81 lines
2.7 KiB
C#
81 lines
2.7 KiB
C#
using Dinah.Core;
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using Newtonsoft.Json.Linq;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.IO.Compression;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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#nullable enable
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namespace FileManager
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{
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public sealed class LogArchiver : IAsyncDisposable, IDisposable
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{
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public Encoding Encoding { get; set; }
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public string FileName { get; }
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private readonly ZipArchive archive;
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public LogArchiver(string filename) : this(filename, Encoding.UTF8) { }
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public LogArchiver(string filename, Encoding encoding)
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{
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FileName = ArgumentValidator.EnsureNotNull(filename, nameof(filename));
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Encoding = ArgumentValidator.EnsureNotNull(encoding, nameof(encoding));
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archive = new ZipArchive(File.Open(FileName, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite), ZipArchiveMode.Update, false, Encoding);
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}
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public void DeleteOlderThan(DateTime cutoffDate)
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=> DeleteEntries(archive.Entries.Where(e => e.LastWriteTime < cutoffDate).ToList());
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public void DeleteOldestN(int quantity)
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=> DeleteEntries(archive.Entries.OrderBy(e => e.LastWriteTime).Take(quantity).ToList());
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public void DeleteAllButNewestN(int quantity)
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=> DeleteEntries(archive.Entries.OrderByDescending(e => e.LastWriteTime).Skip(quantity).ToList());
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private void DeleteEntries(List<ZipArchiveEntry> entries)
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{
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foreach (var e in entries)
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e.Delete();
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}
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public async Task AddFileAsync(string name, JObject contents, string? comment = null)
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{
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ArgumentValidator.EnsureNotNull(contents, nameof(contents));
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await AddFileAsync(name, Encoding.GetBytes(contents.ToString(Newtonsoft.Json.Formatting.Indented)), comment);
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}
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public async Task AddFileAsync(string name, string contents, string? comment = null)
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{
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ArgumentValidator.EnsureNotNull(contents, nameof(contents));
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await AddFileAsync(name, Encoding.GetBytes(contents), comment);
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}
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public Task AddFileAsync(string name, ReadOnlyMemory<byte> contents, string? comment = null)
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{
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ArgumentValidator.EnsureNotNull(name, nameof(name));
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name = ReplacementCharacters.Barebones(true).ReplaceFilenameChars(name);
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return Task.Run(() => AddFileInternal(name, contents.Span, comment));
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}
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private readonly object lockObj = new();
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private void AddFileInternal(string name, ReadOnlySpan<byte> contents, string? comment)
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{
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lock (lockObj)
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{
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var entry = archive.CreateEntry(name, CompressionLevel.SmallestSize);
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entry.Comment = comment;
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using var entryStream = entry.Open();
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entryStream.Write(contents);
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}
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}
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public async ValueTask DisposeAsync() => await Task.Run(archive.Dispose);
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public void Dispose() => archive.Dispose();
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}
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}
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