cmd/evm: calc base fee if parent data is present (#26051)

Currently, in order to chain together sequential valid t8n transitions the caller must manually calculate the block base fee. This PR adds support for the necessary parent fee market data to calculate the base fee for the current transition.

Concretely, env is extended to accept the following:

    parentBaseFee
    parentGasUsed
    parentGasLimit

Example usage can be found in ./cmd/evm/testdata/25.

Co-authored-by: Martin Holst Swende <[email protected]>

Author: lightclient

cmd/evm/internal/t8ntool/execution.go

@@ -56,6 +56,7 @@ type ExecutionResult struct {
 	Rejected    []*rejectedTx         `json:"rejected,omitempty"`
 	Difficulty  *math.HexOrDecimal256 `json:"currentDifficulty" gencodec:"required"`
 	GasUsed     math.HexOrDecimal64   `json:"gasUsed"`
+	BaseFee     *math.HexOrDecimal256 `json:"currentBaseFee,omitempty"`
 }
 
 type ommer struct {
@@ -69,6 +70,9 @@ type stEnv struct {
 	Difficulty       *big.Int                            `json:"currentDifficulty"`
 	Random           *big.Int                            `json:"currentRandom"`
 	ParentDifficulty *big.Int                            `json:"parentDifficulty"`
+	ParentBaseFee    *big.Int                            `json:"parentBaseFee,omitempty"`
+	ParentGasUsed    uint64                              `json:"parentGasUsed,omitempty"`
+	ParentGasLimit   uint64                              `json:"parentGasLimit,omitempty"`
 	GasLimit         uint64                              `json:"currentGasLimit"   gencodec:"required"`
 	Number           uint64                              `json:"currentNumber"     gencodec:"required"`
 	Timestamp        uint64                              `json:"currentTimestamp"  gencodec:"required"`
@@ -84,6 +88,9 @@ type stEnvMarshaling struct {
 	Difficulty       *math.HexOrDecimal256
 	Random           *math.HexOrDecimal256
 	ParentDifficulty *math.HexOrDecimal256
+	ParentBaseFee    *math.HexOrDecimal256
+	ParentGasUsed    math.HexOrDecimal64
+	ParentGasLimit   math.HexOrDecimal64
 	GasLimit         math.HexOrDecimal64
 	Number           math.HexOrDecimal64
 	Timestamp        math.HexOrDecimal64
@@ -263,6 +270,7 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 		Rejected:    rejectedTxs,
 		Difficulty:  (*math.HexOrDecimal256)(vmContext.Difficulty),
 		GasUsed:     (math.HexOrDecimal64)(gasUsed),
+		BaseFee:     (*math.HexOrDecimal256)(vmContext.BaseFee),
 	}
 	return statedb, execRs, nil
 }

cmd/evm/internal/t8ntool/gen_stenv.go

@@ -28,6 +28,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/consensus/misc"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
@@ -247,7 +248,17 @@ func Transition(ctx *cli.Context) error {
 	}
 	// Sanity check, to not `panic` in state_transition
 	if chainConfig.IsLondon(big.NewInt(int64(prestate.Env.Number))) {
-		if prestate.Env.BaseFee == nil {
+		if prestate.Env.BaseFee != nil {
+			// Already set, base fee has precedent over parent base fee.
+		} else if prestate.Env.ParentBaseFee != nil {
+			parent := &types.Header{
+				Number:   new(big.Int).SetUint64(prestate.Env.Number),
+				BaseFee:  prestate.Env.ParentBaseFee,
+				GasUsed:  prestate.Env.ParentGasUsed,
+				GasLimit: prestate.Env.ParentGasLimit,
+			}
+			prestate.Env.BaseFee = misc.CalcBaseFee(chainConfig, parent)
+		} else {
 			return NewError(ErrorConfig, errors.New("EIP-1559 config but missing 'currentBaseFee' in env section"))
 		}
 	}

cmd/evm/internal/t8ntool/transition.go

@@ -243,6 +243,14 @@ func TestT8n(t *testing.T) {
 			output:      t8nOutput{alloc: false, result: false},
 			expExitCode: 3,
 		},
+		{ // Test base fee calculation
+			base: "./testdata/25",
+			input: t8nInput{
+				"alloc.json", "txs.json", "env.json", "Merged", "",
+			},
+			output: t8nOutput{alloc: true, result: true},
+			expOut: "exp.json",
+		},
 	} {
 		args := []string{"t8n"}
 		args = append(args, tc.output.get()...)

cmd/evm/t8n_test.go

@@ -34,6 +34,7 @@
       }
     ],
     "currentDifficulty": "0x20000",
-    "gasUsed": "0x109a0"
+    "gasUsed": "0x109a0",
+    "currentBaseFee": "0x36b"
   }
 }

cmd/evm/testdata/13/exp2.json

@@ -7,6 +7,7 @@
     "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
     "currentDifficulty": "0x2000020000000",
     "receipts": [],
-    "gasUsed": "0x0"
+    "gasUsed": "0x0",
+    "currentBaseFee": "0x500"
   }
 }

cmd/evm/testdata/14/exp.json

@@ -7,6 +7,7 @@
     "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
     "receipts": [],
     "currentDifficulty": "0x1ff8020000000",
-    "gasUsed": "0x0"
+    "gasUsed": "0x0",
+    "currentBaseFee": "0x500"
   }
 }

cmd/evm/testdata/14/exp2.json

@@ -7,6 +7,7 @@
     "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
     "receipts": [],
     "currentDifficulty": "0x1ff9000000000",
-    "gasUsed": "0x0"
+    "gasUsed": "0x0",
+    "currentBaseFee": "0x500"
   }
 }

cmd/evm/testdata/14/exp_berlin.json

@@ -7,6 +7,7 @@
     "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
     "currentDifficulty": "0x2000000200000",
     "receipts": [],
-    "gasUsed": "0x0"
+    "gasUsed": "0x0",
+    "currentBaseFee": "0x500"
   }
 }

cmd/evm/testdata/19/exp_arrowglacier.json

@@ -7,6 +7,7 @@
       "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
       "receipts": [],
       "currentDifficulty": "0x2000000004000",
-      "gasUsed": "0x0"
+      "gasUsed": "0x0",
+      "currentBaseFee": "0x500"
     }
 }