1、這兩天研究Redis搞分布式session問題，網上找的資料都是用ServiceStack.Redis來實現的，但是在做性能測試的時候發現最新的v4版本有限制每小時候最多請求6000次，因為官網開始商業化要收費了，好坑爹的說，還好我前期弄了個性能測試列子，不然上線以后出問題那就麻煩了。后面找了個NServiceKit.Redis（好像就是ServiceStack.Redis的v3版本）來替代v4的收費版。
2、解決方案是 Redis+cookie方式實現記錄用戶登錄狀態
? ? ?cookie：存放用戶的ID，這個ID是經過加密的，并且后臺可以通過密鑰解密。
? ? ?Redis：key/value 方式存儲，key存放比如：user_1。 ?value存放用戶實體對象。
3、先安裝一個Redis，windows的版本在本地進行測試，后期上線更換linux系統的Redis替換一下ip就可以了。
4、添加一個Session管理類
public class SessionHelper{private const int secondsTimeOut = 60 * 20; //默認過期時間20分鐘 單位秒public RedisHelper Redis = new RedisHelper(false);public LoginUserInfo this[string key]{get{string webCookie = WebHelper.GetCookie(key);if (webCookie == ""){return null;}key = key + "_" + SecureHelper.AESDecrypt(webCookie);//距離過期時間還有多少秒long l = Redis.TTL(key);if (l >= 0){Redis.Expire(key, secondsTimeOut);}return Redis.Get<LoginUserInfo>(key);}set{SetSession(key, value);}}public void SetSession(string key, LoginUserInfo value){if (string.IsNullOrWhiteSpace(key)){throw new Exception("Key is Null or Epmty");}WebHelper.SetCookie(key, SecureHelper.AESEncrypt(value.ID.ToString()));key = key + "_" + value.ID;Redis.Set<LoginUserInfo>(key, value, secondsTimeOut);}/// <summary>/// 移除Session/// </summary>/// <param name="key"></param>/// <returns></returns>public bool Remove(string key){var rs = Redis.Remove(key + "_" + SecureHelper.AESDecrypt(WebHelper.GetCookie(key)));WebHelper.DeleteCookie(key);return rs;}}
5、Redis操作類
public class RedisHelper : IDisposable{private RedisClient Redis = new RedisClient("127.0.0.1", 6379);//緩存池PooledRedisClientManager prcm = new PooledRedisClientManager();//默認緩存過期時間單位秒public int secondsTimeOut = 20 * 60;/// <summary>/// 緩沖池/// </summary>/// <param name="readWriteHosts"></param>/// <param name="readOnlyHosts"></param>/// <returns></returns>public static PooledRedisClientManager CreateManager(string[] readWriteHosts, string[] readOnlyHosts){return new PooledRedisClientManager(readWriteHosts, readOnlyHosts,new RedisClientManagerConfig{MaxWritePoolSize = readWriteHosts.Length * 5,MaxReadPoolSize = readOnlyHosts.Length * 5,AutoStart = true,}); }/// <summary>/// 構造函數/// </summary>/// <param name="OpenPooledRedis">是否開啟緩沖池</param>public RedisHelper(bool OpenPooledRedis = false){if (OpenPooledRedis){prcm = CreateManager(new string[] { "127.0.0.1:6379" }, new string[] { "127.0.0.1:6379" });Redis = prcm.GetClient() as RedisClient;}}/// <summary>/// 距離過期時間還有多少秒/// </summary>/// <param name="key"></param>/// <returns></returns>public long TTL(string key){return Redis.Ttl(key);}/// <summary>/// 設置過期時間/// </summary>/// <param name="key"></param>/// <param name="timeout"></param>public void Expire(string key,int timeout = 0){if (timeout >= 0){if (timeout > 0){secondsTimeOut = timeout;}Redis.Expire(key, secondsTimeOut);}}#region Key/Value存儲/// <summary>/// 設置緩存/// </summary>/// <typeparam name="T"></typeparam>/// <param name="key">緩存建</param>/// <param name="t">緩存值</param>/// <param name="timeout">過期時間，單位秒,-1：不過期，0：默認過期時間</param>/// <returns></returns>public bool Set<T>(string key, T t, int timeout = 0){Redis.Set<T>(key, t);if (timeout >= 0){if (timeout > 0){secondsTimeOut = timeout;}Redis.Expire(key, secondsTimeOut);}return true;}/// <summary>/// 獲取/// </summary>/// <typeparam name="T"></typeparam>/// <param name="key"></param>/// <returns></returns>public T Get<T>(string key){return Redis.Get<T>(key);}/// <summary>/// 刪除/// </summary>/// <param name="key"></param>/// <returns></returns>public bool Remove(string key){return Redis.Remove(key);}#endregion//釋放資源public void Dispose(){if (Redis != null){Redis.Dispose();Redis = null;}GC.Collect();}}
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