1 /* This file is part of Pazpar2.
2 Copyright (C) Index Data
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
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
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
20 /** \file connection.c
21 \brief Z39.50 connection (low-level client)
42 #include <yaz/comstack.h>
43 #include <yaz/tcpip.h>
44 #include "connection.h"
50 /* connection counting (1) , disable connection counting (0) */
52 static YAZ_MUTEX g_mutex = 0;
53 static int no_connections = 0;
54 static int total_no_connections = 0;
56 static int connection_use(int delta)
60 yaz_mutex_create(&g_mutex);
61 yaz_mutex_enter(g_mutex);
62 no_connections += delta;
63 result = no_connections;
65 total_no_connections += delta;
66 yaz_mutex_leave(g_mutex);
69 yaz_log(YLOG_LOG, "%s connections=%d", delta > 0 ? "INC" : "DEC",
74 int connections_count(void)
76 return connection_use(0);
81 #define connection_use(x)
82 #define connections_count(x) 0
83 #define connections_count_total(x) 0
87 /** \brief Represents a physical, reusable connection to a remote Z39.50 host
93 struct client *client;
101 int operation_timeout;
103 struct connection *next; // next for same host or next in free list
106 static int connection_connect(struct connection *con, iochan_man_t iochan_man);
108 static int connection_is_idle(struct connection *co)
110 ZOOM_connection link = co->link;
113 if (co->state != Conn_Open || !link)
116 if (!ZOOM_connection_is_idle(link))
118 event = ZOOM_connection_peek_event(link);
119 if (event == ZOOM_EVENT_NONE)
125 ZOOM_connection connection_get_link(struct connection *co)
130 static void remove_connection_from_host(struct connection *con)
132 struct connection **conp = &con->host->connections;
138 *conp = (*conp)->next;
141 conp = &(*conp)->next;
143 yaz_cond_broadcast(con->host->cond_ready);
146 // Close connection and recycle structure
147 static void connection_destroy(struct connection *co)
151 ZOOM_connection_destroy(co->link);
152 iochan_destroy(co->iochan);
154 yaz_log(YLOG_DEBUG, "%p Connection destroy %s", co, co->url);
158 client_disconnect(co->client);
167 // Creates a new connection for client, associated with the host of
169 static struct connection *connection_create(struct client *cl,
172 int operation_timeout,
174 iochan_man_t iochan_man)
176 struct connection *co;
178 co = xmalloc(sizeof(*co));
182 co->url = xstrdup(url);
184 client_set_connection(cl, co);
186 co->state = Conn_Closed;
187 co->operation_timeout = operation_timeout;
188 co->session_timeout = session_timeout;
191 connection_connect(co, iochan_man);
193 yaz_mutex_enter(host->mutex);
194 co->next = co->host->connections;
195 co->host->connections = co;
196 yaz_mutex_leave(host->mutex);
202 static void non_block_events(struct connection *co)
205 IOCHAN iochan = co->iochan;
206 ZOOM_connection link = co->link;
209 struct client *cl = co->client;
211 int r = ZOOM_event_nonblock(1, &link);
216 ev = ZOOM_connection_last_event(link);
219 yaz_log(YLOG_DEBUG, "%p Connection ZOOM_EVENT_%s", co, ZOOM_get_event_str(ev));
223 case ZOOM_EVENT_TIMEOUT:
227 const char *error, *addinfo;
229 if ((err = ZOOM_connection_error(link, &error, &addinfo)))
231 struct session *se = client_get_session(cl);
233 session_log(se, YLOG_WARN, "%s: Error %s (%s)",
234 client_get_id(cl), error, addinfo);
235 client_set_diagnostic(cl, err, error, addinfo);
236 client_set_state(cl, Client_Error);
240 iochan_settimeout(iochan, co->session_timeout);
241 client_set_state(cl, Client_Idle);
243 yaz_cond_broadcast(co->host->cond_ready);
246 case ZOOM_EVENT_SEND_DATA:
248 case ZOOM_EVENT_RECV_DATA:
250 case ZOOM_EVENT_UNKNOWN:
252 case ZOOM_EVENT_SEND_APDU:
253 client_set_state(co->client, Client_Working);
254 iochan_settimeout(iochan, co->operation_timeout);
256 case ZOOM_EVENT_RECV_APDU:
258 case ZOOM_EVENT_CONNECT:
259 co->state = Conn_Open;
261 case ZOOM_EVENT_RECV_SEARCH:
262 client_search_response(cl);
264 case ZOOM_EVENT_RECV_RECORD:
265 client_record_response(cl, &got_records);
268 yaz_log(YLOG_LOG, "Unhandled event (%d) from %s",
269 ev, client_get_id(cl));
275 struct client *cl = co->client;
277 client_got_records(cl);
281 void connection_continue(struct connection *co)
283 int r = ZOOM_connection_exec_task(co->link);
286 struct client *cl = co->client;
289 non_block_events(co);
294 iochan_setflags(co->iochan, ZOOM_connection_get_mask(co->link));
295 iochan_setfd(co->iochan, ZOOM_connection_get_socket(co->link));
299 static void connection_handler(IOCHAN iochan, int event)
301 struct connection *co = iochan_getdata(iochan);
303 struct host *host = co->host;
305 yaz_mutex_enter(host->mutex);
309 /* no client associated with it.. We are probably getting
310 a closed connection from the target.. Or, perhaps, an unexpected
311 package.. We will just close the connection */
312 yaz_log(YLOG_LOG, "timeout connection %p event=%d", co, event);
313 remove_connection_from_host(co);
314 yaz_mutex_leave(host->mutex);
315 connection_destroy(co);
317 else if (event & EVENT_TIMEOUT)
319 ZOOM_connection_fire_event_timeout(co->link);
321 non_block_events(co);
324 remove_connection_from_host(co);
325 yaz_mutex_leave(host->mutex);
326 connection_destroy(co);
330 yaz_mutex_leave(host->mutex);
333 non_block_events(co);
335 ZOOM_connection_fire_event_socket(co->link, event);
337 non_block_events(co);
342 iochan_setflags(iochan, ZOOM_connection_get_mask(co->link));
343 iochan_setfd(iochan, ZOOM_connection_get_socket(co->link));
349 // Disassociate connection from client
350 static void connection_release(struct connection *co)
352 struct client *cl = co->client;
356 client_set_connection(cl, 0);
360 void connection_release2(struct connection *co)
365 void connect_resolver_host(struct host *host, iochan_man_t iochan_man)
367 struct connection *con;
369 yaz_mutex_enter(host->mutex);
370 con = host->connections;
373 if (con->state == Conn_Closed)
375 struct client *cl = con->client;
376 if (!host->ipport || !cl) /* unresolved or no client */
378 remove_connection_from_host(con);
379 yaz_mutex_leave(host->mutex);
380 connection_destroy(con);
384 struct session_database *sdb = client_get_database(cl);
385 struct session *se = client_get_session(cl);
388 yaz_mutex_leave(host->mutex);
389 client_start_search(cl);
393 remove_connection_from_host(con);
394 yaz_mutex_leave(host->mutex);
395 connection_destroy(con);
398 /* start all over .. at some point it will be NULL */
399 yaz_mutex_enter(host->mutex);
400 con = host->connections;
407 yaz_mutex_leave(host->mutex);
410 static struct host *connection_get_host(struct connection *con)
415 static int connection_connect(struct connection *con, iochan_man_t iochan_man)
417 struct host *host = connection_get_host(con);
418 ZOOM_options zoptions = ZOOM_options_create();
422 const char *sru_version = 0;
426 struct session_database *sdb = client_get_database(con->client);
427 const char *apdulog = session_setting_oneval(sdb, PZ_APDULOG);
428 const char *memcached = session_setting_oneval(sdb, PZ_MEMCACHED);
429 const char *redis = session_setting_oneval(sdb, PZ_REDIS);
433 ZOOM_options_set(zoptions, "async", "1");
434 ZOOM_options_set(zoptions, "implementationName", PACKAGE_NAME);
435 ZOOM_options_set(zoptions, "implementationVersion", VERSION);
437 if ((charset = session_setting_oneval(sdb, PZ_NEGOTIATION_CHARSET)))
438 ZOOM_options_set(zoptions, "charset", charset);
439 if (memcached && *memcached)
440 ZOOM_options_set(zoptions, "memcached", memcached);
442 ZOOM_options_set(zoptions, "redis", redis);
444 assert(host->ipport);
447 yaz_log(YLOG_LOG, "proxy=%s", host->ipport);
448 ZOOM_options_set(zoptions, "proxy", host->ipport);
452 assert(host->tproxy);
453 yaz_log(YLOG_LOG, "tproxy=%s", host->ipport);
454 ZOOM_options_set(zoptions, "tproxy", host->ipport);
457 if (apdulog && *apdulog)
458 ZOOM_options_set(zoptions, "apdulog", apdulog);
461 if ((sru = session_setting_oneval(sdb, PZ_SRU)) && *sru)
462 ZOOM_options_set(zoptions, "sru", sru);
463 if ((sru_version = session_setting_oneval(sdb, PZ_SRU_VERSION))
465 ZOOM_options_set(zoptions, "sru_version", sru_version);
467 if ((auth = session_setting_oneval(sdb, PZ_AUTHENTICATION)))
469 /* allow splitting user and reset with a blank always */
470 const char *cp1 = strchr(auth, ' ');
471 if (!cp1 && sru && *sru)
472 cp1 = strchr(auth, '/');
475 /* Z39.50 user/password style, or no password for SRU */
476 ZOOM_options_set(zoptions, "user", auth);
480 /* now consider group as well */
481 const char *cp2 = strchr(cp1 + 1, ' ');
483 ZOOM_options_setl(zoptions, "user", auth, cp1 - auth);
485 ZOOM_options_set(zoptions, "password", cp1 + 1);
488 ZOOM_options_setl(zoptions, "group", cp1 + 1, cp2 - cp1 - 1);
489 ZOOM_options_set(zoptions, "password", cp2 + 1);
494 value = session_setting_oneval(sdb, PZ_AUTHENTICATION_MODE);
496 ZOOM_options_set(zoptions, "authenticationMode", value);
498 if (!(con->link = ZOOM_connection_create(zoptions)))
500 yaz_log(YLOG_FATAL|YLOG_ERRNO, "Failed to create ZOOM Connection");
501 ZOOM_options_destroy(zoptions);
506 if (sru && *sru && !strstr(con->url, "://"))
507 wrbuf_puts(w, "http://");
508 if (strchr(con->url, '#'))
510 const char *cp = strchr(con->url, '#');
511 wrbuf_write(w, con->url, cp - con->url);
514 wrbuf_puts(w, con->url);
516 ZOOM_connection_connect(con->link, wrbuf_cstr(w), 0);
518 con->iochan = iochan_create(-1, connection_handler, 0, "connection_socket");
519 con->state = Conn_Connecting;
520 iochan_settimeout(con->iochan, con->operation_timeout);
521 iochan_setdata(con->iochan, con);
522 iochan_add(iochan_man, con->iochan);
524 client_set_state(con->client, Client_Connecting);
525 ZOOM_options_destroy(zoptions);
530 // Ensure that client has a connection associated
531 int client_prep_connection(struct client *cl,
532 int operation_timeout, int session_timeout,
533 iochan_man_t iochan_man,
534 const struct timeval *abstime)
536 struct connection *co;
537 struct session_database *sdb = client_get_database(cl);
538 const char *zproxy = session_setting_oneval(sdb, PZ_ZPROXY);
539 const char *url = session_setting_oneval(sdb, PZ_URL);
540 const char *sru = session_setting_oneval(sdb, PZ_SRU);
541 struct host *host = 0;
542 int default_port = *sru ? 80 : 210;
544 if (zproxy && zproxy[0] == '\0')
548 url = sdb->database->id;
550 host = find_host(client_get_session(cl)->service->server->database_hosts,
551 url, zproxy, default_port, iochan_man);
553 yaz_log(YLOG_DEBUG, "client_prep_connection: target=%s url=%s",
554 client_get_id(cl), url);
558 co = client_get_connection(cl);
562 if (co->host == host && client_get_state(cl) == Client_Idle)
566 connection_release(co);
571 int max_connections = 0;
572 int reuse_connections = 1;
573 const char *v = session_setting_oneval(client_get_database(cl),
576 max_connections = atoi(v);
578 v = session_setting_oneval(client_get_database(cl),
579 PZ_REUSE_CONNECTIONS);
581 reuse_connections = atoi(v);
583 // See if someone else has an idle connection
584 // We should look at timestamps here to select the longest-idle connection
585 yaz_mutex_enter(host->mutex);
588 int num_connections = 0;
589 for (co = host->connections; co; co = co->next)
591 if (reuse_connections)
593 for (co = host->connections; co; co = co->next)
595 if (connection_is_idle(co) &&
596 !strcmp(url, co->url) &&
597 (!co->client || client_get_state(co->client) == Client_Idle) &&
598 !strcmp(ZOOM_connection_option_get(co->link, "user"),
599 session_setting_oneval(client_get_database(cl),
602 if (zproxy == 0 && co->zproxy == 0)
604 if (zproxy && co->zproxy && !strcmp(zproxy, co->zproxy))
610 yaz_log(YLOG_LOG, "num_connections = %d (reusing)", num_connections);
614 if (max_connections <= 0 || num_connections < max_connections)
616 yaz_log(YLOG_LOG, "num_connections = %d (new); max = %d",
617 num_connections, max_connections);
620 yaz_log(YLOG_LOG, "num_connections = %d (waiting) max = %d",
621 num_connections, max_connections);
622 if (yaz_cond_wait(host->cond_ready, host->mutex, abstime))
624 yaz_log(YLOG_LOG, "out of connections %s", client_get_id(cl));
625 client_set_state(cl, Client_Error);
626 yaz_mutex_leave(host->mutex);
632 yaz_log(YLOG_LOG, "%p Connection reuse. state: %d", co, co->state);
633 connection_release(co);
634 client_set_connection(cl, co);
636 /* ensure that connection is only assigned to this client
637 by marking the client non Idle */
638 client_set_state(cl, Client_Working);
639 yaz_mutex_leave(host->mutex);
640 co->operation_timeout = operation_timeout;
641 co->session_timeout = session_timeout;
642 /* tells ZOOM to reconnect if necessary. Disabled becuase
643 the ZOOM_connection_connect flushes the task queue */
644 ZOOM_connection_connect(co->link, 0, 0);
648 yaz_mutex_leave(host->mutex);
649 co = connection_create(cl, url, host,
650 operation_timeout, session_timeout,
665 * c-file-style: "Stroustrup"
666 * indent-tabs-mode: nil
668 * vim: shiftwidth=4 tabstop=8 expandtab