When I am trying to run Django with the latest version of the Redis module, it crashes:
Invalid input of type: 'CacheKey'. Convert to a byte, string or number first.
It's this message. Full stack trace:
Environment:
Request Method: GET
Request URL: http://localhost:8000/
Django Version: 2.1.3
Python Version: 3.6.3
Installed Applications:
('django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'django.contrib.humanize',
'django.contrib.postgres',
'django.contrib.sites',
'django.contrib.flatpages',
'django.contrib.sitemaps',
'django.contrib.admin',
'django.contrib.admindocs',
'rest_framework',
'rest_framework_docs',
'rest_framework.authtoken',
'drf_yasg',
'django_bleach',
'cspreports',
'captcha',
'django_markdown2',
'crispy_forms',
'api2',
'headers',
'worker',
'cookies',
'sslyze.apps.CoreConfig',
'flash',
'rss',
'seo',
'news',
'contact',
'browser_extension',
'adstxt',
'vuln',
'busint',
'csp_analytics',
'reporting_api',
'register_site.apps.CoreConfig',
'utils',
'stats',
'phantomjs',
'malware',
'paypal.standard.ipn',
'payments.apps.PaymentsConfig')
Installed Middleware:
['django.middleware.cache.UpdateCacheMiddleware',
'django.middleware.gzip.GZipMiddleware',
'django.middleware.http.ConditionalGetMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.locale.LocaleMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'django.middleware.security.SecurityMiddleware',
'middleware.dnt.DoNotTrackMiddleware',
'middleware.preload.ResourceHintsMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.cache.FetchFromCacheMiddleware']
Traceback:
File "/home/sumit/wps2/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
34. response = get_response(request)
File "/home/sumit/wps2/lib/python3.6/site-packages/django/utils/deprecation.py" in __call__
90. response = self.process_request(request)
File "/home/sumit/wps2/lib/python3.6/site-packages/django/middleware/cache.py" in process_request
137. cache_key = get_cache_key(request, self.key_prefix, 'GET', cache=self.cache)
File "/home/sumit/wps2/lib/python3.6/site-packages/django/utils/cache.py" in get_cache_key
335. headerlist = cache.get(cache_key)
File "/home/sumit/wps2/lib/python3.6/site-packages/django_redis/cache.py" in _decorator
32. return method(self, *args, **kwargs)
File "/home/sumit/wps2/lib/python3.6/site-packages/django_redis/cache.py" in get
81. client=client)
File "/home/sumit/wps2/lib/python3.6/site-packages/django_redis/client/default.py" in get
202. value = client.get(key)
File "/home/sumit/wps2/lib/python3.6/site-packages/redis/client.py" in get
1207. return self.execute_command('GET', name)
File "/home/sumit/wps2/lib/python3.6/site-packages/redis/client.py" in execute_command
754. connection.send_command(*args)
File "/home/sumit/wps2/lib/python3.6/site-packages/redis/connection.py" in send_command
619. self.send_packed_command(self.pack_command(*args))
File "/home/sumit/wps2/lib/python3.6/site-packages/redis/connection.py" in pack_command
659. for arg in imap(self.encoder.encode, args):
File "/home/sumit/wps2/lib/python3.6/site-packages/redis/connection.py" in encode
124. "byte, string or number first." % typename)
Exception Type: DataError at /
Exception Value: Invalid input of type: 'CacheKey'. Convert to a byte, string or number first.
Solution:
This issue needs to be fixed in django-redis. I think this is not-a-bug as far as redis-py is concerned.
redis-py 3.0 only accepts keys and values as bytes, strings or numbers. This is a backwards incompatible change listed in the release notes.
I suspect django-redis needs to be updated to convert the CacheKey type into a string before sending it into redis-py.
django-redis isn't constraining it's dependency on py-redis to version 2.
install_requires=[
"Django>=1.11",
"redis>=2.10.0",
],
I imagine a lot of people are going to get stung by this so expect django-redis to get fixed soon.
If you can't wait for the fix, you could pin the last v2 of py-redis in your requirements.txt file
redis==2.10.6
