Flush redis after configuration changes that could affect cache integrity.

lib/db.coffee

@@ -27,6 +27,29 @@ presetsCollection = null
 objectsCollection = null
 
 
+# Only flush redis DB if aliases or custom commands config has changed
+flushRedis = (callback) ->
+  redisClient.get('config_hash', (err, res) ->
+    return callback(err) if err
+
+    hash = require('crypto')
+      .createHash('md5')
+      .update(JSON.stringify(config.PARAMETERS))
+      .update(JSON.stringify(config.CUSTOM_COMMANDS))
+      .digest('hex')
+
+    if res == hash
+      return callback()
+
+    redisClient.flushdb((err) ->
+      return callback(err) if err
+      redisClient.set('config_hash', hash, (err, res) ->
+        return callback(err)
+      )
+    )
+  )
+
+
 connect = (callback) ->
   callbackCounter = 6
   mongodb.MongoClient.connect(config.MONGODB_CONNECTION_URL, {db:{w:1},server:{autoReconnect:true}}, (err, db) ->
@@ -72,11 +95,17 @@ connect = (callback) ->
 
     exports.redisClient = redisClient = redis.createClient(config.REDIS_PORT, config.REDIS_HOST)
     redisClient.select(config.REDIS_DB, (err) ->
+      if err
+        callbackCounter = 0
+        return callback(err)
+
+      flushRedis((err) ->
         if --callbackCounter == 0 or err
           callbackCounter = 0
           return callback(err)
       )
     )
+  )
 
 
 disconnect = () ->