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blockchain.go
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blockchain.go
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// VulcanizeDB
// Copyright © 2019 Vulcanize
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program 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 Affero General Public License for more details.
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package geth
import (
"errors"
"github.com/ethereum/go-ethereum"
"math/big"
"strconv"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/types"
"golang.org/x/net/context"
"github.com/vulcanize/vulcanizedb/pkg/core"
"github.com/vulcanize/vulcanizedb/pkg/geth/client"
vulcCommon "github.com/vulcanize/vulcanizedb/pkg/geth/converters/common"
)
var ErrEmptyHeader = errors.New("empty header returned over RPC")
const MAX_BATCH_SIZE = 100
type BlockChain struct {
blockConverter vulcCommon.BlockConverter
ethClient core.EthClient
headerConverter vulcCommon.HeaderConverter
node core.Node
rpcClient core.RpcClient
transactionConverter vulcCommon.TransactionConverter
}
func NewBlockChain(ethClient core.EthClient, rpcClient core.RpcClient, node core.Node, converter vulcCommon.TransactionConverter) *BlockChain {
return &BlockChain{
blockConverter: vulcCommon.NewBlockConverter(converter),
ethClient: ethClient,
headerConverter: vulcCommon.HeaderConverter{},
node: node,
rpcClient: rpcClient,
transactionConverter: converter,
}
}
func (blockChain *BlockChain) GetBlockByNumber(blockNumber int64) (block core.Block, err error) {
gethBlock, err := blockChain.ethClient.BlockByNumber(context.Background(), big.NewInt(blockNumber))
if err != nil {
return block, err
}
return blockChain.blockConverter.ToCoreBlock(gethBlock)
}
func (blockChain *BlockChain) GetEthLogsWithCustomQuery(query ethereum.FilterQuery) ([]types.Log, error) {
gethLogs, err := blockChain.ethClient.FilterLogs(context.Background(), query)
if err != nil {
return []types.Log{}, err
}
return gethLogs, nil
}
func (blockChain *BlockChain) GetHeaderByNumber(blockNumber int64) (header core.Header, err error) {
if blockChain.node.NetworkID == core.KOVAN_NETWORK_ID {
return blockChain.getPOAHeader(blockNumber)
}
return blockChain.getPOWHeader(blockNumber)
}
func (blockChain *BlockChain) GetHeadersByNumbers(blockNumbers []int64) (header []core.Header, err error) {
if blockChain.node.NetworkID == core.KOVAN_NETWORK_ID {
return blockChain.getPOAHeaders(blockNumbers)
}
return blockChain.getPOWHeaders(blockNumbers)
}
func (blockChain *BlockChain) GetLogs(contract core.Contract, startingBlockNumber, endingBlockNumber *big.Int) ([]core.Log, error) {
if endingBlockNumber == nil {
endingBlockNumber = startingBlockNumber
}
contractAddress := common.HexToAddress(contract.Hash)
fc := ethereum.FilterQuery{
FromBlock: startingBlockNumber,
ToBlock: endingBlockNumber,
Addresses: []common.Address{contractAddress},
Topics: nil,
}
gethLogs, err := blockChain.GetEthLogsWithCustomQuery(fc)
if err != nil {
return []core.Log{}, err
}
logs := vulcCommon.ToCoreLogs(gethLogs)
return logs, nil
}
func (blockChain *BlockChain) GetTransactions(transactionHashes []common.Hash) ([]core.TransactionModel, error) {
numTransactions := len(transactionHashes)
var batch []client.BatchElem
transactions := make([]core.RpcTransaction, numTransactions)
for index, transactionHash := range transactionHashes {
batchElem := client.BatchElem{
Method: "eth_getTransactionByHash",
Result: &transactions[index],
Args: []interface{}{transactionHash},
}
batch = append(batch, batchElem)
}
rpcErr := blockChain.rpcClient.BatchCall(batch)
if rpcErr != nil {
return []core.TransactionModel{}, rpcErr
}
return blockChain.transactionConverter.ConvertRpcTransactionsToModels(transactions)
}
func (blockChain *BlockChain) LastBlock() (*big.Int, error) {
block, err := blockChain.ethClient.HeaderByNumber(context.Background(), nil)
if err != nil {
return big.NewInt(0), err
}
return block.Number, err
}
func (blockChain *BlockChain) Node() core.Node {
return blockChain.node
}
func (blockChain *BlockChain) getPOAHeader(blockNumber int64) (header core.Header, err error) {
var POAHeader core.POAHeader
blockNumberArg := hexutil.EncodeBig(big.NewInt(blockNumber))
includeTransactions := false
err = blockChain.rpcClient.CallContext(context.Background(), &POAHeader, "eth_getBlockByNumber", blockNumberArg, includeTransactions)
if err != nil {
return header, err
}
if POAHeader.Number == nil {
return header, ErrEmptyHeader
}
return blockChain.headerConverter.Convert(&types.Header{
ParentHash: POAHeader.ParentHash,
UncleHash: POAHeader.UncleHash,
Coinbase: POAHeader.Coinbase,
Root: POAHeader.Root,
TxHash: POAHeader.TxHash,
ReceiptHash: POAHeader.ReceiptHash,
Bloom: POAHeader.Bloom,
Difficulty: POAHeader.Difficulty.ToInt(),
Number: POAHeader.Number.ToInt(),
GasLimit: uint64(POAHeader.GasLimit),
GasUsed: uint64(POAHeader.GasUsed),
Time: POAHeader.Time.ToInt(),
Extra: POAHeader.Extra,
}, POAHeader.Hash.String()), nil
}
func (blockChain *BlockChain) getPOAHeaders(blockNumbers []int64) (headers []core.Header, err error) {
var batch []client.BatchElem
var POAHeaders [MAX_BATCH_SIZE]core.POAHeader
includeTransactions := false
for index, blockNumber := range blockNumbers {
if index >= MAX_BATCH_SIZE {
break
}
blockNumberArg := hexutil.EncodeBig(big.NewInt(blockNumber))
batchElem := client.BatchElem{
Method: "eth_getBlockByNumber",
Result: &POAHeaders[index],
Args: []interface{}{blockNumberArg, includeTransactions},
}
batch = append(batch, batchElem)
}
err = blockChain.rpcClient.BatchCall(batch)
if err != nil {
return headers, err
}
for _, POAHeader := range POAHeaders {
var header core.Header
//Header.Number of the newest block will return nil.
if _, err := strconv.ParseUint(POAHeader.Number.ToInt().String(), 16, 64); err == nil {
header = blockChain.headerConverter.Convert(&types.Header{
ParentHash: POAHeader.ParentHash,
UncleHash: POAHeader.UncleHash,
Coinbase: POAHeader.Coinbase,
Root: POAHeader.Root,
TxHash: POAHeader.TxHash,
ReceiptHash: POAHeader.ReceiptHash,
Bloom: POAHeader.Bloom,
Difficulty: POAHeader.Difficulty.ToInt(),
Number: POAHeader.Number.ToInt(),
GasLimit: uint64(POAHeader.GasLimit),
GasUsed: uint64(POAHeader.GasUsed),
Time: POAHeader.Time.ToInt(),
Extra: POAHeader.Extra,
}, POAHeader.Hash.String())
headers = append(headers, header)
}
}
return headers, err
}
func (blockChain *BlockChain) getPOWHeader(blockNumber int64) (header core.Header, err error) {
gethHeader, err := blockChain.ethClient.HeaderByNumber(context.Background(), big.NewInt(blockNumber))
if err != nil {
return header, err
}
return blockChain.headerConverter.Convert(gethHeader, gethHeader.Hash().String()), nil
}
func (blockChain *BlockChain) getPOWHeaders(blockNumbers []int64) (headers []core.Header, err error) {
var batch []client.BatchElem
var POWHeaders [MAX_BATCH_SIZE]types.Header
includeTransactions := false
for index, blockNumber := range blockNumbers {
if index >= MAX_BATCH_SIZE {
break
}
blockNumberArg := hexutil.EncodeBig(big.NewInt(blockNumber))
batchElem := client.BatchElem{
Method: "eth_getBlockByNumber",
Result: &POWHeaders[index],
Args: []interface{}{blockNumberArg, includeTransactions},
}
batch = append(batch, batchElem)
}
err = blockChain.rpcClient.BatchCall(batch)
if err != nil {
return headers, err
}
for _, POWHeader := range POWHeaders {
if POWHeader.Number != nil {
header := blockChain.headerConverter.Convert(&POWHeader, POWHeader.Hash().String())
headers = append(headers, header)
}
}
return headers, err
}
func (blockChain *BlockChain) GetAccountBalance(address common.Address, blockNumber *big.Int) (*big.Int, error) {
return blockChain.ethClient.BalanceAt(context.Background(), address, blockNumber)
}