1、这两天研究Redis搞分布式session问题，网上找的资料都是用ServiceStack.Redis来实现的，但是在做性能测试的时候发现最新的v4版本有限制每小时候最多请求6000次，因为官网开始商业化要收费了，好坑爹的说，还好我前期弄了个性能测试列子，不然上线以后出问题那就麻烦了。后面找了个NServiceKit.Redis（好像就是ServiceStack.Redis的v3版本）来替代v4的收费版。
2、解决方案是 Redis+cookie方式实现记录用户登录状态
cookie：存放用户的ID，这个ID是经过加密的，并且后台可以通过密钥解密。
Redis：key/value 方式存储，key存放比如：user_1。 value存放用户实体对象。
3、先安装一个Redis，windows的版本在本地进行测试，后期上线更换linux系统的Redis替换一下ip就可以了。
4、添加一个Session管理类
public class SessionHelper{private const int secondsTimeOut = 60 * 20; //默认过期时间20分钟 单位秒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);//距离过期时间还有多少秒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操作类
public class RedisHelper : IDisposable{private RedisClient Redis = new RedisClient("127.0.0.1", 6379);//缓存池PooledRedisClientManager prcm = new PooledRedisClientManager();//默认缓存过期时间单位秒public int secondsTimeOut = 20 * 60;/// <summary>/// 缓冲池/// </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>/// 构造函数/// </summary>/// <param name="OpenPooledRedis">是否开启缓冲池</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>/// 距离过期时间还有多少秒/// </summary>/// <param name="key"></param>/// <returns></returns>public long TTL(string key){return Redis.Ttl(key);}/// <summary>/// 设置过期时间/// </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存储/// <summary>/// 设置缓存/// </summary>/// <typeparam name="T"></typeparam>/// <param name="key">缓存建</param>/// <param name="t">缓存值</param>/// <param name="timeout">过期时间，单位秒,-1：不过期，0：默认过期时间</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>/// 获取/// </summary>/// <typeparam name="T"></typeparam>/// <param name="key"></param>/// <returns></returns>public T Get<T>(string key){return Redis.Get<T>(key);}/// <summary>/// 删除/// </summary>/// <param name="key"></param>/// <returns></returns>public bool Remove(string key){return Redis.Remove(key);}#endregion//释放资源public void Dispose(){if (Redis != null){Redis.Dispose();Redis = null;}GC.Collect();}}
