/usr/share/perl5/MMM/Monitor/Agents.pm is in mysql-mmm-monitor 2.2.1-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 | package MMM::Monitor::Agents;
use base 'Class::Singleton';
use strict;
use warnings FATAL => 'all';
use Log::Log4perl qw(:easy);
use IO::Handle;
use File::Temp;
use File::Basename;
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 = $main::config->{monitor}->{status_path};
my ($fh, $tempname) = File::Temp::tempfile(basename($filename) . ('X' x 10), UNLINK => 0, DIR => dirname($filename));
keys (%$self); # reset iterator
while (my ($host, $agent) = each(%$self)) {
next unless $agent;
printf($fh "%s|%s|%s\n", $host, $agent->state, join(',', sort(@{$agent->roles})));
}
IO::Handle::flush($fh);
IO::Handle::sync($fh);
close($fh);
rename($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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