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