| 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 | # Configuration
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| 33 | my $debug = 0;
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| 34 |
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| 35 | ################################################################################
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| 36 | ######################### Private Functions & Variables ########################
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| 37 | ################################################################################
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| 38 |
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| 39 | ## @function _executeHDFSCommand()
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| 40 | #
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| 41 | # Executes a HDFS command without caring about the resulting output
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| 42 | # while still reacting appropriately to failed executions.
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| 43 | #
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| 44 | sub _executeHDFSCommand
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| 45 | {
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| 46 | my $return_result = shift(@_);
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| 47 | if ($return_result != 0 && $return_result != 1)
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| 48 | {
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| 49 | &FileUtils::printError('Unexpected value for return_result argument - should be 0 or 1: ' . $return_result, 1);
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| 50 | }
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| 51 | my $command = &_generateHDFSCommand(@_);
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| 52 | my $result = `$command 2>&1`;
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| 53 | my $return_value = $?;
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| 54 | &_printDebug(' -> util::executeHDFSCommand() => |' . $result . '| [' . $return_value . ']');
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| 55 | # sometimes we may want the actual resulting output returned, for
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| 56 | # instance when parsing ls
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| 57 | if ($return_result)
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| 58 | {
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| 59 | $return_value = $result;
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| 60 | }
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| 61 | return $return_value;
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| 62 | }
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| 63 | ## _executeHDFSCommand()
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| 64 |
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| 65 |
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| 66 | ## @function _generateHDFSCommand()
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| 67 | #
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| 68 | sub _generateHDFSCommand
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| 69 | {
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| 70 | my $action = shift(@_);
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| 71 | my @args = @_;
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| 72 | my $arguments = '';
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| 73 | foreach my $path (@args)
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| 74 | {
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| 75 | # Replace the prefix with one HDFS Shell understands
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| 76 | $path =~ s/HDFSShell:/hdfs:/;
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| 77 | # special case for standard streams
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| 78 | if ($path eq '-')
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| 79 | {
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| 80 | $arguments .= '- ';
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| 81 | }
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| 82 | else
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| 83 | {
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| 84 | $arguments .= '"' . $path . '" ';
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| 85 | }
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| 86 | }
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| 87 | my $command = 'hadoop fs -' . $action . ' ' . $arguments;
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| 88 | &_printDebug(' -> _generateHDFSCommand("' . $action . '", ...) => |' . $command . '|');
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| 89 | return $command;
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| 90 | }
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| 91 | ## _generateHDFSCommand()
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| 92 |
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| 93 |
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| 94 | ## @function _printDebug()
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| 95 | #
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| 96 | sub _printDebug
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| 97 | {
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| 98 | my ($message) = @_;
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| 99 | if ($debug)
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| 100 | {
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| 101 | print STDERR '[DEBUG] ' . $message . "\n";
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| 102 | }
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| 103 | }
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| 104 | ## _printDebug()
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| 105 |
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| 106 |
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| 107 | ################################################################################
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| 108 | ############################### Public Functions ###############################
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| 109 | ################################################################################
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| 110 |
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| 111 |
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| 112 | ## @function canRead()
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| 113 | #
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| 114 | sub canRead
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| 115 | {
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| 116 | my $path = shift(@_);
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| 117 | # On my Hadoop setups it appears everyone can read everything... pretty sure
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| 118 | # this won't always be the case but I'm not sure if there is some easy way to
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| 119 | # determine readability (you'd need to parse the permissions, user, and group
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| 120 | # and then somehow compare to the current user). So instead I'll just return
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| 121 | # if the file exists
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| 122 | return &fileTest($path, '-f');
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| 123 | }
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| 124 | ## canRead()
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| 125 |
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| 126 |
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| 127 | ## @function closeFileHandle()
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| 128 | #
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| 129 | sub closeFileHandle
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| 130 | {
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| 131 | my $fh_ref = shift(@_);
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| 132 | close($$fh_ref);
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| 133 | return 1;
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| 134 | }
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| 135 | ## closeFileHandle()
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| 136 |
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| 137 |
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| 138 | ## @function fileSize()
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| 139 | #
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| 140 | sub fileSize
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| 141 | {
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| 142 | my ($path) = @_;
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| 143 | my $file_stats = &fileStats($path);
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| 144 | return $file_stats->{'filesize'};
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| 145 | }
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| 146 | ## fileSize()
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| 147 |
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| 148 |
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| 149 | ## @function fileStats()
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| 150 | #
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| 151 | sub fileStats
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| 152 | {
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| 153 | my ($path) = @_;
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| 154 | my $stats = {};
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| 155 | my $result = &_executeHDFSCommand(1, 'ls', $path);
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| 156 | # - parse the results
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| 157 | 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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| 158 | {
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| 159 | $stats->{'filename'} = $8;
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| 160 | $stats->{'replicas'} = $2;
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| 161 | $stats->{'filesize'} = $5;
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| 162 | $stats->{'modification_date'} = $6;
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| 163 | $stats->{'modification_time'} = $7;
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| 164 | $stats->{'permissions'} = $1;
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| 165 | $stats->{'userid'} = $3;
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| 166 | $stats->{'groupid'} = $4;
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| 167 | }
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| 168 | else
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| 169 | {
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| 170 | &FileUtils::printError('Failed to parse -ls result: ' . $result, 1);
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| 171 | }
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| 172 | return $stats;
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| 173 | }
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| 174 | ## fileStats()
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| 175 |
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| 176 |
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| 177 | ## @function fileTest()
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| 178 | #
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| 179 | sub fileTest
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| 180 | {
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| 181 | my ($filename_full_path, $test_op) = @_;
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| 182 | # Sanity tests
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| 183 | # Special case: HDFS doesn't support symlinking - swap for -e instead
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| 184 | if (!defined $test_op || $test_op eq '-l')
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| 185 | {
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| 186 | $test_op = '-e';
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| 187 | }
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| 188 | my $retval = -1; # cmd return fails > 0 are errors
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| 189 | # Special case: the easiest way to support -f is to run a -e followed by a -d
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| 190 | # (which should fail for files)
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| 191 | if ($test_op eq '-f')
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| 192 | {
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| 193 | my $retval1 = &_executeHDFSCommand(0, 'test -e', $filename_full_path);
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| 194 | if ($retval1 == 0)
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| 195 | {
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| 196 | my $retval2 = &_executeHDFSCommand(0, 'test -d', $filename_full_path);
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| 197 | if ($retval2 > 0)
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| 198 | {
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| 199 | $retval = 0;
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| 200 | }
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| 201 | }
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| 202 | }
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| 203 | # very limited test op support for HDFS
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| 204 | elsif ($test_op ne '-d' && $test_op ne '-e' && $test_op ne '-z')
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| 205 | {
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| 206 | &FileUtils::printError('Unknown or unsupported test mode: ' . $test_op);
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| 207 | }
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| 208 | else
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| 209 | {
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| 210 | $retval = &_executeHDFSCommand(0, 'test ' . $test_op, $filename_full_path);
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| 211 | }
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| 212 | return ($retval == 0 ? 1 : 0);
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| 213 | }
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| 214 | ## fileTest()
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| 215 |
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| 216 |
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| 217 | ## @function filenameConcatenate()
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| 218 | #
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| 219 | sub filenameConcatenate
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| 220 | {
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| 221 | my $protocol = shift(@_);
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| 222 | my $filename = join('/', @_);
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| 223 | # remove repeated slashes
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| 224 | $filename =~ s/[\/]+/\//g;
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| 225 | # append protocol (which may cause multiple slashes)
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| 226 | $filename = $protocol . '/' . $filename;
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| 227 | # strip any trailing slashes
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| 228 | $filename =~ s/[\\\/]$//;
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| 229 | return $filename;
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| 230 | }
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| 231 | ## filenameConcatenate()
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| 232 |
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| 233 |
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| 234 | ## @function isFilenameAbsolute()
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| 235 | #
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| 236 | sub isFilenameAbsolute
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| 237 | {
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| 238 | # File paths against HDFS must be.
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| 239 | return 1;
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| 240 | }
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| 241 | # isFilenameAbsolute()
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| 242 |
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| 243 |
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| 244 | ## @function isHDFS
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| 245 | #
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| 246 | sub isHDFS
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| 247 | {
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| 248 | return 1;
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| 249 | }
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| 250 | ## isHDFS()
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| 251 |
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| 252 |
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| 253 | ## @function isSpecialDirectory
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| 254 | #
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| 255 | sub isSpecialDirectory
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| 256 | {
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| 257 | my ($path) = @_;
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| 258 | return ($path =~ /^HDFSShell:\/\/[a-zA-Z]+:\d+$/);
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| 259 | }
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| 260 | ## isSpecialDirectory()
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| 261 |
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| 262 |
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| 263 | ## @function makeDirectory()
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| 264 | #
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| 265 | sub makeDirectory
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| 266 | {
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| 267 | my ($dir) = @_;
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| 268 | my $result = &_executeHDFSCommand(0, 'mkdir', $dir);
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| 269 | # HDFSShell mkdir returns 0 on success, -1 on failure
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| 270 | return ($result == 0 ? 1 : 0);
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| 271 | }
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| 272 | ## makeDirectory()
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| 273 |
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| 274 |
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| 275 | ## @function modificationTime()
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| 276 | #
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| 277 | sub modificationTime
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| 278 | {
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| 279 | my ($path) = @_;
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| 280 | &FileUtils::printWarning("modificationTime() not supported");
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| 281 | my $file_stats = &fileStats($path);
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| 282 | my $mod_date = $file_stats->{'modification_date'};
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| 283 | $mod_date =~ /(\d\d\d\d)-(\d\d)-(\d\d)/;
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| 284 | my $mod_year = $1;
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| 285 | my $mod_month = $2;
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| 286 | my $mod_day = $3;
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| 287 | my $mod_time = $file_stats->{'modification_time'};
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| 288 | $mod_time =~ /(\d\d):(\d\d)/;
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| 289 | my $mod_hour = $1;
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| 290 | my $mod_minute = $2;
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| 291 | return 0;
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| 292 | }
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| 293 | ## modificationTime()
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| 294 |
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| 295 |
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| 296 | ## @function openFileHandle()
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| 297 | #
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| 298 | sub openFileHandle
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| 299 | {
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| 300 | my ($path, $mode, $fh_ref) = @_;
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| 301 | if ($mode eq '>>' || $mode eq 'a')
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| 302 | {
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| 303 | &FileUtils::printError('Append (>>) mode not supported', 1);
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| 304 | }
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| 305 | elsif ($mode eq '>' || $mode eq 'w')
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| 306 | {
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| 307 | # the put command fails if the file already exists
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| 308 | if (&fileTest($path, '-e'))
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| 309 | {
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| 310 | &removeFiles($path);
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| 311 | }
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| 312 | open($$fh_ref, '| ' . &_generateHDFSCommand('put', '-', $path)) or &FileUtils::printError('Failed to open pipe to HDFS (put) for writing: ' . $path, 1);
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| 313 | }
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| 314 | else
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| 315 | {
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| 316 | open($$fh_ref, &_generateHDFSCommand('cat', $path) . ' |') or &FileUtils::printError('Failed to open pipe to HDFS (cat) for reading: ' . $path, 1);
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| 317 | }
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| 318 | return 1;
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| 319 | }
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| 320 | ## openFileHandle()
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| 321 |
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| 322 |
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| 323 | ## @function readDirectory()
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| 324 | #
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| 325 | sub readDirectory
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| 326 | {
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| 327 | my ($path) = @_;
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| 328 | my @files;
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| 329 | my $result = &_executeHDFSCommand(1, 'ls', $path);
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| 330 | if ($result =~ /No such file or directory/)
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| 331 | {
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| 332 | print STDERR "BOOM! BOOM! BOOM!\n";
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| 333 | return undef;
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| 334 | }
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| 335 | my @lines = split(/\r?\n/, $result);
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| 336 | foreach my $line (@lines)
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| 337 | {
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| 338 | if ($line =~ /\/([^\/]+)$/)
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| 339 | {
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| 340 | my $file = $1;
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| 341 | push(@files, $file);
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| 342 | }
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| 343 | }
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| 344 | return \@files;
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| 345 | }
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| 346 | ## readDirectory()
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| 347 |
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| 348 |
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| 349 | ## @function removeFiles()
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| 350 | #
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| 351 | sub removeFiles
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| 352 | {
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| 353 | my ($path, $including_dir) = @_;
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| 354 | my $result;
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| 355 | if (defined $including_dir && $including_dir)
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| 356 | {
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| 357 | $result = &_executeHDFSCommand(0, 'rmr', $path);
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| 358 | }
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| 359 | else
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| 360 | {
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| 361 | $result = &_executeHDFSCommand(0, 'rm', $path);
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| 362 | }
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| 363 | # HDFSShell mkdir returns 0 on success, -1 on failure
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| 364 | return ($result == 0 ? 1 : 0);
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| 365 | }
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| 366 | ## removeFiles()
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| 367 |
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| 368 |
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| 369 | ## @function removeFilesFiltered()
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| 370 | #
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| 371 | sub removeFilesFiltered
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| 372 | {
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| 373 | my ($paths, $accept_re, $reject_re) = @_;
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| 374 | # Perform a depth first, recursive, removal of files and directories that
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| 375 | # match the given accept and reject patterns
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| 376 | my @paths_array = (ref $paths eq "ARRAY") ? @$paths : ($paths);
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| 377 | my $num_removed = 0;
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| 378 | foreach my $path (@paths_array)
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| 379 | {
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| 380 | # remove trailing slashes
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| 381 | $path =~ s/[\/\\]+$//;
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| 382 | if (!&fileTest($path, '-e'))
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| 383 | {
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| 384 | &FileUtils::printError('path does not exist: ' . $path);
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| 385 | }
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| 386 | elsif (&fileTest($path, '-d'))
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| 387 | {
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| 388 | my @files = @{&readDirectory($path)};
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| 389 | foreach my $file (@files)
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| 390 | {
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| 391 | my $child_path = $path . '/' . $file;
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| 392 | $num_removed += &removeFilesFiltered($child_path, $accept_re, $reject_re);
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| 393 | }
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| 394 | if (!defined $accept_re && !defined $reject_re)
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| 395 | {
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| 396 | # remove this directory
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| 397 | my $result = &removeFiles($path, 1);
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| 398 | if ($result != 1)
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| 399 | {
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| 400 | &FileUtils::printError('could not remove directory: ' . $path);
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| 401 | }
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| 402 | else
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| 403 | {
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| 404 | $num_removed++;
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| 405 | }
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| 406 | }
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| 407 | }
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| 408 | else
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| 409 | {
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| 410 | if (defined $reject_re && ($path =~ m/$reject_re/))
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| 411 | {
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| 412 | next;
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| 413 | }
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| 414 | if ((!defined $accept_re) || ($path =~ m/$accept_re/))
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| 415 | {
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| 416 | # remove this file
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| 417 | my $result = &removeFiles($path);
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| 418 | if ($result != 1)
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| 419 | {
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| 420 | &FileUtils::printError('could not remove file: ' . $path);
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| 421 | }
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| 422 | else
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| 423 | {
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| 424 | $num_removed++;
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| 425 | }
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| 426 | }
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| 427 | }
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| 428 | }
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| 429 | return $num_removed;
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| 430 | }
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| 431 | ## removeFilesFiltered()
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| 432 |
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| 433 |
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| 434 | ## @function removeFilesRecursive()
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| 435 | #
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| 436 | sub removeFilesRecursive
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| 437 | {
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| 438 | my ($path) = @_;
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| 439 | # use the more general removeFilesFiltered() function with no accept
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| 440 | # or reject expressions
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| 441 | return &removeFilesFiltered($path, undef, undef);
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| 442 | }
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| 443 | ## removeFilesRecursive()
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| 444 |
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| 445 |
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| 446 | ## @function supportsSymbolicLink
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| 447 | #
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| 448 | sub supportsSymbolicLink
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| 449 | {
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| 450 | return 0;
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| 451 | }
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| 452 | ## supportsSymbolicLink()
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| 453 |
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| 454 |
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| 455 | ## @function transferFile()
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| 456 | #
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| 457 | sub transferFile
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| 458 | {
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| 459 | my ($mode, $src, $dst) = @_;
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| 460 | my $result;
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| 461 | if ($mode eq 'COPY')
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| 462 | {
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| 463 | $result = &_executeHDFSCommand(0, 'cp', $src, $dst);
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| 464 | }
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| 465 | else
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| 466 | {
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| 467 | $result = &_executeHDFSCommand(0, 'mv', $src, $dst);
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| 468 | }
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| 469 | # HDFSShell mkdir returns 0 on success, -1 on failure
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| 470 | return ($result == 0 ? 1 : 0);
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| 471 | }
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| 472 | ## transferFile()
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|---|
| 473 |
|
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| 474 |
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| 475 | ## @function transferFileFromLocal()
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| 476 | #
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|---|
| 477 | sub transferFileFromLocal
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|---|
| 478 | {
|
|---|
| 479 | my ($mode, $src, $dst) = @_;
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|---|
| 480 | if (!-f $src)
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|---|
| 481 | {
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|---|
| 482 | &FileUtils::printError('Source file (during ' . $mode . ') doesn\'t exists: ' . $src);
|
|---|
| 483 | }
|
|---|
| 484 | if (&fileTest($dst, '-d'))
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|---|
| 485 | {
|
|---|
| 486 | my ($filename) = $src =~ /([^\\\/]+)$/;
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|---|
| 487 | $dst .= '/' . $filename;
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|---|
| 488 | }
|
|---|
| 489 | if (&fileTest($dst, '-f'))
|
|---|
| 490 | {
|
|---|
| 491 | &FileUtils::printError('Destination file (during ' . $mode . ') already exists: ' . $dst);
|
|---|
| 492 | }
|
|---|
| 493 | my $result = &_executeHDFSCommand(0, 'put', $src, $dst);
|
|---|
| 494 | my $remove_result = 1;
|
|---|
| 495 | if ($mode eq 'MOVE')
|
|---|
| 496 | {
|
|---|
| 497 | unlink($src);
|
|---|
| 498 | # failed to delete somehow
|
|---|
| 499 | if (-f $src)
|
|---|
| 500 | {
|
|---|
| 501 | $remove_result = 0;
|
|---|
| 502 | }
|
|---|
| 503 | }
|
|---|
| 504 | return ($result == 0 && $remove_result ? 1 : 0);
|
|---|
| 505 | }
|
|---|
| 506 | ## transferFileFromLocal()
|
|---|
| 507 |
|
|---|
| 508 |
|
|---|
| 509 | ## @function transferFileToLocal()
|
|---|
| 510 | #
|
|---|
| 511 | sub transferFileToLocal
|
|---|
| 512 | {
|
|---|
| 513 | my ($mode, $src, $dst) = @_;
|
|---|
| 514 | if (!&fileTest($src, '-f'))
|
|---|
| 515 | {
|
|---|
| 516 | &FileUtils::printError('Source file (during ' . $mode . ') does not exist: ' . $src);
|
|---|
| 517 | }
|
|---|
| 518 | if (-d $dst)
|
|---|
| 519 | {
|
|---|
| 520 | my ($filename) = $src =~ /([^\\\/]+)$/;
|
|---|
| 521 | $dst .= '/' . $filename;
|
|---|
| 522 | }
|
|---|
| 523 | if (-e $dst)
|
|---|
| 524 | {
|
|---|
| 525 | &FileUtils::printError('Destination file (during ' . $mode . ') already exists: ' . $dst);
|
|---|
| 526 | }
|
|---|
| 527 | my $result = &_executeHDFSCommand(0, 'get', $src, $dst);
|
|---|
| 528 | my $remove_result = 1;
|
|---|
| 529 | if ($mode eq 'MOVE')
|
|---|
| 530 | {
|
|---|
| 531 | $remove_result = &removeFiles($src);
|
|---|
| 532 | }
|
|---|
| 533 | return ($result == 0 && $remove_result ? 1 : 0);
|
|---|
| 534 | }
|
|---|
| 535 | ## transferFileToLocal()
|
|---|
| 536 |
|
|---|
| 537 |
|
|---|
| 538 | 1;
|
|---|
