Remove datasets that have been deleted from the registry

oc4ids_datastore_pipeline/database.py

@@ -8,6 +8,8 @@
     Engine,
     String,
     create_engine,
+    delete,
+    select,
 )
 from sqlalchemy.orm import DeclarativeBase, Mapped, Session, mapped_column
 
@@ -45,3 +47,16 @@ def save_dataset(dataset: Dataset) -> None:
     with Session(get_engine()) as session:
         session.merge(dataset)
         session.commit()
+
+
+def delete_dataset(dataset_id: str) -> None:
+    with Session(get_engine()) as session:
+        session.execute(delete(Dataset).where(Dataset.dataset_id == dataset_id))
+        session.commit()
+
+
+def get_dataset_ids() -> list[str]:
+    with Session(get_engine()) as session:
+        return [
+            dataset_id for dataset_id in session.scalars(select(Dataset.dataset_id))
+        ]

oc4ids_datastore_pipeline/pipeline.py

@@ -9,7 +9,12 @@
 import requests
 from libcoveoc4ids.api import oc4ids_json_output
 
-from oc4ids_datastore_pipeline.database import Dataset, save_dataset
+from oc4ids_datastore_pipeline.database import (
+    Dataset,
+    delete_dataset,
+    get_dataset_ids,
+    save_dataset,
+)
 from oc4ids_datastore_pipeline.registry import (
     fetch_registered_datasets,
     get_license_name_from_url,
@@ -122,11 +127,20 @@ def process_dataset(dataset_name: str, dataset_url: str) -> None:
         logger.warning(f"Failed to process dataset {dataset_name} with error {e}")
 
 
-def process_datasets() -> None:
+def process_deleted_datasets(registered_datasets: dict[str, str]) -> None:
+    stored_datasets = get_dataset_ids()
+    deleted_datasets = stored_datasets - registered_datasets.keys()
+    for dataset_id in deleted_datasets:
+        logger.info(f"Dataset {dataset_id} is no longer in the registry, deleting")
+        delete_dataset(dataset_id)
+
+
+def process_registry() -> None:
     registered_datasets = fetch_registered_datasets()
+    process_deleted_datasets(registered_datasets)
     for name, url in registered_datasets.items():
         process_dataset(name, url)
 
 
 def run() -> None:
-    process_datasets()
+    process_registry()

oc4ids_datastore_pipeline/registry.py

@@ -22,9 +22,13 @@ def fetch_registered_datasets() -> dict[str, str]:
         }
         registered_datasets_count = len(registered_datasets)
         logger.info(f"Fetched URLs for {registered_datasets_count} datasets")
-        return registered_datasets
     except Exception as e:
         raise Exception("Failed to fetch datasets list from registry", e)
+    if registered_datasets_count < 1:
+        raise Exception(
+            "Zero datasets returned from registry, likely an upstream error"
+        )
+    return registered_datasets
 
 
 def fetch_license_mappings() -> dict[str, str]:

tests/test_database.py

@@ -0,0 +1,54 @@
+import datetime
+from typing import Any, Generator
+
+import pytest
+from pytest_mock import MockerFixture
+from sqlalchemy import create_engine
+
+from oc4ids_datastore_pipeline.database import (
+    Base,
+    Dataset,
+    delete_dataset,
+    get_dataset_ids,
+    save_dataset,
+)
+
+
+@pytest.fixture(autouse=True)
+def before_and_after_each(mocker: MockerFixture) -> Generator[Any, Any, Any]:
+    engine = create_engine("sqlite:///:memory:")
+    patch_get_engine = mocker.patch("oc4ids_datastore_pipeline.database.get_engine")
+    patch_get_engine.return_value = engine
+    Base.metadata.create_all(engine)
+    yield
+    engine.dispose()
+
+
+def test_save_dataset() -> None:
+    dataset = Dataset(
+        dataset_id="test_dataset",
+        source_url="https://test_dataset.json",
+        publisher_name="test_publisher",
+        json_url="data/test_dataset.json",
+        updated_at=datetime.datetime.now(datetime.UTC),
+    )
+    save_dataset(dataset)
+
+    assert get_dataset_ids() == ["test_dataset"]
+
+
+def test_delete_dataset() -> None:
+    dataset = Dataset(
+        dataset_id="test_dataset",
+        source_url="https://test_dataset.json",
+        publisher_name="test_publisher",
+        json_url="data/test_dataset.json",
+        updated_at=datetime.datetime.now(datetime.UTC),
+    )
+    save_dataset(dataset)
+
+    assert get_dataset_ids() == ["test_dataset"]
+
+    delete_dataset("test_dataset")
+
+    assert get_dataset_ids() == []

tests/test_pipeline.py

@@ -8,6 +8,7 @@
 from oc4ids_datastore_pipeline.pipeline import (
     download_json,
     process_dataset,
+    process_deleted_datasets,
     transform_to_csv_and_xlsx,
     validate_json,
     write_json_to_file,
@@ -102,6 +103,21 @@ def test_transform_to_csv_and_xlsx_catches_exception(mocker: MockerFixture) -> N
     assert xlsx_path is None
 
 
+def test_process_deleted_datasets(mocker: MockerFixture) -> None:
+    patch_get_dataset_ids = mocker.patch(
+        "oc4ids_datastore_pipeline.pipeline.get_dataset_ids"
+    )
+    patch_get_dataset_ids.return_value = ["old_dataset", "test_dataset"]
+    patch_delete_dataset = mocker.patch(
+        "oc4ids_datastore_pipeline.pipeline.delete_dataset"
+    )
+
+    registered_datasets = {"test_dataset": "https://test_dataset.json"}
+    process_deleted_datasets(registered_datasets)
+
+    patch_delete_dataset.assert_called_once_with("old_dataset")
+
+
 def test_process_dataset_catches_exception(mocker: MockerFixture) -> None:
     patch_download_json = mocker.patch(
         "oc4ids_datastore_pipeline.pipeline.download_json"

tests/test_registry.py

@@ -38,6 +38,20 @@ def test_fetch_registered_datasets_raises_failure_exception(
     assert "Mocked exception" in str(exc_info.value)
 
 
+def test_fetch_registered_datasets_raises_exception_when_no_datasets(
+    mocker: MockerFixture,
+) -> None:
+    mock_response = MagicMock()
+    mock_response.json.return_value = {"records": {}}
+    patch_get = mocker.patch("oc4ids_datastore_pipeline.pipeline.requests.get")
+    patch_get.return_value = mock_response
+
+    with pytest.raises(Exception) as exc_info:
+        fetch_registered_datasets()
+
+    assert "Zero datasets returned from registry" in str(exc_info.value)
+
+
 def test_fetch_license_mappings(mocker: MockerFixture) -> None:
     mock_response = MagicMock()
     mock_response.json.return_value = {