YooAssetScene/Assets/YooAsset/Samples~/Extension Sample/Runtime/WechatFileSystem/WechatFileSystem.cs

#if UNITY_WECHAT_GAME
using System.Collections.Generic;
using UnityEngine;
using YooAsset;
using WeChatWASM;

public static class WechatFileSystemCreater
{
    public static FileSystemParameters CreateWechatFileSystemParameters(IRemoteServices remoteServices)
    {
        string fileSystemClass = $"{nameof(WechatFileSystem)},YooAsset.RuntimeExtension";
        var fileSystemParams = new FileSystemParameters(fileSystemClass, null);
        fileSystemParams.AddParameter("REMOTE_SERVICES", remoteServices);
        return fileSystemParams;
    }
}

/// <summary>
/// 微信小游戏文件系统
/// 参考：https://wechat-miniprogram.github.io/minigame-unity-webgl-transform/Design/UsingAssetBundle.html
/// </summary>
internal class WechatFileSystem : IFileSystem
{
    private readonly Dictionary<string, string> _wxFilePaths = new Dictionary<string, string>(10000);
    private WXFileSystemManager _wxFileSystemMgr;
    private string _wxFileCacheRoot = string.Empty;

    /// <summary>
    /// 包裹名称
    /// </summary>
    public string PackageName { private set; get; }

    /// <summary>
    /// 文件根目录
    /// </summary>
    public string FileRoot
    {
        get
        {
            return _wxFileCacheRoot;
        }
    }

    /// <summary>
    /// 文件数量
    /// </summary>
    public int FileCount
    {
        get
        {
            return 0;
        }
    }

    #region 自定义参数
    /// <summary>
    /// 自定义参数：远程服务接口
    /// </summary>
    public IRemoteServices RemoteServices { private set; get; } = null;
    #endregion


    public WechatFileSystem()
    {
    }
    public virtual FSInitializeFileSystemOperation InitializeFileSystemAsync()
    {
        var operation = new WXFSInitializeOperation(this);
        OperationSystem.StartOperation(PackageName, operation);
        return operation;
    }
    public virtual FSLoadPackageManifestOperation LoadPackageManifestAsync(string packageVersion, int timeout)
    {
        var operation = new WXFSLoadPackageManifestOperation(this, packageVersion, timeout);
        OperationSystem.StartOperation(PackageName, operation);
        return operation;
    }
    public virtual FSRequestPackageVersionOperation RequestPackageVersionAsync(bool appendTimeTicks, int timeout)
    {
        var operation = new WXFSRequestPackageVersionOperation(this, timeout);
        OperationSystem.StartOperation(PackageName, operation);
        return operation;
    }
    public virtual FSClearAllBundleFilesOperation ClearAllBundleFilesAsync()
    {
        var operation = new FSClearAllBundleFilesCompleteOperation();
        OperationSystem.StartOperation(PackageName, operation);
        return operation;
    }
    public virtual FSClearUnusedBundleFilesOperation ClearUnusedBundleFilesAsync(PackageManifest manifest)
    {
        var operation = new FSClearUnusedBundleFilesCompleteOperation();
        OperationSystem.StartOperation(PackageName, operation);
        return operation;
    }
    public virtual FSDownloadFileOperation DownloadFileAsync(PackageBundle bundle, DownloadParam param)
    {
        param.MainURL = RemoteServices.GetRemoteMainURL(bundle.FileName);
        param.FallbackURL = RemoteServices.GetRemoteFallbackURL(bundle.FileName);
        var operation = new WXFSDownloadFileOperation(this, bundle, param);
        OperationSystem.StartOperation(PackageName, operation);
        return operation;
    }
    public virtual FSLoadBundleOperation LoadBundleFile(PackageBundle bundle)
    {
        var operation = new WXFSLoadBundleOperation(this, bundle);
        OperationSystem.StartOperation(PackageName, operation);
        return operation;
    }
    public virtual void UnloadBundleFile(PackageBundle bundle, object result)
    {
        AssetBundle assetBundle = result as AssetBundle;
        if (assetBundle != null)
            assetBundle.WXUnload(true);
    }

    public virtual void SetParameter(string name, object value)
    {
        if (name == "REMOTE_SERVICES")
        {
            RemoteServices = (IRemoteServices)value;
        }
        else
        {
            YooLogger.Warning($"Invalid parameter : {name}");
        }
    }
    public virtual void OnCreate(string packageName, string rootDirectory)
    {
        PackageName = packageName;

        _wxFileSystemMgr = WX.GetFileSystemManager();
        _wxFileCacheRoot = WX.env.USER_DATA_PATH; //注意：如果有子目录，请修改此处！
    }
    public virtual void OnUpdate()
    {
    }

    public virtual bool Belong(PackageBundle bundle)
    {
        return true;
    }
    public virtual bool Exists(PackageBundle bundle)
    {
        string filePath = GetWXFileLoadPath(bundle);
        string result = _wxFileSystemMgr.AccessSync(filePath);
        return result.Equals("access:ok");
    }
    public virtual bool NeedDownload(PackageBundle bundle)
    {
        if (Belong(bundle) == false)
            return false;

        return Exists(bundle) == false;
    }
    public virtual bool NeedUnpack(PackageBundle bundle)
    {
        return false;
    }
    public virtual bool NeedImport(PackageBundle bundle)
    {
        return false;
    }

    #region 内部方法
    private string GetWXFileLoadPath(PackageBundle bundle)
    {
        if (_wxFilePaths.TryGetValue(bundle.BundleGUID, out string filePath) == false)
        {
            filePath = PathUtility.Combine(_wxFileCacheRoot, bundle.FileName);
            _wxFilePaths.Add(bundle.BundleGUID, filePath);
        }
        return filePath;
    }
    #endregion
}
#endif