# --------------------------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See License.txt in the project root for license information.
# --------------------------------------------------------------------------------------------
import logging
from typing import Dict, Optional, Any, TYPE_CHECKING
from .._utils import get_last_enqueued_event_properties
from .checkpoint_store import CheckpointStore
_LOGGER = logging.getLogger(__name__)
if TYPE_CHECKING:
from .._common import EventData
[docs]class PartitionContext(object):
"""Contains partition related context information.
A `PartitionContext` instance will be passed to the event, error and initialization callbacks defined
when calling `EventHubConsumerClient.receive()`.
Users can call `update_checkpoint()` of this class to persist checkpoint data.
"""
def __init__(
self,
fully_qualified_namespace,
eventhub_name,
consumer_group,
partition_id,
checkpoint_store=None,
):
# type: (str, str, str, str, Optional[CheckpointStore]) -> None
self.fully_qualified_namespace = fully_qualified_namespace
self.partition_id = partition_id
self.eventhub_name = eventhub_name
self.consumer_group = consumer_group
self._checkpoint_store = checkpoint_store
self._last_received_event = None # type: Optional[EventData]
@property
def last_enqueued_event_properties(self):
# type: () -> Optional[Dict[str, Any]]
"""The latest enqueued event information.
This property will be updated each time an event is received if the receiver is created
with `track_last_enqueued_event_properties` set to `True`.
The properties dict includes following information of the last enqueued event:
- `sequence_number` (int)
- `offset` (str)
- `enqueued_time` (UTC datetime.datetime)
- `retrieval_time` (UTC datetime.datetime)
:rtype: dict or None
"""
if self._last_received_event:
return get_last_enqueued_event_properties(self._last_received_event)
return None
[docs] def update_checkpoint(self, event=None):
# type: (Optional[EventData]) -> None
"""Updates the receive checkpoint to the given events offset.
:param ~azure.eventhub.EventData event: The EventData instance which contains the offset and
sequence number information used for checkpoint.
:rtype: None
"""
if self._checkpoint_store:
checkpoint_event = event or self._last_received_event
if checkpoint_event:
checkpoint = {
"fully_qualified_namespace": self.fully_qualified_namespace,
"eventhub_name": self.eventhub_name,
"consumer_group": self.consumer_group,
"partition_id": self.partition_id,
"offset": checkpoint_event.offset,
"sequence_number": checkpoint_event.sequence_number,
}
self._checkpoint_store.update_checkpoint(checkpoint)
else:
_LOGGER.warning(
"namespace %r, eventhub %r, consumer_group %r, partition_id %r "
"update_checkpoint is called without checkpoint store. No checkpoint is updated.",
self.fully_qualified_namespace,
self.eventhub_name,
self.consumer_group,
self.partition_id,
)