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consensus: implement EIP-7918

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Co-authored-by: Sina Mahmoodi <itz.s1na@gmail.com>
This commit is contained in:
lightclient 2025-06-23 20:09:36 +02:00
parent 8ec1db1a4a
commit b58f8b3a5f
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GPG key ID: 657913021EF45A6A
3 changed files with 66 additions and 2 deletions
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27
consensus/misc/eip4844/eip4844.go
View file

@ -70,11 +70,28 @@ func CalcExcessBlobGas(config *params.ChainConfig, parent *types.Header, headTim
parentExcessBlobGas = *parent.ExcessBlobGas
parentBlobGasUsed = *parent.BlobGasUsed
}
excessBlobGas := parentExcessBlobGas + parentBlobGasUsed
targetGas := uint64(targetBlobsPerBlock(config, headTimestamp)) * params.BlobTxBlobGasPerBlob
var (
excessBlobGas = parentExcessBlobGas + parentBlobGasUsed
target = targetBlobsPerBlock(config, headTimestamp)
targetGas = uint64(target) * params.BlobTxBlobGasPerBlob
)
if excessBlobGas < targetGas {
return 0
}
if !config.IsOsaka(config.LondonBlock, headTimestamp) {
return excessBlobGas - targetGas
}
// EIP-7918 (post-Osaka).
var (
reservePrice = new(big.Int).Mul(parent.BaseFee, big.NewInt(params.BlobBaseCost))
blobPrice = calcBlobPrice(config, parent)
)
if reservePrice.Cmp(blobPrice) > 0 {
max := MaxBlobsPerBlock(config, headTimestamp)
scaledExcess := parentBlobGasUsed * uint64(max-target) / uint64(max)
return parentExcessBlobGas + scaledExcess
}
return excessBlobGas - targetGas
}
@ -185,3 +202,9 @@ func fakeExponential(factor, numerator, denominator *big.Int) *big.Int {
}
return output.Div(output, denominator)
}
// calcBlobPrice calculates the blob price for a block.
func calcBlobPrice(config *params.ChainConfig, header *types.Header) *big.Int {
blobBaseFee := CalcBlobFee(config, header)
return new(big.Int).Mul(blobBaseFee, big.NewInt(params.BlobTxBlobGasPerBlob))
}

40
consensus/misc/eip4844/eip4844_test.go
View file

@ -127,3 +127,43 @@ func TestFakeExponential(t *testing.T) {
}
}
}
func TestCalcExcessBlobGasEIP7918(t *testing.T) {
var (
cfg = params.MergedTestChainConfig
targetBlobs = targetBlobsPerBlock(cfg, *cfg.CancunTime)
blobGasTarget = uint64(targetBlobs) * params.BlobTxBlobGasPerBlob
)
makeHeader := func(parentExcess, parentBaseFee uint64, blobsUsed int) *types.Header {
blobGasUsed := uint64(blobsUsed) * params.BlobTxBlobGasPerBlob
return &types.Header{
BaseFee: big.NewInt(int64(parentBaseFee)),
ExcessBlobGas: &parentExcess,
BlobGasUsed: &blobGasUsed,
}
}
tests := []struct {
name string
header *types.Header
wantExcessGas uint64
}{
{
name: "BelowReservePrice",
header: makeHeader(0, 1_000_000_000, targetBlobs),
wantExcessGas: blobGasTarget * 3 / 9,
},
{
name: "AboveReservePrice",
header: makeHeader(0, 1, targetBlobs),
wantExcessGas: 0,
},
}
for _, tc := range tests {
got := CalcExcessBlobGas(cfg, tc.header, *cfg.CancunTime)
if got != tc.wantExcessGas {
t.Fatalf("%s: excess-blob-gas mismatch – have %d, want %d",
tc.name, got, tc.wantExcessGas)
}
}
}

1
params/protocol_params.go
View file

@ -178,6 +178,7 @@ const (
BlobTxBlobGasPerBlob = 1 << 17 // Gas consumption of a single data blob (== blob byte size)
BlobTxMinBlobGasprice = 1 // Minimum gas price for data blobs
BlobTxPointEvaluationPrecompileGas = 50000 // Gas price for the point evaluation precompile.
BlobBaseCost = 1 << 14 // Base execution gas cost for a blob.
HistoryServeWindow = 8192 // Number of blocks to serve historical block hashes for, EIP-2935.
)