1 | ###########################################################################
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2 | #
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3 | # GreenstoneSQLPlugin.pm -- reads into doc_obj from SQL db and docsql.xml
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4 | # Metadata and/or fulltext are stored in SQL db, the rest may be stored in
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5 | # the docsql .xml files.
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6 | # A component of the Greenstone digital library software
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7 | # from the New Zealand Digital Library Project at the
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8 | # University of Waikato, New Zealand.
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9 | #
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10 | # Copyright (C) 2001 New Zealand Digital Library Project
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11 | #
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12 | # This program is free software; you can redistribute it and/or modify
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13 | # it under the terms of the GNU General Public License as published by
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14 | # the Free Software Foundation; either version 2 of the License, or
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15 | # (at your option) any later version.
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16 | #
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17 | # This program is distributed in the hope that it will be useful,
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18 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 | # GNU General Public License for more details.
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21 | #
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22 | # You should have received a copy of the GNU General Public License
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23 | # along with this program; if not, write to the Free Software
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24 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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25 | #
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26 | ###########################################################################
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27 |
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28 | package GreenstoneSQLPlugin;
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29 |
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30 |
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31 | use strict;
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32 | no strict 'refs'; # allow filehandles to be variables and viceversa
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33 |
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34 | use DBI;
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35 | use docprint; # for new unescape_text() subroutine
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36 | use GreenstoneXMLPlugin;
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37 | use gsmysql;
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38 |
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39 | #use unicode;
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40 | #use Encode;
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41 |
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42 | ########################################################################################
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43 |
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44 | # GreenstoneSQLPlugin inherits from GreenstoneXMLPlugin so that if meta or fulltext
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45 | # is still written out to doc.xml (docsql .xml), that will be processed as usual,
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46 | # whereas GreenstoneSQLPlugin will process all the rest (full text and/or meta, whichever
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47 | # is written out by GreenstoneSQLPlugout into the SQL db).
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48 |
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49 |
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50 | sub BEGIN {
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51 | @GreenstoneSQLPlugin::ISA = ('GreenstoneXMLPlugin');
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52 | }
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53 |
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54 | # This plugin must be in the document plugins pipeline IN PLACE OF GreenstoneXMLPlugin
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55 | # So we won't have a process exp conflict here.
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56 | # The structure of docsql.xml files is identical to doc.xml and the contents are similar except:
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57 | # - since metadata and/or fulltxt are stored in mysql db instead, just XML comments indicating
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58 | # this are left inside docsql.xml within the <Description> (for meta) and/or <Content> (for txt)
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59 | # - the root element Archive now has a docoid attribute: <Archive docoid="OID">
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60 | sub get_default_process_exp {
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61 | my $self = shift (@_);
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62 |
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63 | return q^(?i)docsql(-\d+)?\.xml$^; # regex based on this method in GreenstoneXMLPlugin
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64 | }
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65 |
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66 | my $process_mode_list =
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67 | [ { 'name' => "meta_only",
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68 | 'desc' => "{GreenstoneSQLPlug.process_mode.meta_only}" },
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69 | { 'name' => "text_only",
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70 | 'desc' => "{GreenstoneSQLPlug.process_mode.text_only}" },
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71 | { 'name' => "all",
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72 | 'desc' => "{GreenstoneSQLPlug.process_mode.all}" } ];
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73 |
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74 | my $rollback_on_cancel_list =
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75 | [ { 'name' => "true",
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76 | 'desc' => "{common.true}" },
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77 | { 'name' => "false",
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78 | 'desc' => "{common.false}" } ];
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79 |
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80 | # NOTE: If subclassing gsmysql for other supporting databases and if they have different required
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81 | # connection parameters, we can check how WordPlugin, upon detecting Word is installed,
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82 | # dynamically loads Word specific configuration options.
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83 | my $arguments =
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84 | [ { 'name' => "process_exp",
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85 | 'desc' => "{BaseImporter.process_exp}",
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86 | 'type' => "regexp",
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87 | 'deft' => &get_default_process_exp(),
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88 | 'reqd' => "no" },
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89 | { 'name' => "process_mode",
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90 | 'desc' => "{GreenstoneSQLPlug.process_mode}",
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91 | 'type' => "enum",
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92 | 'list' => $process_mode_list,
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93 | 'deft' => "all",
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94 | 'reqd' => "no"},
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95 | { 'name' => "rollback_on_cancel",
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96 | 'desc' => "{GreenstoneSQLPlug.rollback_on_cancel}",
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97 | 'type' => "enum",
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98 | 'list' => $rollback_on_cancel_list,
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99 | 'deft' => "false", # better default than true
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100 | 'reqd' => "no",
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101 | 'hiddengli' => "no"},
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102 | { 'name' => "db_driver",
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103 | 'desc' => "{GreenstoneSQLPlug.db_driver}",
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104 | 'type' => "string",
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105 | 'deft' => "mysql",
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106 | 'reqd' => "yes"},
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107 | { 'name' => "db_client_user",
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108 | 'desc' => "{GreenstoneSQLPlug.db_client_user}",
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109 | 'type' => "string",
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110 | 'deft' => "root",
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111 | 'reqd' => "yes"},
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112 | { 'name' => "db_client_pwd",
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113 | 'desc' => "{GreenstoneSQLPlug.db_client_pwd}",
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114 | 'type' => "string",
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115 | 'deft' => "",
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116 | 'reqd' => "no"}, # pwd not required: can create mysql accounts without pwd
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117 | { 'name' => "db_host",
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118 | 'desc' => "{GreenstoneSQLPlug.db_host}",
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119 | 'type' => "string",
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120 | 'deft' => "127.0.0.1", # NOTE: make this int? No default for port, since it's not a required connection param
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121 | 'reqd' => "yes"},
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122 | { 'name' => "db_port",
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123 | 'desc' => "{GreenstoneSQLPlug.db_port}",
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124 | 'type' => "string", # NOTE: make this int? No default for port, since it's not a required connection param
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125 | 'reqd' => "no"}
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126 | ];
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127 |
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128 | my $options = { 'name' => "GreenstoneSQLPlugin",
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129 | 'desc' => "{GreenstoneSQLPlugin.desc}",
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130 | 'abstract' => "no",
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131 | 'inherits' => "yes",
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132 | 'args' => $arguments };
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133 |
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134 |
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135 | ###### Methods called during buildcol and import #######
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136 |
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137 | sub new {
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138 | my ($class) = shift (@_);
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139 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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140 | push(@$pluginlist, $class);
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141 |
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142 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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143 | push(@{$hashArgOptLists->{"OptList"}},$options);
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144 |
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145 | my $self = new GreenstoneXMLPlugin($pluginlist, $inputargs, $hashArgOptLists);
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146 |
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147 |
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148 | #return bless $self, $class;
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149 | $self = bless $self, $class;
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150 | if ($self->{'info_only'}) {
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151 | # If running pluginfo, we don't need to go further.
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152 | return $self;
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153 | }
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154 |
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155 | # do anything else that needs to be done here when not pluginfo
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156 |
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157 | return $self;
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158 | }
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159 |
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160 | # Call init() not begin() because there can be multiple plugin passes and begin() called for
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161 | # each pass (one for doc level and another for section level indexing), whereas init() should
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162 | # be called before any and all passes.
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163 | # This way, we can connect to the SQL database once per buildcol run.
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164 | # Although now it doesn't matter, since gsmysql.pm uses the get_instance pattern to return a
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165 | # singleton db connection, regardless of the number of gsmysql objects instantiated and
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166 | # the number of connect() calls made on them.
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167 | sub init {
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168 | my ($self) = shift (@_);
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169 |
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170 | $self->SUPER::init(@_); # super (GreenstoneXMLPlugin) will not yet be trying to read from doc.xml (docsql .xml) files in init().
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171 |
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172 |
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173 | # create gsmysql object.
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174 | # collection name will be used for naming tables (site name will be used for naming database)
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175 | my $gs_sql = new gsmysql({
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176 | 'collection_name' => $ENV{'GSDLCOLLECTION'},
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177 | 'verbosity' => $self->{'verbosity'} || 0
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178 | });
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179 |
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180 | # if autocommit is set, there's no rollback support
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181 | my $autocommit = ($self->{'rollback_on_cancel'} eq "false") ? 1 : 0;
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182 |
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183 | # try connecting to the mysql db, die if that fails
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184 | if(!$gs_sql->connect_to_db({
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185 | 'db_driver' => $self->{'db_driver'},
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186 | 'db_client_user' => $self->{'db_client_user'},
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187 | 'db_client_pwd' => $self->{'db_client_pwd'},
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188 | 'db_host' => $self->{'db_host'},
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189 | 'db_port' => $self->{'db_port'}, # undef by default, can leave as is
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190 | 'autocommit' => $autocommit
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191 | })
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192 | )
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193 | {
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194 | # This is fatal for the plugout, let's terminate here
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195 | # PrintError would already have displayed the warning message on connection fail
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196 | die("Could not connect to db. Can't proceed.\n");
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197 | }
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198 |
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199 | my $db_name = $self->{'site'} || "greenstone2"; # one database per GS3 site, for GS2 the db is called greenstone2
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200 |
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201 | # Attempt to use the db, create it if it doesn't exist (but don't create the tables yet)
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202 | # Bail if we can't use the database
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203 | if(!$gs_sql->use_db($db_name)) {
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204 |
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205 | # This is fatal for the plugout, let's terminate here after disconnecting again
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206 | # PrintError would already have displayed the warning message on load fail
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207 | # And on die() perl will call gsmysql destroy which will ensure a disconnect() from db
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208 | die("Could not use db $db_name. Can't proceed.\n");
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209 | }
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210 |
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211 |
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212 | # store db handle now that we're connected
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213 | $self->{'gs_sql'} = $gs_sql;
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214 | }
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215 |
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216 |
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217 | # This method also runs on import.pl if gs_sql has a value.
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218 | # Call deinit() not end() because there can be multiple plugin passes:
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219 | # one for doc level and another for section level indexing
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220 | # and deinit() should be called before all passes
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221 | # This way, we can close the SQL database once per buildcol run.
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222 | # Again, this doesn't matter because we gsmysql the ensures the connection
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223 | # is a singleton connection instance, which connects once and disconnects once per perl process.
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224 | sub deinit {
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225 | my ($self) = shift (@_);
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226 |
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227 | if($self->{'gs_sql'}) {
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228 |
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229 | # Important to call finished():
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230 | # it will disconnect from db if this is the last gsmysql instance,
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231 | # and it will commit to db before disconnecting if rollbback_on_cancel turned on
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232 | $self->{'gs_sql'}->finished();
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233 |
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234 | # Clear gs_sql (setting key to undef has a different meaning from deleting:
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235 | # undef makes key still exist but its value is unded whereas delete deletes the key)
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236 | # So all future use has to make the connection again
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237 | delete $self->{'gs_sql'};
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238 | }
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239 |
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240 | $self->SUPER::deinit(@_);
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241 | }
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242 |
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243 |
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244 |
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245 | ###### Methods only called during import.pl #####
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246 |
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247 | # This is called once if removeold is set with import.pl. Most plugins will do
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248 | # nothing but if a plugin does any stuff outside of creating doc obj, then
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249 | # it may need to clear something.
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250 | # In the case of GreenstoneSQL plugs: this is the first time we have a chance
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251 | # to purge the tables of the current collection from the current site's database
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252 | sub remove_all {
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253 | my $self = shift (@_);
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254 | my ($pluginfo, $base_dir, $processor, $maxdocs) = @_;
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255 |
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256 | $self->SUPER::remove_all(@_);
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257 |
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258 | print STDERR " Building with removeold option set, so deleting current collection's tables if they exist\n" if($self->{'verbosity'});
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259 |
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260 | # if we're in here, we'd already have run 'use database <site>;' during sub init()
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261 | # so we can go ahead and delete the collection's tables
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262 | my $gs_sql = $self->{'gs_sql'};
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263 | $gs_sql->delete_collection_tables(); # will delete them if they exist
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264 |
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265 | # and recreate tables? No. Tables' existence is ensured in GreenstoneSQLPlugout::begin()
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266 | my $proc_mode = $self->{'process_mode'};
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267 | if($proc_mode ne "text_only") {
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268 | $gs_sql->ensure_meta_table_exists();
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269 | }
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270 | if($proc_mode ne "meta_only") {
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271 | $gs_sql->ensure_fulltxt_table_exists();
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272 | }
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273 |
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274 | }
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275 |
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276 | # This is called during import.pl per document for docs that have been deleted from the
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277 | # collection. Most plugins will do nothing
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278 | # but if a plugin does any stuff outside of creating doc obj, then it may need
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279 | # to clear something.
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280 | # In the case of GreenstoneSQL plugs: Remove the doc(s) denoted by oids from GS SQL db.
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281 | # This takes care of incremental deletes (docs marked D by ArchivesInfPlugin when building
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282 | # incrementally) as well as cases of "Non-icremental Delete", see ArchivesInfPlugin.pm.
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283 | # As well as cases involving reindexing, which are implemented here as delete followed by add.
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284 | sub remove_one {
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285 | my $self = shift (@_);
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286 |
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287 | my ($file, $oids, $archivedir) = @_;
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288 |
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289 | my $rv = $self->SUPER::remove_one(@_);
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290 |
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291 | print STDERR "@@@ IN SQLPLUG::REMOVE_ONE: $file\n";
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292 |
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293 | #return undef unless $self->can_process_this_file($file); # NO, DON'T DO THIS (inherited remove_one behaviour) HERE:
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294 | # WE DON'T CARE IF IT'S AN IMAGE FILE THAT WAS DELETED.
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295 | # WE CARE ABOUT REMOVING THE DOC_OID OF THAT IMAGE FILE FROM THE SQL DB
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296 | # SO DON'T RETURN IF CAN'T_PROCESS_THIS_FILE
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297 |
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298 |
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299 | my $gs_sql = $self->{'gs_sql'} || return 0; # couldn't make the connection or no db etc
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300 |
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301 | my $proc_mode = $self->{'process_mode'};
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302 | foreach my $oid (@$oids) {
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303 | if($proc_mode eq "all" || $proc_mode eq "meta_only") {
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304 | print STDERR "@@@@@@@@ Deleting $oid from meta table\n" if $self->{'verbosity'} > 2;
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305 | $gs_sql->delete_recs_from_metatable_with_docid($oid);
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306 | }
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307 | if($proc_mode eq "all" || $proc_mode eq "text_only") {
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308 | print STDERR "@@@@@@@@ Deleting $oid from fulltxt table\n" if $self->{'verbosity'} > 2;
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309 | $gs_sql->delete_recs_from_texttable_with_docid($oid);
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310 | }
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311 | }
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312 | return $rv;
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313 | }
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314 |
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315 | ##### Methods called only during buildcol #####
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316 |
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317 | sub xml_start_tag {
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318 | my $self = shift(@_);
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319 | my ($expat, $element) = @_;
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320 |
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321 | my $outhandle = $self->{'outhandle'};
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322 |
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323 | $self->{'element'} = $element;
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324 | if ($element eq "Archive") { # docsql.xml files contain a OID attribute on Archive element
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325 | # the element's attributes are in %_ as per ReadXMLFile::xml_start_tag() (while $_
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326 | # contains the tag)
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327 |
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328 | # Don't access %_{'docoid'} directly: keep getting a warning message to
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329 | # use $_{'docoid'} for scalar contexts, but %_ is the element's attr hashmap
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330 | # whereas $_ has the tag info. So we don't want to do $_{'docoid'}.
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331 | my %attr_hash = %_; # right way, see OAIPlugin.pm
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332 | $self->{'doc_oid'} = $attr_hash{'docoid'};
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333 | print $outhandle "Extracted OID from docsql.xml: ".$self->{'doc_oid'}."\n"
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334 | if $self->{'verbosity'} > 2;
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335 |
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336 | }
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337 | else { # let superclass GreenstoneXMLPlugin continue to process <Section> and <Metadata> elements
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338 | $self->SUPER::xml_start_tag(@_);
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339 | }
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340 | }
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341 |
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342 | # There are multiple passes processing the document (see buildcol's mode parameter description):
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343 | # - compressing the text which may be a dummy pass for lucene/solr, wherein they still want the
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344 | # docobj for different purposes,
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345 | # - the pass(es) for indexing, e.g. doc/didx and section/sidx level passes
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346 | # - and an infodb pass for processing the classifiers. This pass too needs the docobj
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347 | # Since all passes need the doc_obj, all are read in from docsql + SQL db into the docobj in memory
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348 |
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349 | # We only ever get here or do any parsing of the docsql.xml file during the buildcol.pl phase.
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350 | # At the end of superclass GreenstoneXMLPlugin.pm's close_document() method,
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351 | # the doc_obj in memory is processed (indexed) and then made undef.
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352 | # So we have to work with doc_obj before superclass close_document() is finished.
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353 | sub close_document {
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354 | my $self = shift(@_);
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355 |
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356 | my $gs_sql = $self->{'gs_sql'};
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357 |
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358 | my $outhandle = $self->{'outhandle'};
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359 | my $doc_obj = $self->{'doc_obj'};
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360 |
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361 | my $oid = $self->{'doc_oid'}; # we stored current doc's OID during sub xml_start_tag()
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362 | my $proc_mode = $self->{'process_mode'};
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363 |
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364 | # For now, we have access to doc_obj (until just before super::close_document() terminates)
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365 |
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366 | # OID parsed of docsql.xml file does need to be set on $doc_obj, as noticed in this case:
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367 | # when a doc in import is renamed, and you do incremental import, it is marked for reindexing
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368 | # (reindexing is implemented by this plugin as a delete followed by add into the sql db).
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369 | # In that case, UNLESS you set the OID at this stage, the old deleted doc id (for the old doc
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370 | # name) continues to exist in the index at the end of incremental rebuilding if you were to
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371 | # browse the rebuilt collection by files/titles. So unless you set the OID here, the deleted
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372 | # doc oids will still be listed in the index.
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373 |
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374 | print STDERR " GreenstoneSQLPlugin processing doc $oid (reading into docobj from SQL db)\n"
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375 | if $self->{'verbosity'};
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376 |
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377 | my $build_proc_mode = $self->{'processor'}->get_mode(); # can be "text" as per basebuildproc or infodb
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378 | if($build_proc_mode =~ m/(delete)$/) {
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379 | # build_proc_mode could be "(infodb|text)(delete|reindex)"
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380 | # "...delete" or "...reindex" as per ArchivesInfPlugin
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381 | # But reindex is implemented as delete for GreenstoneSQLPlugs, so that's all we see here?
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382 | print STDERR " DOC $oid WAS MARKED FOR DELETION. Won't attempt to retrieve from SQL db.\n" if $self->{'verbosity'};
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383 | $self->{'doc_obj'}->set_OID($oid); # oid is all we care about for a doc marked for deletion
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384 | $self->SUPER::close_document(@_); # at the end of this method, doc will have been deleted
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385 | return; # oid of doc marked for deletion is not in the SQL db, don't bother looking it up
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386 | }
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387 |
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388 | # else, doc denoted by oid was not marked for deletion, look up its oid in db and read it into doc obj
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389 |
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390 | if($proc_mode eq "all" || $proc_mode eq "meta_only") {
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391 | # read in meta for the collection (i.e. select * from <col>_metadata table
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392 |
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393 | my $records = $gs_sql->select_from_metatable_matching_docid($oid, $outhandle);
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394 |
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395 | print $outhandle "----------SQL DB contains meta-----------\n" if $self->{'verbosity'} > 2;
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396 |
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397 | foreach my $row (@$records) {
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398 | my ($primary_key, $did, $sid, $metaname, $metaval) = @$row;
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399 |
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400 | # get rid of the artificial "root" introduced in section id when saving to sql db
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401 | $sid =~ s@^root@@;
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402 | $sid = $doc_obj->get_top_section() unless $sid;
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403 | print $outhandle "### did: $did, sid: |$sid|, meta: $metaname, val: $metaval\n"
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404 | if $self->{'verbosity'} > 2;
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405 |
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406 | # We're only dealing with utf8 data where docobj is concerned
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407 | # Data stored unescaped in db: escaping only for html/xml files, not for txt files or db
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408 | $doc_obj->add_utf8_metadata($sid, $metaname, $metaval);
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409 | }
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410 |
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411 | # UTF8 debugging, e.g. if we have a with macron in dc.Title
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412 | ##binmode(STDERR, ":utf8"); # not necessary when calling utf8decomp to print wide characters as unicode codept, avoiding 'wide character' warnings.
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413 | #my $dcTitle = $doc_obj->get_metadata_element($doc_obj->get_top_section(), "dc.Title");
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414 | #print STDERR "###### dc.Title: ".&unicode::utf8decomp($dcTitle)."\n";
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415 | #print STDERR "###### DECODED dc.Title: ".&unicode::utf8decomp(&Encode::decode_utf8($dcTitle))."\n"; # decoding was needed for perl 5.18
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416 |
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417 | print $outhandle "----------FIN READING DOC's META FROM SQL DB------------\n"
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418 | if $self->{'verbosity'} > 2;
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419 | }
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420 |
|
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421 | if($proc_mode eq "all" || $proc_mode eq "text_only") {
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422 | # read in fulltxt for the collection (i.e. select * from <col>_fulltxt table
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423 |
|
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424 | my $fulltxt_table = $gs_sql->get_fulltext_table_name();
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425 |
|
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426 |
|
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427 | my $records = $gs_sql->select_from_texttable_matching_docid($oid, $outhandle);
|
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428 |
|
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429 |
|
---|
430 | print $outhandle "----------\nSQL DB contains txt entries for-----------\n"
|
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431 | if $self->{'verbosity'} > 2;
|
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432 |
|
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433 | foreach my $row (@$records) {
|
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434 | my ($primary_key, $did, $sid, $text) = @$row;
|
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435 |
|
---|
436 | # get rid of the artificial "root" introduced in section id when saving to sql db
|
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437 | #$sid =~ s@^root@@;
|
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438 | $sid = $doc_obj->get_top_section() if ($sid eq "root");
|
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439 | print $outhandle "### did: $did, sid: |$sid|, fulltext: <TXT>\n"
|
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440 | if $self->{'verbosity'} > 2;
|
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441 |
|
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442 | # We're only dealing with utf8 data where docobj is concerned
|
---|
443 | # Data stored unescaped in db: escaping is only for html/xml files, not for txt files or db
|
---|
444 | $doc_obj->add_utf8_textref($sid, \$text);
|
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445 | }
|
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446 | print $outhandle "----------FIN READING DOC's TXT FROM SQL DB------------\n"
|
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447 | if $self->{'verbosity'} > 2;
|
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448 | }
|
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449 |
|
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450 |
|
---|
451 | # setting OID here instead of before reading from SQL db into docobj, will prevent duplicate values for Identifier
|
---|
452 | # since doc::set_OID() calls doc::set_metadata_element() for metadata that can't occur more than once
|
---|
453 | $self->{'doc_obj'}->set_OID($oid); # may only be necessary if doc was marked for deletion so that SUPER::close_document knows
|
---|
454 | # the oid of marked doc to remove from index
|
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455 |
|
---|
456 | # done reading into docobj from SQL db
|
---|
457 |
|
---|
458 | # don't forget to clean up on close() in superclass
|
---|
459 | # It will get the doc_obj indexed then make it undef
|
---|
460 | $self->SUPER::close_document(@_);
|
---|
461 | }
|
---|
462 |
|
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463 |
|
---|
464 | 1;
|
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