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  """
  Example Airflow DAG that shows how to use Datastore operators.
  
  This example requires that your project contains Datastore instance.
  """
  
  import os
  from typing import Any, Dict
  
  from airflow import models
  from airflow.providers.google.cloud.operators.datastore import (
      CloudDatastoreAllocateIdsOperator,
      CloudDatastoreBeginTransactionOperator,
      CloudDatastoreCommitOperator,
      CloudDatastoreExportEntitiesOperator,
      CloudDatastoreImportEntitiesOperator,
      CloudDatastoreRollbackOperator,
      CloudDatastoreRunQueryOperator,
  )
  from airflow.utils import dates
  
  GCP_PROJECT_ID = os.environ.get("GCP_PROJECT_ID", "example-project")
  BUCKET = os.environ.get("GCP_DATASTORE_BUCKET", "datastore-system-test")
  
  with models.DAG(
      "example_gcp_datastore",
      schedule_interval=None,  # Override to match your needs
      start_date=dates.days_ago(1),
  ) as dag:
      # [START how_to_export_task]
      export_task = CloudDatastoreExportEntitiesOperator(
          task_id="export_task",
          bucket=BUCKET,
          project_id=GCP_PROJECT_ID,
          overwrite_existing=True,
      )
      # [END how_to_export_task]
  
      # [START how_to_import_task]
      import_task = CloudDatastoreImportEntitiesOperator(
          task_id="import_task",
          bucket="{{ task_instance.xcom_pull('export_task')['response']['outputUrl'].split('/')[2] }}",
          file="{{ '/'.join(task_instance.xcom_pull('export_task')['response']['outputUrl'].split('/')[3:]) }}",
          project_id=GCP_PROJECT_ID,
      )
      # [END how_to_import_task]
  
      export_task >> import_task
  
  # [START how_to_keys_def]
  KEYS = [
      {
          "partitionId": {"projectId": GCP_PROJECT_ID, "namespaceId": ""},
          "path": {"kind": "airflow"},
      }
  ]
  # [END how_to_keys_def]
  
  # [START how_to_transaction_def]
  TRANSACTION_OPTIONS: Dict[str, Any] = {"readWrite": {}}
  # [END how_to_transaction_def]
  
  # [START how_to_commit_def]
  COMMIT_BODY = {
      "mode": "TRANSACTIONAL",
      "mutations": [
          {
              "insert": {
                  "key": KEYS[0],
                  "properties": {"string": {"stringValue": "airflow is awesome!"}},
              }
          }
      ],
      "transaction": "{{ task_instance.xcom_pull('begin_transaction_commit') }}",
  }
  # [END how_to_commit_def]
  
  # [START how_to_query_def]
  QUERY = {
      "partitionId": {"projectId": GCP_PROJECT_ID, "namespaceId": ""},
      "readOptions": {"transaction": "{{ task_instance.xcom_pull('begin_transaction_query') }}"},
      "query": {},
  }
  # [END how_to_query_def]
  
  with models.DAG(
      "example_gcp_datastore_operations",
      start_date=dates.days_ago(1),
      schedule_interval=None,
  ) as dag2:
      # [START how_to_allocate_ids]
      allocate_ids = CloudDatastoreAllocateIdsOperator(
          task_id="allocate_ids", partial_keys=KEYS, project_id=GCP_PROJECT_ID
      )
      # [END how_to_allocate_ids]
  
      # [START how_to_begin_transaction]
      begin_transaction_commit = CloudDatastoreBeginTransactionOperator(
          task_id="begin_transaction_commit",
          transaction_options=TRANSACTION_OPTIONS,
          project_id=GCP_PROJECT_ID,
      )
      # [END how_to_begin_transaction]
  
      # [START how_to_commit_task]
      commit_task = CloudDatastoreCommitOperator(
          task_id="commit_task", body=COMMIT_BODY, project_id=GCP_PROJECT_ID
      )
      # [END how_to_commit_task]
  
      allocate_ids >> begin_transaction_commit >> commit_task
  
      begin_transaction_query = CloudDatastoreBeginTransactionOperator(
          task_id="begin_transaction_query",
          transaction_options=TRANSACTION_OPTIONS,
          project_id=GCP_PROJECT_ID,
      )
  
      # [START how_to_run_query]
      run_query = CloudDatastoreRunQueryOperator(task_id="run_query", body=QUERY, project_id=GCP_PROJECT_ID)
      # [END how_to_run_query]
  
      allocate_ids >> begin_transaction_query >> run_query
  
      begin_transaction_to_rollback = CloudDatastoreBeginTransactionOperator(
          task_id="begin_transaction_to_rollback",
          transaction_options=TRANSACTION_OPTIONS,
          project_id=GCP_PROJECT_ID,
      )
  
      # [START how_to_rollback_transaction]
      rollback_transaction = CloudDatastoreRollbackOperator(
          task_id="rollback_transaction",
          transaction="{{ task_instance.xcom_pull('begin_transaction_to_rollback') }}",
      )
      begin_transaction_to_rollback >> rollback_transaction
      # [END how_to_rollback_transaction]
  