problem: tries to connect to Redis even if specified as disabled

src/main/kotlin/io/emeraldpay/dshackle/config/CacheConfigReader.kt

@@ -35,19 +35,22 @@ class CacheConfigReader : YamlConfigReader(), ConfigReader<CacheConfig> {
             val config = CacheConfig()
             getMapping(node, "redis")?.let { node ->
                 val redis = CacheConfig.Redis()
-                getValueAsString(node, "host")?.let {
-                    redis.host = it
+                val enabled = getValueAsBool(node, "enabled") ?: true
+                if (enabled) {
+                    getValueAsString(node, "host")?.let {
+                        redis.host = it
+                    }
+                    getValueAsInt(node, "port")?.let {
+                        redis.port = it
+                    }
+                    getValueAsInt(node, "db")?.let {
+                        redis.db = it
+                    }
+                    getValueAsString(node, "password")?.let {
+                        redis.password = it
+                    }
+                    config.redis = redis
                 }
-                getValueAsInt(node, "port")?.let {
-                    redis.port = it
-                }
-                getValueAsInt(node, "db")?.let {
-                    redis.db = it
-                }
-                getValueAsString(node, "password")?.let {
-                    redis.password = it
-                }
-                config.redis = redis
             }
             if (config.redis == null) {
                 return null

src/test/groovy/io/emeraldpay/dshackle/config/CacheConfigReaderSpec.groovy

@@ -36,4 +36,15 @@ class CacheConfigReaderSpec extends Specification {
             password == "HelloWorld!1"
         }
     }
+
+    def "Read disabled"() {
+        setup:
+        def config = this.class.getClassLoader().getResourceAsStream("cache-redis-disabled.yaml")
+        when:
+        def act = reader.read(config)
+
+        then:
+        //later may be not null if we support something else besides Redis
+        act == null
+    }
 }

src/test/resources/cache-redis-disabled.yaml

@@ -0,0 +1,7 @@
+cache:
+  redis:
+    enabled: false
+    host: redis-master
+    port: 1234
+    db: 5
+    password: HelloWorld!1