From c612b87bb61273599a7ed1997cfe02be65364600 Mon Sep 17 00:00:00 2001
From: Jamie Diprose <5715104+jdddog@users.noreply.github.com>
Date: Fri, 24 Nov 2023 18:09:04 +1300
Subject: [PATCH] Add reusable tasks

---
 .../observatory/platform/tasks.py             | 80 +++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 observatory-platform/observatory/platform/tasks.py

diff --git a/observatory-platform/observatory/platform/tasks.py b/observatory-platform/observatory/platform/tasks.py
new file mode 100644
index 000000000..e077365d5
--- /dev/null
+++ b/observatory-platform/observatory/platform/tasks.py
@@ -0,0 +1,80 @@
+# Copyright 2020-2023 Curtin University
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+from __future__ import annotations
+
+from typing import List, Optional
+
+from airflow.decorators import task
+from airflow.exceptions import AirflowSkipException
+
+from observatory.platform.airflow import check_variables, check_connections
+from observatory.platform.gcp import gcp_delete_disk, gcp_create_disk
+from observatory.platform.gke import gke_create_volume, gke_delete_volume
+
+
+@task
+def check_dependencies(airflow_vars: Optional[List[str]] = None, airflow_conns: Optional[List[str]] = None, **context):
+    """Checks if the given Airflow Variables and Connections exist.
+
+    :param airflow_vars: the Airflow Variables to check exist.
+    :param airflow_conns: the Airflow Connections to check exist.
+    :return: None.
+    """
+
+    vars_valid = True
+    conns_valid = True
+    if airflow_vars:
+        vars_valid = check_variables(*airflow_vars)
+    if airflow_conns:
+        conns_valid = check_connections(*airflow_conns)
+
+    if not vars_valid or not conns_valid:
+        raise AirflowSkipException("Required variables or connections are missing")
+
+
+@task
+def gke_create_storage(
+    project_id: str, zone: str, volume_name: str, volume_size: int, kubernetes_conn_id: str, **context
+):
+    """Create storage on a GKE cluster.
+
+    :param project_id: the Google Cloud project ID.
+    :param zone: the Google Cloud zone.
+    :param volume_name: the name of the volume.
+    :param volume_size: the volume size.
+    :param kubernetes_conn_id: the Kubernetes Airflow Connection ID.
+    :param context: the Airflow context.
+    :return: None.
+    """
+
+    gcp_create_disk(project_id=project_id, zone=zone, disk_name=volume_name, disk_size_gb=volume_size)
+    gke_create_volume(kubernetes_conn_id=kubernetes_conn_id, volume_name=volume_name, size_gi=volume_size)
+
+
+@task
+def gke_delete_storage(project_id: str, zone: str, volume_name: str, kubernetes_conn_id: str, **context):
+    """Delete storage on a GKE cluster.
+
+    :param project_id: the Google Cloud project ID.
+    :param zone: the Google Cloud zone.
+    :param volume_name: the name of the volume.
+    :param kubernetes_conn_id: the Kubernetes Airflow Connection ID.
+    :param context: the Airflow context.
+    :return: None.
+    """
+
+    gke_delete_volume(kubernetes_conn_id=kubernetes_conn_id, volume_name=volume_name)
+    gcp_delete_disk(project_id=project_id, zone=zone, disk_name=volume_name)