When this callback returns true, pollMessages will exit it's loop.
Interceptor should set err to true if it has encountered some kind of error
and wants it to be rethrown as PsqlClientException at the end of
pollMessages call. errMsg should be appended with error description.
classPSQLConnection(SocketT = StdSocket, alias logTrace = nop_logger, alias logError = nop_logger)
When this callback returns true, pollMessages will exit it's loop. Interceptor should set err to true if it has encountered some kind of error and wants it to be rethrown as PsqlClientException at the end of pollMessages call. errMsg should be appended with error description.