Gary Sharp
438 lines
17 KiB
C#
438 lines
17 KiB
C#
using Disco.Data.Repository;
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using Disco.Models.Repository;
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using Newtonsoft.Json;
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using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace Disco.Data.Configuration
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{
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using ConfigurationCacheItemType = Tuple<ConfigurationItem, object>;
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using ConfigurationCacheScopeType = ConcurrentDictionary<string, Tuple<ConfigurationItem, object>>;
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using ConfigurationCacheType = ConcurrentDictionary<string, ConcurrentDictionary<string, Tuple<ConfigurationItem, object>>>;
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internal static class ConfigurationCache
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{
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#region Cache
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private static ConfigurationCacheType cacheStore = null;
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private static object configChangeLock = new object();
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private static ConfigurationCacheType Cache(DiscoDataContext Database)
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{
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if (ConfigurationCache.cacheStore == null)
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{
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lock (configChangeLock)
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{
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if (ConfigurationCache.cacheStore == null)
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{
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if (Database == null)
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throw new InvalidOperationException("The Configuration must be loaded at least once before a Cache-Only Configuration Context is used");
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var configurationItems = Database.ConfigurationItems.ToArray();
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var indexedItems = configurationItems
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.GroupBy(ci => ci.Scope)
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.Select(g =>
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new KeyValuePair<string, ConfigurationCacheScopeType>(
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g.Key,
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new ConfigurationCacheScopeType(
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g.Select(i => new KeyValuePair<string, ConfigurationCacheItemType>(i.Key, Tuple.Create(i, (object)null))))));
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cacheStore = new ConfigurationCacheType(indexedItems);
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}
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}
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}
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return ConfigurationCache.cacheStore;
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}
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private static ConfigurationCacheItemType CacheGetItem(DiscoDataContext Database, string Scope, string Key)
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{
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var cache = Cache(Database);
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ConfigurationCacheScopeType scopeCache;
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if (cache.TryGetValue(Scope, out scopeCache))
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{
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ConfigurationCacheItemType item = default(ConfigurationCacheItemType);
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if (scopeCache.TryGetValue(Key, out item))
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return item;
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}
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return null;
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}
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private static ConfigurationCacheItemType CacheSetItem(DiscoDataContext Database, string Scope, string Key, string Value, object ObjectValue)
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{
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if (Database == null)
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throw new InvalidOperationException("Cannot save changes with a Cache-Only Configuration Context");
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var item = CacheGetItem(Database, Scope, Key);
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if (item == null && Value == null)
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{
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// No Change - already null
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return null;
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}
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else if (item == null)
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{
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// New Configuration Item
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lock (configChangeLock)
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{
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// Check again for thread safety
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item = CacheGetItem(Database, Scope, Key);
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if (item == null)
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{
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// Create Configuration Item
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var configItem = new ConfigurationItem() { Scope = Scope, Key = Key, Value = Value };
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item = new ConfigurationCacheItemType(configItem, ObjectValue);
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// Add Item to DB
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Database.ConfigurationItems.Add(configItem);
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// Add Item to Cache
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ConfigurationCacheScopeType scopeCache;
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if (!cacheStore.TryGetValue(Scope, out scopeCache))
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{
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scopeCache = new ConfigurationCacheScopeType();
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cacheStore.TryAdd(Scope, scopeCache);
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}
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scopeCache.TryAdd(Key, item);
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return item;
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}
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}
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}
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if (item != null)
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{
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// Existing Configuration Item
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lock (configChangeLock)
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{
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var configItem = item.Item1;
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// Compare Values
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if (item.Item1.Value == Value)
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{
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// No Change - Update Cache Reference Only
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return SetItemTypeValue(item, ObjectValue);
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}
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else
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{
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var entityInfo = Database.Entry(configItem);
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if (entityInfo.State == System.Data.EntityState.Detached)
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{
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// Reload Item from DB
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configItem = Database.ConfigurationItems.Where(i => i.Scope == Scope && i.Key == Key).First();
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}
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if (Value == null)
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{
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// Remove item from Database
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Database.ConfigurationItems.Remove(configItem);
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// Remove item from Cache
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ConfigurationCacheScopeType scopeCache;
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if (cacheStore.TryGetValue(Scope, out scopeCache))
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{
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scopeCache.TryRemove(Key, out item);
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}
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return null;
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}
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else
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{
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// Update Database
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configItem.Value = Value;
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// Update Cache
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ConfigurationCacheScopeType scopeCache;
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if (cacheStore.TryGetValue(Scope, out scopeCache))
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{
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scopeCache.TryRemove(Key, out item);
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item = new ConfigurationCacheItemType(configItem, ObjectValue);
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scopeCache.TryAdd(Key, item);
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return item;
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}
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}
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}
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}
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}
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return null;
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}
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private static ConfigurationCacheItemType SetItemTypeValue(ConfigurationCacheItemType ExistingItem, object Value)
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{
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var cache = ConfigurationCache.cacheStore;
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ConfigurationCacheScopeType scopeCache;
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if (cache.TryGetValue(ExistingItem.Item1.Scope, out scopeCache))
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{
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ConfigurationCacheItemType newItem = new ConfigurationCacheItemType(ExistingItem.Item1, Value);
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scopeCache.TryUpdate(ExistingItem.Item1.Key, newItem, ExistingItem);
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return newItem;
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}
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return null;
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}
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#endregion
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#region Helpers
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private static bool IsConvertableFromString(Type t)
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{
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if (t == typeof(Boolean) ||
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t == typeof(Char) ||
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t == typeof(SByte) ||
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t == typeof(Byte) ||
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t == typeof(Int16) || t == typeof(UInt16) ||
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t == typeof(Int32) || t == typeof(UInt32) ||
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t == typeof(Int64) || t == typeof(UInt64) ||
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t == typeof(Single) ||
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t == typeof(Double) ||
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t == typeof(Decimal) ||
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t == typeof(DateTime) ||
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t == typeof(String))
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return true;
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else
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return false;
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}
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#endregion
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#region Cache Getters/Setters
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internal static class Helpers<T>
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{
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private static readonly IEqualityComparer<T> comparer = EqualityComparer<T>.Default;
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internal static T GetValue(DiscoDataContext Database, string Scope, string Key, T Default)
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{
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var item = CacheGetItem(Database, Scope, Key);
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if (item == null)
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return Default;
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else
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{
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if (item.Item2 != null && item.Item2.GetType() == typeof(T))
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{
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// Return Cached Item
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return (T)item.Item2;
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}
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else
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{
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// Convert Serialized Item
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Type itemType = typeof(T);
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object itemValue;
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if (itemType == typeof(string))
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{
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// string
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itemValue = item.Item1.Value;
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}
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else if (itemType == typeof(object))
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{
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// object
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itemValue = item.Item1.Value;
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}
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else if (IsConvertableFromString(itemType))
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{
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// IConvertable
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itemValue = Convert.ChangeType(item.Item1.Value, itemType);
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}
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else if (itemType.BaseType != null && itemType.BaseType == typeof(Enum))
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{
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// enum
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itemValue = Enum.Parse(typeof(T), item.Item1.Value);
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}
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else if (itemType.IsGenericType &&
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itemType.GetGenericTypeDefinition() == typeof(Nullable<>) &&
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IsConvertableFromString(Nullable.GetUnderlyingType(itemType)))
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{
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// nullable
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itemValue = (T)Convert.ChangeType(item.Item1.Value, Nullable.GetUnderlyingType(itemType));
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}
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else if (itemType == typeof(Guid))
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{
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// guid
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itemValue = new Guid(item.Item1.Value);
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}
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else if (itemType == typeof(Guid?))
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{
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// guid
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if (string.IsNullOrEmpty(item.Item1.Value))
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itemValue = null;
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else
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itemValue = new Guid(item.Item1.Value);
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}
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else if (itemType == typeof(byte[]))
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{
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// byte[]
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itemValue = Convert.FromBase64String(item.Item1.Value);
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}
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else
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{
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// JSON Deserialize
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itemValue = JsonConvert.DeserializeObject<T>(item.Item1.Value);
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}
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// Set Item in Cache
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SetItemTypeValue(item, itemValue);
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return (T)itemValue;
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}
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}
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}
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internal static void SetValue(DiscoDataContext Database, string Scope, string Key, T Value)
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{
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Type valueType = typeof(T);
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string stringValue;
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if (comparer.Equals(Value, default(T)))
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{
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stringValue = null;
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}
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else if (valueType == typeof(object))
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{
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throw new ArgumentException($"Cannot serialize the configuration item [{Scope}].[{Key}] which has the type [System.Object]", "Value");
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}
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else if (IsConvertableFromString(valueType))
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{
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// string or supports IConvertable
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stringValue = Value.ToString();
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}
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else if (valueType.BaseType != null && valueType.BaseType == typeof(Enum))
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{
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// enum
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stringValue = Value.ToString();
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}
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else if (valueType.IsGenericType &&
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valueType.GetGenericTypeDefinition() == typeof(Nullable<>) &&
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IsConvertableFromString(Nullable.GetUnderlyingType(valueType)))
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{
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// nullable
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stringValue = Value.ToString();
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}
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else if (valueType == typeof(Guid) || valueType == typeof(Guid?))
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{
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stringValue = Value.ToString();
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}
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else if (Value is byte[] valueBytes)
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{
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// byte[]
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stringValue = Convert.ToBase64String(valueBytes);
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}
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else
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{
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// JSON Serialize
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stringValue = JsonConvert.SerializeObject(Value);
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}
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CacheSetItem(Database, Scope, Key, stringValue, Value);
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}
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}
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#endregion
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#region Cache Helpers
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internal static IEnumerable<string> GetScopeKeys(DiscoDataContext Database, string Scope)
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{
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var cache = Cache(Database);
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ConfigurationCacheScopeType scopeCache;
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if (cache.TryGetValue(Scope, out scopeCache))
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{
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return scopeCache.Keys.ToList();
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}
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else
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{
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return Enumerable.Empty<string>();
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}
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}
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internal static void RemoveScope(DiscoDataContext Database, string Scope)
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{
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if (Database == null)
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throw new InvalidOperationException("Cannot save changes with a Cache-Only Configuration Context");
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lock (configChangeLock)
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{
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// Remove item from Database
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var items = Database.ConfigurationItems.Where(i => i.Scope == Scope).ToList();
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items.ForEach(i => Database.ConfigurationItems.Remove(i));
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// Remove item from Cache
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if (cacheStore != null)
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{
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ConfigurationCacheScopeType scopeCache;
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cacheStore.TryRemove(Scope, out scopeCache);
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}
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}
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}
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internal static void RemoveScopeKey(DiscoDataContext Database, string Scope, string Key)
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{
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if (Database == null)
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throw new InvalidOperationException("Cannot save changes with a Cache-Only Configuration Context");
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lock (configChangeLock)
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{
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var cacheItem = CacheGetItem(Database, Scope, Key);
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ConfigurationItem configItem = null;
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// Remove item from Database
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if (cacheItem != null)
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{
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configItem = cacheItem.Item1;
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var entityInfo = Database.Entry(configItem);
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if (entityInfo.State == System.Data.EntityState.Detached)
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{
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// Reload Item from DB
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configItem = Database.ConfigurationItems.Where(i => i.Scope == Scope && i.Key == Key).FirstOrDefault();
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}
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}
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if (configItem == null)
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{
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// Load Item from DB
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configItem = Database.ConfigurationItems.Where(i => i.Scope == Scope && i.Key == Key).FirstOrDefault();
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}
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if (configItem != null)
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{
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Database.ConfigurationItems.Remove(configItem);
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}
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// Remove item from Cache
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if (cacheItem != null)
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{
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ConfigurationCacheScopeType scopeCache;
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if (cacheStore.TryGetValue(Scope, out scopeCache))
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{
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scopeCache.TryRemove(Key, out cacheItem);
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}
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}
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}
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}
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#endregion
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#region Obsfucation Helpers
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internal static string Obsfucate(this string Value)
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{
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if (string.IsNullOrEmpty(Value))
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return Value;
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else
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return Convert.ToBase64String(Encoding.Unicode.GetBytes(Value));
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}
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internal static string Deobsfucate(this string ObsfucatedValue)
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{
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if (string.IsNullOrEmpty(ObsfucatedValue))
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return ObsfucatedValue;
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else
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return Encoding.Unicode.GetString(Convert.FromBase64String(ObsfucatedValue));
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}
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#endregion
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}
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}
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