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"""Create, get, update, execute and delete an AWS DataSync Task."""
import logging
import random
from typing import TYPE_CHECKING, List, Optional, Sequence
from airflow.exceptions import AirflowException, AirflowTaskTimeout
from airflow.models import BaseOperator
from airflow.providers.amazon.aws.hooks.datasync import DataSyncHook
if TYPE_CHECKING:
from airflow.utils.context import Context
[docs]class DataSyncOperator(BaseOperator):
"""Find, Create, Update, Execute and Delete AWS DataSync Tasks.
If ``do_xcom_push`` is True, then the DataSync TaskArn and TaskExecutionArn
which were executed will be pushed to an XCom.
.. seealso::
For more information on how to use this operator, take a look at the guide:
:ref:`howto/operator:DataSyncOperator`
.. note:: There may be 0, 1, or many existing DataSync Tasks defined in your AWS
environment. The default behavior is to create a new Task if there are 0, or
execute the Task if there was 1 Task, or fail if there were many Tasks.
:param aws_conn_id: AWS connection to use.
:param wait_interval_seconds: Time to wait between two
consecutive calls to check TaskExecution status.
:param max_iterations: Maximum number of
consecutive calls to check TaskExecution status.
:param wait_for_completion: If True, wait for the task execution to reach a final state
:param task_arn: AWS DataSync TaskArn to use. If None, then this operator will
attempt to either search for an existing Task or attempt to create a new Task.
:param source_location_uri: Source location URI to search for. All DataSync
Tasks with a LocationArn with this URI will be considered.
Example: ``smb://server/subdir``
:param destination_location_uri: Destination location URI to search for.
All DataSync Tasks with a LocationArn with this URI will be considered.
Example: ``s3://airflow_bucket/stuff``
:param allow_random_task_choice: If multiple Tasks match, one must be chosen to
execute. If allow_random_task_choice is True then a random one is chosen.
:param allow_random_location_choice: If multiple Locations match, one must be chosen
when creating a task. If allow_random_location_choice is True then a random one is chosen.
:param create_task_kwargs: If no suitable TaskArn is identified,
it will be created if ``create_task_kwargs`` is defined.
``create_task_kwargs`` is then used internally like this:
``boto3.create_task(**create_task_kwargs)``
Example: ``{'Name': 'xyz', 'Options': ..., 'Excludes': ..., 'Tags': ...}``
:param create_source_location_kwargs: If no suitable LocationArn is found,
a Location will be created if ``create_source_location_kwargs`` is defined.
``create_source_location_kwargs`` is then used internally like this:
``boto3.create_location_xyz(**create_source_location_kwargs)``
The xyz is determined from the prefix of source_location_uri, eg ``smb:/...`` or ``s3:/...``
Example: ``{'Subdirectory': ..., 'ServerHostname': ..., ...}``
:param create_destination_location_kwargs: If no suitable LocationArn is found,
a Location will be created if ``create_destination_location_kwargs`` is defined.
``create_destination_location_kwargs`` is used internally like this:
``boto3.create_location_xyz(**create_destination_location_kwargs)``
The xyz is determined from the prefix of destination_location_uri, eg ``smb:/...` or ``s3:/...``
Example: ``{'S3BucketArn': ..., 'S3Config': {'BucketAccessRoleArn': ...}, ...}``
:param update_task_kwargs: If a suitable TaskArn is found or created,
it will be updated if ``update_task_kwargs`` is defined.
``update_task_kwargs`` is used internally like this:
``boto3.update_task(TaskArn=task_arn, **update_task_kwargs)``
Example: ``{'Name': 'xyz', 'Options': ..., 'Excludes': ...}``
:param task_execution_kwargs: Additional kwargs passed directly when starting the
Task execution, used internally like this:
``boto3.start_task_execution(TaskArn=task_arn, **task_execution_kwargs)``
:param delete_task_after_execution: If True then the TaskArn which was executed
will be deleted from AWS DataSync on successful completion.
:raises AirflowException: If ``task_arn`` was not specified, or if
either ``source_location_uri`` or ``destination_location_uri`` were
not specified.
:raises AirflowException: If source or destination Location were not found
and could not be created.
:raises AirflowException: If ``choose_task`` or ``choose_location`` fails.
:raises AirflowException: If Task creation, update, execution or delete fails.
"""
[docs] template_fields: Sequence[str] = (
"task_arn",
"source_location_uri",
"destination_location_uri",
"create_task_kwargs",
"create_source_location_kwargs",
"create_destination_location_kwargs",
"update_task_kwargs",
"task_execution_kwargs",
)
[docs] template_fields_renderers = {
"create_task_kwargs": "json",
"create_source_location_kwargs": "json",
"create_destination_location_kwargs": "json",
"update_task_kwargs": "json",
"task_execution_kwargs": "json",
}
def __init__(
self,
*,
aws_conn_id: str = "aws_default",
wait_interval_seconds: int = 30,
max_iterations: int = 60,
wait_for_completion: bool = True,
task_arn: Optional[str] = None,
source_location_uri: Optional[str] = None,
destination_location_uri: Optional[str] = None,
allow_random_task_choice: bool = False,
allow_random_location_choice: bool = False,
create_task_kwargs: Optional[dict] = None,
create_source_location_kwargs: Optional[dict] = None,
create_destination_location_kwargs: Optional[dict] = None,
update_task_kwargs: Optional[dict] = None,
task_execution_kwargs: Optional[dict] = None,
delete_task_after_execution: bool = False,
**kwargs,
):
super().__init__(**kwargs)
# Assignments
self.aws_conn_id = aws_conn_id
self.wait_interval_seconds = wait_interval_seconds
self.max_iterations = max_iterations
self.wait_for_completion = wait_for_completion
self.task_arn = task_arn
self.source_location_uri = source_location_uri
self.destination_location_uri = destination_location_uri
self.allow_random_task_choice = allow_random_task_choice
self.allow_random_location_choice = allow_random_location_choice
self.create_task_kwargs = create_task_kwargs if create_task_kwargs else {}
self.create_source_location_kwargs = {}
if create_source_location_kwargs:
self.create_source_location_kwargs = create_source_location_kwargs
self.create_destination_location_kwargs = {}
if create_destination_location_kwargs:
self.create_destination_location_kwargs = create_destination_location_kwargs
self.update_task_kwargs = update_task_kwargs if update_task_kwargs else {}
self.task_execution_kwargs = task_execution_kwargs if task_execution_kwargs else {}
self.delete_task_after_execution = delete_task_after_execution
# Validations
valid = False
if self.task_arn:
valid = True
if self.source_location_uri and self.destination_location_uri:
valid = True
if not valid:
raise AirflowException(
f"Either specify task_arn or both source_location_uri and destination_location_uri. "
f"task_arn={task_arn!r}, source_location_uri={source_location_uri!r}, "
f"destination_location_uri={destination_location_uri!r}"
)
# Others
self.hook: Optional[DataSyncHook] = None
# Candidates - these are found in AWS as possible things
# for us to use
self.candidate_source_location_arns: Optional[List[str]] = None
self.candidate_destination_location_arns: Optional[List[str]] = None
self.candidate_task_arns: Optional[List[str]] = None
# Actuals
self.source_location_arn: Optional[str] = None
self.destination_location_arn: Optional[str] = None
self.task_execution_arn: Optional[str] = None
[docs] def get_hook(self) -> DataSyncHook:
"""Create and return DataSyncHook.
:return DataSyncHook: An DataSyncHook instance.
"""
if self.hook:
return self.hook
self.hook = DataSyncHook(
aws_conn_id=self.aws_conn_id,
wait_interval_seconds=self.wait_interval_seconds,
)
return self.hook
[docs] def execute(self, context: 'Context'):
# If task_arn was not specified then try to
# find 0, 1 or many candidate DataSync Tasks to run
if not self.task_arn:
self._get_tasks_and_locations()
# If some were found, identify which one to run
if self.candidate_task_arns:
self.task_arn = self.choose_task(self.candidate_task_arns)
# If we could not find one then try to create one
if not self.task_arn and self.create_task_kwargs:
self._create_datasync_task()
if not self.task_arn:
raise AirflowException("DataSync TaskArn could not be identified or created.")
self.log.info("Using DataSync TaskArn %s", self.task_arn)
# Update the DataSync Task
if self.update_task_kwargs:
self._update_datasync_task()
# Execute the DataSync Task
self._execute_datasync_task()
if not self.task_execution_arn:
raise AirflowException("Nothing was executed")
# Delete the DataSyncTask
if self.delete_task_after_execution:
self._delete_datasync_task()
return {"TaskArn": self.task_arn, "TaskExecutionArn": self.task_execution_arn}
def _get_tasks_and_locations(self) -> None:
"""Find existing DataSync Task based on source and dest Locations."""
hook = self.get_hook()
self.candidate_source_location_arns = self._get_location_arns(self.source_location_uri)
self.candidate_destination_location_arns = self._get_location_arns(self.destination_location_uri)
if not self.candidate_source_location_arns:
self.log.info("No matching source Locations")
return
if not self.candidate_destination_location_arns:
self.log.info("No matching destination Locations")
return
self.log.info("Finding DataSync TaskArns that have these LocationArns")
self.candidate_task_arns = hook.get_task_arns_for_location_arns(
self.candidate_source_location_arns,
self.candidate_destination_location_arns,
)
self.log.info("Found candidate DataSync TaskArns %s", self.candidate_task_arns)
[docs] def choose_task(self, task_arn_list: list) -> Optional[str]:
"""Select 1 DataSync TaskArn from a list"""
if not task_arn_list:
return None
if len(task_arn_list) == 1:
return task_arn_list[0]
if self.allow_random_task_choice:
# Items are unordered so we don't want to just take
# the [0] one as it implies ordered items were received
# from AWS and might lead to confusion. Rather explicitly
# choose a random one
return random.choice(task_arn_list)
raise AirflowException(f"Unable to choose a Task from {task_arn_list}")
[docs] def choose_location(self, location_arn_list: Optional[List[str]]) -> Optional[str]:
"""Select 1 DataSync LocationArn from a list"""
if not location_arn_list:
return None
if len(location_arn_list) == 1:
return location_arn_list[0]
if self.allow_random_location_choice:
# Items are unordered so we don't want to just take
# the [0] one as it implies ordered items were received
# from AWS and might lead to confusion. Rather explicitly
# choose a random one
return random.choice(location_arn_list)
raise AirflowException(f"Unable to choose a Location from {location_arn_list}")
def _create_datasync_task(self) -> None:
"""Create a AWS DataSyncTask."""
hook = self.get_hook()
self.source_location_arn = self.choose_location(self.candidate_source_location_arns)
if not self.source_location_arn and self.source_location_uri and self.create_source_location_kwargs:
self.log.info('Attempting to create source Location')
self.source_location_arn = hook.create_location(
self.source_location_uri, **self.create_source_location_kwargs
)
if not self.source_location_arn:
raise AirflowException(
"Unable to determine source LocationArn. Does a suitable DataSync Location exist?"
)
self.destination_location_arn = self.choose_location(self.candidate_destination_location_arns)
if (
not self.destination_location_arn
and self.destination_location_uri
and self.create_destination_location_kwargs
):
self.log.info('Attempting to create destination Location')
self.destination_location_arn = hook.create_location(
self.destination_location_uri, **self.create_destination_location_kwargs
)
if not self.destination_location_arn:
raise AirflowException(
"Unable to determine destination LocationArn. Does a suitable DataSync Location exist?"
)
self.log.info("Creating a Task.")
self.task_arn = hook.create_task(
self.source_location_arn, self.destination_location_arn, **self.create_task_kwargs
)
if not self.task_arn:
raise AirflowException("Task could not be created")
self.log.info("Created a Task with TaskArn %s", self.task_arn)
def _update_datasync_task(self) -> None:
"""Update a AWS DataSyncTask."""
if not self.task_arn:
return
hook = self.get_hook()
self.log.info("Updating TaskArn %s", self.task_arn)
hook.update_task(self.task_arn, **self.update_task_kwargs)
self.log.info("Updated TaskArn %s", self.task_arn)
def _execute_datasync_task(self) -> None:
"""Create and monitor an AWS DataSync TaskExecution for a Task."""
if not self.task_arn:
raise AirflowException("Missing TaskArn")
hook = self.get_hook()
# Create a task execution:
self.log.info("Starting execution for TaskArn %s", self.task_arn)
self.task_execution_arn = hook.start_task_execution(self.task_arn, **self.task_execution_kwargs)
self.log.info("Started TaskExecutionArn %s", self.task_execution_arn)
if not self.wait_for_completion:
return
# Wait for task execution to complete
self.log.info("Waiting for TaskExecutionArn %s", self.task_execution_arn)
try:
result = hook.wait_for_task_execution(self.task_execution_arn, max_iterations=self.max_iterations)
except (AirflowTaskTimeout, AirflowException) as e:
self.log.error('Cancelling TaskExecution after Exception: %s', e)
self._cancel_datasync_task_execution()
raise
self.log.info("Completed TaskExecutionArn %s", self.task_execution_arn)
task_execution_description = hook.describe_task_execution(task_execution_arn=self.task_execution_arn)
self.log.info("task_execution_description=%s", task_execution_description)
# Log some meaningful statuses
level = logging.ERROR if not result else logging.INFO
self.log.log(level, 'Status=%s', task_execution_description['Status'])
if 'Result' in task_execution_description:
for k, v in task_execution_description['Result'].items():
if 'Status' in k or 'Error' in k:
self.log.log(level, '%s=%s', k, v)
if not result:
raise AirflowException(f"Failed TaskExecutionArn {self.task_execution_arn}")
def _cancel_datasync_task_execution(self):
"""Cancel the submitted DataSync task."""
hook = self.get_hook()
if self.task_execution_arn:
self.log.info("Cancelling TaskExecutionArn %s", self.task_execution_arn)
hook.cancel_task_execution(task_execution_arn=self.task_execution_arn)
self.log.info("Cancelled TaskExecutionArn %s", self.task_execution_arn)
[docs] def on_kill(self):
self.log.error('Cancelling TaskExecution after task was killed')
self._cancel_datasync_task_execution()
def _delete_datasync_task(self) -> None:
"""Deletes an AWS DataSync Task."""
if not self.task_arn:
return
hook = self.get_hook()
# Delete task:
self.log.info("Deleting Task with TaskArn %s", self.task_arn)
hook.delete_task(self.task_arn)
self.log.info("Task Deleted")
def _get_location_arns(self, location_uri) -> List[str]:
location_arns = self.get_hook().get_location_arns(location_uri)
self.log.info("Found LocationArns %s for LocationUri %s", location_arns, location_uri)
return location_arns
