NAME

Monitoring::Livestatus - Perl API for check_mk livestatus to access runtime data from Nagios and Icinga

SYNOPSIS

use Monitoring::Livestatus;
my $ml = Monitoring::Livestatus->new(
  socket => '/var/lib/livestatus/livestatus.sock'
);
my $hosts = $ml->selectall_arrayref("GET hosts");

DESCRIPTION

This module connects via socket/tcp to the livestatus addon for Naemon, Nagios, Icinga and Shinken. You first have to install and activate the livestatus addon in your monitoring installation.

CONSTRUCTOR

new ( [ARGS] )

Creates an Monitoring::Livestatus object. new takes at least the socketpath. Arguments are in key-value pairs.

socket: path to the UNIX socket of check_mk livestatus
server: server address when using a TCP connection
peer: alternative way to set socket or server, if value contains ':' server is used, else socket
name: human readable name for this connection, defaults to the the socket/server address
verbose: verbose mode
line_separator: ascii code of the line separator, defaults to 10, (newline)
column_separator: ascii code of the column separator, defaults to 0 (null byte)
list_separator: ascii code of the list separator, defaults to 44 (comma)
host_service_separator: ascii code of the host/service separator, defaults to 124 (pipe)
keepalive: enable keepalive. Default is off
errors_are_fatal: errors will die with an error message. Default: on
warnings: show warnings currently only querys without Columns: Header will result in a warning
timeout: set a general timeout. Used for connect and querys, no default
query_timeout: set a query timeout. Used for retrieving querys, Default 60sec
connect_timeout: set a connect timeout. Used for initial connections, default 5sec

If the constructor is only passed a single argument, it is assumed to be a the peer specification. Use either socker OR server.

METHODS

do

do($statement)
do($statement, %opts)

Send a single statement without fetching the result. Always returns true.

selectall_arrayref

selectall_arrayref($statement)
selectall_arrayref($statement, %opts)
selectall_arrayref($statement, %opts, $limit )

Sends a query and returns an array reference of arrays

my $arr_refs = $ml->selectall_arrayref("GET hosts");

to get an array of hash references do something like

my $hash_refs = $ml->selectall_arrayref(
  "GET hosts", { Slice => {} }
);

to get an array of hash references from the first 2 returned rows only

my $hash_refs = $ml->selectall_arrayref(
  "GET hosts", { Slice => {} }, 2
);

you may use limit to limit the result to this number of rows

column aliases can be defined with a rename hash

my $hash_refs = $ml->selectall_arrayref(
  "GET hosts", {
    Slice => {},
    rename => {
      'name' => 'host_name'
    }
  }
);

selectall_hashref

selectall_hashref($statement, $key_field)
selectall_hashref($statement, $key_field, %opts)

Sends a query and returns a hashref with the given key

my $hashrefs = $ml->selectall_hashref("GET hosts", "name");

selectcol_arrayref

selectcol_arrayref($statement)
selectcol_arrayref($statement, %opt )

Sends a query an returns an arrayref for the first columns

my $array_ref = $ml->selectcol_arrayref("GET hosts\nColumns: name");

$VAR1 = [
          'localhost',
          'gateway',
        ];

returns an empty array if nothing was found

to get a different column use this

   my $array_ref = $ml->selectcol_arrayref(
      "GET hosts\nColumns: name contacts",
      { Columns => [2] }
   );

you can link 2 columns in a hash result set

   my %hash = @{
     $ml->selectcol_arrayref(
       "GET hosts\nColumns: name contacts",
       { Columns => [1,2] }
     )
   };

produces a hash with host the contact assosiation

$VAR1 = {
          'localhost' => 'user1',
          'gateway'   => 'user2'
        };

selectrow_array

selectrow_array($statement)
selectrow_array($statement, %opts)

Sends a query and returns an array for the first row

my @array = $ml->selectrow_array("GET hosts");

returns undef if nothing was found

selectrow_arrayref

selectrow_arrayref($statement)
selectrow_arrayref($statement, %opts)

Sends a query and returns an array reference for the first row

my $arrayref = $ml->selectrow_arrayref("GET hosts");

returns undef if nothing was found

selectrow_hashref

selectrow_hashref($statement)
selectrow_hashref($statement, %opt)

Sends a query and returns a hash reference for the first row

my $hashref = $ml->selectrow_hashref("GET hosts");

returns undef if nothing was found

selectscalar_value

selectscalar_value($statement)
selectscalar_value($statement, %opt)

Sends a query and returns a single scalar

my $count = $ml->selectscalar_value("GET hosts\nStats: state = 0");

returns undef if nothing was found

errors_are_fatal

errors_are_fatal()
errors_are_fatal($value)

Enable or disable fatal errors. When enabled the module will confess on any error.

returns the current setting if called without new value

warnings

warnings()
warnings($value)

Enable or disable warnings. When enabled the module will carp on warnings.

returns the current setting if called without new value

verbose

verbose()
verbose($values)

Enable or disable verbose output. When enabled the module will dump out debug output

returns the current setting if called without new value

peer_addr

$ml->peer_addr()

returns the current peer address

when using multiple backends, a list of all addresses is returned in list context

peer_name

$ml->peer_name()
$ml->peer_name($string)

if new value is set, name is set to this value

always returns the current peer name

when using multiple backends, a list of all names is returned in list context

peer_key

$ml->peer_key()

returns a uniq key for this peer

post_processing

$ml->post_processing($result, $options, $keys)

returns postprocessed result.

Useful when using select based io.

QUERY OPTIONS

In addition to the normal query syntax from the livestatus addon, it is possible to set column aliases in various ways.

AddPeer

adds the peers name, addr and key to the result set:

my $hosts = $ml->selectall_hashref(
  "GET hosts\nColumns: name alias state",
  "name",
  { AddPeer => 1 }
);

Backend

send the query only to some specific backends. Only useful when using multiple backends.

my $hosts = $ml->selectall_arrayref(
  "GET hosts\nColumns: name alias state",
  { Backends => [ 'key1', 'key4' ] }
);

Columns

  only return the given column indexes

  my $array_ref = $ml->selectcol_arrayref(
     "GET hosts\nColumns: name contacts",
     { Columns => [2] }
  );

see L<selectcol_arrayref> for more examples

Deepcopy

deep copy/clone the result set.

Only effective when using multiple backends and threads.
This can be safely turned off if you don't change the
result set.
If you get an error like "Invalid value for shared scalar" error" this
should be turned on.

my $array_ref = $ml->selectcol_arrayref(
   "GET hosts\nColumns: name contacts",
   { Deepcopy => 1 }
);

Limit

Just like the Limit: <nr> option from livestatus itself.
In addition you can add a start,length limit.

my $array_ref = $ml->selectcol_arrayref(
   "GET hosts\nColumns: name contacts",
   { Limit => "10,20" }
);

This example will return 20 rows starting at row 10. You will
get row 10-30.

Cannot be combined with a Limit inside the query
because a Limit will be added automatically.

Adding a limit this way will greatly increase performance and
reduce memory usage.

This option is multibackend safe contrary to the "Limit: " part of a statement.
Sending a statement like "GET...Limit: 10" with 3 backends will result in 30 rows.
Using this options, you will receive only the first 10 rows.

Rename

see L<COLUMN ALIAS> for detailed explainaton

Slice

see L<selectall_arrayref> for detailed explainaton

Sum

The Sum option only applies when using multiple backends. The values from all backends with be summed up to a total.

my $stats = $ml->selectrow_hashref(
  "GET hosts\nStats: state = 0\nStats: state = 1",
  { Sum => 1 }
);

COLUMN ALIAS

In addition to the normal query syntax from the livestatus addon, it is possible to set column aliases in various ways.

A valid Columns: Header could look like this:

my $hosts = $ml->selectall_arrayref(
  "GET hosts\nColumns: state as status"
);

Stats queries could be aliased too:

my $stats = $ml->selectall_arrayref(
  "GET hosts\nStats: state = 0 as up"
);

This syntax is available for: Stats, StatsAnd, StatsOr and StatsGroupBy

An alternative way to set column aliases is to define rename option key/value pairs:

my $hosts = $ml->selectall_arrayref(
  "GET hosts\nColumns: name", {
    rename => { 'name' => 'hostname' }
  }
);

extract_keys_from_stats_statement

extract_keys_from_stats_statement($statement)

Extract column keys from statement.

ERROR HANDLING

Errorhandling can be done like this:

use Monitoring::Livestatus;
my $ml = Monitoring::Livestatus->new(
  socket => '/var/lib/livestatus/livestatus.sock'
);
$ml->errors_are_fatal(0);
my $hosts = $ml->selectall_arrayref("GET hosts");
if($Monitoring::Livestatus::ErrorCode) {
    confess($Monitoring::Livestatus::ErrorMessage);
}

AUTHOR

Sven Nierlein, 2009-present, <sven@nierlein.org>

COPYRIGHT AND LICENSE

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

NAME

SYNOPSIS

DESCRIPTION

CONSTRUCTOR

new ( [ARGS] )

METHODS

do

selectall_arrayref

selectall_hashref

selectcol_arrayref

selectrow_array

selectrow_arrayref

selectrow_hashref

selectscalar_value

errors_are_fatal

warnings

verbose

peer_addr

peer_name

peer_key

post_processing

QUERY OPTIONS

AddPeer

Backend

Columns

Deepcopy

Limit

Rename

Slice

Sum

COLUMN ALIAS

extract_keys_from_stats_statement

ERROR HANDLING

SEE ALSO

AUTHOR

COPYRIGHT AND LICENSE