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# Dobrica Pavlinusic, <dpavlin@rot13.org> 02/22/07 20:30:00 CET |
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use strict; |
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use warnings; |
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package Grep::Source; |
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use Carp qw/verbose/; |
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use Module::Pluggable search_path => 'Grep::Source', sub_name => 'sources', require => 1; |
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use base qw(Class::Accessor Jifty::Object); |
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Grep::Source->mk_accessors( qw(feed uri q new_items collection search_obj tree) ); |
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|
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use HTML::TreeBuilder; |
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use WWW::Mechanize; |
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use XML::Feed; |
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use URI; |
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use HTML::ResolveLink; |
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|
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use Data::Dump qw/dump/; |
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=head1 NAME |
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Grep::Source - base class for implementation of different sources for Grep |
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=head1 METHODS |
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This is mostly documentation because most of methods are implemented by plugins. |
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=head2 sources |
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my @sources = Grep::Source->sources(); |
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Returns all available sources. |
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=cut |
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|
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Jifty->log->debug("Found source plugins: ", join(", ", __PACKAGE__->sources() ) ); |
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=head2 new |
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my $source = Grep::Source->new({ feed => $feed_record }); |
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This will also setup: |
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=head2 feed |
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isa L<Grep::Model::Feed> |
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=head2 search |
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my $collection = $source->search( 'query string' ); |
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It will also setup following accessors: |
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=head2 q |
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|
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Search query |
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=head2 uri |
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URI of feed with embedded search query |
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=head2 new_items |
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Number of new items in result collection |
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=head2 collection |
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Actuall results which is L<Grep::Model::ItemCollection>, so following will |
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work: |
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print "and ", $self->collection->count, " total items"; |
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Also setups number of new items |
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print $source->new_items, " items new"; |
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=cut |
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sub search { |
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my $self = shift; |
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my $q = shift; |
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$q ? $self->q( $q ) : $q = $self->q; |
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die "no q?" unless ( $self->q ); |
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die "no feed?" unless ( $self->feed ); |
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die "feed not Grep::Model::Feed" unless ( $self->feed->isa('Grep::Model::Feed') ); |
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my $message; |
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my $uri = $self->feed->uri; |
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if ($uri =~ m/%s/) { |
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$uri = $self->feed->search_uri( $q ); |
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$message = 'Searching'; |
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} else { |
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$message = 'Fetching'; |
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} |
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$message .= ' ' . $self->feed->title . " at $uri"; |
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$self->uri( $uri ); |
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$self->log->info( $message ); |
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$self->collection( Grep::Model::ItemCollection->new() ); |
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my $class = $self->feed->source || 'Grep::Source::Feed'; |
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$self->log->debug("using $class"); |
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$self->search_obj( Grep::Search->new() ); |
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$self->log->debug("created " . $self->search_obj); |
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$class->fetch( $self ); |
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$self->search_obj->finish; |
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return $self->collection; |
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} |
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=head2 add_record |
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Plugins will be called with parametar C<$parent> so they can call this method to add |
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record into result collection (and store in cache and index). |
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$parent->add_record( id => 42, foo => 'bar', ... ); |
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This will also update L</new_items> |
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=cut |
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sub add_record { |
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my $self = shift; |
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$self->log->confess("no search_obj") unless ($self->search_obj); |
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my $i = Grep::Model::Item->new(); |
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my $rec = {@_}; |
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$self->log->debug("resolving links using base ", $rec->{link}); |
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my $resolver = HTML::ResolveLink->new( base => $rec->{link} ); |
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$rec->{content} = $resolver->resolve( $rec->{content} ); |
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my ($ok,$msg) = $i->load_or_create( %$rec ); |
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$msg ||= ''; |
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if ( $ok ) { |
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$self->log->debug("item ", $i->id, ": $msg"); |
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$self->collection->add_record( $i ); |
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# is new record? |
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if ( $msg !~ m/^Found/ ) { |
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$self->search_obj->add( $i ); |
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$self->new_items( ( $self->new_items || 0 ) + 1 ); |
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} |
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} else { |
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warn "can't add entry ", dump( @_ ), "\n"; |
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} |
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} |
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=head2 content_class |
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Return class registred for particular content. |
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my $class = $source->content_class( $content ); |
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=cut |
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sub content_class { |
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my $self = shift; |
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my $content = shift or die "no content?"; |
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foreach my $s ( $self->sources ) { |
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$self->log->debug("testing source class $s"); |
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if ( $s->can('content_have') ) { |
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my $regex = $s->content_have( $content ) or |
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die "${s}->content_have didn't return anything"; |
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die "${s}->content_have didn't return regex but ", dump( $regex ), " ref ", ref( $regex ) |
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unless ( ref($regex) eq 'Regexp' ); |
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if ( $content =~ $regex ) { |
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$self->log->debug("${s}->content_have succesful"); |
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return $s; |
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} |
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} |
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} |
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} |
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=head2 scrape |
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Create semi-complex L<WWW::Mechanize> rules to scrape page |
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=cut |
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sub element_by_triplet { |
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my $self = shift; |
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my $args = {@_}; |
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my $tree = $args->{tree} || die "no tree"; |
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my $message = $args->{message}; |
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my $fatal = $args->{fatal}; |
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die "no templates" unless defined( $args->{templates} ); |
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my @templates = @{ $args->{templates} }; |
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push @templates, ( undef, undef ) if ( $#templates == 0 ); |
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die "wrapper doesn't have 3 elements but ", $#templates unless ( |
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( $#templates + 1 ) % 3 == 0 |
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); |
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my ( $result, $el, $attr, $value ); |
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my @tags; |
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while ( @templates ) { |
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( $el,$attr,$value ) = splice( @templates, 0, 3 ); |
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my $tag = $attr ? "<$el $attr=\"$value\">" : "<$el>"; |
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push @tags, $tag; |
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$self->log->debug("looking for $message $tag"); |
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$result = $tree->look_down( '_tag', $el, sub { |
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return 1 unless ( $attr && $value ); |
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( $_[0]->attr( $attr ) || '' ) eq $value; |
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}); |
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last if $result; |
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} |
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if ( ! $result ) { |
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my $msg = "can't find $message ", join(" ", @tags); |
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die $msg if ( $fatal ); |
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warn $msg; |
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return; |
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} |
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return $result; |
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} |
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sub scrape { |
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my $self = shift; |
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my $args = {@_}; |
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$self->log->debug("scrape with args ",dump($args)); |
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my ($feed,$uri,$q) = ($self->feed, $self->uri,$self->q); |
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die "no uri" unless ($uri); |
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die "feed is not a Grep::Model::Feed but ", ref $feed unless $feed->isa('Grep::Model::Feed'); |
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sub mech_warn { |
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my $m = shift || return; |
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warn $m; |
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} |
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my $mech = WWW::Mechanize->new( |
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cookie_jar => {}, |
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onwarn => \&mech_warn, |
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onerror => \&mech_warn, |
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); |
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$mech->get( $uri ); |
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$self->save( 'get.html', $mech->content ); |
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if ( my $form = $args->{submit_form} ) { |
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$self->log->debug("submit form on $uri with ", dump( $form )); |
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$mech->submit_form( %$form ) or die "can't submit form ", dump( $form ); |
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$self->save( 'submit.html', $mech->content ); |
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} |
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$self->log->debug("parse result page"); |
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my $tree = HTML::TreeBuilder->new or die "can't create html tree"; |
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$tree->parse( $mech->content ) or die "can't parse fetched content"; |
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my $div = $self->element_by_triplet( |
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tree => $tree, |
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templates => $args->{wrapper}, |
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message => 'wrapper for all results', |
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fatal => 1 |
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); |
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my $max = 15; |
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my $nr = 1; |
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my $base_uri = $uri; |
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$base_uri =~ s!\?.*$!!; |
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my @r = $self->element_by_triplet( |
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tree => $tree, |
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templates => $args->{results}, |
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message => 'result element', |
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); |
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foreach my $dt ( @r ) { |
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my $a = $dt->look_down( '_tag', 'a', sub { $_[0]->attr('href') } ); |
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if ( $a ) { |
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my $href = $a->attr('href') or die "can't find href inside <", $args->{results}, ">"; |
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my $page_uri = URI->new_abs( $a->attr('href'), $base_uri ); |
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$page_uri->query( undef ); |
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$page_uri = $page_uri->canonical; |
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$self->log->debug("fetching page: ",$a->as_text," from $page_uri"); |
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if ( $mech->follow_link( url => $a->attr('href') ) ) { |
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$self->save( "page-${nr}.html", $mech->content ); |
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my $page_tree = HTML::TreeBuilder->new or die "can't create page tree"; |
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$page_tree->parse( $mech->content ) or die "can't parse page at $page_uri"; |
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$div = $self->element_by_triplet( |
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tree => $page_tree, |
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message => "result $nr", |
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templates => $args->{scrape} |
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); |
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$self->add_record( |
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in_feed => $feed, |
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title => $mech->title, |
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link => $page_uri, |
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content => $div->as_HTML, |
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# summary => |
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# category => |
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# author => |
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# issued => |
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# modified => |
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) if ( $div ); |
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$mech->back; |
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$page_tree->delete; |
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|
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} else { |
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warn "can't follow uri $page_uri: $!\n"; |
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} |
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} else { |
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$self->log->debug("result $nr doesn't have link inside, ignoring..."); |
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} |
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last if ($nr == $max); |
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$nr++; |
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} |
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$tree->delete; # clear memory! |
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|
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} |
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=head2 save |
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save( 'name', $content ); |
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Save dumps into C</tmp/grep> if writable |
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=cut |
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sub save { |
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my $self = shift; |
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my ( $file, $content ) = @_; |
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return unless ( defined($file) && defined($content) ); |
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if ( -w '/tmp/grep' ) { |
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open(my $f, '>', "/tmp/grep/$file") or die "can't open $file: $!"; |
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print $f $content or die "can't write to $file: $!"; |
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close $f or die "can't close $file: $!"; |
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$self->log->debug("saved $file ",length($content)," bytes"); |
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} |
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} |
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