config: store binary configs

appengine/components/components/config/fs.py

 # Copyright 2015 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 """fs.Provider reads configs from the filesystem."""
 
 import logging
 import os
 
 from google.appengine.ext import ndb
@@ skipping 10 matching lines @@
 
   Some functions are made NDB tasklets because they follow common interface.
   See api._get_config_provider for context.
   """
 
   def __init__(self, root):
     assert root
     self.root = root
 
   @ndb.tasklet
-  def get_async(self, config_set, path, **kwargs):
+  def get_async(self, config_set, path, dest_type=None, **kwargs):
     """Reads a (revision, config) from a file, where revision is always None.
 
     Kwargs are not used, but reported as warnings.
     """
     assert config_set
     assert path
     if kwargs:
       logging.warning(
           'config: parameters %r are ignored in the filesystem mode',
           kwargs.keys())
     filename = os.path.join(
         self.root,
         config_set.replace('/', os.path.sep),
         SEPARATOR,
         path.replace('/', os.path.sep))
     filename = os.path.abspath(filename)
     assert filename.startswith(os.path.abspath(self.root)), filename
     content = None
     if os.path.exists(filename):
       with open(filename, 'r') as f:
         content = f.read()
-    raise ndb.Return((None, content))
+    config = common._convert_config(content, dest_type)
+    raise ndb.Return(None, config)
 
   def get_project_ids(self):
     # A project_id cannot contain a slash, so recursion is not needed.
     projects_dir = os.path.join(self.root, 'projects')
     if not os.path.isdir(projects_dir):
       return
     for pid in os.listdir(projects_dir):
       if os.path.isdir(os.path.join(projects_dir, pid)):
         yield pid
 
@@ skipping 54 matching lines @@
     """Returns URL of where configs for given config set are stored.
 
     Returns:
       Always None for file system.
     """
     raise ndb.Return(None)
 
 
 def get_provider():  # pragma: no cover
   return Provider(common.CONSTANTS.CONFIG_DIR)