Add the yearly free limit to the service model.

This allows us to reference it across the API code base and return it in the API.

But not currently attached to the service DB model - a static method on the class.

app/config.py

@@ -239,6 +239,8 @@ class Config(object):
         }
     }
 
+    FREE_SMS_TIER_FRAGMENT_COUNT = 250000
+
 
 ######################
 # Config overrides ###

app/models.py

@@ -217,6 +217,10 @@ class Service(db.Model, Versioned):
             self.can_send_letters = LETTER_TYPE in [p.permission for p in self.permissions]
             self.can_send_international_sms = INTERNATIONAL_SMS_TYPE in [p.permission for p in self.permissions]
 
+    @staticmethod
+    def free_sms_fragment_limit():
+        return current_app.config['FREE_SMS_TIER_FRAGMENT_COUNT']
+
     @classmethod
     def from_json(cls, data):
         """

app/schemas.py

@@ -25,9 +25,8 @@ from notifications_utils.recipients import (
 
 from app import ma
 from app import models
-from app.models import ServicePermission, INTERNATIONAL_SMS_TYPE, SMS_TYPE, LETTER_TYPE, EMAIL_TYPE
+from app.models import ServicePermission, INTERNATIONAL_SMS_TYPE, LETTER_TYPE
 from app.dao.permissions_dao import permission_dao
-from app.dao.service_permissions_dao import dao_fetch_service_permissions
 from app.utils import get_template_instance
 
 
@@ -176,6 +175,7 @@ class ProviderDetailsHistorySchema(BaseSchema):
 
 class ServiceSchema(BaseSchema):
 
+    free_sms_fragment_limit = fields.Method('get_free_sms_fragment_limit')
     created_by = field_for(models.Service, 'created_by', required=True)
     organisation = field_for(models.Service, 'organisation')
     branding = field_for(models.Service, 'branding')
@@ -183,6 +183,9 @@ class ServiceSchema(BaseSchema):
     permissions = fields.Method("service_permissions")
     override_flag = False
 
+    def get_free_sms_fragment_limit(selfs, service):
+        return service.free_sms_fragment_limit()
+
     def service_permissions(self, service):
         return [p.permission for p in service.permissions]
 

tests/app/service/test_rest.py

@@ -147,6 +147,17 @@ def test_get_service_by_id(client, sample_service):
     assert json_resp['data']['sms_sender'] == current_app.config['FROM_NUMBER']
 
 
+def test_get_service_by_id_returns_free_sms_limit(client, sample_service):
+    auth_header = create_authorization_header()
+    resp = client.get(
+        '/service/{}'.format(sample_service.id),
+        headers=[auth_header]
+    )
+    assert resp.status_code == 200
+    json_resp = json.loads(resp.get_data(as_text=True))
+    assert json_resp['data']['free_sms_fragment_limit'] == 250000
+
+
 def test_get_service_list_has_default_permissions(client, service_factory):
     service_factory.get('one')
     service_factory.get('two')