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# coding: utf-8 |
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from __future__ import unicode_literals |
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from collections import defaultdict |
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from datetime import datetime |
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from debug_toolbar.panels import Panel |
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from django.apps import apps |
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from django.conf import settings |
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from django.core.cache import cache |
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from django.utils.translation import ugettext_lazy as _ |
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from django.utils.timesince import timesince |
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from .utils import _get_table_cache_key |
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class CachalotPanel(Panel): |
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title = 'Cachalot' |
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template = 'cachalot/panel.html' |
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def __init__(self, *args, **kwargs): |
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self.last_invalidation = None |
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super(CachalotPanel, self).__init__(*args, **kwargs) |
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@property |
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def enabled(self): |
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enabled = super(CachalotPanel, self).enabled |
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if enabled: |
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self.enable_instrumentation() |
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else: |
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self.disable_instrumentation() |
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return enabled |
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def enable_instrumentation(self): |
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settings.CACHALOT_ENABLED = True |
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def disable_instrumentation(self): |
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settings.CACHALOT_ENABLED = False |
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def process_response(self, request, response): |
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self.collect_invalidations() |
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def collect_invalidations(self): |
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models = apps.get_models() |
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data = defaultdict(list) |
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for db_alias in settings.DATABASES: |
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model_cache_keys = dict( |
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[(_get_table_cache_key(db_alias, model._meta.db_table), model) |
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for model in models]) |
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for cache_key, timestamp in cache.get_many( |
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model_cache_keys.keys()).items(): |
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invalidation = datetime.fromtimestamp(timestamp) |
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model = model_cache_keys[cache_key] |
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data[db_alias].append( |
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(model._meta.app_label, model.__name__, invalidation)) |
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if self.last_invalidation is None \ |
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or invalidation > self.last_invalidation: |
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self.last_invalidation = invalidation |
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data[db_alias].sort(key=lambda row: row[2], reverse=True) |
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self.record_stats({'invalidations_per_db': data.items()}) |
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@property |
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def nav_subtitle(self): |
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if self.enabled and self.last_invalidation is not None: |
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return (_('Last invalidation: %s') |
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% timesince(self.last_invalidation)) |
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return '' |
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noripyt /
django-cachalot
