state_test_util.go

// (c) 2019-2020, Ava Labs, Inc.
//
// This file is a derived work, based on the go-ethereum library whose original
// notices appear below.
//
// It is distributed under a license compatible with the licensing terms of the
// original code from which it is derived.
//
// Much love to the original authors for their work.
// **********
// Copyright 2015 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 tests

import (
	"encoding/hex"
	"encoding/json"
	"fmt"
	"math/big"
	"strconv"
	"strings"

	"github.com/lasthyphen/subnet-evm/core"
	"github.com/lasthyphen/subnet-evm/core/state"
	"github.com/lasthyphen/subnet-evm/core/state/snapshot"
	"github.com/lasthyphen/subnet-evm/core/types"
	"github.com/lasthyphen/subnet-evm/core/vm"
	"github.com/lasthyphen/subnet-evm/ethdb"
	"github.com/lasthyphen/subnet-evm/params"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/common/hexutil"
	"github.com/ethereum/go-ethereum/common/math"
	"github.com/ethereum/go-ethereum/crypto"
)

// StateTest checks transaction processing without block context.
// See https://github.com/ethereum/EIPs/issues/176 for the test format specification.
type StateTest struct {
	json stJSON
}

// StateSubtest selects a specific configuration of a General State Test.
type StateSubtest struct {
	Fork  string
	Index int
}

func (t *StateTest) UnmarshalJSON(in []byte) error {
	return json.Unmarshal(in, &t.json)
}

type stJSON struct {
	Env  stEnv                    `json:"env"`
	Pre  core.GenesisAlloc        `json:"pre"`
	Tx   stTransaction            `json:"transaction"`
	Out  hexutil.Bytes            `json:"out"`
	Post map[string][]stPostState `json:"post"`
}

type stPostState struct {
	Root            common.UnprefixedHash `json:"hash"`
	Logs            common.UnprefixedHash `json:"logs"`
	TxBytes         hexutil.Bytes         `json:"txbytes"`
	ExpectException string                `json:"expectException"`
	Indexes         struct {
		Data  int `json:"data"`
		Gas   int `json:"gas"`
		Value int `json:"value"`
	}
}

//go:generate go run github.com/fjl/gencodec -type stEnv -field-override stEnvMarshaling -out gen_stenv.go
type stEnv struct {
	Coinbase   common.Address `json:"currentCoinbase"   gencodec:"required"`
	Difficulty *big.Int       `json:"currentDifficulty" gencodec:"required"`
	GasLimit   uint64         `json:"currentGasLimit"   gencodec:"required"`
	Number     uint64         `json:"currentNumber"     gencodec:"required"`
	Timestamp  uint64         `json:"currentTimestamp"  gencodec:"required"`
	BaseFee    *big.Int       `json:"currentBaseFee"  gencodec:"optional"`
}

//go:generate go run github.com/fjl/gencodec -type stTransaction -field-override stTransactionMarshaling -out gen_sttransaction.go
type stTransaction struct {
	GasPrice             *big.Int            `json:"gasPrice"`
	MaxFeePerGas         *big.Int            `json:"maxFeePerGas"`
	MaxPriorityFeePerGas *big.Int            `json:"maxPriorityFeePerGas"`
	Nonce                uint64              `json:"nonce"`
	To                   string              `json:"to"`
	Data                 []string            `json:"data"`
	AccessLists          []*types.AccessList `json:"accessLists,omitempty"`
	GasLimit             []uint64            `json:"gasLimit"`
	Value                []string            `json:"value"`
	PrivateKey           []byte              `json:"secretKey"`
}

// GetChainConfig takes a fork definition and returns a chain config.
// The fork definition can be
// - a plain forkname, e.g. `Byzantium`,
// - a fork basename, and a list of EIPs to enable; e.g. `Byzantium+1884+1283`.
func GetChainConfig(forkString string) (baseConfig *params.ChainConfig, eips []int, err error) {
	var (
		splitForks            = strings.Split(forkString, "+")
		ok                    bool
		baseName, eipsStrings = splitForks[0], splitForks[1:]
	)
	if baseConfig, ok = Forks[baseName]; !ok {
		return nil, nil, UnsupportedForkError{baseName}
	}
	for _, eip := range eipsStrings {
		if eipNum, err := strconv.Atoi(eip); err != nil {
			return nil, nil, fmt.Errorf("syntax error, invalid eip number %v", eipNum)
		} else {
			if !vm.ValidEip(eipNum) {
				return nil, nil, fmt.Errorf("syntax error, invalid eip number %v", eipNum)
			}
			eips = append(eips, eipNum)
		}
	}
	return baseConfig, eips, nil
}

// Subtests returns all valid subtests of the test.
func (t *StateTest) Subtests() []StateSubtest {
	var sub []StateSubtest
	for fork, pss := range t.json.Post {
		for i := range pss {
			sub = append(sub, StateSubtest{fork, i})
		}
	}
	return sub
}

func (t *StateTest) gasLimit(subtest StateSubtest) uint64 {
	return t.json.Tx.GasLimit[t.json.Post[subtest.Fork][subtest.Index].Indexes.Gas]
}

func MakePreState(db ethdb.Database, accounts core.GenesisAlloc, snapshotter bool) (*snapshot.Tree, *state.StateDB) {
	sdb := state.NewDatabase(db)
	statedb, _ := state.New(common.Hash{}, sdb, nil)
	for addr, a := range accounts {
		statedb.SetCode(addr, a.Code)
		statedb.SetNonce(addr, a.Nonce)
		statedb.SetBalance(addr, a.Balance)
		for k, v := range a.Storage {
			statedb.SetState(addr, k, v)
		}
	}
	// Commit and re-open to start with a clean state.
	root, _ := statedb.Commit(false, false)

	var snaps *snapshot.Tree
	if snapshotter {
		snaps, _ = snapshot.New(db, sdb.TrieDB(), 1, common.Hash{}, root, false, true, false)
	}
	statedb, _ = state.New(root, sdb, snaps)
	return snaps, statedb
}

func (t *StateTest) genesis(config *params.ChainConfig) *core.Genesis {
	return &core.Genesis{
		Config:     config,
		Coinbase:   t.json.Env.Coinbase,
		Difficulty: t.json.Env.Difficulty,
		GasLimit:   t.json.Env.GasLimit,
		Number:     t.json.Env.Number,
		Timestamp:  t.json.Env.Timestamp,
		Alloc:      t.json.Pre,
	}
}

func (tx *stTransaction) toMessage(ps stPostState, baseFee *big.Int) (core.Message, error) {
	// Derive sender from private key if present.
	var from common.Address
	if len(tx.PrivateKey) > 0 {
		key, err := crypto.ToECDSA(tx.PrivateKey)
		if err != nil {
			return nil, fmt.Errorf("invalid private key: %v", err)
		}
		from = crypto.PubkeyToAddress(key.PublicKey)
	}
	// Parse recipient if present.
	var to *common.Address
	if tx.To != "" {
		to = new(common.Address)
		if err := to.UnmarshalText([]byte(tx.To)); err != nil {
			return nil, fmt.Errorf("invalid to address: %v", err)
		}
	}

	// Get values specific to this post state.
	if ps.Indexes.Data > len(tx.Data) {
		return nil, fmt.Errorf("tx data index %d out of bounds", ps.Indexes.Data)
	}
	if ps.Indexes.Value > len(tx.Value) {
		return nil, fmt.Errorf("tx value index %d out of bounds", ps.Indexes.Value)
	}
	if ps.Indexes.Gas > len(tx.GasLimit) {
		return nil, fmt.Errorf("tx gas limit index %d out of bounds", ps.Indexes.Gas)
	}
	dataHex := tx.Data[ps.Indexes.Data]
	valueHex := tx.Value[ps.Indexes.Value]
	gasLimit := tx.GasLimit[ps.Indexes.Gas]
	// Value, Data hex encoding is messy: https://github.com/ethereum/tests/issues/203
	value := new(big.Int)
	if valueHex != "0x" {
		v, ok := math.ParseBig256(valueHex)
		if !ok {
			return nil, fmt.Errorf("invalid tx value %q", valueHex)
		}
		value = v
	}
	data, err := hex.DecodeString(strings.TrimPrefix(dataHex, "0x"))
	if err != nil {
		return nil, fmt.Errorf("invalid tx data %q", dataHex)
	}
	var accessList types.AccessList
	if tx.AccessLists != nil && tx.AccessLists[ps.Indexes.Data] != nil {
		accessList = *tx.AccessLists[ps.Indexes.Data]
	}
	// If baseFee provided, set gasPrice to effectiveGasPrice.
	gasPrice := tx.GasPrice
	if baseFee != nil {
		if tx.MaxFeePerGas == nil {
			tx.MaxFeePerGas = gasPrice
		}
		if tx.MaxFeePerGas == nil {
			tx.MaxFeePerGas = new(big.Int)
		}
		if tx.MaxPriorityFeePerGas == nil {
			tx.MaxPriorityFeePerGas = tx.MaxFeePerGas
		}
		gasPrice = math.BigMin(new(big.Int).Add(tx.MaxPriorityFeePerGas, baseFee),
			tx.MaxFeePerGas)
	}
	if gasPrice == nil {
		return nil, fmt.Errorf("no gas price provided")
	}

	msg := types.NewMessage(from, to, tx.Nonce, value, gasLimit, gasPrice,
		tx.MaxFeePerGas, tx.MaxPriorityFeePerGas, data, accessList, false)
	return msg, nil
}