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eth/catalyst: implement kintsugi-spec v3 (#24067)

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pull/24128/head
Marius van der Wijden 3 years ago committed by GitHub
parent f5f5c0855a
commit 2295640ebd
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GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 97 additions and 59 deletions
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  1. 37
      core/forkid/forkid_test.go
  2. 39
      eth/catalyst/api.go
  3. 6
      eth/catalyst/api_test.go
  4. 10
      eth/catalyst/api_types.go
  5. 20
      eth/catalyst/gen_blockparams.go
  6. 24
      eth/catalyst/gen_ed.go
  7. 14
      params/config.go
  8. 6
      rpc/errors.go

37
core/forkid/forkid_test.go
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@ -19,6 +19,7 @@ package forkid
import (
"bytes"
"math"
"math/big"
"testing"
"github.com/ethereum/go-ethereum/common"
@ -29,6 +30,8 @@ import (
// TestCreation tests that different genesis and fork rule combinations result in
// the correct fork ID.
func TestCreation(t *testing.T) {
mergeConfig := *params.MainnetChainConfig
mergeConfig.MergeForkBlock = big.NewInt(15000000)
type testcase struct {
head uint64
want ID
@ -65,7 +68,7 @@ func TestCreation(t *testing.T) {
{12964999, ID{Hash: checksumToBytes(0x0eb440f6), Next: 12965000}}, // Last Berlin block
{12965000, ID{Hash: checksumToBytes(0xb715077d), Next: 13773000}}, // First London block
{13772999, ID{Hash: checksumToBytes(0xb715077d), Next: 13773000}}, // Last London block
{13773000, ID{Hash: checksumToBytes(0x20c327fc), Next: 0}}, /// First Arrow Glacier block
{13773000, ID{Hash: checksumToBytes(0x20c327fc), Next: 0}}, // First Arrow Glacier block
{20000000, ID{Hash: checksumToBytes(0x20c327fc), Next: 0}}, // Future Arrow Glacier block
},
},
@ -133,6 +136,38 @@ func TestCreation(t *testing.T) {
{6000000, ID{Hash: checksumToBytes(0xB8C6299D), Next: 0}}, // Future London block
},
},
// Merge test cases
{
&mergeConfig,
params.MainnetGenesisHash,
[]testcase{
{0, ID{Hash: checksumToBytes(0xfc64ec04), Next: 1150000}}, // Unsynced
{1149999, ID{Hash: checksumToBytes(0xfc64ec04), Next: 1150000}}, // Last Frontier block
{1150000, ID{Hash: checksumToBytes(0x97c2c34c), Next: 1920000}}, // First Homestead block
{1919999, ID{Hash: checksumToBytes(0x97c2c34c), Next: 1920000}}, // Last Homestead block
{1920000, ID{Hash: checksumToBytes(0x91d1f948), Next: 2463000}}, // First DAO block
{2462999, ID{Hash: checksumToBytes(0x91d1f948), Next: 2463000}}, // Last DAO block
{2463000, ID{Hash: checksumToBytes(0x7a64da13), Next: 2675000}}, // First Tangerine block
{2674999, ID{Hash: checksumToBytes(0x7a64da13), Next: 2675000}}, // Last Tangerine block
{2675000, ID{Hash: checksumToBytes(0x3edd5b10), Next: 4370000}}, // First Spurious block
{4369999, ID{Hash: checksumToBytes(0x3edd5b10), Next: 4370000}}, // Last Spurious block
{4370000, ID{Hash: checksumToBytes(0xa00bc324), Next: 7280000}}, // First Byzantium block
{7279999, ID{Hash: checksumToBytes(0xa00bc324), Next: 7280000}}, // Last Byzantium block
{7280000, ID{Hash: checksumToBytes(0x668db0af), Next: 9069000}}, // First and last Constantinople, first Petersburg block
{9068999, ID{Hash: checksumToBytes(0x668db0af), Next: 9069000}}, // Last Petersburg block
{9069000, ID{Hash: checksumToBytes(0x879d6e30), Next: 9200000}}, // First Istanbul and first Muir Glacier block
{9199999, ID{Hash: checksumToBytes(0x879d6e30), Next: 9200000}}, // Last Istanbul and first Muir Glacier block
{9200000, ID{Hash: checksumToBytes(0xe029e991), Next: 12244000}}, // First Muir Glacier block
{12243999, ID{Hash: checksumToBytes(0xe029e991), Next: 12244000}}, // Last Muir Glacier block
{12244000, ID{Hash: checksumToBytes(0x0eb440f6), Next: 12965000}}, // First Berlin block
{12964999, ID{Hash: checksumToBytes(0x0eb440f6), Next: 12965000}}, // Last Berlin block
{12965000, ID{Hash: checksumToBytes(0xb715077d), Next: 13773000}}, // First London block
{13772999, ID{Hash: checksumToBytes(0xb715077d), Next: 13773000}}, // Last London block
{13773000, ID{Hash: checksumToBytes(0x20c327fc), Next: 15000000}}, // First Arrow Glacier block
{15000000, ID{Hash: checksumToBytes(0xe3abe201), Next: 0}}, // First Merge Start block
{20000000, ID{Hash: checksumToBytes(0xe3abe201), Next: 0}}, // Future Merge Start block
},
},
}
for i, tt := range tests {
for j, ttt := range tt.cases {

39
eth/catalyst/api.go
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@ -43,13 +43,14 @@ import (
)
var (
VALID = GenericStringResponse{"VALID"}
SUCCESS = GenericStringResponse{"SUCCESS"}
INVALID = ForkChoiceResponse{Status: "INVALID", PayloadID: nil}
SYNCING = ForkChoiceResponse{Status: "INVALID", PayloadID: nil}
UnknownHeader = rpc.CustomError{Code: -32000, Message: "unknown header"}
UnknownPayload = rpc.CustomError{Code: -32001, Message: "unknown payload"}
InvalidPayloadID = rpc.CustomError{Code: 1, Message: "invalid payload id"}
VALID = GenericStringResponse{"VALID"}
SUCCESS = GenericStringResponse{"SUCCESS"}
INVALID = ForkChoiceResponse{Status: "INVALID", PayloadID: nil}
SYNCING = ForkChoiceResponse{Status: "SYNCING", PayloadID: nil}
GenericServerError = rpc.CustomError{Code: -32000, ValidationError: "Server error"}
UnknownPayload = rpc.CustomError{Code: -32001, ValidationError: "Unknown payload"}
InvalidTB = rpc.CustomError{Code: -32002, ValidationError: "Invalid terminal block"}
InvalidPayloadID = rpc.CustomError{Code: 1, ValidationError: "invalid payload id"}
)
// Register adds catalyst APIs to the full node.
@ -232,7 +233,7 @@ func computePayloadId(headBlockHash common.Hash, params *PayloadAttributesV1) []
hasher.Write(headBlockHash[:])
binary.Write(hasher, binary.BigEndian, params.Timestamp)
hasher.Write(params.Random[:])
hasher.Write(params.FeeRecipient[:])
hasher.Write(params.SuggestedFeeRecipient[:])
return hasher.Sum([]byte{})[:8]
}
@ -308,7 +309,7 @@ func (api *ConsensusAPI) assembleBlock(parentHash common.Hash, params *PayloadAt
log.Warn("Producing block too far in the future", "diff", common.PrettyDuration(diff))
}
pending := api.eth.TxPool().Pending(true)
coinbase := params.FeeRecipient
coinbase := params.SuggestedFeeRecipient
num := parent.Number()
header := &types.Header{
ParentHash: parent.Hash(),
@ -419,10 +420,10 @@ func ExecutableDataToBlock(params ExecutableDataV1) (*types.Block, error) {
header := &types.Header{
ParentHash: params.ParentHash,
UncleHash: types.EmptyUncleHash,
Coinbase: params.Coinbase,
Coinbase: params.FeeRecipient,
Root: params.StateRoot,
TxHash: types.DeriveSha(types.Transactions(txs), trie.NewStackTrie(nil)),
ReceiptHash: params.ReceiptRoot,
ReceiptHash: params.ReceiptsRoot,
Bloom: types.BytesToBloom(params.LogsBloom),
Difficulty: common.Big0,
Number: number,
@ -444,14 +445,14 @@ func BlockToExecutableData(block *types.Block, random common.Hash) *ExecutableDa
return &ExecutableDataV1{
BlockHash: block.Hash(),
ParentHash: block.ParentHash(),
Coinbase: block.Coinbase(),
FeeRecipient: block.Coinbase(),
StateRoot: block.Root(),
Number: block.NumberU64(),
GasLimit: block.GasLimit(),
GasUsed: block.GasUsed(),
BaseFeePerGas: block.BaseFee(),
Timestamp: block.Time(),
ReceiptRoot: block.ReceiptHash(),
ReceiptsRoot: block.ReceiptHash(),
LogsBloom: block.Bloom().Bytes(),
Transactions: encodeTransactions(block.Transactions()),
Random: random,
@ -475,11 +476,11 @@ func (api *ConsensusAPI) checkTerminalTotalDifficulty(head common.Hash) error {
// make sure the parent has enough terminal total difficulty
newHeadBlock := api.eth.BlockChain().GetBlockByHash(head)
if newHeadBlock == nil {
return &UnknownHeader
return &GenericServerError
}
td := api.eth.BlockChain().GetTd(newHeadBlock.Hash(), newHeadBlock.NumberU64())
if td != nil && td.Cmp(api.eth.BlockChain().Config().TerminalTotalDifficulty) < 0 {
return errors.New("total difficulty not reached yet")
return &InvalidTB
}
return nil
}
@ -494,7 +495,7 @@ func (api *ConsensusAPI) setHead(newHead common.Hash) error {
}
newHeadHeader := api.les.BlockChain().GetHeaderByHash(newHead)
if newHeadHeader == nil {
return &UnknownHeader
return &GenericServerError
}
if err := api.les.BlockChain().SetChainHead(newHeadHeader); err != nil {
return err
@ -508,15 +509,11 @@ func (api *ConsensusAPI) setHead(newHead common.Hash) error {
}
headBlock := api.eth.BlockChain().CurrentBlock()
if headBlock.Hash() == newHead {
// Trigger the transition if it's the first `NewHead` event.
if merger := api.merger(); !merger.PoSFinalized() {
merger.FinalizePoS()
}
return nil
}
newHeadBlock := api.eth.BlockChain().GetBlockByHash(newHead)
if newHeadBlock == nil {
return &UnknownHeader
return &GenericServerError
}
if err := api.eth.BlockChain().SetChainHead(newHeadBlock); err != nil {
return err

6
eth/catalyst/api_test.go
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@ -374,9 +374,9 @@ func TestFullAPI(t *testing.T) {
ethservice.TxPool().AddLocal(tx)
params := PayloadAttributesV1{
Timestamp: parent.Time() + 1,
Random: crypto.Keccak256Hash([]byte{byte(i)}),
FeeRecipient: parent.Coinbase(),
Timestamp: parent.Time() + 1,
Random: crypto.Keccak256Hash([]byte{byte(i)}),
SuggestedFeeRecipient: parent.Coinbase(),
}
fcState := ForkchoiceStateV1{
HeadBlockHash: parent.Hash(),

10
eth/catalyst/api_types.go
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@ -27,9 +27,9 @@ import (
// Structure described at https://github.com/ethereum/execution-apis/pull/74
type PayloadAttributesV1 struct {
Timestamp uint64 `json:"timestamp" gencodec:"required"`
Random common.Hash `json:"random" gencodec:"required"`
FeeRecipient common.Address `json:"feeRecipient" gencodec:"required"`
Timestamp uint64 `json:"timestamp" gencodec:"required"`
Random common.Hash `json:"random" gencodec:"required"`
SuggestedFeeRecipient common.Address `json:"suggestedFeeRecipient" gencodec:"required"`
}
// JSON type overrides for PayloadAttributesV1.
@ -42,9 +42,9 @@ type payloadAttributesMarshaling struct {
// Structure described at https://github.com/ethereum/execution-apis/src/engine/specification.md
type ExecutableDataV1 struct {
ParentHash common.Hash `json:"parentHash" gencodec:"required"`
Coinbase common.Address `json:"coinbase" gencodec:"required"`
FeeRecipient common.Address `json:"feeRecipient" gencodec:"required"`
StateRoot common.Hash `json:"stateRoot" gencodec:"required"`
ReceiptRoot common.Hash `json:"receiptRoot" gencodec:"required"`
ReceiptsRoot common.Hash `json:"receiptsRoot" gencodec:"required"`
LogsBloom []byte `json:"logsBloom" gencodec:"required"`
Random common.Hash `json:"random" gencodec:"required"`
Number uint64 `json:"blockNumber" gencodec:"required"`

20
eth/catalyst/gen_blockparams.go
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@ -15,23 +15,23 @@ var _ = (*payloadAttributesMarshaling)(nil)
// MarshalJSON marshals as JSON.
func (p PayloadAttributesV1) MarshalJSON() ([]byte, error) {
type PayloadAttributesV1 struct {
Timestamp hexutil.Uint64 `json:"timestamp" gencodec:"required"`
Random common.Hash `json:"random" gencodec:"required"`
FeeRecipient common.Address `json:"feeRecipient" gencodec:"required"`
Timestamp hexutil.Uint64 `json:"timestamp" gencodec:"required"`
Random common.Hash `json:"random" gencodec:"required"`
SuggestedFeeRecipient common.Address `json:"suggestedFeeRecipient" gencodec:"required"`
}
var enc PayloadAttributesV1
enc.Timestamp = hexutil.Uint64(p.Timestamp)
enc.Random = p.Random
enc.FeeRecipient = p.FeeRecipient
enc.SuggestedFeeRecipient = p.SuggestedFeeRecipient
return json.Marshal(&enc)
}
// UnmarshalJSON unmarshals from JSON.
func (p *PayloadAttributesV1) UnmarshalJSON(input []byte) error {
type PayloadAttributesV1 struct {
Timestamp *hexutil.Uint64 `json:"timestamp" gencodec:"required"`
Random *common.Hash `json:"random" gencodec:"required"`
FeeRecipient *common.Address `json:"feeRecipient" gencodec:"required"`
Timestamp *hexutil.Uint64 `json:"timestamp" gencodec:"required"`
Random *common.Hash `json:"random" gencodec:"required"`
SuggestedFeeRecipient *common.Address `json:"suggestedFeeRecipient" gencodec:"required"`
}
var dec PayloadAttributesV1
if err := json.Unmarshal(input, &dec); err != nil {
@ -45,9 +45,9 @@ func (p *PayloadAttributesV1) UnmarshalJSON(input []byte) error {
return errors.New("missing required field 'random' for PayloadAttributesV1")
}
p.Random = *dec.Random
if dec.FeeRecipient == nil {
return errors.New("missing required field 'feeRecipient' for PayloadAttributesV1")
if dec.SuggestedFeeRecipient == nil {
return errors.New("missing required field 'suggestedFeeRecipient' for PayloadAttributesV1")
}
p.FeeRecipient = *dec.FeeRecipient
p.SuggestedFeeRecipient = *dec.SuggestedFeeRecipient
return nil
}

24
eth/catalyst/gen_ed.go
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@ -17,9 +17,9 @@ var _ = (*executableDataMarshaling)(nil)
func (e ExecutableDataV1) MarshalJSON() ([]byte, error) {
type ExecutableDataV1 struct {
ParentHash common.Hash `json:"parentHash" gencodec:"required"`
Coinbase common.Address `json:"coinbase" gencodec:"required"`
FeeRecipient common.Address `json:"feeRecipient" gencodec:"required"`
StateRoot common.Hash `json:"stateRoot" gencodec:"required"`
ReceiptRoot common.Hash `json:"receiptRoot" gencodec:"required"`
ReceiptsRoot common.Hash `json:"receiptsRoot" gencodec:"required"`
LogsBloom hexutil.Bytes `json:"logsBloom" gencodec:"required"`
Random common.Hash `json:"random" gencodec:"required"`
Number hexutil.Uint64 `json:"blockNumber" gencodec:"required"`
@ -33,9 +33,9 @@ func (e ExecutableDataV1) MarshalJSON() ([]byte, error) {
}
var enc ExecutableDataV1
enc.ParentHash = e.ParentHash
enc.Coinbase = e.Coinbase
enc.FeeRecipient = e.FeeRecipient
enc.StateRoot = e.StateRoot
enc.ReceiptRoot = e.ReceiptRoot
enc.ReceiptsRoot = e.ReceiptsRoot
enc.LogsBloom = e.LogsBloom
enc.Random = e.Random
enc.Number = hexutil.Uint64(e.Number)
@ -58,9 +58,9 @@ func (e ExecutableDataV1) MarshalJSON() ([]byte, error) {
func (e *ExecutableDataV1) UnmarshalJSON(input []byte) error {
type ExecutableDataV1 struct {
ParentHash *common.Hash `json:"parentHash" gencodec:"required"`
Coinbase *common.Address `json:"coinbase" gencodec:"required"`
FeeRecipient *common.Address `json:"feeRecipient" gencodec:"required"`
StateRoot *common.Hash `json:"stateRoot" gencodec:"required"`
ReceiptRoot *common.Hash `json:"receiptRoot" gencodec:"required"`
ReceiptsRoot *common.Hash `json:"receiptsRoot" gencodec:"required"`
LogsBloom *hexutil.Bytes `json:"logsBloom" gencodec:"required"`
Random *common.Hash `json:"random" gencodec:"required"`
Number *hexutil.Uint64 `json:"blockNumber" gencodec:"required"`
@ -80,18 +80,18 @@ func (e *ExecutableDataV1) UnmarshalJSON(input []byte) error {
return errors.New("missing required field 'parentHash' for ExecutableDataV1")
}
e.ParentHash = *dec.ParentHash
if dec.Coinbase == nil {
return errors.New("missing required field 'coinbase' for ExecutableDataV1")
if dec.FeeRecipient == nil {
return errors.New("missing required field 'feeRecipient' for ExecutableDataV1")
}
e.Coinbase = *dec.Coinbase
e.FeeRecipient = *dec.FeeRecipient
if dec.StateRoot == nil {
return errors.New("missing required field 'stateRoot' for ExecutableDataV1")
}
e.StateRoot = *dec.StateRoot
if dec.ReceiptRoot == nil {
return errors.New("missing required field 'receiptRoot' for ExecutableDataV1")
if dec.ReceiptsRoot == nil {
return errors.New("missing required field 'receiptsRoot' for ExecutableDataV1")
}
e.ReceiptRoot = *dec.ReceiptRoot
e.ReceiptsRoot = *dec.ReceiptsRoot
if dec.LogsBloom == nil {
return errors.New("missing required field 'logsBloom' for ExecutableDataV1")
}

14
params/config.go
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@ -257,16 +257,16 @@ var (
//
// This configuration is intentionally not using keyed fields to force anyone
// adding flags to the config to also have to set these fields.
AllEthashProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, new(EthashConfig), nil}
AllEthashProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, new(EthashConfig), nil}
// AllCliqueProtocolChanges contains every protocol change (EIPs) introduced
// and accepted by the Ethereum core developers into the Clique consensus.
//
// This configuration is intentionally not using keyed fields to force anyone
// adding flags to the config to also have to set these fields.
AllCliqueProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, nil, &CliqueConfig{Period: 0, Epoch: 30000}}
AllCliqueProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, nil, nil, &CliqueConfig{Period: 0, Epoch: 30000}}
TestChainConfig = &ChainConfig{big.NewInt(1), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, new(EthashConfig), nil}
TestChainConfig = &ChainConfig{big.NewInt(1), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, new(EthashConfig), nil}
TestRules = TestChainConfig.Rules(new(big.Int))
)
@ -346,6 +346,7 @@ type ChainConfig struct {
BerlinBlock *big.Int `json:"berlinBlock,omitempty"` // Berlin switch block (nil = no fork, 0 = already on berlin)
LondonBlock *big.Int `json:"londonBlock,omitempty"` // London switch block (nil = no fork, 0 = already on london)
ArrowGlacierBlock *big.Int `json:"arrowGlacierBlock,omitempty"` // Eip-4345 (bomb delay) switch block (nil = no fork, 0 = already activated)
MergeForkBlock *big.Int `json:"mergeForkBlock,omitempty"` // EIP-3675 (TheMerge) switch block (nil = no fork, 0 = already in merge proceedings)
// TerminalTotalDifficulty is the amount of total difficulty reached by
// the network that triggers the consensus upgrade.
@ -386,7 +387,7 @@ func (c *ChainConfig) String() string {
default:
engine = "unknown"
}
return fmt.Sprintf("{ChainID: %v Homestead: %v DAO: %v DAOSupport: %v EIP150: %v EIP155: %v EIP158: %v Byzantium: %v Constantinople: %v Petersburg: %v Istanbul: %v, Muir Glacier: %v, Berlin: %v, London: %v, Arrow Glacier: %v, Engine: %v}",
return fmt.Sprintf("{ChainID: %v Homestead: %v DAO: %v DAOSupport: %v EIP150: %v EIP155: %v EIP158: %v Byzantium: %v Constantinople: %v Petersburg: %v Istanbul: %v, Muir Glacier: %v, Berlin: %v, London: %v, Arrow Glacier: %v, MergeFork: %v, Engine: %v}",
c.ChainID,
c.HomesteadBlock,
c.DAOForkBlock,
@ -402,6 +403,7 @@ func (c *ChainConfig) String() string {
c.BerlinBlock,
c.LondonBlock,
c.ArrowGlacierBlock,
c.MergeForkBlock,
engine,
)
}
@ -522,6 +524,7 @@ func (c *ChainConfig) CheckConfigForkOrder() error {
{name: "berlinBlock", block: c.BerlinBlock},
{name: "londonBlock", block: c.LondonBlock},
{name: "arrowGlacierBlock", block: c.ArrowGlacierBlock, optional: true},
{name: "mergeStartBlock", block: c.MergeForkBlock, optional: true},
} {
if lastFork.name != "" {
// Next one must be higher number
@ -594,6 +597,9 @@ func (c *ChainConfig) checkCompatible(newcfg *ChainConfig, head *big.Int) *Confi
if isForkIncompatible(c.ArrowGlacierBlock, newcfg.ArrowGlacierBlock, head) {
return newCompatError("Arrow Glacier fork block", c.ArrowGlacierBlock, newcfg.ArrowGlacierBlock)
}
if isForkIncompatible(c.MergeForkBlock, newcfg.MergeForkBlock, head) {
return newCompatError("Merge Start fork block", c.MergeForkBlock, newcfg.MergeForkBlock)
}
return nil
}

6
rpc/errors.go
Unescape View File

@ -104,10 +104,10 @@ func (e *invalidParamsError) ErrorCode() int { return -32602 }
func (e *invalidParamsError) Error() string { return e.message }
type CustomError struct {
Code int
Message string
Code int
ValidationError string
}
func (e *CustomError) ErrorCode() int { return e.Code }
func (e *CustomError) Error() string { return e.Message }
func (e *CustomError) Error() string { return e.ValidationError }

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