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from typing import Any, Dict, List, Optional
from botocore.exceptions import ClientError
from airflow.providers.amazon.aws.hooks.base_aws import AwsBaseHook
[docs]class RedshiftHook(AwsBaseHook):
"""
Interact with AWS Redshift, using the boto3 library
Additional arguments (such as ``aws_conn_id``) may be specified and
are passed down to the underlying AwsBaseHook.
.. seealso::
:class:`~airflow.providers.amazon.aws.hooks.base_aws.AwsBaseHook`
:param aws_conn_id: The Airflow connection used for AWS credentials.
"""
def __init__(self, *args, **kwargs) -> None:
kwargs["client_type"] = "redshift"
super().__init__(*args, **kwargs)
[docs] def create_cluster(
self,
cluster_identifier: str,
node_type: str,
master_username: str,
master_user_password: str,
params: Dict[str, Any],
) -> Dict[str, Any]:
"""
Creates a new cluster with the specified parameters
:param cluster_identifier: A unique identifier for the cluster.
:param node_type: The node type to be provisioned for the cluster.
Valid Values: ``ds2.xlarge``, ``ds2.8xlarge``, ``dc1.large``,
``dc1.8xlarge``, ``dc2.large``, ``dc2.8xlarge``, ``ra3.xlplus``,
``ra3.4xlarge``, and ``ra3.16xlarge``.
:param master_username: The username associated with the admin user account
for the cluster that is being created.
:param master_user_password: password associated with the admin user account
for the cluster that is being created.
:param params: Remaining AWS Create cluster API params.
"""
try:
response = self.get_conn().create_cluster(
ClusterIdentifier=cluster_identifier,
NodeType=node_type,
MasterUsername=master_username,
MasterUserPassword=master_user_password,
**params,
)
return response
except ClientError as e:
raise e
# TODO: Wrap create_cluster_snapshot
[docs] def cluster_status(self, cluster_identifier: str) -> str:
"""
Return status of a cluster
:param cluster_identifier: unique identifier of a cluster
:param skip_final_cluster_snapshot: determines cluster snapshot creation
:param final_cluster_snapshot_identifier: Optional[str]
"""
try:
response = self.get_conn().describe_clusters(ClusterIdentifier=cluster_identifier)['Clusters']
return response[0]['ClusterStatus'] if response else None
except self.get_conn().exceptions.ClusterNotFoundFault:
return 'cluster_not_found'
[docs] def delete_cluster(
self,
cluster_identifier: str,
skip_final_cluster_snapshot: bool = True,
final_cluster_snapshot_identifier: Optional[str] = None,
):
"""
Delete a cluster and optionally create a snapshot
:param cluster_identifier: unique identifier of a cluster
:param skip_final_cluster_snapshot: determines cluster snapshot creation
:param final_cluster_snapshot_identifier: name of final cluster snapshot
"""
final_cluster_snapshot_identifier = final_cluster_snapshot_identifier or ''
response = self.get_conn().delete_cluster(
ClusterIdentifier=cluster_identifier,
SkipFinalClusterSnapshot=skip_final_cluster_snapshot,
FinalClusterSnapshotIdentifier=final_cluster_snapshot_identifier,
)
return response['Cluster'] if response['Cluster'] else None
[docs] def describe_cluster_snapshots(self, cluster_identifier: str) -> Optional[List[str]]:
"""
Gets a list of snapshots for a cluster
:param cluster_identifier: unique identifier of a cluster
"""
response = self.get_conn().describe_cluster_snapshots(ClusterIdentifier=cluster_identifier)
if 'Snapshots' not in response:
return None
snapshots = response['Snapshots']
snapshots = [snapshot for snapshot in snapshots if snapshot["Status"]]
snapshots.sort(key=lambda x: x['SnapshotCreateTime'], reverse=True)
return snapshots
[docs] def restore_from_cluster_snapshot(self, cluster_identifier: str, snapshot_identifier: str) -> str:
"""
Restores a cluster from its snapshot
:param cluster_identifier: unique identifier of a cluster
:param snapshot_identifier: unique identifier for a snapshot of a cluster
"""
response = self.get_conn().restore_from_cluster_snapshot(
ClusterIdentifier=cluster_identifier, SnapshotIdentifier=snapshot_identifier
)
return response['Cluster'] if response['Cluster'] else None
[docs] def create_cluster_snapshot(
self, snapshot_identifier: str, cluster_identifier: str, retention_period: int = -1
) -> str:
"""
Creates a snapshot of a cluster
:param snapshot_identifier: unique identifier for a snapshot of a cluster
:param cluster_identifier: unique identifier of a cluster
:param retention_period: The number of days that a manual snapshot is retained.
If the value is -1, the manual snapshot is retained indefinitely.
"""
response = self.get_conn().create_cluster_snapshot(
SnapshotIdentifier=snapshot_identifier,
ClusterIdentifier=cluster_identifier,
ManualSnapshotRetentionPeriod=retention_period,
)
return response['Snapshot'] if response['Snapshot'] else None
[docs] def get_cluster_snapshot_status(self, snapshot_identifier: str, cluster_identifier: str):
"""
Return Redshift cluster snapshot status. If cluster snapshot not found return ``None``
:param snapshot_identifier: A unique identifier for the snapshot that you are requesting
:param cluster_identifier: The unique identifier of the cluster the snapshot was created from
"""
try:
response = self.get_conn().describe_cluster_snapshots(
ClusterIdentifier=cluster_identifier,
SnapshotIdentifier=snapshot_identifier,
)
snapshot = response.get("Snapshots")[0]
snapshot_status: str = snapshot.get("Status")
return snapshot_status
except self.get_conn().exceptions.ClusterSnapshotNotFoundFault:
return None
