[FSSDK-9508] refact: Implements a warning log for polling interval less than 30s (#515)

* Implements a warning log for polling interval less than 30s

Author: yasirfolio3

Sources/Extensions/OptimizelyClient+Extension.swift

@@ -81,6 +81,9 @@ extension OptimizelyClient {
 
         let interval = periodicDownloadInterval ?? 10 * 60
         if interval > 0 {
+            if interval < 30 {
+                logger?.w(.lowPeriodicDownloadInterval)
+            }
             self.datafileHandler?.setPeriodicInterval(sdkKey: sdkKey, interval: interval)
         }
     }

Sources/Utils/LogMessage.swift

@@ -1,5 +1,5 @@
 //
-// Copyright 2019-2021, Optimizely, Inc. and contributors
+// Copyright 2019-2021, 2023 Optimizely, Inc. and contributors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -67,6 +67,7 @@ enum LogMessage {
     case failedToConvertMapToString
     case failedToAssignValue
     case valueForKeyNotFound(_ key: String)
+    case lowPeriodicDownloadInterval
 }
 
 extension LogMessage: CustomStringConvertible {
@@ -128,6 +129,7 @@ extension LogMessage: CustomStringConvertible {
         case .failedToConvertMapToString:                                       message = "Provided map could not be converted to string."
         case .failedToAssignValue:                                              message = "Value for path could not be assigned to provided type."
         case .valueForKeyNotFound(let key):                                     message = "Value for JSON key (\(key)) not found."
+        case .lowPeriodicDownloadInterval:                                      message = "Polling intervals below 30 seconds are not recommended."
         }
 
         return message