Google Cloud Datastore Operators¶

Firestore in Datastore mode is a NoSQL document database built for automatic scaling, high performance, and ease of application development.

For more information about the service visit Datastore product documentation

Prerequisite Tasks¶

Export Entities¶

To export entities from Google Cloud Datastore to Cloud Storage use CloudDatastoreExportEntitiesOperator

tests/system/providers/google/datastore/example_datastore_export_import.py

export_task = CloudDatastoreExportEntitiesOperator(
    task_id="export_task",
    bucket=BUCKET_NAME,
    project_id=PROJECT_ID,
    overwrite_existing=True,
)

Import Entities¶

To import entities from Cloud Storage to Google Cloud Datastore use CloudDatastoreImportEntitiesOperator

tests/system/providers/google/datastore/example_datastore_export_import.py

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=PROJECT_ID,
)

Allocate Ids¶

To allocate IDs for incomplete keys use CloudDatastoreAllocateIdsOperator

tests/system/providers/google/datastore/example_datastore_commit.py

allocate_ids = CloudDatastoreAllocateIdsOperator(
    task_id="allocate_ids", partial_keys=KEYS, project_id=PROJECT_ID
)

An example of a partial keys required by the operator:

tests/system/providers/google/datastore/example_datastore_commit.py

KEYS = [
    {
        "partitionId": {"projectId": PROJECT_ID, "namespaceId": ""},
        "path": {"kind": "airflow"},
    }
]

Begin transaction¶

To begin a new transaction use CloudDatastoreBeginTransactionOperator

tests/system/providers/google/datastore/example_datastore_commit.py

begin_transaction_commit = CloudDatastoreBeginTransactionOperator(
    task_id="begin_transaction_commit",
    transaction_options=TRANSACTION_OPTIONS,
    project_id=PROJECT_ID,
)

An example of a transaction options required by the operator:

tests/system/providers/google/datastore/example_datastore_commit.py

TRANSACTION_OPTIONS: Dict[str, Any] = {"readWrite": {}}

Commit transaction¶

To commit a transaction, optionally creating, deleting or modifying some entities use CloudDatastoreCommitOperator

tests/system/providers/google/datastore/example_datastore_commit.py

commit_task = CloudDatastoreCommitOperator(task_id="commit_task", body=COMMIT_BODY, project_id=PROJECT_ID)

An example of a commit information required by the operator:

tests/system/providers/google/datastore/example_datastore_commit.py

    COMMIT_BODY = {
        "mode": "TRANSACTIONAL",
        "mutations": [
            {
                "insert": {
                    "key": KEYS[0],
                    "properties": {"string": {"stringValue": "airflow is awesome!"}},
                }
            }
        ],
        "transaction": begin_transaction_commit.output,
    }

Run query¶

To run a query for entities use CloudDatastoreRunQueryOperator

tests/system/providers/google/datastore/example_datastore_query.py

run_query = CloudDatastoreRunQueryOperator(task_id="run_query", body=QUERY, project_id=PROJECT_ID)

An example of a query required by the operator:

tests/system/providers/google/datastore/example_datastore_query.py

    QUERY = {
        "partitionId": {"projectId": PROJECT_ID, "namespaceId": "query"},
        "readOptions": {"transaction": begin_transaction_query.output},
        "query": {},
    }

Roll back transaction¶

To roll back a transaction use CloudDatastoreRollbackOperator

tests/system/providers/google/datastore/example_datastore_rollback.py

rollback_transaction = CloudDatastoreRollbackOperator(
    task_id="rollback_transaction",
    transaction=begin_transaction_to_rollback.output,
)

Get operation state¶

To get the current state of a long-running operation use CloudDatastoreGetOperationOperator

tests/system/providers/google/datastore/example_datastore_export_import.py

get_operation = CloudDatastoreGetOperationOperator(
    task_id='get_operation', name="{{ task_instance.xcom_pull('export_task')['name'] }}"
)

Delete operation¶

To delete an operation use CloudDatastoreDeleteOperationOperator

tests/system/providers/google/datastore/example_datastore_export_import.py

delete_export_operation = CloudDatastoreDeleteOperationOperator(
    task_id='delete_export_operation',
    name="{{ task_instance.xcom_pull('export_task')['name'] }}",
)

References¶

For further information, take a look at:

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