class Aws::InstanceProfileCredentials

def refresh
  # Retry loading credentials up to 3 times is the instance metadata
  # service is responding but is returning invalid JSON documents
  # in response to the GET profile credentials call.
  retry_errors([JSON::ParserError, StandardError], max_retries: 3) do
    c = JSON.parse(get_credentials.to_s)
    @credentials = Credentials.new(
      c['AccessKeyId'],
      c['SecretAccessKey'],
      c['Token']
    )
    @expiration = c['Expiration'] ? Time.parse(c['Expiration']) : nil
  end
end