Commit | Line | Data |
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1 | package DBM::Deep::File; |
2 | |
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3 | use 5.006_000; |
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4 | |
5 | use strict; |
6 | use warnings; |
7 | |
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8 | our $VERSION = q(1.0004); |
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9 | |
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10 | use Fcntl qw( :DEFAULT :flock :seek ); |
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11 | |
12 | sub new { |
13 | my $class = shift; |
14 | my ($args) = @_; |
15 | |
16 | my $self = bless { |
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17 | autobless => 1, |
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18 | autoflush => 1, |
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19 | end => 0, |
20 | fh => undef, |
21 | file => undef, |
22 | file_offset => 0, |
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23 | locking => 1, |
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24 | locked => 0, |
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25 | #XXX Migrate this to the engine, where it really belongs. |
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26 | filter_store_key => undef, |
27 | filter_store_value => undef, |
28 | filter_fetch_key => undef, |
29 | filter_fetch_value => undef, |
30 | }, $class; |
31 | |
32 | # Grab the parameters we want to use |
33 | foreach my $param ( keys %$self ) { |
34 | next unless exists $args->{$param}; |
35 | $self->{$param} = $args->{$param}; |
36 | } |
37 | |
38 | if ( $self->{fh} && !$self->{file_offset} ) { |
39 | $self->{file_offset} = tell( $self->{fh} ); |
40 | } |
41 | |
42 | $self->open unless $self->{fh}; |
43 | |
44 | return $self; |
45 | } |
46 | |
47 | sub open { |
48 | my $self = shift; |
49 | |
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50 | # Adding O_BINARY should remove the need for the binmode below. However, |
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51 | # I'm not going to remove it because I don't have the Win32 chops to be |
52 | # absolutely certain everything will be ok. |
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53 | my $flags = O_CREAT | O_BINARY; |
54 | |
55 | if ( !-e $self->{file} || -w _ ) { |
56 | $flags |= O_RDWR; |
57 | } |
58 | else { |
59 | $flags |= O_RDONLY; |
60 | } |
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61 | |
62 | my $fh; |
63 | sysopen( $fh, $self->{file}, $flags ) |
64 | or die "DBM::Deep: Cannot sysopen file '$self->{file}': $!\n"; |
65 | $self->{fh} = $fh; |
66 | |
67 | # Even though we use O_BINARY, better be safe than sorry. |
68 | binmode $fh; |
69 | |
70 | if ($self->{autoflush}) { |
71 | my $old = select $fh; |
72 | $|=1; |
73 | select $old; |
74 | } |
75 | |
76 | return 1; |
77 | } |
78 | |
79 | sub close { |
80 | my $self = shift; |
81 | |
82 | if ( $self->{fh} ) { |
83 | close $self->{fh}; |
84 | $self->{fh} = undef; |
85 | } |
86 | |
87 | return 1; |
88 | } |
89 | |
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90 | sub set_inode { |
91 | my $self = shift; |
92 | |
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93 | unless ( defined $self->{inode} ) { |
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94 | my @stats = stat($self->{fh}); |
95 | $self->{inode} = $stats[1]; |
96 | $self->{end} = $stats[7]; |
97 | } |
98 | |
99 | return 1; |
100 | } |
101 | |
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102 | sub print_at { |
103 | my $self = shift; |
104 | my $loc = shift; |
105 | |
106 | local ($/,$\); |
107 | |
108 | my $fh = $self->{fh}; |
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109 | if ( defined $loc ) { |
110 | seek( $fh, $loc + $self->{file_offset}, SEEK_SET ); |
111 | } |
112 | |
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113 | print( $fh @_ ); |
114 | |
115 | return 1; |
116 | } |
117 | |
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118 | sub read_at { |
119 | my $self = shift; |
120 | my ($loc, $size) = @_; |
121 | |
122 | local ($/,$\); |
123 | |
124 | my $fh = $self->{fh}; |
125 | if ( defined $loc ) { |
126 | seek( $fh, $loc + $self->{file_offset}, SEEK_SET ); |
127 | } |
128 | |
129 | my $buffer; |
130 | read( $fh, $buffer, $size); |
131 | |
132 | return $buffer; |
133 | } |
134 | |
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135 | sub DESTROY { |
136 | my $self = shift; |
137 | return unless $self; |
138 | |
139 | $self->close; |
140 | |
141 | return; |
142 | } |
143 | |
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144 | sub request_space { |
145 | my $self = shift; |
146 | my ($size) = @_; |
147 | |
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148 | #XXX Do I need to reset $self->{end} here? I need a testcase |
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149 | my $loc = $self->{end}; |
150 | $self->{end} += $size; |
151 | |
152 | return $loc; |
153 | } |
154 | |
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155 | ## |
156 | # If db locking is set, flock() the db file. If called multiple |
157 | # times before unlock(), then the same number of unlocks() must |
158 | # be called before the lock is released. |
159 | ## |
160 | sub lock { |
161 | my $self = shift; |
162 | my ($obj, $type) = @_; |
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163 | |
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164 | $type = LOCK_EX unless defined $type; |
165 | |
166 | if (!defined($self->{fh})) { return; } |
167 | |
168 | if ($self->{locking}) { |
169 | if (!$self->{locked}) { |
170 | flock($self->{fh}, $type); |
171 | |
172 | # refresh end counter in case file has changed size |
173 | my @stats = stat($self->{fh}); |
174 | $self->{end} = $stats[7]; |
175 | |
176 | # double-check file inode, in case another process |
177 | # has optimize()d our file while we were waiting. |
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178 | if (defined($self->{inode}) && $stats[1] != $self->{inode}) { |
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179 | $self->close; |
180 | $self->open; |
181 | |
182 | #XXX This needs work |
183 | $obj->{engine}->setup_fh( $obj ); |
184 | |
185 | flock($self->{fh}, $type); # re-lock |
186 | |
187 | # This may not be necessary after re-opening |
188 | $self->{end} = (stat($self->{fh}))[7]; # re-end |
189 | } |
190 | } |
191 | $self->{locked}++; |
192 | |
193 | return 1; |
194 | } |
195 | |
196 | return; |
197 | } |
198 | |
199 | ## |
200 | # If db locking is set, unlock the db file. See note in lock() |
201 | # regarding calling lock() multiple times. |
202 | ## |
203 | sub unlock { |
204 | my $self = shift; |
205 | |
206 | if (!defined($self->{fh})) { return; } |
207 | |
208 | if ($self->{locking} && $self->{locked} > 0) { |
209 | $self->{locked}--; |
210 | if (!$self->{locked}) { flock($self->{fh}, LOCK_UN); } |
211 | |
212 | return 1; |
213 | } |
214 | |
215 | return; |
216 | } |
217 | |
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218 | sub flush { |
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219 | my $self = shift; |
220 | |
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221 | # Flush the filehandle |
222 | my $old_fh = select $self->{fh}; |
223 | my $old_af = $|; $| = 1; $| = $old_af; |
224 | select $old_fh; |
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225 | |
226 | return 1; |
227 | } |
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228 | |
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229 | 1; |
230 | __END__ |