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Apache-Reload/ 0000755 0000000 0000000 00000000000 12224342455 0013444 5 ustar 00root root 0000000 0000000 Apache-Reload/Changes 0000644 0000000 0000000 00000002460 12224342455 0014741 0 ustar 00root root 0000000 0000000 =head1 NAME
Changes - Apache::Reload change logfile
=head1 CHANGES
=over 1
=item 0.12 March 31, 2012
Set the -apxs argument correctly when building from mod_perl.
[Steve Hay]
Doc spelling fix
[Nicholas Bamber]
Add Apache-Test 1.34 dependency.
[Phred]
=item 0.11 August 21, 2010
Ignore require-hooks which exist in %INC
[Ryan Gies <ryan@livesite.net>]
Reloads by file, not module name
[Ryan Gies <ryan@livesite.net>]
Add a no Apache::Reload directive which skips reloading for modules
that have it included (useful for Moose compatibility).
[Graham Barr, <gbarr@pobox.com>]
Add Empty NOTICE file
http://rt.cpan.org/Ticket/Display.html?id=34786
[Niko Tyni (Debian Perl Group) <ntyni@debian.org>]
=item 0.10 February 25, 2008
Add make disttest procedure to RELEASE document - fred
Check for Apache::Test version 1.30, needed to run tests - fred
Apache::Reload and Apache2::Reload bundled for CPAN release
This release incorporates unreleased changes in 0.08 and 0.09
[Fred Moyer <fred@redhotpenguin.com>]
=item 0.09
Apache2::Reload was part of mod_perl2 core in this version
=item 0.08
Remove modified modules before reloading them
[Javier Ureuen Val]
Imported from v0.07 into ASF SVN
[Philip M. Gollucci <pgollucci@p6m7g8.com>]
Matt Sergeant <matt@sergeant.org> has donated Apache-Reload
to the ASF.
=back
Apache-Reload/LICENSE 0000644 0000000 0000000 00000026136 12224342455 0014461 0 ustar 00root root 0000000 0000000
Apache License
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Apache-Reload/MANIFEST 0000644 0000000 0000000 00000000303 12224342455 0014571 0 ustar 00root root 0000000 0000000 MANIFEST
Makefile.PL
README
LICENSE
lib/Apache/Reload.pm
lib/Apache2/Reload.pm
t/conf/extra.last.conf.in
t/all.t
t/reload.t
t/lib/Apache/TestReload.pm
t/lib/Apache2/TestReload.pm
RELEASE
Changes
Apache-Reload/Makefile.PL 0000644 0000000 0000000 00000015347 12224342455 0015430 0 ustar 00root root 0000000 0000000 use strict;
use Config;
my %prereqs = ();
my %mp2 = ( mod_perl2 => 1.99022 );
my %mp1 = ( mod_perl => 0 );
my $at_min_ver = 1.34;
my $mp_gen;
# MOD_PERL_2_BUILD is set from building from mod_perl Makefile.PL which should
# also set MP_APXS
if ($ENV{MOD_PERL_2_BUILD}) {
push @ARGV, "-apxs", $ENV{MP_APXS};
my $mp_gen = satisfy_mp_generation(2);
}
else {
$mp_gen = satisfy_mp_generation();
}
%prereqs = ($mp_gen == 1 ? %mp1 : %mp2);
my $HAS_APACHE_TEST = check_for_apache_test();
my %common_opts = (
PREREQ_PM => \%prereqs,
clean => { FILES => 't/TEST' },
);
if ($mp_gen == 1) {
require ExtUtils::MakeMaker;
ExtUtils::MakeMaker::WriteMakefile(
%common_opts,
VERSION_FROM => "lib/Apache/Reload.pm",
NAME => "Apache::Reload",
ABSTRACT_FROM => 'lib/Apache/Reload.pm',
);
}
else {
require ModPerl::MM;
ModPerl::MM::WriteMakefile(
%common_opts,
VERSION_FROM => "lib/Apache2/Reload.pm",
NAME => "Apache2::Reload",
ABSTRACT_FROM => 'lib/Apache2/Reload.pm',
);
}
sub check_for_apache_test {
return unless eval {
require Apache::Test;
if ($Apache::Test::VERSION < $at_min_ver) {
die "Apache::Test version is " . $Apache::Test::VERSION .
", minimum version required is $at_min_ver" .
", tests will be skipped\n";
}
require Apache::TestMM;
require Apache::TestRunPerl;
1;
};
Apache::TestMM::filter_args();
my %args = @Apache::TestMM::Argv;
Apache::TestRunPerl->generate_script();
return 1;
}
# If a specific generation was passed as an argument,
# if satisfied
# return the same generation
# else
# die
# else @ARGV and %ENV will be checked for specific orders
# if the specification will be found
# if satisfied
# return the specified generation
# else
# die
# else if any mp generation is found
# return it
# else
# die
sub satisfy_mp_generation {
my $wanted = shift || wanted_mp_generation();
unless ($wanted == 1 || $wanted == 2) {
die "don't know anything about mod_perl generation: $wanted\n" .
"currently supporting only generations 1 and 2";
}
my $selected = 0;
if ($wanted == 1) {
require_mod_perl();
if ($mod_perl::VERSION >= 1.99) {
# so we don't pick 2.0 version if 1.0 is wanted
die "You don't seem to have mod_perl 1.0 installed";
}
$selected = 1;
}
elsif ($wanted == 2) {
#warn "Looking for mod_perl 2.0";
require_mod_perl();
if ($mod_perl::VERSION < 2.0) {
die "You don't seem to have mod_perl 2.0 installed";
}
$selected = 2;
}
else {
require_mod_perl();
$selected = $mod_perl::VERSION >= 1.99 ? 2 : 1;
warn "Using $mod_perl::VERSION\n";
}
return $selected;
}
sub require_mod_perl {
eval { require mod_perl };
eval { require mod_perl2 } if ($@);
die "Can't find mod_perl installed\nThe error was: $@" if $@;
}
# the function looks at %ENV and Makefile.PL option to figure out
# whether a specific mod_perl generation was requested.
# It uses the following logic:
# via options:
# perl Makefile.PL MOD_PERL=2
# or via %ENV:
# env MOD_PERL=1 perl Makefile.PL
#
# return value is:
# 1 or 2 if the specification was found (mp 1 and mp 2 respectively)
# 0 otherwise
sub wanted_mp_generation {
# check if we have a command line specification
# flag: 0: unknown, 1: mp1, 2: mp2
my $flag = 0;
foreach my $key (@ARGV) {
if ($key =~ /^MOD_PERL=(\d)$/) {
$flag = $1;
}
}
# check %ENV
my $env = exists $ENV{MOD_PERL} ? $ENV{MOD_PERL} : 0;
# check for contradicting requirements
if ($env && $flag && $flag != $env) {
die <<EOF;
Can\'t decide which mod_perl version should be used, since you have
supplied contradicting requirements:
enviroment variable MOD_PERL=$env
Makefile.PL option MOD_PERL=$flag
EOF
}
my $wanted = 0;
$wanted = 2 if $env == 2 || $flag == 2;
$wanted = 1 if $env == 1 || $flag == 1;
unless ($wanted) {
# if still unknown try to require mod_perl.pm
eval { require mod_perl };
if ($@) {
# if we don't have mp1, check for mp2
# see if we are in the mp2 build structure
eval { require File::Spec };
unless ($@) {
my $mplib = File::Spec->catdir('..', 'lib');
unshift @INC, $mplib if -e File::Spec->catfile($mplib,'mod_perl2.pm');
my $atlib = File::Spec->catdir('../', 'Apache-Test', 'lib');
unshift @INC, $atlib if -d $atlib;
}
eval { require mod_perl2 } if ($@);
unless ($@) {
$wanted = 2;
}
}
else {
$wanted = 1;
}
}
return $wanted;
}
package MY;
sub postamble {
my $self = shift;
my $string = $self->SUPER::postamble;
$string .= <<'EOF';
tag :
svn copy https://svn.apache.org/repos/asf/perl/Apache-Reload/trunk https://svn.apache.org/repos/asf/perl/Apache-Reload/tags/$(VERSION_SYM)
@echo update lib/Apache/Reload.pm VERSION now
EOF
return $string;
}
sub test {
my $self = shift;
eval { require Test::More } or return <<EOF;
test::
\t\@echo sorry, cannot run tests without Test::More
EOF
return $self->Apache::TestMM::test(@_) if $HAS_APACHE_TEST;
return <<EOF
test::
\t\@echo
\t\@echo sorry, cannot run tests without a properly
\t\@echo configured Apache-Test environment, mininum
\t\@echo Apache::Test version needed is $at_min_ver
\t\@echo
EOF
}
sub clean {
my $self = shift;
return $self->Apache::TestMM::clean(@_) if $HAS_APACHE_TEST;
return $self->SUPER::clean(@_);
}
sub constants {
my $self = shift;
my $string = $self->MM::constants;
# mp2 installs this into INSTALLSITEARCH, so in order to avoid
# problems when users forget 'make install UNINST=1', trick MM into
# installing pure perl modules to the sitearch location, when this is
# not installed as a part of mp2 build
if (!$ENV{MOD_PERL_2_BUILD}) {
$string .= <<'EOI';
# install into the same location as mod_perl 2.0
INSTALLSITELIB = $(INSTALLSITEARCH)
DESTINSTALLSITELIB = $(DESTINSTALLSITEARCH)
EOI
}
$string;
}
Apache-Reload/NOTICE 0000644 0000000 0000000 00000000000 12224342455 0014336 0 ustar 00root root 0000000 0000000 Apache-Reload/README 0000644 0000000 0000000 00000006270 12224342455 0014331 0 ustar 00root root 0000000 0000000 NAME
Apache::Reload - Reload changed modules
SYNOPSIS
In httpd.conf:
PerlInitHandler Apache::Reload
PerlSetVar ReloadAll Off
Then your module:
package My::Apache::Module;
use Apache::Reload;
sub handler { ... }
1;
DESCRIPTION
This module is two things. First it is an adaptation of Randal
Schwartz's Stonehenge::Reload module that attempts to be a
little more intuitive and makes the usage easier.
Stonehenge::Reload was written by Randal to make specific
modules reload themselves when they changed. Unlike
Apache::StatINC, Stonehenge::Reload only checked the change time
of modules that registered themselves with Stonehenge::Reload,
thus reducing stat() calls. Apache::Reload also offers the exact
same functionality as Apache::StatINC, and is thus designed to
be a drop-in replacement. Apache::Reload only checks modules
that register themselves with Apache::Reload if you explicitly
turn off the StatINC emulation method (see below). Like
Apache::StatINC, Apache::Reload must be installed as an Init
Handler.
StatINC Replacement
To use as a StatINC replacement, simply add the following
configuration to your httpd.conf:
PerlInitHandler Apache::Reload
Register Modules Implicitly
To only reload modules that have registered with Apache::Reload,
add the following to the httpd.conf:
PerlInitHandler Apache::Reload
PerlSetVar ReloadAll Off
# ReloadAll defaults to On
Then any modules with the line:
use Apache::Reload;
Will be reloaded when they change.
Register Modules Explicitly
You can also register modules explicitly in your httpd.conf file
that you want to be reloaded on change:
PerlInitHandler Apache::Reload
PerlSetVar ReloadAll Off
PerlSetVar ReloadModules "My::Foo My::Bar Foo::Bar::Test"
Note that these are split on whitespace, but the module list
must be in quotes, otherwise Apache tries to parse the parameter
list.
Special "Touch" File
You can also set a file that you can touch() that causes the
reloads to be performed. If you set this, and don't touch() the
file, the reloads don't happen. This can be a great boon in a
live environment:
PerlSetVar ReloadTouchFile /tmp/reload_modules
Now when you're happy with your changes, simply go to the
command line and type:
touch /tmp/reload_modules
And your modules will be magically reloaded on the next request.
This option works in both StatINC emulation mode and the
registered modules mode.
PSUEDOHASHES
The short summary of this is: Don't use psuedohashes. Use an
array with constant indexes. Its faster in the general case, its
more guaranteed, and generally, it works.
The long summary is that I've done some work to get this working
with modules that use psuedo hashes, but its still broken in the
case of a single module that contains multiple packages that all
use psuedohashes.
So don't do that.
AUTHOR
Matt Sergeant, matt@sergeant.org
MAINTAINERS
the mod_perl developers, dev@perl.apache.org
SEE ALSO
Apache::StatINC, Stonehenge::Reload
Apache-Reload/RELEASE 0000644 0000000 0000000 00000007061 12224342455 0014453 0 ustar 00root root 0000000 0000000 Instructions for Apache-Reload Release Manager
0. Ask the PMC to verify that you have the appropriate CPAN permissions
on dev@perl.
make sure your public key is in the KEYS file in the mod_perl docs.
you should only need to do this if this is your first time playing
Release Manager
$ cd mod_perl-docs
$ grep $USER src/dist/KEYS
note that the KEYS file itself contains all the instructions you
need on how to add your key. if you need further help on gpg
(like how to create a key in the first place) you can look here
http://people.apache.org/~geoff/gpghowto.html
Copy the KEYS file into place:
% scp KEYS www.apache.org:/www/www.apache.org/dist/perl/KEYS
If this is your first release, ask someone with APML karma on PAUSE
to verify you have the appropriate permissions. Likely someone on
the PMC can do this.
a. login into https://pause.perl.org
b. menu click: Select Mailinglist/Action
c. choose APML and share_perms and click go
d. click 3.3 Make somebody else co-maintainer
e. choose the modules to give the perms to
type the username of the new co-maintainer
f. if you happen to know that packages were added this release,
make sure you give the correct permissions to them.
MAINTAINER_BUILDING_RELEASE=1 perl Makefile.PL
1. 'make disttest' - to make sure nothing is missing from the manifest.
Now 'make dist', and test this generated package (not svn)
with as many configurations as possible on as many platforms
as possible.
a. edit ./Changes:
- find lib -type f -name "*.pm" | \
xargs perl -pi -e 's,0.12-dev,0.12-rc1,g'
- perl -pi -e 's,0.12-dev,0.12-rc1,g' Changes
- don't commit these (see dev@ archives)
b. nuke any preinstalled Apache-Reload libs and run 'make test'
c. test that you can 'make install' and then run 'make test' again
d. test whether we still 100% OK on systems with no LWP:
% APACHE_TEST_PRETEND_NO_LWP=1 make test
2. once confident that the package is good, upload a release candidate
to people.apache.org/~username and post 24 hour-ish candidate alert
to the various lists
o dev/perl.apache.org
o modperl/perl.apache.org
Subject: [RELEASE CANDIDATE] Apache-Reload 0.12 RC\d+
(or maybe longer to give most people a chance to catch up). no need
to tag this package
a. if problems are detected during stage 2, repeat stages 1 and 2.
3. when the package has been reported to be good, prepare a new
package to be released
a. edit ./Changes
- remove -rc\d+ (from lib/Apache/Reload.pm and lib/Apache2/Reload.pm also)
- add release date
b. rerun:
% perl Makefile.PL
make sure tag looks right
% make -n tag
c. commit Changes
% svn ci Changes
d. tag
% make tag
e. create the final package
% make dist
f. test the final package again at least once
4. Upload the package to CPAN
5. Announce the package
a. post ... to the modperl, announce lists
Subject: [ANNOUNCE] Apache-Reload 0.12
include
- MD5 sig (as it comes from CPAN upload announce).
- the latest Changes
6. Prepare for the next cycle
a. increment version in lib/Apache/Reload.pm
b. edit ./Changes:
- start a new item with incremented version + '-dev'
=item 0.13-dev
c. bump up version numbers in this file to make it easier to do the
next release.
$ perl -pi -e 's/(\d+)\.(\d+)/join(".", $1, $2+1)/eg' RELEASE
d. commit Changes
% svn ci -m "start 0.12-dev cycle" Changes RELEASE \
lib/Apache/Reload.pm lib/Apache2/Reload.pm
Apache-Reload/lib/ 0000755 0000000 0000000 00000000000 12224342455 0014212 5 ustar 00root root 0000000 0000000 Apache-Reload/lib/Apache/ 0000755 0000000 0000000 00000000000 12224342455 0015373 5 ustar 00root root 0000000 0000000 Apache-Reload/lib/Apache/Reload.pm 0000644 0000000 0000000 00000020415 12224342455 0017141 0 ustar 00root root 0000000 0000000 # Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
package Apache::Reload;
use strict;
$Apache::Reload::VERSION = '0.12';
use vars qw(%INCS %Stat $TouchTime %UndefFields %Ignore);
%Stat = ($INC{"Apache/Reload.pm"} => time);
$TouchTime = time;
sub import {
my $class = shift;
my ($package,$file) = (caller)[0,1];
$class->register_module($package, $file);
}
sub unimport {
my $class = shift;
my ($package,$file) = (caller)[0,1];
$class->unregister_module($package, $file);
}
sub package_to_module {
my $package = shift;
$package =~ s/::/\//g;
$package .= ".pm";
return $package;
}
sub register_module {
my ($class, $package, $file) = @_;
my $module = package_to_module($package);
if ($file) {
$INCS{$module} = $file;
}
else {
$file = $INC{$module};
return unless $file;
$INCS{$module} = $file;
}
no strict 'refs';
if (%{"${package}::FIELDS"}) {
$UndefFields{$module} = "${package}::FIELDS";
}
}
sub unregister_module {
my ($class, $package, $file) = @_;
my $module = package_to_module($package);
$Ignore{$module} = 1;
}
sub handler {
my $r = shift;
my $DEBUG = ref($r) && (lc($r->dir_config("ReloadDebug") || '') eq 'on');
my $TouchFile = ref($r) && $r->dir_config("ReloadTouchFile");
my $TouchModules;
if ($TouchFile) {
warn "Checking mtime of $TouchFile\n" if $DEBUG;
my $touch_mtime = (stat($TouchFile))[9] || return 1;
return 1 unless $touch_mtime > $TouchTime;
$TouchTime = $touch_mtime;
my $sym = Apache->gensym;
open($sym, $TouchFile) || die "Can't open '$TouchFile': $!";
$TouchModules = <$sym>;
chomp $TouchModules;
}
if (ref($r) && (lc($r->dir_config("ReloadAll") || 'on') eq 'on')) {
*Apache::Reload::INCS = \%INC;
}
else {
*Apache::Reload::INCS = \%INCS;
my $ExtraList =
$TouchModules ||
(ref($r) && $r->dir_config("ReloadModules")) ||
'';
my @extra = split(/\s+/, $ExtraList);
foreach (@extra) {
if (/(.*)::\*$/) {
my $prefix = $1;
$prefix =~ s/::/\//g;
foreach my $match (keys %INC) {
if ($match =~ /^\Q$prefix\E/) {
$Apache::Reload::INCS{$match} = $INC{$match};
my $package = $match;
$package =~ s/\//::/g;
$package =~ s/\.pm$//;
no strict 'refs';
# warn "checking for FIELDS on $package\n";
if (%{"${package}::FIELDS"}) {
# warn "found fields in $package\n";
$UndefFields{$match} = "${package}::FIELDS";
}
}
}
}
else {
Apache::Reload->register_module($_);
}
}
}
my @changed;
while (my($key, $file) = each %Apache::Reload::INCS) {
local $^W;
warn "Apache::Reload: Checking mtime of $key\n" if $DEBUG;
my $mtime = (stat $file)[9];
unless (defined($mtime) && $mtime) {
for (@INC) {
$mtime = (stat "$_/$file")[9];
last if defined($mtime) && $mtime;
}
}
warn("Apache::Reload: Can't locate $file\n"),next
unless defined $mtime and $mtime;
unless (defined $Stat{$file}) {
$Stat{$file} = $^T;
}
# remove the modules
if ($mtime > $Stat{$file}) {
if ($Ignore{$key}) {
warn "Apache::Reload: Not reloading $key\n";
}
else {
delete $INC{$key};
push @changed, $key;
}
}
$Stat{$file} = $mtime;
}
# reload the modules
foreach my $key (@changed) {
warn("Reloading $key\n") if $DEBUG;
if (my $symref = $UndefFields{$key}) {
warn("undeffing fields\n") if $DEBUG;
no strict 'refs';
undef %{$symref};
}
require $key;
warn("Apache::Reload: process $$ reloading $key\n")
if $DEBUG;
}
return 1;
}
1;
__END__
=head1 NAME
Apache::Reload - Reload changed modules
=head1 SYNOPSIS
In httpd.conf:
PerlInitHandler Apache::Reload
PerlSetVar ReloadAll Off
Then your module:
package My::Apache::Module;
use Apache::Reload;
sub handler { ... }
1;
=head1 DESCRIPTION
This module is two things. First it is an adaptation of Randal
Schwartz's Stonehenge::Reload module that attempts to be a little
more intuitive and makes the usage easier. Stonehenge::Reload was
written by Randal to make specific modules reload themselves when
they changed. Unlike Apache::StatINC, Stonehenge::Reload only checked
the change time of modules that registered themselves with
Stonehenge::Reload, thus reducing stat() calls. Apache::Reload also
offers the exact same functionality as Apache::StatINC, and is thus
designed to be a drop-in replacement. Apache::Reload only checks modules
that register themselves with Apache::Reload if you explicitly turn off
the StatINC emulation method (see below). Like Apache::StatINC,
Apache::Reload must be installed as an Init Handler.
=head2 StatINC Replacement
To use as a StatINC replacement, simply add the following configuration
to your httpd.conf:
PerlInitHandler Apache::Reload
=head2 Register Modules Implicitly
To only reload modules that have registered with Apache::Reload,
add the following to the httpd.conf:
PerlInitHandler Apache::Reload
PerlSetVar ReloadAll Off
# ReloadAll defaults to On
Then any modules with the line:
use Apache::Reload;
Will be reloaded when they change.
=head2 Register Modules Explicitly
You can also register modules explicitly in your httpd.conf file that
you want to be reloaded on change:
PerlInitHandler Apache::Reload
PerlSetVar ReloadAll Off
PerlSetVar ReloadModules "My::Foo My::Bar Foo::Bar::Test"
Note that these are split on whitespace, but the module list B<must>
be in quotes, otherwise Apache tries to parse the parameter list.
=head2 Un-Register Modules Explicitly
If ReloadAll is set to On, then you can explicity force a module not to be reloaded with
no Apache::Reload;
A warning will appear in the error log that the file has changed, but will
not be reloaded
=head2 Special "Touch" File
You can also set a file that you can touch() that causes the reloads to be
performed. If you set this, and don't touch() the file, the reloads don't
happen. This can be a great boon in a live environment:
PerlSetVar ReloadTouchFile /tmp/reload_modules
Now when you're happy with your changes, simply go to the command line and
type:
touch /tmp/reload_modules
And your modules will be magically reloaded on the next request. This option
works in both StatINC emulation mode and the registered modules mode.
=head1 PSUEDOHASHES
The short summary of this is: Don't use psuedohashes. Use an array with
constant indexes. Its faster in the general case, its more guaranteed, and
generally, it works.
The long summary is that I've done some work to get this working with
modules that use psuedo hashes, but its still broken in the case of a
single module that contains multiple packages that all use psuedohashes.
So don't do that.
=head1 AUTHOR
Matt Sergeant, matt@sergeant.org
=head1 MAINTAINERS
the mod_perl developers, dev@perl.apache.org
=head1 SEE ALSO
Apache::StatINC, Stonehenge::Reload
=cut
Apache-Reload/lib/Apache2/ 0000755 0000000 0000000 00000000000 12224342455 0015455 5 ustar 00root root 0000000 0000000 Apache-Reload/lib/Apache2/Reload.pm 0000644 0000000 0000000 00000043500 12224342455 0017223 0 ustar 00root root 0000000 0000000 # Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
package Apache2::Reload;
use strict;
use warnings FATAL => 'all';
our $VERSION = '0.12';
use Apache2::Const -compile => qw(OK);
use Apache2::Connection;
use Apache2::ServerUtil;
use Apache2::RequestUtil;
use ModPerl::Util ();
use vars qw(%INCS %Stat $TouchTime);
%Stat = ($INC{"Apache2/Reload.pm"} => time);
$TouchTime = time;
sub import {
my $class = shift;
my ($package, $file) = (caller)[0,1];
$class->register_module($package, $file);
}
sub package_to_module {
my $package = shift;
$package =~ s/::/\//g;
$package .= ".pm";
return $package;
}
sub module_to_package {
my $module = shift;
$module =~ s/\//::/g;
$module =~ s/\.pm$//g;
return $module;
}
sub register_module {
my ($class, $package, $file) = @_;
my $module = package_to_module($package);
if ($file) {
$INCS{$module} = $file;
}
else {
$file = $INC{$module};
return unless $file;
$INCS{$module} = $file;
}
}
sub unregister_module {
my ($class, $package) = @_;
my $module = package_to_module($package);
delete $INCS{$module};
}
# the first argument is:
# $c if invoked as 'PerlPreConnectionHandler'
# $r if invoked as 'PerlInitHandler'
sub handler {
my $o = shift;
$o = $o->base_server if ref($o) eq 'Apache2::Connection';
my $DEBUG = ref($o) && (lc($o->dir_config("ReloadDebug") || '') eq 'on');
my $ReloadByModuleName = ref($o) && (lc($o->dir_config("ReloadByModuleName") || '') eq 'on');
my $TouchFile = ref($o) && $o->dir_config("ReloadTouchFile");
my $ConstantRedefineWarnings = ref($o) &&
(lc($o->dir_config("ReloadConstantRedefineWarnings") || '') eq 'off')
? 0 : 1;
my $TouchModules;
if ($TouchFile) {
warn "Checking mtime of $TouchFile\n" if $DEBUG;
my $touch_mtime = (stat $TouchFile)[9] || return Apache2::Const::OK;
return Apache2::Const::OK unless $touch_mtime > $TouchTime;
$TouchTime = $touch_mtime;
open my $fh, $TouchFile or die "Can't open '$TouchFile': $!";
$TouchModules = <$fh>;
chomp $TouchModules if $TouchModules;
}
if (ref($o) && (lc($o->dir_config("ReloadAll") || 'on') eq 'on')) {
*Apache2::Reload::INCS = \%INC;
}
else {
*Apache2::Reload::INCS = \%INCS;
my $ExtraList =
$TouchModules ||
(ref($o) && $o->dir_config("ReloadModules")) ||
'';
my @extra = split /\s+/, $ExtraList;
foreach (@extra) {
if (/(.*)::\*$/) {
my $prefix = $1;
$prefix =~ s/::/\//g;
foreach my $match (keys %INC) {
if ($match =~ /^\Q$prefix\E/) {
$Apache2::Reload::INCS{$match} = $INC{$match};
}
}
}
else {
Apache2::Reload->register_module($_);
}
}
}
my $ReloadDirs = ref($o) && $o->dir_config("ReloadDirectories");
my @watch_dirs = split(/\s+/, $ReloadDirs||'');
my @changed;
foreach my $key (sort { $a cmp $b } keys %Apache2::Reload::INCS) {
my $file = $Apache2::Reload::INCS{$key};
next unless defined $file;
next if ref $file;
next if @watch_dirs && !grep { $file =~ /^$_/ } @watch_dirs;
warn "Apache2::Reload: Checking mtime of $key\n" if $DEBUG;
my $mtime = (stat $file)[9];
unless (defined($mtime) && $mtime) {
for (@INC) {
$mtime = (stat "$_/$file")[9];
last if defined($mtime) && $mtime;
}
}
warn("Apache2::Reload: Can't locate $file\n"), next
unless defined $mtime and $mtime;
unless (defined $Stat{$file}) {
$Stat{$file} = $^T;
}
if ($mtime > $Stat{$file}) {
push @changed, [$key, $file];
}
$Stat{$file} = $mtime;
}
#First, let's unload all changed modules
foreach my $change (@changed) {
my ($module, $file) = @$change;
my $package = module_to_package($module);
ModPerl::Util::unload_package($package);
}
#Then, let's reload them all, so that module dependencies can satisfy
#themselves in the correct order.
foreach my $change (@changed) {
my ($module, $file) = @$change;
my $name = $ReloadByModuleName ? $module : $file;
require $name;
if ($DEBUG) {
my $package = module_to_package($module);
warn sprintf("Apache2::Reload: process %d reloading %s from %s\n",
$$, $package, $name);
}
}
return Apache2::Const::OK;
}
1;
__END__
=head1 NAME
Apache2::Reload - Reload Perl Modules when Changed on Disk
=head1 Synopsis
# Monitor and reload all modules in %INC:
# httpd.conf:
PerlModule Apache2::Reload
PerlInitHandler Apache2::Reload
# when working with protocols and connection filters
# PerlPreConnectionHandler Apache2::Reload
# Reload groups of modules:
# httpd.conf:
PerlModule Apache2::Reload
PerlInitHandler Apache2::Reload
PerlSetVar ReloadAll Off
PerlSetVar ReloadModules "ModPerl::* Apache2::*"
#PerlSetVar ReloadDebug On
#PerlSetVar ReloadByModuleName On
# Reload a single module from within itself:
package My::Apache2::Module;
use Apache2::Reload;
sub handler { ... }
1;
=head1 Description
C<Apache2::Reload> reloads modules that change on the disk.
When Perl pulls a file via C<require>, it stores the filename in the
global hash C<%INC>. The next time Perl tries to C<require> the same
file, it sees the file in C<%INC> and does not reload from disk. This
module's handler can be configured to iterate over the modules in
C<%INC> and reload those that have changed on disk or only specific
modules that have registered themselves with C<Apache2::Reload>. It can
also do the check for modified modules, when a special touch-file has
been modified.
Require-hooks, i.e., entries in %INC which are references, are ignored. The
hook should modify %INC itself, adding the path to the module file, for it to
be reloaded.
C<Apache2::Reload> inspects and reloads the B<file> associated with a given
module. Changes to @INC are not recognized, as it is the file which is
being re-required, not the module name.
In version 0.10 and earlier the B<module name>, not the file, is re-required.
Meaning it operated on the the current context of @INC. If you still want this
behavior set this environment variable in I<httpd.conf>:
PerlSetVar ReloadByModuleName On
This means, when called as a C<Perl*Handler>, C<Apache2::Reload> will not see
C<@INC> paths added or removed by C<ModPerl::Registry> scripts, as the value of
C<@INC> is saved on server startup and restored to that value after each
request. In other words, if you want C<Apache2::Reload> to work with modules
that live in custom C<@INC> paths, you should modify C<@INC> when the server is
started. Besides, C<'use lib'> in the startup script, you can also set the
C<PERL5LIB> variable in the httpd's environment to include any non-standard
'lib' directories that you choose. For example, to accomplish that you can
include a line:
PERL5LIB=/home/httpd/perl/extra; export PERL5LIB
in the script that starts Apache. Alternatively, you can set this
environment variable in I<httpd.conf>:
PerlSetEnv PERL5LIB /home/httpd/perl/extra
=head2 Monitor All Modules in C<%INC>
To monitor and reload all modules in C<%INC> at the beginning of
request's processing, simply add the following configuration to your
I<httpd.conf>:
PerlModule Apache2::Reload
PerlInitHandler Apache2::Reload
When working with connection filters and protocol modules
C<Apache2::Reload> should be invoked in the pre_connection stage:
PerlPreConnectionHandler Apache2::Reload
See also the discussion on
C<L<PerlPreConnectionHandler|docs::2.0::user::handlers::protocols/PerlPreConnectionHandler>>.
=head2 Register Modules Implicitly
To only reload modules that have registered with C<Apache2::Reload>,
add the following to the I<httpd.conf>:
PerlModule Apache2::Reload
PerlInitHandler Apache2::Reload
PerlSetVar ReloadAll Off
# ReloadAll defaults to On
Then any modules with the line:
use Apache2::Reload;
Will be reloaded when they change.
=head2 Register Modules Explicitly
You can also register modules explicitly in your I<httpd.conf> file
that you want to be reloaded on change:
PerlModule Apache2::Reload
PerlInitHandler Apache2::Reload
PerlSetVar ReloadAll Off
PerlSetVar ReloadModules "My::Foo My::Bar Foo::Bar::Test"
Note that these are split on whitespace, but the module list B<must>
be in quotes, otherwise Apache tries to parse the parameter list.
The C<*> wild character can be used to register groups of files under
the same namespace. For example the setting:
PerlSetVar ReloadModules "ModPerl::* Apache2::*"
will monitor all modules under the namespaces C<ModPerl::> and
C<Apache2::>.
=head2 Monitor Only Certain Sub Directories
To reload modules only in certain directories (and their
subdirectories) add the following to the I<httpd.conf>:
PerlModule Apache2::Reload
PerlInitHandler Apache2::Reload
PerlSetVar ReloadDirectories "/tmp/project1 /tmp/project2"
You can further narrow the list of modules to be reloaded from the
chosen directories with C<ReloadModules> as in:
PerlModule Apache2::Reload
PerlInitHandler Apache2::Reload
PerlSetVar ReloadDirectories "/tmp/project1 /tmp/project2"
PerlSetVar ReloadAll Off
PerlSetVar ReloadModules "MyApache2::*"
In this configuration example only modules from the namespace
C<MyApache2::> found in the directories I</tmp/project1/> and
I</tmp/project2/> (and their subdirectories) will be reloaded.
=head2 Special "Touch" File
You can also declare a file, which when gets C<touch(1)>ed, causes the
reloads to be performed. For example if you set:
PerlSetVar ReloadTouchFile /tmp/reload_modules
and don't C<touch(1)> the file I</tmp/reload_modules>, the reloads
won't happen until you go to the command line and type:
% touch /tmp/reload_modules
When you do that, the modules that have been changed, will be
magically reloaded on the next request. This option works with any
mode described before.
=head2 Unregistering a module
In some cases, it might be necessary to explicitly stop reloading
a module.
Apache2::Reload->unregister_module('Some::Module');
But be carefull, since unregistering a module in this way will only
do so for the current interpreter. This feature should be used with
care.
=head1 Performance Issues
This module is perfectly suited for a development environment. Though
it's possible that you would like to use it in a production
environment, since with C<Apache2::Reload> you don't have to restart
the server in order to reload changed modules during software
updates. Though this convenience comes at a price:
=over
=item *
If the "touch" file feature is used, C<Apache2::Reload> has to stat(2)
the touch file on each request, which adds a slight but most likely
insignificant overhead to response times. Otherwise C<Apache2::Reload>
will stat(2) each registered module or even worse--all modules in
C<%INC>, which will significantly slow everything down.
=item *
Once the child process reloads the modules, the memory used by these
modules is not shared with the parent process anymore. Therefore the
memory consumption may grow significantly.
=back
Therefore doing a full server stop and restart is probably a better
solution.
=head1 Debug
If you aren't sure whether the modules that are supposed to be
reloaded, are actually getting reloaded, turn the debug mode on:
PerlSetVar ReloadDebug On
=head1 Caveats
=head2 Problems With Reloading Modules Which Do Not Declare Their Package Name
If you modify modules, which don't declare their C<package>, and rely on
C<Apache2::Reload> to reload them, you may encounter problems: i.e.,
it'll appear as if the module wasn't reloaded when in fact it
was. This happens because when C<Apache2::Reload> C<require()>s such a
module all the global symbols end up in the C<Apache2::Reload>
namespace! So the module does get reloaded and you see the compile
time errors if there are any, but the symbols don't get imported to
the right namespace. Therefore the old version of the code is running.
=head2 Failing to Find a File to Reload
C<Apache2::Reload> uses C<%INC> to find the files on the filesystem. If
an entry for a certain filepath in C<%INC> is relative,
C<Apache2::Reload> will use C<@INC> to try to resolve that relative
path. Now remember that mod_perl freezes the value of C<@INC> at the
server startup, and you can modify it only for the duration of one
request when you need to load some module which is not in on of the
C<@INC> directories. So a module gets loaded, and registered in
C<%INC> with a relative path. Now when C<Apache2::Reload> tries to find
that module to check whether it has been modified, it can't find since
its directory is not in C<@INC>. So C<Apache2::Reload> will silently
skip that module.
You can enable the C<Debug|/Debug> mode to see what C<Apache2::Reload>
does behind the scenes.
=head2 Problems with Scripts Running with Registry Handlers that Cache the Code
The following problem is relevant only to registry handlers that cache
the compiled script. For example it concerns
C<L<ModPerl::Registry|docs::2.0::api::ModPerl::Registry>> but not
C<L<ModPerl::PerlRun|docs::2.0::api::ModPerl::PerlRun>>.
=head3 The Problem
Let's say that there is a module C<My::Utils>:
#file:My/Utils.pm
#----------------
package My::Utils;
BEGIN { warn __PACKAGE__ , " was reloaded\n" }
use base qw(Exporter);
@EXPORT = qw(colour);
sub colour { "white" }
1;
And a registry script F<test.pl>:
#file:test.pl
#------------
use My::Utils;
print "Content-type: text/plain\n\n";
print "the color is " . colour();
Assuming that the server is running in a single mode, we request the
script for the first time and we get the response:
the color is white
Now we change F<My/Utils.pm>:
- sub colour { "white" }
+ sub colour { "red" }
And issue the request again. C<Apache2::Reload> does its job and we can
see that C<My::Utils> was reloaded (look in the I<error_log>
file). However the script still returns:
the color is white
=head3 The Explanation
Even though F<My/Utils.pm> was reloaded, C<ModPerl::Registry>'s cached
code won't run 'C<use My::Utils;>' again (since it happens only once,
i.e. during the compile time). Therefore the script doesn't know that
the subroutine reference has been changed.
This is easy to verify. Let's change the script to be:
#file:test.pl
#------------
use My::Utils;
print "Content-type: text/plain\n\n";
my $sub_int = \&colour;
my $sub_ext = \&My::Utils::colour;
print "int $sub_int\n";
print "ext $sub_ext\n";
Issue a request, you will see something similar to:
int CODE(0x8510af8)
ext CODE(0x8510af8)
As you can see both point to the same CODE reference (meaning that
it's the same symbol). After modifying F<My/Utils.pm> again:
- sub colour { "red" }
+ sub colour { "blue" }
and calling the script on the secondnd time, we get:
int CODE(0x8510af8)
ext CODE(0x851112c)
You can see that the internal CODE reference is not the same as the
external one.
=head3 The Solution
There are two solutions to this problem:
Solution 1: replace C<use()> with an explicit C<require()> +
C<import()>.
- use My::Utils;
+ require My::Utils; My::Utils->import();
now the changed functions will be reimported on every request.
Solution 2: remember to touch the script itself every time you change
the module that it requires.
=head1 Threaded MPM and Multiple Perl Interpreters
If you use C<Apache2::Reload> with a threaded MPM and multiple Perl
interpreters, the modules will be reloaded by each interpreter as they
are used, not every interpreters at once. Similar to mod_perl 1.0
where each child has its own Perl interpreter, the modules are
reloaded as each child is hit with a request.
If a module is loaded at startup, the syntax tree of each subroutine
is shared between interpreters (big win), but each subroutine has its
own padlist (where lexical my variables are stored). Once
C<Apache2::Reload> reloads a module, this sharing goes away and each
Perl interpreter will have its own copy of the syntax tree for the
reloaded subroutines.
=head1 Pseudo-hashes
The short summary of this is: Don't use pseudo-hashes. They are
deprecated since Perl 5.8 and are removed in 5.9.
Use an array with constant indexes. Its faster in the general case,
its more guaranteed, and generally, it works.
The long summary is that some work has been done to get this module
working with modules that use pseudo-hashes, but it's still broken in
the case of a single module that contains multiple packages that all
use pseudo-hashes.
So don't do that.
=head1 Copyright
mod_perl 2.0 and its core modules are copyrighted under
The Apache Software License, Version 2.0.
=head1 Authors
Matt Sergeant, matt@sergeant.org
Stas Bekman (porting to mod_perl 2.0)
A few concepts borrowed from C<Stonehenge::Reload> by Randal Schwartz
and C<Apache::StatINC> (mod_perl 1.x) by Doug MacEachern and Ask
Bjoern Hansen.
=head1 MAINTAINERS
the mod_perl developers, dev@perl.apache.org
=cut
Apache-Reload/t/ 0000755 0000000 0000000 00000000000 12224342455 0013707 5 ustar 00root root 0000000 0000000 Apache-Reload/t/all.t 0000644 0000000 0000000 00000000157 12224342455 0014647 0 ustar 00root root 0000000 0000000 use strict;
use warnings FATAL => 'all';
use Apache::Test;
plan tests => 1, need_module('mod_perl.c');
ok(1); Apache-Reload/t/conf/ 0000755 0000000 0000000 00000000000 12224342455 0014634 5 ustar 00root root 0000000 0000000 Apache-Reload/t/conf/extra.last.conf.in 0000644 0000000 0000000 00000001134 12224342455 0020174 0 ustar 00root root 0000000 0000000 <IfModule mod_perl.c>
<IfDefine APACHE2>
PerlModule Apache2::Reload
PerlModule Apache2::TestReload
</IfDefine>
<IfDefine APACHE1>
PerlModule Apache::Reload
PerlModule Apache::TestReload
</IfDefine>
<Location /reload>
SetHandler perl-script
<IfDefine APACHE2>
PerlInitHandler Apache2::Reload
PerlResponseHandler Apache2::TestReload
</IfDefine>
<IfDefine APACHE1>
PerlInitHandler Apache::Reload
PerlHandler Apache::TestReload
</IfDefine>
</Location>
</IfModule>
Apache-Reload/t/lib/ 0000755 0000000 0000000 00000000000 12224342455 0014455 5 ustar 00root root 0000000 0000000 Apache-Reload/t/lib/Apache/ 0000755 0000000 0000000 00000000000 12224342455 0015636 5 ustar 00root root 0000000 0000000 Apache-Reload/t/lib/Apache/TestReload.pm 0000644 0000000 0000000 00000001436 12224342455 0020246 0 ustar 00root root 0000000 0000000 package Apache::TestReload;
use strict;
use warnings FATAL => 'all';
#use ModPerl::Util ();
use Apache::Constants qw(:common);
my $package = 'Reload::Test';
our $pass = 0;
sub handler {
my $r = shift;
$pass++;
$r->send_http_header('text/plain');
if ((defined ($r->args)) && ($r->args eq 'last')) {
#Apache2::Reload->unregister_module($package);
#ModPerl::Util::unload_package($package);
$pass = 0;
$r->print("unregistered OK");
return OK;
}
eval "require $package";
Reload::Test::run($r);
return OK;
}
# This one shouldn't be touched
package Reload::Test::SubPackage;
sub subpackage {
if ($Apache::TestReload::pass == '2') {
return 'SUBPACKAGE';
}
else {
return 'subpackage';
}
}
1;
Apache-Reload/t/lib/Apache2/ 0000755 0000000 0000000 00000000000 12224342455 0015720 5 ustar 00root root 0000000 0000000 Apache-Reload/t/lib/Apache2/TestReload.pm 0000644 0000000 0000000 00000001466 12224342455 0020333 0 ustar 00root root 0000000 0000000 package Apache2::TestReload;
use strict;
use warnings FATAL => 'all';
use ModPerl::Util ();
use Apache2::RequestRec ();
use Apache2::Const -compile => qw(OK);
use Apache2::RequestIO ();
my $package = 'Reload::Test';
our $pass = 0;
sub handler {
my $r = shift;
$pass++;
if ($r->args eq 'last') {
Apache2::Reload->unregister_module($package);
ModPerl::Util::unload_package($package);
$pass = 0;
$r->print("unregistered OK");
return Apache2::Const::OK;
}
eval "require $package";
Reload::Test::run($r);
return Apache2::Const::OK;
}
# This one shouldn't be touched
package Reload::Test::SubPackage;
sub subpackage {
if ($Apache2::TestReload::pass == '2') {
return 'SUBPACKAGE';
}
else {
return 'subpackage';
}
}
1;
Apache-Reload/t/reload.t 0000644 0000000 0000000 00000002731 12224342455 0015345 0 ustar 00root root 0000000 0000000 use strict;
use warnings FATAL => 'all';
use Apache::Test;
use Apache::TestUtil;
use Apache::TestRequest;
use File::Spec::Functions qw(catfile tmpdir);
Apache::TestRequest::user_agent(keep_alive => 1);
plan tests => 3, need 'HTML::HeadParser';
my $test_file = catfile qw(Reload Test.pm);
my $location = '/reload';
my @tests = qw(const prototype simple subpackage);
my $header = join '', <DATA>;
my $initial = <<'EOF';
sub simple { 'simple' }
use constant const => 'const';
sub prototype($) { 'prototype' }
sub promised;
EOF
my $modified = <<'EOF';
sub simple { 'SIMPLE' }
use constant const => 'CONST';
sub prototype($$) { 'PROTOTYPE' }
EOF
t_write_test_lib($test_file, $header, $initial);
{
my $expected = join '', map { "$_:$_\n" } sort @tests;
my $received = GET $location;
ok t_cmp($received->content, $expected, 'Initial');
}
t_write_test_lib($test_file, $header, $modified);
{
my $expected = join '', map { "$_:" . uc($_) . "\n" } sort @tests;
my $received = GET $location;
ok t_cmp($received->content, $expected, 'Reload');
}
{
my $expected = "unregistered OK";
my $received = GET "$location?last";
ok t_cmp($received->content, $expected, 'Unregister');
}
__DATA__
package Reload::Test;
our @methods = qw(const prototype simple subpackage);
sub subpackage { return Reload::Test::SubPackage::subpackage() }
sub run {
my $r = shift;
foreach my $m (sort @methods) {
$r->print($m, ':', __PACKAGE__->$m(), "\n");
}
}
1;