mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
synced 2024-12-22 19:50:36 +00:00
300 lines
8.3 KiB
Go
300 lines
8.3 KiB
Go
package jsonrpc
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import (
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"bytes"
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"context"
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"fmt"
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"sort"
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"github.com/ledgerwatch/erigon-lib/common"
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"github.com/ledgerwatch/erigon-lib/common/cmp"
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"github.com/ledgerwatch/erigon-lib/kv"
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"github.com/ledgerwatch/erigon-lib/kv/bitmapdb"
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"github.com/ledgerwatch/erigon-lib/kv/order"
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"github.com/ledgerwatch/erigon-lib/kv/rawdbv3"
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"github.com/ledgerwatch/erigon-lib/kv/temporal/historyv2"
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"github.com/ledgerwatch/log/v3"
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"github.com/ledgerwatch/erigon/core/types/accounts"
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"github.com/ledgerwatch/erigon/turbo/rpchelper"
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)
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type ContractCreatorData struct {
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Tx common.Hash `json:"hash"`
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Creator common.Address `json:"creator"`
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}
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func (api *OtterscanAPIImpl) GetContractCreator(ctx context.Context, addr common.Address) (*ContractCreatorData, error) {
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tx, err := api.db.BeginRo(ctx)
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if err != nil {
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return nil, err
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}
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defer tx.Rollback()
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latestState := rpchelper.NewLatestStateReader(tx)
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plainStateAcc, err := latestState.ReadAccountData(addr)
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if err != nil {
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return nil, err
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}
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// No state == non existent
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if plainStateAcc == nil {
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return nil, nil
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}
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// EOA?
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if plainStateAcc.IsEmptyCodeHash() {
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return nil, nil
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}
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chainConfig, err := api.chainConfig(tx)
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if err != nil {
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return nil, err
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}
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var acc accounts.Account
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if api.historyV3(tx) {
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ttx := tx.(kv.TemporalTx)
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// Contract; search for creation tx; navigate forward on AccountsHistory/ChangeSets
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//
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// We traversing history Index - because it's cheaper than traversing History
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// and probe History periodically. In result will have small range of blocks. For binary search or full-scan.
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//
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// popular contracts may have dozens of states changes due to ETH deposits/withdraw after contract creation,
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// so it is optimal to search from the beginning even if the contract has multiple
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// incarnations.
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var prevTxnID, nextTxnID uint64
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it, err := ttx.IndexRange(kv.AccountsHistoryIdx, addr[:], 0, -1, order.Asc, kv.Unlim)
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if err != nil {
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return nil, err
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}
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for i := 0; it.HasNext(); i++ {
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txnID, err := it.Next()
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if err != nil {
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return nil, err
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}
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if i%4096 != 0 { // probe history periodically, not on every change
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nextTxnID = txnID
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continue
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}
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v, ok, err := ttx.HistoryGet(kv.AccountsHistory, addr[:], txnID)
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if err != nil {
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log.Error("Unexpected error, couldn't find changeset", "txNum", txnID, "addr", addr)
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return nil, err
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}
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if !ok {
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err = fmt.Errorf("couldn't find history txnID=%v addr=%v", txnID, addr)
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log.Error("[rpc] Unexpected error", "err", err)
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return nil, err
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}
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if len(v) == 0 { // creation, but maybe not our Incarnation
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prevTxnID = txnID
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continue
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}
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if err := accounts.DeserialiseV3(&acc, v); err != nil {
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return nil, err
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}
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// Found the shard where the incarnation change happens; ignore all next index values
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if acc.Incarnation >= plainStateAcc.Incarnation {
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nextTxnID = txnID
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break
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}
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prevTxnID = txnID
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}
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// The sort.Search function finds the first block where the incarnation has
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// changed to the desired one, so we get the previous block from the bitmap;
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// however if the creationTxnID block is already the first one from the bitmap, it means
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// the block we want is the max block from the previous shard.
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var creationTxnID uint64
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var searchErr error
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if nextTxnID == 0 {
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nextTxnID = prevTxnID + 1
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}
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// Binary search in [prevTxnID, nextTxnID] range; get first block where desired incarnation appears
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// can be replaced by full-scan over ttx.HistoryRange([prevTxnID, nextTxnID])?
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idx := sort.Search(int(nextTxnID-prevTxnID), func(i int) bool {
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txnID := uint64(i) + prevTxnID
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v, ok, err := ttx.HistoryGet(kv.AccountsHistory, addr[:], txnID)
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if err != nil {
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log.Error("[rpc] Unexpected error, couldn't find changeset", "txNum", i, "addr", addr)
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panic(err)
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}
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if !ok {
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return false
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}
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if len(v) == 0 {
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creationTxnID = cmp.Max(creationTxnID, txnID)
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return false
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}
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if err := accounts.DeserialiseV3(&acc, v); err != nil {
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searchErr = err
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return false
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}
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if acc.Incarnation < plainStateAcc.Incarnation {
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creationTxnID = cmp.Max(creationTxnID, txnID)
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return false
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}
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return true
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})
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if searchErr != nil {
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return nil, searchErr
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}
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if creationTxnID == 0 {
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return nil, fmt.Errorf("binary search between %d-%d doesn't find anything", nextTxnID, prevTxnID)
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}
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ok, bn, err := rawdbv3.TxNums.FindBlockNum(tx, creationTxnID)
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if err != nil {
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return nil, err
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}
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if !ok {
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return nil, fmt.Errorf("block not found by txnID=%d", creationTxnID)
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}
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minTxNum, err := rawdbv3.TxNums.Min(tx, bn)
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if err != nil {
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return nil, err
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}
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txIndex := int(creationTxnID) - int(minTxNum) - 1 /* system-contract */
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if txIndex == -1 {
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txIndex = (idx + int(prevTxnID)) - int(minTxNum) - 1
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}
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// Trace block, find tx and contract creator
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tracer := NewCreateTracer(ctx, addr)
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if err := api.genericTracer(tx, ctx, bn, creationTxnID, txIndex, chainConfig, tracer); err != nil {
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return nil, err
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}
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return &ContractCreatorData{
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Tx: tracer.Tx.Hash(),
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Creator: tracer.Creator,
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}, nil
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}
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// Contract; search for creation tx; navigate forward on AccountsHistory/ChangeSets
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//
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// We search shards in forward order on purpose because popular contracts may have
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// dozens of states changes due to ETH deposits/withdraw after contract creation,
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// so it is optimal to search from the beginning even if the contract has multiple
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// incarnations.
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accHistory, err := tx.Cursor(kv.E2AccountsHistory)
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if err != nil {
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return nil, err
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}
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defer accHistory.Close()
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accCS, err := tx.CursorDupSort(kv.AccountChangeSet)
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if err != nil {
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return nil, err
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}
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defer accCS.Close()
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// Locate shard that contains the block where incarnation changed
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acs := historyv2.Mapper[kv.AccountChangeSet]
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k, v, err := accHistory.Seek(acs.IndexChunkKey(addr.Bytes(), 0))
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if err != nil {
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return nil, err
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}
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if !bytes.HasPrefix(k, addr.Bytes()) {
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log.Error("Couldn't find any shard for account history", "addr", addr)
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return nil, fmt.Errorf("could't find any shard for account history addr=%v", addr)
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}
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bm := bitmapdb.NewBitmap64()
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defer bitmapdb.ReturnToPool64(bm)
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prevShardMaxBl := uint64(0)
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for {
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_, err := bm.ReadFrom(bytes.NewReader(v))
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if err != nil {
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return nil, err
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}
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// Shortcut precheck
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st, err := acs.Find(accCS, bm.Maximum(), addr.Bytes())
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if err != nil {
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return nil, err
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}
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if st == nil {
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log.Error("Unexpected error, couldn't find changeset", "block", bm.Maximum(), "addr", addr)
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return nil, fmt.Errorf("unexpected error, couldn't find changeset block=%v addr=%v", bm.Maximum(), addr)
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}
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// Found the shard where the incarnation change happens; ignore all
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// next shards
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if err := acc.DecodeForStorage(st); err != nil {
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return nil, err
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}
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if acc.Incarnation >= plainStateAcc.Incarnation {
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break
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}
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prevShardMaxBl = bm.Maximum()
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k, v, err = accHistory.Next()
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if err != nil {
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return nil, err
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}
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// No more shards; it means the max bl from previous shard
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// contains the incarnation change
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if !bytes.HasPrefix(k, addr.Bytes()) {
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break
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}
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}
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// Binary search block number inside shard; get first block where desired
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// incarnation appears
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blocks := bm.ToArray()
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var searchErr error
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r := sort.Search(len(blocks), func(i int) bool {
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bl := blocks[i]
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st, err := acs.Find(accCS, bl, addr.Bytes())
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if err != nil {
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searchErr = err
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return false
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}
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if st == nil {
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log.Error("Unexpected error, couldn't find changeset", "block", bl, "addr", addr)
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return false
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}
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if err := acc.DecodeForStorage(st); err != nil {
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searchErr = err
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return false
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}
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if acc.Incarnation < plainStateAcc.Incarnation {
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return false
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}
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return true
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})
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if searchErr != nil {
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return nil, searchErr
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}
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// The sort.Search function finds the first block where the incarnation has
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// changed to the desired one, so we get the previous block from the bitmap;
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// however if the found block is already the first one from the bitmap, it means
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// the block we want is the max block from the previous shard.
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blockFound := prevShardMaxBl
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if r > 0 {
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blockFound = blocks[r-1]
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}
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// Trace block, find tx and contract creator
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tracer := NewCreateTracer(ctx, addr)
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if err := api.genericTracer(tx, ctx, blockFound, 0, 0, chainConfig, tracer); err != nil {
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return nil, err
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}
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return &ContractCreatorData{
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Tx: tracer.Tx.Hash(),
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Creator: tracer.Creator,
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}, nil
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}
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