[32518] | 1 | ###########################################################################
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| 2 | #
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| 3 | # GreenstoneXMLPlugout.pm -- the plugout module for Greenstone Archives
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| 4 | # A component of the Greenstone digital library software
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| 5 | # from the New Zealand Digital Library Project at the
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| 6 | # University of Waikato, New Zealand.
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| 7 | #
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| 8 | # Copyright (C) 2006 New Zealand Digital Library Project
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| 9 | #
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| 10 | # This program is free software; you can redistribute it and/or modify
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| 11 | # it under the terms of the GNU General Public License as published by
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| 12 | # the Free Software Foundation; either version 2 of the License, or
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| 13 | # (at your option) any later version.
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| 14 | #
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| 15 | # This program is distributed in the hope that it will be useful,
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| 16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 18 | # GNU General Public License for more details.
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| 19 | #
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| 20 | # You should have received a copy of the GNU General Public License
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| 21 | # along with this program; if not, write to the Free Software
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| 22 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 23 | #
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| 24 | ###########################################################################
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| 25 |
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| 26 | package MySQLPlugout;
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| 27 |
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| 28 | use strict;
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| 29 | no strict 'refs';
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| 30 | no strict 'subs';
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| 31 |
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| 32 | use util;
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| 33 | use FileUtils;
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| 34 | use BasePlugout;
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| 35 | use docprint;
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| 36 |
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| 37 | use IPC::Open2;
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| 38 | use POSIX ":sys_wait_h"; # for waitpid, http://perldoc.perl.org/functions/waitpid.html
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| 39 |
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| 40 | # this plugout does not output xml to a file, but outputs rows into a mysql table
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| 41 | sub BEGIN {
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| 42 | @MySQLPlugout::ISA = ('GreenstoneXMLPlugout');
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| 43 | }
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| 44 |
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| 45 | # TODO Q: what is "group" in GreenstoneXMLPlugout?
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| 46 |
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| 47 | my $process_mode_list =
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| 48 | [ { 'name' => "meta_only",
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| 49 | 'desc' => "{MySQLPlugout.process_mode.meta_only}" },
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| 50 | { 'name' => "text_only",
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| 51 | 'desc' => "{MySQLPlugout.process_mode.text_only}" },
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| 52 | { 'name' => "all",
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| 53 | 'desc' => "{MySQLPlugout.process_mode.all}" } ];
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| 54 |
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| 55 | my $arguments = [
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| 56 | { 'name' => "process_mode",
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| 57 | 'desc' => "{MySQLPlugout.process_mode}",
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| 58 | 'type' => "enum",
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| 59 | 'list' => $process_mode_list,
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| 60 | 'deft' => "all",
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| 61 | 'reqd' => "no",
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| 62 | 'hiddengli' => "no"} ];
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| 63 |
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| 64 | my $options = { 'name' => "MySQLPlugout",
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| 65 | 'desc' => "{MySQLPlugout.desc}",
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| 66 | 'abstract' => "no",
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| 67 | 'inherits' => "yes",
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| 68 | 'args' => $arguments };
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| 69 |
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| 70 | sub new {
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| 71 | my ($class) = shift (@_);
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| 72 | my ($plugoutlist, $inputargs,$hashArgOptLists) = @_;
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| 73 | push(@$plugoutlist, $class);
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| 74 |
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| 75 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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| 76 | push(@{$hashArgOptLists->{"OptList"}},$options);
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| 77 |
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| 78 | my $self = new GreenstoneXMLPlugout($plugoutlist,$inputargs,$hashArgOptLists);
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| 79 |
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| 80 | if ($self->{'info_only'}) {
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| 81 | # don't worry about any options etc
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| 82 | return bless $self, $class;
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| 83 | }
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| 84 | print STDERR "***** MySQLPlugout process mode = \"", $self->{'process_mode'}, "\"\n";
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| 85 |
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| 86 | return bless $self, $class;
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| 87 | }
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| 88 |
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| 89 | # TODO: check arc-inf.db for whether each entry is to be deleted/indexed/reindexed/been indexed
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| 90 | sub saveas {
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| 91 | my $self = shift (@_);
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| 92 | my ($doc_obj, $doc_dir) = @_;
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| 93 |
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| 94 | # pre
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| 95 | my ($docxml_outhandler, $output_file) = $self->GreenstoneXMLPlugout::pre_saveas(@_);
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| 96 |
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| 97 |
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| 98 | print STDERR "########## COLLECTION: ". $ENV{'GSDLCOLLECTION'}."\n";
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| 99 | $self->{'collection_name'} = $ENV{'GSDLCOLLECTION'};
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| 100 | # set up DB and table or connect to DB and access the table here?
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| 101 |
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| 102 | my $proc_mode = $self->{'process_mode'};
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| 103 | my $docxml_output_options = { 'output' => docprint::OUTPUT_NONE };
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| 104 | if($proc_mode eq "meta_only" ) { # since only meta to go into MySQL db, text will go into docxml
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| 105 | $docxml_output_options->{'output'} = docprint::OUTPUT_TEXT_ONLY;
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| 106 | } elsif($proc_mode eq "text_only" ) { # since only full text to go into MySQL db, meta will go into docxml
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| 107 | $docxml_output_options->{'output'} = docprint::OUTPUT_META_ONLY;
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| 108 | }
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| 109 |
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| 110 | # now we've prepared to write out whatever is meant to go into docxml
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| 111 | # and can do actual the steps superclass GreenstoneXMLPlugout carries out to write out docxml
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| 112 | # So: write out the doc xml file for the current document
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| 113 | my $section_text = &docprint::get_section_xml($doc_obj, $docxml_output_options);
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| 114 | print $docxml_outhandler $section_text;
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| 115 |
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| 116 | # We also write out whatever needs to go into the MySQL database
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| 117 | $self->write_meta_and_text($doc_obj);
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| 118 |
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| 119 | # post
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| 120 | $self->GreenstoneXMLPlugout::post_saveas(@_);
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| 121 |
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| 122 | # TODO: close database connection here? Or do something like with groups
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| 123 | # so we don't open and close over and over during a single build?
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| 124 | }
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| 125 |
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| 126 |
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| 127 | # write meta and/or text out to DB
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| 128 | sub write_meta_and_text {
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| 129 | my $self = shift (@_);
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| 130 | my ($doc_obj) = @_;
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| 131 | my $root_section = $doc_obj->get_top_section();
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| 132 |
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| 133 | # Do we don't want to open and close a connection per doc?
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| 134 | # Would we not rather want to open and close per collection rebuild?
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| 135 |
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| 136 | #$self->create_db_connection();
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| 137 |
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| 138 | $self->recursive_write_meta_and_text($doc_obj, $root_section);
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| 139 |
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| 140 | #$self->close_db_connection();
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| 141 | }
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| 142 | # Perl: Reading or Writing to Another Program
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| 143 | # https://nnc3.com/mags/Perl3/cookbook/ch16_05.htm
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| 144 | sub recursive_write_meta_and_text {
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| 145 | my ($doc_obj, $section) = @_;
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| 146 |
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| 147 | # TODO
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| 148 | my $db_outhandler = undef;
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| 149 | binmode($db_outhandler,":utf8");
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| 150 | # TODO if $self->debug is on
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| 151 |
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| 152 | my $section_ptr = $doc_obj->_lookup_section ($section);
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| 153 | return "" unless defined $section_ptr;
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| 154 |
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| 155 | my $proc_mode = $self->{'process_mode'};
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| 156 |
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| 157 | if($proc_mode eq "all" || $proc_mode eq "meta_only" ) {
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| 158 | foreach my $data (@{$section_ptr->{'metadata'}}) {
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| 159 | my $escaped_value = &escape_text($data->[1]);
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| 160 | my $metaval = $data->[0];
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| 161 | # TODO: write out current section's text to collection db's META table
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| 162 | }
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| 163 | }
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| 164 | if($proc_mode eq "all" || $proc_mode eq "text_only" ) {
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| 165 | my $section_text = &escape_text($section_ptr->{'text'});
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| 166 | # TODO: write out current section's text to collection db's TEXT table
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| 167 |
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| 168 | }
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| 169 |
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| 170 | # output all subsections: RECURSIVE CALL
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| 171 | foreach my $subsection (@{$section_ptr->{'subsection_order'}}) {
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| 172 | &recursive_write_meta_and_text($doc_obj, "$section.$subsection");
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| 173 | }
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| 174 | }
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| 175 |
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| 176 | #################################
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| 177 |
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| 178 | # Database access related functions
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| 179 | # http://g2pc1.bu.edu/~qzpeng/manual/MySQL%20Commands.htm
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| 180 | # https://www.guru99.com/insert-into.html
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| 181 |
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| 182 | # TODO Q: What on cancelling a build: delete table? But what if it was a rebuild and the rebuild is cancelled (not the original build)?
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| 183 | # Do we create a copy of the orig database as backup, then start populating current db, and if cancelled, delete current db and RENAME backup table to current?
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| 184 | # https://stackoverflow.com/questions/3280006/duplicating-a-mysql-table-indexes-and-data
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| 185 | # BUT what if the table is HUGE? (Think of a collection with millions of docs.) Huge overhead in copying?
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| 186 | # The alternative is we just quit on cancel, but then: cancel could leave the table in a partial committed state, with no way of rolling back.
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| 187 | # Unless they do a full rebuild, which will recreate the tab;e from scratch?
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| 188 |
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| 189 |
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| 190 | # I'm using perl's open2 like in Z3950Download, as opposed to open3 like in WgetDownload
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| 191 | # since I'm assuming each insert statement is atomic: it either does the insertion or fails
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| 192 | # and we (may) get some message back. That means we should hopefully be able to terminate
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| 193 | # as well if we get SIGTERM/SIGKILL: we're not blocking, but are responsive after every INSERT stmt.
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| 194 |
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| 195 | # Just runs the command without displaying it
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| 196 | sub run_command_basic
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| 197 | {
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| 198 | my ($self,$strCMD) = @_;
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| 199 |
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| 200 |
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| 201 | my $process_instr = $self->{'MYSQL_IN'};
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| 202 |
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| 203 | print $process_instr "$strCMD\n";
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| 204 | }
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| 205 |
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| 206 | sub run_command
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| 207 | {
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| 208 | my ($self,$strCMD) = @_;
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| 209 |
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| 210 | print STDERR "Running mysql command: $strCMD\n";
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| 211 | $self->run_command_basic($strCMD);
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| 212 |
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| 213 | }
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| 214 |
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| 215 | sub response_line_contains {
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| 216 | my ($self,$expected) = @_;
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| 217 |
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| 218 | my $opening_line = <$out>;
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| 219 | if ($opening_line =~ m/$expected/i) {
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| 220 | return 1;
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| 221 | }
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| 222 | return 0;
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| 223 | }
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| 224 |
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| 225 | sub response_lines_contain {
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| 226 | my ($self,$expected) = @_;
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| 227 |
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| 228 | my $found_expected = 0;
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| 229 | while (my $line = <$out>) {
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| 230 | print STDERR "$line\n";
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| 231 | if($line =~ m/$expected/){
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| 232 | #return 1;
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| 233 | $found_expected = 1; #won't break out of loop: loop will consume all on child out at present
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| 234 | }
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| 235 | }
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| 236 | return $found_expected;
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| 237 | }
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| 238 |
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| 239 | # based on Z3950Download.pm::start_yaz()
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| 240 | # ./PATH/TO/mysql -u root -p
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| 241 | # Returns:
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| 242 | # - 1 if client already quit after pwd fail (so can't send quit message to stopped client)
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| 243 | # - 0 if load_db failed (needs to be quit),
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| 244 | # - 1 if load_db succeeded (mysql client still running)
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| 245 | sub create_db_connection {
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| 246 | my $self = shift (@_);
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| 247 | print STDERR "Opening connection to MySQL db\n";
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| 248 |
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| 249 | my $mysql_client = $self->{'client_path'};
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| 250 | my $client_user = $self->{'client_user'} || "root";
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| 251 |
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| 252 |
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| 253 | my $launch_cmd = "\"./$mysql_client\" -u $clientuser -p";
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| 254 | my $childpid = open2(*MYSQL_OUT, *MYSQL_IN, $launch_cmd)
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| 255 | or (print STDERR "Done\n" and die "can't open2 pipe to mysql client: $!");
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| 256 |
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| 257 | $self->{'pid'} = $childpid;
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| 258 | $self->{'MYSQL_OUT'} = *MYSQL_OUT;
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| 259 | $self->{'MYSQL_IN'} = *MYSQL_IN;
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| 260 |
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| 261 | # connect with pwd and load the database for this site
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| 262 | #my $conn_open = $self->open_connection();
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| 263 | #
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| 264 | #if (!$conn_open) {
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| 265 | # print STDERR "Cannot connect to mysql db with $launch_cmd\n";
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| 266 | # print STDERR "Done\n";
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| 267 | # return 0;
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| 268 | #}
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| 269 |
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| 270 | # connect with pwd
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| 271 | my $conn_success = $self->send_pwd();
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| 272 | if(!$conn_success) {
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| 273 | return -1; # if pwd failed, then the program already exited by itself
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| 274 | # (so don't send quit command after process terminated)
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| 275 | }
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| 276 | else {
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| 277 | return $self->load_db();
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| 278 | }
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| 279 |
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| 280 | return $conn_open; # 1 if client already quit after pwd fail, 0 if load_db failed (needs to be quit), 1 if load_db succeeded (mysql client still running)
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| 281 | }
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| 282 |
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| 283 |
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| 284 | # Copied from Z3950Download.pm::quit_yaz()
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| 285 | sub close_db_connection {
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| 286 | my $self = shift (@_);
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| 287 |
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| 288 | $self->run_command("quit");
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| 289 | close($self->{'MYSQL_IN'}); # close the input to yaz. It also flushes quit command to mysql client
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| 290 |
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| 291 | # make sure nothing is being output by mysql client
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| 292 | # flush the mysql-client process' outputstream, else we'll be stuck in an infinite
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| 293 | # loop waiting for the process to quit.
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| 294 | my $output = $self->{'MYSQL_OUT'};
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| 295 | my $line;
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| 296 | while (defined ($line = <$output>)) {
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| 297 | if($line !~ m/\w/s) { # print anything other than plain whitespace in case it is important
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| 298 | print STDERR "***### $line";
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| 299 | }
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| 300 | }
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| 301 |
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| 302 | close($self->{'MYSQL_OUT'});
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| 303 |
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| 304 | # Is the following necessary? The PerlDoc on open2 (http://perldoc.perl.org/IPC/Open2.html)
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| 305 | # says that waitpid must be called to "reap the child process", or otherwise it will hang
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| 306 | # around like a zombie process in the background. Adding it here makes the code work as
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| 307 | # before, but it is certainly necessary to call waitpid on wget (see WgetDownload.pm).
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| 308 | # http://perldoc.perl.org/functions/waitpid.html
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| 309 | my $kidpid;
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| 310 | do {
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| 311 | $kidpid = waitpid($self->{'pid'}, WNOHANG);
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| 312 | } while $kidpid > 0; # waiting for pid to become -1
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| 313 | }
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| 314 |
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| 315 | # should be called only once per site
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| 316 | sub create_database {
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| 317 | my $self = shift (@_);
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| 318 | #my $sitename = shift(@_);
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| 319 | my $sitename = $self->{'site_name'};
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| 320 | my $cmd = "CREATE DATABASE $sitename;";
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| 321 | $self->run_command($cmd);
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| 322 | }
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| 323 |
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| 324 |
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| 325 | sub send_pwd {
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| 326 | my $self = shift (@_);
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| 327 |
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| 328 | my $client_pwd = $self->{'client_pwd'};
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| 329 | my $out = $self->{'MYSQL_OUT'};
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| 330 |
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| 331 | # if connected, it's prompting for pwd. Write the pwd to the mysql client process:
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| 332 | $self->run_command_basic($client_pwd);
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| 333 |
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| 334 | #my $opening_line = <$out>;
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| 335 | #if ($opening_line =~ m/Access denied/i) {
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| 336 | #print STDERR "Password not recognised. Got: $opening_line\n";
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| 337 | #return 0;
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| 338 | #}
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| 339 |
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| 340 | if($self->response_line_contains("Access denied")) {
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| 341 | print STDERR "Password not recognised. Got: $opening_line\n";
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| 342 | return 0;
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| 343 | }
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| 344 |
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| 345 | return 1;
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| 346 | }
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| 347 |
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| 348 |
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| 349 | sub load_db {
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| 350 | my $self = shift (@_);
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| 351 |
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| 352 | # attempt to load the db
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| 353 | # use the database
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| 354 | my $db_name = $self->{'site_name'}; # TODO Q: site_name only exists for GS3. What about GS2?
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| 355 | $self->run_command("use " . $db_name . ";");
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| 356 |
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| 357 | my $db_found = 0;
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| 358 | while (my $line = <$out>) {
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| 359 | print STDERR "$line\n";
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| 360 | if($line =~ m/Database changed/){
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| 361 | # return 1; # TODO Q: consume all output of running command
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| 362 | $db_found = 1;
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| 363 | }
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| 364 | elsif($line =~ m/Unknown database/){
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| 365 | $db_found = -1;
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| 366 | }
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| 367 | }
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| 368 |
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| 369 | if($db_found == 1) {
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| 370 | return $db_found;
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| 371 | }
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| 372 | elsif ($db_found == -1) { # a db for the current sitename didn't exist, create it
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| 373 | $self->create_database();
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| 374 |
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| 375 | # attempt to load the newly created db
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| 376 | if($self->_load_db()) {
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| 377 | return 1;
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| 378 | }
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| 379 | #my $opening_line = <$out>;
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| 380 | #if ($opening_line !~ m/Query OK/) {
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| 381 | if(!$self->response_line_contains("Query OK")) {
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| 382 | print STDERR "Could not create db\n";
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| 383 | return 0; # couldn't even create the db
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| 384 | } else { # success creating db
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| 385 | # so let's create the metadata and fulltxt tables for the current coll while we're at it
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| 386 | if($self->create_meta_table()) {
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| 387 | return $self->create_fulltxt_table();
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| 388 | }
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| 389 | }
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| 390 | }
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| 391 | else { # unknown error trying to load db, bail
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| 392 | return 0;
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| 393 | }
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| 394 | }
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| 395 |
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| 396 |
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| 397 | sub create_meta_table {
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| 398 | my $self = shift (@_);
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| 399 | my $table_name = $self->{'collection_name'} . "metadata";
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| 400 | #my $cmd = "CREATE TABLE $table_name (id VARCHAR(255) NOT NULL UNIQUE, did VARCHAR(63) NOT NULL, sid VARCHAR(63) NOT NULL, metaname VARCHAR(127) NOT NULL, metavalue VARCHAR(1023) NOT NULL, PRIMARY KEY(id));";
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| 401 |
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| 402 | # If using an auto incremented primary key:
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| 403 | my $cmd = "CREATE TABLE $table_name (id INT NOT NULL AUTO_INCREMENT, did VARCHAR(63) NOT NULL, sid VARCHAR(63) NOT NULL, metaname VARCHAR(127) NOT NULL, metavalue VARCHAR(1023) NOT NULL, PRIMARY KEY(id));";
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| 404 |
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| 405 | $self->run_command($cmd);
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| 406 |
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| 407 | if(!$self->response_lines_contain("Query OK")) {
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| 408 | print STDERR "Could not create metadata table\n";
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| 409 | return 0;
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| 410 | } else {
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| 411 | return 1;
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| 412 | }
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| 413 | }
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| 414 |
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| 415 | sub create_fulltxt_table {
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| 416 | my $self = shift (@_);
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| 417 | my $table_name = $self->{'collection_name'} . "fulltxt";
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| 418 | #my $cmd = "CREATE TABLE $table_name (id VARCHAR(255) NOT NULL UNIQUE, did VARCHAR(63) NOT NULL, sid VARCHAR(63) NOT NULL, fulltxt LONGTEXT, PRIMARY KEY(id));";
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| 419 |
|
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| 420 | # If using an auto incremented primary key:
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| 421 | my $cmd = "CREATE TABLE $table_name (id INT NOT NULL AUTO_INCREMENT, did VARCHAR(63) NOT NULL, sid VARCHAR(63) NOT NULL, fulltxt LONGTEXT, PRIMARY KEY(id));";
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| 422 |
|
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| 423 | $self->run_command($cmd);
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| 424 |
|
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| 425 | if(!$self->response_lines_contain("Query OK")) {
|
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| 426 | print STDERR "Could not create table\n";
|
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| 427 | return 0;
|
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| 428 | } else {
|
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| 429 | return 1;
|
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| 430 | }
|
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| 431 | }
|
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| 432 |
|
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| 433 | # https://www.guru99.com/insert-into.html
|
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| 434 | # and https://dev.mysql.com/doc/refman/8.0/en/example-auto-increment.html
|
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| 435 | # for inserting multiple rows at once
|
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| 436 | sub get_cmd_insert_new_row_into_meta_table {
|
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| 437 | my $self = shift (@_);
|
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| 438 | my ($did, $sid, $metaname, $metavalue) = @_;
|
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| 439 | my $tablename = $self->{'colname'}_"metadata";
|
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| 440 |
|
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| 441 | my $cmd = "INSERT INTO $tablename (did, sid, metaname, metavalue) VALUES\n";
|
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| 442 | $cmd = "('$did', '$sid', '$metaname', '$metavalue');\n";
|
---|
| 443 | return $cmd;
|
---|
| 444 | }
|
---|
| 445 |
|
---|
| 446 | sub get_cmd_insert_new_row_into_txt_table {
|
---|
| 447 | my $self = shift (@_);
|
---|
| 448 | my ($did, $sid, $fulltext) = @_;
|
---|
| 449 | my $tablename = $self->{'colname'}_"fulltxt";
|
---|
| 450 |
|
---|
| 451 | my $cmd = "INSERT INTO $tablename (did, sid, fulltxt) VALUES\n";
|
---|
| 452 | $cmd = "('$did', '$sid', '$fulltext');\n";
|
---|
| 453 | return $cmd;
|
---|
| 454 | }
|
---|
| 455 |
|
---|
| 456 | # TODO: later add edit and delete (and nothing for "been indexed" status?)
|
---|
| 457 |
|
---|
| 458 | ##################
|
---|
| 459 |
|
---|
| 460 | ## UNUSED
|
---|
| 461 | sub X_open_connection()
|
---|
| 462 | {
|
---|
| 463 | # connect with pwd
|
---|
| 464 | my $conn_success = $self->send_pwd();
|
---|
| 465 | if(!$conn_success) {
|
---|
| 466 | return -1; # if pwd failed, then the program already exists by itself (so don't send quit command after process terminated)
|
---|
| 467 | }
|
---|
| 468 |
|
---|
| 469 | if($conn_success) {
|
---|
| 470 | return $self->load_db();
|
---|
| 471 | } else {
|
---|
| 472 | return $conn_sucess;
|
---|
| 473 | }
|
---|
| 474 | }
|
---|
| 475 |
|
---|
| 476 | #################
|
---|
| 477 |
|
---|
| 478 | 1;
|
---|