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/*-
* Copyright (c) 2013 Varnish Software AS
* All rights reserved.
*
* Author: Poul-Henning Kamp <phk@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "config.h"
#include <math.h>
#include <stdlib.h>
#include "cache/cache.h"
#include "cache/cache_backend.h"
#include "vrt.h"
#include "vbm.h"
#include "vend.h"
#include "vsha256.h"
#include "vdir.h"
#include "vcc_if.h"
struct vmod_directors_hash {
unsigned magic;
#define VMOD_DIRECTORS_HASH_MAGIC 0xc08dd611
struct vdir *vd;
unsigned nloops;
struct vbitmap *vbm;
};
VCL_VOID __match_proto__()
vmod_hash__init(struct req *req, struct vmod_directors_hash **rrp,
const char *vcl_name)
{
struct vmod_directors_hash *rr;
AZ(req);
AN(rrp);
AZ(*rrp);
ALLOC_OBJ(rr, VMOD_DIRECTORS_HASH_MAGIC);
AN(rr);
rr->vbm = vbit_init(8);
AN(rr->vbm);
rr->nloops = 3; //
*rrp = rr;
vdir_new(&rr->vd, vcl_name, NULL, NULL, rr);
}
VCL_VOID __match_proto__()
vmod_hash__fini(struct req *req, struct vmod_directors_hash **rrp)
{
struct vmod_directors_hash *rr;
AZ(req);
rr = *rrp;
*rrp = NULL;
CHECK_OBJ_NOTNULL(rr, VMOD_DIRECTORS_HASH_MAGIC);
vdir_delete(&rr->vd);
vbit_destroy(rr->vbm);
FREE_OBJ(rr);
}
VCL_VOID __match_proto__()
vmod_hash_add_backend(struct req *req,
struct vmod_directors_hash *rr, VCL_BACKEND be, double w)
{
(void)req;
CHECK_OBJ_NOTNULL(rr, VMOD_DIRECTORS_HASH_MAGIC);
(void)vdir_add_backend(rr->vd, be, w);
}
VCL_BACKEND __match_proto__()
vmod_hash_backend(struct req *req, struct vmod_directors_hash *rr, const char *arg, ...)
{
struct SHA256Context ctx;
va_list ap;
const char *p;
unsigned char sha256[SHA256_LEN];
VCL_BACKEND be;
double r;
(void)req;
CHECK_OBJ_NOTNULL(rr, VMOD_DIRECTORS_HASH_MAGIC);
SHA256_Init(&ctx);
va_start(ap, arg);
p = arg;
while (p != vrt_magic_string_end) {
SHA256_Update(&ctx, arg, strlen(arg));
p = va_arg(ap, const char *);
}
va_end(ap);
SHA256_Final(sha256, &ctx);
r = vbe32dec(sha256);
r = scalbn(r, -32);
be = vdir_pick_be(rr->vd, req, r, rr->nloops);
return (be);
}
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