Merge pull request #28757 from edwardmp/log-actioncable-write-read-errors

Log any write errors originating from the socket

actioncable/CHANGELOG.md

+*   ActionCable socket errors are now logged to the console
+
+    Previously any socket errors were ignored and this made it hard to diagnose socket issues (e.g. as discussed in #28362).
+
+    *Edward Poot*
+    
 Please check [5-1-stable](https://github.com/rails/rails/blob/5-1-stable/actioncable/CHANGELOG.md) for previous changes.

actioncable/lib/action_cable/connection/base.rb

@@ -126,7 +126,8 @@ def on_message(message) # :nodoc:
       end
 
       def on_error(message) # :nodoc:
-        # ignore
+        # log errors to make diagnosing socket errors easier
+        logger.error "WebSocket error occurred: #{message}"
       end
 
       def on_close(reason, code) # :nodoc: