ASGI-Babel

asgi-babel -- Adds internationalization (i18n) support to ASGI applications (Asyncio / Trio / Curio)

Requirements

• python >= 3.8

Installation

asgi-babel should be installed using pip: :

pip install asgi-babel

Usage

Common ASGI applications:

from asgi_babel import BabelMiddleware, current_locale, gettext

async def my_app(scope, receive, send):
    """Get a current locale."""
    locale = current_locale.get().language.encode()
    hello_world = gettext('Hello World!').encode()

    await send({"type": "http.response.start", "status": 200})
    await send({"type": "http.response.body", "body": b"Current locale is %s\n" % locale})
    await send({"type": "http.response.body", "body": hello_world})

app = BabelMiddleware(my_app, locales_dirs=['tests/locales'])

# http GET /
#
# Current_locale is en
# Hello World!

# http GET / "accept-language: ft-CH, fr;q-0.9"
#
# Current_locale is fr
# Bonjour le monde!

As ASGI-Tools Internal middleware

from asgi_tools import App
from asgi_babel import BabelMiddleware, gettext

app = App()
app.middleware(BabelMiddleware.setup(locales_dirs=['tests/locales']))

@app.route('/')
async def index(request):
    return gettext('Hello World!')

@app.route('/locale')
async def locale(request):
    return current_locale.get().language

Usage with Curio async library

The asgi-babel uses context variable to set current locale. To enable the context variables with curio you have to run Curio with contextvars support:

from curio.task import ContextTask

curio.run(main, taskcls=ContextTask)

Options

The middleware's options with default values:

from asgi_babel import BabelMiddleware

app = BabelMiddleware(

     # Your ASGI application
     app,

     # Default locale
     default_locale='en',

     # A path to find translations
     locales_dirs=['locales']

     # A function with type: typing.Callable[[asgi_tools.Request], t.Awaitable[t.Optional[str]]]
     # which takes a request and default locale and return current locale
     locale_selector=asgi_babel.select_locale_by_request,

)

How to extract & compile locales:

http://babel.pocoo.org/en/latest/messages.html

http://babel.pocoo.org/en/latest/cmdline.html

Bug tracker

If you have any suggestions, bug reports or annoyances please report them to the issue tracker at https://github.com/klen/asgi-babel/issues

Contributing

Development of the project happens at: https://github.com/klen/asgi-babel

License

Licensed under a MIT license.