API Reference

aio_pika.AMQPException

alias of aiormq.exceptions.AMQPError

class aio_pika.Channel(connection: aiormq.abc.AbstractConnection, channel_number: Optional[int] = None, publisher_confirms: bool = True, on_return_raises: bool = False)

Channel abstraction

Parameters

• connection – aio_pika.adapter.AsyncioConnection instance

• loop – Event loop (asyncio.get_event_loop() when None)

• future_store – aio_pika.common.FutureStore instance

• publisher_confirms – False if you don’t need delivery confirmations (in pursuit of performance)

EXCHANGE_CLASS

alias of aio_pika.exchange.Exchange

QUEUE_CLASS

alias of aio_pika.queue.Queue

async declare_exchange(name: str, type: Union[aio_pika.abc.ExchangeType, str] = ExchangeType.DIRECT, *, durable: bool = False, auto_delete: bool = False, internal: bool = False, passive: bool = False, arguments: Optional[Dict[str, FieldValue]] = None, timeout: Optional[Union[float, int]] = None) → aio_pika.abc.AbstractExchange

Declare an exchange.

Parameters

• name – string with exchange name or aio_pika.exchange.Exchange instance

• type – Exchange type. Enum ExchangeType value or string. String values must be one of ‘fanout’, ‘direct’, ‘topic’, ‘headers’, ‘x-delayed-message’, ‘x-consistent-hash’.

• durable – Durability (exchange survive broker restart)

• auto_delete – Delete queue when channel will be closed.

• internal – Do not send it to broker just create an object

• passive – Do not fail when entity was declared previously but has another params. Raises aio_pika.exceptions.ChannelClosed when exchange doesn’t exist.

• arguments – additional arguments

• timeout – execution timeout

Returns

aio_pika.exchange.Exchange instance

async declare_queue(name: str = None, *, durable: bool = False, exclusive: bool = False, passive: bool = False, auto_delete: bool = False, arguments: Optional[Dict[str, FieldValue]] = None, timeout: Optional[Union[float, int]] = None) → aio_pika.abc.AbstractQueue

Parameters

• name – queue name

• durable – Durability (queue survive broker restart)

• exclusive – Makes this queue exclusive. Exclusive queues may only be accessed by the current connection, and are deleted when that connection closes. Passive declaration of an exclusive queue by other connections are not allowed.

• passive – Do not fail when entity was declared previously but has another params. Raises aio_pika.exceptions.ChannelClosed when queue doesn’t exist.

• auto_delete – Delete queue when channel will be closed.

• arguments – additional arguments

• timeout – execution timeout

Returns

aio_pika.queue.Queue instance

Raises

aio_pika.exceptions.ChannelClosed instance

async get_exchange(name: str, *, ensure: bool = True) → aio_pika.abc.AbstractExchange

With ensure=True, it’s a shortcut for .declare_exchange(..., passive=True); otherwise, it returns an exchange instance without checking its existence.

When the exchange does not exist, if ensure=True, will raise aio_pika.exceptions.ChannelClosed.

Use this method in a separate channel (or as soon as channel created). This is only a way to get an exchange without declaring a new one.

Parameters

• name – exchange name

• ensure – ensure that the exchange exists

Returns

aio_pika.exchange.Exchange instance

Raises

aio_pika.exceptions.ChannelClosed instance

async get_queue(name: str, *, ensure: bool = True) → aio_pika.abc.AbstractQueue

With ensure=True, it’s a shortcut for .declare_queue(..., passive=True); otherwise, it returns a queue instance without checking its existence.

When the queue does not exist, if ensure=True, will raise aio_pika.exceptions.ChannelClosed.

Use this method in a separate channel (or as soon as channel created). This is only a way to get a queue without declaring a new one.

Parameters

• name – queue name

• ensure – ensure that the queue exists

Returns

aio_pika.queue.Queue instance

Raises

aio_pika.exceptions.ChannelClosed instance

property is_closed: bool

Returns True when the channel has been closed from the broker side or after the close() method has been called.

property is_initialized: bool

Returns True when the channel has been opened and ready for interaction

class aio_pika.Connection(url: yarl.URL, loop: Optional[asyncio.events.AbstractEventLoop] = None, **kwargs: Any)

Connection abstraction

CHANNEL_CLASS

alias of aio_pika.channel.Channel

channel(channel_number: Optional[int] = None, publisher_confirms: bool = True, on_return_raises: bool = False) → aio_pika.abc.AbstractChannel

Coroutine which returns new instance of Channel.

Example:

import aio_pika

async def main(loop):
    connection = await aio_pika.connect(
        "amqp://guest:guest@127.0.0.1/"
    )

    channel1 = connection.channel()
    await channel1.close()

    # Creates channel with specific channel number
    channel42 = connection.channel(42)
    await channel42.close()

    # For working with transactions
    channel_no_confirms = await connection.channel(
        publisher_confirms=False
    )
    await channel_no_confirms.close()

Also available as an asynchronous context manager:

import aio_pika

async def main(loop):
    connection = await aio_pika.connect(
        "amqp://guest:guest@127.0.0.1/"
    )

    async with connection.channel() as channel:
        # channel is open and available

    # channel is now closed

Parameters

• channel_number – specify the channel number explicit

• publisher_confirms – if True the aio_pika.Exchange.publish() method will be return bool after publish is complete. Otherwise the aio_pika.Exchange.publish() method will be return None

• on_return_raises – raise an aio_pika.exceptions.DeliveryError when mandatory message will be returned

async connect(timeout: Optional[Union[float, int]] = None) → None

Connect to AMQP server. This method should be called after aio_pika.connection.Connection.__init__()

Note

This method is called by connect(). You shouldn’t call it explicitly.

class aio_pika.DeliveryMode(value)

An enumeration.

class aio_pika.Exchange(channel: aiormq.abc.AbstractChannel, name: str, type: Union[aio_pika.abc.ExchangeType, str] = ExchangeType.DIRECT, *, auto_delete: bool = False, durable: bool = False, internal: bool = False, passive: bool = False, arguments: Optional[Dict[str, FieldValue]] = None)

Exchange abstraction

async bind(exchange: Union[AbstractExchange, str], routing_key: str = '', *, arguments: Optional[Dict[str, FieldValue]] = None, timeout: Optional[Union[float, int]] = None) → pamqp.commands.Exchange.BindOk

A binding can also be a relationship between two exchanges. This can be simply read as: this exchange is interested in messages from another exchange.

Bindings can take an extra routing_key parameter. To avoid the confusion with a basic_publish parameter we’re going to call it a binding key.

client = await connect()

routing_key = 'simple_routing_key'
src_exchange_name = "source_exchange"
dest_exchange_name = "destination_exchange"

channel = await client.channel()
src_exchange = await channel.declare_exchange(
    src_exchange_name, auto_delete=True
)
dest_exchange = await channel.declare_exchange(
    dest_exchange_name, auto_delete=True
)
queue = await channel.declare_queue(auto_delete=True)

await queue.bind(dest_exchange, routing_key)
await dest_exchange.bind(src_exchange, routing_key)

Parameters

• exchange – aio_pika.exchange.Exchange instance

• routing_key – routing key

• arguments – additional arguments

• timeout – execution timeout

Returns

None

async delete(if_unused: bool = False, timeout: Optional[Union[float, int]] = None) → pamqp.commands.Exchange.DeleteOk

Delete the queue

Parameters

• timeout – operation timeout

• if_unused – perform deletion when queue has no bindings.

async publish(message: aio_pika.abc.AbstractMessage, routing_key: str, *, mandatory: bool = True, immediate: bool = False, timeout: Optional[Union[float, int]] = None) → Optional[Union[pamqp.commands.Basic.Ack, pamqp.commands.Basic.Nack, pamqp.commands.Basic.Reject]]

Publish the message to the queue. aio-pika uses publisher confirms extension for message delivery.

async unbind(exchange: Union[AbstractExchange, str], routing_key: str = '', arguments: Optional[Dict[str, FieldValue]] = None, timeout: Optional[Union[float, int]] = None) → pamqp.commands.Exchange.UnbindOk

Remove exchange-to-exchange binding for this Exchange instance

Parameters

• exchange – aio_pika.exchange.Exchange instance

• routing_key – routing key

• arguments – additional arguments

• timeout – execution timeout

Returns

None

class aio_pika.ExchangeType(value)

An enumeration.

class aio_pika.IncomingMessage(message: aiormq.abc.DeliveredMessage, no_ack: bool = False)

Incoming message is seems like Message but has additional methods for message acknowledgement.

Depending on the acknowledgement mode used, RabbitMQ can consider a message to be successfully delivered either immediately after it is sent out (written to a TCP socket) or when an explicit (“manual”) client acknowledgement is received. Manually sent acknowledgements can be positive or negative and use one of the following protocol methods:

• basic.ack is used for positive acknowledgements

• basic.nack is used for negative acknowledgements (note: this is a RabbitMQ extension to AMQP 0-9-1)

• basic.reject is used for negative acknowledgements but has one limitations compared to basic.nack

Positive acknowledgements simply instruct RabbitMQ to record a message as delivered. Negative acknowledgements with basic.reject have the same effect. The difference is primarily in the semantics: positive acknowledgements assume a message was successfully processed while their negative counterpart suggests that a delivery wasn’t processed but still should be deleted.

Create an instance of IncomingMessage

async ack(multiple: bool = False) → None

Send basic.ack is used for positive acknowledgements

Note

This method looks like a blocking-method, but actually it just sends bytes to the socket and doesn’t require any responses from the broker.

Parameters

multiple – If set to True, the message’s delivery tag is treated as “up to and including”, so that multiple messages can be acknowledged with a single method. If set to False, the ack refers to a single message.

Returns

None

info() → dict

Method returns dict representation of the message

process(requeue: bool = False, reject_on_redelivered: bool = False, ignore_processed: bool = False) → aio_pika.abc.AbstractProcessContext

Context manager for processing the message

>>> async def on_message_received(message: IncomingMessage):
...    async with message.process():
...        # When exception will be raised
...        # the message will be rejected
...        print(message.body)

Example with ignore_processed=True

>>> async def on_message_received(message: IncomingMessage):
...    async with message.process(ignore_processed=True):
...        # Now (with ignore_processed=True) you may reject
...        # (or ack) message manually too
...        if True:  # some reasonable condition here
...            await message.reject()
...        print(message.body)

Parameters

• requeue – Requeue message when exception.

• reject_on_redelivered – When True message will be rejected only when message was redelivered.

• ignore_processed – Do nothing if message already processed

async reject(requeue: bool = False) → None

When requeue=True the message will be returned to queue. Otherwise message will be dropped.

Note

This method looks like a blocking-method, but actually it just sends bytes to the socket and doesn’t require any responses from the broker.

Parameters

requeue – bool

class aio_pika.Message(body: bytes, *, headers: Optional[MutableMapping[str, Union[bool, bytearray, decimal.Decimal, List[Union[bool, bytearray, decimal.Decimal, List[FieldValue], Dict[str, FieldValue], float, int, None, str, datetime.datetime]], Dict[str, Union[bool, bytearray, decimal.Decimal, List[FieldValue], Dict[str, FieldValue], float, int, None, str, datetime.datetime]], float, int, None, str, datetime.datetime, bytes, Set[Union[bool, bytearray, decimal.Decimal, List[Union[bool, bytearray, decimal.Decimal, List[FieldValue], Dict[str, FieldValue], float, int, None, str, datetime.datetime]], Dict[str, Union[bool, bytearray, decimal.Decimal, List[FieldValue], Dict[str, FieldValue], float, int, None, str, datetime.datetime]], float, int, None, str, datetime.datetime, bytes]], Tuple[Union[bool, bytearray, decimal.Decimal, List[Union[bool, bytearray, decimal.Decimal, List[FieldValue], Dict[str, FieldValue], float, int, None, str, datetime.datetime]], Dict[str, Union[bool, bytearray, decimal.Decimal, List[FieldValue], Dict[str, FieldValue], float, int, None, str, datetime.datetime]], float, int, None, str, datetime.datetime, bytes], ...], FrozenSet[Union[bool, bytearray, decimal.Decimal, List[Union[bool, bytearray, decimal.Decimal, List[FieldValue], Dict[str, FieldValue], float, int, None, str, datetime.datetime]], Dict[str, Union[bool, bytearray, decimal.Decimal, List[FieldValue], Dict[str, FieldValue], float, int, None, str, datetime.datetime]], float, int, None, str, datetime.datetime, bytes]]]]] = None, content_type: Optional[str] = None, content_encoding: Optional[str] = None, delivery_mode: Optional[Union[aio_pika.abc.DeliveryMode, int]] = None, priority: Optional[int] = None, correlation_id: Optional[str] = None, reply_to: Optional[str] = None, expiration: Optional[Union[int, datetime.datetime, float, datetime.timedelta]] = None, message_id: Optional[str] = None, timestamp: Optional[Union[int, datetime.datetime, float, datetime.timedelta]] = None, type: Optional[str] = None, user_id: Optional[str] = None, app_id: Optional[str] = None)

AMQP message abstraction

Creates a new instance of Message

Parameters

• body – message body

• headers – message headers

• headers_raw – message raw headers

• content_type – content type

• content_encoding – content encoding

• delivery_mode – delivery mode

• priority – priority

• correlation_id – correlation id

• reply_to – reply to

• expiration – expiration in seconds (or datetime or timedelta)

• message_id – message id

• timestamp – timestamp

• type – type

• user_id – user id

• app_id – app id

info() → dict

Create a dict with message attributes

{
    "body_size": 100,
    "headers": {},
    "content_type": "text/plain",
    "content_encoding": "",
    "delivery_mode": DeliveryMode.NOT_PERSISTENT,
    "priority": 0,
    "correlation_id": "",
    "reply_to": "",
    "expiration": "",
    "message_id": "",
    "timestamp": "",
    "type": "",
    "user_id": "",
    "app_id": "",
}

lock() → None

Set lock flag to True

property locked: bool

is message locked

Returns

bool

property properties: pamqp.commands.Basic.Properties

Build aiormq.spec.Basic.Properties object

exception aio_pika.MessageProcessError

class aio_pika.Queue(channel: aiormq.abc.AbstractChannel, name: Optional[str], durable: bool, exclusive: bool, auto_delete: bool, arguments: Optional[Dict[str, FieldValue]], passive: bool = False)

AMQP queue abstraction

async bind(exchange: Union[AbstractExchange, str], routing_key: str = None, *, arguments: Optional[Dict[str, FieldValue]] = None, timeout: Optional[Union[float, int]] = None) → pamqp.commands.Queue.BindOk

A binding is a relationship between an exchange and a queue. This can be simply read as: the queue is interested in messages from this exchange.

Bindings can take an extra routing_key parameter. To avoid the confusion with a basic_publish parameter we’re going to call it a binding key.

Parameters

• exchange – aio_pika.exchange.Exchange instance

• routing_key – routing key

• arguments – additional arguments

• timeout – execution timeout

Raises

asyncio.TimeoutError – when the binding timeout period has elapsed.

Returns

None

async cancel(consumer_tag: str, timeout: Optional[Union[float, int]] = None, nowait: bool = False) → pamqp.commands.Basic.CancelOk

This method cancels a consumer. This does not affect already delivered messages, but it does mean the server will not send any more messages for that consumer. The client may receive an arbitrary number of messages in between sending the cancel method and receiving the cancel-ok reply. It may also be sent from the server to the client in the event of the consumer being unexpectedly cancelled (i.e. cancelled for any reason other than the server receiving the corresponding basic.cancel from the client). This allows clients to be notified of the loss of consumers due to events such as queue deletion.

Parameters

• consumer_tag – consumer tag returned by consume()

• timeout – execution timeout

• nowait (bool) – Do not expect a Basic.CancelOk response

Returns

Basic.CancelOk when operation completed successfully

async consume(callback: Callable[[aio_pika.abc.AbstractIncomingMessage], Any], no_ack: bool = False, exclusive: bool = False, arguments: Optional[Dict[str, FieldValue]] = None, consumer_tag: str = None, timeout: Optional[Union[float, int]] = None) → str

Start to consuming the Queue.

Parameters

• timeout – asyncio.TimeoutError will be raises when the Future was not finished after this time.

• callback – Consuming callback. Could be a coroutine.

• no_ack – if True you don’t need to call aio_pika.message.IncomingMessage.ack()

• exclusive – Makes this queue exclusive. Exclusive queues may only be accessed by the current connection, and are deleted when that connection closes. Passive declaration of an exclusive queue by other connections are not allowed.

• arguments – additional arguments

• consumer_tag – optional consumer tag

Raises

asyncio.TimeoutError – when the consuming timeout period has elapsed.

Return str

consumer tag str

async declare(timeout: Optional[Union[float, int]] = None) → pamqp.commands.Queue.DeclareOk

Declare queue.

Parameters

• timeout – execution timeout

• passive – Only check to see if the queue exists.

Returns

None

async delete(*, if_unused: bool = True, if_empty: bool = True, timeout: Optional[Union[float, int]] = None) → pamqp.commands.Queue.DeleteOk

Delete the queue.

Parameters

• if_unused – Perform delete only when unused

• if_empty – Perform delete only when empty

• timeout – execution timeout

Returns

None

async get(*, no_ack: bool = False, fail: bool = True, timeout: Optional[Union[float, int]] = 5) → Optional[aio_pika.message.IncomingMessage]

Get message from the queue.

Parameters

• no_ack – if True you don’t need to call aio_pika.message.IncomingMessage.ack()

• timeout – execution timeout

• fail – Should return None instead of raise an exception aio_pika.exceptions.QueueEmpty.

Returns

aio_pika.message.IncomingMessage

iterator(**kwargs: Any) → aio_pika.abc.AbstractQueueIterator

Returns an iterator for async for expression.

Full example:

import aio_pika

async def main():
    connection = await aio_pika.connect()

    async with connection:
        channel = await connection.channel()

        queue = await channel.declare_queue('test')

        async with queue.iterator() as q:
            async for message in q:
                print(message.body)

When your program runs with run_forever the iterator will be closed in background. In this case the context processor for iterator might be skipped and the queue might be used in the “async for” expression directly.

import aio_pika

async def main():
    connection = await aio_pika.connect()

    async with connection:
        channel = await connection.channel()

        queue = await channel.declare_queue('test')

        async for message in queue:
            print(message.body)

Returns

QueueIterator

async purge(no_wait: bool = False, timeout: Optional[Union[float, int]] = None) → pamqp.commands.Queue.PurgeOk

Purge all messages from the queue.

Parameters

• no_wait – no wait response

• timeout – execution timeout

Returns

None

async unbind(exchange: Union[AbstractExchange, str], routing_key: str = None, arguments: Optional[Dict[str, FieldValue]] = None, timeout: Optional[Union[float, int]] = None) → pamqp.commands.Queue.UnbindOk

Remove binding from exchange for this Queue instance

Parameters

• exchange – aio_pika.exchange.Exchange instance

• routing_key – routing key

• arguments – additional arguments

• timeout – execution timeout

Raises

asyncio.TimeoutError – when the unbinding timeout period has elapsed.

Returns

None

class aio_pika.RobustChannel(connection: aiormq.abc.AbstractConnection, channel_number: Optional[int] = None, publisher_confirms: bool = True, on_return_raises: bool = False)

Channel abstraction

Parameters

• connection – aio_pika.adapter.AsyncioConnection instance

• loop – Event loop (asyncio.get_event_loop() when None)

• future_store – aio_pika.common.FutureStore instance

• publisher_confirms – False if you don’t need delivery confirmations (in pursuit of performance)

EXCHANGE_CLASS

alias of aio_pika.robust_exchange.RobustExchange

QUEUE_CLASS

alias of aio_pika.robust_queue.RobustQueue

async declare_exchange(name: str, type: Union[aio_pika.abc.ExchangeType, str] = ExchangeType.DIRECT, durable: bool = False, auto_delete: bool = False, internal: bool = False, passive: bool = False, arguments: Optional[dict] = None, timeout: Optional[Union[float, int]] = None, robust: bool = True) → aio_pika.abc.AbstractRobustExchange

Declare an exchange.

Parameters

• name – string with exchange name or aio_pika.exchange.Exchange instance

• type – Exchange type. Enum ExchangeType value or string. String values must be one of ‘fanout’, ‘direct’, ‘topic’, ‘headers’, ‘x-delayed-message’, ‘x-consistent-hash’.

• durable – Durability (exchange survive broker restart)

• auto_delete – Delete queue when channel will be closed.

• internal – Do not send it to broker just create an object

• passive – Do not fail when entity was declared previously but has another params. Raises aio_pika.exceptions.ChannelClosed when exchange doesn’t exist.

• arguments – additional arguments

• timeout – execution timeout

Returns

aio_pika.exchange.Exchange instance

async declare_queue(name: Optional[str] = None, *, durable: bool = False, exclusive: bool = False, passive: bool = False, auto_delete: bool = False, arguments: Optional[dict] = None, timeout: Optional[Union[float, int]] = None, robust: bool = True) → aio_pika.abc.AbstractRobustQueue

Parameters

• name – queue name

• durable – Durability (queue survive broker restart)

• exclusive – Makes this queue exclusive. Exclusive queues may only be accessed by the current connection, and are deleted when that connection closes. Passive declaration of an exclusive queue by other connections are not allowed.

• passive – Do not fail when entity was declared previously but has another params. Raises aio_pika.exceptions.ChannelClosed when queue doesn’t exist.

• auto_delete – Delete queue when channel will be closed.

• arguments – additional arguments

• timeout – execution timeout

Returns

aio_pika.queue.Queue instance

Raises

aio_pika.exceptions.ChannelClosed instance

class aio_pika.RobustConnection(url: yarl.URL, loop: Optional[asyncio.events.AbstractEventLoop] = None, **kwargs: Any)

Robust connection

CHANNEL_CLASS

alias of aio_pika.robust_channel.RobustChannel

channel(channel_number: Optional[int] = None, publisher_confirms: bool = True, on_return_raises: bool = False) → aio_pika.abc.AbstractRobustChannel

Coroutine which returns new instance of Channel.

Example:

import aio_pika

async def main(loop):
    connection = await aio_pika.connect(
        "amqp://guest:guest@127.0.0.1/"
    )

    channel1 = connection.channel()
    await channel1.close()

    # Creates channel with specific channel number
    channel42 = connection.channel(42)
    await channel42.close()

    # For working with transactions
    channel_no_confirms = await connection.channel(
        publisher_confirms=False
    )
    await channel_no_confirms.close()

Also available as an asynchronous context manager:

import aio_pika

async def main(loop):
    connection = await aio_pika.connect(
        "amqp://guest:guest@127.0.0.1/"
    )

    async with connection.channel() as channel:
        # channel is open and available

    # channel is now closed

Parameters

• channel_number – specify the channel number explicit

• publisher_confirms – if True the aio_pika.Exchange.publish() method will be return bool after publish is complete. Otherwise the aio_pika.Exchange.publish() method will be return None

• on_return_raises – raise an aio_pika.exceptions.DeliveryError when mandatory message will be returned

async connect(timeout: Optional[Union[float, int]] = None) → None

Connect to AMQP server. This method should be called after aio_pika.connection.Connection.__init__()

Note

This method is called by connect(). You shouldn’t call it explicitly.

class aio_pika.RobustExchange(channel: aiormq.abc.AbstractChannel, name: str, type: Union[aio_pika.abc.ExchangeType, str] = ExchangeType.DIRECT, *, auto_delete: bool = False, durable: bool = False, internal: bool = False, passive: bool = False, arguments: Optional[Dict[str, FieldValue]] = None)

Exchange abstraction

async bind(exchange: Union[AbstractExchange, str], routing_key: str = '', *, arguments: Optional[Dict[str, FieldValue]] = None, timeout: Optional[Union[float, int]] = None, robust: bool = True) → pamqp.commands.Exchange.BindOk

A binding can also be a relationship between two exchanges. This can be simply read as: this exchange is interested in messages from another exchange.

Bindings can take an extra routing_key parameter. To avoid the confusion with a basic_publish parameter we’re going to call it a binding key.

client = await connect()

routing_key = 'simple_routing_key'
src_exchange_name = "source_exchange"
dest_exchange_name = "destination_exchange"

channel = await client.channel()
src_exchange = await channel.declare_exchange(
    src_exchange_name, auto_delete=True
)
dest_exchange = await channel.declare_exchange(
    dest_exchange_name, auto_delete=True
)
queue = await channel.declare_queue(auto_delete=True)

await queue.bind(dest_exchange, routing_key)
await dest_exchange.bind(src_exchange, routing_key)

Parameters

• exchange – aio_pika.exchange.Exchange instance

• routing_key – routing key

• arguments – additional arguments

• timeout – execution timeout

Returns

None

async unbind(exchange: Union[AbstractExchange, str], routing_key: str = '', arguments: Optional[Dict[str, FieldValue]] = None, timeout: Optional[Union[float, int]] = None) → pamqp.commands.Exchange.UnbindOk

Remove exchange-to-exchange binding for this Exchange instance

Parameters

• exchange – aio_pika.exchange.Exchange instance

• routing_key – routing key

• arguments – additional arguments

• timeout – execution timeout

Returns

None

class aio_pika.RobustQueue(channel: aiormq.abc.AbstractChannel, name: Optional[str], durable: bool = False, exclusive: bool = False, auto_delete: bool = False, arguments: Optional[Dict[str, FieldValue]] = None, passive: bool = False)

async bind(exchange: Union[AbstractExchange, str], routing_key: str = None, *, arguments: Optional[Dict[str, FieldValue]] = None, timeout: Optional[Union[float, int]] = None, robust: bool = True) → pamqp.commands.Queue.BindOk

A binding is a relationship between an exchange and a queue. This can be simply read as: the queue is interested in messages from this exchange.

Bindings can take an extra routing_key parameter. To avoid the confusion with a basic_publish parameter we’re going to call it a binding key.

Parameters

• exchange – aio_pika.exchange.Exchange instance

• routing_key – routing key

• arguments – additional arguments

• timeout – execution timeout

Raises

asyncio.TimeoutError – when the binding timeout period has elapsed.

Returns

None

async cancel(consumer_tag: str, timeout: Optional[Union[float, int]] = None, nowait: bool = False) → pamqp.commands.Basic.CancelOk

This method cancels a consumer. This does not affect already delivered messages, but it does mean the server will not send any more messages for that consumer. The client may receive an arbitrary number of messages in between sending the cancel method and receiving the cancel-ok reply. It may also be sent from the server to the client in the event of the consumer being unexpectedly cancelled (i.e. cancelled for any reason other than the server receiving the corresponding basic.cancel from the client). This allows clients to be notified of the loss of consumers due to events such as queue deletion.

Parameters

• consumer_tag – consumer tag returned by consume()

• timeout – execution timeout

• nowait (bool) – Do not expect a Basic.CancelOk response

Returns

Basic.CancelOk when operation completed successfully

async consume(callback: Callable[[aio_pika.abc.AbstractIncomingMessage], Any], no_ack: bool = False, exclusive: bool = False, arguments: Optional[Dict[str, FieldValue]] = None, consumer_tag: str = None, timeout: Optional[Union[float, int]] = None, robust: bool = True) → str

Start to consuming the Queue.

Parameters

• timeout – asyncio.TimeoutError will be raises when the Future was not finished after this time.

• callback – Consuming callback. Could be a coroutine.

• no_ack – if True you don’t need to call aio_pika.message.IncomingMessage.ack()

• exclusive – Makes this queue exclusive. Exclusive queues may only be accessed by the current connection, and are deleted when that connection closes. Passive declaration of an exclusive queue by other connections are not allowed.

• arguments – additional arguments

• consumer_tag – optional consumer tag

Raises

asyncio.TimeoutError – when the consuming timeout period has elapsed.

Return str

consumer tag str

iterator(**kwargs: Any) → aio_pika.abc.AbstractQueueIterator

Returns an iterator for async for expression.

Full example:

import aio_pika

async def main():
    connection = await aio_pika.connect()

    async with connection:
        channel = await connection.channel()

        queue = await channel.declare_queue('test')

        async with queue.iterator() as q:
            async for message in q:
                print(message.body)

When your program runs with run_forever the iterator will be closed in background. In this case the context processor for iterator might be skipped and the queue might be used in the “async for” expression directly.

import aio_pika

async def main():
    connection = await aio_pika.connect()

    async with connection:
        channel = await connection.channel()

        queue = await channel.declare_queue('test')

        async for message in queue:
            print(message.body)

Returns

QueueIterator

async unbind(exchange: Union[AbstractExchange, str], routing_key: str = None, arguments: Optional[Dict[str, FieldValue]] = None, timeout: Optional[Union[float, int]] = None) → pamqp.commands.Queue.UnbindOk

Remove binding from exchange for this Queue instance

Parameters

• exchange – aio_pika.exchange.Exchange instance

• routing_key – routing key

• arguments – additional arguments

• timeout – execution timeout

Raises

asyncio.TimeoutError – when the unbinding timeout period has elapsed.

Returns

None

async aio_pika.connect(url: typing.Union[str, yarl.URL] = None, *, host: str = 'localhost', port: int = 5672, login: str = 'guest', password: str = 'guest', virtualhost: str = '/', ssl: bool = False, loop: asyncio.events.AbstractEventLoop = None, ssl_options: dict = None, timeout: typing.Optional[typing.Union[float, int]] = None, client_properties: typing.Dict[str, FieldValue] = None, connection_class: typing.Type[aio_pika.abc.AbstractConnection] = <class 'aio_pika.connection.Connection'>, **kwargs: typing.Any) → aio_pika.abc.AbstractConnection

Make connection to the broker.

Example:

import aio_pika

async def main():
    connection = await aio_pika.connect(
        "amqp://guest:guest@127.0.0.1/"
    )

Connect to localhost with default credentials:

import aio_pika

async def main():
    connection = await aio_pika.connect()

Note

The available keys for ssl_options parameter are:

• cert_reqs

• certfile

• keyfile

• ssl_version

For an information on what the ssl_options can be set to reference the official Python documentation .

Set connection name for RabbitMQ admin panel:

read_connection = await connect(
    client_properties={
        'connection_name': 'Read connection'
    }
)

write_connection = await connect(
    client_properties={
        'connection_name': 'Write connection'
    }
)

URL string might be contain ssl parameters e.g. amqps://user:pass@host//?ca_certs=ca.pem&certfile=crt.pem&keyfile=key.pem

Parameters

• client_properties – add custom client capability.

• url – RFC3986 formatted broker address. When None will be used keyword arguments.

• host – hostname of the broker

• port – broker port 5672 by default

• login – username string. ‘guest’ by default.

• password – password string. ‘guest’ by default.

• virtualhost – virtualhost parameter. ‘/’ by default

• ssl – use SSL for connection. Should be used with addition kwargs.

• ssl_options – A dict of values for the SSL connection.

• timeout – connection timeout in seconds

• loop – Event loop (asyncio.get_event_loop() when None)

• connection_class – Factory of a new connection

• kwargs – addition parameters which will be passed to the connection.

Returns

aio_pika.connection.Connection

async aio_pika.connect_robust(url: typing.Union[str, yarl.URL] = None, *, host: str = 'localhost', port: int = 5672, login: str = 'guest', password: str = 'guest', virtualhost: str = '/', ssl: bool = False, loop: asyncio.events.AbstractEventLoop = None, ssl_options: dict = None, timeout: typing.Optional[typing.Union[float, int]] = None, client_properties: typing.Dict[str, FieldValue] = None, connection_class: typing.Type[aio_pika.abc.AbstractRobustConnection] = <class 'aio_pika.robust_connection.RobustConnection'>, **kwargs: typing.Any) → aio_pika.abc.AbstractRobustConnection

Make connection to the broker.

Example:

import aio_pika

async def main():
    connection = await aio_pika.connect(
        "amqp://guest:guest@127.0.0.1/"
    )

Connect to localhost with default credentials:

import aio_pika

async def main():
    connection = await aio_pika.connect()

Note

The available keys for ssl_options parameter are:

• cert_reqs

• certfile

• keyfile

• ssl_version

For an information on what the ssl_options can be set to reference the official Python documentation .

Set connection name for RabbitMQ admin panel:

read_connection = await connect(
    client_properties={
        'connection_name': 'Read connection'
    }
)

write_connection = await connect(
    client_properties={
        'connection_name': 'Write connection'
    }
)

URL string might be contain ssl parameters e.g. amqps://user:pass@host//?ca_certs=ca.pem&certfile=crt.pem&keyfile=key.pem

Parameters

• client_properties – add custom client capability.

• url – RFC3986 formatted broker address. When None will be used keyword arguments.

• host – hostname of the broker

• port – broker port 5672 by default

• login – username string. ‘guest’ by default.

• password – password string. ‘guest’ by default.

• virtualhost – virtualhost parameter. ‘/’ by default

• ssl – use SSL for connection. Should be used with addition kwargs.

• ssl_options – A dict of values for the SSL connection.

• timeout – connection timeout in seconds

• loop – Event loop (asyncio.get_event_loop() when None)

• connection_class – Factory of a new connection

• kwargs – addition parameters which will be passed to the connection.

Returns

aio_pika.connection.Connection

aio_pika.patterns.base

alias of <module ‘aio_pika.patterns.base’ from ‘/build/python-aio-pika-GeMu3Q/python-aio-pika-8.0.3/aio_pika/patterns/base.py’>

class aio_pika.patterns.Master(channel: aio_pika.abc.AbstractChannel, requeue: bool = True, reject_on_redelivered: bool = False)

Implements Master/Worker pattern. Usage example:

worker.py

master = Master(channel)
worker = await master.create_worker('test_worker', lambda x: print(x))

master.py

master = Master(channel)
await master.proxy.test_worker('foo')

Creates a new Master instance.

Parameters

channel – Initialized instance of aio_pika.Channel

async create_task(channel_name: str, kwargs: Mapping[str, Any] = mappingproxy({}), **message_kwargs: Any) → Optional[Union[pamqp.commands.Basic.Ack, pamqp.commands.Basic.Nack, pamqp.commands.Basic.Reject]]

Creates a new task for the worker

async create_worker(channel_name: str, func: Callable[[...], Any], **kwargs: Any) → aio_pika.patterns.master.Worker

Creates a new Worker instance.

deserialize(data: bytes) → Any

Deserialize data from bytes. Uses pickle by default. You should overlap this method when you want to change serializer

Parameters

data – Data which will be deserialized

Returns

Any

serialize(data: Any) → bytes

Serialize data to the bytes. Uses pickle by default. You should overlap this method when you want to change serializer

Parameters

data – Data which will be serialized

Returns

bytes

class aio_pika.patterns.Worker(queue: aio_pika.abc.AbstractQueue, consumer_tag: str, loop: asyncio.events.AbstractEventLoop)

close() → Awaitable[None]

Cancel subscription to the channel

Returns

asyncio.Task

class aio_pika.patterns.RPC(channel: aio_pika.abc.AbstractChannel)

Remote Procedure Call helper.

Create an instance

rpc = await RPC.create(channel)

Registering python function

# RPC instance passes only keyword arguments
def multiply(*, x, y):
    return x * y

await rpc.register("multiply", multiply)

Call function through proxy

assert await rpc.proxy.multiply(x=2, y=3) == 6

Call function explicit

assert await rpc.call('multiply', dict(x=2, y=3)) == 6

async call(method_name: str, kwargs: Optional[Dict[str, Any]] = None, *, expiration: Optional[int] = None, priority: int = 5, delivery_mode: aio_pika.abc.DeliveryMode = DeliveryMode.NOT_PERSISTENT) → Any

Call remote method and awaiting result.

Parameters

• method_name – Name of method

• kwargs – Methos kwargs

• expiration – If not None messages which staying in queue longer will be returned and asyncio.TimeoutError will be raised.

• priority – Message priority

• delivery_mode – Call message delivery mode

Raises

• asyncio.TimeoutError – when message expired

• CancelledError – when called RPC.cancel()

• RuntimeError – internal error

async classmethod create(channel: aio_pika.abc.AbstractChannel, **kwargs: Any) → aio_pika.patterns.rpc.RPC

Creates a new instance of aio_pika.patterns.RPC. You should use this method instead of __init__(), because create() returns coroutine and makes async initialize

Parameters

channel – initialized instance of aio_pika.Channel

Returns

RPC

async execute(func: Callable[[...], aio_pika.patterns.rpc.T], payload: Dict[str, Any]) → aio_pika.patterns.rpc.T

Executes rpc call. Might be overlapped.

async register(method_name: str, func: Callable[[...], aio_pika.patterns.rpc.T], **kwargs: Any) → Any

Method creates a queue with name which equal of method_name argument. Then subscribes this queue.

Parameters

• method_name – Method name

• func – target function. Function MUST accept only keyword arguments.

• kwargs – arguments which will be passed to queue_declare

Raises

RuntimeError – Function already registered in this RPC instance or method_name already used.

serialize_exception(exception: Exception) → Any

Make python exception serializable

async unregister(func: Callable[[...], aio_pika.patterns.rpc.T]) → None

Cancels subscription to the method-queue.

Parameters

func – Function