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https://github.com/haproxy/haproxy.git
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1c2ab96be5
This patch extends the "url_param" load balancing method by introducing the "check_post" option. Using this option enables analysis of the beginning of POST requests to search for the specified URL parameter. The patch also fixes a few minor typos in comments that were discovered during code review.
66 lines
2.6 KiB
C
66 lines
2.6 KiB
C
/*
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include/types/backend.h
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This file assembles definitions for backends
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Copyright (C) 2000-2008 Willy Tarreau - w@1wt.eu
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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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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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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 _TYPES_BACKEND_H
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#define _TYPES_BACKEND_H
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#include <common/config.h>
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/* Parameters for proxy->lbprm.algo.
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* The low part of the value is unique for each algo so that applying the mask
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* BE_LB_ALGO returns a unique algorithm.
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* The high part indicates specific properties.
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*/
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/* Masks to extract algorithm properties */
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#define BE_LB_ALGO 0x000007FF /* mask to extract all algorithm flags */
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#define BE_LB_PROP_DYN 0x00000100 /* mask to match dynamic algorithms */
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#define BE_LB_PROP_L4 0x00000200 /* mask to match layer4-based algorithms */
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#define BE_LB_PROP_L7 0x00000400 /* mask to match layer7-based algorithms */
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/* the algorithms themselves */
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#define BE_LB_ALGO_NONE 0x00000000 /* dispatch or transparent mode */
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#define BE_LB_ALGO_RR (BE_LB_PROP_DYN | 0x01) /* fast weighted round-robin mode (dynamic) */
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#define BE_LB_ALGO_SH (BE_LB_PROP_L4 | 0x02) /* balance on source IP hash */
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#define BE_LB_ALGO_UH (BE_LB_PROP_L7 | 0x03) /* balance on URI hash */
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#define BE_LB_ALGO_PH (BE_LB_PROP_L7 | 0x04) /* balance on URL parameter hash */
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#define BE_LB_ALGO_LC (BE_LB_PROP_DYN | 0x05) /* fast weighted round-robin mode (dynamic) */
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/* various constants */
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/* The scale factor between user weight and effective weight allows smooth
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* weight modulation even with small weights (eg: 1). It should not be too high
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* though because it limits the number of servers in FWRR mode in order to
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* prevent any integer overflow. The max number of servers per backend is
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* limited to about 2^32/255^2/scale ~= 66051/scale. A scale of 16 looks like
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* a good value, as it allows more than 4000 servers per backend while leaving
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* modulation steps of about 6% for servers with the lowest weight (1).
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*/
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#define BE_WEIGHT_SCALE 16
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#endif /* _TYPES_BACKEND_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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