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src/Momento.Sdk/CacheClient.cs

@@ -84,7 +84,7 @@ public async Task<ListCachesResponse> ListCachesAsync()
     }
 
     /// <inheritdoc />
-    async Task<CacheKeyExistsResponse> ICacheClient.KeyExistsAsync(string cacheName, byte[] key)
+    public async Task<CacheKeyExistsResponse> KeyExistsAsync(string cacheName, byte[] key)
     {
         try
         {
@@ -99,7 +99,7 @@ async Task<CacheKeyExistsResponse> ICacheClient.KeyExistsAsync(string cacheName,
     }
 
     /// <inheritdoc />
-    async Task<CacheKeyExistsResponse> ICacheClient.KeyExistsAsync(string cacheName, string key)
+    public async Task<CacheKeyExistsResponse> KeyExistsAsync(string cacheName, string key)
     {
         try
         {
@@ -114,7 +114,7 @@ async Task<CacheKeyExistsResponse> ICacheClient.KeyExistsAsync(string cacheName,
     }
 
     /// <inheritdoc />
-    async Task<CacheKeysExistResponse> ICacheClient.KeysExistAsync(string cacheName, IEnumerable<byte[]> keys)
+    public async Task<CacheKeysExistResponse> KeysExistAsync(string cacheName, IEnumerable<byte[]> keys)
     {
         try
         {
@@ -130,7 +130,7 @@ async Task<CacheKeysExistResponse> ICacheClient.KeysExistAsync(string cacheName,
     }
 
     /// <inheritdoc />
-    async Task<CacheKeysExistResponse> ICacheClient.KeysExistAsync(string cacheName, IEnumerable<string> keys)
+    public async Task<CacheKeysExistResponse> KeysExistAsync(string cacheName, IEnumerable<string> keys)
     {
         try
         {
@@ -145,6 +145,45 @@ async Task<CacheKeysExistResponse> ICacheClient.KeysExistAsync(string cacheName,
         return await this.DataClient.KeysExistAsync(cacheName, keys);
     }
 
+    /// <inheritdoc />
+    public async Task<CacheUpdateTtlResponse> UpdateTtlAsync(string cacheName, byte[] key, TimeSpan ttl)
+    {
+        try
+        {
+            Utils.ArgumentNotNull(cacheName, nameof(cacheName));
+            Utils.ArgumentNotNull(key, nameof(key));
+            Utils.ArgumentStrictlyPositive(ttl, nameof(ttl));
+        }
+        catch (ArgumentNullException e)
+        {
+            return new CacheUpdateTtlResponse.Error(new InvalidArgumentException(e.Message));
+        }
+        catch (ArgumentOutOfRangeException e)
+        {
+            return new CacheUpdateTtlResponse.Error(new InvalidArgumentException(e.Message));
+        }
+        return await this.DataClient.UpdateTtlAsync(cacheName, key, ttl);
+    }
+
+    /// <inheritdoc />
+    public async Task<CacheUpdateTtlResponse> UpdateTtlAsync(string cacheName, string key, TimeSpan ttl)
+    {
+        try
+        {
+            Utils.ArgumentNotNull(cacheName, nameof(cacheName));
+            Utils.ArgumentNotNull(key, nameof(key));
+            Utils.ArgumentStrictlyPositive(ttl, nameof(ttl));
+        }
+        catch (ArgumentNullException e)
+        {
+            return new CacheUpdateTtlResponse.Error(new InvalidArgumentException(e.Message));
+        }
+        catch (ArgumentOutOfRangeException e)
+        {
+            return new CacheUpdateTtlResponse.Error(new InvalidArgumentException(e.Message));
+        }
+        return await this.DataClient.UpdateTtlAsync(cacheName, key, ttl);
+    }
 
     /// <inheritdoc />
     public async Task<CacheSetResponse> SetAsync(string cacheName, byte[] key, byte[] value, TimeSpan? ttl = null)

src/Momento.Sdk/ICacheClient.cs

@@ -160,6 +160,17 @@ public interface ICacheClient : IDisposable
     /// <inheritdoc cref="KeysExistAsync(string, IEnumerable{byte[]})"/>
     public Task<CacheKeysExistResponse> KeysExistAsync(string cacheName, IEnumerable<string> keys);
 
+    /// <summary>
+    /// Overwrites the TTL of a cache item with the provided TTL.
+    /// </summary>
+    /// <param name="cacheName">The name of the cache to perform the lookup in.</param>
+    /// <param name="key">The key to update the TTL for.</param>
+    /// <param name="ttl">The new TTL for the item.</param>
+    /// <returns>Task representing the result of the update TTL operation.</returns>
+    public Task<CacheUpdateTtlResponse> UpdateTtlAsync(string cacheName, byte[] key, TimeSpan ttl);
+
+    /// <inheritdoc cref="UpdateTtlAsync(string, byte[], TimeSpan)"/>
+    public Task<CacheUpdateTtlResponse> UpdateTtlAsync(string cacheName, string key, TimeSpan ttl);
 
     /// <summary>
     /// Set the value in cache with a given time to live (TTL) seconds.

src/Momento.Sdk/Internal/DataGrpcManager.cs

@@ -23,6 +23,7 @@ namespace Momento.Sdk.Internal;
 public interface IDataClient
 {
     public Task<_KeysExistResponse> KeysExistAsync(_KeysExistRequest request, CallOptions callOptions);
+    public Task<_UpdateTtlResponse> UpdateTtlAsync(_UpdateTtlRequest request, CallOptions callOptions);
     public Task<_GetResponse> GetAsync(_GetRequest request, CallOptions callOptions);
     public Task<_SetResponse> SetAsync(_SetRequest request, CallOptions callOptions);
     public Task<_DeleteResponse> DeleteAsync(_DeleteRequest request, CallOptions callOptions);
@@ -74,6 +75,12 @@ public async Task<_KeysExistResponse> KeysExistAsync(_KeysExistRequest request,
         return await wrapped.ResponseAsync;
     }
 
+    public async Task<_UpdateTtlResponse> UpdateTtlAsync(_UpdateTtlRequest request, CallOptions callOptions)
+    {
+        var wrapped = await _middlewares.WrapRequest(request, callOptions, (r, o) => _generatedClient.UpdateTtlAsync(r, o));
+        return await wrapped.ResponseAsync;
+    }
+
     public async Task<_DeleteResponse> DeleteAsync(_DeleteRequest request, CallOptions callOptions)
     {
         var wrapped = await _middlewares.WrapRequest(request, callOptions, (r, o) => _generatedClient.DeleteAsync(r, o));

src/Momento.Sdk/Internal/ScsDataClient.cs

@@ -96,6 +96,16 @@ public async Task<CacheKeysExistResponse> KeysExistAsync(string cacheName, IEnum
         return await this.SendKeysExistAsync(cacheName, keys: keys.ToEnumerableByteString());
     }
 
+    public async Task<CacheUpdateTtlResponse> UpdateTtlAsync(string cacheName, byte[] key, TimeSpan ttl)
+    {
+        return await this.SendUpdateTtlAsync(cacheName, key: key.ToByteString(), ttl: ttl);
+    }
+
+    public async Task<CacheUpdateTtlResponse> UpdateTtlAsync(string cacheName, string key, TimeSpan ttl)
+    {
+        return await this.SendUpdateTtlAsync(cacheName, key: key.ToByteString(), ttl: ttl);
+    }
+
     public async Task<CacheSetResponse> SetAsync(string cacheName, byte[] key, byte[] value, TimeSpan? ttl = null)
     {
         return await this.SendSetAsync(cacheName, key: key.ToByteString(), value: value.ToByteString(), ttl: ttl);
@@ -412,6 +422,42 @@ private async Task<CacheKeysExistResponse> SendKeysExistAsync(string cacheName,
         return this._logger.LogTraceRequestSuccess(REQUEST_TYPE_KEYS_EXIST, cacheName, keys.ToString().ToByteString(), null, null, new CacheKeysExistResponse.Success(keys, response));
     }
 
+    const string REQUEST_TYPE_UPDATE_TTL = "UPDATE_TTL";
+    private async Task<CacheUpdateTtlResponse> SendUpdateTtlAsync(string cacheName, ByteString key, TimeSpan ttl)
+    {
+        _UpdateTtlRequest request = new _UpdateTtlRequest()
+        {
+            CacheKey = key,
+            OverwriteToMilliseconds = TtlToMilliseconds(ttl)
+        };
+        _UpdateTtlResponse response;
+        var metadata = MetadataWithCache(cacheName);
+        try
+        {
+            this._logger.LogTraceExecutingRequest(REQUEST_TYPE_UPDATE_TTL, cacheName, key, null, ttl);
+            response = await this.grpcManager.Client.UpdateTtlAsync(request, new CallOptions(headers: metadata, deadline: CalculateDeadline()));
+        }
+        catch (Exception e)
+        {
+            return this._logger.LogTraceRequestError(REQUEST_TYPE_UPDATE_TTL, cacheName, key, null, ttl, new CacheUpdateTtlResponse.Error(_exceptionMapper.Convert(e, metadata)));
+        }
+
+        if (response.ResultCase == _UpdateTtlResponse.ResultOneofCase.Set)
+        {
+            return this._logger.LogTraceRequestSuccess(REQUEST_TYPE_UPDATE_TTL, cacheName, key, null, ttl, new CacheUpdateTtlResponse.Set());
+        }
+        else if (response.ResultCase == _UpdateTtlResponse.ResultOneofCase.Missing)
+        {
+            return this._logger.LogTraceRequestSuccess(REQUEST_TYPE_UPDATE_TTL, cacheName, key, null, ttl, new CacheUpdateTtlResponse.Miss());
+        }
+        else
+        {
+            // The other alternative is "NotSet", which is impossible when doing OverwriteTtl.
+            return this._logger.LogTraceRequestError(REQUEST_TYPE_UPDATE_TTL, cacheName, key, null, ttl, new CacheUpdateTtlResponse.Error(
+                _exceptionMapper.Convert(new Exception("Unknown response type"), metadata)));
+        }
+    }
+
     const string REQUEST_TYPE_SET = "SET";
     private async Task<CacheSetResponse> SendSetAsync(string cacheName, ByteString key, ByteString value, TimeSpan? ttl = null)
     {
@@ -1058,7 +1104,7 @@ private async Task<CacheListFetchResponse> SendListFetchAsync(string cacheName,
 
         return this._logger.LogTraceCollectionRequestSuccess(REQUEST_TYPE_LIST_FETCH, cacheName, listName, new CacheListFetchResponse.Miss());
     }
-    
+
     const string REQUEST_TYPE_LIST_RETAIN = "LIST_RETAIN";
     private async Task<CacheListRetainResponse> SendListRetainAsync(string cacheName, string listName, int? startIndex, int? endIndex)
     {
@@ -1095,7 +1141,7 @@ private async Task<CacheListRetainResponse> SendListRetainAsync(string cacheName
 
         return this._logger.LogTraceCollectionRequestSuccess(REQUEST_TYPE_LIST_RETAIN, cacheName, listName, new CacheListRetainResponse.Success());
     }
-    
+
     const string REQUEST_TYPE_LIST_REMOVE_VALUE = "LIST_REMOVE_VALUE";
     private async Task<CacheListRemoveValueResponse> SendListRemoveValueAsync(string cacheName, string listName, ByteString value)
     {

src/Momento.Sdk/Momento.Sdk.csproj

@@ -54,7 +54,7 @@
 	</ItemGroup>
 	<ItemGroup>
 	  <PackageReference Include="Grpc.Net.Client" Version="2.49.0" />
-	  <PackageReference Include="Momento.Protos" Version="0.51.1" />
+	  <PackageReference Include="Momento.Protos" Version="0.60.1" />
 	  <PackageReference Include="JWT" Version="9.0.3" />
 	  <PackageReference Include="System.Threading.Channels" Version="6.0.0" />
 	  <PackageReference Include="Microsoft.Extensions.Logging" Version="6.0.0" />

src/Momento.Sdk/Responses/CacheUpdateTtlResponse.cs

@@ -0,0 +1,78 @@
+namespace Momento.Sdk.Responses;
+
+using Momento.Sdk.Exceptions;
+
+
+/// <summary>
+/// Parent response type for a cache update ttl request. The
+/// response object is resolved to a type-safe object of one of
+/// the following subtypes:
+/// <list type="bullet">
+/// <item><description>CacheUpdateTtlResponse.Set</description></item>
+/// <item><description>CacheUpdateTtlResponse.Miss</description></item>
+/// <item><description>CacheUpdateTtlResponse.Error</description></item>
+/// </list>
+/// Pattern matching can be used to operate on the appropriate subtype.
+/// For example:
+/// <code>
+/// if (response is CacheUpdateTtlResponse.Set setResponse)
+/// {
+///    // handle ttl updated as appropriate
+/// }
+/// else if (response is CacheUpdateTtlResponse.Miss missResponse)
+/// {
+///    // handle ttl not updated because key was not found as appropriate
+/// }
+/// else if (response is CacheUpdateTtlResponse.Error errorResponse)
+/// {
+///   // handle error as appropriate
+///   return errorResponse.Message;
+/// }
+/// else
+/// {
+///   // handle unexpected response
+/// }
+/// </code>
+/// </summary>
+public abstract class CacheUpdateTtlResponse
+{
+    /// <summary>
+    /// Indicates the key was found in the cache and the ttl was updated.
+    /// </summary>
+    public class Set : CacheUpdateTtlResponse { }
+
+    /// <summary>
+    /// Indicates the key was not found in the cache, hence the ttl was not updated.
+    /// </summary>
+    public class Miss : CacheUpdateTtlResponse { }
+
+    /// <include file = "../docs.xml" path='docs/class[@name="Error"]/description/*' />
+    public class Error : CacheUpdateTtlResponse, IError
+    {
+        private readonly SdkException _error;
+
+        /// <include file = "../docs.xml" path='docs/class[@name="Error"]/constructor/*' />
+        public Error(SdkException error)
+        {
+            _error = error;
+        }
+
+        /// <inheritdoc />
+        public SdkException InnerException
+        {
+            get => _error;
+        }
+
+        /// <inheritdoc />
+        public MomentoErrorCode ErrorCode
+        {
+            get => _error.ErrorCode;
+        }
+
+        /// <inheritdoc />
+        public string Message
+        {
+            get => _error.Message;
+        }
+    }
+}