/[Search-Estraier]/trunk/Estraier.pm
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Revision 38 - (show annotations)
Thu Jan 5 22:27:03 2006 UTC (18 years, 1 month ago) by dpavlin
File size: 14669 byte(s)
more fun with http
1 package Search::Estraier;
2
3 use 5.008;
4 use strict;
5 use warnings;
6
7 our $VERSION = '0.00';
8
9 =head1 NAME
10
11 Search::Estraier - pure perl module to use Hyper Estraier search engine
12
13 =head1 SYNOPSIS
14
15 use Search::Estraier;
16 my $est = new Search::Estraier();
17
18 =head1 DESCRIPTION
19
20 This module is implementation of node API of Hyper Estraier. Since it's
21 perl-only module with dependencies only on standard perl modules, it will
22 run on all platforms on which perl runs. It doesn't require compilation
23 or Hyper Estraier development files on target machine.
24
25 It is implemented as multiple packages which closly resamble Ruby
26 implementation. It also includes methods to manage nodes.
27
28 =cut
29
30 =head2 _s
31
32 Remove multiple whitespaces from string, as well as whitespaces at beginning or end
33
34 my $text = $self->_s(" this is a text ");
35 $text = 'this is a text';
36
37 =cut
38
39 sub _s {
40 my $text = $_[1] || return;
41 $text =~ s/\s\s+/ /gs;
42 $text =~ s/^\s+//;
43 $text =~ s/\s+$//;
44 return $text;
45 }
46
47 package Search::Estraier::Document;
48
49 use Carp qw/croak confess/;
50
51 use Search::Estraier;
52 our @ISA = qw/Search::Estraier/;
53
54 =head1 Search::Estraier::Document
55
56 This class implements Document which is collection of attributes
57 (key=value), vectors (also key value) display text and hidden text.
58
59 =head2 new
60
61 Create new document, empty or from draft.
62
63 my $doc = new Search::HyperEstraier::Document;
64 my $doc2 = new Search::HyperEstraier::Document( $draft );
65
66 =cut
67
68 sub new {
69 my $class = shift;
70 my $self = {};
71 bless($self, $class);
72
73 $self->{id} = -1;
74
75 my $draft = shift;
76
77 if ($draft) {
78 my $in_text = 0;
79 foreach my $line (split(/\n/, $draft)) {
80
81 if ($in_text) {
82 if ($line =~ /^\t/) {
83 push @{ $self->{htexts} }, substr($line, 1);
84 } else {
85 push @{ $self->{dtexts} }, $line;
86 }
87 next;
88 }
89
90 if ($line =~ m/^%VECTOR\t(.+)$/) {
91 my @fields = split(/\t/, $1);
92 for my $i ( 0 .. ($#fields - 1) ) {
93 $self->{kwords}->{ $fields[ $i ] } = $fields[ $i + 1 ];
94 $i++;
95 }
96 next;
97 } elsif ($line =~ m/^%/) {
98 # What is this? comment?
99 #warn "$line\n";
100 next;
101 } elsif ($line =~ m/^$/) {
102 $in_text = 1;
103 next;
104 } elsif ($line =~ m/^(.+)=(.+)$/) {
105 $self->{attrs}->{ $1 } = $2;
106 next;
107 }
108
109 warn "draft ignored: $line\n";
110 }
111 }
112
113 $self ? return $self : return undef;
114 }
115
116
117 =head2 add_attr
118
119 Add an attribute.
120
121 $doc->add_attr( name => 'value' );
122
123 Delete attribute using
124
125 $doc->add_attr( name => undef );
126
127 =cut
128
129 sub add_attr {
130 my $self = shift;
131 my $attrs = {@_};
132
133 while (my ($name, $value) = each %{ $attrs }) {
134 if (! defined($value)) {
135 delete( $self->{attrs}->{ $self->_s($name) } );
136 } else {
137 $self->{attrs}->{ $self->_s($name) } = $self->_s($value);
138 }
139 }
140
141 return 1;
142 }
143
144
145 =head2 add_text
146
147 Add a sentence of text.
148
149 $doc->add_text('this is example text to display');
150
151 =cut
152
153 sub add_text {
154 my $self = shift;
155 my $text = shift;
156 return unless defined($text);
157
158 push @{ $self->{dtexts} }, $self->_s($text);
159 }
160
161
162 =head2 add_hidden_text
163
164 Add a hidden sentence.
165
166 $doc->add_hidden_text('this is example text just for search');
167
168 =cut
169
170 sub add_hidden_text {
171 my $self = shift;
172 my $text = shift;
173 return unless defined($text);
174
175 push @{ $self->{htexts} }, $self->_s($text);
176 }
177
178 =head2 id
179
180 Get the ID number of document. If the object has never been registred, C<-1> is returned.
181
182 print $doc->id;
183
184 =cut
185
186 sub id {
187 my $self = shift;
188 return $self->{id};
189 }
190
191 =head2 attr_names
192
193 Returns array with attribute names from document object.
194
195 my @attrs = $doc->attr_names;
196
197 =cut
198
199 sub attr_names {
200 my $self = shift;
201 croak "attr_names return array, not scalar" if (! wantarray);
202 return sort keys %{ $self->{attrs} };
203 }
204
205
206 =head2 attr
207
208 Returns value of an attribute.
209
210 my $value = $doc->attr( 'attribute' );
211
212 =cut
213
214 sub attr {
215 my $self = shift;
216 my $name = shift;
217
218 return $self->{'attrs'}->{ $name };
219 }
220
221
222 =head2 texts
223
224 Returns array with text sentences.
225
226 my @texts = $doc->texts;
227
228 =cut
229
230 sub texts {
231 my $self = shift;
232 confess "texts return array, not scalar" if (! wantarray);
233 return @{ $self->{dtexts} };
234 }
235
236 =head2 cat_texts
237
238 Return whole text as single scalar.
239
240 my $text = $doc->cat_texts;
241
242 =cut
243
244 sub cat_texts {
245 my $self = shift;
246 return join(' ',@{ $self->{dtexts} });
247 }
248
249 =head2 dump_draft
250
251 Dump draft data from document object.
252
253 print $doc->dump_draft;
254
255 =cut
256
257 sub dump_draft {
258 my $self = shift;
259 my $draft;
260
261 foreach my $attr_name (sort keys %{ $self->{attrs} }) {
262 $draft .= $attr_name . '=' . $self->{attrs}->{$attr_name} . "\n";
263 }
264
265 if ($self->{kwords}) {
266 $draft .= '%%VECTOR';
267 while (my ($key, $value) = each %{ $self->{kwords} }) {
268 $draft .= "\t$key\t$value";
269 }
270 $draft .= "\n";
271 }
272
273 $draft .= "\n";
274
275 $draft .= join("\n", @{ $self->{dtexts} }) . "\n";
276 $draft .= "\t" . join("\n\t", @{ $self->{htexts} }) . "\n";
277
278 return $draft;
279 }
280
281 =head2 delete
282
283 Empty document object
284
285 $doc->delete;
286
287 This function is addition to original Ruby API, and since it was included in C wrappers it's here as a
288 convinience. Document objects which go out of scope will be destroyed
289 automatically.
290
291 =cut
292
293 sub delete {
294 my $self = shift;
295
296 foreach my $data (qw/attrs dtexts stexts kwords/) {
297 delete($self->{$data});
298 }
299
300 $self->{id} = -1;
301
302 return 1;
303 }
304
305
306
307 package Search::Estraier::Condition;
308
309 use Carp qw/confess croak/;
310
311 use Search::Estraier;
312 our @ISA = qw/Search::Estraier/;
313
314 =head1 Search::Estraier::Condition
315
316 =head2 new
317
318 my $cond = new Search::HyperEstraier::Condition;
319
320 =cut
321
322 sub new {
323 my $class = shift;
324 my $self = {};
325 bless($self, $class);
326
327 $self->{max} = -1;
328 $self->{options} = 0;
329
330 $self ? return $self : return undef;
331 }
332
333 =head2 set_phrase
334
335 $cond->set_phrase('search phrase');
336
337 =cut
338
339 sub set_phrase {
340 my $self = shift;
341 $self->{phrase} = $self->_s( shift );
342 }
343
344 =head2 add_attr
345
346 $cond->add_attr('@URI STRINC /~dpavlin/');
347
348 =cut
349
350 sub add_attr {
351 my $self = shift;
352 my $attr = shift || return;
353 push @{ $self->{attrs} }, $self->_s( $attr );
354 }
355
356 =head2 set_order
357
358 $cond->set_order('@mdate NUMD');
359
360 =cut
361
362 sub set_order {
363 my $self = shift;
364 $self->{order} = shift;
365 }
366
367 =head2 set_max
368
369 $cond->set_max(42);
370
371 =cut
372
373 sub set_max {
374 my $self = shift;
375 my $max = shift;
376 croak "set_max needs number" unless ($max =~ m/^\d+$/);
377 $self->{max} = $max;
378 }
379
380 =head2 set_options
381
382 $cond->set_options( SURE => 1 );
383
384 =cut
385
386 my $options = {
387 # check N-gram keys skipping by three
388 SURE => 1 << 0,
389 # check N-gram keys skipping by two
390 USUAL => 1 << 1,
391 # without TF-IDF tuning
392 FAST => 1 << 2,
393 # with the simplified phrase
394 AGITO => 1 << 3,
395 # check every N-gram key
396 NOIDF => 1 << 4,
397 # check N-gram keys skipping by one
398 SIMPLE => 1 << 10,
399 };
400
401 sub set_options {
402 my $self = shift;
403 my $option = shift;
404 confess "unknown option" unless ($options->{$option});
405 $self->{options} ||= $options->{$option};
406 }
407
408 =head2 phrase
409
410 Return search phrase.
411
412 print $cond->phrase;
413
414 =cut
415
416 sub phrase {
417 my $self = shift;
418 return $self->{phrase};
419 }
420
421 =head2 order
422
423 Return search result order.
424
425 print $cond->order;
426
427 =cut
428
429 sub order {
430 my $self = shift;
431 return $self->{order};
432 }
433
434 =head2 attrs
435
436 Return search result attrs.
437
438 my @cond_attrs = $cond->attrs;
439
440 =cut
441
442 sub attrs {
443 my $self = shift;
444 #croak "attrs return array, not scalar" if (! wantarray);
445 return @{ $self->{attrs} };
446 }
447
448 =head2 max
449
450 Return maximum number of results.
451
452 print $cond->max;
453
454 C<-1> is returned for unitialized value, C<0> is unlimited.
455
456 =cut
457
458 sub max {
459 my $self = shift;
460 return $self->{max};
461 }
462
463 =head2 options
464
465 Return options for this condition.
466
467 print $cond->options;
468
469 Options are returned in numerical form.
470
471 =cut
472
473 sub options {
474 my $self = shift;
475 return $self->{options};
476 }
477
478
479 package Search::Estraier::ResultDocument;
480
481 use Carp qw/croak/;
482
483 #use Search::Estraier;
484 #our @ISA = qw/Search::Estraier/;
485
486 =head1 Search::Estraier::ResultDocument
487
488 =head2 new
489
490 my $rdoc = new Search::HyperEstraier::ResultDocument(
491 uri => 'http://localhost/document/uri/42',
492 attrs => {
493 foo => 1,
494 bar => 2,
495 },
496 snippet => 'this is a text of snippet'
497 keywords => 'this\tare\tkeywords'
498 );
499
500 =cut
501
502 sub new {
503 my $class = shift;
504 my $self = {@_};
505 bless($self, $class);
506
507 foreach my $f (qw/uri attrs snippet keywords/) {
508 croak "missing $f for ResultDocument" unless defined($self->{$f});
509 }
510
511 $self ? return $self : return undef;
512 }
513
514 =head2 uri
515
516 Return URI of result document
517
518 print $rdoc->uri;
519
520 =cut
521
522 sub uri {
523 my $self = shift;
524 return $self->{uri};
525 }
526
527
528 =head2 attr_names
529
530 Returns array with attribute names from result document object.
531
532 my @attrs = $rdoc->attr_names;
533
534 =cut
535
536 sub attr_names {
537 my $self = shift;
538 croak "attr_names return array, not scalar" if (! wantarray);
539 return sort keys %{ $self->{attrs} };
540 }
541
542 =head2 attr
543
544 Returns value of an attribute.
545
546 my $value = $rdoc->attr( 'attribute' );
547
548 =cut
549
550 sub attr {
551 my $self = shift;
552 my $name = shift || return;
553 return $self->{attrs}->{ $name };
554 }
555
556 =head2 snippet
557
558 Return snippet from result document
559
560 print $rdoc->snippet;
561
562 =cut
563
564 sub snippet {
565 my $self = shift;
566 return $self->{snippet};
567 }
568
569 =head2 keywords
570
571 Return keywords from result document
572
573 print $rdoc->keywords;
574
575 =cut
576
577 sub keywords {
578 my $self = shift;
579 return $self->{keywords};
580 }
581
582
583 package Search::Estraier::NodeResult;
584
585 use Carp qw/croak/;
586
587 #use Search::Estraier;
588 #our @ISA = qw/Search::Estraier/;
589
590 =head1 Search::Estraier::NodeResult
591
592 =head2 new
593
594 my $res = new Search::HyperEstraier::NodeResult(
595 docs => @array_of_rdocs,
596 hits => %hash_with_hints,
597 );
598
599 =cut
600
601 sub new {
602 my $class = shift;
603 my $self = {@_};
604 bless($self, $class);
605
606 foreach my $f (qw/docs hints/) {
607 croak "missing $f for ResultDocument" unless defined($self->{$f});
608 }
609
610 $self ? return $self : return undef;
611 }
612
613 =head2 doc_num
614
615 Return number of documents
616
617 print $res->doc_num;
618
619 =cut
620
621 sub doc_num {
622 my $self = shift;
623 return $#{$self->{docs}};
624 }
625
626 =head2 get_doc
627
628 Return single document
629
630 my $doc = $res->get_doc( 42 );
631
632 Returns undef if document doesn't exist.
633
634 =cut
635
636 sub get_doc {
637 my $self = shift;
638 my $num = shift;
639 croak "expect number as argument" unless ($num =~ m/^\d+$/);
640 return undef if ($num < 0 || $num > $self->{docs});
641 return $self->{docs}->[$num];
642 }
643
644 =head2 hint
645
646 Return specific hint from results.
647
648 print $rec->hint( 'VERSION' );
649
650 Possible hints are: C<VERSION>, C<NODE>, C<HIT>, C<HINT#n>, C<DOCNUM>, C<WORDNUM>,
651 C<TIME>, C<LINK#n>, C<VIEW>.
652
653 =cut
654
655 sub hint {
656 my $self = shift;
657 my $key = shift || return;
658 return $self->{hints}->{$key};
659 }
660
661
662 package Search::Estraier::Node;
663
664 use Carp qw/carp croak/;
665 use URI;
666 use MIME::Base64;
667 use IO::Socket::INET;
668
669 =head1 Search::Estraier::Node
670
671 =head2 new
672
673 my $node = new Search::HyperEstraier::Node;
674
675 =cut
676
677 sub new {
678 my $class = shift;
679 my $self = {
680 pxport => -1,
681 timeout => 0, # this used to be -1
682 dnum => -1,
683 wnum => -1,
684 size => -1.0,
685 wwidth => 480,
686 hwidth => 96,
687 awidth => 96,
688 status => -1,
689 };
690 bless($self, $class);
691
692 $self ? return $self : return undef;
693 }
694
695 =head2 set_url
696
697 Specify URL to node server
698
699 $node->set_url('http://localhost:1978');
700
701 =cut
702
703 sub set_url {
704 my $self = shift;
705 $self->{url} = shift;
706 }
707
708 =head2 set_proxy
709
710 Specify proxy server to connect to node server
711
712 $node->set_proxy('proxy.example.com', 8080);
713
714 =cut
715
716 sub set_proxy {
717 my $self = shift;
718 my ($host,$port) = @_;
719 croak "proxy port must be number" unless ($port =~ m/^\d+$/);
720 $self->{pxhost} = $host;
721 $self->{pxport} = $port;
722 }
723
724 =head2 set_timeout
725
726 Specify timeout of connection in seconds
727
728 $node->set_timeout( 15 );
729
730 =cut
731
732 sub set_timeout {
733 my $self = shift;
734 my $sec = shift;
735 croak "timeout must be number" unless ($sec =~ m/^\d+$/);
736 $self->{timeout} = $sec;
737 }
738
739 =head2 set_auth
740
741 Specify name and password for authentication to node server.
742
743 $node->set_auth('clint','eastwood');
744
745 =cut
746
747 sub set_auth {
748 my $self = shift;
749 my ($login,$passwd) = @_;
750 $self->{auth} = encode_base64( "$login:$passwd" );
751 }
752
753 =head2 status
754
755 Return status code of last request.
756
757 print $res->status;
758
759 C<-1> means connection failure.
760
761 =cut
762
763 sub status {
764 my $self = shift;
765 return $self->{status};
766 }
767
768 =head2 shuttle_url
769
770 This is method which uses C<IO::Socket::INET> to communicate with Hyper Estraier node
771 master.
772
773 my $rv = shuttle_url( $url, $content_type, \$req_body, \$resbody );
774
775 C<$resheads> and C<$resbody> booleans controll if response headers and/or response
776 body will be saved within object.
777
778 =cut
779
780 sub shuttle_url {
781 my $self = shift;
782
783 my ($url, $content_type, $reqbody, $resbody) = @_;
784
785 my $status = -1;
786
787 warn "## $url\n";
788
789 $url = new URI($url);
790 if (
791 !$url || !$url->scheme || !$url->scheme eq 'http' ||
792 !$url->host || !$url->port || $url->port < 1
793 ) {
794 carp "can't parse $url\n";
795 return -1;
796 }
797
798 my ($host,$port,$query) = ($url->host, $url->port, $url->path);
799
800 if ($self->{pxhost}) {
801 ($host,$port) = ($self->{pxhost}, $self->{pxport});
802 $query = "http://$host:$port/$query";
803 }
804
805 $query .= '?' . $url->query if ($url->query && ! $reqbody);
806
807 my $headers;
808
809 if ($reqbody) {
810 $headers .= "POST $query HTTP/1.0\r\n";
811 } else {
812 $headers .= "GET $query HTTP/1.0\r\n";
813 }
814
815 $headers .= "Host: $url->host:$url->port\r\n";
816 $headers .= "Connection: close\r\n";
817 $headers .= "User-Agent: Search-Estraier/$Search::Estraier::VERSION\r\n";
818 $headers .= "Content-Type $content_type\r\n";
819 $headers .= "Authorization: Basic $self->{auth}\r\n";
820 my $len = 0;
821 {
822 use bytes;
823 $len = length($reqbody) if ($reqbody);
824 }
825 $headers .= "Content-Length: $len\r\n";
826 $headers .= "\r\n";
827
828 my $sock = IO::Socket::INET->new(
829 PeerAddr => $host,
830 PeerPort => $port,
831 Proto => 'tcp',
832 Timeout => $self->{timeout} || 90,
833 );
834
835 if (! $sock) {
836 carp "can't open socket to $host:$port";
837 return -1;
838 }
839
840 print $sock $headers or
841 carp "can't send headers to network:\n$headers\n" and return -1;
842
843 if ($reqbody) {
844 print $sock $$reqbody or
845 carp "can't send request body to network:\n$$reqbody\n" and return -1;
846 }
847
848 my $line = <$sock>;
849 chomp($line);
850 my ($schema, $res_status, undef) = split(/ */, $line, 3);
851 return if ($schema !~ /^HTTP/ || ! $res_status);
852
853 $self->{status} = $res_status;
854
855 # skip rest of headers
856 $line = <$sock>;
857 while ($line) {
858 $line = <$sock>;
859 $line =~ s/[\r\n]+$//;
860 warn "## ", $line || 'NULL', " ##\n";
861 };
862
863 # read body
864 $len = 0;
865 do {
866 $len = read($sock, my $buf, 8192);
867 $$resbody .= $buf if ($resbody);
868 } while ($len);
869
870 return $status;
871 }
872
873 ###
874
875 =head1 EXPORT
876
877 Nothing.
878
879 =head1 SEE ALSO
880
881 L<http://hyperestraier.sourceforge.net/>
882
883 Hyper Estraier Ruby interface on which this module is based.
884
885 =head1 AUTHOR
886
887 Dobrica Pavlinusic, E<lt>dpavlin@rot13.orgE<gt>
888
889
890 =head1 COPYRIGHT AND LICENSE
891
892 Copyright (C) 2005-2006 by Dobrica Pavlinusic
893
894 This library is free software; you can redistribute it and/or modify
895 it under the GPL v2 or later.
896
897 =cut
898
899 1;

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