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# -*- perl -*-
#
# $Id: Log.pm,v 1.3 1999/09/26 14:50:13 joe Exp $
#
# Net::Daemon - Base class for implementing TCP/IP daemons
#
# Copyright (C) 1998, Jochen Wiedmann
# Am Eisteich 9
# 72555 Metzingen
# Germany
#
# Phone: +49 7123 14887
# Email: joe@ispsoft.de
#
# All rights reserved.
#
# You may distribute this package under the terms of either the GNU
# General Public License or the Artistic License, as specified in the
# Perl README file.
#
############################################################################
require 5.004;
use strict;
package Net::Daemon::Log;
$Net::Daemon::Log::VERSION = '0.01';
############################################################################
#
# Name: Log (Instance method)
#
# Purpose: Does logging
#
# Inputs: $self - Server instance
#
# Result: TRUE, if the client has successfully authorized, FALSE
# otherwise.
#
############################################################################
sub OpenLog($) {
my $self = shift;
return 1 unless ref($self);
return $self->{'logfile'} if defined($self->{'logfile'});
if ($Config::Config{'archname'} =~ /win32/i) {
require Win32::EventLog;
$self->{'eventLog'} = Win32::EventLog->new(ref($self), '')
or die "Cannot open EventLog:" . &Win32::GetLastError();
$self->{'$eventId'} = 0;
} else {
eval { require Sys::Syslog };
if ($@) {
die "Cannot open Syslog: $@";
}
if ($^O ne 'solaris' && $^O ne 'freebsd' &&
defined(&Sys::Syslog::setlogsock) &&
eval { &Sys::Syslog::_PATH_LOG() }) {
&Sys::Syslog::setlogsock('unix');
}
&Sys::Syslog::openlog($self->{'logname'} || ref($self), 'pid',
$self->{'facility'} || 'daemon');
}
$self->{'logfile'} = 0;
}
sub Log ($$$;@) {
my($self, $level, $format, @args) = @_;
my $logfile = !ref($self) || $self->OpenLog();
my $tid = '';
if (ref($self) && $self->{'mode'}) {
if ($self->{'mode'} eq 'ithreads') {
if (my $sthread = threads->self()) {
$tid = $sthread->tid() . ", ";
}
} elsif ($self->{'mode'} eq 'threads') {
if (my $sthread = Thread->self()) {
$tid = $sthread->tid() . ", ";
}
}
}
if ($logfile) {
my $logtime = $self->LogTime();
if (ref($logfile)) {
$logfile->print(sprintf("$logtime $level, $tid$format\n", @args));
} else {
printf STDERR ("$logtime $level, $tid$format\n", @args);
}
} elsif (my $eventLog = $self->{'eventLog'}) {
my($type, $category);
if ($level eq 'debug') {
$type = Win32::EventLog::EVENTLOG_INFORMATION_TYPE();
$category = 10;
} elsif ($level eq 'notice') {
$type = Win32::EventLog::EVENTLOG_INFORMATION_TYPE();
$category = 20;
} else {
$type = Win32::EventLog::EVENTLOG_ERROR_TYPE();
$category = 50;
}
$eventLog->Report({
'Category' => $category,
'EventType' => $type,
'EventID' => ++$self->{'eventId'},
'Strings' => sprintf($format, @args),
'Data' => $tid
});
} else {
&Sys::Syslog::syslog($level, "$tid$format", @args);
}
}
sub Debug ($$;@) {
my $self = shift;
if (!ref($self) || $self->{'debug'}) {
my $fmt = shift;
$self->Log('debug', $fmt, @_);
}
}
sub Error ($$;@) {
my $self = shift; my $fmt = shift;
$self->Log('err', $fmt, @_);
}
sub Fatal ($$;@) {
my $self = shift; my $fmt = shift;
my $msg = sprintf($fmt, @_);
$self->Log('err', $msg);
my($package, $filename, $line) = caller();
die "$msg at $filename line $line.";
}
sub LogTime { scalar(localtime) }
1;
__END__
=head1 NAME
Net::Daemon::Log - Utility functions for logging
=head1 SYNOPSIS
# Choose logging method: syslog or Win32::EventLog
$self->{'facility'} = 'mail'; # Default: Daemon
$self->{'logfile'} = undef; # Default
# Choose logging method: stderr
$self->{'logfile'} = 1;
# Choose logging method: IO handle
my $file = IO::File->new("my.log", "a");
$self->{'logfile'} = $file;
# Debugging messages (equivalent):
$self->Log('debug', "This is a debugging message");
$self->Debug("This is a debugging message");
# Error messages (equivalent):
$self->Log('err', "This is an error message");
$self->Error("This is an error message");
# Fatal error messages (implies 'die')
$self->Fatal("This is a fatal error message");
=head1 WARNING
THIS IS ALPHA SOFTWARE. It is *only* 'Alpha' because the interface (API)
is not finalised. The Alpha status does not reflect code quality or
stability.
=head1 DESCRIPTION
Net::Daemon::Log is a utility class for portable logging messages.
By default it uses syslog (Unix) or Win32::EventLog (Windows), but
logging messages can also be redirected to stderr or a log file.
=head2 Generic Logging
$self->Log($level, $msg, @args);
This is the generic interface. The logging level is in syslog style,
thus one of the words 'debug', 'info', 'notice', 'err' or 'crit'.
You'll rarely need info and notice and I can hardly imagine a reason
for crit (critical). In 95% of all cases debug and err will be
sufficient.
The logging string $msg is a format string similar to printf.
=head2 Utility methods
$self->Debug($msg, @args);
$self->Error($msg, @args);
$self->Fatal($msg, @args);
These are replacements for logging with levels debug and err. The difference
between the latter two is that Fatal includes throwing a Perl exception.
=head2 Chossing a logging target
By default logging will happen to syslog (Unix) or EventLog (Windows).
However you may choose logging to stderr by setting
$self->{'logfile'} = 1;
This is required if neither of syslog and EventLog is available. An
alternative option is setting
$self->{'logfile'} = $handle;
where $handle is any object supporting a I<print> method, for example
an IO::Handle object. Usually the logging target is choosen as soon
as you call $self->Log() the first time. However, you may force
choosing the target by doing a
$self->OpenLog();
before calling Log the first time.
=head1 MULTITHREADING
The Multithreading capabitities of this class are depending heavily
on the underlying classes Sys::Syslog, Win32::EventLog or IO::Handle.
If they are thread safe, you can well assume that this package is
too. (The exception being that you should better call
$self->OpenLog() before threading.)
=head1 AUTHOR AND COPYRIGHT
Net::Daemon is Copyright (C) 1998, Jochen Wiedmann
Am Eisteich 9
72555 Metzingen
Germany
Phone: +49 7123 14887
Email: joe@ispsoft.de
All rights reserved.
You may distribute this package under the terms of either the GNU
General Public License or the Artistic License, as specified in the
Perl README file.
=head1 SEE ALSO
L<Net::Daemon(3)>, L<Sys::Syslog(3)>, L<Win32::EventLog(3)>,
L<IO::Handle(3)>
=cut
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