/// <summary>
/// Gets a hash from Redis and passes it to the constructor of RedisSessionStateItemCollection
/// </summary>
/// <param name="redisKey">The key of the Redis hash</param>
/// <param name="context">The HttpContext of the current web request</param>
/// <returns>An instance of RedisSessionStateItemCollection, may be empty if Redis call fails</returns>
public static RedisSessionStateItemCollection GetItemFromRedis(
string redisKey,
HttpContextBase context,
TimeSpan expirationTimeout)
{
RedisConnectionWrapper rConnWrap = RedisSessionStateStoreProvider.RedisConnWrapperFromContext(
context);
IDatabase redisConn = rConnWrap.GetConnection();
try
{
HashEntry[] redisData = redisConn.HashGetAll(redisKey);
redisConn.KeyExpire(redisKey, expirationTimeout, CommandFlags.FireAndForget);
return(new RedisSessionStateItemCollection(
redisData,
rConnWrap.ConnectionID,
0));
}
catch (Exception e)
{
if (RedisSessionConfig.SessionExceptionLoggingDel != null)
{
RedisSessionConfig.SessionExceptionLoggingDel(e);
}
}
return(new RedisSessionStateItemCollection());
}
/// <summary>
/// Deletes an entire Session from Redis by removing the key.
/// </summary>
/// <param name="context">The HttpContext of the current request</param>
/// <param name="id">The Session Id</param>
/// <param name="lockId">The object used to lock the Session</param>
/// <param name="item">The Session's properties</param>
public override void RemoveItem(HttpContext context, string id, object lockId, SessionStateStoreData item)
{
RedisConnectionWrapper rConnWrap = RedisSessionStateStoreProvider.RedisConnWrapperFromContext(
new HttpContextWrapper(context));
IDatabase redisConn = rConnWrap.GetConnection();
redisConn.KeyDelete(
RedisSessionStateStoreProvider.RedisHashIdFromSessionId(
new HttpContextWrapper(context),
id),
CommandFlags.FireAndForget);
}
/// <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)
{
List <HashEntry> setItems = new List <HashEntry>();
List <RedisValue> delItems = new List <RedisValue>();
RedisConnectionWrapper rConnWrap = RedisSessionStateStoreProvider.RedisConnWrapperFromContext(
context);
foreach (KeyValuePair <string, string> changedObj in
redisItems.GetChangedObjectsEnumerator())
{
if (changedObj.Value != null)
{
setItems.Add(
new HashEntry(
changedObj.Key,
changedObj.Value));
}
else
{
delItems.Add(changedObj.Key);
}
}
IDatabase redisConn = rConnWrap.GetConnection();
redisConn.KeyExpire(
currentRedisHashId,
expirationTimeout,
CommandFlags.FireAndForget);
if (setItems.Count > 0)
{
redisConn.HashSet(
currentRedisHashId,
setItems.ToArray(),
CommandFlags.FireAndForget);
}
if (delItems != null && delItems.Count > 0)
{
redisConn.HashDelete(
currentRedisHashId,
delItems.ToArray(),
CommandFlags.FireAndForget);
}
}
/// <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)
{
RedisConnectionWrapper rConnWrap = RedisSessionStateStoreProvider.RedisConnWrapperFromContext(context);
var setItems = new List <HashEntry>();
var delItems = new List <RedisValue>();
// 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(new HashEntry(changedObj.Key, changedObj.Value));
}
else
{
delItems.Add(changedObj.Key);
}
}
IDatabase redisConn = rConnWrap.GetConnection(currentRedisHashId);
if (setItems.Count > 0)
{
HashEntry[] writeItems = setItems.ToArray();
redisConn.HashSet(currentRedisHashId, writeItems, CommandFlags.FireAndForget);
// call appropriate delegate if set for changing keys
if (RedisSessionConfig.RedisWriteFieldDel != null)
{
RedisSessionConfig.RedisWriteFieldDel(context, writeItems, currentRedisHashId);
}
}
if (delItems != null && delItems.Count > 0)
{
RedisValue[] removeItems = delItems.ToArray();
redisConn.HashDelete(currentRedisHashId, removeItems, CommandFlags.FireAndForget);
// call appropriate delegate if set for removing keys
if (RedisSessionConfig.RedisRemoveFieldDel != null)
{
RedisSessionConfig.RedisRemoveFieldDel(context, removeItems, currentRedisHashId);
}
}
// always refresh the timeout of the session hash
redisConn.KeyExpire(currentRedisHashId, expirationTimeout, CommandFlags.FireAndForget);
}
