Move some utils into middleware/utils

server/middleware/utils/createCache.js

@@ -0,0 +1,29 @@
+const db = require('../../RedisClient')
+
+function createCache(keyPrefix) {
+  function createKey(key) {
+    return keyPrefix + '-' + key
+  }
+
+  function set(key, value, expiry, callback) {
+    db.setex(createKey(key), expiry, JSON.stringify(value), callback)
+  }
+
+  function get(key, callback) {
+    db.get(createKey(key), function (error, value) {
+      callback(error, value && JSON.parse(value))
+    })
+  }
+
+  function del(key, callback) {
+    db.del(createKey(key), callback)
+  }
+
+  return {
+    set,
+    get,
+    del
+  }
+}
+
+module.exports = createCache