NAME

       vmod_purge - Varnish Purge Module

SYNOPSIS

       import purge [from "path"] ;

CONTENTS

       • INT hard()

       • INT soft(DURATION, DURATION, DURATION)

DESCRIPTION

       vmod_purge contains functions that offer a finer-grained control than the purge transition
       in 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);
              }
          }

   hard
          INT hard()

       Description
              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();

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

       Description
              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
              can  only  be called from vcl_hit or vcl_miss. It returns the number of soft-purged
              objects.

SEE ALSO

       • vcl(7)

COPYRIGHT

          Copyright (c) 2017 Varnish Software AS
          All rights reserved.

          Author: Dridi Boukelmoune <dridi.boukelmoune@gmail.com>

          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.

                                                                                    VMOD_PURGE(3)