Commits on Feb 21, 2024

1. Implement #watch and #multi specially for cluster-client …

   This PR makes watch & multi work more or less the same way for
   clustering as they do for normal redis.
   
   Since it's supposed to be valid to perform your multi call on the
   original redis object, like this:
   
   ```
   redis.watch('key') do
     redis.multi do |tx|
       # tx is performed on the same connection as the watch
     end
   end
   ```
   
   we need to keeps some state in an ivar @active_watcher so we know to
   call MULTI on the same actual connection as WATCH (and appropriately
   fail if the keys got redirected or the node went down). This is
   technically threadsafe, because the watch/multi implementation is
   wrapped in the `synchronize` monitor; however, for good performance in
   multithreaded environments, you will most likely want to use a
   connection pool of Redis::Cluster instances.

   

   KJTsanaktsidis committed Feb 21, 2024
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