ipld-eth-server/pkg/geth/blockchain.go

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// VulcanizeDB
// Copyright © 2018 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
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import (
"errors"
"math/big"
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"github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/types"
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"golang.org/x/net/context"
"github.com/vulcanize/vulcanizedb/pkg/core"
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vulcCommon "github.com/vulcanize/vulcanizedb/pkg/geth/converters/common"
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)
var ErrEmptyHeader = errors.New("empty header returned over RPC")
type BlockChain struct {
blockConverter vulcCommon.BlockConverter
ethClient core.EthClient
headerConverter vulcCommon.HeaderConverter
node core.Node
rpcClient core.RpcClient
}
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,
}
}
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) 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) 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())
}
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())
}
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
}
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logs := vulcCommon.ToCoreLogs(gethLogs)
return logs, nil
}
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) LastBlock() *big.Int {
block, _ := blockChain.ethClient.HeaderByNumber(context.Background(), nil)
return block.Number
}
func (blockChain *BlockChain) Node() core.Node {
return blockChain.node
}