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import time
import inspect
from django.core import cache
from django.core.cache.backends.base import BaseCache
from django.utils.translation import ugettext_lazy as _, ungettext
from debug_toolbar.panels import DebugPanel
class CacheStatTracker(BaseCache):
"""A small class used to track cache calls."""
def __init__(self, cache):
self.cache = cache
self.reset()
def reset(self):
self.calls = []
self.hits = 0
self.misses = 0
self.sets = 0
self.gets = 0
self.get_many = 0
self.deletes = 0
self.total_time = 0
def _get_func_info(self):
stack = inspect.stack()[2]
return (stack[1], stack[2], stack[3], stack[4])
def get(self, key, **kwargs):
t = time.time()
value = self.cache.get(key, **kwargs)
this_time = time.time() - t
self.total_time += this_time * 1000
if value is None:
self.misses += 1
else:
self.hits += 1
self.gets += 1
self.calls.append((this_time, 'get', (key,), self._get_func_info()))
return value
def set(self, key, value, timeout=None, **kwargs):
t = time.time()
self.cache.set(key, value, timeout, **kwargs)
this_time = time.time() - t
self.total_time += this_time * 1000
self.sets += 1
self.calls.append((this_time, 'set', (key, value, timeout), self._get_func_info()))
def delete(self, key, **kwargs):
t = time.time()
self.cache.delete(key, **kwargs)
this_time = time.time() - t
self.total_time += this_time * 1000
self.deletes += 1
self.calls.append((this_time, 'delete', (key,), self._get_func_info()))
def get_many(self, keys, **kwargs):
t = time.time()
results = self.cache.get_many(keys)
this_time = time.time() - t
self.total_time += this_time * 1000
self.get_many += 1
for key, value in results.iteritems():
if value is None:
self.misses += 1
else:
self.hits += 1
self.calls.append((this_time, 'get_many', (keys,), self._get_func_info()))
class CacheDebugPanel(DebugPanel):
"""
Panel that displays the cache statistics.
"""
name = 'Cache'
template = 'debug_toolbar/panels/cache.html'
has_content = True
def __init__(self, *args, **kwargs):
super(CacheDebugPanel, self).__init__(*args, **kwargs)
# This is hackish but to prevent threading issues is somewhat needed
if isinstance(cache.cache, CacheStatTracker):
cache.cache.reset()
self.cache = cache.cache
else:
self.cache = CacheStatTracker(cache.cache)
cache.cache = self.cache
def nav_title(self):
return _('Cache')
def nav_subtitle(self):
cache_calls = len(self.cache.calls)
return ungettext('%(cache_calls)d call in %(time).2fms',
'%(cache_calls)d calls in %(time).2fms',
cache_calls) % {'cache_calls': cache_calls,
'time': self.cache.total_time}
def title(self):
return _('Cache Usage')
def url(self):
return ''
def process_response(self, request, response):
self.record_stats({
'cache_calls': len(self.cache.calls),
'cache_time': self.cache.total_time,
'cache': self.cache,
})
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