ipld-eth-server/pkg/ipfs/converter.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 ipfs
import (
"context"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/statediff"
"github.com/vulcanize/vulcanizedb/pkg/core"
)
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// PayloadConverter interface is used to convert a geth statediff.Payload to our IPLDPayload type
type PayloadConverter interface {
Convert(payload statediff.Payload) (*IPLDPayload, error)
}
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// Converter is the underlying struct for the PayloadConverter interface
type Converter struct {
client core.EthClient
}
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// NewPayloadConverter creates a pointer to a new Converter which satisfies the PayloadConverter interface
func NewPayloadConverter(client core.EthClient) *Converter {
return &Converter{
client: client,
}
}
// Convert method is used to convert a geth statediff.Payload to a IPLDPayload
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func (pc *Converter) Convert(payload statediff.Payload) (*IPLDPayload, error) {
// Unpack block rlp to access fields
block := new(types.Block)
err := rlp.DecodeBytes(payload.BlockRlp, block)
header := block.Header()
headerRlp, err := rlp.EncodeToBytes(header)
if err != nil {
return nil, err
}
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trxLen := len(block.Transactions())
convertedPayload := &IPLDPayload{
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BlockHash: block.Hash(),
BlockNumber: block.Number(),
HeaderRLP: headerRlp,
BlockBody: block.Body(),
TrxMetaData: make([]*TrxMetaData, 0, trxLen),
Receipts: make(types.Receipts, 0, trxLen),
ReceiptMetaData: make([]*ReceiptMetaData, 0, trxLen),
StateLeafs: make(map[common.Hash][]byte),
StorageLeafs: make(map[common.Hash]map[common.Hash][]byte),
}
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for gethTransactionIndex, trx := range block.Transactions() {
// Extract to and from data from the the transactions for indexing
from, err := pc.client.TransactionSender(context.Background(), trx, block.Hash(), uint(gethTransactionIndex))
if err != nil {
return nil, err
}
txMeta := &TrxMetaData{
To: trx.To().Hex(),
From: from.Hex(),
}
// txMeta will have same index as its corresponding trx in the convertedPayload.BlockBody
convertedPayload.TrxMetaData = append(convertedPayload.TrxMetaData, txMeta)
// Retrieve receipt for this transaction
gethReceipt, err := pc.client.TransactionReceipt(context.Background(), trx.Hash())
if err != nil {
return nil, err
}
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// Extract topic0 data from the receipt's logs for indexing
rctMeta := &ReceiptMetaData{
Topic0s: make([]string, 0, len(gethReceipt.Logs)),
}
for _, log := range gethReceipt.Logs {
if len(log.Topics[0]) < 1 {
continue
}
rctMeta.Topic0s = append(rctMeta.Topic0s, log.Topics[0].Hex())
}
// receipt and rctMeta will have same indexes
convertedPayload.Receipts = append(convertedPayload.Receipts, gethReceipt)
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convertedPayload.ReceiptMetaData = append(convertedPayload.ReceiptMetaData, rctMeta)
}
// Unpack state diff rlp to access fields
stateDiff := new(statediff.StateDiff)
err = rlp.DecodeBytes(payload.StateDiffRlp, stateDiff)
if err != nil {
return nil, err
}
for addr, createdAccount := range stateDiff.CreatedAccounts {
convertedPayload.StateLeafs[addr] = createdAccount.Value
convertedPayload.StorageLeafs[addr] = make(map[common.Hash][]byte)
for _, storageDiff := range createdAccount.Storage {
convertedPayload.StorageLeafs[addr][common.BytesToHash(storageDiff.Key)] = storageDiff.Value
}
}
for addr, deletedAccount := range stateDiff.DeletedAccounts {
convertedPayload.StateLeafs[addr] = deletedAccount.Value
convertedPayload.StorageLeafs[addr] = make(map[common.Hash][]byte)
for _, storageDiff := range deletedAccount.Storage {
convertedPayload.StorageLeafs[addr][common.BytesToHash(storageDiff.Key)] = storageDiff.Value
}
}
for addr, updatedAccount := range stateDiff.UpdatedAccounts {
convertedPayload.StateLeafs[addr] = updatedAccount.Value
convertedPayload.StorageLeafs[addr] = make(map[common.Hash][]byte)
for _, storageDiff := range updatedAccount.Storage {
convertedPayload.StorageLeafs[addr][common.BytesToHash(storageDiff.Key)] = storageDiff.Value
}
}
return convertedPayload, nil
}