/usr/share/perl5/MMM/Monitor/Roles.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.
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use base 'Class::Singleton';
use strict;
use warnings FATAL => 'all';
use Log::Log4perl qw(:easy);
use MMM::Monitor::Agents;
use MMM::Monitor::Role;
our $VERSION = '0.01';
=head1 NAME
MMM::Monitor::Roles - holds information for all roles
=cut
sub _new_instance($) {
my $class = shift;
my $self = {};
# create list of roles - each role will be orphaned by default
foreach my $role (keys(%{$main::config->{role}})) {
my $role_info = $main::config->{role}->{$role};
my $ips = {};
foreach my $ip (@{$role_info->{ips}}) {
$ips->{$ip} = { 'assigned_to' => '' }
}
$self->{$role} = {
mode => $role_info->{mode},
hosts => $role_info->{hosts},
ips => $ips
};
if ($role_info->{mode} eq 'exclusive' && $role_info->{prefer}) {
$self->{$role}->{prefer} = $role_info->{prefer};
}
}
return bless $self, $class;
}
=head1 FUNCTIONS
=over 4
=item assign($role, $host)
Assign role $role to host $host
=cut
sub assign($$$) {
my $self = shift;
my $role = shift;
my $host = shift;
LOGDIE "Can't assign role '$role' - no host given" unless (defined($host));
# Check if the ip is still configured for this role
unless (defined($self->{$role->name}->{ips}->{$role->ip})) {
WARN sprintf("Detected configuration change: ip '%s' was removed from role '%s'", $role->ip, $role->name);
return;
}
INFO sprintf("Adding role '%s' with ip '%s' to host '%s'", $role->name, $role->ip, $host);
$self->{$role->name}->{ips}->{$role->ip}->{assigned_to} = $host;
}
=item get_role_hosts($role)
Get all hosts which may handle role $role
=cut
sub get_role_hosts($$) {
my $self = shift;
my $role = shift;
return () unless (defined($role));
my $role_info = $self->{$role};
return () unless $role_info;
return @{$role_info->{hosts}};
}
=item get_host_roles($host)
Get all roles assigned to host $host
=cut
sub get_host_roles($$) {
my $self = shift;
my $host = shift;
return () unless (defined($host));
my @roles = ();
foreach my $role (keys(%$self)) {
my $role_info = $self->{$role};
foreach my $ip (keys(%{$role_info->{ips}})) {
my $ip_info = $role_info->{ips}->{$ip};
next unless ($ip_info->{assigned_to} eq $host);
push(@roles, new MMM::Monitor::Role::(name => $role, ip => $ip));
}
}
return @roles;
}
=item host_has_roles($host)
Check whether there are roles assigned to host $host
=cut
sub host_has_roles($$) {
my $self = shift;
my $host = shift;
return 0 unless (defined($host));
foreach my $role (keys(%$self)) {
my $role_info = $self->{$role};
foreach my $ip (keys(%{$role_info->{ips}})) {
my $ip_info = $role_info->{ips}->{$ip};
return 1 if ($ip_info->{assigned_to} eq $host);
}
}
return 0;
}
=item count_host_roles($host)
Count all roles assigned to host $host
=cut
sub count_host_roles($$) {
my $self = shift;
my $host = shift;
return 0 unless (defined($host));
my $cnt = 0;
foreach my $role (keys(%$self)) {
my $role_info = $self->{$role};
foreach my $ip (keys(%{$role_info->{ips}})) {
my $ip_info = $role_info->{ips}->{$ip};
next if ($ip_info->{assigned_to} ne $host);
$cnt++;
$cnt -= 0.5 if ($role eq $main::config->{active_master_role});
}
}
return $cnt;
}
=item get_active_master
Get the host with the active master-role
=cut
sub get_active_master($) {
my $self = shift;
my $role = $self->{$main::config->{active_master_role}};
return '' unless $role;
my @ips = keys( %{ $role->{ips} } );
return $role->{ips}->{$ips[0]}->{assigned_to};
}
=item get_passive_master
Get the passive master
=cut
sub get_passive_master($) {
my $self = shift;
my $role = $self->{$main::config->{active_master_role}};
my $active_master = $self->get_active_master();
return '' unless $role;
return '' unless $active_master;
foreach my $host ( @{ $role->{hosts} } ) {
return $host if ($host ne $active_master);
}
return '';
}
=item get_first_master
Get the first master
=cut
sub get_first_master($) {
my $self = shift;
my $role = $self->{$main::config->{active_master_role}};
return '' unless $role;
return '' unless $role->{hosts}[0];
return $role->{hosts}[0];
}
=item get_second_master
Get the second master
=cut
sub get_second_master($) {
my $self = shift;
my $role = $self->{$main::config->{active_master_role}};
return '' unless $role;
return '' unless $role->{hosts}[1];
return $role->{hosts}[1];
}
=item get_master_hosts
Get the hosts which can handle the active master-role
=cut
sub get_master_hosts($) {
my $self = shift;
my $role = $self->{$main::config->{active_master_role}};
return '' unless $role;
return $self->{$role}->{hosts};
}
=item get_exclusive_role_owner($role)
Get the host which has the exclusive role $role assigned
=cut
sub get_exclusive_role_owner($$) {
my $self = shift;
my $role = shift;
my $role_info = $self->{$role};
return '' unless $role_info;
my @ips = keys( %{ $role_info->{ips} } );
return $role_info->{ips}->{$ips[0]}->{assigned_to};
}
=item get_exclusive_role_ip($role)
Get the ip of an exclusive role $role
=cut
sub get_exclusive_role_ip($$) {
my $self = shift;
my $role = shift;
my $role_info = $self->{$role};
return undef unless $role_info;
my @ips = keys( %{ $role_info->{ips} } );
return $ips[0];
}
=item assigned_to_preferred_host($role)
Check if role is assigned to preferred host
=cut
sub assigned_to_preferred_host($$) {
my $self = shift;
my $role = shift;
my $role_info = $self->{$role};
return undef unless $role_info;
return undef unless ($role_info->{prefer});
my @ips = keys( %{ $role_info->{ips} } );
return ($role_info->{ips}->{$ips[0]}->{assigned_to} eq $role_info->{prefer});
}
=item clear_roles($host)
Remove all roles from host $host.
=cut
sub clear_roles($$) {
my $self = shift;
my $host = shift;
INFO "Removing all roles from host '$host':";
my $orphaned_master_role = 0;
foreach my $role (keys(%$self)) {
my $role_info = $self->{$role};
foreach my $ip (keys(%{$role_info->{ips}})) {
my $ip_info = $role_info->{ips}->{$ip};
next unless ($ip_info->{assigned_to} eq $host);
INFO " Removed role '$role($ip)' from host '$host'";
$ip_info->{assigned_to} = '';
$orphaned_master_role = 1 if ($role eq $main::config->{active_master_role});
}
}
return $orphaned_master_role;
}
=item clear_balanced_role($host, $role)
Remove balanced role $role from host $host.
=cut
sub clear_balanced_role($$$) {
my $self = shift;
my $host = shift;
my $role = shift;
INFO "Removing balanced role $role from host '$host':";
my $role_info = $self->{$role};
return 0 unless $role_info;
my $cnt = 0;
next unless ($role_info->{mode} eq 'balanced');
foreach my $ip (keys(%{$role_info->{ips}})) {
my $ip_info = $role_info->{ips}->{$ip};
next unless ($ip_info->{assigned_to} eq $host);
$cnt++;
INFO " Removed role '$role($ip)' from host '$host'";
$ip_info->{assigned_to} = '';
}
return $cnt;
}
=item find_eligible_host($role)
find host which can take over the role $role
=cut
sub find_eligible_host($$) {
my $self = shift;
my $role = shift;
my $min_host = '';
my $min_count = 0;
my $agents = MMM::Monitor::Agents->instance();
# Maybe role has a preferred hosts
if ($self->{$role}->{prefer}) {
my $host = $self->{$role}->{prefer};
if ($agents->{$host}->state eq 'ONLINE' && !$agents->{$host}->agent_down) {
return $host;
}
}
# Use host with fewest roles
foreach my $host ( @{ $self->{$role}->{hosts} } ) {
next unless ($agents->{$host}->state eq 'ONLINE');
next if ($agents->{$host}->agent_down);
my $cnt = $self->count_host_roles($host);
next unless ($cnt < $min_count || $min_host eq '');
$min_host = $host;
$min_count = $cnt;
}
return $min_host;
}
=item find_eligible_hosts($role)
find all hosts which can take over the role $role.
=cut
sub find_eligible_hosts($$) {
my $self = shift;
my $role = shift;
my $hosts = {};
my $agents = MMM::Monitor::Agents->instance();
foreach my $host ( @{ $self->{$role}->{hosts} } ) {
next unless ($agents->{$host}->state eq 'ONLINE');
next if ($agents->{$host}->agent_down);
my $cnt = $self->count_host_roles($host);
$hosts->{$host} = $cnt;
}
return $hosts;
}
=item process_orphans
Find orphaned roles and assign them to a host if possible.
=cut
sub process_orphans($$) {
my $self = shift;
my $mode = shift;
foreach my $role (keys(%$self)) {
my $role_info = $self->{$role};
next if ($mode && $role_info->{mode} ne $mode);
foreach my $ip (keys(%{$role_info->{ips}})) {
my $ip_info = $role_info->{ips}->{$ip};
next unless ($ip_info->{assigned_to} eq '');
# Find host which can take over the role - skip if none found
my $host = $self->find_eligible_host($role);
last unless ($host);
# Assign this ip to host
$ip_info->{assigned_to} = $host;
INFO "Orphaned role '$role($ip)' has been assigned to '$host'";
}
}
}
=item obey_preferences
Obey preferences by moving roles to preferred hosts
=cut
sub obey_preferences($) {
my $self = shift;
my $agents = MMM::Monitor::Agents->instance();
foreach my $role (keys(%$self)) {
my $role_info = $self->{$role};
next unless ($role_info->{prefer});
my $host = $role_info->{prefer};
next unless ($agents->{$host}->state eq 'ONLINE');
next if ($agents->{$host}->agent_down);
my @ips = keys( %{ $role_info->{ips} } );
my $ip = $ips[0];
my $ip_info = $role_info->{ips}->{$ip};
my $old_host = $ip_info->{assigned_to};
next if ($old_host eq $host);
$ip_info->{assigned_to} = $host;
INFO "Moving role '$role($ip)' from host '$old_host' to preferred host '$host'";
}
}
=item get_preference_info
Get information about roles with preferred hosts
=cut
sub get_preference_info($) {
my $self = shift;
my $ret = '';
foreach my $role (keys(%$self)) {
my $role_info = $self->{$role};
next unless ($role_info->{prefer});
my $host = $role_info->{prefer};
my $other_host = $self->get_exclusive_role_owner($role);
if ($host eq $other_host) {
$ret .= "# Role $role is assigned to it's preferred host $host.\n";
}
elsif($other_host ne '') {
$ret .= "# Role $role has $host configured as it's preferred host but is assigned to $other_host at the moment.\n";
}
else {
$ret .= "# Role $role has $host configured as it's preferred host.\n";
}
}
return $ret;
}
=item balance
Balance roles with mode 'balanced'
=cut
sub balance($) {
my $self = shift;
foreach my $role (keys(%$self)) {
my $role_info = $self->{$role};
next unless ($role_info->{mode} eq 'balanced');
my $hosts = $self->find_eligible_hosts($role);
next if (scalar(keys(%$hosts)) < 2);
while (1) {
my $max_host = '';
my $min_host = '';
foreach my $host (keys(%$hosts)) {
$max_host = $host if ($max_host eq '' || $hosts->{$host} > $hosts->{$max_host});
$min_host = $host if ($min_host eq '' || $hosts->{$host} < $hosts->{$min_host});
}
if ($hosts->{$max_host} - $hosts->{$min_host} <= 1) {
last;
}
$self->move_one_ip($role, $max_host, $min_host);
$hosts->{$max_host}--;
$hosts->{$min_host}++;
}
}
}
=item move_one_ip($role, $host1, $host2)
Move one IP of role $role from $host1 to $host2.
=cut
sub move_one_ip($$$$) {
my $self = shift;
my $role = shift;
my $host1 = shift;
my $host2 = shift;
foreach my $ip (keys(%{$self->{$role}->{ips}})) {
my $ip_info = $self->{$role}->{ips}->{$ip};
next unless ($ip_info->{assigned_to} eq $host1);
INFO "Moving role '$role($ip)' from host '$host1' to host '$host2'";
$ip_info->{assigned_to} = $host2;
return 1;
}
# No ip was moved
return 0;
}
=item find_by_ip($ip)
Find name of role with IP $ip.
=cut
sub find_by_ip($$) {
my $self = shift;
my $ip = shift;
foreach my $role (keys(%$self)) {
return $role if (defined($self->{$role}->{ips}->{$ip}));
}
return undef;
}
=item set_role($role, $ip, $host)
Set role $role with IP $ip to host $host.
NOTE: No checks are done. Caller should assure that:
Role is valid, IP is valid, Host is valid, Host can handle role
=cut
sub set_role($$$$) {
my $self = shift;
my $role = shift;
my $ip = shift;
my $host = shift;
$self->{$role}->{ips}->{$ip}->{assigned_to} = $host;
}
=item exists($role)
Check if role $role exists.
=cut
sub exists($$) {
my $self = shift;
my $role = shift;
return defined($self->{$role});
}
=item exists_ip($role, $ip)
Check if role $role with IP $ip exists.
=cut
sub exists_ip($$$) {
my $self = shift;
my $role = shift;
my $ip = shift;
return 0 unless defined($self->{$role});
return defined($self->{$role}->{ips}->{$ip});
}
=item is_exclusive($role)
Determine whether given role is an exclusive role.
=cut
sub is_exclusive($$) {
my $self = shift;
my $role = shift;
return 0 unless defined($self->{$role});
return ($self->{$role}->{mode} eq 'exclusive');
}
=item get_valid_hosts($role)
Get all valid hosts for role $role.
=cut
sub get_valid_hosts($$) {
my $self = shift;
my $role = shift;
return () unless defined($self->{$role});
return $self->{$role}->{hosts};
}
=item can_handle($role, $host)
Check if host $host can handle role $role.
=cut
sub can_handle($$$) {
my $self = shift;
my $role = shift;
my $host = shift;
return 0 unless defined($self->{$role});
return grep({$_ eq $host} @{$self->{$role}->{hosts}});
}
=item is_master($host)
Check if host $host can handle role $role.
=cut
sub is_master($$) {
my $self = shift;
my $host = shift;
my $role = $self->{$main::config->{active_master_role}};
return 0 unless defined($role);
return grep({$_ eq $host} @{$role->{hosts}});
}
=item is_active_master_role($role)
Check whether $role is the active master role.
=cut
sub is_active_master_role($$) {
my $self = shift;
my $role = shift;
return ($role eq $main::config->{active_master_role});
}
1;
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