Cache persistence on domain name

The following is an approximation of the logic used by the cache rule command. However, it does not remap uri's to a new cache member when a cache member goes down. In this rule, that is instead handled at the time a request for the uri comes in. I don't foresee this really being an issue though.

Here's the rule:

 
 when HTTP_REQUEST { 
    if {  } { 
       pool cache_pool 
       set key [crc32 [concat [domain [HTTP::host] 2] [HTTP::uri]]] 
       set cache_mbr [persist lookup hash $key node] 
       if { $cache_mbr ne "" } { 
           Make sure request isn't coming from the cache 
          if { [IP::addr [IP::remote_addr] equals $cache_mbr] } { 
              Yup, send the request from the cache to the origin pool 
             pool origin_pool 
             return 
          } 
       } 
        Make sure persistence record is added for this host/uri 
       persist hash $key 
    } else { 
       pool origin_pool 
    } 
 } 
 

Substitute with whatever expression you would use to determine whether or not you want to send requests to the cache pool.