Merge pull request #1436 from jotagesales/config_from_object_string

Config from object string

sanic/config.py

@@ -2,6 +2,7 @@ import os
 import types
 
 from sanic.exceptions import PyFileError
+from sanic.helpers import import_string
 
 
 SANIC_PREFIX = "SANIC_"
@@ -102,6 +103,9 @@ class Config(dict):
             from yourapplication import default_config
             app.config.from_object(default_config)
 
+            or also:
+            app.config.from_object('myproject.config.MyConfigClass')
+
         You should not use this function to load the actual configuration but
         rather configuration defaults. The actual config should be loaded
         with :meth:`from_pyfile` and ideally from a location not within the
@@ -109,6 +113,8 @@ class Config(dict):
 
         :param obj: an object holding the configuration
         """
+        if isinstance(obj, str):
+            obj = import_string(obj)
         for key in dir(obj):
             if key.isupper():
                 self[key] = getattr(obj, key)

sanic/helpers.py

@@ -1,5 +1,9 @@
 """Defines basics of HTTP standard."""
 
+from importlib import import_module
+from inspect import ismodule
+
+
 STATUS_CODES = {
     100: b"Continue",
     101: b"Switching Protocols",
@@ -131,3 +135,21 @@ def remove_entity_headers(headers, allowed=("content-location", "expires")):
         if not is_entity_header(header) or header.lower() in allowed
     }
     return headers
+
+
+def import_string(module_name, package=None):
+    """
+    import a module or class by string path.
+
+    :module_name: str with path of module or path to import and
+    instanciate a class
+    :returns: a module object or one instance from class if
+    module_name is a valid path to class
+
+    """
+    module, klass = module_name.rsplit(".", 1)
+    module = import_module(module, package=package)
+    obj = getattr(module, klass)
+    if ismodule(obj):
+        return obj
+    return obj()