Nagios::Object

This module contains the code for creating perl objects to represent any of the Nagios objects. All of the perl classes are auto-generated at compile-time, so it's pretty trivial to add new attributes or even entire objects. The following is a list of currently supported classes:

 Nagios::TimePeriod
 Nagios::Command
 Nagios::Contact
 Nagios::ContactGroup
 Nagios::Host
 Nagios::Service
 Nagios::HostGroup
 Nagios::ServiceEscalation
 Nagios::HostDependency
 Nagios::HostEscalation
 Nagios::HostGroupEscalation
 Nagios::ServiceDependency
 -- next two are for status.dat in Nagios 2.x
 Nagios::Info
 Nagios::Program

 use Nagios::Object;
 my $generic_host = Nagios::Host->new(
    register                     => 0,
    parents                      => undef,
    check_command                => $some_command,
    max_check_attempts           => 3,
    checks_enabled               => 1,
    event_handler                => $some_command,
    event_handler_enabled        => 0,
    low_flap_threshold          => 0,
    high_flap_threshold         => 0,
    flap_detection_enabled       => 0,
    process_perf_data            => 1,
    retain_status_information    => 1,
    retain_nonstatus_information => 1,
    notification_interval        => $timeperiod,
    notification_options         => [qw(d u r)],
    notifications_enabled        => 1,
    stalking_options             => [qw(o d u)]
 );
 # this will automatically 'use' $generic_host
 my $localhost = $generic_host->new(
    host_name => "localhost",
    alias     => "Loopback",
    address   => "127.0.0.1"
 );
 my $hostname = $localhost->host_name();
 printf "max check attempts for $hostname is %s.\n",
     $localhost->max_check_attempts;
 
 $localhost->set_event_handler(
     Nagios::Command->new(
         command_name => "new_event_handler",
         command_line => "/bin/true"
     )
 );

new()

Create a new object of one of the types listed above.

Calling new() on an existing object will use the LHS object as the template for the object being created. This is mainly useful for creating objects without involving Nagios::Object::Config (like in the test suite).

 Nagios::Host->new( ... );
    

dump()

Output a Nagios define { } block from an object. This is still EXPERIMENTAL, but may eventually be robust enough to use for a configuration GUI. Passing in a single true argument will tell it to flatten the object inheritance on dump.

 print $object->dump();
 print $object->dump(1); # flatten
    

name()

This method is common to all classes created by this module. It should always return the textual name for an object. It is used internally by the Nagios::Object modules to allow polymorphism (which is what makes this module so compact). This is the only way to retrieve the name of a template, since they are identified by their "name" field.

 my $svc_desc = $service->name;
 my $hostname = $host->name;
    

Which is just short for:

 my $svc_desc = $service->service_description;
 my $hostname = $service->host_name;
    

register()

Returns true/undef to indicate whether the calling object is registerable or not.

 if ( $object->register ) { print $object->name, " is registerable." }
    

has_attribute()

Returns true/undef to indicate whether the calling object has the attribute specified as the only argument.

 # check to see if $object has attribute "command_line"
 die if ( !$object->has_attribute("command_line") );
    

list_attributes()

Returns a list of valid attributes for the calling object.

 my @host_attributes = $host->list_attributes();
    

attribute_type()

Returns the type of data expected by the object's set_ method for the given attribute. For some fields like notification_options, it may return "char_flag."

For "name" attributes, it will simply return whatever %setup_data contains.

This method needs some TLC ...

 my $type = $host->attribute_type("notification_period");
    

attribute_is_list()

Returns true if the attribute is supposed to be a list (ARRAYREF).

 if ( $object->attribute_is_list("members") ) {
    $object->set_members( [$member] );
 } else {
    $object->set_members( $member );
 }
    

Al Tobey <tobeya@cpan.org>

Thank you to the fine people of #perl on freenode.net for helping me with some hairy code and silly optimizations.

See AUTHOR.