author | Sverre Rabbelier <srabbelier@gmail.com> |
Sat, 15 Nov 2008 16:17:11 +0000 | |
changeset 482 | 839740b061ad |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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""" |
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This module implements a transaction manager that can be used to define |
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transaction handling in a request or view function. It is used by transaction |
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control middleware and decorators. |
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|
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The transaction manager can be in managed or in auto state. Auto state means the |
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system is using a commit-on-save strategy (actually it's more like |
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commit-on-change). As soon as the .save() or .delete() (or related) methods are |
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called, a commit is made. |
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|
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Managed transactions don't do those commits, but will need some kind of manual |
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or implicit commits or rollbacks. |
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""" |
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|
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try: |
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import thread |
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except ImportError: |
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import dummy_thread as thread |
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try: |
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from functools import wraps |
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except ImportError: |
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from django.utils.functional import wraps # Python 2.3, 2.4 fallback. |
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from django.db import connection |
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from django.conf import settings |
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class TransactionManagementError(Exception): |
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""" |
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This exception is thrown when something bad happens with transaction |
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management. |
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""" |
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pass |
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# The states are dictionaries of lists. The key to the dict is the current |
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# thread and the list is handled as a stack of values. |
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state = {} |
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savepoint_state = {} |
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|
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# The dirty flag is set by *_unless_managed functions to denote that the |
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# code under transaction management has changed things to require a |
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# database commit. |
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dirty = {} |
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def enter_transaction_management(): |
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""" |
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Enters transaction management for a running thread. It must be balanced with |
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the appropriate leave_transaction_management call, since the actual state is |
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managed as a stack. |
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|
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The state and dirty flag are carried over from the surrounding block or |
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from the settings, if there is no surrounding block (dirty is always false |
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when no current block is running). |
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""" |
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thread_ident = thread.get_ident() |
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if thread_ident in state and state[thread_ident]: |
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state[thread_ident].append(state[thread_ident][-1]) |
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else: |
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state[thread_ident] = [] |
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state[thread_ident].append(settings.TRANSACTIONS_MANAGED) |
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if thread_ident not in dirty: |
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dirty[thread_ident] = False |
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def leave_transaction_management(): |
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""" |
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Leaves transaction management for a running thread. A dirty flag is carried |
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over to the surrounding block, as a commit will commit all changes, even |
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those from outside. (Commits are on connection level.) |
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""" |
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thread_ident = thread.get_ident() |
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if thread_ident in state and state[thread_ident]: |
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del state[thread_ident][-1] |
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else: |
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raise TransactionManagementError("This code isn't under transaction management") |
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if dirty.get(thread_ident, False): |
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rollback() |
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raise TransactionManagementError("Transaction managed block ended with pending COMMIT/ROLLBACK") |
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dirty[thread_ident] = False |
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def is_dirty(): |
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""" |
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Returns True if the current transaction requires a commit for changes to |
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happen. |
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""" |
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return dirty.get(thread.get_ident(), False) |
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def set_dirty(): |
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""" |
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Sets a dirty flag for the current thread and code streak. This can be used |
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to decide in a managed block of code to decide whether there are open |
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changes waiting for commit. |
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""" |
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thread_ident = thread.get_ident() |
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if thread_ident in dirty: |
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dirty[thread_ident] = True |
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else: |
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raise TransactionManagementError("This code isn't under transaction management") |
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def set_clean(): |
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""" |
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Resets a dirty flag for the current thread and code streak. This can be used |
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to decide in a managed block of code to decide whether a commit or rollback |
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should happen. |
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""" |
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thread_ident = thread.get_ident() |
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if thread_ident in dirty: |
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dirty[thread_ident] = False |
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else: |
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raise TransactionManagementError("This code isn't under transaction management") |
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clean_savepoints() |
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def clean_savepoints(): |
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thread_ident = thread.get_ident() |
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if thread_ident in savepoint_state: |
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del savepoint_state[thread_ident] |
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def is_managed(): |
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""" |
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Checks whether the transaction manager is in manual or in auto state. |
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""" |
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thread_ident = thread.get_ident() |
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if thread_ident in state: |
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if state[thread_ident]: |
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return state[thread_ident][-1] |
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return settings.TRANSACTIONS_MANAGED |
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124 |
|
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def managed(flag=True): |
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""" |
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Puts the transaction manager into a manual state: managed transactions have |
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to be committed explicitly by the user. If you switch off transaction |
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management and there is a pending commit/rollback, the data will be |
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commited. |
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""" |
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thread_ident = thread.get_ident() |
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top = state.get(thread_ident, None) |
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if top: |
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top[-1] = flag |
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if not flag and is_dirty(): |
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connection._commit() |
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set_clean() |
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139 |
else: |
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raise TransactionManagementError("This code isn't under transaction management") |
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141 |
|
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def commit_unless_managed(): |
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""" |
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Commits changes if the system is not in managed transaction mode. |
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""" |
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if not is_managed(): |
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connection._commit() |
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clean_savepoints() |
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149 |
else: |
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set_dirty() |
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151 |
|
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def rollback_unless_managed(): |
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""" |
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Rolls back changes if the system is not in managed transaction mode. |
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""" |
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if not is_managed(): |
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connection._rollback() |
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158 |
else: |
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set_dirty() |
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160 |
|
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161 |
def commit(): |
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162 |
""" |
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Does the commit itself and resets the dirty flag. |
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""" |
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connection._commit() |
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set_clean() |
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167 |
|
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168 |
def rollback(): |
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""" |
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This function does the rollback itself and resets the dirty flag. |
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171 |
""" |
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connection._rollback() |
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set_clean() |
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174 |
|
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def savepoint(): |
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""" |
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Creates a savepoint (if supported and required by the backend) inside the |
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current transaction. Returns an identifier for the savepoint that will be |
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used for the subsequent rollback or commit. |
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""" |
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thread_ident = thread.get_ident() |
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if thread_ident in savepoint_state: |
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savepoint_state[thread_ident].append(None) |
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184 |
else: |
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savepoint_state[thread_ident] = [None] |
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tid = str(thread_ident).replace('-', '') |
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sid = "s%s_x%d" % (tid, len(savepoint_state[thread_ident])) |
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connection._savepoint(sid) |
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return sid |
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190 |
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def savepoint_rollback(sid): |
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192 |
""" |
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Rolls back the most recent savepoint (if one exists). Does nothing if |
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savepoints are not supported. |
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""" |
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if thread.get_ident() in savepoint_state: |
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connection._savepoint_rollback(sid) |
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def savepoint_commit(sid): |
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""" |
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201 |
Commits the most recent savepoint (if one exists). Does nothing if |
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savepoints are not supported. |
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""" |
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if thread.get_ident() in savepoint_state: |
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connection._savepoint_commit(sid) |
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206 |
|
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############## |
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# DECORATORS # |
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############## |
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211 |
def autocommit(func): |
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""" |
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Decorator that activates commit on save. This is Django's default behavior; |
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this decorator is useful if you globally activated transaction management in |
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your settings file and want the default behavior in some view functions. |
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216 |
""" |
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217 |
def _autocommit(*args, **kw): |
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try: |
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enter_transaction_management() |
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managed(False) |
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return func(*args, **kw) |
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finally: |
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leave_transaction_management() |
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return wraps(func)(_autocommit) |
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225 |
|
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def commit_on_success(func): |
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""" |
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This decorator activates commit on response. This way, if the view function |
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runs successfully, a commit is made; if the viewfunc produces an exception, |
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a rollback is made. This is one of the most common ways to do transaction |
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control in web apps. |
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232 |
""" |
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def _commit_on_success(*args, **kw): |
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try: |
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enter_transaction_management() |
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managed(True) |
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try: |
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res = func(*args, **kw) |
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except: |
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# All exceptions must be handled here (even string ones). |
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if is_dirty(): |
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rollback() |
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raise |
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else: |
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if is_dirty(): |
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commit() |
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return res |
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finally: |
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leave_transaction_management() |
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return wraps(func)(_commit_on_success) |
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|
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def commit_manually(func): |
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""" |
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Decorator that activates manual transaction control. It just disables |
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automatic transaction control and doesn't do any commit/rollback of its |
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own -- it's up to the user to call the commit and rollback functions |
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themselves. |
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""" |
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def _commit_manually(*args, **kw): |
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try: |
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enter_transaction_management() |
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managed(True) |
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return func(*args, **kw) |
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finally: |
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leave_transaction_management() |
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|
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return wraps(func)(_commit_manually) |