--- trunk/Estraier.pm	2006/01/05 14:30:42	23
+++ trunk/Estraier.pm	2006/01/07 16:19:31	63
@@ -4,7 +4,7 @@
 use strict;
 use warnings;
 
-our $VERSION = '0.00';
+our $VERSION = '0.01';
 
 =head1 NAME
 
@@ -27,6 +27,10 @@
 
 =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
@@ -56,6 +60,7 @@
 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.
@@ -175,6 +180,7 @@
 	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.
@@ -188,6 +194,7 @@
 	return $self->{id};
 }
 
+
 =head2 attr_names
 
 Returns array with attribute names from document object.
@@ -198,7 +205,8 @@
 
 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} };
 }
 
@@ -214,8 +222,8 @@
 sub attr {
 	my $self = shift;
 	my $name = shift;
-
-	return $self->{'attrs'}->{ $name };
+	return unless (defined($name) && $self->{attrs});
+	return $self->{attrs}->{ $name };
 }
 
 
@@ -229,10 +237,11 @@
 
 sub texts {
 	my $self = shift;
-	confess "texts return array, not scalar" if (! wantarray);
-	return @{ $self->{dtexts} };
+	#confess "texts return array, not scalar" if (! wantarray);
+	return @{ $self->{dtexts} } if ($self->{dtexts});
 }
 
+
 =head2 cat_texts
 
 Return whole text as single scalar.
@@ -243,9 +252,10 @@
 
 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.
@@ -272,12 +282,13 @@
 
 	$draft .= "\n";
 
-	$draft .= join("\n", @{ $self->{dtexts} }) . "\n";
-	$draft .= "\t" . join("\n\t", @{ $self->{htexts} }) . "\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
@@ -330,6 +341,7 @@
 	$self ? return $self : return undef;
 }
 
+
 =head2 set_phrase
 
   $cond->set_phrase('search phrase');
@@ -341,6 +353,7 @@
 	$self->{phrase} = $self->_s( shift );
 }
 
+
 =head2 add_attr
 
   $cond->add_attr('@URI STRINC /~dpavlin/');
@@ -353,6 +366,7 @@
 	push @{ $self->{attrs} }, $self->_s( $attr );
 }
 
+
 =head2 set_order
 
   $cond->set_order('@mdate NUMD');
@@ -364,6 +378,7 @@
 	$self->{order} = shift;
 }
 
+
 =head2 set_max
 
   $cond->set_max(42);
@@ -373,10 +388,11 @@
 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 );
@@ -405,6 +421,7 @@
 	$self->{options} ||= $options->{$option};
 }
 
+
 =head2 phrase
 
 Return search phrase.
@@ -418,6 +435,7 @@
 	return $self->{phrase};
 }
 
+
 =head2 order
 
 Return search result order.
@@ -431,6 +449,7 @@
 	return $self->{order};
 }
 
+
 =head2 attrs
 
 Return search result attrs.
@@ -442,9 +461,10 @@
 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.
@@ -460,6 +480,7 @@
 	return $self->{max};
 }
 
+
 =head2 options
 
 Return options for this condition.
@@ -478,10 +499,10 @@
 
 package Search::Estraier::ResultDocument;
 
-use Carp qw/confess croak/;
+use Carp qw/croak/;
 
-use Search::Estraier;
-our @ISA = qw/Search::Estraier/;
+#use Search::Estraier;
+#our @ISA = qw/Search::Estraier/;
 
 =head1 Search::Estraier::ResultDocument
 
@@ -504,13 +525,12 @@
 	my $self = {@_};
 	bless($self, $class);
 
-	foreach my $f (qw/uri attrs snippet keywords/) {
-		croak "missing $f for ResultDocument" unless defined($self->{$f});
-	}
+	croak "missing uri for ResultDocument" unless defined($self->{uri});
 
 	$self ? return $self : return undef;
 }
 
+
 =head2 uri
 
 Return URI of result document
@@ -539,6 +559,7 @@
 	return sort keys %{ $self->{attrs} };
 }
 
+
 =head2 attr
 
 Returns value of an attribute.
@@ -553,6 +574,7 @@
 	return $self->{attrs}->{ $name };
 }
 
+
 =head2 snippet
 
 Return snippet from result document
@@ -566,6 +588,7 @@
 	return $self->{snippet};
 }
 
+
 =head2 keywords
 
 Return keywords from result document
@@ -580,59 +603,920 @@
 }
 
 
-package Search::Estraier::Master;
+package Search::Estraier::NodeResult;
 
-use Carp;
+use Carp qw/croak/;
 
-=head1 Search::Estraier::Master
+#use Search::Estraier;
+#our @ISA = qw/Search::Estraier/;
 
-Controll node master. This requires user with administration priviledges.
+=head1 Search::Estraier::NodeResult
+
+=head2 new
+
+  my $res = new Search::HyperEstraier::NodeResult(
+  	docs => @array_of_rdocs,
+	hits => %hash_with_hints,
+  );
 
 =cut
 
-{
-	package RequestAgent;
-	our @ISA = qw(LWP::UserAgent);
+sub new {
+	my $class = shift;
+	my $self = {@_};
+	bless($self, $class);
 
-	sub new { 
-		my $self = LWP::UserAgent::new(@_);
-		$self->agent("Search-Estraier/$Search::Estraer::VERSION");
-		$self;
+	foreach my $f (qw/docs hints/) {
+		croak "missing $f for ResultDocument" unless defined($self->{$f});
 	}
 
-	sub get_basic_credentials {
-		my($self, $realm, $uri) = @_;
-#		return ($user, $password);
-	}
+	$self ? return $self : return undef;
 }
 
 
+=head2 doc_num
 
-=head2 new
+Return number of documents
 
-Create new connection to node master.
+  print $res->doc_num;
 
-  my $master = new Search::Estraier::Master(
-	url => 'http://localhost:1978',
-	user => 'admin',
-	passwd => 'admin',
-  );
+=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 $rec->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};
+}
+
+
+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;
 
 =cut
 
 sub new {
 	my $class = shift;
-	my $self = {@_};
+	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);
 
-	foreach my $p (qw/url user passwd/) {
-		croak "need $p" unless ($self->{$p});
-	}
+	my $args = {@_};
+
+	$self->{debug} = $args->{debug};
+	warn "## Node debug on\n" if ($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<IO::Socket::INET> 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} );
+	$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});
+
+	return -1 if (! $res->is_success);
+
+	($self->{status}, $self->{status_message}) = split(/\s+/, $res->status_line, 2);
+
+	$$resbody .= $res->content;
+
+	warn "## response body:\n$$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',
+		'text/plain',
+		$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);
+
+}
 
 ###