1 |
package SWISH::Split; |
2 |
|
3 |
use 5.008; |
4 |
use strict; |
5 |
use warnings; |
6 |
|
7 |
our $VERSION = '0.03'; |
8 |
|
9 |
use SWISH::API; |
10 |
use Text::Iconv; |
11 |
use File::Temp qw/ :mktemp /; |
12 |
use Carp; |
13 |
use Digest::MD5 qw(md5_hex); |
14 |
use Memoize; |
15 |
use File::Which; |
16 |
|
17 |
use Data::Dumper; |
18 |
|
19 |
use constant { |
20 |
ADDED => 1, |
21 |
DELETED => 2, |
22 |
}; |
23 |
|
24 |
=head1 NAME |
25 |
|
26 |
SWISH::Split - Perl interface to split index variant of Swish-e |
27 |
|
28 |
=head1 SYNOPSIS |
29 |
|
30 |
use SWISH::Split; |
31 |
|
32 |
|
33 |
=head1 DESCRIPTION |
34 |
|
35 |
This is alternative interface for indexing data with swish-e. It's designed |
36 |
to split indexes over multiple files (slices) to allow updates of records in index |
37 |
by reindexing just changed parts (slice). |
38 |
|
39 |
Data is stored in index using intrface which is somewhat similar to |
40 |
L<Plucene::Simple>. This could make your migration (or supporting two index |
41 |
engines) easier. |
42 |
|
43 |
In the background, it will fork swish-e binaries (one for each index slice) |
44 |
and produce UTF-8 encoded XML files for it. So, if your input charset isn't |
45 |
C<ISO-8859-1> you will have to specify it. |
46 |
|
47 |
=head1 Methods used for indexing |
48 |
|
49 |
=head2 open_index |
50 |
|
51 |
Create new object for index. |
52 |
|
53 |
my $i = SWISH::Split->open_index({ |
54 |
index => '/path/to/index', |
55 |
slice_name => \&slice_on_path, |
56 |
slices => 30, |
57 |
merge => 0, |
58 |
codepage => 'ISO-8859-2', |
59 |
swish_config => qq{ |
60 |
PropertyNames from date |
61 |
PropertyNamesDate date |
62 |
}, |
63 |
memoize_to_xml => 0, |
64 |
); |
65 |
|
66 |
# split index on first component of path |
67 |
sub slice_on_path { |
68 |
return shift split(/\//,$_[0]); |
69 |
} |
70 |
|
71 |
Options to C<open_index> are following: |
72 |
|
73 |
=over 5 |
74 |
|
75 |
=item C<index> |
76 |
|
77 |
path to (existing) directory in which index slices will be created. |
78 |
|
79 |
=item C<slice_name> |
80 |
|
81 |
coderef to function which provide slicing from path. |
82 |
|
83 |
=item C<slices> |
84 |
|
85 |
maximum number of index slices. See L<"in_slice"> for |
86 |
more explanation. |
87 |
|
88 |
=item C<merge> |
89 |
|
90 |
(planned) option to merge indexes into one at end. |
91 |
|
92 |
=item C<codepage> |
93 |
|
94 |
data codepage (needed for conversion to UTF-8). |
95 |
By default, it's C<ISO-8859-1>. |
96 |
|
97 |
=item C<swish_config> |
98 |
|
99 |
additional parametars which will be inserted into |
100 |
C<swish-e> configuration file. See L<swish-config>. |
101 |
|
102 |
=item C<memoize_to_xml> |
103 |
|
104 |
speed up repeatable data, see L<"to_xml">. |
105 |
|
106 |
=back |
107 |
|
108 |
=cut |
109 |
|
110 |
my $iso2utf = Text::Iconv->new('ISO-8859-1','UTF-8'); |
111 |
|
112 |
sub open_index { |
113 |
my $class = shift; |
114 |
my $self = {@_}; |
115 |
bless($self, $class); |
116 |
|
117 |
croak "need slice_name coderef" unless ref $self->{'slice_name'}; |
118 |
croak "need slices" unless $self->{'slices'}; |
119 |
|
120 |
croak "need index" unless $self->{'index'}; |
121 |
croak "index '",$self->{'index'},"' doesn't exist" unless -e $self->{'index'}; |
122 |
croak "index '",$self->{'index'},"' is not directory" unless -d $self->{'index'}; |
123 |
|
124 |
$iso2utf = Text::Iconv->new($self->{'codepage'},'UTF-8') if ($self->{'codepage'}); |
125 |
|
126 |
# speedup |
127 |
memoize('in_slice'); |
128 |
memoize('to_xml') if ($self->{'memoize_to_xml'}); |
129 |
|
130 |
$self ? return $self : return undef; |
131 |
|
132 |
} |
133 |
|
134 |
=head2 add |
135 |
|
136 |
Add document to index. |
137 |
|
138 |
$i->add($swishpath, { |
139 |
headline => 'foobar result', |
140 |
property => 'data', |
141 |
}) |
142 |
|
143 |
=cut |
144 |
|
145 |
sub add { |
146 |
my $self = shift; |
147 |
|
148 |
my $swishpath = shift || return; |
149 |
my $data = shift || return; |
150 |
|
151 |
my $slice = $self->put_slice($swishpath, $self->to_xml($data)); |
152 |
|
153 |
return $slice; |
154 |
} |
155 |
|
156 |
=head2 delete |
157 |
|
158 |
Delete documents from index. |
159 |
|
160 |
$i->delete(@swishpath); |
161 |
|
162 |
=cut |
163 |
|
164 |
sub delete { |
165 |
my $self = shift; |
166 |
|
167 |
my @paths = @_ || return; |
168 |
|
169 |
foreach my $path (@paths) { |
170 |
$self->{'paths'}->{$path} = DELETED; |
171 |
} |
172 |
|
173 |
return 42; |
174 |
} |
175 |
|
176 |
|
177 |
=head2 done |
178 |
|
179 |
Finish indexing and close index file(s). |
180 |
|
181 |
$i->done; |
182 |
|
183 |
This is most time-consuming operation. When it's called, it will re-index |
184 |
all entries which haven't changed in all slices. |
185 |
|
186 |
Returns number of slices updated. |
187 |
|
188 |
This method should really be called close or finish, but both of those are |
189 |
allready used. |
190 |
|
191 |
=cut |
192 |
|
193 |
sub done { |
194 |
my $self = shift; |
195 |
|
196 |
my $ret = 0; |
197 |
|
198 |
foreach my $s (keys %{$self->{'slice'}}) { |
199 |
$self->_debug("closing slice $s"); |
200 |
$ret += $self->close_slice($s); |
201 |
} |
202 |
|
203 |
return $ret; |
204 |
} |
205 |
|
206 |
|
207 |
|
208 |
=head1 Reporting methods |
209 |
|
210 |
This methods return statistics about your index. |
211 |
|
212 |
=head2 swishpaths |
213 |
|
214 |
Return array of C<swishpath>s in index. |
215 |
|
216 |
my @p = $i->swishpaths; |
217 |
|
218 |
=cut |
219 |
|
220 |
sub swishpaths { |
221 |
my $self = shift; |
222 |
|
223 |
my $s = shift || return; |
224 |
return if (! exists($self->{'slice'}->{'s'})); |
225 |
|
226 |
return keys %{$self->{'slice'}->{'s'}}; |
227 |
} |
228 |
|
229 |
=head2 swishpaths_updated |
230 |
|
231 |
Return array with updated C<swishpath>s. |
232 |
|
233 |
my @d = $i->swishpaths_updated; |
234 |
|
235 |
=cut |
236 |
|
237 |
sub swishpaths_updated { |
238 |
my $self = shift; |
239 |
} |
240 |
|
241 |
|
242 |
=head2 swishpaths_deleted |
243 |
|
244 |
Return array with deleted C<swishpath>s. |
245 |
|
246 |
my $n = $i->swishpaths_deleted; |
247 |
|
248 |
=cut |
249 |
|
250 |
sub swishpaths_deleted { |
251 |
my $self = shift; |
252 |
} |
253 |
|
254 |
|
255 |
=head2 slices |
256 |
|
257 |
Return array with all slice names. |
258 |
|
259 |
my @s = $i->slices; |
260 |
|
261 |
=cut |
262 |
|
263 |
sub slices { |
264 |
my $self = shift; |
265 |
} |
266 |
|
267 |
=head1 Helper methods |
268 |
|
269 |
This methods are used internally, but they might be useful. |
270 |
|
271 |
=head2 in_slice |
272 |
|
273 |
Takes path and return slice in which this path belongs. |
274 |
|
275 |
my $s = $i->in_slice('path/to/document/in/index'); |
276 |
|
277 |
If there are C<slices> parametar to L<"open_index"> it will use |
278 |
MD5 hash to spread documents across slices. That will produce random |
279 |
distribution of your documents in slices, which might or might not be best |
280 |
for your data. If you have to re-index large number of slices on each |
281 |
run, think about creating your own C<slice> function and distributing |
282 |
documents manually across slices. |
283 |
|
284 |
Slice number must always be true value or various sanity checks will fail. |
285 |
|
286 |
This function is C<Memoize>ed for performance reasons. |
287 |
|
288 |
=cut |
289 |
|
290 |
sub in_slice { |
291 |
my $self = shift; |
292 |
|
293 |
my $path = shift || confess "need path"; |
294 |
|
295 |
confess "need slice_name function" unless ref ($self->{'slice_name'}); |
296 |
|
297 |
if ($self->{'slices'}) { |
298 |
# first, pass path through slice_name function |
299 |
my $slice = &{$self->{'slice_name'}}($path); |
300 |
# then calculate MD5 hash |
301 |
my $hash = md5_hex($slice); |
302 |
# take first 8 chars to produce number |
303 |
# FIXME how random is this? |
304 |
$hash = hex(substr($hash,0,8)); |
305 |
|
306 |
$slice = ($hash % $self->{'slices'}) + 1; |
307 |
$self->_debug("hash: $hash / ",$self->{'slices'}," => $slice"); |
308 |
return $slice; |
309 |
} else { |
310 |
return &{$self->{'split'}}($path); |
311 |
} |
312 |
} |
313 |
|
314 |
=head2 find_paths |
315 |
|
316 |
Return array of C<swishpath>s for given C<swish-e> query. |
317 |
|
318 |
my @p = $i->find_paths("headline=test*"); |
319 |
|
320 |
Useful for combining with L<"delete_documents"> to delete documents |
321 |
which hasn't changed a while (so, expired). |
322 |
|
323 |
=cut |
324 |
|
325 |
sub find_paths { |
326 |
my $self = shift; |
327 |
|
328 |
} |
329 |
|
330 |
|
331 |
=head2 make_config |
332 |
|
333 |
Create C<swish-e> configuration file for given slice. |
334 |
|
335 |
my $config_filename = $i->make_config('slice name'); |
336 |
|
337 |
It returns configuration filename. If no C<swish_config> was defined in |
338 |
L<"open_index">, default swish-e configuration will be used. It will index all data for |
339 |
searching, but none for properties. |
340 |
|
341 |
If you want to see what is allready defined for swish-e in configuration |
342 |
take a look at source code for C<DEFAULT_SWISH_CONF>. |
343 |
|
344 |
It uses C<stdin> as C<IndexDir> to comunicate with C<swish-e>. |
345 |
|
346 |
=cut |
347 |
|
348 |
sub make_config { |
349 |
my $self = shift; |
350 |
|
351 |
|
352 |
my $index_file = $self->{'index'}."/"; |
353 |
$index_file .= shift || confess "need slice name"; |
354 |
|
355 |
my ($tmp_fh, $swish_config_filename) = mkstemp("/tmp/swishXXXXX"); |
356 |
|
357 |
# find cat on filesystem |
358 |
my $cat = which('cat'); |
359 |
|
360 |
print $tmp_fh <<"DEFAULT_SWISH_CONF"; |
361 |
# swish-e config file |
362 |
|
363 |
IndexDir stdin |
364 |
|
365 |
# input file definition |
366 |
DefaultContents XML* |
367 |
|
368 |
# indexed metatags |
369 |
MetaNames xml swishdocpath |
370 |
|
371 |
|
372 |
#XMLClassAttributes type |
373 |
UndefinedMetaTags auto |
374 |
UndefinedXMLAttributes auto |
375 |
|
376 |
IndexFile $index_file |
377 |
|
378 |
# Croatian ISO-8859-2 characters to unaccented equivalents |
379 |
TranslateCharacters ¹©ðÐèÈæƾ® ssddcccczz |
380 |
|
381 |
|
382 |
# disable output |
383 |
ParserWarnLevel 0 |
384 |
IndexReport 1 |
385 |
|
386 |
DEFAULT_SWISH_CONF |
387 |
|
388 |
# add user parametars (like stored properties) |
389 |
print $tmp_fh $self->{'swish_config'} if ($self->{'swish_config'}); |
390 |
|
391 |
close($tmp_fh); |
392 |
|
393 |
return $swish_config_filename; |
394 |
} |
395 |
|
396 |
=head2 create_slice |
397 |
|
398 |
On first run, starts C<swish-e>. On subsequent calls just return |
399 |
it's handles using L<Memoize>. |
400 |
|
401 |
my $s = create_slice('/path/to/document'); |
402 |
|
403 |
You shouldn't need to call C<create_slice> directly because it will be called |
404 |
from L<"put_slice"> when needed. |
405 |
|
406 |
=cut |
407 |
|
408 |
sub create_slice { |
409 |
my $self = shift; |
410 |
|
411 |
my $path = shift || confess "create_slice need path!"; |
412 |
|
413 |
my $s = $self->in_slice($path) || confess "in_slice returned null"; |
414 |
|
415 |
return $s if (exists($self->{'slice'}->{$s})); |
416 |
|
417 |
my $swish_config = $self->make_config($s); |
418 |
|
419 |
my $swish = qq{| swish-e }; |
420 |
if (-f $self->{'index'}.'/'.$s) { |
421 |
$swish .= qq{ -u }; |
422 |
$self->{'slice'}->{$s}->{'update_mode'}++; |
423 |
} |
424 |
$swish .= qq{ -S prog -c } . $swish_config; |
425 |
|
426 |
$self->_debug("creating slice $s using $swish"); |
427 |
|
428 |
## Build the harness, open all pipes, and launch the subprocesses |
429 |
open(my $fh, $swish) || croak "can't open $swish: $!"; |
430 |
|
431 |
$self->{'slice'}->{$s}->{'h'} = $fh; |
432 |
|
433 |
$self->slice_output($s); |
434 |
|
435 |
return $s; |
436 |
} |
437 |
|
438 |
=head2 put_slice |
439 |
|
440 |
Pass XML data to swish. |
441 |
|
442 |
my $slice = $i->put_slice('/swish/path', '<xml>data</xml>'); |
443 |
|
444 |
Returns slice in which XML ended up. |
445 |
|
446 |
=cut |
447 |
|
448 |
sub put_slice { |
449 |
my $self = shift; |
450 |
|
451 |
my $path = shift || confess "need path"; |
452 |
my $xml = shift || confess "need xml"; |
453 |
|
454 |
$xml = $iso2utf->convert($xml) || carp "XML conversion error in $xml"; |
455 |
|
456 |
my $s = $self->create_slice($path) || confess "create_slice returned null"; |
457 |
|
458 |
confess "no slice $s" unless(exists($self->{'slice'}) && exists($self->{'slice'}->{$s})); |
459 |
confess "no 'h' in slice $s: ".Dumper($s) unless (exists($self->{'slice'}->{$s}->{'h'})); |
460 |
|
461 |
$self->slice_output($s); |
462 |
|
463 |
use bytes; # as opposed to chars |
464 |
my $fh = $self->{'slice'}->{$s}->{'h'} || confess "handle for slice $s undefined"; |
465 |
|
466 |
my $update_header = "Update-Mode: Index\n"; |
467 |
$update_header = '' unless ($self->{'slice'}->{$s}->{'update_mode'}); |
468 |
|
469 |
print { $fh } "Path-Name: $path\n". |
470 |
"Content-Length: ".(length($xml)+1)."\n" . $update_header . |
471 |
"Document-Type: XML\n\n$xml\n"; |
472 |
|
473 |
$self->slice_output($s); |
474 |
|
475 |
$self->_debug("dumping in slice $s: $path"); |
476 |
|
477 |
$self->{'paths'}->{$path} = ADDED; |
478 |
|
479 |
return $s; |
480 |
} |
481 |
|
482 |
=head2 slice_output |
483 |
|
484 |
Prints to STDERR output and errors from C<swish-e>. |
485 |
|
486 |
my $slice = $i->slice_output($s); |
487 |
|
488 |
Normally, you don't need to call it. |
489 |
|
490 |
B<This is dummy placeholder function for very old code that assumes this |
491 |
module is using C<IPC::Run> which it isn't any more.> |
492 |
|
493 |
=cut |
494 |
|
495 |
sub slice_output { |
496 |
my $self = shift; |
497 |
|
498 |
my $s = shift || confess "slice_output needs slice"; |
499 |
|
500 |
confess "no slice $s" unless(exists($self->{'slice'}) && exists($self->{'slice'}->{$s})); |
501 |
|
502 |
# FIXME |
503 |
|
504 |
return $s; |
505 |
} |
506 |
|
507 |
=head2 close_slice |
508 |
|
509 |
Close slice (terminates swish-e process for that slice). |
510 |
|
511 |
my $i->close_slice($s); |
512 |
|
513 |
Returns true if slice is closed, false otherwise. |
514 |
|
515 |
=cut |
516 |
|
517 |
sub close_slice { |
518 |
my $self = shift; |
519 |
|
520 |
my $s = shift || confess "close_slice needs slice"; |
521 |
|
522 |
confess "no slice $s" unless(exists($self->{'slice'}) && exists($self->{'slice'}->{$s})); |
523 |
confess "no 'h' in slice $s: ".Dumper($s) unless (exists($self->{'slice'}->{$s}->{'h'})); |
524 |
|
525 |
# pump rest of content (if any) |
526 |
close $self->{'slice'}->{$s}->{'h'} || carp "can't close slice $s: $!"; |
527 |
|
528 |
$self->slice_output($s); |
529 |
|
530 |
undef $self->{'slice'}->{$s}->{'h'}; |
531 |
|
532 |
delete($self->{'slice'}->{$s}) && return 1; |
533 |
return 0; |
534 |
} |
535 |
|
536 |
=head2 to_xml |
537 |
|
538 |
Convert (binary safe, I hope) your data into XML for C<swish-e>. |
539 |
Data will not yet be recoded to UTF-8. L<"put_slice"> will do that. |
540 |
|
541 |
my $xml = $i->to_xml({ foo => 'bar' }); |
542 |
|
543 |
This function is extracted from L<"add"> method so that you can L<Memoize> it. |
544 |
If your data set has a lot of repeatable data, and memory is not a problem, you |
545 |
can add C<memoize_to_xml> option to L<"open_index">. |
546 |
|
547 |
=cut |
548 |
|
549 |
my %escape = ('<'=>'<', '>'=>'>', '&'=>'&', '"'=>'"'); |
550 |
my $escape_re = join '|' => keys %escape; |
551 |
|
552 |
sub to_xml { |
553 |
my $self = shift; |
554 |
|
555 |
my $data = shift || return; |
556 |
|
557 |
my $xml = qq{<xml>}; |
558 |
foreach my $tag (keys %$data) { |
559 |
my $content = $data->{$tag}; |
560 |
next if (! $content || $content eq ''); |
561 |
# save [cr/]lf before conversion to XML |
562 |
# $content =~ s/\n\r/##lf##/gs; |
563 |
# $content =~ s/\n/##lf##/gs; |
564 |
$content =~ s/($escape_re)/$escape{$1}/gs; |
565 |
$xml .= "<$tag><![CDATA[".$content."]]></$tag>"; |
566 |
} |
567 |
$xml .= qq{</xml>}; |
568 |
} |
569 |
|
570 |
sub _debug { |
571 |
my $self = shift; |
572 |
print STDERR "## ",@_,"\n" if ($self->{'debug'}); |
573 |
return; |
574 |
} |
575 |
|
576 |
1; |
577 |
__END__ |
578 |
|
579 |
|
580 |
=head1 Searching |
581 |
|
582 |
Searching is still conducted using L<SWISH::API>, but you have to glob |
583 |
index names. |
584 |
|
585 |
use SWISH::API; |
586 |
|
587 |
my $swish = SWISH::API->new( glob('index.swish-e/*') ); |
588 |
|
589 |
You can also alternativly create merged index (using C<merge> option) and |
590 |
not change your source code at all. |
591 |
|
592 |
That would also benefit performance, but it increases indexing time |
593 |
because merged indexes must be re-created on each indexing run. |
594 |
|
595 |
=head1 EXPORT |
596 |
|
597 |
Nothing by default. |
598 |
|
599 |
=head1 EXAMPLES |
600 |
|
601 |
Test script for this module uses all parts of API. It's also nice example |
602 |
how to use C<SWISH::Split>. |
603 |
|
604 |
=head1 SEE ALSO |
605 |
|
606 |
L<SWISH::API>, |
607 |
L<http://www.swish-e.org/> |
608 |
|
609 |
=head1 AUTHOR |
610 |
|
611 |
Dobrica Pavlinusic, E<lt>dpavlin@rot13.orgE<gt> |
612 |
|
613 |
=head1 COPYRIGHT AND LICENSE |
614 |
|
615 |
Copyright (C) 2004 by Dobrica Pavlinusic |
616 |
|
617 |
This library is free software; you can redistribute it and/or modify |
618 |
it under the same terms as Perl itself, either Perl version 5.8.4 or, |
619 |
at your option, any later version of Perl 5 you may have available. |
620 |
|
621 |
|
622 |
=cut |