sfertman / redis-atom

Share clojure atoms between services via redis with one line of code

redis-atom

Share clojure atoms between services via redis with one line of code.

Using

Define redis connection spec like with taoensso.carmine. Define an atom by passing in the connetion spec, a key that will point to the atom value on Redis and the atom value. Note that if the input key already exists on redis backend then the input value will not be assigned to it. Everything else is exactly the same as with Clojure atoms.

(require '[redis-atom.core :refer [redis-atom]])

(def conn {:pool {} :spec {:uri "redis://localhost:6379"}})

(def a (redis-atom conn :redis-key {:my-data "42" :more-data 43}))

a ; => #object[redis_atom.core.RedisAtom 0x471a378 {:status :ready, :val {:my-data "42", :more-data 43}}]
@a ; => {:my-data "42" :more-data 43}

(def b (redis-atom conn :redis-key 42))
@b ; => {:my-data "42" :more-data 43}

(reset! a 42) ; => 42
@b ; => 42

(reset-vals! a 43) ; => [42 43]
(swap! a inc) ; => 44
(swap-vals! a inc) ; => [44 45]

Testing

Running the test suite requires redis backend service which can be easily created with docker-compose. To start a local backend:

$ cd redis
$ docker-compose up -d

This will start a redis server on 6379 and a redis-commander on 8081. If you are a fan of redis-cli, run redis-cli.sh script in the same dir for the console.