224 lines
6.4 KiB
Perl
224 lines
6.4 KiB
Perl
package Rss2Html::Feed;
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=head1 Name
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Rss2Html::Feed - a feed
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=head1 Description
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This class represents a single feed.
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It currently has only one public method, update(), which updates the
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feed.
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=cut
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use strict;
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use warnings;
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use v5.14;
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use Moose;
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use Cache::Memcached;
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use Encode qw(decode_utf8);
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use HTTP::Date;
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use XML::Atom::Client;
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use XML::RAI;
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with 'MooseX::Log::Log4perl';
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has 'id' => (
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is => 'rw',
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);
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has 'url' => (
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is => 'rw',
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);
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has 'active' => (
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is => 'rw',
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);
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has 'last_update' => (
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is => 'rw',
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);
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has 'title' => (
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is => 'rw',
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);
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has 'type' => (
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is => 'rw',
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);
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has 'allow_img' => (
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is => 'rw',
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);
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has 'expire' => (
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is => 'rw',
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);
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has 'dbh' => (
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is => 'rw',
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);
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my $mcd = Cache::Memcached->new(servers => ['127.0.0.1:11211']);
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=head1 Methods
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=cut
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=head2 update
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Update the feed. This is unconditional. The logic to decide which feeds
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must be updated is in L<Rss2Html::FeedList::update_adaptive>.
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=cut
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sub update {
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my ($self) = @_;
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my $dbh = $self->dbh;
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my $now = int(time());
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if ($self->{type} eq 'rss') {
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local $@ = "unknown error";
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# XML::RAI has a parse_uri method, but we explicitely fetch the URI to get better diagnostics.
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# Probably should do this for atom, too, so we can autodetect the feed type.
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my $ua = LWP::UserAgent->new;
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$ua->agent("rss2html/1.0 (+http://www.hjp.at/projekte/rss2html/)");
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my $response = $ua->get($self->{url});
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if ($response->code != 200) {
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$self->log->warn("GET $self->{url} failed: " . $response->status_line);
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return;
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}
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$self->log->info("$self->{url} has content type " . $response->content_type);
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my $rai = eval {XML::RAI->parse_string($response->content) };
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if ($rai) {
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$rai->time_format('EPOCH');
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if ($rai->channel->title ne $self->{title}) {
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$self->log->info("set title");
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$dbh->do("update feeds set title=? where id=?", {},
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$rai->channel->title, $self->{id});
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}
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$self->log->info("checking " . scalar(@{$rai->items}) . " items in db");
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for my $item ( @{$rai->items} ) {
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my $item_db = $dbh->selectrow_hashref("select * from items where link=?", {}, $item->link);
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if ($item_db) {
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$self->log->info("item $item_db->{id} seen");
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$dbh->do("update items set seen=? where id=?", {}, $now, $item_db->{id});
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} else {
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$self->log->info("new");
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my $issued = $item->issued // $now;
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if ($issued < $self->{last_update} || $issued > $now) {
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# $issued is clearly wrong. Could be any time between $self->{last_update} and $now.
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# Choose a random time in the interval.
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my $guess_issued = $self->{last_update} + int(rand($now - $self->{last_update}));
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$self->log->info("fixing up issued time: $issued -> $guess_issued");
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$issued = $guess_issued;
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}
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$self->log->info("item " . $item->link . " new");
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$dbh->do("insert into items(title, link, content, issued, seen, feed_id) values(?, ?, ?, ?, ?, ?)",
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{},
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$item->title, $item->link, $item->content, $issued, $now, $self->{id}
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);
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$self->invalidate_item_info;
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}
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}
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} else {
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$self->log->error("error getting $self->{url}: $@");
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}
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} elsif ($self->{type} eq 'atom') {
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my $api = XML::Atom::Client->new();
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my $atomfeed = $api->getFeed($self->{url});
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if ($atomfeed) {
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my @items = $atomfeed->entries;
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for my $item (@items) {
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my $link = $self->atom_main_link($item);
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my $item_db = $dbh->selectrow_hashref("select * from items where link=?", {}, $link);
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if ($item_db) {
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$self->log->info("item $item_db->{id} seen");
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$dbh->do("update items set seen=? where id=?", {}, $now, $item_db->{id});
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} else {
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$self->log->info("new");
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my $title = decode_utf8($item->title); # XXX - Workaround?
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my $content = $item->content;
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my $summary = $item->summary;
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my $body = $content ? $content->body :
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defined($summary) ? decode_utf8($summary) : undef;
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$self->log->info("item " . $link . " new");
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my $issued = str2time($item->updated) // $now;
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if ($issued < $self->{last_update} || $issued > $now) {
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# $issued is clearly wrong. Could be any time between $self->{last_update} and $now.
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# Choose a random time in the interval.
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my $guess_issued = $self->{last_update} + int(rand($now - $self->{last_update}));
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$self->log->info("fixing up issued time: $issued -> $guess_issued");
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$issued = $guess_issued;
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}
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$dbh->do("insert into items(title, link, content, issued, seen, feed_id) values(?, ?, ?, ?, ?, ?)",
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{},
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$title, $link, $body, $issued, $now, $self->{id}
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);
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$self->invalidate_item_info;
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}
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}
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}
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} else {
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print "<p>unknown type $self->{type}</p>\n";
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$dbh->do("update feeds set title=?, last_update=? where id=?", {},
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'unknown', $now, $self->{id});
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return;
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}
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# mark all but the last 100 entries as old, so they aren't shown by default.
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$dbh->do("update items set old=1
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where id in (select id from items
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where feed_id=? and (old is null or old != 1)
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order by issued desc offset 100)",
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{},
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$self->{id});
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$dbh->do("update feeds set last_update=? where id=?", {}, $now, $self->{id});
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}
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sub atom_main_link {
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my ($self, $item) = @_; # XXX should probably be a method of $item
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for my $link ($item->link) {
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$self->log->info("checking href ", $link->href, "\n");
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if (defined $link->rel && $link->rel ne 'alternate') {
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$self->log->info("rel ", $link->rel, " unexpected, skip");
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next;
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}
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if (defined $link->type && $link->type ne 'text/html') {
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$self->log->info("type ", $link->type, " unexpected, skip\n");
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next;
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}
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$self->log->info("match!\n");
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return $link->href;
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}
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}
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sub invalidate_item_info {
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my ($self) = @_;
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my $dbh = $self->dbh;
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my $users = $dbh->selectcol_arrayref("select distinct username from read");
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for my $user (@$users) {
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$mcd->delete($self->item_info_key($user));
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}
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}
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sub item_info_key {
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my ($self, $user) = @_;
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return "rss2html/item_info/" . $user . "/" . $self->id;
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}
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#---
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__PACKAGE__->meta->make_immutable;
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1;
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# vim: tw=132
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