[30318] | 1 | ###############################################################################
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| 2 | #
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| 3 | # GDBM.pm -- utility functions for writing to gdbm databases
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| 4 | #
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| 5 | # A component of the Greenstone digital library software from the New Zealand
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| 6 | # Digital Library Project at the University of Waikato, New Zealand.
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| 7 | #
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| 8 | # Copyright (C) 1999-2015 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 it under
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| 11 | # the terms of the GNU General Public License as published by the Free Software
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| 12 | # Foundation; either version 2 of the License, or (at your option) any later
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| 13 | # version.
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| 14 | #
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| 15 | # This program is distributed in the hope that it will be useful, but WITHOUT
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| 16 | # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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| 17 | # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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| 18 | # more details.
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| 19 | #
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| 20 | # You should have received a copy of the GNU General Public License along with
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| 21 | # this program; if not, write to the Free Software Foundation, Inc., 675 Mass
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| 22 | # 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 DBDrivers::GDBM;
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| 27 |
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| 28 | # Pragma
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| 29 | use strict;
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| 30 |
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| 31 | # Libraries
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| 32 | use util;
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| 33 | use FileUtils;
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| 34 | use DBDrivers::BaseDBDriver;
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| 35 |
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| 36 | sub BEGIN
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| 37 | {
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| 38 | @DBDrivers::GDBM::ISA = ( 'DBDrivers::BaseDBDriver' );
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| 39 | }
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| 40 |
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| 41 | sub new
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| 42 | {
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| 43 | my $class = shift(@_);
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| 44 | return bless ($self, $class);
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| 45 | }
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| 46 |
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| 47 | # -----------------------------------------------------------------------------
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| 48 | # GDBM IMPLEMENTATION
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| 49 | # -----------------------------------------------------------------------------
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| 50 |
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| 51 |
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| 52 | ## @function open_infodb_write_handle(string, string)
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| 53 | #
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| 54 | sub open_infodb_write_handle
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| 55 | {
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| 56 | my $infodb_file_path = shift(@_);
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| 57 | my $opt_append = shift(@_);
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| 58 |
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| 59 | my $txt2db_exe = &FileUtils::filenameConcatenate($ENV{'GSDLHOME'},"bin",$ENV{'GSDLOS'}, "txt2db" . &util::get_os_exe());
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| 60 | my $infodb_file_handle = undef;
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| 61 | my $cmd = "\"$txt2db_exe\"";
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| 62 | if ((defined $opt_append) && ($opt_append eq "append")) {
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| 63 | $cmd .= " -append";
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| 64 | }
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| 65 | $cmd .= " \"$infodb_file_path\"";
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| 66 |
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| 67 | if (!-e "$txt2db_exe") {
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| 68 | print STDERR "Error: Unable to find $txt2db_exe\n";
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| 69 | return undef;
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| 70 | }
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| 71 |
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| 72 | if(!open($infodb_file_handle, "| $cmd")) {
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| 73 | print STDERR "Error: Failed to open pipe to $cmd\n";
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| 74 | print STDERR " $!\n";
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| 75 | return undef;
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| 76 | }
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| 77 |
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| 78 | binmode($infodb_file_handle,":utf8");
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| 79 |
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| 80 | return $infodb_file_handle;
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| 81 | }
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| 82 | ## open_infodb_write_handle(string, string) => filehandle ##
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| 83 |
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| 84 |
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| 85 | ## @function close_infodb_write_handle(filehandle)
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| 86 | #
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| 87 | sub close_infodb_write_handle
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| 88 | {
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| 89 | my $infodb_handle = shift(@_);
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| 90 | close($infodb_handle);
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| 91 | }
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| 92 | ## close_infodb_write_handle(filehandle) => void ##
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| 93 |
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| 94 |
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| 95 | ## @function get_infodb_file_path()
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| 96 | #
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| 97 | sub get_infodb_file_path
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| 98 | {
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| 99 | my $collection_name = shift(@_);
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| 100 | my $infodb_directory_path = shift(@_);
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| 101 | my $infodb_file_extension = ".gdb";
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| 102 | my $infodb_file_name = &util::get_dirsep_tail($collection_name) . $infodb_file_extension;
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| 103 | return &FileUtils::filenameConcatenate($infodb_directory_path, $infodb_file_name);
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| 104 | }
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| 105 | ## get_infodb_file_path() => string ##
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| 106 |
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| 107 |
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| 108 | ## @function read_infodb_file(string, hashmap)
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| 109 | #
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| 110 | sub read_infodb_file
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| 111 | {
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| 112 | my $infodb_file_path = shift(@_);
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| 113 | my $infodb_map = shift(@_);
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| 114 |
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| 115 | open (PIPEIN, "db2txt \"$infodb_file_path\" |") || die "couldn't open pipe from db2txt \$infodb_file_path\"\n";
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| 116 |
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| 117 | binmode(PIPEIN,":utf8");
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| 118 |
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| 119 | my $infodb_line = "";
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| 120 | my $infodb_key = "";
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| 121 | my $infodb_value = "";
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| 122 | while (defined ($infodb_line = <PIPEIN>)) {
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| 123 | $infodb_line =~ s/(\r\n)+$//; # more general than chomp
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| 124 |
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| 125 | if ($infodb_line =~ /^\[([^\]]+)\]$/) {
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| 126 | $infodb_key = $1;
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| 127 | }
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| 128 | elsif ($infodb_line =~ /^-{70}$/) {
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| 129 | $infodb_map->{$infodb_key} = $infodb_value;
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| 130 | $infodb_key = "";
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| 131 | $infodb_value = "";
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| 132 | }
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| 133 | else {
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| 134 | $infodb_value .= $infodb_line;
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| 135 | }
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| 136 | }
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| 137 | close (PIPEIN);
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| 138 | }
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| 139 | ## read_infodb_file(string, hashmap) => void ##
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| 140 |
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| 141 |
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| 142 | ## @function read_infodb_keys(string, hashmap)
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| 143 | #
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| 144 | sub read_infodb_keys
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| 145 | {
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| 146 | my $infodb_file_path = shift(@_);
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| 147 | my $infodb_map = shift(@_);
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| 148 |
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| 149 | open (PIPEIN, "gdbmkeys \"$infodb_file_path\" |") || die "couldn't open pipe from gdbmkeys \$infodb_file_path\"\n";
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| 150 |
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| 151 | binmode(PIPEIN,":utf8");
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| 152 |
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| 153 | my $infodb_line = "";
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| 154 | my $infodb_key = "";
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| 155 | my $infodb_value = "";
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| 156 | while (defined ($infodb_line = <PIPEIN>)) {
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| 157 | # chomp $infodb_line; # remove end of line
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| 158 | $infodb_line =~ s/(\r\n)+$//; # more general than chomp
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| 159 |
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| 160 | $infodb_map->{$infodb_line} = 1;
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| 161 | }
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| 162 |
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| 163 | close (PIPEIN);
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| 164 | }
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| 165 | ## read_infodb_keys(string, hashmap) => void ##
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| 166 |
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| 167 |
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| 168 | ## @function write_infodb_entry(filehandle, string, hashmap)
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| 169 | #
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| 170 | sub write_infodb_entry
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| 171 | {
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| 172 | my $infodb_handle = shift(@_);
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| 173 | my $infodb_key = shift(@_);
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| 174 | my $infodb_map = shift(@_);
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| 175 |
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| 176 | print $infodb_handle "[$infodb_key]\n";
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| 177 | foreach my $infodb_value_key (sort keys(%$infodb_map)) {
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| 178 | foreach my $infodb_value (@{$infodb_map->{$infodb_value_key}}) {
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| 179 | if ($infodb_value =~ /-{70,}/) {
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| 180 | # if value contains 70 or more hyphens in a row we need to escape them
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| 181 | # to prevent txt2db from treating them as a separator
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| 182 | $infodb_value =~ s/-/&\#045;/gi;
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| 183 | }
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| 184 | print $infodb_handle "<$infodb_value_key>" . $infodb_value . "\n";
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| 185 | }
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| 186 | }
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| 187 | print $infodb_handle '-' x 70, "\n";
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| 188 | }
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| 189 | ## write_infodb_entry(filehandle, string, hashmap) => void ##
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| 190 |
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| 191 |
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| 192 | ## @function write_infodb_rawentry(filehandle, string, string)
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| 193 | #
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| 194 | sub write_infodb_rawentry
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| 195 | {
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| 196 | my $infodb_handle = shift(@_);
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| 197 | my $infodb_key = shift(@_);
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| 198 | my $infodb_val = shift(@_);
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| 199 |
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| 200 | print $infodb_handle "[$infodb_key]\n";
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| 201 | print $infodb_handle "$infodb_val\n";
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| 202 | print $infodb_handle '-' x 70, "\n";
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| 203 | }
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| 204 | ## write_infodb_rawentry(filehandle, string, string) ##
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| 205 |
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| 206 |
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| 207 | ## @function set_infodb_entry(string, string, hashmap)
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| 208 | #
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| 209 | sub set_infodb_entry
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| 210 | {
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| 211 | my $infodb_file_path = shift(@_);
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| 212 | my $infodb_key = shift(@_);
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| 213 | my $infodb_map = shift(@_);
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| 214 |
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| 215 | # HTML escape anything that is not part of the "contains" metadata value
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| 216 | foreach my $k (keys %$infodb_map) {
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| 217 | my @escaped_v = ();
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| 218 | foreach my $v (@{$infodb_map->{$k}}) {
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| 219 | if ($k eq "contains") {
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| 220 | push(@escaped_v, $v);
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| 221 | }
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| 222 | else {
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| 223 | my $ev = &ghtml::unescape_html($v);
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| 224 | push(@escaped_v, $ev);
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| 225 | }
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| 226 | }
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| 227 | $infodb_map->{$k} = \@escaped_v;
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| 228 | }
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| 229 |
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| 230 | # Generate the record string
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| 231 | my $serialized_infodb_map = &dbutil::convert_infodb_hash_to_string($infodb_map);
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| 232 |
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| 233 | # Store it into GDBM using 'txt2db -append' which despite its name
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| 234 | # actually replaces the record if it already exists
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| 235 | my $cmd = "txt2db -append \"$infodb_file_path\"";
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| 236 |
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| 237 | my $status = undef;
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| 238 | if(!open(GOUT, "| $cmd")) {
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| 239 | print STDERR "Error: gdbm::set_infodb_entry() failed to open pipe to: $cmd\n";
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| 240 | print STDERR " $!\n";
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| 241 | $status = -1;
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| 242 | }
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| 243 | else {
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| 244 | binmode(GOUT,":utf8");
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| 245 |
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| 246 | print GOUT "[$infodb_key]\n";
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| 247 | print GOUT "$serialized_infodb_map\n";
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| 248 |
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| 249 | close(GOUT);
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| 250 | $status = 0; # as in exit status of cmd OK
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| 251 | }
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| 252 | return $status;
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| 253 | }
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| 254 | ## set_infodb_entry(string, string, hashmap) => integer ##
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| 255 |
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| 256 |
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| 257 | ## @function delete_infodb_entry(filehandle, string)
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| 258 | #
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| 259 | sub delete_infodb_entry
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| 260 | {
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| 261 | my $infodb_handle = shift(@_);
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| 262 | my $infodb_key = shift(@_);
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| 263 |
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| 264 | # A minus at the end of a key (after the ]) signifies 'delete'
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| 265 | print $infodb_handle "[$infodb_key]-\n";
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| 266 |
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| 267 | # The 70 minus signs are also needed, to help make the parsing by db2txt simple
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| 268 | print $infodb_handle '-' x 70, "\n";
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| 269 | }
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| 270 | ## delete_infodb_entry(filehandle, string) => void ##
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| 271 |
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| 272 | 1;
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