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using System;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Edmicro.Core.Caching;
using Microsoft.Extensions.Caching.Distributed;
using Microsoft.Extensions.Options;
namespace DistributedCache.DistributedCacheFile
{
/// <summary>
///
/// </summary>
public class DistributedCache : IDistributedCache
{
private readonly DistributedCacheFileConfig _config;
private string GetPathFileByKey(string key)
{
string pathFile = Path.Combine(_config.DirectoryCache, key);
return pathFile;
}
/// <summary>
///
/// </summary>
public DistributedCache(IOptions<DistributedCacheFileConfig> options)
{
_config = new DistributedCacheFileConfig
{
DirectoryCache = "cache"
};
if (options != null && options.Value != null)
{
_config = options.Value;
}
DistributedCacheHeplers.CreateDirectoryIfMissing(_config.DirectoryCache);
}
private void SetFolder(string cacheKey)
{
var listStr = cacheKey.Replace("//", "/").Replace("/", "\\").Split("\\").ToList();
string folderPath = string.Join("\\", listStr.SkipLast(1));
folderPath = Path.Combine(_config.DirectoryCache, folderPath);
DistributedCacheHeplers.CreateDirectoryIfMissing(folderPath);
}
/// <summary>
///
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public byte[] Get(string key)
{
var objCache = GetDataCache(key);
if (objCache != null)
{
return objCache.data;
}
return null;
}
/// <summary>
///
/// </summary>
/// <param name="key"></param>
/// <param name="token"></param>
/// <returns></returns>
public async Task<byte[]> GetAsync(string key, CancellationToken token = default)
{
var objCache = await GetDataCacheAsync(key);
if (objCache != null)
{
return objCache.data;
}
return null;
}
private DataCache GetDataCache(string key)
{
var pathFile = GetPathFileByKey(key);
if (File.Exists(pathFile))
{
var strJson = ReadJson(pathFile);
if (!string.IsNullOrWhiteSpace(strJson))
{
var objCache = DistributedCacheHeplers.DeserializeObjectCheckFormat<DataCache>(strJson);
if (objCache != null && objCache.isExpiration())
{
Remove(key);
return null;
}
return objCache;
}
else
{
Remove(key);
}
}
return null;
}
private string ReadJson(string pathFile)
{
string fileContents;
var fileInfo = new FileInfo(pathFile);
using (var fs = fileInfo.Open(FileMode.Open, FileAccess.Read, FileShare.Read))
{
using (StreamReader reader = new StreamReader(fs))
{
fileContents = reader.ReadToEnd();
}
}
return fileContents;
}
private async Task<DataCache> GetDataCacheAsync(string key)
{
var pathFile = GetPathFileByKey(key);
if (File.Exists(pathFile))
{
var strJson = await ReadJsonAsync(pathFile);
if (!string.IsNullOrWhiteSpace(strJson))
{
var objCache = DistributedCacheHeplers.DeserializeObjectCheckFormat<DataCache>(strJson);
if (objCache != null && objCache.isExpiration())
{
await RemoveAsync(key);
return null;
}
return objCache;
}
else
{
await RemoveAsync(key);
}
}
return null;
}
private async Task<string> ReadJsonAsync(string pathFile)
{
string fileContents;
var fileInfo = new FileInfo(pathFile);
using (var fs = fileInfo.Open(FileMode.Open, FileAccess.Read, FileShare.Read))
{
using (StreamReader reader = new StreamReader(fs))
{
fileContents = await reader.ReadToEndAsync();
}
}
return fileContents;
}
/// <summary>
///
/// </summary>
/// <param name="key"></param>
public void Refresh(string key)
{
var objCache = GetDataCache(key);
if (objCache != null)
{
var pathFile = GetPathFileByKey(key);
objCache.Refresh();
WriteFile(pathFile, objCache);
}
}
private void WriteFile(string pathFile, DataCache data)
{
var strJson = System.Text.Json.JsonSerializer.Serialize(data);
File.WriteAllText(pathFile, strJson, System.Text.Encoding.UTF8);
}
/// <summary>
///
/// </summary>
/// <param name="key"></param>
/// <param name="token"></param>
/// <returns></returns>
public async Task RefreshAsync(string key, CancellationToken token = default)
{
var objCache = await GetDataCacheAsync(key);
if (objCache != null)
{
var pathFile = GetPathFileByKey(key);
objCache.Refresh();
await WriteFileAsync(pathFile, objCache);
}
}
private Task WriteFileAsync(string pathFile, DataCache data)
{
var strJson = System.Text.Json.JsonSerializer.Serialize(data);
return File.WriteAllTextAsync(pathFile, strJson, System.Text.Encoding.UTF8);
}
/// <summary>
///
/// </summary>
/// <param name="key"></param>
public void Remove(string key)
{
var pathFile = GetPathFileByKey(key);
File.Delete(pathFile);
}
/// <summary>
///
/// </summary>
/// <param name="key"></param>
/// <param name="token"></param>
/// <returns></returns>
public Task RemoveAsync(string key, CancellationToken token = default)
{
Remove(key);
return Task.FromResult(1);
}
/// <summary>
///
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
/// <param name="options"></param>
public void Set(string key, byte[] value, DistributedCacheEntryOptions options) => Set(key, value, options.AbsoluteExpirationRelativeToNow);
/// <summary>
///
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
/// <param name="AbsoluteExpirationRelativeToNow"></param>
public void Set(string key, byte[] value, TimeSpan? AbsoluteExpirationRelativeToNow)
{
if (!string.IsNullOrWhiteSpace(key) && value != null)
{
SetFolder(key);
var pathFile = GetPathFileByKey(key);
if (AbsoluteExpirationRelativeToNow == null)
{
AbsoluteExpirationRelativeToNow = TimeSpan.FromHours(1);
}
var data = new DataCache(key, value, AbsoluteExpirationRelativeToNow.Value);
WriteFile(pathFile, data);
}
}
/// <summary>
///
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
/// <param name="options"></param>
/// <param name="token"></param>
/// <returns></returns>
public Task SetAsync(string key, byte[] value, DistributedCacheEntryOptions options, CancellationToken token = default) => SetAsync(key, value, options.AbsoluteExpirationRelativeToNow);
/// <summary>
///
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
/// <param name="AbsoluteExpirationRelativeToNow"></param>
/// <returns></returns>
public async Task SetAsync(string key, byte[] value, TimeSpan? AbsoluteExpirationRelativeToNow)
{
if (!string.IsNullOrWhiteSpace(key) && value != null)
{
var pathFile = GetPathFileByKey(key);
if (AbsoluteExpirationRelativeToNow == null)
{
AbsoluteExpirationRelativeToNow = TimeSpan.FromHours(1);
}
var data = new DataCache(key, value, AbsoluteExpirationRelativeToNow.Value);
await WriteFileAsync(pathFile, data);
}
}
}
}