mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
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67ac5f0ae7
Here, the core.Message interface turns into a plain struct and types.Message gets removed. This is a breaking change to packages core and core/types. While we do not promise API stability for package core, we do for core/types. An exception can be made for types.Message, since it doesn't have any purpose apart from invoking the state transition in package core. types.Message was also marked deprecated by the same commit it got added in,4dca5d4db7
(November 2016). The core.Message interface was added in December 2014, in commitdb494170dc
, for the purpose of 'testing' state transitions. It's the same change that made transaction struct fields private. Before that, the state transition used *types.Transaction directly. Over time, multiple implementations of the interface accrued across different packages, since constructing a Message is required whenever one wants to invoke the state transition. These implementations all looked very similar, a struct with private fields exposing the fields as accessor methods. By changing Message into a struct with public fields we can remove all these useless interface implementations. It will also hopefully simplify future changes to the type with less updates to apply across all of go-ethereum when a field is added to Message. --------- Co-authored-by: Felix Lange <fjl@twurst.com>
130 lines
4.3 KiB
Go
130 lines
4.3 KiB
Go
// Copyright 2016 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 core
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import (
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/consensus"
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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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)
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// ChainContext supports retrieving headers and consensus parameters from the
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// current blockchain to be used during transaction processing.
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type ChainContext interface {
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// Engine retrieves the chain's consensus engine.
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Engine() consensus.Engine
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// GetHeader returns the header corresponding to the hash/number argument pair.
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GetHeader(common.Hash, uint64) *types.Header
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}
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// NewEVMBlockContext creates a new context for use in the EVM.
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func NewEVMBlockContext(header *types.Header, chain ChainContext, author *common.Address) vm.BlockContext {
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var (
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beneficiary common.Address
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baseFee *big.Int
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random *common.Hash
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)
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// If we don't have an explicit author (i.e. not mining), extract from the header
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if author == nil {
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beneficiary, _ = chain.Engine().Author(header) // Ignore error, we're past header validation
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} else {
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beneficiary = *author
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}
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if header.BaseFee != nil {
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baseFee = new(big.Int).Set(header.BaseFee)
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}
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if header.Difficulty.Cmp(common.Big0) == 0 {
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random = &header.MixDigest
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}
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return vm.BlockContext{
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CanTransfer: CanTransfer,
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Transfer: Transfer,
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GetHash: GetHashFn(header, chain),
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Coinbase: beneficiary,
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BlockNumber: new(big.Int).Set(header.Number),
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Time: header.Time,
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Difficulty: new(big.Int).Set(header.Difficulty),
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BaseFee: baseFee,
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GasLimit: header.GasLimit,
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Random: random,
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}
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}
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// NewEVMTxContext creates a new transaction context for a single transaction.
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func NewEVMTxContext(msg *Message) vm.TxContext {
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return vm.TxContext{
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Origin: msg.From,
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GasPrice: new(big.Int).Set(msg.GasPrice),
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}
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}
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// GetHashFn returns a GetHashFunc which retrieves header hashes by number
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func GetHashFn(ref *types.Header, chain ChainContext) func(n uint64) common.Hash {
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// Cache will initially contain [refHash.parent],
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// Then fill up with [refHash.p, refHash.pp, refHash.ppp, ...]
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var cache []common.Hash
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return func(n uint64) common.Hash {
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if ref.Number.Uint64() <= n {
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// This situation can happen if we're doing tracing and using
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// block overrides.
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return common.Hash{}
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}
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// If there's no hash cache yet, make one
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if len(cache) == 0 {
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cache = append(cache, ref.ParentHash)
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}
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if idx := ref.Number.Uint64() - n - 1; idx < uint64(len(cache)) {
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return cache[idx]
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}
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// No luck in the cache, but we can start iterating from the last element we already know
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lastKnownHash := cache[len(cache)-1]
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lastKnownNumber := ref.Number.Uint64() - uint64(len(cache))
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for {
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header := chain.GetHeader(lastKnownHash, lastKnownNumber)
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if header == nil {
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break
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}
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cache = append(cache, header.ParentHash)
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lastKnownHash = header.ParentHash
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lastKnownNumber = header.Number.Uint64() - 1
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if n == lastKnownNumber {
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return lastKnownHash
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}
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}
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return common.Hash{}
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}
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}
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// CanTransfer checks whether there are enough funds in the address' account to make a transfer.
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// This does not take the necessary gas in to account to make the transfer valid.
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func CanTransfer(db vm.StateDB, addr common.Address, amount *big.Int) bool {
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return db.GetBalance(addr).Cmp(amount) >= 0
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}
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// Transfer subtracts amount from sender and adds amount to recipient using the given Db
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func Transfer(db vm.StateDB, sender, recipient common.Address, amount *big.Int) {
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db.SubBalance(sender, amount)
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db.AddBalance(recipient, amount)
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}
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