Clear Azure Cache : Get All keys in Azure Redis cache

 

Recently I got a requirement to clear cache value for a given client account. In our systems we have multiple contractors , and we cache some data related to that contractor account. Cache keys are as follows.

1. string.Format("{0}:ServiceTypeList", clientConfiguration.Code);
2.       string.Format("{0}:PropertyViewModelList", clientConfiguration.Code);
3.       string.Format("{0}-{1}:FaultTypeList", clientConfiguration.Code,
4.                     serviceType.ServiceTypeID);
5.       string.Format("{0}-{1}:LocationList", clientConfiguration.Code,
6.                     property.PropertyNo);

Here some cache keys are based on Client Configuration code, and some have client configuration and some code too. But when we have to clear the cache for a given client account we have only the Client Configuration code. So we used the following approach.

1. Get all Cache Keys

1. private static ConnectionMultiplexer _connection;
2.  
3. public static IServer GetDataCacheServer()
4. {
5.     if (_connection == null || !_connection.IsConnected)
6.     {
7.         _connection = ConnectionMultiplexer.Connect(HybridConfig.GetAppSetting("RedisCacheConnectionString"));
8.     }
9.  
10.  
11.     var endpoints = _connection.GetEndPoints();
12.     var server = _connection.GetServer(endpoints.First());
13.     return server;
14.  
15. }
16.  
17.  
18. public static IEnumerable<RedisKey> GetAllCacheKeys()
19. {
20.     var server = GetDataCacheServer();
21.  
22.     var keys = server.Keys();
23.     return keys;
24. }

2. Create Remove method

1. public static void Remove(string key)
2.         {
3.            
4.  
5.             try
6.             {
7.                 key = string.Format("{0}_{1}_{2}", key, HybridConfig.GetAppSetting("ApplicationUrl"), HybridConfig.GetAppSetting("ApplicationVersion"));
8.                 var database = GetDataCache();
9.                 database.KeyDelete(key);
10.              
11.                 if (AllKeys.Contains(key))
12.                 {
13.                     AllKeys.Remove(key);
14.                 }
15.             }
16.             catch (Exception ex)
17.             {
18.                 SqlLogger.Error(typeof(AzureCache), string.Format("Error while trying to remove the key : {0} | Message : {1}", key, ex.Message), ex);
19.             }
20.         }

3. Search the client configuration code in it and clear the cache

            var keys = AzureCache.GetAllCacheKeys();
            string applicationTag = string.Format("_{0}_{1}", HybridConfig.GetAppSetting("ApplicationUrl"),
                                                  HybridConfig.GetAppSetting("ApplicationVersion"));
            List<string> cacheKeys = (from redisKey in keys
                                      select redisKey.ToString()
                                      into key
                                      where key.Contains(applicationTag) && key.Contains(clientConfiguration.Code)
                                      select key.Replace(applicationTag, string.Empty)).ToList();
            if (cacheKeys.Any())
            cacheKeys.ForEach(AzureCache.Remove);

Happy Coding !!!