VdaStateSessionGuardEvaluator.cs
1.81 KB
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using Rcs.Application.Services.Protocol;
namespace Rcs.Infrastructure.Services.Protocol;
/// <summary>
/// VDA State 与最新 Normal 下发会话的强一致判定器。
/// </summary>
internal static class VdaStateSessionGuardEvaluator
{
/// <summary>
/// 判断当前 State 是否覆盖最近一次 Normal 通道下发会话。
/// 返回 true 表示可放行；false 表示必须阻断。
/// </summary>
public static bool IsStateCoveringLatestNormalSession(
VdaOrderGateSession? session,
string? stateOrderId,
uint? stateOrderUpdateId,
out string reason)
{
if (session == null)
{
reason = "no_active_normal_session";
return true;
}
if (session.Channel != VdaOrderChannel.Normal)
{
reason = "non_normal_session";
return true;
}
if (session.Status is VdaOrderSessionStatus.Failed or VdaOrderSessionStatus.Completed)
{
reason = "normal_session_inactive";
return true;
}
if (session.Status is not (VdaOrderSessionStatus.Sending or VdaOrderSessionStatus.Sent))
{
reason = "normal_session_unchecked_status";
return true;
}
if (!string.Equals(stateOrderId ?? string.Empty, session.OrderId ?? string.Empty, StringComparison.OrdinalIgnoreCase))
{
reason = "state_order_id_mismatch";
return false;
}
var expectedOrderUpdateId = (uint)Math.Max(0, session.OrderUpdateId);
var currentOrderUpdateId = stateOrderUpdateId ?? 0u;
if (currentOrderUpdateId < expectedOrderUpdateId)
{
reason = "state_order_update_not_caught_up";
return false;
}
reason = "ok";
return true;
}
}