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https://github.com/haproxy/haproxy.git
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5b4c2b58fe
The lbprm structure has moved to backend.h, where it should be, and all algo-specific types and declarations have moved to their specific files. The proxy struct is now much more readable.
92 lines
4.1 KiB
C
92 lines
4.1 KiB
C
/*
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* include/types/backend.h
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* This file assembles definitions for backends
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*
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* Copyright (C) 2000-2009 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 _TYPES_BACKEND_H
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#define _TYPES_BACKEND_H
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#include <common/config.h>
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#include <types/lb_fwlc.h>
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#include <types/lb_fwrr.h>
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#include <types/lb_map.h>
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#include <types/server.h>
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/* Parameters for 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 leastconn mode (dynamic) */
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#define BE_LB_ALGO_HH (BE_LB_PROP_L7 | 0x06) /* balance on Http Header value */
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#define BE_LB_ALGO_RCH (BE_LB_PROP_L4 | 0x07) /* balance on RDP Cookie value */
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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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/* LB parameters for all algorithms */
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struct lbprm {
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int algo; /* load balancing algorithm and variants: BE_LB_ALGO_* */
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int tot_wact, tot_wbck; /* total effective weights of active and backup servers */
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int tot_weight; /* total effective weight of servers participating to LB */
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int tot_used; /* total number of servers used for LB */
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int wmult; /* ratio between user weight and effective weight */
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int wdiv; /* ratio between effective weight and user weight */
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struct server *fbck; /* first backup server when !PR_O_USE_ALL_BK, or NULL */
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struct lb_map map; /* LB parameters for map-based algorithms */
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struct lb_fwrr fwrr;
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struct lb_fwlc fwlc;
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/* Call backs for some actions. Some may be NULL (thus should be ignored). */
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void (*update_server_eweight)(struct server *); /* to be called after eweight change */
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void (*set_server_status_up)(struct server *); /* to be called after status changes to UP */
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void (*set_server_status_down)(struct server *); /* to be called after status changes to DOWN */
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void (*server_take_conn)(struct server *); /* to be called when connection is assigned */
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void (*server_drop_conn)(struct server *); /* to be called when connection is dropped */
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};
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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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