Hit ratio statistics #210

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1. zzzeek commented on Aug 29, 2021

   

   zzzeek

   on Aug 29, 2021

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   I would implement this by intercepting calls to the backend, which you can do using ProxyBackend. we can add examples to https://dogpilecache.sqlalchemy.org/en/latest/recipes.html if someone wants to come up with this.

   👍React with 👍2Reacted by megan-carey and Riyad Parvez
2. zzzeek

   added

   questionFurther information is requestedFurther information is requested

   on Aug 29, 2021
3. megan-carey commented on Nov 19, 2021

   

   megan-carey

   on Nov 19, 2021

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   Upvote for adding a metrics collection example to the recipes page :)
4. jvanasco commented on Jan 17, 2022

   

   jvanasco

   on Jan 17, 2022

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   FWIW, I open sourced a Pyramid plugin to do this a few years ago, which illustrates how to accomplish this.

   The package offers a DogpileLoggingProxy proxy object - derived from ProxyBackend - which is used to track all the Dogpile API calls, and stashes the metrics on the request object.

   https://github.com/jvanasco/pyramid_debugtoolbar_dogpile
5. glaucocustodio commented on Aug 11, 2023

   

   glaucocustodio

   on Aug 11, 2023

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   If you are using Redis as backend, you should override set_serialized and get_serialized instead as get and set are not implemented on this backend. Eg:

   from dogpile.cache import make_region
   from dogpile.cache.proxy import ProxyBackend
   from dogpile.cache.api import NO_VALUE
   
   class ReportingProxy(ProxyBackend):
       def set_serialized(self, key, value):
           # report cache miss
           self.proxied.set_serialized(key, value)
   
       def get_serialized(self, key):
           cached = self.proxied.get_serialized(key)
   
           if cached != NO_VALUE:
               # report cache hit
               pass
   
           return cached
   
   region = make_region().configure(
       'dogpile.cache.redis',
       arguments={
           'url': 'redis://localhost:6379/0',  # Redis connection URL
           'distributed_lock': True,  # Use distributed lock to prevent dogpiling
           'thread_local_lock': False,
       },
       wrap=[ReportingProxy],
   )