private static void UpdateCacheSingle(NConfigRootReplacement rootReplacement, object cache, string configPath)
{
var cacheAcessor = new ReflectionAccessor(cache);
lock (cacheAcessor.GetField("_lock"))
{
var entries = cacheAcessor.GetField("_entries") as IEnumerable ?? Enumerable.Empty <object>();
// Get all site specific configuration records keys for internal cache.
// cache "entries" is a HashTable, so just iterate through
foreach (DictionaryEntry entry in entries)
{
var keyAccessor = new ReflectionAccessor(entry.Key);
// Only configuration cache entries replaced.
if (!keyAccessor.GetProperty("Key").ToString().StartsWith(configPath))
{
continue;
}
// Key and Value is the same object in the configuration cache entry.
var entryValueAccesor = new ReflectionAccessor(keyAccessor.GetField("_value"));
var runtimeConfigAccessor = new ReflectionAccessor(entryValueAccesor.GetField("_runtimeConfig"));
IInternalConfigRecord replacingRecord =
rootReplacement.CreateConfigRecord(runtimeConfigAccessor.GetField <IInternalConfigRecord>("_configRecord"));
runtimeConfigAccessor.SetField("_configRecord", replacingRecord);
runtimeConfigAccessor.SetField("_runtimeConfigLKG", null);
}
}
}
private static void UpdateCacheMultiple(NConfigRootReplacement rootReplacement, string configPath, object cacheInternal)
{
var cacheMultiple = new ReflectionAccessor(cacheInternal);
var caches = cacheMultiple.GetField("_caches") as IEnumerable ?? Enumerable.Empty <object>();
foreach (var cache in caches)
{
// Caches stored in array ala hash, so there are could be gaps.
if (cache == null)
{
continue;
}
UpdateCacheSingle(rootReplacement, cache, configPath);
}
//Private field from System.Web.Caching.CacheMultiple used to be called _caches but can also be called _cachesRefs
var cacheRefs = cacheMultiple.GetField("_cachesRefs") as IEnumerable ?? Enumerable.Empty <object>();
foreach (var cacheRef in cacheRefs)
{
if (cacheRef == null)
{
continue;
}
var cacheAcessor = new ReflectionAccessor(cacheRef);
var cache = cacheAcessor.GetProperty("Target");
if (cache != null)
{
UpdateCacheSingle(rootReplacement, cache, configPath);
}
}
}
public virtual void RestoreSystemConfiguration()
{
if (OriginalConfiguration == null)
{
return;
}
var configManager = new ReflectionAccessor(typeof(ConfigurationManager));
configManager.SetField("s_configSystem", OriginalConfiguration);
OriginalConfiguration = null;
}
public override void SubstituteSystemConfiguration(IConfigurationFactory factory, IList <string> fileNames)
{
if (OriginalConfiguration != null)
{
throw new InvalidOperationException("Web system default configuration already substituted.");
}
IInternalConfigSystem originalConfigSystem = SubstituteConfigurationSystem(factory, fileNames);
// Web Part (10 level black magic starts here)
var httpConfigurationSystem = new ReflectionAccessor(originalConfigSystem.GetType());
// Get original values.
var configSystem = httpConfigurationSystem.GetField <IConfigSystem>("s_configSystem");
var replacingSystem = new NConfigSystemReplacement(configSystem, factory, fileNames);
// Substitute to decorated instances.
httpConfigurationSystem.SetField("s_configSystem", replacingSystem);
httpConfigurationSystem.SetField("s_configRoot", replacingSystem.Root);
// Refill system cache with new decorated records.
var systemWebAss = httpConfigurationSystem.AccessedType.Assembly;
var hostingEnviroment = new ReflectionAccessor(systemWebAss.GetType("System.Web.Hosting.HostingEnvironment"));
string siteId = hostingEnviroment.GetProperty <string>("SiteID");
string configPath = "dmachine/webroot/" + siteId;
var httpRuntime = new ReflectionAccessor(systemWebAss.GetType("System.Web.HttpRuntime"));
try
{
object cacheInternal = httpRuntime.GetProperty("CacheInternal");
var rootReplacement = replacingSystem.Root as NConfigRootReplacement;
// In case of single CPU internal caching uses CacheSingle.
if (cacheInternal.GetType().Name == "CacheSingle")
{
UpdateCacheSingle(rootReplacement, cacheInternal, configPath);
}
else
{
UpdateCacheMultiple(rootReplacement, configPath, cacheInternal);
}
}
catch (NullReferenceException)
{
// There is no CacheInternal in .Net 4.7.2
}
OriginalConfiguration = originalConfigSystem;
}
protected static IInternalConfigSystem SubstituteConfigurationSystem(IConfigurationFactory factory, IList <string> fileNames)
{
var configManager = new ReflectionAccessor(typeof(ConfigurationManager));
ConfigurationManager.GetSection("appSettings"); // This will init Configuration manager internal config system.
var originalConfigSystem = configManager.GetField <IInternalConfigSystem>("s_configSystem");
NSystemReplacementConfiguration replacementConfigSytem = factory.CreateSystemReplacementConfiguration(originalConfigSystem, fileNames);
configManager.SetField("s_configSystem", replacementConfigSytem);
return(originalConfigSystem);
}
private static void UpdateCacheMultiple(NConfigRootReplacement rootReplacement, string configPath, object cacheInternal)
{
var cacheMultiple = new ReflectionAccessor(cacheInternal);
var caches = cacheMultiple.GetField("_caches") as IEnumerable ?? Enumerable.Empty <object>();
foreach (var cache in caches)
{
// Caches stored in array ala hash, so there are could be gaps.
if (cache == null)
{
continue;
}
UpdateCacheSingle(rootReplacement, cache, configPath);
}
}
public override void SubstituteSystemConfiguration(IConfigurationFactory factory, IList <string> fileNames)
{
if (OriginalConfiguration != null)
{
throw new InvalidOperationException("Web system default configuration already substituted.");
}
IInternalConfigSystem originalConfigSystem = SubstituteConfigurationSystem(factory, fileNames);
// Web Part (10 level black magic starts here)
var httpConfigurationSystem = new ReflectionAccessor(originalConfigSystem.GetType());
// Get original values.
var configSystem = httpConfigurationSystem.GetField <IConfigSystem>("s_configSystem");
var replacingSystem = new NConfigSystemReplacement(configSystem, factory, fileNames);
// Substitute to decorated instances.
httpConfigurationSystem.SetField("s_configSystem", replacingSystem);
httpConfigurationSystem.SetField("s_configRoot", replacingSystem.Root);
// Refill system cache with new decorated records.
var systemWebAss = httpConfigurationSystem.AccessedType.Assembly;
var hostingEnviroment = new ReflectionAccessor(systemWebAss.GetType("System.Web.Hosting.HostingEnvironment"));
string siteId = hostingEnviroment.GetProperty <string>("SiteID");
string configPath = "dmachine/webroot/" + siteId;
var httpRuntime = new ReflectionAccessor(systemWebAss.GetType("System.Web.HttpRuntime"));
var internalCache = new ReflectionAccessor(httpRuntime.GetProperty("CacheInternal"));
var caches = internalCache.GetField("_caches") as IEnumerable ?? Enumerable.Empty <object>();
// Get all site specific configuration records keys for internal cache.
var rootReplacement = replacingSystem.Root as NConfigRootReplacement;
foreach (var cache in caches)
{
// Caches stored in array ala hash, so there is could be gaps.
if (cache == null)
{
continue;
}
var cacheAcessor = new ReflectionAccessor(cache);
lock (cacheAcessor.GetField("_lock"))
{
var entries = cacheAcessor.GetField("_entries") as IEnumerable ?? Enumerable.Empty <object>();
// entries is HashTable, so just iterate through
foreach (DictionaryEntry entry in entries)
{
var keyAccessor = new ReflectionAccessor(entry.Key);
// Only configuration cache entries replaced.
if (!keyAccessor.GetProperty("Key").ToString().StartsWith(configPath))
{
continue;
}
// Key and Value is the same object in the configuration cache entry.
var entryValueAccesor = new ReflectionAccessor(keyAccessor.GetField("_value"));
var runtimeConfigAccessor = new ReflectionAccessor(entryValueAccesor.GetField("_runtimeConfig"));
IInternalConfigRecord replacingRecord = rootReplacement.CreateConfigRecord(runtimeConfigAccessor.GetField <IInternalConfigRecord>("_configRecord"));
runtimeConfigAccessor.SetField("_configRecord", replacingRecord);
runtimeConfigAccessor.SetField("_runtimeConfigLKG", null);
}
}
}
OriginalConfiguration = originalConfigSystem;
}
