Add mail_service example

Author: rmk135

examples/miniapps/mail_service/container.py

@@ -0,0 +1,41 @@
+"""Mail service and user registration DI container example."""
+
+from dependency_injector.containers import DeclarativeContainer
+from dependency_injector.providers import Callable, Singleton
+
+import example
+
+
+class Container(DeclarativeContainer):
+ """DI container."""
+
+ mail_service = Singleton(example.MailService,
+ host='localhost',
+ port=587,
+ login='my_login',
+ password='super_secret_password')
+
+ add_user = Callable(example.add_user,
+ mailer=mail_service)
+
+
+if __name__ == '__main__':
+ print('Using real mail service:')
+ Container.add_user('sample@mail.com', 'password')
+ # Using real mail service:
+ # Connecting server localhost:587 with my_login:super_secret_password
+ # Sending "Your password is password" to "sample@mail.com"
+
+ print('Using mail service stub:')
+ Container.add_user('sample@mail.com', 'password',
+ mailer=example.MailServiceStub())
+ # Using mail service stub:
+ # Emulating sending "Your password is password" to "sample@mail.com"
+
+ # Also you can override provider by another provider:
+ Container.mail_service.override(Singleton(example.MailServiceStub))
+ print('Using mail service stub by overriding mail service provider:')
+ Container.add_user('sample@mail.com', 'password')
+ # Using mail service stub by overriding mail service provider:
+ # Emulating sending "Your password is password" to "sample@mail.com"
+ Container.mail_service.reset_override() # Resetting provider overriding

examples/miniapps/mail_service/example.py

@@ -0,0 +1,39 @@
+"""Mail service and user registration example."""
+
+
+class AbstractMailService(object):
+ """Abstract mail service."""
+
+ def send(self, email, body):
+ """Send email."""
+ raise NotImplementedError()
+
+
+class MailService(AbstractMailService):
+ """Mail service."""
+
+ def __init__(self, host, port, login, password):
+ """Initializer."""
+ self._host = host
+ self._port = port
+ self._login = login
+ self._password = password
+
+ def send(self, email, body):
+ """Send email."""
+ print('Connecting server {0}:{1} with {2}:{3}'.format(
+ self._host, self._port, self._login, self._password))
+ print('Sending "{0}" to "{1}"'.format(body, email))
+
+
+class MailServiceStub(AbstractMailService):
+ """Mail service stub."""
+
+ def send(self, email, body):
+ """Send email."""
+ print('Emulating sending "{0}" to "{1}"'.format(body, email))
+
+
+def add_user(email, password, mailer):
+ """Register user."""
+ mailer.send(email, 'Your password is {0}'.format(password))