2.10.3

2.10.3

New Features

• The AppSyncClient's subscribe method now accepts an optional statusChangeHandler. If provided, then the AWSAppSyncSubscriptionWatcher
  returned by the subscribe method will invoke that method when it is notified of changes to the state of the underlying MQTT client.
  AWSAppSyncSubscriptionWatcherStatus for a description of the statuses and their progression. Thanks @fans3210, @shannon-hager-skookum, and @achager for
  contributing your thoughts to the original request (Issue #42) and to
  @MarioBajr for contributing the original implementation on PR #75.
• Added a queuedMutationCount property to AppSyncClient (Issue #192)

Bug fixes

• Fixed incorrect AWSCore dependency version in podspec (Issue #190)
• Fixed data races in AppSyncMQTTClient that were causing crashes (Issue #184)

Misc. Updates

• Added AWSAppSyncClientLogFormatter utility class. Developers who want to use it can add it to the appropriate logger. For example, a configuration like:

  AWSDDLog.sharedInstance.logLevel = .verbose
  AWSDDTTYLogger.sharedInstance.logFormatter = AWSAppSyncClientLogFormatter()
  AWSDDLog.sharedInstance.add(AWSDDTTYLogger.sharedInstance)

  would output log messages like:

  2019-03-04 07:21:32.131-0800 [I AWSAppSyncClient.init(appSyncConfig:reachabilityFactory:), L75] Initializing AppSyncClient
  2019-03-04 07:21:32.135-0800 [V AWSPerformMutationQueue.init(appSyncClient:networkClient:reachabiltyChangeNotifier:cacheFileURL:), L24] Initializing AWSPerformMutationQueue
  2019-03-04 07:21:32.135-0800 [V AWSPerformMutationQueue.resume(), L95] Resuming OperationQueue
  

  Please note that verbose logging is quite verbose, and there is a significant difference between verbose and debug. We will be making
  debug more useful as we go. (See Issue #145)

  As always, we recommend turning off logging when deploying to production.

• Added some verbose logging around mutation queue handling and subscription connections; minor log additions elsewhere

• Minor dead code removal & miscellaneous cleanup