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from __future__ import absolute_import, unicode_literals
from os.path import normpath
from pprint import pformat
import django
from django import http
from django.conf import settings
from django.conf.urls import patterns, url
from django.db.models.query import QuerySet, RawQuerySet
from django.template.context import get_standard_processors
from django.test.signals import template_rendered
from django.utils.encoding import force_text
from django.utils import six
from django.utils.translation import ugettext_lazy as _
from debug_toolbar.panels import Panel
from debug_toolbar.panels.sql.tracking import recording, SQLQueryTriggered
# Code taken and adapted from Simon Willison and Django Snippets:
# http://www.djangosnippets.org/snippets/766/
# Monkey-patch to enable the template_rendered signal. The receiver returns
# immediately when the panel is disabled to keep the overhead small.
from django.test.utils import instrumented_test_render
from django.template import Template
if Template._render != instrumented_test_render:
Template.original_render = Template._render
Template._render = instrumented_test_render
if django.VERSION[:2] < (1, 7):
# Monkey-patch versions of Django where Template doesn't store origin.
# See https://code.djangoproject.com/ticket/16096.
old_template_init = Template.__init__
def new_template_init(self, template_string, origin=None, name='<Unknown Template>'):
old_template_init(self, template_string, origin, name)
self.origin = origin
Template.__init__ = new_template_init
class TemplatesPanel(Panel):
"""
A panel that lists all templates used during processing of a response.
"""
def __init__(self, *args, **kwargs):
super(TemplatesPanel, self).__init__(*args, **kwargs)
self.templates = []
template_rendered.connect(self._store_template_info)
def _store_template_info(self, sender, **kwargs):
if not self.enabled:
return
template, context = kwargs['template'], kwargs['context']
# Skip templates that we are generating through the debug toolbar.
if (isinstance(template.name, six.string_types) and
template.name.startswith('debug_toolbar/')):
return
context_list = []
for context_layer in context.dicts:
temp_layer = {}
if hasattr(context_layer, 'items'):
for key, value in context_layer.items():
# Replace any request elements - they have a large
# unicode representation and the request data is
# already made available from the Request panel.
if isinstance(value, http.HttpRequest):
temp_layer[key] = '<<request>>'
# Replace the debugging sql_queries element. The SQL
# data is already made available from the SQL panel.
elif key == 'sql_queries' and isinstance(value, list):
temp_layer[key] = '<<sql_queries>>'
# Replace LANGUAGES, which is available in i18n context processor
elif key == 'LANGUAGES' and isinstance(value, tuple):
temp_layer[key] = '<<languages>>'
# QuerySet would trigger the database: user can run the query from SQL Panel
elif isinstance(value, (QuerySet, RawQuerySet)):
model_name = "%s.%s" % (
value.model._meta.app_label, value.model.__name__)
temp_layer[key] = '<<%s of %s>>' % (
value.__class__.__name__.lower(), model_name)
else:
try:
recording(False)
pformat(value) # this MAY trigger a db query
except SQLQueryTriggered:
temp_layer[key] = '<<triggers database query>>'
except UnicodeEncodeError:
temp_layer[key] = '<<unicode encode error>>'
except Exception:
temp_layer[key] = '<<unhandled exception>>'
else:
temp_layer[key] = value
finally:
recording(True)
try:
context_list.append(pformat(temp_layer))
except UnicodeEncodeError:
pass
kwargs['context'] = [force_text(item) for item in context_list]
self.templates.append(kwargs)
# Implement the Panel API
nav_title = _('Templates')
@property
def title(self):
num_templates = len(self.templates)
return _('Templates (%(num_templates)s rendered)') % {'num_templates': num_templates}
template = 'debug_toolbar/panels/templates.html'
@classmethod
def get_urls(cls):
return patterns('debug_toolbar.panels.templates.views', # noqa
url(r'^template_source/$', 'template_source', name='template_source'),
)
def process_response(self, request, response):
context_processors = dict(
[
("%s.%s" % (k.__module__, k.__name__),
pformat(k(request))) for k in get_standard_processors()
]
)
template_context = []
for template_data in self.templates:
info = {}
# Clean up some info about templates
template = template_data.get('template', None)
if not hasattr(template, 'origin'):
continue
if template.origin and template.origin.name:
template.origin_name = template.origin.name
else:
template.origin_name = 'No origin'
info['template'] = template
# Clean up context for better readability
if self.toolbar.config['SHOW_TEMPLATE_CONTEXT']:
context_list = template_data.get('context', [])
info['context'] = '\n'.join(context_list)
template_context.append(info)
self.record_stats({
'templates': template_context,
'template_dirs': [normpath(x) for x in settings.TEMPLATE_DIRS],
'context_processors': context_processors,
})
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