public T Get(string key, string region)
{
key = CusKeyHelper.GetKey(_options.RedisOcelotKeyPrefix, region, key);
if (region == nameof(DiffClientRateLimitCounter) && _options.ClusterEnvironment)
{//限流且开启了集群支持，默认从redis取
return(RedisHelper.Get <T>(key));
}
var result = _cache.Get <T>(key);
if (result == null && _options.ClusterEnvironment)
{
result = RedisHelper.Get <T>(key);
if (result != null)
{
if (typeof(T) == typeof(CachedResponse))
{//查看redis过期时间
var second = RedisHelper.Ttl(key);
if (second > 0)
{
_cache.Set(key, result, TimeSpan.FromSeconds(second));
}
}
else
{
_cache.Set(key, result, TimeSpan.FromSeconds(_options.CacheTime));
}
}
}
return(result);
}
public void Add(string key, T value, TimeSpan ttl, string region)
{
key = CusKeyHelper.GetKey(_options.RedisOcelotKeyPrefix, region, key);
if (_options.ClusterEnvironment)
{
var msg = value.ToJson();
if (typeof(T) == typeof(CachedResponse))
{ //带过期时间的缓存
_cache.Set(key, value, ttl); //添加本地缓存
RedisHelper.Set(key, msg); //加入redis缓存
RedisHelper.Publish(key, msg); //发布
}
else if (typeof(T) == typeof(DiffClientRateLimitCounter?))
{//限流缓存，直接使用redis
RedisHelper.Set(key, value, (int)ttl.TotalSeconds);
}
else
{ //正常缓存,发布
_cache.Set(key, value, ttl); //添加本地缓存
RedisHelper.Set(key, msg); //加入redis缓存
RedisHelper.Publish(key, msg); //发布
}
}
else
{
_cache.Set(key, value, ttl); //添加本地缓存
}
}
/// <summary>
/// 校验完整的限流规则
/// </summary>
/// <param name="rateLimitOptions">限流配置</param>
/// <returns></returns>
private bool CheckRateLimitResult(List <DiffClientRateLimitOptions> rateLimitOptions)
{
bool result = true;
if (rateLimitOptions != null && rateLimitOptions.Count > 0)
{//校验策略
foreach (var op in rateLimitOptions)
{
var counter = new DiffClientRateLimitCounter(DateTime.UtcNow, 1);
//分别对每个策略校验
var enablePrefix = _options.RedisOcelotKeyPrefix + "RateLimitRule";
var key = CusKeyHelper.ComputeCounterKey(enablePrefix, op.ClientId, op.Period, op.RateLimitPath);
var periodTimestamp = CusKeyHelper.ConvertToSecond(op.Period);
lock (_processLocker)
{
var rateLimitCounter = _clientRateLimitCounter.Get(key, enablePrefix);
if (rateLimitCounter.HasValue)
{//提取当前的计数情况
// 请求次数增长
var totalRequests = rateLimitCounter.Value.TotalRequests + 1;
// 深拷贝
counter = new DiffClientRateLimitCounter(rateLimitCounter.Value.Timestamp, totalRequests);
}
else
{//写入限流策略
_clientRateLimitCounter.Add(key, counter, TimeSpan.FromSeconds(periodTimestamp), enablePrefix);
}
}
if (counter.TotalRequests > op.Limit)
{//更新请求记录，并标记为失败
result = false;
}
if (counter.TotalRequests > 1 && counter.TotalRequests <= op.Limit)
{//更新缓存配置信息
//获取限流剩余时间
var cur = (int)(counter.Timestamp.AddSeconds(periodTimestamp) - DateTime.UtcNow).TotalSeconds;
_clientRateLimitCounter.Add(key, counter, TimeSpan.FromSeconds(cur), enablePrefix);
}
}
}
return(result);
}
/// <summary>
/// 校验当前的请求地址客户端是否有权限访问
/// </summary>
/// <param name="clientid">客户端ID</param>
/// <param name="path">请求地址</param>
/// <returns></returns>
public async Task <bool> CheckClientAuthenticationAsync(string clientid, string path)
{
var enablePrefix = _options.RedisOcelotKeyPrefix + "ClientAuthentication";
var key = CusKeyHelper.ComputeCounterKey(enablePrefix, clientid, "", path);
var cacheResult = _ocelotCache.Get(key, enablePrefix);
if (cacheResult != null)
{//提取缓存数据
return(cacheResult.Role);
}
else
{//重新获取认证信息
var result = await _clientAuthenticationRepository.ClientAuthenticationAsync(clientid, path);
//添加到缓存里
_ocelotCache.Add(key, new ClientRoleModel()
{
CacheTime = DateTime.Now, Role = result
}, TimeSpan.FromMinutes(_options.CacheTime), enablePrefix);
return(result);
}
}
