src/http_command.c

   1 /* This file is part of Pazpar2.
   2    Copyright (C) 2006-2011 Index Data
   3
   4 Pazpar2 is free software; you can redistribute it and/or modify it under
   5 the terms of the GNU General Public License as published by the Free
   6 Software Foundation; either version 2, or (at your option) any later
   7 version.
   8
   9 Pazpar2 is distributed in the hope that it will be useful, but WITHOUT ANY
  10 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17
  18 */
  19
  20 #if HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23 #include <stdio.h>
  24 #include <sys/types.h>
  25 #if HAVE_UNISTD_H
  26 #include <unistd.h>
  27 #endif
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #if HAVE_SYS_TIME_H
  31 #include <sys/time.h>
  32 #endif
  33 #include <yaz/snprintf.h>
  34 #include <yaz/yaz-util.h>
  35
  36 #include "ppmutex.h"
  37 #include "eventl.h"
  38 #include "parameters.h"
  39 #include "session.h"
  40 #include "http.h"
  41 #include "settings.h"
  42 #include "client.h"
  43
  44 #ifdef HAVE_MALLINFO
  45 #include <malloc.h>
  46
  47 void print_meminfo(WRBUF wrbuf)
  48 {
  49     struct mallinfo minfo;
  50     minfo = mallinfo();
  51     wrbuf_printf(wrbuf, "  <memory>\n"
  52                         "   <arena>%d</arena>\n"
  53                         "   <uordblks>%d</uordblks>\n"
  54                         "   <fordblks>%d</fordblks>\n"
  55                         "   <ordblks>%d</ordblks>\n"
  56                         "   <keepcost>%d</keepcost>\n"
  57                         "   <hblks>%d</hblks>\n"
  58                         "   <hblkhd>%d</hblkhd>\n"
  59                         "   <virt>%d</virt>\n"
  60                         "   <virtuse>%d</virtuse>\n"
  61                         "  </memory>\n",
  62                  minfo.arena, minfo.uordblks, minfo.fordblks,minfo.ordblks, minfo.keepcost, minfo.hblks, minfo.hblkhd, minfo.arena + minfo.hblkhd, minfo.uordblks + minfo.hblkhd);
  63
  64 }
  65 #else
  66 #define print_meminfo(x)
  67 #endif
  68
  69
  70 // Update this when the protocol changes
  71 #define PAZPAR2_PROTOCOL_VERSION "1"
  72
  73 #define HTTP_COMMAND_RESPONSE_PREFIX "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
  74
  75 struct http_session {
  76     IOCHAN timeout_iochan;     // NOTE: This is NOT associated with a socket
  77     struct session *psession;
  78     unsigned int session_id;
  79     int timestamp;
  80     int destroy_counter;
  81     int activity_counter;
  82     NMEM nmem;
  83     http_sessions_t http_sessions;
  84     struct http_session *next;
  85 };
  86
  87 struct http_sessions {
  88     struct http_session *session_list;
  89     YAZ_MUTEX mutex;
  90     int log_level;
  91 };
  92
  93 static YAZ_MUTEX g_http_session_mutex = 0;
  94 static int g_http_sessions = 0;
  95
  96 int http_session_use(int delta)
  97 {
  98     int sessions;
  99     if (!g_http_session_mutex)
 100         yaz_mutex_create(&g_http_session_mutex);
 101     yaz_mutex_enter(g_http_session_mutex);
 102     g_http_sessions += delta;
 103     sessions = g_http_sessions;
 104     yaz_mutex_leave(g_http_session_mutex);
 105     yaz_log(YLOG_DEBUG, "%s sessions=%d", delta == 0 ? "" : (delta > 0 ? "INC" : "DEC"), sessions);
 106     return sessions;
 107
 108 }
 109
 110 http_sessions_t http_sessions_create(void)
 111 {
 112     http_sessions_t hs = xmalloc(sizeof(*hs));
 113     hs->session_list = 0;
 114     hs->mutex = 0;
 115     pazpar2_mutex_create(&hs->mutex, "http_sessions");
 116     hs->log_level = yaz_log_module_level("HTTP");
 117     return hs;
 118 }
 119
 120 void http_sessions_destroy(http_sessions_t hs)
 121 {
 122     if (hs)
 123     {
 124         struct http_session *s = hs->session_list;
 125         while (s)
 126         {
 127             struct http_session *s_next = s->next;
 128             iochan_destroy(s->timeout_iochan);
 129             session_destroy(s->psession);
 130             nmem_destroy(s->nmem);
 131             s = s_next;
 132         }
 133         yaz_mutex_destroy(&hs->mutex);
 134         xfree(hs);
 135     }
 136 }
 137
 138 void http_session_destroy(struct http_session *s);
 139
 140 static void session_timeout(IOCHAN i, int event)
 141 {
 142     struct http_session *s = iochan_getdata(i);
 143     http_session_destroy(s);
 144 }
 145
 146 struct http_session *http_session_create(struct conf_service *service,
 147                                          http_sessions_t http_sessions,
 148                                          unsigned int sesid)
 149 {
 150     NMEM nmem = nmem_create();
 151     struct http_session *r = nmem_malloc(nmem, sizeof(*r));
 152     char tmp_str[50];
 153
 154     sprintf(tmp_str, "session#%u", sesid);
 155     r->psession = new_session(nmem, service, sesid);
 156     r->session_id = sesid;
 157     r->timestamp = 0;
 158     r->nmem = nmem;
 159     r->destroy_counter = r->activity_counter = 0;
 160     r->http_sessions = http_sessions;
 161
 162     yaz_mutex_enter(http_sessions->mutex);
 163     r->next = http_sessions->session_list;
 164     http_sessions->session_list = r;
 165     yaz_mutex_leave(http_sessions->mutex);
 166
 167     r->timeout_iochan = iochan_create(-1, session_timeout, 0, "http_session_timeout");
 168     iochan_setdata(r->timeout_iochan, r);
 169     yaz_log(http_sessions->log_level, "%p Session %u created. timeout chan=%p timeout=%d", r, sesid, r->timeout_iochan, service->session_timeout);
 170     iochan_settimeout(r->timeout_iochan, service->session_timeout);
 171
 172     iochan_add(service->server->iochan_man, r->timeout_iochan);
 173     http_session_use(1);
 174     return r;
 175 }
 176
 177 void http_session_destroy(struct http_session *s)
 178 {
 179     int must_destroy = 0;
 180
 181     http_sessions_t http_sessions = s->http_sessions;
 182
 183     yaz_log(http_sessions->log_level, "%p HTTP Session %u destroyed", s, s->session_id);
 184     yaz_mutex_enter(http_sessions->mutex);
 185     /* only if http_session has no active http sessions on it can be destroyed */
 186     if (s->destroy_counter == s->activity_counter)
 187     {
 188         struct http_session **p = 0;
 189         must_destroy = 1;
 190         for (p = &http_sessions->session_list; *p; p = &(*p)->next)
 191             if (*p == s)
 192             {
 193                 *p = (*p)->next;
 194                 break;
 195             }
 196     }
 197     yaz_mutex_leave(http_sessions->mutex);
 198     if (must_destroy)
 199     {   /* destroying for real */
 200         yaz_log(http_sessions->log_level, "%p HTTP Session %u destroyed", s, s->session_id);
 201         iochan_destroy(s->timeout_iochan);
 202         session_destroy(s->psession);
 203         http_session_use(-1);
 204         nmem_destroy(s->nmem);
 205     }
 206     else {
 207         yaz_log(http_sessions->log_level, "%p HTTP Session %u destroyed delayed. Active clients (%d-%d). Waiting for new timeout.",
 208                 s, s->session_id, s->activity_counter, s->destroy_counter);
 209     }
 210
 211 }
 212
 213 static const char *get_msg(enum pazpar2_error_code code)
 214 {
 215     struct pazpar2_error_msg {
 216         enum pazpar2_error_code code;
 217         const char *msg;
 218     };
 219     static const struct pazpar2_error_msg ar[] = {
 220         { PAZPAR2_NO_SESSION, "Session does not exist or it has expired"},
 221         { PAZPAR2_MISSING_PARAMETER, "Missing parameter"},
 222         { PAZPAR2_MALFORMED_PARAMETER_VALUE, "Malformed parameter value"},
 223         { PAZPAR2_MALFORMED_PARAMETER_ENCODING, "Malformed parameter encoding"},
 224         { PAZPAR2_MALFORMED_SETTING, "Malformed setting argument"},
 225         { PAZPAR2_HITCOUNTS_FAILED, "Failed to retrieve hitcounts"},
 226         { PAZPAR2_RECORD_MISSING, "Record missing"},
 227         { PAZPAR2_NO_TARGETS, "No targets"},
 228         { PAZPAR2_CONFIG_TARGET, "Target cannot be configured"},
 229         { PAZPAR2_RECORD_FAIL, "Record command failed"},
 230         { PAZPAR2_NOT_IMPLEMENTED, "Not implemented"},
 231         { PAZPAR2_NO_SERVICE, "No service"},
 232         { PAZPAR2_ALREADY_BLOCKED, "Already blocked in session on: "},
 233         { PAZPAR2_LAST_ERROR, "Last error"},
 234         { 0, 0 }
 235     };
 236     int i = 0;
 237     while (ar[i].msg)
 238     {
 239         if (code == ar[i].code)
 240             return ar[i].msg;
 241         i++;
 242     }
 243     return "No error";
 244 }
 245
 246 static void error(struct http_response *rs,
 247                   enum pazpar2_error_code code,
 248                   const char *addinfo)
 249 {
 250     struct http_channel *c = rs->channel;
 251     WRBUF text = wrbuf_alloc();
 252     const char *http_status = "417";
 253     const char *msg = get_msg(code);
 254
 255     rs->msg = nmem_strdup(c->nmem, msg);
 256     strcpy(rs->code, http_status);
 257
 258     wrbuf_printf(text, HTTP_COMMAND_RESPONSE_PREFIX "<error code=\"%d\" msg=\"%s\">", (int) code,
 259                msg);
 260     if (addinfo)
 261         wrbuf_xmlputs(text, addinfo);
 262     wrbuf_puts(text, "</error>");
 263
 264     yaz_log(YLOG_WARN, "HTTP %s %s%s%s", http_status,
 265             msg, addinfo ? ": " : "" , addinfo ? addinfo : "");
 266     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(text));
 267     wrbuf_destroy(text);
 268     http_send_response(c);
 269 }
 270
 271 static void response_open_no_status(struct http_channel *c, const char *command)
 272 {
 273     wrbuf_rewind(c->wrbuf);
 274     wrbuf_printf(c->wrbuf, "%s<%s>",
 275                  HTTP_COMMAND_RESPONSE_PREFIX, command);
 276 }
 277
 278 static void response_open(struct http_channel *c, const char *command)
 279 {
 280     response_open_no_status(c, command);
 281     wrbuf_puts(c->wrbuf, "<status>OK</status>");
 282 }
 283
 284 static void response_close(struct http_channel *c, const char *command)
 285 {
 286     struct http_response *rs = c->response;
 287
 288     wrbuf_printf(c->wrbuf, "</%s>", command);
 289     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 290     http_send_response(c);
 291 }
 292
 293 unsigned int make_sessionid(void)
 294 {
 295     static int seq = 0; /* thread pr */
 296     unsigned int res;
 297
 298     seq++;
 299     if (global_parameters.predictable_sessions)
 300         res = seq;
 301     else
 302     {
 303 #ifdef WIN32
 304         res = seq;
 305 #else
 306         struct timeval t;
 307
 308         if (gettimeofday(&t, 0) < 0)
 309         {
 310             yaz_log(YLOG_WARN|YLOG_ERRNO, "gettimeofday");
 311             exit(1);
 312         }
 313         /* at most 256 sessions per second ..
 314            (long long would be more appropriate)*/
 315         res = t.tv_sec;
 316         res = ((res << 8) | (seq & 0xff)) & ((1U << 31) - 1);
 317 #endif
 318     }
 319     return res;
 320 }
 321
 322 static struct http_session *locate_session(struct http_channel *c)
 323 {
 324     struct http_request *rq = c->request;
 325     struct http_response *rs = c->response;
 326     struct http_session *p;
 327     const char *session = http_argbyname(rq, "session");
 328     http_sessions_t http_sessions = c->http_sessions;
 329     unsigned int id;
 330
 331     if (!session)
 332     {
 333         error(rs, PAZPAR2_MISSING_PARAMETER, "session");
 334         return 0;
 335     }
 336     id = atoi(session);
 337     yaz_mutex_enter(http_sessions->mutex);
 338     for (p = http_sessions->session_list; p; p = p->next)
 339         if (id == p->session_id)
 340             break;
 341     if (p)
 342         p->activity_counter++;
 343     yaz_mutex_leave(http_sessions->mutex);
 344     if (p)
 345         iochan_activity(p->timeout_iochan);
 346     else
 347         error(rs, PAZPAR2_NO_SESSION, session);
 348     return p;
 349 }
 350
 351 // Call after use of locate_session, in order to increment the destroy_counter
 352 static void release_session(struct http_channel *c,
 353                             struct http_session *session)
 354 {
 355     http_sessions_t http_sessions = c->http_sessions;
 356     yaz_mutex_enter(http_sessions->mutex);
 357     if (session)
 358         session->destroy_counter++;
 359     yaz_mutex_leave(http_sessions->mutex);
 360 }
 361
 362 // Decode settings parameters and apply to session
 363 // Syntax: setting[target]=value
 364 static int process_settings(struct session *se, struct http_request *rq,
 365                             struct http_response *rs)
 366 {
 367     struct http_argument *a;
 368
 369     for (a = rq->arguments; a; a = a->next)
 370         if (strchr(a->name, '['))
 371         {
 372             char **res;
 373             int num;
 374             char *dbname;
 375             char *setting;
 376
 377             // Nmem_strsplit *rules*!!!
 378             nmem_strsplit(se->session_nmem, "[]", a->name, &res, &num);
 379             if (num != 2)
 380             {
 381                 error(rs, PAZPAR2_MALFORMED_SETTING, a->name);
 382                 return -1;
 383             }
 384             setting = res[0];
 385             dbname = res[1];
 386             session_apply_setting(se, dbname, setting,
 387                     nmem_strdup(se->session_nmem, a->value));
 388         }
 389     return 0;
 390 }
 391
 392 static void cmd_exit(struct http_channel *c)
 393 {
 394     yaz_log(YLOG_WARN, "exit");
 395
 396     response_open(c, "exit");
 397     response_close(c, "exit");
 398     http_close_server(c->server);
 399 }
 400
 401 static void cmd_init(struct http_channel *c)
 402 {
 403     struct http_request *r = c->request;
 404     const char *clear = http_argbyname(r, "clear");
 405     const char *content_type = http_lookup_header(r->headers, "Content-Type");
 406     unsigned int sesid;
 407     struct http_session *s;
 408     struct http_response *rs = c->response;
 409     struct conf_service *service = 0; /* no service (yet) */
 410
 411     if (r->content_len && content_type &&
 412         !yaz_strcmp_del("text/xml", content_type, "; "))
 413     {
 414         xmlDoc *doc = xmlParseMemory(r->content_buf, r->content_len);
 415         xmlNode *root_n;
 416         if (!doc)
 417         {
 418             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 419             return;
 420         }
 421         root_n = xmlDocGetRootElement(doc);
 422         service = service_create(c->server, root_n);
 423         xmlFreeDoc(doc);
 424         if (!service)
 425         {
 426             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 427             return;
 428         }
 429     }
 430
 431     if (!service)
 432     {
 433         const char *service_name = http_argbyname(c->request, "service");
 434         service = locate_service(c->server, service_name);
 435         if (!service)
 436         {
 437             error(rs, PAZPAR2_NO_SERVICE, service_name ? service_name : "unnamed");
 438             return;
 439         }
 440     }
 441     sesid = make_sessionid();
 442     s = http_session_create(service, c->http_sessions, sesid);
 443
 444     yaz_log(c->http_sessions->log_level, "%p Session init %u ", s, sesid);
 445     if (!clear || *clear == '0')
 446         session_init_databases(s->psession);
 447     else
 448         yaz_log(YLOG_LOG, "HTTP Session %u init: No databases preloaded", sesid);
 449
 450     if (process_settings(s->psession, c->request, c->response) < 0)
 451         return;
 452
 453     response_open(c, "init");
 454     wrbuf_printf(c->wrbuf, "<session>%d", sesid);
 455     if (c->server->server_id)
 456     {
 457         wrbuf_puts(c->wrbuf, ".");
 458         wrbuf_puts(c->wrbuf, c->server->server_id);
 459     }
 460     wrbuf_puts(c->wrbuf, "</session>"
 461                "<protocol>" PAZPAR2_PROTOCOL_VERSION "</protocol>");
 462
 463     response_close(c, "init");
 464 }
 465
 466 static void apply_local_setting(void *client_data,
 467                                 struct setting *set)
 468 {
 469     struct session *se =  (struct session *) client_data;
 470
 471     session_apply_setting(se, nmem_strdup(se->session_nmem, set->target),
 472                           nmem_strdup(se->session_nmem, set->name),
 473                           nmem_strdup(se->session_nmem, set->value));
 474 }
 475
 476 static void cmd_settings(struct http_channel *c)
 477 {
 478     struct http_response *rs = c->response;
 479     struct http_request *rq = c->request;
 480     struct http_session *s = locate_session(c);
 481     const char *content_type = http_lookup_header(rq->headers, "Content-Type");
 482
 483     if (!s)
 484         return;
 485
 486     if (rq->content_len && content_type &&
 487         !yaz_strcmp_del("text/xml", content_type, "; "))
 488     {
 489         xmlDoc *doc = xmlParseMemory(rq->content_buf, rq->content_len);
 490         xmlNode *root_n;
 491         if (!doc)
 492         {
 493             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 494             return;
 495         }
 496         root_n = xmlDocGetRootElement(doc);
 497
 498         settings_read_node_x(root_n, s->psession, apply_local_setting);
 499
 500         xmlFreeDoc(doc);
 501     }
 502     if (process_settings(s->psession, rq, rs) < 0)
 503     {
 504         release_session(c, s);
 505         return;
 506     }
 507     response_open(c, "settings");
 508     response_close(c, "settings");
 509     release_session(c, s);
 510 }
 511
 512 static void termlist_response(struct http_channel *c)
 513 {
 514     struct http_request *rq = c->request;
 515     struct http_session *s = locate_session(c);
 516     const char *name = http_argbyname(rq, "name");
 517     const char *nums = http_argbyname(rq, "num");
 518     int num = 15;
 519     int status;
 520
 521     if (nums)
 522         num = atoi(nums);
 523
 524     status = session_active_clients(s->psession);
 525
 526     response_open_no_status(c, "termlist");
 527     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", status);
 528
 529     perform_termlist(c, s->psession, name, num);
 530
 531     response_close(c, "termlist");
 532     release_session(c, s);
 533 }
 534
 535 static void termlist_result_ready(void *data)
 536 {
 537     struct http_channel *c = (struct http_channel *) data;
 538     yaz_log(c->http_sessions->log_level, "termlist watch released");
 539     termlist_response(c);
 540 }
 541
 542 static void cmd_termlist(struct http_channel *c)
 543 {
 544     struct http_request *rq = c->request;
 545     struct http_response *rs = c->response;
 546     struct http_session *s = locate_session(c);
 547     const char *block = http_argbyname(rq, "block");
 548     int active_clients;
 549     if (!s)
 550         return;
 551
 552     active_clients = session_active_clients(s->psession);
 553
 554     if (block && !strcmp("1", block) && active_clients)
 555     {
 556         // if there is already a watch/block. we do not block this one
 557         if (session_set_watch(s->psession, SESSION_WATCH_TERMLIST,
 558                               termlist_result_ready, c, c) != 0)
 559         {
 560             yaz_log(YLOG_WARN, "Attempt to block multiple times on termlist block. Not supported!");
 561             error(rs, PAZPAR2_ALREADY_BLOCKED, "termlist");
 562         }
 563         else
 564         {
 565             yaz_log(c->http_sessions->log_level, "%p Session %u: Blocking on command termlist", s, s->session_id);
 566         }
 567         release_session(c, s);
 568         return;
 569     }
 570
 571     termlist_response(c);
 572     release_session(c, s);
 573 }
 574
 575 size_t session_get_memory_status(struct session *session);
 576
 577 static void session_status(struct http_channel *c, struct http_session *s)
 578 {
 579     size_t session_nmem;
 580     wrbuf_printf(c->wrbuf, "<http_count>%u</http_count>\n", s->activity_counter);
 581     wrbuf_printf(c->wrbuf, "<http_nmem>%zu</http_nmem>\n", nmem_total(s->nmem) );
 582     session_nmem = session_get_memory_status(s->psession);
 583     wrbuf_printf(c->wrbuf, "<session_nmem>%zu</session_nmem>\n", session_nmem);
 584 }
 585
 586 static void cmd_session_status(struct http_channel *c)
 587 {
 588     struct http_session *s = locate_session(c);
 589     if (!s)
 590         return;
 591
 592     response_open(c, "session-status");
 593     session_status(c, s);
 594     response_close(c, "session-status");
 595     release_session(c, s);
 596 }
 597
 598 int sessions_count(void);
 599 int clients_count(void);
 600 #ifdef HAVE_RESULTSETS_COUNT
 601 int resultsets_count(void);
 602 #else
 603 #define resultsets_count()      0
 604 #endif
 605
 606 static void cmd_server_status(struct http_channel *c)
 607 {
 608     int sessions   = sessions_count();
 609     int clients    = clients_count();
 610     int resultsets = resultsets_count();
 611
 612     response_open(c, "server-status");
 613     wrbuf_printf(c->wrbuf, "\n  <sessions>%u</sessions>\n", sessions);
 614     wrbuf_printf(c->wrbuf, "  <clients>%u</clients>\n",   clients);
 615     /* Only works if yaz has been compiled with enabling of this */
 616     wrbuf_printf(c->wrbuf, "  <resultsets>%u</resultsets>\n",resultsets);
 617     print_meminfo(c->wrbuf);
 618
 619 /* TODO add all sessions status                         */
 620 /*    http_sessions_t http_sessions = c->http_sessions; */
 621 /*    struct http_session *p;                           */
 622 /*
 623     yaz_mutex_enter(http_sessions->mutex);
 624     for (p = http_sessions->session_list; p; p = p->next)
 625     {
 626         p->activity_counter++;
 627         wrbuf_puts(c->wrbuf, "<session-status>\n");
 628         wrbuf_printf(c->wrbuf, "<id>%s</id>\n", p->session_id);
 629         yaz_mutex_leave(http_sessions->mutex);
 630         session_status(c, p);
 631         wrbuf_puts(c->wrbuf, "</session-status>\n");
 632         yaz_mutex_enter(http_sessions->mutex);
 633         p->activity_counter--;
 634     }
 635     yaz_mutex_leave(http_sessions->mutex);
 636 */
 637     response_close(c, "server-status");
 638     xmalloc_trav(0);
 639 }
 640
 641 static void bytarget_response(struct http_channel *c) {
 642     int count, i;
 643     struct hitsbytarget *ht;
 644     struct http_request *rq = c->request;
 645     const char *settings = http_argbyname(rq, "settings");
 646     struct http_session *s = locate_session(c);
 647
 648     ht = get_hitsbytarget(s->psession, &count, c->nmem);
 649     response_open(c, "bytarget");
 650     if (count == 0)
 651         yaz_log(YLOG_WARN, "Empty bytarget Response. No targets found!");
 652     for (i = 0; i < count; i++)
 653     {
 654         wrbuf_puts(c->wrbuf, "\n<target>");
 655
 656         wrbuf_puts(c->wrbuf, "<id>");
 657         wrbuf_xmlputs(c->wrbuf, ht[i].id);
 658         wrbuf_puts(c->wrbuf, "</id>\n");
 659
 660         if (ht[i].name && ht[i].name[0])
 661         {
 662             wrbuf_puts(c->wrbuf, "<name>");
 663             wrbuf_xmlputs(c->wrbuf, ht[i].name);
 664             wrbuf_puts(c->wrbuf, "</name>\n");
 665         }
 666
 667         wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", ht[i].hits);
 668         wrbuf_printf(c->wrbuf, "<diagnostic>%d</diagnostic>\n", ht[i].diagnostic);
 669         wrbuf_printf(c->wrbuf, "<records>%d</records>\n", ht[i].records);
 670
 671         wrbuf_puts(c->wrbuf, "<state>");
 672         wrbuf_xmlputs(c->wrbuf, ht[i].state);
 673         wrbuf_puts(c->wrbuf, "</state>\n");
 674         if (settings && *settings == '1')
 675         {
 676             wrbuf_puts(c->wrbuf, "<settings>\n");
 677             wrbuf_puts(c->wrbuf, ht[i].settings_xml);
 678             wrbuf_puts(c->wrbuf, "</settings>\n");
 679         }
 680         if (ht[i].suggestions_xml && ht[i].suggestions_xml[0]) {
 681             wrbuf_puts(c->wrbuf, "<suggestions>");
 682             wrbuf_puts(c->wrbuf, ht[i].suggestions_xml);
 683             wrbuf_puts(c->wrbuf, "</suggestions>");
 684         }
 685         wrbuf_puts(c->wrbuf, "</target>");
 686     }
 687     response_close(c, "bytarget");
 688     release_session(c, s);
 689 }
 690
 691 static void bytarget_result_ready(void *data)
 692 {
 693     struct http_channel *c = (struct http_channel *) data;
 694     yaz_log(c->http_sessions->log_level, "bytarget watch released");
 695     bytarget_response(c);
 696 }
 697
 698
 699 static void cmd_bytarget(struct http_channel *c)
 700 {
 701     struct http_request *rq = c->request;
 702     struct http_response *rs = c->response;
 703     struct http_session *s = locate_session(c);
 704     const char *block = http_argbyname(rq, "block");
 705     int no_active;
 706
 707     if (!s)
 708         return;
 709
 710     no_active = session_active_clients(s->psession);
 711
 712     if (block && !strcmp("1",block) && no_active)
 713     {
 714         // if there is already a watch/block. we do not block this one
 715         if (session_set_watch(s->psession, SESSION_WATCH_BYTARGET,
 716                               bytarget_result_ready, c, c) != 0)
 717         {
 718             yaz_log(YLOG_WARN, "Attempt to block multiple times on bytarget block. Not supported!");
 719             error(rs, PAZPAR2_ALREADY_BLOCKED, "bytarget");
 720         }
 721         else
 722         {
 723             yaz_log(c->http_sessions->log_level, "%p Session %u: Blocking on command bytarget", s, s->session_id);
 724         }
 725         release_session(c, s);
 726         return;
 727     }
 728     bytarget_response(c);
 729     release_session(c, s);
 730 }
 731
 732 static void write_metadata(WRBUF w, struct conf_service *service,
 733         struct record_metadata **ml, int full)
 734 {
 735     int imeta;
 736
 737     for (imeta = 0; imeta < service->num_metadata; imeta++)
 738     {
 739         struct conf_metadata *cmd = &service->metadata[imeta];
 740         struct record_metadata *md;
 741         if (!cmd->brief && !full)
 742             continue;
 743         for (md = ml[imeta]; md; md = md->next)
 744         {
 745             struct record_metadata_attr *attr = md->attributes;
 746             wrbuf_printf(w, "\n<md-%s", cmd->name);
 747
 748             for (; attr; attr = attr->next)
 749             {
 750                 wrbuf_printf(w, " %s=\"", attr->name);
 751                 wrbuf_xmlputs(w, attr->value);
 752                 wrbuf_puts(w, "\"");
 753             }
 754             wrbuf_puts(w, ">");
 755             switch (cmd->type)
 756             {
 757                 case Metadata_type_generic:
 758                     wrbuf_xmlputs(w, md->data.text.disp);
 759                     break;
 760                 case Metadata_type_year:
 761                     wrbuf_printf(w, "%d", md->data.number.min);
 762                     if (md->data.number.min != md->data.number.max)
 763                         wrbuf_printf(w, "-%d", md->data.number.max);
 764                     break;
 765                 default:
 766                     wrbuf_puts(w, "[can't represent]");
 767             }
 768             wrbuf_printf(w, "</md-%s>", cmd->name);
 769         }
 770     }
 771 }
 772
 773 static void write_subrecord(struct record *r, WRBUF w,
 774         struct conf_service *service, int show_details)
 775 {
 776     const char *name = session_setting_oneval(
 777         client_get_database(r->client), PZ_NAME);
 778
 779     wrbuf_puts(w, "<location id=\"");
 780     wrbuf_xmlputs(w, client_get_id(r->client));
 781     wrbuf_puts(w, "\" ");
 782
 783     wrbuf_puts(w, "name=\"");
 784     wrbuf_xmlputs(w,  *name ? name : "Unknown");
 785     wrbuf_puts(w, "\">");
 786
 787     write_metadata(w, service, r->metadata, show_details);
 788     wrbuf_puts(w, "</location>\n");
 789 }
 790
 791 static void show_raw_record_error(void *data, const char *addinfo)
 792 {
 793     http_channel_observer_t obs = data;
 794     struct http_channel *c = http_channel_observer_chan(obs);
 795     struct http_response *rs = c->response;
 796
 797     http_remove_observer(obs);
 798
 799     error(rs, PAZPAR2_RECORD_FAIL, addinfo);
 800 }
 801
 802 static void show_raw_record_ok(void *data, const char *buf, size_t sz)
 803 {
 804     http_channel_observer_t obs = data;
 805     struct http_channel *c = http_channel_observer_chan(obs);
 806     struct http_response *rs = c->response;
 807
 808     http_remove_observer(obs);
 809
 810     wrbuf_write(c->wrbuf, buf, sz);
 811     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 812     http_send_response(c);
 813 }
 814
 815
 816 static void show_raw_record_ok_binary(void *data, const char *buf, size_t sz)
 817 {
 818     http_channel_observer_t obs = data;
 819     struct http_channel *c = http_channel_observer_chan(obs);
 820     struct http_response *rs = c->response;
 821
 822     http_remove_observer(obs);
 823
 824     wrbuf_write(c->wrbuf, buf, sz);
 825     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 826
 827     rs->content_type = "application/octet-stream";
 828     http_send_response(c);
 829 }
 830
 831
 832 void show_raw_reset(void *data, struct http_channel *c, void *data2)
 833 {
 834     //struct client *client = data;
 835     //client_show_raw_remove(client, data2);
 836 }
 837
 838 static void cmd_record_ready(void *data);
 839
 840 static void cmd_record(struct http_channel *c)
 841 {
 842     struct http_response *rs = c->response;
 843     struct http_request *rq = c->request;
 844     struct http_session *s = locate_session(c);
 845     struct record_cluster *rec, *prev_r, *next_r;
 846     struct record *r;
 847     struct conf_service *service;
 848     const char *idstr = http_argbyname(rq, "id");
 849     const char *offsetstr = http_argbyname(rq, "offset");
 850     const char *binarystr = http_argbyname(rq, "binary");
 851
 852     if (!s)
 853         return;
 854     service = s->psession->service;
 855     if (!idstr)
 856     {
 857         error(rs, PAZPAR2_MISSING_PARAMETER, "id");
 858         return;
 859     }
 860     wrbuf_rewind(c->wrbuf);
 861     if (!(rec = show_single_start(s->psession, idstr, &prev_r, &next_r)))
 862     {
 863         if (session_active_clients(s->psession) == 0)
 864         {
 865             error(rs, PAZPAR2_RECORD_MISSING, idstr);
 866         }
 867         else if (session_set_watch(s->psession, SESSION_WATCH_RECORD,
 868                               cmd_record_ready, c, c) != 0)
 869         {
 870             error(rs, PAZPAR2_RECORD_MISSING, idstr);
 871         }
 872         release_session(c, s);
 873         return;
 874     }
 875     if (offsetstr)
 876     {
 877         int offset = atoi(offsetstr);
 878         const char *syntax = http_argbyname(rq, "syntax");
 879         const char *esn = http_argbyname(rq, "esn");
 880         int i;
 881         struct record*r = rec->records;
 882         int binary = 0;
 883
 884         if (binarystr && *binarystr != '0')
 885             binary = 1;
 886
 887         for (i = 0; i < offset && r; r = r->next, i++)
 888             ;
 889         if (!r)
 890         {
 891             error(rs, PAZPAR2_RECORD_FAIL, "no record at offset given");
 892         }
 893         else
 894         {
 895             http_channel_observer_t obs =
 896                 http_add_observer(c, r->client, show_raw_reset);
 897             int ret = client_show_raw_begin(r->client, r->position,
 898                                         syntax, esn,
 899                                         obs /* data */,
 900                                         show_raw_record_error,
 901                                         (binary ?
 902                                          show_raw_record_ok_binary :
 903                                          show_raw_record_ok),
 904                                         (binary ? 1 : 0));
 905             if (ret == -1)
 906             {
 907                 http_remove_observer(obs);
 908                 error(rs, PAZPAR2_NO_SESSION, 0);
 909             }
 910         }
 911     }
 912     else
 913     {
 914         response_open_no_status(c, "record");
 915         wrbuf_puts(c->wrbuf, "\n<recid>");
 916         wrbuf_xmlputs(c->wrbuf, rec->recid);
 917         wrbuf_puts(c->wrbuf, "</recid>\n");
 918         if (prev_r)
 919         {
 920             wrbuf_puts(c->wrbuf, "<prevrecid>");
 921             wrbuf_xmlputs(c->wrbuf, prev_r->recid);
 922             wrbuf_puts(c->wrbuf, "</prevrecid>\n");
 923         }
 924         if (next_r)
 925         {
 926             wrbuf_puts(c->wrbuf, "<nextrecid>");
 927             wrbuf_xmlputs(c->wrbuf, next_r->recid);
 928             wrbuf_puts(c->wrbuf, "</nextrecid>\n");
 929         }
 930         wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n",
 931                      session_active_clients(s->psession));
 932         write_metadata(c->wrbuf, service, rec->metadata, 1);
 933         for (r = rec->records; r; r = r->next)
 934             write_subrecord(r, c->wrbuf, service, 1);
 935         response_close(c, "record");
 936     }
 937     show_single_stop(s->psession, rec);
 938     release_session(c, s);
 939 }
 940
 941 static void cmd_record_ready(void *data)
 942 {
 943     struct http_channel *c = (struct http_channel *) data;
 944     yaz_log(c->http_sessions->log_level, "record watch released");
 945     cmd_record(c);
 946 }
 947
 948 static void show_records(struct http_channel *c, int active)
 949 {
 950     struct http_request *rq = c->request;
 951     struct http_response *rs = c->response;
 952     struct http_session *s = locate_session(c);
 953     struct record_cluster **rl;
 954     struct reclist_sortparms *sp;
 955     const char *start = http_argbyname(rq, "start");
 956     const char *num = http_argbyname(rq, "num");
 957     const char *sort = http_argbyname(rq, "sort");
 958     int startn = 0;
 959     int numn = 20;
 960     int total;
 961     Odr_int total_hits;
 962     int i;
 963
 964     if (!s)
 965         return;
 966
 967     // We haven't counted clients yet if we're called on a block release
 968     if (active < 0)
 969         active = session_active_clients(s->psession);
 970
 971     if (start)
 972         startn = atoi(start);
 973     if (num)
 974         numn = atoi(num);
 975     if (!sort)
 976         sort = "relevance";
 977     if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
 978     {
 979         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
 980         release_session(c, s);
 981         return;
 982
 983     }
 984
 985
 986     rl = show_range_start(s->psession, sp, startn, &numn, &total, &total_hits);
 987
 988     response_open(c, "show");
 989     wrbuf_printf(c->wrbuf, "\n<activeclients>%d</activeclients>\n", active);
 990     wrbuf_printf(c->wrbuf, "<merged>%d</merged>\n", total);
 991     wrbuf_printf(c->wrbuf, "<total>" ODR_INT_PRINTF "</total>\n", total_hits);
 992     wrbuf_printf(c->wrbuf, "<start>%d</start>\n", startn);
 993     wrbuf_printf(c->wrbuf, "<num>%d</num>\n", numn);
 994
 995     for (i = 0; i < numn; i++)
 996     {
 997         int ccount;
 998         struct record *p;
 999         struct record_cluster *rec = rl[i];
1000         struct conf_service *service = s->psession->service;
1001
1002         wrbuf_puts(c->wrbuf, "<hit>\n");
1003         write_metadata(c->wrbuf, service, rec->metadata, 0);
1004         for (ccount = 0, p = rl[i]->records; p;  p = p->next, ccount++)
1005             write_subrecord(p, c->wrbuf, service, 0); // subrecs w/o details
1006         if (ccount > 1)
1007             wrbuf_printf(c->wrbuf, "<count>%d</count>\n", ccount);
1008         if (strstr(sort, "relevance"))
1009             wrbuf_printf(c->wrbuf, "<relevance>%d</relevance>\n",
1010                          rec->relevance_score);
1011         wrbuf_puts(c->wrbuf, "<recid>");
1012         wrbuf_xmlputs(c->wrbuf, rec->recid);
1013         wrbuf_puts(c->wrbuf, "</recid>\n");
1014         wrbuf_puts(c->wrbuf, "</hit>\n");
1015     }
1016
1017     show_range_stop(s->psession, rl);
1018
1019     response_close(c, "show");
1020     release_session(c, s);
1021 }
1022
1023 static void show_records_ready(void *data)
1024 {
1025     struct http_channel *c = (struct http_channel *) data;
1026     yaz_log(c->http_sessions->log_level, "show watch released");
1027     show_records(c, -1);
1028 }
1029
1030 static void cmd_show(struct http_channel *c)
1031 {
1032     struct http_request  *rq = c->request;
1033     struct http_response *rs = c->response;
1034     struct http_session *s = locate_session(c);
1035     const char *block = http_argbyname(rq, "block");
1036     const char *sort = http_argbyname(rq, "sort");
1037     struct reclist_sortparms *sp;
1038     int status;
1039
1040     if (!s)
1041         return;
1042
1043     if (!sort)
1044         sort = "relevance";
1045
1046     if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
1047     {
1048         error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
1049         release_session(c, s);
1050         return;
1051     }
1052     session_sort(s->psession, sp->name, sp->increasing);
1053
1054     status = session_active_clients(s->psession);
1055
1056     if (block)
1057     {
1058         if (!strcmp(block, "preferred") && !session_is_preferred_clients_ready(s->psession) && reclist_get_num_records(s->psession->reclist) == 0)
1059         {
1060             // if there is already a watch/block. we do not block this one
1061             if (session_set_watch(s->psession, SESSION_WATCH_SHOW_PREF,
1062                                   show_records_ready, c, c) == 0)
1063             {
1064                 yaz_log(c->http_sessions->log_level,
1065                         "%p Session %u: Blocking on command show (preferred targets)", s, s->session_id);
1066             }
1067             else
1068             {
1069                 yaz_log(YLOG_WARN, "Attempt to block multiple times on show (preferred targets) block. Not supported!");
1070                 error(rs, PAZPAR2_ALREADY_BLOCKED, "show (preferred targets)");
1071             }
1072             release_session(c, s);
1073             return;
1074
1075         }
1076         else if (status)
1077         {
1078             // if there is already a watch/block. we do not block this one
1079             if (session_set_watch(s->psession, SESSION_WATCH_SHOW,
1080                                   show_records_ready, c, c) != 0)
1081             {
1082                 yaz_log(YLOG_WARN, "Attempt to block multiple times on show block. Not supported!");
1083                 error(rs, PAZPAR2_ALREADY_BLOCKED, "show");
1084             }
1085             else
1086             {
1087                 yaz_log(c->http_sessions->log_level, "%p Session %u: Blocking on command show", s, s->session_id);
1088             }
1089             release_session(c, s);
1090             return;
1091         }
1092     }
1093     show_records(c, status);
1094     release_session(c, s);
1095 }
1096
1097 static void cmd_ping(struct http_channel *c)
1098 {
1099     struct http_session *s = locate_session(c);
1100     if (!s)
1101         return;
1102     response_open(c, "ping");
1103     response_close(c, "ping");
1104     release_session(c, s);
1105 }
1106
1107 static void cmd_search(struct http_channel *c)
1108 {
1109     struct http_request *rq = c->request;
1110     struct http_response *rs = c->response;
1111     struct http_session *s = locate_session(c);
1112     const char *query = http_argbyname(rq, "query");
1113     const char *filter = http_argbyname(rq, "filter");
1114     const char *maxrecs = http_argbyname(rq, "maxrecs");
1115     const char *startrecs = http_argbyname(rq, "startrecs");
1116     const char *limit = http_argbyname(rq, "limit");
1117     enum pazpar2_error_code code;
1118     const char *addinfo = 0;
1119
1120     if (!s)
1121         return;
1122     if (!query)
1123     {
1124         error(rs, PAZPAR2_MISSING_PARAMETER, "query");
1125         release_session(c, s);
1126         return;
1127     }
1128     if (!yaz_utf8_check(query))
1129     {
1130         error(rs, PAZPAR2_MALFORMED_PARAMETER_ENCODING, "query");
1131         release_session(c, s);
1132         return;
1133     }
1134     code = session_search(s->psession, query, startrecs, maxrecs, filter, limit,
1135                           &addinfo, "relevance", 0);
1136     if (code)
1137     {
1138         error(rs, code, addinfo);
1139         release_session(c, s);
1140         return;
1141     }
1142     response_open(c, "search");
1143     response_close(c, "search");
1144     release_session(c, s);
1145 }
1146
1147
1148 static void cmd_stat(struct http_channel *c)
1149 {
1150     struct http_session *s = locate_session(c);
1151     struct statistics stat;
1152     int clients;
1153
1154     float progress = 0;
1155
1156     if (!s)
1157         return;
1158
1159     clients = session_active_clients(s->psession);
1160     statistics(s->psession, &stat);
1161
1162     if (stat.num_clients > 0)
1163     {
1164         progress = (stat.num_clients  - clients) / (float)stat.num_clients;
1165     }
1166
1167     response_open_no_status(c, "stat");
1168     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", clients);
1169     wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", stat.num_hits);
1170     wrbuf_printf(c->wrbuf, "<records>%d</records>\n", stat.num_records);
1171     wrbuf_printf(c->wrbuf, "<clients>%d</clients>\n", stat.num_clients);
1172     wrbuf_printf(c->wrbuf, "<unconnected>%d</unconnected>\n", stat.num_no_connection);
1173     wrbuf_printf(c->wrbuf, "<connecting>%d</connecting>\n", stat.num_connecting);
1174     wrbuf_printf(c->wrbuf, "<working>%d</working>\n", stat.num_working);
1175     wrbuf_printf(c->wrbuf, "<idle>%d</idle>\n", stat.num_idle);
1176     wrbuf_printf(c->wrbuf, "<failed>%d</failed>\n", stat.num_failed);
1177     wrbuf_printf(c->wrbuf, "<error>%d</error>\n", stat.num_error);
1178     wrbuf_printf(c->wrbuf, "<progress>%.2f</progress>\n", progress);
1179     response_close(c, "stat");
1180     release_session(c, s);
1181 }
1182
1183 static void cmd_info(struct http_channel *c)
1184 {
1185     char yaz_version_str[20];
1186
1187     response_open_no_status(c, "info");
1188     wrbuf_puts(c->wrbuf, " <version>\n");
1189     wrbuf_puts(c->wrbuf, "  <pazpar2");
1190 #ifdef PAZPAR2_VERSION_SHA1
1191     wrbuf_printf(c->wrbuf, " sha1=\"%s\"", PAZPAR2_VERSION_SHA1);
1192 #endif
1193     wrbuf_puts(c->wrbuf, ">");
1194     wrbuf_xmlputs(c->wrbuf, VERSION);
1195     wrbuf_puts(c->wrbuf, "</pazpar2>");
1196
1197     yaz_version(yaz_version_str, 0);
1198     wrbuf_puts(c->wrbuf, "  <yaz compiled=\"");
1199     wrbuf_xmlputs(c->wrbuf, YAZ_VERSION);
1200     wrbuf_puts(c->wrbuf, "\">");
1201     wrbuf_xmlputs(c->wrbuf, yaz_version_str);
1202     wrbuf_puts(c->wrbuf, "</yaz>\n");
1203
1204     wrbuf_puts(c->wrbuf, " </version>\n");
1205
1206     info_services(c->server, c->wrbuf);
1207
1208     response_close(c, "info");
1209 }
1210
1211 struct {
1212     char *name;
1213     void (*fun)(struct http_channel *c);
1214 } commands[] = {
1215     { "init", cmd_init },
1216     { "settings", cmd_settings },
1217     { "stat", cmd_stat },
1218     { "bytarget", cmd_bytarget },
1219     { "show", cmd_show },
1220     { "search", cmd_search },
1221     { "termlist", cmd_termlist },
1222     { "exit", cmd_exit },
1223     { "session-status", cmd_session_status },
1224     { "server-status", cmd_server_status },
1225     { "ping", cmd_ping },
1226     { "record", cmd_record },
1227     { "info", cmd_info },
1228     {0,0}
1229 };
1230
1231 void http_command(struct http_channel *c)
1232 {
1233     const char *command = http_argbyname(c->request, "command");
1234     struct http_response *rs = http_create_response(c);
1235     int i;
1236
1237     c->response = rs;
1238
1239     http_addheader(rs, "Expires", "Thu, 19 Nov 1981 08:52:00 GMT");
1240     http_addheader(rs, "Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
1241
1242     if (!command)
1243     {
1244         error(rs, PAZPAR2_MISSING_PARAMETER, "command");
1245         return;
1246     }
1247     for (i = 0; commands[i].name; i++)
1248         if (!strcmp(commands[i].name, command))
1249         {
1250             (*commands[i].fun)(c);
1251             break;
1252         }
1253     if (!commands[i].name)
1254         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "command");
1255
1256     return;
1257 }
1258
1259 /*
1260  * Local variables:
1261  * c-basic-offset: 4
1262  * c-file-style: "Stroustrup"
1263  * indent-tabs-mode: nil
1264  * End:
1265  * vim: shiftwidth=4 tabstop=8 expandtab
1266  */
1267