source: main/trunk/greenstone2/perllib/plugouts/GreenstoneSQLPlugout.pm@ 32559

Last change on this file since 32559 was 32559, checked in by ak19, 5 years ago

Removing db_encoding as parameters to GreenstoneSQLPlugout and GreenstoneSQLPlugin: as doc.xml is always in utf8, the same contents stored in the MySQL db should be too.
File size: 15.0 KB
Line 
1###########################################################################
2#
3# GreenstoneSQLPlugout.pm -- plugout module for writing all or some the
4# Greenstone document format (metadata and/or fulltext) into a (My)SQL db.
5# The rest is then still written out by GreenstoneXMLPlugout as usual.
6# A component of the Greenstone digital library software
7# from the New Zealand Digital Library Project at the
8# University of Waikato, New Zealand.
9#
10# Copyright (C) 2006 New Zealand Digital Library Project
11#
12# This program is free software; you can redistribute it and/or modify
13# it under the terms of the GNU General Public License as published by
14# the Free Software Foundation; either version 2 of the License, or
15# (at your option) any later version.
16#
17# This program is distributed in the hope that it will be useful,
18# but WITHOUT ANY WARRANTY; without even the implied warranty of
19# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20# GNU General Public License for more details.
21#
22# You should have received a copy of the GNU General Public License
23# along with this program; if not, write to the Free Software
24# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25#
26###########################################################################
27
28package GreenstoneSQLPlugout;
29
30use strict;
31no strict 'refs';
32no strict 'subs';
33
34use GreenstoneXMLPlugout;
35use docprint;
36use gssql;
37
38use DBI; # the central package for this plugout
39
40
41# TODO: SIGTERM rollback and disconnect?
42# TODO Q: what about verbosity for debugging, instead of current situation of printing out upon debug set at the expense of writing to db
43# TODO Q: introduced site_name param to plugins and plugouts. Did I do it right? And should they have hiddengli = "yes"
44
45# this plugout does not output the metadata and/or fulltxt xml to a file,
46# but outputs rows into a mysql table for metadata and/or a table for fulltxt
47sub BEGIN {
48 @GreenstoneSQLPlugout::ISA = ('GreenstoneXMLPlugout');
49}
50
51# NOTTODO: die() statements need to be replaced with premature_termination
52# which should ensure the GreenstoneXMLPlugin (group)'s stuff is closed and cleaned up SOMEHOW
53# It's fine: the die() stmts all take place before setting up the super class' begin
54
55# TODO Q: about build_mode: how to detect removeold
56# TODO: deal with -removeold and everything? Or type out instructions for user
57
58# TODO Q: what is "group" in GreenstoneXMLPlugout?
59
60my $process_mode_list =
61 [ { 'name' => "meta_only",
62 'desc' => "{GreenstoneSQLPlug.process_mode.meta_only}" },
63 { 'name' => "text_only",
64 'desc' => "{GreenstoneSQLPlug.process_mode.text_only}" },
65 { 'name' => "all",
66 'desc' => "{GreenstoneSQLPlug.process_mode.all}" } ];
67
68# The following are the saveas.options:
69my $arguments = [
70 { 'name' => "process_mode",
71 'desc' => "{GreenstoneSQLPlug.process_mode}",
72 'type' => "enum",
73 'list' => $process_mode_list,
74 'deft' => "all",
75 'reqd' => "no",
76 'hiddengli' => "no"},
77 { 'name' => "db_driver",
78 'desc' => "{GreenstoneSQLPlug.db_driver}",
79 'type' => "string",
80 'deft' => "mysql",
81 'reqd' => "yes"},
82 { 'name' => "db_client_user",
83 'desc' => "{GreenstoneSQLPlug.db_client_user}",
84 'type' => "string",
85 'deft' => "root",
86 'reqd' => "yes"},
87 { 'name' => "db_client_pwd",
88 'desc' => "{GreenstoneSQLPlug.db_client_pwd}",
89 'type' => "string",
90 'deft' => "",
91 'reqd' => "yes"}, # pwd required?
92 { 'name' => "db_host",
93 'desc' => "{GreenstoneSQLPlug.db_host}",
94 'type' => "string",
95 'deft' => "127.0.0.1",
96 'reqd' => "yes"}
97 ];
98
99my $options = { 'name' => "GreenstoneSQLPlugout",
100 'desc' => "{GreenstoneSQLPlugout.desc}",
101 'abstract' => "no",
102 'inherits' => "yes",
103 'args' => $arguments };
104
105sub new {
106 my ($class) = shift (@_);
107 my ($plugoutlist, $inputargs,$hashArgOptLists) = @_;
108 push(@$plugoutlist, $class);
109
110 push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
111 push(@{$hashArgOptLists->{"OptList"}},$options);
112
113 my $self = new GreenstoneXMLPlugout($plugoutlist,$inputargs,$hashArgOptLists);
114
115 if ($self->{'info_only'}) {
116 # don't worry about any options etc
117 return bless $self, $class;
118 }
119 print STDERR "***** GreenstoneSQLPlugout process mode = \"", $self->{'process_mode'}, "\"\n";
120
121 return bless $self, $class;
122}
123
124# connect here and ensure all tables and databases exist
125sub begin {
126
127 my $self= shift (@_);
128
129 # The saveas.options
130 #print STDERR "@@@@ PLUGOUT db_pwd: " . $self->{'db_client_pwd'} . "\n";
131 #print STDERR "@@@@ user: " . $self->{'db_client_user'} . "\n";
132 #print STDERR "@@@@ db_host: " . $self->{'db_host'} . "\n";
133 #print STDERR "@@@@ db_driver: " . $self->{'db_driver'} . "\n";
134 #print STDERR "@@@@ proc_mode: " . $self->{'process_mode'} . "\n";
135
136 ############ LOAD NECESSARY OPTIONS ###########
137 #print "@@@ plugout SITE NAME: ". $self->{'site_name'} . "\n" if defined $self->{'site_name'};
138 #print STDERR "########## COLLECTION: ". $ENV{'GSDLCOLLECTION'}."\n";
139
140 print STDERR "***** GreenstoneSQLPlugout process mode = \"", $self->{'process_mode'}, "\"\n";
141
142 my $db_params = {
143 'collection_name' => $ENV{'GSDLCOLLECTION'}
144 };
145
146 my $gs_sql = new gssql($db_params);
147
148 # try connecting to the mysql db, if that fails it will die
149 # so don't bother preparing GreenstoneXMLPlugout by calling superclass' begin()
150 if(!$gs_sql->connect_to_db({
151 'db_driver' => $self->{'db_driver'},
152 'db_client_user' => $self->{'db_client_user'},
153 'db_client_pwd' => $self->{'db_client_pwd'},
154 'db_host' => $self->{'db_host'}
155 })
156 )
157 {
158 # This is fatal for the plugout, let's terminate here
159 # PrintError would already have displayed the warning message on connection fail
160 die("Could not connect to db. Can't proceed.\n");
161 }
162
163 my $db_name = $self->{'site_name'} || "greenstone2"; # one database per GS3 site, for GS2 the db is called greenstone2
164 my $build_mode = ($self->{'removeold'}) ? "removeold" : "incremental";
165 print STDERR "@@@@@@@@@@@@ remove_old: $build_mode\n";
166
167 if(!$gs_sql->load_db_and_tables($db_name, $build_mode)) {
168
169 # This is fatal for the plugout, let's terminate here after disconnecting again
170 # PrintError would already have displayed the warning message on load fail
171 $gs_sql->disconnect_from_db()
172 || warn("Unable to disconnect from database.\n");
173 die("Could not use db $db_name and/or prepare its tables. Can't proceed.\n");
174 }
175
176 # prepare the shared/common HANDLES to SQL insert statements that contain placeholders
177 # and which we will reuse repeatedly when actually executing the insert statements
178 my $proc_mode = $self->{'process_mode'};
179 if($proc_mode eq "all" || $proc_mode eq "meta_only" ) {
180 $self->{'metadata_prepared_insert_statement_handle'} = $gs_sql->prepare_insert_metadata_row_stmthandle();
181 }
182 if($proc_mode eq "all" || $proc_mode eq "text_only" ) {
183 $self->{'fulltxt_prepared_insert_statement_handle'} = $gs_sql->prepare_insert_fulltxt_row_stmthandle();
184 }
185
186 # store the DBI wrapper instance
187 $self->{'gs_sql'} = $gs_sql;
188
189 print STDERR "#### Meta stmt: " . $self->{'metadata_prepared_insert_statement_handle'}->{'Statement'} . "\n";
190 print STDERR "#### Full stmt: " . $self->{'fulltxt_prepared_insert_statement_handle'}->{'Statement'} . "\n";
191
192 # if setting up to work with sql db failed, we'd have terminated and wouldn't come up to here:
193 # won't bother preparing GreenstoneXMLPlugout by calling superclass' begin()
194 # finally, can call begin on super - important as doc.xml is opened as a group etc
195
196 $self->SUPER::begin(@_);
197}
198
199# disconnect from database here, see inexport.pm
200sub end
201{
202 my $self = shift(@_);
203
204 # do the superclass stuff first, as any sql db failures should not prevent superclass cleanup
205 $self->SUPER::end(@_);
206
207 $self->{'gs_sql'}->disconnect_from_db() || warn("Unable to disconnect from database " . $self->{'site_name'} . "\n"); # disconnect_from_db() will also issue a warning, but this may be clearer
208}
209
210# Produce files called docsql.xml instead of doc.xml
211sub get_doc_xml_filename {
212 my $self = shift (@_);
213 my ($doc_obj) = @_;
214
215 return "docsql.xml";
216}
217
218# overriding to store doc OID as attribute of top level element: <Archive docoid="oid">
219sub output_xml_header {
220 my $self = shift (@_);
221 my ($outhandle, $doc_oid) = @_;
222
223 print $outhandle '<?xml version="1.0" encoding="utf-8" standalone="no"?>' . "\n";
224 print $outhandle "<!DOCTYPE Archive SYSTEM \"http://greenstone.org/dtd/Archive/1.0/Archive.dtd\">\n";
225 print $outhandle "<Archive docoid=\"$doc_oid\">\n";
226}
227
228# TODO: check arc-inf.db for whether each entry is to be deleted/indexed/reindexed/been indexed?
229# That's only for indexing, not for this step which only generates the content in archives dir
230sub saveas {
231 my $self = shift (@_);
232 my ($doc_obj, $doc_dir) = @_;
233
234# print STDERR "\n\n@@@ In saveas\n\n";
235
236 my $proc_mode = $self->{'process_mode'};
237
238 # 1. pre save out and saving debug handle
239
240 # must call superclass (pre/post) saveas methods, as they handle assoc_files too
241 my ($docxml_outhandler, $output_file) = $self->SUPER::pre_saveas(@_);
242
243 $self->{'debug_outhandle'} = $docxml_outhandler if ($self->{'debug'}); # STDOUT if debug
244
245 # TODO: also set debugging in begin()? Then stmts creating db and tables also sent to debug out and not executed
246
247
248 # 2. overriding saving behaviour to do what the superclass does (writing out doc.xml files,
249 # under new name of docsql.xml, with breadcrumbs pointing to sql db) PLUS saving to sql db
250
251 # NOTE: if proc_mode == all, then "breadcrumbs" (statements pointing viewer to the sql db
252 # for contents) go into both meta and txt elements of doc.xml (docsql.xml specifically):
253
254 # write the INVERSE into doc.xml as to what is written to the SQL db
255 my $docxml_output_options = { 'output' => docprint::OUTPUT_NONE };
256 if($proc_mode eq "meta_only" ) { # since only meta to go into MySQL db, text will go into docxml
257 $docxml_output_options->{'output'} = docprint::OUTPUT_TEXT_ONLY;
258 } elsif($proc_mode eq "text_only" ) { # since only full text to go into MySQL db, meta will go into docxml
259 $docxml_output_options->{'output'} = docprint::OUTPUT_META_ONLY;
260 }
261
262 # now we've prepared to write out whatever is meant to go into docxml
263 # and can do actual the steps superclass GreenstoneXMLPlugout carries out to write out docxml
264 # So: write out the doc xml file, "docsql.xml", for the current document
265 my $section_text = &docprint::get_section_xml($doc_obj, $docxml_output_options);
266 print $docxml_outhandler $section_text;
267
268
269 # We also write out whatever needs to go into the MySQL database
270 $self->write_meta_and_text($doc_obj);
271
272
273 # 3. post save out
274 #$self->SUPER::post_saveas(@_);
275 $self->SUPER::post_saveas($doc_obj, $doc_dir, $docxml_outhandler, $output_file);
276
277
278 # database connection is closed in end() method
279 # so we don't open and close over and over for each doc during a single build
280}
281
282
283# write meta and/or text PER DOC out to DB
284sub write_meta_and_text {
285 my $self = shift (@_);
286 my ($doc_obj) = @_;
287 my $doc_oid = $doc_obj->get_OID(); # this method processes a single doc at a time, so it uses the same OID throughout
288 my $root_section = $doc_obj->get_top_section();
289
290 # load the prepared INSERT statement handles for both tables (can be undef for any table depending on whether meta_only or txt_only are set)
291 my $metadata_table_sth = $self->{'metadata_prepared_insert_statement_handle'};
292 my $fulltxt_table_sth = $self->{'fulltxt_prepared_insert_statement_handle'};
293
294 $self->recursive_write_meta_and_text($doc_obj, $doc_oid, $root_section, $metadata_table_sth, $fulltxt_table_sth);
295}
296
297# Perl: Reading or Writing to Another Program
298# https://nnc3.com/mags/Perl3/cookbook/ch16_05.htm
299sub recursive_write_meta_and_text {
300 my $self = shift (@_);
301 my ($doc_obj, $doc_oid, $section, $metadata_table_sth, $fulltxt_table_sth) = @_;
302
303 # If section=ROOT, write "root" as section name into table
304 # doc->get_top_section() is the name of the doc root section, which is ""
305 my $section_name = ($section eq "") ? "root" : $section;
306
307 my $section_ptr = $doc_obj->_lookup_section ($section);
308 return "" unless defined $section_ptr;
309
310 my $debug_out = $self->{'debug_outhandle'};
311# print STDERR "#### Meta stmt: " . $metadata_table_sth->{'Statement'} . "\n";
312# print STDERR "#### Full stmt: " . $fulltxt_table_sth->{'Statement'} . "\n";
313
314 #my $proc_mode = $self->{'process_mode'};
315 #if($proc_mode eq "all" || $proc_mode eq "meta_only" ) {
316 if($metadata_table_sth) { # meta insert statement handle will be undef if not writing meta
317
318 foreach my $data (@{$section_ptr->{'metadata'}}) {
319 my $meta_name = $data->[0];
320 # TODO: does it need to be stored escaped, as it requires unescaping when read back in
321 # from db (unlike for reading back in from doc.xml)
322 my $escaped_meta_value = &docprint::escape_text($data->[1]);
323
324 # Write out the current section's meta to collection db's METADATA table
325
326 # for each set of values to write to meta table, execute the prepared statement, filling in the values
327
328 if($self->{'debug'}) {
329 # just print the statement we were going to execute
330
331 print $debug_out $metadata_table_sth->{'Statement'} . "($doc_oid, $section_name, $meta_name, $escaped_meta_value)\n";
332 }
333 else {
334
335 $metadata_table_sth->execute($doc_oid, $section_name, $meta_name, $escaped_meta_value)
336 || warn ("Unable to write metadata row to db:\n\tOID $doc_oid, section $section_name,\n\tmeta name: $meta_name, val: $escaped_meta_value");
337 # Execution failure will print out info anyway: since db connection sets PrintError
338 }
339 }
340 }
341
342 #if($proc_mode eq "all" || $proc_mode eq "text_only" ) {
343 if($fulltxt_table_sth) { # fulltxt insert statement handle will be undef if not writing fulltxt
344
345 if($self->{'debug'}) {
346 # just print the statement we were going to execute, minus the fulltxt value
347 my $txt_repr = $section_ptr->{'text'} ? "<TXT>" : "NULL";
348 print $debug_out $fulltxt_table_sth->{'Statement'} . "($doc_oid, $section_name, $txt_repr)\n";
349 } else {
350 my $section_text = &docprint::escape_text($section_ptr->{'text'});
351
352 # fulltxt column can be SQL NULL. undef value gets written out as NULL:
353 # https://stackoverflow.com/questions/12708633/which-one-represents-null-undef-or-empty-string
354
355 # Write out the current section's text to collection db's FULLTeXT table
356 $fulltxt_table_sth->execute($doc_oid, $section_name, $section_text)
357 || warn ("Unable to write fulltxt row to db for row:\n\tOID $doc_oid, section $section_name");
358 # Execution failure will print out info anyway: since db connection sets PrintError
359 }
360 }
361
362 # output all subsections: RECURSIVE CALL
363 foreach my $subsection (@{$section_ptr->{'subsection_order'}}) {
364 $self->recursive_write_meta_and_text($doc_obj, $doc_oid, "$section.$subsection", $metadata_table_sth, $fulltxt_table_sth);
365 }
366}
367
368
3691;
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