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Update flask example and tutorial

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This commit is contained in:
Roman Mogylatov 2021-10-28 21:51:17 -04:00
parent 2ce4a1c6b9
commit f531de3138
4 changed files with 49 additions and 61 deletions
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92
docs/tutorials/flask.rst
View File

@ -112,7 +112,7 @@ You should see something like:
(venv) $ python -c "import dependency_injector; print(dependency_injector.__version__)"
4.37.0
(venv) $ python -c "import flask; print(flask.__version__)"
1.1.2
2.0.2
*Versions can be different. That's fine.*
@ -444,9 +444,10 @@ and run in the terminal:
Now we need to add Github API client the container. We will need to add two more providers from
the ``dependency_injector.providers`` module:
- ``Factory`` provider that will create ``Github`` client.
- ``Configuration`` provider that will be used for providing the API token and the request timeout
for the ``Github`` client.
- ``Factory`` provider. It will create a ``Github`` client.
- ``Configuration`` provider. It will provide an API token and a request timeout for the ``Github`` client.
We will specify the location of the configuration file. The configuration provider will parse
the configuration file when we create a container instance.
Edit ``containers.py``:
@ -461,7 +462,7 @@ Edit ``containers.py``:
class Container(containers.DeclarativeContainer):
config = providers.Configuration()
config = providers.Configuration(yaml_files=["config.yml"])
github_client = providers.Factory(
Github,
@ -469,23 +470,14 @@ Edit ``containers.py``:
timeout=config.github.request_timeout,
)
.. note::
We have used the configuration value before it was defined. That's the principle how
``Configuration`` provider works.
Use first, define later.
.. note::
Don't forget to remove the Ellipsis ``...`` from the container. We don't need it anymore
since we container is not empty.
Now let's add the configuration file.
We will use YAML.
Create an empty file ``config.yml`` in the root of the project:
Now let's add the configuration file. We will use YAML. Create an empty file ``config.yml``
in the root of the project:
.. code-block:: bash
:emphasize-lines: 11
@ -530,17 +522,13 @@ and install it:
pip install -r requirements.txt
We will use environment variable ``GITHUB_TOKEN`` to provide the API token.
Now we need to edit ``create_app()`` to make two things when application starts:
- Load the configuration file the ``config.yml``.
- Load the API token from the ``GITHUB_TOKEN`` environment variable.
We will use the ``GITHUB_TOKEN`` environment variable to provide the API token. Let's edit
``create_app()`` to fetch the token value from it.
Edit ``application.py``:
.. code-block:: python
:emphasize-lines: 12-13
:emphasize-lines: 12
"""Application module."""
@ -553,7 +541,6 @@ Edit ``application.py``:
def create_app() -> Flask:
container = Container()
container.config.from_yaml("config.yml")
container.config.github.auth_token.from_env("GITHUB_TOKEN")
app = Flask(__name__)
@ -684,7 +671,7 @@ Edit ``containers.py``:
class Container(containers.DeclarativeContainer):
config = providers.Configuration()
config = providers.Configuration(yaml_files=["config.yml"])
github_client = providers.Factory(
Github,
@ -732,38 +719,39 @@ Edit ``views.py``:
repositories=repositories,
)
To make the injection work we need to wire the container instance with the ``views`` module.
This needs to be done once. After it's done we can use ``Provide`` markers to specify as many
injections as needed for any view.
To make the injection work we need to wire the container with the ``views`` module.
Let's configure the container to automatically make wiring with the ``views`` module when we
create a container instance.
Edit ``application.py``:
Edit ``containers.py``:
.. code-block:: python
:emphasize-lines: 14
:emphasize-lines: 11
"""Application module."""
"""Containers module."""
from flask import Flask
from flask_bootstrap import Bootstrap
from dependency_injector import containers, providers
from github import Github
from .containers import Container
from . import views
from . import services
def create_app() -> Flask:
container = Container()
container.config.from_yaml("config.yml")
container.config.github.auth_token.from_env("GITHUB_TOKEN")
container.wire(modules=[views])
class Container(containers.DeclarativeContainer):
app = Flask(__name__)
app.container = container
app.add_url_rule("/", "index", views.index)
wiring_config = containers.WiringConfiguration(modules=[".views"])
bootstrap = Bootstrap()
bootstrap.init_app(app)
config = providers.Configuration(yaml_files=["config.yml"])
return app
github_client = providers.Factory(
Github,
login_or_token=config.github.auth_token,
timeout=config.github.request_timeout,
)
search_service = providers.Factory(
services.SearchService,
github_client=github_client,
)
Make sure the app is running or use ``flask run`` and open ``http://127.0.0.1:5000/``.
@ -960,23 +948,23 @@ You should see:
.. code-block:: bash
platform darwin -- Python 3.9, pytest-5.4.3, py-1.9.0, pluggy-0.13.1
plugins: flask-1.0.0, cov-2.10.0
platform darwin -- Python 3.10.0, pytest-6.2.5, py-1.10.0, pluggy-1.0.0
plugins: cov-3.0.0, flask-1.2.0
collected 2 items
githubnavigator/tests.py .. [100%]
---------- coverage: platform darwin, python 3.9 -----------
---------- coverage: platform darwin, python 3.10.0-final-0 ----------
Name Stmts Miss Cover
----------------------------------------------------
githubnavigator/__init__.py 0 0 100%
githubnavigator/application.py 15 0 100%
githubnavigator/containers.py 7 0 100%
githubnavigator/application.py 13 0 100%
githubnavigator/containers.py 8 0 100%
githubnavigator/services.py 14 0 100%
githubnavigator/tests.py 34 0 100%
githubnavigator/views.py 10 0 100%
----------------------------------------------------
TOTAL 80 0 100%
TOTAL 79 0 100%
.. note::

12
examples/miniapps/flask/README.rst
View File

@ -81,20 +81,20 @@ The output should be something like:
.. code-block::
platform darwin -- Python 3.9, pytest-5.4.3, py-1.9.0, pluggy-0.13.1
plugins: flask-1.0.0, cov-2.10.0
platform darwin -- Python 3.10.0, pytest-6.2.5, py-1.10.0, pluggy-1.0.0
plugins: cov-3.0.0, flask-1.2.0
collected 2 items
githubnavigator/tests.py .. [100%]
---------- coverage: platform darwin, python 3.9 -----------
---------- coverage: platform darwin, python 3.10.0-final-0 ----------
Name Stmts Miss Cover
----------------------------------------------------
githubnavigator/__init__.py 0 0 100%
githubnavigator/application.py 15 0 100%
githubnavigator/containers.py 7 0 100%
githubnavigator/application.py 13 0 100%
githubnavigator/containers.py 8 0 100%
githubnavigator/services.py 14 0 100%
githubnavigator/tests.py 34 0 100%
githubnavigator/views.py 10 0 100%
----------------------------------------------------
TOTAL 80 0 100%
TOTAL 79 0 100%

2
examples/miniapps/flask/githubnavigator/application.py
View File

@ -9,9 +9,7 @@ from . import views
def create_app() -> Flask:
container = Container()
container.config.from_yaml("config.yml")
container.config.github.auth_token.from_env("GITHUB_TOKEN")
container.wire(modules=[views])
app = Flask(__name__)
app.container = container

4
examples/miniapps/flask/githubnavigator/containers.py
View File

@ -8,7 +8,9 @@ from . import services
class Container(containers.DeclarativeContainer):
config = providers.Configuration()
wiring_config = containers.WiringConfiguration(modules=[".views"])
config = providers.Configuration(yaml_files=["config.yml"])
github_client = providers.Factory(
Github,