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107 lines
4 KiB
ReStructuredText
107 lines
4 KiB
ReStructuredText
sprockets.mixins.mediatype
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==========================
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A mixin that performs Content-Type negotiation and request/response
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(de)serialization.
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|Documentation| |Build Badge| |Package Info|
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This mix-in adds two methods to a ``tornado.web.RequestHandler`` instance:
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- ``get_request_body() -> dict``: deserializes the request body according
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to the HTTP ``Content-Type`` header and returns the deserialized body.
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- ``send_response(object)``: serializes the response into the content type
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requested by the ``Accept`` header.
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Before adding support for specific content types, you SHOULD install the
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content settings into your ``tornado.web.Application`` instance. If you
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don't install the content settings, then an instance will be created for
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you by the mix-in; however, the created instance will be empty. You
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should already have a function that creates the ``Application`` instance.
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If you don't, now is a good time to add one.
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.. code-block:: python
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from sprockets.mixins.mediatype import content
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from tornado import web
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def make_application():
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application = web.Application([
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# insert your handlers here
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])
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content.install(application, 'application/json', 'utf-8')
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return application
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Support for a content types is enabled by calling ``add_binary_content_type``,
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``add_text_content_type`` or the ``add_transcoder`` functions with the
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``tornado.web.Application`` instance, the content type, encoding and decoding
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functions as parameters:
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.. code-block:: python
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import json
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from sprockets.mixins.mediatype import content
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from tornado import web
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def make_application():
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application = web.Application([
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# insert your handlers here
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])
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content.install(application, 'application/json', 'utf-8')
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content.add_text_content_type(application,
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'application/json', 'utf-8',
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json.dumps, json.loads)
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return application
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The *add content type* functions will add a attribute to the ``Application``
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instance that the mix-in uses to manipulate the request and response bodies.
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The *add_transcoder* function is similar except that it takes an object
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that implements transcoding methods instead of simple functions. The
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``transcoders`` module includes ready-to-use transcoders for a few content
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types:
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.. code-block:: python
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from sprockets.mixins.mediatype import content, transcoders
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from tornado import web
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def make_application():
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application = web.Application([
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# insert your handlers here
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])
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content.install(application, 'application/json', 'utf-8')
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content.add_transcoder(application, transcoders.JSONTranscoder())
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return application
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In either case, the ``ContentMixin`` uses the registered content type
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information to provide transparent content type negotiation for your
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request handlers.
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.. code-block:: python
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from sprockets.mixins.mediatype import content
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from tornado import web
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class SomeHandler(content.ContentMixin, web.RequestHandler):
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def get(self):
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self.send_response({'data': 'value'})
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def post(self):
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body = self.get_request_body()
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# do whatever
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self.send_response({'action': 'performed'})
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Based on the settings stored in the ``Application`` instance and the HTTP
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headers, the request and response data will be handled correctly or the
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appropriate HTTP exceptions will be raised.
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.. |Documentation| image:: https://readthedocs.org/projects/sprocketsmixinsmedia-type/badge/?version=latest
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:target: https://sprocketsmixinsmedia-type.readthedocs.org/
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.. |Build Badge| image:: https://github.com/sprockets/sprockets.mixins.mediatype/actions/workflows/testing.yml/badge.svg
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:target: https://github.com/sprockets/sprockets.mixins.mediatype/actions/workflows/testing.yml
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.. |Package Info| image:: https://img.shields.io/pypi/v/sprockets.mixins.mediatype.svg
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:target: https://pypi.python.org/pypi/sprockets.mixins.mediatype
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