/[Search-Estraier]/trunk/lib/Search/Estraier.pm

This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!

Diff of /trunk/lib/Search/Estraier.pm

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-revision 6 by dpavlin,
Wed Jan  4 14:48:11 2006 UTC
+revision 102 by dpavlin,
Sat Jan 28 19:46:20 2006 UTC
 Line 4 
 use 5.008;
  use strict;
  use warnings;
- require Exporter;
+ our $VERSION = '0.04_1';
- our @ISA = qw(Exporter);
- our %EXPORT_TAGS = ( 'all' => [ qw(
- ) ] );
- our @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } );
- our @EXPORT = qw(
- );
- our $VERSION = '0.00';
- use Carp;
  =head1 NAME
-Line 26 
 Search::Estraier - pure perl module to u
+Line 12 
 Search::Estraier - pure perl module to u
  =head1 SYNOPSIS
-   use Search::Estraier;
+ =head2 Simple indexer
-   my $est = new Search::Estraier();
+         use Search::Estraier;
+         # create and configure node
+         my $node = new Search::Estraier::Node(
+                 url => 'http://localhost:1978/node/test',
+                 user => 'admin',
+                 passwd => 'admin'
+         );
+         # create document
+         my $doc = new Search::Estraier::Document;
+         # add attributes
+         $doc->add_attr('@uri', "http://estraier.gov/example.txt");
+         $doc->add_attr('@title', "Over the Rainbow");
+         # add body text to document
+         $doc->add_text("Somewhere over the rainbow.  Way up high.");
+         $doc->add_text("There's a land that I heard of once in a lullaby.");
+         die "error: ", $node->status,"\n" unless (eval { $node->put_doc($doc) });
+ =head2 Simple searcher
+         use Search::Estraier;
+         # create and configure node
+         my $node = new Search::Estraier::Node(
+                 url => 'http://localhost:1978/node/test',
+                 user => 'admin',
+                 passwd => 'admin',
+                 croak_on_error => 1,
+         );
+         # create condition
+         my $cond = new Search::Estraier::Condition;
+         # set search phrase
+         $cond->set_phrase("rainbow AND lullaby");
+         my $nres = $node->search($cond, 0);
+         if (defined($nres)) {
+                 print "Got ", $nres->hits, " results\n";
+                 # for each document in results
+                 for my $i ( 0 ... $nres->doc_num - 1 ) {
+                         # get result document
+                         my $rdoc = $nres->get_doc($i);
+                         # display attribte
+                         print "URI: ", $rdoc->attr('@uri'),"\n";
+                         print "Title: ", $rdoc->attr('@title'),"\n";
+                         print $rdoc->snippet,"\n";
+                 }
+         } else {
+                 die "error: ", $node->status,"\n";
+         }
  =head1 DESCRIPTION
-Line 39 
 or Hyper Estraier development files on t
+Line 82 
 or Hyper Estraier development files on t
  It is implemented as multiple packages which closly resamble Ruby
  implementation. It also includes methods to manage nodes.
+ There are few examples in C<scripts> directory of this distribution.
+ =cut
+ =head1 Inheritable common methods
+ This methods should really move somewhere else.
+ =head2 _s
+ Remove multiple whitespaces from string, as well as whitespaces at beginning or end
+  my $text = $self->_s(" this  is a text  ");
+  $text = 'this is a text';
  =cut
+ sub _s {
+         my $text = $_[1];
+         return unless defined($text);
+         $text =~ s/\s\s+/ /gs;
+         $text =~ s/^\s+//;
+         $text =~ s/\s+$//;
+         return $text;
+ }
  package Search::Estraier::Document;
+ use Carp qw/croak confess/;
+ use Search::Estraier;
+ our @ISA = qw/Search::Estraier/;
  =head1 Search::Estraier::Document
- Document for HyperEstraier
+ This class implements Document which is collection of attributes
+ (key=value), vectors (also key value) display text and hidden text.
  =head2 new
+ Create new document, empty or from draft.
    my $doc = new Search::HyperEstraier::Document;
+   my $doc2 = new Search::HyperEstraier::Document( $draft );
  =cut
  sub new {
          my $class = shift;
-         my $self = {@_};
+         my $self = {};
          bless($self, $class);
          $self->{id} = -1;
+         my $draft = shift;
+         if ($draft) {
+                 my $in_text = 0;
+                 foreach my $line (split(/\n/, $draft)) {
+                         if ($in_text) {
+                                 if ($line =~ /^\t/) {
+                                         push @{ $self->{htexts} }, substr($line, 1);
+                                 } else {
+                                         push @{ $self->{dtexts} }, $line;
+                                 }
+                                 next;
+                         }
+                         if ($line =~ m/^%VECTOR\t(.+)$/) {
+                                 my @fields = split(/\t/, $1);
+                                 for my $i ( 0 .. ($#fields - 1) ) {
+                                         $self->{kwords}->{ $fields[ $i ] } = $fields[ $i + 1 ];
+                                         $i++;
+                                 }
+                                 next;
+                         } elsif ($line =~ m/^%/) {
+                                 # What is this? comment?
+                                 #warn "$line\n";
+                                 next;
+                         } elsif ($line =~ m/^$/) {
+                                 $in_text = 1;
+                                 next;
+                         } elsif ($line =~ m/^(.+)=(.*)$/) {
+                                 $self->{attrs}->{ $1 } = $2;
+                                 next;
+                         }
+                         warn "draft ignored: '$line'\n";
+                 }
+         }
          $self ? return $self : return undef;
  }
-Line 70 
 Add an attribute.
+Line 185 
 Add an attribute.
    $doc->add_attr( name => 'value' );
- B<FIXME>: delete attribute using
+ Delete attribute using
    $doc->add_attr( name => undef );
-Line 81 
 sub add_attr {
+Line 196 
 sub add_attr {
          my $attrs = {@_};
          while (my ($name, $value) = each %{ $attrs }) {
-                 push @{ $self->{attrs}->{_s($name)} }, _s($value);
+                 if (! defined($value)) {
+                         delete( $self->{attrs}->{ $self->_s($name) } );
+                 } else {
+                         $self->{attrs}->{ $self->_s($name) } = $self->_s($value);
+                 }
          }
+         return 1;
  }
-Line 99 
 sub add_text {
+Line 220 
 sub add_text {
          my $text = shift;
          return unless defined($text);
-         push @{ $self->{dtexts} }, _s($text);
+         push @{ $self->{dtexts} }, $self->_s($text);
  }
-Line 116 
 sub add_hidden_text {
+Line 237 
 sub add_hidden_text {
          my $text = shift;
          return unless defined($text);
-         push @{ $self->{htexts} }, _s($text);
+         push @{ $self->{htexts} }, $self->_s($text);
  }
  =head2 id
  Get the ID number of document. If the object has never been registred, C<-1> is returned.
-Line 132 
 sub id {
+Line 254 
 sub id {
          return $self->{id};
  }
+ =head2 attr_names
+ Returns array with attribute names from document object.
+   my @attrs = $doc->attr_names;
+ =cut
+ sub attr_names {
+         my $self = shift;
+         return unless ($self->{attrs});
+         #croak "attr_names return array, not scalar" if (! wantarray);
+         return sort keys %{ $self->{attrs} };
+ }
+ =head2 attr
+ Returns value of an attribute.
+   my $value = $doc->attr( 'attribute' );
+ =cut
+ sub attr {
+         my $self = shift;
+         my $name = shift;
+         return unless (defined($name) && $self->{attrs});
+         return $self->{attrs}->{ $name };
+ }
+ =head2 texts
+ Returns array with text sentences.
+   my @texts = $doc->texts;
+ =cut
+ sub texts {
+         my $self = shift;
+         #confess "texts return array, not scalar" if (! wantarray);
+         return @{ $self->{dtexts} } if ($self->{dtexts});
+ }
+ =head2 cat_texts
+ Return whole text as single scalar.
+  my $text = $doc->cat_texts;
+ =cut
+ sub cat_texts {
+         my $self = shift;
+         return join(' ',@{ $self->{dtexts} }) if ($self->{dtexts});
+ }
  =head2 dump_draft
+ Dump draft data from document object.
    print $doc->dump_draft;
  =cut
  sub dump_draft {
+         my $self = shift;
+         my $draft;
+         foreach my $attr_name (sort keys %{ $self->{attrs} }) {
+                 next unless defined(my $v = $self->{attrs}->{$attr_name});
+                 $draft .= $attr_name . '=' . $v . "\n";
+         }
+         if ($self->{kwords}) {
+                 $draft .= '%%VECTOR';
+                 while (my ($key, $value) = each %{ $self->{kwords} }) {
+                         $draft .= "\t$key\t$value";
+                 }
+                 $draft .= "\n";
+         }
+         $draft .= "\n";
+         $draft .= join("\n", @{ $self->{dtexts} }) . "\n" if ($self->{dtexts});
+         $draft .= "\t" . join("\n\t", @{ $self->{htexts} }) . "\n" if ($self->{htexts});
+         return $draft;
  }
  =head2 delete
  Empty document object
    $doc->delete;
+ This function is addition to original Ruby API, and since it was included in C wrappers it's here as a
+ convinience. Document objects which go out of scope will be destroyed
+ automatically.
  =cut
  sub delete {
          my $self = shift;
-         foreach my $data (qw/attrs dtexts stexts/) {
+         foreach my $data (qw/attrs dtexts stexts kwords/) {
                  delete($self->{$data});
          }
+         $self->{id} = -1;
          return 1;
  }
- =head2 _s
- Remove multiple whitespaces from string, as well as whitespaces at beginning or end
+ package Search::Estraier::Condition;
-  my $text = _s(" this  is a text  ");
+ use Carp qw/carp confess croak/;
-  $text = 'this is a text';
+ use Search::Estraier;
+ our @ISA = qw/Search::Estraier/;
+ =head1 Search::Estraier::Condition
+ =head2 new
+   my $cond = new Search::HyperEstraier::Condition;
  =cut
- sub _s {
+ sub new {
-         my $text = shift || return;
+         my $class = shift;
-         $text =~ s/\s\s+/ /gs;
+         my $self = {};
-         $text =~ s/^\s+//;
+         bless($self, $class);
-         $text =~ s/\s+$//;
-         return $text;
+         $self->{max} = -1;
+         $self->{options} = 0;
+         $self ? return $self : return undef;
  }
+ =head2 set_phrase
- package Search::Estraier::Master;
+   $cond->set_phrase('search phrase');
+ =cut
+ sub set_phrase {
+         my $self = shift;
+         $self->{phrase} = $self->_s( shift );
+ }
- use Carp;
- =head1 Search::Estraier::Master
+ =head2 add_attr
- Controll node master. This requires user with administration priviledges.
+   $cond->add_attr('@URI STRINC /~dpavlin/');
  =cut
- {
+ sub add_attr {
-         package RequestAgent;
+         my $self = shift;
-         @ISA = qw(LWP::UserAgent);
+         my $attr = shift || return;
+         push @{ $self->{attrs} }, $self->_s( $attr );
+ }
-         sub new {
-                 my $self = LWP::UserAgent::new(@_);
-                 $self->agent("Search-Estraier/$Search::Estraer::VERSION");
-                 $self;
-         }
-         sub get_basic_credentials {
+ =head2 set_order
-                 my($self, $realm, $uri) = @_;
- #               return ($user, $password);
+   $cond->set_order('@mdate NUMD');
+ =cut
+ sub set_order {
+         my $self = shift;
+         $self->{order} = shift;
+ }
+ =head2 set_max
+   $cond->set_max(42);
+ =cut
+ sub set_max {
+         my $self = shift;
+         my $max = shift;
+         croak "set_max needs number, not '$max'" unless ($max =~ m/^\d+$/);
+         $self->{max} = $max;
+ }
+ =head2 set_options
+   $cond->set_options( 'SURE' );
+   $cond->set_options( qw/AGITO NOIDF SIMPLE/ );
+ Possible options are:
+ =over 8
+ =item SURE
+ check every N-gram
+ =item USUAL
+ check every second N-gram
+ =item FAST
+ check every third N-gram
+ =item AGITO
+ check every fourth N-gram
+ =item NOIDF
+ don't perform TF-IDF tuning
+ =item SIMPLE
+ use simplified query phrase
+ =back
+ Skipping N-grams will speed up search, but reduce accuracy. Every call to C<set_options> will reset previous
+ options;
+ This option changed in version C<0.04> of this module. It's backwards compatibile.
+ =cut
+ my $options = {
+         SURE => 1 << 0,
+         USUAL => 1 << 1,
+         FAST => 1 << 2,
+         AGITO => 1 << 3,
+         NOIDF => 1 << 4,
+         SIMPLE => 1 << 10,
+ };
+ sub set_options {
+         my $self = shift;
+         my $opt = 0;
+         foreach my $option (@_) {
+                 my $mask;
+                 unless ($mask = $options->{$option}) {
+                         if ($option eq '1') {
+                                 next;
+                         } else {
+                                 croak "unknown option $option";
+                         }
+                 }
+                 $opt += $mask;
          }
+         $self->{options} = $opt;
+ }
+ =head2 phrase
+ Return search phrase.
+   print $cond->phrase;
+ =cut
+ sub phrase {
+         my $self = shift;
+         return $self->{phrase};
+ }
+ =head2 order
+ Return search result order.
+   print $cond->order;
+ =cut
+ sub order {
+         my $self = shift;
+         return $self->{order};
+ }
+ =head2 attrs
+ Return search result attrs.
+   my @cond_attrs = $cond->attrs;
+ =cut
+ sub attrs {
+         my $self = shift;
+         #croak "attrs return array, not scalar" if (! wantarray);
+         return @{ $self->{attrs} } if ($self->{attrs});
+ }
+ =head2 max
+ Return maximum number of results.
+   print $cond->max;
+ C<-1> is returned for unitialized value, C<0> is unlimited.
+ =cut
+ sub max {
+         my $self = shift;
+         return $self->{max};
  }
+ =head2 options
+ Return options for this condition.
+   print $cond->options;
+ Options are returned in numerical form.
+ =cut
+ sub options {
+         my $self = shift;
+         return $self->{options};
+ }
+ package Search::Estraier::ResultDocument;
+ use Carp qw/croak/;
+ #use Search::Estraier;
+ #our @ISA = qw/Search::Estraier/;
+ =head1 Search::Estraier::ResultDocument
  =head2 new
- Create new connection to node master.
+   my $rdoc = new Search::HyperEstraier::ResultDocument(
+         uri => 'http://localhost/document/uri/42',
+         attrs => {
+                 foo => 1,
+                 bar => 2,
+         },
+         snippet => 'this is a text of snippet'
+         keywords => 'this\tare\tkeywords'
+   );
+ =cut
+ sub new {
+         my $class = shift;
+         my $self = {@_};
+         bless($self, $class);
+         croak "missing uri for ResultDocument" unless defined($self->{uri});
+         $self ? return $self : return undef;
+ }
+ =head2 uri
+ Return URI of result document
+   print $rdoc->uri;
+ =cut
+ sub uri {
+         my $self = shift;
+         return $self->{uri};
+ }
+ =head2 attr_names
+ Returns array with attribute names from result document object.
+   my @attrs = $rdoc->attr_names;
+ =cut
+ sub attr_names {
+         my $self = shift;
+         croak "attr_names return array, not scalar" if (! wantarray);
+         return sort keys %{ $self->{attrs} };
+ }
+ =head2 attr
+ Returns value of an attribute.
+   my $value = $rdoc->attr( 'attribute' );
+ =cut
+ sub attr {
+         my $self = shift;
+         my $name = shift || return;
+         return $self->{attrs}->{ $name };
+ }
+ =head2 snippet
+ Return snippet from result document
+   print $rdoc->snippet;
+ =cut
+ sub snippet {
+         my $self = shift;
+         return $self->{snippet};
+ }
+ =head2 keywords
+ Return keywords from result document
+   print $rdoc->keywords;
-   my $master = new Search::Estraier::Master(
+ =cut
-         url => 'http://localhost:1978',
-         user => 'admin',
+ sub keywords {
-         passwd => 'admin',
+         my $self = shift;
+         return $self->{keywords};
+ }
+ package Search::Estraier::NodeResult;
+ use Carp qw/croak/;
+ #use Search::Estraier;
+ #our @ISA = qw/Search::Estraier/;
+ =head1 Search::Estraier::NodeResult
+ =head2 new
+   my $res = new Search::HyperEstraier::NodeResult(
+         docs => @array_of_rdocs,
+         hits => %hash_with_hints,
    );
  =cut
-Line 224 
 sub new {
+Line 728 
 sub new {
          my $self = {@_};
          bless($self, $class);
-         foreach my $p (qw/url user passwd/) {
+         foreach my $f (qw/docs hints/) {
-                 croak "need $p" unless ($self->{$p});
+                 croak "missing $f for ResultDocument" unless defined($self->{$f});
+         }
+         $self ? return $self : return undef;
+ }
+ =head2 doc_num
+ Return number of documents
+   print $res->doc_num;
+ This will return real number of documents (limited by C<max>).
+ If you want to get total number of hits, see C<hits>.
+ =cut
+ sub doc_num {
+         my $self = shift;
+         return $#{$self->{docs}} + 1;
+ }
+ =head2 get_doc
+ Return single document
+   my $doc = $res->get_doc( 42 );
+ Returns undef if document doesn't exist.
+ =cut
+ sub get_doc {
+         my $self = shift;
+         my $num = shift;
+         croak "expect number as argument, not '$num'" unless ($num =~ m/^\d+$/);
+         return undef if ($num < 0 || $num > $self->{docs});
+         return $self->{docs}->[$num];
+ }
+ =head2 hint
+ Return specific hint from results.
+   print $res->hint( 'VERSION' );
+ Possible hints are: C<VERSION>, C<NODE>, C<HIT>, C<HINT#n>, C<DOCNUM>, C<WORDNUM>,
+ C<TIME>, C<LINK#n>, C<VIEW>.
+ =cut
+ sub hint {
+         my $self = shift;
+         my $key = shift || return;
+         return $self->{hints}->{$key};
+ }
+ =head2 hits
+ More perlish version of C<hint>. This one returns hash.
+   my %hints = $res->hints;
+ =cut
+ sub hints {
+         my $self = shift;
+         return $self->{hints};
+ }
+ =head2 hits
+ Syntaxtic sugar for total number of hits for this query
+   print $res->hits;
+ It's same as
+   print $res->hint('HIT');
+ but shorter.
+ =cut
+ sub hits {
+         my $self = shift;
+         return $self->{hints}->{'HIT'} || 0;
+ }
+ package Search::Estraier::Node;
+ use Carp qw/carp croak confess/;
+ use URI;
+ use MIME::Base64;
+ use IO::Socket::INET;
+ use URI::Escape qw/uri_escape/;
+ =head1 Search::Estraier::Node
+ =head2 new
+   my $node = new Search::HyperEstraier::Node;
+ or optionally with C<url> as parametar
+   my $node = new Search::HyperEstraier::Node( 'http://localhost:1978/node/test' );
+ or in more verbose form
+   my $node = new Search::HyperEstraier::Node(
+         url => 'http://localhost:1978/node/test',
+         debug => 1,
+         croak_on_error => 1
+   );
+ with following arguments:
+ =over 4
+ =item url
+ URL to node
+ =item debug
+ dumps a B<lot> of debugging output
+ =item croak_on_error
+ very helpful during development. It will croak on all errors instead of
+ silently returning C<-1> (which is convention of Hyper Estraier API in other
+ languages).
+ =back
+ =cut
+ sub new {
+         my $class = shift;
+         my $self = {
+                 pxport => -1,
+                 timeout => 0,   # this used to be -1
+                 dnum => -1,
+                 wnum => -1,
+                 size => -1.0,
+                 wwidth => 480,
+                 hwidth => 96,
+                 awidth => 96,
+                 status => -1,
+         };
+         bless($self, $class);
+         if ($#_ == 0) {
+                 $self->{url} = shift;
+         } else {
+                 my $args = {@_};
+                 %$self = ( %$self, @_ );
+                 warn "## Node debug on\n" if ($self->{debug});
          }
          $self ? return $self : return undef;
  }
+ =head2 set_url
+ Specify URL to node server
+   $node->set_url('http://localhost:1978');
+ =cut
+ sub set_url {
+         my $self = shift;
+         $self->{url} = shift;
+ }
+ =head2 set_proxy
+ Specify proxy server to connect to node server
+   $node->set_proxy('proxy.example.com', 8080);
+ =cut
+ sub set_proxy {
+         my $self = shift;
+         my ($host,$port) = @_;
+         croak "proxy port must be number, not '$port'" unless ($port =~ m/^\d+$/);
+         $self->{pxhost} = $host;
+         $self->{pxport} = $port;
+ }
+ =head2 set_timeout
+ Specify timeout of connection in seconds
+   $node->set_timeout( 15 );
+ =cut
+ sub set_timeout {
+         my $self = shift;
+         my $sec = shift;
+         croak "timeout must be number, not '$sec'" unless ($sec =~ m/^\d+$/);
+         $self->{timeout} = $sec;
+ }
+ =head2 set_auth
+ Specify name and password for authentication to node server.
+   $node->set_auth('clint','eastwood');
+ =cut
+ sub set_auth {
+         my $self = shift;
+         my ($login,$passwd) = @_;
+         my $basic_auth = encode_base64( "$login:$passwd" );
+         chomp($basic_auth);
+         $self->{auth} = $basic_auth;
+ }
+ =head2 status
+ Return status code of last request.
+   print $node->status;
+ C<-1> means connection failure.
+ =cut
+ sub status {
+         my $self = shift;
+         return $self->{status};
+ }
+ =head2 put_doc
+ Add a document
+   $node->put_doc( $document_draft ) or die "can't add document";
+ Return true on success or false on failture.
+ =cut
+ sub put_doc {
+         my $self = shift;
+         my $doc = shift || return;
+         return unless ($self->{url} && $doc->isa('Search::Estraier::Document'));
+         $self->shuttle_url( $self->{url} . '/put_doc',
+                 'text/x-estraier-draft',
+                 $doc->dump_draft,
+                 undef
+         ) == 200;
+ }
+ =head2 out_doc
+ Remove a document
+   $node->out_doc( document_id ) or "can't remove document";
+ Return true on success or false on failture.
+ =cut
+ sub out_doc {
+         my $self = shift;
+         my $id = shift || return;
+         return unless ($self->{url});
+         croak "id must be number, not '$id'" unless ($id =~ m/^\d+$/);
+         $self->shuttle_url( $self->{url} . '/out_doc',
+                 'application/x-www-form-urlencoded',
+                 "id=$id",
+                 undef
+         ) == 200;
+ }
+ =head2 out_doc_by_uri
+ Remove a registrated document using it's uri
+   $node->out_doc_by_uri( 'file:///document/uri/42' ) or "can't remove document";
+ Return true on success or false on failture.
+ =cut
+ sub out_doc_by_uri {
+         my $self = shift;
+         my $uri = shift || return;
+         return unless ($self->{url});
+         $self->shuttle_url( $self->{url} . '/out_doc',
+                 'application/x-www-form-urlencoded',
+                 "uri=" . uri_escape($uri),
+                 undef
+         ) == 200;
+ }
+ =head2 edit_doc
+ Edit attributes of a document
+   $node->edit_doc( $document_draft ) or die "can't edit document";
+ Return true on success or false on failture.
+ =cut
+ sub edit_doc {
+         my $self = shift;
+         my $doc = shift || return;
+         return unless ($self->{url} && $doc->isa('Search::Estraier::Document'));
+         $self->shuttle_url( $self->{url} . '/edit_doc',
+                 'text/x-estraier-draft',
+                 $doc->dump_draft,
+                 undef
+         ) == 200;
+ }
+ =head2 get_doc
+ Retreive document
+   my $doc = $node->get_doc( document_id ) or die "can't get document";
+ Return true on success or false on failture.
+ =cut
+ sub get_doc {
+         my $self = shift;
+         my $id = shift || return;
+         return $self->_fetch_doc( id => $id );
+ }
+ =head2 get_doc_by_uri
+ Retreive document
+   my $doc = $node->get_doc_by_uri( 'file:///document/uri/42' ) or die "can't get document";
+ Return true on success or false on failture.
+ =cut
+ sub get_doc_by_uri {
+         my $self = shift;
+         my $uri = shift || return;
+         return $self->_fetch_doc( uri => $uri );
+ }
+ =head2 get_doc_attr
+ Retrieve the value of an atribute from object
+   my $val = $node->get_doc_attr( document_id, 'attribute_name' ) or
+         die "can't get document attribute";
+ =cut
+ sub get_doc_attr {
+         my $self = shift;
+         my ($id,$name) = @_;
+         return unless ($id && $name);
+         return $self->_fetch_doc( id => $id, attr => $name );
+ }
+ =head2 get_doc_attr_by_uri
+ Retrieve the value of an atribute from object
+   my $val = $node->get_doc_attr_by_uri( document_id, 'attribute_name' ) or
+         die "can't get document attribute";
+ =cut
+ sub get_doc_attr_by_uri {
+         my $self = shift;
+         my ($uri,$name) = @_;
+         return unless ($uri && $name);
+         return $self->_fetch_doc( uri => $uri, attr => $name );
+ }
+ =head2 etch_doc
+ Exctract document keywords
+   my $keywords = $node->etch_doc( document_id ) or die "can't etch document";
+ =cut
+ sub etch_doc {
+         my $self = shift;
+         my $id = shift || return;
+         return $self->_fetch_doc( id => $id, etch => 1 );
+ }
+ =head2 etch_doc_by_uri
+ Retreive document
+   my $keywords = $node->etch_doc_by_uri( 'file:///document/uri/42' ) or die "can't etch document";
+ Return true on success or false on failture.
+ =cut
+ sub etch_doc_by_uri {
+         my $self = shift;
+         my $uri = shift || return;
+         return $self->_fetch_doc( uri => $uri, etch => 1 );
+ }
+ =head2 uri_to_id
+ Get ID of document specified by URI
+   my $id = $node->uri_to_id( 'file:///document/uri/42' );
+ =cut
+ sub uri_to_id {
+         my $self = shift;
+         my $uri = shift || return;
+         return $self->_fetch_doc( uri => $uri, path => '/uri_to_id', chomp_resbody => 1 );
+ }
+ =head2 _fetch_doc
+ Private function used for implementing of C<get_doc>, C<get_doc_by_uri>,
+ C<etch_doc>, C<etch_doc_by_uri>.
+  # this will decode received draft into Search::Estraier::Document object
+  my $doc = $node->_fetch_doc( id => 42 );
+  my $doc = $node->_fetch_doc( uri => 'file:///document/uri/42' );
+  # to extract keywords, add etch
+  my $doc = $node->_fetch_doc( id => 42, etch => 1 );
+  my $doc = $node->_fetch_doc( uri => 'file:///document/uri/42', etch => 1 );
+  # to get document attrubute add attr
+  my $doc = $node->_fetch_doc( id => 42, attr => '@mdate' );
+  my $doc = $node->_fetch_doc( uri => 'file:///document/uri/42', attr => '@mdate' );
+  # more general form which allows implementation of
+  # uri_to_id
+  my $id = $node->_fetch_doc(
+         uri => 'file:///document/uri/42',
+         path => '/uri_to_id',
+         chomp_resbody => 1
+  );
+ =cut
+ sub _fetch_doc {
+         my $self = shift;
+         my $a = {@_};
+         return unless ( ($a->{id} || $a->{uri}) && $self->{url} );
+         my ($arg, $resbody);
+         my $path = $a->{path} || '/get_doc';
+         $path = '/etch_doc' if ($a->{etch});
+         if ($a->{id}) {
+                 croak "id must be numberm not '$a->{id}'" unless ($a->{id} =~ m/^\d+$/);
+                 $arg = 'id=' . $a->{id};
+         } elsif ($a->{uri}) {
+                 $arg = 'uri=' . uri_escape($a->{uri});
+         } else {
+                 confess "unhandled argument. Need id or uri.";
+         }
+         if ($a->{attr}) {
+                 $path = '/get_doc_attr';
+                 $arg .= '&attr=' . uri_escape($a->{attr});
+                 $a->{chomp_resbody} = 1;
+         }
+         my $rv = $self->shuttle_url( $self->{url} . $path,
+                 'application/x-www-form-urlencoded',
+                 $arg,
+                 \$resbody,
+         );
+         return if ($rv != 200);
+         if ($a->{etch}) {
+                 $self->{kwords} = {};
+                 return +{} unless ($resbody);
+                 foreach my $l (split(/\n/, $resbody)) {
+                         my ($k,$v) = split(/\t/, $l, 2);
+                         $self->{kwords}->{$k} = $v if ($v);
+                 }
+                 return $self->{kwords};
+         } elsif ($a->{chomp_resbody}) {
+                 return unless (defined($resbody));
+                 chomp($resbody);
+                 return $resbody;
+         } else {
+                 return new Search::Estraier::Document($resbody);
+         }
+ }
+ =head2 name
+   my $node_name = $node->name;
+ =cut
+ sub name {
+         my $self = shift;
+         $self->_set_info unless ($self->{name});
+         return $self->{name};
+ }
+ =head2 label
+   my $node_label = $node->label;
+ =cut
+ sub label {
+         my $self = shift;
+         $self->_set_info unless ($self->{label});
+         return $self->{label};
+ }
+ =head2 doc_num
+   my $documents_in_node = $node->doc_num;
+ =cut
+ sub doc_num {
+         my $self = shift;
+         $self->_set_info if ($self->{dnum} < 0);
+         return $self->{dnum};
+ }
+ =head2 word_num
+   my $words_in_node = $node->word_num;
+ =cut
+ sub word_num {
+         my $self = shift;
+         $self->_set_info if ($self->{wnum} < 0);
+         return $self->{wnum};
+ }
+ =head2 size
+   my $node_size = $node->size;
+ =cut
+ sub size {
+         my $self = shift;
+         $self->_set_info if ($self->{size} < 0);
+         return $self->{size};
+ }
+ =head2 search
+ Search documents which match condition
+   my $nres = $node->search( $cond, $depth );
+ C<$cond> is C<Search::Estraier::Condition> object, while <$depth> specifies
+ depth for meta search.
+ Function results C<Search::Estraier::NodeResult> object.
+ =cut
+ sub search {
+         my $self = shift;
+         my ($cond, $depth) = @_;
+         return unless ($cond && defined($depth) && $self->{url});
+         croak "cond mush be Search::Estraier::Condition, not '$cond->isa'" unless ($cond->isa('Search::Estraier::Condition'));
+         croak "depth needs number, not '$depth'" unless ($depth =~ m/^\d+$/);
+         my $resbody;
+         my $rv = $self->shuttle_url( $self->{url} . '/search',
+                 'application/x-www-form-urlencoded',
+                 $self->cond_to_query( $cond, $depth ),
+                 \$resbody,
+         );
+         return if ($rv != 200);
+         my (@docs, $hints);
+         my @lines = split(/\n/, $resbody);
+         return unless (@lines);
+         my $border = $lines[0];
+         my $isend = 0;
+         my $lnum = 1;
+         while ( $lnum <= $#lines ) {
+                 my $line = $lines[$lnum];
+                 $lnum++;
+                 #warn "## $line\n";
+                 if ($line && $line =~ m/^\Q$border\E(:END)*$/) {
+                         $isend = $1;
+                         last;
+                 }
+                 if ($line =~ /\t/) {
+                         my ($k,$v) = split(/\t/, $line, 2);
+                         $hints->{$k} = $v;
+                 }
+         }
+         my $snum = $lnum;
+         while( ! $isend && $lnum <= $#lines ) {
+                 my $line = $lines[$lnum];
+                 #warn "# $lnum: $line\n";
+                 $lnum++;
+                 if ($line && $line =~ m/^\Q$border\E/) {
+                         if ($lnum > $snum) {
+                                 my $rdattrs;
+                                 my $rdvector;
+                                 my $rdsnippet;
+                                 my $rlnum = $snum;
+                                 while ($rlnum < $lnum - 1 ) {
+                                         #my $rdline = $self->_s($lines[$rlnum]);
+                                         my $rdline = $lines[$rlnum];
+                                         $rlnum++;
+                                         last unless ($rdline);
+                                         if ($rdline =~ /^%/) {
+                                                 $rdvector = $1 if ($rdline =~ /^%VECTOR\t(.+)$/);
+                                         } elsif($rdline =~ /=/) {
+                                                 $rdattrs->{$1} = $2 if ($rdline =~ /^(.+)=(.+)$/);
+                                         } else {
+                                                 confess "invalid format of response";
+                                         }
+                                 }
+                                 while($rlnum < $lnum - 1) {
+                                         my $rdline = $lines[$rlnum];
+                                         $rlnum++;
+                                         $rdsnippet .= "$rdline\n";
+                                 }
+                                 #warn Dumper($rdvector, $rdattrs, $rdsnippet);
+                                 if (my $rduri = $rdattrs->{'@uri'}) {
+                                         push @docs, new Search::Estraier::ResultDocument(
+                                                 uri => $rduri,
+                                                 attrs => $rdattrs,
+                                                 snippet => $rdsnippet,
+                                                 keywords => $rdvector,
+                                         );
+                                 }
+                         }
+                         $snum = $lnum;
+                         #warn "### $line\n";
+                         $isend = 1 if ($line =~ /:END$/);
+                 }
+         }
+         if (! $isend) {
+                 warn "received result doesn't have :END\n$resbody";
+                 return;
+         }
+         #warn Dumper(\@docs, $hints);
+         return new Search::Estraier::NodeResult( docs => \@docs, hints => $hints );
+ }
+ =head2 cond_to_query
+ Return URI encoded string generated from Search::Estraier::Condition
+   my $args = $node->cond_to_query( $cond, $depth );
+ =cut
+ sub cond_to_query {
+         my $self = shift;
+         my $cond = shift || return;
+         croak "condition must be Search::Estraier::Condition, not '$cond->isa'" unless ($cond->isa('Search::Estraier::Condition'));
+         my $depth = shift;
+         my @args;
+         if (my $phrase = $cond->phrase) {
+                 push @args, 'phrase=' . uri_escape($phrase);
+         }
+         if (my @attrs = $cond->attrs) {
+                 for my $i ( 0 .. $#attrs ) {
+                         push @args,'attr' . ($i+1) . '=' . uri_escape( $attrs[$i] ) if ($attrs[$i]);
+                 }
+         }
+         if (my $order = $cond->order) {
+                 push @args, 'order=' . uri_escape($order);
+         }
+         if (my $max = $cond->max) {
+                 push @args, 'max=' . $max;
+         } else {
+                 push @args, 'max=' . (1 << 30);
+         }
+         if (my $options = $cond->options) {
+                 push @args, 'options=' . $options;
+         }
+         push @args, 'depth=' . $depth if ($depth);
+         push @args, 'wwidth=' . $self->{wwidth};
+         push @args, 'hwidth=' . $self->{hwidth};
+         push @args, 'awidth=' . $self->{awidth};
+         return join('&', @args);
+ }
+ =head2 shuttle_url
+ This is method which uses C<LWP::UserAgent> to communicate with Hyper Estraier node
+ master.
+   my $rv = shuttle_url( $url, $content_type, $req_body, \$resbody );
+ C<$resheads> and C<$resbody> booleans controll if response headers and/or response
+ body will be saved within object.
+ =cut
+ use LWP::UserAgent;
+ sub shuttle_url {
+         my $self = shift;
+         my ($url, $content_type, $reqbody, $resbody) = @_;
+         $self->{status} = -1;
+         warn "## $url\n" if ($self->{debug});
+         $url = new URI($url);
+         if (
+                         !$url || !$url->scheme || !$url->scheme eq 'http' ||
+                         !$url->host || !$url->port || $url->port < 1
+                 ) {
+                 carp "can't parse $url\n";
+                 return -1;
+         }
+         my $ua = LWP::UserAgent->new;
+         $ua->agent( "Search-Estraier/$Search::Estraier::VERSION" );
+         my $req;
+         if ($reqbody) {
+                 $req = HTTP::Request->new(POST => $url);
+         } else {
+                 $req = HTTP::Request->new(GET => $url);
+         }
+         $req->headers->header( 'Host' => $url->host . ":" . $url->port );
+         $req->headers->header( 'Connection', 'close' );
+         $req->headers->header( 'Authorization', 'Basic ' . $self->{auth} ) if ($self->{auth});
+         $req->content_type( $content_type );
+         warn $req->headers->as_string,"\n" if ($self->{debug});
+         if ($reqbody) {
+                 warn "$reqbody\n" if ($self->{debug});
+                 $req->content( $reqbody );
+         }
+         my $res = $ua->request($req) || croak "can't make request to $url: $!";
+         warn "## response status: ",$res->status_line,"\n" if ($self->{debug});
+         ($self->{status}, $self->{status_message}) = split(/\s+/, $res->status_line, 2);
+         if (! $res->is_success) {
+                 if ($self->{croak_on_error}) {
+                         croak("can't get $url: ",$res->status_line);
+                 } else {
+                         return -1;
+                 }
+         }
+         $$resbody .= $res->content;
+         warn "## response body:\n$$resbody\n" if ($resbody && $self->{debug});
+         return $self->{status};
+ }
+ =head2 set_snippet_width
+ Set width of snippets in results
+   $node->set_snippet_width( $wwidth, $hwidth, $awidth );
+ C<$wwidth> specifies whole width of snippet. It's C<480> by default. If it's C<0> snippet
+ is not sent with results. If it is negative, whole document text is sent instead of snippet.
+ C<$hwidth> specified width of strings from beginning of string. Default
+ value is C<96>. Negative or zero value keep previous value.
+ C<$awidth> specifies width of strings around each highlighted word. It's C<96> by default.
+ If negative of zero value is provided previous value is kept unchanged.
+ =cut
+ sub set_snippet_width {
+         my $self = shift;
+         my ($wwidth, $hwidth, $awidth) = @_;
+         $self->{wwidth} = $wwidth;
+         $self->{hwidth} = $hwidth if ($hwidth >= 0);
+         $self->{awidth} = $awidth if ($awidth >= 0);
+ }
+ =head2 set_user
+ Manage users of node
+   $node->set_user( 'name', $mode );
+ C<$mode> can be one of:
+ =over 4
+ =item 0
+ delete account
+ =item 1
+ set administrative right for user
+ =item 2
+ set user account as guest
+ =back
+ Return true on success, otherwise false.
+ =cut
+ sub set_user {
+         my $self = shift;
+         my ($name, $mode) = @_;
+         return unless ($self->{url});
+         croak "mode must be number, not '$mode'" unless ($mode =~ m/^\d+$/);
+         $self->shuttle_url( $self->{url} . '/_set_user',
+                 'text/plain',
+                 'name=' . uri_escape($name) . '&mode=' . $mode,
+                 undef
+         ) == 200;
+ }
+ =head2 set_link
+ Manage node links
+   $node->set_link('http://localhost:1978/node/another', 'another node label', $credit);
+ If C<$credit> is negative, link is removed.
+ =cut
+ sub set_link {
+         my $self = shift;
+         my ($url, $label, $credit) = @_;
+         return unless ($self->{url});
+         croak "mode credit be number, not '$credit'" unless ($credit =~ m/^\d+$/);
+         my $reqbody = 'url=' . uri_escape($url) . '&label=' . uri_escape($label);
+         $reqbody .= '&credit=' . $credit if ($credit > 0);
+         $self->shuttle_url( $self->{url} . '/_set_link',
+                 'application/x-www-form-urlencoded',
+                 $reqbody,
+                 undef
+         ) == 200;
+ }
+ =head1 PRIVATE METHODS
+ You could call those directly, but you don't have to. I hope.
+ =head2 _set_info
+ Set information for node
+   $node->_set_info;
+ =cut
+ sub _set_info {
+         my $self = shift;
+         $self->{status} = -1;
+         return unless ($self->{url});
+         my $resbody;
+         my $rv = $self->shuttle_url( $self->{url} . '/inform',
+                 'text/plain',
+                 undef,
+                 \$resbody,
+         );
+         return if ($rv != 200 || !$resbody);
+         # it seems that response can have multiple line endings
+         $resbody =~ s/[\r\n]+$//;
+         ( $self->{name}, $self->{label}, $self->{dnum}, $self->{wnum}, $self->{size} ) =
+                 split(/\t/, $resbody, 5);
+ }
  ###
-Line 252 
 Dobrica Pavlinusic, E<lt>dpavlin@rot13.o
+Line 1716 
 Dobrica Pavlinusic, E<lt>dpavlin@rot13.o
  =head1 COPYRIGHT AND LICENSE
- Copyright (C) 2005 by Dobrica Pavlinusic
+ Copyright (C) 2005-2006 by Dobrica Pavlinusic
  This library is free software; you can redistribute it and/or modify
  it under the GPL v2 or later.

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+Added in v.102

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