Error handling code for Bedrock doesn't work for exception message types

[preston-m-price]

There is an error in the SDK here:

anthropic-sdk-go/bedrock/bedrock.go

Lines 99 to 100 in eafcc8d

	case eventstreamapi.ExceptionMessageType:
	case eventstreamapi.ErrorMessageType:

In Go, case statements don't fall through. So what we have here is a noop handler for the ExceptionMessageType case.

I learned this while trying to debug an empty response stream for a payload like:

"messages": [
  {
    "role": "user",
    "content": "Tell me a good joke please."
  },
  {
    "role": "assistant",
    "content": "Sure, "
  }]
}

It turns out the Bedrock API is telling the client there is an exception because the last assistant message cannot have trailing whitespace, but the exception returned by Bedrock is eaten by the noop for the ExceptionMessageType case.

This is a one-liner fix. Either update the code to:

case eventstreamapi.ExceptionMessageType:
  fallthrough // <--------- add this
case eventstreamapi.ErrorMessageType:

or

case eventstreamapi.ExceptionMessageType, case eventstreamapi.ErrorMessageType:

[yjp20]

Hey! This should now be fixed as of release: 0.2.0-alpha.8, please let us know if you run into any more problems!