/usr/lib/python3/dist-packages/transaction/interfaces.py is in python3-transaction 1.4.3-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 | ##############################################################################
#
# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
import zope.interface
class ITransactionManager(zope.interface.Interface):
"""An object that manages a sequence of transactions.
Applications use transaction managers to establish transaction boundaries.
"""
def begin():
"""Begin a new transaction.
If an existing transaction is in progress, it will be aborted.
The newTransaction() method of registered synchronizers is called,
passing the new transaction object.
"""
def get():
"""Get the current transaction.
"""
def commit():
"""Commit the current transaction.
"""
def abort():
"""Abort the current transaction.
"""
def doom():
"""Doom the current transaction.
"""
def isDoomed():
"""Returns True if the current transaction is doomed, otherwise False.
"""
def savepoint(optimistic=False):
"""Create a savepoint from the current transaction.
If the optimistic argument is true, then data managers that
don't support savepoints can be used, but an error will be
raised if the savepoint is rolled back.
An ISavepoint object is returned.
"""
def registerSynch(synch):
"""Register an ISynchronizer.
Synchronizers are notified about some major events in a transaction's
life. See ISynchronizer for details.
"""
def unregisterSynch(synch):
"""Unregister an ISynchronizer.
Synchronizers are notified about some major events in a transaction's
life. See ISynchronizer for details.
"""
class ITransaction(zope.interface.Interface):
"""Object representing a running transaction.
Objects with this interface may represent different transactions
during their lifetime (.begin() can be called to start a new
transaction using the same instance, although that example is
deprecated and will go away in ZODB 3.6).
"""
user = zope.interface.Attribute(
"""A user name associated with the transaction.
The format of the user name is defined by the application. The value
is of Python type str. Storages record the user value, as meta-data,
when a transaction commits.
A storage may impose a limit on the size of the value; behavior is
undefined if such a limit is exceeded (for example, a storage may
raise an exception, or truncate the value).
""")
description = zope.interface.Attribute(
"""A textual description of the transaction.
The value is of Python type str. Method note() is the intended
way to set the value. Storages record the description, as meta-data,
when a transaction commits.
A storage may impose a limit on the size of the description; behavior
is undefined if such a limit is exceeded (for example, a storage may
raise an exception, or truncate the value).
""")
def commit():
"""Finalize the transaction.
This executes the two-phase commit algorithm for all
IDataManager objects associated with the transaction.
"""
def abort():
"""Abort the transaction.
This is called from the application. This can only be called
before the two-phase commit protocol has been started.
"""
def doom():
"""Doom the transaction.
Dooms the current transaction. This will cause
DoomedTransactionException to be raised on any attempt to commit the
transaction.
Otherwise the transaction will behave as if it was active.
"""
def savepoint(optimistic=False):
"""Create a savepoint.
If the optimistic argument is true, then data managers that don't
support savepoints can be used, but an error will be raised if the
savepoint is rolled back.
An ISavepoint object is returned.
"""
def join(datamanager):
"""Add a data manager to the transaction.
`datamanager` must provide the transactions.interfaces.IDataManager
interface.
"""
def note(text):
"""Add text to the transaction description.
This modifies the `.description` attribute; see its docs for more
detail. First surrounding whitespace is stripped from `text`. If
`.description` is currently an empty string, then the stripped text
becomes its value, else two newlines and the stripped text are
appended to `.description`.
"""
def setUser(user_name, path="/"):
"""Set the user name.
path should be provided if needed to further qualify the
identified user. This is a convenience method used by Zope.
It sets the .user attribute to str(path) + " " + str(user_name).
This sets the `.user` attribute; see its docs for more detail.
"""
def setExtendedInfo(name, value):
"""Add extension data to the transaction.
name is the name of the extension property to set, of Python type
str; value must be picklable. Multiple calls may be made to set
multiple extension properties, provided the names are distinct.
Storages record the extension data, as meta-data, when a transaction
commits.
A storage may impose a limit on the size of extension data; behavior
is undefined if such a limit is exceeded (for example, a storage may
raise an exception, or remove `<name, value>` pairs).
"""
# deprecated38
def beforeCommitHook(__hook, *args, **kws):
"""Register a hook to call before the transaction is committed.
THIS IS DEPRECATED IN ZODB 3.6. Use addBeforeCommitHook() instead.
The specified hook function will be called after the transaction's
commit method has been called, but before the commit process has been
started. The hook will be passed the specified positional and keyword
arguments.
Multiple hooks can be registered and will be called in the order they
were registered (first registered, first called). This method can
also be called from a hook: an executing hook can register more
hooks. Applications should take care to avoid creating infinite loops
by recursively registering hooks.
Hooks are called only for a top-level commit. A savepoint
does not call any hooks. If the transaction is aborted, hooks
are not called, and are discarded. Calling a hook "consumes" its
registration too: hook registrations do not persist across
transactions. If it's desired to call the same hook on every
transaction commit, then beforeCommitHook() must be called with that
hook during every transaction; in such a case consider registering a
synchronizer object via a TransactionManager's registerSynch() method
instead.
"""
def addBeforeCommitHook(hook, args=(), kws=None):
"""Register a hook to call before the transaction is committed.
The specified hook function will be called after the transaction's
commit method has been called, but before the commit process has been
started. The hook will be passed the specified positional (`args`)
and keyword (`kws`) arguments. `args` is a sequence of positional
arguments to be passed, defaulting to an empty tuple (no positional
arguments are passed). `kws` is a dictionary of keyword argument
names and values to be passed, or the default None (no keyword
arguments are passed).
Multiple hooks can be registered and will be called in the order they
were registered (first registered, first called). This method can
also be called from a hook: an executing hook can register more
hooks. Applications should take care to avoid creating infinite loops
by recursively registering hooks.
Hooks are called only for a top-level commit. A
savepoint creation does not call any hooks. If the
transaction is aborted, hooks are not called, and are discarded.
Calling a hook "consumes" its registration too: hook registrations
do not persist across transactions. If it's desired to call the same
hook on every transaction commit, then addBeforeCommitHook() must be
called with that hook during every transaction; in such a case
consider registering a synchronizer object via a TransactionManager's
registerSynch() method instead.
"""
def getBeforeCommitHooks():
"""Return iterable producing the registered addBeforeCommit hooks.
A triple (hook, args, kws) is produced for each registered hook.
The hooks are produced in the order in which they would be invoked
by a top-level transaction commit.
"""
def addAfterCommitHook(hook, args=(), kws=None):
"""Register a hook to call after a transaction commit attempt.
The specified hook function will be called after the transaction
commit succeeds or aborts. The first argument passed to the hook
is a Boolean value, true if the commit succeeded, or false if the
commit aborted. `args` specifies additional positional, and `kws`
keyword, arguments to pass to the hook. `args` is a sequence of
positional arguments to be passed, defaulting to an empty tuple
(only the true/false success argument is passed). `kws` is a
dictionary of keyword argument names and values to be passed, or
the default None (no keyword arguments are passed).
Multiple hooks can be registered and will be called in the order they
were registered (first registered, first called). This method can
also be called from a hook: an executing hook can register more
hooks. Applications should take care to avoid creating infinite loops
by recursively registering hooks.
Hooks are called only for a top-level commit. A
savepoint creation does not call any hooks. Calling a
hook "consumes" its registration: hook registrations do not
persist across transactions. If it's desired to call the same
hook on every transaction commit, then addAfterCommitHook() must be
called with that hook during every transaction; in such a case
consider registering a synchronizer object via a TransactionManager's
registerSynch() method instead.
"""
def getAfterCommitHooks():
"""Return iterable producing the registered addAfterCommit hooks.
A triple (hook, args, kws) is produced for each registered hook.
The hooks are produced in the order in which they would be invoked
by a top-level transaction commit.
"""
class ITransactionDeprecated(zope.interface.Interface):
"""Deprecated parts of the transaction API."""
def begin(info=None):
"""Begin a new transaction.
If the transaction is in progress, it is aborted and a new
transaction is started using the same transaction object.
"""
# TODO: deprecate this for 3.6.
def register(object):
"""Register the given object for transaction control."""
class IDataManager(zope.interface.Interface):
"""Objects that manage transactional storage.
These objects may manage data for other objects, or they may manage
non-object storages, such as relational databases. For example,
a ZODB.Connection.
Note that when some data is modified, that data's data manager should
join a transaction so that data can be committed when the user commits
the transaction.
"""
transaction_manager = zope.interface.Attribute(
"""The transaction manager (TM) used by this data manager.
This is a public attribute, intended for read-only use. The value
is an instance of ITransactionManager, typically set by the data
manager's constructor.
""")
def abort(transaction):
"""Abort a transaction and forget all changes.
Abort must be called outside of a two-phase commit.
Abort is called by the transaction manager to abort
transactions that are not yet in a two-phase commit. It may
also be called when rolling back a savepoint made before the
data manager joined the transaction.
In any case, after abort is called, the data manager is no
longer participating in the transaction. If there are new
changes, the data manager must rejoin the transaction.
"""
# Two-phase commit protocol. These methods are called by the ITransaction
# object associated with the transaction being committed. The sequence
# of calls normally follows this regular expression:
# tpc_begin commit tpc_vote (tpc_finish | tpc_abort)
def tpc_begin(transaction):
"""Begin commit of a transaction, starting the two-phase commit.
transaction is the ITransaction instance associated with the
transaction being committed.
"""
def commit(transaction):
"""Commit modifications to registered objects.
Save changes to be made persistent if the transaction commits (if
tpc_finish is called later). If tpc_abort is called later, changes
must not persist.
This includes conflict detection and handling. If no conflicts or
errors occur, the data manager should be prepared to make the
changes persist when tpc_finish is called.
"""
def tpc_vote(transaction):
"""Verify that a data manager can commit the transaction.
This is the last chance for a data manager to vote 'no'. A
data manager votes 'no' by raising an exception.
transaction is the ITransaction instance associated with the
transaction being committed.
"""
def tpc_finish(transaction):
"""Indicate confirmation that the transaction is done.
Make all changes to objects modified by this transaction persist.
transaction is the ITransaction instance associated with the
transaction being committed.
This should never fail. If this raises an exception, the
database is not expected to maintain consistency; it's a
serious error.
"""
def tpc_abort(transaction):
"""Abort a transaction.
This is called by a transaction manager to end a two-phase commit on
the data manager. Abandon all changes to objects modified by this
transaction.
transaction is the ITransaction instance associated with the
transaction being committed.
This should never fail.
"""
def sortKey():
"""Return a key to use for ordering registered DataManagers.
In order to guarantee a total ordering, keys must be strings.
ZODB uses a global sort order to prevent deadlock when it commits
transactions involving multiple resource managers. The resource
manager must define a sortKey() method that provides a global ordering
for resource managers.
"""
# Alternate version:
#"""Return a consistent sort key for this connection.
#
#This allows ordering multiple connections that use the same storage in
#a consistent manner. This is unique for the lifetime of a connection,
#which is good enough to avoid ZEO deadlocks.
#"""
class ISavepointDataManager(IDataManager):
def savepoint():
"""Return a data-manager savepoint (IDataManagerSavepoint).
"""
class IDataManagerSavepoint(zope.interface.Interface):
"""Savepoint for data-manager changes for use in transaction savepoints.
Datamanager savepoints are used by, and only by, transaction savepoints.
Note that data manager savepoints don't have any notion of, or
responsibility for, validity. It isn't the responsibility of
data-manager savepoints to prevent multiple rollbacks or rollbacks after
transaction termination. Preventing invalid savepoint rollback is the
responsibility of transaction rollbacks. Application code should never
use data-manager savepoints.
"""
def rollback():
"""Rollback any work done since the savepoint.
"""
class ISavepoint(zope.interface.Interface):
"""A transaction savepoint.
"""
def rollback():
"""Rollback any work done since the savepoint.
InvalidSavepointRollbackError is raised if the savepoint isn't valid.
"""
valid = zope.interface.Attribute(
"Boolean indicating whether the savepoint is valid")
class InvalidSavepointRollbackError(Exception):
"""Attempt to rollback an invalid savepoint.
A savepoint may be invalid because:
- The surrounding transaction has committed or aborted.
- An earlier savepoint in the same transaction has been rolled back.
"""
class ISynchronizer(zope.interface.Interface):
"""Objects that participate in the transaction-boundary notification API.
"""
def beforeCompletion(transaction):
"""Hook that is called by the transaction at the start of a commit.
"""
def afterCompletion(transaction):
"""Hook that is called by the transaction after completing a commit.
"""
def newTransaction(transaction):
"""Hook that is called at the start of a transaction.
This hook is called when, and only when, a transaction manager's
begin() method is called explictly.
"""
class TransactionError(Exception):
"""An error occurred due to normal transaction processing."""
class TransactionFailedError(TransactionError):
"""Cannot perform an operation on a transaction that previously failed.
An attempt was made to commit a transaction, or to join a transaction,
but this transaction previously raised an exception during an attempt
to commit it. The transaction must be explicitly aborted, either by
invoking abort() on the transaction, or begin() on its transaction
manager.
"""
class DoomedTransaction(TransactionError):
"""A commit was attempted on a transaction that was doomed."""
class TransientError(TransactionError):
"""An error has occured when performing a transaction.
It's possible that retrying the transaction will succeed.
"""
|