aiohttp-devtools

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Dev tools for aiohttp_.

(Note: aiohttp-devtools>=0.8 only supports aiohttp>=3.0, if you're using older aiohttp, please use an older version of aiohttp-devtools, see History.rst_ for details.)

aiohttp-devtools provides a number of tools useful when developing applications with aiohttp and associated libraries.

Installation

Requires python 3.5, python 3.6 or python 3.7.

.. code:: shell

pip install aiohttp-devtools

Usage

The aiohttp-devtools CLI (and it's shorter alias adev) consist of three sub-commands: runserver, serve and start_.

runserver

Provides a simple local server for running your application while you're developing.

Usage is simply

.. code:: shell

    adev runserver <app-path>

**Note:** ``adev runserver <app-path>`` will import the whole file, hence it doesn't work
with ``web.run_app(app)``. You can however use ``if __name__ == '__main__': web.run_app(app)``.

``app-path`` can be a path to either a directory containing a recognized default file (``app.py``
or ``main.py``) or to a specific file. The ``--app-factory`` option can be used to define which method is called
from the app path file, if not supplied some default method names are tried
(namely `app`, `app_factory`, `get_app` and `create_app`, which can be
attributes, functions, or coroutines).

All ``runserver`` arguments can be set via environment variables, the `start`_ command creates a script
suitable for setting up your environment such that you can run the dev server with just ``adev runserver``.

``runserver`` has a few of useful features:

* **livereload** will reload resources in the browser as your code changes without having to hit refresh, see `livereload`_ for more details.
* **static files** are served separately from your main app (generally on ``8001`` while your app is on ``8000``) so you don't have to contaminate your application to serve static files you only need locally

For more options see ``adev runserver --help``.

serve
~~~~~

Similar to `runserver`_ except just serves static files.

Usage is simply

.. code:: shell

    adev serve <path-to-directory-to-serve>

Like ``runserver`` you get nice live reloading and access logs. For more options see ``adev serve --help``.

start
~~~~~

Creates a new bare bones aiohttp app similar to django's "startproject".


Usage is simply

.. code:: shell

    adev start <path-to-directory-to-create-project-in>

This will generate an example **message board** app with some basic functionality: Messages can be added via posting to a form, they are stored in the database and then displayed in a list, and the session is used to pre-populate the user's name.

The app includes:

* Jinja2 template engine, via `aiohttp_jinja2`_
* encrypted cookie sessions using `aiohttp_session`_
* Postgres database, via `asyncpg`_

Tutorial
--------

To demonstrate what adev can do, let's walk through creating a new application:

First let's create a clean python environment to work in and install aiohttp-devtools.

(it is assumed you've already got **python 3.5**, **pip** and **virtualenv** installed)

.. code:: shell

    mkdir my_new_app && cd my_new_app
    virtualenv -p `which python3.7` env
    . env/bin/activate
    pip install aiohttp-devtools


We're now ready to build our new application with `start`_, using the current directory ``.`` will put files where
we want them and will prompt adev to name the project ``my_new_app`` after the current directory.

We're going to explicitly choose no database here to make, this tutorial easier but you can remove that option
and choose to use a proper database if you like.

You can just hit return to choose the default for all the options.


.. code:: shell

    adev start . --database none

That's it, your app is now created. You might want to have a look through the local directory's file tree.

Before you can run your app you'll need to install the other requirements, luckily they've already been listed in
``./requirements.txt`` by `start`_, to install simply run

.. code:: shell

    pip install -r requirements.txt

(If you went off-piste and choose to use a database you'll need to edit ``activate.settings.sh`` to configure
connection settings, then run ``make reset-database`` to create a database.)

You can then run your app with just:

.. code:: shell

    source activate.settings.sh
    adev runserver

`runserver`_ uses the environment variables set in ``activate.settings.sh`` to decide how to serve your app.

With that:

* your app should be being served at ``localhost:8000`` (you can go and play with it in a browser).
* Your static files are being served at ``localhost:8001``, adev has configured your app to know that so it should be rendering properly.
* any changes to your app's code (``.py`` files) should cause the server to reload, changes to any files
  (``.py`` as well as ``.jinja``, ``.js``, ``.css`` etc.) will cause livereload to prompt your browser to reload the required pages.

**That's it, go develop.**

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.. _History.rst: /HISTORY.rst
.. _livereload: https://github.com/livereload/livereload-js
.. _aiohttp: http://aiohttp.readthedocs.io/en/stable/
.. _aiohttp_jinja2: https://github.com/aio-libs/aiohttp_jinja2
.. _aiohttp_session: https://aiohttp-session.readthedocs.io/en/latest/
.. _asyncpg: https://magicstack.github.io/asyncpg/current/