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=head1 NAME |
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AnyEvent::MP::LogCatcher - catch all logs from all nodes |
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=head1 SYNOPSIS |
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use AnyEvent::MP::LogCatcher; |
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=head1 DESCRIPTION |
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This relatively simple module overrides C<$AnyEvent::MP::Kernel::WARN> on |
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every node and sends all log messages to the node running this service. |
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No attempt to buffer log messages on connection loss, or retransmit lost |
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messages, is done. |
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=head1 GLOBALS AND FUNCTIONS |
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=over 4 |
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=cut |
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package AnyEvent::MP::LogCatcher; |
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|
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use common::sense; |
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use Carp (); |
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use POSIX (); |
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|
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use AnyEvent (); |
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use AnyEvent::Util (); |
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use AnyEvent::MP; |
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use AnyEvent::MP::Kernel; |
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use base "Exporter"; |
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$AnyEvent::MP::Kernel::WARN->(7, "starting log catcher service."); |
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our $LOGLEVEL; |
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our %lport; # local logging ports |
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# other nodes connect via this |
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sub connect { |
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my ($version, $rport, $loglevel) = @_; |
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my $cb = sub { |
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snd $rport, @_ |
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if $_[0] <= $loglevel; |
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}; |
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push @AnyEvent::MP::Kernel::WARN, $cb; |
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|
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# monitor them, silently die |
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mon $rport, sub { |
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@AnyEvent::MP::Kernel::WARN = grep $_ != $cb, @AnyEvent::MP::Kernel::WARN; |
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}; |
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} |
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sub mon_node { |
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my ($node, $is_up) = @_; |
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return unless $is_up; |
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my $lport = $lport{$node} = port { |
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my ($level, $msg) = @_; |
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$msg =~ s/\n$//; |
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printf STDERR "%s [%s] <%d> %s\n", |
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(POSIX::strftime "%Y-%m-%d %H:%M:%S", localtime time), |
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$node, |
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$level, |
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$msg; |
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}; |
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# establish connection |
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AnyEvent::MP::Kernel::snd_to_func $node, "AnyEvent::MP::LogCatcher::connect", 0, $lport, $LOGLEVEL; |
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mon $node, $lport; |
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} |
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=item AnyEvent::MP::LogCatcher::catch [$level] |
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Starts catching all log messages from all nodes with level C<$level> or |
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lower. If the C<$level> is C<undef>, then stop catching all messages |
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again. |
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Example: start a node that catches all messages (you might have to specify |
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a suitable profile name). |
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|
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aemp run profilename services '[["AnyEvent::MP::LogCatcher::catch",9]]' |
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=cut |
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sub catch { |
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$LOGLEVEL = $_[0]; |
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kil $_, "restart" for values %lport; |
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%lport = (); |
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return unless defined $LOGLEVEL; |
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mon_node $_, 1 |
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for up_nodes; |
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mon_nodes \&mon_node; |
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() |
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} |
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=back |
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=head1 SEE ALSO |
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|
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L<AnyEvent::MP>. |
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=head1 AUTHOR |
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|
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Marc Lehmann <schmorp@schmorp.de> |
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http://home.schmorp.de/ |
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=cut |
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1 |
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