ipld-eth-server/pkg/eth/backend_utils.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 eth
import (
"context"
"encoding/json"
"fmt"
"github.com/ethereum/go-ethereum/params"
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"math/big"
"github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/rpc"
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"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/rlp"
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"github.com/vulcanize/ipld-eth-indexer/pkg/ipfs"
)
// RPCMarshalHeader converts the given header to the RPC output.
// This function is eth/internal so we have to make our own version here...
func RPCMarshalHeader(head *types.Header) map[string]interface{} {
return map[string]interface{}{
"number": (*hexutil.Big)(head.Number),
"hash": head.Hash(),
"parentHash": head.ParentHash,
"nonce": head.Nonce,
"mixHash": head.MixDigest,
"sha3Uncles": head.UncleHash,
"logsBloom": head.Bloom,
"stateRoot": head.Root,
"miner": head.Coinbase,
"difficulty": (*hexutil.Big)(head.Difficulty),
"extraData": hexutil.Bytes(head.Extra),
"size": hexutil.Uint64(head.Size()),
"gasLimit": hexutil.Uint64(head.GasLimit),
"gasUsed": hexutil.Uint64(head.GasUsed),
"timestamp": hexutil.Uint64(head.Time),
"transactionsRoot": head.TxHash,
"receiptsRoot": head.ReceiptHash,
}
}
// RPCMarshalBlock converts the given block to the RPC output which depends on fullTx. If inclTx is true transactions are
// returned. When fullTx is true the returned block contains full transaction details, otherwise it will only contain
// transaction hashes.
func RPCMarshalBlock(block *types.Block, inclTx bool, fullTx bool) (map[string]interface{}, error) {
fields := RPCMarshalHeader(block.Header())
fields["size"] = hexutil.Uint64(block.Size())
if inclTx {
formatTx := func(tx *types.Transaction) (interface{}, error) {
return tx.Hash(), nil
}
if fullTx {
formatTx = func(tx *types.Transaction) (interface{}, error) {
return NewRPCTransactionFromBlockHash(block, tx.Hash()), nil
}
}
txs := block.Transactions()
transactions := make([]interface{}, len(txs))
var err error
for i, tx := range txs {
if transactions[i], err = formatTx(tx); err != nil {
return nil, err
}
}
fields["transactions"] = transactions
}
uncles := block.Uncles()
uncleHashes := make([]common.Hash, len(uncles))
for i, uncle := range uncles {
uncleHashes[i] = uncle.Hash()
}
fields["uncles"] = uncleHashes
return fields, nil
}
// RPCMarshalBlockWithUncleHashes marshals the block with the provided uncle hashes
func RPCMarshalBlockWithUncleHashes(block *types.Block, uncleHashes []common.Hash, inclTx bool, fullTx bool) (map[string]interface{}, error) {
fields := RPCMarshalHeader(block.Header())
fields["size"] = hexutil.Uint64(block.Size())
if inclTx {
formatTx := func(tx *types.Transaction) (interface{}, error) {
return tx.Hash(), nil
}
if fullTx {
formatTx = func(tx *types.Transaction) (interface{}, error) {
return NewRPCTransactionFromBlockHash(block, tx.Hash()), nil
}
}
txs := block.Transactions()
transactions := make([]interface{}, len(txs))
var err error
for i, tx := range txs {
if transactions[i], err = formatTx(tx); err != nil {
return nil, err
}
}
fields["transactions"] = transactions
}
fields["uncles"] = uncleHashes
return fields, nil
}
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// NewRPCTransactionFromBlockHash returns a transaction that will serialize to the RPC representation.
func NewRPCTransactionFromBlockHash(b *types.Block, hash common.Hash) *RPCTransaction {
for idx, tx := range b.Transactions() {
if tx.Hash() == hash {
return newRPCTransactionFromBlockIndex(b, uint64(idx))
}
}
return nil
}
// NewRPCTransaction returns a transaction that will serialize to the RPC
// representation, with the given location metadata set (if available).
func NewRPCTransaction(tx *types.Transaction, blockHash common.Hash, blockNumber uint64, index uint64) *RPCTransaction {
var signer types.Signer = types.FrontierSigner{}
if tx.Protected() {
signer = types.NewEIP155Signer(tx.ChainId())
}
from, _ := types.Sender(signer, tx)
v, r, s := tx.RawSignatureValues()
result := &RPCTransaction{
From: from,
Gas: hexutil.Uint64(tx.Gas()),
GasPrice: (*hexutil.Big)(tx.GasPrice()),
Hash: tx.Hash(),
Input: hexutil.Bytes(tx.Data()), // somehow this is ending up `nil`
Nonce: hexutil.Uint64(tx.Nonce()),
To: tx.To(),
Value: (*hexutil.Big)(tx.Value()),
V: (*hexutil.Big)(v),
R: (*hexutil.Big)(r),
S: (*hexutil.Big)(s),
}
if blockHash != (common.Hash{}) {
result.BlockHash = &blockHash
result.BlockNumber = (*hexutil.Big)(new(big.Int).SetUint64(blockNumber))
result.TransactionIndex = (*hexutil.Uint64)(&index)
}
return result
}
type rpcBlock struct {
Hash common.Hash `json:"hash"`
Transactions []rpcTransaction `json:"transactions"`
UncleHashes []common.Hash `json:"uncles"`
}
type rpcTransaction struct {
tx *types.Transaction
txExtraInfo
}
type txExtraInfo struct {
BlockNumber *string `json:"blockNumber,omitempty"`
BlockHash *common.Hash `json:"blockHash,omitempty"`
From *common.Address `json:"from,omitempty"`
}
func (tx *rpcTransaction) UnmarshalJSON(msg []byte) error {
if err := json.Unmarshal(msg, &tx.tx); err != nil {
return err
}
return json.Unmarshal(msg, &tx.txExtraInfo)
}
func getBlockAndUncleHashes(cli *rpc.Client, ctx context.Context, method string, args ...interface{}) (*types.Block, []common.Hash, error) {
var raw json.RawMessage
err := cli.CallContext(ctx, &raw, method, args...)
if err != nil {
return nil, nil, err
} else if len(raw) == 0 {
return nil, nil, ethereum.NotFound
}
// Decode header and transactions.
var head *types.Header
var body rpcBlock
if err := json.Unmarshal(raw, &head); err != nil {
return nil, nil, err
}
if err := json.Unmarshal(raw, &body); err != nil {
return nil, nil, err
}
// Quick-verify transaction and uncle lists. This mostly helps with debugging the server.
if head.UncleHash == types.EmptyUncleHash && len(body.UncleHashes) > 0 {
return nil, nil, fmt.Errorf("server returned non-empty uncle list but block header indicates no uncles")
}
if head.UncleHash != types.EmptyUncleHash && len(body.UncleHashes) == 0 {
return nil, nil, fmt.Errorf("server returned empty uncle list but block header indicates uncles")
}
if head.TxHash == types.EmptyRootHash && len(body.Transactions) > 0 {
return nil, nil, fmt.Errorf("server returned non-empty transaction list but block header indicates no transactions")
}
if head.TxHash != types.EmptyRootHash && len(body.Transactions) == 0 {
return nil, nil, fmt.Errorf("server returned empty transaction list but block header indicates transactions")
}
txs := make([]*types.Transaction, len(body.Transactions))
for i, tx := range body.Transactions {
txs[i] = tx.tx
}
return types.NewBlockWithHeader(head).WithBody(txs, nil), body.UncleHashes, nil
}
// newRPCRawTransactionFromBlockIndex returns the bytes of a transaction given a block and a transaction index.
func newRPCRawTransactionFromBlockIndex(b *types.Block, index uint64) hexutil.Bytes {
txs := b.Transactions()
if index >= uint64(len(txs)) {
return nil
}
blob, _ := rlp.EncodeToBytes(txs[index])
return blob
}
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// newRPCTransactionFromBlockIndex returns a transaction that will serialize to the RPC representation.
func newRPCTransactionFromBlockIndex(b *types.Block, index uint64) *RPCTransaction {
txs := b.Transactions()
if index >= uint64(len(txs)) {
return nil
}
return NewRPCTransaction(txs[index], b.Hash(), b.NumberU64(), index)
}
// extractLogsOfInterest returns logs from the receipt IPLD
func extractLogsOfInterest(config *params.ChainConfig, blockHash common.Hash, blockNumber uint64, txs types.Transactions, rctIPLDs []ipfs.BlockModel, wantedTopics [][]string) ([]*types.Log, error) {
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var logs []*types.Log
receipts := make(types.Receipts, len(rctIPLDs))
for i, rctBytes := range rctIPLDs {
rct := new(types.Receipt)
if err := rlp.DecodeBytes(rctBytes.Data, rct); err != nil {
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return nil, err
}
receipts[i] = rct
}
err := receipts.DeriveFields(config, blockHash, blockNumber, txs)
if err != nil {
return nil, err
}
for _, receipt := range receipts {
for _, log := range receipt.Logs {
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if wanted := wantedLog(wantedTopics, log.Topics); wanted == true {
logs = append(logs, log)
}
}
}
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return logs, nil
}
// returns true if the log matches on the filter
func wantedLog(wantedTopics [][]string, actualTopics []common.Hash) bool {
// actualTopics will always have length <= 4
// wantedTopics will always have length 4
matches := 0
for i, actualTopic := range actualTopics {
// If we have topics in this filter slot, count as a match if the actualTopic matches one of the ones in this filter slot
if len(wantedTopics[i]) > 0 {
matches += sliceContainsHash(wantedTopics[i], actualTopic)
} else {
// Filter slot is empty, not matching any topics at this slot => counts as a match
matches++
}
}
if matches == len(actualTopics) {
return true
}
return false
}
// returns 1 if the slice contains the hash, 0 if it does not
func sliceContainsHash(slice []string, hash common.Hash) int {
for _, str := range slice {
if str == hash.String() {
return 1
}
}
return 0
}
func toFilterArg(q ethereum.FilterQuery) (interface{}, error) {
arg := map[string]interface{}{
"address": q.Addresses,
"topics": q.Topics,
}
if q.BlockHash != nil {
arg["blockHash"] = *q.BlockHash
if q.FromBlock != nil || q.ToBlock != nil {
return nil, fmt.Errorf("cannot specify both BlockHash and FromBlock/ToBlock")
}
} else {
if q.FromBlock == nil {
arg["fromBlock"] = "0x0"
} else {
arg["fromBlock"] = toBlockNumArg(q.FromBlock)
}
arg["toBlock"] = toBlockNumArg(q.ToBlock)
}
return arg, nil
}
func toBlockNumArg(number *big.Int) string {
if number == nil {
return "latest"
}
return hexutil.EncodeBig(number)
}