/// <summary> /// Helper method for serializing objects to Redis /// </summary> /// <param name="confirmedChangedObjects">keys and values that have definitely changed</param> /// <param name="allObjects">keys and values that have been accessed during the current HttpContext</param> /// <param name="allObjectsOriginalState">keys and serialized values before we tampered with them</param> /// <param name="deletedObjects">keys that were deleted during the current HttpContext</param> /// <param name="currentRedisHashId">The current Redis key name</param> /// <param name="redisConn">A connection to Redis</param> public static void SerializeToRedis( HttpContextBase context, RedisSessionStateItemCollection redisItems, string currentRedisHashId, TimeSpan expirationTimeout) { var setItems = new List <KeyValuePair <string, string> >(); var delItems = new List <string>(); // Determine if we are adding or removing keys, separate them into their own lists // note that redisItems.GetChangedObjectsEnumerator contains complex logic foreach (KeyValuePair <string, string> changedObj in redisItems.GetChangedObjectsEnumerator()) { if (changedObj.Value != null) { setItems.Add(changedObj); } else { delItems.Add(changedObj.Key); } } var rConnWrap = RedisSessionStateStoreProvider.RedisConnWrapper(); if (setItems.Count > 0) { rConnWrap.HashSet(currentRedisHashId, setItems); // call appropriate delegate if set for changing keys if (RedisSessionConfig.RedisWriteFieldDel != null) { RedisSessionConfig.RedisWriteFieldDel(context, setItems, currentRedisHashId); } } if (delItems != null && delItems.Count > 0) { rConnWrap.HashDelete(currentRedisHashId, delItems); // call appropriate delegate if set for removing keys if (RedisSessionConfig.RedisRemoveFieldDel != null) { RedisSessionConfig.RedisRemoveFieldDel(context, delItems, currentRedisHashId); } } // always refresh the timeout of the session hash rConnWrap.KeyExpire(currentRedisHashId, expirationTimeout); }
/// <summary> /// Gets a Session from Redis, indicating a non-exclusive lock on the Session. Note that GetItemExclusive /// calls this method internally, meaning we do not support locks at all retrieving the Session. /// </summary> /// <param name="context">The HttpContext of the current request</param> /// <param name="id">The Session Id, which is the key name in Redis</param> /// <param name="locked">Whether or not the Session is locked to exclusive access for a single request /// thread</param> /// <param name="lockAge">The age of the lock</param> /// <param name="lockId">The object used to lock the Session</param> /// <param name="actions">Whether or not to initialize the Session (never)</param> /// <returns>The Session objects wrapped in a SessionStateStoreData object</returns> public override SessionStateStoreData GetItem(HttpContext context, string id, out bool locked, out TimeSpan lockAge, out object lockId, out SessionStateActions actions) { locked = false; lockAge = new TimeSpan(0); lockId = null; actions = SessionStateActions.None; try { string parsedRedisHashId = RedisSessionStateStoreProvider.RedisHashIdFromSessionId( new HttpContextWrapper(context), id); LocalSharedSessionDictionary sharedSessDict = new LocalSharedSessionDictionary(); RedisSessionStateItemCollection items = sharedSessDict.GetSessionForBeginRequest( parsedRedisHashId, (redisKey) => { return(RedisSessionStateStoreProvider.GetItemFromRedis( redisKey, new HttpContextWrapper(context), this.SessionTimeout)); }); return(new SessionStateStoreData( items, SessionStateUtility.GetSessionStaticObjects(context), Convert.ToInt32(this.SessionTimeout.TotalMinutes))); } catch (Exception e) { if (RedisSessionConfig.SessionExceptionLoggingDel != null) { RedisSessionConfig.SessionExceptionLoggingDel(e); } } return(this.CreateNewStoreData(context, Convert.ToInt32(this.SessionTimeout.TotalMinutes))); }
/// <summary> /// Gets a session for a given redis ID, and increments the count of the number of requests /// that have accessed this redis ID /// </summary> /// <param name="redisHashId">The id of the session in Redis</param> /// <param name="getDel">The delegate to run to fetch the session from Redis</param> /// <returns>A RedisSessionStateItemCollection for the session</returns> public RedisSessionStateItemCollection GetSessionForBeginRequest( string redisHashId, Func <string, RedisSessionStateItemCollection> getDel) { SessionAndRefCount sessAndCount = LocalSharedSessionDictionary.localCache.AddOrUpdate( redisHashId, (redisKey) => { RedisSessionStateItemCollection itms = getDel(redisHashId); return(new SessionAndRefCount(itms)); }, (redisKey, existingItem) => { Interlocked.Increment(ref existingItem.RequestReferences); existingItem.LastAccess = DateTime.Now; return(existingItem); }); return(sessAndCount.Sess); }
/// <summary> /// Checks if any items have changed in the Session, and stores the results to Redis /// </summary> /// <param name="context">The HttpContext of the current web request</param> /// <param name="id">The Session Id and Redis key name</param> /// <param name="item">The Session properties</param> /// <param name="lockId">The object used to exclusively lock the Session (there shouldn't be one)</param> /// <param name="newItem">Whether or not the Session was created in this HttpContext</param> public override void SetAndReleaseItemExclusive(HttpContext context, string id, SessionStateStoreData item, object lockId, bool newItem) { try { string currentRedisHashId = RedisSessionStateStoreProvider.RedisHashIdFromSessionId( new HttpContextWrapper(context), id); LocalSharedSessionDictionary sharedSessDict = new LocalSharedSessionDictionary(); RedisSessionStateItemCollection redisItems = sharedSessDict.GetSessionForEndRequest(currentRedisHashId); // we were unable to pull it from shared cache, meaning either this is the first request or // something went wrong with the local cache. We still have all the parts needed to write // to redis, however, by looking at SessionStateStoreData passed in from the Session module // and the current hash key provided by the id parameter. if (redisItems == null) { redisItems = (RedisSessionStateItemCollection)item.Items; } if (redisItems != null) { RedisSessionStateStoreProvider.SerializeToRedis( new HttpContextWrapper(context), redisItems, currentRedisHashId, this.SessionTimeout); } } catch (Exception e) { if (RedisSessionConfig.SessionExceptionLoggingDel != null) { RedisSessionConfig.SessionExceptionLoggingDel(e); } } }
private static void ClearRedisItems(RedisSessionStateItemCollection items, int size) { items.Clear(); }
/// <summary> /// Initializes a new instance of the SessionAndRefCount class with a given item collection /// and count of requests using it /// </summary> /// <param name="itms">The items in a session</param> /// <param name="count">The number of requests accessing this session</param> public SessionAndRefCount(RedisSessionStateItemCollection itms, int count) { this.Sess = itms; this.RequestReferences = count; this.LastAccess = DateTime.Now; }
/// <summary> /// Initializes a new instance of the SessionAndRefCount class with a given item collection /// </summary> /// <param name="itms">The items in a session</param> public SessionAndRefCount(RedisSessionStateItemCollection itms) : this(itms, 1) { }