Redis 过期不起作用 [英] Redis Expire does not work
问题描述
我使用 ServiceStack.Redis(从最新来源构建:https://github.com/ServiceStack/ServiceStack.Redis/tree/master/src).
I use ServiceStack.Redis (build from the latest sources: https://github.com/ServiceStack/ServiceStack.Redis/tree/master/src).
我做这样的事情:
CacheRecord foundKey = cacheRecords.GetById(p_sParentKey);
...
CacheRecord cacheRecord = cacheRecords.Store(foundKey);
...
redisClient.Expire(p_sParentKey, validityPeriodInMinutes * 60);
我尝试使用调试Console.WriteLine(cacheRecords.GetTimeToLive(p_sParentKey)); 返回 -00:00:01.我分配给validityPeriodInMinutes 哪个值并不重要.
i tried to debug using
Console.WriteLine(cacheRecords.GetTimeToLive(p_sParentKey)); which returns -00:00:01.
it doesnt matter which value i assign to validityPeriodInMinutes.
我也试过Expire、ExpireAt、ExpireEntryAt、ExpireEntryIn.我也试过这样的:
I tried aswell Expire, ExpireAt, ExpireEntryAt, ExpireEntryIn. I also tried something like this:
int epoch = (int)(DateTime.UtcNow.AddSeconds(validityPeriodInMinutes) - new DateTime(1970, 1, 1)).TotalSeconds;
redisClient.ExpireAt(p_sParentKey, epoch);
有什么想法吗?
[Serializable]
public class CacheRecord
{
public CacheRecord()
{
this.Children = new List<CacheRecordChild>();
}
public string Id { get; set; }
public List<CacheRecordChild> Children { get; set; }
}
#endregion
#region public class CacheRecordChild
[Serializable]
public class CacheRecordChild
{
public string Id { get; set; }
public string Data { get; set; }
}
public void AddKey(string p_sParentKey, string p_sChildKey, string p_sData, int validityPeriodInMinutes)
{
using (ServiceStack.Redis.RedisClient redisClient = new ServiceStack.Redis.RedisClient())
{
using (var cacheRecords = redisClient.GetTypedClient<CacheRecord>())
{
CacheRecord foundKey = cacheRecords.GetById(p_sParentKey);
if (foundKey == null)
{
foundKey = new CacheRecord();
foundKey.Id = p_sParentKey;
CacheRecordChild child = new CacheRecordChild();
child.Id = p_sChildKey;
child.Data = p_sData;
foundKey.Children.Add(child);
CacheRecord cacheRecord = cacheRecords.Store(foundKey);
//redisClient.Expire(p_sParentKey, validityPeriodInMinutes);
redisClient.Expire(p_sParentKey, validityPeriodInMinutes * 60);
}
else
{
CacheRecordChild child = new CacheRecordChild();
child.Id = p_sChildKey;
child.Data = p_sData;
foundKey.Children.Add(child);
CacheRecord cacheRecord = cacheRecords.Store(foundKey);
// redisClient.Expire(p_sParentKey, validityPeriodInMinutes);
// redisClient.Expire(p_sParentKey, validityPeriodInMinutes * 60);
// int epoch = (int)(DateTime.UtcNow.AddSeconds(validityPeriodInMinutes) - new DateTime(1970, 1, 1)).TotalSeconds;
redisClient.Expire(p_sParentKey, validityPeriodInMinutes * 60);
}
}
}
}
推荐答案
抱歉，我不能很好地阅读您的代码以了解您是否/做错了什么.
Sorry but I can't really read your code very well in order to know if/what you're doing wrong.
我对 Expire、ExpireAt 操作进行了一些测试，以下是一些可以更好地演示如何使用它的测试:
I have a fair few tests for Expire, ExpireAt operations, here are some below which may better demonstrate how to use it:
[Test]
public void Can_Expire()
{
Redis.SetEntry("key", "val");
Redis.Expire("key", 1);
Assert.That(Redis.ContainsKey("key"), Is.True);
Thread.Sleep(2000);
Assert.That(Redis.ContainsKey("key"), Is.False);
}
[Test]
public void Can_ExpireAt()
{
Redis.SetEntry("key", "val");
var unixNow = DateTime.Now.ToUnixTime();
var in1Sec = unixNow + 1;
Redis.ExpireAt("key", in1Sec);
Assert.That(Redis.ContainsKey("key"), Is.True);
Thread.Sleep(2000);
Assert.That(Redis.ContainsKey("key"), Is.False);
}
如果您仍然遇到问题，能否请您发布可运行的代码片段或要点，以便我更好地阅读您的代码.
If you're still having a problem, can you please post a runnable code snippet or gist so I can better read your code.
对代码示例的回答
当您使用类型化客户端时，最终存储在 Redis 中的密钥如下所示:
When you use a typed client, the key that ultimately gets stored in Redis looks like:
'urn:CacheRecord:' + p_sParentKey
这与您在示例中使用的键不同:
Which is a different key to what you're using in your example:
redisClient.Expire(p_sParentKey, validityPeriodInMinutes * 60);
因此，有几种方法可以获取在 Redis 中使用的 urn 密钥.如果您有实体，则可以使用 ToUrn() 扩展方法，例如
So there are a couple of ways to get the urn key that's used in Redis. If you have the entity you can use the ToUrn() Extension method, e.g.
var cacheKey = foundKey.ToUrn();
否则，如果您只有Id"，您可以创建urn 键，例如:
Otherwise if you just have the 'Id', you can create the urn key like:
var cacheKey = IdUtils.CreateUrn<CacheRecord>(p_sParentKey);
从那里您可以使您的条目过期:
From there you can expire your entry:
redisClient.Expire(cacheKey, validityPeriodInMinutes * 60);
虽然我明白这不是直观的，所以我会在未来的版本中添加一个 RedisTypedClient.ExpiryIn 方法，它会自动为你做这件事.这应该让你做类似的事情:
Although I understand how this is not intuitive, so I will look to add a RedisTypedClient.ExpiryIn method in a future version which would do this automatically for you. this should then let you do something like:
cacheRecords.ExpireIn(p_sParentKey, TimeSpan.FromMinutes(validityPeriodInMinutes));
添加方法重载:
我在最新版本的 Redis Client (v2.07) 中添加了上述方法，您可以在这里下载:https://github.com/ServiceStack/ServiceStack.Redis/downloads
I've added the method above in the latest version of the Redis Client (v2.07) which you can download here: https://github.com/ServiceStack/ServiceStack.Redis/downloads
顺便说一句:Redis 客户端实际上并不需要 [Serializer] 属性.
BTW: the Redis Client doesn't actually need [Serializer] attribute.
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