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         if (ht[i].query_data)
 813         {
 814             wrbuf_puts(c->wrbuf, "<query_type>");
 815             wrbuf_xmlputs(c->wrbuf, ht[i].query_type);
 816             wrbuf_puts(c->wrbuf, "</query_type>\n");
 817             wrbuf_puts(c->wrbuf, "<query_data>");
 818             wrbuf_xmlputs(c->wrbuf, ht[i].query_data);
 819             wrbuf_puts(c->wrbuf, "</query_data>\n");
 820         }
 821         wrbuf_puts(c->wrbuf, "</target>");
 822     }
 823     response_close(c, "bytarget");
 824 }
 825
 826 static void bytarget_result_ready(void *data)
 827 {
 828     struct http_channel *c = (struct http_channel *) data;
 829     struct http_session *s = locate_session(c);
 830     const char *status_message = "OK";
 831     if (s)
 832     {
 833         session_log(s->psession, c->http_sessions->log_level,
 834                     "bytarget watch released");
 835         bytarget_response(c, s, status_message);
 836         release_session(c, s);
 837     }
 838     else
 839         yaz_log(c->http_sessions->log_level,
 840                 "No Session found for released bytarget watch");
 841 }
 842
 843
 844 static void cmd_bytarget(struct http_channel *c)
 845 {
 846     struct http_request *rq = c->request;
 847     struct http_response *rs = c->response;
 848     struct http_session *s = locate_session(c);
 849     const char *block = http_argbyname(rq, "block");
 850     const char *report = http_argbyname(rq, "report");
 851     int report_error = 0;
 852     int report_status = 0;
 853     const char *status_message = "OK";
 854     int no_active;
 855
 856     if (report && !strcmp("error", report))
 857         report_error = 1;
 858     if (report && !strcmp("status", report))
 859         report_status = 1;
 860
 861     if (!s)
 862         return;
 863
 864     no_active = session_active_clients(s->psession);
 865     if (block && !strcmp("1", block) && no_active)
 866     {
 867         // if there is already a watch/block. we do not block this one
 868         if (session_set_watch(s->psession, SESSION_WATCH_BYTARGET,
 869                               bytarget_result_ready, c, c) != 0)
 870         {
 871             session_log(s->psession, YLOG_WARN, "Attempt to block "
 872                         "multiple times on bytarget block. Not supported!");
 873             if (report_error)
 874             {
 875                 error(rs, PAZPAR2_ALREADY_BLOCKED, "bytarget");
 876                 release_session(c, s);
 877                 return;
 878             }
 879             else if (report_status)
 880                 status_message = "WARNING (Already blocked on bytarget)";
 881             else
 882                 session_log(s->psession, YLOG_WARN, "Ignoring bytarget block."
 883                             " Return current result.");
 884         }
 885         else
 886         {
 887             session_log(s->psession, c->http_sessions->log_level,
 888                         "Blocking on command bytarget");
 889             release_session(c, s);
 890             return;
 891         }
 892     }
 893     bytarget_response(c, s, status_message);
 894     release_session(c, s);
 895 }
 896
 897 static void write_metadata(WRBUF w, struct conf_service *service,
 898                            struct record_metadata **ml, unsigned flags,
 899                            int indent)
 900 {
 901     int imeta;
 902
 903     for (imeta = 0; imeta < service->num_metadata; imeta++)
 904     {
 905         struct conf_metadata *cmd = &service->metadata[imeta];
 906         struct record_metadata *md;
 907         if (!cmd->brief && !(flags & 1))
 908             continue;
 909         for (md = ml[imeta]; md; md = md->next)
 910         {
 911             struct record_metadata_attr *attr = md->attributes;
 912             int i;
 913             for (i = 0; i < indent; i++)
 914                 wrbuf_putc(w, ' ');
 915             wrbuf_printf(w, "<md-%s", cmd->name);
 916
 917             for (; attr; attr = attr->next)
 918             {
 919                 wrbuf_printf(w, " %s=\"", attr->name);
 920                 wrbuf_xmlputs(w, attr->value);
 921                 wrbuf_puts(w, "\"");
 922             }
 923             wrbuf_puts(w, ">");
 924             switch (cmd->type)
 925             {
 926                 case Metadata_type_generic:
 927                     if (md->data.text.snippet && (flags & 2))
 928                         wrbuf_puts(w, md->data.text.snippet);
 929                     else
 930                         wrbuf_xmlputs(w, md->data.text.disp);
 931                     break;
 932                 case Metadata_type_year:
 933                     wrbuf_printf(w, "%d", md->data.number.min);
 934                     if (md->data.number.min != md->data.number.max)
 935                         wrbuf_printf(w, "-%d", md->data.number.max);
 936                     break;
 937                 case Metadata_type_float:
 938                     wrbuf_printf(w, "%f", md->data.fnumber);
 939                     break;
 940                 default:
 941                     wrbuf_puts(w, "[can't represent]");
 942                     break;
 943             }
 944             wrbuf_printf(w, "</md-%s>\n", cmd->name);
 945         }
 946     }
 947 }
 948
 949 static void write_subrecord(struct record *r, WRBUF w,
 950                             struct conf_service *service, unsigned flags,
 951                             int indent)
 952 {
 953     const char *name = session_setting_oneval(
 954         client_get_database(r->client), PZ_NAME);
 955
 956     wrbuf_puts(w, " <location id=\"");
 957     wrbuf_xmlputs(w, client_get_id(r->client));
 958     wrbuf_puts(w, "\"\n");
 959
 960     wrbuf_puts(w, "    name=\"");
 961     wrbuf_xmlputs(w,  *name ? name : "Unknown");
 962     wrbuf_puts(w, "\" ");
 963
 964     wrbuf_puts(w, "checksum=\"");
 965     wrbuf_printf(w,  "%u", r->checksum);
 966     wrbuf_puts(w, "\">\n");
 967
 968     write_metadata(w, service, r->metadata, flags, indent);
 969     wrbuf_puts(w, " </location>\n");
 970 }
 971
 972 static void show_raw_record_error(void *data, const char *addinfo)
 973 {
 974     http_channel_observer_t obs = data;
 975     struct http_channel *c = http_channel_observer_chan(obs);
 976     struct http_response *rs = c->response;
 977
 978     http_remove_observer(obs);
 979
 980     error(rs, PAZPAR2_RECORD_FAIL, addinfo);
 981 }
 982
 983 static void show_raw_record_ok(void *data, const char *buf, size_t sz)
 984 {
 985     http_channel_observer_t obs = data;
 986     struct http_channel *c = http_channel_observer_chan(obs);
 987     struct http_response *rs = c->response;
 988
 989     http_remove_observer(obs);
 990
 991     wrbuf_write(c->wrbuf, buf, sz);
 992     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 993     http_send_response(c);
 994 }
 995
 996
 997 static void show_raw_record_ok_binary(void *data, const char *buf, size_t sz)
 998 {
 999     http_channel_observer_t obs = data;
1000     struct http_channel *c = http_channel_observer_chan(obs);
1001     struct http_response *rs = c->response;
1002
1003     http_remove_observer(obs);
1004
1005     wrbuf_write(c->wrbuf, buf, sz);
1006     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
1007
1008     rs->content_type = "application/octet-stream";
1009     http_send_response(c);
1010 }
1011
1012
1013 void show_raw_reset(void *data, struct http_channel *c, void *data2)
1014 {
1015     //struct client *client = data;
1016     //client_show_raw_remove(client, data2);
1017 }
1018
1019 static void cmd_record_ready(void *data);
1020
1021 static void show_record(struct http_channel *c, struct http_session *s)
1022 {
1023     struct http_response *rs = c->response;
1024     struct http_request *rq = c->request;
1025     struct record_cluster *rec, *prev_r, *next_r;
1026     struct conf_service *service;
1027     const char *idstr = http_argbyname(rq, "id");
1028     const char *offsetstr = http_argbyname(rq, "offset");
1029     const char *binarystr = http_argbyname(rq, "binary");
1030     const char *checksumstr = http_argbyname(rq, "checksum");
1031     const char *snippets = http_argbyname(rq, "snippets");
1032     unsigned flags = (snippets && *snippets == '1') ? 3 : 1;
1033
1034     if (!s)
1035         return;
1036     service = s->psession->service;
1037     if (!idstr)
1038     {
1039         error(rs, PAZPAR2_MISSING_PARAMETER, "id");
1040         return;
1041     }
1042     wrbuf_rewind(c->wrbuf);
1043     if (!(rec = show_single_start(s->psession, idstr, &prev_r, &next_r)))
1044     {
1045         if (session_active_clients(s->psession) == 0)
1046         {
1047             error(rs, PAZPAR2_RECORD_MISSING, idstr);
1048         }
1049         else if (session_set_watch(s->psession, SESSION_WATCH_RECORD,
1050                               cmd_record_ready, c, c) != 0)
1051         {
1052             error(rs, PAZPAR2_RECORD_MISSING, idstr);
1053         }
1054         return;
1055     }
1056     if (offsetstr || checksumstr)
1057     {
1058         const char *syntax = http_argbyname(rq, "syntax");
1059         const char *esn = http_argbyname(rq, "esn");
1060         int i;
1061         struct record*r = rec->records;
1062         int binary = 0;
1063         const char *nativesyntax = http_argbyname(rq, "nativesyntax");
1064
1065         if (binarystr && *binarystr != '0')
1066             binary = 1;
1067
1068         if (checksumstr)
1069         {
1070             unsigned v = strtoul(checksumstr, 0, 10);
1071             for (i = 0; r; r = r->next)
1072                 if (v == r->checksum)
1073                     break;
1074             if (!r)
1075                 error(rs, PAZPAR2_RECORD_FAIL, "no record");
1076         }
1077         else
1078         {
1079             int offset = atoi(offsetstr);
1080             for (i = 0; i < offset && r; r = r->next, i++)
1081                 ;
1082             if (!r)
1083                 error(rs, PAZPAR2_RECORD_FAIL, "no record at offset given");
1084         }
1085         if (r)
1086         {
1087             http_channel_observer_t obs =
1088                 http_add_observer(c, r->client, show_raw_reset);
1089             int ret = client_show_raw_begin(r->client, r->position,
1090                                             syntax, esn,
1091                                             obs /* data */,
1092                                             show_raw_record_error,
1093                                             (binary ?
1094                                              show_raw_record_ok_binary :
1095                                              show_raw_record_ok),
1096                                             (binary ? 1 : 0),
1097                                             nativesyntax);
1098             if (ret == -1)
1099             {
1100                 http_remove_observer(obs);
1101                 error(rs, PAZPAR2_NO_SESSION, 0);
1102             }
1103         }
1104     }
1105     else
1106     {
1107         struct record *r;
1108         response_open_command(c, "record");
1109         wrbuf_puts(c->wrbuf, "\n <recid>");
1110         wrbuf_xmlputs(c->wrbuf, rec->recid);
1111         wrbuf_puts(c->wrbuf, "</recid>\n");
1112         if (prev_r)
1113         {
1114             wrbuf_puts(c->wrbuf, " <prevrecid>");
1115             wrbuf_xmlputs(c->wrbuf, prev_r->recid);
1116             wrbuf_puts(c->wrbuf, "</prevrecid>\n");
1117         }
1118         if (next_r)
1119         {
1120             wrbuf_puts(c->wrbuf, " <nextrecid>");
1121             wrbuf_xmlputs(c->wrbuf, next_r->recid);
1122             wrbuf_puts(c->wrbuf, "</nextrecid>\n");
1123         }
1124         wrbuf_printf(c->wrbuf, " <activeclients>%d</activeclients>\n",
1125                      session_active_clients(s->psession));
1126         write_metadata(c->wrbuf, service, rec->metadata, flags, 1);
1127         for (r = rec->records; r; r = r->next)
1128             write_subrecord(r, c->wrbuf, service, flags, 2);
1129         response_close(c, "record");
1130     }
1131     show_single_stop(s->psession, rec);
1132 }
1133
1134 static void cmd_record_ready(void *data)
1135 {
1136     struct http_channel *c = (struct http_channel *) data;
1137     struct http_session *s = locate_session(c);
1138     if (s)
1139     {
1140         session_log(s->psession, c->http_sessions->log_level,
1141                     "record watch released");
1142         show_record(c, s);
1143         release_session(c, s);
1144     }
1145 }
1146
1147 static void cmd_record(struct http_channel *c)
1148 {
1149     struct http_session *s = locate_session(c);
1150     if (s)
1151     {
1152         show_record(c, s);
1153         release_session(c, s);
1154     }
1155 }
1156
1157
1158 static void show_records(struct http_channel *c, struct http_session *s,
1159                          int active)
1160 {
1161     struct http_request *rq = c->request;
1162     struct http_response *rs = c->response;
1163     struct record_cluster **rl;
1164     struct reclist_sortparms *sp;
1165     const char *start = http_argbyname(rq, "start");
1166     const char *num = http_argbyname(rq, "num");
1167     const char *sort = http_argbyname(rq, "sort");
1168     int version = get_version(rq);
1169     const char *snippets = http_argbyname(rq, "snippets");
1170     unsigned flags = (snippets && *snippets == '1') ? 2 : 0;
1171
1172     int startn = 0;
1173     int numn = 20;
1174     int total;
1175     Odr_int total_hits;
1176     Odr_int approx_hits;
1177     int i;
1178     struct conf_service *service = 0;
1179     if (!s)
1180         return;
1181
1182     // We haven't counted clients yet if we're called on a block release
1183     if (active < 0)
1184         active = session_active_clients(s->psession);
1185
1186     if (start)
1187         startn = atoi(start);
1188     if (num)
1189         numn = atoi(num);
1190
1191     service = s->psession->service;
1192     if (!sort)
1193         sort = service->default_sort;
1194     if (!(sp = reclist_parse_sortparms(c->nmem, sort, service)))
1195     {
1196         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1197         return;
1198
1199     }
1200
1201     rl = show_range_start(s->psession, sp, startn, &numn, &total,
1202                           &total_hits, &approx_hits, show_records_ready, c);
1203     if (!rl)
1204         return;
1205
1206     response_open_ok(c, "show");
1207     wrbuf_printf(c->wrbuf, "\n<activeclients>%d</activeclients>\n", active);
1208     wrbuf_printf(c->wrbuf, "<merged>%d</merged>\n", total);
1209     wrbuf_printf(c->wrbuf, "<total>" ODR_INT_PRINTF "</total>\n", total_hits);
1210     if (version >= 2)
1211         wrbuf_printf(c->wrbuf, "<approximation>" ODR_INT_PRINTF
1212                      "</approximation>\n", approx_hits);
1213
1214     wrbuf_printf(c->wrbuf, "<start>%d</start>\n", startn);
1215     wrbuf_printf(c->wrbuf, "<num>%d</num>\n", numn);
1216
1217     for (i = 0; i < numn; i++)
1218     {
1219         int ccount;
1220         struct record *p;
1221         struct record_cluster *rec = rl[i];
1222         struct conf_service *service = s->psession->service;
1223
1224         wrbuf_puts(c->wrbuf, "<hit>\n");
1225         write_metadata(c->wrbuf, service, rec->metadata, flags, 1);
1226         for (ccount = 0, p = rl[i]->records; p;  p = p->next, ccount++)
1227             write_subrecord(p, c->wrbuf, service, flags, 2);
1228         wrbuf_printf(c->wrbuf, " <count>%d</count>\n", ccount);
1229         if (strstr(sort, "relevance"))
1230         {
1231             wrbuf_printf(c->wrbuf, " <relevance>%d</relevance>\n",
1232                          rec->relevance_score);
1233             if (service->rank_debug)
1234             {
1235                 wrbuf_printf(c->wrbuf, " <relevance_info>\n");
1236                 wrbuf_xmlputs(c->wrbuf, wrbuf_cstr(rec->relevance_explain1));
1237                 wrbuf_xmlputs(c->wrbuf, wrbuf_cstr(rec->relevance_explain2));
1238                 wrbuf_printf(c->wrbuf, " </relevance_info>\n");
1239             }
1240         }
1241         wrbuf_puts(c->wrbuf, " <recid>");
1242         wrbuf_xmlputs(c->wrbuf, rec->recid);
1243         wrbuf_puts(c->wrbuf, "</recid>\n");
1244         wrbuf_puts(c->wrbuf, "</hit>\n");
1245     }
1246
1247     show_range_stop(s->psession, rl);
1248
1249     response_close(c, "show");
1250 }
1251
1252 static void show_records_ready(void *data)
1253 {
1254     struct http_channel *c = (struct http_channel *) data;
1255     struct http_session *s = locate_session(c);
1256     if (s)
1257     {
1258         session_log(s->psession, c->http_sessions->log_level,
1259                     "show watch released");
1260         show_records(c, s, -1);
1261     }
1262     else {
1263         /* some error message  */
1264     }
1265     release_session(c, s);
1266 }
1267
1268 static void cmd_show(struct http_channel *c)
1269 {
1270     struct http_request  *rq = c->request;
1271     struct http_response *rs = c->response;
1272     struct http_session *s = locate_session(c);
1273     const char *block = http_argbyname(rq, "block");
1274     const char *sort = http_argbyname(rq, "sort");
1275     const char *block_error = http_argbyname(rq, "report");
1276     const char *mergekey = http_argbyname(rq, "mergekey");
1277     const char *rank = http_argbyname(rq, "rank");
1278     struct conf_service *service = 0;
1279     struct reclist_sortparms *sp;
1280     int status;
1281     int report_error = 0;
1282
1283     if (block_error && !strcmp("1", block_error))
1284         report_error = 1;
1285     if (!s)
1286         return;
1287     service = s->psession->service;
1288     if (!sort)
1289         sort = service->default_sort;
1290     if (!(sp = reclist_parse_sortparms(c->nmem, sort, service)))
1291     {
1292         error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1293         release_session(c, s);
1294         return;
1295     }
1296     session_sort(s->psession, sp, mergekey, rank);
1297
1298     status = session_active_clients(s->psession);
1299
1300     if (block && reclist_get_num_records(s->psession->reclist) == 0)
1301     {
1302         if (!strcmp(block, "preferred")
1303             && !session_is_preferred_clients_ready(s->psession)
1304             && reclist_get_num_records(s->psession->reclist) == 0)
1305         {
1306             // if there is already a watch/block. we do not block this one
1307             if (session_set_watch(s->psession, SESSION_WATCH_SHOW_PREF,
1308                                   show_records_ready, c, c) == 0)
1309             {
1310                 session_log(s->psession, c->http_sessions->log_level,
1311                             "Blocking on command show (preferred targets)");
1312                 release_session(c, s);
1313                 return;
1314             }
1315             else
1316             {
1317                 session_log(s->psession, YLOG_WARN, "Attempt to block"
1318                             " multiple times on show (preferred targets) block."
1319                             " Not supported!");
1320                 if (report_error)
1321                 {
1322                     error(rs, PAZPAR2_ALREADY_BLOCKED,
1323                           "show (preferred targets)");
1324                     release_session(c, s);
1325                     return;
1326                 }
1327                 else
1328                     session_log(s->psession, YLOG_WARN,
1329                                 "Ignoring show(preferred) block."
1330                                 " Returning current result");
1331             }
1332
1333         }
1334         else if (status)
1335         {
1336             // if there is already a watch/block. we do not block this one
1337             if (session_set_watch(s->psession, SESSION_WATCH_SHOW,
1338                                   show_records_ready, c, c) != 0)
1339             {
1340                 session_log(s->psession, YLOG_WARN, "Attempt to block"
1341                             " multiple times on show block. Not supported!");
1342                 if (report_error)
1343                 {
1344                     error(rs, PAZPAR2_ALREADY_BLOCKED, "show");
1345                     release_session(c, s);
1346                     return;
1347                 }
1348                 else
1349                     session_log(s->psession, YLOG_WARN, "Ignoring show block."
1350                                 " Returning current result");
1351             }
1352             else
1353             {
1354                 session_log(s->psession, c->http_sessions->log_level,
1355                             "Blocking on command show");
1356                 release_session(c, s);
1357                 return;
1358             }
1359         }
1360     }
1361     show_records(c, s, status);
1362     release_session(c, s);
1363 }
1364
1365 static void cmd_ping(struct http_channel *c)
1366 {
1367     struct http_session *s = locate_session(c);
1368     if (!s)
1369         return;
1370     response_open_ok(c, "ping");
1371     response_close(c, "ping");
1372     release_session(c, s);
1373 }
1374
1375 static void cmd_search(struct http_channel *c)
1376 {
1377     struct http_request *rq = c->request;
1378     struct http_response *rs = c->response;
1379     struct http_session *s = locate_session(c);
1380     const char *query = http_argbyname(rq, "query");
1381     const char *filter = http_argbyname(rq, "filter");
1382     const char *maxrecs = http_argbyname(rq, "maxrecs");
1383     const char *startrecs = http_argbyname(rq, "startrecs");
1384     const char *limit = http_argbyname(rq, "limit");
1385     const char *sort = http_argbyname(rq, "sort");
1386     const char *mergekey = http_argbyname(rq, "mergekey");
1387     const char *rank = http_argbyname(rq, "rank");
1388     enum pazpar2_error_code code;
1389     const char *addinfo = 0;
1390     const char *addinfo2 = 0;
1391     struct reclist_sortparms *sp;
1392     struct conf_service *service = 0;
1393
1394     if (!s)
1395         return;
1396
1397     if (!query)
1398     {
1399         error(rs, PAZPAR2_MISSING_PARAMETER, "query");
1400         release_session(c, s);
1401         return;
1402     }
1403     if (!yaz_utf8_check(query))
1404     {
1405         error(rs, PAZPAR2_MALFORMED_PARAMETER_ENCODING, "query");
1406         release_session(c, s);
1407         return;
1408     }
1409     service = s->psession->service;
1410     if (!sort)
1411         sort = service->default_sort;
1412
1413     if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
1414     {
1415         error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1416         release_session(c, s);
1417         return;
1418     }
1419
1420     code = session_search(s->psession, query, startrecs, maxrecs, filter, limit,
1421                           &addinfo, &addinfo2, sp, mergekey, rank);
1422     if (code)
1423     {
1424         error2(rs, code, addinfo, addinfo2);
1425         release_session(c, s);
1426         return;
1427     }
1428     response_open_ok(c, "search");
1429     response_close(c, "search");
1430     release_session(c, s);
1431 }
1432
1433
1434 static void cmd_stat(struct http_channel *c)
1435 {
1436     struct http_session *s = locate_session(c);
1437     struct statistics stat;
1438     int clients;
1439
1440     float progress = 0;
1441
1442     if (!s)
1443         return;
1444
1445     clients = session_active_clients(s->psession);
1446     statistics(s->psession, &stat);
1447
1448     if (stat.num_clients > 0)
1449     {
1450         progress = (stat.num_clients  - clients) / (float)stat.num_clients;
1451     }
1452
1453     response_open_command(c, "stat");
1454     wrbuf_printf(c->wrbuf, "\n <activeclients>%d</activeclients>\n", clients);
1455     wrbuf_printf(c->wrbuf, " <hits>" ODR_INT_PRINTF "</hits>\n", stat.num_hits);
1456     wrbuf_printf(c->wrbuf, " <records>%d</records>\n", stat.num_records);
1457     wrbuf_printf(c->wrbuf, " <clients>%d</clients>\n", stat.num_clients);
1458     wrbuf_printf(c->wrbuf, " <unconnected>%d</unconnected>\n", stat.num_no_connection);
1459     wrbuf_printf(c->wrbuf, " <connecting>%d</connecting>\n", stat.num_connecting);
1460     wrbuf_printf(c->wrbuf, " <working>%d</working>\n", stat.num_working);
1461     wrbuf_printf(c->wrbuf, " <idle>%d</idle>\n", stat.num_idle);
1462     wrbuf_printf(c->wrbuf, " <failed>%d</failed>\n", stat.num_failed);
1463     wrbuf_printf(c->wrbuf, " <error>%d</error>\n", stat.num_error);
1464     wrbuf_printf(c->wrbuf, " <progress>%.2f</progress>\n", progress);
1465     response_close(c, "stat");
1466     release_session(c, s);
1467 }
1468
1469 static void cmd_stop(struct http_channel *c)
1470 {
1471     struct http_session *s = locate_session(c);
1472     if (!s)
1473         return;
1474     response_open_ok(c, "stop");
1475     session_stop(s->psession);
1476     response_close(c, "stop");
1477     release_session(c, s);
1478 }
1479
1480 static void cmd_info(struct http_channel *c)
1481 {
1482     char yaz_version_str[20];
1483     char yaz_sha1_str[42];
1484
1485     response_open_command(c, "info");
1486     wrbuf_puts(c->wrbuf, "\n <version>\n");
1487     wrbuf_puts(c->wrbuf, "  <pazpar2");
1488 #ifdef PAZPAR2_VERSION_SHA1
1489     wrbuf_printf(c->wrbuf, " sha1=\"%s\"", PAZPAR2_VERSION_SHA1);
1490 #endif
1491     wrbuf_puts(c->wrbuf, ">");
1492     wrbuf_xmlputs(c->wrbuf, VERSION);
1493     wrbuf_puts(c->wrbuf, "</pazpar2>\n");
1494
1495     yaz_version(yaz_version_str, yaz_sha1_str);
1496     wrbuf_puts(c->wrbuf, "  <yaz compiled=\"");
1497     wrbuf_xmlputs(c->wrbuf, YAZ_VERSION);
1498     wrbuf_puts(c->wrbuf, "\" sha1=\"");
1499     wrbuf_xmlputs(c->wrbuf, yaz_sha1_str);
1500     wrbuf_puts(c->wrbuf, "\">");
1501     wrbuf_xmlputs(c->wrbuf, yaz_version_str);
1502     wrbuf_puts(c->wrbuf, "</yaz>\n");
1503
1504     wrbuf_puts(c->wrbuf, " </version>\n");
1505 #if HAVE_UNISTD_H
1506     {
1507         char hostname_str[64];
1508         if (gethostname(hostname_str, sizeof(hostname_str)) == 0)
1509         {
1510             wrbuf_puts(c->wrbuf, " <host>");
1511             wrbuf_xmlputs(c->wrbuf, hostname_str);
1512             wrbuf_puts(c->wrbuf, "</host>\n");
1513         }
1514     }
1515 #endif
1516     info_services(c->server, c->wrbuf);
1517
1518     response_close(c, "info");
1519 }
1520
1521 struct {
1522     char *name;
1523     void (*fun)(struct http_channel *c);
1524 } commands[] = {
1525     { "init", cmd_init },
1526     { "settings", cmd_settings },
1527     { "stat", cmd_stat },
1528     { "bytarget", cmd_bytarget },
1529     { "show", cmd_show },
1530     { "search", cmd_search },
1531     { "termlist", cmd_termlist },
1532     { "exit", cmd_exit },
1533     { "session-status", cmd_session_status },
1534     { "server-status", cmd_server_status },
1535     { "service", cmd_service },
1536     { "ping", cmd_ping },
1537     { "record", cmd_record },
1538     { "info", cmd_info },
1539     { "stop", cmd_stop },
1540     {0,0}
1541 };
1542
1543 void http_command(struct http_channel *c)
1544 {
1545     const char *command = http_argbyname(c->request, "command");
1546     struct http_response *rs = http_create_response(c);
1547     int i;
1548
1549     c->response = rs;
1550
1551     http_addheader(rs, "Expires", "Thu, 19 Nov 1981 08:52:00 GMT");
1552     http_addheader(rs, "Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
1553
1554     if (!command)
1555     {
1556         error(rs, PAZPAR2_MISSING_PARAMETER, "command");
1557         return;
1558     }
1559     for (i = 0; commands[i].name; i++)
1560         if (!strcmp(commands[i].name, command))
1561         {
1562             (*commands[i].fun)(c);
1563             break;
1564         }
1565     if (!commands[i].name)
1566         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "command");
1567
1568     return;
1569 }
1570
1571 /*
1572  * Local variables:
1573  * c-basic-offset: 4
1574  * c-file-style: "Stroustrup"
1575  * indent-tabs-mode: nil
1576  * End:
1577  * vim: shiftwidth=4 tabstop=8 expandtab
1578  */
1579