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#pragma warning disable CS1591
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using MediaBrowser.Model.IO;
namespace MediaBrowser.Controller.Providers
{
public class DirectoryService : IDirectoryService
{
// TODO replace with one shared bounded cache.
private const int MaxCachedRecords = 100_000;
private const int AccessIntervalMs = 1_000;
// Timeout cache if no access for 5 minutes.
private const int IdleTimeoutMs = 5 * 60 * 1_000;
private readonly ConcurrentDictionary<string, FileSystemMetadata[]> _cache = new(StringComparer.Ordinal);
private readonly ConcurrentDictionary<string, FileSystemMetadata> _fileCache = new(StringComparer.Ordinal);
private readonly ConcurrentDictionary<string, List<string>> _filePathCache = new(StringComparer.Ordinal);
private readonly IFileSystem _fileSystem;
// ConcurrentDictionary.Count locks the dictionary, so keep an estimated counter.
// Concurrent factory runs can overcount and a clear racing an add can undercount,
// it only has to be roughly right.
private int _recordCount;
private long _lastAccess = Environment.TickCount64;
public DirectoryService(IFileSystem fileSystem)
{
_fileSystem = fileSystem;
}
public FileSystemMetadata[] GetFileSystemEntries(string path)
{
DropCacheIfIdleOrFull();
return _cache.GetOrAdd(
path,
static (p, state) =>
{
FileSystemMetadata[] entries;
try
{
entries = state.FileSystem.GetFileSystemEntries(p).ToArray();
}
catch (DirectoryNotFoundException)
{
entries = [];
}
Interlocked.Add(ref state.Service._recordCount, entries.Length + 1);
return entries;
},
(FileSystem: _fileSystem, Service: this));
}
public List<FileSystemMetadata> GetDirectories(string path)
{
var list = new List<FileSystemMetadata>();
var items = GetFileSystemEntries(path);
for (var i = 0; i < items.Length; i++)
{
var item = items[i];
if (item.IsDirectory)
{
list.Add(item);
}
}
return list;
}
public List<FileSystemMetadata> GetFiles(string path)
{
var list = new List<FileSystemMetadata>();
var items = GetFileSystemEntries(path);
for (var i = 0; i < items.Length; i++)
{
var item = items[i];
if (!item.IsDirectory)
{
list.Add(item);
}
}
return list;
}
public FileSystemMetadata? GetFile(string path)
{
var entry = GetFileSystemEntry(path);
return entry is not null && !entry.IsDirectory ? entry : null;
}
public FileSystemMetadata? GetDirectory(string path)
{
var entry = GetFileSystemEntry(path);
return entry is not null && entry.IsDirectory ? entry : null;
}
public FileSystemMetadata? GetFileSystemEntry(string path)
{
DropCacheIfIdleOrFull();
if (!_fileCache.TryGetValue(path, out var result))
{
var file = _fileSystem.GetFileSystemInfo(path);
if (file?.Exists ?? false)
{
result = file;
if (_fileCache.TryAdd(path, result))
{
Interlocked.Increment(ref _recordCount);
}
}
}
return result;
}
public IReadOnlyList<string> GetFilePaths(string path)
=> GetFilePaths(path, false);
public IReadOnlyList<string> GetFilePaths(string path, bool clearCache)
{
if (clearCache && _filePathCache.TryRemove(path, out var cached))
{
Interlocked.Add(ref _recordCount, -(cached.Count + 1));
}
DropCacheIfIdleOrFull();
var filePaths = _filePathCache.GetOrAdd(
path,
static (p, state) =>
{
List<string> filePaths;
try
{
filePaths = state.FileSystem.GetFilePaths(p).OrderBy(x => x).ToList();
}
catch (DirectoryNotFoundException)
{
filePaths = [];
}
Interlocked.Add(ref state.Service._recordCount, filePaths.Count + 1);
return filePaths;
},
(FileSystem: _fileSystem, Service: this));
return filePaths;
}
public void Invalidate(string path)
{
Forget(path);
var parent = Path.GetDirectoryName(path);
if (!string.IsNullOrEmpty(parent))
{
Forget(parent);
}
}
public void Move(string source, string destination)
{
Directory.Move(source, destination);
Invalidate(source);
Invalidate(destination);
}
public bool IsAccessible(string path)
{
return _fileSystem.GetFileSystemEntryPaths(path).Any();
}
private void DropCacheIfIdleOrFull()
{
var nowMs = Environment.TickCount64;
var idleMs = nowMs - _lastAccess;
if (idleMs >= IdleTimeoutMs || _recordCount >= MaxCachedRecords)
{
_cache.Clear();
_fileCache.Clear();
_filePathCache.Clear();
_recordCount = 0;
_lastAccess = nowMs;
return;
}
if (idleMs >= AccessIntervalMs)
{
_lastAccess = nowMs;
}
}
private void Forget(string path)
{
if (_cache.TryRemove(path, out var entries))
{
Interlocked.Add(ref _recordCount, -(entries.Length + 1));
}
if (_fileCache.TryRemove(path, out _))
{
Interlocked.Decrement(ref _recordCount);
}
if (_filePathCache.TryRemove(path, out var filePaths))
{
Interlocked.Add(ref _recordCount, -(filePaths.Count + 1));
}
}
}
}
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