Add latest containers module updates + movie_lister refactoring

dependency_injector/containers.py

@@ -2,7 +2,10 @@
 
 import six
 
-from dependency_injector import utils
+from dependency_injector import (
+    utils,
+    errors,
+)
 
 
 class DeclarativeContainerMetaClass(type):
@@ -21,6 +24,7 @@ class DeclarativeContainerMetaClass(type):
 
         attributes['cls_providers'] = dict(cls_providers)
         attributes['inherited_providers'] = dict(inherited_providers)
+        attributes['providers'] = dict(cls_providers + inherited_providers)
 
         return type.__new__(mcs, class_name, bases, attributes)
 
@@ -32,62 +36,69 @@ class DeclarativeContainerMetaClass(type):
         """
         if utils.is_provider(value):
             cls.providers[name] = value
+            cls.cls_providers[name] = value
         super(DeclarativeContainerMetaClass, cls).__setattr__(name, value)
 
+    def __delattr__(cls, name):
+        """Delete class attribute.
 
-class Container(object):
-    """Inversion of control container."""
-
-    __IS_CATALOG__ = True
-
-    def __init__(self):
-        """Initializer."""
-        self.providers = dict()
-
-    def bind_providers(self, **providers):
-        """Bind providers to the container."""
-        for name, provider in six.iteritems(providers):
-            setattr(self, name, utils.ensure_is_provider(provider))
-        return self
-
-    def __setattr__(self, name, value):
-        """Set instance attribute.
-
-        If value of attribute is provider, it will be added into providers
+        If value of attribute is provider, it will be deleted from providers
         dictionary.
         """
-        if utils.is_provider(value):
-            self.providers[name] = value
-        super(Container, self).__setattr__(name, value)
+        if name in cls.providers and name in cls.cls_providers:
+            del cls.providers[name]
+            del cls.cls_providers[name]
+        super(DeclarativeContainerMetaClass, cls).__delattr__(name)
 
 
 @six.add_metaclass(DeclarativeContainerMetaClass)
 class DeclarativeContainer(object):
     """Declarative inversion of control container."""
 
+    __IS_CATALOG__ = True
+
+    providers = dict()
     cls_providers = dict()
     inherited_providers = dict()
 
-    def __init__(self):
-        """Initializer."""
-        self.providers = dict()
-        self.providers.update(self.__class__.inherited_providers)
-        self.providers.update(self.__class__.cls_providers)
-        super(DeclarativeContainer, self).__init__()
+    overridden_by = tuple()
+
+    @classmethod
+    def override(cls, overriding):
+        """Override current container by overriding container.
+
+        :param overriding: Overriding container.
+        :type overriding: :py:class:`DeclarativeContainer`
+
+        :raise: :py:exc:`dependency_injector.errors.Error` if trying to
+                override container by itself or its subclasses
+
+        :rtype: None
+        """
+        if issubclass(cls, overriding):
+            raise errors.Error('Catalog {0} could not be overridden '
+                               'with itself or its subclasses'.format(cls))
+
+        cls.overridden_by += (overriding,)
+
+        for name, provider in six.iteritems(overriding.cls_providers):
+            try:
+                getattr(cls, name).override(provider)
+            except AttributeError:
+                pass
 
 
-def override(declarative_container):
+def override(container):
     """:py:class:`DeclarativeContainer` overriding decorator.
 
-    :param declarative_container: Container that should be overridden by
-                                  decorated container.
-    :type declarative_container: :py:class:`DeclarativeContainer`
+    :param catalog: Container that should be overridden by decorated container.
+    :type catalog: :py:class:`DeclarativeContainer`
 
     :return: Declarative container's overriding decorator.
     :rtype: callable(:py:class:`DeclarativeContainer`)
     """
     def decorator(overriding_container):
         """Overriding decorator."""
-        declarative_container.override(overriding_container)
+        container.override(overriding_container)
         return overriding_container
     return decorator

examples/miniapps/movie_lister/app_csv.py

@@ -9,7 +9,7 @@ This mini application uses ``movies`` library, that is configured to work with
 csv file movies database.
 """
 
-from dependency_injector import catalogs
+from dependency_injector import containers
 from dependency_injector import providers
 from dependency_injector import injections
 
@@ -19,12 +19,12 @@ from movies import finders
 from settings import MOVIES_CSV_PATH
 
 
-@catalogs.override(MoviesModule)
-class MyMoviesModule(catalogs.DeclarativeCatalog):
-    """Customized catalog of movies module component providers."""
+@containers.override(MoviesModule)
+class MyMoviesModule(containers.DeclarativeContainer):
+    """IoC container for overriding movies module component providers."""
 
     movie_finder = providers.Factory(finders.CsvMovieFinder,
-                                     *MoviesModule.movie_finder.injections,
+                                     movie_model=MoviesModule.movie_model,
                                      csv_file=MOVIES_CSV_PATH,
                                      delimeter=',')
 

examples/miniapps/movie_lister/app_db.py

@@ -11,7 +11,7 @@ sqlite movies database.
 
 import sqlite3
 
-from dependency_injector import catalogs
+from dependency_injector import containers
 from dependency_injector import providers
 from dependency_injector import injections
 
@@ -21,18 +21,18 @@ from movies import finders
 from settings import MOVIES_DB_PATH
 
 
-class ApplicationModule(catalogs.DeclarativeCatalog):
-    """Catalog of application component providers."""
+class ApplicationModule(containers.DeclarativeContainer):
+    """IoC container of application component providers."""
 
     database = providers.Singleton(sqlite3.connect, MOVIES_DB_PATH)
 
 
-@catalogs.override(MoviesModule)
-class MyMoviesModule(catalogs.DeclarativeCatalog):
-    """Customized catalog of movies module component providers."""
+@containers.override(MoviesModule)
+class MyMoviesModule(containers.DeclarativeContainer):
+    """IoC container for overriding movies module component providers."""
 
     movie_finder = providers.Factory(finders.SqliteMovieFinder,
-                                     *MoviesModule.movie_finder.injections,
+                                     movie_model=MoviesModule.movie_model,
                                      database=ApplicationModule.database)
 
 

examples/miniapps/movie_lister/app_db_csv.py

@@ -11,7 +11,7 @@ sqlite movies database and csv file movies database.
 
 import sqlite3
 
-from dependency_injector import catalogs
+from dependency_injector import containers
 from dependency_injector import providers
 from dependency_injector import injections
 
@@ -22,27 +22,27 @@ from settings import MOVIES_CSV_PATH
 from settings import MOVIES_DB_PATH
 
 
-class ApplicationModule(catalogs.DeclarativeCatalog):
-    """Catalog of application component providers."""
+class ApplicationModule(containers.DeclarativeContainer):
+    """IoC container of application component providers."""
 
     database = providers.Singleton(sqlite3.connect, MOVIES_DB_PATH)
 
 
-@catalogs.copy(MoviesModule)
+@containers.copy(MoviesModule)
 class DbMoviesModule(MoviesModule):
-    """Customized catalog of movies module component providers."""
+    """IoC container for overriding movies module component providers."""
 
     movie_finder = providers.Factory(finders.SqliteMovieFinder,
-                                     *MoviesModule.movie_finder.injections,
+                                     movie_model=MoviesModule.movie_model,
                                      database=ApplicationModule.database)
 
 
-@catalogs.copy(MoviesModule)
+@containers.copy(MoviesModule)
 class CsvMoviesModule(MoviesModule):
-    """Customized catalog of movies module component providers."""
+    """IoC container for overriding movies module component providers."""
 
     movie_finder = providers.Factory(finders.CsvMovieFinder,
-                                     *MoviesModule.movie_finder.injections,
+                                     movie_model=MoviesModule.movie_model,
                                      csv_file=MOVIES_CSV_PATH,
                                      delimeter=',')
 

examples/miniapps/movie_lister/movies/__init__.py

@@ -1,9 +1,9 @@
 """Movies package.
 
-Top-level package of movies library. This package contains catalog of movies
-module component providers - ``MoviesModule``. It is recommended to use movies
-library functionality by fetching required instances from ``MoviesModule``
-providers.
+Top-level package of movies library. This package contains IoC container of
+movies module component providers - ``MoviesModule``. It is recommended to use
+movies library functionality by fetching required instances from
+``MoviesModule`` providers.
 
 ``MoviesModule.movie_finder`` is a factory that provides abstract component
 ``finders.MovieFinder``. This provider should be overridden by provider of
@@ -12,7 +12,7 @@ concrete finder implementation in terms of library configuration.
 Each of ``MoviesModule`` providers could be overridden.
 """
 
-from dependency_injector import catalogs
+from dependency_injector import containers
 from dependency_injector import providers
 
 from . import finders
@@ -20,8 +20,8 @@ from . import listers
 from . import models
 
 
-class MoviesModule(catalogs.DeclarativeCatalog):
-    """Catalog of movies module component providers."""
+class MoviesModule(containers.DeclarativeContainer):
+    """IoC container of movies module component providers."""
 
     movie_model = providers.DelegatedFactory(models.Movie)
 

tests/test_containers.py

@@ -0,0 +1,95 @@
+"""Dependency injector container unit tests."""
+
+import unittest2 as unittest
+
+from dependency_injector import (
+    containers,
+    providers,
+)
+
+
+class ContainerA(containers.DeclarativeContainer):
+    """Declarative IoC container A."""
+
+    p11 = providers.Provider()
+    p12 = providers.Provider()
+
+
+class ContainerB(ContainerA):
+    """Declarative IoC container B.
+
+    Extends container A.
+    """
+
+    p21 = providers.Provider()
+    p22 = providers.Provider()
+
+
+class DeclarativeContainerTests(unittest.TestCase):
+    """Declarative container tests."""
+
+    def test_providers_attribute_with(self):
+        """Test providers attribute."""
+        self.assertEqual(ContainerA.providers, dict(p11=ContainerA.p11,
+                                                    p12=ContainerA.p12))
+        self.assertEqual(ContainerB.providers, dict(p11=ContainerA.p11,
+                                                    p12=ContainerA.p12,
+                                                    p21=ContainerB.p21,
+                                                    p22=ContainerB.p22))
+
+    def test_cls_providers_attribute_with(self):
+        """Test cls_providers attribute."""
+        self.assertEqual(ContainerA.cls_providers, dict(p11=ContainerA.p11,
+                                                        p12=ContainerA.p12))
+        self.assertEqual(ContainerB.cls_providers, dict(p21=ContainerB.p21,
+                                                        p22=ContainerB.p22))
+
+    def test_inherited_providers_attribute(self):
+        """Test inherited_providers attribute."""
+        self.assertEqual(ContainerA.inherited_providers, dict())
+        self.assertEqual(ContainerB.inherited_providers,
+                         dict(p11=ContainerA.p11,
+                              p12=ContainerA.p12))
+
+    def test_set_get_del_provider_attribute(self):
+        """Test set/get/del provider attributes."""
+        a_p13 = providers.Provider()
+        b_p23 = providers.Provider()
+
+        ContainerA.p13 = a_p13
+        ContainerB.p23 = b_p23
+
+        self.assertEqual(ContainerA.providers, dict(p11=ContainerA.p11,
+                                                    p12=ContainerA.p12,
+                                                    p13=a_p13))
+        self.assertEqual(ContainerB.providers, dict(p11=ContainerA.p11,
+                                                    p12=ContainerA.p12,
+                                                    p21=ContainerB.p21,
+                                                    p22=ContainerB.p22,
+                                                    p23=b_p23))
+
+        self.assertEqual(ContainerA.cls_providers, dict(p11=ContainerA.p11,
+                                                        p12=ContainerA.p12,
+                                                        p13=a_p13))
+        self.assertEqual(ContainerB.cls_providers, dict(p21=ContainerB.p21,
+                                                        p22=ContainerB.p22,
+                                                        p23=b_p23))
+
+        del ContainerA.p13
+        del ContainerB.p23
+
+        self.assertEqual(ContainerA.providers, dict(p11=ContainerA.p11,
+                                                    p12=ContainerA.p12))
+        self.assertEqual(ContainerB.providers, dict(p11=ContainerA.p11,
+                                                    p12=ContainerA.p12,
+                                                    p21=ContainerB.p21,
+                                                    p22=ContainerB.p22))
+
+        self.assertEqual(ContainerA.cls_providers, dict(p11=ContainerA.p11,
+                                                        p12=ContainerA.p12))
+        self.assertEqual(ContainerB.cls_providers, dict(p21=ContainerB.p21,
+                                                        p22=ContainerB.p22))
+
+
+if __name__ == '__main__':
+    unittest.main()