145 lines
5.3 KiB
Python
145 lines
5.3 KiB
Python
from django.http import HttpResponse
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from .loader import get_template, select_template
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class ContentNotRenderedError(Exception):
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pass
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class SimpleTemplateResponse(HttpResponse):
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rendering_attrs = ['template_name', 'context_data', '_post_render_callbacks']
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def __init__(self, template, context=None, content_type=None, status=None,
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charset=None, using=None):
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# It would seem obvious to call these next two members 'template' and
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# 'context', but those names are reserved as part of the test Client
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# API. To avoid the name collision, we use different names.
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self.template_name = template
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self.context_data = context
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self.using = using
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self._post_render_callbacks = []
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# _request stores the current request object in subclasses that know
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# about requests, like TemplateResponse. It's defined in the base class
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# to minimize code duplication.
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# It's called self._request because self.request gets overwritten by
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# django.test.client.Client. Unlike template_name and context_data,
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# _request should not be considered part of the public API.
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self._request = None
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# content argument doesn't make sense here because it will be replaced
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# with rendered template so we always pass empty string in order to
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# prevent errors and provide shorter signature.
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super().__init__('', content_type, status, charset=charset)
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# _is_rendered tracks whether the template and context has been baked
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# into a final response.
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# Super __init__ doesn't know any better than to set self.content to
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# the empty string we just gave it, which wrongly sets _is_rendered
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# True, so we initialize it to False after the call to super __init__.
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self._is_rendered = False
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def __getstate__(self):
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"""
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Raise an exception if trying to pickle an unrendered response. Pickle
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only rendered data, not the data used to construct the response.
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"""
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obj_dict = self.__dict__.copy()
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if not self._is_rendered:
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raise ContentNotRenderedError('The response content must be '
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'rendered before it can be pickled.')
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for attr in self.rendering_attrs:
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if attr in obj_dict:
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del obj_dict[attr]
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return obj_dict
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def resolve_template(self, template):
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"""Accept a template object, path-to-template, or list of paths."""
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if isinstance(template, (list, tuple)):
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return select_template(template, using=self.using)
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elif isinstance(template, str):
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return get_template(template, using=self.using)
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else:
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return template
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def resolve_context(self, context):
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return context
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@property
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def rendered_content(self):
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"""Return the freshly rendered content for the template and context
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described by the TemplateResponse.
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This *does not* set the final content of the response. To set the
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response content, you must either call render(), or set the
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content explicitly using the value of this property.
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"""
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template = self.resolve_template(self.template_name)
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context = self.resolve_context(self.context_data)
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return template.render(context, self._request)
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def add_post_render_callback(self, callback):
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"""Add a new post-rendering callback.
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If the response has already been rendered,
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invoke the callback immediately.
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"""
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if self._is_rendered:
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callback(self)
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else:
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self._post_render_callbacks.append(callback)
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def render(self):
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"""Render (thereby finalizing) the content of the response.
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If the content has already been rendered, this is a no-op.
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Return the baked response instance.
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"""
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retval = self
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if not self._is_rendered:
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self.content = self.rendered_content
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for post_callback in self._post_render_callbacks:
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newretval = post_callback(retval)
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if newretval is not None:
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retval = newretval
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return retval
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@property
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def is_rendered(self):
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return self._is_rendered
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def __iter__(self):
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if not self._is_rendered:
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raise ContentNotRenderedError(
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'The response content must be rendered before it can be iterated over.'
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)
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return super().__iter__()
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@property
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def content(self):
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if not self._is_rendered:
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raise ContentNotRenderedError(
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'The response content must be rendered before it can be accessed.'
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)
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return super().content
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@content.setter
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def content(self, value):
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"""Set the content for the response."""
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HttpResponse.content.fset(self, value)
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self._is_rendered = True
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class TemplateResponse(SimpleTemplateResponse):
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rendering_attrs = SimpleTemplateResponse.rendering_attrs + ['_request']
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def __init__(self, request, template, context=None, content_type=None,
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status=None, charset=None, using=None):
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super().__init__(template, context, content_type, status, charset, using)
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self._request = request
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