Enhance error handling in failover / retry helper

Author: peterbanda

openai-core/src/main/scala/io/cequence/openaiscala/RetryHelpers.scala

@@ -148,15 +148,25 @@ trait RetryHelpers {
       ec: ExecutionContext,
       scheduler: Scheduler
     ): Future[T] = {
+      assert(
+        inputsAndMessagesToTryInOrder.nonEmpty || lastException.nonEmpty,
+        "At least one input or last exception must be defined!"
+      )
+
       inputsAndMessagesToTryInOrder match {
         case Nil =>
-          val lastExceptionMessage = lastException.map(_.getMessage).getOrElse("N/A")
-          Future.failed(
-            new OpenAIScalaClientException(
-              s"No more failover inputs to try! Last error: ${lastExceptionMessage}"
+          val lastExceptionActual = lastException.getOrElse(
+            throw new OpenAIScalaClientException(
+              s"Should never happen. No last exception provided!"
             )
           )
 
+          logger.error(
+            s"No more failover inputs to try! Throwing the last error: ${lastExceptionActual.getMessage}"
+          )
+
+          Future.failed(lastExceptionActual)
+
         case _ =>
           val (input, inputLogMessage) = inputsAndMessagesToTryInOrder.head
 

openai-examples/src/main/scala/io/cequence/openaiscala/examples/Example.scala

@@ -23,6 +23,7 @@ trait ExampleBase[T <: CloseableService] {
 
   def main(args: Array[String]): Unit = {
     run.recover { case e: Exception =>
+      println("Error received:")
       e.printStackTrace()
       closeAll()
       System.exit(1)