➕ Add getFeeForMessage (#40)

src/Solana.Unity.Rpc/IRpcClient.cs

@@ -239,6 +239,15 @@ Task<RequestResult<ResponseValue<FeeCalculatorInfo>>> GetFeeCalculatorForBlockha
         /// <returns>Returns a task that holds the asynchronous operation result and state.</returns>
         Task<RequestResult<ResponseValue<FeesInfo>>> GetFeesAsync(Commitment commitment = default);
 
+        /// <summary>
+        /// Sends a transaction.
+        /// </summary>
+        /// <param name="message">The transaction message</param>
+        /// <param name="commitment">The block commitment used to retrieve block hashes and verify success.</param>
+        /// <returns>Returns a task that holds the asynchronous operation result and state.</returns>
+        Task<RequestResult<ResponseValue<ulong?>>> GetFeeForMessageAsync(byte[] message, Commitment commitment = default);
+
+
         /// <summary>
         /// Returns the slot of the lowest confirmed block that has not been purged from the ledger.
         /// </summary>

src/Solana.Unity.Rpc/Models/Fees.cs

@@ -1,3 +1,5 @@
+using Newtonsoft.Json;
+
 namespace Solana.Unity.Rpc.Models
 {
     /// <summary>
@@ -67,4 +69,16 @@ public class FeesInfo
         /// </summary>
         public ulong LastValidBlockHeight { get; set; }
     }
+
+    /// <summary>
+    /// Represents the message fees.
+    /// </summary>
+    public class MessageFeesInfo
+    {
+
+        /// <summary>
+        /// Fee corresponding to the message at the specified blockhash
+        /// </summary>
+        public ulong Value { get; set; }
+    }
 }

src/Solana.Unity.Rpc/SolanaRpcClient.cs

@@ -552,7 +552,20 @@ public async Task<RequestResult<ResponseValue<FeesInfo>>> GetFeesAsync(
             return await SendRequestAsync<ResponseValue<FeesInfo>>("getFees",
                 Parameters.Create(ConfigObject.Create(HandleCommitment(commitment))));
         }
-
+
+        /// <inheritdoc cref="IRpcClient.GetFeeForMessageAsync(byte[], Commitment)"/>
+        public async Task<RequestResult<ResponseValue<ulong?>>> GetFeeForMessageAsync(
+            byte[] message, 
+            Commitment commitment = default)
+        {
+            return await SendRequestAsync<ResponseValue<ulong?>>("getFeeForMessage",
+                Parameters.Create(
+                    Convert.ToBase64String(message),
+                    ConfigObject.Create(
+                        KeyValue.Create("commitment", commitment)
+                    )
+                ));
+        }
 
         /// <inheritdoc cref="IRpcClient.GetFees"/>
         public RequestResult<ResponseValue<FeesInfo>> GetFees(Commitment commitment = default)

test/Solana.Unity.Rpc.Test/Resources/Http/Fees/GetMessageFeesRequest.json

@@ -0,0 +1 @@
+{"method":"getFeeForMessage","params":["AQABAgIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEBAQAA",{"commitment":"processed"}],"jsonrpc":"2.0","id":0}

test/Solana.Unity.Rpc.Test/Resources/Http/Fees/GetMessageFeesResponse.json

@@ -0,0 +1,11 @@
+{
+  "jsonrpc": "2.0",
+  "result": {
+    "context": {
+      "apiVersion": "1.14.20",
+      "slot": 206417151
+    },
+    "value": 5000
+  },
+  "id": 0
+}

test/Solana.Unity.Rpc.Test/Solana.Unity.Rpc.Test.csproj

@@ -591,6 +591,12 @@
     <None Update="Resources\Http\Fees\GetFeesResponse.json">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
+    <None Update="Resources\Http\Fees\GetMessageFeesRequest.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="Resources\Http\Fees\GetMessageFeesResponse.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
     <None Update="Resources\Http\Epoch\GetEpochScheduleResponse.json">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
@@ -687,6 +693,12 @@
     <None Update="Resources\Http\Signatures\GetConfirmedSignaturesForAddress2BeforeConfirmedRequest.json">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
+    <None Update="Resources\Http\Fees\GetMessageFeesRequest.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="Resources\Http\Fees\GetMessageFeesResponse.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
   </ItemGroup>
 
 </Project>

test/Solana.Unity.Rpc.Test/SolanaRpcClientFeeTests.cs

@@ -73,6 +73,33 @@ public void TestGetFees()
 
             FinishTest(messageHandlerMock, TestnetUri);
         }
+
+        [TestMethod]
+        public async Task TestGetMessageFees()
+        {
+            var message = "AQABAgIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAA" +
+                          "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEBAQAA";
+            var responseData = File.ReadAllText("Resources/Http/Fees/GetMessageFeesResponse.json");
+            var requestData = File.ReadAllText("Resources/Http/Fees/GetMessageFeesRequest.json");
+            var sentMessage = string.Empty;
+            var messageHandlerMock = SetupTest(
+                (s => sentMessage = s), responseData);
+
+            var httpClient = new HttpClient(messageHandlerMock.Object)
+            {
+                BaseAddress = TestnetUri,
+            };
+
+            var sut = new SolanaRpcClient(TestnetUrl, null, httpClient);
+            var result = await sut.GetFeeForMessageAsync(message: Convert.FromBase64String(message), Commitment.Processed);
+
+            Assert.AreEqual(requestData, sentMessage);
+            Assert.IsNotNull(result.Result);
+            Assert.IsTrue(result.WasSuccessful);
+            Assert.AreEqual(5000UL, result.Result.Value);
+
+            FinishTest(messageHandlerMock, TestnetUri);
+        }
 
         [TestMethod]
         public void TestGetFeesConfirmed()