/// <summary>
/// 连接到指定的Sentinel，获取 master 和 slave 信息并返回。同时，注册相应的事件用于接收 sentinel 的通知消息
/// </summary>
/// <returns></returns>
public string Start()
{
var redisConnectionString = string.Empty;
try
{
// redis在哨兵模式下，如果Password不为null 或 ""，会使用 AUTH 命令，但这个命令是不可用的。
// 所以，克隆一个配置，并将其 Password信息去除
ConfigurationOptions finalSentinalConfig = SentinelConfig;
if (!string.IsNullOrWhiteSpace(SentinelConfig.Password))
{
var cloneConfig = SentinelConfig.Clone();
cloneConfig.Password = "";
finalSentinalConfig = cloneConfig;
}
SentinelConnection = ConnectionMultiplexer.Connect(finalSentinalConfig);
redisConnectionString = GetConnectionStringFromSentinel();
_Sentinelsub = SentinelConnection.GetSubscriber();
_Sentinelsub.SubscribeAsync("+switch-master", (channle, msg) =>
{
redisConnectionString = GetConnectionStringFromSentinel();
RaiseOnRedisServerChanged(_Section, redisConnectionString, PoolSize);
});
}
catch (Exception ex)
{
throw new Exception(string.Format("SESentinelClient.Start 连接到哨兵服务器（{0}）失败：{1}", SentinelConfig, ex.Message));
}
return(redisConnectionString);
}
/// <summary>
/// 初始化哨兵类
/// </summary>
/// <param name="section"></param>
/// <param name="connectionStr"></param>
/// <param name="poolSize"></param>
/// <param name="password"></param>
public SESentinelClient(string section, string connectionStr, int poolSize, string password)
{
if (SentinelConnection != null)
{
SentinelConnection.Dispose();
}
_Section = section;
SentinelConfig = ConfigurationOptions.Parse(connectionStr);
SentinelConfig.TieBreaker = string.Empty;
SentinelConfig.CommandMap = CommandMap.Sentinel;
PoolSize = poolSize;
_password = password;
}
/// <summary>
/// 根据当前哨兵获取对应redis实例的连接字符串
/// </summary>
/// <returns></returns>
private string GetConnectionStringFromSentinel()
{
try
{
var activeSentinelServer = GetActiveServer(SentinelConnection, SentinelConnection.GetEndPoints());
var masterConnectionInfo = activeSentinelServer.SentinelGetMasterAddressByName(SentinelConfig.ServiceName);
var slaveConnectionInfos =
SanitizeHostsConfig(activeSentinelServer.SentinelSlaves(SentinelConfig.ServiceName));
var redisConfigs = new ConfigurationOptions
{
AllowAdmin = true,
DefaultDatabase = SentinelConfig.DefaultDatabase,
ConnectRetry = SentinelConfig.ConnectRetry,
ConnectTimeout = SentinelConfig.ConnectTimeout,
KeepAlive = SentinelConfig.KeepAlive,
SyncTimeout = SentinelConfig.SyncTimeout,
AbortOnConnectFail = false
};
if (!string.IsNullOrEmpty(_password))
{
redisConfigs.Password = _password;
}
redisConfigs.EndPoints.Add(masterConnectionInfo);
foreach (var slaveInfo in slaveConnectionInfos)
{
redisConfigs.EndPoints.Add(slaveInfo);
}
return(redisConfigs.ToString());
}
catch (Exception ex)
{
throw new Exception(string.Format("SESentinelClient.GetConnectionStringFromSentinel 连接到哨兵服务器（{0}）失败：{1}", SentinelConfig, ex.Message));
}
}
