Add key prefix option for cache

[leplatrem]

• Add a setting cliquet.cache_prefix (default: '')
• Every cache entry key is prefixed by self.prefix in cache backend classes

[lavish205]

I want to work on this bug, looking forward for instructions to start.

[leplatrem]

When a key is passed to a method of the cache backend (e.g. here), it should be concatenated to a prefix coming from the settings.

That means the key prefix should be passed to the constructor of cache backend (e.g. here)

[lavish205]

I have few doubts

• In which file we are supposed to add a setting cliquet.cache_prefix (default: '')
• What is self.prefix exactly here? I can't see any variable named prefix in CacheBase class.
• And if it is supposed to passed to constructor here, then what will be the value of key prefix?

[leplatrem]

I will try to answer your questions:

In which file we are supposed to add a setting

in cliquet/__init__.py, you define the default settings values.

What is self.prefix exactly here?

This is value received from the constructor of the Cache backend. It does not exist yet and should be added.
It will be used in the cache backend to concatenate with the key passed in arguments of each method.

what will be the value of key prefix ?

in the load_from_config function, you obtain the setting from the config object:

settings = config.get_settings()
prefix = settings['cache_prefix']
backend = Cache(prefix=prefix)
return backend

Hope this helps ;)