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AnyEvent::Feed - Receiving RSS/Atom Feed reader with XML::Feed

AnyEvent::Feed(3pm) User Contributed Perl Documentation AnyEvent::Feed(3pm)

NAME

AnyEvent::Feed - Receiving RSS/Atom Feed reader with XML::Feed

VERSION

Version 0.3

SYNOPSIS

   use AnyEvent;
   use AnyEvent::Feed;
   my $feed_reader =
      AnyEvent::Feed->new (
         url   => 'http://example.com/atom.xml',
      );
   $feed_reader->fetch (sub {
      my ($feed_reader, $new_entries, $feed, $error) = @_;
      if (defined $error) {
         warn "ERROR: $error\n";
         return;
      }
      # $feed is the XML::Feed object belonging to that fetch.
      for (@$new_entries) {
         my ($hash, $entry) = @$_;
         # $hash a unique hash describing the $entry
         # $entry is the XML::Feed::Entry object of the new entries
         # since the last fetch.
      }
   });
   # Or:
   my $feed_reader =
      AnyEvent::Feed->new (
         url      => 'http://example.com/atom.xml',
         interval => $seconds,
         on_fetch => sub {
            my ($feed_reader, $new_entries, $feed, $error) = @_;
            if (defined $error) {
               warn "ERROR: $error\n";
               return;
            }
            # see above
         }
      );

DESCRIPTION

This module implements some glue between AnyEvent::HTTP and XML::Feed. It can fetch a RSS/Atom feed on a regular interval as well as on customized times. It also keeps track of already fetched entries so that you will only get the new entries.

METHODS

$feed_reader = AnyEvent::Feed->new (url => $url, %args)
This is the constructor for a new feed reader for the RSS/Atom feed reachable by the URL $url. %args may contain additional key/value pairs:
interval => $seconds
If this is set you also have to specify the "on_fetch" callback (see below). It will try to fetch the $url every $seconds seconds and call the callback given by "on_fetch" with the result.
headers => $http_hdrs
Additional HTTP headers for each GET request can be passed in the $http_hdrs hash reference, just like you would pass it to the "headers" argument of the "http_get" request of AnyEvent::HTTP.
username => $http_user
password => $http_pass
These are the HTTP username and password that will be used for Basic HTTP Authentication with the HTTP server when fetching the feed. This is mostly sugar for you so you don't have to encode them yourself and pass them to the "headers" argument above.
on_fetch => $cb->($feed_reader, $new_entries, $feed_obj, $error)
This callback is called if the "interval" parameter is given (see above) with the same arguments as the callback given to the "fetch" method (see below).
entry_ages => $hash
This will set the hash which keeps track of seen and old entries. See also the documentation of the "entry_ages" method below. The default will be an empty hash reference.
max_entry_age => $count
This will set the maximum number of times an entry is kept in the "entry_ages" hash after it has not been seen in the feed anymore. The default value is 2 which means that an entry hash is removed from the "entry_ages" hash after it has not been seen in the feed for 2 fetches.
$feed_reader->url
Just returns the url that this feed reader is fetching from.
$feed_reader->entry_ages ($new_entry_ages)
my $entry_ages = $feed_reader->entry_ages
This will set the age hash which will keep track of already seen entries. The keys of the hash will be the calculated hashes of the entries and the values will be a counter of how often they have NOT been seen anymore (kind of an age counter). After each fetch this hash is updated and seen entries get a value of 0.
$feed_reader->fetch ($cb->($feed_reader, $new_entries, $feed_obj, $error))
This will initiate a HTTP GET on the URL passed to "new" and call $cb when done.
 
$feed_reader is the feed reader object itself. $new_entries is an array reference containing the new entries. A new entry in that array is another array containing a calculated hash over the contents of the new entry, and the XML::Feed::Entry object of that entry. $feed_obj is the XML::Feed feed object used to parse the fetched feed and contains all entries (and not just the 'new' ones).
 
What a 'new' entry is, is decided by a map of hashes as described in the "entry_ages" method's documentation above.

AUTHOR

Robin Redeker, "<elmex@ta-sa.org>"

SEE ALSO

XML::Feed
AnyEvent::HTTP
AnyEvent

BUGS

Known Bugs

There is actually a known bug with encodings of contents of Atom feeds. XML::Atom by default gives you UTF-8 encoded data. You have to set this global variable to be able to use the XML::Feed::Entry interface without knowledge of the underlying feed type:
   $XML::Atom::ForceUnicode = 1;
I've re-reported this bug against XML::Feed, as I think it should take care of this. XML::Atom should probably just fix it's Unicode interface, but it seems to be a bit deserted w.r.t. fixing the bugs in the tracker.

Contact

Please report any bugs or feature requests to "bug-anyevent-feed at rt.cpan.org", or through the web interface at <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=AnyEvent-Feed>. I will be notified and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

You can find documentation for this module with the perldoc command.
    perldoc AnyEvent::Feed
You can also look for information at:
IRC: AnyEvent::Feed IRC Channel
 
See the same channel as the AnyEvent::XMPP module:
 
  IRC Network: http://freenode.net/
  Server     : chat.freenode.net
  Channel    : #ae_xmpp
  Feel free to join and ask questions!
    
AnnoCPAN: Annotated CPAN documentation
 
<http://annocpan.org/dist/AnyEvent-Feed>
CPAN Ratings
 
<http://cpanratings.perl.org/d/AnyEvent-Feed>
RT: CPAN's request tracker
 
<http://rt.cpan.org/NoAuth/Bugs.html?Dist=AnyEvent-Feed>
Search CPAN
 
<http://search.cpan.org/dist/AnyEvent-Feed>
Copyright 2009 Robin Redeker, all rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
2016-03-12 perl v5.22.1