194 lines
6.7 KiB
Go
194 lines
6.7 KiB
Go
// Copyright 2017 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 tracers
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import (
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"encoding/json"
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"io/ioutil"
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"math/big"
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"path/filepath"
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"reflect"
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"strings"
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"testing"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/ethereum/go-ethereum/common/math"
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"github.com/ethereum/go-ethereum/core"
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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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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/ethereum/go-ethereum/tests"
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)
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// To generate a new callTracer test, copy paste the makeTest method below into
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// a Geth console and call it with a transaction hash you which to export.
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/*
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// makeTest generates a callTracer test by running a prestate reassembled and a
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// call trace run, assembling all the gathered information into a test case.
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var makeTest = function(tx, rewind) {
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// Generate the genesis block from the block, transaction and prestate data
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var block = eth.getBlock(eth.getTransaction(tx).blockHash);
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var genesis = eth.getBlock(block.parentHash);
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delete genesis.gasUsed;
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delete genesis.logsBloom;
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delete genesis.parentHash;
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delete genesis.receiptsRoot;
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delete genesis.sha3Uncles;
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delete genesis.size;
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delete genesis.transactions;
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delete genesis.transactionsRoot;
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delete genesis.uncles;
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genesis.gasLimit = genesis.gasLimit.toString();
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genesis.number = genesis.number.toString();
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genesis.timestamp = genesis.timestamp.toString();
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genesis.alloc = debug.traceTransaction(tx, {tracer: "prestateTracer", rewind: rewind});
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for (var key in genesis.alloc) {
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genesis.alloc[key].nonce = genesis.alloc[key].nonce.toString();
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}
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genesis.config = admin.nodeInfo.protocols.eth.config;
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// Generate the call trace and produce the test input
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var result = debug.traceTransaction(tx, {tracer: "callTracer", rewind: rewind});
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delete result.time;
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console.log(JSON.stringify({
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genesis: genesis,
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context: {
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number: block.number.toString(),
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difficulty: block.difficulty,
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timestamp: block.timestamp.toString(),
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gasLimit: block.gasLimit.toString(),
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miner: block.miner,
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},
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input: eth.getRawTransaction(tx),
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result: result,
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}, null, 2));
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}
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*/
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// callTrace is the result of a callTracer run.
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type callTrace struct {
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Type string `json:"type"`
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From common.Address `json:"from"`
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To common.Address `json:"to"`
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Input hexutil.Bytes `json:"input"`
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Output hexutil.Bytes `json:"output"`
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Gas *hexutil.Uint64 `json:"gas,omitempty"`
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GasUsed *hexutil.Uint64 `json:"gasUsed,omitempty"`
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Value *hexutil.Big `json:"value,omitempty"`
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Error string `json:"error,omitempty"`
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Calls []callTrace `json:"calls,omitempty"`
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}
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type callContext struct {
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Number math.HexOrDecimal64 `json:"number"`
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Difficulty *math.HexOrDecimal256 `json:"difficulty"`
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Time math.HexOrDecimal64 `json:"timestamp"`
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GasLimit math.HexOrDecimal64 `json:"gasLimit"`
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Miner common.Address `json:"miner"`
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}
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// callTracerTest defines a single test to check the call tracer against.
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type callTracerTest struct {
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Genesis *core.Genesis `json:"genesis"`
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Context *callContext `json:"context"`
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Input string `json:"input"`
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Result *callTrace `json:"result"`
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}
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// Iterates over all the input-output datasets in the tracer test harness and
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// runs the JavaScript tracers against them.
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func TestCallTracer(t *testing.T) {
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files, err := ioutil.ReadDir("testdata")
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if err != nil {
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t.Fatalf("failed to retrieve tracer test suite: %v", err)
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}
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for _, file := range files {
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if !strings.HasPrefix(file.Name(), "call_tracer_") {
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continue
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}
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file := file // capture range variable
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t.Run(camel(strings.TrimSuffix(strings.TrimPrefix(file.Name(), "call_tracer_"), ".json")), func(t *testing.T) {
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t.Parallel()
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// Call tracer test found, read if from disk
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blob, err := ioutil.ReadFile(filepath.Join("testdata", file.Name()))
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if err != nil {
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t.Fatalf("failed to read testcase: %v", err)
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}
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test := new(callTracerTest)
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if err := json.Unmarshal(blob, test); err != nil {
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t.Fatalf("failed to parse testcase: %v", err)
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}
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// Configure a blockchain with the given prestate
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tx := new(types.Transaction)
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if err := rlp.DecodeBytes(common.FromHex(test.Input), tx); err != nil {
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t.Fatalf("failed to parse testcase input: %v", err)
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}
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signer := types.MakeSigner(test.Genesis.Config, new(big.Int).SetUint64(uint64(test.Context.Number)))
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origin, _ := signer.Sender(tx)
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context := vm.Context{
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CanTransfer: core.CanTransfer,
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Transfer: core.Transfer,
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Origin: origin,
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Coinbase: test.Context.Miner,
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BlockNumber: new(big.Int).SetUint64(uint64(test.Context.Number)),
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Time: new(big.Int).SetUint64(uint64(test.Context.Time)),
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Difficulty: (*big.Int)(test.Context.Difficulty),
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GasLimit: uint64(test.Context.GasLimit),
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GasPrice: tx.GasPrice(),
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}
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statedb := tests.MakePreState(ethdb.NewMemDatabase(), test.Genesis.Alloc)
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// Create the tracer, the EVM environment and run it
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tracer, err := New("callTracer")
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if err != nil {
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t.Fatalf("failed to create call tracer: %v", err)
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}
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evm := vm.NewEVM(context, statedb, test.Genesis.Config, vm.Config{Debug: true, Tracer: tracer})
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msg, err := tx.AsMessage(signer)
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if err != nil {
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t.Fatalf("failed to prepare transaction for tracing: %v", err)
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}
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st := core.NewStateTransition(evm, msg, new(core.GasPool).AddGas(tx.Gas()))
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if _, _, _, err = st.TransitionDb(); err != nil {
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t.Fatalf("failed to execute transaction: %v", err)
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}
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// Retrieve the trace result and compare against the etalon
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res, err := tracer.GetResult()
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if err != nil {
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t.Fatalf("failed to retrieve trace result: %v", err)
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}
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ret := new(callTrace)
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if err := json.Unmarshal(res, ret); err != nil {
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t.Fatalf("failed to unmarshal trace result: %v", err)
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}
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if !reflect.DeepEqual(ret, test.Result) {
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t.Fatalf("trace mismatch: have %+v, want %+v", ret, test.Result)
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}
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})
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}
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}
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