/* This file is part of Pazpar2.
- Copyright (C) 2006-2010 Index Data
+ Copyright (C) 2006-2011 Index Data
Pazpar2 is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
#include <yaz/comstack.h>
#include <yaz/tcpip.h>
#include "connection.h"
-#include "pazpar2.h"
+#include "session.h"
#include "host.h"
#include "client.h"
#include "settings.h"
+/* connection counting (1) , disable connection counting (0) */
+#if 0
+static YAZ_MUTEX g_mutex = 0;
+static int no_connections = 0;
+
+static void connection_use(int delta)
+{
+ if (!g_mutex)
+ yaz_mutex_create(&g_mutex);
+ yaz_mutex_enter(g_mutex);
+ no_connections += delta;
+ yaz_mutex_leave(g_mutex);
+ yaz_log(YLOG_LOG, "%s connections=%d", delta > 0 ? "INC" : "DEC",
+ no_connections);
+}
+#else
+#define connection_use(x)
+#endif
+
/** \brief Represents a physical, reusable connection to a remote Z39.50 host
*/
enum {
Conn_Resolving,
Conn_Connecting,
- Conn_Open
+ Conn_Open,
+ Conn_Dead
} state;
int operation_timeout;
int session_timeout;
if (!ZOOM_connection_is_idle(link))
return 0;
event = ZOOM_connection_peek_event(link);
- if (event == ZOOM_EVENT_NONE || event == ZOOM_EVENT_END)
+ if (event == ZOOM_EVENT_NONE)
return 1;
else
return 0;
{
struct connection **conp = &con->host->connections;
assert(con);
- yaz_mutex_enter(con->host->mutex);
while (*conp)
{
if (*conp == con)
}
conp = &(*conp)->next;
}
- yaz_mutex_leave(con->host->mutex);
+ yaz_cond_broadcast(con->host->cond_ready);
}
// Close connection and recycle structure
-void connection_destroy(struct connection *co)
+static void connection_destroy(struct connection *co)
{
if (co->link)
{
ZOOM_connection_destroy(co->link);
iochan_destroy(co->iochan);
}
- yaz_log(YLOG_DEBUG, "Connection destroy %s", co->host->hostport);
+ yaz_log(YLOG_DEBUG, "%p Connection destroy %s", co, co->host->hostport);
- remove_connection_from_host(co);
if (co->client)
{
client_disconnect(co->client);
}
+
xfree(co->zproxy);
xfree(co);
+ connection_use(-1);
}
// Creates a new connection for client, associated with the host of
int session_timeout,
iochan_man_t iochan_man)
{
- struct connection *new;
+ struct connection *co;
struct host *host = client_get_host(cl);
- new = xmalloc(sizeof(*new));
- new->host = host;
+ co = xmalloc(sizeof(*co));
+ co->host = host;
+
+ co->client = cl;
+ co->zproxy = 0;
+ client_set_connection(cl, co);
+ co->link = 0;
+ co->state = Conn_Resolving;
+ co->operation_timeout = operation_timeout;
+ co->session_timeout = session_timeout;
+ if (host->ipport)
+ connection_connect(co, iochan_man);
yaz_mutex_enter(host->mutex);
- new->next = new->host->connections;
- new->host->connections = new;
+ co->next = co->host->connections;
+ co->host->connections = co;
yaz_mutex_leave(host->mutex);
- new->client = cl;
- new->zproxy = 0;
- client_set_connection(cl, new);
- new->link = 0;
- new->state = Conn_Resolving;
- new->operation_timeout = operation_timeout;
- new->session_timeout = session_timeout;
- if (host->ipport)
- connection_connect(new, iochan_man);
- return new;
+ connection_use(1);
+ return co;
}
static void non_block_events(struct connection *co)
{
- struct client *cl = co->client;
+ int got_records = 0;
IOCHAN iochan = co->iochan;
ZOOM_connection link = co->link;
while (1)
{
+ struct client *cl = co->client;
int ev;
int r = ZOOM_event_nonblock(1, &link);
if (!r)
break;
+ if (!cl)
+ continue;
ev = ZOOM_connection_last_event(link);
-#if 0
- yaz_log(YLOG_LOG, "ZOOM_EVENT_%s", ZOOM_get_event_str(ev));
+
+#if 1
+ yaz_log(YLOG_DEBUG, "%p Connection ZOOM_EVENT_%s", co, ZOOM_get_event_str(ev));
#endif
switch (ev)
{
case ZOOM_EVENT_END:
{
const char *error, *addinfo;
- int err;
+ int err;
if ((err = ZOOM_connection_error(link, &error, &addinfo)))
{
yaz_log(YLOG_LOG, "Error %s from %s",
error, client_get_url(cl));
+ client_set_diagnostic(cl, err);
+ client_set_state(cl, Client_Error);
+ }
+ else
+ {
+ iochan_settimeout(iochan, co->session_timeout);
+ client_set_state(cl, Client_Idle);
}
- iochan_settimeout(iochan, co->session_timeout);
- client_set_diagnostic(cl, err);
- client_set_state(cl, Client_Idle);
+ yaz_cond_broadcast(co->host->cond_ready);
}
break;
case ZOOM_EVENT_SEND_DATA:
break;
case ZOOM_EVENT_RECV_RECORD:
client_record_response(cl);
+ got_records = 1;
break;
default:
yaz_log(YLOG_LOG, "Unhandled event (%d) from %s",
ev, client_get_url(cl));
}
}
+ if (got_records)
+ {
+ struct client *cl = co->client;
+ if (cl)
+ {
+ client_check_preferred_watch(cl);
+ client_got_records(cl);
+ }
+ }
}
void connection_continue(struct connection *co)
{
- non_block_events(co);
+ int r = ZOOM_connection_exec_task(co->link);
+ if (!r)
+ yaz_log(YLOG_WARN, "No task was executed for connection");
+ iochan_setflags(co->iochan, ZOOM_connection_get_mask(co->link));
+ iochan_setfd(co->iochan, ZOOM_connection_get_socket(co->link));
}
static void connection_handler(IOCHAN iochan, int event)
{
struct connection *co = iochan_getdata(iochan);
- struct client *cl = co->client;
- struct session *se = 0;
+ struct client *cl;
+ struct host *host = co->host;
- if (cl)
- se = client_get_session(cl);
- else
+ yaz_mutex_enter(host->mutex);
+ cl = co->client;
+ if (!cl)
{
+ /* no client associated with it.. We are probably getting
+ a closed connection from the target.. Or, perhaps, an unexpected
+ package.. We will just close the connection */
+ yaz_log(YLOG_LOG, "timeout connection %p event=%d", co, event);
+ remove_connection_from_host(co);
+ yaz_mutex_leave(host->mutex);
connection_destroy(co);
- return;
}
-
- if (event & EVENT_TIMEOUT)
+ else if (event & EVENT_TIMEOUT)
{
if (co->state == Conn_Connecting)
{
- yaz_log(YLOG_WARN, "connect timeout %s", client_get_url(cl));
- client_fatal(cl);
+ yaz_log(YLOG_WARN, "%p connect timeout %s", co, client_get_url(cl));
+
+ client_set_state(cl, Client_Error);
+ remove_connection_from_host(co);
+ yaz_mutex_leave(host->mutex);
+ connection_destroy(co);
}
else
{
- yaz_log(YLOG_LOG, "idle timeout %s", client_get_url(cl));
+ yaz_log(YLOG_LOG, "%p Connection idle timeout %s", co, client_get_url(cl));
+ remove_connection_from_host(co);
+ yaz_mutex_leave(host->mutex);
connection_destroy(co);
}
}
else
{
+ yaz_mutex_leave(host->mutex);
+
+ client_lock(cl);
non_block_events(co);
ZOOM_connection_fire_event_socket(co->link, event);
non_block_events(co);
+ client_unlock(cl);
+
+ if (co->link)
+ {
+ iochan_setflags(iochan, ZOOM_connection_get_mask(co->link));
+ iochan_setfd(iochan, ZOOM_connection_get_socket(co->link));
+ }
}
}
// Disassociate connection from client
-void connection_release(struct connection *co)
+static void connection_release(struct connection *co)
{
struct client *cl = co->client;
- yaz_log(YLOG_DEBUG, "Connection release %s", co->host->hostport);
if (!cl)
return;
client_set_connection(cl, 0);
{
struct connection *con;
+start:
yaz_mutex_enter(host->mutex);
con = host->connections;
while (con)
{
if (!host->ipport) /* unresolved */
{
+ remove_connection_from_host(con);
yaz_mutex_leave(host->mutex);
connection_destroy(con);
+ goto start;
/* start all over .. at some point it will be NULL */
- con = host->connections;
}
else if (!con->client)
{
+ remove_connection_from_host(con);
yaz_mutex_leave(host->mutex);
connection_destroy(con);
/* start all over .. at some point it will be NULL */
- con = host->connections;
+ goto start;
}
else
{
yaz_mutex_leave(host->mutex);
connection_connect(con, iochan_man);
client_start_search(con->client);
- con = host->connections;
+ goto start;
}
}
else
return con->host;
}
-// Callback for use by event loop
-// We do this because ZOOM connections don't always have (the same) sockets
-static int socketfun(IOCHAN c)
-{
- struct connection *co = iochan_getdata(c);
- if (!co->link)
- return -1;
- return ZOOM_connection_get_socket(co->link);
-}
-
-// Because ZOOM always knows what events it is interested in; we may not
-static int maskfun(IOCHAN c)
-{
- struct connection *co = iochan_getdata(c);
- if (!co->link)
- return 0;
-
- // This is cheating a little, and assuming that eventl mask IDs are always
- // the same as ZOOM-C's.
- return ZOOM_connection_get_mask(co->link);
-}
-
static int connection_connect(struct connection *con, iochan_man_t iochan_man)
{
ZOOM_connection link = 0;
strcat(http_hostport, host->hostport);
ZOOM_connection_connect(link, http_hostport, 0);
}
+ else if (zproxy && *zproxy)
+ ZOOM_connection_connect(link, host->hostport, 0);
else
ZOOM_connection_connect(link, host->ipport, 0);
con->link = link;
- con->iochan = iochan_create(0, connection_handler, 0);
+ con->iochan = iochan_create(-1, connection_handler, 0, "connection_socket");
con->state = Conn_Connecting;
iochan_settimeout(con->iochan, con->operation_timeout);
iochan_setdata(con->iochan, con);
- iochan_setsocketfun(con->iochan, socketfun);
- iochan_setmaskfun(con->iochan, maskfun);
iochan_add(iochan_man, con->iochan);
/* this fragment is bad DRY: from client_prep_connection */
return 0;
}
-const char *connection_get_url(struct connection *co)
-{
- return client_get_url(co->client);
-}
-
// Ensure that client has a connection associated
int client_prep_connection(struct client *cl,
int operation_timeout, int session_timeout,
- iochan_man_t iochan_man)
+ iochan_man_t iochan_man,
+ const struct timeval *abstime)
{
struct connection *co;
- struct session *se = client_get_session(cl);
struct host *host = client_get_host(cl);
struct session_database *sdb = client_get_database(cl);
const char *zproxy = session_setting_oneval(sdb, PZ_ZPROXY);
if (!co)
{
+ int max_connections = 0;
+ int reuse_connections = 1;
+ const char *v = session_setting_oneval(client_get_database(cl),
+ PZ_MAX_CONNECTIONS);
+ if (v && *v)
+ max_connections = atoi(v);
+
+ v = session_setting_oneval(client_get_database(cl),
+ PZ_REUSE_CONNECTIONS);
+ if (v && *v)
+ reuse_connections = atoi(v);
+
// See if someone else has an idle connection
// We should look at timestamps here to select the longest-idle connection
yaz_mutex_enter(host->mutex);
- for (co = host->connections; co; co = co->next)
- if (connection_is_idle(co) &&
- (!co->client || client_get_session(co->client) != se) &&
- !strcmp(ZOOM_connection_option_get(co->link, "user"),
- session_setting_oneval(client_get_database(cl),
- PZ_AUTHENTICATION)))
- {
- if (zproxy == 0 && co->zproxy == 0)
- break;
- if (zproxy && co->zproxy && !strcmp(zproxy, co->zproxy))
+ while (1)
+ {
+ int num_connections = 0;
+ for (co = host->connections; co; co = co->next)
+ num_connections++;
+ if (reuse_connections) {
+ for (co = host->connections; co; co = co->next)
+ {
+ if (connection_is_idle(co) &&
+ (!co->client || client_get_state(co->client) == Client_Idle) &&
+ !strcmp(ZOOM_connection_option_get(co->link, "user"),
+ session_setting_oneval(client_get_database(cl),
+ PZ_AUTHENTICATION)))
+ {
+ if (zproxy == 0 && co->zproxy == 0)
+ break;
+ if (zproxy && co->zproxy && !strcmp(zproxy, co->zproxy))
+ break;
+ }
+ }
+ if (co)
+ {
+ yaz_log(YLOG_LOG, "num_connections = %d (reusing)", num_connections);
break;
+ }
+ }
+ if (max_connections <= 0 || num_connections < max_connections)
+ {
+ yaz_log(YLOG_LOG, "num_connections = %d (new); max = %d",
+ num_connections, max_connections);
+ break;
}
+ yaz_log(YLOG_LOG, "num_connections = %d (waiting) max = %d",
+ num_connections, max_connections);
+ if (yaz_cond_wait(host->cond_ready, host->mutex, abstime))
+ {
+ yaz_log(YLOG_LOG, "out of connections %s", client_get_url(cl));
+ client_set_state(cl, Client_Error);
+ yaz_mutex_leave(host->mutex);
+ return 0;
+ }
+ }
if (co)
{
+ yaz_log(YLOG_LOG, "%p Connection reuse. state: %d", co, co->state);
connection_release(co);
client_set_connection(cl, co);
co->client = cl;
+ /* ensure that connection is only assigned to this client
+ by marking the client non Idle */
+ client_set_state(cl, Client_Working);
yaz_mutex_leave(host->mutex);
co->operation_timeout = operation_timeout;
co->session_timeout = session_timeout;
projects / pazpar2-moved-to-github.git / blobdiff