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1 | package DBIx::Class::Storage; |
a62cf8d4 |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
046ad905 |
6 | use base qw/DBIx::Class/; |
2ad62d97 |
7 | use mro 'c3'; |
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8 | |
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9 | { |
10 | package # Hide from PAUSE |
11 | DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION; |
12 | use base 'DBIx::Class::Exception'; |
13 | } |
14 | |
15 | use DBIx::Class::Carp; |
9345b14c |
16 | use DBIx::Class::Storage::BlockRunner; |
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17 | use Scalar::Util qw/blessed weaken/; |
1bc193ac |
18 | use DBIx::Class::Storage::TxnScopeGuard; |
f43ea814 |
19 | use Try::Tiny; |
fd323bf1 |
20 | use namespace::clean; |
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21 | |
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22 | __PACKAGE__->mk_group_accessors(simple => qw/debug schema transaction_depth auto_savepoint savepoints/); |
23 | __PACKAGE__->mk_group_accessors(component_class => 'cursor_class'); |
e4eb8ee1 |
24 | |
25 | __PACKAGE__->cursor_class('DBIx::Class::Cursor'); |
26 | |
27 | sub cursor { shift->cursor_class(@_); } |
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28 | |
046ad905 |
29 | =head1 NAME |
30 | |
31 | DBIx::Class::Storage - Generic Storage Handler |
32 | |
33 | =head1 DESCRIPTION |
34 | |
35 | A base implementation of common Storage methods. For specific |
36 | information about L<DBI>-based storage, see L<DBIx::Class::Storage::DBI>. |
37 | |
38 | =head1 METHODS |
39 | |
40 | =head2 new |
41 | |
42 | Arguments: $schema |
43 | |
44 | Instantiates the Storage object. |
45 | |
46 | =cut |
47 | |
48 | sub new { |
49 | my ($self, $schema) = @_; |
50 | |
51 | $self = ref $self if ref $self; |
52 | |
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53 | my $new = bless( { |
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54 | savepoints => [], |
55 | }, $self); |
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56 | |
57 | $new->set_schema($schema); |
4d753fb8 |
58 | $new->debug(1) |
59 | if $ENV{DBIX_CLASS_STORAGE_DBI_DEBUG} || $ENV{DBIC_TRACE}; |
046ad905 |
60 | |
61 | $new; |
62 | } |
63 | |
64 | =head2 set_schema |
65 | |
66 | Used to reset the schema class or object which owns this |
67 | storage object, such as during L<DBIx::Class::Schema/clone>. |
68 | |
69 | =cut |
70 | |
71 | sub set_schema { |
72 | my ($self, $schema) = @_; |
73 | $self->schema($schema); |
6298a324 |
74 | weaken $self->{schema} if ref $self->{schema}; |
046ad905 |
75 | } |
76 | |
77 | =head2 connected |
78 | |
79 | Returns true if we have an open storage connection, false |
80 | if it is not (yet) open. |
81 | |
82 | =cut |
83 | |
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84 | sub connected { die "Virtual method!" } |
046ad905 |
85 | |
86 | =head2 disconnect |
87 | |
88 | Closes any open storage connection unconditionally. |
89 | |
90 | =cut |
91 | |
92 | sub disconnect { die "Virtual method!" } |
93 | |
94 | =head2 ensure_connected |
95 | |
96 | Initiate a connection to the storage if one isn't already open. |
97 | |
98 | =cut |
99 | |
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100 | sub ensure_connected { die "Virtual method!" } |
046ad905 |
101 | |
102 | =head2 throw_exception |
103 | |
104 | Throws an exception - croaks. |
105 | |
106 | =cut |
107 | |
108 | sub throw_exception { |
109 | my $self = shift; |
110 | |
2a2a7b23 |
111 | if (ref $self and $self->schema) { |
1a58752c |
112 | $self->schema->throw_exception(@_); |
113 | } |
114 | else { |
115 | DBIx::Class::Exception->throw(@_); |
116 | } |
046ad905 |
117 | } |
a62cf8d4 |
118 | |
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119 | =head2 txn_do |
a62cf8d4 |
120 | |
4012acd8 |
121 | =over 4 |
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122 | |
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123 | =item Arguments: C<$coderef>, @coderef_args? |
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124 | |
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125 | =item Return Value: The return value of $coderef |
126 | |
127 | =back |
128 | |
129 | Executes C<$coderef> with (optional) arguments C<@coderef_args> atomically, |
130 | returning its result (if any). If an exception is caught, a rollback is issued |
131 | and the exception is rethrown. If the rollback fails, (i.e. throws an |
132 | exception) an exception is thrown that includes a "Rollback failed" message. |
133 | |
134 | For example, |
135 | |
136 | my $author_rs = $schema->resultset('Author')->find(1); |
137 | my @titles = qw/Night Day It/; |
138 | |
139 | my $coderef = sub { |
140 | # If any one of these fails, the entire transaction fails |
141 | $author_rs->create_related('books', { |
142 | title => $_ |
143 | }) foreach (@titles); |
144 | |
145 | return $author->books; |
146 | }; |
147 | |
148 | my $rs; |
20674fcd |
149 | try { |
4012acd8 |
150 | $rs = $schema->txn_do($coderef); |
20674fcd |
151 | } catch { |
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152 | my $error = shift; |
20674fcd |
153 | # Transaction failed |
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154 | die "something terrible has happened!" |
6b89ee0b |
155 | if ($error =~ /Rollback failed/); # Rollback failed |
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156 | |
157 | deal_with_failed_transaction(); |
20674fcd |
158 | }; |
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159 | |
160 | In a nested transaction (calling txn_do() from within a txn_do() coderef) only |
161 | the outermost transaction will issue a L</txn_commit>, and txn_do() can be |
162 | called in void, scalar and list context and it will behave as expected. |
163 | |
05075aee |
164 | Please note that all of the code in your coderef, including non-DBIx::Class |
165 | code, is part of a transaction. This transaction may fail out halfway, or |
166 | it may get partially double-executed (in the case that our DB connection |
167 | failed halfway through the transaction, in which case we reconnect and |
168 | restart the txn). Therefore it is best that any side-effects in your coderef |
169 | are idempotent (that is, can be re-executed multiple times and get the |
170 | same result), and that you check up on your side-effects in the case of |
171 | transaction failure. |
6500d50f |
172 | |
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173 | =cut |
174 | |
175 | sub txn_do { |
38ed54cd |
176 | my $self = shift; |
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177 | |
9345b14c |
178 | DBIx::Class::Storage::BlockRunner->new( |
179 | storage => $self, |
9345b14c |
180 | wrap_txn => 1, |
7d534e68 |
181 | retry_handler => sub { |
182 | $_[0]->failed_attempt_count == 1 |
183 | and |
184 | ! $_[0]->storage->connected |
185 | }, |
186 | )->run(@_); |
a62cf8d4 |
187 | } |
188 | |
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189 | =head2 txn_begin |
190 | |
191 | Starts a transaction. |
192 | |
193 | See the preferred L</txn_do> method, which allows for |
194 | an entire code block to be executed transactionally. |
195 | |
196 | =cut |
197 | |
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198 | sub txn_begin { |
199 | my $self = shift; |
200 | |
201 | if($self->transaction_depth == 0) { |
202 | $self->debugobj->txn_begin() |
203 | if $self->debug; |
204 | $self->_exec_txn_begin; |
205 | } |
206 | elsif ($self->auto_savepoint) { |
207 | $self->svp_begin; |
208 | } |
209 | $self->{transaction_depth}++; |
210 | |
211 | } |
046ad905 |
212 | |
213 | =head2 txn_commit |
214 | |
215 | Issues a commit of the current transaction. |
216 | |
be01f1be |
217 | It does I<not> perform an actual storage commit unless there's a DBIx::Class |
218 | transaction currently in effect (i.e. you called L</txn_begin>). |
219 | |
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220 | =cut |
221 | |
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222 | sub txn_commit { |
223 | my $self = shift; |
224 | |
225 | if ($self->transaction_depth == 1) { |
226 | $self->debugobj->txn_commit() if $self->debug; |
227 | $self->_exec_txn_commit; |
228 | $self->{transaction_depth}--; |
398215b1 |
229 | $self->savepoints([]); |
90d7422f |
230 | } |
231 | elsif($self->transaction_depth > 1) { |
232 | $self->{transaction_depth}--; |
233 | $self->svp_release if $self->auto_savepoint; |
234 | } |
235 | else { |
236 | $self->throw_exception( 'Refusing to commit without a started transaction' ); |
237 | } |
238 | } |
046ad905 |
239 | |
240 | =head2 txn_rollback |
241 | |
242 | Issues a rollback of the current transaction. A nested rollback will |
243 | throw a L<DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION> exception, |
244 | which allows the rollback to propagate to the outermost transaction. |
245 | |
246 | =cut |
247 | |
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248 | sub txn_rollback { |
249 | my $self = shift; |
250 | |
251 | if ($self->transaction_depth == 1) { |
252 | $self->debugobj->txn_rollback() if $self->debug; |
253 | $self->_exec_txn_rollback; |
254 | $self->{transaction_depth}--; |
398215b1 |
255 | $self->savepoints([]); |
90d7422f |
256 | } |
257 | elsif ($self->transaction_depth > 1) { |
258 | $self->{transaction_depth}--; |
259 | |
260 | if ($self->auto_savepoint) { |
261 | $self->svp_rollback; |
262 | $self->svp_release; |
263 | } |
264 | else { |
265 | DBIx::Class::Storage::NESTED_ROLLBACK_EXCEPTION->throw( |
266 | "A txn_rollback in nested transaction is ineffective! (depth $self->{transaction_depth})" |
267 | ); |
268 | } |
269 | } |
270 | else { |
271 | $self->throw_exception( 'Refusing to roll back without a started transaction' ); |
272 | } |
273 | } |
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274 | |
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275 | =head2 svp_begin |
276 | |
360dc8a5 |
277 | Arguments: $savepoint_name? |
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278 | |
360dc8a5 |
279 | Created a new savepoint using the name provided as argument. If no name |
280 | is provided, a random name will be used. |
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281 | |
282 | =cut |
283 | |
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284 | sub svp_begin { |
285 | my ($self, $name) = @_; |
286 | |
287 | $self->throw_exception ("You can't use savepoints outside a transaction") |
288 | unless $self->transaction_depth; |
289 | |
290 | my $exec = $self->can('_exec_svp_begin') |
291 | or $self->throw_exception ("Your Storage implementation doesn't support savepoints"); |
292 | |
293 | $name = $self->_svp_generate_name |
294 | unless defined $name; |
295 | |
296 | push @{ $self->{savepoints} }, $name; |
297 | |
298 | $self->debugobj->svp_begin($name) if $self->debug; |
299 | |
300 | $exec->($self, $name); |
301 | } |
302 | |
303 | sub _svp_generate_name { |
304 | my ($self) = @_; |
305 | return 'savepoint_'.scalar(@{ $self->{'savepoints'} }); |
306 | } |
307 | |
adb3554a |
308 | |
309 | =head2 svp_release |
310 | |
360dc8a5 |
311 | Arguments: $savepoint_name? |
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312 | |
360dc8a5 |
313 | Release the savepoint provided as argument. If none is provided, |
314 | release the savepoint created most recently. This will implicitly |
315 | release all savepoints created after the one explicitly released as well. |
adb3554a |
316 | |
317 | =cut |
318 | |
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319 | sub svp_release { |
320 | my ($self, $name) = @_; |
321 | |
322 | $self->throw_exception ("You can't use savepoints outside a transaction") |
323 | unless $self->transaction_depth; |
324 | |
325 | my $exec = $self->can('_exec_svp_release') |
326 | or $self->throw_exception ("Your Storage implementation doesn't support savepoints"); |
327 | |
328 | if (defined $name) { |
329 | my @stack = @{ $self->savepoints }; |
330 | my $svp; |
331 | |
332 | do { $svp = pop @stack } until $svp eq $name; |
333 | |
334 | $self->throw_exception ("Savepoint '$name' does not exist") |
335 | unless $svp; |
336 | |
337 | $self->savepoints(\@stack); # put back what's left |
338 | } |
339 | else { |
340 | $name = pop @{ $self->savepoints } |
341 | or $self->throw_exception('No savepoints to release');; |
342 | } |
343 | |
344 | $self->debugobj->svp_release($name) if $self->debug; |
345 | |
346 | $exec->($self, $name); |
347 | } |
adb3554a |
348 | |
349 | =head2 svp_rollback |
350 | |
360dc8a5 |
351 | Arguments: $savepoint_name? |
adb3554a |
352 | |
360dc8a5 |
353 | Rollback to the savepoint provided as argument. If none is provided, |
354 | rollback to the savepoint created most recently. This will implicitly |
355 | release all savepoints created after the savepoint we rollback to. |
adb3554a |
356 | |
357 | =cut |
358 | |
90d7422f |
359 | sub svp_rollback { |
360 | my ($self, $name) = @_; |
361 | |
362 | $self->throw_exception ("You can't use savepoints outside a transaction") |
363 | unless $self->transaction_depth; |
364 | |
365 | my $exec = $self->can('_exec_svp_rollback') |
366 | or $self->throw_exception ("Your Storage implementation doesn't support savepoints"); |
367 | |
368 | if (defined $name) { |
369 | my @stack = @{ $self->savepoints }; |
370 | my $svp; |
371 | |
372 | # a rollback doesn't remove the named savepoint, |
373 | # only everything after it |
374 | while (@stack and $stack[-1] ne $name) { |
375 | pop @stack |
376 | }; |
377 | |
378 | $self->throw_exception ("Savepoint '$name' does not exist") |
379 | unless @stack; |
380 | |
381 | $self->savepoints(\@stack); # put back what's left |
382 | } |
383 | else { |
384 | $name = $self->savepoints->[-1] |
385 | or $self->throw_exception('No savepoints to rollback');; |
386 | } |
387 | |
388 | $self->debugobj->svp_rollback($name) if $self->debug; |
389 | |
390 | $exec->($self, $name); |
391 | } |
adb3554a |
392 | |
11544e1d |
393 | =head2 txn_scope_guard |
3b7f3eac |
394 | |
11544e1d |
395 | An alternative way of transaction handling based on |
396 | L<DBIx::Class::Storage::TxnScopeGuard>: |
1bc193ac |
397 | |
11544e1d |
398 | my $txn_guard = $storage->txn_scope_guard; |
89028f42 |
399 | |
47d7b769 |
400 | $result->col1("val1"); |
401 | $result->update; |
89028f42 |
402 | |
11544e1d |
403 | $txn_guard->commit; |
89028f42 |
404 | |
11544e1d |
405 | If an exception occurs, or the guard object otherwise leaves the scope |
406 | before C<< $txn_guard->commit >> is called, the transaction will be rolled |
407 | back by an explicit L</txn_rollback> call. In essence this is akin to |
408 | using a L</txn_begin>/L</txn_commit> pair, without having to worry |
409 | about calling L</txn_rollback> at the right places. Note that since there |
410 | is no defined code closure, there will be no retries and other magic upon |
411 | database disconnection. If you need such functionality see L</txn_do>. |
1bc193ac |
412 | |
413 | =cut |
414 | |
415 | sub txn_scope_guard { |
416 | return DBIx::Class::Storage::TxnScopeGuard->new($_[0]); |
417 | } |
418 | |
046ad905 |
419 | =head2 sql_maker |
420 | |
421 | Returns a C<sql_maker> object - normally an object of class |
d5dedbd6 |
422 | C<DBIx::Class::SQLMaker>. |
046ad905 |
423 | |
424 | =cut |
425 | |
426 | sub sql_maker { die "Virtual method!" } |
427 | |
428 | =head2 debug |
429 | |
f92a9d79 |
430 | Causes trace information to be emitted on the L</debugobj> object. |
431 | (or C<STDERR> if L</debugobj> has not specifically been set). |
046ad905 |
432 | |
433 | This is the equivalent to setting L</DBIC_TRACE> in your |
434 | shell environment. |
435 | |
436 | =head2 debugfh |
437 | |
4d93345c |
438 | An opportunistic proxy to L<< ->debugobj->debugfh(@_) |
439 | |DBIx::Class::Storage::Statistics/debugfh >> |
440 | If the currently set L</debugobj> does not have a L</debugfh> method, caling |
441 | this is a no-op. |
046ad905 |
442 | |
443 | =cut |
444 | |
445 | sub debugfh { |
446 | my $self = shift; |
447 | |
448 | if ($self->debugobj->can('debugfh')) { |
449 | return $self->debugobj->debugfh(@_); |
450 | } |
451 | } |
452 | |
453 | =head2 debugobj |
454 | |
455 | Sets or retrieves the object used for metric collection. Defaults to an instance |
456 | of L<DBIx::Class::Storage::Statistics> that is compatible with the original |
457 | method of using a coderef as a callback. See the aforementioned Statistics |
458 | class for more information. |
459 | |
4d753fb8 |
460 | =cut |
461 | |
462 | sub debugobj { |
463 | my $self = shift; |
464 | |
465 | if (@_) { |
466 | return $self->{debugobj} = $_[0]; |
467 | } |
468 | |
469 | $self->{debugobj} ||= do { |
470 | if (my $profile = $ENV{DBIC_TRACE_PROFILE}) { |
471 | require DBIx::Class::Storage::Debug::PrettyPrint; |
6e102c8f |
472 | my @pp_args; |
473 | |
4d753fb8 |
474 | if ($profile =~ /^\.?\//) { |
475 | require Config::Any; |
476 | |
477 | my $cfg = try { |
478 | Config::Any->load_files({ files => [$profile], use_ext => 1 }); |
479 | } catch { |
480 | # sanitize the error message a bit |
481 | $_ =~ s/at \s+ .+ Storage\.pm \s line \s \d+ $//x; |
482 | $self->throw_exception("Failure processing \$ENV{DBIC_TRACE_PROFILE}: $_"); |
483 | }; |
484 | |
6e102c8f |
485 | @pp_args = values %{$cfg->[0]}; |
4d753fb8 |
486 | } |
487 | else { |
6e102c8f |
488 | @pp_args = { profile => $profile }; |
489 | } |
490 | |
491 | # FIXME - FRAGILE |
492 | # Hash::Merge is a sorry piece of shit and tramples all over $@ |
493 | # *without* throwing an exception |
494 | # This is a rather serious problem in the debug codepath |
495 | # Insulate the condition here with a try{} until a review of |
496 | # DBIx::Class::Storage::Debug::PrettyPrint takes place |
497 | # we do rethrow the error unconditionally, the only reason |
498 | # to try{} is to preserve the precise state of $@ (down |
499 | # to the scalar (if there is one) address level) |
500 | # |
501 | # Yes I am aware this is fragile and TxnScopeGuard needs |
502 | # a better fix. This is another yak to shave... :( |
503 | try { |
504 | DBIx::Class::Storage::Debug::PrettyPrint->new(@pp_args); |
505 | } catch { |
506 | $self->throw_exception($_); |
4d753fb8 |
507 | } |
508 | } |
509 | else { |
510 | require DBIx::Class::Storage::Statistics; |
511 | DBIx::Class::Storage::Statistics->new |
512 | } |
513 | }; |
514 | } |
515 | |
046ad905 |
516 | =head2 debugcb |
517 | |
518 | Sets a callback to be executed each time a statement is run; takes a sub |
519 | reference. Callback is executed as $sub->($op, $info) where $op is |
520 | SELECT/INSERT/UPDATE/DELETE and $info is what would normally be printed. |
521 | |
f92a9d79 |
522 | See L</debugobj> for a better way. |
046ad905 |
523 | |
524 | =cut |
525 | |
526 | sub debugcb { |
527 | my $self = shift; |
528 | |
529 | if ($self->debugobj->can('callback')) { |
530 | return $self->debugobj->callback(@_); |
531 | } |
532 | } |
533 | |
e4eb8ee1 |
534 | =head2 cursor_class |
046ad905 |
535 | |
536 | The cursor class for this Storage object. |
537 | |
538 | =cut |
539 | |
046ad905 |
540 | =head2 deploy |
541 | |
542 | Deploy the tables to storage (CREATE TABLE and friends in a SQL-based |
543 | Storage class). This would normally be called through |
544 | L<DBIx::Class::Schema/deploy>. |
545 | |
546 | =cut |
547 | |
548 | sub deploy { die "Virtual method!" } |
549 | |
a3eaff0e |
550 | =head2 connect_info |
551 | |
552 | The arguments of C<connect_info> are always a single array reference, |
553 | and are Storage-handler specific. |
554 | |
555 | This is normally accessed via L<DBIx::Class::Schema/connection>, which |
556 | encapsulates its argument list in an arrayref before calling |
557 | C<connect_info> here. |
558 | |
559 | =cut |
560 | |
046ad905 |
561 | sub connect_info { die "Virtual method!" } |
a3eaff0e |
562 | |
563 | =head2 select |
564 | |
565 | Handle a select statement. |
566 | |
567 | =cut |
568 | |
569 | sub select { die "Virtual method!" } |
570 | |
571 | =head2 insert |
572 | |
573 | Handle an insert statement. |
574 | |
575 | =cut |
576 | |
046ad905 |
577 | sub insert { die "Virtual method!" } |
a3eaff0e |
578 | |
579 | =head2 update |
580 | |
581 | Handle an update statement. |
582 | |
583 | =cut |
584 | |
046ad905 |
585 | sub update { die "Virtual method!" } |
a3eaff0e |
586 | |
587 | =head2 delete |
588 | |
589 | Handle a delete statement. |
590 | |
591 | =cut |
592 | |
046ad905 |
593 | sub delete { die "Virtual method!" } |
a3eaff0e |
594 | |
595 | =head2 select_single |
596 | |
597 | Performs a select, fetch and return of data - handles a single row |
598 | only. |
599 | |
600 | =cut |
601 | |
046ad905 |
602 | sub select_single { die "Virtual method!" } |
a3eaff0e |
603 | |
604 | =head2 columns_info_for |
605 | |
c22c7625 |
606 | Returns metadata for the given source's columns. This |
607 | is *deprecated*, and will be removed before 1.0. You should |
608 | be specifying the metadata yourself if you need it. |
a3eaff0e |
609 | |
610 | =cut |
611 | |
046ad905 |
612 | sub columns_info_for { die "Virtual method!" } |
613 | |
614 | =head1 ENVIRONMENT VARIABLES |
615 | |
616 | =head2 DBIC_TRACE |
617 | |
618 | If C<DBIC_TRACE> is set then trace information |
f92a9d79 |
619 | is produced (as when the L</debug> method is set). |
046ad905 |
620 | |
621 | If the value is of the form C<1=/path/name> then the trace output is |
622 | written to the file C</path/name>. |
623 | |
624 | This environment variable is checked when the storage object is first |
fd323bf1 |
625 | created (when you call connect on your schema). So, run-time changes |
626 | to this environment variable will not take effect unless you also |
046ad905 |
627 | re-connect on your schema. |
628 | |
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629 | =head2 DBIC_TRACE_PROFILE |
630 | |
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631 | If C<DBIC_TRACE_PROFILE> is set, L<DBIx::Class::Storage::Debug::PrettyPrint> |
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632 | will be used to format the output from C<DBIC_TRACE>. The value it |
633 | is set to is the C<profile> that it will be used. If the value is a |
634 | filename the file is read with L<Config::Any> and the results are |
635 | used as the configuration for tracing. See L<SQL::Abstract::Tree/new> |
636 | for what that structure should look like. |
637 | |
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638 | =head2 DBIX_CLASS_STORAGE_DBI_DEBUG |
639 | |
640 | Old name for DBIC_TRACE |
641 | |
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642 | =head1 SEE ALSO |
643 | |
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644 | L<DBIx::Class::Storage::DBI> - reference storage implementation using |
645 | SQL::Abstract and DBI. |
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646 | |
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647 | =head1 FURTHER QUESTIONS? |
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648 | |
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649 | Check the list of L<additional DBIC resources|DBIx::Class/GETTING HELP/SUPPORT>. |
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650 | |
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651 | =head1 COPYRIGHT AND LICENSE |
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652 | |
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653 | This module is free software L<copyright|DBIx::Class/COPYRIGHT AND LICENSE> |
654 | by the L<DBIx::Class (DBIC) authors|DBIx::Class/AUTHORS>. You can |
655 | redistribute it and/or modify it under the same terms as the |
656 | L<DBIx::Class library|DBIx::Class/COPYRIGHT AND LICENSE>. |
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657 | |
658 | =cut |
659 | |
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660 | 1; |