/[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 30 by dpavlin,
Thu Jan  5 15:33:48 2006 UTC
+revision 116 by dpavlin,
Sun Mar 12 18:43:24 2006 UTC
 Line 4 
 use 5.008;
  use strict;
  use warnings;
- our $VERSION = '0.00';
+ our $VERSION = '0.05_1';
  =head1 NAME
 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 25 
 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
-Line 37 
 Remove multiple whitespaces from string,
+Line 100 
 Remove multiple whitespaces from string,
  =cut
  sub _s {
-         my $text = $_[1] || return;
+         my $text = $_[1];
+         return unless defined($text);
          $text =~ s/\s\s+/ /gs;
          $text =~ s/^\s+//;
          $text =~ s/\s+$//;
-Line 56 
 our @ISA = qw/Search::Estraier/;
+Line 120 
 our @ISA = qw/Search::Estraier/;
  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.
-Line 101 
 sub new {
+Line 166 
 sub new {
                          } elsif ($line =~ m/^$/) {
                                  $in_text = 1;
                                  next;
-                         } elsif ($line =~ m/^(.+)=(.+)$/) {
+                         } elsif ($line =~ m/^(.+)=(.*)$/) {
                                  $self->{attrs}->{ $1 } = $2;
                                  next;
                          }
-                         warn "draft ignored: $line\n";
+                         warn "draft ignored: '$line'\n";
                  }
          }
-Line 175 
 sub add_hidden_text {
+Line 240 
 sub add_hidden_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 188 
 sub id {
+Line 254 
 sub id {
          return $self->{id};
  }
  =head2 attr_names
  Returns array with attribute names from document object.
-Line 198 
 Returns array with attribute names from
+Line 265 
 Returns array with attribute names from
  sub attr_names {
          my $self = shift;
-         croak "attr_names return array, not scalar" if (! wantarray);
+         return unless ($self->{attrs});
+         #croak "attr_names return array, not scalar" if (! wantarray);
          return sort keys %{ $self->{attrs} };
  }
-Line 214 
 Returns value of an attribute.
+Line 282 
 Returns value of an attribute.
  sub attr {
          my $self = shift;
          my $name = shift;
+         return unless (defined($name) && $self->{attrs});
-         return $self->{'attrs'}->{ $name };
+         return $self->{attrs}->{ $name };
  }
-Line 229 
 Returns array with text sentences.
+Line 297 
 Returns array with text sentences.
  sub texts {
          my $self = shift;
-         confess "texts return array, not scalar" if (! wantarray);
+         #confess "texts return array, not scalar" if (! wantarray);
-         return @{ $self->{dtexts} };
+         return @{ $self->{dtexts} } if ($self->{dtexts});
  }
  =head2 cat_texts
  Return whole text as single scalar.
-Line 243 
 Return whole text as single scalar.
+Line 312 
 Return whole text as single scalar.
  sub cat_texts {
          my $self = shift;
-         return join(' ',@{ $self->{dtexts} });
+         return join(' ',@{ $self->{dtexts} }) if ($self->{dtexts});
  }
  =head2 dump_draft
  Dump draft data from document object.
-Line 259 
 sub dump_draft {
+Line 329 
 sub dump_draft {
          my $draft;
          foreach my $attr_name (sort keys %{ $self->{attrs} }) {
-                 $draft .= $attr_name . '=' . $self->{attrs}->{$attr_name} . "\n";
+                 next unless defined(my $v = $self->{attrs}->{$attr_name});
+                 $draft .= $attr_name . '=' . $v . "\n";
          }
          if ($self->{kwords}) {
-Line 272 
 sub dump_draft {
+Line 343 
 sub dump_draft {
          $draft .= "\n";
-         $draft .= join("\n", @{ $self->{dtexts} }) . "\n";
+         $draft .= join("\n", @{ $self->{dtexts} }) . "\n" if ($self->{dtexts});
-         $draft .= "\t" . join("\n\t", @{ $self->{htexts} }) . "\n";
+         $draft .= "\t" . join("\n\t", @{ $self->{htexts} }) . "\n" if ($self->{htexts});
          return $draft;
  }
  =head2 delete
  Empty document object
-Line 306 
 sub delete {
+Line 378 
 sub delete {
  package Search::Estraier::Condition;
- use Carp qw/confess croak/;
+ use Carp qw/carp confess croak/;
  use Search::Estraier;
  our @ISA = qw/Search::Estraier/;
-Line 330 
 sub new {
+Line 402 
 sub new {
          $self ? return $self : return undef;
  }
  =head2 set_phrase
    $cond->set_phrase('search phrase');
-Line 341 
 sub set_phrase {
+Line 414 
 sub set_phrase {
          $self->{phrase} = $self->_s( shift );
  }
  =head2 add_attr
    $cond->add_attr('@URI STRINC /~dpavlin/');
-Line 353 
 sub add_attr {
+Line 427 
 sub add_attr {
          push @{ $self->{attrs} }, $self->_s( $attr );
  }
  =head2 set_order
    $cond->set_order('@mdate NUMD');
-Line 364 
 sub set_order {
+Line 439 
 sub set_order {
          $self->{order} = shift;
  }
  =head2 set_max
    $cond->set_max(42);
-Line 373 
 sub set_order {
+Line 449 
 sub set_order {
  sub set_max {
          my $self = shift;
          my $max = shift;
-         croak "set_max needs number" unless ($max =~ m/^\d+$/);
+         croak "set_max needs number, not '$max'" unless ($max =~ m/^\d+$/);
          $self->{max} = $max;
  }
  =head2 set_options
-   $cond->set_options( SURE => 1 );
+   $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 = {
-         # check N-gram keys skipping by three
          SURE => 1 << 0,
-         # check N-gram keys skipping by two
          USUAL => 1 << 1,
-         # without TF-IDF tuning
          FAST => 1 << 2,
-         # with the simplified phrase
          AGITO => 1 << 3,
-         # check every N-gram key
          NOIDF => 1 << 4,
-         # check N-gram keys skipping by one
          SIMPLE => 1 << 10,
  };
  sub set_options {
          my $self = shift;
-         my $option = shift;
+         my $opt = 0;
-         confess "unknown option" unless ($options->{$option});
+         foreach my $option (@_) {
-         $self->{options} ||= $options->{$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.
-Line 418 
 sub phrase {
+Line 537 
 sub phrase {
          return $self->{phrase};
  }
  =head2 order
  Return search result order.
-Line 431 
 sub order {
+Line 551 
 sub order {
          return $self->{order};
  }
  =head2 attrs
  Return search result attrs.
-Line 442 
 Return search result attrs.
+Line 563 
 Return search result attrs.
  sub attrs {
          my $self = shift;
          #croak "attrs return array, not scalar" if (! wantarray);
-         return @{ $self->{attrs} };
+         return @{ $self->{attrs} } if ($self->{attrs});
  }
  =head2 max
  Return maximum number of results.
-Line 460 
 sub max {
+Line 582 
 sub max {
          return $self->{max};
  }
  =head2 options
  Return options for this condition.
-Line 476 
 sub options {
+Line 599 
 sub options {
  }
+ =head2 set_skip
+ Set number of skipped documents from beginning of results
+   $cond->set_skip(42);
+ Similar to C<offset> in RDBMS.
+ =cut
+ sub set_skip {
+         my $self = shift;
+         $self->{skip} = shift;
+ }
+ =head2 skip
+ Return skip for this condition.
+   print $cond->skip;
+ =cut
+ sub skip {
+         my $self = shift;
+         return $self->{skip};
+ }
  package Search::Estraier::ResultDocument;
  use Carp qw/croak/;
-Line 504 
 sub new {
+Line 656 
 sub new {
          my $self = {@_};
          bless($self, $class);
-         foreach my $f (qw/uri attrs snippet keywords/) {
+         croak "missing uri for ResultDocument" unless defined($self->{uri});
-                 croak "missing $f for ResultDocument" unless defined($self->{$f});
-         }
          $self ? return $self : return undef;
  }
  =head2 uri
  Return URI of result document
-Line 539 
 sub attr_names {
+Line 690 
 sub attr_names {
          return sort keys %{ $self->{attrs} };
  }
  =head2 attr
  Returns value of an attribute.
-Line 553 
 sub attr {
+Line 705 
 sub attr {
          return $self->{attrs}->{ $name };
  }
  =head2 snippet
  Return snippet from result document
-Line 566 
 sub snippet {
+Line 719 
 sub snippet {
          return $self->{snippet};
  }
  =head2 keywords
  Return keywords from result document
-Line 610 
 sub new {
+Line 764 
 sub new {
          $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}};
+         return $#{$self->{docs}} + 1;
  }
  =head2 get_doc
  Return single document
-Line 636 
 Returns undef if document doesn't exist.
+Line 795 
 Returns undef if document doesn't exist.
  sub get_doc {
          my $self = shift;
          my $num = shift;
-         croak "expect number as argument" unless ($num =~ m/^\d+$/);
+         croak "expect number as argument, not '$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 $rec->hint( 'VERSION' );
+   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>.
-Line 658 
 sub hint {
+Line 818 
 sub hint {
          return $self->{hints}->{$key};
  }
+ =head2 hints
+ 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/croak/;
+ 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
-Line 669 
 use Carp qw/croak/;
+Line 864 
 use Carp qw/croak/;
    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 $self = {
                  pxport => -1,
-                 timeout => -1,
+                 timeout => 0,   # this used to be -1
-                 dnum => -1,
-                 wnum => -1,
-                 size => -1.0,
                  wwidth => 480,
                  hwidth => 96,
                  awidth => 96,
                  status => -1,
          };
          bless($self, $class);
+         if ($#_ == 0) {
+                 $self->{url} = shift;
+         } else {
+                 my $args = {@_};
+                 %$self = ( %$self, @_ );
+                 warn "## Node debug on\n" if ($self->{debug});
+         }
+         $self->{inform} = {
+                 dnum => -1,
+                 wnum => -1,
+                 size => -1.0,
+         };
          $self ? return $self : return undef;
  }
  =head2 set_url
  Specify URL to node server
-Line 702 
 sub set_url {
+Line 944 
 sub set_url {
          $self->{url} = shift;
  }
  =head2 set_proxy
  Specify proxy server to connect to node server
-Line 713 
 Specify proxy server to connect to node
+Line 956 
 Specify proxy server to connect to node
  sub set_proxy {
          my $self = shift;
          my ($host,$port) = @_;
-         croak "proxy port must be number" unless ($port =~ m/^\d+$/);
+         croak "proxy port must be number, not '$port'" unless ($port =~ m/^\d+$/);
          $self->{pxhost} = $host;
          $self->{pxport} = $port;
  }
  =head2 set_timeout
  Specify timeout of connection in seconds
-Line 729 
 Specify timeout of connection in seconds
+Line 973 
 Specify timeout of connection in seconds
  sub set_timeout {
          my $self = shift;
          my $sec = shift;
-         croak "timeout must be number" unless ($sec =~ m/^\d+$/);
+         croak "timeout must be number, not '$sec'" unless ($sec =~ m/^\d+$/);
          $self->{timeout} = $sec;
  }
- package Search::Estraier::Master;
- use Carp;
+ =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' );
+ This method won't croak, even if using C<croak_on_error>.
+ =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, croak_on_error => 0 );
+ }
+ =head2 _fetch_doc
- =head1 Search::Estraier::Master
+ Private function used for implementing of C<get_doc>, C<get_doc_by_uri>,
+ C<etch_doc>, C<etch_doc_by_uri>.
- Controll node master. This requires user with administration priviledges.
+  # 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 {
-         package RequestAgent;
+         my $self = shift;
-         our @ISA = qw(LWP::UserAgent);
+         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.";
+         }
-         sub new {
+         if ($a->{attr}) {
-                 my $self = LWP::UserAgent::new(@_);
+                 $path = '/get_doc_attr';
-                 $self->agent("Search-Estraier/$Search::Estraer::VERSION");
+                 $arg .= '&attr=' . uri_escape($a->{attr});
-                 $self;
+                 $a->{chomp_resbody} = 1;
          }
-         sub get_basic_credentials {
+         my $rv = $self->shuttle_url( $self->{url} . $path,
-                 my($self, $realm, $uri) = @_;
+                 'application/x-www-form-urlencoded',
- #               return ($user, $password);
+                 $arg,
+                 \$resbody,
+                 $a->{croak_on_error},
+         );
+         return if ($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
- =head2 new
+   my $node_name = $node->name;
- Create new connection to node master.
+ =cut
-   my $master = new Search::Estraier::Master(
+ sub name {
-         url => 'http://localhost:1978',
+         my $self = shift;
-         user => 'admin',
+         $self->_set_info unless ($self->{inform}->{name});
-         passwd => 'admin',
+         return $self->{inform}->{name};
-   );
+ }
+ =head2 label
+   my $node_label = $node->label;
  =cut
- sub new {
+ sub label {
-         my $class = shift;
+         my $self = shift;
-         my $self = {@_};
+         $self->_set_info unless ($self->{inform}->{label});
-         bless($self, $class);
+         return $self->{inform}->{label};
+ }
-         foreach my $p (qw/url user passwd/) {
+ =head2 doc_num
-                 croak "need $p" unless ($self->{$p});
+   my $documents_in_node = $node->doc_num;
+ =cut
+ sub doc_num {
+         my $self = shift;
+         $self->_set_info if ($self->{inform}->{dnum} < 0);
+         return $self->{inform}->{dnum};
+ }
+ =head2 word_num
+   my $words_in_node = $node->word_num;
+ =cut
+ sub word_num {
+         my $self = shift;
+         $self->_set_info if ($self->{inform}->{wnum} < 0);
+         return $self->{inform}->{wnum};
+ }
+ =head2 size
+   my $node_size = $node->size;
+ =cut
+ sub size {
+         my $self = shift;
+         $self->_set_info if ($self->{inform}->{size} < 0);
+         return $self->{inform}->{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;
+                 }
          }
-         $self ? return $self : return undef;
+         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};
+         push @args, 'skip=' . $self->{skip} if ($cond->{skip});
+         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, $croak_on_error) = @_;
+         $croak_on_error = $self->{croak_on_error} unless defined($croak_on_error);
+         $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 (! $res->is_success) {
+                 if ($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);
+         if ($self->shuttle_url( $self->{url} . '/_set_link',
+                 'application/x-www-form-urlencoded',
+                 $reqbody,
+                 undef
+         ) == 200) {
+                 # refresh node info after adding link
+                 $self->_set_info;
+                 return 1;
+         }
+ }
+ =head2 admins
+  my @admins = @{ $node->admins };
+ Return array of users with admin rights on node
+ =cut
+ sub admins {
+         my $self = shift;
+         $self->_set_info unless ($self->{inform}->{name});
+         return $self->{inform}->{admins};
+ }
+ =head2 guests
+  my @guests = @{ $node->guests };
+ Return array of users with guest rights on node
+ =cut
+ sub guests {
+         my $self = shift;
+         $self->_set_info unless ($self->{inform}->{name});
+         return $self->{inform}->{guests};
+ }
+ =head2 links
+  my $links = @{ $node->links };
+ Return array of links for this node
+ =cut
+ sub links {
+         my $self = shift;
+         $self->_set_info unless ($self->{inform}->{name});
+         return $self->{inform}->{links};
+ }
+ =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 || !$resbody);
+         my @lines = split(/[\r\n]/,$resbody);
+         $self->{inform} = {};
+         ( $self->{inform}->{name}, $self->{inform}->{label}, $self->{inform}->{dnum},
+                 $self->{inform}->{wnum}, $self->{inform}->{size} ) = split(/\t/, shift @lines, 5);
+         return $resbody unless (@lines);
+         shift @lines;
+         while(my $admin = shift @lines) {
+                 push @{$self->{inform}->{admins}}, $admin;
+         }
+         while(my $guest = shift @lines) {
+                 push @{$self->{inform}->{guests}}, $guest;
+         }
+         while(my $link = shift @lines) {
+                 push @{$self->{inform}->{links}}, $link;
+         }
+         return $resbody;
+ }
  ###

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+Added in v.116

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