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Re: Seeking guidance for more idiomatic way of (re)writing this script.

by perl514 (Pilgrim)
on Jan 16, 2013 at 09:13 UTC ( #1013540=note: print w/replies, xml ) Need Help??

in reply to Seeking guidance for more idiomatic way of (re)writing this script.

Hi Topher,

Thank you very much. I am yet to work out the subroutine part, but will do it asap. Thanks for all the suggestions. The arguments to a subroutine is something that I find a trifle confusing, but I'll work on that.


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Re^2: Seeking guidance for more idiomatic way of (re)writing this script.
by topher (Scribe) on Jan 17, 2013 at 00:14 UTC

    By "arguments to a subroutine", I'm referring to passing a special value that the subroutine could match against to determine what it should do. For example, below is a quick attempt to pull out your e-mail handling and move it to a separate function, along with how I might call it.

    Here's where I would be making use of the function, which I called send_mail() just to stick with what I'd used previously:
    open( my $fh, "<", $array_ip_list ) or send_mail("ip_list_error"), die "IP List File - nas_array_ip_list.txt not found"; # [ . . . Do lots of stuff here . . . ] # If our external commands completed successfully, send our e-mail if ($result_from_nas_check_function) { send_mail( "results", $filename ); # [ Clean up after ourselves, delete our temp file, etc. ] exit 0; } else { # [ Notify e-mail that an error occured ] # [ Clean up after ourselves, delete our temp file, etc. ] die "Something went wrong."; }

    And here's an example of how I might define the send_mail() function, where I tell it what kind of e-mail it is sending, and then let it do the work:

    # Expects at least 1 argument matching the type of e-mail to send, and # optionally the additional arguments it might need. If this got much # more complicated, it might be worth passing the second argument as a # hash to simplify multiple values coming in. sub send_mail { # These could go at the beginning of your script, I just put them # here to make this a more complete example. use MIME::Lite; MIME::Lite->send( "smtp", "" ); my $type = shift; # what type of message should we send? my @args = @_; my $from = ''; my $to = ''; my $msg; if ( $type eq "ip_list_error" ) { $msg = MIME::Lite->new( From => $from, To => $to, Data => "Error:nas_array_ip_list.txt:$!.$ +^E\n", Subject => "IP List File - nas_array_ip_list +.txt - " . "Not Found For $0 Script on $ENV{COMPUTE +RNAME}\n", ); } elsif ( $type eq "results" ) { my $filename = $args[0]; $msg = MIME::Lite->new( From => $from, To => $to, Subject => "Automated Check For NAS DataMover Health.", Type => 'Multipart/mixed', ); $msg->attach( Type => 'TEXT', Path => $filename, Filename => $filename, Disposition => 'inline', ); } else { die "send_mail - bad type: $type\n" } # This will send our e-mail, regardless of which one we built. $msg->send; }

    Update: Added the final else, thanks to wfsp's excellent suggestion.


      I'd consider having

      else { die "send_mail - bad type: $type\n" }
      at the end.

        Excellent suggestion; I should have thought to include something like that.

        I'll update the function to include it.

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