WaitlistEntryFailure 定义

// Status data that conveys why creating a waitlist entry fails.
// If there is a business logic error that is not captured here, please
// reach out to the Reserve with Google team to add it to this list. Other
// errors should be returned using standard HTTP error codes.
message WaitlistBusinessLogicFailure {
  enum Cause {
    // Default value: Dont' use; amounts to an u"nknown error
"    // Unexpected errors must be returned using standard HTTP error codes.
    CAUSE_UNSPECIFIED = 0;

    // The user has already booked a waitlist entry with the partner.
    EXISTING_WAITLIST_ENTRY = 1;

    // The requested party size is below the merchant’s minimum.
    BELOW_MIN_PARTY_SIZE = 2;

    // The requested party size is above the merchant’s maximum.
    ABOVE_MAX_PARTY_SIZE = 3;

    // The requested merchant is currently closed.
    MERCHANT_CLOSED = 4;

    // There is currently no wait and the user should walk in without joining
    // the waitlist.
    NO_WAIT = 5;

    // The waitlist is at capacity and new users are not being accepted at this
    // time.
    WAITLIST_FULL = 6;

    // The country of the phone number is not supported.
    PHONE_NUMBER_COUNTRY_UNSUPPORTED = 7;

    // The waitlist is closed and not accepting new users. This is expected when
    // the waitlist enters state CLOSED_OTHER after the user has already seen a
    // wait estimate.
    WAITLIST_CLOSED = 8;
  }

  // Required. The reason why the booking failed.
  Cause cause = 1;

  // This optional field is used for the partner to include additional
  // information for debugging purposes only.
  string description = 2;
}