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 |
|
---|
441 | my $cmd = "INSERT INTO $tablename (did, sid, metaname, metavalue) VALUES\n";
|
---|
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;
|
---|