src/http_command.c

   1 /* This file is part of Pazpar2.
   2    Copyright (C) 2006-2009 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 "eventl.h"
  37 #include "parameters.h"
  38 #include "pazpar2.h"
  39 #include "http.h"
  40 #include "settings.h"
  41 #include "client.h"
  42
  43 // Update this when the protocol changes
  44 #define PAZPAR2_PROTOCOL_VERSION "1"
  45
  46 #define HTTP_COMMAND_RESPONSE_PREFIX "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
  47
  48 struct http_session {
  49     IOCHAN timeout_iochan;     // NOTE: This is NOT associated with a socket
  50     struct session *psession;
  51     unsigned int session_id;
  52     int timestamp;
  53     NMEM nmem;
  54     struct http_session *next;
  55 };
  56
  57 static struct http_session *session_list = 0; /* thread pr */
  58
  59 void http_session_destroy(struct http_session *s);
  60
  61 static void session_timeout(IOCHAN i, int event)
  62 {
  63     struct http_session *s = iochan_getdata(i);
  64     http_session_destroy(s);
  65 }
  66
  67 struct http_session *http_session_create(struct conf_service *service)
  68 {
  69     NMEM nmem = nmem_create();
  70     struct http_session *r = nmem_malloc(nmem, sizeof(*r));
  71
  72     r->psession = new_session(nmem, service);
  73     r->session_id = 0;
  74     r->timestamp = 0;
  75     r->nmem = nmem;
  76     r->next = session_list;
  77     session_list = r;
  78     r->timeout_iochan = iochan_create(-1, session_timeout, 0);
  79     iochan_setdata(r->timeout_iochan, r);
  80     iochan_settimeout(r->timeout_iochan, service->session_timeout);
  81
  82     pazpar2_add_channel(r->timeout_iochan);
  83     return r;
  84 }
  85
  86 void http_session_destroy(struct http_session *s)
  87 {
  88     struct http_session **p;
  89
  90     for (p = &session_list; *p; p = &(*p)->next)
  91         if (*p == s)
  92         {
  93             *p = (*p)->next;
  94             break;
  95         }
  96     yaz_log(YLOG_LOG, "Destroying session %u", s->session_id);
  97     iochan_destroy(s->timeout_iochan);
  98     destroy_session(s->psession);
  99     nmem_destroy(s->nmem);
 100 }
 101
 102 static const char *get_msg(enum pazpar2_error_code code)
 103 {
 104     struct pazpar2_error_msg {
 105         enum pazpar2_error_code code;
 106         const char *msg;
 107     };
 108     static const struct pazpar2_error_msg ar[] = {
 109         { PAZPAR2_NO_SESSION, "Session does not exist or it has expired"},
 110         { PAZPAR2_MISSING_PARAMETER, "Missing parameter"},
 111         { PAZPAR2_MALFORMED_PARAMETER_VALUE, "Malformed parameter value"},
 112         { PAZPAR2_MALFORMED_PARAMETER_ENCODING, "Malformed parameter encoding"},
 113         { PAZPAR2_MALFORMED_SETTING, "Malformed setting argument"},
 114         { PAZPAR2_HITCOUNTS_FAILED, "Failed to retrieve hitcounts"},
 115         { PAZPAR2_RECORD_MISSING, "Record missing"},
 116         { PAZPAR2_NO_TARGETS, "No targets"},
 117         { PAZPAR2_CONFIG_TARGET, "Target cannot be configured"},
 118         { PAZPAR2_RECORD_FAIL, "Record command failed"},
 119         { PAZPAR2_NOT_IMPLEMENTED, "Not implemented"},
 120         { PAZPAR2_LAST_ERROR, "Last error"},
 121         { 0, 0 }
 122     };
 123     int i = 0;
 124     while (ar[i].msg)
 125     {
 126         if (code == ar[i].code)
 127             return ar[i].msg;
 128         i++;
 129     }
 130     return "No error";
 131 }
 132
 133 static void error(struct http_response *rs,
 134                   enum pazpar2_error_code code,
 135                   const char *addinfo)
 136 {
 137     struct http_channel *c = rs->channel;
 138     WRBUF text = wrbuf_alloc();
 139     const char *http_status = "417";
 140     const char *msg = get_msg(code);
 141
 142     rs->msg = nmem_strdup(c->nmem, msg);
 143     strcpy(rs->code, http_status);
 144
 145     wrbuf_printf(text, HTTP_COMMAND_RESPONSE_PREFIX "<error code=\"%d\" msg=\"%s\">", (int) code,
 146                msg);
 147     if (addinfo)
 148         wrbuf_xmlputs(text, addinfo);
 149     wrbuf_puts(text, "</error>");
 150
 151     yaz_log(YLOG_WARN, "HTTP %s %s%s%s", http_status,
 152             msg, addinfo ? ": " : "" , addinfo ? addinfo : "");
 153     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(text));
 154     wrbuf_destroy(text);
 155     http_send_response(c);
 156 }
 157
 158 unsigned int make_sessionid(void)
 159 {
 160     static int seq = 0; /* thread pr */
 161     unsigned int res;
 162
 163     seq++;
 164     if (global_parameters.debug_mode)
 165         res = seq;
 166     else
 167     {
 168 #ifdef WIN32
 169         res = seq;
 170 #else
 171         struct timeval t;
 172
 173         if (gettimeofday(&t, 0) < 0)
 174         {
 175             yaz_log(YLOG_WARN|YLOG_ERRNO, "gettimeofday");
 176             exit(1);
 177         }
 178         /* at most 256 sessions per second ..
 179            (long long would be more appropriate)*/
 180         res = t.tv_sec;
 181         res = ((res << 8) | (seq & 0xff)) & ((1U << 31) - 1);
 182 #endif
 183     }
 184     return res;
 185 }
 186
 187 static struct http_session *locate_session(struct http_request *rq, struct http_response *rs)
 188 {
 189     struct http_session *p;
 190     const char *session = http_argbyname(rq, "session");
 191     unsigned int id;
 192
 193     if (!session)
 194     {
 195         error(rs, PAZPAR2_MISSING_PARAMETER, "session");
 196         return 0;
 197     }
 198     id = atoi(session);
 199     for (p = session_list; p; p = p->next)
 200         if (id == p->session_id)
 201         {
 202             iochan_activity(p->timeout_iochan);
 203             return p;
 204         }
 205     error(rs, PAZPAR2_NO_SESSION, session);
 206     return 0;
 207 }
 208
 209 // Decode settings parameters and apply to session
 210 // Syntax: setting[target]=value
 211 static int process_settings(struct session *se, struct http_request *rq,
 212                             struct http_response *rs)
 213 {
 214     struct http_argument *a;
 215
 216     for (a = rq->arguments; a; a = a->next)
 217         if (strchr(a->name, '['))
 218         {
 219             char **res;
 220             int num;
 221             char *dbname;
 222             char *setting;
 223
 224             // Nmem_strsplit *rules*!!!
 225             nmem_strsplit(se->session_nmem, "[]", a->name, &res, &num);
 226             if (num != 2)
 227             {
 228                 error(rs, PAZPAR2_MALFORMED_SETTING, a->name);
 229                 return -1;
 230             }
 231             setting = res[0];
 232             dbname = res[1];
 233             session_apply_setting(se, dbname, setting,
 234                     nmem_strdup(se->session_nmem, a->value));
 235         }
 236     return 0;
 237 }
 238
 239 static void cmd_exit(struct http_channel *c)
 240 {
 241     yaz_log(YLOG_WARN, "exit");
 242     http_close_server(c->server);
 243 }
 244
 245 static void cmd_init(struct http_channel *c)
 246 {
 247     char buf[1024];
 248     struct http_request *r = c->request;
 249     const char *clear = http_argbyname(r, "clear");
 250     const char *content_type = http_lookup_header(r->headers, "Content-Type");
 251     unsigned int sesid;
 252     struct http_session *s;
 253     struct http_response *rs = c->response;
 254     struct conf_service *service = 0; /* no service (yet) */
 255
 256     if (r->content_len && content_type &&
 257         !yaz_strcmp_del("text/xml", content_type, "; "))
 258     {
 259         xmlDoc *doc = xmlParseMemory(r->content_buf, r->content_len);
 260         xmlNode *root_n;
 261         if (!doc)
 262         {
 263             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 264             return;
 265         }
 266         root_n = xmlDocGetRootElement(doc);
 267         service = service_create(c->server, root_n);
 268         xmlFreeDoc(doc);
 269         if (!service)
 270         {
 271             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 272             return;
 273         }
 274     }
 275
 276     if (!service)
 277     {
 278         const char *service_name = http_argbyname(c->request, "service");
 279         service = locate_service(c->server, service_name);
 280         if (!service)
 281         {
 282             error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "service");
 283             return;
 284         }
 285         service_incref(service);
 286     }
 287     s = http_session_create(service);
 288
 289     yaz_log(YLOG_DEBUG, "HTTP Session init");
 290     if (!clear || *clear == '0')
 291         session_init_databases(s->psession);
 292     else
 293         yaz_log(YLOG_LOG, "No databases preloaded");
 294
 295     sesid = make_sessionid();
 296     s->session_id = sesid;
 297     if (process_settings(s->psession, c->request, c->response) < 0)
 298         return;
 299     sprintf(buf, HTTP_COMMAND_RESPONSE_PREFIX "<init><status>OK</status><session>%u</session>"
 300             "<protocol>" PAZPAR2_PROTOCOL_VERSION "</protocol></init>", sesid);
 301     rs->payload = nmem_strdup(c->nmem, buf);
 302     http_send_response(c);
 303 }
 304
 305 static void apply_local_setting(void *client_data,
 306                                 struct setting *set)
 307 {
 308     struct session *se =  (struct session *) client_data;
 309
 310     session_apply_setting(se, nmem_strdup(se->session_nmem, set->target),
 311                           nmem_strdup(se->session_nmem, set->name),
 312                           nmem_strdup(se->session_nmem, set->value));
 313 }
 314
 315 static void cmd_settings(struct http_channel *c)
 316 {
 317     struct http_response *rs = c->response;
 318     struct http_request *rq = c->request;
 319     struct http_session *s = locate_session(rq, rs);
 320     const char *content_type = http_lookup_header(rq->headers, "Content-Type");
 321
 322     if (!s)
 323         return;
 324
 325     if (rq->content_len && content_type &&
 326         !yaz_strcmp_del("text/xml", content_type, "; "))
 327     {
 328         xmlDoc *doc = xmlParseMemory(rq->content_buf, rq->content_len);
 329         xmlNode *root_n;
 330         if (!doc)
 331         {
 332             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
 333             return;
 334         }
 335         root_n = xmlDocGetRootElement(doc);
 336
 337         settings_read_node_x(root_n, s->psession, apply_local_setting);
 338
 339         xmlFreeDoc(doc);
 340     }
 341     if (process_settings(s->psession, rq, rs) < 0)
 342         return;
 343     rs->payload = HTTP_COMMAND_RESPONSE_PREFIX "<settings><status>OK</status></settings>";
 344     http_send_response(c);
 345 }
 346
 347 // Compares two hitsbytarget nodes by hitcount
 348 static int cmp_ht(const void *p1, const void *p2)
 349 {
 350     const struct hitsbytarget *h1 = p1;
 351     const struct hitsbytarget *h2 = p2;
 352     return h2->hits - h1->hits;
 353 }
 354
 355 // This implements functionality somewhat similar to 'bytarget', but in a termlist form
 356 static void targets_termlist(WRBUF wrbuf, struct session *se, int num,
 357                              NMEM nmem)
 358 {
 359     struct hitsbytarget *ht;
 360     int count, i;
 361
 362     ht = hitsbytarget(se, &count, nmem);
 363     qsort(ht, count, sizeof(struct hitsbytarget), cmp_ht);
 364     for (i = 0; i < count && i < num && ht[i].hits > 0; i++)
 365     {
 366
 367         // do only print terms which have display names
 368
 369         wrbuf_puts(wrbuf, "<term>\n");
 370
 371         wrbuf_puts(wrbuf, "<id>");
 372         wrbuf_xmlputs(wrbuf, ht[i].id);
 373         wrbuf_puts(wrbuf, "</id>\n");
 374
 375         wrbuf_puts(wrbuf, "<name>");
 376         if (!ht[i].name || !ht[i].name[0])
 377             wrbuf_xmlputs(wrbuf, "NO TARGET NAME");
 378         else
 379             wrbuf_xmlputs(wrbuf, ht[i].name);
 380         wrbuf_puts(wrbuf, "</name>\n");
 381
 382         wrbuf_printf(wrbuf, "<frequency>" ODR_INT_PRINTF "</frequency>\n",
 383                      ht[i].hits);
 384
 385         wrbuf_puts(wrbuf, "<state>");
 386         wrbuf_xmlputs(wrbuf, ht[i].state);
 387         wrbuf_puts(wrbuf, "</state>\n");
 388
 389         wrbuf_printf(wrbuf, "<diagnostic>%d</diagnostic>\n",
 390                      ht[i].diagnostic);
 391         wrbuf_puts(wrbuf, "</term>\n");
 392     }
 393 }
 394
 395 static void cmd_termlist(struct http_channel *c)
 396 {
 397     struct http_response *rs = c->response;
 398     struct http_request *rq = c->request;
 399     struct http_session *s = locate_session(rq, rs);
 400     struct termlist_score **p;
 401     int len;
 402     int i;
 403     const char *name = http_argbyname(rq, "name");
 404     const char *nums = http_argbyname(rq, "num");
 405     int num = 15;
 406     int status;
 407
 408     if (!s)
 409         return;
 410
 411     status = session_active_clients(s->psession);
 412
 413     if (!name)
 414         name = "subject";
 415     if (strlen(name) > 255)
 416         return;
 417     if (nums)
 418         num = atoi(nums);
 419
 420     wrbuf_rewind(c->wrbuf);
 421
 422     wrbuf_puts(c->wrbuf, "<termlist>\n");
 423     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", status);
 424     while (*name)
 425     {
 426         char tname[256];
 427         const char *tp;
 428
 429         if (!(tp = strchr(name, ',')))
 430             tp = name + strlen(name);
 431         strncpy(tname, name, tp - name);
 432         tname[tp - name] = '\0';
 433
 434         wrbuf_puts(c->wrbuf, "<list name=\"");
 435         wrbuf_xmlputs(c->wrbuf, tname);
 436         wrbuf_puts(c->wrbuf, "\">\n");
 437         if (!strcmp(tname, "xtargets"))
 438             targets_termlist(c->wrbuf, s->psession, num, c->nmem);
 439         else
 440         {
 441             p = termlist(s->psession, tname, &len);
 442             if (p)
 443                 for (i = 0; i < len && i < num; i++){
 444                     // prevnt sending empty term elements
 445                     if (!p[i]->term || !p[i]->term[0])
 446                         continue;
 447
 448                     wrbuf_puts(c->wrbuf, "<term>");
 449                     wrbuf_puts(c->wrbuf, "<name>");
 450                     wrbuf_xmlputs(c->wrbuf, p[i]->term);
 451                     wrbuf_puts(c->wrbuf, "</name>");
 452
 453                     wrbuf_printf(c->wrbuf,
 454                                  "<frequency>%d</frequency>",
 455                                  p[i]->frequency);
 456                     wrbuf_puts(c->wrbuf, "</term>\n");
 457                }
 458         }
 459         wrbuf_puts(c->wrbuf, "</list>\n");
 460         name = tp;
 461         if (*name == ',')
 462             name++;
 463     }
 464     wrbuf_puts(c->wrbuf, "</termlist>\n");
 465     rs->payload = nmem_strdup(rq->channel->nmem, wrbuf_cstr(c->wrbuf));
 466     http_send_response(c);
 467 }
 468
 469
 470 static void cmd_bytarget(struct http_channel *c)
 471 {
 472     struct http_response *rs = c->response;
 473     struct http_request *rq = c->request;
 474     struct http_session *s = locate_session(rq, rs);
 475     struct hitsbytarget *ht;
 476     const char *settings = http_argbyname(rq, "settings");
 477     int count, i;
 478
 479     if (!s)
 480         return;
 481     ht = hitsbytarget(s->psession, &count, c->nmem);
 482     wrbuf_rewind(c->wrbuf);
 483     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<bytarget><status>OK</status>");
 484
 485     for (i = 0; i < count; i++)
 486     {
 487         wrbuf_puts(c->wrbuf, "\n<target>");
 488
 489         wrbuf_puts(c->wrbuf, "<id>");
 490         wrbuf_xmlputs(c->wrbuf, ht[i].id);
 491         wrbuf_puts(c->wrbuf, "</id>\n");
 492
 493         if (ht[i].name && ht[i].name[0])
 494         {
 495             wrbuf_puts(c->wrbuf, "<name>");
 496             wrbuf_xmlputs(c->wrbuf, ht[i].name);
 497             wrbuf_puts(c->wrbuf, "</name>\n");
 498         }
 499
 500         wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", ht[i].hits);
 501         wrbuf_printf(c->wrbuf, "<diagnostic>%d</diagnostic>\n", ht[i].diagnostic);
 502         wrbuf_printf(c->wrbuf, "<records>%d</records>\n", ht[i].records);
 503
 504         wrbuf_puts(c->wrbuf, "<state>");
 505         wrbuf_xmlputs(c->wrbuf, ht[i].state);
 506         wrbuf_puts(c->wrbuf, "</state>\n");
 507         if (settings && *settings == '1')
 508         {
 509             wrbuf_puts(c->wrbuf, "<settings>\n");
 510             wrbuf_puts(c->wrbuf, wrbuf_cstr(ht[i].settings_xml));
 511             wrbuf_puts(c->wrbuf, "</settings>\n");
 512         }
 513         wrbuf_puts(c->wrbuf, "</target>");
 514         wrbuf_destroy(ht[i].settings_xml);
 515     }
 516
 517     wrbuf_puts(c->wrbuf, "</bytarget>");
 518     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 519     http_send_response(c);
 520 }
 521
 522 static void write_metadata(WRBUF w, struct conf_service *service,
 523         struct record_metadata **ml, int full)
 524 {
 525     int imeta;
 526
 527     for (imeta = 0; imeta < service->num_metadata; imeta++)
 528     {
 529         struct conf_metadata *cmd = &service->metadata[imeta];
 530         struct record_metadata *md;
 531         if (!cmd->brief && !full)
 532             continue;
 533         for (md = ml[imeta]; md; md = md->next)
 534         {
 535             struct record_metadata_attr *attr = md->attributes;
 536             wrbuf_printf(w, "\n<md-%s", cmd->name);
 537
 538             for (; attr; attr = attr->next)
 539             {
 540                 wrbuf_printf(w, " %s=\"", attr->name);
 541                 wrbuf_xmlputs(w, attr->value);
 542                 wrbuf_puts(w, "\"");
 543             }
 544             wrbuf_puts(w, ">");
 545             switch (cmd->type)
 546             {
 547                 case Metadata_type_generic:
 548                     wrbuf_xmlputs(w, md->data.text.disp);
 549                     break;
 550                 case Metadata_type_year:
 551                     wrbuf_printf(w, "%d", md->data.number.min);
 552                     if (md->data.number.min != md->data.number.max)
 553                         wrbuf_printf(w, "-%d", md->data.number.max);
 554                     break;
 555                 default:
 556                     wrbuf_puts(w, "[can't represent]");
 557             }
 558             wrbuf_printf(w, "</md-%s>", cmd->name);
 559         }
 560     }
 561 }
 562
 563 static void write_subrecord(struct record *r, WRBUF w,
 564         struct conf_service *service, int show_details)
 565 {
 566     const char *name = session_setting_oneval(
 567         client_get_database(r->client), PZ_NAME);
 568
 569     wrbuf_puts(w, "<location id=\"");
 570     wrbuf_xmlputs(w, client_get_database(r->client)->database->url);
 571     wrbuf_puts(w, "\" ");
 572
 573     wrbuf_puts(w, "name=\"");
 574     wrbuf_xmlputs(w,  *name ? name : "Unknown");
 575     wrbuf_puts(w, "\">");
 576
 577     write_metadata(w, service, r->metadata, show_details);
 578     wrbuf_puts(w, "</location>\n");
 579 }
 580
 581 static void show_raw_record_error(void *data, const char *addinfo)
 582 {
 583     http_channel_observer_t obs = data;
 584     struct http_channel *c = http_channel_observer_chan(obs);
 585     struct http_response *rs = c->response;
 586
 587     http_remove_observer(obs);
 588
 589     error(rs, PAZPAR2_RECORD_FAIL, addinfo);
 590 }
 591
 592 static void show_raw_record_ok(void *data, const char *buf, size_t sz)
 593 {
 594     http_channel_observer_t obs = data;
 595     struct http_channel *c = http_channel_observer_chan(obs);
 596     struct http_response *rs = c->response;
 597
 598     http_remove_observer(obs);
 599
 600     wrbuf_write(c->wrbuf, buf, sz);
 601     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 602     http_send_response(c);
 603 }
 604
 605
 606 static void show_raw_record_ok_binary(void *data, const char *buf, size_t sz)
 607 {
 608     http_channel_observer_t obs = data;
 609     struct http_channel *c = http_channel_observer_chan(obs);
 610     struct http_response *rs = c->response;
 611
 612     http_remove_observer(obs);
 613
 614     wrbuf_write(c->wrbuf, buf, sz);
 615     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 616
 617     rs->content_type = "application/octet-stream";
 618     http_send_response(c);
 619 }
 620
 621
 622 void show_raw_reset(void *data, struct http_channel *c, void *data2)
 623 {
 624     //struct client *client = data;
 625     //client_show_raw_remove(client, data2);
 626 }
 627
 628 static void cmd_record_ready(void *data);
 629
 630 static void cmd_record(struct http_channel *c)
 631 {
 632     struct http_response *rs = c->response;
 633     struct http_request *rq = c->request;
 634     struct http_session *s = locate_session(rq, rs);
 635     struct record_cluster *rec, *prev_r, *next_r;
 636     struct record *r;
 637     struct conf_service *service;
 638     const char *idstr = http_argbyname(rq, "id");
 639     const char *offsetstr = http_argbyname(rq, "offset");
 640     const char *binarystr = http_argbyname(rq, "binary");
 641
 642     if (!s)
 643         return;
 644     service = s->psession->service;
 645     if (!idstr)
 646     {
 647         error(rs, PAZPAR2_MISSING_PARAMETER, "id");
 648         return;
 649     }
 650     wrbuf_rewind(c->wrbuf);
 651     if (!(rec = show_single(s->psession, idstr, &prev_r, &next_r)))
 652     {
 653         if (session_active_clients(s->psession) == 0)
 654         {
 655             error(rs, PAZPAR2_RECORD_MISSING, idstr);
 656         }
 657         else if (session_set_watch(s->psession, SESSION_WATCH_RECORD,
 658                               cmd_record_ready, c, c) != 0)
 659         {
 660             error(rs, PAZPAR2_RECORD_MISSING, idstr);
 661         }
 662         return;
 663     }
 664     if (offsetstr)
 665     {
 666         int offset = atoi(offsetstr);
 667         const char *syntax = http_argbyname(rq, "syntax");
 668         const char *esn = http_argbyname(rq, "esn");
 669         int i;
 670         struct record*r = rec->records;
 671         int binary = 0;
 672
 673         if (binarystr && *binarystr != '0')
 674             binary = 1;
 675
 676         for (i = 0; i < offset && r; r = r->next, i++)
 677             ;
 678         if (!r)
 679         {
 680             error(rs, PAZPAR2_RECORD_FAIL, "no record at offset given");
 681             return;
 682         }
 683         else
 684         {
 685             http_channel_observer_t obs =
 686                 http_add_observer(c, r->client, show_raw_reset);
 687             int ret = client_show_raw_begin(r->client, r->position,
 688                                         syntax, esn,
 689                                         obs /* data */,
 690                                         show_raw_record_error,
 691                                         (binary ?
 692                                          show_raw_record_ok_binary :
 693                                          show_raw_record_ok),
 694                                         (binary ? 1 : 0));
 695             if (ret == -1)
 696             {
 697                 http_remove_observer(obs);
 698                 error(rs, PAZPAR2_NO_SESSION, 0);
 699             }
 700         }
 701     }
 702     else
 703     {
 704         wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<record>\n");
 705         wrbuf_puts(c->wrbuf, "<recid>");
 706         wrbuf_xmlputs(c->wrbuf, rec->recid);
 707         wrbuf_puts(c->wrbuf, "</recid>\n");
 708         if (prev_r)
 709         {
 710             wrbuf_puts(c->wrbuf, "<prevrecid>");
 711             wrbuf_xmlputs(c->wrbuf, prev_r->recid);
 712             wrbuf_puts(c->wrbuf, "</prevrecid>\n");
 713         }
 714         if (next_r)
 715         {
 716             wrbuf_puts(c->wrbuf, "<nextrecid>");
 717             wrbuf_xmlputs(c->wrbuf, next_r->recid);
 718             wrbuf_puts(c->wrbuf, "</nextrecid>\n");
 719         }
 720         wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n",
 721                      session_active_clients(s->psession));
 722         write_metadata(c->wrbuf, service, rec->metadata, 1);
 723         for (r = rec->records; r; r = r->next)
 724             write_subrecord(r, c->wrbuf, service, 1);
 725         wrbuf_puts(c->wrbuf, "</record>\n");
 726         rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 727         http_send_response(c);
 728     }
 729 }
 730
 731 static void cmd_record_ready(void *data)
 732 {
 733     struct http_channel *c = (struct http_channel *) data;
 734
 735     cmd_record(c);
 736 }
 737
 738 static void show_records(struct http_channel *c, int active)
 739 {
 740     struct http_request *rq = c->request;
 741     struct http_response *rs = c->response;
 742     struct http_session *s = locate_session(rq, rs);
 743     struct record_cluster **rl;
 744     struct reclist_sortparms *sp;
 745     const char *start = http_argbyname(rq, "start");
 746     const char *num = http_argbyname(rq, "num");
 747     const char *sort = http_argbyname(rq, "sort");
 748     int startn = 0;
 749     int numn = 20;
 750     int total;
 751     Odr_int total_hits;
 752     int i;
 753
 754     if (!s)
 755         return;
 756
 757     // We haven't counted clients yet if we're called on a block release
 758     if (active < 0)
 759         active = session_active_clients(s->psession);
 760
 761     if (start)
 762         startn = atoi(start);
 763     if (num)
 764         numn = atoi(num);
 765     if (!sort)
 766         sort = "relevance";
 767     if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
 768     {
 769         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
 770         return;
 771     }
 772
 773     rl = show(s->psession, sp, startn, &numn, &total, &total_hits, c->nmem);
 774
 775     wrbuf_rewind(c->wrbuf);
 776     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<show>\n<status>OK</status>\n");
 777     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", active);
 778     wrbuf_printf(c->wrbuf, "<merged>%d</merged>\n", total);
 779     wrbuf_printf(c->wrbuf, "<total>" ODR_INT_PRINTF "</total>\n", total_hits);
 780     wrbuf_printf(c->wrbuf, "<start>%d</start>\n", startn);
 781     wrbuf_printf(c->wrbuf, "<num>%d</num>\n", numn);
 782
 783     for (i = 0; i < numn; i++)
 784     {
 785         int ccount;
 786         struct record *p;
 787         struct record_cluster *rec = rl[i];
 788         struct conf_service *service = s->psession->service;
 789
 790         wrbuf_puts(c->wrbuf, "<hit>\n");
 791         write_metadata(c->wrbuf, service, rec->metadata, 0);
 792         for (ccount = 0, p = rl[i]->records; p;  p = p->next, ccount++)
 793             write_subrecord(p, c->wrbuf, service, 0); // subrecs w/o details
 794         if (ccount > 1)
 795             wrbuf_printf(c->wrbuf, "<count>%d</count>\n", ccount);
 796         if (strstr(sort, "relevance"))
 797             wrbuf_printf(c->wrbuf, "<relevance>%d</relevance>\n", rec->relevance);
 798         wrbuf_puts(c->wrbuf, "<recid>");
 799         wrbuf_xmlputs(c->wrbuf, rec->recid);
 800         wrbuf_puts(c->wrbuf, "</recid>\n");
 801         wrbuf_puts(c->wrbuf, "</hit>\n");
 802     }
 803
 804     wrbuf_puts(c->wrbuf, "</show>\n");
 805     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 806     http_send_response(c);
 807 }
 808
 809 static void show_records_ready(void *data)
 810 {
 811     struct http_channel *c = (struct http_channel *) data;
 812
 813     show_records(c, -1);
 814 }
 815
 816 static void cmd_show(struct http_channel *c)
 817 {
 818     struct http_request *rq = c->request;
 819     struct http_response *rs = c->response;
 820     struct http_session *s = locate_session(rq, rs);
 821     const char *block = http_argbyname(rq, "block");
 822     int status;
 823
 824     if (!s)
 825         return;
 826
 827     status = session_active_clients(s->psession);
 828
 829     if (block)
 830     {
 831         if (status && reclist_get_num_records(s->psession->reclist) == 0)
 832         {
 833             // if there is already a watch/block. we do not block this one
 834             if (session_set_watch(s->psession, SESSION_WATCH_SHOW,
 835                                   show_records_ready, c, c) != 0)
 836             {
 837                 yaz_log(YLOG_DEBUG, "Blocking on cmd_show");
 838             }
 839             return;
 840         }
 841     }
 842
 843     show_records(c, status);
 844 }
 845
 846 static void cmd_ping(struct http_channel *c)
 847 {
 848     struct http_request *rq = c->request;
 849     struct http_response *rs = c->response;
 850     struct http_session *s = locate_session(rq, rs);
 851     if (!s)
 852         return;
 853     rs->payload = HTTP_COMMAND_RESPONSE_PREFIX "<ping><status>OK</status></ping>";
 854     http_send_response(c);
 855 }
 856
 857 static int utf_8_valid(const char *str)
 858 {
 859     yaz_iconv_t cd = yaz_iconv_open("utf-8", "utf-8");
 860     if (cd)
 861     {
 862         /* check that query is UTF-8 encoded */
 863         char *inbuf = (char *) str; /* we know iconv does not alter this */
 864         size_t inbytesleft = strlen(inbuf);
 865
 866         size_t outbytesleft = strlen(inbuf) + 10;
 867         char *out = xmalloc(outbytesleft);
 868         char *outbuf = out;
 869         size_t r = yaz_iconv(cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
 870
 871         /* if OK, try flushing the rest  */
 872         if (r != (size_t) (-1))
 873             r = yaz_iconv(cd, 0, 0, &outbuf, &outbytesleft);
 874         yaz_iconv_close(cd);
 875         xfree(out);
 876         if (r == (size_t) (-1))
 877             return 0;
 878     }
 879     return 1;
 880 }
 881
 882 static void cmd_search(struct http_channel *c)
 883 {
 884     struct http_request *rq = c->request;
 885     struct http_response *rs = c->response;
 886     struct http_session *s = locate_session(rq, rs);
 887     const char *query = http_argbyname(rq, "query");
 888     const char *filter = http_argbyname(rq, "filter");
 889     const char *maxrecs = http_argbyname(rq, "maxrecs");
 890     const char *startrecs = http_argbyname(rq, "startrecs");
 891     enum pazpar2_error_code code;
 892     const char *addinfo = 0;
 893
 894     if (!s)
 895         return;
 896     if (!query)
 897     {
 898         error(rs, PAZPAR2_MISSING_PARAMETER, "query");
 899         return;
 900     }
 901     if (!utf_8_valid(query))
 902     {
 903         error(rs, PAZPAR2_MALFORMED_PARAMETER_ENCODING, "query");
 904         return;
 905     }
 906     code = search(s->psession, query, startrecs, maxrecs, filter, &addinfo);
 907     if (code)
 908     {
 909         error(rs, code, addinfo);
 910         return;
 911     }
 912     rs->payload = HTTP_COMMAND_RESPONSE_PREFIX "<search><status>OK</status></search>";
 913     http_send_response(c);
 914 }
 915
 916
 917 static void cmd_stat(struct http_channel *c)
 918 {
 919     struct http_request *rq = c->request;
 920     struct http_response *rs = c->response;
 921     struct http_session *s = locate_session(rq, rs);
 922     struct statistics stat;
 923     int clients;
 924
 925     float progress = 0;
 926
 927     if (!s)
 928         return;
 929
 930     clients = session_active_clients(s->psession);
 931     statistics(s->psession, &stat);
 932
 933     if (stat.num_clients > 0) {
 934         progress = (stat.num_clients  - clients) / (float)stat.num_clients;
 935     }
 936
 937     wrbuf_rewind(c->wrbuf);
 938     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<stat>");
 939     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", clients);
 940     wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", stat.num_hits);
 941     wrbuf_printf(c->wrbuf, "<records>%d</records>\n", stat.num_records);
 942     wrbuf_printf(c->wrbuf, "<clients>%d</clients>\n", stat.num_clients);
 943     wrbuf_printf(c->wrbuf, "<unconnected>%d</unconnected>\n", stat.num_no_connection);
 944     wrbuf_printf(c->wrbuf, "<connecting>%d</connecting>\n", stat.num_connecting);
 945     wrbuf_printf(c->wrbuf, "<working>%d</working>\n", stat.num_working);
 946     wrbuf_printf(c->wrbuf, "<idle>%d</idle>\n", stat.num_idle);
 947     wrbuf_printf(c->wrbuf, "<failed>%d</failed>\n", stat.num_failed);
 948     wrbuf_printf(c->wrbuf, "<error>%d</error>\n", stat.num_error);
 949     wrbuf_printf(c->wrbuf, "<progress>%.2f</progress>\n", progress);
 950     wrbuf_puts(c->wrbuf, "</stat>");
 951     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 952     http_send_response(c);
 953 }
 954
 955 static void cmd_info(struct http_channel *c)
 956 {
 957     char yaz_version_str[20];
 958     struct http_response *rs = c->response;
 959
 960     wrbuf_rewind(c->wrbuf);
 961     wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<info>\n");
 962     wrbuf_puts(c->wrbuf, " <version>\n");
 963     wrbuf_puts(c->wrbuf, "<pazpar2");
 964 #ifdef PAZPAR2_VERSION_SHA1
 965     wrbuf_printf(c->wrbuf, " sha1=\"%s\"", PAZPAR2_VERSION_SHA1);
 966 #endif
 967     wrbuf_puts(c->wrbuf, ">");
 968     wrbuf_xmlputs(c->wrbuf, VERSION);
 969     wrbuf_puts(c->wrbuf, "</pazpar2>");
 970
 971
 972     yaz_version(yaz_version_str, 0);
 973     wrbuf_puts(c->wrbuf, "  <yaz compiled=\"");
 974     wrbuf_xmlputs(c->wrbuf, YAZ_VERSION);
 975     wrbuf_puts(c->wrbuf, "\">");
 976     wrbuf_xmlputs(c->wrbuf, yaz_version_str);
 977     wrbuf_puts(c->wrbuf, "</yaz>\n");
 978
 979     wrbuf_puts(c->wrbuf, " </version>\n");
 980
 981     wrbuf_puts(c->wrbuf, "</info>");
 982     rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
 983     http_send_response(c);
 984 }
 985
 986 struct {
 987     char *name;
 988     void (*fun)(struct http_channel *c);
 989 } commands[] = {
 990     { "init", cmd_init },
 991     { "settings", cmd_settings },
 992     { "stat", cmd_stat },
 993     { "bytarget", cmd_bytarget },
 994     { "show", cmd_show },
 995     { "search", cmd_search },
 996     { "termlist", cmd_termlist },
 997     { "exit", cmd_exit },
 998     { "ping", cmd_ping },
 999     { "record", cmd_record },
1000     { "info", cmd_info },
1001     {0,0}
1002 };
1003
1004 void http_command(struct http_channel *c)
1005 {
1006     const char *command = http_argbyname(c->request, "command");
1007     struct http_response *rs = http_create_response(c);
1008     int i;
1009
1010     c->response = rs;
1011
1012     http_addheader(rs, "Expires", "Thu, 19 Nov 1981 08:52:00 GMT");
1013     http_addheader(rs, "Cache-Control", "no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
1014
1015     if (!command)
1016     {
1017         error(rs, PAZPAR2_MISSING_PARAMETER, "command");
1018         return;
1019     }
1020     for (i = 0; commands[i].name; i++)
1021         if (!strcmp(commands[i].name, command))
1022         {
1023             (*commands[i].fun)(c);
1024             break;
1025         }
1026     if (!commands[i].name)
1027         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "command");
1028
1029     return;
1030 }
1031
1032 /*
1033  * Local variables:
1034  * c-basic-offset: 4
1035  * c-file-style: "Stroustrup"
1036  * indent-tabs-mode: nil
1037  * End:
1038  * vim: shiftwidth=4 tabstop=8 expandtab
1039  */
1040