Move check_messages in admin over to using get notification stats for

day.

app/main/views/send.py

@@ -1,5 +1,6 @@
 import json
 import itertools
+from datetime import datetime
 from string import ascii_uppercase
 
 from contextlib import suppress
@@ -205,12 +206,16 @@ def send_from_api(service_id, template_id):
 @login_required
 @user_has_permissions('send_texts', 'send_emails', 'send_letters')
 def check_messages(service_id, template_type, upload_id):
+
     if not session.get('upload_data'):
         return redirect(url_for('main.choose_template', service_id=service_id, template_type=template_type))
 
     users = user_api_client.get_users_for_service(service_id=service_id)
-    statistics = statistics_api_client.get_statistics_for_service(service_id, limit_days=1)['data']
-    statistics = statistics[0] if statistics else {}
+    today = datetime.today().date().strftime('%Y-%m-%d')
+
+    statistics = statistics_api_client.get_statistics_for_service_for_day(service_id, today)
+    if not statistics:
+        statistics = {}
 
     contents = s3download(service_id, upload_id)
     if not contents:

app/notify_client/statistics_api_client.py

@@ -1,4 +1,5 @@
 from notifications_python_client.base import BaseAPIClient
+from notifications_python_client.errors import HTTPError
 
 
 class StatisticsApiClient(BaseAPIClient):
@@ -21,6 +22,16 @@ class StatisticsApiClient(BaseAPIClient):
             params=params
         )
 
+    def get_statistics_for_service_for_day(self, service_id, day):
+        url = '/service/{}/notifications-statistics/day/{}'.format(service_id, day)
+        try:
+            return self.get(url=url)['data']
+        except HTTPError as e:
+            if e.status_code == 404:
+                return None
+            else:
+                raise e
+
     def get_7_day_aggregate_for_service(self, service_id, date_from=None, week_count=None):
         params = {}
         if date_from is not None: