IW4M-Admin/Application/IO/BaseConfigurationHandlerV2.cs

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C#
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using System;
using System.Collections;
using System.IO;
using System.Linq;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using SharedLibraryCore;
using SharedLibraryCore.Interfaces;
namespace IW4MAdmin.Application.IO;
public class BaseConfigurationHandlerV2<TConfigurationType> : IConfigurationHandlerV2<TConfigurationType>
where TConfigurationType : class
{
private readonly ILogger<BaseConfigurationHandlerV2<TConfigurationType>> _logger;
private readonly ConfigurationWatcher _watcher;
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private readonly JsonSerializerOptions _serializerOptions = new()
{
WriteIndented = true,
Converters =
{
new JsonStringEnumConverter()
},
Encoder = System.Text.Encodings.Web.JavaScriptEncoder.UnsafeRelaxedJsonEscaping
};
private readonly SemaphoreSlim _onIo = new(1, 1);
private TConfigurationType _configurationInstance;
private string _path = string.Empty;
private event Action<string> FileUpdated;
public BaseConfigurationHandlerV2(ILogger<BaseConfigurationHandlerV2<TConfigurationType>> logger,
ConfigurationWatcher watcher)
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{
_logger = logger;
_watcher = watcher;
FileUpdated += OnFileUpdated;
}
~BaseConfigurationHandlerV2()
{
FileUpdated -= OnFileUpdated;
_watcher.Unregister(_path);
}
public async Task<TConfigurationType> Get(string configurationName,
TConfigurationType defaultConfiguration = default)
{
if (string.IsNullOrWhiteSpace(configurationName))
{
return defaultConfiguration;
}
var cleanName = configurationName.Replace("\\", "").Replace("/", "");
if (string.IsNullOrWhiteSpace(configurationName))
{
return defaultConfiguration;
}
_path = Path.Join(Utilities.OperatingDirectory, "Configuration", $"{cleanName}.json");
TConfigurationType readConfiguration = null;
try
{
await _onIo.WaitAsync();
await using var fileStream = File.OpenRead(_path);
readConfiguration =
await JsonSerializer.DeserializeAsync<TConfigurationType>(fileStream, _serializerOptions);
await fileStream.DisposeAsync();
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_watcher.Register(_path, FileUpdated);
if (readConfiguration is null)
{
_logger.LogError("Could not parse configuration {Type} at {FileName}", typeof(TConfigurationType).Name,
_path);
return defaultConfiguration;
}
}
catch (FileNotFoundException)
{
if (defaultConfiguration is not null)
{
await InternalSet(defaultConfiguration, false);
}
}
catch (Exception ex)
{
_logger.LogError(ex, "Could not read configuration file at {Path}", _path);
return defaultConfiguration;
}
finally
{
if (_onIo.CurrentCount == 0)
{
_onIo.Release(1);
}
}
return _configurationInstance ??= readConfiguration;
}
public async Task Set(TConfigurationType configuration)
{
await InternalSet(configuration, true);
}
public async Task Set()
{
if (_configurationInstance is not null)
{
await InternalSet(_configurationInstance, true);
}
}
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private async Task InternalSet(TConfigurationType configuration, bool awaitSemaphore)
{
try
{
if (awaitSemaphore)
{
await _onIo.WaitAsync();
}
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await using var fileStream = File.OpenWrite(_path);
await JsonSerializer.SerializeAsync(fileStream, configuration, _serializerOptions);
await fileStream.DisposeAsync();
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_configurationInstance = configuration;
}
catch (Exception ex)
{
_logger.LogError(ex, "Could not save configuration {Type} {Path}", configuration.GetType().Name, _path);
}
finally
{
if (awaitSemaphore && _onIo.CurrentCount == 0)
{
_onIo.Release(1);
}
}
}
private async void OnFileUpdated(string filePath)
{
try
{
await _onIo.WaitAsync();
await using var fileStream = File.OpenRead(_path);
var readConfiguration =
await JsonSerializer.DeserializeAsync<TConfigurationType>(fileStream, _serializerOptions);
await fileStream.DisposeAsync();
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if (readConfiguration is null)
{
_logger.LogWarning("Could not parse updated configuration {Type} at {Path}",
typeof(TConfigurationType).Name, filePath);
}
else
{
CopyUpdatedProperties(readConfiguration);
}
}
catch (Exception ex)
{
_logger.LogWarning(ex, "Could not parse updated configuration {Type} at {Path}",
typeof(TConfigurationType).Name, filePath);
}
finally
{
if (_onIo.CurrentCount == 0)
{
_onIo.Release(1);
}
}
}
private void CopyUpdatedProperties(TConfigurationType newConfiguration)
{
if (_configurationInstance is null)
{
_configurationInstance = newConfiguration;
return;
}
_logger.LogDebug("Updating existing config with new values {Type} at {Path}", typeof(TConfigurationType).Name,
_path);
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if (_configurationInstance is IDictionary configDict && newConfiguration is IDictionary newConfigDict)
{
configDict.Clear();
foreach (var key in newConfigDict.Keys)
{
configDict.Add(key, newConfigDict[key]);
}
}
else
{
foreach (var property in _configurationInstance.GetType().GetProperties()
.Where(prop => prop.CanRead && prop.CanWrite))
{
property.SetValue(_configurationInstance, property.GetValue(newConfiguration));
}
}
}
}