aiohttp_jinja2

This is a fork of aio-libs/aiohttp-jinja2 Pull Request 154 which adds support for calling asyncio coroutines from jinja scripts.

This feature is disabled by default, to enable it you must set enable_async=True when calling the setup function. This will set enable_async in the jinja2 Environment.

jinja2 template renderer for aiohttp.web.

Installation

Install from PyPI:

pip install aiohttp-jinja2

Developing

Install requirement and launch tests:

pip install -r requirements-dev.txt
py.test tests

Usage

Before template rendering you have to setup jinja2 environment first:

app = web.Application()
aiohttp_jinja2.setup(app,
    loader=jinja2.FileSystemLoader('/path/to/templates/folder'))

Import:

import aiohttp_jinja2
import jinja2

Async rendering feature is enabled by default. You might want to disable that providing enable_async=False keyword argument to setup method. There is no difference in usage between two of them. In async mode enabled if you try to invoke sync Jinja2 methods (e.g. render) it will internally invoke corresponding sync method (e.g. render_async) and run it as part of the current event loop until the execution finished.

After that you may want to use template engine in your web-handlers. The most convenient way is to decorate a web-handler.

Using the function based web handlers:

@aiohttp_jinja2.template('tmpl.jinja2')
def handler(request):
    return {'name': 'Andrew', 'surname': 'Svetlov'}

Or for Class Based Views <https://aiohttp.readthedocs.io/en/stable/web_quickstart.html#class-based-views>:

class Handler(web.View):
    @aiohttp_jinja2.template('tmpl.jinja2')
    async def get(self):
        return {'name': 'Andrew', 'surname': 'Svetlov'}

On handler call the aiohttp_jinja2.template decorator will pass returned dictionary {'name': 'Andrew', 'surname': 'Svetlov'} into template named tmpl.jinja2 for getting resulting HTML text.

If you need more complex processing (set response headers for example) you may call render_template function.

Using a function based web handler:

async def handler(request):
    context = {'name': 'Andrew', 'surname': 'Svetlov'}
    response = aiohttp_jinja2.render_template('tmpl.jinja2',
                                              request,
                                              context)
    response.headers['Content-Language'] = 'ru'
    return response

Or, again, a class based view:

class Handler(web.View):
    async def get(self):
        context = {'name': 'Andrew', 'surname': 'Svetlov'}
        response = aiohttp_jinja2.render_template('tmpl.jinja2',
                                                  self.request,
                                                  context)
        response.headers['Content-Language'] = 'ru'
        return response

License

aiohttp_jinja2 is offered under the Apache 2 license.