oracular (3) Apache2::Status.3pm.gz
NAME
Apache2::Status - Embedded interpreter status information
Synopsis
<Location /perl-status>
# disallow public access
Order Deny, Allow
Deny from all
Allow from 127.0.0.1
SetHandler modperl
PerlOptions +GlobalRequest
PerlResponseHandler Apache2::Status
</Location>
or
<Location /perl-status>
# disallow public access
Order Deny, Allow
Deny from all
Allow from 127.0.0.1
SetHandler perl-script
PerlResponseHandler Apache2::Status
</Location>
Description
The "Apache2::Status" module provides some information about the status of the Perl interpreter embedded
in the server.
Configure like so:
<Location /perl-status>
# disallow public access
Order Deny, Allow
Deny from all
Allow from 127.0.0.1
SetHandler modperl
PerlOptions +GlobalRequest
PerlResponseHandler Apache2::Status
</Location>
Notice that under the "modperl" core handler the Environment menu option will show only the environment
under that handler. To see the environment seen by handlers running under the "perl-script" core handler,
configure "Apache2::Status" as:
<Location /perl-status>
# disallow public access
Order Deny, Allow
Deny from all
Allow from 127.0.0.1
SetHandler perl-script
PerlResponseHandler Apache2::Status
</Location>
Other modules can "plugin" a menu item like so:
require Apache2::Module;
Apache2::Status->menu_item(
'DBI' => "DBI connections", #item for Apache::DBI module
sub {
my ($r, $q) = @_; #request and CGI objects
my (@strings);
push @strings, "blobs of html";
return \@strings; #return an array ref
}
) if Apache2::Module::loaded('Apache2::Status');
WARNING: "Apache2::Status" must be loaded before these modules via the "PerlModule" or "PerlRequire"
directives (or from startup.pl).
A very common setup might be:
Perl Module B::TerseSize
<Location /perl-status>
SetHandler perl-script
PerlResponseHandler Apache2::Status
PerlSetVar StatusOptionsAll On
PerlSetVar StatusDeparseOptions "-p -sC"
</Location>
due to the implementation of Apache2::Status::noh_fileline in B::TerseSize, you must load B::TerseSize
first.
Options
"StatusOptionsAll"
This single directive will enable all of the options described below.
PerlSetVar StatusOptionsAll On
"StatusDumper"
When browsing symbol tables, the values of arrays, hashes and scalars can be viewed via "Data::Dumper" if
this configuration variable is set to "On":
PerlSetVar StatusDumper On
"StatusPeek"
With this option "On" and the "Apache::Peek" module installed, functions and variables can be viewed ala
"Devel::Peek" style:
PerlSetVar StatusPeek On
"StatusLexInfo"
With this option "On" and the "B::LexInfo" module installed, subroutine lexical variable information can
be viewed.
PerlSetVar StatusLexInfo On
"StatusDeparse"
With this option "On" subroutines can be "deparsed".
PerlSetVar StatusDeparse On
Options can be passed to "B::Deparse::new" like so:
PerlSetVar StatusDeparseOptions "-p -sC"
See the "B::Deparse" manpage for details.
"StatusTerse"
With this option "On", text-based op tree graphs of subroutines can be displayed, thanks to "B::Terse".
PerlSetVar StatusTerse On
"StatusTerseSize"
With this option "On" and the "B::TerseSize" module installed, text-based op tree graphs of subroutines
and their size can be displayed. See the "B::TerseSize" docs for more info.
PerlSetVar StatusTerseSize On
"StatusTerseSizeMainSummary"
With this option "On" and the "B::TerseSize" module installed, a "Memory Usage" will be added to the
"Apache2::Status" main menu. This option is disabled by default, as it can be rather cpu intensive to
summarize memory usage for the entire server. It is strongly suggested that this option only be used
with a development server running in "-X" mode, as the results will be cached.
PerlSetVar StatusTerseSizeMainSummary On
"StatusGraph"
When "StatusDumper" is enabled, another link "OP Tree Graph" will be present with the dump if this
configuration variable is set to "On":
PerlSetVar StatusGraph
This requires the B module (part of the Perl compiler kit) and "B::Graph" (version 0.03 or higher) module
to be installed along with the "dot" program.
Dot is part of the graph visualization toolkit from AT&T: http://www.graphviz.org/.
WARNING: Some graphs may produce very large images, some graphs may produce no image if "B::Graph"'s
output is incorrect.
"Dot"
Location of the dot program for "StatusGraph", if other than /usr/bin or /usr/local/bin
"GraphDir"
Directory where "StatusGraph" should write it's temporary image files. Default is
"$ServerRoot/logs/b_graphs".
Prerequisites
The "Devel::Symdump" module, version 2.00 or higher.
Other optional functionality requirements: "B::Deparse" - 0.59, "B::Fathom" - 0.05, ""B::Graph"" - 0.03.
Copyright
mod_perl 2.0 and its core modules are copyrighted under The Apache Software License, Version 2.0.
See Also
perl(1), Apache(3), Devel::Symdump(3), Data::Dumper(3), B(3), "B::Graph"(3), mod_perl 2.0 documentation.
Authors
Doug MacEachern with contributions from Stas Bekman perl v5.38.2 2libapache2-mod-perl2-2.0.13::docs::api::Apache2::Status(3pm)