Log::Log4perl::Appender::Socket - Log to a socket
use Log::Log4perl::Appender::Socket;
my $appender = Log::Log4perl::Appender::Socket->new(
PeerAddr => "server.foo.com",
PeerPort => 1234,
);
$appender->log(message => "Log me\n");
This is a simple appender for writing to a socket. It relies on the IO::Socket::INET manpage and offers all parameters this module offers.
Upon destruction of the object, pending messages will be flushed and the socket will be closed.
If the appender cannot contact the server during the initialization
phase (while running the constructor new), it will die().
If the appender fails to log a message because the socket's send()
method fails (most likely because the server went down), it will
try to reconnect once. If it succeeds, the message will be sent.
If the reconnect fails, a warning is sent to STDERR and the log()
method returns, discarding the message.
If the option silent_recovery is given to the constructor and
set to a true value, the behaviour is different: If the socket connection
can't be established at initialization time, a single warning is issued.
Every log attempt will then try to establish the connection and
discard the message silently if it fails.
If you don't even want the warning, set the no_warning option to
a true value.
Connecting at initialization time may not be the best option when
running under Apache1 Apache2/prefork, because the parent process creates
the socket and the connections are shared among the forked children--all
the children writing to the same socket could intermingle messages. So instead
of that, you can use defer_connection which will put off making the
connection until the first log message is sent.
Write a server quickly using the IO::Socket::INET module:
use IO::Socket::INET;
my $sock = IO::Socket::INET->new(
Listen => 5,
LocalAddr => 'localhost',
LocalPort => 12345,
Proto => 'tcp');
while(my $client = $sock->accept()) {
print "Client connected\n";
while(<$client>) {
print "$_\n";
}
}
Start it and then run the following script as a client:
use Log::Log4perl qw(:easy);
my $conf = q{
log4perl.category = WARN, Socket
log4perl.appender.Socket = Log::Log4perl::Appender::Socket
log4perl.appender.Socket.PeerAddr = localhost
log4perl.appender.Socket.PeerPort = 12345
log4perl.appender.Socket.layout = SimpleLayout
};
Log::Log4perl->init(\$conf);
sleep(2);
for(1..10) {
ERROR("Quack!");
sleep(5);
}
Mike Schilli <log4perl@perlmeister.com>, 2003