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/*
* include/haproxy/applet-t.h
* This file describes the applet struct and associated constants.
*
* Copyright (C) 2000-2020 Willy Tarreau - w@1wt.eu
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, version 2.1
* exclusively.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _HAPROXY_APPLET_T_H
#define _HAPROXY_APPLET_T_H
#include <haproxy/api-t.h>
#include <haproxy/buf-t.h>
#include <haproxy/dynbuf-t.h>
#include <haproxy/freq_ctr-t.h>
#include <haproxy/obj_type-t.h>
#include <haproxy/xref-t.h>
/* flags for appctx->state */
#define APPLET_WANT_DIE 0x01 /* applet was running and requested to die */
/* Room for per-command context (mostly CLI commands but not only) */
#define APPLET_MAX_SVCCTX 88
struct appctx;
struct proxy;
struct stconn;
struct sedesc;
struct session;
/* Applet descriptor */
struct applet {
enum obj_type obj_type; /* object type = OBJ_TYPE_APPLET */
/* 3 unused bytes here */
char *name; /* applet's name to report in logs */
int (*init)(struct appctx *); /* callback to init resources, may be NULL.
expect 0 if ok, -1 if an error occurs. */
void (*fct)(struct appctx *); /* internal I/O handler, may never be NULL */
void (*release)(struct appctx *); /* callback to release resources, may be NULL */
unsigned int timeout; /* execution timeout. */
};
/* Context of a running applet. */
struct appctx {
enum obj_type obj_type; /* OBJ_TYPE_APPCTX */
/* 3 unused bytes here */
unsigned short state; /* Internal appctx state */
unsigned int st0; /* CLI state for stats, session state for peers */
unsigned int st1; /* prompt/payload (bitwise OR of APPCTX_CLI_ST1_*) for stats, session error for peers */
struct buffer *chunk; /* used to store unfinished commands */
struct applet *applet; /* applet this context refers to */
struct session *sess; /* session for frontend applets (NULL for backend applets) */
struct sedesc *sedesc; /* stream endpoint descriptor the applet is attached to */
struct act_rule *rule; /* rule associated with the applet. */
int (*io_handler)(struct appctx *appctx); /* used within the cli_io_handler when st0 = CLI_ST_CALLBACK */
void (*io_release)(struct appctx *appctx); /* used within the cli_io_handler when st0 = CLI_ST_CALLBACK,
if the command is terminated or the session released */
int cli_severity_output; /* used within the cli_io_handler to format severity output of informational feedback */
int cli_level; /* the level of CLI which can be lowered dynamically */
char cli_payload_pat[8]; /* Payload pattern */
uint32_t cli_anon_key; /* the key to anonymise with the hash in cli */
struct buffer_wait buffer_wait; /* position in the list of objects waiting for a buffer */
struct task *t; /* task associated to the applet */
struct freq_ctr call_rate; /* appctx call rate */
struct list wait_entry; /* entry in a list of waiters for an event (e.g. ring events) */
/* The pointer seen by application code is appctx->svcctx. In 2.7 the
* anonymous union and the "ctx" struct disappeared, and the struct
* "svc" became svc_storage, which is never accessed directly by
* application code. Look at "show fd" for an example.
*/
/* here we have the service's context (CLI command, applet, etc) */
void *svcctx; /* pointer to a context used by the command, e.g. <storage> below */
struct {
void *shadow; /* shadow of svcctx above, do not use! */
char storage[APPLET_MAX_SVCCTX]; /* storage of svcctx above */
} svc; /* generic storage for most commands */
};
#endif /* _HAPROXY_APPLET_T_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/
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