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cmd/evm: add difficulty calculation to t8n tool (#23353)

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This PR adds functionality to the evm t8n to calculate ethash difficulty. If the caller does not provide a currentDifficulty, but instead provides the parentTimestamp (well, semi-optional, will default to 0 if not given), and parentDifficulty, we can calculate it for him.

The caller can also provide a parentUncleHash. In most, but not all cases, the parent uncle hash also affects the formula. If no such hash is provided (or, if the empty all-zero hash is provided), it's assumed that there were no uncles.
This commit is contained in:
Martin Holst Swende
2021-08-25 15:04:26 +02:00
committed by GitHub
parent efee85378e
commit 84c51bc5ec
8 changed files with 172 additions and 40 deletions
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55
cmd/evm/internal/t8ntool/gen_stenv.go
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@ -16,38 +16,47 @@ var _ = (*stEnvMarshaling)(nil)
// MarshalJSON marshals as JSON.
func (s stEnv) MarshalJSON() ([]byte, error) {
type stEnv struct {
Coinbase common.UnprefixedAddress `json:"currentCoinbase" gencodec:"required"`
Difficulty *math.HexOrDecimal256 `json:"currentDifficulty" gencodec:"required"`
GasLimit math.HexOrDecimal64 `json:"currentGasLimit" gencodec:"required"`
Number math.HexOrDecimal64 `json:"currentNumber" gencodec:"required"`
Timestamp math.HexOrDecimal64 `json:"currentTimestamp" gencodec:"required"`
BlockHashes map[math.HexOrDecimal64]common.Hash `json:"blockHashes,omitempty"`
Ommers []ommer `json:"ommers,omitempty"`
BaseFee *math.HexOrDecimal256 `json:"currentBaseFee,omitempty"`
Coinbase common.UnprefixedAddress `json:"currentCoinbase" gencodec:"required"`
Difficulty *math.HexOrDecimal256 `json:"currentDifficulty"`
ParentDifficulty *math.HexOrDecimal256 `json:"parentDifficulty"`
GasLimit math.HexOrDecimal64 `json:"currentGasLimit" gencodec:"required"`
Number math.HexOrDecimal64 `json:"currentNumber" gencodec:"required"`
Timestamp math.HexOrDecimal64 `json:"currentTimestamp" gencodec:"required"`
ParentTimestamp math.HexOrDecimal64 `json:"parentTimestamp,omitempty"`
BlockHashes map[math.HexOrDecimal64]common.Hash `json:"blockHashes,omitempty"`
Ommers []ommer `json:"ommers,omitempty"`
BaseFee *math.HexOrDecimal256 `json:"currentBaseFee,omitempty"`
ParentUncleHash common.Hash `json:"parentUncleHash"`
}
var enc stEnv
enc.Coinbase = common.UnprefixedAddress(s.Coinbase)
enc.Difficulty = (*math.HexOrDecimal256)(s.Difficulty)
enc.ParentDifficulty = (*math.HexOrDecimal256)(s.ParentDifficulty)
enc.GasLimit = math.HexOrDecimal64(s.GasLimit)
enc.Number = math.HexOrDecimal64(s.Number)
enc.Timestamp = math.HexOrDecimal64(s.Timestamp)
enc.ParentTimestamp = math.HexOrDecimal64(s.ParentTimestamp)
enc.BlockHashes = s.BlockHashes
enc.Ommers = s.Ommers
enc.BaseFee = (*math.HexOrDecimal256)(s.BaseFee)
enc.ParentUncleHash = s.ParentUncleHash
return json.Marshal(&enc)
}
// UnmarshalJSON unmarshals from JSON.
func (s *stEnv) UnmarshalJSON(input []byte) error {
type stEnv struct {
Coinbase *common.UnprefixedAddress `json:"currentCoinbase" gencodec:"required"`
Difficulty *math.HexOrDecimal256 `json:"currentDifficulty" gencodec:"required"`
GasLimit *math.HexOrDecimal64 `json:"currentGasLimit" gencodec:"required"`
Number *math.HexOrDecimal64 `json:"currentNumber" gencodec:"required"`
Timestamp *math.HexOrDecimal64 `json:"currentTimestamp" gencodec:"required"`
BlockHashes map[math.HexOrDecimal64]common.Hash `json:"blockHashes,omitempty"`
Ommers []ommer `json:"ommers,omitempty"`
BaseFee *math.HexOrDecimal256 `json:"currentBaseFee,omitempty"`
Coinbase *common.UnprefixedAddress `json:"currentCoinbase" gencodec:"required"`
Difficulty *math.HexOrDecimal256 `json:"currentDifficulty"`
ParentDifficulty *math.HexOrDecimal256 `json:"parentDifficulty"`
GasLimit *math.HexOrDecimal64 `json:"currentGasLimit" gencodec:"required"`
Number *math.HexOrDecimal64 `json:"currentNumber" gencodec:"required"`
Timestamp *math.HexOrDecimal64 `json:"currentTimestamp" gencodec:"required"`
ParentTimestamp *math.HexOrDecimal64 `json:"parentTimestamp,omitempty"`
BlockHashes map[math.HexOrDecimal64]common.Hash `json:"blockHashes,omitempty"`
Ommers []ommer `json:"ommers,omitempty"`
BaseFee *math.HexOrDecimal256 `json:"currentBaseFee,omitempty"`
ParentUncleHash *common.Hash `json:"parentUncleHash"`
}
var dec stEnv
if err := json.Unmarshal(input, &dec); err != nil {
@ -57,10 +66,12 @@ func (s *stEnv) UnmarshalJSON(input []byte) error {
return errors.New("missing required field 'currentCoinbase' for stEnv")
}
s.Coinbase = common.Address(*dec.Coinbase)
if dec.Difficulty == nil {
return errors.New("missing required field 'currentDifficulty' for stEnv")
if dec.Difficulty != nil {
s.Difficulty = (*big.Int)(dec.Difficulty)
}
if dec.ParentDifficulty != nil {
s.ParentDifficulty = (*big.Int)(dec.ParentDifficulty)
}
s.Difficulty = (*big.Int)(dec.Difficulty)
if dec.GasLimit == nil {
return errors.New("missing required field 'currentGasLimit' for stEnv")
}
@ -73,6 +84,9 @@ func (s *stEnv) UnmarshalJSON(input []byte) error {
return errors.New("missing required field 'currentTimestamp' for stEnv")
}
s.Timestamp = uint64(*dec.Timestamp)
if dec.ParentTimestamp != nil {
s.ParentTimestamp = uint64(*dec.ParentTimestamp)
}
if dec.BlockHashes != nil {
s.BlockHashes = dec.BlockHashes
}
@ -82,5 +96,8 @@ func (s *stEnv) UnmarshalJSON(input []byte) error {
if dec.BaseFee != nil {
s.BaseFee = (*big.Int)(dec.BaseFee)
}
if dec.ParentUncleHash != nil {
s.ParentUncleHash = *dec.ParentUncleHash
}
return nil
}