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편집 파일: impl.cpython-38.pyc
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G d d � d e�Z"G d d � d e"�Z#G d d!� d!e#�Z$G d"d#� d#e�Z%G d$d%� d%e�Z&G d&d'� d'e�Z'G d(d)� d)e�Z(dS )*z Pool implementation classes. � )� annotationsN)�Any)�cast)�List)�Optional)�Set)�Type)� TYPE_CHECKING)�Union� )�_AsyncConnDialect)�_ConnectionFairy��_ConnectionRecord)�_CreatorFnType)�_CreatorWRecFnType)�ConnectionPoolEntry)�Pool)�PoolProxiedConnection� )�exc)�util)�chop_traceback)�queue)�Literal)�DBAPIConnectionc @ s� e Zd ZU dZdZejZded< ded< d1d d d d d dd�dd�Z ddd�dd�Z dd�dd�Z d d�dd�Z d d�d d �Z d d�d d �Zdd�d!d"�Zd#d�d$d%�Zd d�d&d'�Zd d�d(d)�Zd d�d*d+�Zd d�d,d-�Zd d�d.d/�Zd0S )2� QueuePoolaO A :class:`_pool.Pool` that imposes a limit on the number of open connections. :class:`.QueuePool` is the default pooling implementation used for all :class:`_engine.Engine` objects other than SQLite with a ``:memory:`` database. The :class:`.QueuePool` class **is not compatible** with asyncio and :func:`_asyncio.create_async_engine`. The :class:`.AsyncAdaptedQueuePool` class is used automatically when using :func:`_asyncio.create_async_engine`, if no other kind of pool is specified. .. seealso:: :class:`.AsyncAdaptedQueuePool` F�1Type[sqla_queue.QueueCommon[ConnectionPoolEntry]]� _queue_classz+sqla_queue.QueueCommon[ConnectionPoolEntry]�_pool� � � >@�)Union[_CreatorFnType, _CreatorWRecFnType]�int�float�boolr )�creator� pool_size� max_overflow�timeout�use_lifo�kwc K sP t j| |f|� | j||d�| _d| | _|dkr6dn|| _|| _t�� | _ dS )a� Construct a QueuePool. :param creator: a callable function that returns a DB-API connection object, same as that of :paramref:`_pool.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 30.0. This can be a float but is subject to the limitations of Python time functions which may not be reliable in the tens of milliseconds. :param use_lifo: use LIFO (last-in-first-out) when retrieving connections instead of FIFO (first-in-first-out). Using LIFO, a server-side timeout scheme can reduce the number of connections used during non-peak periods of use. When planning for server-side timeouts, ensure that a recycle or pre-ping strategy is in use to gracefully handle stale connections. .. versionadded:: 1.3 .. seealso:: :ref:`pool_use_lifo` :ref:`pool_disconnects` :param \**kw: Other keyword arguments including :paramref:`_pool.Pool.recycle`, :paramref:`_pool.Pool.echo`, :paramref:`_pool.Pool.reset_on_return` and others are passed to the :class:`_pool.Pool` constructor. )r+ r ���N) r �__init__r r � _overflow� _max_overflow�_timeout� threading�Lock�_overflow_lock)�selfr' r( r) r* r+ r, � r6 �D/opt/hc_python/lib64/python3.8/site-packages/sqlalchemy/pool/impl.pyr. I s @ zQueuePool.__init__r �None��record�returnc C sF z| j �|d� W n. tjk r@ z |�� W 5 | �� X Y nX d S �NF)r �put� sqla_queue�Full� _dec_overflow�close�r5 r: r6 r6 r7 �_do_return_conn� s zQueuePool._do_return_conn�r; c C s� | j dk}|o| j| j k}z| j�|| j�W S tjk rB Y nX |r�| j| j kr�|s`| �� S tj d| � � | � � | jf dd��| � � r�z | � � W S t�� � | �� W 5 Q R X � Y q�X n| �� S d S )Nr- zSQueuePool limit of size %d overflow %d reached, connection timed out, timeout %0.2fZ3o7r)�code)r0 r/ r �getr1 r> �Empty�_do_getr � TimeoutError�size�overflow� _inc_overflow�_create_connectionr Z safe_reraiser@ )r5 Z use_overflow�waitr6 r6 r7 rH � s. �� zQueuePool._do_getc C sh | j dkr | jd7 _dS | j�< | j| j k rL| jd7 _W 5 Q R � dS W 5 Q R � dS W 5 Q R X d S )Nr- r TF�r0 r/ r4 �r5 r6 r6 r7 rL � s zQueuePool._inc_overflowz Literal[True]c C sJ | j dkr | jd8 _dS | j� | jd8 _W 5 Q R � dS Q R X d S )Nr- r TrO rP r6 r6 r7 r@ � s zQueuePool._dec_overflowc C sJ | j �d� | j| j| jj| j| j| jj| j | j | j | j | j | j| jd� S )N�Pool recreating) r( r) �pre_pingr+ r* �recycle�echo� logging_name�reset_on_return� _dispatch�dialect)�logger�info� __class__�_creatorr �maxsizer0 � _pre_pingr+ r1 �_recyclerT �_orig_logging_name�_reset_on_return�dispatch�_dialectrP r6 r6 r7 �recreate� s �zQueuePool.recreatec C sZ z| j �d�}|�� W q tjk r2 Y q6Y q X q d| �� | _| j�d| � � � d S )NFr zPool disposed. %s) r rF rA r> rG rJ r/ rY rZ �status�r5 �connr6 r6 r7 �dispose� s zQueuePool.dispose�strc C s d| � � | �� | �� | �� f S )Nz_Pool size: %d Connections in pool: %d Current Overflow: %d Current Checked out connections: %d)rJ � checkedinrK � checkedoutrP r6 r6 r7 re � s ���zQueuePool.statusc C s | j jS �N)r r] rP r6 r6 r7 rJ � s zQueuePool.sizec C s | j S rl )r1 rP r6 r6 r7 r* � s zQueuePool.timeoutc C s | j �� S rl )r �qsizerP r6 r6 r7 rj � s zQueuePool.checkedinc C s | j jr| jS dS )Nr )r r] r/ rP r6 r6 r7 rK � s zQueuePool.overflowc C s | j j| j �� | j S rl )r r] rm r/ rP r6 r6 r7 rk s zQueuePool.checkedoutN)r r! r" F)�__name__� __module__� __qualname__�__doc__� _is_asyncior> �Queuer �__annotations__r. rC rH rL r@ rd rh re rJ r* rj rK rk r6 r6 r6 r7 r - s, � �G r c @ s* e Zd ZU dZdZejZded< e � Z dS )�AsyncAdaptedQueuePoola� An asyncio-compatible version of :class:`.QueuePool`. This pool is used by default when using :class:`.AsyncEngine` engines that were generated from :func:`_asyncio.create_async_engine`. It uses an asyncio-compatible queue implementation that does not use ``threading.Lock``. The arguments and operation of :class:`.AsyncAdaptedQueuePool` are otherwise identical to that of :class:`.QueuePool`. Tr r N) rn ro rp rq rr r> ZAsyncAdaptedQueuer rt r rc r6 r6 r6 r7 ru s � ru c @ s e Zd ZejZdS )� FallbackAsyncAdaptedQueuePoolN)rn ro rp r> ZFallbackAsyncAdaptedQueuer r6 r6 r6 r7 rv s rv c @ sX e Zd ZdZdd�dd�Zddd�d d �Zdd�d d �Zd d�d d�Zdd�dd�ZdS )�NullPoola� A 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. The :class:`.NullPool` class **is compatible** with asyncio and :func:`_asyncio.create_async_engine`. ri rD c C s dS )Nrw r6 rP r6 r6 r7 re - s zNullPool.statusr r8 r9 c C s |� � d S rl )rA rB r6 r6 r7 rC 0 s zNullPool._do_return_connc C s | � � S rl )rM rP r6 r6 r7 rH 3 s zNullPool._do_getc C s6 | j �d� | j| j| j| j| j| j| j| j | j d�S )NrQ )rS rT rU rV rR rW rX ) rY rZ r[ r\ r_ rT r` ra r^ rb rc rP r6 r6 r7 rd 6 s �zNullPool.recreatec C s d S rl r6 rP r6 r6 r7 rh D s zNullPool.disposeN) rn ro rp rq re rC rH rd rh r6 r6 r6 r7 rw s rw c @ s� e Zd ZdZdZd dddd�dd �Zd d �d d �Zd d �dd�Zd d �dd�Zdd �dd�Z dd d�dd�Z dd �dd�Z dd �d d �Z d S ) �SingletonThreadPoola' A 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. The :class:`.SingletonThreadPool` class **is not compatible** with asyncio and :func:`_asyncio.create_async_engine`. Options are the same as those of :class:`_pool.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`. Fr r# r$ r )r' r( r, c K s6 t j| |f|� t�� | _t�� | _t� | _|| _d S rl ) r r. r2 �local�_conn�_fairy�set� _all_connsrJ )r5 r' r( r, r6 r6 r7 r. k s z SingletonThreadPool.__init__rD c C s: | j �d� | j| j| j| j| j| j| j| j | j | j d� S )NrQ )r( rS rT rR rU rV rW rX ) rY rZ r[ r\ rJ r_ rT r^ r` ra rb rc rP r6 r6 r7 rd w s �z SingletonThreadPool.recreater8 c C s< | j D ]&}z |�� W q tk r* Y qX q| j �� dS )zDispose of this pool.N)r} rA � Exception�clearrf r6 r6 r7 rh � s zSingletonThreadPool.disposec C s( t | j�| jkr$| j�� }|�� q d S rl )�lenr} rJ �poprA �r5 �cr6 r6 r7 �_cleanup� s z SingletonThreadPool._cleanupri c C s dt | �t| j�f S )Nz"SingletonThreadPool id:%d size: %d)�idr� r} rP r6 r6 r7 re � s �zSingletonThreadPool.statusr r9 c C s$ z | j `W n tk r Y nX d S rl )r{ �current�AttributeErrorrB r6 r6 r7 rC � s z#SingletonThreadPool._do_return_connc C s� z.t rtt| j�� �}n | j�� }|r,|W S W n tk rB Y nX | �� }t�|�| j_t | j �| j krr| � � | j � |� |S rl )r r r rz r� r� rM �weakref�refr� r} rJ r� �addr� r6 r6 r7 rH � s zSingletonThreadPool._do_getr c C sH zt t| j�� �}W n tk r( Y nX |d k r:|�� S t�| | j�S rl )r r r{ r� r� Z_checkout_existingZ _checkout�r5 �recr6 r6 r7 �connect� s zSingletonThreadPool.connectN)r ) rn ro rp rq rr r. rd rh r� re rC rH r� r6 r6 r6 r7 rx H s � rx c @ s� e Zd ZdZejdd�dd��Zdd�dd�Zd d�d d �Zd d�d d �Z d d d�dd�Z dd�dd�Z dd d�dd�Z dd�dd�Z 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 only partially supported right now and may not yield good results. The :class:`.StaticPool` class **is compatible** with asyncio and :func:`_asyncio.create_async_engine`. r rD c C s t | �S rl r rP r6 r6 r7 � connection� s zStaticPool.connectionri c C s dS )Nr� r6 rP r6 r6 r7 re � s zStaticPool.statusr8 c C s, d| j kr(| jjd k r(| j�� | j d= d S �Nr� )�__dict__r� �dbapi_connectionrA rP r6 r6 r7 rh � s � � zStaticPool.disposec C s6 | j �d� | j| j| j| j| j| j| j| j | j d�S )NrQ )r' rS rV rR rT rU rW rX ) rY rZ r[ r\ r_ ra r^ rT r` rb rc rP r6 r6 r7 rd � s �zStaticPool.recreate)�other_static_poolr; c s ddd�� fdd� }|| _ d S )Nr r )r� r; c s � j j}|d k st�|S rl )r� r� �AssertionError)r� rg �r� r6 r7 r' � s z*StaticPool._transfer_from.<locals>.creator)Z_invoke_creator)r5 r� r' r6 r� r7 �_transfer_from� s zStaticPool._transfer_fromr c C s t � �d S rl )�NotImplementedErrorrP r6 r6 r7 rM � s z StaticPool._create_connectionr9 c C s d S rl r6 rB r6 r6 r7 rC � s zStaticPool._do_return_connc C s | j }|�� r | jd= | j }|S r� )r� Z _is_hard_or_soft_invalidatedr� r� r6 r6 r7 rH � s zStaticPool._do_getN)rn ro rp rq r Zmemoized_propertyr� re rh rd r� rM rC rH r6 r6 r6 r7 r� � s r� c @ sz e Zd ZU dZded< ded< ddd�dd �Zd d �d d �Zddd�dd�Zdd �dd�Zd d �dd�Z dd �dd�Z dS )� AssertionPoola} A :class:`_pool.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. The :class:`.AssertionPool` class **is compatible** with asyncio and :func:`_asyncio.create_async_engine`. z Optional[ConnectionPoolEntry]rz zOptional[List[str]]�_checkout_tracebackr )�argsr, c O s6 d | _ d| _|�dd�| _d | _tj| f|�|� d S )NFZstore_tracebackT)rz � _checked_outr� �_store_tracebackr� r r. )r5 r� r, r6 r6 r7 r. s zAssertionPool.__init__ri rD c C s dS )Nr� r6 rP r6 r6 r7 re s zAssertionPool.statusr r8 r9 c C s& | j std��d| _ || jks"t�d S )Nz connection is not checked outF)r� r� rz rB r6 r6 r7 rC s z AssertionPool._do_return_connc C s d| _ | jr| j�� d S r< )r� rz rA rP r6 r6 r7 rh # s zAssertionPool.disposec C s6 | j �d� | j| j| j| j| j| j| j| j | j d�S )NrQ )rT rR rS rV rU rW rX ) rY rZ r[ r\ rT r^ r_ ra r` rb rc rP r6 r6 r7 rd ( s �zAssertionPool.recreatec C s^ | j r2| jr"dd�t| j�� }nd}td| ��| jsB| �� | _d| _ | jrXt� � | _| jS )Nz at: %s� z!connection is already checked outT) r� r� �joinr r� rz rM r� � traceback� format_stack)r5 �suffixr6 r6 r7 rH 5 s � zAssertionPool._do_getN) rn ro rp rq rt r. re rC rh rd rH r6 r6 r6 r7 r� s r� ))rq � __future__r r2 r� �typingr r r r r r r r r� �baser r r r r r r r r� r r r r r> Z util.typingr Zengine.interfacesr r ru rv rw rx r� r� r6 r6 r6 r7 �<module> sH Y*zA