Redis for C#
ServiceStack.Redis
初识Redis时接触到的.Net-Redis组件是 ServiceStack.Redis,其V3系列的最新版本是:ServiceStack.Redis.3.9.29.0。
ServiceStack.Common.dll
ServiceStack.Interfaces.dll
ServiceStack.Redis.dll
ServiceStack.Text.dll
RedisClient
public void Init();
public bool ContainsKey(string key);
public bool Remove(string key);
public void RemoveByPattern(string pattern);
public void RemoveByRegex(string pattern);
public IEnumerable<string> GetKeysByPattern(string pattern);
public List<string> SearchKeys(string pattern);
public List<string> GetAllKeys(); // 数据库内的所有键(慎用)
public string GetRandomKey();
public T Get<T>(string key);
public IRedisTypedClient<T> As<T>(); // /* 重要 */
public bool Add<T>(string key, T value [, DateTime expiresAt]); // [设置过期时间]
public bool Add<T>(string key, T value [, TimeSpan expiresIn]);
public bool Set<T>(string key, T value [, DateTime expiresAt]); // [设置过期时间]
public bool Set<T>(string key, T value [, TimeSpan expiresIn]);
public bool ExpireEntryAt(string key, DateTime expireAt); // 设置过期时间
public bool ExpireEntryIn(string key, TimeSpan expireIn);
public TimeSpan GetTimeToLive(string key); // TTL时间
public long DecrementValue(string key); // 减
public long DecrementValueBy(string key, int count);
public long IncrementValue(string key); // 增
public long IncrementValueBy(string key, int count);
支持类型
// string
public long GetStringCount(string key);
public string GetValue(string key);
public void SetValue(string key, string value [, TimeSpan expireIn]);
public void RenameKey(string fromName, string toName);
public int AppendToValue(string key, string value);
public string GetAndSetValue(string key, string value);
public string GetSubstring(string key, int fromIndex, int toIndex);
public List<string> GetValues(List<string> keys);
public Dictionary<string, string> GetValuesMap(List<string> keys); // List
public int GetListCount(string listId);
public int RemoveItemFromList(string listId, string value);
public string RemoveStart/End/AllFromList(string listId);
public void SetItemInList(string listId, int listIndex, string value);
public void AddItemToList(string listId, string value);
public void AddRangeToList(string listId, List<string> values);
public List<string> GetAllItemsFromList(string listId);
public string GetItemFromList(string listId, int listIndex);
public List<string> GetRangeFromList(string listId, int startingFrom, int endingAt);
public List<string> GetRangeFromSortedList(string listId, int startingFrom, int endingAt);
public List<string> GetSortedItemsFromList(string listId, SortOptions sortOptions);
public List<T> GetValues<T>(List<string> keys);
public Dictionary<string, T> GetValuesMap<T>(List<string> keys);
// List作为队列
public void EnqueueItemOnList(string listId, string value);
public string DequeueItemFromList(string listId);
// List作为栈
public void PushItemToList(string listId, string value);
public string PopItemFromList(string listId);
public string PopAndPushItemBetweenLists(string fromListId, string toListId); // Set
public int GetSetCount(string setId);
public bool SetContainsItem(string setId, string item);
public void RemoveItemFromSet(string setId, string item);
public void AddItemToSet(string setId, string item);
public void AddRangeToSet(string setId, List<string> items);
public HashSet<string> GetAllItemsFromSet(string setId);
public string GetRandomItemFromSet(string setId);
public List<string> GetSortedEntryValues(string setId, int startingFrom, int endingAt);
public HashSet<string> GetDifferencesFromSet(string fromSetId, params string[] withSetIds);
public HashSet<string> GetIntersectFromSets(params string[] setIds);
public HashSet<string> GetUnionFromSets(params string[] setIds);
public void StoreDifferencesFromSet(string intoSetId, string fromSetId, params string[] withSetIds);
public void StoreIntersectFromSets(string intoSetId, params string[] setIds);
public void StoreUnionFromSets(string intoSetId, params string[] setIds);
public void MoveBetweenSets(string fromSetId, string toSetId, string item);
public string PopItemFromSet(string setId); // Hash
public int GetHashCount(string hashId);
public bool HashContainsEntry(string hashId, string key);
public bool RemoveEntryFromHash(string hashId, string key);
public bool SetEntryInHash(string hashId, string key, string value);
public List<string> GetHashKeys(string hashId);
public List<string> GetHashValues(string hashId);
public Dictionary<string, string> GetAllEntriesFromHash(string hashId);
public string GetValueFromHash(string hashId, string key);
public List<string> GetValuesFromHash(string hashId, params string[] keys);
public T GetFromHash<T>(object id); // SortedSet(zset)
public int GetSortedSetCount(string setId);
public bool SortedSetContainsItem(string setId, string value);
public bool RemoveItemFromSortedSet(string setId, string value);
public bool AddItemToSortedSet(string setId, string value [, double score]);
public bool AddRangeToSortedSet(string setId, List<string> values [, double score]);
public List<string> GetRangeFromSortedSet(string setId, int fromRank, int toRank);
public IDictionary<string, double> GetRangeWithScoresFromSortedSet(string setId, int fromRank, int toRank);
public List<string> GetAllItemsFromSortedSet[Desc](string setId);
public IDictionary<string, double> GetAllWithScoresFromSortedSet(string setId);
其中, public IRedisTypedClient<T> As<T>(); 搭配接口 public interface IRedisTypedClient<T> : IEntityStore<T>{} 和 public interface IEntityStore<T>{} 中提供的方法可以完成各种操作。
在V3.0版本的基础上,其V4.0版本 ServiceStack.Redis-4.0.52 提供了更多的方法:
- Scan方法;
- 获取设置配置信息;
- 支持Lua脚本;
public RedisText Custom(params object[] cmdWithArgs); // 执行命令
public RedisClient CloneClient();
public string GetClient();
public void SetClient(string name);
public void KillClient(string address);
public void ChangeDb(long db);
public DateTime GetServerTime();
public DateTime ConvertToServerDate(DateTime expiresAt);
public List<Dictionary<string, string>> GetClientsInfo();
public string GetConfig(string configItem);
public void SetConfig(string configItem, string value);
public void SaveConfig();
public void ResetInfoStats();
其中,Custom()方法可以执行绝大多数的Redis命令,ServiceStack.Redis.Commands定义命令,用于Custom()方法的第一个参数:
public static class Commands{
public static readonly byte[] CommandName;
}
由于ServiceStack.Redis的V4.0版本沦为商业用途,需充值否则限制:1)数据类型; 2)每小时访问次数6000
关于破解V4.0版本限制,参见:https://blog.csdn.net/hwt0101/article/details/80545383
虽然ServiceStack.Redis有15%的性能优势,但还是推荐使用:StackExchange.Redis
StackExchange.Redis
StackExchange.Redis是专为.Net的Redis客户端API,被StackOverFlow、微软官方RedisSessionStateProvider也采用StackExchange.Redis实现。Cache组件 | 微软官方;
RedisHelper.dll
StackExchange.Redis.dll
核心:ConnectionMultiplexer类(线程安全),在命名空间StackExchange.Redis中定义,封装Redis服务的操作细节,该类的实例被整个应用程序域共享和重用
ConnectionMultiplexer redisClient = ConnectionMultiplexer.Connect("localhost");
IDatabase db = redisClient .GetDatabase();
提供一个工具类参考
public class RedisUtils<T> where T : class
{
private readonly ConnectionMultiplexer redisConnect;
private readonly IDatabase db;
private readonly JilJsonUtil<T> _jilUtil; public RedisUtils(string connectionString)
{
_jilUtil = new JilJsonUtil<T>();
redisConnect = ConnectionMultiplexer.Connect(connectionString);
redisConnect.PreserveAsyncOrder = false;
db = redisConnect.GetDatabase();
} public string GetString(string _key)
{
return db.StringGet(_key);
}
public Dictionary<String, T> GetBatch(HashSet<String> keys)
{
Dictionary<String, T> res = new Dictionary<String, T>(); Dictionary<string, RedisValue> stringPipelineDic= GetStringPipelining(keys);
foreach (var key in stringPipelineDic.Keys)
{
var value = stringPipelineDic[key];
if (!value.IsNullOrEmpty)
{
res.Add(key, _jilUtil.Deserialize(value));
}
} return res;
} ///批量查询
private Dictionary<string, RedisValue> GetStringPipelining(HashSet<String> keys)
{
Dictionary<string, RedisValue> res = new Dictionary<string, RedisValue>(); Dictionary<string, Task<RedisValue>> tmp = new Dictionary<string, Task<RedisValue>>();
IBatch batch = db.CreateBatch();
foreach (var it in keys)
{
Task<RedisValue> stringGetAsync = batch.StringGetAsync(it);
tmp.Add(it, stringGetAsync);
}
batch.Execute(); foreach (var it in keys)
{
Task<RedisValue> stringGetAsync = tmp[it];
if (!stringGetAsync.Result.IsNullOrEmpty)
{
res.Add(it, stringGetAsync.Result);
}
} return res;
} ///存单个string的最大值是512M
public bool SetString(string key, string valStr, int seconds)
{
return db.StringSet(key, valStr, TimeSpan.FromSeconds(seconds));
}
public bool Set(string key, T value, int seconds)
{
var jsonStr = _jilUtil.Serialize(value);
return db.StringSet(key, jsonStr, TimeSpan.FromSeconds(seconds));
} ///PipeLine
public void SetBatch(Dictionary<string, T> dic, int seconds)
{
IBatch ibatch = db.CreateBatch();
foreach (var _key in dic.Keys)
{
T val = dic[_key];
ibatch.StringSetAsync(_key, _jilUtil.Serialize(val), TimeSpan.FromSeconds(seconds));
}
ibatch.Execute();
}
}
问题解决
[1]. 连接redis集群报错:(StackExchange.Redis.dll-v1.2.1)
StackExchange.Redis.RedisConnectionException: It was not possible to connect to the redis server(s);
to create a disconnected multiplexer, disable AbortOnConnectFail. InternalFailure on PING
在 StackExchange.Redis.ConnectionMultiplexer.ConnectImpl(Func`1 multiplexerFactory, TextWriter log)
在 StackExchange.Redis.ConnectionMultiplexer.Connect(String configuration, TextWriter log)
原因:客户端dll版本与redis集群不兼容,替换为 v1.2.6 即可
管道(PipeLine)/批量(Batch)
- 命令打包,降低通信往返时延
StackExchange.Redis两个神器:ConnectionCounters 和 IProfiler
- ConnectionCounters:分析线程瞬时状态
- IProfiler:跟踪一个请求总共执行redis命令及执行时长
对StackExchange.Redis的封装,参见:
但是,V1.0版本存在 timeout的问题,超时和异步慢的问题初探解决方法:
// 解决超时
ThreadPool.SetMinThreads(xx, xx);
// 解决异步慢
connection.PreserveAsyncOrder = false;
该问题在 StackExchange.Redis 2.0 中已解决,重构了异步队列,采用管道方式解决了异步慢的问题,参见:https://www.cnblogs.com/qhca/p/9347604.html
在 StackExchange.Redis二次封装 中,建议不要用lock作为单例使用,避免出现超时问题,待验证....
应用
Log4net+redis日志队列:https://www.cnblogs.com/dissun/p/10558817.html
Redis监控:由 Opserver工具 ==> RedisMonitor
基于 Redis的 Session共享
环境配置
.NET Framework 4.5 (推荐配置)
Microsoft.Web.RedisSessionStateProvider V2.2.6
StackExchange.Redis.StrongName V1.2.1 .NET Framework 4.6.1
RedisSessionProvider V1.2.8
StackExchange.Redis V2.0.6(貌似会报错,提示用低版本V1.2.6)
使用方法
public static void RegistRedis()
{
StackExchange.Redis.ConfigurationOptions redisConfigOpts =
StackExchange.Redis.ConfigurationOptions.Parse("127.0.0.1:6379");
redisConfigOpts.Password = "********"; RedisSessionProvider.Config.RedisConnectionConfig.GetSERedisServerConfig =
(context) =>
{
return new KeyValuePair<string, StackExchange.Redis.ConfigurationOptions>(
"DefaultConnection", redisConfigOpts);
};
RedisSessionProvider.Config.RedisSessionConfig.SessionTimeout = TimeSpan.MaxValue;
}
CsRedis.Core
CsRedis 开源地址参见:https://github.com/2881099/csredis
/// .NET Framework 4.6
/// NuGet.Tools.vsix V2.12
/// CSRdeis.Core V3.0.62
CsRedis引入:https://www.cnblogs.com/kellynic/p/9803314.html
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