| 1 | ###############################################################################
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| 2 | #
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| 3 | # HDFSShell.pm -- file functions acting upon a HDFS via the CLI hadoop
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| 4 | # application
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| 5 | #
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| 6 | # A component of the Greenstone digital library software from the New Zealand
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| 7 | # Digital Library Project at the University of Waikato, New Zealand.
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| 8 | #
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| 9 | # Copyright (C) 2013 New Zealand Digital Library Project
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| 10 | #
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| 11 | # This program is free software; you can redistribute it and/or modify it under
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| 12 | # the terms of the GNU General Public License as published by the Free Software
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| 13 | # Foundation; either version 2 of the License, or (at your option) any later
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| 14 | # version.
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| 15 | #
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| 16 | # This program is distributed in the hope that it will be useful, but WITHOUT
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| 17 | # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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| 18 | # FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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| 19 | # details.
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| 20 | #
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| 21 | # You should have received a copy of the GNU General Public License along with
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| 22 | # this program; if not, write to the Free Software Foundation, Inc., 675 Mass
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| 23 | # Ave, Cambridge, MA 02139, USA.
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| 24 | #
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| 25 | ###############################################################################
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| 26 |
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| 27 | package FileUtils::HDFSShell;
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| 28 |
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| 29 | # Pragma
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| 30 | use strict;
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| 31 |
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| 32 | # Modules
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| 33 | use DateTime;
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| 34 |
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| 35 | # Configuration
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| 36 | my $debug = 0;
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| 37 |
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| 38 | ################################################################################
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| 39 | ######################### Private Functions & Variables ########################
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| 40 | ################################################################################
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| 41 |
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| 42 | ## @function _executeHDFSCommand()
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| 43 | #
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| 44 | # Executes a HDFS command without caring about the resulting output
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| 45 | # while still reacting appropriately to failed executions.
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| 46 | #
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| 47 | sub _executeHDFSCommand
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| 48 | {
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| 49 | my $return_result = shift(@_);
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| 50 | if ($return_result != 0 && $return_result != 1)
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| 51 | {
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| 52 | &FileUtils::printError('Unexpected value for return_result argument - should be 0 or 1: ' . $return_result, 1);
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| 53 | }
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| 54 | my $command = &_generateHDFSCommand(@_);
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| 55 | my $result = `$command 2>&1`;
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| 56 | my $return_value = $?;
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| 57 | &_printDebug(' -> util::executeHDFSCommand() => |' . $result . '| [' . $return_value . ']');
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| 58 | # sometimes we may want the actual resulting output returned, for
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| 59 | # instance when parsing ls
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| 60 | if ($return_result)
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| 61 | {
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| 62 | $return_value = $result;
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| 63 | }
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| 64 | return $return_value;
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| 65 | }
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| 66 | ## _executeHDFSCommand()
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| 67 |
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| 68 |
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| 69 | ## @function _generateHDFSCommand()
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| 70 | #
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| 71 | sub _generateHDFSCommand
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| 72 | {
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| 73 | my $action = shift(@_);
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| 74 | my @args = @_;
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| 75 | my $arguments = '';
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| 76 | foreach my $path (@args)
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| 77 | {
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| 78 | # Replace the prefix with one HDFS Shell understands
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| 79 | $path =~ s/HDFSShell:/hdfs:/;
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| 80 | # special case for standard streams
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| 81 | if ($path eq '-')
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| 82 | {
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| 83 | $arguments .= '- ';
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| 84 | }
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| 85 | else
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| 86 | {
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| 87 | $arguments .= '"' . $path . '" ';
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| 88 | }
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| 89 | }
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| 90 | my $command = 'hadoop fs -' . $action . ' ' . $arguments;
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| 91 | &_printDebug(' -> _generateHDFSCommand("' . $action . '", ...) => |' . $command . '|');
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| 92 | return $command;
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| 93 | }
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| 94 | ## _generateHDFSCommand()
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| 95 |
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| 96 |
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| 97 | ## @function _printDebug()
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| 98 | #
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| 99 | sub _printDebug
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| 100 | {
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| 101 | my ($message) = @_;
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| 102 | if ($debug)
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| 103 | {
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| 104 | print STDERR '[DEBUG] ' . $message . "\n";
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| 105 | }
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| 106 | }
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| 107 | ## _printDebug()
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| 108 |
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| 109 |
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| 110 | ################################################################################
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| 111 | ############################### Public Functions ###############################
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| 112 | ################################################################################
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| 113 |
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| 114 |
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| 115 | ## @function closeFileHandle()
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| 116 | #
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| 117 | sub closeFileHandle
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| 118 | {
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| 119 | my $fh_ref = shift(@_);
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| 120 | close($$fh_ref);
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| 121 | return 1;
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| 122 | }
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| 123 | ## closeFileHandle()
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| 124 |
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| 125 |
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| 126 | ## @function fileSize()
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| 127 | #
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| 128 | sub fileSize
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| 129 | {
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| 130 | my ($path) = @_;
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| 131 | my $file_stats = &fileStats($path);
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| 132 | return $file_stats->{'filesize'};
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| 133 | }
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| 134 | ## fileSize()
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| 135 |
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| 136 |
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| 137 | ## @function fileStats()
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| 138 | #
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| 139 | sub fileStats
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| 140 | {
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| 141 | my ($path) = @_;
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| 142 | my $stats = {};
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| 143 | my $result = &_executeHDFSCommand(1, 'ls', $path);
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| 144 | # - parse the results
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| 145 | if ($result =~ /([ds\-][rwx\-]+)\s+(\d+)\s+([^\s]+)\s+([^\s]+)\s+(\d+)\s+(\d\d\d\d-\d\d-\d\d)\s+(\d\d:\d\d)\s+([^\s]+)$/)
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| 146 | {
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| 147 | $stats->{'filename'} = $8;
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| 148 | $stats->{'replicas'} = $2;
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| 149 | $stats->{'filesize'} = $5;
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| 150 | $stats->{'modification_date'} = $6;
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| 151 | $stats->{'modification_time'} = $7;
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| 152 | $stats->{'permissions'} = $1;
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| 153 | $stats->{'userid'} = $3;
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| 154 | $stats->{'groupid'} = $4;
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| 155 | }
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| 156 | else
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| 157 | {
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| 158 | &FileUtils::printError('Failed to parse -ls result: ' . $result, 1);
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| 159 | }
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| 160 | return $stats;
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| 161 | }
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| 162 | ## fileStats()
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| 163 |
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| 164 |
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| 165 | ## @function fileTest()
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| 166 | #
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| 167 | sub fileTest
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| 168 | {
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| 169 | my ($filename_full_path, $test_op) = @_;
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| 170 | # Sanity tests
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| 171 | # Special case: HDFS doesn't support symlinking - swap for -e instead
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| 172 | if (!defined $test_op || $test_op eq '-l')
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| 173 | {
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| 174 | $test_op = '-e';
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| 175 | }
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| 176 | my $retval = -1; # cmd return fails > 0 are errors
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| 177 | # Special case: the easiest way to support -f is to run a -e followed by a -d
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| 178 | # (which should fail for files)
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| 179 | if ($test_op eq '-f')
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| 180 | {
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| 181 | my $retval1 = &_executeHDFSCommand(0, 'test -e', $filename_full_path);
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| 182 | if ($retval1 == 0)
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| 183 | {
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| 184 | my $retval2 = &_executeHDFSCommand(0, 'test -d', $filename_full_path);
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| 185 | if ($retval2 > 0)
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| 186 | {
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| 187 | $retval = 0;
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| 188 | }
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| 189 | }
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| 190 | }
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| 191 | # very limited test op support for HDFS
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| 192 | elsif ($test_op ne '-d' && $test_op ne '-e' && $test_op ne '-z')
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| 193 | {
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| 194 | &FileUtils::printError('Unknown or unsupported test mode: ' . $test_op);
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| 195 | }
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| 196 | else
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| 197 | {
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| 198 | $retval = &_executeHDFSCommand(0, 'test ' . $test_op, $filename_full_path);
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| 199 | }
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| 200 | return ($retval == 0 ? 1 : 0);
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| 201 | }
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| 202 | ## fileTest()
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| 203 |
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| 204 |
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| 205 | ## @function filenameConcatenate()
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| 206 | #
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| 207 | sub filenameConcatenate
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| 208 | {
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| 209 | my $protocol = shift(@_);
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| 210 | my $filename = join('/', @_);
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| 211 | # remove repeated slashes
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| 212 | $filename =~ s/[\/]+/\//g;
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| 213 | # append protocol (which may cause multiple slashes)
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| 214 | $filename = $protocol . '/' . $filename;
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| 215 | # strip any trailing slashes
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| 216 | $filename =~ s/[\\\/]$//;
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| 217 | return $filename;
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| 218 | }
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| 219 | ## filenameConcatenate()
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| 220 |
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| 221 |
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| 222 | ## @function makeDirectory()
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| 223 | #
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| 224 | sub makeDirectory
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| 225 | {
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| 226 | my ($dir) = @_;
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| 227 | my $result = &_executeHDFSCommand(0, 'mkdir', $dir);
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| 228 | # HDFSShell mkdir returns 0 on success, -1 on failure
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| 229 | return ($result == 0 ? 1 : 0);
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| 230 | }
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| 231 | ## makeDirectory()
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| 232 |
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| 233 |
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| 234 | ## @function modificationTime()
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| 235 | #
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| 236 | sub modificationTime
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| 237 | {
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| 238 | my ($path) = @_;
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| 239 | my $file_stats = &fileStats($path);
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| 240 | my $mod_date = $file_stats->{'modification_date'};
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| 241 | $mod_date =~ /(\d\d\d\d)-(\d\d)-(\d\d)/;
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| 242 | my $mod_year = $1;
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| 243 | my $mod_month = $2;
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| 244 | my $mod_day = $3;
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| 245 | my $mod_time = $file_stats->{'modification_time'};
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| 246 | $mod_time =~ /(\d\d):(\d\d)/;
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| 247 | my $mod_hour = $1;
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| 248 | my $mod_minute = $2;
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| 249 | my $mod_datetime = DateTime->new(year => $mod_year,
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| 250 | month => $mod_month,
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| 251 | day => $mod_day,
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| 252 | hour => $mod_hour,
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| 253 | minute => $mod_minute,
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| 254 | time_zone => 'local');
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| 255 | return $mod_datetime->epoch();
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| 256 | }
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| 257 | ## modificationTime()
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| 258 |
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| 259 |
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| 260 | ## @function openFileHandle()
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| 261 | #
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| 262 | sub openFileHandle
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| 263 | {
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| 264 | my ($path, $mode, $fh_ref) = @_;
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| 265 | if ($mode eq '>>' || $mode eq 'a')
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| 266 | {
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| 267 | &FileUtils::printError('Append (>>) mode not supported', 1);
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| 268 | }
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| 269 | elsif ($mode eq '>' || $mode eq 'w')
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| 270 | {
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| 271 | # the put command fails if the file already exists
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| 272 | if (&fileTest($path, '-e'))
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| 273 | {
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| 274 | &removeFiles($path);
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| 275 | }
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| 276 | open($$fh_ref, '| ' . &_generateHDFSCommand('put', '-', $path)) or &FileUtils::printError('Failed to open pipe to HDFS (put) for writing: ' . $path, 1);
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| 277 | }
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| 278 | else
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| 279 | {
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| 280 | open($$fh_ref, &_generateHDFSCommand('cat', $path) . ' |') or &FileUtils::printError('Failed to open pipe to HDFS (cat) for reading: ' . $path, 1);
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| 281 | }
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| 282 | return 1;
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| 283 | }
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| 284 | ## openFileHandle()
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| 285 |
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| 286 |
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| 287 | ## @function readDirectory()
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| 288 | #
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| 289 | sub readDirectory
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| 290 | {
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| 291 | my ($path) = @_;
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| 292 | my @files;
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| 293 | my $result = &_executeHDFSCommand(1, 'ls', $path);
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| 294 | my @lines = split(/\r?\n/, $result);
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| 295 | foreach my $line (@lines)
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| 296 | {
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| 297 | if ($line =~ /\/([^\/]+)$/)
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| 298 | {
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| 299 | my $file = $1;
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| 300 | push(@files, $file);
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| 301 | }
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| 302 | }
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| 303 | return \@files;
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| 304 | }
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| 305 | ## readDirectory()
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| 306 |
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| 307 |
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| 308 | ## @function removeFiles()
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| 309 | #
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| 310 | sub removeFiles
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| 311 | {
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| 312 | my ($path, $including_dir) = @_;
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| 313 | my $result;
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| 314 | if (defined $including_dir && $including_dir)
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| 315 | {
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| 316 | $result = &_executeHDFSCommand(0, 'rmr', $path);
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| 317 | }
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| 318 | else
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| 319 | {
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| 320 | $result = &_executeHDFSCommand(0, 'rm', $path);
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| 321 | }
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| 322 | # HDFSShell mkdir returns 0 on success, -1 on failure
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| 323 | return ($result == 0 ? 1 : 0);
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| 324 | }
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| 325 | ## removeFiles()
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| 326 |
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| 327 |
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| 328 | ## @function removeFilesFiltered()
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| 329 | #
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| 330 | sub removeFilesFiltered
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| 331 | {
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| 332 | my ($paths, $accept_re, $reject_re) = @_;
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| 333 | # Perform a depth first, recursive, removal of files and directories that
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| 334 | # match the given accept and reject patterns
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| 335 | my @paths_array = (ref $paths eq "ARRAY") ? @$paths : ($paths);
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| 336 | my $num_removed = 0;
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| 337 | foreach my $path (@paths_array)
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| 338 | {
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| 339 | # remove trailing slashes
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| 340 | $path =~ s/[\/\\]+$//;
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| 341 | if (!&fileTest($path, '-e'))
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| 342 | {
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| 343 | &FileUtils::printError('path does not exist: ' . $path);
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| 344 | }
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| 345 | elsif (&fileTest($path, '-d'))
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| 346 | {
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| 347 | my @files = @{&readDirectory($path)};
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| 348 | foreach my $file (@files)
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| 349 | {
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| 350 | my $child_path = $path . '/' . $file;
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| 351 | $num_removed += &removeFilesFiltered($child_path, $accept_re, $reject_re);
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| 352 | }
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| 353 | if (!defined $accept_re && !defined $reject_re)
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| 354 | {
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| 355 | # remove this directory
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| 356 | my $result = &removeFiles($path, 1);
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| 357 | if ($result != 1)
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| 358 | {
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| 359 | &FileUtils::printError('could not remove directory: ' . $path);
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| 360 | }
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| 361 | else
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| 362 | {
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| 363 | $num_removed++;
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| 364 | }
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| 365 | }
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| 366 | }
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| 367 | else
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| 368 | {
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| 369 | if (defined $reject_re && ($path =~ m/$reject_re/))
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| 370 | {
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| 371 | next;
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| 372 | }
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| 373 | if ((!defined $accept_re) || ($path =~ m/$accept_re/))
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| 374 | {
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| 375 | # remove this file
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| 376 | my $result = &removeFiles($path);
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| 377 | if ($result != 1)
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| 378 | {
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| 379 | &FileUtils::printError('could not remove file: ' . $path);
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| 380 | }
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| 381 | else
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| 382 | {
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| 383 | $num_removed++;
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| 384 | }
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| 385 | }
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| 386 | }
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| 387 | }
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| 388 | return $num_removed;
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| 389 | }
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| 390 | ## removeFilesFiltered()
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| 391 |
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| 392 |
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| 393 | ## @function removeFilesRecursive()
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| 394 | #
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| 395 | sub removeFilesRecursive
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| 396 | {
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| 397 | my ($path) = @_;
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| 398 | # use the more general removeFilesFiltered() function with no accept
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| 399 | # or reject expressions
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| 400 | return &removeFilesFiltered($path, undef, undef);
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| 401 | }
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| 402 | ## removeFilesRecursive()
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| 403 |
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| 404 |
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| 405 | ## @function supportsSymbolicLink
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| 406 | #
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| 407 | sub supportsSymbolicLink
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| 408 | {
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| 409 | return 0;
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| 410 | }
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| 411 | ## supportsSymbolicLink()
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| 412 |
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| 413 |
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| 414 | ## @function transferFile()
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| 415 | #
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| 416 | sub transferFile
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| 417 | {
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| 418 | my ($mode, $src, $dst) = @_;
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| 419 | my $result;
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| 420 | if ($mode eq 'COPY')
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| 421 | {
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| 422 | $result = &_executeHDFSCommand(0, 'cp', $src, $dst);
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| 423 | }
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| 424 | else
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| 425 | {
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| 426 | $result = &_executeHDFSCommand(0, 'mv', $src, $dst);
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| 427 | }
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| 428 | # HDFSShell mkdir returns 0 on success, -1 on failure
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| 429 | return ($result == 0 ? 1 : 0);
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| 430 | }
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| 431 | ## transferFile()
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| 432 |
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| 433 |
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| 434 | ## @function transferFileFromLocal()
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| 435 | #
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| 436 | sub transferFileFromLocal
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| 437 | {
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| 438 | my ($mode, $src, $dst) = @_;
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| 439 | if (!-f $src)
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| 440 | {
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| 441 | &FileUtils::printError('Source file (during ' . $mode . ') doesn\'t exists: ' . $src);
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| 442 | }
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| 443 | if (&fileTest($dst, '-d'))
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| 444 | {
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| 445 | my ($filename) = $src =~ /([^\\\/]+)$/;
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| 446 | $dst .= '/' . $filename;
|
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| 447 | }
|
|---|
| 448 | if (&fileTest($dst, '-f'))
|
|---|
| 449 | {
|
|---|
| 450 | &FileUtils::printError('Destination file (during ' . $mode . ') already exists: ' . $dst);
|
|---|
| 451 | }
|
|---|
| 452 | my $result = &_executeHDFSCommand(0, 'put', $src, $dst);
|
|---|
| 453 | my $remove_result = 1;
|
|---|
| 454 | if ($mode eq 'MOVE')
|
|---|
| 455 | {
|
|---|
| 456 | unlink($src);
|
|---|
| 457 | # failed to delete somehow
|
|---|
| 458 | if (-f $src)
|
|---|
| 459 | {
|
|---|
| 460 | $remove_result = 0;
|
|---|
| 461 | }
|
|---|
| 462 | }
|
|---|
| 463 | return ($result == 0 && $remove_result ? 1 : 0);
|
|---|
| 464 | }
|
|---|
| 465 | ## transferFileFromLocal()
|
|---|
| 466 |
|
|---|
| 467 |
|
|---|
| 468 | ## @function transferFileToLocal()
|
|---|
| 469 | #
|
|---|
| 470 | sub transferFileToLocal
|
|---|
| 471 | {
|
|---|
| 472 | my ($mode, $src, $dst) = @_;
|
|---|
| 473 | if (!&fileTest($src, '-f'))
|
|---|
| 474 | {
|
|---|
| 475 | &FileUtils::printError('Source file (during ' . $mode . ') does not exist: ' . $src);
|
|---|
| 476 | }
|
|---|
| 477 | if (-d $dst)
|
|---|
| 478 | {
|
|---|
| 479 | my ($filename) = $src =~ /([^\\\/]+)$/;
|
|---|
| 480 | $dst .= '/' . $filename;
|
|---|
| 481 | }
|
|---|
| 482 | if (-e $dst)
|
|---|
| 483 | {
|
|---|
| 484 | &FileUtils::printError('Destination file (during ' . $mode . ') already exists: ' . $dst);
|
|---|
| 485 | }
|
|---|
| 486 | my $result = &_executeHDFSCommand(0, 'get', $src, $dst);
|
|---|
| 487 | my $remove_result = 1;
|
|---|
| 488 | if ($mode eq 'MOVE')
|
|---|
| 489 | {
|
|---|
| 490 | $remove_result = &removeFiles($src);
|
|---|
| 491 | }
|
|---|
| 492 | return ($result == 0 && $remove_result ? 1 : 0);
|
|---|
| 493 | }
|
|---|
| 494 | ## transferFileToLocal()
|
|---|
| 495 |
|
|---|
| 496 |
|
|---|
| 497 | 1;
|
|---|
