Modify config field to use base api endpoint

allow streaming from gzipped tarball config

config_app/config_endpoints/api/tar_config_loader.py

@@ -1,5 +1,4 @@
 import tarfile
-import cStringIO
 
 from flask import request, make_response
 
@@ -13,16 +12,12 @@ class TarConfigLoader(ApiResource):
     """ Resource for validating a block of configuration against an external service. """
 
     @nickname('uploadTarballConfig')
-    def post(self):
+    def put(self):
         """ Loads tarball config into the config provider """
         input_stream = request.stream
+        tar_stream = tarfile.open(mode="r|gz", fileobj=input_stream)
 
-        # since we're working with a tar file, shouldn't be larger than ~20KB, so just read the whole thing into mem
-        buf = input_stream.read()
-        config = tarfile.open(mode="r:gz", fileobj=cStringIO.StringIO(buf))
-
-        # TODO(sam): refactor config provider to accept a stream write to avoid loading into memory
-        config_provider.load_from_tarball(config)
+        config_provider.load_from_tar_stream(tar_stream)
 
         # now try to connect to the db provided in their config
         combined = dict(**app.config)