Simplify the concept of resource version

简化资源版本概念

Assets/YooAsset/Runtime/PatchSystem/Operations/UpdateStaticVersionOperation.cs

@@ -0,0 +1,134 @@
+using System.Collections;
+using System.Collections.Generic;
+using System.IO;
+using UnityEngine;
+
+namespace YooAsset
+{
+	/// <summary>
+	/// 更新静态版本操作
+	/// </summary>
+	public abstract class UpdateStaticVersionOperation : AsyncOperationBase
+	{
+		/// <summary>
+		/// 资源版本号
+		/// </summary>
+		public int ResourceVersion { protected set; get; } = 0;
+	}
+
+	/// <summary>
+	/// 编辑器下模拟运行的更新静态版本操作
+	/// </summary>
+	internal class EditorModeUpdateStaticVersionOperation : UpdateStaticVersionOperation
+	{
+		internal override void Start()
+		{
+			Status = EOperationStatus.Succeed;
+		}
+		internal override void Update()
+		{
+		}
+	}
+
+	/// <summary>
+	/// 离线模式的更新静态版本操作
+	/// </summary>
+	internal class OfflinePlayModeUpdateStaticVersionOperation : UpdateStaticVersionOperation
+	{
+		internal override void Start()
+		{
+			Status = EOperationStatus.Succeed;
+		}
+		internal override void Update()
+		{
+		}
+	}
+
+	/// <summary>
+	/// 网络模式的更新静态版本操作
+	/// </summary>
+	internal class HostPlayModeUpdateStaticVersionOperation : UpdateStaticVersionOperation
+	{
+		private enum ESteps
+		{
+			None,
+			LoadStaticVersion,
+			CheckStaticVersion,
+			Done,
+		}
+
+		private static int RequestCount = 0;
+		private readonly HostPlayModeImpl _impl;
+		private readonly int _timeout;
+		private ESteps _steps = ESteps.None;
+		private UnityWebDataRequester _downloader;
+
+		internal HostPlayModeUpdateStaticVersionOperation(HostPlayModeImpl impl, int timeout)
+		{
+			_impl = impl;
+			_timeout = timeout;
+		}
+		internal override void Start()
+		{
+			RequestCount++;
+			_steps = ESteps.LoadStaticVersion;
+		}
+		internal override void Update()
+		{
+			if (_steps == ESteps.None || _steps == ESteps.Done)
+				return;
+
+			if (_steps == ESteps.LoadStaticVersion)
+			{
+				string webURL = GetStaticVersionRequestURL(YooAssetSettings.VersionFileName);
+				YooLogger.Log($"Beginning to request static version : {webURL}");
+				_downloader = new UnityWebDataRequester();
+				_downloader.SendRequest(webURL, _timeout);
+				_steps = ESteps.CheckStaticVersion;
+			}
+
+			if (_steps == ESteps.CheckStaticVersion)
+			{
+				if (_downloader.IsDone() == false)
+					return;
+
+				if (_downloader.HasError())
+				{
+					_steps = ESteps.Done;
+					Status = EOperationStatus.Failed;
+					Error = _downloader.GetError();
+				}
+				else
+				{
+					if (int.TryParse(_downloader.GetText(), out int value))
+					{
+						ResourceVersion = value;
+						_steps = ESteps.Done;
+						Status = EOperationStatus.Succeed;
+					}
+					else
+					{						
+						_steps = ESteps.Done;
+						Status = EOperationStatus.Failed;
+						Error = $"URL : {_downloader.URL} Error : static version content is invalid.";
+					}
+				}
+				_downloader.Dispose();
+			}
+		}
+
+		private string GetStaticVersionRequestURL(string fileName)
+		{
+			string url;
+
+			// 轮流返回请求地址
+			if (RequestCount % 2 == 0)
+				url = _impl.GetPatchDownloadFallbackURL(fileName);
+			else
+				url = _impl.GetPatchDownloadMainURL(fileName);
+
+			// 注意：在URL末尾添加时间戳
+			return $"{url}?{System.DateTime.UtcNow.Ticks}";
+		}
+	}
+}