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lib/ASNMTAP/Asnmtap/Plugins/NPTest.pm  view on Meta::CPAN

package ASNMTAP::Asnmtap::Plugins::NPTest;

#
# Helper Functions for testing Nagios Plugins
#

require Exporter;
@ISA       = qw(Exporter);
@EXPORT    = qw(getTestParameter checkCmd skipMissingCmd);
@EXPORT_OK = qw(DetermineTestHarnessDirectory TestsFrom SetCacheFilename);

use strict;
use warnings;

use Cwd;
use File::Basename;

use IO::File;
use Data::Dumper;

use Test;

use vars qw($VERSION);
$VERSION = do { my @r = (q$Revision: 1.13 $ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r }; # must be all one line, for MakeMaker

=head1 NAME

NPTest - Simplify the testing of Nagios Plugins

=head1 DESCRIPTION

This modules provides convenience functions to assist in the testing
of Nagios Plugins, making the testing code easier to read and write;
hopefully encouraging the development of a more complete test suite for
the Nagios Plugins. It is based on the patterns of testing seen in the
1.4.0 release, and continues to use the L<Test> module as the basis of
testing.

=head1 FUNCTIONS

This module defines three public functions, C<getTestParameter(...)>,
C<checkCmd(...)> and C<skipMissingCmd(...)>.  These are exported by
default via the C<use NPTest;> statement.

=over

=item getTestParameter( "ENV_VARIABLE", $brief_description, $default )

$default is optional.

This function allows the test harness
developer to interactively request test parameter information from the
user. The user can accept the developer's default value or reply "none"
which will then be returned as "" for the test to skip if appropriate.

If a parameter needs to be entered and the test is run without a tty 
attached (such as a cronjob), the parameter will be assigned as if it 
was "none". Tests can check for the parameter and skip if not set.

Responses are stored in an external, file-based
cache so subsequent test runs will use these values. The user is able
to change the values by amending the values in the file /var/tmp/NPTest.pm,
or by setting the appropriate environment variable before running the test.

The option exists to store parameters in a scoped means, allowing a
test harness to a localise a parameter should the need arise. This
allows a parameter of the same name to exist in a test harness
specific scope, while not affecting the globally scoped parameter. The
scoping identifier is the name of the test harness sans the trailing
".t".  All cache searches first look to a scoped parameter before
looking for the parameter at global scope. Thus for a test harness
called "check_disk.t" requesting the parameter "mountpoint_valid", the
cache is first searched for "check_disk"/"mountpoint_valid", if this
fails, then a search is conducted for "mountpoint_valid".

To facilitate quick testing setup, it is possible to accept all the
developer provided defaults by setting the environment variable
"NPTEST_ACCEPTDEFAULT" to "1" (or any other perl truth value). Note
that, such defaults are not stored in the cache, as there is currently
no mechanism to edit existing cache entries, save the use of text
editor or removing the cache file completely.

=item C<testCmd($command)>

Call with ASNMTAP::Asnmtap::Plugins::NPTest->testCmd("./check_disk ...."). This returns a NPTest object
which you can then run $object->return_code or $object->output against.

Testing of results would be done in your test script, not in this module.

=item C<checkCmd(...)>

This function is obsolete. Use C<testCmd()> instead.

This function attempts to encompass the majority of test styles used
in testing Nagios Plugins. As each plug-in is a separate command, the
typical tests we wish to perform are against the exit status of the
command and the output (if any) it generated. Simplifying these tests
into a single function call, makes the test harness easier to read and
maintain and allows additional functionality (such as debugging) to be
provided without additional effort on the part of the test harness
developer.

It is possible to enable debugging via the environment variable
C<NPTEST_DEBUG>. If this environment variable exists and its value in PERL's
boolean context evaluates to true, debugging is enabled.

The function prototype can be expressed as follows:

  Parameter 1 : command => DEFINED SCALAR(string)
  Parameter 2 : desiredExitStatus => ONE OF
                  SCALAR(integer)
                  ARRAYREF(integer)
                  HASHREF(integer,string)
                  UNDEFINED
  Parameter 3 : desiredOutput => SCALAR(string) OR UNDEFINED
  Parameter 4 : exceptions => HASH(integer,string) OR UNDEFINED
  Returns     : SCALAR(integer) as defined by Test::ok(...)

lib/ASNMTAP/Asnmtap/Plugins/NPTest.pm  view on Meta::CPAN

  return $testStatus;
}


sub skipMissingCmd
{
  my( $command, $count ) = @_;

  my $testStatus;

  for ( 1 .. $count )
  {
    $testStatus += skip( "Missing ${command} - tests skipped", 1 );
  }

  return $testStatus;
}

sub getTestParameter
{
  my( $param, $envvar, $default, $brief, $scoped );
  my $new_style;
  if (scalar @_ <= 3) {
	($param, $brief, $default) = @_;
	$envvar = $param;
	$new_style = 1;
  } else {
	( $param, $envvar, $default, $brief, $scoped ) = @_;
	$new_style = 0;
  }

  # Apply default values for optional arguments
  $scoped = ( defined( $scoped ) && $scoped );

  my $testharness = basename( (caller(0))[1], ".t" ); # used for scoping

  if ( defined( $envvar ) &&  exists( $ENV{$envvar} ) && $ENV{$envvar} )
  {
    return $ENV{$envvar};
  }

  my $cachedValue = SearchCache( $param, $testharness );
  if ( defined( $cachedValue ) )
  {
    # This save required to convert to new style because the key required is
    # changing to the environment variable
    if ($new_style == 0) {
      SetCacheParameter( $envvar, undef, $cachedValue );
    }
    return $cachedValue;
  }

  my $defaultValid      = ( defined( $default ) && $default );
  my $autoAcceptDefault = ( exists( $ENV{'NPTEST_ACCEPTDEFAULT'} ) && $ENV{'NPTEST_ACCEPTDEFAULT'} );

  if ( $autoAcceptDefault && $defaultValid )
  {
    return $default;
  }

  # Set "none" if no terminal attached (eg, tinderbox build servers when new variables set)
  return "" unless (-t STDERR);

  my $userResponse = '';

  while ( $userResponse eq '' )
  {
    print STDERR "\n";
    print STDERR "Test Harness         : $testharness\n";
    print STDERR "Test Parameter       : $param\n";
    print STDERR "Environment Variable : $envvar\n" if ($param ne $envvar);
    print STDERR "Brief Description    : $brief\n";
    print STDERR "Enter value (or 'none') ", ($defaultValid ? "[${default}]" : "[]"), " => ";
    $userResponse = <STDIN>;
    $userResponse = "" if ! defined( $userResponse ); # Handle EOF
    chomp( $userResponse );
    if ( $defaultValid && $userResponse eq '' )
    {
      $userResponse = $default;
    }
  }

  print STDERR "\n";

  if ($userResponse =~ /^(na|none)$/) {
	$userResponse = '';
  }

  # define all user responses at global scope
  SetCacheParameter( $param, ( $scoped ? $testharness : undef ), $userResponse );

  return $userResponse;
}

#
# Internal Cache Management Functions
#

sub SearchCache
{
  my( $param, $scope ) = @_;

  LoadCache();

  if ( exists( $CACHE{$scope} ) && exists( $CACHE{$scope}{$param} ) )
  {
    return $CACHE{$scope}{$param};
  }

  if ( exists( $CACHE{$param} ) )
  {
    return $CACHE{$param};
  }
  return undef;	# Need this to say "nothing found"
}

sub SetCacheParameter
{
  my( $param, $scope, $value ) = @_;

  if ( defined( $scope ) )