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Project Description

Adds Injector support to Flask, this way there’s no need to use global Flask objects, which makes testing simpler.

Injector is a dependency-injection framework for Python, inspired by Guice.

\(Flask-Injector\) is compatible with CPython 3.3+. As of version 0.8.0 it requires Injector version 0.10.0 or greater and Flask 0.11.0 or greater.

GitHub project page: https://github.com/alecthomas/flask_injector

PyPI package page: https://pypi.python.org/pypi/Flask-Injector

Changelog: https://github.com/alecthomas/flask_injector/blob/master/CHANGELOG.rst

Features

Flask-Injector lets you inject dependencies into:

  • views (functions and class-based)
  • \(before_request\) handlers
  • \(after_request\) handlers
  • \(teardown_request\) handlers
  • template context processors
  • error handlers
  • Jinja environment globals (functions in \(app.jinja_env.globals\))
  • Flask-RESTFul Resource constructors
  • Flask-RestPlus Resource constructors

Flask-Injector supports defining types using function annotations (Python 3), see below.

Example application using Flask-Injector

import sqlite3
from flask import Flask, Config
from flask.views import View
from flask_injector import FlaskInjector
from injector import inject

app = Flask(__name__)

# Configure your application by attaching views, handlers, context processors etc.:

@app.route("/bar")
def bar():
    return render("bar.html")


# Route with injection
@app.route("/foo")
@inject(db=sqlite3.Connection)
def foo(db):
    users = db.execute('SELECT * FROM users').all()
    return render("foo.html")


# Class-based view with injected constructor
class Waz(View):
    @inject(db=sqlite3.Connection)
    def __init__(self, db):
        self.db = db

    def dispatch_request(self, key):
        users = self.db.execute('SELECT * FROM users WHERE name=?', (key,)).all()
        return 'waz'

app.add_url_rule('/waz/<key>', view_func=Waz.as_view('waz'))


# In the Injector world, all dependency configuration and initialization is
# performed in modules (http://packages.python.org/injector/#module). The
# same is true with Flask-Injector. You can see some examples of configuring
# Flask extensions through modules below.

# Accordingly, the next step is to create modules for any objects we want made
# available to the application. Note that in this example we also use the
# Injector to gain access to the `flask.Config`:

def configure(binder):
    binder.bind(
        sqlite3.Connection,
        to=sqlite3.Connection(':memory:'),
        scope=request,
    )

# Initialize Flask-Injector. This needs to be run *after* you attached all
# views, handlers, context processors and template globals.

FlaskInjector(app=app, modules=[configure])

# All that remains is to run the application

app.run()

See \(example.py\) for a more complete example, including \(Flask-SQLAlchemy\) and \(Flask-Cache\) integration.

Supporting Flask Extensions

Typically, Flask extensions are initialized at the global scope using a pattern similar to the following.

app = Flask(__name__)
ext = ExtClass(app)

@app.route(...)
def view():
    # Use ext object here...

As we don’t have these globals with Flask-Injector we have to configure the extension the Injector way - through modules. Modules can either be subclasses of \(injector.Module\) or a callable taking an \(injector.Binder\) instance.

@inject(app=Flask)
def configure_ext(binder, app):
    binder.bind(ExtClass, to=ExtClass(app), scope=singleton)

def main():
    app = Flask(__name__)
    app.config.update(
        EXT_CONFIG_VAR='some_value',
    )

    # attach your views etc. here

    FlaskInjector(app=app, modules=[configure_ext])

    app.run()

Make sure to bind extension objects as singletons.

Using Python 3+ function annotations

If you want to use function annotations you can either pass use_annotations=True in the FlaskInjector constructor or provide an already configured Injector instance with use_annotations enabled, for example:

from flask import Flask
from flask_injector import FlaskInjector

app = Flask(__name__)

@app.route("/")
def index(s: str):
    return s

def configure(binder):
    binder.bind(str, to='this is a test')

FlaskInjector(app=app, modules=[configure], use_annotations=True)

# Alternatively:
from injector import Injector
injector = Injector(..., use_annotations=True)
FlaskInjector(app=app, injector=injector)
Release History

Release History

0.9.0

This version

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0.8.0

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0.7.1

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0.7.0

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0.6.2

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0.6.1

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0.6.0

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0.5.0

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0.4.0

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0.3.4

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0.3.3

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0.3.2

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0.3.1

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0.3.0

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0.3.0c2

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0.2.1

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0.2.0

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0.1.0

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Download Files

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
Flask_Injector-0.9.0-py2.py3-none-any.whl (10.9 kB) Copy SHA256 Checksum SHA256 3.6 Wheel Feb 9, 2017
Flask-Injector-0.9.0.tar.gz (8.1 kB) Copy SHA256 Checksum SHA256 Source Feb 9, 2017

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