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� Z d e f d � � YZ d e j f d � � YZ d e f d � � YZ e d � Z e � Z d e f d � � YZ d S( s' Base constructs for connection pools.
i����( t dequeNi ( t event( t exc( t
interfaces( t log( t util( t threadingt reset_rollbackt reset_committ
reset_nonet _ConnDialectc B s2 e Z d Z d � Z d � Z d � Z d � Z RS( s� partial implementation of :class:`.Dialect`
which provides DBAPI connection methods.
When a :class:`.Pool` is combined with an :class:`.Engine`,
the :class:`.Engine` replaces this with its own
:class:`.Dialect`.
c C s | j � d S( N( t rollback( t selft dbapi_connection( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyt do_rollback) s c C s | j � d S( N( t commit( R R
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( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyt do_close/ s c C s t d � � d S( NsJ The ping feature requires that a dialect is passed to the connection pool.( t NotImplementedError( R R
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t Poolc B s e Z d Z e � Z e j d d d d � d d e d e d d d e d d �
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� d � � Z d � Z d � Z d e d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z RS( s) Abstract base class for connection pools.t use_threadlocals 1.3sf The :paramref:`.Pool.use_threadlocal` parameter is deprecated and will be removed in a future release.t listenerss 0.7s� :class:`.PoolListener` is deprecated in favor of the :class:`.PoolEvents` listener interface. The :paramref:`.Pool.listeners` parameter will be removed in a future release.i����c C s | r | | _ | _ n d | _ t j | d | �t j � | _ | | _ | | _ d | _
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Construct a Pool.
:param creator: a callable function that returns a DB-API
connection object. The function will be called with
parameters.
:param recycle: If set to a value other than -1, number of
seconds between connection recycling, which means upon
checkout, if this timeout is surpassed the connection will be
closed and replaced with a newly opened connection. Defaults to -1.
:param logging_name: String identifier which will be used within
the "name" field of logging records generated within the
"sqlalchemy.pool" logger. Defaults to a hexstring of the object's
id.
:param echo: if True, the connection pool will log
informational output such as when connections are invalidated
as well as when connections are recycled to the default log handler,
which defaults to ``sys.stdout`` for output.. If set to the string
``"debug"``, the logging will include pool checkouts and checkins.
The :paramref:`.Pool.echo` parameter can also be set from the
:func:`.create_engine` call by using the
:paramref:`.create_engine.echo_pool` parameter.
.. seealso::
:ref:`dbengine_logging` - further detail on how to configure
logging.
:param use_threadlocal: If set to True, repeated calls to
:meth:`connect` within the same application thread will be
guaranteed to return the same connection object that is already
checked out. This is a legacy use case and the flag has no
effect when using the pool with a :class:`.Engine` object.
:param reset_on_return: Determine steps to take on
connections as they are returned to the pool.
reset_on_return can have any of these values:
* ``"rollback"`` - call rollback() on the connection,
to release locks and transaction resources.
This is the default value. The vast majority
of use cases should leave this value set.
* ``True`` - same as 'rollback', this is here for
backwards compatibility.
* ``"commit"`` - call commit() on the connection,
to release locks and transaction resources.
A commit here may be desirable for databases that
cache query plans if a commit is emitted,
such as Microsoft SQL Server. However, this
value is more dangerous than 'rollback' because
any data changes present on the transaction
are committed unconditionally.
* ``None`` - don't do anything on the connection.
This setting should generally only be made on a database
that has no transaction support at all,
namely MySQL MyISAM; when used on this backend, performance
can be improved as the "rollback" call is still expensive on
MySQL. It is **strongly recommended** that this setting not be
used for transaction-supporting databases in conjunction with
a persistent pool such as :class:`.QueuePool`, as it opens
the possibility for connections still in a transaction to be
idle in the pool. The setting may be appropriate in the
case of :class:`.NullPool` or special circumstances where
the connection pool in use is not being used to maintain connection
lifecycle.
* ``False`` - same as None, this is here for
backwards compatibility.
:param events: a list of 2-tuples, each of the form
``(callable, target)`` which will be passed to :func:`.event.listen`
upon construction. Provided here so that event listeners
can be assigned via :func:`.create_engine` before dialect-level
listeners are applied.
:param listeners: A list of :class:`.PoolListener`-like objects or
dictionaries of callables that receive events when DB-API
connections are created, checked out and checked in to the
pool.
:param dialect: a :class:`.Dialect` that will handle the job
of calling rollback(), close(), or commit() on DBAPI connections.
If omitted, a built-in "stub" dialect is used. Applications that
make use of :func:`~.create_engine` should not use this parameter
as it is handled by the engine creation strategy.
.. versionadded:: 1.1 - ``dialect`` is now a public parameter
to the :class:`.Pool`.
:param pre_ping: if True, the pool will emit a "ping" (typically
"SELECT 1", but is dialect-specific) on the connection
upon checkout, to test if the connection is alive or not. If not,
the connection is transparently re-connected and upon success, all
other pooled connections established prior to that timestamp are
invalidated. Requires that a dialect is passed as well to
interpret the disconnection error.
.. versionadded:: 1.2
t echoflagi R t noneR s' Invalid value for 'reset_on_return': %rt only_propagateN( t logging_namet _orig_logging_namet NoneR t instance_loggerR t localt _threadconnst _creatort _recyclet _invalidate_timet _use_threadlocalt _pre_pingt TrueR t _reset_on_returnt FalseR R R t
ArgumentErrort echot dispatcht _updatet _dialectR t listent add_listener( R t creatort recycleR- R R t reset_on_returnR t eventst dialectt pre_pingt _dispatcht fnt targett l( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyt __init__? s: �
c C s | j d S( NR$ ( t __dict__( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyR$ � s c C s# | | j d <| j | � | _ d S( NR$ ( R> t _should_wrap_creatort _invoke_creator( R R3 ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyR$ � s
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sl Detect if creator accepts a single argument, or is sent
as a legacy style no-arg function.
t no_selfc s � � S( N( ( t crec( R3 ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyt <lambda>� t i i t connection_recordi c s � � S( N( ( RB ( R3 ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyRC RD N( N( R t get_callable_argspecR$ R) t TypeErrorR t len( R R3 t argspect defaultedt positionals( ( R3 sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyR? � s
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rS | j j d | d t �n Xd S( Ns Closing connection %rs Exception closing connection %rt exc_info( t loggert debugR0 R t Exceptiont errorR) ( R t
connection( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyt _close_connection
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s� The :meth:`.Pool.add_listener` method is deprecated and will be removed in a future release. Please use the :class:`.PoolEvents` listener interface.c C s t j j | | � d S( s Add a :class:`.PoolListener`-like object to this pool.
``listener`` may be an object that implements some or all of
PoolListener, or a dictionary of callables containing implementations
of some or all of the named methods in PoolListener.
N( R t PoolListenert _adapt_listener( R t listener( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyR2 s c C s
t j | � S( s� Produce a DBAPI connection that is not referenced by any
thread-local context.
This method is equivalent to :meth:`.Pool.connect` when the
:paramref:`.Pool.use_threadlocal` flag is not set to True.
When :paramref:`.Pool.use_threadlocal` is True, the
:meth:`.Pool.unique_connection` method provides a means of bypassing
the threadlocal context.
( t _ConnectionFairyt _checkout( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyt unique_connection$ s c C s
t | � S( s6 Called by subclasses to create a new ConnectionRecord.( t _ConnectionRecord( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyt _create_connection1 s c C si t | d d � } | s+ | j | j k r= t j � | _ n | re t | d t � re | j | � n d S( s� Mark all connections established within the generation
of the given connection as invalidated.
If this pool's last invalidate time is before when the given
connection was created, update the timestamp til now. Otherwise,
no action is performed.
Connections with a start time prior to this pool's invalidation
time will be recycled upon next checkout.
t _connection_recordt is_validN( t getattrR R& t starttimet timeR+ t
invalidate( R RQ t exceptiont _checkint rec( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyt _invalidate6 s
c C s
t � � d S( s Return a new :class:`.Pool`, of the same class as this one
and configured with identical creation arguments.
This method is used in conjunction with :meth:`dispose`
to close out an entire :class:`.Pool` and create a new one in
its place.
N( R ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyt recreateG s
c C s
t � � d S( s� Dispose of this pool.
This method leaves the possibility of checked-out connections
remaining open, as it only affects connections that are
idle in the pool.
.. seealso::
:meth:`Pool.recreate`
N( R ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyt disposeS s
c C sf | j s t j | � Sy | j j � } Wn t k
r< n X| d k rS | j � St j | | j � S( s� Return a DBAPI connection from the pool.
The connection is instrumented such that when its
``close()`` method is called, the connection will be returned to
the pool.
N( R' RV RW R# t currentt AttributeErrorR t _checkout_existing( R Rc ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyt connectb s
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r) q- Xn | j | � d S( s� Given a _ConnectionRecord, return it to the :class:`.Pool`.
This method is called when an instrumented DBAPI connection
has its ``close()`` method called.
N( R' R# Rg Rh t _do_return_conn( R t record( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyt _return_connw s
c C s
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t � � d S( s? Implementation for :meth:`return_conn`, supplied by subclasses.N( R ( R t conn( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyRk � s c C s
t � � d S( N( R ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyt status� s ( s 1.3sf The :paramref:`.Pool.use_threadlocal` parameter is deprecated and will be removed in a future release.( s 0.7s� :class:`.PoolListener` is deprecated in favor of the :class:`.PoolEvents` listener interface. The :paramref:`.Pool.listeners` parameter will be removed in a future release.N( R R R R
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RY c B s� e Z d Z e d � Z d Z d Z d Z d Z e
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e d � � Z d � Z e d � Z e d � � Z e d � � Z d
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� Z e d � Z RS( s� Internal object which maintains an individual DBAPI connection
referenced by a :class:`.Pool`.
The :class:`._ConnectionRecord` object always exists for any particular
DBAPI connection whether or not that DBAPI connection has been
"checked out". This is in contrast to the :class:`._ConnectionFairy`
which is only a public facade to the DBAPI connection while it is checked
out.
A :class:`._ConnectionRecord` may exist for a span longer than that
of a single DBAPI connection. For example, if the
:meth:`._ConnectionRecord.invalidate`
method is called, the DBAPI connection associated with this
:class:`._ConnectionRecord`
will be discarded, but the :class:`._ConnectionRecord` may be used again,
in which case a new DBAPI connection is produced when the :class:`.Pool`
next uses this record.
The :class:`._ConnectionRecord` is delivered along with connection
pool events, including :meth:`.PoolEvents.connect` and
:meth:`.PoolEvents.checkout`, however :class:`._ConnectionRecord` still
remains an internal object whose API and internals may change.
.. seealso::
:class:`._ConnectionFairy`
c C s2 | | _ | r" | j d t � n t � | _ d S( Nt first_connect_check( t _ConnectionRecord__poolt _ConnectionRecord__connectR) R t finalize_callback( R t poolRj ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyR= � s i c C s i S( sY The ``.info`` dictionary associated with the DBAPI connection.
This dictionary is shared among the :attr:`._ConnectionFairy.info`
and :attr:`.Connection.info` accessors.
.. note::
The lifespan of this dictionary is linked to the
DBAPI connection itself, meaning that it is **discarded** each time
the DBAPI connection is closed and/or invalidated. The
:attr:`._ConnectionRecord.record_info` dictionary remains
persistent throughout the lifespan of the
:class:`._ConnectionRecord` container.
( ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyt info� s c C s i S( s� An "info' dictionary associated with the connection record
itself.
Unlike the :attr:`._ConnectionRecord.info` dictionary, which is linked
to the lifespan of the DBAPI connection, this dictionary is linked
to the lifespan of the :class:`._ConnectionRecord` container itself
and will remain persistent throughout the life of the
:class:`._ConnectionRecord`.
.. versionadded:: 1.1
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j d | � n | S( Nc s t o t d � � | � � S( N( t _finalize_fairyR ( t ref( R- Ry Rc ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyRC � s s# Connection %r checked out from pool( Rn t get_connectionRO R t safe_reraiset _checkin_failedt _should_log_debugRV t weakrefR} t fairy_reft _refst addRM RN ( t clsRy R
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_no_fairy_ref( R` t checkinR) ( R R� ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyR� s c C s� | j d k r+ | r+ t j d | � d Sd | _ | j } | j } x& | j rn | j j � } | | � qI W| j j r� | j j | | � n | j
| � d S( Ns Double checkin attempted on %s( R� R R t warnRQ Rv Rx t popR. R� Rm ( R R� RQ Ry t finalizer( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyR� s c C s
| j d k S( N( R� R ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyt in_use s c C s | j S( N( R^ ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyt last_connect_time s c C s | j d k r | j � n d S( N( RQ R t _ConnectionRecord__close( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyR s c C s� | j d k r d S| r8 | j j j | j | | � n | j j j | j | | � | d k r� | j j j d | r{ d n d | j | j j | � n( | j j j d | r� d n d | j � | r� t
j
� | _ n | j � d | _ d S( s� Invalidate the DBAPI connection held by this :class:`._ConnectionRecord`.
This method is called for all connection invalidations, including
when the :meth:`._ConnectionFairy.invalidate` or
:meth:`.Connection.invalidate` methods are called, as well as when any
so-called "automatic invalidation" condition occurs.
:param e: an exception object indicating a reason for the invalidation.
:param soft: if True, the connection isn't closed; instead, this
connection will be recycled on next checkout.
.. versionadded:: 1.0.3
.. seealso::
:ref:`pool_connection_invalidation`
Ns* %sInvalidate connection %r (reason: %s:%s)s Soft RD s %sInvalidate connection %r(
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d d t �| r| j d | � n t | t � s � q q!Xn | rC| j d k rC| j � n d S( sf Cleanup for a :class:`._ConnectionFairy` whether or not it's already
been garbage collected.
Ns$ Connection %r being returned to pools! Exception during reset or similarRL R� ( R� t discardR R� RQ RM RN RV t _resetR. t close_detachedRR t
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RV c B s� e Z d Z d � Z d Z d Z d Z e d d d � � Z d � Z
d � Z e Z d � Z
e d � � Z e d � � Z e j d � � Z e d � � Z d e d
� Z d � Z d � Z d
� Z d � Z RS( sX Proxies a DBAPI connection and provides return-on-dereference
support.
This is an internal object used by the :class:`.Pool` implementation
to provide context management to a DBAPI connection delivered by
that :class:`.Pool`.
The name "fairy" is inspired by the fact that the
:class:`._ConnectionFairy` object's lifespan is transitory, as it lasts
only for the length of a specific DBAPI connection being checked out from
the pool, and additionally that as a transparent proxy, it is mostly
invisible.
.. seealso::
:class:`._ConnectionRecord`
c C s | | _ | | _ | | _ d S( N( RQ R[ t _echo( R R
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d � � d S( Ni s This connection is closedi i s Pool pre-ping on connection %ss; Pool pre-ping on connection %s failed, will invalidate poolso Disconnection detected on checkout, invalidating all pooled connections prior to current timestamp (reason: %r)Rb sV Disconnection detected on checkout, invalidating individual connection %s (reason: %r)s+ Reconnection attempts exhausted on checkout( RY R� t _poolt _counterR R� R} Rg RQ R t InvalidRequestErrorR. R( R� RM RN R0 R t InvalidatePoolErrorR[ t DisconnectionErrort invalidate_poolRz R` Rd R+ R~ RO R R R� ( R� Ry t threadconnsR� t attemptst resultR� R� ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyRW � sd
c C s t j | j d | �S( NR� ( RV RW R� ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyRi E s c C s> t | j | j | j d | j d | �d | _ d | _ d S( NR� ( R| RQ R[ R� R R� ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyRb H s c C s | j j r% | j j | | j � n | j t k r� | j rh | j j d | j | j r^ d n d � n | j r� | j j
� q| j j | � no | j t
k r| j r� | j j d | j | j r� d n d � n | j r� | j j � q| j j | � n d S( Ns" Connection %s rollback-on-return%ss , via agentRD s Connection %s commit-on-return%s( R. t resetR[ R* R R� RM RN RQ t _reset_agentR R0 R R R R ( R Ry ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyR� V s( c C s
| j j S( N( R� RM ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyt _loggerp s c C s
| j d k S( sb Return True if this :class:`._ConnectionFairy` still refers
to an active DBAPI connection.N( RQ R ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyR\ t s c C s
| j j S( s� Info dictionary associated with the underlying DBAPI connection
referred to by this :class:`.ConnectionFairy`, allowing user-defined
data to be associated with the connection.
The data here will follow along with the DBAPI connection including
after it is returned to the connection pool and used again
in subsequent instances of :class:`._ConnectionFairy`. It is shared
with the :attr:`._ConnectionRecord.info` and :attr:`.Connection.info`
accessors.
The dictionary associated with a particular DBAPI connection is
discarded when the connection itself is discarded.
( R[ Rz ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyRz { s c C s | j r | j j Sd Sd S( s� Info dictionary associated with the :class:`._ConnectionRecord
container referred to by this :class:`.ConnectionFairy`.
Unlike the :attr:`._ConnectionFairy.info` dictionary, the lifespan
of this dictionary is persistent across connections that are
disconnected and/or invalidated within the lifespan of a
:class:`._ConnectionRecord`.
.. versionadded:: 1.1
N( R[ R{ R ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyR{ � s
c C se | j d k r t j d � d S| j rE | j j d | d | � n | sa d | _ | j � n d S( s� Mark this connection as invalidated.
This method can be called directly, and is also called as a result
of the :meth:`.Connection.invalidate` method. When invoked,
the DBAPI connection is immediately closed and discarded from
further use by the pool. The invalidation mechanism proceeds
via the :meth:`._ConnectionRecord.invalidate` internal method.
:param e: an exception object indicating a reason for the invalidation.
:param soft: if True, the connection isn't closed; instead, this
connection will be recycled on next checkout.
.. versionadded:: 1.0.3
.. seealso::
:ref:`pool_connection_invalidation`
s. Can't invalidate an already-closed connection.NR� R� ( RQ R R R� R[ R` Rb ( R R� R� ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyR` � s
c O s | j j | | � S( s� Return a new DBAPI cursor for the underlying connection.
This method is a proxy for the ``connection.cursor()`` DBAPI
method.
( RQ t cursor( R t argst kwargs( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyR� � s c C s t | j | � S( N( R] RQ ( R t key( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyt __getattr__� s c C s� | j d k r� | j } t j | � d | _ d | _ | j j | j � | j j � | _ d | _ | j j
j r� | j j
j | j | � q� n d S( s" Separate this connection from its Pool.
This means that the connection will no longer be returned to the
pool when closed, and will instead be literally closed. The
containing ConnectionRecord is separated from the DB-API connection,
and will create a new connection when next used.
Note that any overall connection limiting constraints imposed by a
Pool implementation may be violated after a detach, as the detached
connection is removed from the pool's knowledge and control.
N( R[ R R� t removeR� RQ R� Rk Rz t copyR. t detach( R Rc ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/base.pyR� � s
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