fix: more economical use of redis clients

packages/medusa/package.json

@@ -58,6 +58,7 @@
     "express-session": "^1.17.1",
     "fs-exists-cached": "^1.0.0",
     "glob": "^7.1.6",
+    "ioredis": "^4.17.3",
     "joi-objectid": "^3.0.1",
     "jsonwebtoken": "^8.5.1",
     "medusa-core-utils": "^1.0.0-alpha.30",

packages/medusa/src/services/event-bus.js

@@ -1,4 +1,5 @@
 import Bull from "bull"
+import Redis from "ioredis"
 import config from "../config"
 /**
  * Can keep track of multiple subscribers to different events and run the
@@ -19,8 +20,25 @@ class EventBusService {
     /** @private {BullQueue} used for cron jobs */
     this.cronQueue_ = new Bull(`cron-jobs:queue`, config.redisURI)
 
+    // Economical way of dealing with redis clients
+    const client = new Redis(config.redisURI)
+    const subscriber = new Redis(config.redisURI)
+
+    const opts = {
+      createClient: type => {
+        switch (type) {
+          case "client":
+            return client
+          case "subscriber":
+            return subscriber
+          default:
+            throw new Error("Unknown type: ", type)
+        }
+      },
+    }
+
     /** @private {BullQueue} */
-    this.queue_ = new Bull(`${this.constructor.name}:queue`, config.redisURI)
+    this.queue_ = new Bull(`${this.constructor.name}:queue`, opts)
 
     // Register our worker to handle emit calls
     this.queue_.process(this.worker_)

packages/medusa/yarn.lock

@@ -3478,6 +3478,21 @@ ioredis@^4.14.1:
     redis-parser "^3.0.0"
     standard-as-callback "^2.0.1"
 
+ioredis@^4.17.3:
+  version "4.17.3"
+  resolved "https://registry.yarnpkg.com/ioredis/-/ioredis-4.17.3.tgz#9938c60e4ca685f75326337177bdc2e73ae9c9dc"
+  integrity sha512-iRvq4BOYzNFkDnSyhx7cmJNOi1x/HWYe+A4VXHBu4qpwJaGT1Mp+D2bVGJntH9K/Z/GeOM/Nprb8gB3bmitz1Q==
+  dependencies:
+    cluster-key-slot "^1.1.0"
+    debug "^4.1.1"
+    denque "^1.1.0"
+    lodash.defaults "^4.2.0"
+    lodash.flatten "^4.4.0"
+    redis-commands "1.5.0"
+    redis-errors "^1.2.0"
+    redis-parser "^3.0.0"
+    standard-as-callback "^2.0.1"
+
 ip-regex@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/ip-regex/-/ip-regex-2.1.0.tgz#fa78bf5d2e6913c911ce9f819ee5146bb6d844e9"