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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def run(self):
 """ Creates a new replica using WAL-E Returns ------- ExitCode 0 = Success 1 = Error, try again 2 = Error, don't try again """

        if self.init_error:
            logger.error('init error: %r did not exist at initialization time',
                         self.wal_e.env_dir)
            return ExitCode.FAIL

        try:
            should_use_s3 = self.should_use_s3_to_create_replica()
            if should_use_s3 is None:  # Need to retry
                return ExitCode.RETRY_LATER
            elif should_use_s3:
                return self.create_replica_with_s3()
            elif not should_use_s3:
                return ExitCode.FAIL
        except Exception:
            logger.exception("Unhandled exception when running WAL-E restore")
        return ExitCode.FAIL