
1016     struct record_cluster *rec, *prev_r, *next_r;
1017     struct conf_service *service;
1018     const char *idstr = http_argbyname(rq, "id");
1019     const char *offsetstr = http_argbyname(rq, "offset");
1020     const char *binarystr = http_argbyname(rq, "binary");
1021     const char *checksumstr = http_argbyname(rq, "checksum");
1022     const char *snippets = http_argbyname(rq, "snippets");
1023     unsigned flags = (snippets && *snippets == '1') ? 3 : 1;
1024
1025     if (!s)
1026         return;
1027     service = s->psession->service;
1028     if (!idstr)
1029     {
1030         error(rs, PAZPAR2_MISSING_PARAMETER, "id");
1031         return;
1032     }
1033     wrbuf_rewind(c->wrbuf);
1034     if (!(rec = show_single_start(s->psession, idstr, &prev_r, &next_r)))
1035     {
1036         if (session_active_clients(s->psession) == 0)
1037         {
1038             error(rs, PAZPAR2_RECORD_MISSING, idstr);
1039         }
1040         else if (session_set_watch(s->psession, SESSION_WATCH_RECORD,
1041                               cmd_record_ready, c, c) != 0)
1042         {
1043             error(rs, PAZPAR2_RECORD_MISSING, idstr);
1044         }
1045         return;
1046     }
1047     if (offsetstr || checksumstr)
1048     {
1049         const char *syntax = http_argbyname(rq, "syntax");
1050         const char *esn = http_argbyname(rq, "esn");
1051         int i;
1052         struct record*r = rec->records;
1053         int binary = 0;
1054         const char *nativesyntax = http_argbyname(rq, "nativesyntax");
1055
1056         if (binarystr && *binarystr != '0')
1057             binary = 1;
1058
1059         if (checksumstr)
1060         {
1061             unsigned v = strtoul(checksumstr, 0, 10);
1062             for (i = 0; r; r = r->next)
1063                 if (v == r->checksum)
1064                     break;
1065             if (!r)
1066                 error(rs, PAZPAR2_RECORD_FAIL, "no record");
1067         }
1068         else
1069         {
1070             int offset = atoi(offsetstr);
1071             for (i = 0; i < offset && r; r = r->next, i++)
1072                 ;
1073             if (!r)
1074                 error(rs, PAZPAR2_RECORD_FAIL, "no record at offset given");
1075         }
1076         if (r)
1077         {
1078             http_channel_observer_t obs =
1079                 http_add_observer(c, r->client, show_raw_reset);
1080             int ret = client_show_raw_begin(r->client, r->position,
1081                                             syntax, esn,
1082                                             obs /* data */,
1083                                             show_raw_record_error,
1084                                             (binary ?
1085                                              show_raw_record_ok_binary :
1086                                              show_raw_record_ok),
1087                                             (binary ? 1 : 0),
1088                                             nativesyntax);
1089             if (ret == -1)
1090             {
1091                 http_remove_observer(obs);
1092                 error(rs, PAZPAR2_NO_SESSION, 0);
1093             }
1094         }
1095     }
1096     else
1097     {
1098         struct record *r;
1099         response_open_command(c, "record");
1100         wrbuf_puts(c->wrbuf, "\n <recid>");
1101         wrbuf_xmlputs(c->wrbuf, rec->recid);
1102         wrbuf_puts(c->wrbuf, "</recid>\n");
1103         if (prev_r)
1104         {
1105             wrbuf_puts(c->wrbuf, " <prevrecid>");
1106             wrbuf_xmlputs(c->wrbuf, prev_r->recid);
1107             wrbuf_puts(c->wrbuf, "</prevrecid>\n");
1108         }
1109         if (next_r)
1110         {
1111             wrbuf_puts(c->wrbuf, " <nextrecid>");
1112             wrbuf_xmlputs(c->wrbuf, next_r->recid);
1113             wrbuf_puts(c->wrbuf, "</nextrecid>\n");
1114         }
1115         wrbuf_printf(c->wrbuf, " <activeclients>%d</activeclients>\n",
1116                      session_active_clients(s->psession));
1117         write_metadata(c->wrbuf, service, rec->metadata, flags, 1);
1118         for (r = rec->records; r; r = r->next)
1119             write_subrecord(r, c->wrbuf, service, flags, 2);
1120         response_close(c, "record");
1121     }
1122     show_single_stop(s->psession, rec);
1123 }
1124
1125 static void cmd_record_ready(void *data)
1126 {
1127     struct http_channel *c = (struct http_channel *) data;
1128     struct http_session *s = locate_session(c);
1129     if (s)
1130     {
1131         session_log(s->psession, c->http_sessions->log_level,
1132                     "record watch released");
1133         show_record(c, s);
1134         release_session(c, s);
1135     }
1136 }
1137
1138 static void cmd_record(struct http_channel *c)
1139 {
1140     struct http_session *s = locate_session(c);
1141     if (s)
1142     {
1143         show_record(c, s);
1144         release_session(c, s);
1145     }
1146 }
1147
1148
1149 static void show_records(struct http_channel *c, struct http_session *s,
1150                          int active)
1151 {
1152     struct http_request *rq = c->request;
1153     struct http_response *rs = c->response;
1154     struct record_cluster **rl;
1155     struct reclist_sortparms *sp;
1156     const char *start = http_argbyname(rq, "start");
1157     const char *num = http_argbyname(rq, "num");
1158     const char *sort = http_argbyname(rq, "sort");
1159     int version = get_version(rq);
1160     const char *snippets = http_argbyname(rq, "snippets");
1161     unsigned flags = (snippets && *snippets == '1') ? 2 : 0;
1162
1163     int startn = 0;
1164     int numn = 20;
1165     int total;
1166     Odr_int total_hits;
1167     Odr_int approx_hits;
1168     int i;
1169     struct conf_service *service = 0;
1170     if (!s)
1171         return;
1172
1173     // We haven't counted clients yet if we're called on a block release
1174     if (active < 0)
1175         active = session_active_clients(s->psession);
1176
1177     if (start)
1178         startn = atoi(start);
1179     if (num)
1180         numn = atoi(num);
1181
1182     service = s->psession->service;
1183     if (!sort)
1184         sort = service->default_sort;
1185     if (!(sp = reclist_parse_sortparms(c->nmem, sort, service)))
1186     {
1187         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1188         return;
1189
1190     }
1191
1192     rl = show_range_start(s->psession, sp, startn, &numn, &total,
1193                           &total_hits, &approx_hits, show_records_ready, c);
1194     if (!rl)
1195         return;
1196
1197     response_open_ok(c, "show");
1198     wrbuf_printf(c->wrbuf, "\n<activeclients>%d</activeclients>\n", active);
1199     wrbuf_printf(c->wrbuf, "<merged>%d</merged>\n", total);
1200     wrbuf_printf(c->wrbuf, "<total>" ODR_INT_PRINTF "</total>\n", total_hits);
1201     if (version >= 2)
1202         wrbuf_printf(c->wrbuf, "<approximation>" ODR_INT_PRINTF
1203                      "</approximation>\n", approx_hits);
1204
1205     wrbuf_printf(c->wrbuf, "<start>%d</start>\n", startn);
1206     wrbuf_printf(c->wrbuf, "<num>%d</num>\n", numn);
1207
1208     for (i = 0; i < numn; i++)
1209     {
1210         int ccount;
1211         struct record *p;
1212         struct record_cluster *rec = rl[i];
1213         struct conf_service *service = s->psession->service;
1214
1215         wrbuf_puts(c->wrbuf, "<hit>\n");
1216         write_metadata(c->wrbuf, service, rec->metadata, flags, 1);
1217         for (ccount = 0, p = rl[i]->records; p;  p = p->next, ccount++)
1218             write_subrecord(p, c->wrbuf, service, flags, 2);
1219         wrbuf_printf(c->wrbuf, " <count>%d</count>\n", ccount);
1220         if (strstr(sort, "relevance"))
1221         {
1222             wrbuf_printf(c->wrbuf, " <relevance>%d</relevance>\n",
1223                          rec->relevance_score);
1224             if (service->rank_debug)
1225             {
1226                 wrbuf_printf(c->wrbuf, " <relevance_info>\n");
1227                 wrbuf_xmlputs(c->wrbuf, wrbuf_cstr(rec->relevance_explain1));
1228                 wrbuf_xmlputs(c->wrbuf, wrbuf_cstr(rec->relevance_explain2));
1229                 wrbuf_printf(c->wrbuf, " </relevance_info>\n");
1230             }
1231         }
1232         wrbuf_puts(c->wrbuf, " <recid>");
1233         wrbuf_xmlputs(c->wrbuf, rec->recid);
1234         wrbuf_puts(c->wrbuf, "</recid>\n");
1235         wrbuf_puts(c->wrbuf, "</hit>\n");
1236     }
1237
1238     show_range_stop(s->psession, rl);
1239
1240     response_close(c, "show");
1241 }
1242
1243 static void show_records_ready(void *data)
1244 {
1245     struct http_channel *c = (struct http_channel *) data;
1246     struct http_session *s = locate_session(c);
1247     if (s)
1248     {
1249         session_log(s->psession, c->http_sessions->log_level,
1250                     "show watch released");
1251         show_records(c, s, -1);
1252     }
1253     else {
1254         /* some error message  */
1255     }
1256     release_session(c, s);
1257 }
1258
1259 static void cmd_show(struct http_channel *c)
1260 {
1261     struct http_request  *rq = c->request;
1262     struct http_response *rs = c->response;
1263     struct http_session *s = locate_session(c);
1264     const char *block = http_argbyname(rq, "block");
1265     const char *sort = http_argbyname(rq, "sort");
1266     const char *block_error = http_argbyname(rq, "report");
1267     const char *mergekey = http_argbyname(rq, "mergekey");
1268     const char *rank = http_argbyname(rq, "rank");
1269     struct conf_service *service = 0;
1270     struct reclist_sortparms *sp;
1271     int status;
1272     int report_error = 0;
1273
1274     if (block_error && !strcmp("1", block_error))
1275         report_error = 1;
1276     if (!s)
1277         return;
1278     service = s->psession->service;
1279     if (!sort)
1280         sort = service->default_sort;
1281     if (!(sp = reclist_parse_sortparms(c->nmem, sort, service)))
1282     {
1283         error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1284         release_session(c, s);
1285         return;
1286     }
1287     session_sort(s->psession, sp, mergekey, rank);
1288
1289     status = session_active_clients(s->psession);
1290
1291     if (block && reclist_get_num_records(s->psession->reclist) == 0)
1292     {
1293         if (!strcmp(block, "preferred")
1294             && !session_is_preferred_clients_ready(s->psession)
1295             && reclist_get_num_records(s->psession->reclist) == 0)
1296         {
1297             // if there is already a watch/block. we do not block this one
1298             if (session_set_watch(s->psession, SESSION_WATCH_SHOW_PREF,
1299                                   show_records_ready, c, c) == 0)
1300             {
1301                 session_log(s->psession, c->http_sessions->log_level,
1302                             "Blocking on command show (preferred targets)");
1303                 release_session(c, s);
1304                 return;
1305             }
1306             else
1307             {
1308                 session_log(s->psession, YLOG_WARN, "Attempt to block"
1309                             " multiple times on show (preferred targets) block."
1310                             " Not supported!");
1311                 if (report_error)
1312                 {
1313                     error(rs, PAZPAR2_ALREADY_BLOCKED,
1314                           "show (preferred targets)");
1315                     release_session(c, s);
1316                     return;
1317                 }
1318                 else
1319                     session_log(s->psession, YLOG_WARN,
1320                                 "Ignoring show(preferred) block."
1321                                 " Returning current result");
1322             }
1323
1324         }
1325         else if (status)
1326         {
1327             // if there is already a watch/block. we do not block this one
1328             if (session_set_watch(s->psession, SESSION_WATCH_SHOW,
1329                                   show_records_ready, c, c) != 0)
1330             {
1331                 session_log(s->psession, YLOG_WARN, "Attempt to block"
1332                             " multiple times on show block. Not supported!");
1333                 if (report_error)
1334                 {
1335                     error(rs, PAZPAR2_ALREADY_BLOCKED, "show");
1336                     release_session(c, s);
1337                     return;
1338                 }
1339                 else
1340                     session_log(s->psession, YLOG_WARN, "Ignoring show block."
1341                                 " Returning current result");
1342             }
1343             else
1344             {
1345                 session_log(s->psession, c->http_sessions->log_level,
1346                             "Blocking on command show");
1347                 release_session(c, s);
1348                 return;
1349             }
1350         }
1351     }
1352     show_records(c, s, status);
1353     release_session(c, s);
1354 }
1355
1356 static void cmd_ping(struct http_channel *c)
1357 {
1358     struct http_session *s = locate_session(c);
1359     if (!s)
1360         return;
1361     response_open_ok(c, "ping");
1362     response_close(c, "ping");
1363     release_session(c, s);
1364 }
1365
1366 static void cmd_search(struct http_channel *c)
1367 {
1368     struct http_request *rq = c->request;
1369     struct http_response *rs = c->response;
1370     struct http_session *s = locate_session(c);
1371     const char *query = http_argbyname(rq, "query");
1372     const char *filter = http_argbyname(rq, "filter");
1373     const char *maxrecs = http_argbyname(rq, "maxrecs");
1374     const char *startrecs = http_argbyname(rq, "startrecs");
1375     const char *limit = http_argbyname(rq, "limit");
1376     const char *sort = http_argbyname(rq, "sort");
1377     const char *mergekey = http_argbyname(rq, "mergekey");
1378     const char *rank = http_argbyname(rq, "rank");
1379     enum pazpar2_error_code code;
1380     const char *addinfo = 0;
1381     const char *addinfo2 = 0;
1382     struct reclist_sortparms *sp;
1383     struct conf_service *service = 0;
1384
1385     if (!s)
1386         return;
1387
1388     if (!query)
1389     {
1390         error(rs, PAZPAR2_MISSING_PARAMETER, "query");
1391         release_session(c, s);
1392         return;
1393     }
1394     if (!yaz_utf8_check(query))
1395     {
1396         error(rs, PAZPAR2_MALFORMED_PARAMETER_ENCODING, "query");
1397         release_session(c, s);
1398         return;
1399     }
1400     service = s->psession->service;
1401     if (!sort)
1402         sort = service->default_sort;
1403
1404     if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
1405     {
1406         error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1407         release_session(c, s);
1408         return;
1409     }
1410
1411     code = session_search(s->psession, query, startrecs, maxrecs, filter, limit,
1412                           &addinfo, &addinfo2, sp, mergekey, rank);
1413     if (code)
1414     {
1415         error2(rs, code, addinfo, addinfo2);
1416         release_session(c, s);
1417         return;
1418     }
1419     response_open_ok(c, "search");
1420     response_close(c, "search");
1421     release_session(c, s);
1422 }
1423
1424
1425 static void cmd_stat(struct http_channel *c)
1426 {
1427     struct http_session *s = locate_session(c);
1428     struct statistics stat;
1429     int clients;
1430
1431     float progress = 0;
1432
1433     if (!s)
1434         return;
1435
1436     clients = session_active_clients(s->psession);
1437     statistics(s->psession, &stat);
1438
1439     if (stat.num_clients > 0)
1440     {
1441         progress = (stat.num_clients  - clients) / (float)stat.num_clients;
1442     }
1443
1444     response_open_command(c, "stat");
1445     wrbuf_printf(c->wrbuf, "\n <activeclients>%d</activeclients>\n", clients);
1446     wrbuf_printf(c->wrbuf, " <hits>" ODR_INT_PRINTF "</hits>\n", stat.num_hits);
1447     wrbuf_printf(c->wrbuf, " <records>%d</records>\n", stat.num_records);
1448     wrbuf_printf(c->wrbuf, " <clients>%d</clients>\n", stat.num_clients);
1449     wrbuf_printf(c->wrbuf, " <unconnected>%d</unconnected>\n", stat.num_no_connection);
1450     wrbuf_printf(c->wrbuf, " <connecting>%d</connecting>\n", stat.num_connecting);
1451     wrbuf_printf(c->wrbuf, " <working>%d</working>\n", stat.num_working);
1452     wrbuf_printf(c->wrbuf, " <idle>%d</idle>\n", stat.num_idle);
1453     wrbuf_printf(c->wrbuf, " <failed>%d</failed>\n", stat.num_failed);
1454     wrbuf_printf(c->wrbuf, " <error>%d</error>\n", stat.num_error);
1455     wrbuf_printf(c->wrbuf, " <progress>%.2f</progress>\n", progress);
1456     response_close(c, "stat");
1457     release_session(c, s);
1458 }
1459
1460 static void cmd_stop(struct http_channel *c)
1461 {
1462     struct http_session *s = locate_session(c);
1463     if (!s)
1464         return;
1465     response_open_ok(c, "stop");
1466     session_stop(s->psession);
1467     response_close(c, "stop");
1468     release_session(c, s);
1469 }
1470
1471 static void cmd_info(struct http_channel *c)
1472 {
1473     char yaz_version_str[20];
1474     char yaz_sha1_str[42];
1475
1476     response_open_command(c, "info");
1477     wrbuf_puts(c->wrbuf, "\n <version>\n");
1478     wrbuf_puts(c->wrbuf, "  <pazpar2");
1479 #ifdef PAZPAR2_VERSION_SHA1
1480     wrbuf_printf(c->wrbuf, " sha1=\"%s\"", PAZPAR2_VERSION_SHA1);
1481 #endif
1482     wrbuf_puts(c->wrbuf, ">");
1483     wrbuf_xmlputs(c->wrbuf, VERSION);
1484     wrbuf_puts(c->wrbuf, "</pazpar2>\n");
1485
1486     yaz_version(yaz_version_str, yaz_sha1_str);
1487     wrbuf_puts(c->wrbuf, "  <yaz compiled=\"");
1488     wrbuf_xmlputs(c->wrbuf, YAZ_VERSION);
1489     wrbuf_puts(c->wrbuf, "\" sha1=\"");
1490     wrbuf_xmlputs(c->wrbuf, yaz_sha1_str);
1491     wrbuf_puts(c->wrbuf, "\">");
1492     wrbuf_xmlputs(c->wrbuf, yaz_version_str);
1493     wrbuf_puts(c->wrbuf, "</yaz>\n");
1494
1495     wrbuf_puts(c->wrbuf, " </version>\n");
1496 #if HAVE_UNISTD_H
1497     {
1498         char hostname_str[64];
1499         if (gethostname(hostname_str, sizeof(hostname_str)) == 0)
1500         {
1501             wrbuf_puts(c->wrbuf, " <host>");
1502             wrbuf_xmlputs(c->wrbuf, hostname_str);
1503             wrbuf_puts(c->wrbuf, "</host>\n");
1504         }
1505     }
1506 #endif
1507     info_services(c->server, c->wrbuf);
1508
1509     response_close(c, "info");
1510 }
1511
1512 struct {
1513     char *name;
1514     void (*fun)(struct http_channel *c);
1515 } commands[] = {
1516     { "init", cmd_init },
1517     { "settings", cmd_settings },
1518     { "stat", cmd_stat },
1519     { "bytarget", cmd_bytarget },
1520     { "show", cmd_show },
1521     { "search", cmd_search },
1522     { "termlist", cmd_termlist },
1523     { "exit", cmd_exit },
1524     { "session-status", cmd_session_status },
1525     { "server-status", cmd_server_status },
1526     { "service", cmd_service },
1527     { "ping", cmd_ping },
1528     { "record", cmd_record },
1529     { "info", cmd_info },
1530     { "stop", cmd_stop },
1531     {0,0}
1532 };
1533
1534 void http_command(struct http_channel *c)
1535 {
1536     const char *command = http_argbyname(c->request, "command");
1537     struct http_response *rs = http_create_response(c);
1538     int i;
1539
1540     c->response = rs;
1541
1542     http_addheader(rs, "Expires", "Thu, 19 Nov 1981 08:52:00 GMT");
1543     http_addheader(rs, "Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
1544
1545     if (!command)
1546     {
1547         error(rs, PAZPAR2_MISSING_PARAMETER, "command");
1548         return;
1549     }
1550     for (i = 0; commands[i].name; i++)
1551         if (!strcmp(commands[i].name, command))
1552         {
1553             (*commands[i].fun)(c);
1554             break;
1555         }
1556     if (!commands[i].name)
1557         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "command");
1558
1559     return;
1560 }
1561
1562 /*
1563  * Local variables:
1564  * c-basic-offset: 4
1565  * c-file-style: "Stroustrup"
1566  * indent-tabs-mode: nil
1567  * End:
1568  * vim: shiftwidth=4 tabstop=8 expandtab
1569  */
1570