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Implementation of the Redis protocol.
This abstract class provides a Python interface to all Redis commands
and an implementation of the Redis protocol.
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Return a Redis client object configured from the given URL
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Three URL schemes are supported:
- `redis://` creates a TCP socket connection. See more at:
<https://www.iana.org/assignments/uri-schemes/prov/redis>
- `rediss://` creates a SSL wrapped TCP socket connection. See more at:
<https://www.iana.org/assignments/uri-schemes/prov/rediss>
- ``unix://``: creates a Unix Domain Socket connection.
The username, password, hostname, path and all querystring values
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2. If using the redis:// or rediss:// schemes, the path argument
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If none of these options are specified, the default db=0 is used.
All querystring options are cast to their appropriate Python types.
Boolean arguments can be specified with string values "True"/"False"
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Initialize a new Redis client.
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This function can be used to add externally defined redis modules,
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funcname - A string containing the name of the function to create
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ex: Assume that one has a custom redis module named foomod that
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from redis import Redis
from foomodule import F
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Closes Redis client connection
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Monitor is useful for handling the MONITOR command to the redis server.
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Subscribe to channel patterns. Patterns supplied as keyword arguments
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all patterns.
r r� NZ PUNSUBSCRIBE) r# r r r r r r rp r� )r? r� r! r r= r= rA r� " s zPubSub.punsubscribec � sv |r t |d f|dd� �nd}t�|�}|�|� | jdg|�� �R � I dH }| �|�}| j�|� | j� |� |S )aR
Subscribe to channels. Channels supplied as keyword arguments expect
a channel name as the key and a callable as the value. A channel's
callable will be invoked automatically when a message is received on
that channel rather than producing a message via ``listen()`` or
``get_message()``.
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r r� NZ UNSUBSCRIBE)r# r r r r� r rp r� )r? r� r! r� r= r= rA r� F s zPubSub.unsubscribec C s8 | j r4| �| jdd�I dH �I dH }|dur |V q dS )zBListen for messages on channels this client has been subscribed toT)r N)r �handle_messager� r� r= r= rA r� T s z
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Get the next message if one is available, otherwise None.
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before returning. Timeout should be specified as a floating point
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message being returned.
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This is the equivalent of :py:meth:`redis.PubSub.run_in_thread` in
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>>> task = asyncio.create_task(pubsub.run())
To shut it down, use asyncio cancellation:
>>> task.cancel()
>>> await task
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Pipelines provide a way to transmit multiple commands to the Redis server
in one transmission. This is convenient for batch processing, such as
saving all the values in a list to Redis.
All commands executed within a pipeline are wrapped with MULTI and EXEC
calls. This guarantees all commands executed in the pipeline will be
executed atomically.
Any command raising an exception does *not* halt the execution of
subsequent commands in the pipeline. Instead, the exception is caught
and its instance is placed into the response list returned by execute().
Code iterating over the response list should be able to deal with an
instance of an exception as a potential value. In general, these will be
ResponseError exceptions, such as those raised when issuing a command
on a key of a different datatype.
> �EXEC�DISCARD�UNWATCH)rK rH r� r� c C s< || _ d | _|| _|| _|| _d| _g | _t� | _d| _ d S )NF)
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t | j�S r< )�lenrG rv r= r= rA �__len__ s zPipeline.__len__c C s dS )z1Pipeline instances should always evaluate to TrueTr= rv r= r= rA �__bool__# s zPipeline.__bool__c � s | S r< r= rv r= r= rA rJ ' s zPipeline._async_selfc � s� g | _ t� | _| jrj| jrjz&| j�d�I d H | j�� I d H W n( tyh | jrd| j�� I d H Y n0 d| _d| _ | jr�| j
� | j�I d H d | _d S )NrD F) rG r rH rF rq r� r� r& r� rI rK r� rv r= r= rA r * s zPipeline.resetc C s& | j rtd��| jr td��d| _ dS )z�
Start a transactional block of the pipeline after WATCH commands
are issued. End the transactional block with `execute`.
z"Cannot issue nested calls to MULTIz:Commands without an initial WATCH have already been issuedTN)rI r) rG rv r= r= rA �multiB s �zPipeline.multir� c O s8 | j s|d dkr(| js(| j|i |��S | j|i |��S )Nr �WATCH)rF rI �immediate_execute_command�pipeline_execute_command)r? r� r@ r= r= rA r� O s zPipeline.execute_commandc � sN |� � I dH | jr*| �� I dH td��|jr:t|t�sJ| �� I dH � dS )z�
Close the connection, reset watching state and
raise an exception if we were watching,
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Execute a command immediately, but don't auto-retry on a
ConnectionError if we're already WATCHing a variable. Used when
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MULTI is called.
r Nc s �j ��g� �R i ���S r< r� r= r� r= rA r� } s ���z4Pipeline.immediate_execute_command.<locals>.<lambda>c s �� � | �S r< )rS r� r� r= rA r� � r� )rq rK r} r� ri r� �r? r� r� r= r� rA rP l s �
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Stage a command to be executed when execute() is next called
Returns the current Pipeline object back so commands can be
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At some other point, you can then run: pipe.execute(),
which will execute all commands queued in the pipe.
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<listcomp>� r� z.Pipeline._execute_pipeline.<locals>.<listcomp>r )rY rZ rU r� r* r^ ) r? rq rV r` ra r; r� r� r8 r= r= rA �_execute_pipeline� s �" zPipeline._execute_pipeline)rV r; c C s> t |�D ]0\}}t|t�r| �||d || d � |�qd S )Nr� r )r[ r� r* r\ )r? rV r; rd re r= r= rA r^ � s
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� �� z<� j�� ���fdd�� �fdd��I dH W ��� I dH S ��� I dH 0 dS )z0Execute all the commands in the current pipelineNrW c s �� ���S r< r= r= )r� r� r` �stackr= rA r� > r� z"Pipeline.execute.<locals>.<lambda>c s �� � | �S r< )rx r� r� r= rA r� ? r� )rG rF rH rw rE rI rg ri rq rK r} r� r r ri r� r )r? r` r= )r� r� r` r? ry rA r� ( s*
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See: https://redis.io/commands/DISCARD
rC Nr' rv r= r= rA �discardD s zPipeline.discard)�namesc � s& | j rtd��| jdg|�R � I dH S )z$Watches the values at keys ``names``z"Cannot issue a WATCH after a MULTIrO N)rI r) r� )r? r{ r= r= rA r� J s zPipeline.watchc � s | j r| �d�I dH pdS )z'Unwatches all previously specified keysrD NT)rF r� rv r= r= rA �unwatchP s zPipeline.unwatch)T)1rD rE rF r� ro r r r r� r� r� r� r
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