Adds in call to new rate limit method in the redis client

- both V1 and V2 APIs
- Rate limiting wrapped into a new method - check_rate_limiting
	- delegates to the previous daily limit and the new though put limit
- Rate limiting done on key type. Each key has it's own limit (number of requests) and interval (time period of requests)
- Configured in the config. Not done on a per-env basis though could be in the future.

app/notifications/validators.py

@@ -4,12 +4,26 @@ from notifications_utils.recipients import validate_and_format_phone_number, val
 from app.dao import services_dao
 from app.models import KEY_TYPE_TEST, KEY_TYPE_TEAM, SMS_TYPE
 from app.service.utils import service_allowed_to_send_to
-from app.v2.errors import TooManyRequestsError, BadRequestError
+from app.v2.errors import TooManyRequestsError, BadRequestError, RateLimitError
 from app import redis_store
 from notifications_utils.clients import redis
 
 
-def check_service_message_limit(key_type, service):
+def check_service_over_api_rate_limit(service, api_key):
+    cache_key = redis.rate_limit_cache_key(service.id, api_key.key_type)
+    rate_limit = current_app.config['API_KEY_LIMITS'][api_key.key_type]['limit']
+    interval = current_app.config['API_KEY_LIMITS'][api_key.key_type]['interval']
+    if redis_store.exceeded_rate_limit(
+            cache_key,
+            rate_limit,
+            interval):
+        raise RateLimitError(
+            rate_limit,
+            interval,
+            api_key.key_type)
+
+
+def check_service_over_daily_message_limit(key_type, service):
     if key_type != KEY_TYPE_TEST:
         cache_key = redis.daily_limit_cache_key(service.id)
         service_stats = redis_store.get(cache_key)
@@ -20,6 +34,11 @@ def check_service_message_limit(key_type, service):
             raise TooManyRequestsError(service.message_limit)
 
 
+def check_rate_limiting(service, api_key):
+    check_service_over_api_rate_limit(service, api_key)
+    check_service_over_daily_message_limit(api_key.key_type, service)
+
+
 def check_template_is_for_notification_type(notification_type, template_type):
     if notification_type != template_type:
         message = "{0} template is not suitable for {1} notification".format(template_type,
@@ -55,8 +74,6 @@ def validate_and_format_recipient(send_to, key_type, service, notification_type)
 
 def check_sms_content_char_count(content_count):
     char_count_limit = current_app.config.get('SMS_CHAR_COUNT_LIMIT')
-    if (
-        content_count > char_count_limit
-    ):
+    if content_count > char_count_limit:
         message = 'Content for template has a character count greater than the limit of {}'.format(char_count_limit)
         raise BadRequestError(message=message)