Change "cannot connect to redid" to be a raised exception

data/buildlogs.py

@@ -1,6 +1,8 @@
 import redis
 import json
 
+class BuildStatusRetrievalError(Exception):
+  pass
 
 class BuildLogs(object):
   ERROR = 'error'
@@ -45,7 +47,7 @@ class BuildLogs(object):
       log_entries = self._redis.lrange(self._logs_key(build_id), start_index, -1)
       return (llen, (json.loads(entry) for entry in log_entries))
     except redis.ConnectionError:
-      return (0, [])
+      raise BuildStatusRetrievalError('Cannot retrieve build logs')
 
   @staticmethod
   def _status_key(build_id):
@@ -65,6 +67,6 @@ class BuildLogs(object):
     try:
       fetched = self._redis.get(self._status_key(build_id))
     except redis.ConnectionError:
-      return None
+      raise BuildStatusRetrievalError('Cannot retrieve build status')
 
     return json.loads(fetched) if fetched else None

endpoints/api/build.py

@@ -11,6 +11,7 @@ from endpoints.common import start_build
 from endpoints.trigger import BuildTrigger
 from data import model
 from auth.permissions import ModifyRepositoryPermission
+from data.buildlogs import BuildStatusRetrievalError
 
 
 logger = logging.getLogger(__name__)
@@ -48,7 +49,11 @@ def trigger_view(trigger):
 
 
 def build_status_view(build_obj, can_write=False):
+  try:
     status = build_logs.get_status(build_obj.uuid)
+  except BuildStatusRetrievalError:
+    status = None
+
   logger.debug('Can write: %s job_config: %s', can_write, build_obj.job_config)
   resp = {
     'id': build_obj.uuid,
@@ -169,7 +174,10 @@ class RepositoryBuildLogs(RepositoryParamResource):
 
     start = int(request.args.get('start', 0))
 
+    try:
       count, logs = build_logs.get_log_entries(build.uuid, start)
+    except BuildStatusRetrievalError:
+      count, logs = (0, [])
 
     response_obj.update({
       'start': start,