Exclude empty outputs in requests

src/Nethermind/Nethermind.Consensus/ExecutionRequests/ExecutionRequestProcessor.cs

@@ -1,6 +1,7 @@
 // SPDX-FileCopyrightText: 2024 Demerzel Solutions Limited
 // SPDX-License-Identifier: LGPL-3.0-only
 
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -54,12 +55,15 @@ public ExecutionRequestsProcessor(ITransactionProcessor transactionProcessor)
         _consolidationTransaction.Hash = _consolidationTransaction.CalculateHash();
     }
 
-    public byte[] ProcessDeposits(TxReceipt[] receipts, IReleaseSpec spec)
+    public void ProcessDeposits(TxReceipt[] receipts, IReleaseSpec spec, ArrayPoolList<byte[]> requests)
     {
         if (!spec.DepositsEnabled)
-            return [];
+            return;
 
-        using ArrayPoolList<byte> depositRequests = new(receipts.Length * 2);
+        using ArrayPoolList<byte> depositRequests = new(receipts.Length * 2 + 1)
+        {
+            (byte)ExecutionRequestType.Deposit
+        };
 
         for (int i = 0; i < receipts.Length; i++)
         {
@@ -79,7 +83,8 @@ public byte[] ProcessDeposits(TxReceipt[] receipts, IReleaseSpec spec)
             }
         }
 
-        return depositRequests.ToArray();
+        if (depositRequests.Count > 1)
+            requests.Add(depositRequests.ToArray());
     }
 
     private void DecodeDepositRequest(LogEntry log, Span<byte> buffer)
@@ -107,34 +112,45 @@ private void DecodeDepositRequest(LogEntry log, Span<byte> buffer)
         }
     }
 
-
-    private byte[] ReadRequests(Block block, IWorldState state, IReleaseSpec spec, Address contractAddress)
+    private void ReadRequests(Block block, IWorldState state, IReleaseSpec spec, Address contractAddress, ArrayPoolList<byte[]> requests)
     {
         bool isWithdrawalRequests = contractAddress == spec.Eip7002ContractAddress;
 
         int requestsByteSize = isWithdrawalRequests ? ExecutionRequestExtensions.WithdrawalRequestsBytesSize : ExecutionRequestExtensions.ConsolidationRequestsBytesSize;
 
         if (!(isWithdrawalRequests ? spec.WithdrawalRequestsEnabled : spec.ConsolidationRequestsEnabled) || !state.AccountExists(contractAddress))
-            return [];
+            return;
 
         CallOutputTracer tracer = new();
 
         _transactionProcessor.Execute(isWithdrawalRequests ? _withdrawalTransaction : _consolidationTransaction, new BlockExecutionContext(block.Header), tracer);
 
         if (tracer.ReturnValue is null || tracer.ReturnValue.Length == 0)
         {
-            return [];
+            return;
         }
 
         int validLength = tracer.ReturnValue.Length - (tracer.ReturnValue.Length % requestsByteSize);
-        return tracer.ReturnValue.AsSpan(0, validLength).ToArray();
+
+        if (validLength == 0) return;
+
+        Span<byte> buffer = stackalloc byte[validLength + 1];
+        buffer[0] = isWithdrawalRequests ? (byte)ExecutionRequestType.WithdrawalRequest : (byte)ExecutionRequestType.ConsolidationRequest;
+        tracer.ReturnValue.AsSpan(0, validLength).CopyTo(buffer.Slice(1));
+        requests.Add(buffer.ToArray());
     }
 
     public void ProcessExecutionRequests(Block block, IWorldState state, TxReceipt[] receipts, IReleaseSpec spec)
     {
         if (!spec.RequestsEnabled)
             return;
-        block.ExecutionRequests = new byte[][] { ProcessDeposits(receipts, spec), ReadRequests(block, state, spec, spec.Eip7002ContractAddress), ReadRequests(block, state, spec, spec.Eip7251ContractAddress) };
+
+        using ArrayPoolList<byte[]> requests = new(3);
+
+        ProcessDeposits(receipts, spec, requests);
+        ReadRequests(block, state, spec, spec.Eip7002ContractAddress, requests);
+        ReadRequests(block, state, spec, spec.Eip7251ContractAddress, requests);
+        block.ExecutionRequests = requests.ToArray();
         block.Header.RequestsHash = ExecutionRequestExtensions.CalculateHashFromFlatEncodedRequests(block.ExecutionRequests);
     }
 }

src/Nethermind/Nethermind.Core.Test/Builders/TestExecutionRequest.cs

@@ -1,7 +1,6 @@
 // SPDX-FileCopyrightText: 2024 Demerzel Solutions Limited
 // SPDX-License-Identifier: LGPL-3.0-only
 
-using System;
 using System.Linq;
 using Nethermind.Core.Collections;
 using Nethermind.Core.ExecutionRequest;
@@ -19,7 +18,7 @@ public byte[][]? RequestDataParts
         set
         {
             _requestDataParts = value;
-            RequestData = value is null ? null : Bytes.Concat(value.AsSpan());
+            RequestData = value is null ? null : Bytes.Concat(value);
         }
     }
 }
@@ -32,18 +31,30 @@ public static ArrayPoolList<byte[]> GetFlatEncodedRequests(
         TestExecutionRequest[] consolidationRequests
     )
     {
-        return new(ExecutionRequestExtensions.RequestPartsCount)
+        var result = new ArrayPoolList<byte[]>(ExecutionRequestExtensions.MaxRequestsCount);
+
+        if (depositRequests.Length > 0)
         {
-            FlatEncodeRequests(depositRequests, depositRequests.Length * ExecutionRequestExtensions.DepositRequestsBytesSize),
-            FlatEncodeRequests(withdrawalRequests, withdrawalRequests.Length * ExecutionRequestExtensions.WithdrawalRequestsBytesSize),
-            FlatEncodeRequests(consolidationRequests, consolidationRequests.Length * ExecutionRequestExtensions.ConsolidationRequestsBytesSize)
-        };
+            result.Add(FlatEncodeRequests(depositRequests, depositRequests.Length * ExecutionRequestExtensions.DepositRequestsBytesSize, (byte)ExecutionRequestType.Deposit));
+        }
+
+        if (withdrawalRequests.Length > 0)
+        {
+            result.Add(FlatEncodeRequests(withdrawalRequests, withdrawalRequests.Length * ExecutionRequestExtensions.WithdrawalRequestsBytesSize, (byte)ExecutionRequestType.WithdrawalRequest));
+        }
+
+        if (consolidationRequests.Length > 0)
+        {
+            result.Add(FlatEncodeRequests(consolidationRequests, consolidationRequests.Length * ExecutionRequestExtensions.ConsolidationRequestsBytesSize, (byte)ExecutionRequestType.ConsolidationRequest));
+        }
+
+        return result;
 
-        static byte[] FlatEncodeRequests(TestExecutionRequest[] requests, int bufferSize)
+        static byte[] FlatEncodeRequests(ExecutionRequest.ExecutionRequest[] requests, int bufferSize, byte type)
         {
-            using ArrayPoolList<byte> buffer = new(bufferSize);
+            using ArrayPoolList<byte> buffer = new(bufferSize + 1) { type };
 
-            foreach (TestExecutionRequest request in requests)
+            foreach (ExecutionRequest.ExecutionRequest request in requests)
             {
                 buffer.AddRange(request.RequestData!);
             }

src/Nethermind/Nethermind.Core/ExecutionRequest/ExecutionRequestExtensions.cs

@@ -1,7 +1,6 @@
 // SPDX-FileCopyrightText: 2024 Demerzel Solutions Limited
 // SPDX-License-Identifier: LGPL-3.0-only
 
-
 using System;
 using System.Buffers;
 using System.Collections.Generic;
@@ -18,11 +17,11 @@ public static class ExecutionRequestExtensions
     public const int DepositRequestsBytesSize = PublicKeySize /*pubkey: Bytes48 */ + Hash256.Size /*withdrawal_credentials: Bytes32 */ + sizeof(ulong) /*amount: uint64*/ + 96 /*signature: Bytes96*/ + sizeof(ulong) /*index: uint64*/;
     public const int WithdrawalRequestsBytesSize = Address.Size + PublicKeySize /*validator_pubkey: Bytes48*/ + sizeof(ulong) /*amount: uint64*/;
     public const int ConsolidationRequestsBytesSize = Address.Size + PublicKeySize /*source_pubkey: Bytes48*/ + PublicKeySize /*target_pubkey: Bytes48*/;
-    public const int RequestPartsCount = 3;
+    public const int MaxRequestsCount = 3;
     private const int PublicKeySize = 48;
 
-    public static readonly byte[][] EmptyRequests = [[], [], []];
-    public static readonly Hash256 EmptyRequestsHash = CalculateHashFromFlatEncodedRequests(EmptyRequests);
+    public static byte[][] EmptyRequests = [];
+    public static Hash256 EmptyRequestsHash = CalculateHashFromFlatEncodedRequests(EmptyRequests);
 
     public static int GetRequestsByteSize(this IEnumerable<ExecutionRequest> requests)
     {
@@ -37,29 +36,22 @@ public static int GetRequestsByteSize(this IEnumerable<ExecutionRequest> request
     [SkipLocalsInit]
     public static Hash256 CalculateHashFromFlatEncodedRequests(byte[][]? flatEncodedRequests)
     {
-        // make sure that length is exactly 3
-        if (flatEncodedRequests is null || flatEncodedRequests.Length != RequestPartsCount)
+        // make sure that length is 3 or less elements
+        if (flatEncodedRequests is null || flatEncodedRequests.Length > MaxRequestsCount)
         {
-            throw new ArgumentException("Flat encoded requests must be an array of 3 elements");
+            throw new ArgumentException("Flat encoded requests must be an array of 3 or less elements");
         }
 
-        byte[] concatenatedHashes = new byte[Hash256.Size * RequestPartsCount];
-        int currentPosition = 0;
-        byte type = 0;
-        // Allocate the buffer once outside the loop
-        Span<byte> requestBuffer = stackalloc byte[Math.Max(Math.Max(flatEncodedRequests[0].Length, flatEncodedRequests[1].Length), flatEncodedRequests[2].Length) + 1];
-        // Compute sha256 for each request and concatenate them
+        using SHA256 sha256 = SHA256.Create();
+        using ArrayPoolList<byte> concatenatedHashes = new(Hash256.Size * MaxRequestsCount);
         foreach (byte[] requests in flatEncodedRequests)
         {
-            requestBuffer[0] = type;
-            requests.CopyTo(requestBuffer.Slice(1, requests.Length));
-            SHA256.HashData(requestBuffer[..(requests.Length + 1)]).CopyTo(concatenatedHashes.AsSpan(currentPosition, Hash256.Size));
-            currentPosition += Hash256.Size;
-            type++;
+            if (requests.Length <= 1) continue;
+            concatenatedHashes.AddRange(sha256.ComputeHash(requests));
         }
 
         // Compute sha256 of the concatenated hashes
-        return new Hash256(SHA256.HashData(concatenatedHashes));
+        return new Hash256(sha256.ComputeHash(concatenatedHashes.ToArray()));
     }
 
 
@@ -70,16 +62,28 @@ public static ArrayPoolList<byte[]> GetFlatEncodedRequests(
         ExecutionRequest[] consolidationRequests
     )
     {
-        return new(RequestPartsCount)
+        var result = new ArrayPoolList<byte[]>(MaxRequestsCount);
+
+        if (depositRequests.Length > 0)
+        {
+            result.Add(FlatEncodeRequests(depositRequests, depositRequests.Length * DepositRequestsBytesSize, (byte)ExecutionRequestType.Deposit));
+        }
+
+        if (withdrawalRequests.Length > 0)
         {
-            FlatEncodeRequests(depositRequests, depositRequests.Length * DepositRequestsBytesSize),
-            FlatEncodeRequests(withdrawalRequests, withdrawalRequests.Length * WithdrawalRequestsBytesSize),
-            FlatEncodeRequests(consolidationRequests, consolidationRequests.Length * ConsolidationRequestsBytesSize)
-        };
+            result.Add(FlatEncodeRequests(withdrawalRequests, withdrawalRequests.Length * WithdrawalRequestsBytesSize, (byte)ExecutionRequestType.WithdrawalRequest));
+        }
+
+        if (consolidationRequests.Length > 0)
+        {
+            result.Add(FlatEncodeRequests(consolidationRequests, consolidationRequests.Length * ConsolidationRequestsBytesSize, (byte)ExecutionRequestType.ConsolidationRequest));
+        }
+
+        return result;
 
-        static byte[] FlatEncodeRequests(ExecutionRequest[] requests, int bufferSize)
+        static byte[] FlatEncodeRequests(ExecutionRequest[] requests, int bufferSize, byte type)
         {
-            using ArrayPoolList<byte> buffer = new(bufferSize);
+            using ArrayPoolList<byte> buffer = new(bufferSize + 1) { type };
 
             foreach (ExecutionRequest request in requests)
             {

src/Nethermind/Nethermind.Merge.AuRa.Test/AuRaMergeEngineModuleTests.cs

@@ -62,10 +62,10 @@ int ErrorCode
         => base.forkchoiceUpdatedV2_should_validate_withdrawals(input);
 
     [TestCase(
-        "0xd25128557a58fe7bb6346d779cfc86a1f5bd9bff4786a118097aebdf3128f46d",
-        "0xcbf0d15de352e744aba609aca74846ede5fc3ffd00ca506914b498b00470cbf8",
+        "0x1270af16dfea9b40aa9381529cb2629008fea35386041f52c07034ea8c038a05",
+        "0xea3bdca86662fa8b5399f2c3ff494ced747f07834740ead723ebe023852e9ea1",
         "0xd75d320c3a98a02ec7fe2abdcb1769bd063fec04d73f1735810f365ac12bc4ba",
-        "0xc9763e9904d3fe5b")]
+        "0x7389011914b1ca84")]
     public override Task Should_process_block_as_expected_V4(string latestValidHash, string blockHash, string stateRoot, string payloadId)
         => base.Should_process_block_as_expected_V4(latestValidHash, blockHash, stateRoot, payloadId);
 

src/Nethermind/Nethermind.Merge.Plugin.Test/EngineModuleTests.V4.cs

@@ -24,10 +24,10 @@ namespace Nethermind.Merge.Plugin.Test;
 public partial class EngineModuleTests
 {
     [TestCase(
-        "0xd7e58364f16b4a329b959b166f9c32323cb135669335db5dadd0344568f8dc9a",
-        "0xfafb92e8ece12d5fcfa867df9ae6865c5bd8aaf0b277c244552bfe869f61fb26",
+        "0x9233c931ff3c17ae124b9aa2ca8db1c641a2dd87fa2d7e00030b274bcc33f928",
+        "0xe97fdbfa2fcf60073d9579d87b127cdbeffbe6c7387b9e1e836eb7f8fb2d9548",
         "0xa272b2f949e4a0e411c9b45542bd5d0ef3c311b5f26c4ed6b7a8d4f605a91154",
-        "0x774c6aff527bbc68")]
+        "0x2fc07c25edadc149")]
     public virtual async Task Should_process_block_as_expected_V4(string latestValidHash, string blockHash,
         string stateRoot, string payloadId)
     {
@@ -108,7 +108,7 @@ public virtual async Task Should_process_block_as_expected_V4(string latestValid
             Array.Empty<Transaction>(),
             Array.Empty<BlockHeader>(),
             withdrawals);
-        GetPayloadV4Result expectedPayload = new(block, UInt256.Zero, new BlobsBundleV1(block), executionRequests: new byte[][] { [], [], [] });
+        GetPayloadV4Result expectedPayload = new(block, UInt256.Zero, new BlobsBundleV1(block), executionRequests: []);
 
         response = await RpcTest.TestSerializedRequest(rpc, "engine_getPayloadV4", expectedPayloadId);
         successResponse = chain.JsonSerializer.Deserialize<JsonRpcSuccessResponse>(response);
@@ -121,7 +121,7 @@ public virtual async Task Should_process_block_as_expected_V4(string latestValid
         }));
 
         response = await RpcTest.TestSerializedRequest(rpc, "engine_newPayloadV4",
-            chain.JsonSerializer.Serialize(ExecutionPayloadV3.Create(block)), "[]", Keccak.Zero.ToString(true), "[\"0x\",\"0x\",\"0x\"]");
+            chain.JsonSerializer.Serialize(ExecutionPayloadV3.Create(block)), "[]", Keccak.Zero.ToString(true), "[]");
         successResponse = chain.JsonSerializer.Deserialize<JsonRpcSuccessResponse>(response);
 
         successResponse.Should().NotBeNull();

src/Nethermind/Nethermind.Merge.Plugin/Data/IExecutionPayloadParams.cs

@@ -48,9 +48,9 @@ public ValidationResult ValidateParams(IReleaseSpec spec, int version, out strin
                 return ValidationResult.Fail;
             }
 
-            if (ExecutionRequests.Length != ExecutionRequestExtensions.RequestPartsCount)
+            if (ExecutionRequests.Length > ExecutionRequestExtensions.MaxRequestsCount)
             {
-                error = "Execution requests must have exactly three items";
+                error = $"Execution requests must have less than {ExecutionRequestExtensions.MaxRequestsCount} items";
                 return ValidationResult.Invalid;
             }