1 | ################################################################################
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2 | #
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3 | # HDThriftFS.pm -- file functions acting upon a HDFS via thrift
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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) 2013 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 FITNESS
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17 | # FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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18 | # 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 | # Thrift acts as client-server 'relay' between the Perl code and the HDFS. It
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27 | # allows for persistant connections and so is significantly faster than
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28 | # repeatedly starting Hadoop's Java application over and over. In order to
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29 | # connect to the Thrift server this code needs to know the host and port the
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30 | # server may be found on - information currently hard-coded near the top of the
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31 | # script. There are also a number of Perl module API 'bindings' generated by
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32 | # the Thrift compilation process... currently located within the packages of
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33 | # the Parallel Processing extension. Note that I make use of some tie() magic
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34 | # so as to provide calling code with 'file handle'-like objects to interact
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35 | # with (print, readline etc), so that is pretty cool.
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36 |
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37 | package FileUtils::HDThriftFS;
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38 |
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39 | # Pragma
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40 | use strict;
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41 |
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42 | # Setup Environment
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43 | BEGIN
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44 | {
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45 | die "GEXTPARALLELBUILDING not set\n" unless defined $ENV{'GEXTPARALLELBUILDING'};
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46 | die "GSDLOS not set\n" unless defined $ENV{'GSDLOS'};
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47 | die "PERL_VERSION not set\n" unless defined $ENV{'PERL_VERSION'};
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48 | # Bit::Vector and Thrift modules
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49 | unshift (@INC, $ENV{'GEXTPARALLELBUILDING'} . '/' . $ENV{'GSDLOS'} . '/lib/perl/' . $ENV{'PERL_VERSION'});
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50 | # ThriftFS Perl API
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51 | unshift (@INC, $ENV{'GEXTPARALLELBUILDING'} . '/packages/hadoop-1.1.0/contrib/thriftfs/gen-perl');
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52 | }
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53 |
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54 | # Modules - Core
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55 | use Devel::Peek;
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56 | use MIME::Base64;
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57 | use POSIX qw(floor);
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58 | use Symbol;
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59 | use Thrift::Socket;
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60 | use Thrift::BufferedTransport;
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61 | use Thrift::BinaryProtocol;
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62 | # Modules - Thrift
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63 | use HadoopFS::FileSystem;
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64 | # Modules - Greenstone
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65 | use FileUtils::HDThriftFS::ThriftFH;
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66 | use MIME::Base91;
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67 |
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68 | # Configuration
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69 | my $host = "localhost";
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70 | my $port = 58660;
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71 | my $debug_encoding = 0;
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72 |
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73 | # Globals
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74 | my $transport;
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75 | my $thrift_client;
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76 |
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77 |
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78 | ## @function END()
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79 | #
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80 | # Ensure the transport layer, if open, is properly closed
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81 | #
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82 | END
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83 | {
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84 | if (defined $transport)
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85 | {
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86 | $transport->close();
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87 | }
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88 | }
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89 | ## END()
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90 |
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91 |
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92 | ## @function _establishClient()
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93 | #
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94 | sub _establishClient
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95 | {
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96 | if (!defined $thrift_client)
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97 | {
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98 | ###rint "Create Thrift Client to $host:$port\n";
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99 | my $socket = Thrift::Socket->new($host, $port);
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100 | $socket->setSendTimeout(10000);
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101 | $socket->setRecvTimeout(20000);
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102 |
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103 | $transport = Thrift::BufferedTransport->new($socket);
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104 | my $protocol = Thrift::BinaryProtocol->new($transport);
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105 | $thrift_client = HadoopFS::FileSystemClient->new($protocol);
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106 |
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107 | eval { $transport->open(); };
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108 | if ($@)
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109 | {
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110 | &_printError('Unable to connect: ' . $@->{message}, 1);
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111 | }
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112 | }
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113 | }
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114 | ## _establishClient()
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115 |
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116 |
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117 | ## @function _generateHDFSPath()
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118 | #
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119 | sub _generateHDFSPath
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120 | {
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121 | my ($path) = @_;
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122 | if (ref($path) ne 'HadoopFS::Pathname')
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123 | {
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124 | if ($path !~ /HDThriftFS:\/\//)
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125 | {
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126 | &_printError('Not a valid thrift URI: ' . $path);
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127 | }
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128 | else
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129 | {
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130 | $path = HadoopFS::Pathname->new( { pathname => substr($path, 13) } );
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131 | }
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132 | }
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133 | return $path;
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134 | }
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135 | ## _generateHDFSPath()
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136 |
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137 |
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138 | ################################################################################
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139 | ################################################################################
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140 | ################################################################################
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141 |
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142 |
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143 | ## @function closeFileHandle()
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144 | #
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145 | sub closeFileHandle
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146 | {
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147 | my $fh_ref = shift(@_);
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148 | close($$fh_ref);
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149 | untie($$fh_ref);
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150 | return 1;
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151 | }
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152 | ## closeFileHandle()
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153 |
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154 |
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155 | ## @function fileSize()
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156 | #
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157 | sub fileSize
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158 | {
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159 | my ($path, $test_op) = @_;
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160 | # ensure we have a connection to the thrift server
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161 | &_establishClient();
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162 | # - convert the path into a proper thrift path object
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163 | $path = &_generateHDFSPath($path);
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164 | my $file_stat = $thrift_client->stat($path);
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165 | return $file_stat->{length};
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166 | }
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167 | ## fileSize()
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168 |
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169 |
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170 | ## @function fileTest()
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171 | #
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172 | sub fileTest
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173 | {
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174 | my ($raw_path, $test_op) = @_;
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175 | my $result = 0;
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176 | # ensure we have a connection to the thrift server
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177 | &_establishClient();
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178 | # - convert the path into a proper thrift path object
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179 | my $path = &_generateHDFSPath($raw_path);
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180 | # note: symbolic linking not supported within HDFS
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181 | if (!defined $test_op || $test_op eq '-l')
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182 | {
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183 | $test_op = '-e';
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184 | }
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185 | if ($test_op eq '-d')
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186 | {
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187 | if ($thrift_client->exists($path))
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188 | {
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189 | my $file = $thrift_client->stat($path);
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190 | if ($file->{'isdir'})
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191 | {
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192 | $result = 1;
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193 | }
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194 | }
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195 | }
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196 | elsif ($test_op eq '-e')
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197 | {
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198 | if ($thrift_client->exists($path))
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199 | {
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200 | $result = 1;
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201 | }
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202 | }
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203 | elsif ($test_op eq '-f')
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204 | {
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205 | if ($thrift_client->exists($path))
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206 | {
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207 | my $file = $thrift_client->stat($path);
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208 | if (!$file->{'isdir'})
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209 | {
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210 | $result = 1;
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211 | }
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212 | }
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213 | }
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214 | else
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215 | {
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216 | &FileUtils::printError('Unknown or unsupported test mode: ' . $test_op);
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217 | }
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218 | return $result;
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219 | }
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220 | ## fileTest()
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221 |
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222 |
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223 | ## @function filenameConcatenate()
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224 | #
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225 | sub filenameConcatenate
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226 | {
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227 | my $protocol = shift(@_);
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228 | my $filename = join('/', @_);
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229 | # remove repeated slashes
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230 | $filename =~ s/[\/]+/\//g;
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231 | # append protocol (which may cause multiple slashes)
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232 | $filename = $protocol . '/' . $filename;
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233 | # strip any trailing slashes
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234 | $filename =~ s/[\\\/]$//;
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235 | return $filename;
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236 | }
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237 | ## filenameConcatenate()
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238 |
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239 |
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240 | ## @function makeDirectory()
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241 | #
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242 | sub makeDirectory
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243 | {
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244 | my ($raw_path) = @_;
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245 | my $result = 0;
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246 | # ensure we have a connection to the thrift server
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247 | &_establishClient();
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248 | # - convert the path into a proper thrift path object
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249 | my $path = &_generateHDFSPath($raw_path);
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250 | if (!&fileTest($path, '-d'))
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251 | {
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252 | # - create the directory
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253 | $thrift_client->mkdirs($path);
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254 | }
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255 | # - check that it exists
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256 | return (&fileTest($path, '-d'));
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257 | }
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258 | ## makeDirectory()
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259 |
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260 |
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261 | ## @function modificationTime()
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262 | #
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263 | sub modificationTime
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264 | {
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265 | my ($path) = @_;
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266 | # ensure we have a connection to the thrift server
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267 | &_establishClient();
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268 | # - convert the path into a proper thrift path object
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269 | $path = &_generateHDFSPath($path);
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270 | my $file_stat = $thrift_client->stat($path);
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271 | return floor($file_stat->{modificationTime} / 1000);
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272 | }
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273 | ## modificationTime()
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274 |
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275 |
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276 | ## @function openFileHandle()
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277 | #
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278 | sub openFileHandle
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279 | {
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280 | my ($raw_path, $mode, $fh_ref) = @_;
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281 | # ensure we have a connection to the thrift server
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282 | &_establishClient();
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283 | #rint STDERR "DEBUG: openFileHandle($raw_path, $mode, fh_ref)\n";
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284 | my $path = &_generateHDFSPath($raw_path);
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285 | my $fh = gensym();
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286 | tie(*$fh, "FileUtils::HDThriftFS::ThriftFH", $thrift_client);
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287 | open($fh, $path, $mode) or die("Failed to open thriftfs");
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288 | $$fh_ref = $fh;
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289 | return 1;
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290 | }
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291 | ## openFileHandle()
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292 |
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293 |
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294 | ## @function readDirectory()
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295 | #
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296 | sub readDirectory
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297 | {
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298 | my ($raw_path) = @_;
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299 | my @files;
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300 | # ensure we have a connection to the thrift server
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301 | &_establishClient();
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302 | my $path = &_generateHDFSPath($raw_path);
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303 | my $raw_files = $thrift_client->listStatus($path);
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304 | if ($raw_files && @{$raw_files} > 0)
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305 | {
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306 | foreach my $file_stat (@{$raw_files})
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307 | {
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308 | my $file_path = $file_stat->{'path'};
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309 | my ($filename) = $file_path =~ /([^\\\/]+)$/;
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310 | push(@files, $filename);
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311 | }
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312 | }
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313 | return \@files;
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314 | }
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315 | ## readDirectory()
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316 |
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317 |
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318 | ## @function removeFiles()
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319 | #
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320 | sub removeFiles
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321 | {
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322 | my ($path, $recursive) = @_;
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323 | my $result = 0;
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324 | if (!defined $recursive)
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325 | {
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326 | $recursive = 0;
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327 | }
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328 | # ensure we have a connection to the thrift server
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329 | &_establishClient();
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330 | # - convert the path into a proper thrift path object as necessary
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331 | $path = &_generateHDFSPath($path);
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332 | if ($thrift_client->exists($path) && ($recursive || &fileTest($path, '-f')))
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333 | {
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334 | $thrift_client->rm($path, $recursive);
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335 | $result = !$thrift_client->exists($path);
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336 | }
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337 | return $result;
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338 | }
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339 | ## removeFiles()
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340 |
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341 |
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342 | ## @function removeFilesFiltered()
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343 | #
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344 | sub removeFilesFiltered
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345 | {
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346 | my ($paths, $accept_re, $reject_re) = @_;
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347 | # ensure we have a connection to the thrift server
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348 | &_establishClient();
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349 | # Perform a depth first, recursive, removal of files and directories that
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350 | # match the given accept and reject patterns
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351 | my @paths_array = (ref $paths eq "ARRAY") ? @$paths : ($paths);
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352 | my $num_removed = 0;
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353 | foreach my $raw_path (@paths_array)
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354 | {
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355 | # remove trailing slashes
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356 | $raw_path =~ s/[\/\\]+$//;
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357 | my $path = &_generateHDFSPath($raw_path);
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358 | if (!$thrift_client->exists($path))
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359 | {
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360 | print STDERR "HDThriftFS::removeFilesFiltered() path does not exist: " . $raw_path . "\n";
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361 | }
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362 | elsif (&fileTest($path, '-d'))
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363 | {
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364 | my @files = @{&readDirectory($path)};
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365 | foreach my $file (@files)
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366 | {
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367 | my $child_path = $raw_path . '/' . $file;
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368 | $num_removed += &removeFilesFiltered($child_path, $accept_re, $reject_re);
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369 | }
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370 | if (!defined $accept_re && !defined $reject_re)
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371 | {
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372 | # remove this directory - non-recursively so that the command fails
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373 | # if there are (somehow) still files contained within
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374 | $thrift_client->rm($path, 0);
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375 | if ($thrift_client->exists($path))
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376 | {
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377 | print STDERR "HDThriftFS::removeFilesFiltered() couldn't remove directory: " . $raw_path . "\n";
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378 | }
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379 | else
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380 | {
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381 | $num_removed++;
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382 | }
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383 | }
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384 | }
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385 | else
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386 | {
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387 | if (defined $reject_re && ($raw_path =~ m/$reject_re/))
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388 | {
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389 | next;
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390 | }
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391 | if ((!defined $accept_re) || ($raw_path =~ m/$accept_re/))
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392 | {
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393 | # remove this file
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394 | $thrift_client->rm($path, 0);
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395 | if ($thrift_client->exists($path))
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396 | {
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397 | print STDERR "HDThriftFS::removeFilesFiltered() couldn't remove file: " . $raw_path . "\n";
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398 | }
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399 | else
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400 | {
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401 | $num_removed++;
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402 | }
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403 | }
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404 | }
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405 | }
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406 | return $num_removed;
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407 | }
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408 | ## removeFilesFiltered()
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409 |
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410 |
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411 | ## @function removeFilesRecursive()
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412 | #
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413 | sub removeFilesRecursive
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414 | {
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415 | my ($path) = @_;
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416 | # use the more general removeFilesFiltered() function with no accept or reject
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417 | # expressions
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418 | return &removeFilesFiltered($path, undef, undef);
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419 | }
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420 | ## removeFilesRecursive()
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421 |
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422 |
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423 | ## @function supportsSymbolicLink
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424 | #
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425 | sub supportsSymbolicLink
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426 | {
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427 | return 0;
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428 | }
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429 | ## supportsSymbolicLink()
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430 |
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431 |
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432 | ## @function transferFile()
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433 | #
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434 | sub transferFile
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435 | {
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436 | my ($mode, $src, $dst) = @_;
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437 | # ensure we have a connection to the thrift server
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438 | &_establishClient();
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439 | #rint STDERR "transferFile($mode, $src, $dst)\n";
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440 | my $src_path = &_generateHDFSPath($src);
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441 | my $dst_path = &_generateHDFSPath($dst);
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442 | if (&fileTest($dst_path, '-d'))
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443 | {
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444 | my ($filename) = $src =~ /([^\\\/]+)$/;
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445 | $dst .= '/' . $filename;
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446 | $dst_path = &_generateHDFSPath($dst);
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447 | }
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448 | if (!$thrift_client->exists($src_path))
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449 | {
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450 | &FileUtils::printError('Source file (during ' . $mode . ') does not exist: ' . $src);
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451 | return 0;
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452 | }
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453 | if ($thrift_client->exists($dst_path))
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454 | {
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455 | &FileUtils::printError('Destination file (during ' . $mode . ') already exists: ' . $dst);
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456 | return 0;
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457 | }
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458 | # what happens next depends on the mode, and is either very easy or really
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459 | # hard
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460 | if ($mode eq 'MOVE')
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461 | {
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462 | $thrift_client->rename($src_path, $dst_path);
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463 | }
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464 | elsif ($mode eq 'COPY')
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465 | {
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466 | # Open the src file for reading
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467 | #rint STDERR "DEBUG: FHIN opened (should be 'r'): $src\n";
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468 | my $fhin = $thrift_client->open($src_path);
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469 | # Create the dst file for writing
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470 | #rint STDERR "DEBUG: FHOUT created (should be 'w'): $dst\n";
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471 | my $fhout = $thrift_client->create($dst_path);
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472 | # Read all of src file writing to dst file
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473 | # - this is where things have the potential to go wrong, as it doesn't seem
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474 | # thrift supports writing bytes
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475 | # - only strings. May need to see if I can make Perl behave using black
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476 | # magic flags (marking string as binary etc) It'll work fine for text
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477 | # files though
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478 | my $data = undef;
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479 | my $offset = 0;
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480 | my $length = 4096;
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481 | # Read 4K blocks at a time
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482 | while ($data = $thrift_client->read($fhin, $offset, $length))
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483 | {
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484 | $thrift_client->write($fhout, $data);
|
---|
485 | $offset += $length;
|
---|
486 | if (length ($data) < $length)
|
---|
487 | {
|
---|
488 | last;
|
---|
489 | }
|
---|
490 | }
|
---|
491 | # Close files
|
---|
492 | $thrift_client->close($fhout);
|
---|
493 | $thrift_client->close($fhin);
|
---|
494 | }
|
---|
495 | my $result = ($thrift_client->exists($dst_path));
|
---|
496 | #rint STDERR "transferFile() => $result\n";
|
---|
497 | return $result;
|
---|
498 | }
|
---|
499 | ## transferFile()
|
---|
500 |
|
---|
501 |
|
---|
502 | ## @function transferFileFromLocal()
|
---|
503 | #
|
---|
504 | sub transferFileFromLocal
|
---|
505 | {
|
---|
506 | my ($mode, $src, $dst) = @_;
|
---|
507 | # ensure we have a connection to the thrift server
|
---|
508 | &_establishClient();
|
---|
509 | # destination is remote
|
---|
510 | my $dst_path = &_generateHDFSPath($dst);
|
---|
511 | if (&fileTest($dst_path, '-d'))
|
---|
512 | {
|
---|
513 | my ($filename) = $src =~ /([^\\\/]+)$/;
|
---|
514 | $dst .= '/' . $filename;
|
---|
515 | $dst_path = &_generateHDFSPath($dst);
|
---|
516 | }
|
---|
517 | # can't replace - if the file already exists
|
---|
518 | if (&fileTest($dst_path, '-f'))
|
---|
519 | {
|
---|
520 | &FileUtils::printError('Destination file (during ' . $mode . ') already exists: ' . $dst);
|
---|
521 | return 0;
|
---|
522 | }
|
---|
523 | # copy the file
|
---|
524 | my $fhin;
|
---|
525 | open($fhin, '<:raw', $src) or die("Failed to open file for reading: " . $src . " (" . $! . ")");
|
---|
526 | my $decoded = '';
|
---|
527 | my $fhout = $thrift_client->create($dst_path);
|
---|
528 | while (read($fhin, $decoded, 4096))
|
---|
529 | {
|
---|
530 | if ($debug_encoding)
|
---|
531 | {
|
---|
532 | print STDERR "Writing Data: \n=== START ===\n"; Dump($decoded); print STDERR "\n=== END ===\n\n";
|
---|
533 | }
|
---|
534 | # Base64 encode to protect binary
|
---|
535 | #my $encoded = encode_base64($decoded);
|
---|
536 | # Base91 encode to protect binary - we add a Byte Order Marker so the
|
---|
537 | # Thrift Server can detect the need to decode the string sent
|
---|
538 | my $encoded = MIME::Base91::encode($decoded);
|
---|
539 | if ($debug_encoding)
|
---|
540 | {
|
---|
541 | print STDERR "Encoded: \n=== START ===\n"; Dump($encoded); print STDERR "\n=== END ===\n\n";
|
---|
542 | }
|
---|
543 | $thrift_client->write($fhout, $encoded);
|
---|
544 | }
|
---|
545 | close($fhin);
|
---|
546 | $thrift_client->close($fhout);
|
---|
547 | # in general, the transfer has worked if the destination file exists
|
---|
548 | my $result = $thrift_client->exists($dst_path);
|
---|
549 | # if moving, remove the source file from the local filesystem
|
---|
550 | if ($mode eq 'MOVE')
|
---|
551 | {
|
---|
552 | unlink($src);
|
---|
553 | # update result to reflect if we successfully removed the src file
|
---|
554 | $result = $result && (!-f $src);
|
---|
555 | }
|
---|
556 | return $result
|
---|
557 | }
|
---|
558 | ## transferFileFromLocal()
|
---|
559 |
|
---|
560 |
|
---|
561 | ## @function transferFileToLocal()
|
---|
562 | #
|
---|
563 | sub transferFileToLocal
|
---|
564 | {
|
---|
565 | my ($mode, $src, $dst) = @_;
|
---|
566 | # ensure we have a connection to the thrift server
|
---|
567 | &_establishClient();
|
---|
568 | # source is remote
|
---|
569 | my $src_path = &_generateHDFSPath($src);
|
---|
570 | if (!$thrift_client->exists($src_path))
|
---|
571 | {
|
---|
572 | &FileUtils::printError('Source file (during ' . $mode . ') does not exist: ' . $src);
|
---|
573 | return 0;
|
---|
574 | }
|
---|
575 | if (-d $dst)
|
---|
576 | {
|
---|
577 | my ($filename) = $src =~ /([^\\\/]+)$/;
|
---|
578 | $dst .= '/' . $filename;
|
---|
579 | }
|
---|
580 | if (-e $dst)
|
---|
581 | {
|
---|
582 | &FileUtils::printError('Destination file (during ' . $mode . ') already exists: ' . $dst);
|
---|
583 | return 0;
|
---|
584 | }
|
---|
585 | # open local file
|
---|
586 | my $fhout;
|
---|
587 | my $encoded = undef;
|
---|
588 | my $offset = 0;
|
---|
589 | my $length = 4096; # Read 4K blocks at a time
|
---|
590 | open($fhout, '>:raw', $dst) or die("Failed to open file for writing: " . $dst);
|
---|
591 | my $fhin = $thrift_client->open($src_path);
|
---|
592 | while ($encoded = $thrift_client->read($fhin, $offset, $length))
|
---|
593 | {
|
---|
594 | if ($debug_encoding)
|
---|
595 | {
|
---|
596 | print STDERR "Reading Data: \n=== START ===\n"; Dump($encoded); print STDERR "\n=== END ===\n\n";
|
---|
597 | }
|
---|
598 | #my $decoded = decode_base64($encoded);
|
---|
599 | my $decoded = MIME::Base91::decode($encoded);
|
---|
600 | if ($debug_encoding)
|
---|
601 | {
|
---|
602 | print STDERR "Decoded: \n=== START ===\n"; Dump($decoded); print STDERR "\n=== END ===\n\n";
|
---|
603 | }
|
---|
604 | print $fhout $decoded;
|
---|
605 | last if (length ($encoded) < $length);
|
---|
606 | $offset += $length;
|
---|
607 | }
|
---|
608 | close($fhout);
|
---|
609 | $thrift_client->close($fhin);
|
---|
610 | # in general, the transfer has worked if the destination file exists
|
---|
611 | my $result = (-f $dst);
|
---|
612 | # if moving, remove the source file from the HDFS filesystem
|
---|
613 | if ($mode eq 'MOVE')
|
---|
614 | {
|
---|
615 | $thrift_client->rm($src_path, 0);
|
---|
616 | # update result to reflect if we successfully removed the src file
|
---|
617 | $result = $result && !$thrift_client->exists($src_path);
|
---|
618 | }
|
---|
619 | return $result;
|
---|
620 | }
|
---|
621 | ## transferFileToLocal()
|
---|
622 |
|
---|
623 |
|
---|
624 | 1;
|
---|