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9561b9fb69
When the connection for sink_forward_{oc}_applet fails or a previous one
is destroyed, the sft->appctx is instantly released.
However process_sink_forward_task(), which may run at any time, iterates
over all known sfts and tries to create sessions for orphan ones.
It means that instantly after sft->appctx is destroyed, a new one will
be created, thus a new connection attempt will be made.
It can be an issue with tcp log-servers or sink servers, because if the
server is unavailable, process_sink_forward() will keep looping without
any temporisation until the applet survives (ie: connection succeeds),
which results in unexpected CPU usage on the threads responsible for
that task.
Instead, we add a tempo logic so that a delay of 1second is applied
between two retries. Of course the initial attempt is not delayed.
This could be backported to all stable versions.
83 lines
3.1 KiB
C
83 lines
3.1 KiB
C
/*
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* include/haproxy/sink-t.h
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* This file provides definitions for event sinks
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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_T_H
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#define _HAPROXY_SINK_T_H
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#include <import/ist.h>
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#include <haproxy/api-t.h>
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#include <haproxy/log-t.h>
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/* A sink may be of 4 distinct types :
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* - file descriptor (such as stdout)
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* - ring buffer, readable from CLI
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*/
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enum sink_type {
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SINK_TYPE_FORWARD_DECLARED, // was searched using sink_find_early(), is expected to exist by some component
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SINK_TYPE_NEW, // not yet initialized
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SINK_TYPE_FD, // events sent to a file descriptor
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SINK_TYPE_BUFFER, // events sent to a ring buffer
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};
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struct sink_forward_target {
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struct server *srv; // used server
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struct appctx *appctx; // appctx of current session
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uint last_conn; // copy of now_ms for last session establishment attempt
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size_t ofs; // ring buffer reader offset
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size_t e_processed; // processed events
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struct sink *sink; // the associated sink
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struct sink_forward_target *next;
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__decl_thread(HA_SPINLOCK_T lock); // lock to protect current struct
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};
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/* describes the configuration and current state of an event sink */
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struct sink {
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struct list sink_list; // position in the sink list
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char *name; // sink name
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char *desc; /* sink description:
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* when forward-declared, holds info about where the
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* sink was first forward declared, else holds actual
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* sink description
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*/
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char *store; // backing-store file when buffer
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enum log_fmt fmt; // format expected by the sink
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enum sink_type type; // type of storage
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uint32_t maxlen; // max message length (truncated above)
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struct proxy* forward_px; // internal proxy used to forward (only set when exclusive to sink)
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struct sink_forward_target *sft; // sink forward targets
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struct task *forward_task; // task to handle forward targets conns
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struct sig_handler *forward_sighandler; /* signal handler */
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struct {
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struct ring *ring; // used by ring buffer and STRM sender
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unsigned int dropped; // 2*dropped events since last one + 1 for purge in progress.
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int fd; // fd num for FD type sink
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} ctx;
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};
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#endif /* _HAPROXY_SINK_T_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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