Refactor fetch CLI tool logic (#243)

Refactor fetch CLI tool, sharing more functionality with the fetch
Celery task.

AIPscan/Aggregator/task_helpers.py

@@ -158,3 +158,13 @@ def write_mets(http_response, package_uuid, subdir):
     with open(download_file, "wb") as file:
         file.write(http_response.content)
     return download_file
+
+
+def summarize_fetch_job_results(fetch_job):
+    return "aips: '{}'; sips: '{}'; dips: '{}'; deleted: '{}'; replicated: '{}'".format(
+        fetch_job.total_aips,
+        fetch_job.total_sips,
+        fetch_job.total_dips,
+        fetch_job.total_deleted_aips,
+        fetch_job.total_replicas,
+    )

AIPscan/Aggregator/tasks.py

@@ -19,6 +19,7 @@
     format_api_url_with_limit_offset,
     parse_package_list_file,
     process_package_object,
+    summarize_fetch_job_results,
 )
 from AIPscan.extensions import celery
 from AIPscan.helpers import file_sha256_hash
@@ -99,44 +100,6 @@ def start_mets_task(
         get_mets.apply(args=args)
 
 
-def parse_packages_and_load_mets(
-    package_list, timestamp, package_list_no, storage_service_id, fetch_job_id
-):
-    """Parse packages documents from the storage service and initiate
-    the load mets functions of AIPscan. Results are written to the
-    database.
-    """
-    OBJECTS = "objects"
-    packages = []
-
-    for package_obj in package_list.get(OBJECTS, []):
-        package = process_package_object(package_obj)
-
-        packages.append(package)
-        handle_deletion(package)
-
-        if not package.is_undeleted_aip():
-            continue
-
-        start_mets_task(
-            package.uuid,
-            package.size,
-            package.get_relative_path(),
-            package.current_location,
-            package.origin_pipeline,
-            timestamp,
-            package_list_no,
-            storage_service_id,
-            fetch_job_id,
-        )
-    return packages
-
-
-def handle_deletion(package):
-    if package.is_deleted():
-        delete_aip(package.uuid)
-
-
 def delete_aip(uuid):
     logger.warning("Package deleted from SS: '%s'", uuid)
 
@@ -180,11 +143,12 @@ def workflow_coordinator(
         )
         # Process packages and create a new worker to download and parse
         # each METS separately.
-        package_list = parse_package_list_file(json_file_path, logger, True)
+        packages = parse_package_list_file(json_file_path, logger, True)
 
-        packages = parse_packages_and_load_mets(
-            package_list, timestamp, package_list_no, storage_service_id, fetch_job_id
+        packages = process_packages(
+            packages, storage_service_id, timestamp, package_list_no, fetch_job_id, True
         )
+
         all_packages = all_packages + packages
 
     total_packages_count = package_lists_task.info["totalPackages"]
@@ -193,16 +157,7 @@ def workflow_coordinator(
         fetch_job_id, all_packages, total_packages_count
     )
 
-    summary = (
-        "aips: '{}'; sips: '{}'; dips: '{}'; deleted: '{}'; replicated: '{}'".format(
-            obj.total_aips,
-            obj.total_sips,
-            obj.total_dips,
-            obj.total_deleted_aips,
-            obj.total_replicas,
-        )
-    )
-    logger.info("%s", summary)
+    logger.info("%s", summarize_fetch_job_results(obj))
 
 
 def make_request(request_url, request_url_without_api_key):
@@ -412,3 +367,66 @@ def delete_storage_service(storage_service_id):
 
     db.session.delete(storage_service)
     db.session.commit()
+
+
+def handle_deletion(package):
+    if package.is_deleted():
+        delete_aip(package.uuid)
+
+
+def process_packages(
+    packages,
+    storage_service_id,
+    timestamp_str,
+    package_list_no,
+    fetch_job_id,
+    run_as_task=False,
+    logger=None,
+    start_item=None,
+    end_item=None,
+):
+    """Parse packages documents from the storage service and initiate
+    the load mets functions of AIPscan. Results are written to the
+    database.
+    """
+    processed_packages = []
+
+    package_count = 0
+    for package_obj in packages.get("objects", []):
+        package_count += 1
+
+        package = process_package_object(package_obj)
+
+        # Only process packages within paging window, if specified
+        if start_item is None or (
+            package_count >= start_item and package_count <= end_item
+        ):
+            # Calculate current item being processed
+            if start_item is not None:
+                current_item = start_item + len(processed_packages)
+
+                if logger:
+                    logger.info(
+                        f"Processing {package.uuid} ({current_item} of {end_item})"
+                    )
+
+            processed_packages.append(package)
+            handle_deletion(package)
+
+            if not package.is_undeleted_aip():
+                continue
+
+            start_mets_task(
+                package.uuid,
+                package.size,
+                package.get_relative_path(),
+                package.current_location,
+                package.origin_pipeline,
+                timestamp_str,
+                package_list_no,
+                storage_service_id,
+                fetch_job_id,
+                run_as_task,
+            )
+
+    return processed_packages

AIPscan/Aggregator/tests/test_task_helpers.py

@@ -305,3 +305,23 @@ def test_process_package_object(packages, idx, storage_service_package):
     """
     package_obj = task_helpers.process_package_object(packages[idx])
     assert package_obj == storage_service_package, idx
+
+
+def test_summarize_fetch_job_results():
+    fetch_job = models.FetchJob(
+        total_packages=15,
+        total_aips=1,
+        total_deleted_aips=4,
+        download_start=None,
+        download_end=None,
+        download_directory=None,
+        storage_service_id=None,
+    )
+    fetch_job.total_sips = 2
+    fetch_job.total_dips = 3
+    fetch_job.total_replicas = 5
+
+    assert (
+        "aips: '1'; sips: '2'; dips: '3'; deleted: '4'; replicated: '5'"
+        == task_helpers.summarize_fetch_job_results(fetch_job)
+    )

AIPscan/Aggregator/tests/test_tasks.py

@@ -3,7 +3,6 @@
 import os
 import uuid
 from datetime import datetime
-from io import StringIO
 
 import pytest
 
@@ -14,9 +13,10 @@
     delete_fetch_job,
     delete_storage_service,
     get_mets,
+    handle_deletion,
     make_request,
     parse_package_list_file,
-    parse_packages_and_load_mets,
+    process_packages,
 )
 from AIPscan.Aggregator.tests import (
     INVALID_JSON,
@@ -26,6 +26,7 @@
     VALID_JSON,
     MockResponse,
 )
+from AIPscan.Aggregator.types import StorageServicePackage
 from AIPscan.models import AIP, Agent, FetchJob, StorageService
 
 SCRIPT_DIR = os.path.dirname(os.path.realpath(__file__))
@@ -85,11 +86,7 @@ def mock_download_mets(
 
     # Set up custom logger and add handler to capture output
     customlogger = logging.getLogger(__name__)
-    customlogger.setLevel(logging.DEBUG)
-
-    log_string = StringIO()
-    handler = logging.StreamHandler(log_string)
-    customlogger.addHandler(handler)
+    log_stream = test_helpers.add_logger_streamer(customlogger)
 
     # Create AIP and verify record.
     fetch_job1 = test_helpers.create_test_fetch_job(
@@ -173,7 +170,7 @@ def mock_download_mets(
 
     # Test that custom logger was used
     assert (
-        log_string.getvalue()
+        log_stream.getvalue()
         == f"Processing METS file {os.path.basename(fixture_path)}\n"
     )
 
@@ -248,7 +245,7 @@ def test_parse_package_list_file(tmpdir):
     assert len(package_list) == 0
 
 
-def test_parse_packages_and_load_mets(app_instance, tmpdir, mocker):
+def test_process_packages_json_file_deletion(app_instance, tmpdir, mocker):
     """Test that JSON package lists are deleted after being parsed."""
     json_file_path = tmpdir.join("packages.json")
     json_file_path.write(json.dumps({"objects": []}))
@@ -257,21 +254,92 @@ def test_parse_packages_and_load_mets(app_instance, tmpdir, mocker):
 
     package_list = parse_package_list_file(json_file_path, None, True)
 
-    parse_packages_and_load_mets(package_list, str(datetime.now()), 1, 1, 1)
+    process_packages(package_list, 1, str(datetime.now()), 1, 1, True)
 
     delete_package_json.assert_called_with(json_file_path)
 
 
+def test_process_packages(app_instance, tmpdir, mocker):
+    """Test that JSON package lists are deleted after being parsed."""
+    aip_package_uuid = str(uuid.uuid4())
+    aip_package_data = {
+        "uuid": aip_package_uuid,
+        "package_type": "AIP",
+        "current_path": str(tmpdir),
+    }
+
+    deleted_sip_package_uuid = str(uuid.uuid4())
+    deleted_sip_package_data = {
+        "uuid": deleted_sip_package_uuid,
+        "package_type": "SIP",
+        "current_path": str(tmpdir),
+        "deleted": True,
+    }
+
+    # Write test AIP to JSON file (from which to general a list of packages)
+    json_file_path = tmpdir.join("packages.json")
+    json_file_path.write(
+        json.dumps({"objects": [aip_package_data, deleted_sip_package_data]})
+    )
+
+    # Get test package list
+    package_list = parse_package_list_file(json_file_path, None, True)
+
+    # Process test package list
+    mocker.patch(
+        "AIPscan.Aggregator.database_helpers.create_or_update_storage_location"
+    )
+    mocker.patch("AIPscan.Aggregator.database_helpers.create_or_update_pipeline")
+
+    # Set up custom logger and add handler to capture output
+    customlogger = logging.getLogger(__name__)
+    log_stream = test_helpers.add_logger_streamer(customlogger)
+
+    processed_packages = process_packages(
+        package_list, 1, str(datetime.now()), 1, 1, False, customlogger, 1, 1
+    )
+
+    # Test that custom logger was used
+    assert log_stream.getvalue() == f"Processing {aip_package_uuid} (1 of 1)\n"
+
+    # Make sure only one package was processed and that is was the non-deleted AIP
+    assert len(processed_packages) == 1
+    assert processed_packages[0].aip is True
+
+
+def test_handle_deletion(app_instance, mocker):
+    """Test that delete handler handles deletion correctly."""
+    PACKAGE_UUID = str(uuid.uuid4())
+
+    # Make sure package deleted on storage service gets deleted locally
+    package = StorageServicePackage(uuid=PACKAGE_UUID, deleted=True)
+    mock_delete_aip = mocker.patch("AIPscan.Aggregator.tasks.delete_aip")
+
+    handle_deletion(package)
+
+    mock_delete_aip.assert_called_with(PACKAGE_UUID)
+
+    # Make sure package not deleted on storage service doesn't get deleted
+    package = StorageServicePackage(uuid=PACKAGE_UUID, deleted=False)
+    mock_delete_aip = mocker.patch("AIPscan.Aggregator.tasks.delete_aip")
+
+    handle_deletion(package)
+
+    mock_delete_aip.assert_not_called()
+
+
 def test_delete_aip(app_instance):
     """Test that SS deleted AIPs gets deleted in aipscan.db."""
     PACKAGE_UUID = str(uuid.uuid4())
 
     test_helpers.create_test_aip(uuid=PACKAGE_UUID)
 
+    # Make sure test AIP exists before deletion
     deleted_aip = AIP.query.filter_by(uuid=PACKAGE_UUID).first()
     assert deleted_aip is not None
 
     delete_aip(PACKAGE_UUID)
 
+    # Make sure test AIP doesn't exist after deletion
     deleted_aip = AIP.query.filter_by(uuid=PACKAGE_UUID).first()
     assert deleted_aip is None

AIPscan/test_helpers.py

@@ -1,5 +1,7 @@
+import logging
 import uuid
 from datetime import datetime
+from io import StringIO
 
 from AIPscan import db
 from AIPscan.models import (
@@ -152,3 +154,14 @@ def create_test_event_agent(**kwargs):
     db.session.execute(event_relationship)
     db.session.commit()
     return event_relationship
+
+
+def add_logger_streamer(logger):
+    """Add stream handler to logger and return it."""
+    logger.setLevel(logging.DEBUG)
+
+    log_streamer = StringIO()
+    handler = logging.StreamHandler(log_streamer)
+    logger.addHandler(handler)
+
+    return log_streamer