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// Copyright 2021 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package core
import (
"errors"
"math/big"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/consensus"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/state/snapshot"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/triedb"
)
// CurrentHeader retrieves the current head header of the canonical chain. The
// header is retrieved from the HeaderChain's internal cache.
func (bc *BlockChain) CurrentHeader() *types.Header {
return bc.hc.CurrentHeader()
}
// CurrentBlock retrieves the current head block of the canonical chain. The
// block is retrieved from the blockchain's internal cache.
func (bc *BlockChain) CurrentBlock() *types.Header {
return bc.currentBlock.Load()
}
// CurrentSnapBlock retrieves the current snap-sync head block of the canonical
// chain. The block is retrieved from the blockchain's internal cache.
func (bc *BlockChain) CurrentSnapBlock() *types.Header {
return bc.currentSnapBlock.Load()
}
// CurrentFinalBlock retrieves the current finalized block of the canonical
// chain. The block is retrieved from the blockchain's internal cache.
func (bc *BlockChain) CurrentFinalBlock() *types.Header {
if p, ok := bc.engine.(consensus.PoSA); ok {
currentHeader := bc.CurrentHeader()
if currentHeader == nil {
return nil
}
return p.GetFinalizedHeader(bc, currentHeader)
}
return nil
}
// CurrentSafeBlock retrieves the current safe block of the canonical
// chain. The block is retrieved from the blockchain's internal cache.
func (bc *BlockChain) CurrentSafeBlock() *types.Header {
if p, ok := bc.engine.(consensus.PoSA); ok {
currentHeader := bc.CurrentHeader()
if currentHeader == nil {
return nil
}
_, justifiedBlockHash, err := p.GetJustifiedNumberAndHash(bc, []*types.Header{currentHeader})
if err == nil {
return bc.GetHeaderByHash(justifiedBlockHash)
}
}
return nil
}
// HasHeader checks if a block header is present in the database or not, caching
// it if present.
func (bc *BlockChain) HasHeader(hash common.Hash, number uint64) bool {
return bc.hc.HasHeader(hash, number)
}
// GetHeader retrieves a block header from the database by hash and number,
// caching it if found.
func (bc *BlockChain) GetHeader(hash common.Hash, number uint64) *types.Header {
return bc.hc.GetHeader(hash, number)
}
// GetHeaderByHash retrieves a block header from the database by hash, caching it if
// found.
func (bc *BlockChain) GetHeaderByHash(hash common.Hash) *types.Header {
return bc.hc.GetHeaderByHash(hash)
}
// GetVerifiedBlockByHash retrieves the header of a verified block, it may be only in memory.
func (bc *BlockChain) GetVerifiedBlockByHash(hash common.Hash) *types.Header {
highestVerifiedBlock := bc.highestVerifiedBlock.Load()
if highestVerifiedBlock != nil && highestVerifiedBlock.Hash() == hash {
return highestVerifiedBlock
}
return bc.hc.GetHeaderByHash(hash)
}
// GetHeaderByNumber retrieves a block header from the database by number,
// caching it (associated with its hash) if found.
func (bc *BlockChain) GetHeaderByNumber(number uint64) *types.Header {
return bc.hc.GetHeaderByNumber(number)
}
// GetHeadersFrom returns a contiguous segment of headers, in rlp-form, going
// backwards from the given number.
func (bc *BlockChain) GetHeadersFrom(number, count uint64) []rlp.RawValue {
return bc.hc.GetHeadersFrom(number, count)
}
// GetBody retrieves a block body (transactions and uncles) from the database by
// hash, caching it if found.
func (bc *BlockChain) GetBody(hash common.Hash) *types.Body {
// Short circuit if the body's already in the cache, retrieve otherwise
if cached, ok := bc.bodyCache.Get(hash); ok {
return cached
}
number := bc.hc.GetBlockNumber(hash)
if number == nil {
return nil
}
body := rawdb.ReadBody(bc.db, hash, *number)
if body == nil {
return nil
}
// Cache the found body for next time and return
bc.bodyCache.Add(hash, body)
return body
}
// GetBodyRLP retrieves a block body in RLP encoding from the database by hash,
// caching it if found.
func (bc *BlockChain) GetBodyRLP(hash common.Hash) rlp.RawValue {
// Short circuit if the body's already in the cache, retrieve otherwise
if cached, ok := bc.bodyRLPCache.Get(hash); ok {
return cached
}
number := bc.hc.GetBlockNumber(hash)
if number == nil {
return nil
}
body := rawdb.ReadBodyRLP(bc.db, hash, *number)
if len(body) == 0 {
return nil
}
// Cache the found body for next time and return
bc.bodyRLPCache.Add(hash, body)
return body
}
// HasBlock checks if a block is fully present in the database or not.
func (bc *BlockChain) HasBlock(hash common.Hash, number uint64) bool {
if bc.blockCache.Contains(hash) {
return true
}
if !bc.HasHeader(hash, number) {
return false
}
return rawdb.HasBody(bc.db, hash, number)
}
// HasFastBlock checks if a fast block is fully present in the database or not.
func (bc *BlockChain) HasFastBlock(hash common.Hash, number uint64) bool {
if !bc.HasBlock(hash, number) {
return false
}
if bc.receiptsCache.Contains(hash) {
return true
}
return rawdb.HasReceipts(bc.db, hash, number)
}
// GetBlock retrieves a block from the database by hash and number,
// caching it if found.
func (bc *BlockChain) GetBlock(hash common.Hash, number uint64) *types.Block {
// Short circuit if the block's already in the cache, retrieve otherwise
if block, ok := bc.blockCache.Get(hash); ok {
return block
}
block := rawdb.ReadBlock(bc.db, hash, number)
if block == nil {
return nil
}
// Cache the found block for next time and return
bc.blockCache.Add(block.Hash(), block)
return block
}
// GetBlockByHash retrieves a block from the database by hash, caching it if found.
func (bc *BlockChain) GetBlockByHash(hash common.Hash) *types.Block {
number := bc.hc.GetBlockNumber(hash)
if number == nil {
return nil
}
return bc.GetBlock(hash, *number)
}
// GetBlockByNumber retrieves a block from the database by number, caching it
// (associated with its hash) if found.
func (bc *BlockChain) GetBlockByNumber(number uint64) *types.Block {
hash := rawdb.ReadCanonicalHash(bc.db, number)
if hash == (common.Hash{}) {
return nil
}
return bc.GetBlock(hash, number)
}
// GetBlocksFromHash returns the block corresponding to hash and up to n-1 ancestors.
// [deprecated by eth/62]
func (bc *BlockChain) GetBlocksFromHash(hash common.Hash, n int) (blocks []*types.Block) {
number := bc.hc.GetBlockNumber(hash)
if number == nil {
return nil
}
for i := 0; i < n; i++ {
block := bc.GetBlock(hash, *number)
if block == nil {
break
}
blocks = append(blocks, block)
hash = block.ParentHash()
*number--
}
return
}
// GetReceiptsByHash retrieves the receipts for all transactions in a given block.
func (bc *BlockChain) GetReceiptsByHash(hash common.Hash) types.Receipts {
if receipts, ok := bc.receiptsCache.Get(hash); ok {
return receipts
}
number := rawdb.ReadHeaderNumber(bc.db, hash)
if number == nil {
return nil
}
header := bc.GetHeader(hash, *number)
if header == nil {
return nil
}
receipts := rawdb.ReadReceipts(bc.db, hash, *number, header.Time, bc.chainConfig)
if receipts == nil {
return nil
}
bc.receiptsCache.Add(hash, receipts)
return receipts
}
// GetSidecarsByHash retrieves the sidecars for all transactions in a given block.
func (bc *BlockChain) GetSidecarsByHash(hash common.Hash) types.BlobSidecars {
if sidecars, ok := bc.sidecarsCache.Get(hash); ok {
return sidecars
}
number := rawdb.ReadHeaderNumber(bc.db, hash)
if number == nil {
return nil
}
sidecars := rawdb.ReadBlobSidecars(bc.db, hash, *number)
if sidecars == nil {
return nil
}
bc.sidecarsCache.Add(hash, sidecars)
return sidecars
}
// GetUnclesInChain retrieves all the uncles from a given block backwards until
// a specific distance is reached.
func (bc *BlockChain) GetUnclesInChain(block *types.Block, length int) []*types.Header {
uncles := []*types.Header{}
for i := 0; block != nil && i < length; i++ {
uncles = append(uncles, block.Uncles()...)
block = bc.GetBlock(block.ParentHash(), block.NumberU64()-1)
}
return uncles
}
// GetCanonicalHash returns the canonical hash for a given block number
func (bc *BlockChain) GetCanonicalHash(number uint64) common.Hash {
return bc.hc.GetCanonicalHash(number)
}
// GetAncestor retrieves the Nth ancestor of a given block. It assumes that either the given block or
// a close ancestor of it is canonical. maxNonCanonical points to a downwards counter limiting the
// number of blocks to be individually checked before we reach the canonical chain.
//
// Note: ancestor == 0 returns the same block, 1 returns its parent and so on.
func (bc *BlockChain) GetAncestor(hash common.Hash, number, ancestor uint64, maxNonCanonical *uint64) (common.Hash, uint64) {
return bc.hc.GetAncestor(hash, number, ancestor, maxNonCanonical)
}
// GetTransactionLookup retrieves the lookup along with the transaction
// itself associate with the given transaction hash.
//
// An error will be returned if the transaction is not found, and background
// indexing for transactions is still in progress. The transaction might be
// reachable shortly once it's indexed.
//
// A null will be returned in the transaction is not found and background
// transaction indexing is already finished. The transaction is not existent
// from the node's perspective.
func (bc *BlockChain) GetTransactionLookup(hash common.Hash) (*rawdb.LegacyTxLookupEntry, *types.Transaction, error) {
bc.txLookupLock.RLock()
defer bc.txLookupLock.RUnlock()
// Short circuit if the txlookup already in the cache, retrieve otherwise
if item, exist := bc.txLookupCache.Get(hash); exist {
return item.lookup, item.transaction, nil
}
tx, blockHash, blockNumber, txIndex := rawdb.ReadTransaction(bc.db, hash)
if tx == nil {
progress, err := bc.TxIndexProgress()
if err != nil {
// No error is returned if the transaction indexing progress is unreachable
// due to unexpected internal errors. In such cases, it is impossible to
// determine whether the transaction does not exist or has simply not been
// indexed yet without a progress marker.
//
// In such scenarios, the transaction is treated as unreachable, though
// this is clearly an unintended and unexpected situation.
return nil, nil, nil
}
// The transaction indexing is not finished yet, returning an
// error to explicitly indicate it.
if !progress.Done() {
return nil, nil, errors.New("transaction indexing still in progress")
}
// The transaction is already indexed, the transaction is either
// not existent or not in the range of index, returning null.
return nil, nil, nil
}
lookup := &rawdb.LegacyTxLookupEntry{
BlockHash: blockHash,
BlockIndex: blockNumber,
Index: txIndex,
}
bc.txLookupCache.Add(hash, txLookup{
lookup: lookup,
transaction: tx,
})
return lookup, tx, nil
}
// GetTd retrieves a block's total difficulty in the canonical chain from the
// database by hash and number, caching it if found.
func (bc *BlockChain) GetTd(hash common.Hash, number uint64) *big.Int {
return bc.hc.GetTd(hash, number)
}
// HasState checks if state trie is fully present in the database or not.
func (bc *BlockChain) HasState(hash common.Hash) bool {
if bc.NoTries() {
if bc.snaps != nil {
return bc.snaps.Snapshot(hash) != nil
}
// snaps is nil when the blockchain creates
found, err := snapshot.PreCheckSnapshot(bc.db, hash)
if err != nil {
log.Warn("Check HasState in NoTries mode failed", "root", hash, "err", err)
return false
}
return found
}
_, err := bc.statedb.OpenTrie(hash)
return err == nil
}
// HasBlockAndState checks if a block and associated state trie is fully present
// in the database or not, caching it if present.
func (bc *BlockChain) HasBlockAndState(hash common.Hash, number uint64) bool {
// Check first that the block itself is known
block := bc.GetBlock(hash, number)
if block == nil {
return false
}
return bc.HasState(block.Root())
}
// stateRecoverable checks if the specified state is recoverable.
// Note, this function assumes the state is not present, because
// state is not treated as recoverable if it's available, thus
// false will be returned in this case.
func (bc *BlockChain) stateRecoverable(root common.Hash) bool {
if bc.triedb.Scheme() == rawdb.HashScheme {
return false
}
result, _ := bc.triedb.Recoverable(root)
return result
}
// ContractCodeWithPrefix retrieves a blob of data associated with a contract
// hash either from ephemeral in-memory cache, or from persistent storage.
func (bc *BlockChain) ContractCodeWithPrefix(hash common.Hash) []byte {
// TODO(rjl493456442) The associated account address is also required
// in Verkle scheme. Fix it once snap-sync is supported for Verkle.
return bc.statedb.ContractCodeWithPrefix(common.Address{}, hash)
}
// State returns a new mutable state based on the current HEAD block.
func (bc *BlockChain) State() (*state.StateDB, error) {
return bc.StateAt(bc.CurrentBlock().Root)
}
// StateAt returns a new mutable state based on a particular point in time.
func (bc *BlockChain) StateAt(root common.Hash) (*state.StateDB, error) {
stateDb, err := state.New(root, bc.statedb)
if err != nil {
return nil, err
}
// If there's no trie and the specified snapshot is not available, getting
// any state will by default return nil.
// Instead of that, it will be more useful to return an error to indicate
// the state is not available.
if stateDb.NoTrie() && stateDb.GetSnap() == nil {
return nil, errors.New("state is not available")
}
return stateDb, err
}
// Config retrieves the chain's fork configuration.
func (bc *BlockChain) Config() *params.ChainConfig { return bc.chainConfig }
// Engine retrieves the blockchain's consensus engine.
func (bc *BlockChain) Engine() consensus.Engine { return bc.engine }
// Snapshots returns the blockchain snapshot tree.
func (bc *BlockChain) Snapshots() *snapshot.Tree {
return bc.snaps
}
// Validator returns the current validator.
func (bc *BlockChain) Validator() Validator {
return bc.validator
}
// Processor returns the current processor.
func (bc *BlockChain) Processor() Processor {
return bc.processor
}
// StateCache returns the caching database underpinning the blockchain instance.
func (bc *BlockChain) StateCache() state.Database {
return bc.statedb
}
// GasLimit returns the gas limit of the current HEAD block.
func (bc *BlockChain) GasLimit() uint64 {
return bc.CurrentBlock().GasLimit
}
// Genesis retrieves the chain's genesis block.
func (bc *BlockChain) Genesis() *types.Block {
return bc.genesisBlock
}
// GenesisHeader retrieves the chain's genesis block header.
func (bc *BlockChain) GenesisHeader() *types.Header {
return bc.genesisBlock.Header()
}
// TxIndexProgress returns the transaction indexing progress.
func (bc *BlockChain) TxIndexProgress() (TxIndexProgress, error) {
if bc.txIndexer == nil {
return TxIndexProgress{}, errors.New("tx indexer is not enabled")
}
return bc.txIndexer.txIndexProgress()
}
// TrieDB retrieves the low level trie database used for data storage.
func (bc *BlockChain) TrieDB() *triedb.Database {
return bc.triedb
}
// HeaderChain returns the underlying header chain.
func (bc *BlockChain) HeaderChain() *HeaderChain {
return bc.hc
}
// SubscribeRemovedLogsEvent registers a subscription of RemovedLogsEvent.
func (bc *BlockChain) SubscribeRemovedLogsEvent(ch chan<- RemovedLogsEvent) event.Subscription {
return bc.scope.Track(bc.rmLogsFeed.Subscribe(ch))
}
// SubscribeChainEvent registers a subscription of ChainEvent.
func (bc *BlockChain) SubscribeChainEvent(ch chan<- ChainEvent) event.Subscription {
return bc.scope.Track(bc.chainFeed.Subscribe(ch))
}
// SubscribeChainHeadEvent registers a subscription of ChainHeadEvent.
func (bc *BlockChain) SubscribeChainHeadEvent(ch chan<- ChainHeadEvent) event.Subscription {
return bc.scope.Track(bc.chainHeadFeed.Subscribe(ch))
}
// SubscribeHighestVerifiedHeaderEvent registers a subscription of HighestVerifiedBlockEvent.
func (bc *BlockChain) SubscribeHighestVerifiedHeaderEvent(ch chan<- HighestVerifiedBlockEvent) event.Subscription {
return bc.scope.Track(bc.highestVerifiedBlockFeed.Subscribe(ch))
}
// SubscribeChainBlockEvent registers a subscription of ChainBlockEvent.
func (bc *BlockChain) SubscribeChainBlockEvent(ch chan<- ChainHeadEvent) event.Subscription {
return bc.scope.Track(bc.chainBlockFeed.Subscribe(ch))
}
// SubscribeLogsEvent registers a subscription of []*types.Log.
func (bc *BlockChain) SubscribeLogsEvent(ch chan<- []*types.Log) event.Subscription {
return bc.scope.Track(bc.logsFeed.Subscribe(ch))
}
// SubscribeBlockProcessingEvent registers a subscription of bool where true means
// block processing has started while false means it has stopped.
func (bc *BlockChain) SubscribeBlockProcessingEvent(ch chan<- bool) event.Subscription {
return bc.scope.Track(bc.blockProcFeed.Subscribe(ch))
}
// SubscribeFinalizedHeaderEvent registers a subscription of FinalizedHeaderEvent.
func (bc *BlockChain) SubscribeFinalizedHeaderEvent(ch chan<- FinalizedHeaderEvent) event.Subscription {
return bc.scope.Track(bc.finalizedHeaderFeed.Subscribe(ch))
}
// AncientTail retrieves the tail the ancients blocks
func (bc *BlockChain) AncientTail() (uint64, error) {
tail, err := bc.db.BlockStore().Tail()
if err != nil {
return 0, err
}
return tail, nil
}
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