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/*-
* Copyright (c) 2006 Verdens Gang AS
* Copyright (c) 2006-2015 Varnish Software AS
* All rights reserved.
*
* Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
*
* SPDX-License-Identifier: BSD-2-Clause
*
* 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.
*
* Backend and APIs
*
* A backend ("VBE") is a director which talks HTTP over TCP.
*
* As you'll notice the terminology is a bit muddled here, but we try to
* keep it clean on the user-facing side, where a "director" is always
* a "pick a backend/director" functionality, and a "backend" is whatever
* satisfies the actual request in the end.
*
*/
struct vbp_target;
struct vrt_ctx;
struct vrt_backend_probe;
struct conn_pool;
struct connwait;
/*--------------------------------------------------------------------
* An instance of a backend from a VCL program.
*/
struct backend {
unsigned magic;
#define BACKEND_MAGIC 0x64c4c7c6
unsigned n_conn;
struct vrt_endpoint *endpoint;
VRT_BACKEND_FIELDS()
unsigned sick;
vtim_real changed;
struct vbp_target *probe;
struct vsc_seg *vsc_seg;
struct VSC_vbe *vsc;
struct conn_pool *conn_pool;
VCL_BACKEND director;
VTAILQ_HEAD(, connwait) cw_head;
unsigned cw_count;
};
/*---------------------------------------------------------------------
* Prototypes
*/
/* cache_backend_probe.c */
void VBP_Update_Backend(struct vbp_target *vt);
void VBP_Insert(struct backend *b, struct vrt_backend_probe const *p,
struct conn_pool *);
void VBP_Remove(struct backend *b);
void VBP_Control(const struct backend *b, int stop);
void VBP_Status(struct vsb *, const struct backend *, int details, int json);
void VBE_Connect_Error(struct VSC_vbe *, int err);
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