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133 lines
4.6 KiB
ReStructuredText
133 lines
4.6 KiB
ReStructuredText
.. _decoupled-packages:
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Decoupled packages example (multiple containers)
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================================================
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.. meta::
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:keywords: Python,Dependency Injection,Inversion of Control,Container,Example,Application,
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Framework,AWS,boto3,client
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:description: This example shows how to use Dependency Injector to create Python decoupled packages.
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To achieve a decoupling each package has a container with the components. When
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a component needs a dependency from the outside of the package scope we use the
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Dependency provider. The package container has no knowledge on where the
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dependencies come from. It states a need that the dependencies must be provided.
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This helps to decouple a package from the 3rd party dependencies and other
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packages.
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This example shows how to use ``Dependency Injector`` to create decoupled packages.
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To achieve a decoupling each package has a container with the components. When a component needs a
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dependency from the outside of the package scope we use the ``Dependency`` provider. The package
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container has no knowledge on where the dependencies come from. It states a need that the
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dependencies must be provided. This helps to decouple a package from the 3rd party dependencies
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and other packages.
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To wire the packages we use an application container. Application container has all 3rd party
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dependencies and package containers. It wires the packages and dependencies to create a
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complete application.
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We build an example micro application that consists of 3 packages:
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- ``user`` - a package with user domain logic, depends on a database
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- ``photo`` - a package with photo domain logic, depends on a database and AWS S3
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- ``analytics`` - a package with analytics domain logic, depends on the ``user`` and ``photo``
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package components
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.. image:: images/decoupled-packages.png
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:width: 100%
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:align: center
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Start from the scratch or jump to the section:
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.. contents::
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:local:
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:backlinks: none
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You can find the source code and instructions for running on the `Github <https://github.com/ets-labs/python-dependency-injector/tree/master/examples/miniapps/decoupled-packages>`_.
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Application structure
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---------------------
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Application consists of an ``example`` package, a configuration file and a ``requirements.txt``
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file.
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.. code-block:: bash
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./
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├── example/
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│ ├── analytics/
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│ │ ├── __init__.py
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│ │ ├── containers.py
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│ │ └── services.py
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│ ├── photo/
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│ │ ├── __init__.py
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│ │ ├── containers.py
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│ │ ├── entities.py
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│ │ └── repositories.py
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│ ├── user/
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│ │ ├── __init__.py
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│ │ ├── containers.py
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│ │ ├── entities.py
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│ │ └── repositories.py
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│ ├── __init__.py
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│ ├── __main__.py
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│ └── containers.py
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├── config.ini
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└── requirements.txt
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Package containers
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------------------
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Listing of the ``example/user/containers.py``:
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.. literalinclude:: ../../examples/miniapps/decoupled-packages/example/user/containers.py
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:language: python
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Listing of the ``example/photo/containers.py``:
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.. literalinclude:: ../../examples/miniapps/decoupled-packages/example/photo/containers.py
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:language: python
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Listing of the ``example/analytics/containers.py``:
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.. literalinclude:: ../../examples/miniapps/decoupled-packages/example/analytics/containers.py
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:language: python
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Application container
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---------------------
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Application container consists of all packages and 3rd party dependencies. Its role is to wire
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everything together in a complete application.
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Listing of the ``example/containers.py``:
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.. literalinclude:: ../../examples/miniapps/decoupled-packages/example/containers.py
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:language: python
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.. note::
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Package ``analytics`` has dependencies on the repositories from the ``user`` and
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``photo`` packages. This is an example of how you can pass the dependencies from one package
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to another.
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Main module
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-----------
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Listing of the ``example/__main__.py``:
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.. literalinclude:: ../../examples/miniapps/decoupled-packages/example/__main__.py
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:language: python
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Configuration
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-------------
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Listing of the ``config.ini``:
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.. literalinclude:: ../../examples/miniapps/decoupled-packages/config.ini
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:language: ini
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Run the application
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-------------------
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You can find the source code and instructions for running on the `Github <https://github.com/ets-labs/python-dependency-injector/tree/master/examples/miniapps/decoupled-packages>`_.
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.. disqus::
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