/
prestate_test.go
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/
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/rlp"
"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,omitempty"`
Nonce uint64 `json:"nonce,omitempty"`
Code string `json:"code,omitempty"`
Storage map[common.Hash]common.Hash `json:"storage,omitempty"`
}
type prePostStateTrace struct {
Pre prestateTrace `json:"pre"`
Post prestateTrace `json:"post"`
}
// prestateTraceTest defines a single test to check the stateDiff tracer against.
type prestateTraceTest struct {
Genesis *core.Genesis `json:"genesis"`
Context *callContext `json:"context"`
Input string `json:"input"`
TracerConfig json.RawMessage `json:"tracerConfig"`
Result interface{} `json:"result"`
}
func TestPrestateTracer(t *testing.T) {
testPrestateDiffTracer("prestateTracer", "prestate_tracer", t, func() interface{} { return new(prestateTrace) })
}
func TestPrestateWithDiffModeTracer(t *testing.T) {
testPrestateDiffTracer("prestateTracer", "prestate_tracer_with_diff_mode", t, func() interface{} { return new(prePostStateTrace) })
}
func testPrestateDiffTracer(tracerName string, dirPath string, t *testing.T, typeBuilder func() interface{}) {
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(prestateTraceTest)
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 := rlp.DecodeBytes(common.FromHex(test.Input), tx); 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)))
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: new(big.Int).SetUint64(uint64(test.Context.Time)),
Difficulty: (*big.Int)(test.Context.Difficulty),
GasLimit: uint64(test.Context.GasLimit),
}
_, statedb = tests.MakePreState(rawdb.NewMemoryDatabase(), test.Genesis.Alloc, false)
)
tracer, err := tracers.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{Debug: true, Tracer: tracer})
msg, err := tx.AsMessage(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)
}
ret := typeBuilder()
if err := json.Unmarshal(res, ret); err != nil {
t.Fatalf("failed to unmarshal trace result: %v", err)
}
if !jsonEqual(ret, test.Result, typeBuilder(), typeBuilder()) {
// uncomment this for easier debugging
// have, _ := json.MarshalIndent(ret, "", " ")
// want, _ := json.MarshalIndent(test.Result, "", " ")
// t.Fatalf("trace mismatch: \nhave %+v\nwant %+v", string(have), string(want))
t.Fatalf("trace mismatch: \nhave %+v\nwant %+v", ret, test.Result)
}
})
}
}