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PostgreSQL hot-standby replication support #103

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PostgreSQL hot-standby replication support #103

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17 changes: 17 additions & 0 deletions lib/DBIx/Class/Storage/DBI/Pg.pm
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Expand Up @@ -237,6 +237,23 @@ sub deployment_statements {
$self->next::method($schema, $type, $version, $dir, $sqltargs, @rest);
}

sub is_replicating {
my $repl = 'select pg_last_xlog_receive_location() AS replicating';
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Even simpler:

return scalar shift->_get_dbh->selectrow_array('select pg_last_xlog_receive_location() is not null');`

my $status = shift->_get_dbh->selectrow_hashref($repl);
return 1 if defined $status->{replicating};
return 0;
}

sub lag_behind_master {
my $repl = 'SELECT '
.'CASE WHEN pg_last_xlog_receive_location() = pg_last_xlog_replay_location() '
.'THEN 0 '
.'ELSE EXTRACT (EPOCH FROM now() - pg_last_xact_replay_timestamp())'
.'END AS log_delay';
my $status = shift->_get_dbh->selectrow_hashref($repl);
return $status->{log_delay};
}

1;

__END__
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