Official Go implementation of the Ethereum protocol
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go-ethereum/eth/tracers/internal/tracetest/prestate_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 tracetest
import (
"encoding/json"
"math/big"
"os"
"path/filepath"
"strings"
"testing"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/eth/tracers"
"github.com/ethereum/go-ethereum/tests"
)
// prestateTrace is the result of a prestateTrace run.
type prestateTrace = map[common.Address]*account
type account struct {
Balance string `json:"balance"`
Code string `json:"code"`
Nonce uint64 `json:"nonce"`
Storage map[common.Hash]common.Hash `json:"storage"`
}
// testcase defines a single test to check the stateDiff tracer against.
type testcase struct {
Genesis *core.Genesis `json:"genesis"`
Context *callContext `json:"context"`
Input string `json:"input"`
TracerConfig json.RawMessage `json:"tracerConfig"`
Result interface{} `json:"result"`
}
func TestPrestateTracerLegacy(t *testing.T) {
testPrestateDiffTracer("prestateTracerLegacy", "prestate_tracer_legacy", t)
}
func TestPrestateTracer(t *testing.T) {
testPrestateDiffTracer("prestateTracer", "prestate_tracer", t)
}
func TestPrestateWithDiffModeTracer(t *testing.T) {
testPrestateDiffTracer("prestateTracer", "prestate_tracer_with_diff_mode", t)
}
func testPrestateDiffTracer(tracerName string, dirPath string, t *testing.T) {
files, err := os.ReadDir(filepath.Join("testdata", dirPath))
if err != nil {
t.Fatalf("failed to retrieve tracer test suite: %v", err)
}
for _, file := range files {
if !strings.HasSuffix(file.Name(), ".json") {
continue
}
file := file // capture range variable
t.Run(camel(strings.TrimSuffix(file.Name(), ".json")), func(t *testing.T) {
t.Parallel()
var (
test = new(testcase)
tx = new(types.Transaction)
)
// Call tracer test found, read if from disk
if blob, err := os.ReadFile(filepath.Join("testdata", dirPath, file.Name())); err != nil {
t.Fatalf("failed to read testcase: %v", err)
} else if err := json.Unmarshal(blob, test); err != nil {
t.Fatalf("failed to parse testcase: %v", err)
}
if err := tx.UnmarshalBinary(common.FromHex(test.Input)); err != nil {
t.Fatalf("failed to parse testcase input: %v", err)
}
// Configure a blockchain with the given prestate
var (
signer = types.MakeSigner(test.Genesis.Config, new(big.Int).SetUint64(uint64(test.Context.Number)), uint64(test.Context.Time))
origin, _ = signer.Sender(tx)
txContext = vm.TxContext{
Origin: origin,
GasPrice: tx.GasPrice(),
}
context = vm.BlockContext{
CanTransfer: core.CanTransfer,
Transfer: core.Transfer,
Coinbase: test.Context.Miner,
BlockNumber: new(big.Int).SetUint64(uint64(test.Context.Number)),
Time: uint64(test.Context.Time),
Difficulty: (*big.Int)(test.Context.Difficulty),
GasLimit: uint64(test.Context.GasLimit),
BaseFee: test.Genesis.BaseFee,
}
triedb, _, statedb = tests.MakePreState(rawdb.NewMemoryDatabase(), test.Genesis.Alloc, false, rawdb.HashScheme)
)
defer triedb.Close()
tracer, err := tracers.DefaultDirectory.New(tracerName, new(tracers.Context), test.TracerConfig)
if err != nil {
t.Fatalf("failed to create call tracer: %v", err)
}
evm := vm.NewEVM(context, txContext, statedb, test.Genesis.Config, vm.Config{Tracer: tracer})
msg, err := core.TransactionToMessage(tx, signer, nil)
if err != nil {
t.Fatalf("failed to prepare transaction for tracing: %v", err)
}
st := core.NewStateTransition(evm, msg, new(core.GasPool).AddGas(tx.Gas()))
if _, err = st.TransitionDb(); err != nil {
t.Fatalf("failed to execute transaction: %v", err)
}
// Retrieve the trace result and compare against the expected
res, err := tracer.GetResult()
if err != nil {
t.Fatalf("failed to retrieve trace result: %v", err)
}
// The legacy javascript calltracer marshals json in js, which
// is not deterministic (as opposed to the golang json encoder).
if strings.HasSuffix(dirPath, "_legacy") {
// This is a tweak to make it deterministic. Can be removed when
// we remove the legacy tracer.
var x prestateTrace
json.Unmarshal(res, &x)
res, _ = json.Marshal(x)
}
want, err := json.Marshal(test.Result)
if err != nil {
t.Fatalf("failed to marshal test: %v", err)
}
if string(want) != string(res) {
t.Fatalf("trace mismatch\n have: %v\n want: %v\n", string(res), string(want))
}
})
}
}