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api.go
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api.go
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// Copyright 2020 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Package catalyst implements the temporary eth1/eth2 RPC integration.
package catalyst
import (
"errors"
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/consensus/misc"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/node"
chainParams "github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rpc"
"github.com/ethereum/go-ethereum/trie"
)
// Register adds catalyst APIs to the node.
func Register(stack *node.Node, backend *eth.Ethereum) error {
chainconfig := backend.BlockChain().Config()
if chainconfig.CatalystBlock == nil {
return errors.New("catalystBlock is not set in genesis config")
} else if chainconfig.CatalystBlock.Sign() != 0 {
return errors.New("catalystBlock of genesis config must be zero")
}
log.Warn("Catalyst mode enabled")
stack.RegisterAPIs([]rpc.API{
{
Namespace: "consensus",
Version: "1.0",
Service: newConsensusAPI(backend),
Public: true,
},
})
return nil
}
type consensusAPI struct {
eth *eth.Ethereum
}
func newConsensusAPI(eth *eth.Ethereum) *consensusAPI {
return &consensusAPI{eth: eth}
}
// AssembleBlock creates a new block, inserts it into the chain, and returns the "execution
// data" required for eth2 clients to process the new block.
func (api *consensusAPI) AssembleBlock(params assembleBlockParams) (*executableData, error) {
log.Info("Producing block", "parentHash", params.ParentHash)
block, err := api.eth.Miner().GetSealingBlock(params.ParentHash, params.Timestamp)
if err != nil {
return nil, err
}
return &executableData{
BlockHash: block.Hash(),
ParentHash: block.ParentHash(),
Miner: block.Coinbase(),
StateRoot: block.Root(),
Number: block.NumberU64(),
GasLimit: block.GasLimit(),
GasUsed: block.GasUsed(),
Timestamp: block.Time(),
ReceiptRoot: block.ReceiptHash(),
LogsBloom: block.Bloom().Bytes(),
Transactions: encodeTransactions(block.Transactions()),
}, nil
}
func encodeTransactions(txs []*types.Transaction) [][]byte {
var enc = make([][]byte, len(txs))
for i, tx := range txs {
enc[i], _ = tx.MarshalBinary()
}
return enc
}
func decodeTransactions(enc [][]byte) ([]*types.Transaction, error) {
var txs = make([]*types.Transaction, len(enc))
for i, encTx := range enc {
var tx types.Transaction
if err := tx.UnmarshalBinary(encTx); err != nil {
return nil, fmt.Errorf("invalid transaction %d: %v", i, err)
}
txs[i] = &tx
}
return txs, nil
}
func insertBlockParamsToBlock(config *chainParams.ChainConfig, parent *types.Header, params executableData) (*types.Block, error) {
txs, err := decodeTransactions(params.Transactions)
if err != nil {
return nil, err
}
number := big.NewInt(0)
number.SetUint64(params.Number)
header := &types.Header{
ParentHash: params.ParentHash,
UncleHash: types.EmptyUncleHash,
Coinbase: params.Miner,
Root: params.StateRoot,
TxHash: types.DeriveSha(types.Transactions(txs), trie.NewStackTrie(nil)),
ReceiptHash: params.ReceiptRoot,
Bloom: types.BytesToBloom(params.LogsBloom),
Difficulty: big.NewInt(1),
Number: number,
GasLimit: params.GasLimit,
GasUsed: params.GasUsed,
Time: params.Timestamp,
}
if config.IsLondon(number) {
header.BaseFee = misc.CalcBaseFee(config, parent)
}
block := types.NewBlockWithHeader(header).WithBody(txs, nil /* uncles */)
return block, nil
}
// NewBlock creates an Eth1 block, inserts it in the chain, and either returns true,
// or false + an error. This is a bit redundant for go, but simplifies things on the
// eth2 side.
func (api *consensusAPI) NewBlock(params executableData) (*newBlockResponse, error) {
parent := api.eth.BlockChain().GetBlockByHash(params.ParentHash)
if parent == nil {
return &newBlockResponse{false}, fmt.Errorf("could not find parent %x", params.ParentHash)
}
block, err := insertBlockParamsToBlock(api.eth.BlockChain().Config(), parent.Header(), params)
if err != nil {
return nil, err
}
_, err = api.eth.BlockChain().InsertChainWithoutSealVerification(block)
return &newBlockResponse{err == nil}, err
}
// Used in tests to add a the list of transactions from a block to the tx pool.
func (api *consensusAPI) addBlockTxs(block *types.Block) error {
for _, tx := range block.Transactions() {
api.eth.TxPool().AddLocal(tx)
}
return nil
}
// FinalizeBlock is called to mark a block as synchronized, so
// that data that is no longer needed can be removed.
func (api *consensusAPI) FinalizeBlock(blockHash common.Hash) (*genericResponse, error) {
return &genericResponse{true}, nil
}
// SetHead is called to perform a force choice.
func (api *consensusAPI) SetHead(newHead common.Hash) (*genericResponse, error) {
return &genericResponse{true}, nil
}