private void LoadXPathDocument()
{
Debug.Assert(_xpathDocument == null && _document == null && _xpathNavigator == null);
if (!String.IsNullOrEmpty(_documentContent))
{
_xpathDocument = XmlUtils.CreateXPathDocumentFromContent(_documentContent);
return;
}
if (String.IsNullOrEmpty(_documentSource))
{
return;
}
// First, figure out if it's a physical or virtual path
VirtualPath virtualPath;
string physicalPath;
ResolvePhysicalOrVirtualPath(_documentSource, out virtualPath, out physicalPath);
CacheStoreProvider cacheInternal = HttpRuntime.Cache.InternalCache;
string key = CacheInternal.PrefixLoadXPath + ((physicalPath != null) ?
physicalPath : virtualPath.VirtualPathString);
_xpathDocument = (XPathDocument)cacheInternal.Get(key);
if (_xpathDocument == null)
{
Debug.Trace("XmlControl", "XPathDocument not found in cache (" + _documentSource + ")");
// Get the stream, and open the doc
CacheDependency dependency;
using (Stream stream = OpenFileAndGetDependency(virtualPath, physicalPath, out dependency)) {
// The same comments as in LoadTransformFromSource() (VSWhidbey 545322, 546662)
if (physicalPath == null)
{
physicalPath = virtualPath.MapPath();
}
_xpathDocument = new XPathDocument(XmlUtils.CreateXmlReader(stream, physicalPath));
}
// Cache it, but only if we got a dependency
if (dependency != null)
{
using (dependency) {
cacheInternal.Insert(key, _xpathDocument, new CacheInsertOptions()
{
Dependencies = dependency
});
}
}
}
else
{
Debug.Trace("XmlControl", "XPathDocument found in cache (" + _documentSource + ")");
}
}
/// <devdoc>
/// Gets the ad data for the given file by loading the file, or reading from the
/// application-level cache.
/// </devdoc>
private AdRec [] GetFileData(string fileName)
{
// VSWhidbey 208626: Adopting similar code from xml.cs to support virtual path provider
// First, figure out if it's a physical or virtual path
VirtualPath virtualPath;
string physicalPath;
ResolvePhysicalOrVirtualPath(fileName, out virtualPath, out physicalPath);
// try to get it from the ASP.NET cache
string fileKey = CacheInternal.PrefixAdRotator + ((!String.IsNullOrEmpty(physicalPath)) ?
physicalPath : virtualPath.VirtualPathString);
CacheStoreProvider cacheInternal = System.Web.HttpRuntime.Cache.InternalCache;
AdRec[] adRecs = cacheInternal.Get(fileKey) as AdRec[];
if (adRecs == null)
{
// Otherwise load it
CacheDependency dependency;
try {
using (Stream stream = OpenFileAndGetDependency(virtualPath, physicalPath, out dependency)) {
adRecs = LoadStream(stream);
Debug.Assert(adRecs != null);
}
}
catch (Exception e) {
if (!String.IsNullOrEmpty(physicalPath) && HttpRuntime.HasPathDiscoveryPermission(physicalPath))
{
// We want to catch the error message, but not propage the inner exception. Otherwise we can throw up
// logon prompts through IE;
throw new HttpException(SR.GetString(SR.AdRotator_cant_open_file, ID, e.Message));
}
else
{
throw new HttpException(SR.GetString(SR.AdRotator_cant_open_file_no_permission, ID));
}
}
// Cache it, but only if we got a dependency
if (dependency != null)
{
using (dependency) {
// and store it in the cache, dependent on the file name
cacheInternal.Insert(fileKey, adRecs, new CacheInsertOptions()
{
Dependencies = dependency
});
}
}
}
return(adRecs);
}
internal /*public*/ void DoDelete(HttpContext context)
{
string key = CreateKey(context.Request);
CacheStoreProvider cacheInternal = HttpRuntime.Cache.InternalCache;
CachedContent content = (CachedContent)cacheInternal.Get(key);
/* If the item isn't there, we probably took too long to run. */
if (content == null)
{
ReportNotFound(context);
return;
}
int lockCookie;
if (!GetOptionalNonNegativeInt32HeaderValue(context, StateHeaders.LOCKCOOKIE_NAME, out lockCookie))
{
return;
}
content._spinLock.AcquireWriterLock();
try {
if (content._content == null)
{
ReportNotFound(context);
return;
}
/* Only remove the item if we are the owner */
if (content._locked && (lockCookie == -1 || content._lockCookie != lockCookie))
{
ReportLocked(context, content);
return;
}
/*
* If not locked, keep it locked until it is completely removed.
* Prevent overwriting when we drop the lock.
*/
content._locked = true;
content._lockCookie = 0;
}
finally {
content._spinLock.ReleaseWriterLock();
}
cacheInternal.Remove(key);
}
private void LoadXmlDocument()
{
Debug.Assert(_xpathDocument == null && _document == null && _xpathNavigator == null);
if (!String.IsNullOrEmpty(_documentContent))
{
_document = XmlUtils.CreateXmlDocumentFromContent(_documentContent);
return;
}
if (String.IsNullOrEmpty(_documentSource))
{
return;
}
// Make it absolute and check security
string physicalPath = MapPathSecure(_documentSource);
CacheStoreProvider cacheInternal = System.Web.HttpRuntime.Cache.InternalCache;
string key = CacheInternal.PrefixLoadXml + physicalPath;
_document = (XmlDocument)cacheInternal.Get(key);
if (_document == null)
{
Debug.Trace("XmlControl", "XmlDocument not found in cache (" + _documentSource + ")");
CacheDependency dependency;
using (Stream stream = OpenFileAndGetDependency(null, physicalPath, out dependency)) {
_document = new XmlDocument();
_document.Load(XmlUtils.CreateXmlReader(stream, physicalPath));
cacheInternal.Insert(key, _document, new CacheInsertOptions()
{
Dependencies = dependency
});
}
}
else
{
Debug.Trace("XmlControl", "XmlDocument found in cache (" + _documentSource + ")");
}
//
lock (_document) {
// Always return a clone of the cached copy
_document = (XmlDocument)_document.CloneNode(true /*deep*/);
}
}
private void CacheBrowserCapResult(ref HttpCapabilitiesBase result)
{
// Use the previously cached browserCap object if an identical
// browserCap is found.
CacheStoreProvider cacheInternal = System.Web.HttpRuntime.Cache.InternalCache;
if (result.Capabilities == null)
{
return;
}
string hashKey = CacheInternal.PrefixBrowserCapsHash;
StringBuilder builder = new StringBuilder();
foreach (string attribute in result.Capabilities.Keys)
{
// Ignore useragent that is stored with empty key.
if (String.IsNullOrEmpty(attribute))
{
continue;
}
string value = (String)result.Capabilities[attribute];
if (value != null)
{
builder.Append(attribute);
builder.Append("$");
builder.Append(value);
builder.Append("$");
}
}
hashKey += builder.ToString().GetHashCode().ToString(CultureInfo.InvariantCulture);
HttpCapabilitiesBase newResult = cacheInternal.Get(hashKey) as HttpCapabilitiesBase;
if (newResult != null)
{
result = newResult;
}
else
{
// cache it and respect cachetime
cacheInternal.Insert(hashKey, result, new CacheInsertOptions()
{
SlidingExpiration = _cachetime
});
}
}
// Disallow Apartment components in when ASPCOMPAT is off
internal static void CheckThreadingModel(String progidDisplayName, Guid clsid)
{
if (IsInAspCompatMode)
{
return;
}
// try cache first
CacheStoreProvider cacheInternal = HttpRuntime.Cache.InternalCache;
String key = CacheInternal.PrefixAspCompatThreading + progidDisplayName;
String threadingModel = (String)cacheInternal.Get(key);
RegistryKey regKey = null;
if (threadingModel == null)
{
try {
regKey = Registry.ClassesRoot.OpenSubKey("CLSID\\{" + clsid + "}\\InprocServer32");
if (regKey != null)
{
threadingModel = (String)regKey.GetValue("ThreadingModel");
}
}
catch {
}
finally {
if (regKey != null)
{
regKey.Close();
}
}
if (threadingModel == null)
{
threadingModel = String.Empty;
}
cacheInternal.Insert(key, threadingModel, null);
}
if (StringUtil.EqualsIgnoreCase(threadingModel, "Apartment"))
{
throw new HttpException(
SR.GetString(SR.Apartment_component_not_allowed, progidDisplayName));
}
}
// Mark CachedPathData as completed when the first request for the path results in a
// status outside the 400 range. We need to mark all data up the path to account for
// virtual files.
static internal void MarkCompleted(CachedPathData pathData)
{
CacheStoreProvider cacheInternal = HttpRuntime.Cache.InternalCache;
string configPath = pathData._configPath;
do
{
pathData.CompletedFirstRequest = true;
configPath = ConfigPathUtility.GetParent(configPath);
if (configPath == null)
{
break;
}
string key = CreateKey(configPath);
pathData = (CachedPathData)cacheInternal.Get(key);
} while (pathData != null && !pathData.CompletedFirstRequest);
}
// Get the page-level IResourceProvider
internal static IResourceProvider GetLocalResourceProvider(VirtualPath virtualPath)
{
// If we have it cached, return it (it may be null if there are no local resources)
CacheStoreProvider cacheInternal = System.Web.HttpRuntime.Cache.InternalCache;
string cacheKey = CacheInternal.PrefixResourceProvider + virtualPath.VirtualPathString;
IResourceProvider resourceProvider = cacheInternal.Get(cacheKey) as IResourceProvider;
if (resourceProvider != null)
{
return(resourceProvider);
}
EnsureResourceProviderFactory();
resourceProvider = s_resourceProviderFactory.CreateLocalResourceProvider(virtualPath.VirtualPathString);
// Cache it
cacheInternal.Insert(cacheKey, resourceProvider, null);
return(resourceProvider);
}
// Remove an item. Note that the item is originally obtained by GetExclusive
// Same note as Set on lockId
public override void RemoveItem(HttpContext context,
String id,
object lockId,
SessionStateStoreData item)
{
Debug.Assert(lockId != null, "lockId != null");
string key = CreateSessionStateCacheKey(id);
CacheStoreProvider cacheInternal = HttpRuntime.Cache.InternalCache;
int lockCookie = (int)lockId;
SessionIDManager.CheckIdLength(id, true /* throwOnFail */);
InProcSessionState state = (InProcSessionState)cacheInternal.Get(key);
/* If the item isn't there, we probably took too long to run. */
if (state == null)
{
return;
}
state._spinLock.AcquireWriterLock();
try {
/* Only remove the item if we are the owner */
if (!state._locked || state._lockCookie != lockCookie)
{
return;
}
/* prevent overwriting when we drop the lock */
state._lockCookie = 0;
}
finally {
state._spinLock.ReleaseWriterLock();
}
cacheInternal.Remove(key);
TraceSessionStats();
}
// Remove CachedPathData when the first request for the path results in a
// 400 range error. We need to remove all data up the path to account for
// virtual files.
// An example of a 400 range error is "path not found".
static internal void RemoveBadPathData(CachedPathData pathData)
{
CacheStoreProvider cacheInternal = HttpRuntime.Cache.InternalCache;
string configPath = pathData._configPath;
string key = CreateKey(configPath);
while (pathData != null && !pathData.CompletedFirstRequest && !pathData.Exists)
{
cacheInternal.Remove(key);
configPath = ConfigPathUtility.GetParent(configPath);
if (configPath == null)
{
break;
}
key = CreateKey(configPath);
pathData = (CachedPathData)cacheInternal.Get(key);
}
}
private static IResourceProvider GetGlobalResourceProvider(string classKey)
{
string fullClassName = BaseResourcesBuildProvider.DefaultResourcesNamespace +
"." + classKey;
// If we have it cached, return it
CacheStoreProvider cacheInternal = System.Web.HttpRuntime.Cache.InternalCache;
string cacheKey = CacheInternal.PrefixResourceProvider + fullClassName;
IResourceProvider resourceProvider = cacheInternal.Get(cacheKey) as IResourceProvider;
if (resourceProvider != null)
{
return(resourceProvider);
}
EnsureResourceProviderFactory();
resourceProvider = s_resourceProviderFactory.CreateGlobalResourceProvider(classKey);
// Cache it
cacheInternal.Insert(cacheKey, resourceProvider, null);
return(resourceProvider);
}
// Example of configPath = "machine/webroot/1/fxtest/sub/foo.aspx"
// The configPath parameter must be lower case.
static private CachedPathData GetConfigPathData(string configPath)
{
Debug.Assert(ConfigPathUtility.IsValid(configPath), "ConfigPathUtility.IsValid(configPath)");
Debug.Assert(configPath == configPath.ToLower(CultureInfo.InvariantCulture), "configPath == configPath.ToLower(CultureInfo.InvariantCulture)");
bool exists = false;
bool isDirectory = false;
bool isRemovable = IsCachedPathDataRemovable(configPath);
// if the sliding expiration is zero, we won't cache it unless it is a configPath for root web.config or above
if (isRemovable && DoNotCacheUrlMetadata)
{
string pathSiteID = null;
VirtualPath virtualFilePath = null;
string physicalFilePath = null;
WebConfigurationHost.GetSiteIDAndVPathFromConfigPath(configPath, out pathSiteID, out virtualFilePath);
physicalFilePath = GetPhysicalPath(virtualFilePath);
string parentConfigPath = ConfigPathUtility.GetParent(configPath);
CachedPathData pathParentData = GetConfigPathData(parentConfigPath);
if (!String.IsNullOrEmpty(physicalFilePath))
{
FileUtil.PhysicalPathStatus(physicalFilePath, false, false, out exists, out isDirectory);
}
CachedPathData pathData = new CachedPathData(configPath, virtualFilePath, physicalFilePath, exists);
pathData.Init(pathParentData);
return(pathData);
}
//
// First, see if the CachedPathData is in the cache.
// we don't use Add for this lookup, as doing so requires
// creating a CacheDependency, which can be slow as it may hit
// the filesystem.
//
string key = CreateKey(configPath);
CacheStoreProvider cacheInternal = HttpRuntime.Cache.InternalCache;
CachedPathData data = (CachedPathData)cacheInternal.Get(key);
// if found, return the data
if (data != null)
{
data.WaitForInit();
return(data);
}
// WOS
bool cacheEntryIsNotRemovable = false;
// if not found, try to add it
string siteID = null;
VirtualPath virtualPath = null;
CachedPathData parentData = null;
CacheDependency dependency = null;
string physicalPath = null;
string[] fileDependencies = null;
string[] cacheItemDependencies = null;
if (WebConfigurationHost.IsMachineConfigPath(configPath))
{
cacheEntryIsNotRemovable = true;
}
else
{
// Make sure we have the parent data so we can create a dependency on the parent.
// The parent dependency will ensure that configuration data in the parent
// will be referenced by a cache hit on the child. (see UtcUpdateUsageRecursive in Cache.cs)
string parentConfigPath = ConfigPathUtility.GetParent(configPath);
parentData = GetConfigPathData(parentConfigPath);
string parentKey = CreateKey(parentConfigPath);
cacheItemDependencies = new string[1] {
parentKey
};
if (!WebConfigurationHost.IsVirtualPathConfigPath(configPath))
{
// assume hardcoded levels above the path, such as root web.config, exist
cacheEntryIsNotRemovable = true;
}
else
{
cacheEntryIsNotRemovable = !isRemovable;
WebConfigurationHost.GetSiteIDAndVPathFromConfigPath(configPath, out siteID, out virtualPath);
physicalPath = GetPhysicalPath(virtualPath);
// Add a dependency on the path itself, if it is a file,
// to handle the case where a file is deleted and replaced
// with a directory of the same name.
if (!String.IsNullOrEmpty(physicalPath))
{
FileUtil.PhysicalPathStatus(physicalPath, false, false, out exists, out isDirectory);
if (exists && !isDirectory)
{
fileDependencies = new string[1] {
physicalPath
};
}
}
}
try {
dependency = new CacheDependency(0, fileDependencies, cacheItemDependencies);
}
catch {
// CacheDependency ctor could fail because of bogus file path
// and it is ok not to watch those
}
}
// Try to add the CachedPathData to the cache.
CachedPathData dataAdd = null;
bool isDataCreator = false;
bool initCompleted = false;
CacheItemPriority priority = cacheEntryIsNotRemovable ? CacheItemPriority.NotRemovable : CacheItemPriority.Normal;
TimeSpan slidingExpiration = cacheEntryIsNotRemovable ? Cache.NoSlidingExpiration : UrlMetadataSlidingExpiration;
try {
using (dependency) {
dataAdd = new CachedPathData(configPath, virtualPath, physicalPath, exists);
try {
}
finally {
data = (CachedPathData)cacheInternal.Add(key, dataAdd, new CacheInsertOptions()
{
Dependencies = dependency,
SlidingExpiration = slidingExpiration,
Priority = priority,
OnRemovedCallback = s_callback
});
if (data == null)
{
isDataCreator = true;
}
}
}
// If another thread added it first, return the data
if (!isDataCreator)
{
data.WaitForInit();
return(data);
}
// This thread is the creator of the CachedPathData, initialize it
lock (dataAdd) {
try {
dataAdd.Init(parentData);
initCompleted = true;
}
finally {
// free waiters
dataAdd._flags[FInited] = true;
// Wake up waiters.
Monitor.PulseAll(dataAdd);
if (dataAdd._flags[FCloseNeeded])
{
// If we have received a call back to close, then lets
// make sure that our config object is cleaned up
dataAdd.Close();
}
}
}
}
finally {
// All the work in this finally block is for the case where we're the
// creator of the CachedPathData.
if (isDataCreator)
{
//
if (!dataAdd._flags[FInited])
{
lock (dataAdd) {
// free waiters
dataAdd._flags[FInited] = true;
// Wake up waiters.
Monitor.PulseAll(dataAdd);
if (dataAdd._flags[FCloseNeeded])
{
// If we have received a call back to close, then lets
// make sure that our config object is cleaned up
dataAdd.Close();
}
}
}
//
// Even though there is a try/catch handler surrounding the call to Init,
// a ThreadAbortException can still cause the handler to be bypassed.
//
// If there is an error, either a thread abort or an error in the config
// file itself, we do want to leave the item cached for a short period
// so that we do not revisit the error and potentially reparse the config file
// on every request.
//
// The reason we simply do not leave the item in the cache forever is that the
// problem that caused the configuration exception may be fixed without touching
// the config file in a way that causes a file change notification (for example, an
// acl change in a parent directory, or a change of path mapping in the metabase).
//
// NOTE: It is important to reinsert the item into the cache AFTER dropping
// the lock on dataAdd, in order to prevent the possibility of deadlock.
//
Debug.Assert(dataAdd._flags[FInited], "_flags[FInited]");
if (!initCompleted || (dataAdd.ConfigRecord != null && dataAdd.ConfigRecord.HasInitErrors))
{
//
// Create a new dependency object as the old one cannot be reused.
// Do not include a file dependency if initialization could not be completed,
// as invoking the file system could lead to further errors during a thread abort.
//
if (dependency != null)
{
if (!initCompleted)
{
dependency = new CacheDependency(0, null, cacheItemDependencies);
}
else
{
dependency = new CacheDependency(0, fileDependencies, cacheItemDependencies);
}
}
using (dependency) {
cacheInternal.Insert(key, dataAdd, new CacheInsertOptions()
{
Dependencies = dependency,
AbsoluteExpiration = DateTime.UtcNow.AddSeconds(5),
OnRemovedCallback = s_callback
});
}
}
}
}
return(dataAdd);
}
private void LoadTransformFromSource()
{
// We're done if we already have a transform
if (_transform != null)
{
return;
}
if (String.IsNullOrEmpty(_transformSource) || _transformSource.Trim().Length == 0)
{
return;
}
// First, figure out if it's a physical or virtual path
VirtualPath virtualPath;
string physicalPath;
ResolvePhysicalOrVirtualPath(_transformSource, out virtualPath, out physicalPath);
CacheStoreProvider cacheInternal = HttpRuntime.Cache.InternalCache;
string key = CacheInternal.PrefixLoadXPath + ((physicalPath != null) ?
physicalPath : virtualPath.VirtualPathString);
object xform = cacheInternal.Get(key);
if (xform == null)
{
Debug.Trace("XmlControl", "Xsl Transform not found in cache (" + _transformSource + ")");
// Get the stream, and open the doc
CacheDependency dependency;
using (Stream stream = OpenFileAndGetDependency(virtualPath, physicalPath, out dependency)) {
// If we don't have a physical path, call MapPath to get one, in order to pass it as
// the baseUri to XmlTextReader. In pure VirtualPathProvider scenarios, it won't
// help much, but it allows the default case to have relative references (VSWhidbey 545322)
if (physicalPath == null)
{
physicalPath = virtualPath.MapPath();
}
// XslCompiledTransform for some reason wants to completely re-create an internal XmlReader
// from scratch. In doing so, it does not respect all the settings of XmlTextReader. So we want
// to be sure to specifically use XmlReader here so our settings on it will be respected by the
// XslCompiledTransform.
XmlReader xmlReader = XmlUtils.CreateXmlReader(stream, physicalPath);
_transform = XmlUtils.CreateXslTransform(xmlReader);
if (_transform == null)
{
_compiledTransform = XmlUtils.CreateXslCompiledTransform(xmlReader);
}
}
// Cache it, but only if we got a dependency
if (dependency != null)
{
using (dependency) {
cacheInternal.Insert(key, ((_compiledTransform == null) ? (object)_transform : (object)_compiledTransform),
new CacheInsertOptions()
{
Dependencies = dependency
});
}
}
}
else
{
Debug.Trace("XmlControl", "XslTransform found in cache (" + _transformSource + ")");
_compiledTransform = xform as XslCompiledTransform;
if (_compiledTransform == null)
{
#pragma warning disable 0618 // To avoid deprecation warning
_transform = (XslTransform)xform;
#pragma warning restore 0618
}
}
}
public override void SetAndReleaseItemExclusive(HttpContext context,
String id,
SessionStateStoreData item,
object lockId,
bool newItem)
{
string key = CreateSessionStateCacheKey(id);
bool doInsert = true;
CacheStoreProvider cacheInternal = HttpRuntime.Cache.InternalCache;
int lockCookieForInsert = NewLockCookie;
ISessionStateItemCollection items = null;
HttpStaticObjectsCollection staticObjects = null;
Debug.Assert(item.Items != null, "item.Items != null");
Debug.Assert(item.StaticObjects != null, "item.StaticObjects != null");
Debug.Assert(item.Timeout <= SessionStateModule.MAX_CACHE_BASED_TIMEOUT_MINUTES, "item.Timeout <= SessionStateModule.MAX_CACHE_BASED_TIMEOUT_MINUTES");
SessionIDManager.CheckIdLength(id, true /* throwOnFail */);
if (item.Items.Count > 0)
{
items = item.Items;
}
if (!item.StaticObjects.NeverAccessed)
{
staticObjects = item.StaticObjects;
}
if (!newItem)
{
Debug.Assert(lockId != null, "lockId != null");
InProcSessionState stateCurrent = (InProcSessionState)cacheInternal.Get(key);
int lockCookie = (int)lockId;
/* If the state isn't there, we probably took too long to run. */
if (stateCurrent == null)
{
return;
}
Debug.Trace("SessionStateClientSet", "state is inStorage; key = " + key);
Debug.Assert((stateCurrent._flags & (int)SessionStateItemFlags.Uninitialized) == 0, "Should never set an unitialized item; key = " + key);
stateCurrent._spinLock.AcquireWriterLock();
try {
/* Only set the state if we are the owner */
if (!stateCurrent._locked || stateCurrent._lockCookie != lockCookie)
{
Debug.Trace("SessionStateClientSet", "Leave because we're not the owner; key = " + key);
return;
}
/* We can change the state in place if the timeout hasn't changed */
if (stateCurrent._timeout == item.Timeout)
{
stateCurrent.Copy(
items,
staticObjects,
item.Timeout,
false,
DateTime.MinValue,
lockCookie,
stateCurrent._flags);
// Don't need to insert into the Cache because an in-place copy is good enough.
doInsert = false;
Debug.Trace("SessionStateClientSet", "Changing state inplace; key = " + key);
}
else
{
/* We are going to insert a new item to replace the current one in Cache
* because the expiry time has changed.
*
* Pleas note that an insert will cause the Session_End to be incorrectly raised.
*
* Please note that the item itself should not expire between now and
* where we do UtcInsert below because cacheInternal.Get above have just
* updated its expiry time.
*/
stateCurrent._flags |= (int)SessionStateItemFlags.IgnoreCacheItemRemoved;
/* By setting _lockCookie to 0, we prevent an overwriting by ReleaseExclusive
* when we drop the lock.
* The scenario can happen if another request is polling and trying to prempt
* the lock we have on the item.
*/
lockCookieForInsert = lockCookie;
stateCurrent._lockCookie = 0;
}
}
finally {
stateCurrent._spinLock.ReleaseWriterLock();
}
}
if (doInsert)
{
Debug.Trace("SessionStateClientSet", "Inserting state into Cache; key = " + key);
InProcSessionState state = new InProcSessionState(
items,
staticObjects,
item.Timeout,
false,
DateTime.MinValue,
lockCookieForInsert,
0);
try {
}
finally {
// protected from ThreadAbortEx
cacheInternal.Insert(key, state, new CacheInsertOptions()
{
SlidingExpiration = new TimeSpan(0, state._timeout, 0),
Priority = CacheItemPriority.NotRemovable,
OnRemovedCallback = _callback
});
PerfCounters.IncrementCounter(AppPerfCounter.SESSIONS_TOTAL);
PerfCounters.IncrementCounter(AppPerfCounter.SESSIONS_ACTIVE);
TraceSessionStats();
}
}
}
//
// Actually computes the browser capabilities
//
internal HttpCapabilitiesBase Evaluate(HttpRequest request)
{
HttpCapabilitiesBase result;
CacheStoreProvider cacheInternal = System.Web.HttpRuntime.Cache.InternalCache;
//
// 1) grab UA and do optimistic cache lookup (if UA is in dependency list)
//
string userAgent = GetUserAgent(request);
string userAgentCacheKey = userAgent;
// Use the shorten userAgent as the cache key.
Debug.Assert(UserAgentCacheKeyLength != 0);
// Trim the useragent string based on <browserCaps> config
if (userAgentCacheKey != null && userAgentCacheKey.Length > UserAgentCacheKeyLength)
{
userAgentCacheKey = userAgentCacheKey.Substring(0, UserAgentCacheKeyLength);
}
bool doFullCacheKeyLookup = false;
string optimisticCacheKey = _cacheKeyPrefix + userAgentCacheKey;
object optimisticCacheResult = cacheInternal.Get(optimisticCacheKey);
// optimize for common case (desktop browser)
result = optimisticCacheResult as HttpCapabilitiesBase;
if (result != null)
{
return(result);
}
//
// 1.1) optimistic cache entry could tell us to do full cache lookup
//
if (optimisticCacheResult == _disableOptimisticCachingSingleton)
{
doFullCacheKeyLookup = true;
}
else
{
// cache it and respect _cachetime
result = EvaluateFinal(request, true);
// Optimized cache key is disabled if the request matches any headers defined within identifications.
if (result.UseOptimizedCacheKey)
{
// Use the same browserCap result if one with the same capabilities can be found in the cache.
// This is to reduce the number of identical browserCap instances being cached.
CacheBrowserCapResult(ref result);
// Cache the result using the optimisicCacheKey
cacheInternal.Insert(optimisticCacheKey, result, new CacheInsertOptions()
{
SlidingExpiration = _cachetime
});
return(result);
}
}
//
// 2) either:
//
// We've never seen the UA before (parse all headers to
// determine if the new UA also carries modile device
// httpheaders).
//
// It's a mobile UA (so parse all headers) and do full
// cache lookup
//
// UA isn't in dependency list (customer custom caps section)
//
IDictionaryEnumerator de = _variables.GetEnumerator();
StringBuilder sb = new StringBuilder(_cacheKeyPrefix);
InternalSecurityPermissions.AspNetHostingPermissionLevelLow.Assert();
while (de.MoveNext())
{
string key = (string)de.Key;
string value;
if (key.Length == 0)
{
value = userAgent;
}
else
{
value = request.ServerVariables[key];
}
if (value != null)
{
sb.Append(value);
}
}
CodeAccessPermission.RevertAssert();
sb.Append(BrowserCapabilitiesFactoryBase.GetBrowserCapKey(BrowserCapFactory.InternalGetMatchedHeaders(), request));
string fullCacheKey = sb.ToString();
//
// Only do full cache lookup if the optimistic cache
// result was _disableOptimisticCachingSingleton or
// if UserAgent wasn't in the cap var list.
//
if (userAgent == null || doFullCacheKeyLookup)
{
result = cacheInternal.Get(fullCacheKey) as HttpCapabilitiesBase;
if (result != null)
{
return(result);
}
}
result = EvaluateFinal(request, false);
// Use the same browserCap result if one with the same matched nodes can be found in the cache.
// This is to reduce the number of identical browserCap instances being cached.
CacheBrowserCapResult(ref result);
// cache it and respect _cachetime
cacheInternal.Insert(fullCacheKey, result, new CacheInsertOptions()
{
SlidingExpiration = _cachetime
});
if (optimisticCacheKey != null)
{
cacheInternal.Insert(optimisticCacheKey, _disableOptimisticCachingSingleton, new CacheInsertOptions()
{
SlidingExpiration = _cachetime
});
}
return(result);
}
unsafe IntPtr FinishPut(HttpContext context)
{
HttpRequest request = context.Request;
HttpResponse response = context.Response;
Stream requestStream;
byte[] buf;
int timeoutMinutes;
TimeSpan timeout;
int extraFlags;
string key;
CachedContent content;
CachedContent contentCurrent;
int lockCookie;
int lockCookieNew = 1;
IntPtr stateItem;
CacheStoreProvider cacheInternal = HttpRuntime.Cache.InternalCache;
/* create the content */
requestStream = request.InputStream;
int bufferSize = (int)(requestStream.Length - requestStream.Position);
buf = new byte[bufferSize];
requestStream.Read(buf, 0, buf.Length);
fixed(byte *pBuf = buf)
{
// The ctor of StateHttpWorkerRequest convert the native pointer address
// into an array of bytes, and in our we revert it back to an IntPtr
stateItem = (IntPtr)(*((void **)pBuf));
}
/* get headers */
if (!GetOptionalNonNegativeInt32HeaderValue(context, StateHeaders.TIMEOUT_NAME, out timeoutMinutes))
{
return(stateItem);
}
if (timeoutMinutes == -1)
{
timeoutMinutes = SessionStateModule.TIMEOUT_DEFAULT;
}
if (timeoutMinutes > SessionStateModule.MAX_CACHE_BASED_TIMEOUT_MINUTES)
{
ReportInvalidHeader(context, StateHeaders.TIMEOUT_NAME);
return(stateItem);
}
timeout = new TimeSpan(0, timeoutMinutes, 0);
bool found;
if (!GetOptionalInt32HeaderValue(context, StateHeaders.EXTRAFLAGS_NAME, out extraFlags, out found))
{
return(stateItem);
}
if (!found)
{
extraFlags = 0;
}
/* lookup current value */
key = CreateKey(request);
contentCurrent = (CachedContent)cacheInternal.Get(key);
if (contentCurrent != null)
{
// DevDivBugs 146875: Expired Session State race condition
// We make sure we do not overwrite an already existing item with an uninitialized item.
if (((int)SessionStateItemFlags.Uninitialized & extraFlags) == 1)
{
return(stateItem);
}
if (!GetOptionalNonNegativeInt32HeaderValue(context, StateHeaders.LOCKCOOKIE_NAME, out lockCookie))
{
return(stateItem);
}
contentCurrent._spinLock.AcquireWriterLock();
try {
if (contentCurrent._content == null)
{
ReportNotFound(context);
return(stateItem);
}
/* Only set the item if we are the owner */
if (contentCurrent._locked && (lockCookie == -1 || lockCookie != contentCurrent._lockCookie))
{
ReportLocked(context, contentCurrent);
return(stateItem);
}
if (contentCurrent._slidingExpiration == timeout && contentCurrent._content != null)
{
/* delete the old state item */
IntPtr stateItemOld = contentCurrent._stateItem;
/* change the item in place */
contentCurrent._content = buf;
contentCurrent._stateItem = stateItem;
contentCurrent._locked = false;
return(stateItemOld);
}
/*
* The timeout has changed. In this case, we are removing the old item and
* inserting a new one.
* Update _extraFlags to ignore the cache item removed callback (this way,
* we will not decrease the number of active sessions).
*/
contentCurrent._extraFlags |= (int)SessionStateItemFlags.IgnoreCacheItemRemoved;
/*
* If not locked, keep it locked until it is completely replaced.
* Prevent overwriting when we drop the lock.
*/
contentCurrent._locked = true;
contentCurrent._lockCookie = 0;
lockCookieNew = lockCookie;
}
finally {
contentCurrent._spinLock.ReleaseWriterLock();
}
}
content = new CachedContent(buf, stateItem, false, DateTime.MinValue, timeout, lockCookieNew, extraFlags);
cacheInternal.Insert(key, content, new CacheInsertOptions()
{
SlidingExpiration = timeout,
Priority = CacheItemPriority.NotRemovable,
OnRemovedCallback = _removedHandler
});
if (contentCurrent == null)
{
IncrementStateServiceCounter(StateServicePerfCounter.STATE_SERVICE_SESSIONS_TOTAL);
IncrementStateServiceCounter(StateServicePerfCounter.STATE_SERVICE_SESSIONS_ACTIVE);
}
return(IntPtr.Zero);
}
