Commit | Line | Data |
460b1067 |
1 | package DBM::Deep::File; |
2 | |
3 | use 5.6.0; |
4 | |
5 | use strict; |
6 | use warnings; |
7 | |
8 | use Fcntl qw( :DEFAULT :flock :seek ); |
9 | |
10 | our $VERSION = '0.01'; |
11 | |
12 | sub new { |
13 | my $class = shift; |
14 | my ($args) = @_; |
15 | |
16 | my $self = bless { |
359a01ac |
17 | audit_fh => undef, |
18 | audit_file => undef, |
19 | autobless => 1, |
460b1067 |
20 | autoflush => undef, |
21 | end => 0, |
22 | fh => undef, |
23 | file => undef, |
24 | file_offset => 0, |
25 | locking => undef, |
26 | locked => 0, |
27 | filter_store_key => undef, |
28 | filter_store_value => undef, |
29 | filter_fetch_key => undef, |
30 | filter_fetch_value => undef, |
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31 | |
359a01ac |
32 | # These are values that are not expected to be passed in through |
33 | # $args. They are here for documentation purposes. |
34 | transaction_id => 0, |
35 | transaction_offset => 0, |
36 | base_db_obj => undef, |
460b1067 |
37 | }, $class; |
38 | |
39 | # Grab the parameters we want to use |
40 | foreach my $param ( keys %$self ) { |
41 | next unless exists $args->{$param}; |
42 | $self->{$param} = $args->{$param}; |
43 | } |
44 | |
45 | if ( $self->{fh} && !$self->{file_offset} ) { |
46 | $self->{file_offset} = tell( $self->{fh} ); |
47 | } |
48 | |
49 | $self->open unless $self->{fh}; |
50 | |
359a01ac |
51 | if ( $self->{audit_file} && !$self->{audit_fh} ) { |
52 | my $flags = O_WRONLY | O_APPEND | O_CREAT; |
53 | |
54 | my $fh; |
55 | sysopen( $fh, $self->{audit_file}, $flags ) |
56 | or die "Cannot open audit file '$self->{audit_file}' for read/write: $!"; |
57 | |
58 | # Set the audit_fh to autoflush |
59 | my $old = select $fh; |
60 | $|=1; |
61 | select $old; |
62 | |
63 | $self->{audit_fh} = $fh; |
64 | } |
65 | |
66 | |
460b1067 |
67 | return $self; |
68 | } |
69 | |
359a01ac |
70 | sub set_db { |
71 | unless ( $_[0]{base_db_obj} ) { |
72 | $_[0]{base_db_obj} = $_[1]; |
73 | Scalar::Util::weaken( $_[0]{base_db_obj} ); |
74 | } |
75 | } |
76 | |
460b1067 |
77 | sub open { |
78 | my $self = shift; |
79 | |
80 | # Adding O_BINARY does remove the need for the binmode below. However, |
81 | # I'm not going to remove it because I don't have the Win32 chops to be |
82 | # absolutely certain everything will be ok. |
83 | my $flags = O_RDWR | O_CREAT | O_BINARY; |
84 | |
85 | my $fh; |
86 | sysopen( $fh, $self->{file}, $flags ) |
87 | or die "DBM::Deep: Cannot sysopen file '$self->{file}': $!\n"; |
88 | $self->{fh} = $fh; |
89 | |
90 | # Even though we use O_BINARY, better be safe than sorry. |
91 | binmode $fh; |
92 | |
93 | if ($self->{autoflush}) { |
94 | my $old = select $fh; |
95 | $|=1; |
96 | select $old; |
97 | } |
98 | |
99 | return 1; |
100 | } |
101 | |
102 | sub close { |
103 | my $self = shift; |
104 | |
105 | if ( $self->{fh} ) { |
106 | close $self->{fh}; |
107 | $self->{fh} = undef; |
108 | } |
109 | |
110 | return 1; |
111 | } |
112 | |
7dcefff3 |
113 | sub set_inode { |
114 | my $self = shift; |
115 | |
116 | unless ( $self->{inode} ) { |
117 | my @stats = stat($self->{fh}); |
118 | $self->{inode} = $stats[1]; |
119 | $self->{end} = $stats[7]; |
120 | } |
121 | |
122 | return 1; |
123 | } |
124 | |
019404df |
125 | sub print_at { |
126 | my $self = shift; |
127 | my $loc = shift; |
128 | |
129 | local ($/,$\); |
130 | |
131 | my $fh = $self->{fh}; |
7dcefff3 |
132 | if ( defined $loc ) { |
133 | seek( $fh, $loc + $self->{file_offset}, SEEK_SET ); |
134 | } |
135 | |
019404df |
136 | print( $fh @_ ); |
137 | |
138 | return 1; |
139 | } |
140 | |
7dcefff3 |
141 | sub read_at { |
142 | my $self = shift; |
143 | my ($loc, $size) = @_; |
144 | |
145 | local ($/,$\); |
146 | |
147 | my $fh = $self->{fh}; |
148 | if ( defined $loc ) { |
149 | seek( $fh, $loc + $self->{file_offset}, SEEK_SET ); |
150 | } |
151 | |
152 | my $buffer; |
153 | read( $fh, $buffer, $size); |
154 | |
155 | return $buffer; |
156 | } |
157 | |
158 | sub increment_pointer { |
159 | my $self = shift; |
160 | my ($size) = @_; |
161 | |
162 | if ( defined $size ) { |
163 | seek( $self->{fh}, $size, SEEK_CUR ); |
164 | } |
165 | |
166 | return 1; |
167 | } |
168 | |
460b1067 |
169 | sub DESTROY { |
170 | my $self = shift; |
171 | return unless $self; |
172 | |
173 | $self->close; |
174 | |
175 | return; |
176 | } |
177 | |
019404df |
178 | sub request_space { |
179 | my $self = shift; |
180 | my ($size) = @_; |
181 | |
7dcefff3 |
182 | #XXX Do I need to reset $self->{end} here? I need a testcase |
019404df |
183 | my $loc = $self->{end}; |
184 | $self->{end} += $size; |
185 | |
186 | return $loc; |
187 | } |
188 | |
189 | #sub release_space { |
190 | # my $self = shift; |
191 | # my ($size, $loc) = @_; |
192 | # |
193 | # local($/,$\); |
194 | # |
195 | # my $next_loc = 0; |
196 | # |
197 | # my $fh = $self->{fh}; |
198 | # seek( $fh, $loc + $self->{file_offset}, SEEK_SET ); |
199 | # print( $fh SIG_FREE |
200 | # . pack($self->{long_pack}, $size ) |
201 | # . pack($self->{long_pack}, $next_loc ) |
202 | # ); |
203 | # |
204 | # return; |
205 | #} |
206 | |
15ba72cc |
207 | ## |
208 | # If db locking is set, flock() the db file. If called multiple |
209 | # times before unlock(), then the same number of unlocks() must |
210 | # be called before the lock is released. |
211 | ## |
212 | sub lock { |
213 | my $self = shift; |
214 | my ($obj, $type) = @_; |
215 | $type = LOCK_EX unless defined $type; |
216 | |
217 | if (!defined($self->{fh})) { return; } |
218 | |
219 | if ($self->{locking}) { |
220 | if (!$self->{locked}) { |
221 | flock($self->{fh}, $type); |
222 | |
223 | # refresh end counter in case file has changed size |
224 | my @stats = stat($self->{fh}); |
225 | $self->{end} = $stats[7]; |
226 | |
227 | # double-check file inode, in case another process |
228 | # has optimize()d our file while we were waiting. |
229 | if ($stats[1] != $self->{inode}) { |
230 | $self->close; |
231 | $self->open; |
232 | |
233 | #XXX This needs work |
234 | $obj->{engine}->setup_fh( $obj ); |
235 | |
236 | flock($self->{fh}, $type); # re-lock |
237 | |
238 | # This may not be necessary after re-opening |
239 | $self->{end} = (stat($self->{fh}))[7]; # re-end |
240 | } |
241 | } |
242 | $self->{locked}++; |
243 | |
244 | return 1; |
245 | } |
246 | |
247 | return; |
248 | } |
249 | |
250 | ## |
251 | # If db locking is set, unlock the db file. See note in lock() |
252 | # regarding calling lock() multiple times. |
253 | ## |
254 | sub unlock { |
255 | my $self = shift; |
256 | |
257 | if (!defined($self->{fh})) { return; } |
258 | |
259 | if ($self->{locking} && $self->{locked} > 0) { |
260 | $self->{locked}--; |
261 | if (!$self->{locked}) { flock($self->{fh}, LOCK_UN); } |
262 | |
263 | return 1; |
264 | } |
265 | |
266 | return; |
267 | } |
268 | |
269 | sub set_transaction_offset { |
270 | my $self = shift; |
271 | $self->{transaction_offset} = shift; |
272 | } |
273 | |
aa83bc1e |
274 | sub audit { |
275 | my $self = shift; |
276 | |
277 | if ( my $afh = $self->{audit_fh} ) { |
278 | my ($string) = @_; |
279 | |
280 | flock( $afh, LOCK_EX ); |
281 | |
282 | if ( $string =~ /^#/ ) { |
283 | print( $afh "$string " . localtime(time) . "\n" ); |
284 | } |
285 | else { |
286 | print( $afh "$string # " . localtime(time) . "\n" ); |
287 | } |
288 | |
289 | flock( $afh, LOCK_UN ); |
290 | } |
291 | |
292 | return 1; |
293 | } |
294 | |
28394a1a |
295 | sub begin_transaction { |
296 | my $self = shift; |
297 | |
15ba72cc |
298 | my $fh = $self->{fh}; |
299 | |
20b7f047 |
300 | $self->lock; |
301 | |
aa83bc1e |
302 | seek( $fh, $self->{transaction_offset} + $self->{file_offset}, SEEK_SET ); |
20b7f047 |
303 | my $buffer; |
304 | read( $fh, $buffer, 4 ); |
305 | $buffer = unpack( 'N', $buffer ); |
306 | |
307 | for ( 1 .. 32 ) { |
308 | next if $buffer & (1 << ($_ - 1)); |
309 | $self->{transaction_id} = $_; |
c9b6d0d8 |
310 | $buffer |= (1 << $_-1 ); |
20b7f047 |
311 | last; |
312 | } |
313 | |
aa83bc1e |
314 | seek( $fh, $self->{transaction_offset} + $self->{file_offset}, SEEK_SET ); |
20b7f047 |
315 | print( $fh pack( 'N', $buffer ) ); |
15ba72cc |
316 | |
20b7f047 |
317 | $self->unlock; |
318 | |
319 | return $self->{transaction_id}; |
28394a1a |
320 | } |
321 | |
322 | sub end_transaction { |
323 | my $self = shift; |
324 | |
20b7f047 |
325 | my $fh = $self->{fh}; |
326 | |
327 | $self->lock; |
328 | |
aa83bc1e |
329 | seek( $fh, $self->{transaction_offset} + $self->{file_offset}, SEEK_SET ); |
20b7f047 |
330 | my $buffer; |
331 | read( $fh, $buffer, 4 ); |
332 | $buffer = unpack( 'N', $buffer ); |
333 | |
334 | # Unset $self->{transaction_id} bit |
335 | |
aa83bc1e |
336 | seek( $fh, $self->{transaction_offset} + $self->{file_offset}, SEEK_SET ); |
20b7f047 |
337 | print( $fh pack( 'N', $buffer ) ); |
338 | |
339 | $self->unlock; |
15ba72cc |
340 | |
28394a1a |
341 | $self->{transaction_id} = 0; |
342 | } |
343 | |
20b7f047 |
344 | sub current_transactions { |
28394a1a |
345 | my $self = shift; |
346 | |
20b7f047 |
347 | my $fh = $self->{fh}; |
348 | |
349 | $self->lock; |
350 | |
aa83bc1e |
351 | seek( $fh, $self->{transaction_offset} + $self->{file_offset}, SEEK_SET ); |
20b7f047 |
352 | my $buffer; |
353 | read( $fh, $buffer, 4 ); |
354 | $buffer = unpack( 'N', $buffer ); |
355 | |
356 | $self->unlock; |
357 | |
358 | my @transactions; |
359 | for ( 1 .. 32 ) { |
360 | if ( $buffer & (1 << ($_ - 1)) ) { |
361 | push @transactions, $_; |
362 | } |
363 | } |
364 | |
c9b6d0d8 |
365 | return grep { $_ != $self->{transaction_id} } @transactions; |
28394a1a |
366 | } |
367 | |
20b7f047 |
368 | sub transaction_id { return $_[0]->{transaction_id} } |
369 | |
28394a1a |
370 | #sub commit { |
371 | #} |
372 | |
460b1067 |
373 | 1; |
374 | __END__ |
375 | |