Send zendesk ticket when services found with high failure rates

tests/app/celery/test_scheduled_tasks.py

@@ -16,6 +16,7 @@ from app.celery.scheduled_tasks import (
     check_precompiled_letter_state,
     check_templated_letter_state,
     check_for_missing_rows_in_completed_jobs,
+    check_for_services_with_high_failure_rates_or_sending_to_tv_numbers,
     switch_current_sms_provider_on_slow_delivery,
 )
 from app.config import QueueNames, TaskNames
@@ -494,3 +495,30 @@ def test_check_for_missing_rows_in_completed_jobs_uses_sender_id(mocker, sample_
     mock_process_row.assert_called_once_with(
         mock.ANY, mock.ANY, job, job.service, sender_id=fake_uuid
     )
+
+
+@pytest.mark.parametrize("failure_rates, expected_message", [
+    [
+        [{"id": "123", "name": "Service 1", "permanent_failure_rate": 0.3}],
+        "1 service(s) have had high permanent-failure rates for sms messages in last "
+        "24 hours: service id: 123 failure rate: 0.3, "
+    ]
+])
+def test_check_for_services_with_high_failure_rates_or_sending_to_tv_numbers(
+    mocker, notify_db_session, failure_rates, expected_message
+):
+    mock_logger = mocker.patch('app.celery.tasks.current_app.logger.exception')
+    mock_create_ticket = mocker.patch('app.celery.scheduled_tasks.zendesk_client.create_ticket')
+    mock_failure_rates = mocker.patch(
+        'app.celery.scheduled_tasks.get_services_with_high_failure_rates', return_value=failure_rates
+    )
+
+    check_for_services_with_high_failure_rates_or_sending_to_tv_numbers()
+
+    assert mock_failure_rates.called
+    mock_logger.assert_called_once_with(expected_message)
+    mock_create_ticket.assert_called_with(
+        message=expected_message,
+        subject="[test] High failure rates for sms spotted for services",
+        ticket_type='incident'
+    )

tests/app/service/test_statistics.py

@@ -6,12 +6,13 @@ from freezegun import freeze_time
 import pytest
 
 from app.service.statistics import (
-    format_admin_stats,
-    format_statistics,
+    add_monthly_notification_status_stats,
+    create_empty_monthly_notification_status_stats_dict,
     create_stats_dict,
     create_zeroed_stats_dicts,
-    create_empty_monthly_notification_status_stats_dict,
-    add_monthly_notification_status_stats
+    format_admin_stats,
+    format_statistics,
+    get_rate_of_permanent_failures_for_service
 )
 
 StatsRow = collections.namedtuple('row', ('notification_type', 'status', 'count'))
@@ -73,6 +74,32 @@ def test_format_statistics(stats, email_counts, sms_counts, letter_counts):
     }
 
 
+@pytest.mark.idparametrize("statistics, expected_result", {
+    'counts_rate_for_sms': ([
+        StatsRow('sms', 'permanent-failure', 100),
+        StatsRow('sms', 'delivered', 300),
+    ], 0.25),
+    'ignores_other_notification_types': ([
+        StatsRow('sms', 'permanent-failure', 100),
+        StatsRow('sms', 'delivered', 300),
+        StatsRow('email', 'delivered', 300),
+        StatsRow('letter', 'created', 300),
+    ], 0.25),
+    'only_counts_permanent_failure_as_failed': ([
+        StatsRow('sms', 'permanent-failure', 100),
+        StatsRow('sms', 'temporary-failure', 100),
+        StatsRow('sms', 'delivered', 300),
+    ], 0.2),
+    'below_threshold': ([
+        StatsRow('sms', 'permanent-failure', 5),
+        StatsRow('sms', 'delivered', 3),
+    ], 0),
+})
+def test_get_rate_of_permanent_failures_for_service(statistics, expected_result):
+    rate = get_rate_of_permanent_failures_for_service(statistics)
+    assert rate == expected_result
+
+
 def test_create_zeroed_stats_dicts():
     assert create_zeroed_stats_dicts() == {
         'sms': {'requested': 0, 'delivered': 0, 'failed': 0},

tests/app/service/test_utils.py

@@ -1,5 +1,7 @@
 from app.dao.date_util import get_current_financial_year_start_year
 from freezegun import freeze_time
+from tests.app.db import create_service, create_notification, create_template
+from app.service.utils import get_services_with_high_failure_rates
 
 
 # see get_financial_year for conversion of financial years.
@@ -13,3 +15,33 @@ def test_get_current_financial_year_start_year_before_march():
 def test_get_current_financial_year_start_year_after_april():
     current_fy = get_current_financial_year_start_year()
     assert current_fy == 2017
+
+
+@freeze_time("2019-12-02 12:00:00.000000")
+def test_get_services_with_high_failure_rates(notify_db_session):
+    service_1 = create_service(service_name="Service 1")
+    service_3 = create_service(service_name="Service 3", restricted=True)  # restricted
+    service_4 = create_service(service_name="Service 4", research_mode=True)  # research mode
+    service_5 = create_service(service_name="Service 5", active=False)  # not active
+    services = [service_1, service_3, service_4, service_5]
+    for service in services:
+        template = create_template(service)
+        create_notification(template, status="permanent-failure")
+        for x in range(0, 3):
+            create_notification(template, status="delivered")
+
+    service_6 = create_service(service_name="Service 6")  # notifications too old
+    with freeze_time("2019-11-30 15:00:00.000000"):
+        template_6 = create_template(service_6)
+        for x in range(0, 4):
+            create_notification(template_6, status="permanent-failure")
+
+    service_2 = create_service(service_name="Service 2")  # below threshold
+    template_2 = create_template(service_2)
+    create_notification(template_2, status="permanent-failure")
+
+    assert get_services_with_high_failure_rates(threshold=3) == [{
+        'id': str(service_1.id),
+        'name': service_1.name,
+        'permanent_failure_rate': 0.25
+    }]