# --------------------------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See License.txt in the project root for license information.
# --------------------------------------------------------------------------------------------
import asyncio
import logging
from typing import Any, Union, TYPE_CHECKING, List, Optional, Dict, cast
from uamqp import constants
from ..exceptions import ConnectError, EventHubError
from ._client_base_async import ClientBaseAsync
from ._producer_async import EventHubProducer
from .._constants import ALL_PARTITIONS
from .._common import EventDataBatch, EventData
if TYPE_CHECKING:
from uamqp.constants import TransportType
from azure.core.credentials import TokenCredential
_LOGGER = logging.getLogger(__name__)
[docs]class EventHubProducerClient(ClientBaseAsync):
"""
The EventHubProducerClient class defines a high level interface for
sending events to the Azure Event Hubs service.
:param str fully_qualified_namespace: The fully qualified host name for the Event Hubs namespace.
This is likely to be similar to <yournamespace>.servicebus.windows.net
:param str eventhub_name: The path of the specific Event Hub to connect the client to.
:param ~azure.core.credentials.TokenCredential credential: The credential object used for authentication which
implements a particular interface for getting tokens. It accepts
:class:`EventHubSharedKeyCredential<azure.eventhub.aio.EventHubSharedKeyCredential>`, or credential objects
generated by the azure-identity library and objects that implement the `get_token(self, *scopes)` method.
:keyword bool logging_enable: Whether to output network trace logs to the logger. Default is `False`.
:keyword float auth_timeout: The time in seconds to wait for a token to be authorized by the service.
The default value is 60 seconds. If set to 0, no timeout will be enforced from the client.
:keyword str user_agent: The user agent that should be appended to the built-in user agent string.
:keyword int retry_total: The total number of attempts to redo a failed operation when an error occurs. Default
value is 3.
:keyword float idle_timeout: Timeout, in seconds, after which this client will close the underlying connection
if there is no activity. By default the value is None, meaning that the client will not shutdown due to inactivity
unless initiated by the service.
:keyword transport_type: The type of transport protocol that will be used for communicating with
the Event Hubs service. Default is `TransportType.Amqp`.
:paramtype transport_type: ~azure.eventhub.TransportType
:keyword dict http_proxy: HTTP proxy settings. This must be a dictionary with the following
keys: `'proxy_hostname'` (str value) and `'proxy_port'` (int value).
Additionally the following keys may also be present: `'username', 'password'`.
.. admonition:: Example:
.. literalinclude:: ../samples/async_samples/sample_code_eventhub_async.py
:start-after: [START create_eventhub_producer_client_async]
:end-before: [END create_eventhub_producer_client_async]
:language: python
:dedent: 4
:caption: Create a new instance of the EventHubProducerClient.
"""
def __init__(
self,
fully_qualified_namespace: str,
eventhub_name: str,
credential: "TokenCredential",
**kwargs
) -> None:
super(EventHubProducerClient, self).__init__(
fully_qualified_namespace=fully_qualified_namespace,
eventhub_name=eventhub_name,
credential=credential,
network_tracing=kwargs.pop("logging_enable", False),
**kwargs
)
self._producers = {
ALL_PARTITIONS: self._create_producer()
} # type: Dict[str, Optional[EventHubProducer]]
self._lock = asyncio.Lock(
loop=self._loop
) # sync the creation of self._producers
self._max_message_size_on_link = 0
self._partition_ids = None # Optional[List[str]]
async def __aenter__(self):
return self
async def __aexit__(self, *args):
await self.close()
async def _get_partitions(self) -> None:
if not self._partition_ids:
self._partition_ids = await self.get_partition_ids() # type: ignore
for p_id in cast(List[str], self._partition_ids):
self._producers[p_id] = None
async def _get_max_mesage_size(self) -> None:
# pylint: disable=protected-access,line-too-long
async with self._lock:
if not self._max_message_size_on_link:
await cast(
EventHubProducer, self._producers[ALL_PARTITIONS]
)._open_with_retry()
self._max_message_size_on_link = (
cast( # type: ignore
EventHubProducer, self._producers[ALL_PARTITIONS]
)._handler.message_handler._link.peer_max_message_size
or constants.MAX_MESSAGE_LENGTH_BYTES
)
async def _start_producer(
self, partition_id: str, send_timeout: Optional[Union[int, float]]
) -> None:
async with self._lock:
await self._get_partitions()
if (
partition_id not in cast(List[str], self._partition_ids)
and partition_id != ALL_PARTITIONS
):
raise ConnectError(
"Invalid partition {} for the event hub {}".format(
partition_id, self.eventhub_name
)
)
if (
not self._producers[partition_id]
or cast(EventHubProducer, self._producers[partition_id]).closed
):
self._producers[partition_id] = self._create_producer(
partition_id=partition_id, send_timeout=send_timeout
)
def _create_producer(
self,
*,
partition_id: Optional[str] = None,
send_timeout: Optional[Union[int, float]] = None
) -> EventHubProducer:
target = "amqps://{}{}".format(self._address.hostname, self._address.path)
send_timeout = (
self._config.send_timeout if send_timeout is None else send_timeout
)
handler = EventHubProducer(
self,
target,
partition=partition_id,
send_timeout=send_timeout,
idle_timeout=self._idle_timeout,
loop=self._loop,
)
return handler
[docs] @classmethod
def from_connection_string(
cls,
conn_str: str,
*,
eventhub_name: Optional[str] = None,
logging_enable: bool = False,
http_proxy: Optional[Dict[str, Union[str, int]]] = None,
auth_timeout: float = 60,
user_agent: Optional[str] = None,
retry_total: int = 3,
transport_type: Optional["TransportType"] = None,
**kwargs: Any
) -> "EventHubProducerClient":
"""Create an EventHubProducerClient from a connection string.
:param str conn_str: The connection string of an Event Hub.
:keyword str eventhub_name: The path of the specific Event Hub to connect the client to.
:keyword bool logging_enable: Whether to output network trace logs to the logger. Default is `False`.
:keyword dict http_proxy: HTTP proxy settings. This must be a dictionary with the following
keys: `'proxy_hostname'` (str value) and `'proxy_port'` (int value).
Additionally the following keys may also be present: `'username', 'password'`.
:keyword float auth_timeout: The time in seconds to wait for a token to be authorized by the service.
The default value is 60 seconds. If set to 0, no timeout will be enforced from the client.
:keyword str user_agent: The user agent that should be appended to the built-in user agent string.
:keyword int retry_total: The total number of attempts to redo a failed operation when an error occurs.
Default value is 3.
:keyword float idle_timeout: Timeout, in seconds, after which this client will close the underlying connection
if there is no activity. By default the value is None, meaning that the client will not shutdown due to
inactivity unless initiated by the service.
:keyword transport_type: The type of transport protocol that will be used for communicating with
the Event Hubs service. Default is `TransportType.Amqp`.
:paramtype transport_type: ~azure.eventhub.TransportType
:rtype: ~azure.eventhub.aio.EventHubProducerClient
.. admonition:: Example:
.. literalinclude:: ../samples/async_samples/sample_code_eventhub_async.py
:start-after: [START create_eventhub_producer_client_from_conn_str_async]
:end-before: [END create_eventhub_producer_client_from_conn_str_async]
:language: python
:dedent: 4
:caption: Create a new instance of the EventHubProducerClient from connection string.
"""
constructor_args = cls._from_connection_string(
conn_str,
eventhub_name=eventhub_name,
logging_enable=logging_enable,
http_proxy=http_proxy,
auth_timeout=auth_timeout,
user_agent=user_agent,
retry_total=retry_total,
transport_type=transport_type,
**kwargs
)
return cls(**constructor_args)
[docs] async def send_batch(
self,
event_data_batch: Union[EventDataBatch, List[EventData]],
*,
timeout: Optional[Union[int, float]] = None,
**kwargs
) -> None:
"""Sends event data and blocks until acknowledgement is received or operation times out.
If you're sending a finite list of `EventData` and you know it's within the event hub
frame size limit, you can send them with a `send_batch` call. Otherwise, use :meth:`create_batch`
to create `EventDataBatch` and add `EventData` into the batch one by one until the size limit,
and then call this method to send out the batch.
:param event_data_batch: The `EventDataBatch` object to be sent or a list of `EventData` to be sent
in a batch. All `EventData` in the list or `EventDataBatch` will land on the same partition.
:type event_data_batch: Union[~azure.eventhub.EventDataBatch, List[~azure.eventhub.EventData]]
:keyword float timeout: The maximum wait time to send the event data.
If not specified, the default wait time specified when the producer was created will be used.
:keyword str partition_id: The specific partition ID to send to. Default is None, in which case the service
will assign to all partitions using round-robin.
A `TypeError` will be raised if partition_id is specified and event_data_batch is an `EventDataBatch` because
`EventDataBatch` itself has partition_id.
:keyword str partition_key: With the given partition_key, event data will be sent to
a particular partition of the Event Hub decided by the service.
A `TypeError` will be raised if partition_key is specified and event_data_batch is an `EventDataBatch` because
`EventDataBatch` itself has partition_key.
If both partition_id and partition_key are provided, the partition_id will take precedence.
:rtype: None
:raises: :class:`AuthenticationError<azure.eventhub.exceptions.AuthenticationError>`
:class:`ConnectError<azure.eventhub.exceptions.ConnectError>`
:class:`ConnectionLostError<azure.eventhub.exceptions.ConnectionLostError>`
:class:`EventDataError<azure.eventhub.exceptions.EventDataError>`
:class:`EventDataSendError<azure.eventhub.exceptions.EventDataSendError>`
:class:`EventHubError<azure.eventhub.exceptions.EventHubError>`
:class:`ValueError`
:class:`TypeError`
.. admonition:: Example:
.. literalinclude:: ../samples/async_samples/sample_code_eventhub_async.py
:start-after: [START eventhub_producer_client_send_async]
:end-before: [END eventhub_producer_client_send_async]
:language: python
:dedent: 4
:caption: Asynchronously sends event data
"""
partition_id = kwargs.get("partition_id")
partition_key = kwargs.get("partition_key")
if isinstance(event_data_batch, EventDataBatch):
if partition_id or partition_key:
raise TypeError("partition_id and partition_key should be None when sending an EventDataBatch "
"because type EventDataBatch itself may have partition_id or partition_key")
to_send_batch = event_data_batch
else:
to_send_batch = await self.create_batch(partition_id=partition_id, partition_key=partition_key)
to_send_batch._load_events(event_data_batch) # pylint:disable=protected-access
partition_id = (
to_send_batch._partition_id or ALL_PARTITIONS # pylint:disable=protected-access
)
try:
await cast(EventHubProducer, self._producers[partition_id]).send(
to_send_batch, timeout=timeout
)
except (KeyError, AttributeError, EventHubError):
await self._start_producer(partition_id, timeout)
await cast(EventHubProducer, self._producers[partition_id]).send(
to_send_batch, timeout=timeout
)
[docs] async def create_batch(
self,
*,
partition_id: Optional[str] = None,
partition_key: Optional[str] = None,
max_size_in_bytes: Optional[int] = None
) -> EventDataBatch:
"""Create an EventDataBatch object with the max size of all content being constrained by max_size_in_bytes.
The max_size_in_bytes should be no greater than the max allowed message size defined by the service.
:param str partition_id: The specific partition ID to send to. Default is None, in which case the service
will assign to all partitions using round-robin.
:param str partition_key: With the given partition_key, event data will be sent to
a particular partition of the Event Hub decided by the service.
If both partition_id and partition_key are provided, the partition_id will take precedence.
:param int max_size_in_bytes: The maximum size of bytes data that an EventDataBatch object can hold. By
default, the value is determined by your Event Hubs tier.
:rtype: ~azure.eventhub.EventDataBatch
.. admonition:: Example:
.. literalinclude:: ../samples/async_samples/sample_code_eventhub_async.py
:start-after: [START eventhub_producer_client_create_batch_async]
:end-before: [END eventhub_producer_client_create_batch_async]
:language: python
:dedent: 4
:caption: Create EventDataBatch object within limited size
"""
if not self._max_message_size_on_link:
await self._get_max_mesage_size()
if max_size_in_bytes and max_size_in_bytes > self._max_message_size_on_link:
raise ValueError(
"Max message size: {} is too large, acceptable max batch size is: {} bytes.".format(
max_size_in_bytes, self._max_message_size_on_link
)
)
event_data_batch = EventDataBatch(
max_size_in_bytes=(max_size_in_bytes or self._max_message_size_on_link),
partition_id=partition_id,
partition_key=partition_key,
)
return event_data_batch
[docs] async def get_eventhub_properties(self) -> Dict[str, Any]:
"""Get properties of the Event Hub.
Keys in the returned dictionary include:
- `eventhub_name` (str)
- `created_at` (UTC datetime.datetime)
- `partition_ids` (list[str])
:rtype: dict
:raises: :class:`EventHubError<azure.eventhub.exceptions.EventHubError>`
"""
return await super(
EventHubProducerClient, self
)._get_eventhub_properties_async()
[docs] async def get_partition_ids(self) -> List[str]:
"""Get partition IDs of the Event Hub.
:rtype: list[str]
:raises: :class:`EventHubError<azure.eventhub.exceptions.EventHubError>`
"""
return await super(EventHubProducerClient, self)._get_partition_ids_async()
[docs] async def get_partition_properties(self, partition_id: str) -> Dict[str, Any]:
"""Get properties of the specified partition.
Keys in the properties dictionary include:
- `eventhub_name` (str)
- `id` (str)
- `beginning_sequence_number` (int)
- `last_enqueued_sequence_number` (int)
- `last_enqueued_offset` (str)
- `last_enqueued_time_utc` (UTC datetime.datetime)
- `is_empty` (bool)
:param partition_id: The target partition ID.
:type partition_id: str
:rtype: dict
:raises: :class:`EventHubError<azure.eventhub.exceptions.EventHubError>`
"""
return await super(
EventHubProducerClient, self
)._get_partition_properties_async(partition_id)
[docs] async def close(self) -> None:
"""Close the Producer client underlying AMQP connection and links.
:rtype: None
.. admonition:: Example:
.. literalinclude:: ../samples/async_samples/sample_code_eventhub_async.py
:start-after: [START eventhub_producer_client_close_async]
:end-before: [END eventhub_producer_client_close_async]
:language: python
:dedent: 4
:caption: Close down the handler.
"""
async with self._lock:
for producer in self._producers.values():
if producer:
await producer.close()
await super(EventHubProducerClient, self)._close_async()