83 lines
2.4 KiB
C#
83 lines
2.4 KiB
C#
using MAX.Core.DependencyInjection;
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using Microsoft.Extensions.Configuration;
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using System.IO.Compression;
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using System.Text;
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namespace Store.Modules.CloudProduct.Services
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{
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/// <summary>
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/// 商品原始数据文件存储：按 goodsId % 100 分目录，文件名即商品ID，GZip 压缩保存。
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/// </summary>
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public interface IRawDataStorage : IScopedDependency
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{
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/// <summary>
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/// 保存原始数据，返回保存后的完整路径。
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/// </summary>
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Task<string> SaveAsync(long goodsId, string rawData);
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/// <summary>
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/// 读取并解压原始数据；文件不存在时返回 null。
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/// </summary>
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Task<string?> ReadAsync(long goodsId);
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/// <summary>
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/// 判断指定商品的原始数据文件是否存在。
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/// </summary>
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bool Exists(long goodsId);
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}
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internal class RawDataStorage : IRawDataStorage
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{
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private readonly string _rootPath;
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public RawDataStorage(IConfiguration configuration)
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{
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var configured = configuration.GetValue<string>("RawData:Path");
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if (string.IsNullOrWhiteSpace(configured))
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configured = "RawData";
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_rootPath = Path.GetFullPath(configured);
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}
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/// <inheritdoc />
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public async Task<string> SaveAsync(long goodsId, string rawData)
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{
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var filePath = GetFilePath(goodsId);
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var dir = Path.GetDirectoryName(filePath)!;
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Directory.CreateDirectory(dir);
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await using var fileStream = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.None);
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await using var gzip = new GZipStream(fileStream, CompressionLevel.Fastest);
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await using var writer = new StreamWriter(gzip, new UTF8Encoding(false));
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await writer.WriteAsync(rawData);
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return filePath;
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}
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/// <inheritdoc />
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public async Task<string?> ReadAsync(long goodsId)
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{
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var filePath = GetFilePath(goodsId);
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if (!File.Exists(filePath))
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return null;
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await using var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read);
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await using var gzip = new GZipStream(fileStream, CompressionMode.Decompress);
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using var reader = new StreamReader(gzip, new UTF8Encoding(false));
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return await reader.ReadToEndAsync();
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}
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/// <inheritdoc />
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public bool Exists(long goodsId)
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{
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return File.Exists(GetFilePath(goodsId));
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}
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private string GetFilePath(long goodsId)
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{
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var subDir = (goodsId % 100).ToString();
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return Path.Combine(_rootPath, subDir, goodsId.ToString());
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}
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}
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}
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