in reply to Re^4: trying to implement file tail with regular expression
in thread trying to implement file tail with regular expression

Try this. Note I have used a module to read the ini file.

#!perl
use strict;
use File::Tail;
use Config::Tiny;

#die "Usage: $0 <app_root_dir>" unless @ARGV == 1;

my $app_root_dir = shift;

=head1 content of param.ini 
DIAGFILE  = diagfile
HOSTNAME1 = hostname1
HOSTNAME2 = hostname2
=cut
my $Config = Config::Tiny->read( "$app_root_dir/config/param.ini" )
      or die "$!";

my $ref = tie *DIAG,"File::Tail",(
    name        => $Config->{'_'}{'DIAGFILE'},
    interval    => 1,  # wait at start
    maxinterval => 10, # change to suit
    adjustafter => 10  # change to suit
);

my $restart;
while (my $line = <DIAG>) { 
  if ($line =~ /is higher than 5 seconds/) {
    # restart only if more than 60 seconds since last restart
    if (time() - $restart > 60) {
      run_command('stop',1);
      run_command('stop',2);
      run_command('start',1);
      run_command('start',2);
      $restart = time();
    }
  }
}

# execute start/stop
sub run_command {
  my ($action,$n) = @_;
  my $host = $Config->{_}{'HOSTNAME'.$n};
  my $cmd = join ' ','sc',"\\\\$host",$action,'AudioSrv',
  ">$app_root_dir\\logs\\${action}ServiceOutput${n}.txt";

  #system($cmd); 
  print "$cmd\n"; # replace with system after testing
}

[download]
poj

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Re^6: trying to implement file tail with regular expression
by mkhayat (Initiate) on Feb 17, 2016 at 05:29 UTC

    again thanks for your support. I tried your code but I faced the same issue. when its reaching while (my $line = <DIAG>) its stop. I am using Eclipse for step by step troubleshooting. I dont understand why this is happening. without using the file tail class it works fine and I was able to read from the file!!!!!! do you have any other idea please?

[reply]

      Perhaps try it without tie.

      #my $ref = tie *DIAG,"File::Tail",(
#    name        => $Config->{'_'}{'DIAGFILE'},
#    interval    => 1,  # wait at start
#    maxinterval => 10, # change to suit
#    adjustafter => 10  # change to suit
#);

my $fh = File::Tail->new(
  name        => $Config->{'_'}{'DIAGFILE'},
  interval    => 1,  # wait at start
  maxinterval => 10, # change to suit
  adjustafter => 10  # change to suit
);

my $restart;
#while (my $line = <DIAG>) { 
while (my $line = $fh->read) { 
  print $line;
  if ($line =~ /is higher than 5 seconds/) {
.
.

      [download]

      This was the log generator I use to test the script

      #!perl
use strict;

my $n = 3; my $s = 10;
print "Log generator running .. $n events every $s secs .. \n";
open OUT,'>','c:/temp/diag.log' or die "$!";
select OUT; $|=1;
while (1){
  print STDOUT scalar localtime."\n";
  for (1..$n){
    print scalar localtime,"-  abc is higher than 5 seconds xyz\n";
  }
  print scalar localtime."- some other log message $_\n" for 0...rand(
+10);
  sleep($s);
}

      [download]
      poj
[reply]
[d/l]
[select]

        same thing once it reach while (my $line = $fh->read) it stop. :(

[reply]

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