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"""
The main DebugToolbar class that loads and renders the Toolbar.
"""
from __future__ import unicode_literals
from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
from django.template.loader import render_to_string
from django.utils.datastructures import SortedDict
from django.utils.importlib import import_module
from debug_toolbar.utils import settings as dt_settings
class DebugToolbar(object):
def __init__(self, request):
self.request = request
self._panels = SortedDict()
base_url = self.request.META.get('SCRIPT_NAME', '')
self.config = {}
self.config.update(dt_settings.CONFIG)
self.template_context = {
'BASE_URL': base_url, # for backwards compatibility
'STATIC_URL': settings.STATIC_URL,
'TOOLBAR_ROOT_TAG_ATTRS': self.config['ROOT_TAG_ATTRS'],
}
self.load_panels()
self.stats = {}
def _get_panels(self):
return list(self._panels.values())
panels = property(_get_panels)
def get_panel(self, cls):
return self._panels[cls]
def load_panels(self):
"""
Populate debug panels
"""
for panel_class in self.get_panel_classes():
panel_instance = panel_class(self, context=self.template_context)
self._panels[panel_class] = panel_instance
def render_toolbar(self):
"""
Renders the overall Toolbar with panels inside.
"""
context = self.template_context.copy()
context.update({
'panels': self.panels,
'storage_id': self.store(),
})
return render_to_string('debug_toolbar/base.html', context)
# Handle storing toolbars in memory and fetching them later on
_counter = 0
_storage = SortedDict()
def store(self):
cls = type(self)
cls._counter += 1
cls._storage[cls._counter] = self
for _ in range(len(cls._storage) - dt_settings.CONFIG['RESULTS_CACHE_SIZE']):
# When we drop support for Python 2.6 and switch to
# collections.OrderedDict, use popitem(last=False).
del cls._storage[cls._storage.keyOrder[0]]
return cls._counter
@classmethod
def fetch(cls, storage_id):
return cls._storage.get(storage_id)
# Manually implement class-level caching of the list of panels because
# it's more obvious than going through an abstraction.
_panel_classes = None
@classmethod
def get_panel_classes(cls):
if cls._panel_classes is None:
# Load panels in a temporary variable for thread safety.
panel_classes = []
for panel_path in dt_settings.PANELS:
# This logic could be replaced with import_by_path in Django 1.6.
try:
panel_module, panel_classname = panel_path.rsplit('.', 1)
except ValueError:
raise ImproperlyConfigured(
"%s isn't a debug panel module" % panel_path)
try:
mod = import_module(panel_module)
except ImportError as e:
raise ImproperlyConfigured(
'Error importing debug panel %s: "%s"' %
(panel_module, e))
try:
panel_class = getattr(mod, panel_classname)
except AttributeError:
raise ImproperlyConfigured(
'Toolbar Panel module "%s" does not define a "%s" class' %
(panel_module, panel_classname))
panel_classes.append(panel_class)
cls._panel_classes = panel_classes
return cls._panel_classes
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