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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.
*
* Director APIs
*
* A director ("VDI") is an abstract entity which can either satisfy a
* backend fetch request or select another director for the job.
*
* In theory a director does not have to talk HTTP over TCP, it can satisfy
* the backend request using any means it wants, although this is presently
* not implemented.
*
*/
typedef unsigned vdi_healthy_f(const struct director *, const struct busyobj *,
double *changed);
/* XXX need a VRT_CTX argument */
typedef const struct director *vdi_resolve_f(const struct director *,
struct worker *, struct busyobj *);
typedef int vdi_gethdrs_f(const struct director *, struct worker *,
struct busyobj *);
typedef int vdi_getbody_f(const struct director *, struct worker *,
struct busyobj *);
typedef const struct suckaddr *vdi_getip_f(const struct director *,
struct worker *, struct busyobj *);
typedef void vdi_finish_f(const struct director *, struct worker *,
struct busyobj *);
typedef enum sess_close vdi_http1pipe_f(const struct director *, struct req *,
struct busyobj *);
typedef void vdi_event_f(const struct director *, enum vcl_event_e);
typedef void vdi_destroy_f(const struct director *);
typedef void vdi_panic_f(const struct director *, struct vsb *);
struct director {
unsigned magic;
#define DIRECTOR_MAGIC 0x3336351d
const char *name;
char *vcl_name;
vdi_http1pipe_f *http1pipe;
vdi_healthy_f *healthy;
vdi_resolve_f *resolve;
vdi_gethdrs_f *gethdrs;
vdi_getbody_f *getbody;
vdi_getip_f *getip;
vdi_finish_f *finish;
vdi_event_f *event;
vdi_destroy_f *destroy;
vdi_panic_f *panic;
void *priv;
const void *priv2;
/* Internal Housekeeping fields */
char *display_name;
VTAILQ_ENTRY(director) vcl_list;
struct vcl *vcl;
unsigned health;
const struct vdi_ahealth *admin_health;
double health_changed;
};
unsigned VDI_Healthy(const struct director *, double *);
/* cache_vcl.c */
int VCL_AddDirector(struct vcl *, struct director *, const char *);
void VCL_DelDirector(struct director *);
/* cache_director.c */
#define VBE_AHEALTH_LIST \
VBE_AHEALTH(healthy, HEALTHY) \
VBE_AHEALTH(sick, SICK) \
VBE_AHEALTH(probe, PROBE) \
VBE_AHEALTH(deleted, DELETED)
#define VBE_AHEALTH(l,u) extern const struct vdi_ahealth * const VDI_AH_##u;
VBE_AHEALTH_LIST
#undef VBE_AHEALTH
const char *VDI_Ahealth(const struct director *d);
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