Official Go implementation of the Ethereum protocol
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go-ethereum/eth/tracers/api_test.go

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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 tracers
import (
"bytes"
"context"
"crypto/ecdsa"
"encoding/json"
"errors"
"fmt"
"math/big"
"reflect"
"sort"
"testing"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/consensus"
"github.com/ethereum/go-ethereum/consensus/ethash"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/eth/tracers/logger"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/internal/ethapi"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rpc"
)
var (
errStateNotFound = errors.New("state not found")
errBlockNotFound = errors.New("block not found")
errTransactionNotFound = errors.New("transaction not found")
)
type testBackend struct {
chainConfig *params.ChainConfig
engine consensus.Engine
chaindb ethdb.Database
chain *core.BlockChain
}
func newTestBackend(t *testing.T, n int, gspec *core.Genesis, generator func(i int, b *core.BlockGen)) *testBackend {
backend := &testBackend{
chainConfig: params.TestChainConfig,
engine: ethash.NewFaker(),
chaindb: rawdb.NewMemoryDatabase(),
}
// Generate blocks for testing
gspec.Config = backend.chainConfig
var (
gendb = rawdb.NewMemoryDatabase()
genesis = gspec.MustCommit(gendb)
)
blocks, _ := core.GenerateChain(backend.chainConfig, genesis, backend.engine, gendb, n, generator)
// Import the canonical chain
gspec.MustCommit(backend.chaindb)
cacheConfig := &core.CacheConfig{
TrieCleanLimit: 256,
TrieDirtyLimit: 256,
TrieTimeLimit: 5 * time.Minute,
SnapshotLimit: 0,
TrieDirtyDisabled: true, // Archive mode
}
chain, err := core.NewBlockChain(backend.chaindb, cacheConfig, backend.chainConfig, backend.engine, vm.Config{}, nil, nil)
if err != nil {
t.Fatalf("failed to create tester chain: %v", err)
}
if n, err := chain.InsertChain(blocks); err != nil {
t.Fatalf("block %d: failed to insert into chain: %v", n, err)
}
backend.chain = chain
return backend
}
func (b *testBackend) HeaderByHash(ctx context.Context, hash common.Hash) (*types.Header, error) {
return b.chain.GetHeaderByHash(hash), nil
}
func (b *testBackend) HeaderByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Header, error) {
if number == rpc.PendingBlockNumber || number == rpc.LatestBlockNumber {
return b.chain.CurrentHeader(), nil
}
return b.chain.GetHeaderByNumber(uint64(number)), nil
}
func (b *testBackend) BlockByHash(ctx context.Context, hash common.Hash) (*types.Block, error) {
return b.chain.GetBlockByHash(hash), nil
}
func (b *testBackend) BlockByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Block, error) {
if number == rpc.PendingBlockNumber || number == rpc.LatestBlockNumber {
return b.chain.CurrentBlock(), nil
}
return b.chain.GetBlockByNumber(uint64(number)), nil
}
func (b *testBackend) GetTransaction(ctx context.Context, txHash common.Hash) (*types.Transaction, common.Hash, uint64, uint64, error) {
tx, hash, blockNumber, index := rawdb.ReadTransaction(b.chaindb, txHash)
if tx == nil {
return nil, common.Hash{}, 0, 0, errTransactionNotFound
}
return tx, hash, blockNumber, index, nil
}
func (b *testBackend) RPCGasCap() uint64 {
return 25000000
}
func (b *testBackend) ChainConfig() *params.ChainConfig {
return b.chainConfig
}
func (b *testBackend) Engine() consensus.Engine {
return b.engine
}
func (b *testBackend) ChainDb() ethdb.Database {
return b.chaindb
}
func (b *testBackend) StateAtBlock(ctx context.Context, block *types.Block, reexec uint64, base *state.StateDB, checkLive bool, preferDisk bool) (*state.StateDB, error) {
statedb, err := b.chain.StateAt(block.Root())
if err != nil {
return nil, errStateNotFound
}
return statedb, nil
}
func (b *testBackend) StateAtTransaction(ctx context.Context, block *types.Block, txIndex int, reexec uint64) (core.Message, vm.BlockContext, *state.StateDB, error) {
parent := b.chain.GetBlock(block.ParentHash(), block.NumberU64()-1)
if parent == nil {
return nil, vm.BlockContext{}, nil, errBlockNotFound
}
statedb, err := b.chain.StateAt(parent.Root())
if err != nil {
return nil, vm.BlockContext{}, nil, errStateNotFound
}
if txIndex == 0 && len(block.Transactions()) == 0 {
return nil, vm.BlockContext{}, statedb, nil
}
// Recompute transactions up to the target index.
signer := types.MakeSigner(b.chainConfig, block.Number())
for idx, tx := range block.Transactions() {
msg, _ := tx.AsMessage(signer, block.BaseFee())
txContext := core.NewEVMTxContext(msg)
context := core.NewEVMBlockContext(block.Header(), b.chain, nil)
if idx == txIndex {
return msg, context, statedb, nil
}
vmenv := vm.NewEVM(context, txContext, statedb, b.chainConfig, vm.Config{})
if _, err := core.ApplyMessage(vmenv, msg, new(core.GasPool).AddGas(tx.Gas())); err != nil {
return nil, vm.BlockContext{}, nil, fmt.Errorf("transaction %#x failed: %v", tx.Hash(), err)
}
statedb.Finalise(vmenv.ChainConfig().IsEIP158(block.Number()))
}
return nil, vm.BlockContext{}, nil, fmt.Errorf("transaction index %d out of range for block %#x", txIndex, block.Hash())
}
func TestTraceCall(t *testing.T) {
t.Parallel()
// Initialize test accounts
accounts := newAccounts(3)
genesis := &core.Genesis{Alloc: core.GenesisAlloc{
accounts[0].addr: {Balance: big.NewInt(params.Ether)},
accounts[1].addr: {Balance: big.NewInt(params.Ether)},
accounts[2].addr: {Balance: big.NewInt(params.Ether)},
}}
genBlocks := 10
signer := types.HomesteadSigner{}
api := NewAPI(newTestBackend(t, genBlocks, genesis, func(i int, b *core.BlockGen) {
// Transfer from account[0] to account[1]
// value: 1000 wei
// fee: 0 wei
tx, _ := types.SignTx(types.NewTransaction(uint64(i), accounts[1].addr, big.NewInt(1000), params.TxGas, b.BaseFee(), nil), signer, accounts[0].key)
b.AddTx(tx)
}))
var testSuite = []struct {
blockNumber rpc.BlockNumber
call ethapi.TransactionArgs
config *TraceCallConfig
expectErr error
expect interface{}
}{
// Standard JSON trace upon the genesis, plain transfer.
{
blockNumber: rpc.BlockNumber(0),
call: ethapi.TransactionArgs{
From: &accounts[0].addr,
To: &accounts[1].addr,
Value: (*hexutil.Big)(big.NewInt(1000)),
},
config: nil,
expectErr: nil,
expect: &logger.ExecutionResult{
Gas: params.TxGas,
Failed: false,
ReturnValue: "",
StructLogs: []logger.StructLogRes{},
},
},
// Standard JSON trace upon the head, plain transfer.
{
blockNumber: rpc.BlockNumber(genBlocks),
call: ethapi.TransactionArgs{
From: &accounts[0].addr,
To: &accounts[1].addr,
Value: (*hexutil.Big)(big.NewInt(1000)),
},
config: nil,
expectErr: nil,
expect: &logger.ExecutionResult{
Gas: params.TxGas,
Failed: false,
ReturnValue: "",
StructLogs: []logger.StructLogRes{},
},
},
// Standard JSON trace upon the non-existent block, error expects
{
blockNumber: rpc.BlockNumber(genBlocks + 1),
call: ethapi.TransactionArgs{
From: &accounts[0].addr,
To: &accounts[1].addr,
Value: (*hexutil.Big)(big.NewInt(1000)),
},
config: nil,
expectErr: fmt.Errorf("block #%d not found", genBlocks+1),
expect: nil,
},
// Standard JSON trace upon the latest block
{
blockNumber: rpc.LatestBlockNumber,
call: ethapi.TransactionArgs{
From: &accounts[0].addr,
To: &accounts[1].addr,
Value: (*hexutil.Big)(big.NewInt(1000)),
},
config: nil,
expectErr: nil,
expect: &logger.ExecutionResult{
Gas: params.TxGas,
Failed: false,
ReturnValue: "",
StructLogs: []logger.StructLogRes{},
},
},
// Standard JSON trace upon the pending block
{
blockNumber: rpc.PendingBlockNumber,
call: ethapi.TransactionArgs{
From: &accounts[0].addr,
To: &accounts[1].addr,
Value: (*hexutil.Big)(big.NewInt(1000)),
},
config: nil,
expectErr: nil,
expect: &logger.ExecutionResult{
Gas: params.TxGas,
Failed: false,
ReturnValue: "",
StructLogs: []logger.StructLogRes{},
},
},
}
for _, testspec := range testSuite {
result, err := api.TraceCall(context.Background(), testspec.call, rpc.BlockNumberOrHash{BlockNumber: &testspec.blockNumber}, testspec.config)
if testspec.expectErr != nil {
if err == nil {
t.Errorf("Expect error %v, get nothing", testspec.expectErr)
continue
}
if !reflect.DeepEqual(err, testspec.expectErr) {
t.Errorf("Error mismatch, want %v, get %v", testspec.expectErr, err)
}
} else {
if err != nil {
t.Errorf("Expect no error, get %v", err)
continue
}
var have *logger.ExecutionResult
if err := json.Unmarshal(result.(json.RawMessage), &have); err != nil {
t.Errorf("failed to unmarshal result %v", err)
}
if !reflect.DeepEqual(have, testspec.expect) {
t.Errorf("Result mismatch, want %v, get %v", testspec.expect, have)
}
}
}
}
func TestTraceTransaction(t *testing.T) {
t.Parallel()
// Initialize test accounts
accounts := newAccounts(2)
genesis := &core.Genesis{Alloc: core.GenesisAlloc{
accounts[0].addr: {Balance: big.NewInt(params.Ether)},
accounts[1].addr: {Balance: big.NewInt(params.Ether)},
}}
target := common.Hash{}
signer := types.HomesteadSigner{}
api := NewAPI(newTestBackend(t, 1, genesis, func(i int, b *core.BlockGen) {
// Transfer from account[0] to account[1]
// value: 1000 wei
// fee: 0 wei
tx, _ := types.SignTx(types.NewTransaction(uint64(i), accounts[1].addr, big.NewInt(1000), params.TxGas, b.BaseFee(), nil), signer, accounts[0].key)
b.AddTx(tx)
target = tx.Hash()
}))
result, err := api.TraceTransaction(context.Background(), target, nil)
if err != nil {
t.Errorf("Failed to trace transaction %v", err)
}
var have *logger.ExecutionResult
if err := json.Unmarshal(result.(json.RawMessage), &have); err != nil {
t.Errorf("failed to unmarshal result %v", err)
}
if !reflect.DeepEqual(have, &logger.ExecutionResult{
Gas: params.TxGas,
Failed: false,
ReturnValue: "",
StructLogs: []logger.StructLogRes{},
}) {
t.Error("Transaction tracing result is different")
}
}
func TestTraceBlock(t *testing.T) {
t.Parallel()
// Initialize test accounts
accounts := newAccounts(3)
genesis := &core.Genesis{Alloc: core.GenesisAlloc{
accounts[0].addr: {Balance: big.NewInt(params.Ether)},
accounts[1].addr: {Balance: big.NewInt(params.Ether)},
accounts[2].addr: {Balance: big.NewInt(params.Ether)},
}}
genBlocks := 10
signer := types.HomesteadSigner{}
api := NewAPI(newTestBackend(t, genBlocks, genesis, func(i int, b *core.BlockGen) {
// Transfer from account[0] to account[1]
// value: 1000 wei
// fee: 0 wei
tx, _ := types.SignTx(types.NewTransaction(uint64(i), accounts[1].addr, big.NewInt(1000), params.TxGas, b.BaseFee(), nil), signer, accounts[0].key)
b.AddTx(tx)
}))
var testSuite = []struct {
blockNumber rpc.BlockNumber
config *TraceConfig
want string
expectErr error
}{
// Trace genesis block, expect error
{
blockNumber: rpc.BlockNumber(0),
expectErr: errors.New("genesis is not traceable"),
},
// Trace head block
{
blockNumber: rpc.BlockNumber(genBlocks),
want: `[{"result":{"gas":21000,"failed":false,"returnValue":"","structLogs":[]}}]`,
},
// Trace non-existent block
{
blockNumber: rpc.BlockNumber(genBlocks + 1),
expectErr: fmt.Errorf("block #%d not found", genBlocks+1),
},
// Trace latest block
{
blockNumber: rpc.LatestBlockNumber,
want: `[{"result":{"gas":21000,"failed":false,"returnValue":"","structLogs":[]}}]`,
},
// Trace pending block
{
blockNumber: rpc.PendingBlockNumber,
want: `[{"result":{"gas":21000,"failed":false,"returnValue":"","structLogs":[]}}]`,
},
}
for i, tc := range testSuite {
result, err := api.TraceBlockByNumber(context.Background(), tc.blockNumber, tc.config)
if tc.expectErr != nil {
if err == nil {
t.Errorf("test %d, want error %v", i, tc.expectErr)
continue
}
if !reflect.DeepEqual(err, tc.expectErr) {
t.Errorf("test %d: error mismatch, want %v, get %v", i, tc.expectErr, err)
}
continue
}
if err != nil {
t.Errorf("test %d, want no error, have %v", i, err)
continue
}
have, _ := json.Marshal(result)
want := tc.want
if string(have) != want {
t.Errorf("test %d, result mismatch, have\n%v\n, want\n%v\n", i, string(have), want)
}
}
}
func TestTracingWithOverrides(t *testing.T) {
t.Parallel()
// Initialize test accounts
accounts := newAccounts(3)
genesis := &core.Genesis{Alloc: core.GenesisAlloc{
accounts[0].addr: {Balance: big.NewInt(params.Ether)},
accounts[1].addr: {Balance: big.NewInt(params.Ether)},
accounts[2].addr: {Balance: big.NewInt(params.Ether)},
}}
genBlocks := 10
signer := types.HomesteadSigner{}
api := NewAPI(newTestBackend(t, genBlocks, genesis, func(i int, b *core.BlockGen) {
// Transfer from account[0] to account[1]
// value: 1000 wei
// fee: 0 wei
tx, _ := types.SignTx(types.NewTransaction(uint64(i), accounts[1].addr, big.NewInt(1000), params.TxGas, b.BaseFee(), nil), signer, accounts[0].key)
b.AddTx(tx)
}))
randomAccounts := newAccounts(3)
type res struct {
Gas int
Failed bool
returnValue string
}
var testSuite = []struct {
blockNumber rpc.BlockNumber
call ethapi.TransactionArgs
config *TraceCallConfig
expectErr error
want string
}{
// Call which can only succeed if state is state overridden
{
blockNumber: rpc.PendingBlockNumber,
call: ethapi.TransactionArgs{
From: &randomAccounts[0].addr,
To: &randomAccounts[1].addr,
Value: (*hexutil.Big)(big.NewInt(1000)),
},
config: &TraceCallConfig{
StateOverrides: &ethapi.StateOverride{
randomAccounts[0].addr: ethapi.OverrideAccount{Balance: newRPCBalance(new(big.Int).Mul(big.NewInt(1), big.NewInt(params.Ether)))},
},
},
want: `{"gas":21000,"failed":false,"returnValue":""}`,
},
// Invalid call without state overriding
{
blockNumber: rpc.PendingBlockNumber,
call: ethapi.TransactionArgs{
From: &randomAccounts[0].addr,
To: &randomAccounts[1].addr,
Value: (*hexutil.Big)(big.NewInt(1000)),
},
config: &TraceCallConfig{},
expectErr: core.ErrInsufficientFunds,
},
// Successful simple contract call
//
// // SPDX-License-Identifier: GPL-3.0
//
// pragma solidity >=0.7.0 <0.8.0;
//
// /**
// * @title Storage
// * @dev Store & retrieve value in a variable
// */
// contract Storage {
// uint256 public number;
// constructor() {
// number = block.number;
// }
// }
{
blockNumber: rpc.PendingBlockNumber,
call: ethapi.TransactionArgs{
From: &randomAccounts[0].addr,
To: &randomAccounts[2].addr,
Data: newRPCBytes(common.Hex2Bytes("8381f58a")), // call number()
},
config: &TraceCallConfig{
//Tracer: &tracer,
StateOverrides: &ethapi.StateOverride{
randomAccounts[2].addr: ethapi.OverrideAccount{
Code: newRPCBytes(common.Hex2Bytes("6080604052348015600f57600080fd5b506004361060285760003560e01c80638381f58a14602d575b600080fd5b60336049565b6040518082815260200191505060405180910390f35b6000548156fea2646970667358221220eab35ffa6ab2adfe380772a48b8ba78e82a1b820a18fcb6f59aa4efb20a5f60064736f6c63430007040033")),
StateDiff: newStates([]common.Hash{{}}, []common.Hash{common.BigToHash(big.NewInt(123))}),
},
},
},
want: `{"gas":23347,"failed":false,"returnValue":"000000000000000000000000000000000000000000000000000000000000007b"}`,
},
}
for i, tc := range testSuite {
result, err := api.TraceCall(context.Background(), tc.call, rpc.BlockNumberOrHash{BlockNumber: &tc.blockNumber}, tc.config)
if tc.expectErr != nil {
if err == nil {
t.Errorf("test %d: want error %v, have nothing", i, tc.expectErr)
continue
}
if !errors.Is(err, tc.expectErr) {
t.Errorf("test %d: error mismatch, want %v, have %v", i, tc.expectErr, err)
}
continue
}
if err != nil {
t.Errorf("test %d: want no error, have %v", i, err)
continue
}
// Turn result into res-struct
var (
have res
want res
)
resBytes, _ := json.Marshal(result)
json.Unmarshal(resBytes, &have)
json.Unmarshal([]byte(tc.want), &want)
if !reflect.DeepEqual(have, want) {
t.Errorf("test %d, result mismatch, have\n%v\n, want\n%v\n", i, string(resBytes), want)
}
}
}
type Account struct {
key *ecdsa.PrivateKey
addr common.Address
}
type Accounts []Account
func (a Accounts) Len() int { return len(a) }
func (a Accounts) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a Accounts) Less(i, j int) bool { return bytes.Compare(a[i].addr.Bytes(), a[j].addr.Bytes()) < 0 }
func newAccounts(n int) (accounts Accounts) {
for i := 0; i < n; i++ {
key, _ := crypto.GenerateKey()
addr := crypto.PubkeyToAddress(key.PublicKey)
accounts = append(accounts, Account{key: key, addr: addr})
}
sort.Sort(accounts)
return accounts
}
func newRPCBalance(balance *big.Int) **hexutil.Big {
rpcBalance := (*hexutil.Big)(balance)
return &rpcBalance
}
func newRPCBytes(bytes []byte) *hexutil.Bytes {
rpcBytes := hexutil.Bytes(bytes)
return &rpcBytes
}
func newStates(keys []common.Hash, vals []common.Hash) *map[common.Hash]common.Hash {
if len(keys) != len(vals) {
panic("invalid input")
}
m := make(map[common.Hash]common.Hash)
for i := 0; i < len(keys); i++ {
m[keys[i]] = vals[i]
}
return &m
}