Log::Procmail(3)

NAME
Log::Procmail - Perl extension for reading procmail logfiles.

SYNOPSIS
    use Log::Procmail;

    my $log = new Log::Procmail 'procmail.log';

    # loop on every abstract
    while(my $rec = $log->next) {
        # do something with $rec->folder, $rec->size, etc.
    }

DESCRIPTION

  Log::Procmail
Log::Procmail reads procmail(1) logfiles and returns the abstracts one by one.

$log = Log::Procmail->new( @files );
    Constructor for the procmail log reader. Returns a reference to a Log::Procmail object.

    The constructor accepts a list of file as parameter. This allows you to read records from several files in a row:

        $log = Log::Procmail->new( "$ENV{HOME}/.procmail/log.2",
                                   "$ENV{HOME}/.procmail/log.1",
                                   "$ENV{HOME}/.procmail/log", );

    When $log reaches the end of the file "log", it doesn't close the file. So, after procmail processes some incoming mail, the next call to next() will return the new records.

$rec = $log->next
    Return a Log::Procmail::Abstract object that represent an entry in the log file. Return undef if there is no record left in the file.

    When the Log::Procmail object reaches the end of a file, and this file is not the last of the stack, it closes the current file and opens the next one.

    When it reaches the end of the last file, the file is not closed. Next time the record method is called, it will check again in case new abstracts were appended.

    Procmail(1) log look like the following:

        From karen644552@btinternet.com  Fri Feb  8 20:37:24 2002
         Subject: Stock Market Volatility Beating You Up? (18@2)
          Folder: /var/spool/mail/book                                                 2840

    Some informational messages can be put by procmail(1) in the log file. If the "errors" attribute is true, these lines are returned one at a time.

    With errors enabled, you have to check that next() actually returns a Log::Procmail::Abstract object. Here is an example:

        $log->errors(1);

        # fetch data
        while ( $rec = $log->next ) {

            # if it's an error line
            if ( !ref $rec ) {
                # this is not a log, but an informational message
                # do something with it
                next;
            }

            # normal log processing
        }

$log->push( $file [, $file2 ...] );
    Push one or more files on top of the list of log files to examine. When Log::Procmail runs out of abstracts to return (i.e. it reaches the end of the file), it transparently opens the next file (if there is one) and keeps returning new abstracts.

$log->errors( [bool] );
    Set or get the error flag. If set, when the next() method will return the string found in the log file, instead of ignoring it. Be careful: it is a simple string, not a Log::Procmail::Abstract object.

    Default is to return no error.

$fh = $log->fh()
    Returns the currently opened filehandle, from which the next call to "next()" will try to read a record.

$select = $log->select()
    Return a IO::Select object that watches the currently opened filehandle.

    You are not supposed to use "add()" or "remove()" on the returned IO::Select object.

    Additional warning for "MSWin32", "NetWare", "dos", "VMS", "riscos" and "beos": on those systems, "select()" returns "undef". (Check ext/IO/t/io_sel.t in the Perl sources for details. Hint: look for the message 4-arg select is only valid on sockets.)

  Log::Procmail::Abstract
Log::Procmail::Abstract is a class that hold the abstract information. Since the abstract hold From, Date, Subject, Folder and Size information, all this can be accessed and modified through the from(), date(), subject(), folder() and size() methods.

Log::Procmail::next() returns a Log::Procmail::Abstract object.

Log::Procmail::Abstract accessors
    The Log::Procmail::Abstract object accessors are named from(), date(), subject(), folder() and size(). They return the relevant information when called without argument, and set it to their first argument otherwise.

        # count mail received per folder
        while( $rec = $log->next ) { $folder{ $rec->folder }++ }

    The source() accessor returns the name of the log file or the string representation of the handle, if a filehandle was given.

$rec->ymd()
    Return the date in the form "yyyymmmddhhmmss" where each field is what you think it is. ";-)" This method is read-only.

EXAMPLES
Here is an example procmail biff-like script, courtesy of Ian Langworth:

    #/usr/bin/perl -w
    use strict;
    use Log::Procmail;

    use constant LOGFILE       => "$ENV{HOME}/procmail.log";
    use constant VALID_FOLDERS => [qw( agent inbox perl systems )];
    my $format = "\%8s: \%-30.30s / %s\n";

    my $log = Log::Procmail->new( LOGFILE );
    $log->errors(1);

    while ( $log->select->can_read ) {
        my $rec = $log->next;

        # error?
        warn "$rec\n", next unless ref $rec;

        # ignore mailboxes we don't care about
        next unless grep { $_ eq $rec->folder } @{ VALID_FOLDERS() };

        # print data
        printf $format, From    => $rec->from;
        printf $format, Subject => $rec->subject, $rec->folder;
    }

TODO
The Log::Procmail object should be able to read from STDIN.

BUGS

•   Sometimes procmail(1) logs are mixed up. When this happens, I've chosen to accept them the way mailstat(1) does: they are discarded unless they have a "Folder" line.

•   If you use Log::Procmail and the select() method to follow a live logfile as in the above example, please not that Log::Procmail will not detect when the file is rotated.

Please report all bugs through the rt.cpan.org interface:

<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Log-Procmail>

AUTHOR
Philippe "BooK" Bruhat <book@cpan.org>.

ACKNOWLEDGMENTS
Thanks to Briac "Oeufmayo" Pilpré and David "Sniper" Rigaudiere for early comments on irc. Thanks to Olivier "rs" Poitrey for giving me his huge procmail log file (51 Mb spanning over a two-year period) and for probably being the first user of this module. Many thanks to Michael Schwern for insisting so much on the importance of tests and documentation.

Many thanks to "Les Mongueurs de Perl" for making cvs.mongueurs.net available for Log::Procmail and many other projects.

COPYRIGHT
Copyright (c) 2002-2013, Philippe Bruhat. All Rights Reserved.

LICENSE
This module is free software. It may be used, redistributed and/or modified under the terms of the Perl Artistic License (see http://www.perl.com/perl/misc/Artistic.html)

SEE ALSO
perl(1), procmail(1).