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 // Update this when the protocol changes
  45 #define PAZPAR2_PROTOCOL_VERSION "1"
  46
  47 #define HTTP_COMMAND_RESPONSE_PREFIX "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
  48
  49 struct http_session {
  50     IOCHAN timeout_iochan;     // NOTE: This is NOT associated with a socket
  51     struct session *psession;
  52     unsigned int session_id;
  53     int timestamp;
  54     int destroy_counter;
  55     int activity_counter;
  56     NMEM nmem;
  57     http_sessions_t http_sessions;
  58     struct http_session *next;
  59 };
  60
  61 struct http_sessions {
  62     struct http_session *session_list;
  63     YAZ_MUTEX mutex;
  64     int log_level;
  65 };
  66
  67 static YAZ_MUTEX g_http_session_mutex = 0;
  68 static int g_http_sessions = 0;
  69
  70 int http_session_use(int delta)
  71 {
  72     int sessions;
  73     if (!g_http_session_mutex)
  74         yaz_mutex_create(&g_http_session_mutex);
  75     yaz_mutex_enter(g_http_session_mutex);
  76     g_http_sessions += delta;
  77     sessions = g_http_sessions;
  78     yaz_mutex_leave(g_http_session_mutex);
  79     yaz_log(YLOG_DEBUG, "%s sesions=%d", delta == 0 ? "" : (delta > 0 ? "INC" : "DEC"), sessions);
  80     return sessions;
  81
  82 }
  83
  84 http_sessions_t http_sessions_create(void)
  85 {
  86     http_sessions_t hs = xmalloc(sizeof(*hs));
  87     hs->session_list = 0;
  88     hs->mutex = 0;
  89     pazpar2_mutex_create(&hs->mutex, "http_sessions");
  90     hs->log_level = yaz_log_module_level("HTTP");
  91     return hs;
  92 }
  93
  94 void http_sessions_destroy(http_sessions_t hs)
  95 {
  96     if (hs)
  97     {
  98         struct http_session *s = hs->session_list;
  99         while (s)
 100         {
 101             struct http_session *s_next = s->next;
 102             iochan_destroy(s->timeout_iochan);
 103             destroy_session(s->psession);
 104             nmem_destroy(s->nmem);
 105             s = s_next;
 106         }
 107         yaz_mutex_destroy(&hs->mutex);
 108         xfree(hs);
 109     }
 110 }
 111
 112 void http_session_destroy(struct http_session *s);
 113
 114 static void session_timeout(IOCHAN i, int event)
 115 {
 116     struct http_session *s = iochan_getdata(i);
 117     http_session_destroy(s);
 118 }
 119
 120 struct http_session *http_session_create(struct conf_service *service,
 121                                          http_sessions_t http_sessions,
 122                                          unsigned int sesid)
 123 {
 124     NMEM nmem = nmem_create();
 125     struct http_session *r = nmem_malloc(nmem, sizeof(*r));
 126     char tmp_str[50];
 127
 128     sprintf(tmp_str, "session#%u", sesid);
 129     r->psession = new_session(nmem, service, sesid);
 130     r->session_id = sesid;
 131     r->timestamp = 0;
 132     r->nmem = nmem;
 133     r->destroy_counter = r->activity_counter = 0;
 134     r->http_sessions = http_sessions;
 135
 136     yaz_mutex_enter(http_sessions->mutex);
 137     r->next = http_sessions->session_list;
 138     http_sessions->session_list = r;
 139     yaz_mutex_leave(http_sessions->mutex);
 140
 141     r->timeout_iochan = iochan_create(-1, session_timeout, 0, "http_session_timeout");
 142     iochan_setdata(r->timeout_iochan, r);
 143     yaz_log(http_sessions->log_level, "%p Session %u created. timeout chan=%p timeout=%d", r, sesid, r->timeout_iochan, service->session_timeout);
 144     iochan_settimeout(r->timeout_iochan, service->session_timeout);
 145
 146     iochan_add(service->server->iochan_man, r->timeout_iochan);
 147     http_session_use(1);
 148     return r;
 149 }
 150
 151 void http_session_destroy(struct http_session *s)
 152 {
 153     int must_destroy = 0;
 154
 155     http_sessions_t http_sessions = s->http_sessions;
 156
 157     yaz_log(http_sessions->log_level, "%p HTTP Session %u destroyed", s, s->session_id);
 158     yaz_mutex_enter(http_sessions->mutex);
 159     /* only if http_session has no active http sessions on it can be destroyed */
 160     if (s->destroy_counter == s->activity_counter) {
 161         struct http_session **p = 0;
 162         must_destroy = 1;
 163         for (p = &http_sessions->session_list; *p; p = &(*p)->next)
 164             if (*p == s)
 165             {
 166                 *p = (*p)->next;
 167                 break;
 168             }
 169     }
 170     yaz_mutex_leave(http_sessions->mutex);
 171     if (must_destroy)
 172     {   /* destroying for real */
 173         yaz_log(http_sessions->log_level, "%p HTTP Session %u destroyed", s, s->session_id);
 174         iochan_destroy(s->timeout_iochan);
 175         destroy_session(s->psession);
 176         http_session_use(-1);
 177         nmem_destroy(s->nmem);
 178     }
 179     else {
 180         yaz_log(http_sessions->log_level, "%p HTTP Session %u destroyed delayed. Active clients (%d-%d). Waiting for new timeout.",
 181                 s, s->session_id, s->activity_counter, s->destroy_counter);
 182     }
 183
 184 }
 185
 186 static const char *get_msg(enum pazpar2_error_code code)
 187 {
 188     struct pazpar2_error_msg {
 189         enum pazpar2_error_code code;
 190         const char *msg;
 191     };
 192     static const struct pazpar2_error_msg ar[] = {
 193         { PAZPAR2_NO_SESSION, "Session does not exist or it has expired"},
 194         { PAZPAR2_MISSING_PARAMETER, "Missing parameter"},
 195         { PAZPAR2_MALFORMED_PARAMETER_VALUE, "Malformed parameter value"},
 196         { PAZPAR2_MALFORMED_PARAMETER_ENCODING, "Malformed parameter encoding"},
 197         { PAZPAR2_MALFORMED_SETTING, "Malformed setting argument"},
 198         { PAZPAR2_HITCOUNTS_FAILED, "Failed to retrieve hitcounts"},
 199         { PAZPAR2_RECORD_MISSING, "Record missing"},
 200         { PAZPAR2_NO_TARGETS, "No targets"},
 201         { PAZPAR2_CONFIG_TARGET, "Target cannot be configured"},
 202         { PAZPAR2_RECORD_FAIL, "Record command failed"},
 203         { PAZPAR2_NOT_IMPLEMENTED, "Not implemented"},
 204         { PAZPAR2_NO_SERVICE, "No service"},
 205         { PAZPAR2_LAST_ERROR, "Last error"},
 206         { 0, 0 }
 207     };
 208     int i = 0;
 209     while (ar[i].msg)
 210     {
 211         if (code == ar[i].code)
 212             return ar[i].msg;
 213         i++;
 214     }
 215     return "No error";
 216 }
 217
 218 static void error(struct http_response *rs,
 219                   enum pazpar2_error_code code,
 220                   const char *addinfo)
 221 {
 222     struct http_channel *c = rs->channel;
 223     WRBUF text = wrbuf_alloc();
 224     const char *http_status = "417";
 225     const char *msg = get_msg(code);
 226
 227     rs->msg = nmem_strdup(c->nmem, msg);
 228     strcpy(rs->code, http_status);
 229
 230     wrbuf_printf(text, HTTP_COMMAND_RESPONSE_PREFIX "<error code=\"%d\" msg=\"%s\">", (int) code,
 231                msg);
 232     if (addinfo)
 233         wrbuf_xmlputs(text, addinfo);
 234     wrbuf_puts(text, "</error>");
 235
 236     yaz_log(YLOG_WARN, "HTTP %s %s%s%s", http_status,
 237             msg, addinfo ? ": " : "" , addinfo ? addinfo : "");
 238     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(text));
 239     wrbuf_destroy(text);
 240     http_send_response(c);
 241 }
 242
 243 unsigned int make_sessionid(void)
 244 {
 245     static int seq = 0; /* thread pr */
 246     unsigned int res;
 247
 248     seq++;
 249     if (global_parameters.debug_mode)
 250         res = seq;
 251     else
 252     {
 253 #ifdef WIN32
 254         res = seq;
 255 #else
 256         struct timeval t;
 257
 258         if (gettimeofday(&t, 0) < 0)
 259         {
 260             yaz_log(YLOG_WARN|YLOG_ERRNO, "gettimeofday");
 261             exit(1);
 262         }
 263         /* at most 256 sessions per second ..
 264            (long long would be more appropriate)*/
 265         res = t.tv_sec;
 266         res = ((res << 8) | (seq & 0xff)) & ((1U << 31) - 1);
 267 #endif
 268     }
 269     return res;
 270 }
 271
 272 static struct http_session *locate_session(struct http_channel *c)
 273 {
 274     struct http_response *rs = c->response;
 275     struct http_request *rq = c->request;
 276     struct http_session *p;
 277     const char *session = http_argbyname(rq, "session");
 278     http_sessions_t http_sessions = c->http_sessions;
 279     unsigned int id;
 280
 281     if (!session)
 282     {
 283         error(rs, PAZPAR2_MISSING_PARAMETER, "session");
 284         return 0;
 285     }
 286     id = atoi(session);
 287     yaz_mutex_enter(http_sessions->mutex);
 288     for (p = http_sessions->session_list; p; p = p->next)
 289         if (id == p->session_id)
 290             break;
 291     if (p)
 292         p->activity_counter++;
 293     yaz_mutex_leave(http_sessions->mutex);
 294     if (p)
 295         iochan_activity(p->timeout_iochan);
 296     else
 297         error(rs, PAZPAR2_NO_SESSION, session);
 298     return p;
 299 }
 300
 301 // Call after use of locate_session, in order to increment the destroy_counter
 302 static void release_session(struct http_channel *c, struct http_session *session) {
 303     http_sessions_t http_sessions = c->http_sessions;
 304     yaz_mutex_enter(http_sessions->mutex);
 305     if (session)
 306         session->destroy_counter++;
 307     yaz_mutex_leave(http_sessions->mutex);
 308 }
 309
 310 // Decode settings parameters and apply to session
 311 // Syntax: setting[target]=value
 312 static int process_settings(struct session *se, struct http_request *rq,
 313                             struct http_response *rs)
 314 {
 315     struct http_argument *a;
 316
 317     for (a = rq->arguments; a; a = a->next)
 318         if (strchr(a->name, '['))
 319         {
 320             char **res;
 321             int num;
 322             char *dbname;
 323             char *setting;
 324
 325             // Nmem_strsplit *rules*!!!
 326             nmem_strsplit(se->session_nmem, "[]", a->name, &res, &num);
 327             if (num != 2)
 328             {
 329                 error(rs, PAZPAR2_MALFORMED_SETTING, a->name);
 330                 return -1;
 331             }
 332             setting = res[0];
 333             dbname = res[1];
 334             session_apply_setting(se, dbname, setting,
 335                     nmem_strdup(se->session_nmem, a->value));
 336         }
 337     return 0;
 338 }
 339
 340 static void cmd_exit(struct http_channel *c)
 341 {
 342     yaz_log(YLOG_WARN, "exit");
 343     http_close_server(c->server);
 344 }
 345
 346 static void cmd_init(struct http_channel *c)
 347 {
 348     char buf[1024];
 349     struct http_request *r = c->request;
 350     const char *clear = http_argbyname(r, "clear");
 351     const char *content_type = http_lookup_header(r->headers, "Content-Type");
 352     unsigned int sesid;
 353     struct http_session *s;
 354     struct http_response *rs = c->response;
 355     struct conf_service *service = 0; /* no service (yet) */
 356
 357     if (r->content_len && content_type &&
 358         !yaz_strcmp_del("text/xml", content_type, "; "))
 359     {
 360         xmlDoc *doc = xmlParseMemory(r->content_buf, r->content_len);
 361         xmlNode *root_n;
 362         if (!doc)
 363         {
 364             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 365             return;
 366         }
 367         root_n = xmlDocGetRootElement(doc);
 368         service = service_create(c->server, root_n);
 369         xmlFreeDoc(doc);
 370         if (!service)
 371         {
 372             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 373             return;
 374         }
 375     }
 376
 377     if (!service)
 378     {
 379         const char *service_name = http_argbyname(c->request, "service");
 380         service = locate_service(c->server, service_name);
 381         if (!service)
 382         {
 383             error(rs, PAZPAR2_NO_SERVICE, service_name ? service_name : "unnamed");
 384             return;
 385         }
 386     }
 387     sesid = make_sessionid();
 388     s = http_session_create(service, c->http_sessions, sesid);
 389
 390     yaz_log(c->http_sessions->log_level, "%p Session init %u ", s, sesid);
 391     if (!clear || *clear == '0')
 392         session_init_databases(s->psession);
 393     else
 394         yaz_log(YLOG_LOG, "HTTP Session %u init: No databases preloaded", sesid);
 395
 396     if (process_settings(s->psession, c->request, c->response) < 0)
 397         return;
 398
 399     sprintf(buf, HTTP_COMMAND_RESPONSE_PREFIX
 400             "<init><status>OK</status><session>%d", sesid);
 401     if (c->server->server_id)
 402     {
 403         strcat(buf, ".");
 404         strcat(buf, c->server->server_id);
 405     }
 406     strcat(buf, "</session>"
 407            "<protocol>" PAZPAR2_PROTOCOL_VERSION "</protocol></init>");
 408     rs->payload = nmem_strdup(c->nmem, buf);
 409     http_send_response(c);
 410 }
 411
 412 static void apply_local_setting(void *client_data,
 413                                 struct setting *set)
 414 {
 415     struct session *se =  (struct session *) client_data;
 416
 417     session_apply_setting(se, nmem_strdup(se->session_nmem, set->target),
 418                           nmem_strdup(se->session_nmem, set->name),
 419                           nmem_strdup(se->session_nmem, set->value));
 420 }
 421
 422 static void cmd_settings(struct http_channel *c)
 423 {
 424     struct http_response *rs = c->response;
 425     struct http_request *rq = c->request;
 426     struct http_session *s = locate_session(c);
 427     const char *content_type = http_lookup_header(rq->headers, "Content-Type");
 428
 429     if (!s)
 430         return;
 431
 432     if (rq->content_len && content_type &&
 433         !yaz_strcmp_del("text/xml", content_type, "; "))
 434     {
 435         xmlDoc *doc = xmlParseMemory(rq->content_buf, rq->content_len);
 436         xmlNode *root_n;
 437         if (!doc)
 438         {
 439             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 440             return;
 441         }
 442         root_n = xmlDocGetRootElement(doc);
 443
 444         settings_read_node_x(root_n, s->psession, apply_local_setting);
 445
 446         xmlFreeDoc(doc);
 447     }
 448     if (process_settings(s->psession, rq, rs) < 0) {
 449         release_session(c,s);
 450         return;
 451     }
 452     rs->payload = HTTP_COMMAND_RESPONSE_PREFIX "<settings><status>OK</status></settings>";
 453     http_send_response(c);
 454     release_session(c,s);
 455 }
 456
 457 // Compares two hitsbytarget nodes by hitcount
 458 static int cmp_ht(const void *p1, const void *p2)
 459 {
 460     const struct hitsbytarget *h1 = p1;
 461     const struct hitsbytarget *h2 = p2;
 462     return h2->hits - h1->hits;
 463 }
 464
 465 // This implements functionality somewhat similar to 'bytarget', but in a termlist form
 466 static int targets_termlist(WRBUF wrbuf, struct session *se, int num,
 467                              NMEM nmem)
 468 {
 469     struct hitsbytarget *ht;
 470     int count, i;
 471
 472     ht = hitsbytarget(se, &count, nmem);
 473     qsort(ht, count, sizeof(struct hitsbytarget), cmp_ht);
 474     for (i = 0; i < count && i < num && ht[i].hits > 0; i++)
 475     {
 476
 477         // do only print terms which have display names
 478
 479         wrbuf_puts(wrbuf, "<term>\n");
 480
 481         wrbuf_puts(wrbuf, "<id>");
 482         wrbuf_xmlputs(wrbuf, ht[i].id);
 483         wrbuf_puts(wrbuf, "</id>\n");
 484
 485         wrbuf_puts(wrbuf, "<name>");
 486         if (!ht[i].name || !ht[i].name[0])
 487             wrbuf_xmlputs(wrbuf, "NO TARGET NAME");
 488         else
 489             wrbuf_xmlputs(wrbuf, ht[i].name);
 490         wrbuf_puts(wrbuf, "</name>\n");
 491
 492         wrbuf_printf(wrbuf, "<frequency>" ODR_INT_PRINTF "</frequency>\n",
 493                      ht[i].hits);
 494
 495         wrbuf_puts(wrbuf, "<state>");
 496         wrbuf_xmlputs(wrbuf, ht[i].state);
 497         wrbuf_puts(wrbuf, "</state>\n");
 498
 499         wrbuf_printf(wrbuf, "<diagnostic>%d</diagnostic>\n",
 500                      ht[i].diagnostic);
 501         wrbuf_puts(wrbuf, "</term>\n");
 502     }
 503     return count;
 504 }
 505
 506 static void cmd_termlist(struct http_channel *c)
 507 {
 508     struct http_response *rs = c->response;
 509     struct http_request *rq = c->request;
 510     struct http_session *s = locate_session(c);
 511     struct termlist_score **p;
 512     int len;
 513     int i;
 514     const char *name = http_argbyname(rq, "name");
 515     const char *nums = http_argbyname(rq, "num");
 516     int num = 15;
 517     int status;
 518     WRBUF debug_log = wrbuf_alloc();
 519
 520     if (!s)
 521         return;
 522
 523     status = session_active_clients(s->psession);
 524
 525     if (!name)
 526         name = "subject";
 527     if (strlen(name) > 255)
 528         return;
 529     if (nums)
 530         num = atoi(nums);
 531
 532     wrbuf_rewind(c->wrbuf);
 533
 534     wrbuf_puts(c->wrbuf, "<termlist>\n");
 535     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", status);
 536     while (*name)
 537     {
 538         char tname[256];
 539         const char *tp;
 540
 541         if (!(tp = strchr(name, ',')))
 542             tp = name + strlen(name);
 543         strncpy(tname, name, tp - name);
 544         tname[tp - name] = '\0';
 545         wrbuf_puts(c->wrbuf, "<list name=\"");
 546         wrbuf_xmlputs(c->wrbuf, tname);
 547         wrbuf_puts(c->wrbuf, "\">\n");
 548         if (!strcmp(tname, "xtargets")) {
 549             int targets = targets_termlist(c->wrbuf, s->psession, num, c->nmem);
 550             wrbuf_printf(debug_log, " xtargets: %d", targets);
 551         }
 552         else
 553         {
 554             p = termlist(s->psession, tname, &len);
 555             if (p && len)
 556                 wrbuf_printf(debug_log, " %s: %d", tname, len);
 557             if (p) {
 558                 for (i = 0; i < len && i < num; i++){
 559                     // prevnt sending empty term elements
 560                     if (!p[i]->term || !p[i]->term[0])
 561                         continue;
 562
 563                     wrbuf_puts(c->wrbuf, "<term>");
 564                     wrbuf_puts(c->wrbuf, "<name>");
 565                     wrbuf_xmlputs(c->wrbuf, p[i]->term);
 566                     wrbuf_puts(c->wrbuf, "</name>");
 567
 568                     wrbuf_printf(c->wrbuf,
 569                                  "<frequency>%d</frequency>",
 570                                  p[i]->frequency);
 571                     wrbuf_puts(c->wrbuf, "</term>\n");
 572                }
 573             }
 574         }
 575         wrbuf_puts(c->wrbuf, "</list>\n");
 576         name = tp;
 577         if (*name == ',')
 578             name++;
 579     }
 580     wrbuf_puts(c->wrbuf, "</termlist>\n");
 581     yaz_log(YLOG_DEBUG, "termlist response: %s ", wrbuf_cstr(debug_log));
 582     wrbuf_destroy(debug_log);
 583     rs->payload = nmem_strdup(rq->channel->nmem, wrbuf_cstr(c->wrbuf));
 584     http_send_response(c);
 585     release_session(c,s);
 586 }
 587
 588 size_t session_get_memory_status(struct session *session);
 589
 590 static void cmd_session_status(struct http_channel *c)
 591 {
 592     struct http_response *rs = c->response;
 593     struct http_session *s = locate_session(c);
 594     size_t session_nmem;
 595     if (!s)
 596         return;
 597
 598     wrbuf_rewind(c->wrbuf);
 599     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<sessionstatus><status>OK</status>\n");
 600     wrbuf_printf(c->wrbuf, "<http_count>%u</http_count>\n", s->activity_counter);
 601     wrbuf_printf(c->wrbuf, "<http_nmem>%zu</http_nmem>\n", nmem_total(s->nmem) );
 602
 603     session_nmem = session_get_memory_status(s->psession);
 604     wrbuf_printf(c->wrbuf, "<session_nmem>%zu</session_nmem>\n", session_nmem);
 605
 606     wrbuf_puts(c->wrbuf, "</sessionstatus>\n");
 607     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 608     http_send_response(c);
 609     release_session(c,s);
 610
 611 }
 612
 613 int sessions_count(void);
 614 int clients_count(void);
 615 int resultsets_count(void);
 616
 617 static void cmd_server_status(struct http_channel *c)
 618 {
 619     struct http_response *rs = c->response;
 620     int sessions   = sessions_count();
 621     int clients    = clients_count();
 622     int resultsets = resultsets_count();
 623     wrbuf_rewind(c->wrbuf);
 624     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<server-status><status>OK</status>\n");
 625     wrbuf_printf(c->wrbuf, "Sessions %u Clients: %u Resultsets: %u\n</server-status>\n", sessions, clients, resultsets);
 626     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 627     http_send_response(c);
 628 }
 629
 630
 631
 632 static void cmd_bytarget(struct http_channel *c)
 633 {
 634     struct http_response *rs = c->response;
 635     struct http_request *rq = c->request;
 636     struct http_session *s = locate_session(c);
 637     struct hitsbytarget *ht;
 638     const char *settings = http_argbyname(rq, "settings");
 639     int count, i;
 640
 641     if (!s)
 642         return;
 643     ht = hitsbytarget(s->psession, &count, c->nmem);
 644     wrbuf_rewind(c->wrbuf);
 645     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<bytarget><status>OK</status>");
 646
 647     for (i = 0; i < count; i++)
 648     {
 649         wrbuf_puts(c->wrbuf, "\n<target>");
 650
 651         wrbuf_puts(c->wrbuf, "<id>");
 652         wrbuf_xmlputs(c->wrbuf, ht[i].id);
 653         wrbuf_puts(c->wrbuf, "</id>\n");
 654
 655         if (ht[i].name && ht[i].name[0])
 656         {
 657             wrbuf_puts(c->wrbuf, "<name>");
 658             wrbuf_xmlputs(c->wrbuf, ht[i].name);
 659             wrbuf_puts(c->wrbuf, "</name>\n");
 660         }
 661
 662         wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", ht[i].hits);
 663         wrbuf_printf(c->wrbuf, "<diagnostic>%d</diagnostic>\n", ht[i].diagnostic);
 664         wrbuf_printf(c->wrbuf, "<records>%d</records>\n", ht[i].records);
 665
 666         wrbuf_puts(c->wrbuf, "<state>");
 667         wrbuf_xmlputs(c->wrbuf, ht[i].state);
 668         wrbuf_puts(c->wrbuf, "</state>\n");
 669         if (settings && *settings == '1')
 670         {
 671             wrbuf_puts(c->wrbuf, "<settings>\n");
 672             wrbuf_puts(c->wrbuf, wrbuf_cstr(ht[i].settings_xml));
 673             wrbuf_puts(c->wrbuf, "</settings>\n");
 674         }
 675         wrbuf_puts(c->wrbuf, "</target>");
 676         wrbuf_destroy(ht[i].settings_xml);
 677     }
 678
 679     wrbuf_puts(c->wrbuf, "</bytarget>");
 680     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 681     http_send_response(c);
 682     release_session(c,s);
 683 }
 684
 685 static void write_metadata(WRBUF w, struct conf_service *service,
 686         struct record_metadata **ml, int full)
 687 {
 688     int imeta;
 689
 690     for (imeta = 0; imeta < service->num_metadata; imeta++)
 691     {
 692         struct conf_metadata *cmd = &service->metadata[imeta];
 693         struct record_metadata *md;
 694         if (!cmd->brief && !full)
 695             continue;
 696         for (md = ml[imeta]; md; md = md->next)
 697         {
 698             struct record_metadata_attr *attr = md->attributes;
 699             wrbuf_printf(w, "\n<md-%s", cmd->name);
 700
 701             for (; attr; attr = attr->next)
 702             {
 703                 wrbuf_printf(w, " %s=\"", attr->name);
 704                 wrbuf_xmlputs(w, attr->value);
 705                 wrbuf_puts(w, "\"");
 706             }
 707             wrbuf_puts(w, ">");
 708             switch (cmd->type)
 709             {
 710                 case Metadata_type_generic:
 711                     wrbuf_xmlputs(w, md->data.text.disp);
 712                     break;
 713                 case Metadata_type_year:
 714                     wrbuf_printf(w, "%d", md->data.number.min);
 715                     if (md->data.number.min != md->data.number.max)
 716                         wrbuf_printf(w, "-%d", md->data.number.max);
 717                     break;
 718                 default:
 719                     wrbuf_puts(w, "[can't represent]");
 720             }
 721             wrbuf_printf(w, "</md-%s>", cmd->name);
 722         }
 723     }
 724 }
 725
 726 static void write_subrecord(struct record *r, WRBUF w,
 727         struct conf_service *service, int show_details)
 728 {
 729     const char *name = session_setting_oneval(
 730         client_get_database(r->client), PZ_NAME);
 731
 732     wrbuf_puts(w, "<location id=\"");
 733     wrbuf_xmlputs(w, client_get_database(r->client)->database->url);
 734     wrbuf_puts(w, "\" ");
 735
 736     wrbuf_puts(w, "name=\"");
 737     wrbuf_xmlputs(w,  *name ? name : "Unknown");
 738     wrbuf_puts(w, "\">");
 739
 740     write_metadata(w, service, r->metadata, show_details);
 741     wrbuf_puts(w, "</location>\n");
 742 }
 743
 744 static void show_raw_record_error(void *data, const char *addinfo)
 745 {
 746     http_channel_observer_t obs = data;
 747     struct http_channel *c = http_channel_observer_chan(obs);
 748     struct http_response *rs = c->response;
 749
 750     http_remove_observer(obs);
 751
 752     error(rs, PAZPAR2_RECORD_FAIL, addinfo);
 753 }
 754
 755 static void show_raw_record_ok(void *data, const char *buf, size_t sz)
 756 {
 757     http_channel_observer_t obs = data;
 758     struct http_channel *c = http_channel_observer_chan(obs);
 759     struct http_response *rs = c->response;
 760
 761     http_remove_observer(obs);
 762
 763     wrbuf_write(c->wrbuf, buf, sz);
 764     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 765     http_send_response(c);
 766 }
 767
 768
 769 static void show_raw_record_ok_binary(void *data, const char *buf, size_t sz)
 770 {
 771     http_channel_observer_t obs = data;
 772     struct http_channel *c = http_channel_observer_chan(obs);
 773     struct http_response *rs = c->response;
 774
 775     http_remove_observer(obs);
 776
 777     wrbuf_write(c->wrbuf, buf, sz);
 778     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 779
 780     rs->content_type = "application/octet-stream";
 781     http_send_response(c);
 782 }
 783
 784
 785 void show_raw_reset(void *data, struct http_channel *c, void *data2)
 786 {
 787     //struct client *client = data;
 788     //client_show_raw_remove(client, data2);
 789 }
 790
 791 static void cmd_record_ready(void *data);
 792
 793 static void cmd_record(struct http_channel *c)
 794 {
 795     struct http_response *rs = c->response;
 796     struct http_request *rq = c->request;
 797     struct http_session *s = locate_session(c);
 798     struct record_cluster *rec, *prev_r, *next_r;
 799     struct record *r;
 800     struct conf_service *service;
 801     const char *idstr = http_argbyname(rq, "id");
 802     const char *offsetstr = http_argbyname(rq, "offset");
 803     const char *binarystr = http_argbyname(rq, "binary");
 804
 805     if (!s)
 806         return;
 807     service = s->psession->service;
 808     if (!idstr)
 809     {
 810         error(rs, PAZPAR2_MISSING_PARAMETER, "id");
 811         return;
 812     }
 813     wrbuf_rewind(c->wrbuf);
 814     if (!(rec = show_single_start(s->psession, idstr, &prev_r, &next_r)))
 815     {
 816         if (session_active_clients(s->psession) == 0)
 817         {
 818             error(rs, PAZPAR2_RECORD_MISSING, idstr);
 819         }
 820         else if (session_set_watch(s->psession, SESSION_WATCH_RECORD,
 821                               cmd_record_ready, c, c) != 0)
 822         {
 823             error(rs, PAZPAR2_RECORD_MISSING, idstr);
 824         }
 825         release_session(c, s);
 826         return;
 827     }
 828     if (offsetstr)
 829     {
 830         int offset = atoi(offsetstr);
 831         const char *syntax = http_argbyname(rq, "syntax");
 832         const char *esn = http_argbyname(rq, "esn");
 833         int i;
 834         struct record*r = rec->records;
 835         int binary = 0;
 836
 837         if (binarystr && *binarystr != '0')
 838             binary = 1;
 839
 840         for (i = 0; i < offset && r; r = r->next, i++)
 841             ;
 842         if (!r)
 843         {
 844             error(rs, PAZPAR2_RECORD_FAIL, "no record at offset given");
 845         }
 846         else
 847         {
 848             http_channel_observer_t obs =
 849                 http_add_observer(c, r->client, show_raw_reset);
 850             int ret = client_show_raw_begin(r->client, r->position,
 851                                         syntax, esn,
 852                                         obs /* data */,
 853                                         show_raw_record_error,
 854                                         (binary ?
 855                                          show_raw_record_ok_binary :
 856                                          show_raw_record_ok),
 857                                         (binary ? 1 : 0));
 858             if (ret == -1)
 859             {
 860                 http_remove_observer(obs);
 861                 error(rs, PAZPAR2_NO_SESSION, 0);
 862             }
 863         }
 864     }
 865     else
 866     {
 867         wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<record>\n");
 868         wrbuf_puts(c->wrbuf, "<recid>");
 869         wrbuf_xmlputs(c->wrbuf, rec->recid);
 870         wrbuf_puts(c->wrbuf, "</recid>\n");
 871         if (prev_r)
 872         {
 873             wrbuf_puts(c->wrbuf, "<prevrecid>");
 874             wrbuf_xmlputs(c->wrbuf, prev_r->recid);
 875             wrbuf_puts(c->wrbuf, "</prevrecid>\n");
 876         }
 877         if (next_r)
 878         {
 879             wrbuf_puts(c->wrbuf, "<nextrecid>");
 880             wrbuf_xmlputs(c->wrbuf, next_r->recid);
 881             wrbuf_puts(c->wrbuf, "</nextrecid>\n");
 882         }
 883         wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n",
 884                      session_active_clients(s->psession));
 885         write_metadata(c->wrbuf, service, rec->metadata, 1);
 886         for (r = rec->records; r; r = r->next)
 887             write_subrecord(r, c->wrbuf, service, 1);
 888         wrbuf_puts(c->wrbuf, "</record>\n");
 889         rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 890         http_send_response(c);
 891     }
 892     show_single_stop(s->psession, rec);
 893     release_session(c, s);
 894 }
 895
 896 static void cmd_record_ready(void *data)
 897 {
 898     struct http_channel *c = (struct http_channel *) data;
 899
 900     cmd_record(c);
 901 }
 902
 903 static void show_records(struct http_channel *c, int active)
 904 {
 905     struct http_request *rq = c->request;
 906     struct http_response *rs = c->response;
 907     struct http_session *s = locate_session(c);
 908     struct record_cluster **rl;
 909     struct reclist_sortparms *sp;
 910     const char *start = http_argbyname(rq, "start");
 911     const char *num = http_argbyname(rq, "num");
 912     const char *sort = http_argbyname(rq, "sort");
 913     int startn = 0;
 914     int numn = 20;
 915     int total;
 916     Odr_int total_hits;
 917     int i;
 918
 919     if (!s)
 920         return;
 921
 922     // We haven't counted clients yet if we're called on a block release
 923     if (active < 0)
 924         active = session_active_clients(s->psession);
 925
 926     if (start)
 927         startn = atoi(start);
 928     if (num)
 929         numn = atoi(num);
 930     if (!sort)
 931         sort = "relevance";
 932     if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
 933     {
 934         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
 935         release_session(c, s);
 936         return;
 937     }
 938
 939
 940     rl = show_range_start(s->psession, sp, startn, &numn, &total, &total_hits);
 941
 942     wrbuf_rewind(c->wrbuf);
 943     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<show>\n<status>OK</status>\n");
 944     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", active);
 945     wrbuf_printf(c->wrbuf, "<merged>%d</merged>\n", total);
 946     wrbuf_printf(c->wrbuf, "<total>" ODR_INT_PRINTF "</total>\n", total_hits);
 947     wrbuf_printf(c->wrbuf, "<start>%d</start>\n", startn);
 948     wrbuf_printf(c->wrbuf, "<num>%d</num>\n", numn);
 949
 950     for (i = 0; i < numn; i++)
 951     {
 952         int ccount;
 953         struct record *p;
 954         struct record_cluster *rec = rl[i];
 955         struct conf_service *service = s->psession->service;
 956
 957         wrbuf_puts(c->wrbuf, "<hit>\n");
 958         write_metadata(c->wrbuf, service, rec->metadata, 0);
 959         for (ccount = 0, p = rl[i]->records; p;  p = p->next, ccount++)
 960             write_subrecord(p, c->wrbuf, service, 0); // subrecs w/o details
 961         if (ccount > 1)
 962             wrbuf_printf(c->wrbuf, "<count>%d</count>\n", ccount);
 963         if (strstr(sort, "relevance"))
 964             wrbuf_printf(c->wrbuf, "<relevance>%d</relevance>\n",
 965                          rec->relevance_score);
 966         wrbuf_puts(c->wrbuf, "<recid>");
 967         wrbuf_xmlputs(c->wrbuf, rec->recid);
 968         wrbuf_puts(c->wrbuf, "</recid>\n");
 969         wrbuf_puts(c->wrbuf, "</hit>\n");
 970     }
 971
 972     show_range_stop(s->psession, rl);
 973
 974     wrbuf_puts(c->wrbuf, "</show>\n");
 975     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 976     http_send_response(c);
 977     release_session(c, s);
 978 }
 979
 980 static void show_records_ready(void *data)
 981 {
 982     struct http_channel *c = (struct http_channel *) data;
 983
 984     show_records(c, -1);
 985 }
 986
 987 static void cmd_show(struct http_channel *c)
 988 {
 989     struct http_request *rq = c->request;
 990     struct http_session *s = locate_session(c);
 991     const char *block = http_argbyname(rq, "block");
 992     int status;
 993
 994     if (!s)
 995         return;
 996
 997     status = session_active_clients(s->psession);
 998
 999     if (block)
1000     {
1001         if (!strcmp(block, "preferred") && !session_is_preferred_clients_ready(s->psession) && reclist_get_num_records(s->psession->reclist) == 0) {
1002             // if there is already a watch/block. we do not block this one
1003             if (session_set_watch(s->psession, SESSION_WATCH_SHOW_PREF,
1004                                   show_records_ready, c, c) != 0)
1005             {
1006                 yaz_log(c->http_sessions->log_level,
1007                         "%p Session %u: Blocking on cmd_show. Waiting for preferred targets", s, s->session_id);
1008             }
1009             release_session(c,s);
1010             return;
1011
1012         }
1013         else if (status && reclist_get_num_records(s->psession->reclist) == 0)
1014         {
1015             // if there is already a watch/block. we do not block this one
1016             if (session_set_watch(s->psession, SESSION_WATCH_SHOW,
1017                                   show_records_ready, c, c) != 0)
1018             {
1019                 yaz_log(c->http_sessions->log_level, "%p Session %u: Blocking on cmd_show", s, s->session_id);
1020             }
1021             release_session(c,s);
1022             return;
1023         }
1024     }
1025     show_records(c, status);
1026     release_session(c,s);
1027 }
1028
1029 static void cmd_ping(struct http_channel *c)
1030 {
1031     struct http_response *rs = c->response;
1032     struct http_session *s = locate_session(c);
1033     if (!s)
1034         return;
1035     rs->payload = HTTP_COMMAND_RESPONSE_PREFIX "<ping><status>OK</status></ping>";
1036     http_send_response(c);
1037     release_session(c, s);
1038 }
1039
1040 static int utf_8_valid(const char *str)
1041 {
1042     yaz_iconv_t cd = yaz_iconv_open("utf-8", "utf-8");
1043     if (cd)
1044     {
1045         /* check that query is UTF-8 encoded */
1046         char *inbuf = (char *) str; /* we know iconv does not alter this */
1047         size_t inbytesleft = strlen(inbuf);
1048
1049         size_t outbytesleft = strlen(inbuf) + 10;
1050         char *out = xmalloc(outbytesleft);
1051         char *outbuf = out;
1052         size_t r = yaz_iconv(cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
1053
1054         /* if OK, try flushing the rest  */
1055         if (r != (size_t) (-1))
1056             r = yaz_iconv(cd, 0, 0, &outbuf, &outbytesleft);
1057         yaz_iconv_close(cd);
1058         xfree(out);
1059         if (r == (size_t) (-1))
1060             return 0;
1061     }
1062     return 1;
1063 }
1064
1065 static void cmd_search(struct http_channel *c)
1066 {
1067     struct http_request *rq = c->request;
1068     struct http_response *rs = c->response;
1069     struct http_session *s = locate_session(c);
1070     const char *query = http_argbyname(rq, "query");
1071     const char *filter = http_argbyname(rq, "filter");
1072     const char *maxrecs = http_argbyname(rq, "maxrecs");
1073     const char *startrecs = http_argbyname(rq, "startrecs");
1074     enum pazpar2_error_code code;
1075     const char *addinfo = 0;
1076
1077     if (!s)
1078         return;
1079     if (!query)
1080     {
1081         error(rs, PAZPAR2_MISSING_PARAMETER, "query");
1082         release_session(c,s);
1083         return;
1084     }
1085     if (!utf_8_valid(query))
1086     {
1087         error(rs, PAZPAR2_MALFORMED_PARAMETER_ENCODING, "query");
1088         release_session(c,s);
1089         return;
1090     }
1091     code = search(s->psession, query, startrecs, maxrecs, filter, &addinfo);
1092     if (code)
1093     {
1094         error(rs, code, addinfo);
1095         release_session(c,s);
1096         return;
1097     }
1098     rs->payload = HTTP_COMMAND_RESPONSE_PREFIX "<search><status>OK</status></search>";
1099     http_send_response(c);
1100     release_session(c,s);
1101 }
1102
1103
1104 static void cmd_stat(struct http_channel *c)
1105 {
1106     struct http_response *rs = c->response;
1107     struct http_session *s = locate_session(c);
1108     struct statistics stat;
1109     int clients;
1110
1111     float progress = 0;
1112
1113     if (!s)
1114         return;
1115
1116     clients = session_active_clients(s->psession);
1117     statistics(s->psession, &stat);
1118
1119     if (stat.num_clients > 0) {
1120         progress = (stat.num_clients  - clients) / (float)stat.num_clients;
1121     }
1122
1123     wrbuf_rewind(c->wrbuf);
1124     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<stat>");
1125     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", clients);
1126     wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", stat.num_hits);
1127     wrbuf_printf(c->wrbuf, "<records>%d</records>\n", stat.num_records);
1128     wrbuf_printf(c->wrbuf, "<clients>%d</clients>\n", stat.num_clients);
1129     wrbuf_printf(c->wrbuf, "<unconnected>%d</unconnected>\n", stat.num_no_connection);
1130     wrbuf_printf(c->wrbuf, "<connecting>%d</connecting>\n", stat.num_connecting);
1131     wrbuf_printf(c->wrbuf, "<working>%d</working>\n", stat.num_working);
1132     wrbuf_printf(c->wrbuf, "<idle>%d</idle>\n", stat.num_idle);
1133     wrbuf_printf(c->wrbuf, "<failed>%d</failed>\n", stat.num_failed);
1134     wrbuf_printf(c->wrbuf, "<error>%d</error>\n", stat.num_error);
1135     wrbuf_printf(c->wrbuf, "<progress>%.2f</progress>\n", progress);
1136     wrbuf_puts(c->wrbuf, "</stat>");
1137     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
1138     http_send_response(c);
1139     release_session(c,s);
1140 }
1141
1142 static void cmd_info(struct http_channel *c)
1143 {
1144     char yaz_version_str[20];
1145     struct http_response *rs = c->response;
1146
1147     wrbuf_rewind(c->wrbuf);
1148     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<info>\n");
1149     wrbuf_puts(c->wrbuf, " <version>\n");
1150     wrbuf_puts(c->wrbuf, "<pazpar2");
1151 #ifdef PAZPAR2_VERSION_SHA1
1152     wrbuf_printf(c->wrbuf, " sha1=\"%s\"", PAZPAR2_VERSION_SHA1);
1153 #endif
1154     wrbuf_puts(c->wrbuf, ">");
1155     wrbuf_xmlputs(c->wrbuf, VERSION);
1156     wrbuf_puts(c->wrbuf, "</pazpar2>");
1157
1158
1159     yaz_version(yaz_version_str, 0);
1160     wrbuf_puts(c->wrbuf, "  <yaz compiled=\"");
1161     wrbuf_xmlputs(c->wrbuf, YAZ_VERSION);
1162     wrbuf_puts(c->wrbuf, "\">");
1163     wrbuf_xmlputs(c->wrbuf, yaz_version_str);
1164     wrbuf_puts(c->wrbuf, "</yaz>\n");
1165
1166     wrbuf_puts(c->wrbuf, " </version>\n");
1167
1168     wrbuf_puts(c->wrbuf, "</info>");
1169     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
1170     http_send_response(c);
1171 }
1172
1173 struct {
1174     char *name;
1175     void (*fun)(struct http_channel *c);
1176 } commands[] = {
1177     { "init", cmd_init },
1178     { "settings", cmd_settings },
1179     { "stat", cmd_stat },
1180     { "bytarget", cmd_bytarget },
1181     { "show", cmd_show },
1182     { "search", cmd_search },
1183     { "termlist", cmd_termlist },
1184     { "exit", cmd_exit },
1185     { "sessionstatus", cmd_session_status },
1186     { "serverstatus", cmd_server_status },
1187     { "ping", cmd_ping },
1188     { "record", cmd_record },
1189     { "info", cmd_info },
1190     {0,0}
1191 };
1192
1193 void http_command(struct http_channel *c)
1194 {
1195     const char *command = http_argbyname(c->request, "command");
1196     struct http_response *rs = http_create_response(c);
1197     int i;
1198
1199     c->response = rs;
1200
1201     http_addheader(rs, "Expires", "Thu, 19 Nov 1981 08:52:00 GMT");
1202     http_addheader(rs, "Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
1203
1204     if (!command)
1205     {
1206         error(rs, PAZPAR2_MISSING_PARAMETER, "command");
1207         return;
1208     }
1209     for (i = 0; commands[i].name; i++)
1210         if (!strcmp(commands[i].name, command))
1211         {
1212             (*commands[i].fun)(c);
1213             break;
1214         }
1215     if (!commands[i].name)
1216         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "command");
1217
1218     return;
1219 }
1220
1221 /*
1222  * Local variables:
1223  * c-basic-offset: 4
1224  * c-file-style: "Stroustrup"
1225  * indent-tabs-mode: nil
1226  * End:
1227  * vim: shiftwidth=4 tabstop=8 expandtab
1228  */
1229