/usr/include/varnish/cache/cache_backend.h is in libvarnishapi-dev 5.2.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 | /*-
* 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_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 */
void VBE_SetHappy(const struct backend *, uint64_t);
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 *);
|