eip 7840 implementation

src/Nethermind/Nethermind.Core/Specs/IReleaseSpec.cs

@@ -338,6 +338,13 @@ public interface IReleaseSpec : IEip1559Spec, IReceiptSpec
         /// <remarks>Backward compatibility for early Kovan blocks.</remarks>
         bool ValidateChainId => true;
 
+        /// <summary>
+        /// EIP-7780: Add blob schedule to EL config files
+        /// </summary>
+        bool IsEip7840Enabled { get; }
+        public ulong TargetBlobCount { get; set; }
+        public ulong MaxBlobCount { get; set; }
+
         public ulong WithdrawalTimestamp { get; }
 
         public ulong Eip4844TransitionTimestamp { get; }

src/Nethermind/Nethermind.Core/Specs/ReleaseSpecDecorator.cs

@@ -67,6 +67,9 @@ public class ReleaseSpecDecorator(IReleaseSpec spec) : IReleaseSpec
     public virtual bool IsEip4895Enabled => spec.IsEip4895Enabled;
     public virtual bool IsEip4844Enabled => spec.IsEip4844Enabled;
     public virtual bool IsEip4788Enabled => spec.IsEip4788Enabled;
+    public bool IsEip7840Enabled => spec.IsEip7840Enabled;
+    public ulong TargetBlobCount { get; set; }
+    public ulong MaxBlobCount { get; set; }
     public virtual Address? Eip4788ContractAddress => spec.Eip4788ContractAddress;
     public bool IsEip6110Enabled => spec.IsEip6110Enabled;
     public Address DepositContractAddress => spec.DepositContractAddress;

src/Nethermind/Nethermind.JsonRpc/Modules/Eth/FeeHistory/FeeHistoryOracle.cs

@@ -109,13 +109,19 @@ private readonly record struct BlockFeeHistorySearchInfo(
             BlockFeeHistorySearchInfo BlockFeeHistorySearchInfoFromBlock(Block b)
             {
                 BlobGasCalculator.TryCalculateFeePerBlobGas(b.Header, out UInt256 feePerBlobGas);
+
+                IReleaseSpec spec = _specProvider.GetSpec(b.Header);
+                var maxBlobGasPerBlob = spec.IsEip7840Enabled
+                    ? spec.MaxBlobCount
+                    : Eip4844Constants.MaxBlobGasPerBlock;
+
                 return new(
                     b.Number,
                     b.BaseFeePerGas,
                     BaseFeeCalculator.Calculate(b.Header, _specProvider.GetSpecFor1559(b.Number + 1)),
                     feePerBlobGas == UInt256.MaxValue ? UInt256.Zero : feePerBlobGas,
                     b.GasUsed / (double)b.GasLimit,
-                    (b.BlobGasUsed ?? 0) / (double)Eip4844Constants.MaxBlobGasPerBlock,
+                    (b.BlobGasUsed ?? 0) / (double)maxBlobGasPerBlob,
                     b.ParentHash,
                     b.GasUsed,
                     b.Transactions.Length,

src/Nethermind/Nethermind.Specs.Test/OverridableReleaseSpec.cs

@@ -154,6 +154,9 @@ public ulong Eip4844TransitionTimestamp
             }
         }
 
+        public bool IsEip7840Enabled => _spec.IsEip7840Enabled;
+        public ulong TargetBlobCount { get; set; }
+        public ulong MaxBlobCount { get; set; }
         public bool IsEip1153Enabled => _spec.IsEip1153Enabled;
         public bool IsEip3651Enabled => _spec.IsEip3651Enabled;
         public bool IsEip3855Enabled => _spec.IsEip3855Enabled;

src/Nethermind/Nethermind.Specs/ChainSpecStyle/ChainParameters.cs

@@ -131,6 +131,7 @@ public class ChainParameters
     public ulong? Eip7702TransitionTimestamp { get; set; }
     public ulong? OpGraniteTransitionTimestamp { get; set; }
     public ulong? OpHoloceneTransitionTimestamp { get; set; }
+    public ulong? Eip7840TransitionTimestamp { get; set; }
 
     #region EIP-4844 parameters
     /// <summary>

src/Nethermind/Nethermind.Specs/ChainSpecStyle/ChainSpec.cs

@@ -6,6 +6,7 @@
 using Nethermind.Config;
 using Nethermind.Core;
 using Nethermind.Int256;
+using Nethermind.Specs.ChainSpecStyle.Json;
 
 namespace Nethermind.Specs.ChainSpecStyle
 {
@@ -77,5 +78,9 @@ public class ChainSpec
         public ulong? ShanghaiTimestamp { get; set; }
 
         public ulong? CancunTimestamp { get; set; }
+
+        public ulong? PragueTimestamp { get; set; }
+
+        public Dictionary<string, ChainSpecBlobCountJson> BlobSchedule { get; set; } = [];
     }
 }

src/Nethermind/Nethermind.Specs/ChainSpecStyle/ChainSpecBasedSpecProvider.cs

@@ -10,6 +10,8 @@
 using Nethermind.Core.Specs;
 using Nethermind.Int256;
 using Nethermind.Logging;
+using Nethermind.Specs.ChainSpecStyle.Json;
+using Nethermind.Specs.Forks;
 
 namespace Nethermind.Specs.ChainSpecStyle
 {
@@ -199,6 +201,8 @@ private ReleaseSpec CreateReleaseSpec(ChainSpec chainSpec, long releaseStartBloc
             bool eip4844FeeCollector = releaseSpec.IsEip4844Enabled && (chainSpec.Parameters.Eip4844FeeCollectorTransitionTimestamp ?? long.MaxValue) <= releaseStartTimestamp;
             releaseSpec.FeeCollector = (eip1559FeeCollector || eip4844FeeCollector) ? chainSpec.Parameters.FeeCollector : null;
 
+            releaseSpec.IsEip7840Enabled = (chainSpec.Parameters.Eip7840TransitionTimestamp ?? ulong.MaxValue) <= releaseStartTimestamp;
+            SetMaxAndTargetBlobCount(chainSpec, releaseSpec, releaseStartTimestamp);
             releaseSpec.Eip1559BaseFeeMinValue = releaseSpec.IsEip1559Enabled && (chainSpec.Parameters.Eip1559BaseFeeMinValueTransition ?? long.MaxValue) <= releaseStartBlock ? chainSpec.Parameters.Eip1559BaseFeeMinValue : null;
             releaseSpec.ElasticityMultiplier = chainSpec.Parameters.Eip1559ElasticityMultiplier ?? Eip1559Constants.DefaultElasticityMultiplier;
             releaseSpec.ForkBaseFee = chainSpec.Parameters.Eip1559BaseFeeInitialValue ?? Eip1559Constants.DefaultForkBaseFee;
@@ -245,6 +249,39 @@ private ReleaseSpec CreateReleaseSpec(ChainSpec chainSpec, long releaseStartBloc
             return releaseSpec;
         }
 
+        private void SetMaxAndTargetBlobCount(ChainSpec chainSpec, ReleaseSpec spec, ulong? releaseStartTimestamp = null)
+        {
+            if (!spec.IsEip7840Enabled) return;
+
+            (IReleaseSpec? fork, IReleaseSpec? previousFork) = GetCurrentAndPreviousFork(chainSpec, releaseStartTimestamp);
+            if (fork is null) return;
+
+            if (chainSpec.BlobSchedule.TryGetValue(fork.Name.ToLower(), out ChainSpecBlobCountJson blobCount) ||
+                chainSpec.BlobSchedule.TryGetValue(previousFork.Name.ToLower(), out blobCount))
+            {
+                spec.TargetBlobCount = blobCount.TargetBlobCount;
+                spec.MaxBlobCount = blobCount.MaxBlobCount;
+            }
+            else
+            {
+                spec.TargetBlobCount = 0;
+                spec.MaxBlobCount = 0;
+            }
+        }
+
+        private (IReleaseSpec?, IReleaseSpec?) GetCurrentAndPreviousFork(ChainSpec chainSpec, ulong? releaseStartTimestamp = null)
+        {
+            // TODO: add Osaka
+            if ((chainSpec.PragueTimestamp ?? ulong.MaxValue) <= releaseStartTimestamp)
+            {
+                return (Prague.Instance, Cancun.Instance);
+            }
+
+            return (chainSpec.CancunTimestamp ?? ulong.MaxValue) <= releaseStartTimestamp
+                ? (Cancun.Instance, Shanghai.Instance)
+                : (null, null);
+        }
+
         public void UpdateMergeTransitionInfo(long? blockNumber, UInt256? terminalTotalDifficulty = null)
         {
             if (blockNumber is not null)

src/Nethermind/Nethermind.Specs/ChainSpecStyle/ChainSpecLoader.cs

@@ -42,6 +42,7 @@ private ChainSpec InitChainSpecFrom(ChainSpecJson chainSpecJson)
         chainSpec.ChainId = chainSpecJson.Params.ChainId ?? chainSpec.NetworkId;
         chainSpec.Name = chainSpecJson.Name;
         chainSpec.DataDir = chainSpecJson.DataDir;
+        chainSpec.BlobSchedule = chainSpecJson.BlobScheduleJson;
         LoadGenesis(chainSpecJson, chainSpec);
         LoadEngine(chainSpecJson, chainSpec);
         LoadAllocations(chainSpecJson, chainSpec);
@@ -175,6 +176,7 @@ bool GetForInnerPathExistence(KeyValuePair<string, JsonElement> o) =>
             MergeForkIdTransition = chainSpecJson.Params.MergeForkIdTransition,
             TerminalTotalDifficulty = chainSpecJson.Params.TerminalTotalDifficulty,
             TerminalPoWBlockNumber = chainSpecJson.Params.TerminalPoWBlockNumber,
+            Eip7840TransitionTimestamp = chainSpecJson.Params.Eip7840TransitionTimestamp,
 
             OntakeTransition = chainSpecJson.Params.OntakeTransition,
         };
@@ -224,6 +226,7 @@ chainSpec.Parameters.Eip1283DisableTransition is null
         chainSpec.LondonBlockNumber = chainSpec.Parameters.Eip1559Transition;
         chainSpec.ShanghaiTimestamp = chainSpec.Parameters.Eip3651TransitionTimestamp;
         chainSpec.CancunTimestamp = chainSpec.Parameters.Eip4844TransitionTimestamp;
+        chainSpec.PragueTimestamp = chainSpec.Parameters.Eip7840TransitionTimestamp;
 
         // TheMerge parameters
         chainSpec.MergeForkIdBlockNumber = chainSpec.Parameters.MergeForkIdTransition;

src/Nethermind/Nethermind.Specs/ChainSpecStyle/Json/ChainSpecBlobCountJson.cs

@@ -0,0 +1,10 @@
+// SPDX-FileCopyrightText: 2024 Demerzel Solutions Limited
+// SPDX-License-Identifier: LGPL-3.0-only
+
+namespace Nethermind.Specs.ChainSpecStyle.Json;
+
+public class ChainSpecBlobCountJson
+{
+    public ulong TargetBlobCount { get; set; }
+    public ulong MaxBlobCount { get; set; }
+}

src/Nethermind/Nethermind.Specs/ChainSpecStyle/Json/ChainSpecJson.cs

@@ -22,6 +22,7 @@ internal class ChainSpecJson
         public string[] Nodes { get; set; }
         [JsonPropertyName("accounts")]
         public Dictionary<string, AllocationJson> Accounts { get; set; }
+        public Dictionary<string, ChainSpecBlobCountJson> BlobScheduleJson { get; set; } = [];
 
         internal class EngineJson
         {

src/Nethermind/Nethermind.Specs/ChainSpecStyle/Json/ChainSpecParamsJson.cs

@@ -161,4 +161,5 @@ internal class ChainSpecParamsJson
     public ulong? Eip7702TransitionTimestamp { get; set; }
     public ulong? OpGraniteTransitionTimestamp { get; set; }
     public ulong? OpHoloceneTransitionTimestamp { get; set; }
+    public ulong? Eip7840TransitionTimestamp { get; set; }
 }

src/Nethermind/Nethermind.Specs/ReleaseSpec.cs

@@ -93,6 +93,9 @@ public bool IsEip1559Enabled
         public bool IsEip7002Enabled { get; set; }
         public bool IsEip7251Enabled { get; set; }
         public bool IsOntakeEnabled { get; set; }
+        public bool IsEip7840Enabled { get; set; }
+        public ulong TargetBlobCount { get; set; }
+        public ulong MaxBlobCount { get; set; }
 
         private Address _eip7251ContractAddress;
         public Address Eip7251ContractAddress