using StackExchange.Redis;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Web;

namespace DSWeb.Helper
{
    public static class RedisHelper
    {
        /// <summary>
        /// 根据当前web.config配置，向redis写入值
        /// </summary>
        public static void Set(string key, string content, int expireSeconds = 120)
        {
            ConnectionMultiplexer redis = ConnectionMultiplexer.Connect(ConfigurationManager.AppSettings["RedisServerAddr"]);
            var strDbIdx = ConfigurationManager.AppSettings["RedisServerDB"];
            var dbIdx = string.IsNullOrEmpty(strDbIdx) ? -1 : Convert.ToInt32(strDbIdx);
            IDatabase db = redis.GetDatabase(dbIdx);
            db.StringSet(key, content, expiry: new TimeSpan(0, 0, expireSeconds));
            redis.Close();

        }

        /// <summary>
        /// 根据当前web.config配置，从redis读取值
        /// </summary>
        /// <returns></returns>
        public static string Get(string key)
        {
            ConnectionMultiplexer redis = ConnectionMultiplexer.Connect(ConfigurationManager.AppSettings["RedisServerAddr"]);
            var strDbIdx = ConfigurationManager.AppSettings["RedisServerDB"];
            var dbIdx = string.IsNullOrEmpty(strDbIdx) ? -1 : Convert.ToInt32(strDbIdx);
            IDatabase db = redis.GetDatabase(dbIdx);

            string val = null;
            if (db.KeyExists(key))
            {
                val = db.StringGet(key);
            }
            redis.Close();

            return val;
        }
    }
}