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/*
* include/haproxy/sink.h
* This file provides declarations for event sinks management
*
* Copyright (C) 2000-2019 Willy Tarreau - w@1wt.eu
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, version 2.1
* exclusively.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _HAPROXY_SINK_H
#define _HAPROXY_SINK_H
#include <sys/types.h>
#include <haproxy/sink-t.h>
#include <haproxy/thread.h>
extern struct list sink_list;
extern struct proxy *sink_proxies_list;
struct sink *sink_find(const char *name);
struct sink *sink_new_fd(const char *name, const char *desc, enum log_fmt, int fd);
ssize_t __sink_write(struct sink *sink, struct log_header hdr, size_t maxlen,
const struct ist msg[], size_t nmsg);
int sink_announce_dropped(struct sink *sink, struct log_header hdr);
/* tries to send <nmsg> message parts from message array <msg> to sink <sink>.
* Formatting according to the sink's preference is done here, unless sink->fmt
* is unspecified, in which case the caller formatting will be used instead.
*
* It will stop writing at <maxlen> instead of sink->maxlen if <maxlen> is
* positive and inferior to sink->maxlen.
*
* Lost messages are accounted for in the sink's counter. If there
* were lost messages, an attempt is first made to indicate it.
* The function returns the number of Bytes effectively sent or announced.
* or <= 0 in other cases.
*/
static inline ssize_t sink_write(struct sink *sink, struct log_header hdr,
size_t maxlen, const struct ist msg[], size_t nmsg)
{
ssize_t sent;
if (unlikely(sink->ctx.dropped > 0)) {
/* We need to take an exclusive lock so that other producers
* don't do the same thing at the same time and above all we
* want to be sure others have finished sending their messages
* so that the dropped event arrives exactly at the right
* position.
*/
HA_RWLOCK_WRLOCK(RING_LOCK, &sink->ctx.lock);
sent = sink_announce_dropped(sink, hdr);
HA_RWLOCK_WRUNLOCK(RING_LOCK, &sink->ctx.lock);
if (!sent) {
/* we failed, we don't try to send our log as if it
* would pass by chance, we'd get disordered events.
*/
goto fail;
}
}
HA_RWLOCK_RDLOCK(RING_LOCK, &sink->ctx.lock);
sent = __sink_write(sink, hdr, maxlen, msg, nmsg);
HA_RWLOCK_RDUNLOCK(RING_LOCK, &sink->ctx.lock);
fail:
if (unlikely(sent <= 0))
HA_ATOMIC_INC(&sink->ctx.dropped);
return sent;
}
struct sink *sink_new_from_srv(struct server *srv, const char *from);
int sink_resolve_logger_buffer(struct logger *logger, char **msg);
#endif /* _HAPROXY_SINK_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/
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