########################################################################### # # GreenstoneSQLPlugout.pm -- plugout module for writing all or some the # Greenstone document format (metadata and/or fulltext) into a (My)SQL db. # The rest is then still written out by GreenstoneXMLPlugout as usual. # A component of the Greenstone digital library software # from the New Zealand Digital Library Project at the # University of Waikato, New Zealand. # # Copyright (C) 2006 New Zealand Digital Library Project # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. # ########################################################################### package GreenstoneSQLPlugout; use strict; no strict 'refs'; no strict 'subs'; use GreenstoneXMLPlugout; use docprint; use gsmysql; use DBI; # the central package for this plugout # This plugout does not output the metadata and/or fulltxt xml to a file, # but outputs rows into a MySQL db table for metadata and/or a db table for fulltxt sub BEGIN { @GreenstoneSQLPlugout::ISA = ('GreenstoneXMLPlugout'); } my $process_mode_list = [ { 'name' => "meta_only", 'desc' => "{GreenstoneSQLPlug.process_mode.meta_only}" }, { 'name' => "text_only", 'desc' => "{GreenstoneSQLPlug.process_mode.text_only}" }, { 'name' => "all", 'desc' => "{GreenstoneSQLPlug.process_mode.all}" } ]; my $rollback_on_cancel_list = [ { 'name' => "true", 'desc' => "{GreenstoneSQLPlug.rollback_on_cancel}" }, { 'name' => "false", 'desc' => "{GreenstoneSQLPlug.rollbacl_on_cancel}" } ]; # The following are the saveas.options: my $arguments = [ { 'name' => "process_mode", 'desc' => "{GreenstoneSQLPlug.process_mode}", 'type' => "enum", 'list' => $process_mode_list, 'deft' => "all", 'reqd' => "no", 'hiddengli' => "no"}, { 'name' => "rollback_on_cancel", 'desc' => "{GreenstoneSQLPlug.rollback_on_cancel}", 'type' => "enum", 'list' => $rollback_on_cancel_list, 'deft' => "false", # better default than true 'reqd' => "no", 'hiddengli' => "no"}, { 'name' => "db_driver", 'desc' => "{GreenstoneSQLPlug.db_driver}", 'type' => "string", 'deft' => "mysql", 'reqd' => "yes"}, { 'name' => "db_client_user", 'desc' => "{GreenstoneSQLPlug.db_client_user}", 'type' => "string", 'deft' => "root", 'reqd' => "yes"}, { 'name' => "db_client_pwd", 'desc' => "{GreenstoneSQLPlug.db_client_pwd}", 'type' => "string", 'deft' => "", 'reqd' => "no"}, # pwd not required: can create mysql accounts without pwd { 'name' => "db_host", 'desc' => "{GreenstoneSQLPlug.db_host}", 'type' => "string", 'deft' => "127.0.0.1", # localhost doesn't work for us, but 127.0.0.1 works. See gsmysql.pm 'reqd' => "yes"}, { 'name' => "db_port", 'desc' => "{GreenstoneSQLPlug.db_port}", 'type' => "string", # NOTE: make this int? No default for port, since it's not a required connection param 'reqd' => "no"} ]; my $options = { 'name' => "GreenstoneSQLPlugout", 'desc' => "{GreenstoneSQLPlugout.desc}", 'abstract' => "no", 'inherits' => "yes", 'args' => $arguments }; ##### This entire class is called only during import.pl ##### ##### Overridden methods ##### sub new { my ($class) = shift (@_); my ($plugoutlist, $inputargs,$hashArgOptLists) = @_; push(@$plugoutlist, $class); push(@{$hashArgOptLists->{"ArgList"}},@{$arguments}); push(@{$hashArgOptLists->{"OptList"}},$options); my $self = new GreenstoneXMLPlugout($plugoutlist,$inputargs,$hashArgOptLists); if ($self->{'info_only'}) { # don't worry about any options etc return bless $self, $class; } return bless $self, $class; } # connect here and ensure all tables and databases exist sub begin { my $self= shift (@_); my $db_params = { 'collection_name' => $ENV{'GSDLCOLLECTION'}, 'verbosity' => $self->{'verbosity'} || 0 }; my $gs_sql = new gsmysql($db_params); # if autocommit is set, there's no rollback support my $autocommit = ($self->{'rollback_on_cancel'} eq "false") ? 1 : 0; # try connecting to the mysql db, die if that fails # So don't bother preparing GreenstoneXMLPlugout by calling superclass' begin() yet if(!$gs_sql->connect_to_db({ 'db_driver' => $self->{'db_driver'}, 'db_client_user' => $self->{'db_client_user'}, 'db_client_pwd' => $self->{'db_client_pwd'}, 'db_host' => $self->{'db_host'}, 'db_port' => $self->{'db_port'}, # undef by default, can leave as is 'autocommit' => $autocommit }) ) { # This is fatal for the plugout, let's terminate here # PrintError would already have displayed the warning message on connection fail die("Could not connect to db. Can't proceed.\n"); } my $db_name = $self->{'site'} || "greenstone2"; # one database per GS3 site, for GS2 the db is called greenstone2 my $proc_mode = $self->{'process_mode'}; my $success = $gs_sql->use_db($db_name); if($success && $proc_mode ne "text_only") { $success = $gs_sql->ensure_meta_table_exists(); } if($success && $proc_mode ne "meta_only") { $success = $gs_sql->ensure_fulltxt_table_exists(); } if(!$success) { # This is fatal for the plugout, let's terminate here after disconnecting again # PrintError would already have displayed the warning message on load fail # And on die() perl will call gsmysql destroy which will ensure a disconnect() from db die("Could not use db $db_name and/or prepare its tables. Can't proceed.\n"); } # store the DBI wrapper instance $self->{'gs_sql'} = $gs_sql; # If setting up connection to sql db failed, we'd have terminated and wouldn't come up to here # and wouldn't have bothered preparing GreenstoneXMLPlugout by calling superclass' begin(). # Finally, can call begin on super - important as doc.xml is opened as a group etc $self->SUPER::begin(@_); } # disconnect from database here, see inexport.pm sub end { my $self = shift(@_); # do the superclass stuff first, as any sql db failures should not prevent superclass cleanup $self->SUPER::end(@_); # Important to call finished(): # it will disconnect from db if this is the last gsmysql instance, # and it will commit to db before disconnecting if rollbback_on_cancel turned on $self->{'gs_sql'}->finished(); delete $self->{'gs_sql'}; # key gs_sql no longer exists, not just the value being undef } # Produce files called docsql.xml instead of doc.xml sub get_doc_xml_filename { my $self = shift (@_); my ($doc_obj) = @_; return "docsql.xml"; } # overriding to store doc OID as attribute of top level element: sub output_xml_header { my $self = shift (@_); my ($outhandle, $doc_oid) = @_; print $outhandle '' . "\n"; print $outhandle "\n"; print $outhandle "\n"; } # saveas() only generates the content in archives dir and in the SQL database sub saveas { my $self = shift (@_); my ($doc_obj, $doc_dir) = @_; my $proc_mode = $self->{'process_mode'}; # 1. pre save out and saving debug handle # must call superclass (pre/post) saveas methods, as they handle assoc_files too my ($docxml_outhandler, $output_file) = $self->SUPER::pre_saveas(@_); $self->{'debug_outhandle'} = $docxml_outhandler if ($self->{'debug'}); # STDOUT if debug # 2. overriding saving behaviour to do what the superclass does (writing out doc.xml files, # under new name of docsql.xml, with breadcrumbs pointing to sql db) PLUS saving to sql db # NOTE: if proc_mode == all, then "breadcrumbs" (statements pointing viewer to the sql db # for contents) go into both meta and txt elements of doc.xml (docsql.xml specifically): # write the INVERSE into doc.xml as to what is written to the SQL db my $docxml_output_options = { 'output' => docprint::OUTPUT_NONE }; if($proc_mode eq "meta_only" ) { # since only meta to go into MySQL db, text will go into docxml $docxml_output_options->{'output'} = docprint::OUTPUT_TEXT_ONLY; } elsif($proc_mode eq "text_only" ) { # since only full text to go into MySQL db, meta will go into docxml $docxml_output_options->{'output'} = docprint::OUTPUT_META_ONLY; } # now we've prepared to write out whatever is meant to go into docxml # and can do actual the steps superclass GreenstoneXMLPlugout carries out to write out docxml # So: write out the doc xml file, "docsql.xml", for the current document my $section_text = &docprint::get_section_xml($doc_obj, $docxml_output_options); print $docxml_outhandler $section_text; # We also write out whatever needs to go into the MySQL database $self->write_meta_and_text($doc_obj); # 3. post save out $self->SUPER::post_saveas($doc_obj, $doc_dir, $docxml_outhandler, $output_file); # database connection is closed once, in end() method # We're not opening and closing over and over for each doc during a single build } ##### New methods, not inherited ##### # write meta and/or text PER DOC out to DB sub write_meta_and_text { my $self = shift (@_); my ($doc_obj) = @_; my $doc_oid = $doc_obj->get_OID(); # this method processes a single doc at a time, so it uses the same OID throughout my $root_section = $doc_obj->get_top_section(); $self->recursive_write_meta_and_text($doc_obj, $doc_oid, $root_section); } sub recursive_write_meta_and_text { my $self = shift (@_); my ($doc_obj, $doc_oid, $section) = @_; # If section=ROOT, write "root" as section name into table # doc->get_top_section() is the name of the doc root section, which is "" my $section_name = ($section eq "") ? "root" : $section; my $section_ptr = $doc_obj->_lookup_section ($section); return "" unless defined $section_ptr; my $debug_out = $self->{'debug_outhandle'}; my $gs_sql = $self->{'gs_sql'}; my $proc_mode = $self->{'process_mode'}; if($proc_mode eq "all" || $proc_mode eq "meta_only" ) { foreach my $data (@{$section_ptr->{'metadata'}}) { my $meta_name = $data->[0]; # Treat db like a text file instead of an html/xml file: don't need to escape text # going into it, unlike with doc(sql).xml my $meta_value = $data->[1]; # Write out the current section's meta to collection db's METADATA table # For each set of values to write to meta table, this next method call will # efficiently execute an insert SQL statement (using a prepared insert statement), # filling in the values # OR if debugging, then it will print the SQL insert statement but not execute it # (a behaviour following what the GS XML Plugout superclass does on debug) $gs_sql->insert_row_into_metadata_table($doc_oid, $section_name, $meta_name, $meta_value, $self->{'debug'}); } } if($proc_mode eq "all" || $proc_mode eq "text_only" ) { # See above, no need to html-escape for db my $section_text = $section_ptr->{'text'}; # fulltxt column can be SQL NULL. undef value for $section_text gets written out as NULL: # https://stackoverflow.com/questions/12708633/which-one-represents-null-undef-or-empty-string # The following will do the SQL insertion # or if debug, the following will print the SQL insert stmt without executing it $gs_sql->insert_row_into_fulltxt_table($doc_oid, $section_name, \$section_text, $self->{'debug'}); } # output all subsections: RECURSIVE CALL foreach my $subsection (@{$section_ptr->{'subsection_order'}}) { $self->recursive_write_meta_and_text($doc_obj, $doc_oid, "$section.$subsection"); } } 1;