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package MMM::Monitor::Agents;
use base 'Class::Singleton';
use strict;
use warnings FATAL => 'all';
use Log::Log4perl qw(:easy);
use IO::Handle;
use MMM::Monitor::Agent;
use MMM::Monitor::Role;
=head1 NAME
MMM::Monitor::Agents - single instance class holding status information for all agent hosts
=head1 SYNOPSIS
# Get the instance
my $agents = MMM::Monitor::Agents->instance();
=cut
sub _new_instance($) {
my $class = shift;
my $data = {};
my @hosts = keys(%{$main::config->{host}});
foreach my $host (@hosts) {
$data->{$host} = new MMM::Monitor::Agent:: (
host => $host,
mode => $main::config->{host}->{$host}->{mode},
ip => $main::config->{host}->{$host}->{ip},
port => $main::config->{host}->{$host}->{agent_port},
state => 'UNKNOWN',
roles => [],
uptime => 0,
last_uptime => 0
);
}
return bless $data, $class;
}
=head1 FUNCTIONS
=over 4
=item exists($host)
Check if host $host exists.
=cut
sub exists($$) {
my $self = shift;
my $host = shift;
return defined($self->{$host});
}
=item get($host)
Get agent for host $host.
=cut
sub get($$) {
my $self = shift;
my $host = shift;
return $self->{$host};
}
=item state($host)
Get state of host $host.
=cut
sub state($$) {
my $self = shift;
my $host = shift;
LOGDIE "Can't get state of invalid host '$host'" if (!defined($self->{$host}));
return $self->{$host}->state;
}
=item online_since($host)
Get time since host $host is online.
=cut
sub online_since($$) {
my $self = shift;
my $host = shift;
LOGDIE "Can't get time since invalid host '$host' is online" if (!defined($self->{$host}));
return $self->{$host}->online_since;
}
=item set_state($host, $state)
Set state of host $host to $state.
=cut
sub set_state($$$) {
my $self = shift;
my $host = shift;
my $state = shift;
LOGDIE "Can't set state of invalid host '$host'" if (!defined($self->{$host}));
$self->{$host}->state($state);
}
=item get_status_info
Get string containing status information.
=cut
sub get_status_info($) {
my $self = shift;
my $detailed= shift || 0;
my $res = '';
my $agent_res = '';
keys (%$self); # reset iterator
foreach my $host (sort(keys(%$self))) {
my $agent = $self->{$host};
next unless $agent;
$agent_res .= "# Warning: agent on host $host is not reachable\n" if ($agent->agent_down());
$res .= sprintf(" %s(%s) %s/%s. Roles: %s\n", $host, $agent->ip, $agent->mode, $agent->state, join(', ', sort(@{$agent->roles})));
}
$res = $agent_res . $res if ($detailed);
return $res;
}
=item save_status
Save status information into status file.
=cut
sub save_status($) {
my $self = shift;
my $filename = $main::config->{monitor}->{status_path};
# TODO maybe it's safer to use File::Temp::tempfile()
my $tempname = $filename . '.tmp';
open(STATUS, '>', $tempname) || LOGDIE "Can't open temporary status file '$tempname' for writing!";
keys (%$self); # reset iterator
while (my ($host, $agent) = each(%$self)) {
next unless $agent;
printf(STATUS "%s|%s|%s\n", $host, $agent->state, join(',', sort(@{$agent->roles})));
}
IO::Handle::flush(*STATUS);
IO::Handle::sync(*STATUS);
close(STATUS);
rename($tempname, $filename) || LOGDIE "Can't savely overwrite status file '$filename'!";
return;
}
=item load_status
Load status information from status file
=cut
sub load_status($) {
my $self = shift;
my $filename = $main::config->{monitor}->{status_path};
# Open status file
unless (open(STATUS, '<', $filename)) {
FATAL "Couldn't open status file '$filename': Starting up without status information.";
return;
}
while (my $line = <STATUS>) {
chomp($line);
my ($host, $state, $roles) = split(/\|/, $line);
unless (defined($self->{$host})) {
WARN "Ignoring saved status information for unknown host '$host'";
next;
}
# Parse roles
my @saved_roles_str = sort(split(/\,/, $roles));
my @saved_roles = ();
foreach my $role_str (@saved_roles_str) {
my $role = MMM::Monitor::Role->from_string($role_str);
push (@saved_roles, $role) if defined($role);
}
$self->{$host}->state($state);
$self->{$host}->roles(\@saved_roles);
}
close(STATUS);
return;
}
1;
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