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|
#!/usr/bin/perl -w
use strict;
use POE;
use POE qw(Wheel::FollowTail Filter::Line Driver::SysRW);
use Term::Visual;
my @files = qw(/var/log/messages /var/log/kernel.log /var/log/maillog
/var/log/ftp.log /var/log/lpd-errs);
# Start Term::Visual.
my $vt = Term::Visual->new( Alias => "interface" );
$vt->set_palette( mycolor => "magenta on black",
statcolor => "green on black",
sockcolor => "cyan on black",
ncolor => "white on black",
st_frames => "bright cyan on blue",
st_values => "bright white on blue",
stderr_bullet => "bright white on red",
stderr_text => "bright yellow on black",
err_input => "bright white on red",
help => "white on black",
help_cmd => "bright white on black" );
my $window_id = $vt->create_window(
Window_Name => "logmon",
Status => { 0 =>
{ format => "\0(st_frames)" .
" [" .
"\0(st_values)" .
"%8.8s" .
"\0(st_frames)" .
"] " .
"\0(st_values)" .
"%s",
fields => [qw( time name )] },
1 =>
{ format => " Observing: %s",
fields => [ qw( file ) ] },
},
Buffer_Size => 1000,
History_Size => 50,
Title => "System Log Monitor" );
POE::Session->create
(inline_states =>
{ _start => \&start_guts,
got_term_input => \&handle_term_input,
update_time => \&update_time,
update_file => \&update_file,
input_tail => \&input_tail,
}
);
## Initialize the back-end guts of the "client".
sub start_guts {
my ($kernel, $heap) = @_[KERNEL, HEAP];
# Tell the terminal to send me input as "got_term_input".
$kernel->post( interface => send_me_input => "got_term_input" );
$kernel->yield( "update_time" );
my $window_name = $vt->get_window_name($window_id);
$vt->set_status_field( $window_id, name => $window_name );
my $filist = join(" ",@files);
$filist =~ s!/var/log/!!g;
$vt->set_status_field( $window_id, file => $filist);
# $kernel->yield( update_file => $filist);
# Start Following a File
foreach my $file (@files) {
$heap->{"wheel_$file"} = POE::Wheel::FollowTail->new
( Filename => $file,
Driver => POE::Driver::SysRW->new(),
Filter => POE::Filter::Line->new(),
PollInterval => 1,
InputEvent => "input_tail",
ErrorEvent => \&error_tail,
ResetEvent => \&reset_tail,
);
}
}
### The main input handler for this program. This would be supplied
### by the guts of the client program.
sub handle_term_input {
my ($kernel, $heap, $input, $exception) = @_[KERNEL, HEAP, ARG0, ARG1];
# Got an exception. These are interrupt (^C) or quit (^\).
if (defined $exception) {
warn "got exception: $exception";
$vt->delete_window($window_id);
exit;
}
if ($input =~ s{^/\s*(\S+)\s*}{}) {
my $cmd = uc($1);
if ($cmd eq 'QUIT') {
# might close open filehandles here.
$vt->delete_window($window_id);
exit;
}
# Unknown command?
warn "Unknown command: $cmd";
return;
}
}
### Update the time on the status bar.
sub update_time {
my ($kernel, $heap) = @_[KERNEL, HEAP];
# New time format.
use POSIX qw(strftime);
$vt->set_status_field( $window_id, time => strftime("%I:%M %p", localtime) );
# Schedule another time update for the next minute. This is more
# accurate than using delay() because it schedules the update at the
# beginning of the minute.
$kernel->alarm( update_time => int(time() / 60) * 60 + 60 );
}
sub update_file {
my ($kernel,$file) = @_[KERNEL,ARG0];
$vt->set_status_field( $window_id, file => $file );
}
sub input_tail {
my ($heap, $input, $wheel_id) = @_[HEAP, ARG0, ARG1];
$vt->print( $window_id, $input );
}
sub error_tail {
my ($operation, $errnum, $errstr, $wheel_id) = @_[ARG0..ARG3];
warn "Wheel $wheel_id generated $operation error $errnum: $errstr";
}
sub reset_tail {
my $wheel_id = $_[ARG0];
$vt->print( $window_id, "Reset $wheel_id");
}
$poe_kernel->run();
$vt->shutdown;
exit 0;
|
