1 | ###########################################################################
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2 | #
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3 | # WgetDownload.pm -- Download base module that handles calling Wget
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4 | # A component of the Greenstone digital library software
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5 | # from the New Zealand Digital Library Project at the
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6 | # University of Waikato, New Zealand.
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7 | #
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8 | # Copyright (C) 2006 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
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11 | # it under the terms of the GNU General Public License as published by
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12 | # the Free Software Foundation; either version 2 of the License, or
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13 | # (at your option) any later version.
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14 | #
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15 | # This program is distributed in the hope that it will be useful,
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16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 | # GNU General Public License for more details.
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19 | #
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20 | # You should have received a copy of the GNU General Public License
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21 | # along with this program; if not, write to the Free Software
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22 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23 | #
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24 | ###########################################################################
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25 |
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26 | package WgetDownload;
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27 |
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28 | eval {require bytes};
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29 |
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30 | # suppress the annoying "subroutine redefined" warning that various
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31 | # plugins cause under perl 5.6
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32 | $SIG{__WARN__} = sub {warn($_[0]) unless ($_[0] =~ /Subroutine\s+\S+\sredefined/)};
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33 |
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34 | use BaseDownload;
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35 | use strict;
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36 | use Cwd;
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37 | use util;
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38 | use IPC::Open3;
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39 | use IO::Select;
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40 | use IO::Socket;
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41 |
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42 |
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43 | sub BEGIN {
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44 | @WgetDownload::ISA = ('BaseDownload');
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45 | }
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46 |
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47 | my $arguments =
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48 | [ { 'name' => "proxy_on",
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49 | 'desc' => "{WgetDownload.proxy_on}",
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50 | 'type' => "flag",
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51 | 'reqd' => "no",
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52 | 'hiddengli' => "yes"},
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53 | { 'name' => "http_proxy_host",
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54 | 'desc' => "{WgetDownload.http_proxy_host}",
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55 | 'type' => "string",
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56 | 'reqd' => "no",
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57 | 'hiddengli' => "yes"},
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58 | { 'name' => "http_proxy_port",
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59 | 'desc' => "{WgetDownload.http_proxy_port}",
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60 | 'type' => "string",
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61 | 'reqd' => "no",
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62 | 'hiddengli' => "yes"},
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63 | { 'name' => "https_proxy_host",
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64 | 'desc' => "{WgetDownload.https_proxy_host}",
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65 | 'type' => "string",
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66 | 'reqd' => "no",
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67 | 'hiddengli' => "yes"},
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68 | { 'name' => "https_proxy_port",
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69 | 'desc' => "{WgetDownload.https_proxy_port}",
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70 | 'type' => "string",
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71 | 'reqd' => "no",
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72 | 'hiddengli' => "yes"},
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73 | { 'name' => "ftp_proxy_host",
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74 | 'desc' => "{WgetDownload.ftp_proxy_host}",
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75 | 'type' => "string",
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76 | 'reqd' => "no",
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77 | 'hiddengli' => "yes"},
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78 | { 'name' => "ftp_proxy_port",
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79 | 'desc' => "{WgetDownload.ftp_proxy_port}",
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80 | 'type' => "string",
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81 | 'reqd' => "no",
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82 | 'hiddengli' => "yes"},
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83 | { 'name' => "user_name",
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84 | 'desc' => "{WgetDownload.user_name}",
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85 | 'type' => "string",
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86 | 'reqd' => "no",
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87 | 'hiddengli' => "yes"},
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88 | { 'name' => "user_password",
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89 | 'desc' => "{WgetDownload.user_password}",
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90 | 'type' => "string",
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91 | 'reqd' => "no",
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92 | 'hiddengli' => "yes"},
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93 | { 'name' => "no_check_certificate",
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94 | 'desc' => "{WgetDownload.no_check_certificate}",
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95 | 'type' => "flag",
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96 | 'reqd' => "no",
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97 | 'hiddengli' => "yes"}
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98 | ];
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99 |
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100 | my $options = { 'name' => "WgetDownload",
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101 | 'desc' => "{WgetDownload.desc}",
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102 | 'abstract' => "yes",
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103 | 'inherits' => "yes",
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104 | 'args' => $arguments };
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105 |
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106 |
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107 | # Declaring file global variables related to the wget child process so that
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108 | # the termination signal handler for SIGTERM can close the streams and tidy
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109 | # up before ending the child process.
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110 | my $childpid;
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111 | my ($chld_out, $chld_in);
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112 | my ($serverSocket, $read_set);
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113 |
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114 | my $TIMEOUT = 1; # seconds
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115 | my $NUM_TRIES = 10;
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116 |
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117 | # The port this script's server socket will be listening on, to handle
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118 | # incoming signals from GLI to terminate wget. This is also file global,
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119 | # since OAIDownload.pm will make several calls on wget using the same
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120 | # instance of this script and we want to reuse whatever port GLI gave us.
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121 | my $port;
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122 |
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123 | # When this script is called from the command line, this handler will be called
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124 | # if this process is killed or abruptly ends due to receiving one of the
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125 | # terminating signals that this handler is registered to deal with.
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126 | sub abrupt_end_handler {
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127 | my $termination_signal = shift (@_);
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128 |
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129 | if(defined $childpid) {
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130 | close($chld_out);
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131 | close($chld_in);
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132 |
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133 | print STDOUT "Received termination signal: $termination_signal\n";
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134 |
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135 | # Send TERM signal to child process to terminate it. Sending the INT signal doesn't work
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136 | # See http://perldoc.perl.org/perlipc.html#Signals
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137 | # Warning on using kill at http://perldoc.perl.org/perlfork.html
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138 | kill("TERM", $childpid); # prefix - to signal to kill process group
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139 |
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140 | # If the SIGTERM sent on Linux calls this handler, we want to make
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141 | # sure any socket connection is closed.
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142 | # Otherwise sockets are only used when this script is run from GLI
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143 | # in which case the handlers don't really get called.
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144 | if(defined $serverSocket) {
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145 | $read_set->remove($serverSocket) if defined $read_set;
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146 | close($serverSocket);
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147 | }
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148 | }
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149 |
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150 | exit(0);
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151 | }
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152 |
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153 | # Registering a handler for when termination signals SIGINT and SIGTERM are received to stop
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154 | # the wget child process. SIGTERM--generated by Java's Process.destroy()--is the default kill
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155 | # signal (kill -15) on Linux, while SIGINT is generated upon Ctrl-C (also on Windows).
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156 | # Note that SIGKILL can't be handled as the handler won't get called for it. More information:
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157 | # http://affy.blogspot.com/p5be/ch13.htm
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158 | # http://perldoc.perl.org/perlipc.html#Signals
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159 | $SIG{'INT'} = \&abrupt_end_handler;
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160 | $SIG{'TERM'} = \&abrupt_end_handler;
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161 |
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162 | sub new {
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163 | my ($class) = shift (@_);
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164 | my ($getlist,$inputargs,$hashArgOptLists) = @_;
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165 | push(@$getlist, $class);
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166 |
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167 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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168 | push(@{$hashArgOptLists->{"OptList"}},$options);
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169 |
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170 | my $self = new BaseDownload($getlist,$inputargs,$hashArgOptLists);
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171 |
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172 | # the wget binary is dependent on the gnomelib_env (particularly lib/libiconv2.dylib) being set, particularly on Mac Lions (android too?)
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173 | &util::set_gnomelib_env(); # this will set the gnomelib env once for each subshell launched, by first checking if GEXTGNOME is not already set
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174 |
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175 | return bless $self, $class;
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176 | }
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177 |
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178 | sub checkWgetSetup
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179 | {
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180 | my ($self,$blnGliCall) = @_;
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181 | #TODO: proxy detection??
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182 |
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183 | if((!$blnGliCall) && $self->{'proxy_on'})
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184 | {
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185 | &checkProxySetup($self);
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186 | }
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187 | &checkURL($self);
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188 | }
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189 |
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190 | # Not using this. On Windows, we used to pass proxying settings as flags to wget. But, as that can be
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191 | # seen with Task Manager, we now have the proxy settings set in the environment and are no longer passing it
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192 | sub addProxySettingsAsWgetFlags
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193 | {
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194 | my ($self) = @_;
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195 | my $strOptions = "";
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196 |
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197 | if($self->{'http_proxy_host'} && $self->{'http_proxy_port'}) {
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198 | $strOptions .= " -e http_proxy=$self->{'http_proxy_host'}:$self->{'http_proxy_port'} ";
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199 | }
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200 | if($self->{'https_proxy_host'} && $self->{'https_proxy_port'}) {
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201 | $strOptions .= " -e https_proxy=$self->{'https_proxy_host'}:$self->{'https_proxy_port'} ";
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202 | }
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203 | if($self->{'ftp_proxy_host'} && $self->{'ftp_proxy_port'}) {
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204 | $strOptions .= " -e ftp_proxy=$self->{'ftp_proxy_host'}:$self->{'ftp_proxy_port'} ";
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205 | }
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206 |
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207 | # For wget, there is only one set pair of proxy-user and proxy-passwd, so wget seems to assume
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208 | # that all 3 proxy protocols (http|https|ftp) will use the same username and pwd combination?
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209 | # Note that this only matters when passing the proxying details as flags to wget, not when
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210 | # the proxies are setup as environment variables.
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211 | if ($self->{'user_name'} && $self->{'user_password'})
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212 | {
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213 | $strOptions .= "--proxy-user=$self->{'user_name'}"." --proxy-passwd=$self->{'user_password'}";
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214 | # how is "--proxy-passwd" instead of "--proxy-password" even working????
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215 | # see https://www.gnu.org/software/wget/manual/html_node/Proxies.html
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216 | # and https://www.gnu.org/software/wget/manual/wget.html
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217 | # Not touching this, in case the manual is simply wrong. Since our code works in
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218 | # practice (when we were still using wget proxy username/pwd flags for windows).
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219 | }
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220 |
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221 | return $strOptions;
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222 | }
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223 |
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224 | sub getWgetOptions
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225 | {
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226 | my ($self) = @_;
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227 | my $strOptions = "";
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228 |
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229 | # If proxy settings are set up in the environment, wget is ready to use them. More secure.
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230 | # But if proxy settings are not set up in the environment, pass them as flags to wget
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231 | # This is less secure, as pwd etc visible in task manager, but it was the original way in
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232 | # which wget was run on windows.
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233 | # Truth in Perl: https://home.ubalt.edu/abento/452/perl/perltruth.html
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234 | # http://www.perlmonks.org/?node=what%20is%20true%20and%20false%20in%20Perl%3F
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235 |
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236 | if ($self->{'proxy_on'}) {
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237 | if(!$ENV{'http_proxy'} && !$ENV{'https_proxy'} && !$ENV{'ftp_proxy'}) {
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238 | $strOptions .= $self->addProxySettingsAsWgetFlags();
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239 | } # else wget will use proxy settings in environment, assume enough settings have been provided
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240 | # either way, we're using the proxy
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241 | $strOptions .= " --proxy ";
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242 | }
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243 |
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244 | if($self->{'no_check_certificate'}) { # URL may be http that gets redirected to https, so if no_check_certificate is on, turn it on even if URL is http
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245 |
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246 | $strOptions .= " --no-check-certificate ";
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247 | }
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248 |
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249 | return $strOptions;
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250 | }
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251 |
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252 | # Checking for proxy setup: proxy server, proxy port, proxy username and password.
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253 | sub checkProxySetup
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254 | {
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255 | my ($self) = @_;
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256 | ($self->{'proxy_on'}) || &error("checkProxySetup","The proxy is not on? How could that be happening?");
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257 | # Setup .wgetrc by using $self->{'proxy_host'} and $self->{'proxy_port'}
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258 | # Test if the connection is successful. If the connection wasn't successful then ask user to supply username and password.
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259 |
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260 | }
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261 |
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262 | # Returns true if the wget status needs to be monitored through sockets
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263 | # (if a socket is used to communicate with the Java program on when to
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264 | # terminate wget). True if we are running gli, or if the particular type
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265 | # of WgetDownload is *not* OAIDownload (in that case, the original way of
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266 | # terminating the perl script from Java would terminate wget as well).
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267 | sub dealingWithSockets() {
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268 | my ($self) = @_;
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269 | return (defined $self->{'gli'} && $self->{'gli'} && !defined $port && ref($self) ne "OAIDownload");
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270 | # use ref($self) to find the classname of an object
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271 | }
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272 |
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273 | # Shouldn't use double quotes around wget path after all? See final comment at
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274 | # http://www.perlmonks.org/?node_id=394709
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275 | # http://coldattic.info/shvedsky/pro/blogs/a-foo-walks-into-a-bar/posts/63
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276 | #
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277 | # IO::Select only works on Windows if using sockets, not if using pipes to child process streams
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278 | # http://www.perlmonks.org/?node_id=869704
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279 | # https://stackoverflow.com/questions/22339761/select-alternative-for-windows-for-both-console-input-and-sockets
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280 | # https://stackoverflow.com/questions/36622189/clarification-regarding-ioselect
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281 | #
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282 | # Attempting to emulate IO::Select's can_read() timeout with alarm():
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283 | # https://stackoverflow.com/questions/4517034/perl-set-read-timeout-in-client-socket
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284 | # It looks like alarm() is not properly supported on Windows either.
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285 | # See footnote of https://perldoc.perl.org/functions/alarm.html
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286 | # http://www.perlmonks.org/bare/?node_id=405469
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287 | # http://www.perlmonks.org/?node_id=881987
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288 | # http://www.perlmonks.org/?node_id=1127570
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289 | #
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290 | # Support for alarm() exists in Strawberry Perl v 5.20 and ActivateState Perl v 5.8.something onwards,
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291 | # however it is limited. The limitation is related to the entry about porting in the perldoc on alarm,
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292 | # see https://perldoc.perl.org/perlport.html#alarm
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293 | # "alarm(Win32) Emulated using timers that must be explicitly polled whenever Perl wants to dispatch "safe signals" and therefore cannot interrupt blocking system calls."
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294 | # http://www.perlmonks.org/?node_id=1127475
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295 | # http://www.perlmonks.org/?node_id=1127570
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296 | # http://www.perlmonks.org/?node=552515
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297 | #
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298 | # Threads don't appear too safe
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299 | # https://perldoc.perl.org/threads.html
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300 | # https://perldoc.perl.org/perlpolicy.html#discouraged
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301 | #
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302 | # HOWEVER, could use Sockets instead of Pipes to process streams to communicate with child proc, so then can use IO::Sockets:
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303 | # http://www.perlmonks.org/?node_id=869942
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304 | # http://www.perlmonks.org/?node_id=811650
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305 | # Though IPC::Run considered ideal, it has limitations on Windows:
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306 | # http://search.cpan.org/~toddr/IPC-Run-0.96/lib/IPC/Run.pm -> http://search.cpan.org/~toddr/IPC-Run-0.96/lib/IPC/Run.pm#Win32_LIMITATIONS
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307 | #
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308 | sub useWget
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309 | {
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310 | #local $| = 1; # autoflush stdout buffer
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311 | #print STDOUT "*** Start of subroutine useWget in $0\n";
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312 |
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313 | my ($self, $cmdWget,$blnShow, $working_dir) = @_;
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314 |
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315 | my ($strReadIn,$strLine,$command);
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316 | $strReadIn = "" unless defined $strReadIn;
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317 |
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318 | my $current_dir = cwd();
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319 | my $changed_dir = 0;
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320 | if (defined $working_dir && -e $working_dir) {
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321 | chdir "$working_dir";
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322 | $changed_dir = 1;
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323 | }
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324 |
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325 | # When we are running this script through GLI, the SIGTERM signal handler
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326 | # won't get called on Windows when wget is to be prematurely terminated.
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327 | # Instead, when wget has to be terminated in the middle of execution, GLI will
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328 | # connect to a serverSocket here to communicate when it's time to stop wget.
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329 | if($self->dealingWithSockets()) {
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330 |
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331 | $port = <STDIN>; # gets a port on localhost that's not yet in use
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332 | chomp($port);
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333 |
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334 | $serverSocket = IO::Socket::INET->new( Proto => 'tcp',
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335 | LocalPort => $port,
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336 | Listen => 1,
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337 | Reuse => 1);
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338 |
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339 | die "can't setup server" unless $serverSocket;
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340 | #print STDOUT "[Serversocket $0 accepting clients at port $port]\n";
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341 |
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342 | $read_set = new IO::Select(); # create handle set for reading
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343 | $read_set->add($serverSocket); # add the main socket to the set
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344 | }
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345 |
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346 | my $wget_file_path = &FileUtils::filenameConcatenate($ENV{'GSDLHOME'}, "bin", $ENV{'GSDLOS'}, "wget");
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347 | # compose the command as an array rather than as a string, to preserve spaces in the filepath
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348 | # because single/double quotes using open3 seem to launch a shell, see final comment at
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349 | # http://www.perlmonks.org/?node_id=394709 and that ends up causing problems in terminating wget
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350 | # as 2 processes then got launched which don't have parent-child pid relationship.
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351 | my @commandargs = split(' ', $cmdWget);
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352 | unshift(@commandargs, $wget_file_path);
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353 | $command = "$wget_file_path $cmdWget";
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354 | print STDOUT "Command is: $command\n"; # displayed in GLI output
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355 | print STDERR "Command is: $command\n"; # goes into ServerInfoDialog
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356 |
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357 | # Wget's output needs to be monitored to find out when it has naturally terminated.
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358 | # Wget's output is sent to its STDERR so we can't use open2 without doing 2>&1.
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359 | # On linux, 2>&1 launches a subshell which then launches wget, meaning that killing
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360 | # the childpid does not kill wget on Linux but the subshell that launched it instead.
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361 | # Therefore, we use open3. Though the child process wget sends output only to its stdout [is this meant to be "stderr"?],
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362 | # using open3 says chld_err is undefined and the output of wget only comes in chld_out(!)
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363 | # However that may be, it works with open3. But to avoid the confusion of managing and
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364 | # closing an extra unused handle, a single handle is used instead for both the child's
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365 | # stderr and stdout.
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366 | # See http://blog.0x1fff.com/2009/09/howto-execute-system-commands-in-perl.html
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367 | # for why this is the right thing to do.
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368 |
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369 | # Both open2 and open3 don't return on failure, but raise an exception. The handling
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370 | # of the exception is described on p.568 of the Perl Cookbook
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371 | eval {
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372 | #$childpid = open3($chld_in, $chld_out, $chld_out, $command);
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373 | $childpid = open3($chld_in, $chld_out, $chld_out, @commandargs);
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374 | };
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375 | if ($@) {
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376 | if($@ =~ m/^open3/) {
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377 | die "open3 failed in $0: $!\n$@\n";
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378 | }
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379 | die "Tried to launch open3 in $0, got unexpected exception: $@";
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380 | }
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381 |
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382 | # Switching to use IO::Select, which allows timeouts, instead of doing the potentially blocking
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383 | # if defined(my $strLine=<$chld_out>)
|
---|
384 | # Google: perl open3 read timeout
|
---|
385 | # Google: perl open3 select() example
|
---|
386 | # https://stackoverflow.com/questions/10029406/why-does-ipcopen3-get-deadlocked
|
---|
387 | # https://codereview.stackexchange.com/questions/84496/the-right-way-to-use-ipcopen3-in-perl
|
---|
388 | # https://gist.github.com/shalk/6988937
|
---|
389 | # https://stackoverflow.com/questions/18373500/how-to-check-if-command-executed-with-ipcopen3-is-hung
|
---|
390 | # http://perldoc.perl.org/IO/Select.html
|
---|
391 | # http://perldoc.perl.org/IPC/Open3.html - explains the need for select()/IO::Select with open3
|
---|
392 | # http://www.perlmonks.org/?node_id=951554
|
---|
393 | # http://search.cpan.org/~dmuey/IPC-Open3-Utils-0.91/lib/IPC/Open3/Utils.pm
|
---|
394 | # https://stackoverflow.com/questions/3000907/wget-not-behaving-via-ipcopen3-vs-bash?rq=1
|
---|
395 |
|
---|
396 | my $num_consecutive_timedouts = 0;
|
---|
397 | my $error = 0;
|
---|
398 | my $loop = 1;
|
---|
399 | my $size = 4096;
|
---|
400 | my $ALARM_EXCEPTION = "alarm wget timed out";
|
---|
401 |
|
---|
402 | while($loop)
|
---|
403 | {
|
---|
404 | my $strLine;
|
---|
405 | my $len = undef;
|
---|
406 |
|
---|
407 | # https://stackoverflow.com/questions/4517034/perl-set-read-timeout-in-client-socket
|
---|
408 | eval {
|
---|
409 | local $SIG{ALRM} = sub { die "$ALARM_EXCEPTION\n" }; # NB: \n required
|
---|
410 | alarm $TIMEOUT;
|
---|
411 | print STDERR "#### BEFORE sysread\n";
|
---|
412 | $len = sysread($chld_out, $strLine, $size);
|
---|
413 | print STDERR "#### AFTER sysread\n";
|
---|
414 | alarm 0;
|
---|
415 | };
|
---|
416 | if ($@ && $@ =~ m/$ALARM_EXCEPTION/) { #if ($@) { # if ($@ && $@ =~ m/$ALARM_EXCEPTION/) # http://perldoc.perl.org/perlipc.html#Signals
|
---|
417 | print STDERR "@@@@ GOT ALARM: timed out reading from child proc\n";
|
---|
418 | $num_consecutive_timedouts++;
|
---|
419 | }
|
---|
420 | else { # didn't timeout, so success reading from child process
|
---|
421 |
|
---|
422 | $num_consecutive_timedouts = 0; # re-zero, as we didn't timeout reading from child process after all
|
---|
423 | # since we're in this else statement
|
---|
424 |
|
---|
425 | if($len) { # read something
|
---|
426 | if($blnShow) {
|
---|
427 | print STDERR "$strLine\n";
|
---|
428 | }
|
---|
429 | $strReadIn .= $strLine;
|
---|
430 | }
|
---|
431 | else { # error or EOF: (!defined $len || $len == 0)
|
---|
432 |
|
---|
433 | if(!defined $len) { # error reading
|
---|
434 | print STDERR "WgetDownload: Error reading from child stream: $!\n";
|
---|
435 | # SHOULD THIS 'die "errmsg";' instead? - no, sockets may need closing
|
---|
436 | $error = 1;
|
---|
437 | }
|
---|
438 | elsif ($len == 0) { # EOF
|
---|
439 | # Finished reading from this filehand $fh because we read 0 bytes.
|
---|
440 | # wget finished, terminate naturally
|
---|
441 | print STDERR "WgetDownload: wget finished\n";
|
---|
442 | #print STDOUT "\nPerl: open3 command, input streams closed. Wget terminated naturally.\n";
|
---|
443 | }
|
---|
444 |
|
---|
445 | $loop = 0; # error or EOF, either way will need to clean up and break out of outer loop
|
---|
446 |
|
---|
447 | } # end else error or EOF
|
---|
448 |
|
---|
449 |
|
---|
450 | } # else on sysread succeeded vs alarm timeout
|
---|
451 |
|
---|
452 |
|
---|
453 | if($num_consecutive_timedouts >= $NUM_TRIES) {
|
---|
454 | $error = 1;
|
---|
455 | $loop = 0; # to break out of outer while loop
|
---|
456 |
|
---|
457 | $num_consecutive_timedouts = 0;
|
---|
458 |
|
---|
459 | print STDERR "WARNING from WgetDownload: wget timed out $NUM_TRIES times waiting for a response\n";
|
---|
460 | print STDERR "\tThe URL may be inaccessible or the proxy configuration is wrong or incomplete.\n";
|
---|
461 | #print STDERR "\tConsider cancelling this download?\n";
|
---|
462 | }
|
---|
463 |
|
---|
464 | if($loop == 0) { # error or EOF, either way, clean up
|
---|
465 | if($error) {
|
---|
466 | $self->{'forced_quit'} = 1; # subclasses need to know we're quitting
|
---|
467 |
|
---|
468 | if(kill(0, $childpid)) {
|
---|
469 | # If kill(0, $childpid) returns true, then the process is running
|
---|
470 | # and we need to kill it.
|
---|
471 | close($chld_in);
|
---|
472 | close($chld_out);
|
---|
473 | kill('TERM', $childpid); # kill the process group by prefixing - to signal
|
---|
474 |
|
---|
475 | # https://coderwall.com/p/q-ovnw/killing-all-child-processes-in-a-shell-script
|
---|
476 | # https://stackoverflow.com/questions/392022/best-way-to-kill-all-child-processes
|
---|
477 | print STDERR "SENT SIGTERM TO CHILD PID: $childpid\n";
|
---|
478 |
|
---|
479 | #die "Perl terminated wget after timing out repeatedly and is about to exit\n";
|
---|
480 | }
|
---|
481 | }
|
---|
482 | else { # wget finished (no errors), terminate naturally
|
---|
483 | #print STDOUT "\nPerl: open2 command, input stream closed. Wget terminated naturally.\n";
|
---|
484 | close($chld_in);
|
---|
485 | close($chld_out);
|
---|
486 | waitpid $childpid, 0;
|
---|
487 | }
|
---|
488 |
|
---|
489 | # error or not, loop out to be 0 now
|
---|
490 | $childpid = undef;
|
---|
491 | # Stop monitoring the read_handle and close the serverSocket
|
---|
492 | # (the Java end will close the client socket that Java opened)
|
---|
493 | if(defined $port) {
|
---|
494 | $read_set->remove($serverSocket);
|
---|
495 | close($serverSocket);
|
---|
496 | }
|
---|
497 | }
|
---|
498 |
|
---|
499 | # If we've already terminated, we can get out of the loop
|
---|
500 | next if($loop == 0);
|
---|
501 |
|
---|
502 | # Otherwise check for whether Java GLI attempted to connect to this perl script via socket
|
---|
503 |
|
---|
504 | # if we run this script from the command-line (as opposed to from GLI),
|
---|
505 | # then we're not working with sockets and can therefore skip the next bits
|
---|
506 | next unless(defined $port);
|
---|
507 |
|
---|
508 | # print STDERR "@@@ Now checking to see if GLI is connecting to perl socket...\n";
|
---|
509 |
|
---|
510 | # http://www.perlfect.com/articles/select.shtml
|
---|
511 | # "multiplex between several filehandles within a single thread of control,
|
---|
512 | # thus creating the effect of parallelism in the handling of I/O."
|
---|
513 | my @rh_set = $read_set->can_read(0.002); # every 2 ms check if there's a client socket connecting
|
---|
514 |
|
---|
515 | # take all readable handles in turn
|
---|
516 | foreach my $rh (@rh_set) {
|
---|
517 | if($rh == $serverSocket) {
|
---|
518 | my $client = $rh->accept();
|
---|
519 | #$client->autoflush(1); # autoflush output buffer - don't put this back in: output split irregularly over lines
|
---|
520 | print $client "Talked to ServerSocket (port $port). Connection accepted\n";
|
---|
521 |
|
---|
522 | # Read from the client (getting rid of the trailing newline)
|
---|
523 | # Has the client sent the <<STOP>> signal?
|
---|
524 | my $signal = <$client>;
|
---|
525 | chomp($signal);
|
---|
526 | if($signal eq "<<STOP>>") {
|
---|
527 | print $client "Perl received STOP signal (on port $port): stopping wget\n";
|
---|
528 | $loop = 0; # out of outer while loop
|
---|
529 | $self->{'forced_quit'} = 1; # subclasses need to know we're quitting
|
---|
530 |
|
---|
531 | # Sometimes the wget process takes some time to start up. If the STOP signal
|
---|
532 | # was sent, don't try to terminate the process until we know it is running.
|
---|
533 | # Otherwise wget may start running after we tried to kill it. Wait 5 seconds
|
---|
534 | # for it to start up, checking for whether it is running in order to kill it.
|
---|
535 | for(my $seconds = 1; $seconds <= 5; $seconds++) {
|
---|
536 | if(kill(0, $childpid)) {
|
---|
537 | # If kill(0, $childpid) returns true, then the process is running
|
---|
538 | # and we need to kill it.
|
---|
539 | close($chld_in);
|
---|
540 | close($chld_out);
|
---|
541 | kill("TERM", $childpid); # prefix - to signal to kill process group
|
---|
542 |
|
---|
543 | $childpid = undef;
|
---|
544 |
|
---|
545 | # Stop monitoring the read_handle and close the serverSocket
|
---|
546 | # (the Java end will close the client socket that Java opened)
|
---|
547 | $read_set->remove($rh); #$read_set->remove($serverSocket);
|
---|
548 | close($rh); #close($serverSocket);
|
---|
549 | print $client "Perl terminated wget and is about to exit\n";
|
---|
550 | last; # out of inner for loop
|
---|
551 | }
|
---|
552 | else { # the process may just be starting up, wait
|
---|
553 | sleep(1);
|
---|
554 | }
|
---|
555 | }
|
---|
556 | last; # out of inner for loop
|
---|
557 | }
|
---|
558 | }
|
---|
559 | }
|
---|
560 | } # end while($loop)
|
---|
561 |
|
---|
562 |
|
---|
563 | if ($changed_dir) {
|
---|
564 | chdir $current_dir;
|
---|
565 | }
|
---|
566 |
|
---|
567 | return $strReadIn;
|
---|
568 | }
|
---|
569 |
|
---|
570 |
|
---|
571 | sub useWgetMonitored
|
---|
572 | {
|
---|
573 | #local $| = 1; # autoflush stdout buffer
|
---|
574 | #print STDOUT "*** Start of subroutine useWgetMonitored in $0\n";
|
---|
575 |
|
---|
576 | my ($self, $cmdWget,$blnShow, $working_dir) = @_;
|
---|
577 |
|
---|
578 |
|
---|
579 | my $current_dir = cwd();
|
---|
580 | my $changed_dir = 0;
|
---|
581 | if (defined $working_dir && -e $working_dir) {
|
---|
582 | chdir "$working_dir";
|
---|
583 | $changed_dir = 1;
|
---|
584 | }
|
---|
585 |
|
---|
586 | # When we are running this script through GLI, the SIGTERM signal handler
|
---|
587 | # won't get called on Windows when wget is to be prematurely terminated.
|
---|
588 | # Instead, when wget has to be terminated in the middle of execution, GLI will
|
---|
589 | # connect to a serverSocket here to communicate when it's time to stop wget.
|
---|
590 | if($self->dealingWithSockets()) {
|
---|
591 |
|
---|
592 | $port = <STDIN>; # gets a port on localhost that's not yet in use
|
---|
593 | chomp($port);
|
---|
594 |
|
---|
595 | $serverSocket = IO::Socket::INET->new( Proto => 'tcp',
|
---|
596 | LocalPort => $port,
|
---|
597 | Listen => 1,
|
---|
598 | Reuse => 1);
|
---|
599 |
|
---|
600 | die "can't setup server" unless $serverSocket;
|
---|
601 | #print STDOUT "[Serversocket $0 accepting clients at port $port]\n";
|
---|
602 |
|
---|
603 | $read_set = new IO::Select(); # create handle set for reading
|
---|
604 | $read_set->add($serverSocket); # add the main socket to the set
|
---|
605 | }
|
---|
606 |
|
---|
607 | my $wget_file_path = &FileUtils::filenameConcatenate($ENV{'GSDLHOME'}, "bin", $ENV{'GSDLOS'}, "wget");
|
---|
608 | # compose the command as an array for open3, to preserve spaces in any filepath
|
---|
609 | my @commandargs = split(' ', $cmdWget);
|
---|
610 | unshift(@commandargs, $wget_file_path);
|
---|
611 | my $command = "$wget_file_path $cmdWget";
|
---|
612 | #print STDOUT "Command is: $command\n";
|
---|
613 |
|
---|
614 | eval { # see p.568 of Perl Cookbook
|
---|
615 | $childpid = open3($chld_in, $chld_out, $chld_out, @commandargs);
|
---|
616 | };
|
---|
617 | if ($@) {
|
---|
618 | if($@ =~ m/^open3/) {
|
---|
619 | die "open3 failed in $0: $!\n$@\n";
|
---|
620 | }
|
---|
621 | die "Tried to launch open3 in $0, got unexpected exception: $@";
|
---|
622 | }
|
---|
623 |
|
---|
624 | my $full_text = "";
|
---|
625 | my $error_text = "";
|
---|
626 | my @follow_list = ();
|
---|
627 | my $line;
|
---|
628 |
|
---|
629 | # create the select object and add our streamhandle(s)
|
---|
630 | my $sel = new IO::Select;
|
---|
631 | $sel->add($chld_out);
|
---|
632 |
|
---|
633 | my $num_consecutive_timedouts = 0;
|
---|
634 | my $error = 0;
|
---|
635 | my $loop = 1;
|
---|
636 | while($loop)
|
---|
637 | {
|
---|
638 | # assume we're going to timeout trying to read from child process
|
---|
639 | $num_consecutive_timedouts++;
|
---|
640 |
|
---|
641 | # block until data is available on the registered filehandles or until the timeout specified
|
---|
642 | if(my @readyhandles = $sel->can_read($TIMEOUT)) {
|
---|
643 | $num_consecutive_timedouts = 0; # re-zero, as we didn't timeout reading from child process after all
|
---|
644 | # since we're in this if statement
|
---|
645 |
|
---|
646 | foreach my $fh (@readyhandles) {
|
---|
647 | my $len = sysread($fh, $line, 4096); # read up to 4k from current ready filehandle
|
---|
648 | if($len) { # read something
|
---|
649 |
|
---|
650 |
|
---|
651 | if((defined $blnShow) && $blnShow)
|
---|
652 | {
|
---|
653 | print STDERR "$line";
|
---|
654 | }
|
---|
655 |
|
---|
656 | if ($line =~ m/^Location:\s*(.*?)\s*\[following\]\s*$/i) {
|
---|
657 | my $follow_url = $1;
|
---|
658 | push(@follow_list,$follow_url);
|
---|
659 | }
|
---|
660 |
|
---|
661 | if ($line =~ m/ERROR\s+\d+/) {
|
---|
662 | $error_text .= $line;
|
---|
663 | }
|
---|
664 |
|
---|
665 | $full_text .= $line;
|
---|
666 | } else { # error or EOF
|
---|
667 | if(!defined $len) { # error reading
|
---|
668 | #print STDERR "WgetDownload: Error reading from child stream: $!\n";
|
---|
669 | $error = 1;
|
---|
670 | }
|
---|
671 | elsif ($len == 0) { # EOF, finished with this filehandle because 0 bytes read
|
---|
672 | #print STDERR "WgetDownload: wget finished\n"; # wget terminated naturally
|
---|
673 | }
|
---|
674 |
|
---|
675 | $loop = 0; # error or EOF, either way will need to clean up and break out of outer loop
|
---|
676 |
|
---|
677 | # last; # if we have more than one filehandle registered with IO::Select
|
---|
678 |
|
---|
679 | $sel->remove($fh); # if more than one filehandle registered, we should unregister all of them here on error
|
---|
680 | } # end else error or EOF
|
---|
681 |
|
---|
682 | } # end foreach on readyhandles
|
---|
683 | } # end if on can_read
|
---|
684 |
|
---|
685 | if($num_consecutive_timedouts >= $NUM_TRIES) {
|
---|
686 | $error = 1;
|
---|
687 | $loop = 0; # to break out of outer while loop
|
---|
688 |
|
---|
689 | $num_consecutive_timedouts = 0;
|
---|
690 |
|
---|
691 | #print STDERR "WARNING from WgetDownload: wget timed out $NUM_TRIES times waiting for a response\n";
|
---|
692 | #print STDERR "\tThe URL may be inaccessible or the proxy configuration is wrong or incomplete.\n";
|
---|
693 | }
|
---|
694 |
|
---|
695 | if($loop == 0) { # error or EOF, either way, clean up
|
---|
696 |
|
---|
697 | if($error) {
|
---|
698 | $self->{'forced_quit'} = 1; # subclasses need to know we're quitting
|
---|
699 |
|
---|
700 | if(kill(0, $childpid)) {
|
---|
701 | # If kill(0, $childpid) returns true, then the process is running
|
---|
702 | # and we need to kill it.
|
---|
703 | close($chld_in);
|
---|
704 | close($chld_out);
|
---|
705 | kill("TERM", $childpid); # prefix - to signal to kill process group
|
---|
706 |
|
---|
707 | #die "Perl terminated wget after timing out repeatedly and is about to exit\n";
|
---|
708 | }
|
---|
709 | }
|
---|
710 | else { # wget finished, terminate naturally
|
---|
711 | close($chld_in);
|
---|
712 | close($chld_out);
|
---|
713 | # Program terminates only when the following line is included
|
---|
714 | # http://perldoc.perl.org/IPC/Open2.html explains why this is necessary
|
---|
715 | # it prevents the child from turning into a "zombie process".
|
---|
716 | # While the wget process terminates without it, this perl script does not:
|
---|
717 | # the DOS prompt is not returned without it.
|
---|
718 | waitpid $childpid, 0;
|
---|
719 | }
|
---|
720 |
|
---|
721 | # error or not:
|
---|
722 | $childpid = undef;
|
---|
723 | if(defined $port) {
|
---|
724 | $read_set->remove($serverSocket);
|
---|
725 | close($serverSocket);
|
---|
726 | }
|
---|
727 | }
|
---|
728 |
|
---|
729 | # if we run this script from the command-line (as opposed to from GLI),
|
---|
730 | # then we're not working with sockets and can therefore skip the next bits
|
---|
731 | next unless(defined $port);
|
---|
732 |
|
---|
733 | # http://www.perlfect.com/articles/select.shtml
|
---|
734 | # "multiplex between several filehandles within a single thread of control,
|
---|
735 | # thus creating the effect of parallelism in the handling of I/O."
|
---|
736 | my @rh_set = $read_set->can_read(0.002); # every 2 ms check if there's a client socket connecting
|
---|
737 |
|
---|
738 | # take all readable handles in turn
|
---|
739 | foreach my $rh (@rh_set) {
|
---|
740 | if($rh == $serverSocket) {
|
---|
741 | my $client = $rh->accept();
|
---|
742 | #$client->autoflush(1); # autoflush output buffer - don't put this back in: splits output irregularly over multilines
|
---|
743 | print $client "Talked to ServerSocket (port $port). Connection accepted\n";
|
---|
744 |
|
---|
745 | # Read from the client (getting rid of trailing newline)
|
---|
746 | # Has the client sent the <<STOP>> signal?
|
---|
747 | my $signal = <$client>;
|
---|
748 | chomp($signal);
|
---|
749 | if($signal eq "<<STOP>>") {
|
---|
750 | print $client "Perl received STOP signal (on port $port): stopping wget\n";
|
---|
751 | $loop = 0; # out of outer while loop
|
---|
752 | $self->{'forced_quit'} = 1; # subclasses need to know we're quitting
|
---|
753 |
|
---|
754 | # Sometimes the wget process takes some time to start up. If the STOP signal
|
---|
755 | # was sent, don't try to terminate the process until we know it is running.
|
---|
756 | # Otherwise wget may start running after we tried to kill it. Wait 5 seconds
|
---|
757 | # for it to start up, checking for whether it is running in order to kill it.
|
---|
758 | for(my $seconds = 1; $seconds <= 5; $seconds++) {
|
---|
759 | if(kill(0, $childpid)) {
|
---|
760 | # If kill(0, $childpid) returns true, then the process is running
|
---|
761 | # and we need to kill it.
|
---|
762 | close($chld_in);
|
---|
763 | close($chld_out);
|
---|
764 | kill("TERM", $childpid); # prefix - to signal to kill process group
|
---|
765 |
|
---|
766 | $childpid = undef;
|
---|
767 |
|
---|
768 | # Stop monitoring the read_handle and close the serverSocket
|
---|
769 | # (the Java end will close the client socket that Java opened)
|
---|
770 | $read_set->remove($rh); #$read_set->remove($serverSocket);
|
---|
771 | close($rh); #close($serverSocket);
|
---|
772 | print $client "Perl terminated wget and is about to exit\n";
|
---|
773 | last; # out of inner for loop
|
---|
774 | }
|
---|
775 | else { # the process may just be starting up, wait
|
---|
776 | sleep(1);
|
---|
777 | }
|
---|
778 | }
|
---|
779 | last; # out of foreach loop
|
---|
780 | }
|
---|
781 | }
|
---|
782 | }
|
---|
783 | }
|
---|
784 |
|
---|
785 | my $command_status = $?;
|
---|
786 | if ($command_status != 0) {
|
---|
787 | $error_text .= "Exit error: $command_status";
|
---|
788 | }
|
---|
789 |
|
---|
790 | if ($changed_dir) {
|
---|
791 | chdir $current_dir;
|
---|
792 | }
|
---|
793 |
|
---|
794 | my $final_follow = pop(@follow_list); # might be undefined, but that's OK
|
---|
795 |
|
---|
796 | return ($full_text,$error_text,$final_follow);
|
---|
797 | }
|
---|
798 |
|
---|
799 |
|
---|
800 | # TODO: Check if the URL is valid?? Not sure what should be in this function yet!!
|
---|
801 | sub checkURL
|
---|
802 | {
|
---|
803 | my ($self) = @_;
|
---|
804 | if ($self->{'url'} eq "")
|
---|
805 | {
|
---|
806 | &error("checkURL","no URL is specified!! Please specifies the URL for downloading.");
|
---|
807 | }
|
---|
808 | }
|
---|
809 |
|
---|
810 | sub error
|
---|
811 | {
|
---|
812 | my ($strFunctionName,$strError) = @_;
|
---|
813 | {
|
---|
814 | print "Error occoured in WgetDownload.pm\n".
|
---|
815 | "In Function:".$strFunctionName."\n".
|
---|
816 | "Error Message:".$strError."\n";
|
---|
817 | exit(-1);
|
---|
818 | }
|
---|
819 | }
|
---|
820 |
|
---|
821 | 1;
|
---|
822 |
|
---|