Rack::Cache cache error: Unknown storage provider

[disbelief]

Hi there,

I recently attempted to start using redis-store as a back end for the Rack::Cache HTTP caching of my Rails 3.2 app. However I'm seeing the following stacktrace after following the README instructions:

cache error: Unknown storage provider: redis://REDACTED_REDIS_HOST:6379/1/metastore
ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/storage.rb:39:in `create_store'
ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/storage.rb:18:in `resolve_metastore_uri'
ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:34:in `metastore'
ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:169:in `lookup'
ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:66:in `call!'
ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:51:in `call'
ruby/1.9.1/gems/railties-3.2.13/lib/rails/engine.rb:479:in `call'
ruby/1.9.1/gems/railties-3.2.13/lib/rails/application.rb:223:in `call'
ruby/1.9.1/gems/railties-3.2.13/lib/rails/railtie/configurable.rb:30:in `method_missing'

I can confirm that redis-store is working for my fragment caches, and that the same URL is being used for that connection.

Here are the relevant lines from my environment file:

# config/environments/production.rb

config.cache_store = :redis_store, "redis://REDACTED_REDIS_HOST:6379/1", { expires_in: 120.minutes }

config.action_dispatch.rack_cache = {
  metastore:   "redis://REDACTED_REDIS_HOST:6379/1/metastore",
  entitystore: "file:/tmp/cache/entitystore"
}

Should this work, or have I missed something from the readme?

[freegenie]

I confirm this is happening on master.

[freegenie]

While redis-rack-cache can be used as a stand-alone rack middleware in any rack based application, Rails included, passing this configuration hash to action_dispatch.rack_cache tries to plug Redis::Store as a backend for Rack::Cache. This is currently not supported.

[jkrall]

Just ran into this... @freegenie I don't quite follow your comment. Are you saying the redis-rails README is not correct? Or that there's a bug on master?

[deevis]

OK - so do we need to take the action_dispath.rack_cache configuration out of the redis-rails README? Do we need to manually configure the Rack::Cache in our own middleware stack? Some updates to the README or addressing this issue to have functionality consistent with the README would be greatly appreciated!

[jodosha]

@deevis Which Rails version are you using? Because rack-cache has been removed from 4 ( http://rubygems.org/gems/actionpack/versions/4.0.0 vs http://rubygems.org/gems/actionpack/versions/3.2.14 ).

Anyway, feel free to open a pull request here https://github.com/redis-store/redis-rails

Thanks

[joe1chen]

You just need to add to your Gemfile

gem 'redis-rack-cache'

[Ingary]

Hi, I have the same problem described in this post.
I'm working with rails 4.0.1, ruby 2.0 and the latest versions of redis.

Basically I tried adding gems redis-rack-cache and rack-cache, but apparently the configuration is not detected.

The configuration I have tried is:

#environments/development.rb
config.action_dispatch.rack_cache = {
: verbose => true,
: MetaStore => 'redis :/ / 127.0.0.1:6379 / 0',
: entitystore => 'redis :/ / 127.0.0.1:6379 / 0'
}

I have also tried:

config.middleware.use Rack :: Cache,
: verbose => true,
: MetaStore => 'redis :/ / 127.0.0.1:6379 / 0',
: entitystore => 'redis :/ / 127.0.0.1:6379 / 0'

I always get a response like:
cache: [GET / api/home/10/1] miss

and revise redis indeed never saved anything.

I have set the configuration in development, because I would like to test. No if that creates problems.

Any idea what's happening? Any help will be highly appreciated.

[mmahalwy]

any update on this?

[radar]

If there was it would be posted here.

On 27 Jun 2015, at 07:49, Mohamed El Mahallawy notifications@github.com wrote:

any update on this?

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Reply to this email directly or view it on GitHub.

[tubbo]

@Ingary your configuration is somewhat strange...it should be :metastore, not :MetaStore.

[CaioBianchi]

I'm still experiencing the same issue with the :metastore provider.

[jfloff]

bump

[tubbo]

@CaioBianchi @jfloff what version is installed (cat Gemfile.lock | grep redis-store)? also, can you paste your rack-cache config?

[helmiattastify]

@tubbo

config.action_dispatch.rack_cache = {
metastore: "redis://localhost:6379/1",
entitystore: "redis://localhost:6379/1",
verbose: true,
compress: true
# NOTE: :meta_store and :entity_store are also supported.
}

cache: [GET /api/users] miss

gem 'redis-rack-cache', github: "redis-store/redis-rack-cache"

when I remove that gem return pass

[jfloff]

I just got this error again 😅 . I have the latest version 1.10.0 installed and I'm running on Rails 6.

My configuration looks like this:

rack_cache = {
    metastore: ::Rack::Cache::MetaStore::Redis.new("#{ENV['REDIS_TLS_URL']}/1/metastore", ssl_params: { verify_mode: OpenSSL::SSL::VERIFY_NONE }),
    entitystore: ::Rack::Cache::EntityStore::Redis.new("#{ENV['REDIS_TLS_URL']}/1/entitystore", ssl_params: { verify_mode: OpenSSL::SSL::VERIFY_NONE }),
  }

[radar]

@jfloff would you mind opening a new issue, as this one is quite old? And please show us how that rack_cache variable is being used.