/usr/include/varnish/cache/cache_backend.h is in libvarnishapi-dev 5.0.0-7+deb9u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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>
*
* 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 tcp_pool;
/*--------------------------------------------------------------------
* An instance of a backend from a VCL program.
*/
struct backend {
unsigned magic;
#define BACKEND_MAGIC 0x64c4c7c6
unsigned n_conn;
VTAILQ_ENTRY(backend) list;
VTAILQ_ENTRY(backend) vcl_list;
struct lock mtx;
VRT_BACKEND_FIELDS()
struct vcl *vcl;
char *display_name;
struct vbp_target *probe;
unsigned healthy;
const char *admin_health;
double health_changed;
struct VSC_C_vbe *vsc;
struct tcp_pool *tcp_pool;
struct director director[1];
double cooled;
};
/*---------------------------------------------------------------------
* Backend connection -- private to cache_backend*.c
*/
struct vbc {
unsigned magic;
#define VBC_MAGIC 0x0c5e6592
int fd;
VTAILQ_ENTRY(vbc) list;
const struct suckaddr *addr;
uint8_t state;
#define VBC_STATE_AVAIL (1<<0)
#define VBC_STATE_USED (1<<1)
#define VBC_STATE_STOLEN (1<<2)
#define VBC_STATE_CLEANUP (1<<3)
struct waited waited[1];
struct tcp_pool *tcp_pool;
pthread_cond_t *cond;
};
/*---------------------------------------------------------------------
* Prototypes
*/
/* cache_backend.c */
void VBE_fill_director(struct backend *be);
/* cache_backend_cfg.c */
unsigned VBE_Healthy(const struct backend *b, double *changed);
#ifdef VCL_MET_MAX
void VBE_Event(struct backend *, enum vcl_event_e);
#endif
void VBE_Delete(struct backend *be);
/* cache_backend_probe.c */
void VBP_Insert(struct backend *b, struct vrt_backend_probe const *p,
struct tcp_pool *);
void VBP_Remove(struct backend *b);
void VBP_Control(const struct backend *b, int stop);
void VBP_Status(struct cli *cli, const struct backend *, int details);
/* cache_backend_tcp.c */
struct tcp_pool *VBT_Ref(const struct suckaddr *ip4,
const struct suckaddr *ip6);
void VBT_Rel(struct tcp_pool **tpp);
int VBT_Open(const struct tcp_pool *tp, double tmo, const struct suckaddr **sa);
void VBT_Recycle(const struct worker *, struct tcp_pool *, struct vbc **);
void VBT_Close(struct tcp_pool *tp, struct vbc **vbc);
struct vbc *VBT_Get(struct tcp_pool *, double tmo, const struct backend *,
struct worker *);
void VBT_Wait(struct worker *, struct vbc *);
/* cache_vcl.c */
int VCL_AddBackend(struct vcl *, struct backend *);
void VCL_DelBackend(struct backend *);
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