Commit | Line | Data |
a20d9a3f |
1 | package DBM::Deep::Engine; |
2 | |
460b1067 |
3 | use 5.6.0; |
4 | |
a20d9a3f |
5 | use strict; |
460b1067 |
6 | use warnings; |
a20d9a3f |
7 | |
8 | use Fcntl qw( :DEFAULT :flock :seek ); |
359a01ac |
9 | use Scalar::Util (); |
a20d9a3f |
10 | |
21838116 |
11 | # File-wide notes: |
12 | # * All the local($/,$\); are to protect read() and print() from -l. |
20b7f047 |
13 | # * To add to bucket_size, make sure you modify the following: |
14 | # - calculate_sizes() |
15 | # - _get_key_subloc() |
16 | # - add_bucket() - where the buckets are printed |
21838116 |
17 | |
8db25060 |
18 | ## |
19 | # Setup file and tag signatures. These should never change. |
20 | ## |
21 | sub SIG_FILE () { 'DPDB' } |
460b1067 |
22 | sub SIG_HEADER () { 'h' } |
8db25060 |
23 | sub SIG_INTERNAL () { 'i' } |
24 | sub SIG_HASH () { 'H' } |
25 | sub SIG_ARRAY () { 'A' } |
8db25060 |
26 | sub SIG_NULL () { 'N' } |
27 | sub SIG_DATA () { 'D' } |
28 | sub SIG_INDEX () { 'I' } |
29 | sub SIG_BLIST () { 'B' } |
7b1e1aa1 |
30 | sub SIG_FREE () { 'F' } |
8db25060 |
31 | sub SIG_SIZE () { 1 } |
32 | |
612969fb |
33 | sub new { |
34 | my $class = shift; |
35 | my ($args) = @_; |
36 | |
37 | my $self = bless { |
38 | long_size => 4, |
39 | long_pack => 'N', |
40 | data_size => 4, |
41 | data_pack => 'N', |
251dfd0e |
42 | |
612969fb |
43 | digest => \&Digest::MD5::md5, |
44 | hash_size => 16, |
251dfd0e |
45 | |
81d16922 |
46 | ## |
d5d7c51d |
47 | # Maximum number of buckets per list before another level of indexing is |
e0098e7f |
48 | # done. Increase this value for slightly greater speed, but larger database |
d5d7c51d |
49 | # files. DO NOT decrease this value below 16, due to risk of recursive |
50 | # reindex overrun. |
81d16922 |
51 | ## |
612969fb |
52 | max_buckets => 16, |
460b1067 |
53 | |
54 | fileobj => undef, |
359a01ac |
55 | obj => undef, |
612969fb |
56 | }, $class; |
57 | |
e0098e7f |
58 | if ( defined $args->{pack_size} ) { |
59 | if ( lc $args->{pack_size} eq 'small' ) { |
60 | $args->{long_size} = 2; |
c9b6d0d8 |
61 | $args->{long_pack} = 'n'; |
e0098e7f |
62 | } |
63 | elsif ( lc $args->{pack_size} eq 'medium' ) { |
64 | $args->{long_size} = 4; |
65 | $args->{long_pack} = 'N'; |
66 | } |
67 | elsif ( lc $args->{pack_size} eq 'large' ) { |
68 | $args->{long_size} = 8; |
69 | $args->{long_pack} = 'Q'; |
70 | } |
71 | else { |
72 | die "Unknown pack_size value: '$args->{pack_size}'\n"; |
73 | } |
74 | } |
75 | |
fde3db1a |
76 | # Grab the parameters we want to use |
77 | foreach my $param ( keys %$self ) { |
78 | next unless exists $args->{$param}; |
3e9498a1 |
79 | $self->{$param} = $args->{$param}; |
fde3db1a |
80 | } |
359a01ac |
81 | Scalar::Util::weaken( $self->{obj} ) if $self->{obj}; |
fde3db1a |
82 | |
e0098e7f |
83 | if ( $self->{max_buckets} < 16 ) { |
84 | warn "Floor of max_buckets is 16. Setting it to 16 from '$self->{max_buckets}'\n"; |
85 | $self->{max_buckets} = 16; |
86 | } |
87 | |
260a80b4 |
88 | return $self; |
89 | } |
90 | |
460b1067 |
91 | sub _fileobj { return $_[0]{fileobj} } |
92 | sub _fh { return $_[0]->_fileobj->{fh} } |
93 | |
260a80b4 |
94 | sub calculate_sizes { |
95 | my $self = shift; |
96 | |
28394a1a |
97 | #XXX Does this need to be updated with different hashing algorithms? |
e0098e7f |
98 | $self->{index_size} = (2**8) * $self->{long_size}; |
28394a1a |
99 | $self->{bucket_size} = $self->{hash_size} + $self->{long_size} * 3; |
e0098e7f |
100 | $self->{bucket_list_size} = $self->{max_buckets} * $self->{bucket_size}; |
612969fb |
101 | |
260a80b4 |
102 | return; |
1bf65be7 |
103 | } |
104 | |
fde3db1a |
105 | sub write_file_header { |
0d0f3d5d |
106 | my $self = shift; |
0d0f3d5d |
107 | |
21838116 |
108 | local($/,$\); |
109 | |
460b1067 |
110 | my $fh = $self->_fh; |
0d0f3d5d |
111 | |
e96daec8 |
112 | my $loc = $self->_request_space( length( SIG_FILE ) + 21 ); |
460b1067 |
113 | seek($fh, $loc + $self->_fileobj->{file_offset}, SEEK_SET); |
260a80b4 |
114 | print( $fh |
115 | SIG_FILE, |
460b1067 |
116 | SIG_HEADER, |
117 | pack('N', 1), # header version |
118 | pack('N', 12), # header size |
15ba72cc |
119 | pack('N', 0), # currently running transaction IDs |
c9b6d0d8 |
120 | pack('n', $self->{long_size}), |
260a80b4 |
121 | pack('A', $self->{long_pack}), |
c9b6d0d8 |
122 | pack('n', $self->{data_size}), |
260a80b4 |
123 | pack('A', $self->{data_pack}), |
c9b6d0d8 |
124 | pack('n', $self->{max_buckets}), |
260a80b4 |
125 | ); |
0d0f3d5d |
126 | |
20b7f047 |
127 | $self->_fileobj->set_transaction_offset( 13 ); |
128 | |
0d0f3d5d |
129 | return; |
130 | } |
131 | |
fde3db1a |
132 | sub read_file_header { |
e064ccd1 |
133 | my $self = shift; |
e064ccd1 |
134 | |
21838116 |
135 | local($/,$\); |
136 | |
e96daec8 |
137 | my $fh = $self->_fh; |
e064ccd1 |
138 | |
e96daec8 |
139 | seek($fh, 0 + $self->_fileobj->{file_offset}, SEEK_SET); |
42f79e07 |
140 | my $buffer; |
460b1067 |
141 | my $bytes_read = read( $fh, $buffer, length(SIG_FILE) + 9 ); |
142 | |
143 | return unless $bytes_read; |
144 | |
145 | my ($file_signature, $sig_header, $header_version, $size) = unpack( |
146 | 'A4 A N N', $buffer |
42f79e07 |
147 | ); |
e064ccd1 |
148 | |
460b1067 |
149 | unless ( $file_signature eq SIG_FILE ) { |
15ba72cc |
150 | $self->_fileobj->close; |
e96daec8 |
151 | $self->_throw_error( "Signature not found -- file is not a Deep DB" ); |
460b1067 |
152 | } |
260a80b4 |
153 | |
460b1067 |
154 | unless ( $sig_header eq SIG_HEADER ) { |
15ba72cc |
155 | $self->_fileobj->close; |
e96daec8 |
156 | $self->_throw_error( "Old file version found." ); |
460b1067 |
157 | } |
9b2370e0 |
158 | |
460b1067 |
159 | my $buffer2; |
160 | $bytes_read += read( $fh, $buffer2, $size ); |
c9b6d0d8 |
161 | my ($running_transactions, @values) = unpack( 'N n A n A n', $buffer2 ); |
15ba72cc |
162 | |
163 | $self->_fileobj->set_transaction_offset( 13 ); |
164 | |
460b1067 |
165 | if ( @values < 5 || grep { !defined } @values ) { |
15ba72cc |
166 | $self->_fileobj->close; |
e96daec8 |
167 | $self->_throw_error("Corrupted file - bad header"); |
e064ccd1 |
168 | } |
169 | |
460b1067 |
170 | #XXX Add warnings if values weren't set right |
171 | @{$self}{qw(long_size long_pack data_size data_pack max_buckets)} = @values; |
172 | |
e064ccd1 |
173 | return $bytes_read; |
174 | } |
175 | |
460b1067 |
176 | sub setup_fh { |
177 | my $self = shift; |
178 | my ($obj) = @_; |
70b55428 |
179 | |
359a01ac |
180 | local($/,$\); |
181 | |
e96daec8 |
182 | my $fh = $self->_fh; |
6fde4ed2 |
183 | flock $fh, LOCK_EX; |
118ba343 |
184 | |
260a80b4 |
185 | #XXX The duplication of calculate_sizes needs to go away |
6fde4ed2 |
186 | unless ( $obj->{base_offset} ) { |
e96daec8 |
187 | my $bytes_read = $self->read_file_header; |
118ba343 |
188 | |
260a80b4 |
189 | $self->calculate_sizes; |
190 | |
118ba343 |
191 | ## |
fde3db1a |
192 | # File is empty -- write header and master index |
118ba343 |
193 | ## |
194 | if (!$bytes_read) { |
aa83bc1e |
195 | $self->_fileobj->audit( "# Database created on" ); |
359a01ac |
196 | |
e96daec8 |
197 | $self->write_file_header; |
118ba343 |
198 | |
e96daec8 |
199 | $obj->{base_offset} = $self->_request_space( $self->tag_size( $self->{index_size} ) ); |
118ba343 |
200 | |
9e4f83a0 |
201 | $self->write_tag( |
e96daec8 |
202 | $obj->_base_offset, $obj->_type, |
f37c15ab |
203 | chr(0)x$self->{index_size}, |
118ba343 |
204 | ); |
205 | |
206 | # Flush the filehandle |
207 | my $old_fh = select $fh; |
208 | my $old_af = $|; $| = 1; $| = $old_af; |
209 | select $old_fh; |
210 | } |
211 | else { |
212 | $obj->{base_offset} = $bytes_read; |
213 | |
214 | ## |
fde3db1a |
215 | # Get our type from master index header |
118ba343 |
216 | ## |
359a01ac |
217 | my $tag = $self->load_tag($obj->_base_offset); |
218 | unless ( $tag ) { |
219 | flock $fh, LOCK_UN; |
220 | $self->_throw_error("Corrupted file, no master index record"); |
221 | } |
118ba343 |
222 | |
e96daec8 |
223 | unless ($obj->_type eq $tag->{signature}) { |
359a01ac |
224 | flock $fh, LOCK_UN; |
e96daec8 |
225 | $self->_throw_error("File type mismatch"); |
118ba343 |
226 | } |
227 | } |
118ba343 |
228 | } |
260a80b4 |
229 | else { |
230 | $self->calculate_sizes; |
231 | } |
e06824f8 |
232 | |
673464d9 |
233 | #XXX We have to make sure we don't mess up when autoflush isn't turned on |
e96daec8 |
234 | unless ( $self->_fileobj->{inode} ) { |
235 | my @stats = stat($fh); |
236 | $self->_fileobj->{inode} = $stats[1]; |
237 | $self->_fileobj->{end} = $stats[7]; |
70b55428 |
238 | } |
239 | |
6fde4ed2 |
240 | flock $fh, LOCK_UN; |
241 | |
70b55428 |
242 | return 1; |
243 | } |
244 | |
16d1ad9b |
245 | sub tag_size { |
246 | my $self = shift; |
247 | my ($size) = @_; |
248 | return SIG_SIZE + $self->{data_size} + $size; |
249 | } |
250 | |
9e4f83a0 |
251 | sub write_tag { |
20f7b20c |
252 | ## |
253 | # Given offset, signature and content, create tag and write to disk |
254 | ## |
d4b1166e |
255 | my $self = shift; |
e96daec8 |
256 | my ($offset, $sig, $content) = @_; |
f37c15ab |
257 | my $size = length( $content ); |
20f7b20c |
258 | |
21838116 |
259 | local($/,$\); |
260 | |
e96daec8 |
261 | my $fh = $self->_fh; |
d4b1166e |
262 | |
f37c15ab |
263 | if ( defined $offset ) { |
e96daec8 |
264 | seek($fh, $offset + $self->_fileobj->{file_offset}, SEEK_SET); |
f37c15ab |
265 | } |
266 | |
251dfd0e |
267 | print( $fh $sig . pack($self->{data_pack}, $size) . $content ); |
20f7b20c |
268 | |
f37c15ab |
269 | return unless defined $offset; |
270 | |
20f7b20c |
271 | return { |
272 | signature => $sig, |
273 | size => $size, |
8db25060 |
274 | offset => $offset + SIG_SIZE + $self->{data_size}, |
20f7b20c |
275 | content => $content |
276 | }; |
d4b1166e |
277 | } |
278 | |
279 | sub load_tag { |
20f7b20c |
280 | ## |
281 | # Given offset, load single tag and return signature, size and data |
282 | ## |
d4b1166e |
283 | my $self = shift; |
e96daec8 |
284 | my ($offset) = @_; |
20f7b20c |
285 | |
21838116 |
286 | local($/,$\); |
287 | |
e06824f8 |
288 | # print join(':',map{$_||''}caller(1)), $/; |
289 | |
e96daec8 |
290 | my $fh = $self->_fh; |
d4b1166e |
291 | |
e96daec8 |
292 | seek($fh, $offset + $self->_fileobj->{file_offset}, SEEK_SET); |
e5fc7e69 |
293 | |
75be6413 |
294 | #XXX I'm not sure this check will work if autoflush isn't enabled ... |
e5fc7e69 |
295 | return if eof $fh; |
20f7b20c |
296 | |
d4b1166e |
297 | my $b; |
8db25060 |
298 | read( $fh, $b, SIG_SIZE + $self->{data_size} ); |
251dfd0e |
299 | my ($sig, $size) = unpack( "A $self->{data_pack}", $b ); |
20f7b20c |
300 | |
301 | my $buffer; |
302 | read( $fh, $buffer, $size); |
303 | |
304 | return { |
305 | signature => $sig, |
306 | size => $size, |
8db25060 |
307 | offset => $offset + SIG_SIZE + $self->{data_size}, |
20f7b20c |
308 | content => $buffer |
309 | }; |
d4b1166e |
310 | } |
311 | |
56ec4340 |
312 | sub _get_dbm_object { |
313 | my $item = shift; |
314 | |
315 | my $obj = eval { |
316 | local $SIG{__DIE__}; |
317 | if ($item->isa( 'DBM::Deep' )) { |
318 | return $item; |
319 | } |
320 | return; |
321 | }; |
322 | return $obj if $obj; |
323 | |
324 | my $r = Scalar::Util::reftype( $item ) || ''; |
325 | if ( $r eq 'HASH' ) { |
326 | my $obj = eval { |
327 | local $SIG{__DIE__}; |
328 | my $obj = tied(%$item); |
329 | if ($obj->isa( 'DBM::Deep' )) { |
330 | return $obj; |
331 | } |
332 | return; |
333 | }; |
334 | return $obj if $obj; |
335 | } |
336 | elsif ( $r eq 'ARRAY' ) { |
337 | my $obj = eval { |
338 | local $SIG{__DIE__}; |
339 | my $obj = tied(@$item); |
340 | if ($obj->isa( 'DBM::Deep' )) { |
341 | return $obj; |
342 | } |
343 | return; |
344 | }; |
345 | return $obj if $obj; |
346 | } |
347 | |
348 | return; |
349 | } |
350 | |
29b01632 |
351 | sub _length_needed { |
352 | my $self = shift; |
e96daec8 |
353 | my ($value, $key) = @_; |
29b01632 |
354 | |
355 | my $is_dbm_deep = eval { |
356 | local $SIG{'__DIE__'}; |
357 | $value->isa( 'DBM::Deep' ); |
358 | }; |
359 | |
f37c15ab |
360 | my $len = SIG_SIZE + $self->{data_size} |
361 | + $self->{data_size} + length( $key ); |
29b01632 |
362 | |
e96daec8 |
363 | if ( $is_dbm_deep && $value->_fileobj eq $self->_fileobj ) { |
f37c15ab |
364 | return $len + $self->{long_size}; |
29b01632 |
365 | } |
366 | |
367 | my $r = Scalar::Util::reftype( $value ) || ''; |
e96daec8 |
368 | if ( $self->_fileobj->{autobless} ) { |
9a187d8c |
369 | # This is for the bit saying whether or not this thing is blessed. |
370 | $len += 1; |
371 | } |
372 | |
29b01632 |
373 | unless ( $r eq 'HASH' || $r eq 'ARRAY' ) { |
f37c15ab |
374 | if ( defined $value ) { |
375 | $len += length( $value ); |
376 | } |
377 | return $len; |
29b01632 |
378 | } |
379 | |
f37c15ab |
380 | $len += $self->{index_size}; |
29b01632 |
381 | |
382 | # if autobless is enabled, must also take into consideration |
f37c15ab |
383 | # the class name as it is stored after the key. |
e96daec8 |
384 | if ( $self->_fileobj->{autobless} ) { |
56ec4340 |
385 | my $c = Scalar::Util::blessed($value); |
386 | if ( defined $c && !$is_dbm_deep ) { |
387 | $len += $self->{data_size} + length($c); |
29b01632 |
388 | } |
389 | } |
390 | |
f37c15ab |
391 | return $len; |
29b01632 |
392 | } |
393 | |
20f7b20c |
394 | sub add_bucket { |
395 | ## |
396 | # Adds one key/value pair to bucket list, given offset, MD5 digest of key, |
397 | # plain (undigested) key and value. |
398 | ## |
d4b1166e |
399 | my $self = shift; |
359a01ac |
400 | my ($tag, $md5, $plain_key, $value, $deleted, $orig_key) = @_; |
c9b6d0d8 |
401 | $deleted ||= 0; |
75be6413 |
402 | |
21838116 |
403 | local($/,$\); |
404 | |
eea0d863 |
405 | # This verifies that only supported values will be stored. |
406 | { |
407 | my $r = Scalar::Util::reftype( $value ); |
408 | last if !defined $r; |
409 | |
410 | last if $r eq 'HASH'; |
411 | last if $r eq 'ARRAY'; |
412 | |
e96daec8 |
413 | $self->_throw_error( |
eea0d863 |
414 | "Storage of variables of type '$r' is not supported." |
415 | ); |
416 | } |
417 | |
20f7b20c |
418 | my $location = 0; |
419 | my $result = 2; |
420 | |
e96daec8 |
421 | my $root = $self->_fileobj; |
422 | my $fh = $self->_fh; |
20f7b20c |
423 | |
e96daec8 |
424 | my $actual_length = $self->_length_needed( $value, $plain_key ); |
20f7b20c |
425 | |
21838116 |
426 | #ACID - This is a mutation. Must only find the exact transaction |
c9b6d0d8 |
427 | my ($subloc, $offset, $size,$is_deleted) = $self->_find_in_buckets( $tag, $md5, 1 ); |
428 | |
429 | my @transactions; |
430 | if ( $self->_fileobj->transaction_id == 0 ) { |
431 | @transactions = $self->_fileobj->current_transactions; |
432 | } |
75be6413 |
433 | |
e96daec8 |
434 | # $self->_release_space( $size, $subloc ); |
386bab6c |
435 | # Updating a known md5 |
f9c33187 |
436 | #XXX This needs updating to use _release_space |
386bab6c |
437 | if ( $subloc ) { |
438 | $result = 1; |
20f7b20c |
439 | |
386bab6c |
440 | if ($actual_length <= $size) { |
441 | $location = $subloc; |
20f7b20c |
442 | } |
75be6413 |
443 | else { |
e96daec8 |
444 | $location = $self->_request_space( $actual_length ); |
386bab6c |
445 | seek( |
446 | $fh, |
9a187d8c |
447 | $tag->{offset} + $offset |
448 | + $self->{hash_size} + $root->{file_offset}, |
386bab6c |
449 | SEEK_SET, |
450 | ); |
9a187d8c |
451 | print( $fh pack($self->{long_pack}, $location ) ); |
452 | print( $fh pack($self->{long_pack}, $actual_length ) ); |
c9b6d0d8 |
453 | print( $fh pack('n n', $root->transaction_id, $deleted ) ); |
75be6413 |
454 | } |
75be6413 |
455 | } |
386bab6c |
456 | # Adding a new md5 |
457 | elsif ( defined $offset ) { |
e96daec8 |
458 | $location = $self->_request_space( $actual_length ); |
386bab6c |
459 | |
460 | seek( $fh, $tag->{offset} + $offset + $root->{file_offset}, SEEK_SET ); |
9a187d8c |
461 | print( $fh $md5 . pack($self->{long_pack}, $location ) ); |
462 | print( $fh pack($self->{long_pack}, $actual_length ) ); |
c9b6d0d8 |
463 | print( $fh pack('n n', $root->transaction_id, $deleted ) ); |
464 | |
465 | for ( @transactions ) { |
466 | my $tag2 = $self->load_tag( $tag->{offset} - SIG_SIZE - $self->{data_size} ); |
467 | $self->_fileobj->{transaction_id} = $_; |
359a01ac |
468 | $self->add_bucket( $tag2, $md5, '', '', 1, $orig_key ); |
c9b6d0d8 |
469 | $self->_fileobj->{transaction_id} = 0; |
470 | } |
386bab6c |
471 | } |
472 | # If bucket didn't fit into list, split into a new index level |
f9c33187 |
473 | # split_index() will do the _request_space() call |
386bab6c |
474 | else { |
e96daec8 |
475 | $location = $self->split_index( $md5, $tag ); |
386bab6c |
476 | } |
20f7b20c |
477 | |
359a01ac |
478 | $self->write_value( $location, $plain_key, $value, $orig_key ); |
d5d7c51d |
479 | |
480 | return $result; |
481 | } |
482 | |
483 | sub write_value { |
484 | my $self = shift; |
359a01ac |
485 | my ($location, $key, $value, $orig_key) = @_; |
d5d7c51d |
486 | |
21838116 |
487 | local($/,$\); |
488 | |
e96daec8 |
489 | my $fh = $self->_fh; |
490 | my $root = $self->_fileobj; |
d5d7c51d |
491 | |
9d4fa373 |
492 | my $dbm_deep_obj = _get_dbm_object( $value ); |
e96daec8 |
493 | if ( $dbm_deep_obj && $dbm_deep_obj->_fileobj ne $self->_fileobj ) { |
494 | $self->_throw_error( "Cannot cross-reference. Use export() instead" ); |
9d4fa373 |
495 | } |
d5d7c51d |
496 | |
497 | seek($fh, $location + $root->{file_offset}, SEEK_SET); |
498 | |
20f7b20c |
499 | ## |
d5d7c51d |
500 | # Write signature based on content type, set content length and write |
501 | # actual value. |
20f7b20c |
502 | ## |
9d4fa373 |
503 | my $r = Scalar::Util::reftype( $value ) || ''; |
504 | if ( $dbm_deep_obj ) { |
e96daec8 |
505 | $self->write_tag( undef, SIG_INTERNAL,pack($self->{long_pack}, $dbm_deep_obj->_base_offset) ); |
f37c15ab |
506 | } |
507 | elsif ($r eq 'HASH') { |
9d4fa373 |
508 | if ( !$dbm_deep_obj && tied %{$value} ) { |
e96daec8 |
509 | $self->_throw_error( "Cannot store something that is tied" ); |
019ab3a1 |
510 | } |
e96daec8 |
511 | $self->write_tag( undef, SIG_HASH, chr(0)x$self->{index_size} ); |
f37c15ab |
512 | } |
513 | elsif ($r eq 'ARRAY') { |
9d4fa373 |
514 | if ( !$dbm_deep_obj && tied @{$value} ) { |
e96daec8 |
515 | $self->_throw_error( "Cannot store something that is tied" ); |
019ab3a1 |
516 | } |
e96daec8 |
517 | $self->write_tag( undef, SIG_ARRAY, chr(0)x$self->{index_size} ); |
f37c15ab |
518 | } |
519 | elsif (!defined($value)) { |
e96daec8 |
520 | $self->write_tag( undef, SIG_NULL, '' ); |
d5d7c51d |
521 | } |
522 | else { |
e96daec8 |
523 | $self->write_tag( undef, SIG_DATA, $value ); |
d5d7c51d |
524 | } |
20f7b20c |
525 | |
d5d7c51d |
526 | ## |
527 | # Plain key is stored AFTER value, as keys are typically fetched less often. |
528 | ## |
529 | print( $fh pack($self->{data_pack}, length($key)) . $key ); |
20f7b20c |
530 | |
9a187d8c |
531 | # Internal references don't care about autobless |
9d4fa373 |
532 | return 1 if $dbm_deep_obj; |
9a187d8c |
533 | |
d5d7c51d |
534 | ## |
535 | # If value is blessed, preserve class name |
536 | ## |
537 | if ( $root->{autobless} ) { |
56ec4340 |
538 | my $c = Scalar::Util::blessed($value); |
539 | if ( defined $c && !$dbm_deep_obj ) { |
d5d7c51d |
540 | print( $fh chr(1) ); |
56ec4340 |
541 | print( $fh pack($self->{data_pack}, length($c)) . $c ); |
20f7b20c |
542 | } |
d5d7c51d |
543 | else { |
544 | print( $fh chr(0) ); |
20f7b20c |
545 | } |
d5d7c51d |
546 | } |
20f7b20c |
547 | |
d5d7c51d |
548 | ## |
56ec4340 |
549 | # Tie the passed in reference so that changes to it are reflected in the |
550 | # datafile. The use of $location as the base_offset will act as the |
551 | # the linkage between parent and child. |
552 | # |
553 | # The overall assignment is a hack around the fact that just tying doesn't |
554 | # store the values. This may not be the wrong thing to do. |
d5d7c51d |
555 | ## |
9d4fa373 |
556 | if ($r eq 'HASH') { |
557 | my %x = %$value; |
558 | tie %$value, 'DBM::Deep', { |
559 | base_offset => $location, |
460b1067 |
560 | fileobj => $root, |
359a01ac |
561 | parent => $self->{obj}, |
562 | parent_key => $orig_key, |
9d4fa373 |
563 | }; |
564 | %$value = %x; |
565 | } |
566 | elsif ($r eq 'ARRAY') { |
567 | my @x = @$value; |
568 | tie @$value, 'DBM::Deep', { |
569 | base_offset => $location, |
460b1067 |
570 | fileobj => $root, |
359a01ac |
571 | parent => $self->{obj}, |
572 | parent_key => $orig_key, |
9d4fa373 |
573 | }; |
574 | @$value = @x; |
20f7b20c |
575 | } |
d4b1166e |
576 | |
d5d7c51d |
577 | return 1; |
d4b1166e |
578 | } |
579 | |
75be6413 |
580 | sub split_index { |
581 | my $self = shift; |
e96daec8 |
582 | my ($md5, $tag) = @_; |
75be6413 |
583 | |
21838116 |
584 | local($/,$\); |
585 | |
e96daec8 |
586 | my $fh = $self->_fh; |
587 | my $root = $self->_fileobj; |
16d1ad9b |
588 | |
589 | my $loc = $self->_request_space( |
e96daec8 |
590 | $self->tag_size( $self->{index_size} ), |
16d1ad9b |
591 | ); |
592 | |
7b1e1aa1 |
593 | seek($fh, $tag->{ref_loc} + $root->{file_offset}, SEEK_SET); |
16d1ad9b |
594 | print( $fh pack($self->{long_pack}, $loc) ); |
75be6413 |
595 | |
9e4f83a0 |
596 | my $index_tag = $self->write_tag( |
e96daec8 |
597 | $loc, SIG_INDEX, |
f37c15ab |
598 | chr(0)x$self->{index_size}, |
75be6413 |
599 | ); |
600 | |
f9c33187 |
601 | my $newtag_loc = $self->_request_space( |
e96daec8 |
602 | $self->tag_size( $self->{bucket_list_size} ), |
f9c33187 |
603 | ); |
75be6413 |
604 | |
7b1e1aa1 |
605 | my $keys = $tag->{content} |
f9c33187 |
606 | . $md5 . pack($self->{long_pack}, $newtag_loc) |
28394a1a |
607 | . pack($self->{long_pack}, 0) # size |
20b7f047 |
608 | . pack($self->{long_pack}, 0); # transaction ID |
75be6413 |
609 | |
f9c33187 |
610 | my @newloc = (); |
75be6413 |
611 | BUCKET: |
612 | for (my $i = 0; $i <= $self->{max_buckets}; $i++) { |
9a187d8c |
613 | my ($key, $old_subloc, $size) = $self->_get_key_subloc( $keys, $i ); |
75be6413 |
614 | |
f9c33187 |
615 | die "[INTERNAL ERROR]: No key in split_index()\n" unless $key; |
616 | die "[INTERNAL ERROR]: No subloc in split_index()\n" unless $old_subloc; |
75be6413 |
617 | |
75be6413 |
618 | my $num = ord(substr($key, $tag->{ch} + 1, 1)); |
619 | |
f9c33187 |
620 | if ($newloc[$num]) { |
621 | seek($fh, $newloc[$num] + $root->{file_offset}, SEEK_SET); |
75be6413 |
622 | my $subkeys; |
623 | read( $fh, $subkeys, $self->{bucket_list_size}); |
624 | |
f9c33187 |
625 | # This is looking for the first empty spot |
7b1e1aa1 |
626 | my ($subloc, $offset, $size) = $self->_find_in_buckets( |
f9c33187 |
627 | { content => $subkeys }, '', |
7b1e1aa1 |
628 | ); |
75be6413 |
629 | |
f9c33187 |
630 | seek($fh, $newloc[$num] + $offset + $root->{file_offset}, SEEK_SET); |
631 | print( $fh $key . pack($self->{long_pack}, $old_subloc) ); |
7b1e1aa1 |
632 | |
633 | next; |
75be6413 |
634 | } |
75be6413 |
635 | |
7b1e1aa1 |
636 | seek($fh, $index_tag->{offset} + ($num * $self->{long_size}) + $root->{file_offset}, SEEK_SET); |
2603d86e |
637 | |
7b1e1aa1 |
638 | my $loc = $self->_request_space( |
e96daec8 |
639 | $self->tag_size( $self->{bucket_list_size} ), |
7b1e1aa1 |
640 | ); |
2603d86e |
641 | |
7b1e1aa1 |
642 | print( $fh pack($self->{long_pack}, $loc) ); |
75be6413 |
643 | |
7b1e1aa1 |
644 | my $blist_tag = $self->write_tag( |
e96daec8 |
645 | $loc, SIG_BLIST, |
7b1e1aa1 |
646 | chr(0)x$self->{bucket_list_size}, |
647 | ); |
648 | |
649 | seek($fh, $blist_tag->{offset} + $root->{file_offset}, SEEK_SET); |
f9c33187 |
650 | print( $fh $key . pack($self->{long_pack}, $old_subloc) ); |
7b1e1aa1 |
651 | |
f9c33187 |
652 | $newloc[$num] = $blist_tag->{offset}; |
7b1e1aa1 |
653 | } |
654 | |
655 | $self->_release_space( |
e96daec8 |
656 | $self->tag_size( $self->{bucket_list_size} ), |
7b1e1aa1 |
657 | $tag->{offset} - SIG_SIZE - $self->{data_size}, |
658 | ); |
75be6413 |
659 | |
f9c33187 |
660 | return $newtag_loc; |
75be6413 |
661 | } |
662 | |
8db25060 |
663 | sub read_from_loc { |
664 | my $self = shift; |
359a01ac |
665 | my ($subloc, $orig_key) = @_; |
8db25060 |
666 | |
21838116 |
667 | local($/,$\); |
668 | |
e96daec8 |
669 | my $fh = $self->_fh; |
8db25060 |
670 | |
671 | ## |
672 | # Found match -- seek to offset and read signature |
673 | ## |
674 | my $signature; |
e96daec8 |
675 | seek($fh, $subloc + $self->_fileobj->{file_offset}, SEEK_SET); |
8db25060 |
676 | read( $fh, $signature, SIG_SIZE); |
677 | |
678 | ## |
679 | # If value is a hash or array, return new DBM::Deep object with correct offset |
680 | ## |
681 | if (($signature eq SIG_HASH) || ($signature eq SIG_ARRAY)) { |
685e40f1 |
682 | my $new_obj = DBM::Deep->new({ |
359a01ac |
683 | type => $signature, |
8db25060 |
684 | base_offset => $subloc, |
e96daec8 |
685 | fileobj => $self->_fileobj, |
359a01ac |
686 | parent => $self->{obj}, |
687 | parent_key => $orig_key, |
685e40f1 |
688 | }); |
8db25060 |
689 | |
460b1067 |
690 | if ($new_obj->_fileobj->{autobless}) { |
8db25060 |
691 | ## |
692 | # Skip over value and plain key to see if object needs |
693 | # to be re-blessed |
694 | ## |
695 | seek($fh, $self->{data_size} + $self->{index_size}, SEEK_CUR); |
696 | |
697 | my $size; |
c6ea6b6c |
698 | read( $fh, $size, $self->{data_size}); |
699 | $size = unpack($self->{data_pack}, $size); |
8db25060 |
700 | if ($size) { seek($fh, $size, SEEK_CUR); } |
701 | |
702 | my $bless_bit; |
703 | read( $fh, $bless_bit, 1); |
704 | if (ord($bless_bit)) { |
705 | ## |
706 | # Yes, object needs to be re-blessed |
707 | ## |
708 | my $class_name; |
c6ea6b6c |
709 | read( $fh, $size, $self->{data_size}); |
710 | $size = unpack($self->{data_pack}, $size); |
8db25060 |
711 | if ($size) { read( $fh, $class_name, $size); } |
685e40f1 |
712 | if ($class_name) { $new_obj = bless( $new_obj, $class_name ); } |
8db25060 |
713 | } |
714 | } |
715 | |
685e40f1 |
716 | return $new_obj; |
8db25060 |
717 | } |
718 | elsif ( $signature eq SIG_INTERNAL ) { |
719 | my $size; |
720 | read( $fh, $size, $self->{data_size}); |
721 | $size = unpack($self->{data_pack}, $size); |
722 | |
723 | if ( $size ) { |
724 | my $new_loc; |
725 | read( $fh, $new_loc, $size ); |
726 | $new_loc = unpack( $self->{long_pack}, $new_loc ); |
727 | |
359a01ac |
728 | return $self->read_from_loc( $new_loc, $orig_key ); |
8db25060 |
729 | } |
730 | else { |
731 | return; |
732 | } |
733 | } |
734 | ## |
735 | # Otherwise return actual value |
736 | ## |
460b1067 |
737 | elsif ( $signature eq SIG_DATA ) { |
8db25060 |
738 | my $size; |
739 | read( $fh, $size, $self->{data_size}); |
740 | $size = unpack($self->{data_pack}, $size); |
741 | |
742 | my $value = ''; |
743 | if ($size) { read( $fh, $value, $size); } |
744 | return $value; |
745 | } |
746 | |
747 | ## |
748 | # Key exists, but content is null |
749 | ## |
750 | return; |
751 | } |
752 | |
9020ee8c |
753 | sub get_bucket_value { |
beac1dff |
754 | ## |
755 | # Fetch single value given tag and MD5 digested key. |
756 | ## |
757 | my $self = shift; |
359a01ac |
758 | my ($tag, $md5, $orig_key) = @_; |
9020ee8c |
759 | |
21838116 |
760 | #ACID - This is a read. Can find exact or HEAD |
c9b6d0d8 |
761 | my ($subloc, $offset, $size,$is_deleted) = $self->_find_in_buckets( $tag, $md5 ); |
762 | if ( $subloc && !$is_deleted ) { |
359a01ac |
763 | return $self->read_from_loc( $subloc, $orig_key ); |
386bab6c |
764 | } |
beac1dff |
765 | return; |
9020ee8c |
766 | } |
ab0e4957 |
767 | |
768 | sub delete_bucket { |
beac1dff |
769 | ## |
770 | # Delete single key/value pair given tag and MD5 digested key. |
771 | ## |
772 | my $self = shift; |
a97c8f67 |
773 | my ($tag, $md5, $orig_key) = @_; |
ab0e4957 |
774 | |
21838116 |
775 | local($/,$\); |
776 | |
777 | #ACID - This is a mutation. Must only find the exact transaction |
778 | my ($subloc, $offset, $size) = $self->_find_in_buckets( $tag, $md5, 1 ); |
f9c33187 |
779 | #XXX This needs _release_space() |
386bab6c |
780 | if ( $subloc ) { |
e96daec8 |
781 | my $fh = $self->_fh; |
782 | seek($fh, $tag->{offset} + $offset + $self->_fileobj->{file_offset}, SEEK_SET); |
386bab6c |
783 | print( $fh substr($tag->{content}, $offset + $self->{bucket_size} ) ); |
251dfd0e |
784 | print( $fh chr(0) x $self->{bucket_size} ); |
d0b74c17 |
785 | |
ab0e4957 |
786 | return 1; |
386bab6c |
787 | } |
beac1dff |
788 | return; |
ab0e4957 |
789 | } |
790 | |
912d50b1 |
791 | sub bucket_exists { |
beac1dff |
792 | ## |
793 | # Check existence of single key given tag and MD5 digested key. |
794 | ## |
795 | my $self = shift; |
e96daec8 |
796 | my ($tag, $md5) = @_; |
912d50b1 |
797 | |
21838116 |
798 | #ACID - This is a read. Can find exact or HEAD |
c9b6d0d8 |
799 | my ($subloc, $offset, $size, $is_deleted) = $self->_find_in_buckets( $tag, $md5 ); |
800 | return ($subloc && !$is_deleted) && 1; |
912d50b1 |
801 | } |
802 | |
6736c116 |
803 | sub find_bucket_list { |
beac1dff |
804 | ## |
805 | # Locate offset for bucket list, given digested key |
806 | ## |
807 | my $self = shift; |
e96daec8 |
808 | my ($offset, $md5, $args) = @_; |
d0b74c17 |
809 | $args = {} unless $args; |
810 | |
21838116 |
811 | local($/,$\); |
812 | |
beac1dff |
813 | ## |
814 | # Locate offset for bucket list using digest index system |
815 | ## |
e96daec8 |
816 | my $tag = $self->load_tag( $offset ) |
817 | or $self->_throw_error( "INTERNAL ERROR - Cannot find tag" ); |
d0b74c17 |
818 | |
e5fc7e69 |
819 | my $ch = 0; |
8db25060 |
820 | while ($tag->{signature} ne SIG_BLIST) { |
d0b74c17 |
821 | my $num = ord substr($md5, $ch, 1); |
822 | |
823 | my $ref_loc = $tag->{offset} + ($num * $self->{long_size}); |
e96daec8 |
824 | $tag = $self->index_lookup( $tag, $num ); |
d0b74c17 |
825 | |
826 | if (!$tag) { |
29b01632 |
827 | return if !$args->{create}; |
d0b74c17 |
828 | |
16d1ad9b |
829 | my $loc = $self->_request_space( |
e96daec8 |
830 | $self->tag_size( $self->{bucket_list_size} ), |
16d1ad9b |
831 | ); |
832 | |
e96daec8 |
833 | my $fh = $self->_fh; |
834 | seek($fh, $ref_loc + $self->_fileobj->{file_offset}, SEEK_SET); |
16d1ad9b |
835 | print( $fh pack($self->{long_pack}, $loc) ); |
d0b74c17 |
836 | |
9e4f83a0 |
837 | $tag = $self->write_tag( |
e96daec8 |
838 | $loc, SIG_BLIST, |
f37c15ab |
839 | chr(0)x$self->{bucket_list_size}, |
d5d7c51d |
840 | ); |
841 | |
842 | $tag->{ref_loc} = $ref_loc; |
843 | $tag->{ch} = $ch; |
844 | |
845 | last; |
d0b74c17 |
846 | } |
847 | |
16d1ad9b |
848 | $tag->{ch} = $ch++; |
d0b74c17 |
849 | $tag->{ref_loc} = $ref_loc; |
beac1dff |
850 | } |
d0b74c17 |
851 | |
beac1dff |
852 | return $tag; |
6736c116 |
853 | } |
854 | |
d0b74c17 |
855 | sub index_lookup { |
856 | ## |
857 | # Given index tag, lookup single entry in index and return . |
858 | ## |
859 | my $self = shift; |
e96daec8 |
860 | my ($tag, $index) = @_; |
d0b74c17 |
861 | |
862 | my $location = unpack( |
863 | $self->{long_pack}, |
864 | substr( |
865 | $tag->{content}, |
866 | $index * $self->{long_size}, |
867 | $self->{long_size}, |
868 | ), |
869 | ); |
870 | |
871 | if (!$location) { return; } |
872 | |
e96daec8 |
873 | return $self->load_tag( $location ); |
d0b74c17 |
874 | } |
875 | |
6736c116 |
876 | sub traverse_index { |
beac1dff |
877 | ## |
878 | # Scan index and recursively step into deeper levels, looking for next key. |
879 | ## |
6736c116 |
880 | my $self = shift; |
881 | my ($obj, $offset, $ch, $force_return_next) = @_; |
d0b74c17 |
882 | |
21838116 |
883 | local($/,$\); |
884 | |
e96daec8 |
885 | my $tag = $self->load_tag( $offset ); |
6736c116 |
886 | |
e96daec8 |
887 | my $fh = $self->_fh; |
d0b74c17 |
888 | |
8db25060 |
889 | if ($tag->{signature} ne SIG_BLIST) { |
beac1dff |
890 | my $content = $tag->{content}; |
e5fc7e69 |
891 | my $start = $obj->{return_next} ? 0 : ord(substr($obj->{prev_md5}, $ch, 1)); |
d0b74c17 |
892 | |
d5d7c51d |
893 | for (my $idx = $start; $idx < (2**8); $idx++) { |
e5fc7e69 |
894 | my $subloc = unpack( |
895 | $self->{long_pack}, |
e06824f8 |
896 | substr( |
897 | $content, |
898 | $idx * $self->{long_size}, |
899 | $self->{long_size}, |
900 | ), |
e5fc7e69 |
901 | ); |
902 | |
beac1dff |
903 | if ($subloc) { |
e5fc7e69 |
904 | my $result = $self->traverse_index( |
905 | $obj, $subloc, $ch + 1, $force_return_next, |
906 | ); |
907 | |
beac1dff |
908 | if (defined($result)) { return $result; } |
909 | } |
910 | } # index loop |
d0b74c17 |
911 | |
beac1dff |
912 | $obj->{return_next} = 1; |
913 | } # tag is an index |
d0b74c17 |
914 | |
e5fc7e69 |
915 | else { |
beac1dff |
916 | my $keys = $tag->{content}; |
917 | if ($force_return_next) { $obj->{return_next} = 1; } |
d0b74c17 |
918 | |
beac1dff |
919 | ## |
920 | # Iterate through buckets, looking for a key match |
921 | ## |
8db25060 |
922 | for (my $i = 0; $i < $self->{max_buckets}; $i++) { |
9cec1360 |
923 | my ($key, $subloc) = $self->_get_key_subloc( $keys, $i ); |
d0b74c17 |
924 | |
8db25060 |
925 | # End of bucket list -- return to outer loop |
beac1dff |
926 | if (!$subloc) { |
beac1dff |
927 | $obj->{return_next} = 1; |
928 | last; |
929 | } |
8db25060 |
930 | # Located previous key -- return next one found |
beac1dff |
931 | elsif ($key eq $obj->{prev_md5}) { |
beac1dff |
932 | $obj->{return_next} = 1; |
933 | next; |
934 | } |
8db25060 |
935 | # Seek to bucket location and skip over signature |
beac1dff |
936 | elsif ($obj->{return_next}) { |
e96daec8 |
937 | seek($fh, $subloc + $self->_fileobj->{file_offset}, SEEK_SET); |
d0b74c17 |
938 | |
beac1dff |
939 | # Skip over value to get to plain key |
8db25060 |
940 | my $sig; |
941 | read( $fh, $sig, SIG_SIZE ); |
942 | |
beac1dff |
943 | my $size; |
e5fc7e69 |
944 | read( $fh, $size, $self->{data_size}); |
945 | $size = unpack($self->{data_pack}, $size); |
beac1dff |
946 | if ($size) { seek($fh, $size, SEEK_CUR); } |
d0b74c17 |
947 | |
beac1dff |
948 | # Read in plain key and return as scalar |
beac1dff |
949 | my $plain_key; |
e5fc7e69 |
950 | read( $fh, $size, $self->{data_size}); |
951 | $size = unpack($self->{data_pack}, $size); |
beac1dff |
952 | if ($size) { read( $fh, $plain_key, $size); } |
d0b74c17 |
953 | |
beac1dff |
954 | return $plain_key; |
955 | } |
8db25060 |
956 | } |
d0b74c17 |
957 | |
beac1dff |
958 | $obj->{return_next} = 1; |
959 | } # tag is a bucket list |
d0b74c17 |
960 | |
beac1dff |
961 | return; |
6736c116 |
962 | } |
963 | |
964 | sub get_next_key { |
beac1dff |
965 | ## |
966 | # Locate next key, given digested previous one |
967 | ## |
6736c116 |
968 | my $self = shift; |
969 | my ($obj) = @_; |
d0b74c17 |
970 | |
beac1dff |
971 | $obj->{prev_md5} = $_[1] ? $_[1] : undef; |
972 | $obj->{return_next} = 0; |
d0b74c17 |
973 | |
beac1dff |
974 | ## |
975 | # If the previous key was not specifed, start at the top and |
976 | # return the first one found. |
977 | ## |
978 | if (!$obj->{prev_md5}) { |
979 | $obj->{prev_md5} = chr(0) x $self->{hash_size}; |
980 | $obj->{return_next} = 1; |
981 | } |
d0b74c17 |
982 | |
beac1dff |
983 | return $self->traverse_index( $obj, $obj->_base_offset, 0 ); |
6736c116 |
984 | } |
985 | |
75be6413 |
986 | # Utilities |
987 | |
9cec1360 |
988 | sub _get_key_subloc { |
75be6413 |
989 | my $self = shift; |
990 | my ($keys, $idx) = @_; |
991 | |
c9b6d0d8 |
992 | my ($key, $subloc, $size, $transaction_id, $is_deleted) = unpack( |
28394a1a |
993 | # This is 'a', not 'A'. Please read the pack() documentation for the |
994 | # difference between the two and why it's important. |
c9b6d0d8 |
995 | "a$self->{hash_size} $self->{long_pack}2 n2", |
75be6413 |
996 | substr( |
997 | $keys, |
9cec1360 |
998 | ($idx * $self->{bucket_size}), |
999 | $self->{bucket_size}, |
75be6413 |
1000 | ), |
1001 | ); |
1002 | |
c9b6d0d8 |
1003 | return ($key, $subloc, $size, $transaction_id, $is_deleted); |
75be6413 |
1004 | } |
1005 | |
d608b06e |
1006 | sub _find_in_buckets { |
1007 | my $self = shift; |
21838116 |
1008 | my ($tag, $md5, $exact) = @_; |
d608b06e |
1009 | |
28394a1a |
1010 | my $trans_id = $self->_fileobj->transaction_id; |
1011 | |
21838116 |
1012 | my @zero; |
1013 | |
d608b06e |
1014 | BUCKET: |
1015 | for ( my $i = 0; $i < $self->{max_buckets}; $i++ ) { |
c9b6d0d8 |
1016 | my ($key, $subloc, $size, $transaction_id, $is_deleted) = $self->_get_key_subloc( |
9a187d8c |
1017 | $tag->{content}, $i, |
1018 | ); |
d608b06e |
1019 | |
c9b6d0d8 |
1020 | my @rv = ($subloc, $i * $self->{bucket_size}, $size, $is_deleted); |
21838116 |
1021 | |
1022 | unless ( $subloc ) { |
20b7f047 |
1023 | if ( !$exact && @zero and $trans_id ) { |
c9b6d0d8 |
1024 | @rv = ($zero[2], $zero[0] * $self->{bucket_size},$zero[3],$is_deleted); |
20b7f047 |
1025 | } |
21838116 |
1026 | return @rv; |
1027 | } |
1028 | |
1029 | next BUCKET if $key ne $md5; |
d608b06e |
1030 | |
21838116 |
1031 | # Save off the HEAD in case we need it. |
c9b6d0d8 |
1032 | @zero = ($i,$key,$subloc,$size,$transaction_id,$is_deleted) if $transaction_id == 0; |
d608b06e |
1033 | |
21838116 |
1034 | next BUCKET if $transaction_id != $trans_id; |
1035 | |
1036 | return @rv; |
d608b06e |
1037 | } |
1038 | |
1039 | return; |
1040 | } |
1041 | |
994ccd8e |
1042 | sub _request_space { |
1043 | my $self = shift; |
e96daec8 |
1044 | my ($size) = @_; |
994ccd8e |
1045 | |
460b1067 |
1046 | my $loc = $self->_fileobj->{end}; |
1047 | $self->_fileobj->{end} += $size; |
994ccd8e |
1048 | |
1049 | return $loc; |
1050 | } |
1051 | |
1052 | sub _release_space { |
1053 | my $self = shift; |
e96daec8 |
1054 | my ($size, $loc) = @_; |
994ccd8e |
1055 | |
21838116 |
1056 | local($/,$\); |
1057 | |
7b1e1aa1 |
1058 | my $next_loc = 0; |
1059 | |
e96daec8 |
1060 | my $fh = $self->_fh; |
1061 | seek( $fh, $loc + $self->_fileobj->{file_offset}, SEEK_SET ); |
7b1e1aa1 |
1062 | print( $fh SIG_FREE |
1063 | . pack($self->{long_pack}, $size ) |
1064 | . pack($self->{long_pack}, $next_loc ) |
1065 | ); |
1066 | |
994ccd8e |
1067 | return; |
1068 | } |
1069 | |
e96daec8 |
1070 | sub _throw_error { |
1071 | die "DBM::Deep: $_[1]\n"; |
1072 | } |
1073 | |
a20d9a3f |
1074 | 1; |
1075 | __END__ |
d5d7c51d |
1076 | |
1077 | # This will be added in later, after more refactoring is done. This is an early |
1078 | # attempt at refactoring on the physical level instead of the virtual level. |
1079 | sub _read_at { |
1080 | my $self = shift; |
e96daec8 |
1081 | my ($spot, $amount, $unpack) = @_; |
d5d7c51d |
1082 | |
21838116 |
1083 | local($/,$\); |
1084 | |
e96daec8 |
1085 | my $fh = $self->_fh; |
1086 | seek( $fh, $spot + $self->_fileobj->{file_offset}, SEEK_SET ); |
d5d7c51d |
1087 | |
1088 | my $buffer; |
1089 | my $bytes_read = read( $fh, $buffer, $amount ); |
1090 | |
1091 | if ( $unpack ) { |
1092 | $buffer = unpack( $unpack, $buffer ); |
1093 | } |
1094 | |
1095 | if ( wantarray ) { |
1096 | return ($buffer, $bytes_read); |
1097 | } |
1098 | else { |
1099 | return $buffer; |
1100 | } |
1101 | } |
e96daec8 |
1102 | |
1103 | sub _print_at { |
1104 | my $self = shift; |
1105 | my ($spot, $data) = @_; |
1106 | |
21838116 |
1107 | local($/,$\); |
1108 | |
e96daec8 |
1109 | my $fh = $self->_fh; |
1110 | seek( $fh, $spot, SEEK_SET ); |
1111 | print( $fh $data ); |
1112 | |
1113 | return; |
1114 | } |
1115 | |
1116 | sub get_file_version { |
1117 | my $self = shift; |
1118 | |
21838116 |
1119 | local($/,$\); |
1120 | |
e96daec8 |
1121 | my $fh = $self->_fh; |
1122 | |
1123 | seek( $fh, 13 + $self->_fileobj->{file_offset}, SEEK_SET ); |
1124 | my $buffer; |
1125 | my $bytes_read = read( $fh, $buffer, 4 ); |
1126 | unless ( $bytes_read == 4 ) { |
1127 | $self->_throw_error( "Cannot read file version" ); |
1128 | } |
1129 | |
1130 | return unpack( 'N', $buffer ); |
1131 | } |
1132 | |
1133 | sub write_file_version { |
1134 | my $self = shift; |
1135 | my ($new_version) = @_; |
1136 | |
21838116 |
1137 | local($/,$\); |
1138 | |
e96daec8 |
1139 | my $fh = $self->_fh; |
1140 | |
1141 | seek( $fh, 13 + $self->_fileobj->{file_offset}, SEEK_SET ); |
1142 | print( $fh pack( 'N', $new_version ) ); |
1143 | |
1144 | return; |
1145 | } |
1146 | |