mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
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f53ff0ff4a
This ensures that RPC method handlers will react to a timeout or cancelled request soon after the event occurs. Co-authored-by: Sina Mahmoodi <itz.s1na@gmail.com>
233 lines
10 KiB
Go
233 lines
10 KiB
Go
// Copyright 2021 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package eth
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import (
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"context"
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"errors"
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"fmt"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/core/state"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/core/vm"
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"github.com/ethereum/go-ethereum/eth/tracers"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/trie"
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)
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// noopReleaser is returned in case there is no operation expected
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// for releasing state.
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var noopReleaser = tracers.StateReleaseFunc(func() {})
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// StateAtBlock retrieves the state database associated with a certain block.
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// If no state is locally available for the given block, a number of blocks
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// are attempted to be reexecuted to generate the desired state. The optional
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// base layer statedb can be provided which is regarded as the statedb of the
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// parent block.
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//
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// An additional release function will be returned if the requested state is
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// available. Release is expected to be invoked when the returned state is no longer needed.
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// Its purpose is to prevent resource leaking. Though it can be noop in some cases.
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//
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// Parameters:
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// - block: The block for which we want the state(state = block.Root)
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// - reexec: The maximum number of blocks to reprocess trying to obtain the desired state
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// - base: If the caller is tracing multiple blocks, the caller can provide the parent
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// state continuously from the callsite.
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// - readOnly: If true, then the live 'blockchain' state database is used. No mutation should
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// be made from caller, e.g. perform Commit or other 'save-to-disk' changes.
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// Otherwise, the trash generated by caller may be persisted permanently.
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// - preferDisk: this arg can be used by the caller to signal that even though the 'base' is
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// provided, it would be preferable to start from a fresh state, if we have it
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// on disk.
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func (eth *Ethereum) StateAtBlock(ctx context.Context, block *types.Block, reexec uint64, base *state.StateDB, readOnly bool, preferDisk bool) (statedb *state.StateDB, release tracers.StateReleaseFunc, err error) {
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var (
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current *types.Block
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database state.Database
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report = true
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origin = block.NumberU64()
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)
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// The state is only for reading purposes, check the state presence in
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// live database.
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if readOnly {
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// The state is available in live database, create a reference
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// on top to prevent garbage collection and return a release
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// function to deref it.
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if statedb, err = eth.blockchain.StateAt(block.Root()); err == nil {
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statedb.Database().TrieDB().Reference(block.Root(), common.Hash{})
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return statedb, func() {
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statedb.Database().TrieDB().Dereference(block.Root())
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}, nil
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}
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}
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// The state is both for reading and writing, or it's unavailable in disk,
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// try to construct/recover the state over an ephemeral trie.Database for
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// isolating the live one.
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if base != nil {
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if preferDisk {
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// Create an ephemeral trie.Database for isolating the live one. Otherwise
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// the internal junks created by tracing will be persisted into the disk.
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database = state.NewDatabaseWithConfig(eth.chainDb, &trie.Config{Cache: 16})
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if statedb, err = state.New(block.Root(), database, nil); err == nil {
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log.Info("Found disk backend for state trie", "root", block.Root(), "number", block.Number())
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return statedb, noopReleaser, nil
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}
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}
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// The optional base statedb is given, mark the start point as parent block
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statedb, database, report = base, base.Database(), false
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current = eth.blockchain.GetBlock(block.ParentHash(), block.NumberU64()-1)
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} else {
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// Otherwise, try to reexec blocks until we find a state or reach our limit
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current = block
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// Create an ephemeral trie.Database for isolating the live one. Otherwise
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// the internal junks created by tracing will be persisted into the disk.
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database = state.NewDatabaseWithConfig(eth.chainDb, &trie.Config{Cache: 16})
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// If we didn't check the live database, do check state over ephemeral database,
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// otherwise we would rewind past a persisted block (specific corner case is
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// chain tracing from the genesis).
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if !readOnly {
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statedb, err = state.New(current.Root(), database, nil)
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if err == nil {
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return statedb, noopReleaser, nil
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}
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}
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// Database does not have the state for the given block, try to regenerate
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for i := uint64(0); i < reexec; i++ {
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if err := ctx.Err(); err != nil {
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return nil, nil, err
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}
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if current.NumberU64() == 0 {
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return nil, nil, errors.New("genesis state is missing")
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}
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parent := eth.blockchain.GetBlock(current.ParentHash(), current.NumberU64()-1)
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if parent == nil {
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return nil, nil, fmt.Errorf("missing block %v %d", current.ParentHash(), current.NumberU64()-1)
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}
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current = parent
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statedb, err = state.New(current.Root(), database, nil)
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if err == nil {
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break
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}
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}
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if err != nil {
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switch err.(type) {
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case *trie.MissingNodeError:
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return nil, nil, fmt.Errorf("required historical state unavailable (reexec=%d)", reexec)
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default:
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return nil, nil, err
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}
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}
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}
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// State is available at historical point, re-execute the blocks on top for
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// the desired state.
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var (
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start = time.Now()
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logged time.Time
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parent common.Hash
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)
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for current.NumberU64() < origin {
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if err := ctx.Err(); err != nil {
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return nil, nil, err
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}
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// Print progress logs if long enough time elapsed
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if time.Since(logged) > 8*time.Second && report {
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log.Info("Regenerating historical state", "block", current.NumberU64()+1, "target", origin, "remaining", origin-current.NumberU64()-1, "elapsed", time.Since(start))
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logged = time.Now()
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}
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// Retrieve the next block to regenerate and process it
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next := current.NumberU64() + 1
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if current = eth.blockchain.GetBlockByNumber(next); current == nil {
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return nil, nil, fmt.Errorf("block #%d not found", next)
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}
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_, _, _, err := eth.blockchain.Processor().Process(current, statedb, vm.Config{})
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if err != nil {
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return nil, nil, fmt.Errorf("processing block %d failed: %v", current.NumberU64(), err)
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}
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// Finalize the state so any modifications are written to the trie
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root, err := statedb.Commit(eth.blockchain.Config().IsEIP158(current.Number()))
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if err != nil {
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return nil, nil, fmt.Errorf("stateAtBlock commit failed, number %d root %v: %w",
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current.NumberU64(), current.Root().Hex(), err)
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}
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statedb, err = state.New(root, database, nil)
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if err != nil {
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return nil, nil, fmt.Errorf("state reset after block %d failed: %v", current.NumberU64(), err)
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}
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// Hold the state reference and also drop the parent state
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// to prevent accumulating too many nodes in memory.
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database.TrieDB().Reference(root, common.Hash{})
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if parent != (common.Hash{}) {
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database.TrieDB().Dereference(parent)
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}
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parent = root
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}
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if report {
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nodes, imgs := database.TrieDB().Size()
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log.Info("Historical state regenerated", "block", current.NumberU64(), "elapsed", time.Since(start), "nodes", nodes, "preimages", imgs)
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}
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return statedb, func() { database.TrieDB().Dereference(block.Root()) }, nil
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}
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// stateAtTransaction returns the execution environment of a certain transaction.
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func (eth *Ethereum) stateAtTransaction(ctx context.Context, block *types.Block, txIndex int, reexec uint64) (core.Message, vm.BlockContext, *state.StateDB, tracers.StateReleaseFunc, error) {
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// Short circuit if it's genesis block.
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if block.NumberU64() == 0 {
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return nil, vm.BlockContext{}, nil, nil, errors.New("no transaction in genesis")
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}
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// Create the parent state database
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parent := eth.blockchain.GetBlock(block.ParentHash(), block.NumberU64()-1)
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if parent == nil {
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return nil, vm.BlockContext{}, nil, nil, fmt.Errorf("parent %#x not found", block.ParentHash())
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}
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// Lookup the statedb of parent block from the live database,
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// otherwise regenerate it on the flight.
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statedb, release, err := eth.StateAtBlock(ctx, parent, reexec, nil, true, false)
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if err != nil {
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return nil, vm.BlockContext{}, nil, nil, err
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}
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if txIndex == 0 && len(block.Transactions()) == 0 {
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return nil, vm.BlockContext{}, statedb, release, nil
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}
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// Recompute transactions up to the target index.
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signer := types.MakeSigner(eth.blockchain.Config(), block.Number())
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for idx, tx := range block.Transactions() {
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// Assemble the transaction call message and return if the requested offset
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msg, _ := tx.AsMessage(signer, block.BaseFee())
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txContext := core.NewEVMTxContext(msg)
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context := core.NewEVMBlockContext(block.Header(), eth.blockchain, nil)
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if idx == txIndex {
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return msg, context, statedb, release, nil
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}
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// Not yet the searched for transaction, execute on top of the current state
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vmenv := vm.NewEVM(context, txContext, statedb, eth.blockchain.Config(), vm.Config{})
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statedb.SetTxContext(tx.Hash(), idx)
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if _, err := core.ApplyMessage(vmenv, msg, new(core.GasPool).AddGas(tx.Gas())); err != nil {
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return nil, vm.BlockContext{}, nil, nil, fmt.Errorf("transaction %#x failed: %v", tx.Hash(), err)
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}
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// Ensure any modifications are committed to the state
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// Only delete empty objects if EIP158/161 (a.k.a Spurious Dragon) is in effect
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statedb.Finalise(vmenv.ChainConfig().IsEIP158(block.Number()))
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}
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return nil, vm.BlockContext{}, nil, nil, fmt.Errorf("transaction index %d out of range for block %#x", txIndex, block.Hash())
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}
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