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package XAS::Lib::Lockmgr::Filesystem; |
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our $VERSION = '0.03'; |
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1152
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use DateTime; |
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use DateTime::Span; |
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use Try::Tiny::Retry ':all'; |
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use XAS::Constants 'TRUE FALSE HASHREF'; |
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use XAS::Class |
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version => $VERSION, |
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base => 'XAS::Base', |
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mixin => 'XAS::Lib::Mixins::Process XAS::Lib::Mixins::Handlers', |
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utils => 'dotid', |
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import => 'class', |
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filesystem => 'Dir File', |
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accessors => 'deadlock breaklock timeout attempts _lockfile _lockdir', |
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vars => { |
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PARAMS => { |
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-key => 1, |
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-args => { optional => 1, type => HASHREF, default => {} }, |
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} |
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} |
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1
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144
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; |
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#use Data::Dumper; |
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# ---------------------------------------------------------------------- |
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# Overrides |
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# ---------------------------------------------------------------------- |
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class('Badger::Filesystem')->methods( |
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directory_exists => sub { |
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0
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0
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my $self = shift; |
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0
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my $dir = shift; |
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0
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my $stats = $self->stat_path($dir) || return; |
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0
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return -d $dir ? $stats : 0; # don't use the cached stat |
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}, |
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file_exists => sub { |
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0
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my $self = shift; |
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0
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my $file = shift; |
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my $stats = $self->stat_path($file) || return; |
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return -f $file ? $stats : 0; # don't use the cached stat |
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} |
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); |
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# ---------------------------------------------------------------------- |
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# Public Methods |
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# ---------------------------------------------------------------------- |
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51
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sub lock { |
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0
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0
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1
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my $self = shift; |
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54
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0
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my $stat = FALSE; |
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0
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my $lock = $self->_lockfile(); |
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0
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my $dir = $self->_lockdir(); |
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58
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0
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$self->log->debug(sprintf('lock: %s', $dir)); |
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60
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retry { |
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62
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0
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0
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0
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if (($dir->exists) && ($lock->exists)) { |
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0
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63
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64
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0
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$stat = TRUE; |
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66
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} elsif ($dir->exists) { |
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68
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0
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0
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if ($stat = $self->_dead_lock()) { |
69
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70
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0
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$self->_make_lock(); |
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0
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$stat = TRUE; |
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73
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} |
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75
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} else { |
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77
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0
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$self->_make_lock(); |
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0
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$stat = TRUE; |
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80
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} |
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82
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} retry_if { |
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84
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0
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0
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my $ex = $_; |
85
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0
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my $exceptions = $self->exceptions; |
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87
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0
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0
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0
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if (ref($ex) && $ex->isa('Badger::Exception')) { |
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89
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0
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foreach my $exception (@$exceptions) { |
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91
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0
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0
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if ($ex->match_type($exception)) { |
92
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93
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0
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die $ex; |
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95
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} |
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97
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} |
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99
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} |
100
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101
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0
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$self->exception_handler($ex); |
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103
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0
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1; # always retry |
104
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105
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} delay { |
106
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107
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0
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0
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my $attempts = shift; |
108
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109
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0
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0
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return if ($attempts > $self->attempts); |
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0
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sleep int(rand($self->timeout)); |
111
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112
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} catch { |
113
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114
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0
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0
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my $ex = $_; |
115
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0
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0
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my $msg = (ref($ex) eq 'Badger::Exception') ? $ex->info : $ex; |
116
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117
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0
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$self->throw_msg( |
118
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dotid($self->class) . '.lock', |
119
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'lock_error', |
120
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$dir, $msg |
121
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); |
122
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123
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0
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}; |
124
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125
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0
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return $stat; |
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127
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} |
128
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129
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sub unlock { |
130
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0
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0
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1
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my $self = shift; |
131
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132
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0
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my $stat = FALSE; |
133
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0
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my $lock = $self->_lockfile(); |
134
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0
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my $dir = $self->_lockdir(); |
135
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136
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0
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$self->log->debug(sprintf('unlock: %s', $dir)); |
137
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138
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try { |
139
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140
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0
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0
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0
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$lock->delete if ($lock->exists); |
141
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0
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0
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$dir->delete if ($dir->exists); |
142
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0
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$stat = TRUE; |
143
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144
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} catch { |
145
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146
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0
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0
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my $ex = $_; |
147
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0
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0
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my $msg = (ref($ex) eq 'Badger::Exception') ? $ex->info : $ex; |
148
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149
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0
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$self->throw_msg( |
150
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dotid($self->class) . '.unlock', |
151
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'lock_error', |
152
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$dir, $msg |
153
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); |
154
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155
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0
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}; |
156
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157
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0
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return $stat; |
158
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159
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} |
160
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161
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sub try_lock { |
162
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0
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0
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1
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my $self = shift; |
163
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164
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0
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my $stat = TRUE; |
165
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0
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my $lock = $self->_lockfile(); |
166
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0
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my $dir = $self->_lockdir(); |
167
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168
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0
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$self->log->debug(sprintf('try_lock: %s', $dir)); |
169
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170
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try { |
171
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172
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0
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0
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0
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if ($dir->exists) { |
173
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174
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0
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$self->log->warn_msg('lock_dir_error', $dir); |
175
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0
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$stat = $self->_dead_lock(); |
176
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177
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} |
178
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179
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} catch { |
180
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181
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0
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0
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my $ex = $_; |
182
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0
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0
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my $msg = (ref($ex) eq 'Badger::Exception') ? $ex->info : $ex; |
183
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184
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0
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$self->throw_msg( |
185
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dotid($self->class) . '.unlock', |
186
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'lock_error', |
187
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$dir, $msg |
188
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); |
189
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190
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0
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}; |
191
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192
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0
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return $stat |
193
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194
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} |
195
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196
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sub exceptions { |
197
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0
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0
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1
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my $self = shift; |
198
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199
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0
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my $class = dotid($self->class); |
200
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0
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my @exceptions = [ |
201
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'filesystem', |
202
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$class, |
203
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]; |
204
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205
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0
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return \@exceptions; |
206
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207
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} |
208
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209
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sub destroy { |
210
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0
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0
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0
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my $self = shift; |
211
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212
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0
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my $lock = $self->_lockfile(); |
213
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0
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my $dir = $self->_lockdir(); |
214
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215
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try { # removes a potential warning during global destruction |
216
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217
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0
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0
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0
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$lock->delete if ($lock->exists); |
218
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0
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0
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$dir->delete if ($dir->exists); |
219
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220
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0
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}; |
221
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222
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0
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return 1; |
223
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224
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} |
225
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226
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sub DESTROY { |
227
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0
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0
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my $self = shift; |
228
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229
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0
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$self->destroy(); |
230
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231
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} |
232
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233
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|
# ---------------------------------------------------------------------- |
234
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# Private Methods |
235
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|
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|
|
# ---------------------------------------------------------------------- |
236
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237
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sub _make_lock { |
238
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0
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0
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my $self = shift; |
239
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240
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0
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my $lock = $self->_lockfile(); |
241
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0
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my $dir = $self->_lockdir(); |
242
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243
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0
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$self->log->debug(sprintf('_make_lock: %s', $dir)); |
244
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245
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# temporarily change the umask to create the |
246
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# directory and files with correct file permissions. |
247
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# this is a noop on windows. |
248
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249
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0
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my $omode = umask(0033); |
250
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0
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$dir->create; |
251
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0
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$lock->create; |
252
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0
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umask($omode); |
253
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254
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} |
255
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256
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sub _break_lock { |
257
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0
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0
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my $self = shift; |
258
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259
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0
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my $lock = $self->_lockfile(); |
260
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0
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my $dir = $self->_lockdir(); |
261
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262
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0
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$self->log->debug(sprintf('_break_lock: %s', $dir)); |
263
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264
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0
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0
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if ($dir->exists) { |
265
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266
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0
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foreach my $file (@{$dir->files}) { |
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0
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267
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268
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0
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0
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$file->delete if ($file->exists); |
269
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270
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} |
271
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272
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0
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0
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$dir->delete if ($dir->exists); |
273
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274
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} |
275
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276
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277
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} |
278
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279
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sub _whose_lock { |
280
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0
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0
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my $self = shift; |
281
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282
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0
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my $pid = undef; |
283
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0
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my $host = undef; |
284
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0
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|
my $time = undef; |
285
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0
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|
my $lock = $self->_lockfile(); |
286
|
0
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|
my $dir = $self->_lockdir(); |
287
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288
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0
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|
$self->log->debug(sprintf('_whose_lock: %s', $dir)); |
289
|
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|
290
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0
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0
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|
if ($dir->exists) { |
291
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292
|
0
|
0
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|
|
if (my @files = $dir->files) { |
293
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294
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# should only be one file in the directory, |
295
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|
# but that file may disappear before this |
296
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|
# check. |
297
|
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|
298
|
0
|
0
|
|
|
|
|
if ($files[0]->exists) { |
299
|
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|
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|
|
300
|
0
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|
|
$host = $files[0]->basename; |
301
|
0
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|
|
$pid = $files[0]->extension; |
302
|
0
|
|
|
|
|
|
$time = DateTime->from_epoch( |
303
|
|
|
|
|
|
|
epoch => ($files[0]->stat)[9], |
304
|
|
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|
time_zone => 'local' |
305
|
|
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|
); |
306
|
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|
307
|
|
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|
|
|
} |
308
|
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|
309
|
|
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|
|
} |
310
|
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311
|
|
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|
|
|
} |
312
|
|
|
|
|
|
|
|
313
|
0
|
|
|
|
|
|
return $host, $pid, $time; |
314
|
|
|
|
|
|
|
|
315
|
|
|
|
|
|
|
} |
316
|
|
|
|
|
|
|
|
317
|
|
|
|
|
|
|
sub _dead_lock { |
318
|
0
|
|
|
0
|
|
|
my $self = shift; |
319
|
|
|
|
|
|
|
|
320
|
0
|
|
|
|
|
|
my $stat = FALSE; |
321
|
0
|
|
|
|
|
|
my $lock = $self->_lockfile(); |
322
|
0
|
|
|
|
|
|
my $dir = $self->_lockdir(); |
323
|
0
|
|
|
|
|
|
my $now = DateTime->now(time_zone => 'local'); |
324
|
0
|
|
|
|
|
|
my ($host, $pid, $time) = $self->_whose_lock(); |
325
|
|
|
|
|
|
|
|
326
|
0
|
|
|
|
|
|
$self->log->debug(sprintf('_dead_lock: %s', $dir)); |
327
|
|
|
|
|
|
|
|
328
|
|
|
|
|
|
|
my $break_lock = sub { |
329
|
|
|
|
|
|
|
|
330
|
|
|
|
|
|
|
# break the deadlock, irregardless of who owns the lock |
331
|
|
|
|
|
|
|
|
332
|
0
|
|
|
0
|
|
|
$self->_break_lock(); |
333
|
0
|
|
|
|
|
|
$self->log->warn_msg('lock_broken', $dir); |
334
|
0
|
|
|
|
|
|
$stat = TRUE; |
335
|
|
|
|
|
|
|
|
336
|
0
|
|
|
|
|
|
}; |
337
|
|
|
|
|
|
|
|
338
|
0
|
0
|
0
|
|
|
|
if (defined($host) && defined($pid) && defined($time)) { |
|
|
|
0
|
|
|
|
|
339
|
|
|
|
|
|
|
|
340
|
0
|
|
|
|
|
|
$time->set_time_zone('local'); |
341
|
|
|
|
|
|
|
|
342
|
0
|
|
|
|
|
|
my $span = DateTime::Span->from_datetimes( |
343
|
|
|
|
|
|
|
start => $now->clone->subtract(seconds => $self->deadlock), |
344
|
|
|
|
|
|
|
end => $now->clone, |
345
|
|
|
|
|
|
|
); |
346
|
|
|
|
|
|
|
|
347
|
0
|
|
|
|
|
|
$self->log->debug(sprintf('_dead_lock: host - %s', $host)); |
348
|
0
|
|
|
|
|
|
$self->log->debug(sprintf('_dead_lock: pid - %s', $pid)); |
349
|
0
|
|
|
|
|
|
$self->log->debug(sprintf('_dead_lock: start - %s', $span->start)); |
350
|
0
|
|
|
|
|
|
$self->log->debug(sprintf('_dead_lock: lock - %s', $time)); |
351
|
0
|
|
|
|
|
|
$self->log->debug(sprintf('_dead_lock: end - %s', $span->end)); |
352
|
|
|
|
|
|
|
|
353
|
0
|
0
|
|
|
|
|
if ($span->contains($time)) { |
354
|
|
|
|
|
|
|
|
355
|
0
|
|
|
|
|
|
$self->log->debug('_dead_lock: within time span'); |
356
|
|
|
|
|
|
|
|
357
|
0
|
0
|
|
|
|
|
if ($host eq $self->env->host) { |
358
|
|
|
|
|
|
|
|
359
|
0
|
0
|
|
|
|
|
if ($pid == $$) { |
360
|
|
|
|
|
|
|
|
361
|
0
|
|
|
|
|
|
$self->log->debug('_dead_lock: our lock'); |
362
|
0
|
|
|
|
|
|
$stat = TRUE; |
363
|
|
|
|
|
|
|
|
364
|
|
|
|
|
|
|
} else { |
365
|
|
|
|
|
|
|
|
366
|
0
|
|
|
|
|
|
my $status = $self->proc_status($pid, '_dead_lock'); |
367
|
|
|
|
|
|
|
|
368
|
0
|
0
|
0
|
|
|
|
unless (($status == 3) || ($status == 2)) { |
369
|
|
|
|
|
|
|
|
370
|
0
|
|
|
|
|
|
$break_lock->(); |
371
|
|
|
|
|
|
|
|
372
|
|
|
|
|
|
|
} |
373
|
|
|
|
|
|
|
|
374
|
|
|
|
|
|
|
} |
375
|
|
|
|
|
|
|
|
376
|
|
|
|
|
|
|
} else { |
377
|
|
|
|
|
|
|
|
378
|
0
|
0
|
|
|
|
|
if ($self->breaklock) { |
379
|
|
|
|
|
|
|
|
380
|
0
|
|
|
|
|
|
$break_lock->(); |
381
|
|
|
|
|
|
|
|
382
|
|
|
|
|
|
|
} else { |
383
|
|
|
|
|
|
|
|
384
|
0
|
|
|
|
|
|
$self->throw_msg( |
385
|
|
|
|
|
|
|
dotid($self->class) . '.deadlock.remote', |
386
|
|
|
|
|
|
|
'lock_remote', |
387
|
|
|
|
|
|
|
$dir |
388
|
|
|
|
|
|
|
); |
389
|
|
|
|
|
|
|
|
390
|
|
|
|
|
|
|
} |
391
|
|
|
|
|
|
|
|
392
|
|
|
|
|
|
|
} |
393
|
|
|
|
|
|
|
|
394
|
|
|
|
|
|
|
} else { |
395
|
|
|
|
|
|
|
|
396
|
0
|
|
|
|
|
|
$break_lock->(); |
397
|
|
|
|
|
|
|
|
398
|
|
|
|
|
|
|
} |
399
|
|
|
|
|
|
|
|
400
|
|
|
|
|
|
|
} else { |
401
|
|
|
|
|
|
|
|
402
|
|
|
|
|
|
|
# unable to retrieve lock information, break the deadlock, |
403
|
|
|
|
|
|
|
# irregardless of who owns the lock |
404
|
|
|
|
|
|
|
|
405
|
0
|
|
|
|
|
|
$break_lock->(); |
406
|
|
|
|
|
|
|
|
407
|
|
|
|
|
|
|
} |
408
|
|
|
|
|
|
|
|
409
|
0
|
|
|
|
|
|
return $stat; |
410
|
|
|
|
|
|
|
|
411
|
|
|
|
|
|
|
} |
412
|
|
|
|
|
|
|
|
413
|
|
|
|
|
|
|
sub init { |
414
|
0
|
|
|
0
|
1
|
|
my $class = shift; |
415
|
|
|
|
|
|
|
|
416
|
0
|
|
|
|
|
|
my $self = $class->SUPER::init(@_); |
417
|
|
|
|
|
|
|
|
418
|
0
|
|
|
|
|
|
my $lockfile = $self->env->host . ".$$"; |
419
|
|
|
|
|
|
|
|
420
|
0
|
|
|
|
|
|
$self->{'_lockfile'} = File($self->key, $lockfile); |
421
|
0
|
|
|
|
|
|
$self->{'_lockdir'} = Dir($self->_lockfile->volume, $self->_lockfile->directory); |
422
|
|
|
|
|
|
|
|
423
|
|
|
|
|
|
|
$self->{'deadlock'} = defined($self->args->{'deadlock'}) |
424
|
0
|
0
|
|
|
|
|
? $self->args->{'deadlock'} |
425
|
|
|
|
|
|
|
: 1800; |
426
|
|
|
|
|
|
|
|
427
|
|
|
|
|
|
|
$self->{'breaklock'} = defined($self->args->{'breaklock'}) |
428
|
0
|
0
|
|
|
|
|
? $self->args->{'breaklock'} |
429
|
|
|
|
|
|
|
: 0; |
430
|
|
|
|
|
|
|
|
431
|
|
|
|
|
|
|
$self->{'timeout'} = defined($self->args->{'timeout'}) |
432
|
0
|
0
|
|
|
|
|
? $self->args->{'timeout'} |
433
|
|
|
|
|
|
|
: 30; |
434
|
|
|
|
|
|
|
|
435
|
|
|
|
|
|
|
$self->{'attempts'} = defined($self->args->{'attempts'}) |
436
|
0
|
0
|
|
|
|
|
? $self->args->{'attempts'} |
437
|
|
|
|
|
|
|
: 30; |
438
|
|
|
|
|
|
|
|
439
|
0
|
|
|
|
|
|
return $self; |
440
|
|
|
|
|
|
|
|
441
|
|
|
|
|
|
|
} |
442
|
|
|
|
|
|
|
|
443
|
|
|
|
|
|
|
1; |
444
|
|
|
|
|
|
|
|
445
|
|
|
|
|
|
|
__END__ |
446
|
|
|
|
|
|
|
|
447
|
|
|
|
|
|
|
=head1 NAME |
448
|
|
|
|
|
|
|
|
449
|
|
|
|
|
|
|
XAS::Lib::Lockmgr::Filsystem - Use the file system for locking. |
450
|
|
|
|
|
|
|
|
451
|
|
|
|
|
|
|
=head1 SYNOPSIS |
452
|
|
|
|
|
|
|
|
453
|
|
|
|
|
|
|
use XAS::Lib::Lockmgr; |
454
|
|
|
|
|
|
|
|
455
|
|
|
|
|
|
|
my $key = '/var/lock/wpm/alerts'; |
456
|
|
|
|
|
|
|
my $lockmgr = XAS::Lib::Lockmgr->new(); |
457
|
|
|
|
|
|
|
|
458
|
|
|
|
|
|
|
$lockmgr->add( |
459
|
|
|
|
|
|
|
-key => $key, |
460
|
|
|
|
|
|
|
-driver => 'Filesystem', |
461
|
|
|
|
|
|
|
-args => { |
462
|
|
|
|
|
|
|
timeout => 10, |
463
|
|
|
|
|
|
|
attempts => 10, |
464
|
|
|
|
|
|
|
breaklock => 1, |
465
|
|
|
|
|
|
|
deadlock => 900, |
466
|
|
|
|
|
|
|
} |
467
|
|
|
|
|
|
|
); |
468
|
|
|
|
|
|
|
|
469
|
|
|
|
|
|
|
if ($lockmgr->try_lock($key)) { |
470
|
|
|
|
|
|
|
|
471
|
|
|
|
|
|
|
$lockmgr->lock($key); |
472
|
|
|
|
|
|
|
|
473
|
|
|
|
|
|
|
... |
474
|
|
|
|
|
|
|
|
475
|
|
|
|
|
|
|
$lockmgr->unlock($key); |
476
|
|
|
|
|
|
|
|
477
|
|
|
|
|
|
|
} |
478
|
|
|
|
|
|
|
|
479
|
|
|
|
|
|
|
=head1 DESCRIPTION |
480
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481
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This class uses the manipulation of directories within the file system as a |
482
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mutex. This leverages the atomicity of creating directories and allows for |
483
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discretionary locking of resources. |
484
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485
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=head1 CONFIGURATION |
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487
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This module uses the following fields in -args. |
488
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489
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=over 4 |
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491
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=item B<attempts> |
492
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493
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The number of attempts to aquire the lock. The default is 30. |
494
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495
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=item B<timeout> |
496
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497
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The number of seconds to wait between lock attempts. The default is 30. |
498
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499
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=item B<deadlock> |
500
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501
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The number of seconds before a deadlock is declated, defaults to 1800, |
502
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503
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=item B<breaklock> |
504
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505
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Break the lock irregardless of how owns the lock, defaults to FALSE. |
506
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507
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=back |
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509
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=head1 METHODS |
510
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511
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=head2 lock |
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513
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Attempt to aquire a lock. This is done by creating a directory and writing |
514
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a status file into that directory. Returns TRUE for success, FALSE otherwise. |
515
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516
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=head2 unlock |
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518
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Remove the lock. This is done by removing the status file and then the |
519
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directory. Returns TRUE for success, FALSE otherwise. |
520
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521
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=head2 try_lock |
522
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523
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Check to see if a lock could be aquired. Returns FALSE if the directory exists, |
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TRUE otherwise. |
525
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526
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=head2 exceptions |
527
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528
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Returns the exceptions that you may not want to continue lock attemtps if |
529
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triggered. |
530
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531
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=head1 SEE ALSO |
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533
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=over 4 |
534
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535
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=item L<XAS::Lib::Lockmgr|XAS::Lib::Lockmgr> |
536
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537
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=item L<XAS|XAS> |
538
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539
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=back |
540
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541
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=head1 AUTHOR |
542
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543
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Kevin L. Esteb, E<lt>kevin@kesteb.usE<gt> |
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545
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=head1 COPYRIGHT AND LICENSE |
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547
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Copyright (c) 2012-2016 Kevin L. Esteb |
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549
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This is free software; you can redistribute it and/or modify it under |
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the terms of the Artistic License 2.0. For details, see the full text |
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of the license at http://www.perlfoundation.org/artistic_license_2_0. |
552
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553
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=cut |