Simple library to share redis clients in a code base
npm install redis-manager
var redisManager = require('redis-manager'); var client = redisManager.getClient(); // Same options as `redis.createClient`, is an instance of `redis`'s client, but the args can be specified in any order desired client.set('key', 'val', callback); // ... // All done? Free the client so the manager can shut it down if no one is using it, anymore. redisManager.freeClient(client);
Pub/sub and select wrinkle
The Redis library, whenever a
subscribe method is called, puts the instance in a special mode that disables all other Redis commands. Therefore this kind of redis connection cannot be pooled unless distinguished during configuration, so a
sub property has been added to the
options parameter when getting a client. If you need subscribe Redis usage, be sure to pass in this flag. (Currently works on the honor system.)
Further, whenever a
select method is called, the semantics of
hget/etc change, and a common redis instance shared between code trying to read/write different databases is a Bad Thing(tm).
Event Listener Corner Case
If two instances of redis-manager pointing at the same actual client register the exact same listener (
listenerA === listenerB), when the first instance is freed, both registered listeners will be eliminated as it removes listeners created by the instance being freed. This is very unlikely to ever be the case as even identical code between two files wold be considered different functions (because of differing scope), but is possible.
Copyright (C) 2013 by Uber Technologies, Inc
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