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#-
# Copyright (c) 2017 Varnish Software AS
# All rights reserved.
#
# Author: Dridi Boukelmoune <dridi.boukelmoune@gmail.com>
#
# 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.

$ABI strict
$Module purge 3 "Varnish Purge Module"

DESCRIPTION
===========

*vmod_purge* contains functions that offer a finer-grained control
than ``return(purge)`` from ``vcl_recv{}``. The functions can only be
called from ``vcl_hit{}`` or ``vcl_miss{}`` and they should in general
be used in both to ensure that all variants of a same object are taken
care of.

EXAMPLE
=======

::

    sub vcl_recv {
	if (req.method == "PURGE") {
	    if (client.ip !~ purge_acl) {
		return (synth(405));
	    }
	    return (hash);
	}
    }

    sub my_purge {
	set req.http.purged = purge.hard();
	if (req.http.purged == "0") {
	    return (synth(404));
	}
	else {
	    return (synth(200));
	}
    }

    sub vcl_hit {
	if (req.method == "PURGE") {
	    call my_purge;
	}
    }

    sub vcl_miss {
	if (req.method == "PURGE") {
	    call my_purge;
	}
    }

    sub vcl_synth {
	if (req.method == "PURGE") {
	    if (req.http.purged) {
		set resp.http.purged = req.http.purged;
	    }
	    return (deliver);
	}
    }

$Function INT hard()

This is equivalent to ``return(purge)`` but explicitly called from
``vcl_hit{}`` and ``vcl_miss{}``. It returns the number of purged
objects.

Example::

	set req.http.purged = purge.hard();

$Restrict vcl_hit vcl_miss

$Function INT soft(DURATION ttl = 0, DURATION grace = -1, DURATION keep = -1)

Sets the *ttl*, *grace* and *keep*.

By default, *ttl* is set to 0 with *grace* and *keep* periods left
untouched. Setting a negative value for *grace* or *keep* periods
leaves them untouched. Setting all three parameters to ``0`` is
equivalent to a hard purge. It returns the number of soft-purged objects.

$Restrict vcl_hit vcl_miss
SEE ALSO
========

* :ref:`vcl(7)`