o y\y@s~dZddlmZddlZddlZddlZddlmZddlmZddlm Z ddlm Z dd lm Z dd l m Z dd l m Z dd l mZdd l mZiZddZddZe dZe dZe dZGdddeZGddde jZGdddeZ d+ddZeZGdddeZ Gdd d eZ!Gd!d"d"eZ"Gd#d$d$eZ#Gd%d&d&eZ$Gd'd(d(eZ%Gd)d*d*eZ&dS),a{Connection pooling for DB-API connections. Provides a number of connection pool implementations for a variety of usage scenarios and thread behavior requirements imposed by the application, DB-API or database itself. Also provides a DB-API 2.0 connection proxying mechanism allowing regular DB-API connect() methods to be transparently managed by a SQLAlchemy connection pool. )dequeN)event)exc) interfaces)log)util)chop_traceback)memoized_property)queue) threadingc Ks6zt|WStyt|t|fi|YSw)aHReturn a proxy for a DB-API module that automatically pools connections. Given a DB-API 2.0 module and pool management parameters, returns a proxy for the module that will automatically pool connections, creating new connection pools for each distinct set of connection arguments sent to the decorated module's connect() function. :param module: a DB-API 2.0 database module :param poolclass: the class used by the pool module to provide pooling. Defaults to :class:`.QueuePool`. :param \**params: will be passed through to *poolclass* )proxiesKeyError setdefault_DBProxy)moduleparamsrA/var/www/html/env/lib/python3.10/site-packages/sqlalchemy/pool.pymanage&s   rcCs"tD]}|qtdS)zYRemove all current DB-API 2.0 managers. All pools and connections are disposed. N)r valuescloseclear)managerrrrclear_managers=s   rreset_rollback reset_commit reset_nonec@s0eZdZdZddZddZddZdd Zd S) _ConnDialectzpartial 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`. cC |dSN)rollbackselfdbapi_connectionrrr do_rollbackX z_ConnDialect.do_rollbackcCrr )commitr"rrr do_commit[r&z_ConnDialect.do_commitcCrr rr"rrrdo_close^r&z_ConnDialect.do_closecCstd)NzJThe ping feature requires that a dialect is passed to the connection pool.NotImplementedErrorr"rrrdo_pingasz_ConnDialect.do_pingN)__name__ __module__ __qualname____doc__r%r(r*r-rrrrrMs   rc@seZdZdZeZ          d'ddZedd Zej d d Zd d Z d dZ e ddddZddZddZd(ddZddZddZddZdd Zd!d"Zd#d$Zd%d&ZdS))Poolz)Abstract base class for connection pools.NFTc Cs |r ||_|_nd|_tj||dt|_||_||_d|_ ||_ | |_ |ddt fvr2t |_ n|dddtfvr>t|_ n|dtfvrHt|_ ntd |||_| r\|jj| dd | ra| |_|rq|D] \} } t|| | qe|rtd |D] }||qzdSdS) a^ 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, if one has already been retrieved from the pool and has not been returned yet. Offers a slight performance advantage at the cost of individual transactions by default. The :meth:`.Pool.unique_connection` method is provided to return a consistently unique connection to bypass this behavior when the flag is set. .. warning:: The :paramref:`.Pool.use_threadlocal` flag **does not affect the behavior** of :meth:`.Engine.connect`. :meth:`.Engine.connect` makes use of the :meth:`.Pool.unique_connection` method which **does not use thread local context**. To produce a :class:`.Connection` which refers to the :meth:`.Pool.connect` method, use :meth:`.Engine.contextual_connect`. Note that other SQLAlchemy connectivity systems such as :meth:`.Engine.execute` as well as the orm :class:`.Session` make use of :meth:`.Engine.contextual_connect` internally, so these functions are compatible with the :paramref:`.Pool.use_threadlocal` setting. .. seealso:: :ref:`threadlocal_strategy` - contains detail on the "threadlocal" engine strategy, which provides a more comprehensive approach to "threadlocal" connectivity for the specific use case of using :class:`.Engine` and :class:`.Connection` objects directly. :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. .. deprecated:: 0.7 :class:`.PoolListener` is deprecated in favor of the :class:`.PoolEvents` listener interface. The :paramref:`.Pool.listeners` parameter will be removed in a future release. :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 N)echoflagrr!TnoneFr'z'Invalid value for 'reset_on_return': %r)only_propagatezThe 'listeners' argument to Pool and create_engine() is deprecated and will be removed in a future release. Please refer to the PoolEvents class in conjunction with event.listen()) logging_name_orig_logging_namerinstance_loggerr local _threadconns_creator_recycle_invalidate_time_use_threadlocal _pre_pingr_reset_on_returnrrr ArgumentErrorechodispatch_update_dialectrlistenrwarn_deprecated add_listener)r#creatorrecyclerCuse_threadlocalr7reset_on_return listenerseventsdialectpre_ping _dispatchfntargetlrrr__init__nsH    z Pool.__init__cCs |jdSNr<)__dict__r#rrrr</ z Pool._creatorcCs||jd<|||_dSrW)rX_should_wrap_creator_invoke_creator)r#rJrrrr<3s csz tj|jdd}WntyfddYSw|ddur&t|dp'd}t|d|}|d|dfdgd fkr?S|d krESfd dS) zlDetect if creator accepts a single argument, or is sent as a legacy style no-arg function. T)no_selfcSr rcrecrJrrAz+Pool._should_wrap_creator..Nrconnection_recordr rcr^r rr_rarrrbPrc)rget_callable_argspecr< TypeErrorlen)r#rJargspec defaulted positionalsrrarr[8s  zPool._should_wrap_creatorcCsH|jd|z |j|WdSty#|jjd|ddYdSw)NzClosing connection %rzException closing connection %rTexc_info)loggerdebugrFr* Exceptionerror)r# connectionrrr_close_connectionRs  zPool._close_connectionz0.7zThe :meth:`.Pool.add_listener` method is deprecated and will be removed in a future release. Please use the :class:`.PoolEvents` listener interface.cCstj||dS)aAdd 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 PoolListener_adapt_listener)r#listenerrrrrI\s zPool.add_listenercCs t|S)aProduce 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. )_ConnectionFairy _checkoutrYrrrunique_connectionks zPool.unique_connectioncCt|S)z6Called by subclasses to create a new ConnectionRecord._ConnectionRecordrYrrr_create_connectionxszPool._create_connectioncCsLt|dd}|r|j|jkrt|_|r"t|ddr$||dSdSdS)aMark 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. _connection_recordNis_validF)getattrr> starttimetime invalidate)r#rr exception_checkinrecrrr _invalidate}s  zPool._invalidatecCt)aReturn 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. r+rYrrrrecreates z Pool.recreatecCr)zDispose 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` r+rYrrrdisposes z Pool.disposecCsP|jst|Sz|j}Wn tyYn w|dur!|St||jS)zReturn 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?rwrxr;currentAttributeError_checkout_existingr#rrrrconnects  z Pool.connectcCs2|jrz|j`Wn tyYnw||dS)zGiven 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;rr_do_return_conn)r#recordrrr _return_conns  zPool._return_conncCr)z7Implementation for :meth:`get`, supplied by subclasses.r+rYrrr_do_getz Pool._do_getcCr)z?Implementation for :meth:`return_conn`, supplied by subclasses.r+r#connrrrrrzPool._do_return_conncCrr r+rYrrrstatusz Pool.status) r3NFNTNNNFN)NT)r.r/r0r1rrFrVpropertyr<setterr[rsr deprecatedrIryr}rrrrrrrrrrrrr2hsF B        r2c@seZdZdZd ddZdZdZdZ dZe j ddZ e j d d Z e d d Zd dZd!ddZeddZeddZddZd"ddZddZddZd!ddZdS)#r|aInternal 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` TcCs"||_|r |jddt|_dS)NT)first_connect_check)_ConnectionRecord__pool_ConnectionRecord__connectrfinalize_callback)r#poolrrrrrVs  z_ConnectionRecord.__init__NrcCiS)aYThe ``.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. 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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` Nz*%sInvalidate connection %r (reason: %s:%s)zSoft z%sInvalidate connection %r) rrrrDsoft_invalidaterrnr __class__r.r_soft_invalidate_timerr#rsoftrrrres,    z_ConnectionRecord.invalidatecCsd}|jdur|j|nA|jjdkr.t|j|jjkr.|jjd|jd}n$|jj |jkrA|jjd|jd}n|j |jkrR|jjd|jd}|ra| |j||jS)NFr3z)Connection %r exceeded timeout; recyclingTz=Connection %r invalidated due to pool invalidation; recyclingzCConnection %r invalidated due to local soft invalidation; recycling) rrrrrrr=rrrnr>rr)r#rKrrrrs6      z _ConnectionRecord.get_connectioncCs>|j|jjjr|jj|j||j|jd|_dSr )rrrrDrrrrsrYrrr__closes   z_ConnectionRecord.__closec Cs|j}d|_zt|_||}|jd|||_Wnty0}z|jd|d}~ww|r@|jj |j |j||jj rN|j |j|dSdS)NzCreated new connection %rzError on connect(): %s) rrrrrr\rnrorprD first_connect for_modify exec_oncer)r#rrrrrrrr __connects(    z_ConnectionRecord.__connect)T)FNF)r.r/r0r1rVrrrrrrr rr classmethodrrrrrrrrrrrrrrrr|s2        /#r|c Cst||dur|j|urdS|dusJ|j}|durx|r(|r(|jd|z'|p0t|||}|j|us8J|||sN|jj rI|j || |Wn(t yw}z|jj ddd|rg|j |dt|tsmWYd}~nd}~ww|r|jdur|dSdSdS)zfCleanup for a :class:`._ConnectionFairy` whether or not it's already been garbage collected. Nz$Connection %r being returned to poolz!Exception during reset or similarTrlr)rdiscardrrrrnrorw_resetrDclose_detachedrs BaseExceptionrqr isinstancerpr)rrrerrrCrrrrrrsH          rc@seZdZdZddZdZ dZ dZ ed ddZ ddZ d d Z e Z d d Z ed dZeddZejddZeddZd!ddZddZddZddZddZdS)"rwaXProxies a DBAPI connection and provides return-on-dereference support. This is an internal object used by the :class:`.Pool` implementation to provide context management to a DBAPI connection delivered by that :class:`.Pool`. The name "fairy" is inspired by the fact that the :class:`._ConnectionFairy` object's lifespan is transitory, as it lasts only for the length of a specific DBAPI connection being checked out from the pool, and additionally that as a transparent proxy, it is mostly invisible. .. seealso:: :class:`._ConnectionRecord` cCs||_||_||_dSr )rrr~_echo)r#r$rerCrrrrVs z_ConnectionFairy.__init__NcCs|st|}||_d|_|durt||_|jdur!t d|jd7_|j js/|j r4|jdkr6|Sd}|dkrz3|j rc|j rK|j d|j|j|j}|sc|j r_|j d|jt|j |j|j||WStjy}zg|jr|j d||j||j||dd n|j d |j||j|z|j|_Wn,ty}z t|j|Wdn1swYWYd}~nd}~ww|d8}WYd}~nd}~ww|dks<|j d |t d) NrzThis connection is closedrzPool pre-ping on connection %sz;Pool pre-ping on connection %s failed, will invalidate poolzoDisconnection detected on checkout, invalidating all pooled connections prior to current timestamp (reason: %r)F)rzVDisconnection detected on checkout, invalidating individual connection %s (reason: %r)z+Reconnection attempts exhausted on checkout)r|r_pool_counterrrrrrrInvalidRequestErrorrDr@rrnrorFr-InvalidatePoolErrorr~DisconnectionErrorinvalidate_poolrrrrrprrr)rr threadconnsrattemptsresultrrrrrrx<s          2 z_ConnectionFairy._checkoutcCstj|j|dSN)r)rwrxrrYrrrrsz#_ConnectionFairy._checkout_existingcCs,t|j|j|jd|j|dd|_d|_dSr)rrrr~rrrYrrrrs z_ConnectionFairy._checkincCs|jjr |j||j|jtur4|jr"|jd|j|j rdnd|j r,|j dS|j |dS|jt ur\|jrJ|jd|j|j rGdnd|j rT|j dS|j |dSdS)Nz"Connection %s rollback-on-return%sz , via agentrz Connection %s commit-on-return%s)rDresetr~rArrrnrorr _reset_agentr!rFr%rr'r()r#rrrrrs.    z_ConnectionFairy._resetcC|jjSr )rrnrYrrr_loggerz_ConnectionFairy._loggercCs |jduS)zbReturn True if this :class:`._ConnectionFairy` still refers to an active DBAPI connection.NrrrYrrrrs z_ConnectionFairy.is_validcCr)aInfo 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~rrYrrrrsz_ConnectionFairy.infocCs|jr|jjSdS)aInfo 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~rrYrrrrs z_ConnectionFairy.record_infoFcCsH|jdur tddS|jr|jj||d|s"d|_|dSdS)aMark 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` Nz.Can't invalidate an already-closed connection.)rr)rrrrr~rrrrrrrs   z_ConnectionFairy.invalidatecOs|jj|i|S)zReturn a new DBAPI cursor for the underlying connection. This method is a proxy for the ``connection.cursor()`` DBAPI method. )rrcursor)r#argskwargsrrrrsz_ConnectionFairy.cursorcC t|j|Sr )rrrr#keyrrr __getattr__r&z_ConnectionFairy.__getattr__cCsn|jdur3|j}t|d|_d|_|j|j|j|_d|_|jj j r5|jj |j|dSdSdS)a"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~rremoverrrrrrcopyrDdetachrrrrrs     z_ConnectionFairy.detachcCs(|jd8_|jdkr|dSdS)Nrr)rrrYrrrr+s  z_ConnectionFairy.close)NNr)r.r/r0r1rVrrr~rrrxrr_closerrrrrr rrrrrrrrrrrrws8 O        rwc@sJeZdZdZdddZddZddZd d Zd d Zd dZ ddZ dS)SingletonThreadPoolaA Pool that maintains one connection per thread. Maintains one connection per each thread, never moving a connection to a thread other than the one which it was created in. .. warning:: the :class:`.SingletonThreadPool` will call ``.close()`` on arbitrary connections that exist beyond the size setting of ``pool_size``, e.g. if more unique **thread identities** than what ``pool_size`` states are used. This cleanup is non-deterministic and not sensitive to whether or not the connections linked to those thread identities are currently in use. :class:`.SingletonThreadPool` may be improved in a future release, however in its current status it is generally used only for test scenarios using a SQLite ``:memory:`` database and is not recommended for production use. Options are the same as those of :class:`.Pool`, as well as: :param pool_size: The number of threads in which to maintain connections at once. Defaults to five. :class:`.SingletonThreadPool` is used by the SQLite dialect automatically when a memory-based database is used. See :ref:`sqlite_toplevel`. cKs8d|d<tj||fi|t|_t|_||_dS)NTrL)r2rVr r:_connset _all_connssize)r#rJ pool_sizekwrrrrVPs   zSingletonThreadPool.__init__c Cs:|jd|j|j|j|j|j|j|j|j |j |j d S)NPool recreating)rrKrCr7rLrMrRrP) rnrrr<rr=rCr8r?rArDrFrYrrrrWs zSingletonThreadPool.recreatec Cs8|jD]}z|WqtyYqw|jdS)zDispose of this pool.N)rrrprrrrrres   zSingletonThreadPool.disposecCs:t|j|jkr|j}|t|j|jksdSdSr )rhrrrrr#crrr_cleanuprs zSingletonThreadPool._cleanupcCsdt|t|jfS)Nz"SingletonThreadPool id:%d size: %d)idrhrrYrrrrwszSingletonThreadPool.statuscCdSr rrrrrr}z#SingletonThreadPool._do_return_conncCsjz |j}|r |WSWn tyYnw|}t||j_t|j|jkr-| |j ||Sr ) rrrr}rrrhrrrrrrrrrs   zSingletonThreadPool._do_getN)r) r.r/r0r1rVrrrrrrrrrrr1s   rc@steZdZdZ dddZddZd d Zd d Zd dZddZ ddZ ddZ ddZ ddZ ddZddZdS) QueuePoolzA :class:`.Pool` that imposes a limit on the number of open connections. :class:`.QueuePool` is the default pooling implementation used for all :class:`.Engine` objects, unless the SQLite dialect is in use. r cKsDtj||fi|t||_d||_||_||_t |_ dS)a Construct a QueuePool. :param creator: a callable function that returns a DB-API connection object, same as that of :paramref:`.Pool.creator`. :param pool_size: The size of the pool to be maintained, defaults to 5. This is the largest number of connections that will be kept persistently in the pool. Note that the pool begins with no connections; once this number of connections is requested, that number of connections will remain. ``pool_size`` can be set to 0 to indicate no size limit; to disable pooling, use a :class:`~sqlalchemy.pool.NullPool` instead. :param max_overflow: The maximum overflow size of the pool. When the number of checked-out connections reaches the size set in pool_size, additional connections will be returned up to this limit. When those additional connections are returned to the pool, they are disconnected and discarded. It follows then that the total number of simultaneous connections the pool will allow is pool_size + `max_overflow`, and the total number of "sleeping" connections the pool will allow is pool_size. `max_overflow` can be set to -1 to indicate no overflow limit; no limit will be placed on the total number of concurrent connections. Defaults to 10. :param timeout: The number of seconds to wait before giving up on returning a connection. Defaults to 30. :param \**kw: Other keyword arguments including :paramref:`.Pool.recycle`, :paramref:`.Pool.echo`, :paramref:`.Pool.reset_on_return` and others are passed to the :class:`.Pool` constructor. rN) r2rV sqla_queueQueuer _overflow _max_overflow_timeoutr Lock_overflow_lock)r#rJr max_overflowtimeoutrrrrrVs (  zQueuePool.__init__c CsJz |j|dWdStjy$z |W|YdS|wwr)rputrFullr _dec_overflowrrrrrs zQueuePool._do_return_connc Cs|jdk}z|o |j|jk}|j||jWStjy Ynw|r@|j|jkr@|s/|Stj d| | |jfdd| rjz| WSt|WdYdS1sbwYYdS|S)Nr3zPQueuePool limit of size %d overflow %d reached, connection timed out, timeout %d3o7r)code)rrrgetrrEmptyrr TimeoutErrorroverflow _inc_overflowr}rrr )r# use_overflowwaitrrrrs0    &zQueuePool._do_getcCsv|jdkr|jd7_dS|j |j|jkr(|jd7_ WddS WddS1s4wYdS)Nr3rTFrrrrYrrrrs  $zQueuePool._inc_overflowcCsX|jdkr|jd8_dS|j|jd8_ WddS1s%wYdS)Nr3rTrrYrrrr s $zQueuePool._dec_overflowc CsD|jd|j|j|jj|j|j|j|j |j |j |j |j |jd S)Nr) rrrrKrCr7rLrMrRrP)rnrrr<rmaxsizerrr=rCr8r?rArDrFrYrrrrs zQueuePool.recreatecCsV z |jd}|Wn tjyYnwqd||_|jd| dS)NTFrzPool disposed. %s) rr rrrrrrnrrrrrrrs  zQueuePool.disposecCs d||||fS)Nz_Pool size: %d Connections in pool: %d Current Overflow: %d Current Checked out connections: %d)r checkedinr checkedoutrYrrrrszQueuePool.statuscCrr )rrrYrrrr*zQueuePool.sizecCs |jSr )rqsizerYrrrr-s zQueuePool.checkedincCrr )rrYrrrr0rzQueuePool.overflowcCs|jj|j|jSr )rrrrrYrrrr3szQueuePool.checkedoutN)rrr)r.r/r0r1rVrrrr rrrrrrrrrrrrs /     rc@s8eZdZdZddZddZddZdd Zd d Zd S) NullPoolaQA Pool which does not pool connections. Instead it literally opens and closes the underlying DB-API connection per each connection open/close. Reconnect-related functions such as ``recycle`` and connection invalidation are not supported by this Pool implementation, since no connections are held persistently. cCdS)NrrrYrrrrDrzNullPool.statuscCrr r)rrrrrGr&zNullPool._do_return_conncC|Sr )r}rYrrrrJrzNullPool._do_getc C6|jd|j|j|j|j|j|j|j|j |j dS)Nr)rKrCr7rLrMrRrP) rnrrr<r=rCr8r?rArDrFrYrrrrMs zNullPool.recreatecCrr rrYrrrr[rzNullPool.disposeN) r.r/r0r1rrrrrrrrrr7s  rc@sXeZdZdZeddZeddZddZdd Zd d Z d d Z ddZ ddZ dS) StaticPoola.A Pool of exactly one connection, used for all requests. Reconnect-related functions such as ``recycle`` and connection invalidation (which is also used to support auto-reconnect) are not currently supported by this Pool implementation but may be implemented in a future release. cCrr )r<rYrrrrjrzStaticPool._conncCrzr r{rYrrrrrnrzStaticPool.connectioncCr)NrrrYrrrrrrzStaticPool.statuscCs"d|jvr|jd|_dSdS)Nr)rXrrrYrrrrus   zStaticPool.disposec Cr)Nr)rJrKrLrMrCr7rRrP) rnrrr<r=r?rArCr8rDrFrYrrrrzs zStaticPool.recreatecCrr )rrYrrrr}rzStaticPool._create_connectioncCrr rrrrrrrzStaticPool._do_return_conncCrr rrYrrrrrzStaticPool._do_getN) r.r/r0r1r rrrrrrr}rrrrrrr_s    rc@s@eZdZdZddZddZddZdd Zd d Zd d Z dS) AssertionPoolaA :class:`.Pool` that allows at most one checked out connection at any given time. This will raise an exception if more than one connection is checked out at a time. Useful for debugging code that is using more connections than desired. cOs<d|_d|_|dd|_d|_tj|g|Ri|dS)NFstore_tracebackT)r _checked_outr_store_traceback_checkout_tracebackr2rVr#rrrrrrVs zAssertionPool.__init__cCr)NrrrYrrrrrzAssertionPool.statuscCs&|jstdd|_||jusJdS)Nzconnection is not checked outF)r!AssertionErrorrrrrrrszAssertionPool._do_return_conncCsd|_|jr |jdSdSr)r!rrrYrrrrszAssertionPool.disposecCs*|jd|j|j|j|j|j|jdS)Nr)rCr7rRrP)rnrrr<rCr8rDrFrYrrrrs zAssertionPool.recreatecCs^|jr|jrddt|j}nd}td||js!||_d|_|jr,t |_|jS)Nz at: %srz!connection is already checked outT) r!r#joinr r%rr}r" traceback format_stack)r#suffixrrrrs   zAssertionPool._do_getN) r.r/r0r1rVrrrrrrrrrrs  rc@sTeZdZdZefddZddZddZdd Zd d Z d d Z ddZ ddZ dS)ra Layers connection pooling behavior on top of a standard DB-API module. Proxies a DB-API 2.0 connect() call to a connection pool keyed to the specific connect parameters. Other functions and attributes are delegated to the underlying DB-API module. cKs&||_||_||_i|_t|_dS)zInitializes a new proxy. module a DB-API 2.0 module poolclass a Pool class, defaulting to QueuePool Other parameters are sent to the Pool object's constructor. N)rr poolclasspoolsr r_create_pool_mutex)r#rr*rrrrrVs  z_DBProxy.__init__cCst|jD]}|j|=qdSr )listr+rrrrrs z_DBProxy.closecCs |dSr r)rYrrr__del__r&z_DBProxy.__del__cCrr )rrrrrrrr&z_DBProxy.__getattr__c sji}zj|WStyXjz7|jvrEddjfddfij}|j|<|WjYSj|WjYSjww)N sa_pool_keycsjjiSr )rrrrrr#rrrbsz#_DBProxy.get_pool..) _serializer+rr,acquirerr*rrelease)r#rrrrrr0rget_pools&       z_DBProxy.get_poolcOs|j|i|S)a,Activate a connection to the database. Connect to the database using this DBProxy's module and the given connect arguments. If the arguments match an existing pool, the connection will be returned from the pool's current thread-local connection instance, or if there is no thread-local connection instance it will be checked out from the set of pooled connections. If the pool has no available connections and allows new connections to be created, a new database connection will be made. )r4rr$rrrrsz_DBProxy.connectcOs4|j|i|}z|j|=WdStyYdSw)z;Dispose the pool referenced by the given connect arguments.N)r1r+r)r#rrrrrrrs  z_DBProxy.disposecs2dvrdStt|fddtDS)Nr/csg|]}||fqSrr).0krrr $sz'_DBProxy._serialize..)tupler-sortedr$rr7rr1 s"z_DBProxy._serializeN) r.r/r0r1rrVrr.rr4rrr1rrrrrs  rr )'r1 collectionsrrr'rrrrrrrr r r rr r rrsymbolrrrobjectr Identifiedr2r|rrrrwrrrrrrrrrrsN            t} .-^)(2=