| | varnish-cache/vmod/vmod_directors_hash.c |
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/*- |
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* Copyright (c) 2013-2015 Varnish Software AS |
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* All rights reserved. |
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* |
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* Author: Poul-Henning Kamp <phk@FreeBSD.org> |
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* |
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* SPDX-License-Identifier: BSD-2-Clause |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include "config.h" |
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#include <stdlib.h> |
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#include <string.h> |
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#include "cache/cache.h" |
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#include "vmod_directors.h" |
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#include "vcc_directors_if.h" |
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struct vmod_directors_hash { |
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unsigned magic; |
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#define VMOD_DIRECTORS_HASH_MAGIC 0xc08dd611 |
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struct vdir *vd; |
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}; |
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static void v_matchproto_(vdi_release_f) |
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vmod_hash_release(VCL_BACKEND dir) |
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{ |
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struct vmod_directors_hash *hash; |
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CHECK_OBJ_NOTNULL(dir, DIRECTOR_MAGIC); |
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CAST_OBJ_NOTNULL(hash, dir->priv, VMOD_DIRECTORS_HASH_MAGIC); |
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vdir_release(hash->vd); |
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} |
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static void v_matchproto_(vdi_destroy_f) |
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vmod_hash_destroy(VCL_BACKEND dir) |
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{ |
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struct vmod_directors_hash *rr; |
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CHECK_OBJ_NOTNULL(dir, DIRECTOR_MAGIC); |
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CAST_OBJ_NOTNULL(rr, dir->priv, VMOD_DIRECTORS_HASH_MAGIC); |
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vdir_delete(&rr->vd); |
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FREE_OBJ(rr); |
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} |
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static const struct vdi_methods vmod_hash_methods[1] = {{ |
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.magic = VDI_METHODS_MAGIC, |
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.type = "hash", |
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.release = vmod_hash_release, |
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.destroy = vmod_hash_destroy |
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}}; |
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VCL_VOID v_matchproto_() |
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vmod_hash__init(VRT_CTX, struct vmod_directors_hash **rrp, |
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const char *vcl_name) |
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{ |
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struct vmod_directors_hash *rr; |
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CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC); |
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AN(rrp); |
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AZ(*rrp); |
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ALLOC_OBJ(rr, VMOD_DIRECTORS_HASH_MAGIC); |
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AN(rr); |
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*rrp = rr; |
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vdir_new(ctx, &rr->vd, vcl_name, vmod_hash_methods, rr); |
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} |
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VCL_VOID v_matchproto_() |
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vmod_hash__fini(struct vmod_directors_hash **rrp) |
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{ |
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struct vmod_directors_hash *rr; |
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TAKE_OBJ_NOTNULL(rr, rrp, VMOD_DIRECTORS_HASH_MAGIC); |
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VRT_DelDirector(&rr->vd->dir); |
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} |
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VCL_VOID v_matchproto_() |
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vmod_hash_add_backend(VRT_CTX, |
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struct vmod_directors_hash *rr, VCL_BACKEND be, double w) |
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{ |
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CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC); |
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CHECK_OBJ_NOTNULL(rr, VMOD_DIRECTORS_HASH_MAGIC); |
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vdir_add_backend(ctx, rr->vd, be, w); |
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} |
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VCL_VOID v_matchproto_() |
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vmod_hash_remove_backend(VRT_CTX, |
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struct vmod_directors_hash *rr, VCL_BACKEND be) |
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{ |
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CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC); |
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CHECK_OBJ_NOTNULL(rr, VMOD_DIRECTORS_HASH_MAGIC); |
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vdir_remove_backend(ctx, rr->vd, be, NULL); |
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} |
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VCL_BACKEND v_matchproto_() |
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vmod_hash_backend(VRT_CTX, struct vmod_directors_hash *rr, VCL_STRANDS s) |
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{ |
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VCL_BACKEND be; |
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double r; |
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CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC); |
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CHECK_OBJ_ORNULL(ctx->bo, BUSYOBJ_MAGIC); |
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CHECK_OBJ_NOTNULL(rr, VMOD_DIRECTORS_HASH_MAGIC); |
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AN(s); |
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r = VRT_HashStrands32(s); |
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r = scalbn(r, -32); |
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assert(r >= 0 && r <= 1.0); |
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be = vdir_pick_be(ctx, rr->vd, r); |
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return (be); |
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} |