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