src/http_command.c

   1 /* This file is part of Pazpar2.
   2    Copyright (C) 2006-2012 Index Data
   3
   4 Pazpar2 is free software; you can redistribute it and/or modify it under
   5 the terms of the GNU General Public License as published by the Free
   6 Software Foundation; either version 2, or (at your option) any later
   7 version.
   8
   9 Pazpar2 is distributed in the hope that it will be useful, but WITHOUT ANY
  10 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17
  18 */
  19
  20 #if HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23 #include <stdio.h>
  24 #include <sys/types.h>
  25 #if HAVE_UNISTD_H
  26 #include <unistd.h>
  27 #endif
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #if HAVE_SYS_TIME_H
  31 #include <sys/time.h>
  32 #endif
  33 #include <yaz/snprintf.h>
  34 #include <yaz/yaz-util.h>
  35
  36 #include "ppmutex.h"
  37 #include "eventl.h"
  38 #include "parameters.h"
  39 #include "session.h"
  40 #include "http.h"
  41 #include "settings.h"
  42 #include "client.h"
  43
  44 #ifdef HAVE_MALLINFO
  45 #include <malloc.h>
  46
  47 void print_meminfo(WRBUF wrbuf)
  48 {
  49     struct mallinfo minfo;
  50     minfo = mallinfo();
  51     wrbuf_printf(wrbuf, "  <memory>\n"
  52                         "   <arena>%d</arena>\n"
  53                         "   <uordblks>%d</uordblks>\n"
  54                         "   <fordblks>%d</fordblks>\n"
  55                         "   <ordblks>%d</ordblks>\n"
  56                         "   <keepcost>%d</keepcost>\n"
  57                         "   <hblks>%d</hblks>\n"
  58                         "   <hblkhd>%d</hblkhd>\n"
  59                         "   <virt>%d</virt>\n"
  60                         "   <virtuse>%d</virtuse>\n"
  61                         "  </memory>\n",
  62                  minfo.arena, minfo.uordblks, minfo.fordblks,minfo.ordblks, minfo.keepcost, minfo.hblks, minfo.hblkhd, minfo.arena + minfo.hblkhd, minfo.uordblks + minfo.hblkhd);
  63
  64 }
  65 #else
  66 #define print_meminfo(x)
  67 #endif
  68
  69
  70 // Update this when the protocol changes
  71 #define PAZPAR2_PROTOCOL_VERSION "1"
  72
  73 #define HTTP_COMMAND_RESPONSE_PREFIX "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
  74
  75 struct http_session {
  76     IOCHAN timeout_iochan;     // NOTE: This is NOT associated with a socket
  77     struct session *psession;
  78     unsigned int session_id;
  79     int timestamp;
  80     int destroy_counter;
  81     int activity_counter;
  82     NMEM nmem;
  83     http_sessions_t http_sessions;
  84     struct http_session *next;
  85 };
  86
  87 struct http_sessions {
  88     struct http_session *session_list;
  89     YAZ_MUTEX mutex;
  90     int log_level;
  91 };
  92
  93 static YAZ_MUTEX g_http_session_mutex = 0;
  94 static int g_http_sessions = 0;
  95
  96 int get_version(struct http_request *rq) {
  97     const char *version = http_argbyname(rq, "version");
  98     int version_no = 0;
  99     if (version && strcmp(version, "")) {
 100         version_no = atoi(version);
 101     }
 102     return version_no;
 103 }
 104
 105
 106 int http_session_use(int delta)
 107 {
 108     int sessions;
 109     if (!g_http_session_mutex)
 110         yaz_mutex_create(&g_http_session_mutex);
 111     yaz_mutex_enter(g_http_session_mutex);
 112     g_http_sessions += delta;
 113     sessions = g_http_sessions;
 114     yaz_mutex_leave(g_http_session_mutex);
 115     yaz_log(YLOG_DEBUG, "%s sessions=%d", delta == 0 ? "" : (delta > 0 ? "INC" : "DEC"), sessions);
 116     return sessions;
 117
 118 }
 119
 120 http_sessions_t http_sessions_create(void)
 121 {
 122     http_sessions_t hs = xmalloc(sizeof(*hs));
 123     hs->session_list = 0;
 124     hs->mutex = 0;
 125     pazpar2_mutex_create(&hs->mutex, "http_sessions");
 126     hs->log_level = yaz_log_module_level("HTTP");
 127     return hs;
 128 }
 129
 130 void http_sessions_destroy(http_sessions_t hs)
 131 {
 132     if (hs)
 133     {
 134         struct http_session *s = hs->session_list;
 135         while (s)
 136         {
 137             struct http_session *s_next = s->next;
 138             iochan_destroy(s->timeout_iochan);
 139             session_destroy(s->psession);
 140             nmem_destroy(s->nmem);
 141             s = s_next;
 142         }
 143         yaz_mutex_destroy(&hs->mutex);
 144         xfree(hs);
 145     }
 146 }
 147
 148 void http_session_destroy(struct http_session *s);
 149
 150 static void session_timeout(IOCHAN i, int event)
 151 {
 152     struct http_session *s = iochan_getdata(i);
 153     http_session_destroy(s);
 154 }
 155
 156 struct http_session *http_session_create(struct conf_service *service,
 157                                          http_sessions_t http_sessions,
 158                                          unsigned int sesid)
 159 {
 160     NMEM nmem = nmem_create();
 161     struct http_session *r = nmem_malloc(nmem, sizeof(*r));
 162     char tmp_str[50];
 163
 164     sprintf(tmp_str, "session#%u", sesid);
 165     r->psession = new_session(nmem, service, sesid);
 166     r->session_id = sesid;
 167     r->timestamp = 0;
 168     r->nmem = nmem;
 169     r->destroy_counter = r->activity_counter = 0;
 170     r->http_sessions = http_sessions;
 171
 172     yaz_mutex_enter(http_sessions->mutex);
 173     r->next = http_sessions->session_list;
 174     http_sessions->session_list = r;
 175     yaz_mutex_leave(http_sessions->mutex);
 176
 177     r->timeout_iochan = iochan_create(-1, session_timeout, 0, "http_session_timeout");
 178     iochan_setdata(r->timeout_iochan, r);
 179     yaz_log(http_sessions->log_level, "Session %u created. timeout chan=%p timeout=%d", sesid, r->timeout_iochan, service->session_timeout);
 180     iochan_settimeout(r->timeout_iochan, service->session_timeout);
 181
 182     iochan_add(service->server->iochan_man, r->timeout_iochan);
 183     http_session_use(1);
 184     return r;
 185 }
 186
 187 void http_session_destroy(struct http_session *s)
 188 {
 189     int must_destroy = 0;
 190
 191     http_sessions_t http_sessions = s->http_sessions;
 192
 193     yaz_log(http_sessions->log_level, "Session %u destroy", s->session_id);
 194     yaz_mutex_enter(http_sessions->mutex);
 195     /* only if http_session has no active http sessions on it can be destroyed */
 196     if (s->destroy_counter == s->activity_counter)
 197     {
 198         struct http_session **p = 0;
 199         must_destroy = 1;
 200         for (p = &http_sessions->session_list; *p; p = &(*p)->next)
 201             if (*p == s)
 202             {
 203                 *p = (*p)->next;
 204                 break;
 205             }
 206     }
 207     yaz_mutex_leave(http_sessions->mutex);
 208     if (must_destroy)
 209     {   /* destroying for real */
 210         yaz_log(http_sessions->log_level, "Session %u destroyed", s->session_id);
 211         iochan_destroy(s->timeout_iochan);
 212         session_destroy(s->psession);
 213         http_session_use(-1);
 214         nmem_destroy(s->nmem);
 215     }
 216     else {
 217         yaz_log(http_sessions->log_level, "Session %u destroying delayed. Active clients (%d-%d). Waiting for new timeout.",
 218                 s->session_id, s->activity_counter, s->destroy_counter);
 219     }
 220
 221 }
 222
 223 static const char *get_msg(enum pazpar2_error_code code)
 224 {
 225     struct pazpar2_error_msg {
 226         enum pazpar2_error_code code;
 227         const char *msg;
 228     };
 229     static const struct pazpar2_error_msg ar[] = {
 230         { PAZPAR2_NO_SESSION, "Session does not exist or it has expired"},
 231         { PAZPAR2_MISSING_PARAMETER, "Missing parameter"},
 232         { PAZPAR2_MALFORMED_PARAMETER_VALUE, "Malformed parameter value"},
 233         { PAZPAR2_MALFORMED_PARAMETER_ENCODING, "Malformed parameter encoding"},
 234         { PAZPAR2_MALFORMED_SETTING, "Malformed setting argument"},
 235         { PAZPAR2_HITCOUNTS_FAILED, "Failed to retrieve hitcounts"},
 236         { PAZPAR2_RECORD_MISSING, "Record missing"},
 237         { PAZPAR2_NO_TARGETS, "No targets"},
 238         { PAZPAR2_CONFIG_TARGET, "Target cannot be configured"},
 239         { PAZPAR2_RECORD_FAIL, "Record command failed"},
 240         { PAZPAR2_NOT_IMPLEMENTED, "Not implemented"},
 241         { PAZPAR2_NO_SERVICE, "No service"},
 242         { PAZPAR2_ALREADY_BLOCKED, "Already blocked in session on: "},
 243         { PAZPAR2_LAST_ERROR, "Last error"},
 244         { 0, 0 }
 245     };
 246     int i = 0;
 247     while (ar[i].msg)
 248     {
 249         if (code == ar[i].code)
 250             return ar[i].msg;
 251         i++;
 252     }
 253     return "No error";
 254 }
 255
 256 static void error(struct http_response *rs,
 257                   enum pazpar2_error_code code,
 258                   const char *addinfo)
 259 {
 260     struct http_channel *c = rs->channel;
 261     WRBUF text = wrbuf_alloc();
 262     const char *http_status = "417";
 263     const char *msg = get_msg(code);
 264
 265     rs->msg = nmem_strdup(c->nmem, msg);
 266     strcpy(rs->code, http_status);
 267
 268     wrbuf_printf(text, HTTP_COMMAND_RESPONSE_PREFIX "<error code=\"%d\" msg=\"%s\">", (int) code,
 269                msg);
 270     if (addinfo)
 271         wrbuf_xmlputs(text, addinfo);
 272     wrbuf_puts(text, "</error>");
 273
 274     yaz_log(YLOG_WARN, "HTTP %s %s%s%s", http_status,
 275             msg, addinfo ? ": " : "" , addinfo ? addinfo : "");
 276     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(text));
 277     wrbuf_destroy(text);
 278     http_send_response(c);
 279 }
 280
 281 static void response_open_no_status(struct http_channel *c, const char *command)
 282 {
 283     wrbuf_rewind(c->wrbuf);
 284     wrbuf_printf(c->wrbuf, "%s<%s>",
 285                  HTTP_COMMAND_RESPONSE_PREFIX, command);
 286 }
 287
 288 static void response_open(struct http_channel *c, const char *command)
 289 {
 290     response_open_no_status(c, command);
 291     wrbuf_puts(c->wrbuf, "<status>OK</status>");
 292 }
 293
 294 static void response_close(struct http_channel *c, const char *command)
 295 {
 296     struct http_response *rs = c->response;
 297
 298     wrbuf_printf(c->wrbuf, "</%s>", command);
 299     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 300     http_send_response(c);
 301 }
 302
 303 unsigned int make_sessionid(void)
 304 {
 305     static int seq = 0; /* thread pr */
 306     unsigned int res;
 307
 308     seq++;
 309     if (global_parameters.predictable_sessions)
 310         res = seq;
 311     else
 312     {
 313 #ifdef WIN32
 314         res = seq;
 315 #else
 316         struct timeval t;
 317
 318         if (gettimeofday(&t, 0) < 0)
 319         {
 320             yaz_log(YLOG_WARN|YLOG_ERRNO, "gettimeofday");
 321             exit(1);
 322         }
 323         /* at most 256 sessions per second ..
 324            (long long would be more appropriate)*/
 325         res = t.tv_sec;
 326         res = ((res << 8) | (seq & 0xff)) & ((1U << 31) - 1);
 327 #endif
 328     }
 329     return res;
 330 }
 331
 332 static struct http_session *locate_session(struct http_channel *c)
 333 {
 334     struct http_request *rq = c->request;
 335     struct http_response *rs = c->response;
 336     struct http_session *p;
 337     const char *session = http_argbyname(rq, "session");
 338     http_sessions_t http_sessions = c->http_sessions;
 339     unsigned int id;
 340
 341     if (!session)
 342     {
 343         error(rs, PAZPAR2_MISSING_PARAMETER, "session");
 344         return 0;
 345     }
 346     id = atoi(session);
 347     yaz_mutex_enter(http_sessions->mutex);
 348     for (p = http_sessions->session_list; p; p = p->next)
 349         if (id == p->session_id)
 350             break;
 351     if (p)
 352         p->activity_counter++;
 353     yaz_mutex_leave(http_sessions->mutex);
 354     if (p)
 355         iochan_activity(p->timeout_iochan);
 356     else
 357         error(rs, PAZPAR2_NO_SESSION, session);
 358     return p;
 359 }
 360
 361 // Call after use of locate_session, in order to increment the destroy_counter
 362 static void release_session(struct http_channel *c,
 363                             struct http_session *session)
 364 {
 365     http_sessions_t http_sessions = c->http_sessions;
 366     yaz_mutex_enter(http_sessions->mutex);
 367     if (session)
 368         session->destroy_counter++;
 369     yaz_mutex_leave(http_sessions->mutex);
 370 }
 371
 372 // Decode settings parameters and apply to session
 373 // Syntax: setting[target]=value
 374 static int process_settings(struct session *se, struct http_request *rq,
 375                             struct http_response *rs)
 376 {
 377     struct http_argument *a;
 378
 379     for (a = rq->arguments; a; a = a->next)
 380         if (strchr(a->name, '['))
 381         {
 382             char **res;
 383             int num;
 384             char *dbname;
 385             char *setting;
 386
 387             // Nmem_strsplit *rules*!!!
 388             nmem_strsplit(se->session_nmem, "[]", a->name, &res, &num);
 389             if (num != 2)
 390             {
 391                 error(rs, PAZPAR2_MALFORMED_SETTING, a->name);
 392                 return -1;
 393             }
 394             setting = res[0];
 395             dbname = res[1];
 396             session_apply_setting(se, dbname, setting,
 397                     nmem_strdup(se->session_nmem, a->value));
 398         }
 399     return 0;
 400 }
 401
 402 static void cmd_exit(struct http_channel *c)
 403 {
 404     yaz_log(YLOG_WARN, "exit");
 405
 406     response_open(c, "exit");
 407     response_close(c, "exit");
 408     http_close_server(c->server);
 409 }
 410
 411 static void cmd_init(struct http_channel *c)
 412 {
 413     struct http_request *r = c->request;
 414     const char *clear = http_argbyname(r, "clear");
 415     const char *content_type = http_lookup_header(r->headers, "Content-Type");
 416     unsigned int sesid;
 417     struct http_session *s;
 418     struct http_response *rs = c->response;
 419     struct conf_service *service = 0; /* no service (yet) */
 420
 421     if (r->content_len && content_type &&
 422         !yaz_strcmp_del("text/xml", content_type, "; "))
 423     {
 424         xmlDoc *doc = xmlParseMemory(r->content_buf, r->content_len);
 425         xmlNode *root_n;
 426         if (!doc)
 427         {
 428             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 429             return;
 430         }
 431         root_n = xmlDocGetRootElement(doc);
 432         service = service_create(c->server, root_n);
 433         xmlFreeDoc(doc);
 434         if (!service)
 435         {
 436             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 437             return;
 438         }
 439     }
 440
 441     if (!service)
 442     {
 443         const char *service_name = http_argbyname(c->request, "service");
 444         service = locate_service(c->server, service_name);
 445         if (!service)
 446         {
 447             error(rs, PAZPAR2_NO_SERVICE, service_name ? service_name : "unnamed");
 448             return;
 449         }
 450     }
 451     sesid = make_sessionid();
 452     s = http_session_create(service, c->http_sessions, sesid);
 453
 454     yaz_log(c->http_sessions->log_level, "Session init %u ", sesid);
 455     if (!clear || *clear == '0')
 456         session_init_databases(s->psession);
 457     else
 458         yaz_log(YLOG_LOG, "Session %u init: No databases preloaded", sesid);
 459
 460     if (process_settings(s->psession, c->request, c->response) < 0)
 461         return;
 462
 463     response_open(c, "init");
 464     wrbuf_printf(c->wrbuf, "<session>%d", sesid);
 465     if (c->server->server_id)
 466     {
 467         wrbuf_puts(c->wrbuf, ".");
 468         wrbuf_puts(c->wrbuf, c->server->server_id);
 469     }
 470     wrbuf_puts(c->wrbuf, "</session>"
 471                "<protocol>" PAZPAR2_PROTOCOL_VERSION "</protocol>");
 472
 473     wrbuf_printf(c->wrbuf, "<keepAlive>%d</keepAlive>\n", 1000 * ((s->psession->service->session_timeout >= 20) ?
 474                                                                   (s->psession->service->session_timeout - 10) : 50));
 475     response_close(c, "init");
 476 }
 477
 478 static void apply_local_setting(void *client_data,
 479                                 struct setting *set)
 480 {
 481     struct session *se =  (struct session *) client_data;
 482
 483     session_apply_setting(se, nmem_strdup(se->session_nmem, set->target),
 484                           nmem_strdup(se->session_nmem, set->name),
 485                           nmem_strdup(se->session_nmem, set->value));
 486 }
 487
 488 static void cmd_settings(struct http_channel *c)
 489 {
 490     struct http_response *rs = c->response;
 491     struct http_request *rq = c->request;
 492     struct http_session *s = locate_session(c);
 493     const char *content_type = http_lookup_header(rq->headers, "Content-Type");
 494
 495     if (!s)
 496         return;
 497
 498     if (rq->content_len && content_type &&
 499         !yaz_strcmp_del("text/xml", content_type, "; "))
 500     {
 501         xmlDoc *doc = xmlParseMemory(rq->content_buf, rq->content_len);
 502         xmlNode *root_n;
 503         int ret;
 504         if (!doc)
 505         {
 506             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 507             release_session(c,s);
 508             return;
 509         }
 510         root_n = xmlDocGetRootElement(doc);
 511         ret = settings_read_node_x(root_n, s->psession, apply_local_setting);
 512         xmlFreeDoc(doc);
 513         if (ret)
 514         {
 515             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 516             release_session(c,s);
 517             return;
 518         }
 519     }
 520     if (process_settings(s->psession, rq, rs) < 0)
 521     {
 522         release_session(c, s);
 523         return;
 524     }
 525     response_open(c, "settings");
 526     response_close(c, "settings");
 527     release_session(c, s);
 528 }
 529
 530 static void termlist_response(struct http_channel *c, struct http_session *s, const char *cmd_status)
 531 {
 532     struct http_request *rq = c->request;
 533     const char *name    = http_argbyname(rq, "name");
 534     const char *nums    = http_argbyname(rq, "num");
 535     int version = get_version(rq);
 536     int num = 15;
 537     int status;
 538
 539     if (nums)
 540         num = atoi(nums);
 541
 542     status = session_active_clients(s->psession);
 543
 544     response_open_no_status(c, "termlist");
 545     /* new protocol add a status to response. Triggered by a status parameter */
 546     if (cmd_status != 0) {
 547         wrbuf_printf(c->wrbuf, "<status>%s</status>\n", cmd_status);
 548     }
 549     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", status);
 550
 551     perform_termlist(c, s->psession, name, num, version);
 552
 553     response_close(c, "termlist");
 554 }
 555
 556 static void termlist_result_ready(void *data)
 557 {
 558     struct http_channel *c = (struct http_channel *) data;
 559     struct http_request *rq = c->request;
 560     const char *report = http_argbyname(rq, "report");
 561     const char *status = 0;
 562     struct http_session *s = locate_session(c);
 563     if (report && !strcmp("status", report))
 564         status = "OK";
 565     if (s) {
 566         yaz_log(c->http_sessions->log_level, "Session %u termlist watch released", s->session_id);
 567         termlist_response(c, s, status);
 568         release_session(c,s);
 569     }
 570 }
 571
 572 static void cmd_termlist(struct http_channel *c)
 573 {
 574     struct http_request *rq = c->request;
 575     struct http_response *rs = c->response;
 576     struct http_session *s = locate_session(c);
 577     const char *block = http_argbyname(rq, "block");
 578     const char *report = http_argbyname(rq, "report");
 579     int report_status = 0;
 580     int report_error = 0;
 581     const char *status_message = 0;
 582     int active_clients;
 583     if (report  && !strcmp("error", report)) {
 584         report_error = 1;
 585         status_message = "OK";
 586     }
 587     if (report  && !strcmp("status", report)) {
 588         report_status = 1;
 589         status_message = "OK";
 590     }
 591     if (!s)
 592         return;
 593
 594     active_clients = session_active_clients(s->psession);
 595     if (block && !strcmp("1", block) && active_clients)
 596     {
 597         // if there is already a watch/block. we do not block this one
 598         if (session_set_watch(s->psession, SESSION_WATCH_TERMLIST,
 599                               termlist_result_ready, c, c) != 0)
 600         {
 601             yaz_log(YLOG_WARN, "Session %u: Attempt to block multiple times on termlist block. Not supported!", s->session_id);
 602             if (report_error) {
 603                 error(rs, PAZPAR2_ALREADY_BLOCKED, "termlist");
 604                 release_session(c, s);
 605                 return;
 606             }
 607             else if (report_status) {
 608                 status_message = "WARNING (Already blocked on termlist)";
 609             }
 610             else {
 611                 yaz_log(YLOG_WARN, "Session %u: Ignoring termlist block. Return current result", s->session_id);
 612             }
 613         }
 614         else
 615         {
 616             yaz_log(c->http_sessions->log_level, "Session %u: Blocking on command termlist", s->session_id);
 617             release_session(c, s);
 618             return;
 619         }
 620     }
 621
 622     termlist_response(c, s, status_message);
 623     release_session(c, s);
 624 }
 625
 626 size_t session_get_memory_status(struct session *session);
 627
 628 static void session_status(struct http_channel *c, struct http_session *s)
 629 {
 630     size_t session_nmem;
 631     wrbuf_printf(c->wrbuf, "<http_count>%u</http_count>\n", s->activity_counter);
 632     wrbuf_printf(c->wrbuf, "<http_nmem>%zu</http_nmem>\n", nmem_total(s->nmem) );
 633     session_nmem = session_get_memory_status(s->psession);
 634     wrbuf_printf(c->wrbuf, "<session_nmem>%zu</session_nmem>\n", session_nmem);
 635 }
 636
 637 static void cmd_session_status(struct http_channel *c)
 638 {
 639     struct http_session *s = locate_session(c);
 640     if (!s)
 641         return;
 642
 643     response_open(c, "session-status");
 644     session_status(c, s);
 645     response_close(c, "session-status");
 646     release_session(c, s);
 647 }
 648
 649 int sessions_count(void);
 650 int clients_count(void);
 651 #ifdef HAVE_RESULTSETS_COUNT
 652 int resultsets_count(void);
 653 #else
 654 #define resultsets_count()      0
 655 #endif
 656
 657 static void cmd_server_status(struct http_channel *c)
 658 {
 659     int sessions   = sessions_count();
 660     int clients    = clients_count();
 661     int resultsets = resultsets_count();
 662
 663     response_open(c, "server-status");
 664     wrbuf_printf(c->wrbuf, "\n  <sessions>%u</sessions>\n", sessions);
 665     wrbuf_printf(c->wrbuf, "  <clients>%u</clients>\n",   clients);
 666     /* Only works if yaz has been compiled with enabling of this */
 667     wrbuf_printf(c->wrbuf, "  <resultsets>%u</resultsets>\n",resultsets);
 668     print_meminfo(c->wrbuf);
 669
 670 /* TODO add all sessions status                         */
 671 /*    http_sessions_t http_sessions = c->http_sessions; */
 672 /*    struct http_session *p;                           */
 673 /*
 674     yaz_mutex_enter(http_sessions->mutex);
 675     for (p = http_sessions->session_list; p; p = p->next)
 676     {
 677         p->activity_counter++;
 678         wrbuf_puts(c->wrbuf, "<session-status>\n");
 679         wrbuf_printf(c->wrbuf, "<id>%s</id>\n", p->session_id);
 680         yaz_mutex_leave(http_sessions->mutex);
 681         session_status(c, p);
 682         wrbuf_puts(c->wrbuf, "</session-status>\n");
 683         yaz_mutex_enter(http_sessions->mutex);
 684         p->activity_counter--;
 685     }
 686     yaz_mutex_leave(http_sessions->mutex);
 687 */
 688     response_close(c, "server-status");
 689     xmalloc_trav(0);
 690 }
 691
 692 static void bytarget_response(struct http_channel *c, struct http_session *s, const char *cmd_status) {
 693     int count, i;
 694     struct hitsbytarget *ht;
 695     struct http_request *rq = c->request;
 696     const char *settings = http_argbyname(rq, "settings");
 697     int version = get_version(rq);
 698     ht = get_hitsbytarget(s->psession, &count, c->nmem);
 699     if (!cmd_status)
 700         /* Old protocol, always ok */
 701         response_open(c, "bytarget");
 702     else {
 703         /* New protocol, OK or WARNING (...)*/
 704         response_open_no_status(c, "bytarget");
 705         wrbuf_printf(c->wrbuf, "<status>%s</status>", cmd_status);
 706     }
 707
 708     if (count == 0)
 709         yaz_log(YLOG_WARN, "Empty bytarget Response. No targets found!");
 710     for (i = 0; i < count; i++)
 711     {
 712         wrbuf_puts(c->wrbuf, "\n<target>");
 713
 714         wrbuf_puts(c->wrbuf, "<id>");
 715         wrbuf_xmlputs(c->wrbuf, ht[i].id);
 716         wrbuf_puts(c->wrbuf, "</id>\n");
 717
 718         if (ht[i].name && ht[i].name[0])
 719         {
 720             wrbuf_puts(c->wrbuf, "<name>");
 721             wrbuf_xmlputs(c->wrbuf, ht[i].name);
 722             wrbuf_puts(c->wrbuf, "</name>\n");
 723         }
 724
 725         wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", ht[i].hits);
 726         wrbuf_printf(c->wrbuf, "<diagnostic>%d</diagnostic>\n", ht[i].diagnostic);
 727         if (ht[i].diagnostic)
 728         {
 729             wrbuf_puts(c->wrbuf, "<addinfo>");
 730             if (ht[i].addinfo)
 731                 wrbuf_xmlputs(c->wrbuf, ht[i].addinfo);
 732             wrbuf_puts(c->wrbuf, "</addinfo>\n");
 733         }
 734
 735         wrbuf_printf(c->wrbuf, "<records>%d</records>\n", ht[i].records - ht[i].filtered);
 736         if (version >= 2) {
 737             wrbuf_printf(c->wrbuf, "<filtered>%d</filtered>\n", ht[i].filtered);
 738             wrbuf_printf(c->wrbuf, "<approximation>" ODR_INT_PRINTF "</approximation>\n", ht[i].approximation);
 739         }
 740         wrbuf_puts(c->wrbuf, "<state>");
 741         wrbuf_xmlputs(c->wrbuf, ht[i].state);
 742         wrbuf_puts(c->wrbuf, "</state>\n");
 743         if (settings && *settings == '1')
 744         {
 745             wrbuf_puts(c->wrbuf, "<settings>\n");
 746             wrbuf_puts(c->wrbuf, ht[i].settings_xml);
 747             wrbuf_puts(c->wrbuf, "</settings>\n");
 748         }
 749         if (ht[i].suggestions_xml && ht[i].suggestions_xml[0]) {
 750             wrbuf_puts(c->wrbuf, "<suggestions>");
 751             wrbuf_puts(c->wrbuf, ht[i].suggestions_xml);
 752             wrbuf_puts(c->wrbuf, "</suggestions>");
 753         }
 754         wrbuf_puts(c->wrbuf, "</target>");
 755     }
 756     response_close(c, "bytarget");
 757 }
 758
 759 static void bytarget_result_ready(void *data)
 760 {
 761     struct http_channel *c = (struct http_channel *) data;
 762     struct http_session *s = locate_session(c);
 763     const char *status_message = "OK";
 764     if (s) {
 765         yaz_log(c->http_sessions->log_level, "Session %u: bytarget watch released", s->session_id);
 766         bytarget_response(c, s, status_message);
 767         release_session(c, s);
 768     }
 769     else {
 770         yaz_log(c->http_sessions->log_level, "No Session found for released bytarget watch");
 771     }
 772 }
 773
 774
 775 static void cmd_bytarget(struct http_channel *c)
 776 {
 777     struct http_request *rq = c->request;
 778     struct http_response *rs = c->response;
 779     struct http_session *s = locate_session(c);
 780     const char *block = http_argbyname(rq, "block");
 781     const char *report = http_argbyname(rq, "report");
 782     int report_error = 0;
 783     int report_status = 0;
 784     const char *status_message = "OK";
 785     int no_active;
 786
 787     if (report && !strcmp("error", report)) {
 788         report_error = 1;
 789     }
 790     if (report && !strcmp("status", report)) {
 791         report_status = 1;
 792     }
 793
 794     if (!s)
 795         return;
 796
 797     no_active = session_active_clients(s->psession);
 798     if (block && !strcmp("1",block) && no_active)
 799     {
 800         // if there is already a watch/block. we do not block this one
 801         if (session_set_watch(s->psession, SESSION_WATCH_BYTARGET,
 802                               bytarget_result_ready, c, c) != 0)
 803         {
 804             yaz_log(YLOG_WARN, "Session %u: Attempt to block multiple times on bytarget block. Not supported!", s->session_id);
 805             if (report_error) {
 806                 error(rs, PAZPAR2_ALREADY_BLOCKED, "bytarget");
 807                 release_session(c, s);
 808                 return;
 809             }
 810             else if (report_status) {
 811                 status_message = "WARNING (Already blocked on bytarget)";
 812             }
 813             else {
 814                 yaz_log(YLOG_WARN, "Session %u: Ignoring bytarget block. Return current result.", s->session_id);
 815             }
 816         }
 817         else
 818         {
 819             yaz_log(c->http_sessions->log_level, "Session %u: Blocking on command bytarget", s->session_id);
 820             release_session(c, s);
 821             return;
 822         }
 823     }
 824     bytarget_response(c, s, status_message);
 825     release_session(c, s);
 826 }
 827
 828 static void write_metadata(WRBUF w, struct conf_service *service,
 829                            struct record_metadata **ml, int full, int indent)
 830 {
 831     int imeta;
 832
 833     for (imeta = 0; imeta < service->num_metadata; imeta++)
 834     {
 835         struct conf_metadata *cmd = &service->metadata[imeta];
 836         struct record_metadata *md;
 837         if (!cmd->brief && !full)
 838             continue;
 839         for (md = ml[imeta]; md; md = md->next)
 840         {
 841             struct record_metadata_attr *attr = md->attributes;
 842             int i;
 843             for (i = 0; i < indent; i++)
 844                 wrbuf_putc(w, ' ');
 845             wrbuf_printf(w, "<md-%s", cmd->name);
 846
 847             for (; attr; attr = attr->next)
 848             {
 849                 wrbuf_printf(w, " %s=\"", attr->name);
 850                 wrbuf_xmlputs(w, attr->value);
 851                 wrbuf_puts(w, "\"");
 852             }
 853             wrbuf_puts(w, ">");
 854             switch (cmd->type)
 855             {
 856                 case Metadata_type_generic:
 857                     wrbuf_xmlputs(w, md->data.text.disp);
 858                     break;
 859                 case Metadata_type_year:
 860                     wrbuf_printf(w, "%d", md->data.number.min);
 861                     if (md->data.number.min != md->data.number.max)
 862                         wrbuf_printf(w, "-%d", md->data.number.max);
 863                     break;
 864                 default:
 865                     wrbuf_puts(w, "[can't represent]");
 866                     break;
 867             }
 868             wrbuf_printf(w, "</md-%s>\n", cmd->name);
 869         }
 870     }
 871 }
 872
 873 static void write_subrecord(struct record *r, WRBUF w,
 874         struct conf_service *service, int show_details)
 875 {
 876     const char *name = session_setting_oneval(
 877         client_get_database(r->client), PZ_NAME);
 878
 879     wrbuf_puts(w, " <location id=\"");
 880     wrbuf_xmlputs(w, client_get_id(r->client));
 881     wrbuf_puts(w, "\"\n");
 882
 883     wrbuf_puts(w, "    name=\"");
 884     wrbuf_xmlputs(w,  *name ? name : "Unknown");
 885     wrbuf_puts(w, "\" ");
 886
 887     wrbuf_puts(w, "checksum=\"");
 888     wrbuf_printf(w,  "%u", r->checksum);
 889     wrbuf_puts(w, "\">\n");
 890
 891     write_metadata(w, service, r->metadata, show_details, 2);
 892     wrbuf_puts(w, " </location>\n");
 893 }
 894
 895 static void show_raw_record_error(void *data, const char *addinfo)
 896 {
 897     http_channel_observer_t obs = data;
 898     struct http_channel *c = http_channel_observer_chan(obs);
 899     struct http_response *rs = c->response;
 900
 901     http_remove_observer(obs);
 902
 903     error(rs, PAZPAR2_RECORD_FAIL, addinfo);
 904 }
 905
 906 static void show_raw_record_ok(void *data, const char *buf, size_t sz)
 907 {
 908     http_channel_observer_t obs = data;
 909     struct http_channel *c = http_channel_observer_chan(obs);
 910     struct http_response *rs = c->response;
 911
 912     http_remove_observer(obs);
 913
 914     wrbuf_write(c->wrbuf, buf, sz);
 915     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 916     http_send_response(c);
 917 }
 918
 919
 920 static void show_raw_record_ok_binary(void *data, const char *buf, size_t sz)
 921 {
 922     http_channel_observer_t obs = data;
 923     struct http_channel *c = http_channel_observer_chan(obs);
 924     struct http_response *rs = c->response;
 925
 926     http_remove_observer(obs);
 927
 928     wrbuf_write(c->wrbuf, buf, sz);
 929     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 930
 931     rs->content_type = "application/octet-stream";
 932     http_send_response(c);
 933 }
 934
 935
 936 void show_raw_reset(void *data, struct http_channel *c, void *data2)
 937 {
 938     //struct client *client = data;
 939     //client_show_raw_remove(client, data2);
 940 }
 941
 942 static void cmd_record_ready(void *data);
 943
 944 static void show_record(struct http_channel *c, struct http_session *s)
 945 {
 946     struct http_response *rs = c->response;
 947     struct http_request *rq = c->request;
 948     struct record_cluster *rec, *prev_r, *next_r;
 949     struct conf_service *service;
 950     const char *idstr = http_argbyname(rq, "id");
 951     const char *offsetstr = http_argbyname(rq, "offset");
 952     const char *binarystr = http_argbyname(rq, "binary");
 953     const char *checksumstr = http_argbyname(rq, "checksum");
 954
 955     if (!s)
 956         return;
 957     service = s->psession->service;
 958     if (!idstr)
 959     {
 960         error(rs, PAZPAR2_MISSING_PARAMETER, "id");
 961         return;
 962     }
 963     wrbuf_rewind(c->wrbuf);
 964     if (!(rec = show_single_start(s->psession, idstr, &prev_r, &next_r)))
 965     {
 966         if (session_active_clients(s->psession) == 0)
 967         {
 968             error(rs, PAZPAR2_RECORD_MISSING, idstr);
 969         }
 970         else if (session_set_watch(s->psession, SESSION_WATCH_RECORD,
 971                               cmd_record_ready, c, c) != 0)
 972         {
 973             error(rs, PAZPAR2_RECORD_MISSING, idstr);
 974         }
 975         return;
 976     }
 977     if (offsetstr || checksumstr)
 978     {
 979         const char *syntax = http_argbyname(rq, "syntax");
 980         const char *esn = http_argbyname(rq, "esn");
 981         int i;
 982         struct record*r = rec->records;
 983         int binary = 0;
 984         const char *nativesyntax = http_argbyname(rq, "nativesyntax");
 985
 986         if (binarystr && *binarystr != '0')
 987             binary = 1;
 988
 989         if (checksumstr)
 990         {
 991             long v = atol(checksumstr);
 992             for (i = 0; r; r = r->next)
 993                 if (v == r->checksum)
 994                     break;
 995             if (!r)
 996                 error(rs, PAZPAR2_RECORD_FAIL, "no record");
 997         }
 998         else
 999         {
1000             int offset = atoi(offsetstr);
1001             for (i = 0; i < offset && r; r = r->next, i++)
1002                 ;
1003             if (!r)
1004                 error(rs, PAZPAR2_RECORD_FAIL, "no record at offset given");
1005         }
1006         if (r)
1007         {
1008             http_channel_observer_t obs =
1009                 http_add_observer(c, r->client, show_raw_reset);
1010             int ret = client_show_raw_begin(r->client, r->position,
1011                                             syntax, esn,
1012                                             obs /* data */,
1013                                             show_raw_record_error,
1014                                             (binary ?
1015                                              show_raw_record_ok_binary :
1016                                              show_raw_record_ok),
1017                                             (binary ? 1 : 0),
1018                                             nativesyntax);
1019             if (ret == -1)
1020             {
1021                 http_remove_observer(obs);
1022                 error(rs, PAZPAR2_NO_SESSION, 0);
1023             }
1024         }
1025     }
1026     else
1027     {
1028         struct record *r;
1029         response_open_no_status(c, "record");
1030         wrbuf_puts(c->wrbuf, "\n <recid>");
1031         wrbuf_xmlputs(c->wrbuf, rec->recid);
1032         wrbuf_puts(c->wrbuf, "</recid>\n");
1033         if (prev_r)
1034         {
1035             wrbuf_puts(c->wrbuf, " <prevrecid>");
1036             wrbuf_xmlputs(c->wrbuf, prev_r->recid);
1037             wrbuf_puts(c->wrbuf, "</prevrecid>\n");
1038         }
1039         if (next_r)
1040         {
1041             wrbuf_puts(c->wrbuf, " <nextrecid>");
1042             wrbuf_xmlputs(c->wrbuf, next_r->recid);
1043             wrbuf_puts(c->wrbuf, "</nextrecid>\n");
1044         }
1045         wrbuf_printf(c->wrbuf, " <activeclients>%d</activeclients>\n",
1046                      session_active_clients(s->psession));
1047         write_metadata(c->wrbuf, service, rec->metadata, 1, 1);
1048         for (r = rec->records; r; r = r->next)
1049             write_subrecord(r, c->wrbuf, service, 2);
1050         response_close(c, "record");
1051     }
1052     show_single_stop(s->psession, rec);
1053 }
1054
1055 static void cmd_record_ready(void *data)
1056 {
1057     struct http_channel *c = (struct http_channel *) data;
1058     struct http_session *s = locate_session(c);
1059     if (s) {
1060         yaz_log(c->http_sessions->log_level, "Session %u: record watch released", s->session_id);
1061         show_record(c, s);
1062         release_session(c,s);
1063     }
1064 }
1065
1066 static void cmd_record(struct http_channel *c)
1067 {
1068     struct http_session *s = locate_session(c);
1069     if (s) {
1070         show_record(c, s);
1071         release_session(c,s);
1072     }
1073 }
1074
1075
1076 static void show_records(struct http_channel *c, struct http_session *s, int active)
1077 {
1078     struct http_request *rq = c->request;
1079     struct http_response *rs = c->response;
1080     struct record_cluster **rl;
1081     struct reclist_sortparms *sp;
1082     const char *start = http_argbyname(rq, "start");
1083     const char *num = http_argbyname(rq, "num");
1084     const char *sort = http_argbyname(rq, "sort");
1085     int version = get_version(rq);
1086
1087     int startn = 0;
1088     int numn = 20;
1089     int total;
1090     Odr_int total_hits;
1091     Odr_int approx_hits;
1092     int i;
1093     struct conf_service *service = 0;
1094     if (!s)
1095         return;
1096
1097     // We haven't counted clients yet if we're called on a block release
1098     if (active < 0)
1099         active = session_active_clients(s->psession);
1100
1101     if (start)
1102         startn = atoi(start);
1103     if (num)
1104         numn = atoi(num);
1105
1106     service = s->psession->service;
1107     if (!sort) {
1108         sort = service->default_sort;
1109     }
1110     if (!(sp = reclist_parse_sortparms(c->nmem, sort, service)))
1111     {
1112         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1113         return;
1114
1115     }
1116
1117     rl = show_range_start(s->psession, sp, startn, &numn, &total, &total_hits, &approx_hits);
1118
1119     response_open(c, "show");
1120     wrbuf_printf(c->wrbuf, "\n<activeclients>%d</activeclients>\n", active);
1121     wrbuf_printf(c->wrbuf, "<merged>%d</merged>\n", total);
1122     wrbuf_printf(c->wrbuf, "<total>" ODR_INT_PRINTF "</total>\n", total_hits);
1123     if (version >= 2) {
1124         wrbuf_printf(c->wrbuf, "<approximation>" ODR_INT_PRINTF "</approximation>\n", approx_hits);
1125     }
1126     wrbuf_printf(c->wrbuf, "<start>%d</start>\n", startn);
1127     wrbuf_printf(c->wrbuf, "<num>%d</num>\n", numn);
1128
1129     for (i = 0; i < numn; i++)
1130     {
1131         int ccount;
1132         struct record *p;
1133         struct record_cluster *rec = rl[i];
1134         struct conf_service *service = s->psession->service;
1135
1136         wrbuf_puts(c->wrbuf, "<hit>\n");
1137         write_metadata(c->wrbuf, service, rec->metadata, 0, 1);
1138         for (ccount = 0, p = rl[i]->records; p;  p = p->next, ccount++)
1139             write_subrecord(p, c->wrbuf, service, 0); // subrecs w/o details
1140         wrbuf_printf(c->wrbuf, " <count>%d</count>\n", ccount);
1141         if (strstr(sort, "relevance"))
1142         {
1143             wrbuf_printf(c->wrbuf, " <relevance>%d</relevance>\n",
1144                          rec->relevance_score);
1145             wrbuf_printf(c->wrbuf, " <relevance_info>\n");
1146             wrbuf_xmlputs(c->wrbuf, wrbuf_cstr(rec->relevance_explain1));
1147             wrbuf_xmlputs(c->wrbuf, wrbuf_cstr(rec->relevance_explain2));
1148             wrbuf_printf(c->wrbuf, " </relevance_info>\n");
1149         }
1150         wrbuf_puts(c->wrbuf, " <recid>");
1151         wrbuf_xmlputs(c->wrbuf, rec->recid);
1152         wrbuf_puts(c->wrbuf, "</recid>\n");
1153         wrbuf_puts(c->wrbuf, "</hit>\n");
1154     }
1155
1156     show_range_stop(s->psession, rl);
1157
1158     response_close(c, "show");
1159 }
1160
1161 static void show_records_ready(void *data)
1162 {
1163     struct http_channel *c = (struct http_channel *) data;
1164     struct http_session *s = locate_session(c);
1165     if (s) {
1166         yaz_log(c->http_sessions->log_level, "Session %u: show watch released", s->session_id);
1167         show_records(c, s, -1);
1168     }
1169     else {
1170         /* some error message  */
1171     }
1172     release_session(c,s);
1173 }
1174
1175 static void cmd_show(struct http_channel *c)
1176 {
1177     struct http_request  *rq = c->request;
1178     struct http_response *rs = c->response;
1179     struct http_session *s = locate_session(c);
1180     const char *block = http_argbyname(rq, "block");
1181     const char *sort = http_argbyname(rq, "sort");
1182     const char *block_error = http_argbyname(rq, "report");
1183     struct conf_service *service = 0;
1184
1185     struct reclist_sortparms *sp;
1186     int status;
1187     int report_error = 0;
1188     if (block_error && !strcmp("1", block_error)) {
1189         report_error = 1;
1190     }
1191     if (!s)
1192         return;
1193
1194     service = s->psession->service;
1195     if (!sort) {
1196         sort = service->default_sort;
1197     }
1198
1199     if (!(sp = reclist_parse_sortparms(c->nmem, sort, service)))
1200     {
1201         error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1202         release_session(c, s);
1203         return;
1204     }
1205     session_sort(s->psession, sp->name, sp->increasing, sp->type == Metadata_sortkey_position);
1206
1207     status = session_active_clients(s->psession);
1208
1209     if (block)
1210     {
1211         if (!strcmp(block, "preferred") && !session_is_preferred_clients_ready(s->psession) && reclist_get_num_records(s->psession->reclist) == 0)
1212         {
1213             // if there is already a watch/block. we do not block this one
1214             if (session_set_watch(s->psession, SESSION_WATCH_SHOW_PREF,
1215                                   show_records_ready, c, c) == 0)
1216             {
1217                 yaz_log(c->http_sessions->log_level,
1218                         "Session %u: Blocking on command show (preferred targets)", s->session_id);
1219                 release_session(c, s);
1220                 return;
1221             }
1222             else
1223             {
1224                 yaz_log(YLOG_WARN, "Session %u: Attempt to block multiple times on show (preferred targets) block. Not supported!",
1225                     s->session_id);
1226                 if (report_error) {
1227                     error(rs, PAZPAR2_ALREADY_BLOCKED, "show (preferred targets)");
1228                     release_session(c, s);
1229                     return;
1230                 }
1231                 else {
1232                     yaz_log(YLOG_WARN, "Session %u: Ignoring show(preferred) block. Returning current result.", s->session_id);
1233                 }
1234             }
1235
1236         }
1237         else if (status)
1238         {
1239             // if there is already a watch/block. we do not block this one
1240             if (session_set_watch(s->psession, SESSION_WATCH_SHOW,
1241                                   show_records_ready, c, c) != 0)
1242             {
1243                 yaz_log(YLOG_WARN, "Session %u: Attempt to block multiple times on show block. Not supported!", s->session_id);
1244                 if (report_error) {
1245                     error(rs, PAZPAR2_ALREADY_BLOCKED, "show");
1246                     release_session(c, s);
1247                     return;
1248                 }
1249                 else {
1250                     yaz_log(YLOG_WARN, "Session %u: Ignoring show block. Returning current result.", s->session_id);
1251                 }
1252             }
1253             else
1254             {
1255                 yaz_log(c->http_sessions->log_level, "Session %u: Blocking on command show", s->session_id);
1256                 release_session(c, s);
1257                 return;
1258             }
1259         }
1260     }
1261     show_records(c, s, status);
1262     release_session(c, s);
1263 }
1264
1265 static void cmd_ping(struct http_channel *c)
1266 {
1267     struct http_session *s = locate_session(c);
1268     if (!s)
1269         return;
1270     response_open(c, "ping");
1271     response_close(c, "ping");
1272     release_session(c, s);
1273 }
1274
1275 static void cmd_search(struct http_channel *c)
1276 {
1277     struct http_request *rq = c->request;
1278     struct http_response *rs = c->response;
1279     struct http_session *s = locate_session(c);
1280     const char *query = http_argbyname(rq, "query");
1281     const char *filter = http_argbyname(rq, "filter");
1282     const char *maxrecs = http_argbyname(rq, "maxrecs");
1283     const char *startrecs = http_argbyname(rq, "startrecs");
1284     const char *limit = http_argbyname(rq, "limit");
1285     const char *sort = http_argbyname(rq, "sort");
1286     enum pazpar2_error_code code;
1287     const char *addinfo = 0;
1288     struct reclist_sortparms *sp;
1289     struct conf_service *service = 0;
1290
1291     if (!s)
1292         return;
1293
1294     if (!query)
1295     {
1296         error(rs, PAZPAR2_MISSING_PARAMETER, "query");
1297         release_session(c, s);
1298         return;
1299     }
1300     if (!yaz_utf8_check(query))
1301     {
1302         error(rs, PAZPAR2_MALFORMED_PARAMETER_ENCODING, "query");
1303         release_session(c, s);
1304         return;
1305     }
1306     service = s->psession->service;
1307     if (!sort) {
1308         sort = service->default_sort;
1309     }
1310     if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
1311     {
1312         error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1313         release_session(c, s);
1314         return;
1315     }
1316
1317     code = session_search(s->psession, query, startrecs, maxrecs, filter, limit,
1318                           &addinfo, sp);
1319     if (code)
1320     {
1321         error(rs, code, addinfo);
1322         release_session(c, s);
1323         return;
1324     }
1325     response_open(c, "search");
1326     response_close(c, "search");
1327     release_session(c, s);
1328 }
1329
1330
1331 static void cmd_stat(struct http_channel *c)
1332 {
1333     struct http_session *s = locate_session(c);
1334     struct statistics stat;
1335     int clients;
1336
1337     float progress = 0;
1338
1339     if (!s)
1340         return;
1341
1342     clients = session_active_clients(s->psession);
1343     statistics(s->psession, &stat);
1344
1345     if (stat.num_clients > 0)
1346     {
1347         progress = (stat.num_clients  - clients) / (float)stat.num_clients;
1348     }
1349
1350     response_open_no_status(c, "stat");
1351     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", clients);
1352     wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", stat.num_hits);
1353     wrbuf_printf(c->wrbuf, "<records>%d</records>\n", stat.num_records);
1354     wrbuf_printf(c->wrbuf, "<clients>%d</clients>\n", stat.num_clients);
1355     wrbuf_printf(c->wrbuf, "<unconnected>%d</unconnected>\n", stat.num_no_connection);
1356     wrbuf_printf(c->wrbuf, "<connecting>%d</connecting>\n", stat.num_connecting);
1357     wrbuf_printf(c->wrbuf, "<working>%d</working>\n", stat.num_working);
1358     wrbuf_printf(c->wrbuf, "<idle>%d</idle>\n", stat.num_idle);
1359     wrbuf_printf(c->wrbuf, "<failed>%d</failed>\n", stat.num_failed);
1360     wrbuf_printf(c->wrbuf, "<error>%d</error>\n", stat.num_error);
1361     wrbuf_printf(c->wrbuf, "<progress>%.2f</progress>\n", progress);
1362     response_close(c, "stat");
1363     release_session(c, s);
1364 }
1365
1366 static void cmd_info(struct http_channel *c)
1367 {
1368     char yaz_version_str[20];
1369
1370     response_open_no_status(c, "info");
1371     wrbuf_puts(c->wrbuf, " <version>\n");
1372     wrbuf_puts(c->wrbuf, "  <pazpar2");
1373 #ifdef PAZPAR2_VERSION_SHA1
1374     wrbuf_printf(c->wrbuf, " sha1=\"%s\"", PAZPAR2_VERSION_SHA1);
1375 #endif
1376     wrbuf_puts(c->wrbuf, ">");
1377     wrbuf_xmlputs(c->wrbuf, VERSION);
1378     wrbuf_puts(c->wrbuf, "</pazpar2>");
1379
1380     yaz_version(yaz_version_str, 0);
1381     wrbuf_puts(c->wrbuf, "  <yaz compiled=\"");
1382     wrbuf_xmlputs(c->wrbuf, YAZ_VERSION);
1383     wrbuf_puts(c->wrbuf, "\">");
1384     wrbuf_xmlputs(c->wrbuf, yaz_version_str);
1385     wrbuf_puts(c->wrbuf, "</yaz>\n");
1386
1387     wrbuf_puts(c->wrbuf, " </version>\n");
1388
1389     info_services(c->server, c->wrbuf);
1390
1391     response_close(c, "info");
1392 }
1393
1394 struct {
1395     char *name;
1396     void (*fun)(struct http_channel *c);
1397 } commands[] = {
1398     { "init", cmd_init },
1399     { "settings", cmd_settings },
1400     { "stat", cmd_stat },
1401     { "bytarget", cmd_bytarget },
1402     { "show", cmd_show },
1403     { "search", cmd_search },
1404     { "termlist", cmd_termlist },
1405     { "exit", cmd_exit },
1406     { "session-status", cmd_session_status },
1407     { "server-status", cmd_server_status },
1408     { "ping", cmd_ping },
1409     { "record", cmd_record },
1410     { "info", cmd_info },
1411     {0,0}
1412 };
1413
1414 void http_command(struct http_channel *c)
1415 {
1416     const char *command = http_argbyname(c->request, "command");
1417     struct http_response *rs = http_create_response(c);
1418     int i;
1419
1420     c->response = rs;
1421
1422     http_addheader(rs, "Expires", "Thu, 19 Nov 1981 08:52:00 GMT");
1423     http_addheader(rs, "Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
1424
1425     if (!command)
1426     {
1427         error(rs, PAZPAR2_MISSING_PARAMETER, "command");
1428         return;
1429     }
1430     for (i = 0; commands[i].name; i++)
1431         if (!strcmp(commands[i].name, command))
1432         {
1433             (*commands[i].fun)(c);
1434             break;
1435         }
1436     if (!commands[i].name)
1437         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "command");
1438
1439     return;
1440 }
1441
1442 /*
1443  * Local variables:
1444  * c-basic-offset: 4
1445  * c-file-style: "Stroustrup"
1446  * indent-tabs-mode: nil
1447  * End:
1448  * vim: shiftwidth=4 tabstop=8 expandtab
1449  */
1450