13682e4694
When capa problem rendering was moved to happen inline on courseware page loads, we started executing many more Mako templates on sequences with large numbers of thse problems. To help offset this, we're caching the context generation (it showed up as the easiest piece of low hanging fruit on profiles of the courseware index page). [PERF-261]
76 lines
2.6 KiB
Python
76 lines
2.6 KiB
Python
# Copyright (c) 2008 Mikeal Rogers
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import threading
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from django.conf import settings
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from django.template import RequestContext
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from django.template.context import _builtin_context_processors
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from django.utils.module_loading import import_string
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from util.request import safe_get_host
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from request_cache.middleware import RequestCache
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REQUEST_CONTEXT = threading.local()
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class MakoMiddleware(object):
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def process_request(self, request):
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""" Process the middleware request. """
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REQUEST_CONTEXT.request = request
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def process_response(self, __, response):
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""" Process the middleware response. """
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REQUEST_CONTEXT.request = None
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return response
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def get_template_context_processors():
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"""
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Returns the context processors defined in settings.TEMPLATES.
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"""
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context_processors = _builtin_context_processors
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context_processors += tuple(settings.DEFAULT_TEMPLATE_ENGINE['OPTIONS']['context_processors'])
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return tuple(import_string(path) for path in context_processors)
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def get_template_request_context():
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"""
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Returns the template processing context to use for the current request,
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or returns None if there is not a current request.
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"""
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request = getattr(REQUEST_CONTEXT, "request", None)
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if not request:
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return None
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request_cache_dict = RequestCache.get_request_cache().data
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cache_key = "edxmako_request_context"
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if cache_key in request_cache_dict:
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return request_cache_dict[cache_key]
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context = RequestContext(request)
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context['is_secure'] = request.is_secure()
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context['site'] = safe_get_host(request)
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# This used to happen when a RequestContext object was initialized but was
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# moved to a different part of the logic when template engines were introduced.
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# Since we are not using template engines we do this here.
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# https://github.com/django/django/commit/37505b6397058bcc3460f23d48a7de9641cd6ef0
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for processor in get_template_context_processors():
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context.update(processor(request))
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request_cache_dict[cache_key] = context
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return context
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