Add server config storage classes

server/lib/python/cartodb_services/cartodb_services/__init__.py

@@ -0,0 +1,35 @@
+# NOTE: This init function must be called from plpythonu entry points to
+# initialize cartodb_services module properly. E.g:
+#
+# CREATE OR REPLACE FUNCTION cdb_dataservices_server.cdb_isochrone(...)
+# RETURNS SETOF cdb_dataservices_server.isoline AS $$
+#
+#     import cartodb_services
+#     cartodb_services.init(plpy, GD)
+#
+#     # rest of the code here
+#     cartodb_services.GD[key] = val
+#     cartodb_services.plpy.execute('SELECT * FROM ...')
+#
+# $$ LANGUAGE plpythonu;
+
+plpy = None
+GD = None
+
+def init(_plpy, _GD):
+    global plpy
+    global GD
+
+    if plpy is None:
+        plpy = _plpy
+
+    if GD is None:
+        GD = _GD
+
+def _reset():
+    # NOTE: just for testing
+    global plpy
+    global GD
+
+    plpy = None
+    GD = None

server/lib/python/cartodb_services/cartodb_services/refactor/storage/interfaces.py

@@ -0,0 +1,11 @@
+import abc
+
+class ConfigStorageInterface(object):
+    """This is an interface that all config storages must abide to"""
+
+    __metaclass__ = abc.ABCMeta
+
+    @abc.abstractmethod
+    def get(self, key):
+        """Return a value based on the key supplied from some storage"""
+        pass

server/lib/python/cartodb_services/cartodb_services/refactor/storage/server_config.py

@@ -0,0 +1,26 @@
+import json
+import cartodb_services
+from interfaces import ConfigStorageInterface
+
+class InDbServerConfigStorage(ConfigStorageInterface):
+
+    def get(self, key):
+        sql = "SELECT cdb_dataservices_server.cdb_conf_getconf('{0}') as conf".format(key)
+        rows = cartodb_services.plpy.execute(sql, 1)
+        json_output = rows[0]['conf']
+        if json_output:
+            return json.loads(json_output)
+        else:
+            return None
+
+
+class InMemoryConfigStorage(ConfigStorageInterface):
+
+    def __init__(self, config_hash={}):
+        self._config_hash = config_hash
+
+    def get(self, key):
+        try:
+            return self._config_hash[key]
+        except KeyError:
+            return None