![Paul Karikh](/assets/img/avatar_default.png)
Since Horizon is going to be the first (or, one of the first) OpenStack component using the new MongoDB driver, it won't be able to retrieve traces made by other components using MongoDB driver (which it should use because Ceilometer driver was too slow) for a while. This means that Horizon itself is responsible for tracing the rendering of its pages down to the layer where the flow of control leaves Horizon domain. So, a lot of api wrappers in openstack_dashboard.api are augmented with tracing decorator to achieve this goal. Co-Authored-By: Timur Sufiev <tsufiev@mirantis.com> Implements-blueprint: openstack-profiler-at-developer-dashboard Change-Id: Ib36692f0e9e68ed7fa0cd47919ba6581c9c8ab57
120 lines
4.3 KiB
Python
120 lines
4.3 KiB
Python
# Copyright 2012 Nebula, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from django.conf import settings
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from django import shortcuts
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from django import template
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from django.utils import encoding
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from django.views import generic
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import horizon
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from horizon import exceptions
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from osprofiler import profiler
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class PageTitleMixin(object):
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"""A mixin that renders out a page title into a view.
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Many views in horizon have a page title that would ordinarily be
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defined and passed through in get_context_data function, this often
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leads to a lot of duplicated work in each view.
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This mixin standardises the process of defining a page title, letting
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views simply define a variable that is rendered into the context for
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them.
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There are cases when page title in a view may also display some context
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data, for that purpose the page_title variable supports the django
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templating language and will be rendered using the context defined by the
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views get_context_data.
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"""
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page_title = ""
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def render_context_with_title(self, context):
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"""This function takes in a context dict and uses it to render the
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page_title variable, it then appends this title to the context using
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the 'page_title' key. If there is already a page_title key defined in
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context received then this function will do nothing.
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"""
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if "page_title" not in context:
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con = template.Context(context)
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# NOTE(sambetts): Use force_text to ensure lazy translations
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# are handled correctly.
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temp = template.Template(encoding.force_text(self.page_title))
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context["page_title"] = temp.render(con)
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return context
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def render_to_response(self, context):
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"""This is an override of the default render_to_response function that
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exists in the django generic views, this is here to inject the
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page title into the context before the main template is rendered.
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"""
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context = self.render_context_with_title(context)
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return super(PageTitleMixin, self).render_to_response(context)
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def trace(name):
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def decorator(func):
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if getattr(settings, 'OPENSTACK_PROFILER', {}).get('enabled', False):
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return profiler.trace(name, info=None, hide_args=False,
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allow_multiple_trace=True)(func)
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else:
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return func
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return decorator
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class HorizonTemplateView(PageTitleMixin, generic.TemplateView):
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@trace('horizon.render_to_response')
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def render_to_response(self, context):
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return super(HorizonTemplateView, self).render_to_response(context)
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class HorizonFormView(PageTitleMixin, generic.FormView):
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pass
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def user_home(request):
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"""Reversible named view to direct a user to the appropriate homepage."""
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return shortcuts.redirect(horizon.get_user_home(request.user))
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class APIView(HorizonTemplateView):
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"""A quick class-based view for putting API data into a template.
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Subclasses must define one method, ``get_data``, and a template name
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via the ``template_name`` attribute on the class.
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Errors within the ``get_data`` function are automatically caught by
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the :func:`horizon.exceptions.handle` error handler if not otherwise
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caught.
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"""
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def get_data(self, request, context, *args, **kwargs):
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"""This method should handle any necessary API calls, update the
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context object, and return the context object at the end.
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"""
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return context
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def get(self, request, *args, **kwargs):
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context = self.get_context_data(**kwargs)
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try:
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context = self.get_data(request, context, *args, **kwargs)
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except Exception:
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exceptions.handle(request)
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return self.render_to_response(context)
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